The driver is now at a reasonable quality level. Move it out of staging.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
To compile this driver as a module, choose M here: the
module will be called ad7923.
+config AD799X
+ tristate "Analog Devices AD799x ADC driver"
+ depends on I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say yes here to build support for Analog Devices:
+ ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998
+ i2c analog to digital converters (ADC). Provides direct access
+ via sysfs.
+
config AT91_ADC
tristate "Atmel AT91 ADC"
depends on ARCH_AT91
obj-$(CONFIG_AD7791) += ad7791.o
obj-$(CONFIG_AD7793) += ad7793.o
obj-$(CONFIG_AD7887) += ad7887.o
+obj-$(CONFIG_AD799X) += ad799x.o
obj-$(CONFIG_AT91_ADC) += at91_adc.o
obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
--- /dev/null
+/*
+ * iio/adc/ad799x.c
+ * Copyright (C) 2010-2011 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/events.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define AD799X_CHANNEL_SHIFT 4
+#define AD799X_STORAGEBITS 16
+/*
+ * 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_REG(x) ((x) * 3 + 0x4)
+#define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5)
+#define AD7998_HYST_REG(x) ((x) * 3 + 0x6)
+
+#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_chip_info - chip specifc information
+ * @channel: channel specification
+ * @num_channels: number of channels
+ * @monitor_mode: whether the chip supports monitor interrupts
+ * @default_config: device default configuration
+ * @event_attrs: pointer to the monitor event attribute group
+ */
+struct ad799x_chip_info {
+ struct iio_chan_spec channel[9];
+ int num_channels;
+ u16 default_config;
+ const struct iio_info *info;
+};
+
+struct ad799x_state {
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct regulator *reg;
+ struct regulator *vref;
+ unsigned id;
+ u16 config;
+
+ u8 *rx_buf;
+ unsigned int transfer_size;
+};
+
+/**
+ * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ **/
+static irqreturn_t ad799x_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad799x_state *st = iio_priv(indio_dev);
+ int b_sent;
+ u8 cmd;
+
+ switch (st->id) {
+ case ad7991:
+ case ad7995:
+ case ad7999:
+ cmd = st->config |
+ (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
+ break;
+ case ad7992:
+ case ad7993:
+ case ad7994:
+ cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
+ AD7998_CONV_RES_REG;
+ break;
+ case ad7997:
+ case ad7998:
+ cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
+ break;
+ default:
+ cmd = 0;
+ }
+
+ b_sent = i2c_smbus_read_i2c_block_data(st->client,
+ cmd, st->transfer_size, st->rx_buf);
+ if (b_sent < 0)
+ goto out;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
+ iio_get_time_ns());
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * 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_swapped(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = (u16)ret;
+
+ return 0;
+}
+
+static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = (u8)ret;
+
+ return 0;
+}
+
+static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_write_word_swapped(client, reg, data);
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_write_byte_data(client, reg, data);
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct ad799x_state *st = iio_priv(indio_dev);
+
+ kfree(st->rx_buf);
+ st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (!st->rx_buf)
+ return -ENOMEM;
+
+ st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
+
+ switch (st->id) {
+ case ad7997:
+ case ad7998:
+ return ad799x_i2c_write16(st, AD7998_CONF_REG,
+ st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
+ default:
+ break;
+ }
+
+ 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);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+ if (iio_buffer_enabled(indio_dev))
+ ret = -EBUSY;
+ else
+ ret = ad799x_scan_direct(st, chan->scan_index);
+ 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:
