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Message-Id: <20240527154050.24975-3-francesco@dolcini.it>
Date: Mon, 27 May 2024 17:40:50 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Francesco Dolcini <francesco@...cini.it>,
João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: João Paulo Gonçalves <joao.goncalves@...adex.com>,
linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org,
Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: [PATCH v1 2/2] iio: adc: ti-ads1119: Add driver
From: João Paulo Gonçalves <joao.goncalves@...adex.com>
The ADS1119 is a precision, 16-bit, analog-to-digital converter (ADC)
that features two differential or four single-ended inputs through a
flexible input multiplexer (MUX), rail-to-rail input
buffers, a programmable gain stage, a voltage reference, and an
oscillator.
Apart from normal single conversion, the driver also supports
continuous conversion mode using a triggered buffer. However, in this
mode only one channel can be scanned at a time, and it only uses the data
ready interrupt as a trigger. This is because the device channels are
multiplexed, and using its own data ready interrupt as a trigger guarantees
the signal sampling frequency.
Datasheet: https://www.ti.com/lit/gpn/ads1119
Signed-off-by: João Paulo Gonçalves <joao.goncalves@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
MAINTAINERS | 1 +
drivers/iio/adc/Kconfig | 13 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ti-ads1119.c | 815 +++++++++++++++++++++++++++++++++++
4 files changed, 830 insertions(+)
create mode 100644 drivers/iio/adc/ti-ads1119.c
diff --git a/MAINTAINERS b/MAINTAINERS
index f1b2c4b815e2..ab9febe5dc9c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22386,6 +22386,7 @@ M: João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>
L: linux-iio@...r.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/iio/adc/ti,ads1119.yaml
+F: drivers/iio/adc/ti-ads1119.c
TI ADS7924 ADC DRIVER
M: Hugo Villeneuve <hvilleneuve@...onoff.com>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 8db68b80b391..c76c403abf5d 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1329,6 +1329,19 @@ config TI_ADS1015
This driver can also be built as a module. If so, the module will be
called ti-ads1015.
+config TI_ADS1119
+ tristate "Texas Instruments ADS1119 ADC"
+ depends on I2C
+ select REGMAP_I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ If you say yes here you get support for Texas Instruments ADS1119
+ ADC chip.
+
+ This driver can also be built as a module. If so, the module will be
+ called ti-ads1119.
+
config TI_ADS7924
tristate "Texas Instruments ADS7924 ADC"
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index edb32ce2af02..80bd6783640e 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o
obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o
obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o
obj-$(CONFIG_TI_ADS1100) += ti-ads1100.o
+obj-$(CONFIG_TI_ADS1119) += ti-ads1119.o
obj-$(CONFIG_TI_ADS1298) += ti-ads1298.o
obj-$(CONFIG_TI_ADS7924) += ti-ads7924.o
obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o
diff --git a/drivers/iio/adc/ti-ads1119.c b/drivers/iio/adc/ti-ads1119.c
new file mode 100644
index 000000000000..bcc1877b686f
--- /dev/null
+++ b/drivers/iio/adc/ti-ads1119.c
@@ -0,0 +1,815 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Texas Instruments ADS1119 ADC driver.
