1 /*
2 * AD7190 AD7192 AD7195 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
20 #include <linux/iio/iio.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/buffer.h>
23 #include <linux/iio/trigger.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/triggered_buffer.h>
26 #include <linux/iio/adc/ad_sigma_delta.h>
27
28 #include "ad7192.h"
29
30 /* Registers */
31 #define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */
32 #define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */
33 #define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */
34 #define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */
35 #define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */
36 #define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */
37 #define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */
38 #define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit
39 * (AD7792)/24-bit (AD7192)) */
40 #define AD7192_REG_FULLSALE 7 /* Full-Scale Register
41 * (RW, 16-bit (AD7792)/24-bit (AD7192)) */
42
43 /* Communications Register Bit Designations (AD7192_REG_COMM) */
44 #define AD7192_COMM_WEN (1 << 7) /* Write Enable */
45 #define AD7192_COMM_WRITE (0 << 6) /* Write Operation */
46 #define AD7192_COMM_READ (1 << 6) /* Read Operation */
47 #define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
48 #define AD7192_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */
49
50 /* Status Register Bit Designations (AD7192_REG_STAT) */
51 #define AD7192_STAT_RDY (1 << 7) /* Ready */
52 #define AD7192_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */
53 #define AD7192_STAT_NOREF (1 << 5) /* Error no external reference */
54 #define AD7192_STAT_PARITY (1 << 4) /* Parity */
55 #define AD7192_STAT_CH3 (1 << 2) /* Channel 3 */
56 #define AD7192_STAT_CH2 (1 << 1) /* Channel 2 */
57 #define AD7192_STAT_CH1 (1 << 0) /* Channel 1 */
58
59 /* Mode Register Bit Designations (AD7192_REG_MODE) */
60 #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
61 #define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
62 #define AD7192_MODE_DAT_STA (1 << 20) /* Status Register transmission */
63 #define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */
64 #define AD7192_MODE_SINC3 (1 << 15) /* SINC3 Filter Select */
65 #define AD7192_MODE_ACX (1 << 14) /* AC excitation enable(AD7195 only)*/
66 #define AD7192_MODE_ENPAR (1 << 13) /* Parity Enable */
67 #define AD7192_MODE_CLKDIV (1 << 12) /* Clock divide by 2 (AD7190/2 only)*/
68 #define AD7192_MODE_SCYCLE (1 << 11) /* Single cycle conversion */
69 #define AD7192_MODE_REJ60 (1 << 10) /* 50/60Hz notch filter */
70 #define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */
71
72 /* Mode Register: AD7192_MODE_SEL options */
73 #define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */
74 #define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */
75 #define AD7192_MODE_IDLE 2 /* Idle Mode */
76 #define AD7192_MODE_PWRDN 3 /* Power-Down Mode */
77 #define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
78 #define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
79 #define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
80 #define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
81
82 /* Mode Register: AD7192_MODE_CLKSRC options */
83 #define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected
84 * from MCLK1 to MCLK2 */
85 #define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */
86 #define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not
87 * available at the MCLK2 pin */
88 #define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available
89 * at the MCLK2 pin */
90
91
92 /* Configuration Register Bit Designations (AD7192_REG_CONF) */
93
94 #define AD7192_CONF_CHOP (1 << 23) /* CHOP enable */
95 #define AD7192_CONF_REFSEL (1 << 20) /* REFIN1/REFIN2 Reference Select */