+ ret = regulator_get_voltage(st->vref);
+ if (ret < 0)
+ return ret;
+ *val = ret / 1000;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+}
+static const unsigned int ad7998_frequencies[] = {
+ [AD7998_CYC_DIS] = 0,
+ [AD7998_CYC_TCONF_32] = 15625,
+ [AD7998_CYC_TCONF_64] = 7812,
+ [AD7998_CYC_TCONF_128] = 3906,
+ [AD7998_CYC_TCONF_512] = 976,
+ [AD7998_CYC_TCONF_1024] = 488,
+ [AD7998_CYC_TCONF_2048] = 244,
+};
+static ssize_t ad799x_read_frequency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad799x_state *st = iio_priv(indio_dev);
+
+ int ret;
+ u8 val;
+ ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
+ if (ret)
+ return ret;
+
+ val &= AD7998_CYC_MASK;
+
+ return sprintf(buf, "%u\n", ad7998_frequencies[val]);
+}
+
+static ssize_t ad799x_write_frequency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad799x_state *st = iio_priv(indio_dev);
+
+ long val;
+ int ret, i;
+ u8 t;
+
+ ret = kstrtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&indio_dev->mlock);
+ ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
+ if (ret)
+ goto error_ret_mutex;
+ /* Wipe the bits clean */
+ t &= ~AD7998_CYC_MASK;
+
+ for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
+ if (val == ad7998_frequencies[i])
+ break;
+ if (i == ARRAY_SIZE(ad7998_frequencies)) {
+ ret = -EINVAL;
+ goto error_ret_mutex;
+ }
+ t |= i;
+ ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
+
+error_ret_mutex:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+}
+
+static int ad799x_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ return 1;
+}
+
+static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
+ enum iio_event_direction dir,
+ enum iio_event_info info)
+{
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ if (dir == IIO_EV_DIR_FALLING)
+ return AD7998_DATALOW_REG(chan->channel);
+ else
+ return AD7998_DATAHIGH_REG(chan->channel);
+ case IIO_EV_INFO_HYSTERESIS:
+ return AD7998_HYST_REG(chan->channel);
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ad799x_write_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ int ret;
+ struct ad799x_state *st = iio_priv(indio_dev);
+
+ mutex_lock(&indio_dev->mlock);
+ ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
+ val);
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+static int ad799x_read_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ int ret;
+ struct ad799x_state *st = iio_priv(indio_dev);
+ u16 valin;
+
+ mutex_lock(&indio_dev->mlock);
+ ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
+ &valin);
+ mutex_unlock(&indio_dev->mlock);
+ if (ret < 0)
+ return ret;
+ *val = valin;
+
+ return IIO_VAL_INT;
+}
+
+static irqreturn_t ad799x_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct ad799x_state *st = iio_priv(private);
+ u8 status;
+ int i, ret;
+
+ ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
+ if (ret)
+ goto done;
+
+ if (!status)
+ goto done;
+
+ ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
+
+ for (i = 0; i < 8; i++) {
+ if (status & (1 << i))
+ iio_push_event(indio_dev,
+ i & 0x1 ?
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ (i >> 1),
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING) :
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+ (i >> 1),
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ iio_get_time_ns());
+ }
+
+done:
+ return IRQ_HANDLED;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+ ad799x_read_frequency,
+ ad799x_write_frequency);
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
+
+static struct attribute *ad799x_event_attributes[] = {
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad799x_event_attrs_group = {
+ .attrs = ad799x_event_attributes,
+ .name = "events",
+};
+
+static const struct iio_info ad7991_info = {
+ .read_raw = &ad799x_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static const struct iio_info ad7993_4_7_8_info = {
+ .read_raw = &ad799x_read_raw,
+ .event_attrs = &ad799x_event_attrs_group,
+ .read_event_config = &ad799x_read_event_config,
