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mm, page_alloc: set alloc_flags only once in slowpath
[linux/fpc-iii.git] / drivers / iio / adc / ad7793.c
blob847789bae821c6870f64ecc504c5b78d79558cdd
1 /*
2 * AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver
3 *
4 * Copyright 2011-2012 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2.
7 */
8
9 #include <linux/interrupt.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/sysfs.h>
14 #include <linux/spi/spi.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/err.h>
17 #include <linux/sched.h>
18 #include <linux/delay.h>
19 #include <linux/module.h>
20
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/buffer.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/trigger_consumer.h>
26 #include <linux/iio/triggered_buffer.h>
27 #include <linux/iio/adc/ad_sigma_delta.h>
28 #include <linux/platform_data/ad7793.h>
29
30 /* Registers */
31 #define AD7793_REG_COMM 0 /* Communications Register (WO, 8-bit) */
32 #define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */
33 #define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */
34 #define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit) */
35 #define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */
36 #define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */
37 #define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */
38 #define AD7793_REG_OFFSET 6 /* Offset Register (RW, 16-bit
39 * (AD7792)/24-bit (AD7793)) */
40 #define AD7793_REG_FULLSALE 7 /* Full-Scale Register
41 * (RW, 16-bit (AD7792)/24-bit (AD7793)) */
42
43 /* Communications Register Bit Designations (AD7793_REG_COMM) */
44 #define AD7793_COMM_WEN (1 << 7) /* Write Enable */
45 #define AD7793_COMM_WRITE (0 << 6) /* Write Operation */
46 #define AD7793_COMM_READ (1 << 6) /* Read Operation */
47 #define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
48 #define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */
49
50 /* Status Register Bit Designations (AD7793_REG_STAT) */
51 #define AD7793_STAT_RDY (1 << 7) /* Ready */
52 #define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */
53 #define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */
54 #define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */
55 #define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */
56
57 /* Mode Register Bit Designations (AD7793_REG_MODE) */
58 #define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */
59 #define AD7793_MODE_SEL_MASK (0x7 << 13) /* Operation Mode Select mask */
60 #define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */
61 #define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */
62
63 #define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */
64 #define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */
65 #define AD7793_MODE_IDLE 2 /* Idle Mode */
66 #define AD7793_MODE_PWRDN 3 /* Power-Down Mode */
67 #define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
68 #define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
69 #define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
70 #define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
71
72 #define AD7793_CLK_INT 0 /* Internal 64 kHz Clock not
73 * available at the CLK pin */
74 #define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clock available
75 * at the CLK pin */
76 #define AD7793_CLK_EXT 2 /* External 64 kHz Clock */
77 #define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */
78
79 /* Configuration Register Bit Designations (AD7793_REG_CONF) */
80 #define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage
81 * Generator Enable */
82 #define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */
83 #define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */
84 #define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */
85 #define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */
86 #define AD7793_CONF_REFSEL(x) ((x) << 6) /* INT/EXT Reference Select */
87 #define AD7793_CONF_BUF (1 << 4) /* Buffered Mode Enable */
88 #define AD7793_CONF_CHAN(x) ((x) & 0xf) /* Channel select */
89 #define AD7793_CONF_CHAN_MASK 0xf /* Channel select mask */
90
91 #define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */
92 #define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */
93 #define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */
94 #define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */
95 #define AD7793_CH_TEMP 6 /* Temp Sensor */
96 #define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */
97
98 #define AD7795_CH_AIN4P_AIN4M 4 /* AIN4(+) - AIN4(-) */
99 #define AD7795_CH_AIN5P_AIN5M 5 /* AIN5(+) - AIN5(-) */
100 #define AD7795_CH_AIN6P_AIN6M 6 /* AIN6(+) - AIN6(-) */
101 #define AD7795_CH_AIN1M_AIN1M 8 /* AIN1(-) - AIN1(-) */
102
103 /* ID Register Bit Designations (AD7793_REG_ID) */
104 #define AD7785_ID 0x3
105 #define AD7792_ID 0xA
106 #define AD7793_ID 0xB
107 #define AD7794_ID 0xF
108 #define AD7795_ID 0xF
109 #define AD7796_ID 0xA
110 #define AD7797_ID 0xB
111 #define AD7798_ID 0x8
112 #define AD7799_ID 0x9
113 #define AD7793_ID_MASK 0xF
114
115 /* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */
116 #define AD7793_IO_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1,
117 * IEXC2 connect to IOUT2 */
118 #define AD7793_IO_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2,
119 * IEXC2 connect to IOUT1 */
120 #define AD7793_IO_IEXC1_IEXC2_IOUT1 2 /* Both current sources
121 * IEXC1,2 connect to IOUT1 */
122 #define AD7793_IO_IEXC1_IEXC2_IOUT2 3 /* Both current sources
123 * IEXC1,2 connect to IOUT2 */
124
125 #define AD7793_IO_IXCEN_10uA (1 << 0) /* Excitation Current 10uA */
126 #define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */
127 #define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */
128
129 /* NOTE:
130 * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output.
