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6#include <linux/bitops.h>
7#include <linux/completion.h>
8#include <linux/delay.h>
9#include <linux/err.h>
10#include <linux/iio/adc/qcom-vadc-common.h>
11#include <linux/iio/iio.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/math64.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20#include <linux/log2.h>
21
22#include <dt-bindings/iio/qcom,spmi-vadc.h>
23
24
25#define VADC_REVISION2 0x1
26#define VADC_REVISION2_SUPPORTED_VADC 1
27
28#define VADC_PERPH_TYPE 0x4
29#define VADC_PERPH_TYPE_ADC 8
30
31#define VADC_PERPH_SUBTYPE 0x5
32#define VADC_PERPH_SUBTYPE_VADC 1
33
34#define VADC_STATUS1 0x8
35#define VADC_STATUS1_OP_MODE 4
36#define VADC_STATUS1_REQ_STS BIT(1)
37#define VADC_STATUS1_EOC BIT(0)
38#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3
39
40#define VADC_MODE_CTL 0x40
41#define VADC_OP_MODE_SHIFT 3
42#define VADC_OP_MODE_NORMAL 0
43#define VADC_AMUX_TRIM_EN BIT(1)
44#define VADC_ADC_TRIM_EN BIT(0)
45
46#define VADC_EN_CTL1 0x46
47#define VADC_EN_CTL1_SET BIT(7)
48
49#define VADC_ADC_CH_SEL_CTL 0x48
50
51#define VADC_ADC_DIG_PARAM 0x50
52#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
53
54#define VADC_HW_SETTLE_DELAY 0x51
55
56#define VADC_CONV_REQ 0x52
57#define VADC_CONV_REQ_SET BIT(7)
58
59#define VADC_FAST_AVG_CTL 0x5a
60#define VADC_FAST_AVG_EN 0x5b
61#define VADC_FAST_AVG_EN_SET BIT(7)
62
63#define VADC_ACCESS 0xd0
64#define VADC_ACCESS_DATA 0xa5
65
66#define VADC_PERH_RESET_CTL3 0xda
67#define VADC_FOLLOW_WARM_RB BIT(2)
68
69#define VADC_DATA 0x60
70
71#define VADC_CHAN_MIN VADC_USBIN
72#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
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86
87struct vadc_channel_prop {
88 unsigned int channel;
89 enum vadc_calibration calibration;
90 unsigned int decimation;
91 unsigned int prescale;
92 unsigned int hw_settle_time;
93 unsigned int avg_samples;
94 enum vadc_scale_fn_type scale_fn_type;
95};
96
97
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109
110
111struct vadc_priv {
112 struct regmap *regmap;
113 struct device *dev;
114 u16 base;
115 unsigned int nchannels;
116 struct vadc_channel_prop *chan_props;
117 struct iio_chan_spec *iio_chans;
118 bool are_ref_measured;
119 bool poll_eoc;
120 struct completion complete;
121 struct vadc_linear_graph graph[2];
122 struct mutex lock;
123};
124
125static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
126 {.num = 1, .den = 1},
127 {.num = 1, .den = 3},
128 {.num = 1, .den = 4},
129 {.num = 1, .den = 6},
130 {.num = 1, .den = 20},
131 {.num = 1, .den = 8},
132 {.num = 10, .den = 81},
133 {.num = 1, .den = 10}
134};
135
136static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
137{
138 return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
139}
140
141static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
142{
143 return regmap_write(vadc->regmap, vadc->base + offset, data);
144}
145
146static int vadc_reset(struct vadc_priv *vadc)
147{
148 u8 data;
149 int ret;
150
151 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
152 if (ret)
153 return ret;
154
155 ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
156 if (ret)
157 return ret;
158
159 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
160 if (ret)
161 return ret;
162
163 data |= VADC_FOLLOW_WARM_RB;
164
165 return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
166}
167
168static int vadc_set_state(struct vadc_priv *vadc, bool state)
169{
170 return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
171}
172
173static void vadc_show_status(struct vadc_priv *vadc)
174{
175 u8 mode, sta1, chan, dig, en, req;
176 int ret;
177
178 ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
179 if (ret)
180 return;
181
182 ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
183 if (ret)
184 return;
185
186 ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
187 if (ret)
188 return;
189
190 ret = vadc_read(vadc, VADC_CONV_REQ, &req);
191 if (ret)
192 return;
193
194 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
195 if (ret)
196 return;
197
198 ret = vadc_read(vadc, VADC_EN_CTL1, &en);
199 if (ret)
200 return;
201
202 dev_err(vadc->dev,
203 "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
204 mode, en, chan, dig, req, sta1);
205}
206
207static int vadc_configure(struct vadc_priv *vadc,
208 struct vadc_channel_prop *prop)
209{
210 u8 decimation, mode_ctrl;
211 int ret;
212
213
214 mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
215 VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
216 ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
217 if (ret)
218 return ret;
219
220
221 ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
222 if (ret)
223 return ret;
224
225
226 decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
227 ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
228 if (ret)
229 return ret;
230
231
232 ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
233 if (ret)
234 return ret;
235
