1 // SPDX-License-Identifier: GPL-2.0-only
3 * ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver
5 * Copyright (C) 2018 Prevas A/S
7 * https://www.ti.com/lit/ds/symlink/dac5571.pdf
8 * https://www.ti.com/lit/ds/symlink/dac6571.pdf
9 * https://www.ti.com/lit/ds/symlink/dac7571.pdf
10 * https://www.ti.com/lit/ds/symlink/dac5574.pdf
11 * https://www.ti.com/lit/ds/symlink/dac6574.pdf
12 * https://www.ti.com/lit/ds/symlink/dac7574.pdf
13 * https://www.ti.com/lit/ds/symlink/dac5573.pdf
14 * https://www.ti.com/lit/ds/symlink/dac6573.pdf
15 * https://www.ti.com/lit/ds/symlink/dac7573.pdf
18 #include <linux/iio/iio.h>
19 #include <linux/i2c.h>
20 #include <linux/module.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/property.h>
23 #include <linux/regulator/consumer.h>
26 single_8bit, single_10bit, single_12bit,
27 quad_8bit, quad_10bit, quad_12bit
35 static const struct dac5571_spec dac5571_spec[] = {
36 [single_8bit] = {.num_channels = 1, .resolution = 8},
37 [single_10bit] = {.num_channels = 1, .resolution = 10},
38 [single_12bit] = {.num_channels = 1, .resolution = 12},
39 [quad_8bit] = {.num_channels = 4, .resolution = 8},
40 [quad_10bit] = {.num_channels = 4, .resolution = 10},
41 [quad_12bit] = {.num_channels = 4, .resolution = 12},
45 struct i2c_client *client;
48 struct regulator *vref;
52 struct dac5571_spec const *spec;
53 int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
54 int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
55 u8 buf[3] ____cacheline_aligned;
58 #define DAC5571_POWERDOWN(mode) ((mode) + 1)
59 #define DAC5571_POWERDOWN_FLAG BIT(0)
60 #define DAC5571_CHANNEL_SELECT 1
61 #define DAC5571_LOADMODE_DIRECT BIT(4)
62 #define DAC5571_SINGLE_PWRDWN_BITS 4
63 #define DAC5571_QUAD_PWRDWN_BITS 6
65 static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
69 shift = 12 - data->spec->resolution;
70 data->buf[1] = val << shift;
71 data->buf[0] = val >> (8 - shift);
73 if (i2c_master_send(data->client, data->buf, 2) != 2)
79 static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
83 shift = 16 - data->spec->resolution;
84 data->buf[2] = val << shift;
85 data->buf[1] = (val >> (8 - shift));
86 data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
87 DAC5571_LOADMODE_DIRECT;
89 if (i2c_master_send(data->client, data->buf, 3) != 3)
95 static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
98 data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;
100 if (i2c_master_send(data->client, data->buf, 2) != 2)
106 static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
109 data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
110 data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
111 DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;
113 if (i2c_master_send(data->client, data->buf, 3) != 3)
119 static const char *const dac5571_powerdown_modes[] = {
120 "1kohm_to_gnd", "100kohm_to_gnd", "three_state",
123 static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
124 const struct iio_chan_spec *chan)
126 struct dac5571_data *data = iio_priv(indio_dev);
128 return data->powerdown_mode[chan->channel];
131 static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
132 const struct iio_chan_spec *chan,
135 struct dac5571_data *data = iio_priv(indio_dev);
138 if (data->powerdown_mode[chan->channel] == mode)
141 mutex_lock(&data->lock);
142 if (data->powerdown[chan->channel]) {
143 ret = data->dac5571_pwrdwn(data, chan->channel,
144 DAC5571_POWERDOWN(mode));
148 data->powerdown_mode[chan->channel] = mode;
151 mutex_unlock(&data->lock);
156 static const struct iio_enum dac5571_powerdown_mode = {
157 .items = dac5571_powerdown_modes,
158 .num_items = ARRAY_SIZE(dac5571_powerdown_modes),
159 .get = dac5571_get_powerdown_mode,
160 .set = dac5571_set_powerdown_mode,
163 static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
165 const struct iio_chan_spec *chan,
168 struct dac5571_data *data = iio_priv(indio_dev);
170 return sysfs_emit(buf, "%d\n", data->powerdown[chan->channel]);
173 static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
175 const struct iio_chan_spec *chan,
176 const char *buf, size_t len)
178 struct dac5571_data *data = iio_priv(indio_dev);
182 ret = kstrtobool(buf, &powerdown);
186 if (data->powerdown[chan->channel] == powerdown)
189 mutex_lock(&data->lock);
191 ret = data->dac5571_pwrdwn(data, chan->channel,
192 DAC5571_POWERDOWN(data->powerdown_mode[chan->channel]));
194 ret = data->dac5571_cmd(data, chan->channel,
195 data->val[chan->channel]);
199 data->powerdown[chan->channel] = powerdown;
202 mutex_unlock(&data->lock);
204 return ret ? ret : len;
208 static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
211 .read = dac5571_read_powerdown,
212 .write = dac5571_write_powerdown,
213 .shared = IIO_SEPARATE,