131 * In order to avoid contentions on the SPI bus, it's therefore necessary
132 * to use spi bus locking.
133 *
134 * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
135 */
136
137 #define AD7793_FLAG_HAS_CLKSEL BIT(0)
138 #define AD7793_FLAG_HAS_REFSEL BIT(1)
139 #define AD7793_FLAG_HAS_VBIAS BIT(2)
140 #define AD7793_HAS_EXITATION_CURRENT BIT(3)
141 #define AD7793_FLAG_HAS_GAIN BIT(4)
142 #define AD7793_FLAG_HAS_BUFFER BIT(5)
143
144 struct ad7793_chip_info {
145 unsigned int id;
146 const struct iio_chan_spec *channels;
147 unsigned int num_channels;
148 unsigned int flags;
149
150 const struct iio_info *iio_info;
151 const u16 *sample_freq_avail;
152 };
153
154 struct ad7793_state {
155 const struct ad7793_chip_info *chip_info;
156 struct regulator *reg;
157 u16 int_vref_mv;
158 u16 mode;
159 u16 conf;
160 u32 scale_avail[8][2];
161
162 struct ad_sigma_delta sd;
163
164 };
165
166 enum ad7793_supported_device_ids {
167 ID_AD7785,
168 ID_AD7792,
169 ID_AD7793,
170 ID_AD7794,
171 ID_AD7795,
172 ID_AD7796,
173 ID_AD7797,
174 ID_AD7798,
175 ID_AD7799,
176 };
177
178 static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd)
179 {
180 return container_of(sd, struct ad7793_state, sd);
181 }
182
183 static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
184 {
185 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd);
186
187 st->conf &= ~AD7793_CONF_CHAN_MASK;
188 st->conf |= AD7793_CONF_CHAN(channel);
189
190 return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf);
191 }
192
193 static int ad7793_set_mode(struct ad_sigma_delta *sd,
194 enum ad_sigma_delta_mode mode)
195 {
196 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd);
197
198 st->mode &= ~AD7793_MODE_SEL_MASK;
199 st->mode |= AD7793_MODE_SEL(mode);
200
201 return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode);
202 }
203
204 static const struct ad_sigma_delta_info ad7793_sigma_delta_info = {
205 .set_channel = ad7793_set_channel,
206 .set_mode = ad7793_set_mode,
207 .has_registers = true,
208 .addr_shift = 3,
209 .read_mask = BIT(6),
210 };
211
212 static const struct ad_sd_calib_data ad7793_calib_arr[6] = {
213 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M},
214 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M},
215 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M},
216 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M},
217 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M},
218 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M}
219 };
220
221 static int ad7793_calibrate_all(struct ad7793_state *st)
222 {
223 return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr,
224 ARRAY_SIZE(ad7793_calib_arr));
225 }
226
227 static int ad7793_check_platform_data(struct ad7793_state *st,
228 const struct ad7793_platform_data *pdata)
229 {
230 if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
231 pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
232 ((pdata->exitation_current != AD7793_IX_10uA) &&
233 (pdata->exitation_current != AD7793_IX_210uA)))
234 return -EINVAL;
235
236 if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) &&
237 pdata->clock_src != AD7793_CLK_SRC_INT)
238 return -EINVAL;
239
240 if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) &&
241 pdata->refsel != AD7793_REFSEL_REFIN1)
242 return -EINVAL;
243
244 if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) &&
245 pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED)
246 return -EINVAL;
247
248 if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) &&
249 pdata->exitation_current != AD7793_IX_DISABLED)
250 return -EINVAL;
