staging:iio:adc: Add AD7791 driver
This patch adds support for the Analog Devices AD7787, AD7788, AD7789, AD7790 and AD7791 Sigma Delta Analog-to-Digital converters. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen
Jonathan Cameron
parent
bf83238019
commit
7b123c85bb
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@ -18,6 +18,18 @@ config AD7266
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Say yes here to build support for Analog Devices AD7265 and AD7266
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Say yes here to build support for Analog Devices AD7265 and AD7266
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ADCs.
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ADCs.
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config AD7791
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tristate "Analog Devices AD7791 ADC driver"
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depends on SPI
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select AD_SIGMA_DELTA
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help
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Say yes here to build support for Analog Devices AD7787, AD7788, AD7789,
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AD7790 and AD7791 SPI analog to digital converters (ADC). If unsure, say
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N (but it is safe to say "Y").
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To compile this driver as a module, choose M here: the module will be
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called ad7791.
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config AT91_ADC
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config AT91_ADC
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tristate "Atmel AT91 ADC"
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tristate "Atmel AT91 ADC"
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depends on ARCH_AT91
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depends on ARCH_AT91
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@ -4,4 +4,5 @@
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obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
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obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
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obj-$(CONFIG_AD7266) += ad7266.o
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obj-$(CONFIG_AD7266) += ad7266.o
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obj-$(CONFIG_AD7791) += ad7791.o
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obj-$(CONFIG_AT91_ADC) += at91_adc.o
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obj-$(CONFIG_AT91_ADC) += at91_adc.o
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@ -0,0 +1,460 @@
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/*
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* AD7787/AD7788/AD7789/AD7790/AD7791 SPI ADC driver
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*
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* Copyright 2012 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/adc/ad_sigma_delta.h>
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#include <linux/platform_data/ad7791.h>
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#define AD7791_REG_COMM 0x0 /* For writes */
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#define AD7791_REG_STATUS 0x0 /* For reads */
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#define AD7791_REG_MODE 0x1
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#define AD7791_REG_FILTER 0x2
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#define AD7791_REG_DATA 0x3
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#define AD7791_MODE_CONTINUOUS 0x00
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#define AD7791_MODE_SINGLE 0x02
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#define AD7791_MODE_POWERDOWN 0x03
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#define AD7791_CH_AIN1P_AIN1N 0x00
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#define AD7791_CH_AIN2 0x01
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#define AD7791_CH_AIN1N_AIN1N 0x02
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#define AD7791_CH_AVDD_MONITOR 0x03
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#define AD7791_FILTER_CLK_DIV_1 (0x0 << 4)
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#define AD7791_FILTER_CLK_DIV_2 (0x1 << 4)
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#define AD7791_FILTER_CLK_DIV_4 (0x2 << 4)
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#define AD7791_FILTER_CLK_DIV_8 (0x3 << 4)
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#define AD7791_FILTER_CLK_MASK (0x3 << 4)
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#define AD7791_FILTER_RATE_120 0x0
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#define AD7791_FILTER_RATE_100 0x1
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#define AD7791_FILTER_RATE_33_3 0x2
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#define AD7791_FILTER_RATE_20 0x3
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#define AD7791_FILTER_RATE_16_6 0x4
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#define AD7791_FILTER_RATE_16_7 0x5
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#define AD7791_FILTER_RATE_13_3 0x6
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#define AD7791_FILTER_RATE_9_5 0x7
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#define AD7791_FILTER_RATE_MASK 0x7
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#define AD7791_MODE_BUFFER BIT(1)