+ .read_event_value = &ad799x_read_event_value,
+ .write_event_value = &ad799x_write_event_value,
+ .driver_module = THIS_MODULE,
+ .update_scan_mode = ad7997_8_update_scan_mode,
+};
+
+static const struct iio_event_spec ad799x_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
+ },
+};
+
+#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = (_index), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = (_index), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (_realbits), \
+ .storagebits = 16, \
+ .shift = 12 - (_realbits), \
+ .endianness = IIO_BE, \
+ }, \
+ .event_spec = _ev_spec, \
+ .num_event_specs = _num_ev_spec, \
+}
+
+#define AD799X_CHANNEL(_index, _realbits) \
+ _AD799X_CHANNEL(_index, _realbits, NULL, 0)
+
+#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
+ _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
+ ARRAY_SIZE(ad799x_events))
+
+static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
+ [ad7991] = {
+ .channel = {
+ AD799X_CHANNEL(0, 12),
+ AD799X_CHANNEL(1, 12),
+ AD799X_CHANNEL(2, 12),
+ AD799X_CHANNEL(3, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ },
+ .num_channels = 5,
+ .info = &ad7991_info,
+ },
+ [ad7995] = {
+ .channel = {
+ AD799X_CHANNEL(0, 10),
+ AD799X_CHANNEL(1, 10),
+ AD799X_CHANNEL(2, 10),
+ AD799X_CHANNEL(3, 10),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ },
+ .num_channels = 5,
+ .info = &ad7991_info,
+ },
+ [ad7999] = {
+ .channel = {
+ AD799X_CHANNEL(0, 8),
+ AD799X_CHANNEL(1, 8),
+ AD799X_CHANNEL(2, 8),
+ AD799X_CHANNEL(3, 8),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ },
+ .num_channels = 5,
+ .info = &ad7991_info,
+ },
+ [ad7992] = {
+ .channel = {
+ AD799X_CHANNEL_WITH_EVENTS(0, 12),
+ AD799X_CHANNEL_WITH_EVENTS(1, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+ },
+ .num_channels = 3,
+ .default_config = AD7998_ALERT_EN,
+ .info = &ad7993_4_7_8_info,
+ },
+ [ad7993] = {
+ .channel = {
+ AD799X_CHANNEL_WITH_EVENTS(0, 10),
+ AD799X_CHANNEL_WITH_EVENTS(1, 10),
+ AD799X_CHANNEL_WITH_EVENTS(2, 10),
+ AD799X_CHANNEL_WITH_EVENTS(3, 10),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ },
+ .num_channels = 5,
+ .default_config = AD7998_ALERT_EN,
+ .info = &ad7993_4_7_8_info,
+ },
+ [ad7994] = {
+ .channel = {
+ AD799X_CHANNEL_WITH_EVENTS(0, 12),
+ AD799X_CHANNEL_WITH_EVENTS(1, 12),
+ AD799X_CHANNEL_WITH_EVENTS(2, 12),
+ AD799X_CHANNEL_WITH_EVENTS(3, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ },
+ .num_channels = 5,
+ .default_config = AD7998_ALERT_EN,
+ .info = &ad7993_4_7_8_info,
+ },
+ [ad7997] = {
+ .channel = {
+ AD799X_CHANNEL_WITH_EVENTS(0, 10),
+ AD799X_CHANNEL_WITH_EVENTS(1, 10),
+ AD799X_CHANNEL_WITH_EVENTS(2, 10),
+ AD799X_CHANNEL_WITH_EVENTS(3, 10),
+ AD799X_CHANNEL(4, 10),
+ AD799X_CHANNEL(5, 10),
+ AD799X_CHANNEL(6, 10),
+ AD799X_CHANNEL(7, 10),
+ IIO_CHAN_SOFT_TIMESTAMP(8),
+ },
+ .num_channels = 9,
+ .default_config = AD7998_ALERT_EN,
+ .info = &ad7993_4_7_8_info,
+ },
+ [ad7998] = {
+ .channel = {
+ AD799X_CHANNEL_WITH_EVENTS(0, 12),
+ AD799X_CHANNEL_WITH_EVENTS(1, 12),
+ AD799X_CHANNEL_WITH_EVENTS(2, 12),
+ AD799X_CHANNEL_WITH_EVENTS(3, 12),
+ AD799X_CHANNEL(4, 12),
+ AD799X_CHANNEL(5, 12),
+ AD799X_CHANNEL(6, 12),
+ AD799X_CHANNEL(7, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(8),
+ },
+ .num_channels = 9,
+ .default_config = AD7998_ALERT_EN,
+ .info = &ad7993_4_7_8_info,
+ },
+};
+
+static int ad799x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct ad799x_state *st;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ st->id = id->driver_data;
+ st->chip_info = &ad799x_chip_info_tbl[st->id];
+ st->config = st->chip_info->default_config;
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+ st->reg = devm_regulator_get(&client->dev, "vcc");
+ if (IS_ERR(st->reg))
+ return PTR_ERR(st->reg);
+ ret = regulator_enable(st->reg);
+ if (ret)
+ return ret;
+ st->vref = devm_regulator_get(&client->dev, "vref");
+ if (IS_ERR(st->vref)) {
+ ret = PTR_ERR(st->vref);
+ goto error_disable_reg;