236 ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
237 if (ret)
238 return ret;
239
240 if (prop->avg_samples)
241 ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
242 else
243 ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
244
245 return ret;
246}
247
248static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
249{
250 unsigned int count, retry;
251 u8 sta1;
252 int ret;
253
254 retry = interval_us / VADC_CONV_TIME_MIN_US;
255
256 for (count = 0; count < retry; count++) {
257 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
258 if (ret)
259 return ret;
260
261 sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
262 if (sta1 == VADC_STATUS1_EOC)
263 return 0;
264
265 usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
266 }
267
268 vadc_show_status(vadc);
269
270 return -ETIMEDOUT;
271}
272
273static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
274{
275 int ret;
276
277 ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
278 if (ret)
279 return ret;
280
281 *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
282
283 return 0;
284}
285
286static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
287 unsigned int num)
288{
289 unsigned int i;
290
291 for (i = 0; i < vadc->nchannels; i++)
292 if (vadc->chan_props[i].channel == num)
293 return &vadc->chan_props[i];
294
295 dev_dbg(vadc->dev, "no such channel %02x\n", num);
296
297 return NULL;
298}
299
300static int vadc_do_conversion(struct vadc_priv *vadc,
301 struct vadc_channel_prop *prop, u16 *data)
302{
303 unsigned int timeout;
304 int ret;
305
306 mutex_lock(&vadc->lock);
307
308 ret = vadc_configure(vadc, prop);
309 if (ret)
310 goto unlock;
311
312 if (!vadc->poll_eoc)
313 reinit_completion(&vadc->complete);
314
315 ret = vadc_set_state(vadc, true);
316 if (ret)
317 goto unlock;
318
319 ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
320 if (ret)
321 goto err_disable;
322
323 timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
324
325 if (vadc->poll_eoc) {
326 ret = vadc_poll_wait_eoc(vadc, timeout);
327 } else {
328 ret = wait_for_completion_timeout(&vadc->complete, timeout);
329 if (!ret) {
330 ret = -ETIMEDOUT;
331 goto err_disable;
332 }
333
334
335 ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
336 if (ret)
337 goto err_disable;
338 }
339
340 ret = vadc_read_result(vadc, data);
341
342err_disable:
343 vadc_set_state(vadc, false);
344 if (ret)
345 dev_err(vadc->dev, "conversion failed\n");
346unlock:
347 mutex_unlock(&vadc->lock);
348 return ret;
349}
350
351static int vadc_measure_ref_points(struct vadc_priv *vadc)
352{
353 struct vadc_channel_prop *prop;
354 u16 read_1, read_2;
355 int ret;
356
357 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
358 vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
359
360 prop = vadc_get_channel(vadc, VADC_REF_1250MV);
361 ret = vadc_do_conversion(vadc, prop, &read_1);
362 if (ret)
363 goto err;
364
365
366 prop = vadc_get_channel(vadc, VADC_SPARE1);
367 if (!prop)
368 prop = vadc_get_channel(vadc, VADC_REF_625MV);
369
370 ret = vadc_do_conversion(vadc, prop, &read_2);
371 if (ret)
372 goto err;
373
374 if (read_1 == read_2) {
375 ret = -EINVAL;
376 goto err;
377 }
378
379 vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
380 vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
381
382
383 prop = vadc_get_channel(vadc, VADC_VDD_VADC);
384 ret = vadc_do_conversion(vadc, prop, &read_1);
385 if (ret)
386 goto err;
387
388 prop = vadc_get_channel(vadc, VADC_GND_REF);
389 ret = vadc_do_conversion(vadc, prop, &read_2);
390 if (ret)
391 goto err;
392
393 if (read_1 == read_2) {
394 ret = -EINVAL;
395 goto err;
396 }
397
398 vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
399 vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
400err:
401 if (ret)
402 dev_err(vadc->dev, "measure reference points failed\n");
403
404 return ret;
405}
406
407static int vadc_prescaling_from_dt(u32 num, u32 den)
408{
409 unsigned int pre;
410
411 for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
412 if (vadc_prescale_ratios[pre].num == num &&
413 vadc_prescale_ratios[pre].den == den)
414 break;
415
416 if (pre == ARRAY_SIZE(vadc_prescale_ratios))
417 return -EINVAL;
418
419 return pre;
420}
421
422static int vadc_hw_settle_time_from_dt(u32 value)
423{
424 if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
425 return -EINVAL;
426
427 if (value <= 1000)
428 value /= 100;
429 else
430 value = value / 2000 + 10;
431
432 return value;
433}
434
435static int vadc_avg_samples_from_dt(u32 value)
436{
437 if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
438 return -EINVAL;
439
440 return __ffs64(value);
441}
442
443static int vadc_read_raw(struct iio_dev *indio_dev,
444 struct iio_chan_spec const *chan, int *val, int *val2,
445 long mask)
446{
447 struct vadc_priv *vadc = iio_priv(indio_dev);
448 struct vadc_channel_prop *prop;
449 u16 adc_code;
450 int ret;
451
452 switch (mask) {
453 case IIO_CHAN_INFO_PROCESSED:
454 prop = &vadc->chan_props[chan->address];