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#define AD7791_MODE_UNIPOLAR BIT(2)
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#define AD7791_MODE_BURNOUT BIT(3)
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#define AD7791_MODE_SEL_MASK (0x3 << 6)
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#define AD7791_MODE_SEL(x) ((x) << 6)
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#define DECLARE_AD7787_CHANNELS(name, bits, storagebits) \
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const struct iio_chan_spec name[] = { \
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AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
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(bits), (storagebits), 0), \
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AD_SD_CHANNEL(1, 1, AD7791_CH_AIN2, (bits), (storagebits), 0), \
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AD_SD_SHORTED_CHANNEL(2, 0, AD7791_CH_AIN1N_AIN1N, \
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(bits), (storagebits), 0), \
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AD_SD_SUPPLY_CHANNEL(3, 2, AD7791_CH_AVDD_MONITOR, \
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(bits), (storagebits), 0), \
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IIO_CHAN_SOFT_TIMESTAMP(4), \
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}
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#define DECLARE_AD7791_CHANNELS(name, bits, storagebits) \
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const struct iio_chan_spec name[] = { \
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AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
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(bits), (storagebits), 0), \
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AD_SD_SHORTED_CHANNEL(1, 0, AD7791_CH_AIN1N_AIN1N, \
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(bits), (storagebits), 0), \
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AD_SD_SUPPLY_CHANNEL(2, 1, AD7791_CH_AVDD_MONITOR, \
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(bits), (storagebits), 0), \
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IIO_CHAN_SOFT_TIMESTAMP(3), \
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}
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static DECLARE_AD7787_CHANNELS(ad7787_channels, 24, 32);
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static DECLARE_AD7791_CHANNELS(ad7790_channels, 16, 16);
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static DECLARE_AD7791_CHANNELS(ad7791_channels, 24, 32);
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enum {
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AD7787,
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AD7788,
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AD7789,
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AD7790,
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AD7791,
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};
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enum ad7791_chip_info_flags {
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AD7791_FLAG_HAS_FILTER = (1 << 0),
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AD7791_FLAG_HAS_BUFFER = (1 << 1),
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AD7791_FLAG_HAS_UNIPOLAR = (1 << 2),
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AD7791_FLAG_HAS_BURNOUT = (1 << 3),
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};
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struct ad7791_chip_info {
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const struct iio_chan_spec *channels;
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unsigned int num_channels;
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enum ad7791_chip_info_flags flags;
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};
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static const struct ad7791_chip_info ad7791_chip_infos[] = {
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[AD7787] = {
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.channels = ad7787_channels,
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.num_channels = ARRAY_SIZE(ad7787_channels),
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.flags = AD7791_FLAG_HAS_FILTER | AD7791_FLAG_HAS_BUFFER |
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AD7791_FLAG_HAS_UNIPOLAR | AD7791_FLAG_HAS_BURNOUT,
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},
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[AD7788] = {
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.channels = ad7790_channels,
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.num_channels = ARRAY_SIZE(ad7790_channels),
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.flags = AD7791_FLAG_HAS_UNIPOLAR,
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},
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[AD7789] = {
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.channels = ad7791_channels,
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.num_channels = ARRAY_SIZE(ad7791_channels),
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.flags = AD7791_FLAG_HAS_UNIPOLAR,
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},
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[AD7790] = {
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.channels = ad7790_channels,
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.num_channels = ARRAY_SIZE(ad7790_channels),
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.flags = AD7791_FLAG_HAS_FILTER | AD7791_FLAG_HAS_BUFFER |