96 #define AD7192_CONF_CHAN(x) (((1 << (x)) & 0xFF) << 8) /* Channel select */
97 #define AD7192_CONF_CHAN_MASK (0xFF << 8) /* Channel select mask */
98 #define AD7192_CONF_BURN (1 << 7) /* Burnout current enable */
99 #define AD7192_CONF_REFDET (1 << 6) /* Reference detect enable */
100 #define AD7192_CONF_BUF (1 << 4) /* Buffered Mode Enable */
101 #define AD7192_CONF_UNIPOLAR (1 << 3) /* Unipolar/Bipolar Enable */
102 #define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */
103
104 #define AD7192_CH_AIN1P_AIN2M 0 /* AIN1(+) - AIN2(-) */
105 #define AD7192_CH_AIN3P_AIN4M 1 /* AIN3(+) - AIN4(-) */
106 #define AD7192_CH_TEMP 2 /* Temp Sensor */
107 #define AD7192_CH_AIN2P_AIN2M 3 /* AIN2(+) - AIN2(-) */
108 #define AD7192_CH_AIN1 4 /* AIN1 - AINCOM */
109 #define AD7192_CH_AIN2 5 /* AIN2 - AINCOM */
110 #define AD7192_CH_AIN3 6 /* AIN3 - AINCOM */
111 #define AD7192_CH_AIN4 7 /* AIN4 - AINCOM */
112
113 /* ID Register Bit Designations (AD7192_REG_ID) */
114 #define ID_AD7190 0x4
115 #define ID_AD7192 0x0
116 #define ID_AD7195 0x6
117 #define AD7192_ID_MASK 0x0F
118
119 /* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */
120 #define AD7192_GPOCON_BPDSW (1 << 6) /* Bridge power-down switch enable */
121 #define AD7192_GPOCON_GP32EN (1 << 5) /* Digital Output P3 and P2 enable */
122 #define AD7192_GPOCON_GP10EN (1 << 4) /* Digital Output P1 and P0 enable */
123 #define AD7192_GPOCON_P3DAT (1 << 3) /* P3 state */
124 #define AD7192_GPOCON_P2DAT (1 << 2) /* P2 state */
125 #define AD7192_GPOCON_P1DAT (1 << 1) /* P1 state */
126 #define AD7192_GPOCON_P0DAT (1 << 0) /* P0 state */
127
128 #define AD7192_INT_FREQ_MHz 4915200
129
130 /* NOTE:
131 * The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
132 * In order to avoid contentions on the SPI bus, it's therefore necessary
133 * to use spi bus locking.
134 *
135 * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
136 */
137
138 struct ad7192_state {
139 struct regulator *reg;
140 u16 int_vref_mv;
141 u32 mclk;
142 u32 f_order;
143 u32 mode;
144 u32 conf;
145 u32 scale_avail[8][2];
146 u8 gpocon;
147 u8 devid;
148
149 struct ad_sigma_delta sd;
150 };
151
ad_sigma_delta_to_ad7192(struct ad_sigma_delta * sd)152 static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd)
153 {
154 return container_of(sd, struct ad7192_state, sd);
155 }
156
ad7192_set_channel(struct ad_sigma_delta * sd,unsigned int channel)157 static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
158 {
159 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
160
161 st->conf &= ~AD7192_CONF_CHAN_MASK;
162 st->conf |= AD7192_CONF_CHAN(channel);
163
164 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
165 }
166
ad7192_set_mode(struct ad_sigma_delta * sd,enum ad_sigma_delta_mode mode)167 static int ad7192_set_mode(struct ad_sigma_delta *sd,
168 enum ad_sigma_delta_mode mode)
169 {
170 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
171
172 st->mode &= ~AD7192_MODE_SEL_MASK;
173 st->mode |= AD7192_MODE_SEL(mode);
174
175 return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
176 }
177
178 static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
179 .set_channel = ad7192_set_channel,
180 .set_mode = ad7192_set_mode,
181 .has_registers = true,
182 .addr_shift = 3,
183 .read_mask = BIT(6),
184 };
185
186 static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
187 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1},
188 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1},
189 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2},
190 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2},
191 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3},
192 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3},
193 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4},
