2 * AD5504, AD5501 High Voltage Digital to Analog Converter
4 * Copyright 2011 Analog Devices Inc.
6 * Licensed under the GPL-2.
9 #include <linux/interrupt.h>
11 #include <linux/device.h>
12 #include <linux/kernel.h>
13 #include <linux/spi/spi.h>
14 #include <linux/slab.h>
15 #include <linux/sysfs.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/module.h>
18 #include <linux/bitops.h>
20 #include <linux/iio/iio.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/events.h>
23 #include <linux/iio/dac/ad5504.h>
25 #define AD5504_RES_MASK GENMASK(11, 0)
26 #define AD5504_CMD_READ BIT(15)
27 #define AD5504_CMD_WRITE 0
28 #define AD5504_ADDR(addr) ((addr) << 12)
31 #define AD5504_ADDR_NOOP 0
32 #define AD5504_ADDR_DAC(x) ((x) + 1)
33 #define AD5504_ADDR_ALL_DAC 5
34 #define AD5504_ADDR_CTRL 7
36 /* Control Register */
37 #define AD5504_DAC_PWR(ch) ((ch) << 2)
38 #define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
39 #define AD5504_DAC_PWRDN_20K 0
40 #define AD5504_DAC_PWRDN_3STATE 1
43 * struct ad5446_state - driver instance specific data
45 * @reg: supply regulator
46 * @vref_mv: actual reference voltage used
47 * @pwr_down_mask power down mask
48 * @pwr_down_mode current power down mode
49 * @data: transfer buffer
52 struct spi_device *spi;
53 struct regulator *reg;
54 unsigned short vref_mv;
55 unsigned pwr_down_mask;
56 unsigned pwr_down_mode;
58 __be16 data[2] ____cacheline_aligned;
62 * ad5504_supported_device_ids:
65 enum ad5504_supported_device_ids {
70 static int ad5504_spi_write(struct ad5504_state *st, u8 addr, u16 val)
72 st->data[0] = cpu_to_be16(AD5504_CMD_WRITE | AD5504_ADDR(addr) |
73 (val & AD5504_RES_MASK));
75 return spi_write(st->spi, &st->data[0], 2);
78 static int ad5504_spi_read(struct ad5504_state *st, u8 addr)
81 struct spi_transfer t = {
82 .tx_buf = &st->data[0],
83 .rx_buf = &st->data[1],
87 st->data[0] = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
88 ret = spi_sync_transfer(st->spi, &t, 1);
92 return be16_to_cpu(st->data[1]) & AD5504_RES_MASK;
95 static int ad5504_read_raw(struct iio_dev *indio_dev,
96 struct iio_chan_spec const *chan,
101 struct ad5504_state *st = iio_priv(indio_dev);
105 case IIO_CHAN_INFO_RAW:
106 ret = ad5504_spi_read(st, chan->address);
113 case IIO_CHAN_INFO_SCALE:
115 *val2 = chan->scan_type.realbits;
116 return IIO_VAL_FRACTIONAL_LOG2;
121 static int ad5504_write_raw(struct iio_dev *indio_dev,
122 struct iio_chan_spec const *chan,
127 struct ad5504_state *st = iio_priv(indio_dev);
130 case IIO_CHAN_INFO_RAW:
131 if (val >= (1 << chan->scan_type.realbits) || val < 0)
134 return ad5504_spi_write(st, chan->address, val);
140 static const char * const ad5504_powerdown_modes[] = {
145 static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
146 const struct iio_chan_spec *chan)
148 struct ad5504_state *st = iio_priv(indio_dev);
150 return st->pwr_down_mode;
153 static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
154 const struct iio_chan_spec *chan, unsigned int mode)
156 struct ad5504_state *st = iio_priv(indio_dev);
158 st->pwr_down_mode = mode;
163 static const struct iio_enum ad5504_powerdown_mode_enum = {
164 .items = ad5504_powerdown_modes,
165 .num_items = ARRAY_SIZE(ad5504_powerdown_modes),
166 .get = ad5504_get_powerdown_mode,
167 .set = ad5504_set_powerdown_mode,
170 static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
171 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
173 struct ad5504_state *st = iio_priv(indio_dev);
175 return sprintf(buf, "%d\n",
176 !(st->pwr_down_mask & (1 << chan->channel)));
179 static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
180 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
185 struct ad5504_state *st = iio_priv(indio_dev);
187 ret = strtobool(buf, &pwr_down);
192 st->pwr_down_mask &= ~(1 << chan->channel);