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AD7791_FLAG_HAS_BURNOUT,
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},
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[AD7791] = {
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.channels = ad7791_channels,
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.num_channels = ARRAY_SIZE(ad7791_channels),
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.flags = AD7791_FLAG_HAS_FILTER | AD7791_FLAG_HAS_BUFFER |
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AD7791_FLAG_HAS_UNIPOLAR | AD7791_FLAG_HAS_BURNOUT,
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},
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};
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struct ad7791_state {
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struct ad_sigma_delta sd;
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uint8_t mode;
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uint8_t filter;
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struct regulator *reg;
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const struct ad7791_chip_info *info;
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};
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static struct ad7791_state *ad_sigma_delta_to_ad7791(struct ad_sigma_delta *sd)
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{
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return container_of(sd, struct ad7791_state, sd);
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}
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static int ad7791_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
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{
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ad_sd_set_comm(sd, channel);
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return 0;
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}
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static int ad7791_set_mode(struct ad_sigma_delta *sd,
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enum ad_sigma_delta_mode mode)
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{
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struct ad7791_state *st = ad_sigma_delta_to_ad7791(sd);
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switch (mode) {
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case AD_SD_MODE_CONTINUOUS:
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mode = AD7791_MODE_CONTINUOUS;
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break;
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case AD_SD_MODE_SINGLE:
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mode = AD7791_MODE_SINGLE;
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break;
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case AD_SD_MODE_IDLE:
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case AD_SD_MODE_POWERDOWN:
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mode = AD7791_MODE_POWERDOWN;
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break;
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}
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st->mode &= ~AD7791_MODE_SEL_MASK;
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st->mode |= AD7791_MODE_SEL(mode);
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return ad_sd_write_reg(sd, AD7791_REG_MODE, sizeof(st->mode), st->mode);
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}
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static const struct ad_sigma_delta_info ad7791_sigma_delta_info = {
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.set_channel = ad7791_set_channel,
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.set_mode = ad7791_set_mode,
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.has_registers = true,
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.addr_shift = 4,
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.read_mask = BIT(3),
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};
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static int ad7791_read_raw(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, int *val, int *val2, long info)
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{
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struct ad7791_state *st = iio_priv(indio_dev);
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bool unipolar = !!(st->mode & AD7791_MODE_UNIPOLAR);
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unsigned long long scale_pv;
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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return ad_sigma_delta_single_conversion(indio_dev, chan, val);
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case IIO_CHAN_INFO_OFFSET:
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/**
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* Unipolar: 0 to VREF
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* Bipolar -VREF to VREF
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**/
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if (unipolar)
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*val = 0;
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else
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*val = -(1 << (chan->scan_type.realbits - 1));
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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/* The monitor channel uses an internal reference. */
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if (chan->address == AD7791_CH_AVDD_MONITOR) {
