From: "Ismail H. Kose" <ihk...@gmail.com> Add iio driver for DS4422/DS4424 chips that support two/four channel 7-bit Sink/Source Current DAC.
The driver supports device tree and platfrom files for the configurations. Datasheet publicly available at: https://datasheets.maximintegrated.com/en/ds/DS4422-DS4424.pdf Signed-off-by: Ismail Kose <ismail.k...@maximintegrated.com> --- .../devicetree/bindings/iio/dac/ds4424.txt | 41 ++ drivers/iio/dac/Kconfig | 9 + drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ds4424.c | 733 +++++++++++++++++++++ include/linux/iio/dac/ds4424.h | 29 + 5 files changed, 813 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/ds4424.txt create mode 100644 drivers/iio/dac/ds4424.c create mode 100644 include/linux/iio/dac/ds4424.h diff --git a/Documentation/devicetree/bindings/iio/dac/ds4424.txt b/Documentation/devicetree/bindings/iio/dac/ds4424.txt new file mode 100644 index 000000000000..03c1b575a6db --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/ds4424.txt @@ -0,0 +1,41 @@ +Maxim Integrated DS4422/DS4424 DAC device driver + +Required properties: + - compatible: Must be "maxim,ds4422" or "maxim,ds4424" + - reg: Should contain the DAC I2C address + - min_rfs, max_rfs: In order to get the correct processed data values, + these resistor values should be changed to the correct values + that match the user's system resistor values for RFS0 to RFS1. + Resistance values for rfs_resistor are listed in 100 Ohm units; + ie, 800 is 80K. Acceptable RFS values are 40K to 160K. + - ifs_scale: 61000*100 = 6100000 = 100,000,000 * .976/16 + - max_picoamp: Should contain DAC maximum pico amper value. + - rfs_resistor: Should contain reference resistor + - iio map: Should contain IIO Map info + +Optional properties: + - vcc-supply: Power supply us optional. If not defined, driver will ignore it. + +Example: + ds4224@10 { + compatible = "maxim,ds4424"; + reg = <0x10>; /* When A0, A1 pins are ground */ + vcc-supply = "dac_vcc_3v3"; + max-picoamp = <200000000>; /* 200uA */ + ifs-scale = <61000>; + /* In order to get the correct processed data values, + these resistor values should be changed to the correct values that match the + user's system resistor values for RFS0 to RFS1. + Resistance values for rfs_resistor are listed in 100 Ohm units; + ie, 800 is 80K. Acceptable RFS values are 40K to 160K. + */ + min-rfs = <400>; + max-rfs = <1600>; + rfs-resistors = <400 800 1000 1600>; + dac-iio-map = + /* consumer_dev_name, consumer_channel, adc_channel_label */ + "ds4424_dac-consumer-dev_name-1", "ds4424_dac1", "OUT1", + "ds4424_dac-consumer-dev_name-2", "ds4424_dac2", "OUT2", + "ds4424_dac-consumer-dev_name-3", "ds4424_dac3", "OUT3", + "ds4424_dac-consumer-dev_name-4", "ds4424_dac4", "OUT4"; + }; diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index df5abc46cd3f..6f569c0ac88a 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -309,4 +309,13 @@ config VF610_DAC This driver can also be built as a module. If so, the module will be called vf610_dac. +config DAC_DS4424 + tristate "Maxim Integrated DS4422/DS4424 DAC driver" + depends on I2C + help + If you say yes here you get support for Maxim chip DS4422, DS4424. + + This driver can also be built as a module. If so, the module + will be called DAC_DS4424. + endmenu diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 603587cc2f07..fa77510a5538 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -33,3 +33,4 @@ obj-$(CONFIG_MCP4922) += mcp4922.o obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o obj-$(CONFIG_STM32_DAC) += stm32-dac.o obj-$(CONFIG_VF610_DAC) += vf610_dac.o +obj-$(CONFIG_DAC_DS4424) += ds4424.o