2 * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
4 * Copyright 2010-2011 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>
24 #define AD5624R_CHANNEL(_chan, _bits) { \
25 .type = IIO_VOLTAGE, \
29 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
30 IIO_CHAN_INFO_SCALE_SHARED_BIT, \
32 .scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)), \
35 #define DECLARE_AD5624R_CHANNELS(_name, _bits) \
36 const struct iio_chan_spec _name##_channels[] = { \
37 AD5624R_CHANNEL(0, _bits), \
38 AD5624R_CHANNEL(1, _bits), \
39 AD5624R_CHANNEL(2, _bits), \
40 AD5624R_CHANNEL(3, _bits), \
43 static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
44 static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
45 static DECLARE_AD5624R_CHANNELS(ad5664r, 16);
47 static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
49 .channels = ad5624r_channels,
53 .channels = ad5624r_channels,
57 .channels = ad5644r_channels,
61 .channels = ad5644r_channels,
65 .channels = ad5664r_channels,
69 .channels = ad5664r_channels,
74 static int ad5624r_spi_write(struct spi_device *spi,
75 u8 cmd, u8 addr, u16 val, u8 len)
81 * The input shift register is 24 bits wide. The first two bits are
82 * don't care bits. The next three are the command bits, C2 to C0,
83 * followed by the 3-bit DAC address, A2 to A0, and then the
84 * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
85 * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
86 * for the AD5664R, AD5644R, and AD5624R, respectively.
88 data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
93 return spi_write(spi, msg, 3);
96 static int ad5624r_read_raw(struct iio_dev *indio_dev,
97 struct iio_chan_spec const *chan,
102 struct ad5624r_state *st = iio_priv(indio_dev);
103 unsigned long scale_uv;
106 case IIO_CHAN_INFO_SCALE:
107 scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
108 *val = scale_uv / 1000;
109 *val2 = (scale_uv % 1000) * 1000;
110 return IIO_VAL_INT_PLUS_MICRO;
116 static int ad5624r_write_raw(struct iio_dev *indio_dev,
117 struct iio_chan_spec const *chan,
122 struct ad5624r_state *st = iio_priv(indio_dev);
126 case IIO_CHAN_INFO_RAW:
127 if (val >= (1 << chan->scan_type.realbits) || val < 0)
130 return ad5624r_spi_write(st->us,
131 AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
133 chan->scan_type.shift);
141 static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
142 struct device_attribute *attr, char *buf)
144 struct iio_dev *indio_dev = dev_get_drvdata(dev);
145 struct ad5624r_state *st = iio_priv(indio_dev);
147 char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
149 return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
152 static ssize_t ad5624r_write_powerdown_mode(struct device *dev,
153 struct device_attribute *attr,
154 const char *buf, size_t len)
156 struct iio_dev *indio_dev = dev_get_drvdata(dev);
157 struct ad5624r_state *st = iio_priv(indio_dev);
160 if (sysfs_streq(buf, "1kohm_to_gnd"))
161 st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
162 else if (sysfs_streq(buf, "100kohm_to_gnd"))
163 st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
164 else if (sysfs_streq(buf, "three_state"))
165 st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
169 return ret ? ret : len;
172 static ssize_t ad5624r_read_dac_powerdown(struct device *dev,
173 struct device_attribute *attr,
176 struct iio_dev *indio_dev = dev_get_drvdata(dev);
177 struct ad5624r_state *st = iio_priv(indio_dev);
178 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
180 return sprintf(buf, "%d\n",
181 !!(st->pwr_down_mask & (1 << this_attr->address)));
184 static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
185 struct device_attribute *attr,
186 const char *buf, size_t len)
190 struct iio_dev *indio_dev = dev_get_drvdata(dev);
191 struct ad5624r_state *st = iio_priv(indio_dev);
192 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
194 ret = strict_strtol(buf, 10, &readin);
