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SubjectRe: [PATCH] iio: adc: Move mxs-lradc out of staging
From
Date
On 06/02/16 22:23, Ksenija Stanojevic wrote:
> Move mxs-lradc driver from drivers/staging/iio/adc to drivers/iio/adc.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Given the input elements in here, cc'ing linux-input and Dmitry.

Will probably be the weekend before I get a chance to look at this.

Jonathan
> ---
> drivers/iio/adc/Kconfig | 14 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/mxs-lradc.c | 1770 +++++++++++++++++++++++++++++++++++
> drivers/staging/iio/adc/Kconfig | 14 -
> drivers/staging/iio/adc/Makefile | 1 -
> drivers/staging/iio/adc/mxs-lradc.c | 1770 -----------------------------------
> 6 files changed, 1785 insertions(+), 1785 deletions(-)
> create mode 100644 drivers/iio/adc/mxs-lradc.c
> delete mode 100644 drivers/staging/iio/adc/mxs-lradc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 60673b4..4900b0a 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -295,6 +295,20 @@ config MEN_Z188_ADC
> This driver can also be built as a module. If so, the module will be
> called men_z188_adc.
>
> +config MXS_LRADC
> + tristate "Freescale i.MX23/i.MX28 LRADC"
> + depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
> + depends on INPUT
> + select STMP_DEVICE
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say yes here to build support for i.MX23/i.MX28 LRADC convertor
> + built into these chips.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called mxs-lradc.
> +
> config NAU7802
> tristate "Nuvoton NAU7802 ADC driver"
> depends on I2C
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index fb57e12..3b14f30 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_MAX1363) += max1363.o
> obj-$(CONFIG_MCP320X) += mcp320x.o
> obj-$(CONFIG_MCP3422) += mcp3422.o
> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
> +obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_NAU7802) += nau7802.o
> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
> obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
> diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
> new file mode 100644
> index 0000000..bb1f152
> --- /dev/null
> +++ b/drivers/iio/adc/mxs-lradc.c
> @@ -0,0 +1,1770 @@
> +/*
> + * Freescale MXS LRADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/stmp_device.h>
> +#include <linux/sysfs.h>
> +
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define DRIVER_NAME "mxs-lradc"
> +
> +#define LRADC_MAX_DELAY_CHANS 4
> +#define LRADC_MAX_MAPPED_CHANS 8
> +#define LRADC_MAX_TOTAL_CHANS 16
> +
> +#define LRADC_DELAY_TIMER_HZ 2000
> +
> +/*
> + * Make this runtime configurable if necessary. Currently, if the buffered mode
> + * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> + * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> + * seconds. The result is that the samples arrive every 500mS.
> + */
> +#define LRADC_DELAY_TIMER_PER 200
> +#define LRADC_DELAY_TIMER_LOOP 5
> +
> +/*
> + * Once the pen touches the touchscreen, the touchscreen switches from
> + * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
> + * is realized by worker thread, which is called every 20 or so milliseconds.
> + * This gives the touchscreen enough fluency and does not strain the system
> + * too much.
> + */
> +#define LRADC_TS_SAMPLE_DELAY_MS 5
> +
> +/*
> + * The LRADC reads the following amount of samples from each touchscreen
> + * channel and the driver then computes average of these.
> + */
> +#define LRADC_TS_SAMPLE_AMOUNT 4
> +
> +enum mxs_lradc_id {
> + IMX23_LRADC,
> + IMX28_LRADC,
> +};
> +
> +static const char * const mx23_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> +};
> +
> +static const char * const mx28_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-thresh0",
> + "mxs-lradc-thresh1",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> + "mxs-lradc-button0",
> + "mxs-lradc-button1",
> +};
> +
> +struct mxs_lradc_of_config {
> + const int irq_count;
> + const char * const *irq_name;
> + const u32 *vref_mv;
> +};
> +
> +#define VREF_MV_BASE 1850
> +
> +static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE * 2, /* CH6 VDDIO */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE, /* CH10 */
> + VREF_MV_BASE, /* CH11 */
> + VREF_MV_BASE, /* CH12 USB_DP */
> + VREF_MV_BASE, /* CH13 USB_DN */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> +};
> +
> +static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE, /* CH6 */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE * 2, /* CH10 VDDIO */
> + VREF_MV_BASE, /* CH11 VTH */
> + VREF_MV_BASE * 2, /* CH12 VDDA */
> + VREF_MV_BASE, /* CH13 VDDD */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> +};
> +
> +static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> + [IMX23_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> + .irq_name = mx23_lradc_irq_names,
> + .vref_mv = mx23_vref_mv,
> + },
> + [IMX28_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> + .irq_name = mx28_lradc_irq_names,
> + .vref_mv = mx28_vref_mv,
> + },
> +};
> +
> +enum mxs_lradc_ts {
> + MXS_LRADC_TOUCHSCREEN_NONE = 0,
> + MXS_LRADC_TOUCHSCREEN_4WIRE,
> + MXS_LRADC_TOUCHSCREEN_5WIRE,
> +};
> +
> +/*
> + * Touchscreen handling
> + */
> +enum lradc_ts_plate {
> + LRADC_TOUCH = 0,
> + LRADC_SAMPLE_X,
> + LRADC_SAMPLE_Y,
> + LRADC_SAMPLE_PRESSURE,
> + LRADC_SAMPLE_VALID,
> +};
> +
> +enum mxs_lradc_divbytwo {
> + MXS_LRADC_DIV_DISABLED = 0,
> + MXS_LRADC_DIV_ENABLED,
> +};
> +
> +struct mxs_lradc_scale {
> + unsigned int integer;
> + unsigned int nano;
> +};
> +
> +struct mxs_lradc {
> + struct device *dev;
> + void __iomem *base;
> + int irq[13];
> +
> + struct clk *clk;
> +
> + u32 *buffer;
> + struct iio_trigger *trig;
> +
> + struct mutex lock;
> +
> + struct completion completion;
> +
> + const u32 *vref_mv;
> + struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> + unsigned long is_divided;
> +
> + /*
> + * When the touchscreen is enabled, we give it two private virtual
> + * channels: #6 and #7. This means that only 6 virtual channels (instead
> + * of 8) will be available for buffered capture.
> + */
> +#define TOUCHSCREEN_VCHANNEL1 7
> +#define TOUCHSCREEN_VCHANNEL2 6
> +#define BUFFER_VCHANS_LIMITED 0x3f
> +#define BUFFER_VCHANS_ALL 0xff
> + u8 buffer_vchans;
> +
> + /*
> + * Furthermore, certain LRADC channels are shared between touchscreen
> + * and/or touch-buttons and generic LRADC block. Therefore when using
> + * either of these, these channels are not available for the regular
> + * sampling. The shared channels are as follows:
> + *
> + * CH0 -- Touch button #0
> + * CH1 -- Touch button #1
> + * CH2 -- Touch screen XPUL
> + * CH3 -- Touch screen YPLL
> + * CH4 -- Touch screen XNUL
> + * CH5 -- Touch screen YNLR
> + * CH6 -- Touch screen WIPER (5-wire only)
> + *
> + * The bit fields below represents which parts of the LRADC block are
> + * switched into special mode of operation. These channels can not
> + * be sampled as regular LRADC channels. The driver will refuse any
> + * attempt to sample these channels.
