| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver |
| * |
| * Copyright (C) 2018 Prevas A/S |
| * |
| * https://www.ti.com/lit/ds/symlink/dac5571.pdf |
| * https://www.ti.com/lit/ds/symlink/dac6571.pdf |
| * https://www.ti.com/lit/ds/symlink/dac7571.pdf |
| * https://www.ti.com/lit/ds/symlink/dac5574.pdf |
| * https://www.ti.com/lit/ds/symlink/dac6574.pdf |
| * https://www.ti.com/lit/ds/symlink/dac7574.pdf |
| * https://www.ti.com/lit/ds/symlink/dac5573.pdf |
| * https://www.ti.com/lit/ds/symlink/dac6573.pdf |
| * https://www.ti.com/lit/ds/symlink/dac7573.pdf |
| */ |
| |
| #include <linux/iio/iio.h> |
| #include <linux/i2c.h> |
| #include <linux/module.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/property.h> |
| #include <linux/regulator/consumer.h> |
| |
| enum chip_id { |
| single_8bit, single_10bit, single_12bit, |
| quad_8bit, quad_10bit, quad_12bit |
| }; |
| |
| struct dac5571_spec { |
| u8 num_channels; |
| u8 resolution; |
| }; |
| |
| static const struct dac5571_spec dac5571_spec[] = { |
| [single_8bit] = {.num_channels = 1, .resolution = 8}, |
| [single_10bit] = {.num_channels = 1, .resolution = 10}, |
| [single_12bit] = {.num_channels = 1, .resolution = 12}, |
| [quad_8bit] = {.num_channels = 4, .resolution = 8}, |
| [quad_10bit] = {.num_channels = 4, .resolution = 10}, |
| [quad_12bit] = {.num_channels = 4, .resolution = 12}, |
| }; |
| |
| struct dac5571_data { |
| struct i2c_client *client; |
| int id; |
| struct mutex lock; |
| struct regulator *vref; |
| u16 val[4]; |
| bool powerdown[4]; |
| u8 powerdown_mode[4]; |
| struct dac5571_spec const *spec; |
| int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val); |
| int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn); |
| u8 buf[3] ____cacheline_aligned; |
| }; |
| |
| #define DAC5571_POWERDOWN(mode) ((mode) + 1) |
| #define DAC5571_POWERDOWN_FLAG BIT(0) |
| #define DAC5571_CHANNEL_SELECT 1 |
| #define DAC5571_LOADMODE_DIRECT BIT(4) |
| #define DAC5571_SINGLE_PWRDWN_BITS 4 |
| #define DAC5571_QUAD_PWRDWN_BITS 6 |
| |
| static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val) |
| { |
| unsigned int shift; |
| |
| shift = 12 - data->spec->resolution; |
| data->buf[1] = val << shift; |
| data->buf[0] = val >> (8 - shift); |
| |
| if (i2c_master_send(data->client, data->buf, 2) != 2) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val) |
| { |
| unsigned int shift; |
| |
| shift = 16 - data->spec->resolution; |
| data->buf[2] = val << shift; |
| data->buf[1] = (val >> (8 - shift)); |
| data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) | |
| DAC5571_LOADMODE_DIRECT; |
| |
| if (i2c_master_send(data->client, data->buf, 3) != 3) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn) |
| { |
| data->buf[1] = 0; |
| data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS; |
| |
| if (i2c_master_send(data->client, data->buf, 2) != 2) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn) |
| { |
| data->buf[2] = 0; |
| data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS; |
| data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) | |
| DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG; |
| |
| if (i2c_master_send(data->client, data->buf, 3) != 3) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static const char *const dac5571_powerdown_modes[] = { |
| "1kohm_to_gnd", "100kohm_to_gnd", "three_state", |
| }; |
| |
| static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| |
| return data->powerdown_mode[chan->channel]; |
| } |
| |
| static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| unsigned int mode) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| int ret = 0; |