+ *
+ * Copyright 2024 Toradex
+ */
+
+#include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/math.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#define ADS1119_DRIVER "ads1119"
+
+#define ADS1119_CMD_RESET 0x06
+#define ADS1119_CMD_POWERDOWN 0x02
+#define ADS1119_CMD_START_SYNC 0x08
+#define ADS1119_CMD_RDATA 0x10
+#define ADS1119_CMD_RREG_CONFIG 0x20
+#define ADS1119_CMD_RREG_STATUS 0x24
+#define ADS1119_CMD_WREG 0x40
+
+#define ADS1119_CMD_RREG(reg) (0x20 | ((reg) << 2))
+
+/* Config register */
+#define ADS1119_REG_CONFIG 0x00
+#define ADS1119_CONFIG_VREF(val) (val)
+#define ADS1119_CONFIG_VREF_MASK BIT(0)
+#define ADS1119_CONFIG_CONV_MODE(val) ((val) << 1)
+#define ADS1119_CONFIG_CM_MASK BIT(1)
+#define ADS1119_CONFIG_DATARATE(val) ((val) << 2)
+#define ADS1119_CONFIG_DR_MASK GENMASK(3, 2)
+#define ADS1119_CONFIG_GAIN(val) ((val) << 4)
+#define ADS1119_CONFIG_GAIN_MASK BIT(4)
+#define ADS1119_CONFIG_MUX(val) ((val) << 5)
+#define ADS1119_CONFIG_MUX_MASK GENMASK(7, 5)
+
+#define ADS1119_VREF_INTERNAL 0
+#define ADS1119_VREF_EXTERNAL 1
+
+#define ADS1119_CM_SINGLE 0
+#define ADS1119_CM_CONTINUOUS 1
+
+#define ADS1119_DR_20_SPS 0
+#define ADS1119_DR_90_SPS 1
+#define ADS1119_DR_330_SPS 2
+#define ADS1119_DR_1000_SPS 3
+
+#define ADS1119_GAIN_1 0
+#define ADS1119_GAIN_4 1
+
+#define ADS1119_MUX_AIN0_AIN1 0
+#define ADS1119_MUX_AIN2_AIN3 1
+#define ADS1119_MUX_AIN1_AIN2 2
+#define ADS1119_MUX_AIN0 3
+#define ADS1119_MUX_AIN1 4
+#define ADS1119_MUX_AIN2 5
+#define ADS1119_MUX_AIN3 6
+#define ADS1119_MUX_SHORTED 7
+
+/* Status register */
+#define ADS1119_REG_STATUS 0x01
+#define ADS1119_STATUS_DRDY_MASK BIT(7)
+
+#define ADS1119_DEFAULT_GAIN 1
+#define ADS1119_DEFAULT_DATARATE 20
+
+#define ADS1119_SUSPEND_DELAY 2000
+
+/* Timeout based on the minimum sample rate of 20 SPS (50000us) */
+#define ADS1119_MAX_DRDY_TIMEOUT 85000
+
+/*
+ * Static allocate buffer for scans assuming one channel sample (2 or 4 bytes)
+ * + timestamp (8 bytes).
+ */
+#define ADS1119_SCAN_BUFFER_SIZE 12
+
+struct ads1119_data {
+ const struct iio_chan_spec *channels;
+ const struct iio_info *info;
+ const unsigned long *available_scan_masks;
+ int num_channels;
+ int vref_internal_uv;
+};
+
+struct ads1119_channel_config {
+ int gain;
+ int datarate;
+};
+
+struct ads1119_state {
+ struct i2c_client *client;
+ struct gpio_desc *reset_gpio;
+ struct iio_trigger *trig;
+ struct regmap *regmap;
+ struct regulator *vref;
+ const struct ads1119_data *data;
+ struct completion completion;
+ u8 scan_buf[ADS1119_SCAN_BUFFER_SIZE];
+ struct ads1119_channel_config *channels_cfg;
+ unsigned int num_bytes_sample;
+};
+
+static const unsigned long ads1119_available_scan_masks[] = {
+ BIT(ADS1119_MUX_AIN0_AIN1),
+ BIT(ADS1119_MUX_AIN2_AIN3),
+ BIT(ADS1119_MUX_AIN1_AIN2),
+ BIT(ADS1119_MUX_AIN0),
+ BIT(ADS1119_MUX_AIN1),
+ BIT(ADS1119_MUX_AIN2),
+ BIT(ADS1119_MUX_AIN3),
+ 0
+};
+
+static int ads1119_cmd(struct ads1119_state *st, unsigned int cmd)
+{
+ dev_dbg(&st->client->dev, "send command: %#x\n", cmd);
+
+ return i2c_smbus_write_byte(st->client, cmd);
+}
+
+static int ads1119_cmd_wreg(struct ads1119_state *st, unsigned int val)
+{
+ dev_dbg(&st->client->dev, "wreg: %#x\n", val);
+
+ return i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG, val);
+}
+
+static int ads1119_cmd_rreg(struct ads1119_state *st, unsigned int cmd,
+ unsigned int *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(st->client, cmd);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&st->client->dev, "rreg %#x: %#x\n", cmd, ret);
+
+ *val = ret;
+
+ return 0;
+}
+
+static int ads1119_cmd_rdata(struct ads1119_state *st, unsigned int *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&st->client->dev, "rdata: %#x\n", ret);