> + */
> +#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> +#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> +#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> + enum mxs_lradc_ts use_touchscreen;
> + bool use_touchbutton;
> +
> + struct input_dev *ts_input;
> +
> + enum mxs_lradc_id soc;
> + enum lradc_ts_plate cur_plate; /* state machine */
> + bool ts_valid;
> + unsigned ts_x_pos;
> + unsigned ts_y_pos;
> + unsigned ts_pressure;
> +
> + /* handle touchscreen's physical behaviour */
> + /* samples per coordinate */
> + unsigned over_sample_cnt;
> + /* time clocks between samples */
> + unsigned over_sample_delay;
> + /* time in clocks to wait after the plates where switched */
> + unsigned settling_delay;
> +};
> +
> +#define LRADC_CTRL0 0x00
> +# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> +# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> +# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> +# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> +# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> +# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> +# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> +# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> +
> +# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> +# define LRADC_CTRL0_MX23_YM BIT(19)
> +# define LRADC_CTRL0_MX23_XM BIT(18)
> +# define LRADC_CTRL0_MX23_YP BIT(17)
> +# define LRADC_CTRL0_MX23_XP BIT(16)
> +
> +# define LRADC_CTRL0_MX28_PLATE_MASK \
> + (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> + LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> + LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> +
> +# define LRADC_CTRL0_MX23_PLATE_MASK \
> + (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> + LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> +
> +#define LRADC_CTRL1 0x10
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> +#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> +#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> +#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> +
> +#define LRADC_CTRL2 0x20
> +#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> +#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> +
> +#define LRADC_STATUS 0x40
> +#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> +
> +#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> +#define LRADC_CH_ACCUMULATE BIT(29)
> +#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> +#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> +#define LRADC_CH_NUM_SAMPLES(x) \
> + ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> +#define LRADC_CH_VALUE_MASK 0x3ffff
> +#define LRADC_CH_VALUE_OFFSET 0
> +
> +#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> +#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> +#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> +#define LRADC_DELAY_TRIGGER(x) \
> + (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_LRADCS_MASK)
> +#define LRADC_DELAY_KICK BIT(20)
> +#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> +#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> +#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> + (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_DELAYS_MASK)
> +#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> +#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> +#define LRADC_DELAY_LOOP(x) \
> + (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> + LRADC_DELAY_LOOP_COUNT_MASK)
> +#define LRADC_DELAY_DELAY_MASK 0x7ff
> +#define LRADC_DELAY_DELAY_OFFSET 0
> +#define LRADC_DELAY_DELAY(x) \
> + (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> + LRADC_DELAY_DELAY_MASK)
> +
> +#define LRADC_CTRL4 0x140
> +#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> +#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> +#define LRADC_CTRL4_LRADCSELECT(n, x) \
> + (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> + LRADC_CTRL4_LRADCSELECT_MASK(n))
> +
> +#define LRADC_RESOLUTION 12
> +#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> +
> +static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> +}
> +
> +static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> +}
> +
> +static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg);
> +}
> +
> +static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_PLATE_MASK;
> + return LRADC_CTRL0_MX28_PLATE_MASK;
> +}
> +
> +static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
> + return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
> +}
> +
> +static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> + return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> +}
> +
> +static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
> + return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
> +}
> +
> +static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
> + return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
> +}
> +
> +static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
> + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
> +}
> +
> +static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
> +{
> + if (lradc->soc == IMX23_LRADC)
> + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
> + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
> +}
> +
> +static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
> +{
> + return !!(readl(lradc->base + LRADC_STATUS) &
> + LRADC_STATUS_TOUCH_DETECT_RAW);
> +}
> +
> +static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
> + unsigned ch)
> +{
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
> + LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
> +}
> +
> +static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
> +{
> + /*
> + * prepare for oversampling conversion
> + *
> + * from the datasheet:
> + * "The ACCUMULATE bit in the appropriate channel register
> + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> + * otherwise, the IRQs will not fire."
> + */
> + mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
> + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
> + LRADC_CH(ch));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
> +
> + /*
> + * prepare the delay/loop unit according to the oversampling count
> + *
> + * from the datasheet:
> + * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
> + * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
> + * the LRADC will not trigger the delay group."
> + */
> + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
> + LRADC_DELAY_TRIGGER_DELAYS(0) |
> + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> + LRADC_DELAY(3));
> +
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
> +
> + /*
> + * after changing the touchscreen plates setting
> + * the signals need some initial time to settle. Start the
> + * SoC's delay unit and start the conversion later
> + * and automatically.
> + */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> + LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> + LRADC_DELAY_KICK |
> + LRADC_DELAY_DELAY(lradc->settling_delay),
> + LRADC_DELAY(2));
> +}
> +
> +/*
> + * Pressure detection is special:
> + * We want to do both required measurements for the pressure detection in
> + * one turn. Use the hardware features to chain both conversions and let the
> + * hardware report one interrupt if both conversions are done
> + */
> +static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
> + unsigned ch2)
> +{
> + u32 reg;
> +
> + /*
> + * prepare for oversampling conversion
> + *
> + * from the datasheet:
> + * "The ACCUMULATE bit in the appropriate channel register
> + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> + * otherwise, the IRQs will not fire."
> + */
> + reg = LRADC_CH_ACCUMULATE |
> + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
> + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
> + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
> + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
> +
> + /* prepare the delay/loop unit according to the oversampling count */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(1 << ch1) |
> + LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
> + LRADC_DELAY_TRIGGER_DELAYS(0) |
> + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> + LRADC_DELAY(3));
> +
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
> +
> + /*
> + * after changing the touchscreen plates setting
> + * the signals need some initial time to settle. Start the
> + * SoC's delay unit and start the conversion later
> + * and automatically.
> + */
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> + LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> + LRADC_DELAY_KICK |
> + LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
> +}
> +
> +static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
> + unsigned channel)
> +{
> + u32 reg;
> + unsigned num_samples, val;
> +
> + reg = readl(lradc->base + LRADC_CH(channel));
> + if (reg & LRADC_CH_ACCUMULATE)
> + num_samples = lradc->over_sample_cnt;
> + else
> + num_samples = 1;
> +
> + val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
> + return val / num_samples;
> +}
> +
> +static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
> + unsigned ch1, unsigned ch2)
> +{
> + u32 reg, mask;
> + unsigned pressure, m1, m2;
> +
> + mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> + reg = readl(lradc->base + LRADC_CTRL1) & mask;
> +
> + while (reg != mask) {
> + reg = readl(lradc->base + LRADC_CTRL1) & mask;
> + dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
> + }
> +
> + m1 = mxs_lradc_read_raw_channel(lradc, ch1);
> + m2 = mxs_lradc_read_raw_channel(lradc, ch2);
> +
> + if (m2 == 0) {
> + dev_warn(lradc->dev, "Cannot calculate pressure\n");
> + return 1 << (LRADC_RESOLUTION - 1);
> + }
> +
> + /* simply scale the value from 0 ... max ADC resolution */
> + pressure = m1;
> + pressure *= (1 << LRADC_RESOLUTION);
> + pressure /= m2;
> +
> + dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
> + return pressure;
> +}
> +
> +#define TS_CH_XP 2
> +#define TS_CH_YP 3
> +#define TS_CH_XM 4
> +#define TS_CH_YM 5
> +
> +/*
> + * YP(open)--+-------------+
> + * | |--+
> + * | | |
> + * YM(-)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(weak+) XM(open)
> + *
> + * "weak+" means 200k Ohm VDDIO
> + * (-) means GND
> + */
> +static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
> +{
> + /*
> + * In order to detect a touch event the 'touch detect enable' bit
> + * enables:
> + * - a weak pullup to the X+ connector
> + * - a strong ground at the Y- connector
> + */
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
> + LRADC_CTRL0);
> +}
> +
> +/*
> + * YP(meas)--+-------------+
> + * | |--+
> + * | | |
> + * YM(open)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(+) XM(-)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_X;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
> + mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +/*
> + * YP(+)--+-------------+
> + * | |--+
> + * | | |
> + * YM(-)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(open) XM(meas)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_Y;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
> + mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +/*
> + * YP(+)--+-------------+
> + * | |--+
> + * | | |
> + * YM(meas)--+-------------+ |
> + * +--------------+
> + * | |
> + * XP(meas) XM(-)
> + *
> + * (+) means here 1.85 V
> + * (-) means here GND
> + */
> +static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> + mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
> +
> + lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> + mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
> + mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
> + TOUCHSCREEN_VCHANNEL1);
> +}
> +
> +static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_setup_touch_detection(lradc);
> +
> + lradc->cur_plate = LRADC_TOUCH;
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> +}
> +
> +static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc,
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> + LRADC_CTRL1);
> + /*
> + * start with the Y-pos, because it uses nearly the same plate
> + * settings like the touch detection
> + */
> + mxs_lradc_prepare_y_pos(lradc);
> +}
> +
> +static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
> +{
> + input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
> + input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
> + input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
> + input_report_key(lradc->ts_input, BTN_TOUCH, 1);
> + input_sync(lradc->ts_input);
> +}
> +
> +static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
> +{
> + mxs_lradc_setup_touch_detection(lradc);
> + lradc->cur_plate = LRADC_SAMPLE_VALID;
> + /*
> + * start a dummy conversion to burn time to settle the signals
> + * note: we are not interested in the conversion's value
> + */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> + LRADC_CTRL1);
> + mxs_lradc_reg_wrt(
> + lradc,
> + LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
> + LRADC_DELAY(2));
> +}
> +
> +/*
> + * in order to avoid false measurements, report only samples where
> + * the surface is still touched after the position measurement
> + */
> +static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
> +{
> + /* if it is still touched, report the sample */
> + if (valid && mxs_lradc_check_touch_event(lradc)) {
> + lradc->ts_valid = true;
> + mxs_lradc_report_ts_event(lradc);
> + }
> +
> + /* if it is even still touched, continue with the next measurement */
> + if (mxs_lradc_check_touch_event(lradc)) {
> + mxs_lradc_prepare_y_pos(lradc);
> + return;
> + }
> +
> + if (lradc->ts_valid) {
> + /* signal the release */
> + lradc->ts_valid = false;
> + input_report_key(lradc->ts_input, BTN_TOUCH, 0);
> + input_sync(lradc->ts_input);
> + }
> +
> + /* if it is released, wait for the next touch via IRQ */
> + lradc->cur_plate = LRADC_TOUCH;
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> + mxs_lradc_reg_clear(lradc,
> + LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> + LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> +}
> +
> +/* touchscreen's state machine */
> +static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
> +{
> + switch (lradc->cur_plate) {
> + case LRADC_TOUCH:
> + if (mxs_lradc_check_touch_event(lradc))
> + mxs_lradc_start_touch_event(lradc);
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
> + LRADC_CTRL1);
> + return;
> +
> + case LRADC_SAMPLE_Y:
> + lradc->ts_y_pos =
> + mxs_lradc_read_raw_channel(lradc,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_prepare_x_pos(lradc);
> + return;
> +
> + case LRADC_SAMPLE_X:
> + lradc->ts_x_pos =
> + mxs_lradc_read_raw_channel(lradc,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_prepare_pressure(lradc);
> + return;
> +
> + case LRADC_SAMPLE_PRESSURE:
> + lradc->ts_pressure =
> + mxs_lradc_read_ts_pressure(lradc,
> + TOUCHSCREEN_VCHANNEL2,
> + TOUCHSCREEN_VCHANNEL1);
> + mxs_lradc_complete_touch_event(lradc);
> + return;
> +
> + case LRADC_SAMPLE_VALID:
> + mxs_lradc_finish_touch_event(lradc, 1);
> + break;
> + }
> +}
> +
> +/*
> + * Raw I/O operations
> + */
> +static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> + int ret;
> +
> + /*
> + * See if there is no buffered operation in progress. If there is, simply
> + * bail out. This can be improved to support both buffered and raw IO at
> + * the same time, yet the code becomes horribly complicated. Therefore I
> + * applied KISS principle here.