diff --git a/drivers/iio/dac/ds4424.c b/drivers/iio/dac/ds4424.c new file mode 100644 index 000000000000..d13590a00c79 --- /dev/null +++ b/drivers/iio/dac/ds4424.c @@ -0,0 +1,733 @@ +/* + * Maxim Integrated + * 7-bit, Multi-Channel Sink/Source Current DAC Driver + * Copyright (C) 2017 Maxim Integrated + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/iio/driver.h> +#include <linux/iio/machine.h> +#include <linux/iio/dac/ds4424.h> + +#define DS4424_DAC_ADDR(chan) ((chan) + 0xf8) +#define SOURCE_I 1 +#define SINK_I 0 + +#define PWR_ON true +#define PWR_OFF false + +#define DS4424_CHANNEL(chan) { \ + .type = IIO_CURRENT, \ + .indexed = 1, \ + .output = 1, \ + .channel = chan, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_PROCESSED) | \ + BIT(IIO_CHAN_INFO_SCALE),\ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET), \ + .address = DS4424_DAC_ADDR(chan), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 8, \ + .storagebits = 8, \ + .shift = 0, \ + }, \ +} + +union raw_data { + struct { + u8 dx:7; + u8 source_bit:1; /* 1 is source, 0 is sink */ + }; + u8 bits; +}; + +enum ds4424_device_ids { + ID_DS4422, + ID_DS4424, +}; + +struct ds4424_data { + struct i2c_client *client; + struct mutex lock; + uint16_t raw[DS442X_MAX_DAC_CHANNELS]; +#ifdef CONFIG_PM_SLEEP + uint16_t save[DS442X_MAX_DAC_CHANNELS]; +#endif + uint32_t max_rfs; + uint32_t min_rfs; + uint32_t ifs_scale; + uint32_t max_picoamp; + uint32_t rfs_res[DS442X_MAX_DAC_CHANNELS]; + struct iio_map dac_iio_map[DS442X_MAX_DAC_CHANNELS + 1]; + struct regulator *vcc_reg; + const char *vcc_reg_name; + bool regulator_state; +}; + +static const struct ds4424_pdata ds4424_pdata_default = { + /* .vcc_supply_name = "dac_vdd_3v3", */ + .min_rfs = 400, + .max_rfs = 1600, + .ifs_scale = 61000, /* 61000*100 = 6100000 = 100,000,000 * .976/16 */ + .max_picoamp = 200000000, + .rfs_res = {400, 800, 1000, 1600}, + .dac_iio_map = { + { .consumer_dev_name = "ds4424_dac-consumer-dev_name-1", + .consumer_channel = "ds4424_dac1", + .adc_channel_label = "OUT1" + }, + { + .consumer_dev_name = "ds4424_dac-consumer-dev_name-2", + .consumer_channel = "ds4424_dac2", + .adc_channel_label = "OUT2" + }, + { + .consumer_dev_name = "ds4424_dac-consumer-dev_name-3", + .consumer_channel = "ds4424_dac3", + .adc_channel_label = "OUT3" + }, + { + .consumer_dev_name = "ds4424_dac-consumer-dev_name-4", + .consumer_channel = "ds4424_dac4", + .adc_channel_label = "OUT4" + }, + {}, + }, +}; + +static const struct iio_chan_spec ds4424_channels[] = { + DS4424_CHANNEL(0), + DS4424_CHANNEL(1), + DS4424_CHANNEL(2), + DS4424_CHANNEL(3) +}; + +int ds4424_regulator_onoff(struct iio_dev *indio_dev, bool enable) +{ + struct ds4424_data *data = iio_priv(indio_dev); + int ret = 0; + + if (data->vcc_reg == NULL) + return ret; + + if (data->regulator_state == PWR_OFF && enable == PWR_ON) { + ret = regulator_enable(data->vcc_reg); + if (ret) { + pr_err("%s - enable vcc_reg failed, ret=%d\n", + __func__, ret); + goto done; + } + } else if (data->regulator_state == PWR_ON && enable == PWR_OFF) { + ret = regulator_disable(data->vcc_reg); + if (ret) { + pr_err("%s - disable vcc_reg failed, ret=%d\n", + __func__, ret); + goto done; + } + } + + data->regulator_state = enable; +done: + return ret; +} + +static int ds4424_get_value(struct iio_dev *indio_dev, + int *val, int channel) +{ + struct ds4424_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + u8 outbuf[1]; + u8 inbuf[1]; + int ret; + + if ((channel < 0) && (channel >= indio_dev->num_channels)) + return -EINVAL; + + outbuf[0] = DS4424_DAC_ADDR(channel); + mutex_lock(&data->lock); + ret = i2c_master_send(client, outbuf, 1); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } else if (ret != 1) { + mutex_unlock(&data->lock); + return -EIO; + } + + ret = i2c_master_recv(client, inbuf, 1); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } else if (ret != 1) { + mutex_unlock(&data->lock); + return -EIO; + } + + mutex_unlock(&data->lock); + + *val = inbuf[0]; + return 0; +} + +/* + * DS4432 DAC control register 8 bits + * [7] 0: to sink; 1: to source + * [6:0] steps to sink/source + * bit[7] looks like a sign bit, but the value of the register is + * not a complemental code considering the bit[6:0] is a absolute + * distance from the zero point. + */ + +/* + * val is positive if sourcing + * val is negative if sinking + * val can be -127 to 127 + */ +static int ds4424_set_value(struct iio_dev *indio_dev, + int val, struct iio_chan_spec const *chan) +{ + struct ds4424_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + u8 outbuf[2]; + int ret; + int max_val = ((1 << chan->scan_type.realbits) - 1); + + if (val < 0 || val > max_val) + return -EINVAL; + + if ((chan->channel < 0) + && (chan->channel >= indio_dev->num_channels)) + return -EINVAL; + + outbuf[0] = DS4424_DAC_ADDR(chan->channel); + outbuf[1] = (val & 0xff); + + mutex_lock(&data->lock); + ret = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf)); + mutex_unlock(&data->lock); + + if (ret < 0) + return ret; + else if (ret >= 0 && ret != ARRAY_SIZE(outbuf)) + return -EIO; + + data->raw[chan->channel] = outbuf[1]; + return 0; +} + +static int ds4424_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + union raw_data raw; + int round_up, ret; + struct ds4424_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + /* Raw is processed a little bit + * outputs positive values for sourcing + * and negative values for sinking + */ + ret = ds4424_get_value(indio_dev, val, chan->channel); + if (ret < 0) { + pr_err("%s : ds4424_get_value returned %d\n", + __func__, ret); + return ret; + } + raw.bits = *val; + *val = raw.dx; + if (raw.source_bit == SINK_I) + *val = -*val; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_PROCESSED: + /** + * To get the processed current using the 8-bit raw data: + * bit 7 is a 1 if sourcing current and it's a 0 if sinking + * current. + * The current full scale (Ifs) depends on the Rfs resistor + * value in ohms: + * Ifs = (0.976/Rfs)*(127/16) + * Then the current sourced or sinked can be determined as + * follows: + * I = Ifs * (Dx/127) + * where Dx is the value of the seven bits 6 to 0. + */ + if (data->rfs_res[chan->channel] < data->min_rfs || + data->rfs_res[chan->channel] > data->max_rfs) { + pr_err("%s : rfs_res out of range. rfs_res[%d]: %d\n", + __func__, + chan->channel, + data->rfs_res[chan->channel]); + return -EINVAL; + } + + ret = ds4424_get_value(indio_dev, val, chan->channel); + if (ret < 0) { + pr_err("%s : ds4424_get_value returned %d\n", + __func__, ret); + return ret; + } + raw.bits = *val; + *val = data->ifs_scale * raw.dx * 100; + round_up = data->rfs_res[chan->channel] / 2; + *val = (*val + round_up) / data->rfs_res[chan->channel]; + + if (raw.source_bit == SINK_I) + *val = -*val; + *val = *val * 100; /* picoAmps */ + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + round_up = data->rfs_res[chan->channel] / 2; + /* picoAmps */ + *val = (data->ifs_scale * 10000 + round_up) / + data->rfs_res[chan->channel]; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_OFFSET: + *val = 0; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +/** + * val is positive if sourcing + * val is negative if sinking + */ +static int ds4424_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + union raw_data raw; + struct ds4424_data *data = iio_priv(indio_dev); + int val0, max_val, min_val, tmp_scale; + + if (val2 != 0) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + + max_val = ((1 << chan->scan_type.realbits)/2) - 1; + min_val = -max_val; + if ((val > max_val) || (val < min_val)) + return -EINVAL; + + if (val > 0) { + raw.source_bit = SOURCE_I; + raw.dx = val; + } else { + raw.source_bit = SINK_I; + raw.dx = -val; + } + + return ds4424_set_value(indio_dev, raw.bits, chan); + + case IIO_CHAN_INFO_PROCESSED: /* val input is picoAmps */ + /* val can be 0 to 200,000,000 (200 picoAmps) */ + val0 = val; + raw.source_bit = SOURCE_I; + if (val < 0) { + raw.source_bit = SINK_I; + val = -val; + } + if (val > data->max_picoamp) { + pr_err("%s : Requested current %d ", __func__, val); + pr_err("exceeds %d picoAmps\n", data->max_picoamp); + return -EINVAL; + } + if (data->rfs_res[chan->channel] < data->min_rfs || + data->rfs_res[chan->channel] > data->max_rfs) { + pr_info("%s : Resistor values out of range\n", + __func__); + return -EINVAL; + } + val = val / 1000; + tmp_scale = data->ifs_scale / 10; /* preserve resolution */ + val = (val * data->rfs_res[chan->channel]) / + tmp_scale; + val = (val + 50) / 100; + val2 = ((1 << chan->scan_type.realbits) / 2) - 1; + if (val > val2) { + pr_info("%s : Requested current %d %d", + __func__, val0, val); + pr_info("exceeds maximum. DAC set to maximum %d\n", + val2); + val = val2; + } + raw.dx = val; + return ds4424_set_value(indio_dev, raw.bits, chan); + + default: + return -EINVAL; + } +} + +static int ds4424_verify_chip(struct iio_dev *indio_dev) +{ + int ret = 0, val; + int i; + + usleep_range(1000, 1200); + for (i = 0; i < indio_dev->num_channels; i++) { + ret = ds4424_get_value(indio_dev, &val, i); + if (ret < 0) { + pr_err("%s : read %d, should be 0\n", __func__, ret); + break; + } + } + return ret; +} + +#ifdef CONFIG_PM_SLEEP +static int ds4424_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ds4424_data *data = iio_priv(indio_dev); + int ret = 0; + u32 i; + + for (i = 0; i < indio_dev->num_channels; i++) { + data->save[i] = data->raw[i]; + ret = ds4424_set_value(indio_dev, 0, + &(indio_dev->channels[i])); + if (ret < 0) + return ret; + } + return ret; +} + +static int ds4424_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ds4424_data *data = iio_priv(indio_dev); + int ret = 0; + u32 i; + + for (i = 0; i < indio_dev->num_channels; i++) { + ret = ds4424_set_value(indio_dev, data->save[i], + &(indio_dev->channels[i])); + if (ret < 0) + return ret; + } + return ret; +} + +static SIMPLE_DEV_PM_OPS(ds4424_pm_ops, ds4424_suspend, ds4424_resume); +#define DS4424_PM_OPS (&ds4424_pm_ops) +#else +#define DS4424_PM_OPS NULL +#endif /* CONFIG_PM_SLEEP */ + +static const struct iio_info ds4424_info = { + .read_raw = ds4424_read_raw, + .write_raw = ds4424_write_raw, + .driver_module = THIS_MODULE, +}; + +#ifdef CONFIG_OF +static int ds4424_parse_dt(struct iio_dev *indio_dev) +{ + int ret; + int len; + int num_ch; + int i; + int count; + struct property *prop; + struct ds4424_data *data = iio_priv(indio_dev); + struct device_node *node = indio_dev->dev.parent->of_node; + + if (!node) { + pr_info("%s:%d ds4424 dts not found\n", __func__, __LINE__); + return -ENODEV; + } + + prop = of_find_property(node, "rfs-resistors", &len); + if (!prop) { + pr_err("Invalid rfs-resistor in dt. len: %d\n", len); + return -EINVAL; + } + + if (len != (DS442X_MAX_DAC_CHANNELS * sizeof(uint32_t))) { + pr_err("Invalid rfs-resistor length in dt. len: %d\n", len); + return -EINVAL; + } + + ret = of_property_read_u32_array(node, "rfs-resistors", + data->rfs_res, DS442X_MAX_DAC_CHANNELS); + if (ret < 0) { + pr_err("Reading rfs-resistors from dt failed. ret: %d\n", ret); + return ret; + } + + pr_info("ds4424 rfs-resistors: %d, %d, %d, %d\n", + data->rfs_res[0], data->rfs_res[1], + data->rfs_res[2], data->rfs_res[3]); + + ret = of_property_read_u32(node, "max-rfs", + &data->max_rfs); + if (ret < 0) { + pr_err("Reading max-rfs from dt failed. ret: %d\n", ret); + return ret; + } + + ret = of_property_read_u32(node, "min-rfs", + (u32 *)&data->min_rfs); + if (ret < 0) { + pr_err("Reading min-rfs from dt failed. ret: %d\n", ret); + return ret; + } + + pr_info("ds4424 max-rfs: %d, min-rfs: %d\n", + data->max_rfs, data->min_rfs); + + ret = of_property_read_u32(node, "max-picoamp", + (u32 *)&data->max_picoamp); + if (ret < 0) { + pr_err("Reading max-picoamp from dt failed. ret: %d\n", ret); + return ret; + } + + ret = of_property_read_u32(node, "ifs-scale", + (u32 *)&data->ifs_scale); + if (ret < 0) { + pr_err("Reading ifs-scale from dt failed. ret: %d\n", ret); + return ret; + } + + pr_info("ds4424 max-picoamp: %d, ifs-scale: %d\n", + data->max_picoamp, data->ifs_scale); + + count = of_property_count_strings(node, "dac-iio-map"); + if (count < 0) { + pr_info("dac-iio-map not found in dts\n"); + return count; + } + + ret = of_property_read_string(node, "vcc-supply", &data->vcc_reg_name); + if (ret < 0) { + pr_info("DAC vcc-supply is not available in dts\n"); + data->vcc_reg_name = NULL; + } + + if (count != DS4424_MAX_DAC_CHANNELS * 3 && + count != DS4424_MAX_DAC_CHANNELS * 3) { + pr_info("Incorrect dac-iio-map in dts. count: %d\n", count); + return -EINVAL; + } + + num_ch = count / 3; + for (i = 0; i < num_ch; i++) { + ret = of_property_read_string_index(node, + "dac-iio-map", i * 3, + &data->dac_iio_map[i].consumer_dev_name); + if (ret < 0) { + pr_info("%s:%d\n", __func__, __LINE__); + return ret; + } + + ret = of_property_read_string_index(node, "dac-iio-map", + i * 3 + 1, + &data->dac_iio_map[i].consumer_channel); + if (ret < 0) { + pr_info("%s:%d\n", __func__, __LINE__); + return ret; + } + + ret = of_property_read_string_index(node, "dac-iio-map", + i * 3 + 2, + &data->dac_iio_map[i].adc_channel_label); + if (ret < 0) { + pr_info("%s:%d\n", __func__, __LINE__); + return ret; + } + + pr_info("ds4424 iio-map[%d]: %s, %s, %s\n", i, + data->dac_iio_map[i].consumer_dev_name, + data->dac_iio_map[i].consumer_channel, + data->dac_iio_map[i].adc_channel_label); + } + + return 0; +} +#else +static int ds4424_parse_dt(struct iio_dev *indio_dev) +{ + return -ENODEV; +} +#endif + +static int ds4424_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + const struct ds4424_pdata *pdata; + struct ds4424_data *data; + struct iio_dev *indio_dev; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "I2C is not supported\n"); + return -ENODEV; + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) { + pr_err("%s:%d\n", __func__, __LINE__); + return -ENOMEM; + } + + data = iio_priv(indio_dev); + memset(data, 0, sizeof(*data)); + i2c_set_clientdata(client, indio_dev); + data->client = client; + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + + ret = ds4424_verify_chip(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "%s failed. ret:%d\n", __func__, ret); + return -ENXIO; + } + + if (client->dev.of_node) { + ret = ds4424_parse_dt(indio_dev); + if (ret < 0) { + dev_err(&client->dev, + "%s - of_node error\n", __func__); + ret = -EINVAL; + } + } else { + pdata = client->dev.platform_data; + if (!pdata) { + dev_err(&client->dev, + "dts/platform data not found.