> Add iio driver for DS4422/DS4424 chips that support two/four channel 7-bit > Sink/Source Current DAC.
minor comments below, on top of Jonathan's > The driver supports device tree and platfrom files for the configurations. platform > 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. ampere > + - 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. _is_ optional > + > +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, this duplicates the text above, maybe drop it here? > + 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 maybe simply 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. chips > + > + This driver can also be built as a module. If so, the module > + will be called DAC_DS4424. module name will be lowercase, 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 alphabetic order please, maybe change to CONFIG_DS4424_DAC > 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 prefix with DS4424_ or ds4424_ > +#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, \ .shift not strictly needed > + }, \ > +} > + > +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]; avoid wildcards such as X if possible > +#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]; maybe a comment why you have + 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", */ drop comment > + .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 DS4422? > + * [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) parenthesis not strictly necessary > + && (chan->channel >= indio_dev->num_channels)) > + return -EINVAL; > + > + outbuf[0] = DS4424_DAC_ADDR(chan->channel); > + outbuf[1] = (val & 0xff); parenthesis not needed > + > + mutex_lock(&data->lock); > + ret = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf)); sizeof(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; spaces before and after / > + min_val = -max_val; > + if ((val > max_val) || (val < min_val)) parenthesis not needed > + 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])); &() parenthesis not needed, here and below > + 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"); dt vs dts, here and below; maybe DT? > + 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; extra spaces after = > + 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", delete space after 'failed' > + __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_ */ > -- Peter Meerwald-Stadler Mobile: +43 664 24 44 418
