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9#include <linux/interrupt.h>
10#include <linux/fs.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
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21
22#include "ad5624r.h"
23
24static int ad5624r_spi_write(struct spi_device *spi,
25 u8 cmd, u8 addr, u16 val, u8 shift)
26{
27 u32 data;
28 u8 msg[3];
29
30
31
32
33
34
35
36
37
38 data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift);
39 msg[0] = data >> 16;
40 msg[1] = data >> 8;
41 msg[2] = data;
42
43 return spi_write(spi, msg, 3);
44}
45
46static int ad5624r_read_raw(struct iio_dev *indio_dev,
47 struct iio_chan_spec const *chan,
48 int *val,
49 int *val2,
50 long m)
51{
52 struct ad5624r_state *st = iio_priv(indio_dev);
53
54 switch (m) {
55 case IIO_CHAN_INFO_SCALE:
56 *val = st->vref_mv;
57 *val2 = chan->scan_type.realbits;
58 return IIO_VAL_FRACTIONAL_LOG2;
59 }
60 return -EINVAL;
61}
62
63static int ad5624r_write_raw(struct iio_dev *indio_dev,
64 struct iio_chan_spec const *chan,
65 int val,
66 int val2,
67 long mask)
68{
69 struct ad5624r_state *st = iio_priv(indio_dev);
70
71 switch (mask) {
72 case IIO_CHAN_INFO_RAW:
73 if (val >= (1 << chan->scan_type.realbits) || val < 0)
74 return -EINVAL;
75
76 return ad5624r_spi_write(st->us,
77 AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
78 chan->address, val,
79 chan->scan_type.shift);
80 default:
81 return -EINVAL;
82 }
83}
84
85static const char * const ad5624r_powerdown_modes[] = {
86 "1kohm_to_gnd",
87 "100kohm_to_gnd",
88 "three_state"
89};
90
91static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
92 const struct iio_chan_spec *chan)
93{
94 struct ad5624r_state *st = iio_priv(indio_dev);
95
96 return st->pwr_down_mode;
97}
98
99static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
100 const struct iio_chan_spec *chan, unsigned int mode)
101{
102 struct ad5624r_state *st = iio_priv(indio_dev);
103
104 st->pwr_down_mode = mode;
105
106 return 0;
107}
108
109static const struct iio_enum ad5624r_powerdown_mode_enum = {
110 .items = ad5624r_powerdown_modes,
111 .num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
112 .get = ad5624r_get_powerdown_mode,
113 .set = ad5624r_set_powerdown_mode,
114};
115
116static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
117 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
118{
119 struct ad5624r_state *st = iio_priv(indio_dev);
120
121 return sprintf(buf, "%d\n",
122 !!(st->pwr_down_mask & (1 << chan->channel)));
123}
124
125static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,
126 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
127 size_t len)
128{
129 bool pwr_down;
130 int ret;
131 struct ad5624r_state *st = iio_priv(indio_dev);
132
133 ret = strtobool(buf, &pwr_down);
134 if (ret)
135 return ret;
136
137 if (pwr_down)
138 st->pwr_down_mask |= (1 << chan->channel);
139 else
140 st->pwr_down_mask &= ~(1 << chan->channel);
141
142 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
143 (st->pwr_down_mode << 4) |
144 st->pwr_down_mask, 16);
145
146 return ret ? ret : len;
147}
148
149static const struct iio_info ad5624r_info = {
150 .write_raw = ad5624r_write_raw,
151 .read_raw = ad5624r_read_raw,
152};
153
154static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
155 {
156 .name = "powerdown",
157 .read = ad5624r_read_dac_powerdown,
158 .write = ad5624r_write_dac_powerdown,
159 .shared = IIO_SEPARATE,
160 },
161 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
162 &ad5624r_powerdown_mode_enum),
163 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
164 { },
165};
166
167#define AD5624R_CHANNEL(_chan, _bits) { \
168 .type = IIO_VOLTAGE, \
169 .indexed = 1, \
170 .output = 1, \
171 .channel = (_chan), \
