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>
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 AD5505_BITS 12
25 #define AD5504_RES_MASK ((1 << (AD5505_BITS)) - 1)
27 #define AD5504_CMD_READ (1 << 15)
28 #define AD5504_CMD_WRITE (0 << 15)
29 #define AD5504_ADDR(addr) ((addr) << 12)
32 #define AD5504_ADDR_NOOP 0
33 #define AD5504_ADDR_DAC(x) ((x) + 1)
34 #define AD5504_ADDR_ALL_DAC 5
35 #define AD5504_ADDR_CTRL 7
37 /* Control Register */
38 #define AD5504_DAC_PWR(ch) ((ch) << 2)
39 #define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
40 #define AD5504_DAC_PWRDN_20K 0
41 #define AD5504_DAC_PWRDN_3STATE 1
44 * struct ad5446_state - driver instance specific data
46 * @reg: supply regulator
47 * @vref_mv: actual reference voltage used
48 * @pwr_down_mask power down mask
49 * @pwr_down_mode current power down mode
53 struct spi_device *spi;
54 struct regulator *reg;
55 unsigned short vref_mv;
56 unsigned pwr_down_mask;
57 unsigned pwr_down_mode;
61 * ad5504_supported_device_ids:
64 enum ad5504_supported_device_ids {
69 static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
71 u16 tmp = cpu_to_be16(AD5504_CMD_WRITE |
73 (val & AD5504_RES_MASK));
75 return spi_write(spi, (u8 *)&tmp, 2);
78 static int ad5504_spi_read(struct spi_device *spi, u8 addr)
80 u16 tmp = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
83 struct spi_transfer t = {
91 spi_message_add_tail(&t, &m);
92 ret = spi_sync(spi, &m);
97 return be16_to_cpu(val) & AD5504_RES_MASK;
100 static int ad5504_read_raw(struct iio_dev *indio_dev,
101 struct iio_chan_spec const *chan,
106 struct ad5504_state *st = iio_priv(indio_dev);
107 unsigned long scale_uv;
111 case IIO_CHAN_INFO_RAW:
112 ret = ad5504_spi_read(st->spi, chan->address);
119 case IIO_CHAN_INFO_SCALE:
120 scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
121 *val = scale_uv / 1000;
122 *val2 = (scale_uv % 1000) * 1000;
123 return IIO_VAL_INT_PLUS_MICRO;
129 static int ad5504_write_raw(struct iio_dev *indio_dev,
130 struct iio_chan_spec const *chan,
135 struct ad5504_state *st = iio_priv(indio_dev);
139 case IIO_CHAN_INFO_RAW:
140 if (val >= (1 << chan->scan_type.realbits) || val < 0)
143 return ad5504_spi_write(st->spi, chan->address, val);
151 static const char * const ad5504_powerdown_modes[] = {
156 static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
157 const struct iio_chan_spec *chan)
159 struct ad5504_state *st = iio_priv(indio_dev);
161 return st->pwr_down_mode;
164 static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
165 const struct iio_chan_spec *chan, unsigned int mode)
167 struct ad5504_state *st = iio_priv(indio_dev);
169 st->pwr_down_mode = mode;
174 static const struct iio_enum ad5504_powerdown_mode_enum = {
175 .items = ad5504_powerdown_modes,
176 .num_items = ARRAY_SIZE(ad5504_powerdown_modes),
177 .get = ad5504_get_powerdown_mode,
178 .set = ad5504_set_powerdown_mode,
181 static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
182 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
184 struct ad5504_state *st = iio_priv(indio_dev);
186 return sprintf(buf, "%d\n",
187 !(st->pwr_down_mask & (1 << chan->channel)));
190 static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
191 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
196 struct ad5504_state *st = iio_priv(indio_dev);
198 ret = strtobool(buf, &pwr_down);
203 st->pwr_down_mask |= (1 << chan->channel);
205 st->pwr_down_mask &= ~(1 << chan->channel);
207 ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL,
208 AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
209 AD5504_DAC_PWR(st->pwr_down_mask));
211 /* writes to the CTRL register must be followed by a NOOP */