| |
| if (data->powerdown_mode[chan->channel] == mode) |
| return 0; |
| |
| mutex_lock(&data->lock); |
| if (data->powerdown[chan->channel]) { |
| ret = data->dac5571_pwrdwn(data, chan->channel, |
| DAC5571_POWERDOWN(mode)); |
| if (ret) |
| goto out; |
| } |
| data->powerdown_mode[chan->channel] = mode; |
| |
| out: |
| mutex_unlock(&data->lock); |
| |
| return ret; |
| } |
| |
| static const struct iio_enum dac5571_powerdown_mode = { |
| .items = dac5571_powerdown_modes, |
| .num_items = ARRAY_SIZE(dac5571_powerdown_modes), |
| .get = dac5571_get_powerdown_mode, |
| .set = dac5571_set_powerdown_mode, |
| }; |
| |
| static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev, |
| uintptr_t private, |
| const struct iio_chan_spec *chan, |
| char *buf) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| |
| return sysfs_emit(buf, "%d\n", data->powerdown[chan->channel]); |
| } |
| |
| static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev, |
| uintptr_t private, |
| const struct iio_chan_spec *chan, |
| const char *buf, size_t len) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| bool powerdown; |
| int ret; |
| |
| ret = strtobool(buf, &powerdown); |
| if (ret) |
| return ret; |
| |
| if (data->powerdown[chan->channel] == powerdown) |
| return len; |
| |
| mutex_lock(&data->lock); |
| if (powerdown) |
| ret = data->dac5571_pwrdwn(data, chan->channel, |
| DAC5571_POWERDOWN(data->powerdown_mode[chan->channel])); |
| else |
| ret = data->dac5571_cmd(data, chan->channel, |
| data->val[chan->channel]); |
| if (ret) |
| goto out; |
| |
| data->powerdown[chan->channel] = powerdown; |
| |
| out: |
| mutex_unlock(&data->lock); |
| |
| return ret ? ret : len; |
| } |
| |
| |
| static const struct iio_chan_spec_ext_info dac5571_ext_info[] = { |
| { |
| .name = "powerdown", |
| .read = dac5571_read_powerdown, |
| .write = dac5571_write_powerdown, |
| .shared = IIO_SEPARATE, |
| }, |
| IIO_ENUM("powerdown_mode", IIO_SEPARATE, &dac5571_powerdown_mode), |
| IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode), |
| {}, |
| }; |
| |
| #define dac5571_CHANNEL(chan, name) { \ |
| .type = IIO_VOLTAGE, \ |
| .channel = (chan), \ |
| .address = (chan), \ |
| .indexed = true, \ |
| .output = true, \ |
| .datasheet_name = name, \ |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| .ext_info = dac5571_ext_info, \ |
| } |
| |
| static const struct iio_chan_spec dac5571_channels[] = { |
| dac5571_CHANNEL(0, "A"), |
| dac5571_CHANNEL(1, "B"), |
| dac5571_CHANNEL(2, "C"), |
| dac5571_CHANNEL(3, "D"), |
| }; |
| |
| static int dac5571_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| *val = data->val[chan->channel]; |
| return IIO_VAL_INT; |
| |
| case IIO_CHAN_INFO_SCALE: |
| ret = regulator_get_voltage(data->vref); |
| if (ret < 0) |
| return ret; |
| |
| *val = ret / 1000; |
| *val2 = data->spec->resolution; |
| return IIO_VAL_FRACTIONAL_LOG2; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int dac5571_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| struct dac5571_data *data = iio_priv(indio_dev); |
| int ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| if (data->val[chan->channel] == val) |
| return 0; |
| |
| if (val >= (1 << data->spec->resolution) || val < 0) |
| return -EINVAL; |
| |
| if (data->powerdown[chan->channel]) |
| return -EBUSY; |
| |
| mutex_lock(&data->lock); |
| ret = data->dac5571_cmd(data, chan->channel, val); |
| if (ret == 0) |
| data->val[chan->channel] = val; |
| mutex_unlock(&data->lock); |
| return ret; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| long mask) |
| { |
| return IIO_VAL_INT; |
