From: João Paulo Gonçalves <joao.goncalves@xxxxxxxxxxx> 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@xxxxxxxxxxx> Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx> --- v2: - add 2 functions to wr/rd regs values: ads1119_update_config_reg and ads1119_data_ready - add FIELD(PREP, GET) for bitmasks - add driver string inline - add devm_regulator_get_enable_read_voltage to handle external vref - add comment for resume function - add userspace configuration of gain/datarate - changed bitmasks names to FIELD suffix - changed channel allocation to handle diff-channels/single-channel - changed single conversion to power down on error - changed to create scan masks dynamically to avoid warnings - fix ret=0 in ads1119_read_data() - fix irq trigger handler error handling order - removed regmap from code and KCONFIG - removed of_match_ptr() - removed ads1119_get_configs() and put inlined on probe - removed static allocation of iio channels - removed ads1119_set_power() and called it inline on necessary places - removed not necessary bitmasks and macros - removed match data struct - removed set mux/gain/datarate functions and called them inline --- MAINTAINERS | 1 + drivers/iio/adc/Kconfig | 12 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-ads1119.c | 850 +++++++++++++++++++++++++++++++++++ 4 files changed, 864 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@xxxxxxxxx> L: linux-iio@xxxxxxxxxxxxxxx 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@xxxxxxxxxxxx> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 74fecc284f1a..3022b1ac93a0 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1334,6 +1334,18 @@ 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 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 6a8c2da0e707..50cde66790cf 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -120,6 +120,7 @@ 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_ADS124S08) += ti-ads124s08.o obj-$(CONFIG_TI_ADS1298) += ti-ads1298.o obj-$(CONFIG_TI_ADS131E08) += ti-ads131e08.o diff --git a/drivers/iio/adc/ti-ads1119.c b/drivers/iio/adc/ti-ads1119.c new file mode 100644 index 000000000000..ea0573f07279 --- /dev/null +++ b/drivers/iio/adc/ti-ads1119.c @@ -0,0 +1,850 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Texas Instruments ADS1119 ADC driver. + * + * Copyright 2024 Toradex + */ + +#include <linux/bits.h> +#include <linux/bitfield.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/iopoll.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/math.h> +#include <linux/module.h> +#include <linux/pm_runtime.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_CMD_RESET 0x06 +#define ADS1119_CMD_POWERDOWN 0x02 +#define ADS1119_CMD_START_SYNC 0x08 +#define ADS1119_CMD_RDATA 0x10 +#define ADS1119_CMD_RREG(reg) (0x20 | ((reg) << 2)) +#define ADS1119_CMD_WREG 0x40 + +/* Config register */ +#define ADS1119_REG_CONFIG 0x00 +#define ADS1119_CONFIG_VREF_FIELD BIT(0) +#define ADS1119_CONFIG_CM_FIELD BIT(1) +#define ADS1119_CONFIG_DR_FIELD GENMASK(3, 2) +#define ADS1119_CONFIG_GAIN_FIELD BIT(4) +#define ADS1119_CONFIG_MUX_FIELD GENMASK(7, 5) + +#define ADS1119_VREF_INTERNAL 0 +#define ADS1119_VREF_EXTERNAL 1 +#define ADS1119_VREF_INTERNAL_VAL 2048000 + +#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_FIELD 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) + * + _aligned(8) timestamp (8 bytes). + */ +#define ADS1119_SCAN_BUFFER_SIZE 16 + +#define ADS1119_MAX_CHANNELS 7 +#define ADS1119_MAX_SINGLE_CHANNELS 4 + +#define ADS1119_V_CHAN(_chan, _chan2, _addr) { \ + .type = IIO_VOLTAGE, \ + .