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SubjectRe: [PATCH v2 2/4] iio: add LM3533 ambient light sensor driver
On 5/3/2012 11:26 AM, Johan Hovold wrote:
> Add sub-driver for the ambient light sensor interface on National
> Semiconductor / TI LM3533 lighting power chips.
>
> The sensor interface can be used to control the LEDs and backlights of
> the chip through defining five light zones and three sets of
> corresponding brightness target levels.
>
> The driver provides raw and mean adc readings along with the current
> light zone through sysfs. A threshold event can be generated on zone
> changes.
Code is fine. Pretty much all my comments are to do with the interface.
>
> Signed-off-by: Johan Hovold<jhovold@gmail.com>
> ---
>
> v2:
> - reimplement using iio
> - add sysfs-ABI documentation
>
>
> .../Documentation/sysfs-bus-iio-light-lm3533-als | 62 ++
> drivers/staging/iio/light/Kconfig | 16 +
> drivers/staging/iio/light/Makefile | 1 +
> drivers/staging/iio/light/lm3533-als.c | 617 ++++++++++++++++++++
> 4 files changed, 696 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/iio/Documentation/sysfs-bus-iio-light-lm3533-als
> create mode 100644 drivers/staging/iio/light/lm3533-als.c
>
> diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-light-lm3533-als b/drivers/staging/iio/Documentation/sysfs-bus-iio-light-lm3533-als
> new file mode 100644
> index 0000000..9849d14
> --- /dev/null
> +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-light-lm3533-als
> @@ -0,0 +1,62 @@
> +What: /sys/bus/iio/devices/iio:deviceX/gain
> +Date: April 2012
> +KernelVersion: 3.5
> +Contact: Johan Hovold<jhovold@gmail.com>
> +Description:
> + Set the ALS gain-resistor setting (0..127) for analog input
> + mode, where
> +
> + 0000000 - ALS input is high impedance
> + 0000001 - 200kOhm (10uA at 2V full-scale)
> + 0000010 - 100kOhm (20uA at 2V full-scale)
> + ...
> + 1111110 - 1.587kOhm (1.26mA at 2V full-scale)
> + 1111111 - 1.575kOhm (1.27mA at 2V full-scale)
> +
> + R_als = 2V / (10uA * gain) (gain> 0)
Firstly, no magic numbers. These are definitely magic. Secondly see
in_illuminance0_scale for a suitable existing attribute.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/illuminance_zone
> +Date: April 2012
> +KernelVersion: 3.5
> +Contact: Johan Hovold<jhovold@gmail.com>
> +Description:
> + Get the current light zone (0..4) as defined by the
> + in_illuminance_thresh[n]_{falling,rising} thresholds.
Hmm.. definitely have an in prefix, beyond that I'm not sure what the
cleanest
interface will be for this. Could extend the event codes to deal with the
zone index. Slightly tricky as the channel could already be modified so
chan2 isn't necesarily available.
> +
> +What: /sys/.../events/in_illuminance_thresh_either_en
> +Date: April 2012
> +KernelVersion: 3.5
> +Contact: Johan Hovold<jhovold@gmail.com>
> +Description:
> + Event generated when channel passes one of the four threshold
> + in either direction (rising|falling) and a zone change occurs.
> + The corresponding light zone can be read from
> + illuminance_zone.
> +
> +What: /sys/.../events/illuminance_thresh0_falling_value
hmm.. every time you think you are making progress a new and exciting
device comes
along requiring the abi to be extended.
in_illuminanceX_threshY_rising_value
in_illuminanceX_threshY_falling_value
should do with appropriate description.
> +What: /sys/.../events/illuminance_thresh0_raising_value
> +What: /sys/.../events/illuminance_thresh1_falling_value
> +What: /sys/.../events/illuminance_thresh1_raising_value
> +What: /sys/.../events/illuminance_thresh2_falling_value
> +What: /sys/.../events/illuminance_thresh2_raising_value
> +What: /sys/.../events/illuminance_thresh3_falling_value
> +What: /sys/.../events/illuminance_thresh3_raising_value
> +Date: April 2012
> +KernelVersion: 3.5
> +Contact: Johan Hovold<jhovold@gmail.com>
> +Description:
> + Specifies the value of threshold that the device is comparing
> + against for the events enabled by
> + in_illuminance_thresh_either_en, and defines the
> + the five light zones.