\n"); + /* Use default driver settings */ + pdata = &ds4424_pdata_default; + } + + pdata = client->dev.platform_data; + data->min_rfs = pdata->min_rfs; + data->max_rfs = pdata->max_rfs; + data->ifs_scale = pdata->ifs_scale; + data->max_picoamp = pdata->max_picoamp; + data->vcc_reg_name = pdata->vcc_supply_name; + memcpy(data->rfs_res, pdata->rfs_res, + sizeof(uint32_t) * DS442X_MAX_DAC_CHANNELS); + memcpy(data->dac_iio_map, pdata->dac_iio_map, + sizeof(struct iio_map) * DS442X_MAX_DAC_CHANNELS); + } + + if (data->vcc_reg_name) { + data->vcc_reg = devm_regulator_get(&client->dev, + data->vcc_reg_name); + if (IS_ERR(data->vcc_reg)) { + ret = PTR_ERR(data->vcc_reg); + dev_err(&client->dev, + "Failed to get vcc_reg regulator: %d\n", ret); + return ret; + } + } + + mutex_init(&data->lock); + ret = ds4424_regulator_onoff(indio_dev, PWR_ON); + if (ret < 0) { + pr_err("Unable to turn on the regulator. %s:%d, ret: %d\n", + __func__, __LINE__, ret); + return ret; + } + + switch (id->driver_data) { + case ID_DS4422: + indio_dev->num_channels = DS4422_MAX_DAC_CHANNELS; + break; + case ID_DS4424: + indio_dev->num_channels = DS4424_MAX_DAC_CHANNELS; + break; + default: + indio_dev->num_channels = DS4424_MAX_DAC_CHANNELS; + break; + } + + indio_dev->channels = ds4424_channels; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &ds4424_info; + + ret = iio_map_array_register(indio_dev, data->dac_iio_map); + if (ret < 0) + goto err_iio_device_0; + + ret = iio_device_register(indio_dev); + if (ret < 0) { + pr_err("iio_device_register failed . %s:%d, ret: %d\n", + __func__, __LINE__, ret); + goto err_iio_device_1; + } + + return ret; + +err_iio_device_0: + ds4424_regulator_onoff(indio_dev, PWR_OFF); +err_iio_device_1: + iio_map_array_unregister(indio_dev); + return ret; +} + +static int ds4424_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_map_array_unregister(indio_dev); + ds4424_regulator_onoff(indio_dev, PWR_OFF); + return 0; +} + +static const struct i2c_device_id ds4424_id[] = { + { "ds4422", ID_DS4422 }, + { "ds4424", ID_DS4424 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ds4424_id); + +static const struct of_device_id ds4424_of_match[] = { + { .compatible = "maxim,ds4422" }, + { .compatible = "maxim,ds4424" }, + { } +}; + +MODULE_DEVICE_TABLE(of, ds4424_of_match); + +static struct i2c_driver ds4424_driver = { + .driver = { + .name = "ds4424", + .pm = DS4424_PM_OPS, + }, + .probe = ds4424_probe, + .remove = ds4424_remove, + .id_table = ds4424_id, +}; +module_i2c_driver(ds4424_driver); + +MODULE_DESCRIPTION("Maxim DS4424 DAC Driver"); +MODULE_AUTHOR("Ismail H. Kose <ismail.k...@maximintegrated.com>"); +MODULE_AUTHOR("Vishal Sood <vishal.s...@maximintegrated.com>"); +MODULE_AUTHOR("David Jung <david.j...@maximintegrated.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/iio/dac/ds4424.h b/include/linux/iio/dac/ds4424.h new file mode 100644 index 000000000000..09ff3d61797d --- /dev/null +++ b/include/linux/iio/dac/ds4424.h @@ -0,0 +1,29 @@ +/* + * Maxim Integrated + * 7-bit, Multi-Channel Sink/Source Current DAC Driver + * Copyright (C) 2017 Maxim Integrated + * + * 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. + */ + +#ifndef IIO_DAC_DS4424_H_ +#define IIO_DAC_DS4424_H_ +#include <linux/iio/iio.h> +#include <linux/iio/machine.h> + +#define DS4422_MAX_DAC_CHANNELS 2 +#define DS4424_MAX_DAC_CHANNELS 4 +#define DS442X_MAX_DAC_CHANNELS DS4424_MAX_DAC_CHANNELS + +struct ds4424_pdata { + const char *vcc_supply_name; + uint32_t max_rfs; + uint32_t min_rfs; + uint32_t ifs_scale; + uint32_t max_picoamp; + uint32_t rfs_res[DS442X_MAX_DAC_CHANNELS]; + struct iio_map dac_iio_map[DS442X_MAX_DAC_CHANNELS + 1]; +}; +#endif /* IIO_DAC_DS4424_H_ */ -- 2.11.0