> + */
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + reinit_completion(&lradc->completion);
> +
> + /*
> + * No buffered operation in progress, map the channel and trigger it.
> + * Virtual channel 0 is always used here as the others are always not
> + * used if doing raw sampling.
> + */
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> +
> + /* Enable / disable the divider per requirement */
> + if (test_bit(chan, &lradc->is_divided))
> + mxs_lradc_reg_set(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> + else
> + mxs_lradc_reg_clear(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> +
> + /* Clean the slot's previous content, then set new one. */
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> + LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> +
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> +
> + /* Enable the IRQ and start sampling the channel. */
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> +
> + /* Wait for completion on the channel, 1 second max. */
> + ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
> + if (!ret)
> + ret = -ETIMEDOUT;
> + if (ret < 0)
> + goto err;
> +
> + /* Read the data. */
> + *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> + ret = IIO_VAL_INT;
> +
> +err:
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> +
> + mutex_unlock(&lradc->lock);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
> +{
> + int ret, min, max;
> +
> + ret = mxs_lradc_read_single(iio_dev, 8, &min);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + ret = mxs_lradc_read_single(iio_dev, 9, &max);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + *val = max - min;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int *val, int *val2, long m)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> +
> + switch (m) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type == IIO_TEMP)
> + return mxs_lradc_read_temp(iio_dev, val);
> +
> + return mxs_lradc_read_single(iio_dev, chan->channel, val);
> +
> + case IIO_CHAN_INFO_SCALE:
> + if (chan->type == IIO_TEMP) {
> + /* From the datasheet, we have to multiply by 1.012 and
> + * divide by 4
> + */
> + *val = 0;
> + *val2 = 253000;
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + *val = lradc->vref_mv[chan->channel];
> + *val2 = chan->scan_type.realbits -
> + test_bit(chan->channel, &lradc->is_divided);
> + return IIO_VAL_FRACTIONAL_LOG2;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + if (chan->type == IIO_TEMP) {
> + /* The calculated value from the ADC is in Kelvin, we
> + * want Celsius for hwmon so the offset is -273.15
> + * The offset is applied before scaling so it is
> + * actually -213.15 * 4 / 1.012 = -1079.644268
> + */
> + *val = -1079;
> + *val2 = 644268;
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + return -EINVAL;
> +
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int val, int val2, long m)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio_dev);
> + struct mxs_lradc_scale *scale_avail =
> + lradc->scale_avail[chan->channel];
> + int ret;
> +
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + switch (m) {
> + case IIO_CHAN_INFO_SCALE:
> + ret = -EINVAL;
> + if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> + /* divider by two disabled */
> + clear_bit(chan->channel, &lradc->is_divided);
> + ret = 0;
> + } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> + /* divider by two enabled */
> + set_bit(chan->channel, &lradc->is_divided);
> + ret = 0;
> + }
> +
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + mutex_unlock(&lradc->lock);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + long m)
> +{
> + return IIO_VAL_INT_PLUS_NANO;
> +}
> +
> +static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
> + struct device_attribute *attr,
> + char *buf,
> + int ch)
> +{
> + struct iio_dev *iio = dev_to_iio_dev(dev);
> + struct mxs_lradc *lradc = iio_priv(iio);
> + int i, len = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
> + len += sprintf(buf + len, "%u.%09u ",
> + lradc->scale_avail[ch][i].integer,
> + lradc->scale_avail[ch][i].nano);
> +
> + len += sprintf(buf + len, "\n");
> +
> + return len;
> +}
> +
> +static ssize_t mxs_lradc_show_scale_available(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> +
> + return mxs_lradc_show_scale_available_ch(dev, attr, buf,
> + iio_attr->address);
> +}
> +
> +#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> +static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> + mxs_lradc_show_scale_available, NULL, ch)
> +
> +SHOW_SCALE_AVAILABLE_ATTR(0);
> +SHOW_SCALE_AVAILABLE_ATTR(1);
> +SHOW_SCALE_AVAILABLE_ATTR(2);
> +SHOW_SCALE_AVAILABLE_ATTR(3);
> +SHOW_SCALE_AVAILABLE_ATTR(4);
> +SHOW_SCALE_AVAILABLE_ATTR(5);
> +SHOW_SCALE_AVAILABLE_ATTR(6);
> +SHOW_SCALE_AVAILABLE_ATTR(7);
> +SHOW_SCALE_AVAILABLE_ATTR(10);
> +SHOW_SCALE_AVAILABLE_ATTR(11);
> +SHOW_SCALE_AVAILABLE_ATTR(12);
> +SHOW_SCALE_AVAILABLE_ATTR(13);
> +SHOW_SCALE_AVAILABLE_ATTR(14);
> +SHOW_SCALE_AVAILABLE_ATTR(15);
> +
> +static struct attribute *mxs_lradc_attributes[] = {
> + &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group mxs_lradc_attribute_group = {
> + .attrs = mxs_lradc_attributes,
> +};
> +
> +static const struct iio_info mxs_lradc_iio_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = mxs_lradc_read_raw,
> + .write_raw = mxs_lradc_write_raw,
> + .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
> + .attrs = &mxs_lradc_attribute_group,
> +};
> +
> +static int mxs_lradc_ts_open(struct input_dev *dev)
> +{
> + struct mxs_lradc *lradc = input_get_drvdata(dev);
> +
> + /* Enable the touch-detect circuitry. */
> + mxs_lradc_enable_touch_detection(lradc);
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
> +{
> + /* stop all interrupts from firing */
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
> +
> + /* Power-down touchscreen touch-detect circuitry. */
> + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> +}
> +
> +static void mxs_lradc_ts_close(struct input_dev *dev)
> +{
> + struct mxs_lradc *lradc = input_get_drvdata(dev);
> +
> + mxs_lradc_disable_ts(lradc);
> +}
> +
> +static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
> +{
> + struct input_dev *input;
> + struct device *dev = lradc->dev;
> + int ret;
> +
> + if (!lradc->use_touchscreen)
> + return 0;
> +
> + input = input_allocate_device();
> + if (!input)
> + return -ENOMEM;
> +
> + input->name = DRIVER_NAME;
> + input->id.bustype = BUS_HOST;
> + input->dev.parent = dev;
> + input->open = mxs_lradc_ts_open;
> + input->close = mxs_lradc_ts_close;
> +
> + __set_bit(EV_ABS, input->evbit);
> + __set_bit(EV_KEY, input->evbit);
> + __set_bit(BTN_TOUCH, input->keybit);
> + input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> + input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> + input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> + 0, 0);
> +
> + lradc->ts_input = input;
> + input_set_drvdata(input, lradc);
> + ret = input_register_device(input);
> + if (ret)
> + input_free_device(lradc->ts_input);
> +
> + return ret;
> +}
> +
> +static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> +{
> + if (!lradc->use_touchscreen)
> + return;
> +
> + mxs_lradc_disable_ts(lradc);
> + input_unregister_device(lradc->ts_input);
> +}
> +
> +/*
> + * IRQ Handling
> + */
> +static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
> +{
> + struct iio_dev *iio = data;
> + struct mxs_lradc *lradc = iio_priv(iio);
> + unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> + u32 clr_irq = mxs_lradc_irq_mask(lradc);
> + const u32 ts_irq_mask =
> + LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
> +
> + if (!(reg & mxs_lradc_irq_mask(lradc)))
> + return IRQ_NONE;
> +
> + if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
> + mxs_lradc_handle_touch(lradc);
> +
> + /* Make sure we don't clear the next conversion's interrupt. */
> + clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
> + }
> +
> + if (iio_buffer_enabled(iio)) {
> + if (reg & lradc->buffer_vchans)
> + iio_trigger_poll(iio->trig);
> + } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> + complete(&lradc->completion);
> + }
> +
> + mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * Trigger handling
> + */
> +static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *iio = pf->indio_dev;
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> + unsigned int i, j = 0;
> +
> + for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
> + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
> + lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
> + lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> + j++;
> + }
> +
> + iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
> +
> + iio_trigger_notify_done(iio->trig);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
> +{
> + struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> +
> + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> +
> + return 0;
> +}
> +
> +static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
> + .owner = THIS_MODULE,
> + .set_trigger_state = &mxs_lradc_configure_trigger,
> +};
> +
> +static int mxs_lradc_trigger_init(struct iio_dev *iio)
> +{
> + int ret;
> + struct iio_trigger *trig;
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
> + if (!trig)
> + return -ENOMEM;
> +
> + trig->dev.parent = lradc->dev;
> + iio_trigger_set_drvdata(trig, iio);
> + trig->ops = &mxs_lradc_trigger_ops;
> +
> + ret = iio_trigger_register(trig);
> + if (ret) {
> + iio_trigger_free(trig);
> + return ret;
> + }
> +
> + lradc->trig = trig;
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_trigger_remove(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + iio_trigger_unregister(lradc->trig);
> + iio_trigger_free(lradc->trig);
> +}
> +
> +static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> + int ret = 0, chan, ofs = 0;
> + unsigned long enable = 0;
> + u32 ctrl4_set = 0;
> + u32 ctrl4_clr = 0;
> + u32 ctrl1_irq = 0;
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> + const int len = bitmap_weight(iio->active_scan_mask,
> + LRADC_MAX_TOTAL_CHANS);
> +
> + if (!len)
> + return -EINVAL;
> +
> + /*
> + * Lock the driver so raw access can not be done during buffered
> + * operation. This simplifies the code a lot.