> +
> + These thresholds correspond to the eight zone-boundary
> + registers (boundary[n]_{low,high}).
> +
This interface is going to take some thought. We have
in_illuminance0_target at the
moment, so I guess we can add a zoning concept to that...
> +What: /sys/bus/iio/devices/iio:deviceX/target[m]_[n]
> +Date: April 2012
> +KernelVersion: 3.5
> +Contact: Johan Hovold<jhovold@gmail.com>
> +Description:
> + Set the target brightness for ALS-mapper m in light zone n
> + (0..255), where m in 1..3 and n in 0..4.
Don't suppose you could do a quick summary of what these zones are and
why there
are 3 ALS-mappers? I'm not getting terribly far on a quick look at the
datasheet!
> diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig
> index e7e9159..263e44a 100644
> --- a/drivers/staging/iio/light/Kconfig
> +++ b/drivers/staging/iio/light/Kconfig
> @@ -24,6 +24,22 @@ config SENSORS_TSL2563
> This driver can also be built as a module. If so, the module
> will be called tsl2563.
>
> +config SENSORS_LM3533
> + tristate "LM3533 ambient light sensor"
> + depends on MFD_LM3533
> + help
> + If you say yes here you get support for the ambient light sensor
> + interface on National Semiconductor / TI LM3533 Lighting Power
> + chips.
> +
> + The sensor interface can be used to control the LEDs and backlights
> + of the chip through defining five light zones and three sets of
> + corresponding brightness target levels.
> +
> + The driver provides raw and mean adc readings along with the current
> + light zone through sysfs. A threshold event can be generated on zone
> + changes.
> +
> config TSL2583
> tristate "TAOS TSL2580, TSL2581 and TSL2583 light-to-digital converters"
> depends on I2C
> diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile
> index 3011fbf..16a60a2 100644
> --- a/drivers/staging/iio/light/Makefile
> +++ b/drivers/staging/iio/light/Makefile
> @@ -4,4 +4,5 @@
>
> obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
> obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
> +obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
> obj-$(CONFIG_TSL2583) += tsl2583.o
> diff --git a/drivers/staging/iio/light/lm3533-als.c b/drivers/staging/iio/light/lm3533-als.c
> new file mode 100644
> index 0000000..e2c9be6
> --- /dev/null
> +++ b/drivers/staging/iio/light/lm3533-als.c
> @@ -0,0 +1,617 @@
> +/*
> + * lm3533-als.c -- LM3533 Ambient Light Sensor driver
> + *
> + * Copyright (C) 2011-2012 Texas Instruments
> + *
> + * Author: Johan Hovold<jhovold@gmail.com>
> + *
> + * 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.
> + */
> +
> +#include<linux/atomic.h>
> +#include<linux/fs.h>
> +#include<linux/interrupt.h>
> +#include<linux/io.h>
> +#include<linux/module.h>
> +#include<linux/mfd/core.h>
> +#include<linux/platform_device.h>
> +#include<linux/slab.h>
> +#include<linux/uaccess.h>
> +
> +#include<linux/mfd/lm3533.h>
> +
> +#include "../events.h"
> +#include "../iio.h"
This will need to go through the staging-next tree. In there these
headers have moved.