251
252 return 0;
253 }
254
255 static int ad7793_setup(struct iio_dev *indio_dev,
256 const struct ad7793_platform_data *pdata,
257 unsigned int vref_mv)
258 {
259 struct ad7793_state *st = iio_priv(indio_dev);
260 int i, ret = -1;
261 unsigned long long scale_uv;
262 u32 id;
263
264 ret = ad7793_check_platform_data(st, pdata);
265 if (ret)
266 return ret;
267
268 /* reset the serial interface */
269 ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
270 if (ret < 0)
271 goto out;
272 usleep_range(500, 2000); /* Wait for at least 500us */
273
274 /* write/read test for device presence */
275 ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id);
276 if (ret)
277 goto out;
278
279 id &= AD7793_ID_MASK;
280
281 if (id != st->chip_info->id) {
282 dev_err(&st->sd.spi->dev, "device ID query failed\n");
283 goto out;
284 }
285
286 st->mode = AD7793_MODE_RATE(1);
287 st->conf = 0;
288
289 if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL)
290 st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
291 if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL)
292 st->conf |= AD7793_CONF_REFSEL(pdata->refsel);
293 if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)
294 st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
295 if (pdata->buffered || !(st->chip_info->flags & AD7793_FLAG_HAS_BUFFER))
296 st->conf |= AD7793_CONF_BUF;
297 if (pdata->boost_enable &&
298 (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS))
299 st->conf |= AD7793_CONF_BOOST;
300 if (pdata->burnout_current)
301 st->conf |= AD7793_CONF_BO_EN;
302 if (pdata->unipolar)
303 st->conf |= AD7793_CONF_UNIPOLAR;
304
305 if (!(st->chip_info->flags & AD7793_FLAG_HAS_GAIN))
306 st->conf |= AD7793_CONF_GAIN(7);
307
308 ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE);
309 if (ret)
310 goto out;
311
312 ret = ad7793_set_channel(&st->sd, 0);
313 if (ret)
314 goto out;
315
316 if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) {
317 ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
318 pdata->exitation_current |
319 (pdata->current_source_direction << 2));
320 if (ret)
321 goto out;
322 }
323
324 ret = ad7793_calibrate_all(st);
325 if (ret)
326 goto out;
327
328 /* Populate available ADC input ranges */
329 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
330 scale_uv = ((u64)vref_mv * 100000000)
331 >> (st->chip_info->channels[0].scan_type.realbits -
332 (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1));
333 scale_uv >>= i;
334
335 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
336 st->scale_avail[i][0] = scale_uv;
337 }
338
339 return 0;
340 out:
341 dev_err(&st->sd.spi->dev, "setup failed\n");
342 return ret;
343 }
344
345 static const u16 ad7793_sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39,
346 33, 19, 17, 16, 12, 10, 8, 6, 4};
347
348 static const u16 ad7797_sample_freq_avail[16] = {0, 0, 0, 123, 62, 50, 0,
349 33, 0, 17, 16, 12, 10, 8, 6, 4};
350
351 static ssize_t ad7793_read_frequency(struct device *dev,
352 struct device_attribute *attr,
353 char *buf)
354 {
355 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
356 struct ad7793_state *st = iio_priv(indio_dev);
357
358 return sprintf(buf, "%d\n",
359 st->chip_info->sample_freq_avail[AD7793_MODE_RATE(st->mode)]);
360 }
361
362 static ssize_t ad7793_write_frequency(struct device *dev,
363 struct device_attribute *attr,
364 const char *buf,
365 size_t len)
366 {
367 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
368 struct ad7793_state *st = iio_priv(indio_dev);
369 long lval;
370 int i, ret;
371
372 ret = kstrtol(buf, 10, &lval);
373 if (ret)