455 ret = vadc_do_conversion(vadc, prop, &adc_code);
456 if (ret)
457 break;
458
459 ret = qcom_vadc_scale(prop->scale_fn_type,
460 &vadc->graph[prop->calibration],
461 &vadc_prescale_ratios[prop->prescale],
462 (prop->calibration == VADC_CALIB_ABSOLUTE),
463 adc_code, val);
464 if (ret)
465 break;
466
467 return IIO_VAL_INT;
468 case IIO_CHAN_INFO_RAW:
469 prop = &vadc->chan_props[chan->address];
470 ret = vadc_do_conversion(vadc, prop, &adc_code);
471 if (ret)
472 break;
473
474 *val = (int)adc_code;
475 return IIO_VAL_INT;
476 default:
477 ret = -EINVAL;
478 break;
479 }
480
481 return ret;
482}
483
484static int vadc_of_xlate(struct iio_dev *indio_dev,
485 const struct of_phandle_args *iiospec)
486{
487 struct vadc_priv *vadc = iio_priv(indio_dev);
488 unsigned int i;
489
490 for (i = 0; i < vadc->nchannels; i++)
491 if (vadc->iio_chans[i].channel == iiospec->args[0])
492 return i;
493
494 return -EINVAL;
495}
496
497static const struct iio_info vadc_info = {
498 .read_raw = vadc_read_raw,
499 .of_xlate = vadc_of_xlate,
500};
501
502struct vadc_channels {
503 const char *datasheet_name;
504 unsigned int prescale_index;
505 enum iio_chan_type type;
506 long info_mask;
507 enum vadc_scale_fn_type scale_fn_type;
508};
509
510#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
511 [VADC_##_dname] = { \
512 .datasheet_name = __stringify(_dname), \
513 .prescale_index = _pre, \
514 .type = _type, \
515 .info_mask = _mask, \
516 .scale_fn_type = _scale \
517 }, \
518
519#define VADC_NO_CHAN(_dname, _type, _mask, _pre) \
520 [VADC_##_dname] = { \
521 .datasheet_name = __stringify(_dname), \
522 .prescale_index = _pre, \
523 .type = _type, \
524 .info_mask = _mask \
525 },
526
527#define VADC_CHAN_TEMP(_dname, _pre, _scale) \
528 VADC_CHAN(_dname, IIO_TEMP, \
529 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \
530 _pre, _scale) \
531
532#define VADC_CHAN_VOLT(_dname, _pre, _scale) \
533 VADC_CHAN(_dname, IIO_VOLTAGE, \
534 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
535 _pre, _scale) \
536
537#define VADC_CHAN_NO_SCALE(_dname, _pre) \
538 VADC_NO_CHAN(_dname, IIO_VOLTAGE, \
539 BIT(IIO_CHAN_INFO_RAW), \
540 _pre) \
541
542
543
544
545
546
547static const struct vadc_channels vadc_chans[] = {
548 VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
549 VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
550 VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
551 VADC_CHAN_NO_SCALE(SPARE1_03, 1)
552 VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
553 VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
554 VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
555 VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
556 VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
557 VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
558 VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
559 VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
560 VADC_CHAN_NO_SCALE(SPARE1, 0)
561 VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
562 VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
563 VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
564
565 VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
566 VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
567 VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
568 VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
569 VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
570 VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
571 VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
572 VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
573 VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
574 VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
575 VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
576 VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
577 VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
578 VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
579 VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
580 VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
581
582 VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
583 VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
584 VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
585 VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
586 VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
587 VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
588 VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
589 VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
590 VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
591 VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
592 VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
593 VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
594 VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
595 VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
596 VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
597 VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