> +
> +
> +#define LM3533_ALS_RESISTOR_MAX 0x7f
> +#define LM3533_ALS_ADC_MAX 0xff
> +#define LM3533_ALS_BOUNDARY_MAX LM3533_ALS_ADC_MAX
> +#define LM3533_ALS_TARGET_MAX LM3533_ALS_ADC_MAX
> +#define LM3533_ALS_ZONE_MAX 4
> +
> +#define LM3533_REG_ALS_RESISTOR_SELECT 0x30
> +#define LM3533_REG_ALS_CONF 0x31
> +#define LM3533_REG_ALS_ZONE_INFO 0x34
> +#define LM3533_REG_ALS_READ_ADC_AVERAGE 0x37
> +#define LM3533_REG_ALS_READ_ADC_RAW 0x38
> +#define LM3533_REG_ALS_BOUNDARY0_HIGH 0x50
> +#define LM3533_REG_ALS_BOUNDARY0_LOW 0x51
> +#define LM3533_REG_ALS_BOUNDARY1_HIGH 0x52
> +#define LM3533_REG_ALS_BOUNDARY1_LOW 0x53
> +#define LM3533_REG_ALS_BOUNDARY2_HIGH 0x54
> +#define LM3533_REG_ALS_BOUNDARY2_LOW 0x55
> +#define LM3533_REG_ALS_BOUNDARY3_HIGH 0x56
> +#define LM3533_REG_ALS_BOUNDARY3_LOW 0x57
> +#define LM3533_REG_ALS_M1_TARGET_0 0x60
> +#define LM3533_REG_ALS_M1_TARGET_1 0x61
> +#define LM3533_REG_ALS_M1_TARGET_2 0x62
> +#define LM3533_REG_ALS_M1_TARGET_3 0x63
> +#define LM3533_REG_ALS_M1_TARGET_4 0x64
> +#define LM3533_REG_ALS_M2_TARGET_0 0x65
> +#define LM3533_REG_ALS_M2_TARGET_1 0x66
> +#define LM3533_REG_ALS_M2_TARGET_2 0x67
> +#define LM3533_REG_ALS_M2_TARGET_3 0x68
> +#define LM3533_REG_ALS_M2_TARGET_4 0x69
> +#define LM3533_REG_ALS_M3_TARGET_0 0x6a
> +#define LM3533_REG_ALS_M3_TARGET_1 0x6b
> +#define LM3533_REG_ALS_M3_TARGET_2 0x6c
> +#define LM3533_REG_ALS_M3_TARGET_3 0x6d
> +#define LM3533_REG_ALS_M3_TARGET_4 0x6e
> +
> +#define LM3533_ALS_ENABLE_MASK 0x01
> +#define LM3533_ALS_INPUT_MODE_MASK 0x02
> +#define LM3533_ALS_INT_ENABLE_MASK 0x01
> +
> +#define LM3533_ALS_ZONE_SHIFT 2
> +#define LM3533_ALS_ZONE_MASK 0x1c
> +
> +#define LM3533_ALS_FLAG_INT_ENABLED 1
> +
> +
> +struct lm3533_als {
> + struct lm3533 *lm3533;
> +
> + unsigned long flags;
> + int irq;
> +
> + atomic_t zone;
> +};
> +
> +
> +static int lm3533_als_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val1, int *val2, long mask)
> +{
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 reg;
> + u8 val;
> + int ret;
> +
> + switch (mask) {
> + case 0:
> + reg = LM3533_REG_ALS_READ_ADC_RAW;
> + break;
> + case IIO_CHAN_INFO_AVERAGE_RAW:
> + reg = LM3533_REG_ALS_READ_ADC_AVERAGE;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + ret = lm3533_read(als->lm3533, reg,&val);
> + if (ret) {
> + dev_err(&indio_dev->dev, "failed to read adc\n");
> + return ret;
> + }
> +
> + *val1 = val;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static const struct iio_chan_spec lm3533_als_channels[] = {
> + {
> + .type = IIO_LIGHT,
> + .info_mask = IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT,
> + .channel = 0,
channel doesn't get used unless you also set indexed = 1.