194 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4}
195 };
196
ad7192_calibrate_all(struct ad7192_state * st)197 static int ad7192_calibrate_all(struct ad7192_state *st)
198 {
199 return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr,
200 ARRAY_SIZE(ad7192_calib_arr));
201 }
202
ad7192_setup(struct ad7192_state * st,const struct ad7192_platform_data * pdata)203 static int ad7192_setup(struct ad7192_state *st,
204 const struct ad7192_platform_data *pdata)
205 {
206 struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
207 unsigned long long scale_uv;
208 int i, ret, id;
209 u8 ones[6];
210
211 /* reset the serial interface */
212 memset(&ones, 0xFF, 6);
213 ret = spi_write(st->sd.spi, &ones, 6);
214 if (ret < 0)
215 goto out;
216 msleep(1); /* Wait for at least 500us */
217
218 /* write/read test for device presence */
219 ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
220 if (ret)
221 goto out;
222
223 id &= AD7192_ID_MASK;
224
225 if (id != st->devid)
226 dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n", id);
227
228 switch (pdata->clock_source_sel) {
229 case AD7192_CLK_EXT_MCLK1_2:
230 case AD7192_CLK_EXT_MCLK2:
231 st->mclk = AD7192_INT_FREQ_MHz;
232 break;
233 case AD7192_CLK_INT:
234 case AD7192_CLK_INT_CO:
235 if (pdata->ext_clk_Hz)
236 st->mclk = pdata->ext_clk_Hz;
237 else
238 st->mclk = AD7192_INT_FREQ_MHz;
239 break;
240 default:
241 ret = -EINVAL;
242 goto out;
243 }
244
245 st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
246 AD7192_MODE_CLKSRC(pdata->clock_source_sel) |
247 AD7192_MODE_RATE(480);
248
249 st->conf = AD7192_CONF_GAIN(0);
250
251 if (pdata->rej60_en)
252 st->mode |= AD7192_MODE_REJ60;
253
254 if (pdata->sinc3_en)
255 st->mode |= AD7192_MODE_SINC3;
256
257 if (pdata->refin2_en && (st->devid != ID_AD7195))
258 st->conf |= AD7192_CONF_REFSEL;
259
260 if (pdata->chop_en) {
261 st->conf |= AD7192_CONF_CHOP;
262 if (pdata->sinc3_en)
263 st->f_order = 3; /* SINC 3rd order */
264 else
265 st->f_order = 4; /* SINC 4th order */
266 } else {
267 st->f_order = 1;
268 }
269
270 if (pdata->buf_en)
271 st->conf |= AD7192_CONF_BUF;
272
273 if (pdata->unipolar_en)
274 st->conf |= AD7192_CONF_UNIPOLAR;
275
276 if (pdata->burnout_curr_en)
277 st->conf |= AD7192_CONF_BURN;
278
279 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
280 if (ret)
281 goto out;
282
283 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
284 if (ret)
285 goto out;
286
287 ret = ad7192_calibrate_all(st);
288 if (ret)
289 goto out;
290
291 /* Populate available ADC input ranges */
292 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
293 scale_uv = ((u64)st->int_vref_mv * 100000000)
294 >> (indio_dev->channels[0].scan_type.realbits -
295 ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
296 scale_uv >>= i;
297
298 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
299 st->scale_avail[i][0] = scale_uv;
300 }
301
302 return 0;
303 out:
304 dev_err(&st->sd.spi->dev, "setup failed\n");
305 return ret;
306 }
307
ad7192_read_frequency(struct device * dev,struct device_attribute * attr,char * buf)308 static ssize_t ad7192_read_frequency(struct device *dev,
309 struct device_attribute *attr,
310 char *buf)
311 {
312 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
313 struct ad7192_state *st = iio_priv(indio_dev);
314
315 return sprintf(buf, "%d\n", st->mclk /
316 (st->f_order * 1024 * AD7192_MODE_RATE(st->mode)));
317 }
318
ad7192_write_frequency(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)319 static ssize_t ad7192_write_frequency(struct device *dev,
320 struct device_attribute *attr,
321 const char *buf,
322 size_t len)
323 {
324 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
325 struct ad7192_state *st = iio_priv(indio_dev);
326 unsigned long lval;
327 int div, ret;
328
329 ret = strict_strtoul(buf, 10, &lval);
330 if (ret)