+
+ *val = ret;
+
+ return 0;
+}
+
+static bool ads1119_writeable_reg(struct device *dev, unsigned int reg)
+{
+ return (reg == ADS1119_REG_CONFIG);
+}
+
+static int ads1119_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ return ads1119_cmd_rreg(context, ADS1119_CMD_RREG(reg), val);
+}
+
+static int ads1119_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ return ads1119_cmd_wreg(context, val);
+}
+
+static const struct regmap_config ads1119_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_write = ads1119_reg_write,
+ .reg_read = ads1119_reg_read,
+ .max_register = ADS1119_REG_STATUS,
+ .writeable_reg = ads1119_writeable_reg,
+};
+
+static int ads1119_reset(struct ads1119_state *st)
+{
+ if (!st->reset_gpio)
+ return ads1119_cmd(st, ADS1119_CMD_RESET);
+
+ gpiod_set_value_cansleep(st->reset_gpio, 1);
+ udelay(1);
+ gpiod_set_value_cansleep(st->reset_gpio, 0);
+ udelay(1);
+
+ return 0;
+}
+
+static int ads1119_set_mux(struct ads1119_state *st, unsigned int mux)
+{
+ return regmap_update_bits(st->regmap, ADS1119_REG_CONFIG,
+ ADS1119_CONFIG_MUX_MASK,
+ ADS1119_CONFIG_MUX(mux));
+}
+
+static int ads1119_set_gain(struct ads1119_state *st, int gain)
+{
+ switch (gain) {
+ case 1:
+ gain = ADS1119_GAIN_1;
+ break;
+ case 4:
+ gain = ADS1119_GAIN_4;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(st->regmap, ADS1119_REG_CONFIG,
+ ADS1119_CONFIG_GAIN_MASK,
+ ADS1119_CONFIG_GAIN(gain));
+}
+
+static int ads1119_set_datarate(struct ads1119_state *st, int datarate)
+{
+ switch (datarate) {
+ case 20:
+ datarate = ADS1119_DR_20_SPS;
+ break;
+ case 90:
+ datarate = ADS1119_DR_90_SPS;
+ break;
+ case 330:
+ datarate = ADS1119_DR_330_SPS;
+ break;
+ case 1000:
+ datarate = ADS1119_DR_1000_SPS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(st->regmap, ADS1119_REG_CONFIG,
+ ADS1119_CONFIG_DR_MASK,
+ ADS1119_CONFIG_DATARATE(datarate));
+}
+
+static int ads1119_set_conv_mode(struct ads1119_state *st, bool continuous)
+{
+ unsigned int mode;
+
+ if (continuous)
+ mode = ADS1119_CM_CONTINUOUS;
+ else
+ mode = ADS1119_CM_SINGLE;
+
+ return regmap_update_bits(st->regmap, ADS1119_REG_CONFIG,
+ ADS1119_CONFIG_CM_MASK,
+ ADS1119_CONFIG_CONV_MODE(mode));
+}
+
+static int ads1119_configure_channel(struct ads1119_state *st, unsigned int mux,
+ int gain, int datarate)
+{
+ int ret;
+
+ ret = ads1119_set_mux(st, mux);
+ if (ret)
+ return ret;
+
+ ret = ads1119_set_gain(st, gain);
+ if (ret)
+ return ret;
+
+ ret = ads1119_set_datarate(st, datarate);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ads1119_set_power(struct ads1119_state *st, bool on)
+{
+ struct device *dev = &st->client->dev;
+ int ret;
+
+ if (on) {
+ ret = pm_runtime_resume_and_get(dev);
+ } else {
+ pm_runtime_mark_last_busy(dev);
+ ret = pm_runtime_put_autosuspend(dev);
+ }
+
+ return ret;
+}
+
+static int ads1119_poll_data_ready(struct ads1119_state *st,
+ struct iio_chan_spec const *chan)
+{
+ unsigned int datarate = st->channels_cfg[chan->address].datarate;
+ unsigned long wait_time;
+ unsigned int status;
+
+ /* Sleep between poll half of the data rate */
+ wait_time = DIV_ROUND_CLOSEST(1000000, 2 * datarate);
+
+ return regmap_read_poll_timeout(st->regmap,
+ ADS1119_REG_STATUS,
+ status,
+ (status & ADS1119_STATUS_DRDY_MASK) == ADS1119_STATUS_DRDY_MASK,
+ wait_time,
+ ADS1119_MAX_DRDY_TIMEOUT);
+}
+
+static int ads1119_read_data(struct ads1119_state *st,
+ struct iio_chan_spec const *chan,
+ unsigned int *val)
+{
+ unsigned int timeout;
+ int ret;
+
+ timeout = msecs_to_jiffies(ADS1119_MAX_DRDY_TIMEOUT);
+
+ if (!st->client->irq)
+ ret = ads1119_poll_data_ready(st, chan);
+ else if (!wait_for_completion_timeout(&st->completion, timeout))
+ ret = -ETIMEDOUT;
+ else
+ ret = 0;
+
+ if (!ret)