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scale_pv = 5850000000000ULL;
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} else {
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int voltage_uv;
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voltage_uv = regulator_get_voltage(st->reg);
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if (voltage_uv < 0)
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return voltage_uv;
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scale_pv = (unsigned long long)voltage_uv * 1000000;
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}
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if (unipolar)
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scale_pv >>= chan->scan_type.realbits;
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else
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scale_pv >>= chan->scan_type.realbits - 1;
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*val2 = do_div(scale_pv, 1000000000);
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*val = scale_pv;
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return IIO_VAL_INT_PLUS_NANO;
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}
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return -EINVAL;
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}
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static const char * const ad7791_sample_freq_avail[] = {
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[AD7791_FILTER_RATE_120] = "120",
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[AD7791_FILTER_RATE_100] = "100",
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[AD7791_FILTER_RATE_33_3] = "33.3",
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[AD7791_FILTER_RATE_20] = "20",
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[AD7791_FILTER_RATE_16_6] = "16.6",
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[AD7791_FILTER_RATE_16_7] = "16.7",
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[AD7791_FILTER_RATE_13_3] = "13.3",
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[AD7791_FILTER_RATE_9_5] = "9.5",
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};
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static ssize_t ad7791_read_frequency(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad7791_state *st = iio_priv(indio_dev);
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unsigned int rate = st->filter & AD7791_FILTER_RATE_MASK;
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return sprintf(buf, "%s\n", ad7791_sample_freq_avail[rate]);
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}
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static ssize_t ad7791_write_frequency(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad7791_state *st = iio_priv(indio_dev);
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int i, ret;
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mutex_lock(&indio_dev->mlock);
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if (iio_buffer_enabled(indio_dev)) {
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mutex_unlock(&indio_dev->mlock);
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return -EBUSY;
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}
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mutex_unlock(&indio_dev->mlock);
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ret = -EINVAL;
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for (i = 0; i < ARRAY_SIZE(ad7791_sample_freq_avail); i++) {
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if (sysfs_streq(ad7791_sample_freq_avail[i], buf)) {
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mutex_lock(&indio_dev->mlock);
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st->filter &= ~AD7791_FILTER_RATE_MASK;
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st->filter |= i;
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ad_sd_write_reg(&st->sd, AD7791_REG_FILTER,
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sizeof(st->filter), st->filter);
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mutex_unlock(&indio_dev->mlock);
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ret = 0;
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break;
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}
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}
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return ret ? ret : len;
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}
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static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
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ad7791_read_frequency,
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ad7791_write_frequency);
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("120 100 33.3 20 16.7 16.6 13.3 9.5");
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static struct attribute *ad7791_attributes[] = {
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&iio_dev_attr_sampling_frequency.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group ad7791_attribute_group = {
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.attrs = ad7791_attributes,
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};
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static const struct iio_info ad7791_info = {
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.read_raw = &ad7791_read_raw,
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.attrs = &ad7791_attribute_group,
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.validate_trigger = ad_sd_validate_trigger,