+ }
+ ret = regulator_enable(st->vref);
+ if (ret)
+ goto error_disable_reg;
+
+ st->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = id->name;
+ indio_dev->info = st->chip_info->info;
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = st->chip_info->channel;
+ indio_dev->num_channels = st->chip_info->num_channels;
+
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ &ad799x_trigger_handler, NULL);
+ if (ret)
+ goto error_disable_reg;
+
+ if (client->irq > 0) {
+ ret = devm_request_threaded_irq(&client->dev,
+ client->irq,
+ NULL,
+ ad799x_event_handler,
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ client->name,
+ indio_dev);
+ if (ret)
+ goto error_cleanup_ring;
+ }
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_cleanup_ring;
+
+ return 0;
+
+error_cleanup_ring:
+ iio_triggered_buffer_cleanup(indio_dev);
+error_disable_reg:
+ if (!IS_ERR(st->vref))
+ regulator_disable(st->vref);
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+
+ return ret;
+}
+
+static int ad799x_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct ad799x_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ iio_triggered_buffer_cleanup(indio_dev);
+ if (!IS_ERR(st->vref))
+ regulator_disable(st->vref);
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+ kfree(st->rx_buf);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad799x_id[] = {
+ { "ad7991", ad7991 },
+ { "ad7995", ad7995 },
+ { "ad7999", ad7999 },
+ { "ad7992", ad7992 },
+ { "ad7993", ad7993 },
+ { "ad7994", ad7994 },
+ { "ad7997", ad7997 },
+ { "ad7998", ad7998 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad799x_id);
+
+static struct i2c_driver ad799x_driver = {
+ .driver = {
+ .name = "ad799x",
+ },
+ .probe = ad799x_probe,
+ .remove = ad799x_remove,
+ .id_table = ad799x_id,
+};
+module_i2c_driver(ad799x_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD799x ADC");
+MODULE_LICENSE("GPL v2");
Say yes here to include parallel interface support on the AD7606
ADC driver.
-config AD799X
- tristate "Analog Devices AD799x ADC driver"
- depends on I2C
- select IIO_BUFFER
- select IIO_TRIGGERED_BUFFER
- help
- Say yes here to build support for Analog Devices:
- ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998
- i2c analog to digital converters (ADC). Provides direct access
- via sysfs.
-
config AD7780
tristate "Analog Devices AD7780 and similar ADCs driver"
depends on SPI
ad7606-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
obj-$(CONFIG_AD7606) += ad7606.o
-ad799x-y := ad799x_core.o
-obj-$(CONFIG_AD799X) += ad799x.o
-
obj-$(CONFIG_AD7291) += ad7291.o
obj-$(CONFIG_AD7780) += ad7780.o
obj-$(CONFIG_AD7816) += ad7816.o
+++ /dev/null
-/*
- * iio/adc/ad799x.c
- * Copyright (C) 2010-2011 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/events.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-
-#define AD799X_CHANNEL_SHIFT 4
-#define AD799X_STORAGEBITS 16
-/*
- * 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_REG(x) ((x) * 3 + 0x4)
-#define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5)
-#define AD7998_HYST_REG(x) ((x) * 3 + 0x6)
-
-#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_chip_info - chip specifc information
- * @channel: channel specification
- * @num_channels: number of channels
- * @monitor_mode: whether the chip supports monitor interrupts
- * @default_config: device default configuration
- * @event_attrs: pointer to the monitor event attribute group
- */
-struct ad799x_chip_info {
- struct iio_chan_spec channel[9];
- int num_channels;
- u16 default_config;
- const struct iio_info *info;
-};
-
-struct ad799x_state {
- struct i2c_client *client;
- const struct ad799x_chip_info *chip_info;
- struct regulator *reg;
- struct regulator *vref;
- unsigned id;
- u16 config;
-
- u8 *rx_buf;
- unsigned int transfer_size;
-};
-
-/**
- * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
- *
- * Currently there is no option in this driver to disable the saving of
- * timestamps within the ring.