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), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = _addr, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ +} + +struct ads1119_channel_config { + int gain; + int datarate; + int mux; +}; + +struct ads1119_state { + unsigned long scan_masks[ADS1119_MAX_CHANNELS + 1]; + u8 scan_buf[ADS1119_SCAN_BUFFER_SIZE]; + struct completion completion; + struct i2c_client *client; + struct gpio_desc *reset_gpio; + struct iio_trigger *trig; + struct ads1119_channel_config *channels_cfg; + unsigned int num_bytes_sample; + unsigned int num_channels_cfg; + int vref_uV; +}; + +static const int ads1119_available_datarates[] = { + 20, 90, 330, 1000, +}; + +static const int ads1119_available_gains[] = { + 1, 1, + 1, 4, +}; + +static int ads1119_cmd(struct ads1119_state *st, unsigned int cmd) +{ + dev_dbg(&st->client->dev, "cmd: %#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 reg, + unsigned int *val) +{ + int ret; + + ret = i2c_smbus_read_byte_data(st->client, ADS1119_CMD_RREG(reg)); + if (ret < 0) + return ret; + + dev_dbg(&st->client->dev, "rreg %#x: %#x\n", reg, 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 int ads1119_update_config_reg(struct ads1119_state *st, + unsigned int fields, + unsigned int val) +{ + unsigned int config; + int ret; + + ret = ads1119_cmd_rreg(st, ADS1119_REG_CONFIG, &config); + if (ret) + return ret; + + config &= ~fields; + config |= val; + + return ads1119_cmd_wreg(st, config); +} + +static bool ads1119_data_ready(struct ads1119_state *st) +{ + unsigned int status; + + if (!ads1119_cmd_rreg(st, ADS1119_REG_STATUS, &status)) + return FIELD_GET(ADS1119_STATUS_DRDY_FIELD, status); + + return 0; +} + +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_conv_mode(struct ads1119_state *st, bool continuous) +{ + unsigned int mode; + + if (continuous) + mode = ADS1119_CM_CONTINUOUS; + else + mode = ADS1119_CM_SINGLE; + + return ads1119_update_config_reg(st, + ADS1119_CONFIG_CM_FIELD, + FIELD_PREP(ADS1119_CONFIG_CM_FIELD, mode)); +} + +static int ads1119_get_hw_gain(int gain) +{ + if (gain == 4) + return ADS1119_GAIN_4; + else + return ADS1119_GAIN_1; +} + +static int ads1119_get_hw_datarate(int datarate) +{ + switch (datarate) { + case 90: + datarate = ADS1119_DR_90_SPS; + break; + case 330: + datarate = ADS1119_DR_330_SPS; + break; + case 1000: + datarate = ADS1119_DR_1000_SPS; + break; + case 20: + default: + datarate = ADS1119_DR_20_SPS; + break; + } + + return datarate; +} + +static int ads1119_configure_channel(struct ads1119_state *st, int mux, + int gain, int datarate) +{ + int ret; + + ret = ads1119_update_config_reg(st, + ADS1119_CONFIG_MUX_FIELD, + FIELD_PREP(ADS1119_CONFIG_MUX_FIELD, mux)); + if (ret) + return ret; + + ret = ads1119_update_config_reg(st, + ADS1119_CONFIG_GAIN_FIELD, + FIELD_PREP(ADS1119_CONFIG_GAIN_FIELD, + ads1119_get_hw_gain(gain))); + if (ret) + return ret; + + return ads1119_update_config_reg(st, + ADS1119_CONFIG_DR_FIELD, + FIELD_PREP(ADS1119_CONFIG_DR_FIELD, + ads1119_get_hw_datarate(datarate))); +} + +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; + bool data_ready; + + /* Sleep between poll half of the data rate */ + wait_time = DIV_ROUND_CLOSEST(1000000, 2 * datarate); + + return read_poll_timeout(ads1119_data_ready, + data_ready, + (data_ready == true), + wait_time, + ADS1119_MAX_DRDY_TIMEOUT, + false, + st); +} + +static int ads1119_read_data(struct ads1119_state *st, + struct iio_chan_spec const *chan, + unsigned int *val) +{ + unsigned int timeout; + int ret = 0; + + 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; + + if (ret) + return ret; + + return ads1119_cmd_rdata(st, val); +} + +static int ads1119_single_conversion(struct ads1119_state *st, + struct iio_chan_spec const *chan, + int *val, + bool calib_offset) +{ + struct device *dev = &st->client->dev; + int mux, gain, datarate; + unsigned int sample; + int ret; + + mux = st->channels_cfg[chan->address].mux; + gain = st->channels_cfg[chan->address].gain; + datarate = st->channels_cfg[chan->address].datarate; + + if (calib_offset) + mux = ADS1119_MUX_SHORTED; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + goto end; + + ret = ads1119_configure_channel(st, mux, gain, datarate); + if (ret) + goto pdown; + + ret = ads1119_cmd(st, ADS1119_CMD_START_SYNC); + if (ret) + goto pdown; + + ret = ads1119_read_data(st, chan, &sample); + if (ret) + goto pdown; + + *val = sign_extend32(sample, chan->scan_type.realbits - 1); + ret = IIO_VAL_INT; +pdown: + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); +end: + return ret; +} + +static int ads1119_validate_datarate(struct ads1119_state *st, int datarate) +{ + switch (datarate) { + case 20: + case 90: + case 330: + case 1000: + return datarate; + default: + return -EINVAL; + } +} + +static int ads1119_validate_gain(struct ads1119_state *st, int scale, int uscale) +{ + int gain = 1000000 / ((scale * 1000000) + uscale); + + switch (gain) { + case 1: + case 4: + return gain; + default: + return -EINVAL; + } +} + +static int ads1119_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SCALE: + *type = IIO_VAL_FRACTIONAL; + *vals = ads1119_available_gains; + *length = ARRAY_SIZE(ads1119_available_gains); + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *type = IIO_VAL_INT; + *vals = ads1119_available_datarates; + *length = ARRAY_SIZE(ads1119_available_datarates); + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +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; + + if (index >= st->num_channels_cfg) + 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: + *val = st->vref_uV / 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_write_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 >= st->num_channels_cfg) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + ret = ads1119_validate_gain(st, val, val2); + if (ret < 0) + return ret; + + st->channels_cfg[index].gain = ret; + break; + case IIO_CHAN_INFO_SAMP_FREQ: + ret = ads1119_validate_datarate(st, val); + if (ret < 0) + return ret; + + st->channels_cfg[index].datarate = ret; + break; + 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 (reg > ADS1119_REG_STATUS) + return -EINVAL; + + if (readval) + return ads1119_cmd_rreg(st, reg, readval); + + if (reg > ADS1119_REG_CONFIG) + return -EINVAL; + + return ads1119_cmd_wreg(st, writeval); +} + +static const struct iio_info ads1119_info = { + .read_avail = ads1119_read_avail, + .read_raw = ads1119_read_raw, + .write_raw = ads1119_write_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); + struct device *dev = &st->client->dev; + unsigned int index; + int ret; + + index = find_first_bit(indio_dev->active_scan_mask, + indio_dev->masklength); + + if (index >= st->num_channels_cfg) + 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) { + pm_runtime_mark_last_busy(dev); + return pm_runtime_put_autosuspend(dev); + } + + ret = ads1119_configure_channel(st, + st->channels_cfg[index].mux, + st->channels_cfg[index].gain, + st->channels_cfg[index].datarate); + if (ret) + return ret; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + return ret; + + return ads1119_cmd(st, ADS1119_CMD_START_SYNC); +} + +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) { + dev_err(&st->client->dev, + "Failed to read data on trigger (%d)\n", ret); + goto done; + } + + 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)); +done: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + +static int ads1119_init(struct ads1119_state *st, bool vref_external) +{ + int ret; + + ret = ads1119_reset(st); + if (ret) + return ret; + + if (vref_external) + return ads1119_update_config_reg(st, + ADS1119_CONFIG_VREF_FIELD, + FIELD_PREP(ADS1119_CONFIG_VREF_FIELD, + ADS1119_VREF_EXTERNAL)); + return 0; +} + + +static int ads1119_map_analog_inputs_mux(int ain_pos, int ain_neg, bool differential) +{ + if (ain_pos >= ADS1119_MAX_SINGLE_CHANNELS) + return -EINVAL; + + if (!differential) + return ADS1119_MUX_AIN0 + ain_pos; + + if (ain_pos == 0 && ain_neg == 1) + return ADS1119_MUX_AIN0_AIN1; + else if (ain_pos == 1 && ain_neg == 2) + return ADS1119_MUX_AIN1_AIN2; + else if (ain_pos == 2 && ain_neg == 3) + return ADS1119_MUX_AIN2_AIN3; + + return -EINVAL; +} + +static int ads1119_alloc_and_config_channels(struct iio_dev *indio_dev) +{ + const struct iio_chan_spec ads1119_channel = ADS1119_V_CHAN(0, 0, 0); + const struct iio_chan_spec ads1119_timestamp = IIO_CHAN_SOFT_TIMESTAMP(0); + struct ads1119_state *st = iio_priv(indio_dev); + struct iio_chan_spec *iio_channels, *chan; + struct device *dev = &st->client->dev; + unsigned int