331 return ret;
332 if (lval == 0)
333 return -EINVAL;
334
335 mutex_lock(&indio_dev->mlock);
336 if (iio_buffer_enabled(indio_dev)) {
337 mutex_unlock(&indio_dev->mlock);
338 return -EBUSY;
339 }
340
341 div = st->mclk / (lval * st->f_order * 1024);
342 if (div < 1 || div > 1023) {
343 ret = -EINVAL;
344 goto out;
345 }
346
347 st->mode &= ~AD7192_MODE_RATE(-1);
348 st->mode |= AD7192_MODE_RATE(div);
349 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
350
351 out:
352 mutex_unlock(&indio_dev->mlock);
353
354 return ret ? ret : len;
355 }
356
357 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
358 ad7192_read_frequency,
359 ad7192_write_frequency);
360
ad7192_show_scale_available(struct device * dev,struct device_attribute * attr,char * buf)361 static ssize_t ad7192_show_scale_available(struct device *dev,
362 struct device_attribute *attr, char *buf)
363 {
364 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
365 struct ad7192_state *st = iio_priv(indio_dev);
366 int i, len = 0;
367
368 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
369 len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
370 st->scale_avail[i][1]);
371
372 len += sprintf(buf + len, "\n");
373
374 return len;
375 }
376
377 static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
378 in_voltage-voltage_scale_available,
379 S_IRUGO, ad7192_show_scale_available, NULL, 0);
380
381 static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,
382 ad7192_show_scale_available, NULL, 0);
383
ad7192_show_ac_excitation(struct device * dev,struct device_attribute * attr,char * buf)384 static ssize_t ad7192_show_ac_excitation(struct device *dev,
385 struct device_attribute *attr,
386 char *buf)
387 {
388 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
389 struct ad7192_state *st = iio_priv(indio_dev);
390
391 return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
392 }
393
ad7192_show_bridge_switch(struct device * dev,struct device_attribute * attr,char * buf)394 static ssize_t ad7192_show_bridge_switch(struct device *dev,
395 struct device_attribute *attr,
396 char *buf)
397 {
398 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
399 struct ad7192_state *st = iio_priv(indio_dev);
400
401 return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
402 }
403
ad7192_set(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)404 static ssize_t ad7192_set(struct device *dev,
405 struct device_attribute *attr,
406 const char *buf,
407 size_t len)
408 {
409 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
410 struct ad7192_state *st = iio_priv(indio_dev);
411 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
412 int ret;
413 bool val;
414
415 ret = strtobool(buf, &val);
416 if (ret < 0)
417 return ret;
418
419 mutex_lock(&indio_dev->mlock);
420 if (iio_buffer_enabled(indio_dev)) {
421 mutex_unlock(&indio_dev->mlock);
422 return -EBUSY;
423 }
424
425 switch ((u32) this_attr->address) {
426 case AD7192_REG_GPOCON:
427 if (val)
428 st->gpocon |= AD7192_GPOCON_BPDSW;
429 else
430 st->gpocon &= ~AD7192_GPOCON_BPDSW;
431
432 ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon);
433 break;
434 case AD7192_REG_MODE:
435 if (val)
436 st->mode |= AD7192_MODE_ACX;
437 else
438 st->mode &= ~AD7192_MODE_ACX;
439
440 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
441 break;
442 default:
443 ret = -EINVAL;
444 }
445
446 mutex_unlock(&indio_dev->mlock);
447
448 return ret ? ret : len;
449 }
450
451 static IIO_DEVICE_ATTR(bridge_switch_en, S_IRUGO | S_IWUSR,
452 ad7192_show_bridge_switch, ad7192_set,
453 AD7192_REG_GPOCON);
454
455 static IIO_DEVICE_ATTR(ac_excitation_en, S_IRUGO | S_IWUSR,
456 ad7192_show_ac_excitation, ad7192_set,
457 AD7192_REG_MODE);
458
459 static struct attribute *ad7192_attributes[] = {
460 &iio_dev_attr_sampling_frequency.dev_attr.attr,