- **/
-static irqreturn_t ad799x_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *indio_dev = pf->indio_dev;
- struct ad799x_state *st = iio_priv(indio_dev);
- int b_sent;
- u8 cmd;
-
- switch (st->id) {
- case ad7991:
- case ad7995:
- case ad7999:
- cmd = st->config |
- (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
- break;
- case ad7992:
- case ad7993:
- case ad7994:
- cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
- AD7998_CONV_RES_REG;
- break;
- case ad7997:
- case ad7998:
- cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
- break;
- default:
- cmd = 0;
- }
-
- b_sent = i2c_smbus_read_i2c_block_data(st->client,
- cmd, st->transfer_size, st->rx_buf);
- if (b_sent < 0)
- goto out;
-
- iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
- iio_get_time_ns());
-out:
- iio_trigger_notify_done(indio_dev->trig);
-
- return IRQ_HANDLED;
-}
-
-/*
- * 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_swapped(client, reg);
- if (ret < 0) {
- dev_err(&client->dev, "I2C read error\n");
- return ret;
- }
-
- *data = (u16)ret;
-
- return 0;
-}
-
-static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
-{
- struct i2c_client *client = st->client;
- int ret = 0;
-
- ret = i2c_smbus_read_byte_data(client, reg);
- if (ret < 0) {
- dev_err(&client->dev, "I2C read error\n");
- return ret;
- }
-
- *data = (u8)ret;
-
- return 0;
-}
-
-static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
-{
- struct i2c_client *client = st->client;
- int ret = 0;
-
- ret = i2c_smbus_write_word_swapped(client, reg, data);
- if (ret < 0)
- dev_err(&client->dev, "I2C write error\n");
-
- return ret;
-}
-
-static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
-{
- struct i2c_client *client = st->client;
- int ret = 0;
-
- ret = i2c_smbus_write_byte_data(client, reg, data);
- if (ret < 0)
- dev_err(&client->dev, "I2C write error\n");
-
- return ret;
-}
-
-static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
- const unsigned long *scan_mask)
-{
- struct ad799x_state *st = iio_priv(indio_dev);
-
- kfree(st->rx_buf);
- st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
- if (!st->rx_buf)
- return -ENOMEM;
-
- st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
-
- switch (st->id) {
- case ad7997:
- case ad7998:
- return ad799x_i2c_write16(st, AD7998_CONF_REG,
- st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
- default:
- break;
- }
-
- 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);
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev))
- ret = -EBUSY;
- else
- ret = ad799x_scan_direct(st, chan->scan_index);
- 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:
- ret = regulator_get_voltage(st->vref);
- if (ret < 0)
- return ret;
- *val = ret / 1000;
- *val2 = chan->scan_type.realbits;
- return IIO_VAL_FRACTIONAL_LOG2;
- }
- return -EINVAL;
-}
-static const unsigned int ad7998_frequencies[] = {
- [AD7998_CYC_DIS] = 0,
- [AD7998_CYC_TCONF_32] = 15625,
- [AD7998_CYC_TCONF_64] = 7812,
- [AD7998_CYC_TCONF_128] = 3906,
- [AD7998_CYC_TCONF_512] = 976,
- [AD7998_CYC_TCONF_1024] = 488,
- [AD7998_CYC_TCONF_2048] = 244,
-};
-static ssize_t ad799x_read_frequency(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad799x_state *st = iio_priv(indio_dev);
-
- int ret;
- u8 val;
- ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
- if (ret)
- return ret;
-
- val &= AD7998_CYC_MASK;
-
- return sprintf(buf, "%u\n", ad7998_frequencies[val]);