+ ret = ads1119_cmd_rdata(st, val);
+
+ return ret;
+}
+
+static int ads1119_single_conversion(struct ads1119_state *st,
+ struct iio_chan_spec const *chan,
+ int *val,
+ bool calib_offset)
+{
+ unsigned int mux = chan->address;
+ unsigned int sample;
+ int gain, datarate;
+ int ret;
+
+ gain = st->channels_cfg[mux].gain;
+ datarate = st->channels_cfg[mux].datarate;
+
+ if (calib_offset)
+ mux = ADS1119_MUX_SHORTED;
+
+ ret = ads1119_configure_channel(st, mux, gain, datarate);
+ if (ret)
+ return ret;
+
+ ret = ads1119_set_power(st, true);
+ if (ret)
+ return ret;
+
+ ret = ads1119_cmd(st, ADS1119_CMD_START_SYNC);
+ if (ret)
+ return ret;
+
+ ret = ads1119_read_data(st, chan, &sample);
+ if (ret)
+ return ret;
+
+ ads1119_set_power(st, false);
+
+ *val = sign_extend32(sample, chan->scan_type.realbits - 1);
+
+ return IIO_VAL_INT;
+}
+
+static int ads1119_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct ads1119_state *st = iio_priv(indio_dev);
+ unsigned int index = chan->address;
+ int ret;
+
+ if (index >= ADS1119_MUX_SHORTED)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
+ return ads1119_single_conversion(st, chan, val, false);
+ unreachable();
+ case IIO_CHAN_INFO_OFFSET:
+ iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
+ return ads1119_single_conversion(st, chan, val, true);
+ unreachable();
+ case IIO_CHAN_INFO_SCALE:
+ if (st->vref)
+ ret = regulator_get_voltage(st->vref);
+ else
+ ret = st->data->vref_internal_uv;
+
+ if (ret < 0)
+ return ret;
+
+ *val = ret / 1000;
+ *val /= st->channels_cfg[index].gain;
+ *val2 = chan->scan_type.realbits - 1;
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = st->channels_cfg[index].datarate;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ads1119_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct ads1119_state *st = iio_priv(indio_dev);
+
+ if (readval)
+ return regmap_read(st->regmap, reg, readval);
+
+ return regmap_write(st->regmap, reg, writeval);
+}
+
+#define ADS1119_V_DIFF_CHAN(_chan, _chan2, _addr) { \
+ .type = IIO_VOLTAGE, \
+ .differential = 1, \
+ .indexed = 1, \
+ .address = _addr, \
+ .channel = _chan, \
+ .channel2 = _chan2, \
+ .info_mask_separate = \
+ BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_OFFSET) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .scan_index = _addr, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+ .datasheet_name = "AIN"#_chan"-AIN"#_chan2, \
+}
+
+#define ADS1119_V_CHAN(_chan, _addr) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .address = _addr, \
+ .channel = _chan, \
+ .info_mask_separate = \
+ BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_OFFSET) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .scan_index = _addr, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+ .datasheet_name = "AIN"#_chan, \
+}
+
+static const struct iio_chan_spec ads1119_channels[] = {
+ ADS1119_V_DIFF_CHAN(0, 1, ADS1119_MUX_AIN0_AIN1),
+ ADS1119_V_DIFF_CHAN(2, 3, ADS1119_MUX_AIN2_AIN3),
+ ADS1119_V_DIFF_CHAN(1, 2, ADS1119_MUX_AIN1_AIN2),
+ ADS1119_V_CHAN(0, ADS1119_MUX_AIN0),
+ ADS1119_V_CHAN(1, ADS1119_MUX_AIN1),
+ ADS1119_V_CHAN(2, ADS1119_MUX_AIN2),
+ ADS1119_V_CHAN(3, ADS1119_MUX_AIN3),
+ IIO_CHAN_SOFT_TIMESTAMP(ADS1119_MUX_SHORTED),
+};
+
+static const struct iio_info ads1119_info = {
+ .read_raw = ads1119_read_raw,
+ .debugfs_reg_access = ads1119_debugfs_reg_access,
+};
+
+static int ads1119_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct ads1119_state *st = iio_priv(indio_dev);
+ unsigned int index;
+ int ret;
+
+ index = find_first_bit(indio_dev->active_scan_mask,
+ indio_dev->masklength);
+
+ if (index >= ADS1119_MUX_SHORTED)
+ return -EINVAL;
+
+ st->num_bytes_sample =
+ indio_dev->channels[index].scan_type.storagebits / 8;
+