374 return ret;
375
376 if (lval == 0)
377 return -EINVAL;
378
379 for (i = 0; i < 16; i++)
380 if (lval == st->chip_info->sample_freq_avail[i])
381 break;
382 if (i == 16)
383 return -EINVAL;
384
385 ret = iio_device_claim_direct_mode(indio_dev);
386 if (ret)
387 return ret;
388 st->mode &= ~AD7793_MODE_RATE(-1);
389 st->mode |= AD7793_MODE_RATE(i);
390 ad_sd_write_reg(&st->sd, AD7793_REG_MODE, sizeof(st->mode), st->mode);
391 iio_device_release_direct_mode(indio_dev);
392
393 return len;
394 }
395
396 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
397 ad7793_read_frequency,
398 ad7793_write_frequency);
399
400 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
401 "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4");
402
403 static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797,
404 sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4");
405
406 static ssize_t ad7793_show_scale_available(struct device *dev,
407 struct device_attribute *attr, char *buf)
408 {
409 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
410 struct ad7793_state *st = iio_priv(indio_dev);
411 int i, len = 0;
412
413 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
414 len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
415 st->scale_avail[i][1]);
416
417 len += sprintf(buf + len, "\n");
418
419 return len;
420 }
421
422 static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available,
423 in_voltage-voltage_scale_available, S_IRUGO,
424 ad7793_show_scale_available, NULL, 0);
425
426 static struct attribute *ad7793_attributes[] = {
427 &iio_dev_attr_sampling_frequency.dev_attr.attr,
428 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
429 &iio_dev_attr_in_m_in_scale_available.dev_attr.attr,
430 NULL
431 };
432
433 static const struct attribute_group ad7793_attribute_group = {
434 .attrs = ad7793_attributes,
435 };
436
437 static struct attribute *ad7797_attributes[] = {
438 &iio_dev_attr_sampling_frequency.dev_attr.attr,
439 &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr,
440 NULL
441 };
442
443 static const struct attribute_group ad7797_attribute_group = {
444 .attrs = ad7797_attributes,
445 };
446
447 static int ad7793_read_raw(struct iio_dev *indio_dev,
448 struct iio_chan_spec const *chan,
449 int *val,
450 int *val2,
451 long m)
452 {
453 struct ad7793_state *st = iio_priv(indio_dev);
454 int ret;
455 unsigned long long scale_uv;
456 bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR);
457
458 switch (m) {
459 case IIO_CHAN_INFO_RAW:
460 ret = ad_sigma_delta_single_conversion(indio_dev, chan, val);
461 if (ret < 0)
462 return ret;
463
464 return IIO_VAL_INT;
465
466 case IIO_CHAN_INFO_SCALE:
467 switch (chan->type) {
468 case IIO_VOLTAGE:
469 if (chan->differential) {
470 *val = st->
471 scale_avail[(st->conf >> 8) & 0x7][0];
472 *val2 = st->
473 scale_avail[(st->conf >> 8) & 0x7][1];
474 return IIO_VAL_INT_PLUS_NANO;
475 }
476 /* 1170mV / 2^23 * 6 */
477 scale_uv = (1170ULL * 1000000000ULL * 6ULL);
478 break;
479 case IIO_TEMP:
480 /* 1170mV / 0.81 mV/C / 2^23 */
481 scale_uv = 1444444444444444ULL;
482 break;
483 default:
484 return -EINVAL;
485 }
486
487 scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1));
488 *val = 0;
489 *val2 = scale_uv;
490 return IIO_VAL_INT_PLUS_NANO;
491 case IIO_CHAN_INFO_OFFSET:
492 if (!unipolar)
493 *val = -(1 << (chan->scan_type.realbits - 1));
494 else
495 *val = 0;
496
497 /* Kelvin to Celsius */
498 if (chan->type == IIO_TEMP) {
499 unsigned long long offset;
500 unsigned int shift;
501
502 shift = chan->scan_type.realbits - (unipolar ? 0 : 1);
503 offset = 273ULL << shift;