> + */
> + ret = mutex_trylock(&lradc->lock);
> + if (!ret)
> + return -EBUSY;
> +
> + lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
> + if (!lradc->buffer) {
> + ret = -ENOMEM;
> + goto err_mem;
> + }
> +
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(
> + lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> +
> + for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> + ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> + ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> + bitmap_set(&enable, ofs, 1);
> + ofs++;
> + }
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> + mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> + LRADC_DELAY(0));
> +
> + return 0;
> +
> +err_mem:
> + mutex_unlock(&lradc->lock);
> + return ret;
> +}
> +
> +static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> +
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(
> + lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> +
> + kfree(lradc->buffer);
> + mutex_unlock(&lradc->lock);
> +
> + return 0;
> +}
> +
> +static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
> + const unsigned long *mask)
> +{
> + struct mxs_lradc *lradc = iio_priv(iio);
> + const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> + int rsvd_chans = 0;
> + unsigned long rsvd_mask = 0;
> +
> + if (lradc->use_touchbutton)
> + rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> +
> + if (lradc->use_touchbutton)
> + rsvd_chans++;
> + if (lradc->use_touchscreen)
> + rsvd_chans += 2;
> +
> + /* Test for attempts to map channels with special mode of operation. */
> + if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> + return false;
> +
> + /* Test for attempts to map more channels then available slots. */
> + if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> + return false;
> +
> + return true;
> +}
> +
> +static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
> + .preenable = &mxs_lradc_buffer_preenable,
> + .postenable = &iio_triggered_buffer_postenable,
> + .predisable = &iio_triggered_buffer_predisable,
> + .postdisable = &mxs_lradc_buffer_postdisable,
> + .validate_scan_mask = &mxs_lradc_validate_scan_mask,
> +};
> +
> +/*
> + * Driver initialization
> + */
> +
> +#define MXS_ADC_CHAN(idx, chan_type, name) { \
> + .type = (chan_type), \
> + .indexed = 1, \
> + .scan_index = (idx), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .channel = (idx), \
> + .address = (idx), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = LRADC_RESOLUTION, \
> + .storagebits = 32, \
> + }, \
> + .datasheet_name = (name), \
> +}
> +
> +static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
> +{
> + /* The ADC always uses DELAY CHANNEL 0. */
> + const u32 adc_cfg =
> + (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> + (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> +
> + int ret = stmp_reset_block(lradc->base);
> +
> + if (ret)
> + return ret;
> +
> + /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> + mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> +
> + /* Disable remaining DELAY CHANNELs */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> +
> + /* Configure the touchscreen type */
> + if (lradc->soc == IMX28_LRADC) {
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + LRADC_CTRL0);
> +
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + LRADC_CTRL0);
> + }
> +
> + /* Start internal temperature sensing. */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
> +{
> + int i;
> +
> + mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
> +
> + for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
> +}
> +
> +static const struct of_device_id mxs_lradc_dt_ids[] = {
> + { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> + { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> +
> +static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
> + struct device_node *lradc_node)
> +{
> + int ret;
> + u32 ts_wires = 0, adapt;
> +
> + ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
> + &ts_wires);
> + if (ret)
> + return -ENODEV; /* touchscreen feature disabled */
> +
> + switch (ts_wires) {
> + case 4:
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> + break;
> + case 5:
> + if (lradc->soc == IMX28_LRADC) {
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> + break;
> + }
> + /* fall through an error message for i.MX23 */
> + default:
> + dev_err(lradc->dev,
> + "Unsupported number of touchscreen wires (%d)\n",
> + ts_wires);
> + return -EINVAL;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
> + lradc->over_sample_cnt = 4;
> + } else {
> + if (adapt < 1 || adapt > 32) {
> + dev_err(lradc->dev, "Invalid sample count (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->over_sample_cnt = adapt;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
> + lradc->over_sample_delay = 2;
> + } else {
> + if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
> + dev_err(lradc->dev, "Invalid sample delay (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->over_sample_delay = adapt;
> + }
> +
> + if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
> + lradc->settling_delay = 10;
> + } else {
> + if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
> + dev_err(lradc->dev, "Invalid settling delay (%u)\n",
> + adapt);
> + return -EINVAL;
> + }
> + lradc->settling_delay = adapt;
> + }
> +
> + return 0;
> +}
> +
> +static int mxs_lradc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> + const struct mxs_lradc_of_config *of_cfg =
> + &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct mxs_lradc *lradc;
> + struct iio_dev *iio;
> + struct resource *iores;
> + int ret = 0, touch_ret;
> + int i, s;
> + u64 scale_uv;
> +
> + /* Allocate the IIO device. */
> + iio = devm_iio_device_alloc(dev, sizeof(*lradc));
> + if (!iio) {
> + dev_err(dev, "Failed to allocate IIO device\n");
> + return -ENOMEM;
> + }
> +
> + lradc = iio_priv(iio);
> + lradc->soc = (enum mxs_lradc_id)of_id->data;
> +
> + /* Grab the memory area */
> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + lradc->dev = &pdev->dev;
> + lradc->base = devm_ioremap_resource(dev, iores);
> + if (IS_ERR(lradc->base))
> + return PTR_ERR(lradc->base);
> +
> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(lradc->clk)) {
> + dev_err(dev, "Failed to get the delay unit clock\n");
> + return PTR_ERR(lradc->clk);
> + }
> + ret = clk_prepare_enable(lradc->clk);
> + if (ret != 0) {
> + dev_err(dev, "Failed to enable the delay unit clock\n");
> + return ret;
> + }
> +
> + touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
> +
> + if (touch_ret == 0)
> + lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> + else
> + lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> +
> + /* Grab all IRQ sources */
> + for (i = 0; i < of_cfg->irq_count; i++) {
> + lradc->irq[i] = platform_get_irq(pdev, i);
> + if (lradc->irq[i] < 0) {
> + ret = lradc->irq[i];
> + goto err_clk;
> + }
> +
> + ret = devm_request_irq(dev, lradc->irq[i],
> + mxs_lradc_handle_irq, 0,
> + of_cfg->irq_name[i], iio);
> + if (ret)
> + goto err_clk;
> + }
> +
> + lradc->vref_mv = of_cfg->vref_mv;
> +
> + platform_set_drvdata(pdev, iio);
> +
> + init_completion(&lradc->completion);
> + mutex_init(&lradc->lock);
> +
> + iio->name = pdev->name;
> + iio->dev.parent = &pdev->dev;
> + iio->info = &mxs_lradc_iio_info;
> + iio->modes = INDIO_DIRECT_MODE;
> + iio->masklength = LRADC_MAX_TOTAL_CHANS;
> +
> + if (lradc->soc == IMX23_LRADC) {
> + iio->channels = mx23_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> + } else {
> + iio->channels = mx28_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> + }
> +
> + ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> + &mxs_lradc_trigger_handler,
> + &mxs_lradc_buffer_ops);
> + if (ret)
> + goto err_clk;
> +
> + ret = mxs_lradc_trigger_init(iio);
> + if (ret)
> + goto err_trig;
> +
> + /* Populate available ADC input ranges */
> + for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> + for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
> + /*
> + * [s=0] = optional divider by two disabled (default)
> + * [s=1] = optional divider by two enabled
> + *
> + * The scale is calculated by doing:
> + * Vref >> (realbits - s)
> + * which multiplies by two on the second component
> + * of the array.