-}
-
-static ssize_t ad799x_write_frequency(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad799x_state *st = iio_priv(indio_dev);
-
- long val;
- int ret, i;
- u8 t;
-
- ret = kstrtol(buf, 10, &val);
- if (ret)
- return ret;
-
- mutex_lock(&indio_dev->mlock);
- ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
- if (ret)
- goto error_ret_mutex;
- /* Wipe the bits clean */
- t &= ~AD7998_CYC_MASK;
-
- for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
- if (val == ad7998_frequencies[i])
- break;
- if (i == ARRAY_SIZE(ad7998_frequencies)) {
- ret = -EINVAL;
- goto error_ret_mutex;
- }
- t |= i;
- ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
-
-error_ret_mutex:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-
-static int ad799x_read_event_config(struct iio_dev *indio_dev,
- const struct iio_chan_spec *chan,
- enum iio_event_type type,
- enum iio_event_direction dir)
-{
- return 1;
-}
-
-static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
- enum iio_event_direction dir,
- enum iio_event_info info)
-{
- switch (info) {
- case IIO_EV_INFO_VALUE:
- if (dir == IIO_EV_DIR_FALLING)
- return AD7998_DATALOW_REG(chan->channel);
- else
- return AD7998_DATAHIGH_REG(chan->channel);
- case IIO_EV_INFO_HYSTERESIS:
- return AD7998_HYST_REG(chan->channel);
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int ad799x_write_event_value(struct iio_dev *indio_dev,
- const struct iio_chan_spec *chan,
- enum iio_event_type type,
- enum iio_event_direction dir,
- enum iio_event_info info,
- int val, int val2)
-{
- int ret;
- struct ad799x_state *st = iio_priv(indio_dev);
-
- mutex_lock(&indio_dev->mlock);
- ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
- val);
- mutex_unlock(&indio_dev->mlock);
-
- return ret;
-}
-
-static int ad799x_read_event_value(struct iio_dev *indio_dev,
- const struct iio_chan_spec *chan,
- enum iio_event_type type,
- enum iio_event_direction dir,
- enum iio_event_info info,
- int *val, int *val2)
-{
- int ret;
- struct ad799x_state *st = iio_priv(indio_dev);
- u16 valin;
-
- mutex_lock(&indio_dev->mlock);
- ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
- &valin);
- mutex_unlock(&indio_dev->mlock);
- if (ret < 0)
- return ret;
- *val = valin;
-
- return IIO_VAL_INT;
-}
-
-static irqreturn_t ad799x_event_handler(int irq, void *private)
-{
- struct iio_dev *indio_dev = private;
- struct ad799x_state *st = iio_priv(private);
- u8 status;
- int i, ret;
-
- ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
- if (ret)
- goto done;
-
- if (!status)
- goto done;
-
- ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
-
- for (i = 0; i < 8; i++) {
- if (status & (1 << i))
- iio_push_event(indio_dev,
- i & 0x1 ?
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- (i >> 1),
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_RISING) :
- IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
- (i >> 1),
- IIO_EV_TYPE_THRESH,
- IIO_EV_DIR_FALLING),
- iio_get_time_ns());
- }
-
-done:
- return IRQ_HANDLED;
-}
-
-static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
- ad799x_read_frequency,
- ad799x_write_frequency);
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
-
-static struct attribute *ad799x_event_attributes[] = {
- &iio_dev_attr_sampling_frequency.dev_attr.attr,
- &iio_const_attr_sampling_frequency_available.dev_attr.attr,
- NULL,
-};
-
-static struct attribute_group ad799x_event_attrs_group = {