199 st->pwr_down_mask |= (1 << this_attr->address);
201 st->pwr_down_mask &= ~(1 << this_attr->address);
205 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
206 (st->pwr_down_mode << 4) |
207 st->pwr_down_mask, 16);
209 return ret ? ret : len;
212 static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
213 S_IWUSR, ad5624r_read_powerdown_mode,
214 ad5624r_write_powerdown_mode, 0);
216 static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
217 "1kohm_to_gnd 100kohm_to_gnd three_state");
219 #define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
220 IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
221 S_IRUGO | S_IWUSR, _show, _store, _addr)
223 static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
224 ad5624r_write_dac_powerdown, 0);
225 static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
226 ad5624r_write_dac_powerdown, 1);
227 static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
228 ad5624r_write_dac_powerdown, 2);
229 static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
230 ad5624r_write_dac_powerdown, 3);
232 static struct attribute *ad5624r_attributes[] = {
233 &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
234 &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
235 &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
236 &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
237 &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
238 &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
242 static const struct attribute_group ad5624r_attribute_group = {
243 .attrs = ad5624r_attributes,
246 static const struct iio_info ad5624r_info = {
247 .write_raw = ad5624r_write_raw,
248 .read_raw = ad5624r_read_raw,
249 .attrs = &ad5624r_attribute_group,
250 .driver_module = THIS_MODULE,
253 static int __devinit ad5624r_probe(struct spi_device *spi)
255 struct ad5624r_state *st;
256 struct iio_dev *indio_dev;
257 int ret, voltage_uv = 0;
259 indio_dev = iio_allocate_device(sizeof(*st));
260 if (indio_dev == NULL) {
264 st = iio_priv(indio_dev);
265 st->reg = regulator_get(&spi->dev, "vcc");
266 if (!IS_ERR(st->reg)) {
267 ret = regulator_enable(st->reg);
271 voltage_uv = regulator_get_voltage(st->reg);
274 spi_set_drvdata(spi, indio_dev);
276 &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
279 st->vref_mv = voltage_uv / 1000;
281 st->vref_mv = st->chip_info->int_vref_mv;
285 indio_dev->dev.parent = &spi->dev;
286 indio_dev->name = spi_get_device_id(spi)->name;
287 indio_dev->info = &ad5624r_info;
288 indio_dev->modes = INDIO_DIRECT_MODE;
289 indio_dev->channels = st->chip_info->channels;
290 indio_dev->num_channels = AD5624R_DAC_CHANNELS;
292 ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
295 goto error_disable_reg;
297 ret = iio_device_register(indio_dev);
299 goto error_disable_reg;
304 if (!IS_ERR(st->reg))
305 regulator_disable(st->reg);
307 if (!IS_ERR(st->reg))
308 regulator_put(st->reg);
309 iio_free_device(indio_dev);
315 static int __devexit ad5624r_remove(struct spi_device *spi)
317 struct iio_dev *indio_dev = spi_get_drvdata(spi);
318 struct ad5624r_state *st = iio_priv(indio_dev);
320 iio_device_unregister(indio_dev);
321 if (!IS_ERR(st->reg)) {
322 regulator_disable(st->reg);
323 regulator_put(st->reg);
325 iio_free_device(indio_dev);
330 static const struct spi_device_id ad5624r_id[] = {
331 {"ad5624r3", ID_AD5624R3},
332 {"ad5644r3", ID_AD5644R3},
333 {"ad5664r3", ID_AD5664R3},
334 {"ad5624r5", ID_AD5624R5},
335 {"ad5644r5", ID_AD5644R5},
336 {"ad5664r5", ID_AD5664R5},
339 MODULE_DEVICE_TABLE(spi, ad5624r_id);
341 static struct spi_driver ad5624r_driver = {
344 .owner = THIS_MODULE,
346 .probe = ad5624r_probe,
347 .remove = __devexit_p(ad5624r_remove),
348 .id_table = ad5624r_id,
350 module_spi_driver(ad5624r_driver);
352 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
353 MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
354 MODULE_LICENSE("GPL v2");