num_channels, i; + bool differential; + u32 ain[2]; + int ret; + + st->num_channels_cfg = device_get_child_node_count(dev); + if (st->num_channels_cfg > ADS1119_MAX_CHANNELS) + return dev_err_probe(dev, -EINVAL, + "Too many channels %d, max is %d\n", + st->num_channels_cfg, ADS1119_MAX_CHANNELS); + + st->channels_cfg = devm_kcalloc(dev, st->num_channels_cfg, + sizeof(*st->channels_cfg), GFP_KERNEL); + if (!st->channels_cfg) + return -ENOMEM; + + /* Allocate one more iio channel for the timestamp */ + num_channels = st->num_channels_cfg + 1; + iio_channels = devm_kcalloc(dev, num_channels, + sizeof(*iio_channels), + GFP_KERNEL); + if (!iio_channels) + return -ENOMEM; + + i = 0; + + device_for_each_child_node_scoped(dev, child) { + chan = &iio_channels[i]; + + differential = fwnode_property_present(child, "diff-channels"); + if (differential) + ret = fwnode_property_read_u32_array(child, "diff-channels", ain, 2); + else + ret = fwnode_property_read_u32(child, "single-channel", &ain[0]); + + if (ret) + return dev_err_probe(dev, ret, + "Failed to get channel property\n"); + + ret = ads1119_map_analog_inputs_mux(ain[0], ain[1], differential); + if (ret < 0) + return dev_err_probe(dev, ret, "Invalid channel value\n"); + + st->channels_cfg[i].mux = ret; + st->channels_cfg[i].gain = ADS1119_DEFAULT_GAIN; + st->channels_cfg[i].datarate = ADS1119_DEFAULT_DATARATE; + st->scan_masks[i] = BIT(i); + + *chan = ads1119_channel; + chan->channel = ain[0]; + chan->address = i; + chan->scan_index = i; + + if (differential) { + chan->channel2 = ain[1]; + chan->differential = 1; + } + + dev_dbg(dev, "channel: index %d, mux %d\n", i, st->channels_cfg[i].mux); + + i++; + } + + iio_channels[i] = ads1119_timestamp; + iio_channels[i].address = i; + iio_channels[i].scan_index = i; + + indio_dev->channels = iio_channels; + indio_dev->num_channels = num_channels; + indio_dev->available_scan_masks = st->scan_masks; + + return 0; +} + +static int ads1119_probe(struct i2c_client *client) +{ + struct iio_dev *indio_dev; + struct ads1119_state *st; + struct device *dev = &client->dev; + bool vref_external = true; + 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; + + indio_dev->name = "ads1119"; + indio_dev->info = &ads1119_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + i2c_set_clientdata(client, indio_dev); + + st->vref_uV = devm_regulator_get_enable_read_voltage(dev, "vref"); + if (st->vref_uV == -ENODEV) { + vref_external = false; + st->vref_uV = ADS1119_VREF_INTERNAL_VAL; + } else if (st->vref_uV < 0) { + return dev_err_probe(dev, st->vref_uV, "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->reset_gpio), + "Failed to get reset gpio\n"); + + ret = ads1119_alloc_and_config_channels(indio_dev); + if (ret) + return ret; + + init_completion(&st->completion); + + if (client->irq > 0) { + ret = devm_request_threaded_irq(dev, + client->irq, + ads1119_irq_handler, + NULL, + IRQF_TRIGGER_FALLING, + "ads1119", + 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, vref_external); + 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); +} + +/* + * The ADS1119 does not require a resume function because it automatically powers + * on after a reset. + * After a power down command, the ADS1119 can still communicate but turns off its + * analog parts. To resume from power down, the device will power up again + * upon receiving a start/sync command. + */ +static DEFINE_RUNTIME_DEV_PM_OPS(ads1119_pm_ops, + ads1119_runtime_suspend, + NULL, + NULL); + + +static const struct of_device_id __maybe_unused ads1119_of_match[] = { + { .compatible = "ti,ads1119" }, + { } +}; +MODULE_DEVICE_TABLE(of, ads1119_of_match); + +static const struct i2c_device_id ads1119_id[] = { + { "ads1119", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ads1119_id); + +static struct i2c_driver ads1119_driver = { + .driver = { + .name = "ads1119", + .of_match_table = 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 <joao.goncalves@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments ADS1119 ADC Driver"); +MODULE_LICENSE("GPL"); -- 2.39.2