> + */
> + scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> + (LRADC_RESOLUTION - s);
> + lradc->scale_avail[i][s].nano =
> + do_div(scale_uv, 100000000) * 10;
> + lradc->scale_avail[i][s].integer = scale_uv;
> + }
> + }
> +
> + /* Configure the hardware. */
> + ret = mxs_lradc_hw_init(lradc);
> + if (ret)
> + goto err_dev;
> +
> + /* Register the touchscreen input device. */
> + if (touch_ret == 0) {
> + ret = mxs_lradc_ts_register(lradc);
> + if (ret)
> + goto err_ts_register;
> + }
> +
> + /* Register IIO device. */
> + ret = iio_device_register(iio);
> + if (ret) {
> + dev_err(dev, "Failed to register IIO device\n");
> + goto err_ts;
> + }
> +
> + return 0;
> +
> +err_ts:
> + mxs_lradc_ts_unregister(lradc);
> +err_ts_register:
> + mxs_lradc_hw_stop(lradc);
> +err_dev:
> + mxs_lradc_trigger_remove(iio);
> +err_trig:
> + iio_triggered_buffer_cleanup(iio);
> +err_clk:
> + clk_disable_unprepare(lradc->clk);
> + return ret;
> +}
> +
> +static int mxs_lradc_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *iio = platform_get_drvdata(pdev);
> + struct mxs_lradc *lradc = iio_priv(iio);
> +
> + iio_device_unregister(iio);
> + mxs_lradc_ts_unregister(lradc);
> + mxs_lradc_hw_stop(lradc);
> + mxs_lradc_trigger_remove(iio);
> + iio_triggered_buffer_cleanup(iio);
> +
> + clk_disable_unprepare(lradc->clk);
> + return 0;
> +}
> +
> +static struct platform_driver mxs_lradc_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .of_match_table = mxs_lradc_dt_ids,
> + },
> + .probe = mxs_lradc_probe,
> + .remove = mxs_lradc_remove,
> +};
> +
> +module_platform_driver(mxs_lradc_driver);
> +
> +MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
> +MODULE_DESCRIPTION("Freescale MXS LRADC driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
> index 58d4517..53afaa2 100644
> --- a/drivers/staging/iio/adc/Kconfig
> +++ b/drivers/staging/iio/adc/Kconfig
> @@ -91,20 +91,6 @@ config LPC32XX_ADC
> activate only one via device tree selection. Provides direct access
> via sysfs.
>
> -config MXS_LRADC
> - tristate "Freescale i.MX23/i.MX28 LRADC"
> - depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
> - depends on INPUT
> - select STMP_DEVICE
> - select IIO_BUFFER
> - select IIO_TRIGGERED_BUFFER
> - help
> - Say yes here to build support for i.MX23/i.MX28 LRADC convertor
> - built into these chips.
> -
> - To compile this driver as a module, choose M here: the
> - module will be called mxs-lradc.
> -
> config SPEAR_ADC
> tristate "ST SPEAr ADC"
> depends on PLAT_SPEAR || COMPILE_TEST
> diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
> index 0c87ce3..3cdd83c 100644
> --- a/drivers/staging/iio/adc/Makefile
> +++ b/drivers/staging/iio/adc/Makefile
> @@ -12,5 +12,4 @@ obj-$(CONFIG_AD7816) += ad7816.o
> obj-$(CONFIG_AD7192) += ad7192.o
> obj-$(CONFIG_AD7280) += ad7280a.o
> obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
> -obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> deleted file mode 100644
> index bb1f152..0000000
> --- a/drivers/staging/iio/adc/mxs-lradc.c
> +++ /dev/null
> @@ -1,1770 +0,0 @@
> -/*
> - * Freescale MXS LRADC driver
> - *
> - * Copyright (c) 2012 DENX Software Engineering, GmbH.
> - * Marek Vasut <marex@denx.de>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - */
> -
> -#include <linux/bitops.h>
> -#include <linux/clk.h>
> -#include <linux/completion.h>
> -#include <linux/device.h>
> -#include <linux/err.h>
> -#include <linux/input.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/kernel.h>
> -#include <linux/module.h>
> -#include <linux/mutex.h>
> -#include <linux/of.h>
> -#include <linux/of_device.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
> -#include <linux/stmp_device.h>
> -#include <linux/sysfs.h>
> -
> -#include <linux/iio/buffer.h>
> -#include <linux/iio/iio.h>
> -#include <linux/iio/trigger.h>
> -#include <linux/iio/trigger_consumer.h>
> -#include <linux/iio/triggered_buffer.h>
> -#include <linux/iio/sysfs.h>
> -
> -#define DRIVER_NAME "mxs-lradc"
> -
> -#define LRADC_MAX_DELAY_CHANS 4
> -#define LRADC_MAX_MAPPED_CHANS 8
> -#define LRADC_MAX_TOTAL_CHANS 16
> -
> -#define LRADC_DELAY_TIMER_HZ 2000
> -
> -/*
> - * Make this runtime configurable if necessary. Currently, if the buffered mode
> - * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> - * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> - * seconds. The result is that the samples arrive every 500mS.
> - */
> -#define LRADC_DELAY_TIMER_PER 200
> -#define LRADC_DELAY_TIMER_LOOP 5
> -
> -/*
> - * Once the pen touches the touchscreen, the touchscreen switches from
> - * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
> - * is realized by worker thread, which is called every 20 or so milliseconds.
> - * This gives the touchscreen enough fluency and does not strain the system
> - * too much.
> - */
> -#define LRADC_TS_SAMPLE_DELAY_MS 5
> -
> -/*
> - * The LRADC reads the following amount of samples from each touchscreen
> - * channel and the driver then computes average of these.
> - */
> -#define LRADC_TS_SAMPLE_AMOUNT 4
> -
> -enum mxs_lradc_id {
> - IMX23_LRADC,
> - IMX28_LRADC,
> -};
> -
> -static const char * const mx23_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> -};
> -
> -static const char * const mx28_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-thresh0",
> - "mxs-lradc-thresh1",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> - "mxs-lradc-button0",
> - "mxs-lradc-button1",
> -};
> -
> -struct mxs_lradc_of_config {
> - const int irq_count;
> - const char * const *irq_name;
> - const u32 *vref_mv;
> -};
> -
> -#define VREF_MV_BASE 1850
> -
> -static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE * 2, /* CH6 VDDIO */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE, /* CH10 */
> - VREF_MV_BASE, /* CH11 */
> - VREF_MV_BASE, /* CH12 USB_DP */
> - VREF_MV_BASE, /* CH13 USB_DN */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE, /* CH6 */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE * 2, /* CH10 VDDIO */
> - VREF_MV_BASE, /* CH11 VTH */
> - VREF_MV_BASE * 2, /* CH12 VDDA */
> - VREF_MV_BASE, /* CH13 VDDD */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> - [IMX23_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> - .irq_name = mx23_lradc_irq_names,
> - .vref_mv = mx23_vref_mv,
> - },
> - [IMX28_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> - .irq_name = mx28_lradc_irq_names,
> - .vref_mv = mx28_vref_mv,
> - },
> -};
> -
> -enum mxs_lradc_ts {
> - MXS_LRADC_TOUCHSCREEN_NONE = 0,
> - MXS_LRADC_TOUCHSCREEN_4WIRE,
> - MXS_LRADC_TOUCHSCREEN_5WIRE,
> -};
> -
> -/*
> - * Touchscreen handling
> - */
> -enum lradc_ts_plate {
> - LRADC_TOUCH = 0,
> - LRADC_SAMPLE_X,
> - LRADC_SAMPLE_Y,
> - LRADC_SAMPLE_PRESSURE,
> - LRADC_SAMPLE_VALID,
> -};
> -
> -enum mxs_lradc_divbytwo {
> - MXS_LRADC_DIV_DISABLED = 0,
> - MXS_LRADC_DIV_ENABLED,
> -};
> -
> -struct mxs_lradc_scale {
> - unsigned int integer;
> - unsigned int nano;
> -};
> -
> -struct mxs_lradc {
> - struct device *dev;
> - void __iomem *base;
> - int irq[13];
> -
> - struct clk *clk;
> -
> - u32 *buffer;
> - struct iio_trigger *trig;
> -
> - struct mutex lock;
> -
> - struct completion completion;
> -
> - const u32 *vref_mv;
> - struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> - unsigned long is_divided;
> -
> - /*
> - * When the touchscreen is enabled, we give it two private virtual
> - * channels: #6 and #7. This means that only 6 virtual channels (instead
> - * of 8) will be available for buffered capture.
> - */
> -#define TOUCHSCREEN_VCHANNEL1 7
> -#define TOUCHSCREEN_VCHANNEL2 6
> -#define BUFFER_VCHANS_LIMITED 0x3f
> -#define BUFFER_VCHANS_ALL 0xff
> - u8 buffer_vchans;
> -
> - /*
> - * Furthermore, certain LRADC channels are shared between touchscreen
> - * and/or touch-buttons and generic LRADC block. Therefore when using
> - * either of these, these channels are not available for the regular
> - * sampling. The shared channels are as follows:
> - *
> - * CH0 -- Touch button #0
> - * CH1 -- Touch button #1
> - * CH2 -- Touch screen XPUL
> - * CH3 -- Touch screen YPLL
> - * CH4 -- Touch screen XNUL
> - * CH5 -- Touch screen YNLR
> - * CH6 -- Touch screen WIPER (5-wire only)
> - *
> - * The bit fields below represents which parts of the LRADC block are
> - * switched into special mode of operation. These channels can not
> - * be sampled as regular LRADC channels. The driver will refuse any
> - * attempt to sample these channels.