504 do_div(offset, 1444);
505 *val -= offset;
506 }
507 return IIO_VAL_INT;
508 }
509 return -EINVAL;
510 }
511
512 static int ad7793_write_raw(struct iio_dev *indio_dev,
513 struct iio_chan_spec const *chan,
514 int val,
515 int val2,
516 long mask)
517 {
518 struct ad7793_state *st = iio_priv(indio_dev);
519 int ret, i;
520 unsigned int tmp;
521
522 mutex_lock(&indio_dev->mlock);
523 if (iio_buffer_enabled(indio_dev)) {
524 mutex_unlock(&indio_dev->mlock);
525 return -EBUSY;
526 }
527
528 switch (mask) {
529 case IIO_CHAN_INFO_SCALE:
530 ret = -EINVAL;
531 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
532 if (val2 == st->scale_avail[i][1]) {
533 ret = 0;
534 tmp = st->conf;
535 st->conf &= ~AD7793_CONF_GAIN(-1);
536 st->conf |= AD7793_CONF_GAIN(i);
537
538 if (tmp == st->conf)
539 break;
540
541 ad_sd_write_reg(&st->sd, AD7793_REG_CONF,
542 sizeof(st->conf), st->conf);
543 ad7793_calibrate_all(st);
544 break;
545 }
546 break;
547 default:
548 ret = -EINVAL;
549 }
550
551 mutex_unlock(&indio_dev->mlock);
552 return ret;
553 }
554
555 static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev,
556 struct iio_chan_spec const *chan,
557 long mask)
558 {
559 return IIO_VAL_INT_PLUS_NANO;
560 }
561
562 static const struct iio_info ad7793_info = {
563 .read_raw = &ad7793_read_raw,
564 .write_raw = &ad7793_write_raw,
565 .write_raw_get_fmt = &ad7793_write_raw_get_fmt,
566 .attrs = &ad7793_attribute_group,
567 .validate_trigger = ad_sd_validate_trigger,
568 .driver_module = THIS_MODULE,
569 };
570
571 static const struct iio_info ad7797_info = {
572 .read_raw = &ad7793_read_raw,
573 .write_raw = &ad7793_write_raw,
574 .write_raw_get_fmt = &ad7793_write_raw_get_fmt,
575 .attrs = &ad7793_attribute_group,
576 .validate_trigger = ad_sd_validate_trigger,
577 .driver_module = THIS_MODULE,
578 };
579
580 #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \
581 const struct iio_chan_spec _name##_channels[] = { \
582 AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \
583 AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \
584 AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \
585 AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \
586 AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \
587 AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \
588 IIO_CHAN_SOFT_TIMESTAMP(6), \
589 }
590
591 #define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \
592 const struct iio_chan_spec _name##_channels[] = { \
593 AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
594 AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
595 AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
596 AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \
597 AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \
598 AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \
599 AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
600 AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \
601 AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
602 IIO_CHAN_SOFT_TIMESTAMP(9), \
603 }
604
605 #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \
606 const struct iio_chan_spec _name##_channels[] = { \
607 AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
608 AD_SD_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
609 AD_SD_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \
610 AD_SD_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
611 IIO_CHAN_SOFT_TIMESTAMP(4), \
612 }
613
614 #define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \
615 const struct iio_chan_spec _name##_channels[] = { \
