1
2
3
4
5
6
7
8
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 len)
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 << (16 - len));
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 unsigned long scale_uv;
54
55 switch (m) {
56 case IIO_CHAN_INFO_SCALE:
57 scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
58 *val = scale_uv / 1000;
59 *val2 = (scale_uv % 1000) * 1000;
60 return IIO_VAL_INT_PLUS_MICRO;
61
62 }
63 return -EINVAL;
64}
65
66static int ad5624r_write_raw(struct iio_dev *indio_dev,
67 struct iio_chan_spec const *chan,
68 int val,
69 int val2,
70 long mask)
71{
72 struct ad5624r_state *st = iio_priv(indio_dev);
73 int ret;
74
75 switch (mask) {
76 case IIO_CHAN_INFO_RAW:
77 if (val >= (1 << chan->scan_type.realbits) || val < 0)
78 return -EINVAL;
79
80 return ad5624r_spi_write(st->us,
81 AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
82 chan->address, val,
83 chan->scan_type.shift);
84 default:
85 ret = -EINVAL;
86 }
87
88 return -EINVAL;
89}
90
91static const char * const ad5624r_powerdown_modes[] = {
92 "1kohm_to_gnd",
93 "100kohm_to_gnd",
94 "three_state"
95};
96
97static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
98 const struct iio_chan_spec *chan)
99{
100 struct ad5624r_state *st = iio_priv(indio_dev);
101
102 return st->pwr_down_mode;
103}
104
105static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
106 const struct iio_chan_spec *chan, unsigned int mode)
107{
108 struct ad5624r_state *st = iio_priv(indio_dev);
109
110 st->pwr_down_mode = mode;
111
112 return 0;
113}
114
115static const struct iio_enum ad5624r_powerdown_mode_enum = {
116 .items = ad5624r_powerdown_modes,
117 .num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
118 .get = ad5624r_get_powerdown_mode,
119 .set = ad5624r_set_powerdown_mode,
120};
121
122static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
123 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
124{
125 struct ad5624r_state *st = iio_priv(indio_dev);
126
127 return sprintf(buf, "%d\n",
128 !!(st->pwr_down_mask & (1 << chan->channel)));
129}
130
131static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,
132 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
133 size_t len)
134{
135 bool pwr_down;
136 int ret;
137 struct ad5624r_state *st = iio_priv(indio_dev);
138
139 ret = strtobool(buf, &pwr_down);
140 if (ret)
141 return ret;
142
143 if (pwr_down)
144 st->pwr_down_mask |= (1 << chan->channel);
145 else
146 st->pwr_down_mask &= ~(1 << chan->channel);
147
148 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
149 (st->pwr_down_mode << 4) |
150 st->pwr_down_mask, 16);
151
152 return ret ? ret : len;
153}
154
155static const struct iio_info ad5624r_info = {
156 .write_raw = ad5624r_write_raw,
157 .read_raw = ad5624r_read_raw,
158 .driver_module = THIS_MODULE,
159};
160
161static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
162 {
163 .name = "powerdown",
164 .read = ad5624r_read_dac_powerdown,
165 .write = ad5624r_write_dac_powerdown,
166 },
167 IIO_ENUM("powerdown_mode", true, &ad5624r_powerdown_mode_enum),
168 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
169 { },
170};
171
172#define AD5624R_CHANNEL(_chan, _bits) { \
173 .type = IIO_VOLTAGE, \
174 .indexed = 1, \
175 .output = 1, \
176 .channel = (_chan), \
177 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
178 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
179 .address = (_chan), \
180 .scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)), \
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 .owner = THIS_MODULE,
309 },
310 .probe = ad5624r_probe,
311 .remove = ad5624r_remove,
312 .id_table = ad5624r_id,
313};
314module_spi_driver(ad5624r_driver);
315
316MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
317MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
318MODULE_LICENSE("GPL v2");
319