| } |
| |
| static const struct iio_info dac5571_info = { |
| .read_raw = dac5571_read_raw, |
| .write_raw = dac5571_write_raw, |
| .write_raw_get_fmt = dac5571_write_raw_get_fmt, |
| }; |
| |
| static int dac5571_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct device *dev = &client->dev; |
| const struct dac5571_spec *spec; |
| struct dac5571_data *data; |
| struct iio_dev *indio_dev; |
| enum chip_id chip_id; |
| int ret, i; |
| |
| indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| data = iio_priv(indio_dev); |
| i2c_set_clientdata(client, indio_dev); |
| data->client = client; |
| |
| indio_dev->info = &dac5571_info; |
| indio_dev->name = id->name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = dac5571_channels; |
| |
| if (dev_fwnode(dev)) |
| chip_id = (uintptr_t)device_get_match_data(dev); |
| else |
| chip_id = id->driver_data; |
| |
| spec = &dac5571_spec[chip_id]; |
| |
| indio_dev->num_channels = spec->num_channels; |
| data->spec = spec; |
| |
| data->vref = devm_regulator_get(dev, "vref"); |
| if (IS_ERR(data->vref)) |
| return PTR_ERR(data->vref); |
| |
| ret = regulator_enable(data->vref); |
| if (ret < 0) |
| return ret; |
| |
| mutex_init(&data->lock); |
| |
| switch (spec->num_channels) { |
| case 1: |
| data->dac5571_cmd = dac5571_cmd_single; |
| data->dac5571_pwrdwn = dac5571_pwrdwn_single; |
| break; |
| case 4: |
| data->dac5571_cmd = dac5571_cmd_quad; |
| data->dac5571_pwrdwn = dac5571_pwrdwn_quad; |
| break; |
| default: |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| for (i = 0; i < spec->num_channels; i++) { |
| ret = data->dac5571_cmd(data, i, 0); |
| if (ret) { |
| dev_err(dev, "failed to initialize channel %d to 0\n", i); |
| goto err; |
| } |
| } |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto err; |
| |
| return 0; |
| |
| err: |
| regulator_disable(data->vref); |
| return ret; |
| } |
| |
| static int dac5571_remove(struct i2c_client *i2c) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(i2c); |
| struct dac5571_data *data = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| regulator_disable(data->vref); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id dac5571_of_id[] = { |
| {.compatible = "ti,dac5571", .data = (void *)single_8bit}, |
| {.compatible = "ti,dac6571", .data = (void *)single_10bit}, |
| {.compatible = "ti,dac7571", .data = (void *)single_12bit}, |
| {.compatible = "ti,dac5574", .data = (void *)quad_8bit}, |
| {.compatible = "ti,dac6574", .data = (void *)quad_10bit}, |
| {.compatible = "ti,dac7574", .data = (void *)quad_12bit}, |
| {.compatible = "ti,dac5573", .data = (void *)quad_8bit}, |
| {.compatible = "ti,dac6573", .data = (void *)quad_10bit}, |
| {.compatible = "ti,dac7573", .data = (void *)quad_12bit}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, dac5571_of_id); |
| |
| static const struct i2c_device_id dac5571_id[] = { |
| {"dac5571", single_8bit}, |
| {"dac6571", single_10bit}, |
| {"dac7571", single_12bit}, |
| {"dac5574", quad_8bit}, |
| {"dac6574", quad_10bit}, |
| {"dac7574", quad_12bit}, |
| {"dac5573", quad_8bit}, |
| {"dac6573", quad_10bit}, |
| {"dac7573", quad_12bit}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, dac5571_id); |
| |
| static struct i2c_driver dac5571_driver = { |
| .driver = { |
| .name = "ti-dac5571", |
| .of_match_table = dac5571_of_id, |
| }, |
| .probe = dac5571_probe, |
| .remove = dac5571_remove, |
| .id_table = dac5571_id, |
| }; |
| module_i2c_driver(dac5571_driver); |
| |
| MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>"); |
| MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver"); |
| MODULE_LICENSE("GPL v2"); |