215 IIO_ENUM("powerdown_mode", IIO_SEPARATE, &dac5571_powerdown_mode),
216 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
220 #define dac5571_CHANNEL(chan, name) { \
221 .type = IIO_VOLTAGE, \
226 .datasheet_name = name, \
227 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
228 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
229 .ext_info = dac5571_ext_info, \
232 static const struct iio_chan_spec dac5571_channels[] = {
233 dac5571_CHANNEL(0, "A"),
234 dac5571_CHANNEL(1, "B"),
235 dac5571_CHANNEL(2, "C"),
236 dac5571_CHANNEL(3, "D"),
239 static int dac5571_read_raw(struct iio_dev *indio_dev,
240 struct iio_chan_spec const *chan,
241 int *val, int *val2, long mask)
243 struct dac5571_data *data = iio_priv(indio_dev);
247 case IIO_CHAN_INFO_RAW:
248 *val = data->val[chan->channel];
251 case IIO_CHAN_INFO_SCALE:
252 ret = regulator_get_voltage(data->vref);
257 *val2 = data->spec->resolution;
258 return IIO_VAL_FRACTIONAL_LOG2;
265 static int dac5571_write_raw(struct iio_dev *indio_dev,
266 struct iio_chan_spec const *chan,
267 int val, int val2, long mask)
269 struct dac5571_data *data = iio_priv(indio_dev);
273 case IIO_CHAN_INFO_RAW:
274 if (data->val[chan->channel] == val)
277 if (val >= (1 << data->spec->resolution) || val < 0)
280 if (data->powerdown[chan->channel])
283 mutex_lock(&data->lock);
284 ret = data->dac5571_cmd(data, chan->channel, val);
286 data->val[chan->channel] = val;
287 mutex_unlock(&data->lock);
295 static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
296 struct iio_chan_spec const *chan,
302 static const struct iio_info dac5571_info = {
303 .read_raw = dac5571_read_raw,
304 .write_raw = dac5571_write_raw,
305 .write_raw_get_fmt = dac5571_write_raw_get_fmt,
308 static int dac5571_probe(struct i2c_client *client,
309 const struct i2c_device_id *id)
311 struct device *dev = &client->dev;
312 const struct dac5571_spec *spec;
313 struct dac5571_data *data;
314 struct iio_dev *indio_dev;
315 enum chip_id chip_id;
318 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
322 data = iio_priv(indio_dev);
323 i2c_set_clientdata(client, indio_dev);
324 data->client = client;
326 indio_dev->info = &dac5571_info;
327 indio_dev->name = id->name;
328 indio_dev->modes = INDIO_DIRECT_MODE;
329 indio_dev->channels = dac5571_channels;
332 chip_id = (uintptr_t)device_get_match_data(dev);
334 chip_id = id->driver_data;
336 spec = &dac5571_spec[chip_id];
338 indio_dev->num_channels = spec->num_channels;
341 data->vref = devm_regulator_get(dev, "vref");
342 if (IS_ERR(data->vref))
343 return PTR_ERR(data->vref);
345 ret = regulator_enable(data->vref);
349 mutex_init(&data->lock);
351 switch (spec->num_channels) {
353 data->dac5571_cmd = dac5571_cmd_single;
354 data->dac5571_pwrdwn = dac5571_pwrdwn_single;
357 data->dac5571_cmd = dac5571_cmd_quad;
358 data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
365 for (i = 0; i < spec->num_channels; i++) {
366 ret = data->dac5571_cmd(data, i, 0);
368 dev_err(dev, "failed to initialize channel %d to 0\n", i);
373 ret = iio_device_register(indio_dev);
380 regulator_disable(data->vref);
384 static int dac5571_remove(struct i2c_client *i2c)
386 struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
387 struct dac5571_data *data = iio_priv(indio_dev);
389 iio_device_unregister(indio_dev);
390 regulator_disable(data->vref);
395 static const struct of_device_id dac5571_of_id[] = {
396 {.compatible = "ti,dac5571", .data = (void *)single_8bit},
397 {.compatible = "ti,dac6571", .data = (void *)single_10bit},
398 {.compatible = "ti,dac7571", .data = (void *)single_12bit},
399 {.compatible = "ti,dac5574", .data = (void *)quad_8bit},
400 {.compatible = "ti,dac6574", .data = (void *)quad_10bit},
401 {.compatible = "ti,dac7574", .data = (void *)quad_12bit},
402 {.compatible = "ti,dac5573", .data = (void *)quad_8bit},
403 {.compatible = "ti,dac6573", .data = (void *)quad_10bit},
404 {.compatible = "ti,dac7573", .data = (void *)quad_12bit},
407 MODULE_DEVICE_TABLE(of, dac5571_of_id);
409 static const struct i2c_device_id dac5571_id[] = {
410 {"dac5571", single_8bit},
411 {"dac6571", single_10bit},
412 {"dac7571", single_12bit},
413 {"dac5574", quad_8bit},
414 {"dac6574", quad_10bit},
415 {"dac7574", quad_12bit},
416 {"dac5573", quad_8bit},
417 {"dac6573", quad_10bit},
418 {"dac7573", quad_12bit},
421 MODULE_DEVICE_TABLE(i2c, dac5571_id);
423 static struct i2c_driver dac5571_driver = {
425 .name = "ti-dac5571",
426 .of_match_table = dac5571_of_id,
428 .probe = dac5571_probe,
429 .remove = dac5571_remove,
430 .id_table = dac5571_id,
432 module_i2c_driver(dac5571_driver);
434 MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>");
435 MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
436 MODULE_LICENSE("GPL v2");