461 &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
462 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
463 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
464 &iio_dev_attr_ac_excitation_en.dev_attr.attr,
465 NULL
466 };
467
468 static const struct attribute_group ad7192_attribute_group = {
469 .attrs = ad7192_attributes,
470 };
471
472 static struct attribute *ad7195_attributes[] = {
473 &iio_dev_attr_sampling_frequency.dev_attr.attr,
474 &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
475 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
476 &iio_dev_attr_bridge_switch_en.dev_attr.attr,
477 NULL
478 };
479
480 static const struct attribute_group ad7195_attribute_group = {
481 .attrs = ad7195_attributes,
482 };
483
ad7192_get_temp_scale(bool unipolar)484 static unsigned int ad7192_get_temp_scale(bool unipolar)
485 {
486 return unipolar ? 2815 * 2 : 2815;
487 }
488
ad7192_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long m)489 static int ad7192_read_raw(struct iio_dev *indio_dev,
490 struct iio_chan_spec const *chan,
491 int *val,
492 int *val2,
493 long m)
494 {
495 struct ad7192_state *st = iio_priv(indio_dev);
496 bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
497
498 switch (m) {
499 case IIO_CHAN_INFO_RAW:
500 return ad_sigma_delta_single_conversion(indio_dev, chan, val);
501 case IIO_CHAN_INFO_SCALE:
502 switch (chan->type) {
503 case IIO_VOLTAGE:
504 mutex_lock(&indio_dev->mlock);
505 *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
506 *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
507 mutex_unlock(&indio_dev->mlock);
508 return IIO_VAL_INT_PLUS_NANO;
509 case IIO_TEMP:
510 *val = 0;
511 *val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
512 return IIO_VAL_INT_PLUS_NANO;
513 default:
514 return -EINVAL;
515 }
516 case IIO_CHAN_INFO_OFFSET:
517 if (!unipolar)
518 *val = -(1 << (chan->scan_type.realbits - 1));
519 else
520 *val = 0;
521 /* Kelvin to Celsius */
522 if (chan->type == IIO_TEMP)
523 *val -= 273 * ad7192_get_temp_scale(unipolar);
524 return IIO_VAL_INT;
525 }
526
527 return -EINVAL;
528 }
529
ad7192_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)530 static int ad7192_write_raw(struct iio_dev *indio_dev,
531 struct iio_chan_spec const *chan,
532 int val,
533 int val2,
534 long mask)
535 {
536 struct ad7192_state *st = iio_priv(indio_dev);
537 int ret, i;
538 unsigned int tmp;
539
540 mutex_lock(&indio_dev->mlock);
541 if (iio_buffer_enabled(indio_dev)) {
542 mutex_unlock(&indio_dev->mlock);
543 return -EBUSY;
544 }
545
546 switch (mask) {
547 case IIO_CHAN_INFO_SCALE:
548 ret = -EINVAL;
549 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
550 if (val2 == st->scale_avail[i][1]) {
551 ret = 0;
552 tmp = st->conf;
553 st->conf &= ~AD7192_CONF_GAIN(-1);
554 st->conf |= AD7192_CONF_GAIN(i);
555 if (tmp == st->conf)
556 break;
557 ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
558 3, st->conf);
559 ad7192_calibrate_all(st);
560 break;
561 }
562 break;
563 default:
564 ret = -EINVAL;
565 }
566
567 mutex_unlock(&indio_dev->mlock);
568
569 return ret;
570 }
571
ad7192_write_raw_get_fmt(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,long mask)572 static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
573 struct iio_chan_spec const *chan,
574 long mask)
575 {
576 return IIO_VAL_INT_PLUS_NANO;
577 }
578
579 static const struct iio_info ad7192_info = {
580 .read_raw = &ad7192_read_raw,
581 .write_raw = &ad7192_write_raw,
582 .write_raw_get_fmt = &ad7192_write_raw_get_fmt,
583 .attrs = &ad7192_attribute_group,
584 .validate_trigger = ad_sd_validate_trigger,
585 .driver_module = THIS_MODULE,
586 };
587
588 static const struct iio_info ad7195_info = {
589 .read_raw = &ad7192_read_raw,
590 .write_raw = &ad7192_write_raw,
591 .write_raw_get_fmt = &ad7192_write_raw_get_fmt,