> + }
> +};
> +
> +static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
> +{
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 val;
> + int ret;
> +
> + ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO,&val);
> + if (ret) {
> + dev_err(&indio_dev->dev, "failed to read zone\n");
> + return ret;
> + }
> +
> + val = (val& LM3533_ALS_ZONE_MASK)>> LM3533_ALS_ZONE_SHIFT;
> + *zone = min_t(u8, val, LM3533_ALS_ZONE_MAX);
> +
> + return 0;
> +}
> +
> +static irqreturn_t lm3533_als_isr(int irq, void *dev_id)
> +{
> +
> + struct iio_dev *indio_dev = dev_id;
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 zone;
> + int ret;
> +
> + /* Clear interrupt by reading the ALS zone register. */
> + ret = lm3533_als_get_zone(indio_dev,&zone);
> + if (ret)
> + goto out;
> +
> + atomic_set(&als->zone, zone);
> +
> + iio_push_event(indio_dev,
> + IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
> + 0,
> + IIO_EV_TYPE_THRESH,
> + IIO_EV_DIR_EITHER),
> + iio_get_time_ns());
> +out:
> + return IRQ_HANDLED;
> +}
> +
> +static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable)
> +{
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 mask = LM3533_ALS_INT_ENABLE_MASK;
> + u8 val;
> + int ret;
> +
> + if (enable)
> + val = mask;
> + else
> + val = 0;
> +
> + ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask);
> + if (ret) {
> + dev_err(&indio_dev->dev, "failed to set int mode %d\n",
> + enable);
extra brackets.
> + }
> +
> + return ret;
> +}
> +
> +static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable)
> +{
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 mask = LM3533_ALS_INT_ENABLE_MASK;
> + u8 val;
> + int ret;
> +
> + ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO,&val);
> + if (ret) {
> + dev_err(&indio_dev->dev, "failed to get int mode\n");
> + return ret;
> + }
> +
> + *enable = !!(val& mask);
> +
> + return 0;
> +}
> +
> +static int show_thresh_either_en(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> + int enable;
> + int ret;
> +
> + if (als->irq) {
> + ret = lm3533_als_get_int_mode(indio_dev,&enable);
> + if (ret)
> + return ret;
> + } else {
> + enable = 0;
> + }
> +
> + return scnprintf(buf, PAGE_SIZE, "%u\n", enable);
> +}
> +
> +static int store_thresh_either_en(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> + unsigned long enable;
> + bool int_enabled;
> + u8 zone;
> + int ret;
> +
> + if (!als->irq)
> + return -EBUSY;
> +
> + if (kstrtoul(buf, 0,&enable))
> + return -EINVAL;
> +
> + int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED,&als->flags);
> +
> + if (enable&& !int_enabled) {
> + ret = lm3533_als_get_zone(indio_dev,&zone);
> + if (ret)
> + return ret;
> +
> + atomic_set(&als->zone, zone);
> +
> + set_bit(LM3533_ALS_FLAG_INT_ENABLED,&als->flags);
> + }
> +
> + ret = lm3533_als_set_int_mode(indio_dev, enable);
> + if (ret) {
> + if (!int_enabled)
> + clear_bit(LM3533_ALS_FLAG_INT_ENABLED,&als->flags);
> +
> + return ret;
> + }
> +
> + if (!enable)
> + clear_bit(LM3533_ALS_FLAG_INT_ENABLED,&als->flags);
> +
> + return len;
> +}
> +
> +static ssize_t show_zone(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> + u8 zone;
> + int ret;
> +