212 ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0);
214 return ret ? ret : len;
217 static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
218 static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
220 static struct attribute *ad5504_ev_attributes[] = {
221 &iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
222 &iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
226 static struct attribute_group ad5504_ev_attribute_group = {
227 .attrs = ad5504_ev_attributes,
231 static irqreturn_t ad5504_event_handler(int irq, void *private)
233 iio_push_event(private,
234 IIO_UNMOD_EVENT_CODE(IIO_TEMP,
243 static const struct iio_info ad5504_info = {
244 .write_raw = ad5504_write_raw,
245 .read_raw = ad5504_read_raw,
246 .event_attrs = &ad5504_ev_attribute_group,
247 .driver_module = THIS_MODULE,
250 static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
253 .read = ad5504_read_dac_powerdown,
254 .write = ad5504_write_dac_powerdown,
256 IIO_ENUM("powerdown_mode", true, &ad5504_powerdown_mode_enum),
257 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
261 #define AD5504_CHANNEL(_chan) { \
262 .type = IIO_VOLTAGE, \
265 .channel = (_chan), \
266 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
267 IIO_CHAN_INFO_SCALE_SHARED_BIT, \
268 .address = AD5504_ADDR_DAC(_chan), \
269 .scan_type = IIO_ST('u', 12, 16, 0), \
270 .ext_info = ad5504_ext_info, \
273 static const struct iio_chan_spec ad5504_channels[] = {
280 static int __devinit ad5504_probe(struct spi_device *spi)
282 struct ad5504_platform_data *pdata = spi->dev.platform_data;
283 struct iio_dev *indio_dev;
284 struct ad5504_state *st;
285 struct regulator *reg;
286 int ret, voltage_uv = 0;
288 indio_dev = iio_device_alloc(sizeof(*st));
289 if (indio_dev == NULL) {
293 reg = regulator_get(&spi->dev, "vcc");
295 ret = regulator_enable(reg);
299 voltage_uv = regulator_get_voltage(reg);
302 spi_set_drvdata(spi, indio_dev);
303 st = iio_priv(indio_dev);
305 st->vref_mv = voltage_uv / 1000;
307 st->vref_mv = pdata->vref_mv;
309 dev_warn(&spi->dev, "reference voltage unspecified\n");
313 indio_dev->dev.parent = &spi->dev;
314 indio_dev->name = spi_get_device_id(st->spi)->name;
315 indio_dev->info = &ad5504_info;
316 if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
317 indio_dev->num_channels = 1;
319 indio_dev->num_channels = 4;
320 indio_dev->channels = ad5504_channels;
321 indio_dev->modes = INDIO_DIRECT_MODE;
324 ret = request_threaded_irq(spi->irq,
326 &ad5504_event_handler,
327 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
328 spi_get_device_id(st->spi)->name,
331 goto error_disable_reg;
334 ret = iio_device_register(indio_dev);
342 free_irq(spi->irq, indio_dev);
345 regulator_disable(reg);
350 iio_device_free(indio_dev);
355 static int __devexit ad5504_remove(struct spi_device *spi)
357 struct iio_dev *indio_dev = spi_get_drvdata(spi);
358 struct ad5504_state *st = iio_priv(indio_dev);
360 iio_device_unregister(indio_dev);
362 free_irq(spi->irq, indio_dev);
364 if (!IS_ERR(st->reg)) {
365 regulator_disable(st->reg);
366 regulator_put(st->reg);
368 iio_device_free(indio_dev);
373 static const struct spi_device_id ad5504_id[] = {
374 {"ad5504", ID_AD5504},
375 {"ad5501", ID_AD5501},
378 MODULE_DEVICE_TABLE(spi, ad5504_id);
380 static struct spi_driver ad5504_driver = {
383 .owner = THIS_MODULE,
385 .probe = ad5504_probe,
386 .remove = __devexit_p(ad5504_remove),
387 .id_table = ad5504_id,
389 module_spi_driver(ad5504_driver);
391 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
392 MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
393 MODULE_LICENSE("GPL v2");