> - */
> -#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> -#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> -#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> - enum mxs_lradc_ts use_touchscreen;
> - bool use_touchbutton;
> -
> - struct input_dev *ts_input;
> -
> - enum mxs_lradc_id soc;
> - enum lradc_ts_plate cur_plate; /* state machine */
> - bool ts_valid;
> - unsigned ts_x_pos;
> - unsigned ts_y_pos;
> - unsigned ts_pressure;
> -
> - /* handle touchscreen's physical behaviour */
> - /* samples per coordinate */
> - unsigned over_sample_cnt;
> - /* time clocks between samples */
> - unsigned over_sample_delay;
> - /* time in clocks to wait after the plates where switched */
> - unsigned settling_delay;
> -};
> -
> -#define LRADC_CTRL0 0x00
> -# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> -# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> -# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> -# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> -# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> -# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> -# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> -# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> -
> -# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> -# define LRADC_CTRL0_MX23_YM BIT(19)
> -# define LRADC_CTRL0_MX23_XM BIT(18)
> -# define LRADC_CTRL0_MX23_YP BIT(17)
> -# define LRADC_CTRL0_MX23_XP BIT(16)
> -
> -# define LRADC_CTRL0_MX28_PLATE_MASK \
> - (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> - LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> - LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> -
> -# define LRADC_CTRL0_MX23_PLATE_MASK \
> - (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> - LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> -
> -#define LRADC_CTRL1 0x10
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> -#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> -#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> -#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> -#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> -
> -#define LRADC_CTRL2 0x20
> -#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> -#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> -
> -#define LRADC_STATUS 0x40
> -#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> -
> -#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> -#define LRADC_CH_ACCUMULATE BIT(29)
> -#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> -#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> -#define LRADC_CH_NUM_SAMPLES(x) \
> - ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> -#define LRADC_CH_VALUE_MASK 0x3ffff
> -#define LRADC_CH_VALUE_OFFSET 0
> -
> -#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> -#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> -#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> -#define LRADC_DELAY_TRIGGER(x) \
> - (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_LRADCS_MASK)
> -#define LRADC_DELAY_KICK BIT(20)
> -#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> -#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> -#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> - (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_DELAYS_MASK)
> -#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> -#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> -#define LRADC_DELAY_LOOP(x) \
> - (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> - LRADC_DELAY_LOOP_COUNT_MASK)
> -#define LRADC_DELAY_DELAY_MASK 0x7ff
> -#define LRADC_DELAY_DELAY_OFFSET 0
> -#define LRADC_DELAY_DELAY(x) \
> - (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> - LRADC_DELAY_DELAY_MASK)
> -
> -#define LRADC_CTRL4 0x140
> -#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> -#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> -#define LRADC_CTRL4_LRADCSELECT(n, x) \
> - (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> - LRADC_CTRL4_LRADCSELECT_MASK(n))
> -
> -#define LRADC_RESOLUTION 12
> -#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> -
> -static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> -}
> -
> -static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> -}
> -
> -static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg);
> -}
> -
> -static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_PLATE_MASK;
> - return LRADC_CTRL0_MX28_PLATE_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> -}
> -
> -static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
> - return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
> -}
> -
> -static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
> -{
> - return !!(readl(lradc->base + LRADC_STATUS) &
> - LRADC_STATUS_TOUCH_DETECT_RAW);
> -}
> -
> -static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
> - unsigned ch)
> -{
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
> -}
> -
> -static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
> -{
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
> - LRADC_CH(ch));
> -
> - /* from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
> -
> - /*
> - * prepare the delay/loop unit according to the oversampling count
> - *
> - * from the datasheet:
> - * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
> - * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
> - * the LRADC will not trigger the delay group."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay),
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * Pressure detection is special:
> - * We want to do both required measurements for the pressure detection in
> - * one turn. Use the hardware features to chain both conversions and let the
> - * hardware report one interrupt if both conversions are done
> - */
> -static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
> - unsigned ch2)
> -{
> - u32 reg;
> -
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - reg = LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
> -
> - /* from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
> -
> - /* prepare the delay/loop unit according to the oversampling count */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << ch1) |
> - LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
> -}
> -
> -static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
> - unsigned channel)
> -{
> - u32 reg;
> - unsigned num_samples, val;
> -
> - reg = readl(lradc->base + LRADC_CH(channel));
> - if (reg & LRADC_CH_ACCUMULATE)
> - num_samples = lradc->over_sample_cnt;
> - else
> - num_samples = 1;
> -
> - val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
> - return val / num_samples;
> -}
> -
> -static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
> - unsigned ch1, unsigned ch2)
> -{
> - u32 reg, mask;
> - unsigned pressure, m1, m2;
> -
> - mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> -
> - while (reg != mask) {
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> - dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
> - }
> -
> - m1 = mxs_lradc_read_raw_channel(lradc, ch1);
> - m2 = mxs_lradc_read_raw_channel(lradc, ch2);
> -
> - if (m2 == 0) {
> - dev_warn(lradc->dev, "Cannot calculate pressure\n");
> - return 1 << (LRADC_RESOLUTION - 1);
> - }
> -
> - /* simply scale the value from 0 ... max ADC resolution */
> - pressure = m1;
> - pressure *= (1 << LRADC_RESOLUTION);
> - pressure /= m2;
> -
> - dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
> - return pressure;
> -}
> -
> -#define TS_CH_XP 2
> -#define TS_CH_YP 3
> -#define TS_CH_XM 4
> -#define TS_CH_YM 5
> -
> -/*
> - * YP(open)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(weak+) XM(open)
> - *
> - * "weak+" means 200k Ohm VDDIO
> - * (-) means GND
> - */
> -static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
> -{
> - /*
> - * In order to detect a touch event the 'touch detect enable' bit
> - * enables:
> - * - a weak pullup to the X+ connector
> - * - a strong ground at the Y- connector
> - */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
> - LRADC_CTRL0);
> -}
> -
> -/*
> - * YP(meas)--+-------------+
> - * | |--+
> - * | | |
> - * YM(open)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(+) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_X;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(open) XM(meas)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_Y;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(meas)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(meas) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
> - mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> -
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc,
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - /*
> - * start with the Y-pos, because it uses nearly the same plate
> - * settings like the touch detection
> - */
> - mxs_lradc_prepare_y_pos(lradc);
> -}
> -
> -static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
> -{
> - input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
> - input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
> - input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
> - input_report_key(lradc->ts_input, BTN_TOUCH, 1);
> - input_sync(lradc->ts_input);
> -}
> -
> -static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> - lradc->cur_plate = LRADC_SAMPLE_VALID;
> - /*
> - * start a dummy conversion to burn time to settle the signals
> - * note: we are not interested in the conversion's value
> - */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> - LRADC_CTRL1);
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> - LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * in order to avoid false measurements, report only samples where
> - * the surface is still touched after the position measurement
> - */
> -static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
> -{
> - /* if it is still touched, report the sample */
> - if (valid && mxs_lradc_check_touch_event(lradc)) {
> - lradc->ts_valid = true;
> - mxs_lradc_report_ts_event(lradc);
> - }
> -
> - /* if it is even still touched, continue with the next measurement */
> - if (mxs_lradc_check_touch_event(lradc)) {
> - mxs_lradc_prepare_y_pos(lradc);
> - return;
> - }
> -
> - if (lradc->ts_valid) {
> - /* signal the release */
> - lradc->ts_valid = false;
> - input_report_key(lradc->ts_input, BTN_TOUCH, 0);
> - input_sync(lradc->ts_input);
> - }
> -
> - /* if it is released, wait for the next touch via IRQ */
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -/* touchscreen's state machine */
> -static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
> -{
> - switch (lradc->cur_plate) {
> - case LRADC_TOUCH:
> - if (mxs_lradc_check_touch_event(lradc))
> - mxs_lradc_start_touch_event(lradc);
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
> - LRADC_CTRL1);
> - return;
> -
> - case LRADC_SAMPLE_Y:
> - lradc->ts_y_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_x_pos(lradc);
> - return;
> -
> - case LRADC_SAMPLE_X:
> - lradc->ts_x_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_pressure(lradc);
> - return;
> -
> - case LRADC_SAMPLE_PRESSURE:
> - lradc->ts_pressure =
> - mxs_lradc_read_ts_pressure(lradc,
> - TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_complete_touch_event(lradc);
> - return;
> -
> - case LRADC_SAMPLE_VALID:
> - mxs_lradc_finish_touch_event(lradc, 1);
> - break;
> - }
> -}
> -
> -/*
> - * Raw I/O operations
> - */
> -static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - int ret;
> -
> - /*
> - * See if there is no buffered operation in progress. If there is, simply
> - * bail out. This can be improved to support both buffered and raw IO at
> - * the same time, yet the code becomes horribly complicated. Therefore I
> - * applied KISS principle here.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - reinit_completion(&lradc->completion);
> -
> - /*
> - * No buffered operation in progress, map the channel and trigger it.
> - * Virtual channel 0 is always used here as the others are always not
> - * used if doing raw sampling.