> + if (test_bit(LM3533_ALS_FLAG_INT_ENABLED,&als->flags)) {
> + zone = atomic_read(&als->zone);
> + } else {
> + ret = lm3533_als_get_zone(indio_dev,&zone);
> + if (ret)
> + return ret;
> + }
> +
> + return scnprintf(buf, PAGE_SIZE, "%u\n", zone);
> +}
> +
> +struct lm3533_device_attribute {
> + struct device_attribute dev_attr;
> + u8 reg;
> + u8 max;
> +};
> +
> +#define to_lm3533_dev_attr(_dev_attr) \
> + container_of(_dev_attr, struct lm3533_device_attribute, dev_attr)
> +
> +static ssize_t show_lm3533_als_reg(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> + struct lm3533_device_attribute *lm3533_attr = to_lm3533_dev_attr(attr);
> + u8 val;
> + int ret;
> +
> + ret = lm3533_read(als->lm3533, lm3533_attr->reg,&val);
> + if (ret)
> + return ret;
> +
> + return scnprintf(buf, PAGE_SIZE, "%u\n", val);
> +}
> +
> +static ssize_t store_lm3533_als_reg(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> + struct lm3533_device_attribute *lm3533_attr = to_lm3533_dev_attr(attr);
> + u8 val;
> + int ret;
> +
> + if (kstrtou8(buf, 0,&val) || val> lm3533_attr->max)
> + return -EINVAL;
> +
> + ret = lm3533_write(als->lm3533, lm3533_attr->reg, val);
> + if (ret)
> + return ret;
> +
> + return len;
> +}
> +
> +#define REG_ATTR(_name, _mode, _show, _store, _reg, _max) \
> + { .dev_attr = __ATTR(_name, _mode, _show, _store), \
> + .reg = _reg, \
> + .max = _max }
> +
> +#define LM3533_REG_ATTR(_name, _mode, _show, _store, _reg, _max) \
> + struct lm3533_device_attribute lm3533_dev_attr_##_name \
> + = REG_ATTR(_name, _mode, _show, _store, _reg, _max)
> +
> +#define LM3533_REG_ATTR_RW(_name, _reg, _max) \
> + LM3533_REG_ATTR(_name, S_IRUGO | S_IWUSR, show_lm3533_als_reg, \
> + store_lm3533_als_reg, _reg, _max)
> +
> +#define ALS_THRESH_FALLING_ATTR_RW(_nr) \
> + LM3533_REG_ATTR_RW(in_illuminance_thresh##_nr##_falling_value, \
> + LM3533_REG_ALS_BOUNDARY##_nr##_LOW, LM3533_ALS_BOUNDARY_MAX)
> +
> +#define ALS_THRESH_RAISING_ATTR_RW(_nr) \
> + LM3533_REG_ATTR_RW(in_illuminance_thresh##_nr##_raising_value, \
> + LM3533_REG_ALS_BOUNDARY##_nr##_HIGH, LM3533_ALS_BOUNDARY_MAX)
> +
> +/* ALS Zone thresholds (boundaries)
> + *
> + * in_illuminance_thresh[0-3]_falling_value 0-255
> + * in_illuminance_thresh[0-3]_raising_value 0-255
> + */
> +static ALS_THRESH_FALLING_ATTR_RW(0);
> +static ALS_THRESH_FALLING_ATTR_RW(1);
> +static ALS_THRESH_FALLING_ATTR_RW(2);
> +static ALS_THRESH_FALLING_ATTR_RW(3);
> +
> +static ALS_THRESH_RAISING_ATTR_RW(0);
> +static ALS_THRESH_RAISING_ATTR_RW(1);
> +static ALS_THRESH_RAISING_ATTR_RW(2);
> +static ALS_THRESH_RAISING_ATTR_RW(3);
> +
> +#define LM3533_ALS_ATTR_RO(_name) \
> + DEVICE_ATTR(in_illuminance_##_name, S_IRUGO, show_##_name, NULL)
> +#define LM3533_ALS_ATTR_RW(_name) \
> + DEVICE_ATTR(in_illuminance_##_name, S_IRUGO | S_IWUSR , \
> + show_##_name, store_##_name)
> +
> +/* ALS Zone threshold-event enable
> + *
> + * in_illuminance_thresh_either_en 0,1
> + */
> +static LM3533_ALS_ATTR_RW(thresh_either_en);
> +
> +/* ALS Current Zone
> + *
> + * in_illuminance_zone 0-4
> + */
> +static LM3533_ALS_ATTR_RO(zone);
> +
> +#define ALS_TARGET_ATTR_RW(_mapper, _nr) \
> + LM3533_REG_ATTR_RW(target##_mapper##_##_nr, \