616 AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
617 AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
618 AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
619 AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
620 AD_SD_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
621 IIO_CHAN_SOFT_TIMESTAMP(5), \
622 }
623
624 static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4);
625 static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0);
626 static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0);
627 static DECLARE_AD7795_CHANNELS(ad7794, 16, 32);
628 static DECLARE_AD7795_CHANNELS(ad7795, 24, 32);
629 static DECLARE_AD7797_CHANNELS(ad7796, 16, 16);
630 static DECLARE_AD7797_CHANNELS(ad7797, 24, 32);
631 static DECLARE_AD7799_CHANNELS(ad7798, 16, 16);
632 static DECLARE_AD7799_CHANNELS(ad7799, 24, 32);
633
634 static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
635 [ID_AD7785] = {
636 .id = AD7785_ID,
637 .channels = ad7785_channels,
638 .num_channels = ARRAY_SIZE(ad7785_channels),
639 .iio_info = &ad7793_info,
640 .sample_freq_avail = ad7793_sample_freq_avail,
641 .flags = AD7793_FLAG_HAS_CLKSEL |
642 AD7793_FLAG_HAS_REFSEL |
643 AD7793_FLAG_HAS_VBIAS |
644 AD7793_HAS_EXITATION_CURRENT |
645 AD7793_FLAG_HAS_GAIN |
646 AD7793_FLAG_HAS_BUFFER,
647 },
648 [ID_AD7792] = {
649 .id = AD7792_ID,
650 .channels = ad7792_channels,
651 .num_channels = ARRAY_SIZE(ad7792_channels),
652 .iio_info = &ad7793_info,
653 .sample_freq_avail = ad7793_sample_freq_avail,
654 .flags = AD7793_FLAG_HAS_CLKSEL |
655 AD7793_FLAG_HAS_REFSEL |
656 AD7793_FLAG_HAS_VBIAS |
657 AD7793_HAS_EXITATION_CURRENT |
658 AD7793_FLAG_HAS_GAIN |
659 AD7793_FLAG_HAS_BUFFER,
660 },
661 [ID_AD7793] = {
662 .id = AD7793_ID,
663 .channels = ad7793_channels,
664 .num_channels = ARRAY_SIZE(ad7793_channels),
665 .iio_info = &ad7793_info,
666 .sample_freq_avail = ad7793_sample_freq_avail,
667 .flags = AD7793_FLAG_HAS_CLKSEL |
668 AD7793_FLAG_HAS_REFSEL |
669 AD7793_FLAG_HAS_VBIAS |
670 AD7793_HAS_EXITATION_CURRENT |
671 AD7793_FLAG_HAS_GAIN |
672 AD7793_FLAG_HAS_BUFFER,
673 },
674 [ID_AD7794] = {
675 .id = AD7794_ID,
676 .channels = ad7794_channels,
677 .num_channels = ARRAY_SIZE(ad7794_channels),
678 .iio_info = &ad7793_info,
679 .sample_freq_avail = ad7793_sample_freq_avail,
680 .flags = AD7793_FLAG_HAS_CLKSEL |
681 AD7793_FLAG_HAS_REFSEL |
682 AD7793_FLAG_HAS_VBIAS |
683 AD7793_HAS_EXITATION_CURRENT |
684 AD7793_FLAG_HAS_GAIN |
685 AD7793_FLAG_HAS_BUFFER,
686 },
687 [ID_AD7795] = {
688 .id = AD7795_ID,
689 .channels = ad7795_channels,
690 .num_channels = ARRAY_SIZE(ad7795_channels),
691 .iio_info = &ad7793_info,
692 .sample_freq_avail = ad7793_sample_freq_avail,
693 .flags = AD7793_FLAG_HAS_CLKSEL |
694 AD7793_FLAG_HAS_REFSEL |
695 AD7793_FLAG_HAS_VBIAS |
696 AD7793_HAS_EXITATION_CURRENT |
697 AD7793_FLAG_HAS_GAIN |
698 AD7793_FLAG_HAS_BUFFER,
699 },
700 [ID_AD7796] = {
701 .id = AD7796_ID,
702 .channels = ad7796_channels,
703 .num_channels = ARRAY_SIZE(ad7796_channels),
704 .iio_info = &ad7797_info,
705 .sample_freq_avail = ad7797_sample_freq_avail,
706 .flags = AD7793_FLAG_HAS_CLKSEL,
707 },
708 [ID_AD7797] = {
709 .id = AD7797_ID,
710 .channels = ad7797_channels,
711 .num_channels = ARRAY_SIZE(ad7797_channels),
712 .iio_info = &ad7797_info,
713 .sample_freq_avail = ad7797_sample_freq_avail,
714 .flags = AD7793_FLAG_HAS_CLKSEL,
715 },
716 [ID_AD7798] = {
717 .id = AD7798_ID,
718 .channels = ad7798_channels,
719 .num_channels = ARRAY_SIZE(ad7798_channels),
720 .iio_info = &ad7793_info,
721 .sample_freq_avail = ad7793_sample_freq_avail,
