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SubjectRe: [PATCH 3/6] IIO:ADC:ad799x initial import.
On 11/08/2011 01:07 PM, Lars-Peter Clausen wrote:
> On 11/07/2011 03:52 PM, jic23@cam.ac.uk wrote:
>> From: Michael Hennerich <michael.hennerich@analog.com>
>>
>> Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
>> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
>> ---
>> drivers/iio/adc/Kconfig | 11 +
>> drivers/iio/adc/Makefile | 5 +-
>> drivers/iio/adc/ad799x_core.c | 761 +++++++++++++++++++++++++++++++++++++++++
>> include/linux/iio/ad799x.h | 12 +
>> 4 files changed, 788 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>> index 0673d78..3d97b21 100644
>> --- a/drivers/iio/adc/Kconfig
>> +++ b/drivers/iio/adc/Kconfig
>> @@ -3,6 +3,17 @@
>> #
>> menu "Analog to digital convertors"
>>
>> +config IIO_AD799X
>> + tristate "Analog Devices AD799x ADC driver"
>> + depends on I2C
>> + select IIO_TRIGGER if IIO_BUFFER
>> + select AD799X_RING_BUFFER
>
> ringbuffer and trigger support is still in staging.
>
Good point.
> Also we have another problem here, we now have to drivers for the same
> device, both with the same symbol name. This won't really work.
which name? iio_ prefix deals with everything other than udev getting
confused about which module to load.
>
>
>> + help
>> + Say yes here to build support for Analog Devices:
>> + ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998
>> + i2c analog to digital convertors (ADC). Provides direct access
>> + via sysfs.
>> +
>> config IIO_MAX1363
>> tristate "Maxim max1363 ADC driver"
>> depends on I2C
>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
>> index 6064fff..c197334 100644
>> --- a/drivers/iio/adc/Makefile
>> +++ b/drivers/iio/adc/Makefile
>> @@ -2,5 +2,8 @@
>> # Makefile for IIO ADCs
>> #
>>
>> +iio_ad799x-y := ad799x_core.o
>> +obj-$(CONFIG_IIO_AD799X) += iio_ad799x.o
>> +
>> iio_max1363-y := max1363_core.o
>> -obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
>> +obj-$(CONFIG_IIO_MAX1363) += iio_max1363.o
>> \ No newline at end of file
>> diff --git a/drivers/iio/adc/ad799x_core.c b/drivers/iio/adc/ad799x_core.c
>> new file mode 100644
>> index 0000000..a9e8f5f
>> --- /dev/null
>> +++ b/drivers/iio/adc/ad799x_core.c
>> @@ -0,0 +1,761 @@
>> +/*
>> + * iio/adc/ad799x.c
>> + * Copyright (C) 2010-1011 Michael Hennerich, Analog Devices Inc.
>> + *
>> + * based on iio/adc/max1363
>> + * Copyright (C) 2008-2010 Jonathan Cameron
>> + *
>> + * based on linux/drivers/i2c/chips/max123x
>> + * Copyright (C) 2002-2004 Stefan Eletzhofer
>> + *
>> + * based on linux/drivers/acron/char/pcf8583.c
>> + * Copyright (C) 2000 Russell King
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * ad799x.c
>> + *
>> + * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
>> + * ad7998 and similar chips.
>> + *
>> + */
>> +
>> +#include <linux/interrupt.h>
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/sysfs.h>
>> +#include <linux/i2c.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/slab.h>
>> +#include <linux/types.h>
>> +#include <linux/err.h>
>> +#include <linux/module.h>
>> +
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/sysfs.h>
>> +#include <linux/iio/ad799x.h>
>> +
>> +#define AD799X_CHANNEL_SHIFT 4
>> +/*
>> + * AD7991, AD7995 and AD7999 defines
>> + */
>> +
>> +#define AD7991_REF_SEL 0x08
>> +#define AD7991_FLTR 0x04
>> +#define AD7991_BIT_TRIAL_DELAY 0x02
>> +#define AD7991_SAMPLE_DELAY 0x01
>> +
>> +/*
>> + * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
>> + */
>> +
>> +#define AD7998_FLTR 0x08
>> +#define AD7998_ALERT_EN 0x04
>> +#define AD7998_BUSY_ALERT 0x02
>> +#define AD7998_BUSY_ALERT_POL 0x01
>> +
>> +#define AD7998_CONV_RES_REG 0x0
>> +#define AD7998_ALERT_STAT_REG 0x1
>> +#define AD7998_CONF_REG 0x2
>> +#define AD7998_CYCLE_TMR_REG 0x3
>> +#define AD7998_DATALOW_CH1_REG 0x4
>> +#define AD7998_DATAHIGH_CH1_REG 0x5
>> +#define AD7998_HYST_CH1_REG 0x6
>> +#define AD7998_DATALOW_CH2_REG 0x7
>> +#define AD7998_DATAHIGH_CH2_REG 0x8
>> +#define AD7998_HYST_CH2_REG 0x9
>> +#define AD7998_DATALOW_CH3_REG 0xA
>> +#define AD7998_DATAHIGH_CH3_REG 0xB
>> +#define AD7998_HYST_CH3_REG 0xC
>> +#define AD7998_DATALOW_CH4_REG 0xD
>> +#define AD7998_DATAHIGH_CH4_REG 0xE
>> +#define AD7998_HYST_CH4_REG 0xF
>> +
>> +#define AD7998_CYC_MASK 0x7
>> +#define AD7998_CYC_DIS 0x0
>> +#define AD7998_CYC_TCONF_32 0x1
>> +#define AD7998_CYC_TCONF_64 0x2
>> +#define AD7998_CYC_TCONF_128 0x3
>> +#define AD7998_CYC_TCONF_256 0x4
>> +#define AD7998_CYC_TCONF_512 0x5
>> +#define AD7998_CYC_TCONF_1024 0x6
>> +#define AD7998_CYC_TCONF_2048 0x7
>> +
>> +#define AD7998_ALERT_STAT_CLEAR 0xFF
>> +
>> +/*
>> + * AD7997 and AD7997 defines
>> + */
>> +
>> +#define AD7997_8_READ_SINGLE 0x80
>> +#define AD7997_8_READ_SEQUENCE 0x70
>> +/* TODO: move this into a common header */
>> +#define RES_MASK(bits) ((1 << (bits)) - 1)
>> +
>> +enum {
>> + ad7991,
>> + ad7995,
>> + ad7999,
>> + ad7992,
>> + ad7993,
>> + ad7994,
>> + ad7997,
>> + ad7998
>> +};
>> +
>> +struct ad799x_state;
>> +
>> +/**
>> + * struct ad799x_chip_info - chip specifc information
>> + * @channel: channel specification
>> + * @num_channels: number of channels
>> + * @int_vref_mv: the internal reference voltage
>> + */
>> +struct ad799x_chip_info {