194 st->pwr_down_mask |= (1 << chan->channel);
196 ret = ad5504_spi_write(st, AD5504_ADDR_CTRL,
197 AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
198 AD5504_DAC_PWR(st->pwr_down_mask));
200 /* writes to the CTRL register must be followed by a NOOP */
201 ad5504_spi_write(st, AD5504_ADDR_NOOP, 0);
203 return ret ? ret : len;
206 static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
207 static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
209 static struct attribute *ad5504_ev_attributes[] = {
210 &iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
211 &iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
215 static struct attribute_group ad5504_ev_attribute_group = {
216 .attrs = ad5504_ev_attributes,
219 static irqreturn_t ad5504_event_handler(int irq, void *private)
221 iio_push_event(private,
222 IIO_UNMOD_EVENT_CODE(IIO_TEMP,
226 iio_get_time_ns((struct iio_dev *)private));
231 static const struct iio_info ad5504_info = {
232 .write_raw = ad5504_write_raw,
233 .read_raw = ad5504_read_raw,
234 .event_attrs = &ad5504_ev_attribute_group,
235 .driver_module = THIS_MODULE,
238 static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
241 .read = ad5504_read_dac_powerdown,
242 .write = ad5504_write_dac_powerdown,
243 .shared = IIO_SEPARATE,
245 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
246 &ad5504_powerdown_mode_enum),
247 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
251 #define AD5504_CHANNEL(_chan) { \
252 .type = IIO_VOLTAGE, \
255 .channel = (_chan), \
256 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
257 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
258 .address = AD5504_ADDR_DAC(_chan), \
264 .ext_info = ad5504_ext_info, \
267 static const struct iio_chan_spec ad5504_channels[] = {
274 static int ad5504_probe(struct spi_device *spi)
276 struct ad5504_platform_data *pdata = spi->dev.platform_data;
277 struct iio_dev *indio_dev;
278 struct ad5504_state *st;
279 struct regulator *reg;
280 int ret, voltage_uv = 0;
282 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
285 reg = devm_regulator_get(&spi->dev, "vcc");
287 ret = regulator_enable(reg);
291 ret = regulator_get_voltage(reg);
293 goto error_disable_reg;
298 spi_set_drvdata(spi, indio_dev);
299 st = iio_priv(indio_dev);
301 st->vref_mv = voltage_uv / 1000;
303 st->vref_mv = pdata->vref_mv;
305 dev_warn(&spi->dev, "reference voltage unspecified\n");
309 indio_dev->dev.parent = &spi->dev;
310 indio_dev->name = spi_get_device_id(st->spi)->name;
311 indio_dev->info = &ad5504_info;
312 if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
313 indio_dev->num_channels = 1;
315 indio_dev->num_channels = 4;
316 indio_dev->channels = ad5504_channels;
317 indio_dev->modes = INDIO_DIRECT_MODE;
320 ret = devm_request_threaded_irq(&spi->dev, spi->irq,
322 &ad5504_event_handler,
323 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
324 spi_get_device_id(st->spi)->name,
327 goto error_disable_reg;
330 ret = iio_device_register(indio_dev);
332 goto error_disable_reg;
338 regulator_disable(reg);
343 static int ad5504_remove(struct spi_device *spi)
345 struct iio_dev *indio_dev = spi_get_drvdata(spi);
346 struct ad5504_state *st = iio_priv(indio_dev);
348 iio_device_unregister(indio_dev);
350 if (!IS_ERR(st->reg))
351 regulator_disable(st->reg);
356 static const struct spi_device_id ad5504_id[] = {
357 {"ad5504", ID_AD5504},
358 {"ad5501", ID_AD5501},
361 MODULE_DEVICE_TABLE(spi, ad5504_id);
363 static struct spi_driver ad5504_driver = {
367 .probe = ad5504_probe,
368 .remove = ad5504_remove,
369 .id_table = ad5504_id,
371 module_spi_driver(ad5504_driver);
373 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
374 MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
375 MODULE_LICENSE("GPL v2");