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.driver_module = THIS_MODULE,
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};
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|
|
||||||
|
static const struct iio_info ad7791_no_filter_info = {
|
||||||
|
.read_raw = &ad7791_read_raw,
|
||||||
|
.validate_trigger = ad_sd_validate_trigger,
|
||||||
|
.driver_module = THIS_MODULE,
|
||||||
|
};
|
||||||
|
|
||||||
|
static int __devinit ad7791_setup(struct ad7791_state *st,
|
||||||
|
struct ad7791_platform_data *pdata)
|
||||||
|
{
|
||||||
|
/* Set to poweron-reset default values */
|
||||||
|
st->mode = AD7791_MODE_BUFFER;
|
||||||
|
st->filter = AD7791_FILTER_RATE_16_6;
|
||||||
|
|
||||||
|
if (!pdata)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
if ((st->info->flags & AD7791_FLAG_HAS_BUFFER) && !pdata->buffered)
|
||||||
|
st->mode &= ~AD7791_MODE_BUFFER;
|
||||||
|
|
||||||
|
if ((st->info->flags & AD7791_FLAG_HAS_BURNOUT) &&
|
||||||
|
pdata->burnout_current)
|
||||||
|
st->mode |= AD7791_MODE_BURNOUT;
|
||||||
|
|
||||||
|
if ((st->info->flags & AD7791_FLAG_HAS_UNIPOLAR) && pdata->unipolar)
|
||||||
|
st->mode |= AD7791_MODE_UNIPOLAR;
|
||||||
|
|
||||||
|
return ad_sd_write_reg(&st->sd, AD7791_REG_MODE, sizeof(st->mode),
|
||||||
|
st->mode);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int __devinit ad7791_probe(struct spi_device *spi)
|
||||||
|
{
|
||||||
|
struct ad7791_platform_data *pdata = spi->dev.platform_data;
|
||||||
|
struct iio_dev *indio_dev;
|
||||||
|
struct ad7791_state *st;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
if (!spi->irq) {
|
||||||
|
dev_err(&spi->dev, "Missing IRQ.\n");
|
||||||
|
return -ENXIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
indio_dev = iio_device_alloc(sizeof(*st));
|
||||||
|
if (!indio_dev)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
st = iio_priv(indio_dev);
|
||||||
|
|
||||||
|
st->reg = regulator_get(&spi->dev, "refin");
|
||||||
|
if (IS_ERR(st->reg)) {
|
||||||
|
ret = PTR_ERR(st->reg);
|
||||||
|
goto err_iio_free;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = regulator_enable(st->reg);
|
||||||
|
if (ret)
|
||||||
|
goto error_put_reg;
|
||||||
|
|
||||||
|
st->info = &ad7791_chip_infos[spi_get_device_id(spi)->driver_data];
|
||||||
|
ad_sd_init(&st->sd, indio_dev, spi, &ad7791_sigma_delta_info);
|
||||||
|
|
||||||
|
spi_set_drvdata(spi, indio_dev);
|
||||||
|
|
||||||
|
indio_dev->dev.parent = &spi->dev;
|
||||||
|
indio_dev->name = spi_get_device_id(spi)->name;
|
||||||
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||||
|
indio_dev->channels = st->info->channels;
|
||||||
|
indio_dev->num_channels = st->info->num_channels;
|
||||||
|
if (st->info->flags & AD7791_FLAG_HAS_FILTER)
|
||||||
|
indio_dev->info = &ad7791_info;
|
||||||
|
else
|
||||||
|
indio_dev->info = &ad7791_no_filter_info;
|
||||||
|
|
||||||
|
ret = ad_sd_setup_buffer_and_trigger(indio_dev);
|
||||||
|
if (ret)
|
||||||
|
goto error_disable_reg;
|
||||||
|
|
||||||
|
ret = ad7791_setup(st, pdata);
|
||||||
|
if (ret)
|
||||||
|
goto error_remove_trigger;
|
||||||
|
|
||||||
|
ret = iio_device_register(indio_dev);
|
||||||
|
if (ret)
|
||||||
|
goto error_remove_trigger;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
error_remove_trigger:
|
||||||
|
ad_sd_cleanup_buffer_and_trigger(indio_dev);
|
||||||
|
error_disable_reg:
|
||||||
|
regulator_disable(st->reg);
|
||||||
|
error_put_reg:
|
||||||
|
regulator_put(st->reg);
|
||||||
|
err_iio_free:
|
||||||
|
iio_device_free(indio_dev);
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int __devexit ad7791_remove(struct spi_device *spi)
|
||||||
|
{
|
||||||
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||||
|
struct ad7791_state *st = iio_priv(indio_dev);
|
||||||
|
|
||||||
|
iio_device_unregister(indio_dev);
|
||||||
|
ad_sd_cleanup_buffer_and_trigger(indio_dev);
|
||||||
|
|
||||||
|
regulator_disable(st->reg);
|
||||||
|
regulator_put(st->reg);
|
||||||
|
|
||||||
|
iio_device_free(indio_dev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct spi_device_id ad7791_spi_ids[] = {
|
||||||
|
{ "ad7787", AD7787 },
|
||||||
|
{ "ad7788", AD7788 },
|
||||||
|
{ "ad7789", AD7789 },
|
||||||
|
{ "ad7790", AD7790 },
|
||||||
|
{ "ad7791", AD7791 },
|
||||||
|
{}
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(spi, ad7791_spi_ids);
|
||||||
|
|
||||||
|
static struct spi_driver ad7791_driver = {
|
||||||
|
.driver = {
|
||||||
|
.name = "ad7791",
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
},
|
||||||
|
.probe = ad7791_probe,
|
||||||
|
.remove = __devexit_p(ad7791_remove),
|
||||||
|
.id_table = ad7791_spi_ids,
|
||||||
|
};
|
||||||
|
module_spi_driver(ad7791_driver);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
||||||
|
MODULE_DESCRIPTION("Analog Device AD7787/AD7788/AD7789/AD7790/AD7791 ADC driver");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
|
|
@ -0,0 +1,17 @@
|
||||||
|
#ifndef __LINUX_PLATFORM_DATA_AD7791__
|
||||||
|
#define __LINUX_PLATFORM_DATA_AD7791__
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct ad7791_platform_data - AD7791 device platform data
|
||||||
|
* @buffered: If set to true configure the device for buffered input mode.
|
||||||
|
* @burnout_current: If set to true the 100mA burnout current is enabled.
|
||||||
|
* @unipolar: If set to true sample in unipolar mode, if set to false sample in
|
||||||
|
* bipolar mode.
|
||||||
|
*/
|
||||||
|
struct ad7791_platform_data {
|
||||||
|
bool buffered;
|
||||||
|
bool burnout_current;
|
||||||
|
bool unipolar;
|
||||||
|
};
|
||||||
|
|
||||||
|
#endif
|
||||||
Loading…
Reference in New Issue