> + LM3533_REG_ALS_M##_mapper##_TARGET_##_nr, LM3533_ALS_TARGET_MAX)
> +
> +/* ALS Mapper targets
> + *
> + * target[1-3]_[0-4] 0-255
> + */
> +static ALS_TARGET_ATTR_RW(1, 0);
> +static ALS_TARGET_ATTR_RW(1, 1);
> +static ALS_TARGET_ATTR_RW(1, 2);
> +static ALS_TARGET_ATTR_RW(1, 3);
> +static ALS_TARGET_ATTR_RW(1, 4);
> +
> +static ALS_TARGET_ATTR_RW(2, 0);
> +static ALS_TARGET_ATTR_RW(2, 1);
> +static ALS_TARGET_ATTR_RW(2, 2);
> +static ALS_TARGET_ATTR_RW(2, 3);
> +static ALS_TARGET_ATTR_RW(2, 4);
> +
> +static ALS_TARGET_ATTR_RW(3, 0);
> +static ALS_TARGET_ATTR_RW(3, 1);
> +static ALS_TARGET_ATTR_RW(3, 2);
> +static ALS_TARGET_ATTR_RW(3, 3);
> +static ALS_TARGET_ATTR_RW(3, 4);
> +
> +/* ALS Gain resistor setting
> + *
> + * gain 0-127
> + */
> +static LM3533_REG_ATTR_RW(gain, LM3533_REG_ALS_RESISTOR_SELECT,
> + LM3533_ALS_RESISTOR_MAX);
> +
> +static struct attribute *lm3533_als_event_attributes[] = {
> + &dev_attr_in_illuminance_thresh_either_en.attr,
> + &lm3533_dev_attr_in_illuminance_thresh0_falling_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh0_raising_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh1_falling_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh1_raising_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh2_falling_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh2_raising_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh3_falling_value.dev_attr.attr,
> + &lm3533_dev_attr_in_illuminance_thresh3_raising_value.dev_attr.attr,
> + NULL
> +};
> +
> +static struct attribute_group lm3533_als_event_attribute_group = {
> + .attrs = lm3533_als_event_attributes
> +};
> +
> +static struct attribute *lm3533_als_attributes[] = {
> + &lm3533_dev_attr_target1_0.dev_attr.attr,
> + &lm3533_dev_attr_target1_1.dev_attr.attr,
> + &lm3533_dev_attr_target1_2.dev_attr.attr,
> + &lm3533_dev_attr_target1_3.dev_attr.attr,
> + &lm3533_dev_attr_target1_4.dev_attr.attr,
> + &lm3533_dev_attr_target2_0.dev_attr.attr,
> + &lm3533_dev_attr_target2_1.dev_attr.attr,
> + &lm3533_dev_attr_target2_2.dev_attr.attr,
> + &lm3533_dev_attr_target2_3.dev_attr.attr,
> + &lm3533_dev_attr_target2_4.dev_attr.attr,
> + &lm3533_dev_attr_target3_0.dev_attr.attr,
> + &lm3533_dev_attr_target3_1.dev_attr.attr,
> + &lm3533_dev_attr_target3_2.dev_attr.attr,
> + &lm3533_dev_attr_target3_3.dev_attr.attr,
> + &lm3533_dev_attr_target3_4.dev_attr.attr,
> + &lm3533_dev_attr_gain.dev_attr.attr,
> + &dev_attr_in_illuminance_zone.attr,
> + NULL
> +};
> +
> +static struct attribute_group lm3533_als_attribute_group = {
> + .attrs = lm3533_als_attributes
> +};
> +
> +static int __devinit lm3533_als_set_input_mode(struct lm3533 *lm3533,
> + int pwm_mode)
> +{
> + u8 mask = LM3533_ALS_INPUT_MODE_MASK;
> + u8 val;
> + int ret;
> +
> + if (pwm_mode)
> + val = mask; /* pwm input */
> + else
> + val = 0; /* analog input */
> +
> + ret = lm3533_update(lm3533, LM3533_REG_ALS_CONF, mask, mask);
> + if (ret) {
> + dev_err(lm3533->dev,
> + "failed to set input mode %d\n", pwm_mode);
> + }
> +
> + return ret;
> +}
> +
> +static int __devinit lm3533_als_enable(struct lm3533 *lm3533)
> +{
> + u8 mask = LM3533_ALS_ENABLE_MASK;
> + int ret;
> +