722 .flags = AD7793_FLAG_HAS_GAIN |
723 AD7793_FLAG_HAS_BUFFER,
724 },
725 [ID_AD7799] = {
726 .id = AD7799_ID,
727 .channels = ad7799_channels,
728 .num_channels = ARRAY_SIZE(ad7799_channels),
729 .iio_info = &ad7793_info,
730 .sample_freq_avail = ad7793_sample_freq_avail,
731 .flags = AD7793_FLAG_HAS_GAIN |
732 AD7793_FLAG_HAS_BUFFER,
733 },
734 };
735
736 static int ad7793_probe(struct spi_device *spi)
737 {
738 const struct ad7793_platform_data *pdata = spi->dev.platform_data;
739 struct ad7793_state *st;
740 struct iio_dev *indio_dev;
741 int ret, vref_mv = 0;
742
743 if (!pdata) {
744 dev_err(&spi->dev, "no platform data?\n");
745 return -ENODEV;
746 }
747
748 if (!spi->irq) {
749 dev_err(&spi->dev, "no IRQ?\n");
750 return -ENODEV;
751 }
752
753 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
754 if (indio_dev == NULL)
755 return -ENOMEM;
756
757 st = iio_priv(indio_dev);
758
759 ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info);
760
761 if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
762 st->reg = devm_regulator_get(&spi->dev, "refin");
763 if (IS_ERR(st->reg))
764 return PTR_ERR(st->reg);
765
766 ret = regulator_enable(st->reg);
767 if (ret)
768 return ret;
769
770 vref_mv = regulator_get_voltage(st->reg);
771 if (vref_mv < 0) {
772 ret = vref_mv;
773 goto error_disable_reg;
774 }
775
776 vref_mv /= 1000;
777 } else {
778 vref_mv = 1170; /* Build-in ref */
779 }
780
781 st->chip_info =
782 &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data];
783
784 spi_set_drvdata(spi, indio_dev);
785
786 indio_dev->dev.parent = &spi->dev;
787 indio_dev->dev.of_node = spi->dev.of_node;
788 indio_dev->name = spi_get_device_id(spi)->name;
789 indio_dev->modes = INDIO_DIRECT_MODE;
790 indio_dev->channels = st->chip_info->channels;
791 indio_dev->num_channels = st->chip_info->num_channels;
792 indio_dev->info = st->chip_info->iio_info;
793
794 ret = ad_sd_setup_buffer_and_trigger(indio_dev);
795 if (ret)
796 goto error_disable_reg;
797
798 ret = ad7793_setup(indio_dev, pdata, vref_mv);
799 if (ret)
800 goto error_remove_trigger;
801
802 ret = iio_device_register(indio_dev);
803 if (ret)
804 goto error_remove_trigger;
805
806 return 0;
807
808 error_remove_trigger:
809 ad_sd_cleanup_buffer_and_trigger(indio_dev);
810 error_disable_reg:
811 if (pdata->refsel != AD7793_REFSEL_INTERNAL)
812 regulator_disable(st->reg);
813
814 return ret;
815 }
816
817 static int ad7793_remove(struct spi_device *spi)
818 {
819 const struct ad7793_platform_data *pdata = spi->dev.platform_data;
820 struct iio_dev *indio_dev = spi_get_drvdata(spi);
821 struct ad7793_state *st = iio_priv(indio_dev);
822
823 iio_device_unregister(indio_dev);
824 ad_sd_cleanup_buffer_and_trigger(indio_dev);
825
826 if (pdata->refsel != AD7793_REFSEL_INTERNAL)
827 regulator_disable(st->reg);
828
829 return 0;
830 }
831
832 static const struct spi_device_id ad7793_id[] = {
833 {"ad7785", ID_AD7785},
834 {"ad7792", ID_AD7792},
835 {"ad7793", ID_AD7793},
836 {"ad7794", ID_AD7794},
837 {"ad7795", ID_AD7795},
838 {"ad7796", ID_AD7796},
839 {"ad7797", ID_AD7797},
840 {"ad7798", ID_AD7798},
841 {"ad7799", ID_AD7799},
842 {}
843 };
844 MODULE_DEVICE_TABLE(spi, ad7793_id);
845
846 static struct spi_driver ad7793_driver = {
847 .driver = {
848 .name = "ad7793",
849 },
850 .probe = ad7793_probe,
851 .remove = ad7793_remove,
852 .id_table = ad7793_id,
853 };
854 module_spi_driver(ad7793_driver);
855
856 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
857 MODULE_DESCRIPTION("Analog Devices AD7793 and similar ADCs");
858 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support