+ ret = ads1119_set_conv_mode(st, state);
+ if (ret)
+ return ret;
+
+ if (state) {
+ ret = ads1119_configure_channel(st, index,
+ st->channels_cfg[index].gain,
+ st->channels_cfg[index].datarate);
+ if (ret)
+ return ret;
+
+ ret = ads1119_set_power(st, true);
+ if (ret)
+ return ret;
+
+ ret = ads1119_cmd(st, ADS1119_CMD_START_SYNC);
+ } else {
+ ret = ads1119_set_power(st, false);
+ }
+
+ return ret;
+}
+
+static const struct iio_trigger_ops ads1119_trigger_ops = {
+ .set_trigger_state = &ads1119_set_trigger_state,
+ .validate_device = &iio_trigger_validate_own_device,
+};
+
+static irqreturn_t ads1119_irq_handler(int irq, void *dev_id)
+{
+ struct iio_dev *indio_dev = dev_id;
+ struct ads1119_state *st = iio_priv(indio_dev);
+
+ if (iio_buffer_enabled(indio_dev))
+ iio_trigger_poll(indio_dev->trig);
+ else
+ complete(&st->completion);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ads1119_trigger_handler(int irq, void *private)
+{
+ struct iio_poll_func *pf = private;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ads1119_state *st = iio_priv(indio_dev);
+ unsigned int sample;
+ int ret;
+
+ ret = ads1119_cmd_rdata(st, &sample);
+ if (!ret) {
+ memcpy(st->scan_buf, &sample, st->num_bytes_sample);
+ iio_push_to_buffers_with_timestamp(indio_dev, st->scan_buf,
+ iio_get_time_ns(indio_dev));
+ } else {
+ dev_err(&st->client->dev,
+ "Failed to read data on trigger (%d)\n", ret);
+ }
+
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int ads1119_init(struct ads1119_state *st)
+{
+ int ret;
+
+ ret = ads1119_reset(st);
+ if (ret)
+ return ret;
+
+ if (st->vref)
+ return regmap_update_bits(st->regmap, ADS1119_REG_CONFIG,
+ ADS1119_CONFIG_VREF_MASK,
+ ADS1119_CONFIG_VREF(ADS1119_VREF_EXTERNAL));
+ return 0;
+}
+
+static int ads1119_alloc_and_config_channels(struct ads1119_state *st)
+{
+ struct device *dev = &st->client->dev;
+ int num_channels, gain, datarate;
+ struct fwnode_handle *node;
+ int ret, index;
+
+ /* Last channel is not a hw channel (timestamp) */
+ num_channels = st->data->num_channels - 1;
+
+ st->channels_cfg = devm_kcalloc(dev, num_channels,
+ sizeof(*st->channels_cfg),
+ GFP_KERNEL);
+ if (!st->channels_cfg)
+ return -ENOMEM;
+
+ for (index = 0; index < num_channels; index++) {
+ st->channels_cfg[index].gain = ADS1119_DEFAULT_GAIN;
+ st->channels_cfg[index].datarate = ADS1119_DEFAULT_DATARATE;
+ }
+
+ device_for_each_child_node(dev, node) {
+ ret = fwnode_property_read_u32(node, "reg", &index);
+ if (ret) {
+ fwnode_handle_put(node);
+ return dev_err_probe(dev, ret,
+ "Failed to configure channels\n");
+ }
+
+ if (!fwnode_property_read_u32(node, "ti,gain", &gain))
+ st->channels_cfg[index].gain = gain;
+
+ if (!fwnode_property_read_u32(node, "ti,datarate", &datarate))
+ st->channels_cfg[index].datarate = datarate;
+
+ dev_dbg(dev, "channel config %d: gain %d, datarate %d\n",
+ index, st->channels_cfg[index].gain,
+ st->channels_cfg[index].datarate);
+ }
+
+ return 0;
+}
+
+static int ads1119_get_configs(struct ads1119_state *st)
+{
+ struct device *dev = &st->client->dev;
+
+ st->vref = devm_regulator_get_optional(dev, "vref");
+ if (IS_ERR(st->vref))
+ return dev_err_probe(dev, PTR_ERR(st->vref),
+ "Failed to get vref\n");
+
+ st->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(st->reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(st->vref),
+ "Failed to get reset gpio\n");
+
+ return ads1119_alloc_and_config_channels(st);
+}
+
+static void ads1119_disable_vref_regulator(void *data)
+{
+ struct ads1119_state *st = data;
+
+ regulator_disable(st->vref);
+}
+
+static int ads1119_probe(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ struct ads1119_state *st;
+ struct device *dev = &client->dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return dev_err_probe(dev, -ENOMEM,