- .attrs = ad799x_event_attributes,
- .name = "events",
-};
-
-static const struct iio_info ad7991_info = {
- .read_raw = &ad799x_read_raw,
- .driver_module = THIS_MODULE,
-};
-
-static const struct iio_info ad7993_4_7_8_info = {
- .read_raw = &ad799x_read_raw,
- .event_attrs = &ad799x_event_attrs_group,
- .read_event_config = &ad799x_read_event_config,
- .read_event_value = &ad799x_read_event_value,
- .write_event_value = &ad799x_write_event_value,
- .driver_module = THIS_MODULE,
- .update_scan_mode = ad7997_8_update_scan_mode,
-};
-
-static const struct iio_event_spec ad799x_events[] = {
- {
- .type = IIO_EV_TYPE_THRESH,
- .dir = IIO_EV_DIR_RISING,
- .mask_separate = BIT(IIO_EV_INFO_VALUE) |
- BIT(IIO_EV_INFO_ENABLE),
- }, {
- .type = IIO_EV_TYPE_THRESH,
- .dir = IIO_EV_DIR_FALLING,
- .mask_separate = BIT(IIO_EV_INFO_VALUE) |
- BIT(IIO_EV_INFO_ENABLE),
- }, {
- .type = IIO_EV_TYPE_THRESH,
- .dir = IIO_EV_DIR_EITHER,
- .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
- },
-};
-
-#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .channel = (_index), \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
- .scan_index = (_index), \
- .scan_type = { \
- .sign = 'u', \
- .realbits = (_realbits), \
- .storagebits = 16, \
- .shift = 12 - (_realbits), \
- .endianness = IIO_BE, \
- }, \
- .event_spec = _ev_spec, \
- .num_event_specs = _num_ev_spec, \
-}
-
-#define AD799X_CHANNEL(_index, _realbits) \
- _AD799X_CHANNEL(_index, _realbits, NULL, 0)
-
-#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
- _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
- ARRAY_SIZE(ad799x_events))
-
-static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
- [ad7991] = {
- .channel = {
- AD799X_CHANNEL(0, 12),
- AD799X_CHANNEL(1, 12),
- AD799X_CHANNEL(2, 12),
- AD799X_CHANNEL(3, 12),
- IIO_CHAN_SOFT_TIMESTAMP(4),
- },
- .num_channels = 5,
- .info = &ad7991_info,
- },
- [ad7995] = {
- .channel = {
- AD799X_CHANNEL(0, 10),
- AD799X_CHANNEL(1, 10),
- AD799X_CHANNEL(2, 10),
- AD799X_CHANNEL(3, 10),
- IIO_CHAN_SOFT_TIMESTAMP(4),
- },
- .num_channels = 5,
- .info = &ad7991_info,
- },
- [ad7999] = {
- .channel = {
- AD799X_CHANNEL(0, 8),
- AD799X_CHANNEL(1, 8),
- AD799X_CHANNEL(2, 8),
- AD799X_CHANNEL(3, 8),
- IIO_CHAN_SOFT_TIMESTAMP(4),
- },
- .num_channels = 5,
- .info = &ad7991_info,
- },
- [ad7992] = {
- .channel = {
- AD799X_CHANNEL_WITH_EVENTS(0, 12),
- AD799X_CHANNEL_WITH_EVENTS(1, 12),
- IIO_CHAN_SOFT_TIMESTAMP(3),
- },
- .num_channels = 3,
- .default_config = AD7998_ALERT_EN,
- .info = &ad7993_4_7_8_info,
- },
- [ad7993] = {
- .channel = {
- AD799X_CHANNEL_WITH_EVENTS(0, 10),
- AD799X_CHANNEL_WITH_EVENTS(1, 10),
- AD799X_CHANNEL_WITH_EVENTS(2, 10),
- AD799X_CHANNEL_WITH_EVENTS(3, 10),
- IIO_CHAN_SOFT_TIMESTAMP(4),
- },
- .num_channels = 5,
- .default_config = AD7998_ALERT_EN,
- .info = &ad7993_4_7_8_info,
- },
- [ad7994] = {
- .channel = {
- AD799X_CHANNEL_WITH_EVENTS(0, 12),
- AD799X_CHANNEL_WITH_EVENTS(1, 12),
- AD799X_CHANNEL_WITH_EVENTS(2, 12),
- AD799X_CHANNEL_WITH_EVENTS(3, 12),
- IIO_CHAN_SOFT_TIMESTAMP(4),
- },
- .num_channels = 5,
- .default_config = AD7998_ALERT_EN,
- .info = &ad7993_4_7_8_info,
- },
- [ad7997] = {
- .channel = {
- AD799X_CHANNEL_WITH_EVENTS(0, 10),
- AD799X_CHANNEL_WITH_EVENTS(1, 10),
- AD799X_CHANNEL_WITH_EVENTS(2, 10),
- AD799X_CHANNEL_WITH_EVENTS(3, 10),
- AD799X_CHANNEL(4, 10),
- AD799X_CHANNEL(5, 10),