> - */
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> -
> - /* Enable / disable the divider per requirement */
> - if (test_bit(chan, &lradc->is_divided))
> - mxs_lradc_reg_set(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> - else
> - mxs_lradc_reg_clear(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> -
> - /* Clean the slot's previous content, then set new one. */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> -
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> -
> - /* Enable the IRQ and start sampling the channel. */
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> -
> - /* Wait for completion on the channel, 1 second max. */
> - ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
> - if (!ret)
> - ret = -ETIMEDOUT;
> - if (ret < 0)
> - goto err;
> -
> - /* Read the data. */
> - *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> - ret = IIO_VAL_INT;
> -
> -err:
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
> -{
> - int ret, min, max;
> -
> - ret = mxs_lradc_read_single(iio_dev, 8, &min);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - ret = mxs_lradc_read_single(iio_dev, 9, &max);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - *val = max - min;
> -
> - return IIO_VAL_INT;
> -}
> -
> -static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int *val, int *val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> -
> - switch (m) {
> - case IIO_CHAN_INFO_RAW:
> - if (chan->type == IIO_TEMP)
> - return mxs_lradc_read_temp(iio_dev, val);
> -
> - return mxs_lradc_read_single(iio_dev, chan->channel, val);
> -
> - case IIO_CHAN_INFO_SCALE:
> - if (chan->type == IIO_TEMP) {
> - /* From the datasheet, we have to multiply by 1.012 and
> - * divide by 4
> - */
> - *val = 0;
> - *val2 = 253000;
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - *val = lradc->vref_mv[chan->channel];
> - *val2 = chan->scan_type.realbits -
> - test_bit(chan->channel, &lradc->is_divided);
> - return IIO_VAL_FRACTIONAL_LOG2;
> -
> - case IIO_CHAN_INFO_OFFSET:
> - if (chan->type == IIO_TEMP) {
> - /* The calculated value from the ADC is in Kelvin, we
> - * want Celsius for hwmon so the offset is -273.15
> - * The offset is applied before scaling so it is
> - * actually -213.15 * 4 / 1.012 = -1079.644268
> - */
> - *val = -1079;
> - *val2 = 644268;
> -
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - return -EINVAL;
> -
> - default:
> - break;
> - }
> -
> - return -EINVAL;
> -}
> -
> -static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int val, int val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - struct mxs_lradc_scale *scale_avail =
> - lradc->scale_avail[chan->channel];
> - int ret;
> -
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - switch (m) {
> - case IIO_CHAN_INFO_SCALE:
> - ret = -EINVAL;
> - if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> - /* divider by two disabled */
> - clear_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> - /* divider by two enabled */
> - set_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - }
> -
> - break;
> - default:
> - ret = -EINVAL;
> - break;
> - }
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - long m)
> -{
> - return IIO_VAL_INT_PLUS_NANO;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
> - struct device_attribute *attr,
> - char *buf,
> - int ch)
> -{
> - struct iio_dev *iio = dev_to_iio_dev(dev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int i, len = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
> - len += sprintf(buf + len, "%u.%09u ",
> - lradc->scale_avail[ch][i].integer,
> - lradc->scale_avail[ch][i].nano);
> -
> - len += sprintf(buf + len, "\n");
> -
> - return len;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> -
> - return mxs_lradc_show_scale_available_ch(dev, attr, buf,
> - iio_attr->address);
> -}
> -
> -#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> -static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> - mxs_lradc_show_scale_available, NULL, ch)
> -
> -SHOW_SCALE_AVAILABLE_ATTR(0);
> -SHOW_SCALE_AVAILABLE_ATTR(1);
> -SHOW_SCALE_AVAILABLE_ATTR(2);
> -SHOW_SCALE_AVAILABLE_ATTR(3);
> -SHOW_SCALE_AVAILABLE_ATTR(4);
> -SHOW_SCALE_AVAILABLE_ATTR(5);
> -SHOW_SCALE_AVAILABLE_ATTR(6);
> -SHOW_SCALE_AVAILABLE_ATTR(7);
> -SHOW_SCALE_AVAILABLE_ATTR(10);
> -SHOW_SCALE_AVAILABLE_ATTR(11);
> -SHOW_SCALE_AVAILABLE_ATTR(12);
> -SHOW_SCALE_AVAILABLE_ATTR(13);
> -SHOW_SCALE_AVAILABLE_ATTR(14);
> -SHOW_SCALE_AVAILABLE_ATTR(15);
> -
> -static struct attribute *mxs_lradc_attributes[] = {
> - &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> - NULL
> -};
> -
> -static const struct attribute_group mxs_lradc_attribute_group = {
> - .attrs = mxs_lradc_attributes,
> -};
> -
> -static const struct iio_info mxs_lradc_iio_info = {
> - .driver_module = THIS_MODULE,
> - .read_raw = mxs_lradc_read_raw,
> - .write_raw = mxs_lradc_write_raw,
> - .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
> - .attrs = &mxs_lradc_attribute_group,
> -};
> -
> -static int mxs_lradc_ts_open(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - /* Enable the touch-detect circuitry. */
> - mxs_lradc_enable_touch_detection(lradc);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
> -{
> - /* stop all interrupts from firing */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
> -
> - /* Power-down touchscreen touch-detect circuitry. */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> -}
> -
> -static void mxs_lradc_ts_close(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - mxs_lradc_disable_ts(lradc);
> -}
> -
> -static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
> -{
> - struct input_dev *input;
> - struct device *dev = lradc->dev;
> - int ret;
> -
> - if (!lradc->use_touchscreen)
> - return 0;
> -
> - input = input_allocate_device();
> - if (!input)
> - return -ENOMEM;
> -
> - input->name = DRIVER_NAME;
> - input->id.bustype = BUS_HOST;
> - input->dev.parent = dev;
> - input->open = mxs_lradc_ts_open;
> - input->close = mxs_lradc_ts_close;
> -
> - __set_bit(EV_ABS, input->evbit);
> - __set_bit(EV_KEY, input->evbit);
> - __set_bit(BTN_TOUCH, input->keybit);
> - input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> - 0, 0);
> -
> - lradc->ts_input = input;
> - input_set_drvdata(input, lradc);
> - ret = input_register_device(input);
> - if (ret)
> - input_free_device(lradc->ts_input);
> -
> - return ret;
> -}
> -
> -static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> -{
> - if (!lradc->use_touchscreen)
> - return;
> -
> - mxs_lradc_disable_ts(lradc);
> - input_unregister_device(lradc->ts_input);
> -}
> -
> -/*
> - * IRQ Handling
> - */
> -static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
> -{
> - struct iio_dev *iio = data;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> - u32 clr_irq = mxs_lradc_irq_mask(lradc);
> - const u32 ts_irq_mask =
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
> -
> - if (!(reg & mxs_lradc_irq_mask(lradc)))
> - return IRQ_NONE;
> -
> - if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
> - mxs_lradc_handle_touch(lradc);
> -
> - /* Make sure we don't clear the next conversion's interrupt. */
> - clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
> - }
> -
> - if (iio_buffer_enabled(iio)) {
> - if (reg & lradc->buffer_vchans)
> - iio_trigger_poll(iio->trig);
> - } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> - complete(&lradc->completion);
> - }
> -
> - mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
> -
> - return IRQ_HANDLED;
> -}
> -
> -/*
> - * Trigger handling
> - */
> -static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
> -{
> - struct iio_poll_func *pf = p;
> - struct iio_dev *iio = pf->indio_dev;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - unsigned int i, j = 0;
> -
> - for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
> - lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
> - lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> - j++;
> - }
> -
> - iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
> -
> - iio_trigger_notify_done(iio->trig);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
> -{
> - struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> -
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> -
> - return 0;
> -}
> -
> -static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
> - .owner = THIS_MODULE,
> - .set_trigger_state = &mxs_lradc_configure_trigger,
> -};
> -
> -static int mxs_lradc_trigger_init(struct iio_dev *iio)
> -{
> - int ret;
> - struct iio_trigger *trig;
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
> - if (!trig)
> - return -ENOMEM;
> -
> - trig->dev.parent = lradc->dev;
> - iio_trigger_set_drvdata(trig, iio);
> - trig->ops = &mxs_lradc_trigger_ops;
> -
> - ret = iio_trigger_register(trig);
> - if (ret) {
> - iio_trigger_free(trig);
> - return ret;
> - }
> -
> - lradc->trig = trig;
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_trigger_remove(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_trigger_unregister(lradc->trig);
> - iio_trigger_free(lradc->trig);
> -}
> -
> -static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int ret = 0, chan, ofs = 0;
> - unsigned long enable = 0;
> - u32 ctrl4_set = 0;
> - u32 ctrl4_clr = 0;
> - u32 ctrl1_irq = 0;
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - const int len = bitmap_weight(iio->active_scan_mask,
> - LRADC_MAX_TOTAL_CHANS);
> -
> - if (!len)
> - return -EINVAL;
> -
> - /*
> - * Lock the driver so raw access can not be done during buffered
> - * operation. This simplifies the code a lot.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
> - if (!lradc->buffer) {
> - ret = -ENOMEM;
> - goto err_mem;
> - }
> -
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> -
> - for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> - ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> - ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> - bitmap_set(&enable, ofs, 1);