172 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
173 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
174 .address = (_chan), \
175 .scan_type = { \
176 .sign = 'u', \
177 .realbits = (_bits), \
178 .storagebits = 16, \
179 .shift = 16 - (_bits), \
180 }, \
181 .ext_info = ad5624r_ext_info, \
182}
183
184#define DECLARE_AD5624R_CHANNELS(_name, _bits) \
185 const struct iio_chan_spec _name##_channels[] = { \
186 AD5624R_CHANNEL(0, _bits), \
187 AD5624R_CHANNEL(1, _bits), \
188 AD5624R_CHANNEL(2, _bits), \
189 AD5624R_CHANNEL(3, _bits), \
190}
191
192static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
193static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
194static DECLARE_AD5624R_CHANNELS(ad5664r, 16);
195
196static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
197 [ID_AD5624R3] = {
198 .channels = ad5624r_channels,
199 .int_vref_mv = 1250,
200 },
201 [ID_AD5624R5] = {
202 .channels = ad5624r_channels,
203 .int_vref_mv = 2500,
204 },
205 [ID_AD5644R3] = {
206 .channels = ad5644r_channels,
207 .int_vref_mv = 1250,
208 },
209 [ID_AD5644R5] = {
210 .channels = ad5644r_channels,
211 .int_vref_mv = 2500,
212 },
213 [ID_AD5664R3] = {
214 .channels = ad5664r_channels,
215 .int_vref_mv = 1250,
216 },
217 [ID_AD5664R5] = {
218 .channels = ad5664r_channels,
219 .int_vref_mv = 2500,
220 },
221};
222
223static int ad5624r_probe(struct spi_device *spi)
224{
225 struct ad5624r_state *st;
226 struct iio_dev *indio_dev;
227 int ret, voltage_uv = 0;
228
229 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
230 if (!indio_dev)
231 return -ENOMEM;
232 st = iio_priv(indio_dev);
233 st->reg = devm_regulator_get(&spi->dev, "vcc");
234 if (!IS_ERR(st->reg)) {
235 ret = regulator_enable(st->reg);
236 if (ret)
237 return ret;
238
239 ret = regulator_get_voltage(st->reg);
240 if (ret < 0)
241 goto error_disable_reg;
242
243 voltage_uv = ret;
244 }
245
246 spi_set_drvdata(spi, indio_dev);
247 st->chip_info =
248 &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
249
250 if (voltage_uv)
251 st->vref_mv = voltage_uv / 1000;
252 else
253 st->vref_mv = st->chip_info->int_vref_mv;
254
255 st->us = spi;
256
257 indio_dev->dev.parent = &spi->dev;
258 indio_dev->name = spi_get_device_id(spi)->name;
259 indio_dev->info = &ad5624r_info;
260 indio_dev->modes = INDIO_DIRECT_MODE;
261 indio_dev->channels = st->chip_info->channels;
262 indio_dev->num_channels = AD5624R_DAC_CHANNELS;
263
264 ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
265 !!voltage_uv, 16);
266 if (ret)
267 goto error_disable_reg;
268
269 ret = iio_device_register(indio_dev);
270 if (ret)
271 goto error_disable_reg;
272
273 return 0;
274
275error_disable_reg:
276 if (!IS_ERR(st->reg))
277 regulator_disable(st->reg);
278
279 return ret;
280}
281
282static int ad5624r_remove(struct spi_device *spi)
283{
284 struct iio_dev *indio_dev = spi_get_drvdata(spi);
285 struct ad5624r_state *st = iio_priv(indio_dev);
286
287 iio_device_unregister(indio_dev);
288 if (!IS_ERR(st->reg))
289 regulator_disable(st->reg);
290
291 return 0;
292}
293
294static const struct spi_device_id ad5624r_id[] = {
295 {"ad5624r3", ID_AD5624R3},
296 {"ad5644r3", ID_AD5644R3},
297 {"ad5664r3", ID_AD5664R3},
298 {"ad5624r5", ID_AD5624R5},
299 {"ad5644r5", ID_AD5644R5},
300 {"ad5664r5", ID_AD5664R5},
301 {}
302};
303MODULE_DEVICE_TABLE(spi, ad5624r_id);
304
305static struct spi_driver ad5624r_driver = {
306 .driver = {
307 .name = "ad5624r",
308 },
309 .probe = ad5624r_probe,
310 .remove = ad5624r_remove,
311 .id_table = ad5624r_id,
312};
313module_spi_driver(ad5624r_driver);
314
315MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
316MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
317MODULE_LICENSE("GPL v2");
318