> + ret = lm3533_update(lm3533, LM3533_REG_ALS_CONF, mask, mask);
> + if (ret)
> + dev_err(lm3533->dev, "failed to enable ALS\n");
> +
> + return ret;
> +}
> +
> +static int lm3533_als_disable(struct lm3533 *lm3533)
> +{
> + u8 mask = LM3533_ALS_ENABLE_MASK;
> + int ret;
> +
> + ret = lm3533_update(lm3533, LM3533_REG_ALS_CONF, 0, mask);
> + if (ret)
> + dev_err(lm3533->dev, "failed to disable ALS\n");
> +
> + return ret;
> +}
> +
> +static const struct iio_info lm3533_als_info = {
> + .attrs =&lm3533_als_attribute_group,
> + .event_attrs =&lm3533_als_event_attribute_group,
> + .driver_module = THIS_MODULE,
> + .read_raw =&lm3533_als_read_raw,
> +};
> +
> +static int __devinit lm3533_als_probe(struct platform_device *pdev)
> +{
> + struct lm3533 *lm3533;
> + struct lm3533_als_platform_data *pdata;
> + struct lm3533_als *als;
> + struct iio_dev *indio_dev;
> + int ret;
> +
> + dev_dbg(&pdev->dev, "%s\n", __func__);
> +
> + lm3533 = dev_get_drvdata(pdev->dev.parent);
> + if (!lm3533)
> + return -EINVAL;
> +
> + pdata = pdev->dev.platform_data;
> + if (!pdata) {
> + dev_err(&pdev->dev, "no platform data\n");
> + return -EINVAL;
> + }
> +
> + indio_dev = iio_allocate_device(sizeof(*als));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + indio_dev->info =&lm3533_als_info;
> + indio_dev->channels = lm3533_als_channels;
> + indio_dev->num_channels = ARRAY_SIZE(lm3533_als_channels);
> + indio_dev->name = "lm3533-als";
> + indio_dev->dev.parent = pdev->dev.parent;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + als = iio_priv(indio_dev);
> + als->lm3533 = lm3533;
> + als->irq = lm3533->irq;
> + atomic_set(&als->zone, 0);
> +
> + if (als->irq) {
> + ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> + indio_dev->name, indio_dev);
> + if (ret) {
> + dev_err(&indio_dev->dev, "failed to request irq %d\n",
> + lm3533->irq);
> + goto err_free;
> + }
> + }
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + ret = lm3533_als_set_input_mode(lm3533, pdata->pwm_mode);
> + if (ret)
> + goto err_free;
> +
> + ret = lm3533_als_enable(lm3533);
> + if (ret)
> + goto err_free;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to register ALS\n");
> + goto err_disable;
> + }
> +
> + return 0;
> +
> +err_disable:
> + lm3533_als_disable(lm3533);
> +err_free:
> + iio_free_device(indio_dev);
> +
> + return ret;
> +}
> +
> +static int __devexit lm3533_als_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct lm3533_als *als = iio_priv(indio_dev);
> +
> + dev_dbg(&pdev->dev, "%s\n", __func__);
> +
> + iio_device_unregister(indio_dev);
> + lm3533_als_disable(als->lm3533);
> + if (als->irq)
> + free_irq(als->irq, indio_dev);
> + iio_free_device(indio_dev);
> +
> + return 0;
> +}
> +
> +static struct platform_driver lm3533_als_driver = {
> + .driver = {
> + .name = "lm3533-als",
> + .owner = THIS_MODULE,
> + },
> + .probe = lm3533_als_probe,
> + .remove = __devexit_p(lm3533_als_remove),
> +};
> +module_platform_driver(lm3533_als_driver);
> +
> +MODULE_AUTHOR("Johan Hovold<jhovold@gmail.com>");
> +MODULE_DESCRIPTION("LM3533 Ambient Light Sensor driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:lm3533-als");



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