598
599 VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
600 VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT)
601 VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
602 VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
603 VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
604 VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
605 VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
606 VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
607 VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
608 VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
609 VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
610 VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
611 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
612
613 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
614 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
615 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
616 VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
617 VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
618 VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
619 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
620 VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
621 VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
622 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
623 VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
624
625 VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
626 VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
627 VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
628 VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
629 VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
630 VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
631 VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
632 VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
633 VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
634 VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
635 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
636
637 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
638 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
639 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
640 VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
641 VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
642 VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
643 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
644 VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
645 VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
646 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
647 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
648};
649
650static int vadc_get_dt_channel_data(struct device *dev,
651 struct vadc_channel_prop *prop,
652 struct device_node *node)
653{
654 const char *name = node->name;
655 u32 chan, value, varr[2];
656 int ret;
657
658 ret = of_property_read_u32(node, "reg", &chan);
659 if (ret) {
660 dev_err(dev, "invalid channel number %s\n", name);
661 return ret;
662 }
663
664 if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
665 dev_err(dev, "%s invalid channel number %d\n", name, chan);
666 return -EINVAL;
667 }
668
669
670 prop->channel = chan;
671
672 ret = of_property_read_u32(node, "qcom,decimation", &value);
673 if (!ret) {
674 ret = qcom_vadc_decimation_from_dt(value);
675 if (ret < 0) {
676 dev_err(dev, "%02x invalid decimation %d\n",
677 chan, value);
678 return ret;
679 }
680 prop->decimation = ret;
681 } else {
682 prop->decimation = VADC_DEF_DECIMATION;
683 }
684
685 ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
686 if (!ret) {
687 ret = vadc_prescaling_from_dt(varr[0], varr[1]);
688 if (ret < 0) {
689 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
690 chan, varr[0], varr[1]);
691 return ret;
692 }
693 prop->prescale = ret;
694 } else {
695 prop->prescale = vadc_chans[prop->channel].prescale_index;
696 }
697
698 ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
699 if (!ret) {
700 ret = vadc_hw_settle_time_from_dt(value);
701 if (ret < 0) {
702 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
703 chan, value);
704 return ret;
705 }
706 prop->hw_settle_time = ret;
707 } else {
708 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
709 }
710
711 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
712 if (!ret) {
713 ret = vadc_avg_samples_from_dt(value);
714 if (ret < 0) {
715 dev_err(dev, "%02x invalid avg-samples %d\n",
716 chan, value);
717 return ret;
718 }
719 prop->avg_samples = ret;
720 } else {
721 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
722 }
723
724 if (of_property_read_bool(node, "qcom,ratiometric"))
725 prop->calibration = VADC_CALIB_RATIOMETRIC;
726 else
727 prop->calibration = VADC_CALIB_ABSOLUTE;
728
729 dev_dbg(dev, "%02x name %s\n", chan, name);
730
731 return 0;
732}
733
734static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
735{
736 const struct vadc_channels *vadc_chan;