>> + struct iio_chan_spec channel[9];
>> + int num_channels;
>> + u16 int_vref_mv;
>> +};
>> +
>> +struct ad799x_state {
>> + struct i2c_client *client;
>> + const struct ad799x_chip_info *chip_info;
>> + struct regulator *reg;
>> + u16 int_vref_mv;
>> + unsigned id;
>> + char *name;
>> + u16 config;
>> +};
>> +
>> +/*
>> + * ad799x register access by I2C
>> + */
>> +static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
>> +{
>> + struct i2c_client *client = st->client;
>> + int ret = 0;
>> +
>> + ret = i2c_smbus_read_word_data(client, reg);
>> + if (ret < 0) {
>> + dev_err(&client->dev, "I2C read error\n");
>> + return ret;
>> + }
>> +
>> + *data = swab16((u16)ret);
>> +
>> + return 0;
>> +}
>> +
>> +static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
>> +{
>> + u16 rxbuf;
>> + u8 cmd;
>> + int ret;
>> +
>> + switch (st->id) {
>> + case ad7991:
>> + case ad7995:
>> + case ad7999:
>> + cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
>> + break;
>> + case ad7992:
>> + case ad7993:
>> + case ad7994:
>> + cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
>> + break;
>> + case ad7997:
>> + case ad7998:
>> + cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + ret = ad799x_i2c_read16(st, cmd, &rxbuf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + return rxbuf;
>> +}
>> +
>> +static int ad799x_read_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *chan,
>> + int *val,
>> + int *val2,
>> + long m)
>> +{
>> + int ret;
>> + struct ad799x_state *st = iio_priv(indio_dev);
>> + unsigned int scale_uv;
>> +
>> + switch (m) {
>> + case 0:
>> + mutex_lock(&indio_dev->mlock);
>> + ret = ad799x_scan_direct(st, chan->channel);
>> + mutex_unlock(&indio_dev->mlock);
>> +
>> + if (ret < 0)
>> + return ret;
>> + *val = (ret >> chan->scan_type.shift) &
>> + RES_MASK(chan->scan_type.realbits);
>> + return IIO_VAL_INT;
>> + case IIO_CHAN_INFO_SCALE:
>> + scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
>> + *val = scale_uv / 1000;
>> + *val2 = (scale_uv % 1000) * 1000;
>> + return IIO_VAL_INT_PLUS_MICRO;
>> + }
>> + return -EINVAL;
>> +}
>> +
>> +static const struct iio_info ad799X_info = {
>> + .read_raw = &ad799x_read_raw,
>> + .driver_module = THIS_MODULE,
>> +};
>> +
>> +
>> +static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
>> + [ad7991] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + },
>> + .num_channels = 5,
>> + .int_vref_mv = 4096,
>> + },
>> + [ad7995] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + },
>> + .num_channels = 5,
>> + .int_vref_mv = 1024,
>> + },
>> + [ad7999] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 8,
>> + .shift = 4,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 8,
>> + .shift = 4,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 8,
>> + .shift = 4,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 8,
>> + .shift = 4,
>> + },
>> + },
>> + },
>> + .num_channels = 5,
>> + .int_vref_mv = 1024,
>> + },
>> + [ad7992] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + },
>> + .num_channels = 3,
>> + .int_vref_mv = 4096,
>> + },
>> + [ad7993] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + },
>> + .num_channels = 5,
>> + .int_vref_mv = 1024,
>> + },
>> + [ad7994] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + },
>> + .num_channels = 5,
>> + .int_vref_mv = 4096,
>> + },
>> + [ad7997] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [4] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 4,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [5] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 5,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [6] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 6,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + [7] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 7,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 10,
>> + .shift = 2,
>> + },
>> + },
>> + },
>> + .num_channels = 9,
>> + .int_vref_mv = 1024,
>> + },
>> + [ad7998] = {
>> + .channel = {
>> + [0] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 0,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [1] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 1,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [2] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 2,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [3] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 3,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [4] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 4,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [5] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 5,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [6] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 6,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + [7] = {
>> + .type = IIO_VOLTAGE,
>> + .indexed = 1,
>> + .channel = 7,
>> + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT,
>> + .scan_type = {
>> + .realbits = 12,
>> + .shift = 0,
>> + },
>> + },
>> + },
>> + .num_channels = 9,
>> + .int_vref_mv = 4096,
>> + },
>> +};
>
> All 'num_channels' fields needs to be decremented by one since the
> IIO_CHAN_SOFT_TIMESTAMP channel was removed.
Excellent point.
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