> - ofs++;
> - }
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> - mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> - LRADC_DELAY(0));
> -
> - return 0;
> -
> -err_mem:
> - mutex_unlock(&lradc->lock);
> - return ret;
> -}
> -
> -static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> -
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> -
> - kfree(lradc->buffer);
> - mutex_unlock(&lradc->lock);
> -
> - return 0;
> -}
> -
> -static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
> - const unsigned long *mask)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> - int rsvd_chans = 0;
> - unsigned long rsvd_mask = 0;
> -
> - if (lradc->use_touchbutton)
> - rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> -
> - if (lradc->use_touchbutton)
> - rsvd_chans++;
> - if (lradc->use_touchscreen)
> - rsvd_chans += 2;
> -
> - /* Test for attempts to map channels with special mode of operation. */
> - if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> - return false;
> -
> - /* Test for attempts to map more channels then available slots. */
> - if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> - return false;
> -
> - return true;
> -}
> -
> -static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
> - .preenable = &mxs_lradc_buffer_preenable,
> - .postenable = &iio_triggered_buffer_postenable,
> - .predisable = &iio_triggered_buffer_predisable,
> - .postdisable = &mxs_lradc_buffer_postdisable,
> - .validate_scan_mask = &mxs_lradc_validate_scan_mask,
> -};
> -
> -/*
> - * Driver initialization
> - */
> -
> -#define MXS_ADC_CHAN(idx, chan_type, name) { \
> - .type = (chan_type), \
> - .indexed = 1, \
> - .scan_index = (idx), \
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> - BIT(IIO_CHAN_INFO_SCALE), \
> - .channel = (idx), \
> - .address = (idx), \
> - .scan_type = { \
> - .sign = 'u', \
> - .realbits = LRADC_RESOLUTION, \
> - .storagebits = 32, \
> - }, \
> - .datasheet_name = (name), \
> -}
> -
> -static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
> -{
> - /* The ADC always uses DELAY CHANNEL 0. */
> - const u32 adc_cfg =
> - (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> - (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> -
> - int ret = stmp_reset_block(lradc->base);
> -
> - if (ret)
> - return ret;
> -
> - /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> - mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> -
> - /* Disable remaining DELAY CHANNELs */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> -
> - /* Configure the touchscreen type */
> - if (lradc->soc == IMX28_LRADC) {
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> -
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> - }
> -
> - /* Start internal temperature sensing. */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
> -{
> - int i;
> -
> - mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
> -
> - for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
> -}
> -
> -static const struct of_device_id mxs_lradc_dt_ids[] = {
> - { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> - { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> - { /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> -
> -static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
> - struct device_node *lradc_node)
> -{
> - int ret;
> - u32 ts_wires = 0, adapt;
> -
> - ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
> - &ts_wires);
> - if (ret)
> - return -ENODEV; /* touchscreen feature disabled */
> -
> - switch (ts_wires) {
> - case 4:
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> - break;
> - case 5:
> - if (lradc->soc == IMX28_LRADC) {
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> - break;
> - }
> - /* fall through an error message for i.MX23 */
> - default:
> - dev_err(lradc->dev,
> - "Unsupported number of touchscreen wires (%d)\n",
> - ts_wires);
> - return -EINVAL;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
> - lradc->over_sample_cnt = 4;
> - } else {
> - if (adapt < 1 || adapt > 32) {
> - dev_err(lradc->dev, "Invalid sample count (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_cnt = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
> - lradc->over_sample_delay = 2;
> - } else {
> - if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
> - dev_err(lradc->dev, "Invalid sample delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_delay = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
> - lradc->settling_delay = 10;
> - } else {
> - if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
> - dev_err(lradc->dev, "Invalid settling delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->settling_delay = adapt;
> - }
> -
> - return 0;
> -}
> -
> -static int mxs_lradc_probe(struct platform_device *pdev)
> -{
> - const struct of_device_id *of_id =
> - of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> - const struct mxs_lradc_of_config *of_cfg =
> - &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> - struct device *dev = &pdev->dev;
> - struct device_node *node = dev->of_node;
> - struct mxs_lradc *lradc;
> - struct iio_dev *iio;
> - struct resource *iores;
> - int ret = 0, touch_ret;
> - int i, s;
> - u64 scale_uv;
> -
> - /* Allocate the IIO device. */
> - iio = devm_iio_device_alloc(dev, sizeof(*lradc));
> - if (!iio) {
> - dev_err(dev, "Failed to allocate IIO device\n");
> - return -ENOMEM;
> - }
> -
> - lradc = iio_priv(iio);
> - lradc->soc = (enum mxs_lradc_id)of_id->data;
> -
> - /* Grab the memory area */
> - iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - lradc->dev = &pdev->dev;
> - lradc->base = devm_ioremap_resource(dev, iores);
> - if (IS_ERR(lradc->base))
> - return PTR_ERR(lradc->base);
> -
> - lradc->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(lradc->clk)) {
> - dev_err(dev, "Failed to get the delay unit clock\n");
> - return PTR_ERR(lradc->clk);
> - }
> - ret = clk_prepare_enable(lradc->clk);
> - if (ret != 0) {
> - dev_err(dev, "Failed to enable the delay unit clock\n");
> - return ret;
> - }
> -
> - touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
> -
> - if (touch_ret == 0)
> - lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> - else
> - lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> -
> - /* Grab all IRQ sources */
> - for (i = 0; i < of_cfg->irq_count; i++) {
> - lradc->irq[i] = platform_get_irq(pdev, i);
> - if (lradc->irq[i] < 0) {
> - ret = lradc->irq[i];
> - goto err_clk;
> - }
> -
> - ret = devm_request_irq(dev, lradc->irq[i],
> - mxs_lradc_handle_irq, 0,
> - of_cfg->irq_name[i], iio);
> - if (ret)
> - goto err_clk;
> - }
> -
> - lradc->vref_mv = of_cfg->vref_mv;
> -
> - platform_set_drvdata(pdev, iio);
> -
> - init_completion(&lradc->completion);
> - mutex_init(&lradc->lock);
> -
> - iio->name = pdev->name;
> - iio->dev.parent = &pdev->dev;
> - iio->info = &mxs_lradc_iio_info;
> - iio->modes = INDIO_DIRECT_MODE;
> - iio->masklength = LRADC_MAX_TOTAL_CHANS;
> -
> - if (lradc->soc == IMX23_LRADC) {
> - iio->channels = mx23_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> - } else {
> - iio->channels = mx28_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> - }
> -
> - ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> - &mxs_lradc_trigger_handler,
> - &mxs_lradc_buffer_ops);
> - if (ret)
> - goto err_clk;
> -
> - ret = mxs_lradc_trigger_init(iio);
> - if (ret)
> - goto err_trig;
> -
> - /* Populate available ADC input ranges */
> - for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> - for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
> - /*
> - * [s=0] = optional divider by two disabled (default)
> - * [s=1] = optional divider by two enabled
> - *
> - * The scale is calculated by doing:
> - * Vref >> (realbits - s)
> - * which multiplies by two on the second component
> - * of the array.
> - */
> - scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> - (LRADC_RESOLUTION - s);
> - lradc->scale_avail[i][s].nano =
> - do_div(scale_uv, 100000000) * 10;
> - lradc->scale_avail[i][s].integer = scale_uv;
> - }
> - }
> -
> - /* Configure the hardware. */
> - ret = mxs_lradc_hw_init(lradc);
> - if (ret)
> - goto err_dev;
> -
> - /* Register the touchscreen input device. */
> - if (touch_ret == 0) {
> - ret = mxs_lradc_ts_register(lradc);
> - if (ret)
> - goto err_ts_register;
> - }
> -
> - /* Register IIO device. */
> - ret = iio_device_register(iio);
> - if (ret) {
> - dev_err(dev, "Failed to register IIO device\n");
> - goto err_ts;
> - }
> -
> - return 0;
> -
> -err_ts:
> - mxs_lradc_ts_unregister(lradc);
> -err_ts_register:
> - mxs_lradc_hw_stop(lradc);
> -err_dev:
> - mxs_lradc_trigger_remove(iio);
> -err_trig:
> - iio_triggered_buffer_cleanup(iio);
> -err_clk:
> - clk_disable_unprepare(lradc->clk);
> - return ret;
> -}
> -
> -static int mxs_lradc_remove(struct platform_device *pdev)
> -{
> - struct iio_dev *iio = platform_get_drvdata(pdev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_device_unregister(iio);
> - mxs_lradc_ts_unregister(lradc);
> - mxs_lradc_hw_stop(lradc);
> - mxs_lradc_trigger_remove(iio);
> - iio_triggered_buffer_cleanup(iio);
> -
> - clk_disable_unprepare(lradc->clk);
> - return 0;
> -}
> -
> -static struct platform_driver mxs_lradc_driver = {
> - .driver = {
> - .name = DRIVER_NAME,
> - .of_match_table = mxs_lradc_dt_ids,
> - },
> - .probe = mxs_lradc_probe,
> - .remove = mxs_lradc_remove,
> -};
> -
> -module_platform_driver(mxs_lradc_driver);
> -
> -MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
> -MODULE_DESCRIPTION("Freescale MXS LRADC driver");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:" DRIVER_NAME);
>

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  Last update: 2016-02-08 19:41    [W:0.194 / U:8.048 seconds]
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