737 struct iio_chan_spec *iio_chan;
738 struct vadc_channel_prop prop;
739 struct device_node *child;
740 unsigned int index = 0;
741 int ret;
742
743 vadc->nchannels = of_get_available_child_count(node);
744 if (!vadc->nchannels)
745 return -EINVAL;
746
747 vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
748 sizeof(*vadc->iio_chans), GFP_KERNEL);
749 if (!vadc->iio_chans)
750 return -ENOMEM;
751
752 vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
753 sizeof(*vadc->chan_props), GFP_KERNEL);
754 if (!vadc->chan_props)
755 return -ENOMEM;
756
757 iio_chan = vadc->iio_chans;
758
759 for_each_available_child_of_node(node, child) {
760 ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
761 if (ret) {
762 of_node_put(child);
763 return ret;
764 }
765
766 prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
767 vadc->chan_props[index] = prop;
768
769 vadc_chan = &vadc_chans[prop.channel];
770
771 iio_chan->channel = prop.channel;
772 iio_chan->datasheet_name = vadc_chan->datasheet_name;
773 iio_chan->info_mask_separate = vadc_chan->info_mask;
774 iio_chan->type = vadc_chan->type;
775 iio_chan->indexed = 1;
776 iio_chan->address = index++;
777
778 iio_chan++;
779 }
780
781
782 if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
783 dev_err(vadc->dev, "Please define 1.25V channel\n");
784 return -ENODEV;
785 }
786
787 if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
788 dev_err(vadc->dev, "Please define 0.625V channel\n");
789 return -ENODEV;
790 }
791
792 if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
793 dev_err(vadc->dev, "Please define VDD channel\n");
794 return -ENODEV;
795 }
796
797 if (!vadc_get_channel(vadc, VADC_GND_REF)) {
798 dev_err(vadc->dev, "Please define GND channel\n");
799 return -ENODEV;
800 }
801
802 return 0;
803}
804
805static irqreturn_t vadc_isr(int irq, void *dev_id)
806{
807 struct vadc_priv *vadc = dev_id;
808
809 complete(&vadc->complete);
810
811 return IRQ_HANDLED;
812}
813
814static int vadc_check_revision(struct vadc_priv *vadc)
815{
816 u8 val;
817 int ret;
818
819 ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
820 if (ret)
821 return ret;
822
823 if (val < VADC_PERPH_TYPE_ADC) {
824 dev_err(vadc->dev, "%d is not ADC\n", val);
825 return -ENODEV;
826 }
827
828 ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
829 if (ret)
830 return ret;
831
832 if (val < VADC_PERPH_SUBTYPE_VADC) {
833 dev_err(vadc->dev, "%d is not VADC\n", val);
834 return -ENODEV;
835 }
836
837 ret = vadc_read(vadc, VADC_REVISION2, &val);
838 if (ret)
839 return ret;
840
841 if (val < VADC_REVISION2_SUPPORTED_VADC) {
842 dev_err(vadc->dev, "revision %d not supported\n", val);
843 return -ENODEV;
844 }
845
846 return 0;
847}
848
849static int vadc_probe(struct platform_device *pdev)
850{
851 struct device_node *node = pdev->dev.of_node;
852 struct device *dev = &pdev->dev;
853 struct iio_dev *indio_dev;
854 struct vadc_priv *vadc;
855 struct regmap *regmap;
856 int ret, irq_eoc;
857 u32 reg;
858
859 regmap = dev_get_regmap(dev->parent, NULL);
860 if (!regmap)
861 return -ENODEV;
862
863 ret = of_property_read_u32(node, "reg", ®);
864 if (ret < 0)
865 return ret;
866
867 indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
868 if (!indio_dev)
869 return -ENOMEM;
870
871 vadc = iio_priv(indio_dev);
872 vadc->regmap = regmap;
873 vadc->dev = dev;
874 vadc->base = reg;
875 vadc->are_ref_measured = false;
876 init_completion(&vadc->complete);
877 mutex_init(&vadc->lock);
878
879 ret = vadc_check_revision(vadc);
880 if (ret)
881 return ret;
882
883 ret = vadc_get_dt_data(vadc, node);
884 if (ret)
885 return ret;
886
887 irq_eoc = platform_get_irq(pdev, 0);
888 if (irq_eoc < 0) {
889 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
890 return irq_eoc;
891 vadc->poll_eoc = true;
892 } else {
893 ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
894 "spmi-vadc", vadc);
895 if (ret)
896 return ret;
897 }
898
899 ret = vadc_reset(vadc);
900 if (ret) {
901 dev_err(dev, "reset failed\n");
902 return ret;
903 }
904
905 ret = vadc_measure_ref_points(vadc);
906 if (ret)
907 return ret;
908
909 indio_dev->name = pdev->name;
910 indio_dev->modes = INDIO_DIRECT_MODE;
911 indio_dev->info = &vadc_info;
912 indio_dev->channels = vadc->iio_chans;
913 indio_dev->num_channels = vadc->nchannels;
914
915 return devm_iio_device_register(dev, indio_dev);
916}
917
918static const struct of_device_id vadc_match_table[] = {
919 { .compatible = "qcom,spmi-vadc" },
920 { }
921};
922MODULE_DEVICE_TABLE(of, vadc_match_table);
923
924static struct platform_driver vadc_driver = {
925 .driver = {
926 .name = "qcom-spmi-vadc",
927 .of_match_table = vadc_match_table,
928 },
929 .probe = vadc_probe,
930};
931module_platform_driver(vadc_driver);
932
933MODULE_ALIAS("platform:qcom-spmi-vadc");
934MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
935MODULE_LICENSE("GPL v2");
936MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
937MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
938
