1 // SPDX-License-Identifier: GPL-2.0-only
3 * AD5504, AD5501 High Voltage Digital to Analog Converter
5 * Copyright 2011 Analog Devices Inc.
8 #include <linux/interrupt.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/spi/spi.h>
13 #include <linux/slab.h>
14 #include <linux/sysfs.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/module.h>
17 #include <linux/bitops.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
21 #include <linux/iio/events.h>
22 #include <linux/iio/dac/ad5504.h>
24 #define AD5504_RES_MASK GENMASK(11, 0)
25 #define AD5504_CMD_READ BIT(15)
26 #define AD5504_CMD_WRITE 0
27 #define AD5504_ADDR(addr) ((addr) << 12)
30 #define AD5504_ADDR_NOOP 0
31 #define AD5504_ADDR_DAC(x) ((x) + 1)
32 #define AD5504_ADDR_ALL_DAC 5
33 #define AD5504_ADDR_CTRL 7
35 /* Control Register */
36 #define AD5504_DAC_PWR(ch) ((ch) << 2)
37 #define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
38 #define AD5504_DAC_PWRDN_20K 0
39 #define AD5504_DAC_PWRDN_3STATE 1
42 * struct ad5446_state - driver instance specific data
44 * @reg: supply regulator
45 * @vref_mv: actual reference voltage used
46 * @pwr_down_mask power down mask
47 * @pwr_down_mode current power down mode
48 * @data: transfer buffer
51 struct spi_device *spi;
52 struct regulator *reg;
53 unsigned short vref_mv;
54 unsigned pwr_down_mask;
55 unsigned pwr_down_mode;
57 __be16 data[2] ____cacheline_aligned;
61 * ad5504_supported_device_ids:
64 enum ad5504_supported_device_ids {
69 static int ad5504_spi_write(struct ad5504_state *st, u8 addr, u16 val)
71 st->data[0] = cpu_to_be16(AD5504_CMD_WRITE | AD5504_ADDR(addr) |
72 (val & AD5504_RES_MASK));
74 return spi_write(st->spi, &st->data[0], 2);
77 static int ad5504_spi_read(struct ad5504_state *st, u8 addr)
80 struct spi_transfer t = {
81 .tx_buf = &st->data[0],
82 .rx_buf = &st->data[1],
86 st->data[0] = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
87 ret = spi_sync_transfer(st->spi, &t, 1);
91 return be16_to_cpu(st->data[1]) & AD5504_RES_MASK;
94 static int ad5504_read_raw(struct iio_dev *indio_dev,
95 struct iio_chan_spec const *chan,
100 struct ad5504_state *st = iio_priv(indio_dev);
104 case IIO_CHAN_INFO_RAW:
105 ret = ad5504_spi_read(st, chan->address);
112 case IIO_CHAN_INFO_SCALE:
114 *val2 = chan->scan_type.realbits;
115 return IIO_VAL_FRACTIONAL_LOG2;
120 static int ad5504_write_raw(struct iio_dev *indio_dev,
121 struct iio_chan_spec const *chan,
126 struct ad5504_state *st = iio_priv(indio_dev);
129 case IIO_CHAN_INFO_RAW:
130 if (val >= (1 << chan->scan_type.realbits) || val < 0)
133 return ad5504_spi_write(st, chan->address, val);
139 static const char * const ad5504_powerdown_modes[] = {
144 static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
145 const struct iio_chan_spec *chan)
147 struct ad5504_state *st = iio_priv(indio_dev);
149 return st->pwr_down_mode;
152 static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
153 const struct iio_chan_spec *chan, unsigned int mode)
155 struct ad5504_state *st = iio_priv(indio_dev);
157 st->pwr_down_mode = mode;
162 static const struct iio_enum ad5504_powerdown_mode_enum = {
163 .items = ad5504_powerdown_modes,
164 .num_items = ARRAY_SIZE(ad5504_powerdown_modes),
165 .get = ad5504_get_powerdown_mode,
166 .set = ad5504_set_powerdown_mode,
169 static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
170 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
172 struct ad5504_state *st = iio_priv(indio_dev);
174 return sprintf(buf, "%d\n",
175 !(st->pwr_down_mask & (1 << chan->channel)));
178 static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
179 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
184 struct ad5504_state *st = iio_priv(indio_dev);
186 ret = strtobool(buf, &pwr_down);