592 .attrs = &ad7195_attribute_group,
593 .validate_trigger = ad_sd_validate_trigger,
594 .driver_module = THIS_MODULE,
595 };
596
597 static const struct iio_chan_spec ad7192_channels[] = {
598 AD_SD_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M, 24, 32, 0),
599 AD_SD_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M, 24, 32, 0),
600 AD_SD_TEMP_CHANNEL(2, AD7192_CH_TEMP, 24, 32, 0),
601 AD_SD_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M, 24, 32, 0),
602 AD_SD_CHANNEL(4, 1, AD7192_CH_AIN1, 24, 32, 0),
603 AD_SD_CHANNEL(5, 2, AD7192_CH_AIN2, 24, 32, 0),
604 AD_SD_CHANNEL(6, 3, AD7192_CH_AIN3, 24, 32, 0),
605 AD_SD_CHANNEL(7, 4, AD7192_CH_AIN4, 24, 32, 0),
606 IIO_CHAN_SOFT_TIMESTAMP(8),
607 };
608
ad7192_probe(struct spi_device * spi)609 static int ad7192_probe(struct spi_device *spi)
610 {
611 const struct ad7192_platform_data *pdata = spi->dev.platform_data;
612 struct ad7192_state *st;
613 struct iio_dev *indio_dev;
614 int ret , voltage_uv = 0;
615
616 if (!pdata) {
617 dev_err(&spi->dev, "no platform data?\n");
618 return -ENODEV;
619 }
620
621 if (!spi->irq) {
622 dev_err(&spi->dev, "no IRQ?\n");
623 return -ENODEV;
624 }
625
626 indio_dev = iio_device_alloc(sizeof(*st));
627 if (indio_dev == NULL)
628 return -ENOMEM;
629
630 st = iio_priv(indio_dev);
631
632 st->reg = regulator_get(&spi->dev, "vcc");
633 if (!IS_ERR(st->reg)) {
634 ret = regulator_enable(st->reg);
635 if (ret)
636 goto error_put_reg;
637
638 voltage_uv = regulator_get_voltage(st->reg);
639 }
640
641 if (pdata && pdata->vref_mv)
642 st->int_vref_mv = pdata->vref_mv;
643 else if (voltage_uv)
644 st->int_vref_mv = voltage_uv / 1000;
645 else
646 dev_warn(&spi->dev, "reference voltage undefined\n");
647
648 spi_set_drvdata(spi, indio_dev);
649 st->devid = spi_get_device_id(spi)->driver_data;
650 indio_dev->dev.parent = &spi->dev;
651 indio_dev->name = spi_get_device_id(spi)->name;
652 indio_dev->modes = INDIO_DIRECT_MODE;
653 indio_dev->channels = ad7192_channels;
654 indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
655 if (st->devid == ID_AD7195)
656 indio_dev->info = &ad7195_info;
657 else
658 indio_dev->info = &ad7192_info;
659
660 ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
661
662 ret = ad_sd_setup_buffer_and_trigger(indio_dev);
663 if (ret)
664 goto error_disable_reg;
665
666 ret = ad7192_setup(st, pdata);
667 if (ret)
668 goto error_remove_trigger;
669
670 ret = iio_device_register(indio_dev);
671 if (ret < 0)
672 goto error_remove_trigger;
673 return 0;
674
675 error_remove_trigger:
676 ad_sd_cleanup_buffer_and_trigger(indio_dev);
677 error_disable_reg:
678 if (!IS_ERR(st->reg))
679 regulator_disable(st->reg);
680 error_put_reg:
681 if (!IS_ERR(st->reg))
682 regulator_put(st->reg);
683
684 iio_device_free(indio_dev);
685
686 return ret;
687 }
688
ad7192_remove(struct spi_device * spi)689 static int ad7192_remove(struct spi_device *spi)
690 {
691 struct iio_dev *indio_dev = spi_get_drvdata(spi);
692 struct ad7192_state *st = iio_priv(indio_dev);
693
694 iio_device_unregister(indio_dev);
695 ad_sd_cleanup_buffer_and_trigger(indio_dev);
696
697 if (!IS_ERR(st->reg)) {
698 regulator_disable(st->reg);
699 regulator_put(st->reg);
700 }
701
702 return 0;
703 }
704
705 static const struct spi_device_id ad7192_id[] = {
706 {"ad7190", ID_AD7190},
707 {"ad7192", ID_AD7192},
708 {"ad7195", ID_AD7195},
709 {}
710 };
711 MODULE_DEVICE_TABLE(spi, ad7192_id);
712
713 static struct spi_driver ad7192_driver = {
714 .driver = {
715 .name = "ad7192",
716 .owner = THIS_MODULE,
717 },
718 .probe = ad7192_probe,
719 .remove = ad7192_remove,
720 .id_table = ad7192_id,
721 };
722 module_spi_driver(ad7192_driver);
723
724 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
725 MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7195 ADC");
726 MODULE_LICENSE("GPL v2");
727