+ "Failed to allocate IIO device\n");
+
+ st = iio_priv(indio_dev);
+ st->client = client;
+ st->data = i2c_get_match_data(client);
+ if (!st->data)
+ return dev_err_probe(dev, -ENODEV,
+ "Failed to get match data\n");
+
+ indio_dev->name = ADS1119_DRIVER;
+ indio_dev->info = st->data->info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = st->data->channels;
+ indio_dev->num_channels = st->data->num_channels;
+ indio_dev->available_scan_masks = st->data->available_scan_masks;
+
+ i2c_set_clientdata(client, indio_dev);
+
+ ret = ads1119_get_configs(st);
+ if (ret)
+ return ret;
+
+ if (st->vref) {
+ ret = regulator_enable(st->vref);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to enable vref\n");
+
+ ret = devm_add_action_or_reset(dev, ads1119_disable_vref_regulator, st);
+ if (ret)
+ return ret;
+ }
+
+ st->regmap = devm_regmap_init(dev, NULL, st, &ads1119_regmap_config);
+ if (IS_ERR(st->regmap))
+ return dev_err_probe(dev, PTR_ERR(st->regmap),
+ "Failed to allocate register map\n");
+
+ init_completion(&st->completion);
+
+ if (client->irq > 0) {
+ ret = devm_request_threaded_irq(dev,
+ client->irq,
+ ads1119_irq_handler,
+ NULL,
+ IRQF_TRIGGER_FALLING,
+ ADS1119_DRIVER,
+ indio_dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to allocate irq\n");
+
+ st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+ indio_dev->name,
+ iio_device_id(indio_dev));
+ if (!st->trig)
+ return dev_err_probe(dev, -ENOMEM,
+ "Failed to allocate IIO trigger\n");
+
+ st->trig->ops = &ads1119_trigger_ops;
+ iio_trigger_set_drvdata(st->trig, indio_dev);
+
+ ret = devm_iio_trigger_register(dev, st->trig);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to register IIO trigger\n");
+
+ indio_dev->trig = iio_trigger_get(st->trig);
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+ ads1119_trigger_handler,
+ NULL);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to setup IIO buffer\n");
+ }
+
+ ret = ads1119_init(st);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to initialize device\n");
+
+ pm_runtime_set_autosuspend_delay(dev, ADS1119_SUSPEND_DELAY);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_set_active(dev);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to enable pm runtime\n");
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static int ads1119_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct ads1119_state *st = iio_priv(indio_dev);
+
+ return ads1119_cmd(st, ADS1119_CMD_POWERDOWN);
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ads1119_pm_ops,
+ ads1119_runtime_suspend,
+ NULL,
+ NULL);
+
+static const struct ads1119_data ads1119_data = {
+ .channels = ads1119_channels,
+ .num_channels = ARRAY_SIZE(ads1119_channels),
+ .info = &ads1119_info,
+ .available_scan_masks = ads1119_available_scan_masks,
+ .vref_internal_uv = 2048000,
+};
+
+static const struct of_device_id __maybe_unused ads1119_of_match[] = {
+ { .compatible = "ti,ads1119", .data = &ads1119_data, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ads1119_of_match);
+
+static const struct i2c_device_id ads1119_id[] = {
+ { ADS1119_DRIVER, (kernel_ulong_t)&ads1119_data },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ads1119_id);
+
+static struct i2c_driver ads1119_driver = {
+ .driver = {
+ .name = ADS1119_DRIVER,
+ .of_match_table = of_match_ptr(ads1119_of_match),
+ .pm = pm_ptr(&ads1119_pm_ops),
+ },
+ .probe = ads1119_probe,
+ .id_table = ads1119_id,
+};
+module_i2c_driver(ads1119_driver);
+
+MODULE_AUTHOR("João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>");
+MODULE_DESCRIPTION("Texas Instruments ADS1119 ADC Driver");
+MODULE_LICENSE("GPL");
--
2.39.2
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