191 st->pwr_down_mask |= (1 << chan->channel);
193 st->pwr_down_mask &= ~(1 << chan->channel);
195 ret = ad5504_spi_write(st, AD5504_ADDR_CTRL,
196 AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
197 AD5504_DAC_PWR(st->pwr_down_mask));
199 /* writes to the CTRL register must be followed by a NOOP */
200 ad5504_spi_write(st, AD5504_ADDR_NOOP, 0);
202 return ret ? ret : len;
205 static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
206 static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
208 static struct attribute *ad5504_ev_attributes[] = {
209 &iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
210 &iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
214 static const struct attribute_group ad5504_ev_attribute_group = {
215 .attrs = ad5504_ev_attributes,
218 static irqreturn_t ad5504_event_handler(int irq, void *private)
220 iio_push_event(private,
221 IIO_UNMOD_EVENT_CODE(IIO_TEMP,
225 iio_get_time_ns(private));
230 static const struct iio_info ad5504_info = {
231 .write_raw = ad5504_write_raw,
232 .read_raw = ad5504_read_raw,
233 .event_attrs = &ad5504_ev_attribute_group,
236 static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
239 .read = ad5504_read_dac_powerdown,
240 .write = ad5504_write_dac_powerdown,
241 .shared = IIO_SEPARATE,
243 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
244 &ad5504_powerdown_mode_enum),
245 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
249 #define AD5504_CHANNEL(_chan) { \
250 .type = IIO_VOLTAGE, \
253 .channel = (_chan), \
254 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
255 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
256 .address = AD5504_ADDR_DAC(_chan), \
262 .ext_info = ad5504_ext_info, \
265 static const struct iio_chan_spec ad5504_channels[] = {
272 static int ad5504_probe(struct spi_device *spi)
274 struct ad5504_platform_data *pdata = spi->dev.platform_data;
275 struct iio_dev *indio_dev;
276 struct ad5504_state *st;
277 struct regulator *reg;
278 int ret, voltage_uv = 0;
280 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
283 reg = devm_regulator_get(&spi->dev, "vcc");
285 ret = regulator_enable(reg);
289 ret = regulator_get_voltage(reg);
291 goto error_disable_reg;
296 spi_set_drvdata(spi, indio_dev);
297 st = iio_priv(indio_dev);
299 st->vref_mv = voltage_uv / 1000;
301 st->vref_mv = pdata->vref_mv;
303 dev_warn(&spi->dev, "reference voltage unspecified\n");
307 indio_dev->dev.parent = &spi->dev;
308 indio_dev->name = spi_get_device_id(st->spi)->name;
309 indio_dev->info = &ad5504_info;
310 if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
311 indio_dev->num_channels = 1;
313 indio_dev->num_channels = 4;
314 indio_dev->channels = ad5504_channels;
315 indio_dev->modes = INDIO_DIRECT_MODE;
318 ret = devm_request_threaded_irq(&spi->dev, spi->irq,
320 &ad5504_event_handler,
321 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
322 spi_get_device_id(st->spi)->name,
325 goto error_disable_reg;
328 ret = iio_device_register(indio_dev);
330 goto error_disable_reg;
336 regulator_disable(reg);
341 static int ad5504_remove(struct spi_device *spi)
343 struct iio_dev *indio_dev = spi_get_drvdata(spi);
344 struct ad5504_state *st = iio_priv(indio_dev);
346 iio_device_unregister(indio_dev);
348 if (!IS_ERR(st->reg))
349 regulator_disable(st->reg);
354 static const struct spi_device_id ad5504_id[] = {
355 {"ad5504", ID_AD5504},
356 {"ad5501", ID_AD5501},
359 MODULE_DEVICE_TABLE(spi, ad5504_id);
361 static struct spi_driver ad5504_driver = {
365 .probe = ad5504_probe,
366 .remove = ad5504_remove,
367 .id_table = ad5504_id,
369 module_spi_driver(ad5504_driver);
371 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
372 MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
373 MODULE_LICENSE("GPL v2");