- AD799X_CHANNEL(6, 10),
- AD799X_CHANNEL(7, 10),
- IIO_CHAN_SOFT_TIMESTAMP(8),
- },
- .num_channels = 9,
- .default_config = AD7998_ALERT_EN,
- .info = &ad7993_4_7_8_info,
- },
- [ad7998] = {
- .channel = {
- AD799X_CHANNEL_WITH_EVENTS(0, 12),
- AD799X_CHANNEL_WITH_EVENTS(1, 12),
- AD799X_CHANNEL_WITH_EVENTS(2, 12),
- AD799X_CHANNEL_WITH_EVENTS(3, 12),
- AD799X_CHANNEL(4, 12),
- AD799X_CHANNEL(5, 12),
- AD799X_CHANNEL(6, 12),
- AD799X_CHANNEL(7, 12),
- IIO_CHAN_SOFT_TIMESTAMP(8),
- },
- .num_channels = 9,
- .default_config = AD7998_ALERT_EN,
- .info = &ad7993_4_7_8_info,
- },
-};
-
-static int ad799x_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- int ret;
- struct ad799x_state *st;
- struct iio_dev *indio_dev;
-
- indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
- if (indio_dev == NULL)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
- /* this is only used for device removal purposes */
- i2c_set_clientdata(client, indio_dev);
-
- st->id = id->driver_data;
- st->chip_info = &ad799x_chip_info_tbl[st->id];
- st->config = st->chip_info->default_config;
-
- /* TODO: Add pdata options for filtering and bit delay */
-
- st->reg = devm_regulator_get(&client->dev, "vcc");
- if (IS_ERR(st->reg))
- return PTR_ERR(st->reg);
- ret = regulator_enable(st->reg);
- if (ret)
- return ret;
- st->vref = devm_regulator_get(&client->dev, "vref");
- if (IS_ERR(st->vref)) {
- ret = PTR_ERR(st->vref);
- goto error_disable_reg;
- }
- ret = regulator_enable(st->vref);
- if (ret)
- goto error_disable_reg;
-
- st->client = client;
-
- indio_dev->dev.parent = &client->dev;
- indio_dev->name = id->name;
- indio_dev->info = st->chip_info->info;
-
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channel;
- indio_dev->num_channels = st->chip_info->num_channels;
-
- ret = iio_triggered_buffer_setup(indio_dev, NULL,
- &ad799x_trigger_handler, NULL);
- if (ret)
- goto error_disable_reg;
-
- if (client->irq > 0) {
- ret = devm_request_threaded_irq(&client->dev,
- client->irq,
- NULL,
- ad799x_event_handler,
- IRQF_TRIGGER_FALLING |
- IRQF_ONESHOT,
- client->name,
- indio_dev);
- if (ret)
- goto error_cleanup_ring;
- }
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_cleanup_ring;
-
- return 0;
-
-error_cleanup_ring:
- iio_triggered_buffer_cleanup(indio_dev);
-error_disable_reg:
- if (!IS_ERR(st->vref))
- regulator_disable(st->vref);
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
-
- return ret;
-}
-
-static int ad799x_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
- struct ad799x_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
-
- iio_triggered_buffer_cleanup(indio_dev);
- if (!IS_ERR(st->vref))
- regulator_disable(st->vref);
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
- kfree(st->rx_buf);
-
- return 0;
-}
-
-static const struct i2c_device_id ad799x_id[] = {
- { "ad7991", ad7991 },
- { "ad7995", ad7995 },
- { "ad7999", ad7999 },
- { "ad7992", ad7992 },
- { "ad7993", ad7993 },
- { "ad7994", ad7994 },
- { "ad7997", ad7997 },
- { "ad7998", ad7998 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad799x_id);
-
-static struct i2c_driver ad799x_driver = {
- .driver = {
- .name = "ad799x",
- },
- .probe = ad799x_probe,
- .remove = ad799x_remove,
- .id_table = ad799x_id,
-};
-module_i2c_driver(ad799x_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD799x ADC");
-MODULE_LICENSE("GPL v2");
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff