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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/bitops.h>
7#include <linux/completion.h>
8#include <linux/delay.h>
9#include <linux/err.h>
10#include <linux/iio/iio.h>
11#include <linux/interrupt.h>
12#include <linux/kernel.h>
13#include <linux/math64.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/regmap.h>
18#include <linux/slab.h>
19#include <linux/log2.h>
20
21#include <dt-bindings/iio/qcom,spmi-vadc.h>
22
23#include "qcom-vadc-common.h"
24
25/* VADC register and bit definitions */
26#define VADC_REVISION2 0x1
27#define VADC_REVISION2_SUPPORTED_VADC 1
28
29#define VADC_PERPH_TYPE 0x4
30#define VADC_PERPH_TYPE_ADC 8
31
32#define VADC_PERPH_SUBTYPE 0x5
33#define VADC_PERPH_SUBTYPE_VADC 1
34
35#define VADC_STATUS1 0x8
36#define VADC_STATUS1_OP_MODE 4
37#define VADC_STATUS1_REQ_STS BIT(1)
38#define VADC_STATUS1_EOC BIT(0)
39#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3
40
41#define VADC_MODE_CTL 0x40
42#define VADC_OP_MODE_SHIFT 3
43#define VADC_OP_MODE_NORMAL 0
44#define VADC_AMUX_TRIM_EN BIT(1)
45#define VADC_ADC_TRIM_EN BIT(0)
46
47#define VADC_EN_CTL1 0x46
48#define VADC_EN_CTL1_SET BIT(7)
49
50#define VADC_ADC_CH_SEL_CTL 0x48
51
52#define VADC_ADC_DIG_PARAM 0x50
53#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
54
55#define VADC_HW_SETTLE_DELAY 0x51
56
57#define VADC_CONV_REQ 0x52
58#define VADC_CONV_REQ_SET BIT(7)
59
60#define VADC_FAST_AVG_CTL 0x5a
61#define VADC_FAST_AVG_EN 0x5b
62#define VADC_FAST_AVG_EN_SET BIT(7)
63
64#define VADC_ACCESS 0xd0
65#define VADC_ACCESS_DATA 0xa5
66
67#define VADC_PERH_RESET_CTL3 0xda
68#define VADC_FOLLOW_WARM_RB BIT(2)
69
70#define VADC_DATA 0x60 /* 16 bits */
71
72#define VADC_CHAN_MIN VADC_USBIN
73#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
74
75/**
76 * struct vadc_channel_prop - VADC channel property.
77 * @channel: channel number, refer to the channel list.
78 * @calibration: calibration type.
79 * @decimation: sampling rate supported for the channel.
80 * @prescale: channel scaling performed on the input signal.
81 * @hw_settle_time: the time between AMUX being configured and the
82 * start of conversion.
83 * @avg_samples: ability to provide single result from the ADC
84 * that is an average of multiple measurements.
85 * @scale_fn_type: Represents the scaling function to convert voltage
86 * physical units desired by the client for the channel.
87 */
88struct vadc_channel_prop {
89 unsigned int channel;
90 enum vadc_calibration calibration;
91 unsigned int decimation;
92 unsigned int prescale;
93 unsigned int hw_settle_time;
94 unsigned int avg_samples;
95 enum vadc_scale_fn_type scale_fn_type;
96};
97
98/**
99 * struct vadc_priv - VADC private structure.
100 * @regmap: pointer to struct regmap.
101 * @dev: pointer to struct device.
102 * @base: base address for the ADC peripheral.
103 * @nchannels: number of VADC channels.
104 * @chan_props: array of VADC channel properties.
105 * @iio_chans: array of IIO channels specification.
106 * @are_ref_measured: are reference points measured.
107 * @poll_eoc: use polling instead of interrupt.
108 * @complete: VADC result notification after interrupt is received.
109 * @graph: store parameters for calibration.
110 * @lock: ADC lock for access to the peripheral.
111 */
112struct vadc_priv {
113 struct regmap *regmap;
114 struct device *dev;
115 u16 base;
116 unsigned int nchannels;
117 struct vadc_channel_prop *chan_props;
118 struct iio_chan_spec *iio_chans;
119 bool are_ref_measured;
120 bool poll_eoc;
121 struct completion complete;
122 struct vadc_linear_graph graph[2];
123 struct mutex lock;
124};
125
126static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
127 {.num = 1, .den = 1},
128 {.num = 1, .den = 3},
129 {.num = 1, .den = 4},
130 {.num = 1, .den = 6},
131 {.num = 1, .den = 20},
132 {.num = 1, .den = 8},
133 {.num = 10, .den = 81},
134 {.num = 1, .den = 10}
135};
136
137static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
138{
139 return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
140}
141
142static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
143{
144 return regmap_write(vadc->regmap, vadc->base + offset, data);
145}
146
147static int vadc_reset(struct vadc_priv *vadc)
148{
149 u8 data;
150 int ret;
151
152 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
153 if (ret)
154 return ret;
155
156 ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
157 if (ret)
158 return ret;
159
160 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
161 if (ret)
162 return ret;
163
164 data |= VADC_FOLLOW_WARM_RB;
165
166 return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
167}
168
169static int vadc_set_state(struct vadc_priv *vadc, bool state)
170{
171 return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
172}
173
174static void vadc_show_status(struct vadc_priv *vadc)
175{
176 u8 mode, sta1, chan, dig, en, req;
177 int ret;
178
179 ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
180 if (ret)
181 return;
182
183 ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
184 if (ret)
185 return;
186
187 ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
188 if (ret)
189 return;
190
191 ret = vadc_read(vadc, VADC_CONV_REQ, &req);
192 if (ret)
193 return;
194
195 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
196 if (ret)
197 return;
198
199 ret = vadc_read(vadc, VADC_EN_CTL1, &en);
200 if (ret)
201 return;
202
203 dev_err(vadc->dev,
204 "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
205 mode, en, chan, dig, req, sta1);
206}
207
208static int vadc_configure(struct vadc_priv *vadc,
209 struct vadc_channel_prop *prop)
210{
211 u8 decimation, mode_ctrl;
212 int ret;
213
214 /* Mode selection */
215 mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
216 VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
217 ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
218 if (ret)
219 return ret;
220
221 /* Channel selection */
222 ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
223 if (ret)
224 return ret;
225
226 /* Digital parameter setup */
227 decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
228 ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
229 if (ret)
230 return ret;
231
232 /* HW settle time delay */
233 ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
234 if (ret)
235 return ret;
236
237 ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
238 if (ret)
239 return ret;
240
241 if (prop->avg_samples)
242 ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
243 else
244 ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
245
246 return ret;
247}
248
249static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
250{
251 unsigned int count, retry;
252 u8 sta1;
253 int ret;
254
255 retry = interval_us / VADC_CONV_TIME_MIN_US;
256
257 for (count = 0; count < retry; count++) {
258 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
259 if (ret)
260 return ret;
261
262 sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
263 if (sta1 == VADC_STATUS1_EOC)
264 return 0;
265
266 usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
267 }
268
269 vadc_show_status(vadc);
270
271 return -ETIMEDOUT;
272}
273
274static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
275{
276 int ret;
277
278 ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
279 if (ret)
280 return ret;
281
282 *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
283
284 return 0;
285}
286
287static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
288 unsigned int num)
289{
290 unsigned int i;
291
292 for (i = 0; i < vadc->nchannels; i++)
293 if (vadc->chan_props[i].channel == num)
294 return &vadc->chan_props[i];
295
296 dev_dbg(vadc->dev, "no such channel %02x\n", num);
297
298 return NULL;
299}
300
301static int vadc_do_conversion(struct vadc_priv *vadc,
302 struct vadc_channel_prop *prop, u16 *data)
303{
304 unsigned int timeout;
305 int ret;
306
307 mutex_lock(&vadc->lock);
308
309 ret = vadc_configure(vadc, prop);
310 if (ret)
311 goto unlock;
312
313 if (!vadc->poll_eoc)
314 reinit_completion(&vadc->complete);
315
316 ret = vadc_set_state(vadc, true);
317 if (ret)
318 goto unlock;
319
320 ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
321 if (ret)
322 goto err_disable;
323
324 timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
325
326 if (vadc->poll_eoc) {
327 ret = vadc_poll_wait_eoc(vadc, timeout);
328 } else {
329 ret = wait_for_completion_timeout(&vadc->complete, timeout);
330 if (!ret) {
331 ret = -ETIMEDOUT;
332 goto err_disable;
333 }
334
335 /* Double check conversion status */
336 ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
337 if (ret)
338 goto err_disable;
339 }
340
341 ret = vadc_read_result(vadc, data);
342
343err_disable:
344 vadc_set_state(vadc, false);
345 if (ret)
346 dev_err(vadc->dev, "conversion failed\n");
347unlock:
348 mutex_unlock(&vadc->lock);
349 return ret;
350}
351
352static int vadc_measure_ref_points(struct vadc_priv *vadc)
353{
354 struct vadc_channel_prop *prop;
355 u16 read_1, read_2;
356 int ret;
357
358 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
359 vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
360
361 prop = vadc_get_channel(vadc, VADC_REF_1250MV);
362 ret = vadc_do_conversion(vadc, prop, &read_1);
363 if (ret)
364 goto err;
365
366 /* Try with buffered 625mV channel first */
367 prop = vadc_get_channel(vadc, VADC_SPARE1);
368 if (!prop)
369 prop = vadc_get_channel(vadc, VADC_REF_625MV);
370
371 ret = vadc_do_conversion(vadc, prop, &read_2);
372 if (ret)
373 goto err;
374
375 if (read_1 == read_2) {
376 ret = -EINVAL;
377 goto err;
378 }
379
380 vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
381 vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
382
383 /* Ratiometric calibration */
384 prop = vadc_get_channel(vadc, VADC_VDD_VADC);
385 ret = vadc_do_conversion(vadc, prop, &read_1);
386 if (ret)
387 goto err;
388
389 prop = vadc_get_channel(vadc, VADC_GND_REF);
390 ret = vadc_do_conversion(vadc, prop, &read_2);
391 if (ret)
392 goto err;
393
394 if (read_1 == read_2) {
395 ret = -EINVAL;
396 goto err;
397 }
398
399 vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
400 vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
401err:
402 if (ret)
403 dev_err(vadc->dev, "measure reference points failed\n");
404
405 return ret;
406}
407
408static int vadc_prescaling_from_dt(u32 num, u32 den)
409{
410 unsigned int pre;
411
412 for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
413 if (vadc_prescale_ratios[pre].num == num &&
414 vadc_prescale_ratios[pre].den == den)
415 break;
416
417 if (pre == ARRAY_SIZE(vadc_prescale_ratios))
418 return -EINVAL;
419
420 return pre;
421}
422
423static int vadc_hw_settle_time_from_dt(u32 value)
424{
425 if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
426 return -EINVAL;
427
428 if (value <= 1000)
429 value /= 100;
430 else
431 value = value / 2000 + 10;
432
433 return value;
434}
435
436static int vadc_avg_samples_from_dt(u32 value)
437{
438 if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
439 return -EINVAL;
440
441 return __ffs64(value);
442}
443
444static int vadc_read_raw(struct iio_dev *indio_dev,
445 struct iio_chan_spec const *chan, int *val, int *val2,
446 long mask)
447{
448 struct vadc_priv *vadc = iio_priv(indio_dev);
449 struct vadc_channel_prop *prop;
450 u16 adc_code;
451 int ret;
452
453 switch (mask) {
454 case IIO_CHAN_INFO_PROCESSED:
455 prop = &vadc->chan_props[chan->address];
456 ret = vadc_do_conversion(vadc, prop, &adc_code);
457 if (ret)
458 break;
459
460 ret = qcom_vadc_scale(prop->scale_fn_type,
461 &vadc->graph[prop->calibration],
462 &vadc_prescale_ratios[prop->prescale],
463 (prop->calibration == VADC_CALIB_ABSOLUTE),
464 adc_code, val);
465 if (ret)
466 break;
467
468 return IIO_VAL_INT;
469 case IIO_CHAN_INFO_RAW:
470 prop = &vadc->chan_props[chan->address];
471 ret = vadc_do_conversion(vadc, prop, &adc_code);
472 if (ret)
473 break;
474
475 *val = (int)adc_code;
476 return IIO_VAL_INT;
477 default:
478 ret = -EINVAL;
479 break;
480 }
481
482 return ret;
483}
484
485static int vadc_of_xlate(struct iio_dev *indio_dev,
486 const struct of_phandle_args *iiospec)
487{
488 struct vadc_priv *vadc = iio_priv(indio_dev);
489 unsigned int i;
490
491 for (i = 0; i < vadc->nchannels; i++)
492 if (vadc->iio_chans[i].channel == iiospec->args[0])
493 return i;
494
495 return -EINVAL;
496}
497
498static const struct iio_info vadc_info = {
499 .read_raw = vadc_read_raw,
500 .of_xlate = vadc_of_xlate,
501};
502
503struct vadc_channels {
504 const char *datasheet_name;
505 unsigned int prescale_index;
506 enum iio_chan_type type;
507 long info_mask;
508 enum vadc_scale_fn_type scale_fn_type;
509};
510
511#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
512 [VADC_##_dname] = { \
513 .datasheet_name = __stringify(_dname), \
514 .prescale_index = _pre, \
515 .type = _type, \
516 .info_mask = _mask, \
517 .scale_fn_type = _scale \
518 }, \
519
520#define VADC_NO_CHAN(_dname, _type, _mask, _pre) \
521 [VADC_##_dname] = { \
522 .datasheet_name = __stringify(_dname), \
523 .prescale_index = _pre, \
524 .type = _type, \
525 .info_mask = _mask \
526 },
527
528#define VADC_CHAN_TEMP(_dname, _pre, _scale) \
529 VADC_CHAN(_dname, IIO_TEMP, \
530 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \
531 _pre, _scale) \
532
533#define VADC_CHAN_VOLT(_dname, _pre, _scale) \
534 VADC_CHAN(_dname, IIO_VOLTAGE, \
535 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
536 _pre, _scale) \
537
538#define VADC_CHAN_NO_SCALE(_dname, _pre) \
539 VADC_NO_CHAN(_dname, IIO_VOLTAGE, \
540 BIT(IIO_CHAN_INFO_RAW), \
541 _pre) \
542
543/*
544 * The array represents all possible ADC channels found in the supported PMICs.
545 * Every index in the array is equal to the channel number per datasheet. The
546 * gaps in the array should be treated as reserved channels.
547 */
548static const struct vadc_channels vadc_chans[] = {
549 VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
550 VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
551 VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
552 VADC_CHAN_NO_SCALE(SPARE1_03, 1)
553 VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
554 VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
555 VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
556 VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
557 VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
558 VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
559 VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
560 VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
561 VADC_CHAN_NO_SCALE(SPARE1, 0)
562 VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
563 VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
564 VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
565
566 VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
567 VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
568 VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
569 VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
570 VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
571 VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
572 VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
573 VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
574 VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
575 VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
576 VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
577 VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
578 VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
579 VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
580 VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
581 VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
582
583 VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
584 VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
585 VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
586 VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
587 VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
588 VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
589 VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
590 VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
591 VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
592 VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
593 VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
594 VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
595 VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
596 VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
597 VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
598 VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
599
600 VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
601 VADC_CHAN_NO_SCALE(LR_MUX2_BAT_ID, 0)
602 VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
603 VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
604 VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
605 VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
606 VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
607 VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
608 VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
609 VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
610 VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
611 VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
612 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
613
614 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
615 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
616 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
617 VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
618 VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
619 VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
620 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
621 VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
622 VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
623 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
624 VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
625
626 VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
627 VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
628 VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
629 VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
630 VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
631 VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
632 VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
633 VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
634 VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
635 VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
636 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
637
638 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
639 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
640 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
641 VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
642 VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
643 VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
644 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
645 VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
646 VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
647 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
648 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
649};
650
651static int vadc_get_dt_channel_data(struct device *dev,
652 struct vadc_channel_prop *prop,
653 struct device_node *node)
654{
655 const char *name = node->name;
656 u32 chan, value, varr[2];
657 int ret;
658
659 ret = of_property_read_u32(node, "reg", &chan);
660 if (ret) {
661 dev_err(dev, "invalid channel number %s\n", name);
662 return ret;
663 }
664
665 if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
666 dev_err(dev, "%s invalid channel number %d\n", name, chan);
667 return -EINVAL;
668 }
669
670 /* the channel has DT description */
671 prop->channel = chan;
672
673 ret = of_property_read_u32(node, "qcom,decimation", &value);
674 if (!ret) {
675 ret = qcom_vadc_decimation_from_dt(value);
676 if (ret < 0) {
677 dev_err(dev, "%02x invalid decimation %d\n",
678 chan, value);
679 return ret;
680 }
681 prop->decimation = ret;
682 } else {
683 prop->decimation = VADC_DEF_DECIMATION;
684 }
685
686 ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
687 if (!ret) {
688 ret = vadc_prescaling_from_dt(varr[0], varr[1]);
689 if (ret < 0) {
690 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
691 chan, varr[0], varr[1]);
692 return ret;
693 }
694 prop->prescale = ret;
695 } else {
696 prop->prescale = vadc_chans[prop->channel].prescale_index;
697 }
698
699 ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
700 if (!ret) {
701 ret = vadc_hw_settle_time_from_dt(value);
702 if (ret < 0) {
703 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
704 chan, value);
705 return ret;
706 }
707 prop->hw_settle_time = ret;
708 } else {
709 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
710 }
711
712 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
713 if (!ret) {
714 ret = vadc_avg_samples_from_dt(value);
715 if (ret < 0) {
716 dev_err(dev, "%02x invalid avg-samples %d\n",
717 chan, value);
718 return ret;
719 }
720 prop->avg_samples = ret;
721 } else {
722 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
723 }
724
725 if (of_property_read_bool(node, "qcom,ratiometric"))
726 prop->calibration = VADC_CALIB_RATIOMETRIC;
727 else
728 prop->calibration = VADC_CALIB_ABSOLUTE;
729
730 dev_dbg(dev, "%02x name %s\n", chan, name);
731
732 return 0;
733}
734
735static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
736{
737 const struct vadc_channels *vadc_chan;
738 struct iio_chan_spec *iio_chan;
739 struct vadc_channel_prop prop;
740 struct device_node *child;
741 unsigned int index = 0;
742 int ret;
743
744 vadc->nchannels = of_get_available_child_count(node);
745 if (!vadc->nchannels)
746 return -EINVAL;
747
748 vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
749 sizeof(*vadc->iio_chans), GFP_KERNEL);
750 if (!vadc->iio_chans)
751 return -ENOMEM;
752
753 vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
754 sizeof(*vadc->chan_props), GFP_KERNEL);
755 if (!vadc->chan_props)
756 return -ENOMEM;
757
758 iio_chan = vadc->iio_chans;
759
760 for_each_available_child_of_node(node, child) {
761 ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
762 if (ret) {
763 of_node_put(child);
764 return ret;
765 }
766
767 prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
768 vadc->chan_props[index] = prop;
769
770 vadc_chan = &vadc_chans[prop.channel];
771
772 iio_chan->channel = prop.channel;
773 iio_chan->datasheet_name = vadc_chan->datasheet_name;
774 iio_chan->info_mask_separate = vadc_chan->info_mask;
775 iio_chan->type = vadc_chan->type;
776 iio_chan->indexed = 1;
777 iio_chan->address = index++;
778
779 iio_chan++;
780 }
781
782 /* These channels are mandatory, they are used as reference points */
783 if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
784 dev_err(vadc->dev, "Please define 1.25V channel\n");
785 return -ENODEV;
786 }
787
788 if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
789 dev_err(vadc->dev, "Please define 0.625V channel\n");
790 return -ENODEV;
791 }
792
793 if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
794 dev_err(vadc->dev, "Please define VDD channel\n");
795 return -ENODEV;
796 }
797
798 if (!vadc_get_channel(vadc, VADC_GND_REF)) {
799 dev_err(vadc->dev, "Please define GND channel\n");
800 return -ENODEV;
801 }
802
803 return 0;
804}
805
806static irqreturn_t vadc_isr(int irq, void *dev_id)
807{
808 struct vadc_priv *vadc = dev_id;
809
810 complete(&vadc->complete);
811
812 return IRQ_HANDLED;
813}
814
815static int vadc_check_revision(struct vadc_priv *vadc)
816{
817 u8 val;
818 int ret;
819
820 ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
821 if (ret)
822 return ret;
823
824 if (val < VADC_PERPH_TYPE_ADC) {
825 dev_err(vadc->dev, "%d is not ADC\n", val);
826 return -ENODEV;
827 }
828
829 ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
830 if (ret)
831 return ret;
832
833 if (val < VADC_PERPH_SUBTYPE_VADC) {
834 dev_err(vadc->dev, "%d is not VADC\n", val);
835 return -ENODEV;
836 }
837
838 ret = vadc_read(vadc, VADC_REVISION2, &val);
839 if (ret)
840 return ret;
841
842 if (val < VADC_REVISION2_SUPPORTED_VADC) {
843 dev_err(vadc->dev, "revision %d not supported\n", val);
844 return -ENODEV;
845 }
846
847 return 0;
848}
849
850static int vadc_probe(struct platform_device *pdev)
851{
852 struct device_node *node = pdev->dev.of_node;
853 struct device *dev = &pdev->dev;
854 struct iio_dev *indio_dev;
855 struct vadc_priv *vadc;
856 struct regmap *regmap;
857 int ret, irq_eoc;
858 u32 reg;
859
860 regmap = dev_get_regmap(dev->parent, NULL);
861 if (!regmap)
862 return -ENODEV;
863
864 ret = of_property_read_u32(node, "reg", ®);
865 if (ret < 0)
866 return ret;
867
868 indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
869 if (!indio_dev)
870 return -ENOMEM;
871
872 vadc = iio_priv(indio_dev);
873 vadc->regmap = regmap;
874 vadc->dev = dev;
875 vadc->base = reg;
876 vadc->are_ref_measured = false;
877 init_completion(&vadc->complete);
878 mutex_init(&vadc->lock);
879
880 ret = vadc_check_revision(vadc);
881 if (ret)
882 return ret;
883
884 ret = vadc_get_dt_data(vadc, node);
885 if (ret)
886 return ret;
887
888 irq_eoc = platform_get_irq(pdev, 0);
889 if (irq_eoc < 0) {
890 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
891 return irq_eoc;
892 vadc->poll_eoc = true;
893 } else {
894 ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
895 "spmi-vadc", vadc);
896 if (ret)
897 return ret;
898 }
899
900 ret = vadc_reset(vadc);
901 if (ret) {
902 dev_err(dev, "reset failed\n");
903 return ret;
904 }
905
906 ret = vadc_measure_ref_points(vadc);
907 if (ret)
908 return ret;
909
910 indio_dev->dev.parent = dev;
911 indio_dev->dev.of_node = node;
912 indio_dev->name = pdev->name;
913 indio_dev->modes = INDIO_DIRECT_MODE;
914 indio_dev->info = &vadc_info;
915 indio_dev->channels = vadc->iio_chans;
916 indio_dev->num_channels = vadc->nchannels;
917
918 return devm_iio_device_register(dev, indio_dev);
919}
920
921static const struct of_device_id vadc_match_table[] = {
922 { .compatible = "qcom,spmi-vadc" },
923 { }
924};
925MODULE_DEVICE_TABLE(of, vadc_match_table);
926
927static struct platform_driver vadc_driver = {
928 .driver = {
929 .name = "qcom-spmi-vadc",
930 .of_match_table = vadc_match_table,
931 },
932 .probe = vadc_probe,
933};
934module_platform_driver(vadc_driver);
935
936MODULE_ALIAS("platform:qcom-spmi-vadc");
937MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
938MODULE_LICENSE("GPL v2");
939MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
940MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
4 */
5
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/mod_devicetable.h>
17#include <linux/platform_device.h>
18#include <linux/property.h>
19#include <linux/regmap.h>
20#include <linux/slab.h>
21#include <linux/log2.h>
22
23#include <dt-bindings/iio/qcom,spmi-vadc.h>
24
25/* VADC register and bit definitions */
26#define VADC_REVISION2 0x1
27#define VADC_REVISION2_SUPPORTED_VADC 1
28
29#define VADC_PERPH_TYPE 0x4
30#define VADC_PERPH_TYPE_ADC 8
31
32#define VADC_PERPH_SUBTYPE 0x5
33#define VADC_PERPH_SUBTYPE_VADC 1
34
35#define VADC_STATUS1 0x8
36#define VADC_STATUS1_OP_MODE 4
37#define VADC_STATUS1_REQ_STS BIT(1)
38#define VADC_STATUS1_EOC BIT(0)
39#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3
40
41#define VADC_MODE_CTL 0x40
42#define VADC_OP_MODE_SHIFT 3
43#define VADC_OP_MODE_NORMAL 0
44#define VADC_AMUX_TRIM_EN BIT(1)
45#define VADC_ADC_TRIM_EN BIT(0)
46
47#define VADC_EN_CTL1 0x46
48#define VADC_EN_CTL1_SET BIT(7)
49
50#define VADC_ADC_CH_SEL_CTL 0x48
51
52#define VADC_ADC_DIG_PARAM 0x50
53#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
54
55#define VADC_HW_SETTLE_DELAY 0x51
56
57#define VADC_CONV_REQ 0x52
58#define VADC_CONV_REQ_SET BIT(7)
59
60#define VADC_FAST_AVG_CTL 0x5a
61#define VADC_FAST_AVG_EN 0x5b
62#define VADC_FAST_AVG_EN_SET BIT(7)
63
64#define VADC_ACCESS 0xd0
65#define VADC_ACCESS_DATA 0xa5
66
67#define VADC_PERH_RESET_CTL3 0xda
68#define VADC_FOLLOW_WARM_RB BIT(2)
69
70#define VADC_DATA 0x60 /* 16 bits */
71
72#define VADC_CHAN_MIN VADC_USBIN
73#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
74
75/**
76 * struct vadc_channel_prop - VADC channel property.
77 * @channel: channel number, refer to the channel list.
78 * @calibration: calibration type.
79 * @decimation: sampling rate supported for the channel.
80 * @prescale: channel scaling performed on the input signal.
81 * @hw_settle_time: the time between AMUX being configured and the
82 * start of conversion.
83 * @avg_samples: ability to provide single result from the ADC
84 * that is an average of multiple measurements.
85 * @scale_fn_type: Represents the scaling function to convert voltage
86 * physical units desired by the client for the channel.
87 * @channel_name: Channel name used in device tree.
88 */
89struct vadc_channel_prop {
90 unsigned int channel;
91 enum vadc_calibration calibration;
92 unsigned int decimation;
93 unsigned int prescale;
94 unsigned int hw_settle_time;
95 unsigned int avg_samples;
96 enum vadc_scale_fn_type scale_fn_type;
97 const char *channel_name;
98};
99
100/**
101 * struct vadc_priv - VADC private structure.
102 * @regmap: pointer to struct regmap.
103 * @dev: pointer to struct device.
104 * @base: base address for the ADC peripheral.
105 * @nchannels: number of VADC channels.
106 * @chan_props: array of VADC channel properties.
107 * @iio_chans: array of IIO channels specification.
108 * @are_ref_measured: are reference points measured.
109 * @poll_eoc: use polling instead of interrupt.
110 * @complete: VADC result notification after interrupt is received.
111 * @graph: store parameters for calibration.
112 * @lock: ADC lock for access to the peripheral.
113 */
114struct vadc_priv {
115 struct regmap *regmap;
116 struct device *dev;
117 u16 base;
118 unsigned int nchannels;
119 struct vadc_channel_prop *chan_props;
120 struct iio_chan_spec *iio_chans;
121 bool are_ref_measured;
122 bool poll_eoc;
123 struct completion complete;
124 struct vadc_linear_graph graph[2];
125 struct mutex lock;
126};
127
128static const struct u32_fract vadc_prescale_ratios[] = {
129 { .numerator = 1, .denominator = 1 },
130 { .numerator = 1, .denominator = 3 },
131 { .numerator = 1, .denominator = 4 },
132 { .numerator = 1, .denominator = 6 },
133 { .numerator = 1, .denominator = 20 },
134 { .numerator = 1, .denominator = 8 },
135 { .numerator = 10, .denominator = 81 },
136 { .numerator = 1, .denominator = 10 },
137};
138
139static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
140{
141 return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
142}
143
144static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
145{
146 return regmap_write(vadc->regmap, vadc->base + offset, data);
147}
148
149static int vadc_reset(struct vadc_priv *vadc)
150{
151 u8 data;
152 int ret;
153
154 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
155 if (ret)
156 return ret;
157
158 ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
159 if (ret)
160 return ret;
161
162 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
163 if (ret)
164 return ret;
165
166 data |= VADC_FOLLOW_WARM_RB;
167
168 return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
169}
170
171static int vadc_set_state(struct vadc_priv *vadc, bool state)
172{
173 return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
174}
175
176static void vadc_show_status(struct vadc_priv *vadc)
177{
178 u8 mode, sta1, chan, dig, en, req;
179 int ret;
180
181 ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
182 if (ret)
183 return;
184
185 ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
186 if (ret)
187 return;
188
189 ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
190 if (ret)
191 return;
192
193 ret = vadc_read(vadc, VADC_CONV_REQ, &req);
194 if (ret)
195 return;
196
197 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
198 if (ret)
199 return;
200
201 ret = vadc_read(vadc, VADC_EN_CTL1, &en);
202 if (ret)
203 return;
204
205 dev_err(vadc->dev,
206 "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
207 mode, en, chan, dig, req, sta1);
208}
209
210static int vadc_configure(struct vadc_priv *vadc,
211 struct vadc_channel_prop *prop)
212{
213 u8 decimation, mode_ctrl;
214 int ret;
215
216 /* Mode selection */
217 mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
218 VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
219 ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
220 if (ret)
221 return ret;
222
223 /* Channel selection */
224 ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
225 if (ret)
226 return ret;
227
228 /* Digital parameter setup */
229 decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
230 ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
231 if (ret)
232 return ret;
233
234 /* HW settle time delay */
235 ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
236 if (ret)
237 return ret;
238
239 ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
240 if (ret)
241 return ret;
242
243 if (prop->avg_samples)
244 ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
245 else
246 ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
247
248 return ret;
249}
250
251static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
252{
253 unsigned int count, retry;
254 u8 sta1;
255 int ret;
256
257 retry = interval_us / VADC_CONV_TIME_MIN_US;
258
259 for (count = 0; count < retry; count++) {
260 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
261 if (ret)
262 return ret;
263
264 sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
265 if (sta1 == VADC_STATUS1_EOC)
266 return 0;
267
268 usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
269 }
270
271 vadc_show_status(vadc);
272
273 return -ETIMEDOUT;
274}
275
276static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
277{
278 int ret;
279
280 ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
281 if (ret)
282 return ret;
283
284 *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
285
286 return 0;
287}
288
289static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
290 unsigned int num)
291{
292 unsigned int i;
293
294 for (i = 0; i < vadc->nchannels; i++)
295 if (vadc->chan_props[i].channel == num)
296 return &vadc->chan_props[i];
297
298 dev_dbg(vadc->dev, "no such channel %02x\n", num);
299
300 return NULL;
301}
302
303static int vadc_do_conversion(struct vadc_priv *vadc,
304 struct vadc_channel_prop *prop, u16 *data)
305{
306 unsigned int timeout;
307 int ret;
308
309 mutex_lock(&vadc->lock);
310
311 ret = vadc_configure(vadc, prop);
312 if (ret)
313 goto unlock;
314
315 if (!vadc->poll_eoc)
316 reinit_completion(&vadc->complete);
317
318 ret = vadc_set_state(vadc, true);
319 if (ret)
320 goto unlock;
321
322 ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
323 if (ret)
324 goto err_disable;
325
326 timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
327
328 if (vadc->poll_eoc) {
329 ret = vadc_poll_wait_eoc(vadc, timeout);
330 } else {
331 ret = wait_for_completion_timeout(&vadc->complete, timeout);
332 if (!ret) {
333 ret = -ETIMEDOUT;
334 goto err_disable;
335 }
336
337 /* Double check conversion status */
338 ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
339 if (ret)
340 goto err_disable;
341 }
342
343 ret = vadc_read_result(vadc, data);
344
345err_disable:
346 vadc_set_state(vadc, false);
347 if (ret)
348 dev_err(vadc->dev, "conversion failed\n");
349unlock:
350 mutex_unlock(&vadc->lock);
351 return ret;
352}
353
354static int vadc_measure_ref_points(struct vadc_priv *vadc)
355{
356 struct vadc_channel_prop *prop;
357 u16 read_1, read_2;
358 int ret;
359
360 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
361 vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
362
363 prop = vadc_get_channel(vadc, VADC_REF_1250MV);
364 ret = vadc_do_conversion(vadc, prop, &read_1);
365 if (ret)
366 goto err;
367
368 /* Try with buffered 625mV channel first */
369 prop = vadc_get_channel(vadc, VADC_SPARE1);
370 if (!prop)
371 prop = vadc_get_channel(vadc, VADC_REF_625MV);
372
373 ret = vadc_do_conversion(vadc, prop, &read_2);
374 if (ret)
375 goto err;
376
377 if (read_1 == read_2) {
378 ret = -EINVAL;
379 goto err;
380 }
381
382 vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
383 vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
384
385 /* Ratiometric calibration */
386 prop = vadc_get_channel(vadc, VADC_VDD_VADC);
387 ret = vadc_do_conversion(vadc, prop, &read_1);
388 if (ret)
389 goto err;
390
391 prop = vadc_get_channel(vadc, VADC_GND_REF);
392 ret = vadc_do_conversion(vadc, prop, &read_2);
393 if (ret)
394 goto err;
395
396 if (read_1 == read_2) {
397 ret = -EINVAL;
398 goto err;
399 }
400
401 vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
402 vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
403err:
404 if (ret)
405 dev_err(vadc->dev, "measure reference points failed\n");
406
407 return ret;
408}
409
410static int vadc_prescaling_from_dt(u32 numerator, u32 denominator)
411{
412 unsigned int pre;
413
414 for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
415 if (vadc_prescale_ratios[pre].numerator == numerator &&
416 vadc_prescale_ratios[pre].denominator == denominator)
417 break;
418
419 if (pre == ARRAY_SIZE(vadc_prescale_ratios))
420 return -EINVAL;
421
422 return pre;
423}
424
425static int vadc_hw_settle_time_from_dt(u32 value)
426{
427 if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
428 return -EINVAL;
429
430 if (value <= 1000)
431 value /= 100;
432 else
433 value = value / 2000 + 10;
434
435 return value;
436}
437
438static int vadc_avg_samples_from_dt(u32 value)
439{
440 if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
441 return -EINVAL;
442
443 return __ffs64(value);
444}
445
446static int vadc_read_raw(struct iio_dev *indio_dev,
447 struct iio_chan_spec const *chan, int *val, int *val2,
448 long mask)
449{
450 struct vadc_priv *vadc = iio_priv(indio_dev);
451 struct vadc_channel_prop *prop;
452 u16 adc_code;
453 int ret;
454
455 switch (mask) {
456 case IIO_CHAN_INFO_PROCESSED:
457 prop = &vadc->chan_props[chan->address];
458 ret = vadc_do_conversion(vadc, prop, &adc_code);
459 if (ret)
460 break;
461
462 ret = qcom_vadc_scale(prop->scale_fn_type,
463 &vadc->graph[prop->calibration],
464 &vadc_prescale_ratios[prop->prescale],
465 (prop->calibration == VADC_CALIB_ABSOLUTE),
466 adc_code, val);
467 if (ret)
468 break;
469
470 return IIO_VAL_INT;
471 case IIO_CHAN_INFO_RAW:
472 prop = &vadc->chan_props[chan->address];
473 ret = vadc_do_conversion(vadc, prop, &adc_code);
474 if (ret)
475 break;
476
477 *val = (int)adc_code;
478 return IIO_VAL_INT;
479 default:
480 ret = -EINVAL;
481 break;
482 }
483
484 return ret;
485}
486
487static int vadc_fwnode_xlate(struct iio_dev *indio_dev,
488 const struct fwnode_reference_args *iiospec)
489{
490 struct vadc_priv *vadc = iio_priv(indio_dev);
491 unsigned int i;
492
493 for (i = 0; i < vadc->nchannels; i++)
494 if (vadc->iio_chans[i].channel == iiospec->args[0])
495 return i;
496
497 return -EINVAL;
498}
499
500static int vadc_read_label(struct iio_dev *indio_dev,
501 struct iio_chan_spec const *chan, char *label)
502{
503 struct vadc_priv *vadc = iio_priv(indio_dev);
504 const char *name = vadc->chan_props[chan->address].channel_name;
505
506 return sysfs_emit(label, "%s\n", name);
507}
508
509static const struct iio_info vadc_info = {
510 .read_raw = vadc_read_raw,
511 .read_label = vadc_read_label,
512 .fwnode_xlate = vadc_fwnode_xlate,
513};
514
515struct vadc_channels {
516 const char *datasheet_name;
517 unsigned int prescale_index;
518 enum iio_chan_type type;
519 long info_mask;
520 enum vadc_scale_fn_type scale_fn_type;
521};
522
523#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
524 [VADC_##_dname] = { \
525 .datasheet_name = __stringify(_dname), \
526 .prescale_index = _pre, \
527 .type = _type, \
528 .info_mask = _mask, \
529 .scale_fn_type = _scale \
530 }, \
531
532#define VADC_NO_CHAN(_dname, _type, _mask, _pre) \
533 [VADC_##_dname] = { \
534 .datasheet_name = __stringify(_dname), \
535 .prescale_index = _pre, \
536 .type = _type, \
537 .info_mask = _mask \
538 },
539
540#define VADC_CHAN_TEMP(_dname, _pre, _scale) \
541 VADC_CHAN(_dname, IIO_TEMP, \
542 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \
543 _pre, _scale) \
544
545#define VADC_CHAN_VOLT(_dname, _pre, _scale) \
546 VADC_CHAN(_dname, IIO_VOLTAGE, \
547 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
548 _pre, _scale) \
549
550#define VADC_CHAN_NO_SCALE(_dname, _pre) \
551 VADC_NO_CHAN(_dname, IIO_VOLTAGE, \
552 BIT(IIO_CHAN_INFO_RAW), \
553 _pre) \
554
555/*
556 * The array represents all possible ADC channels found in the supported PMICs.
557 * Every index in the array is equal to the channel number per datasheet. The
558 * gaps in the array should be treated as reserved channels.
559 */
560static const struct vadc_channels vadc_chans[] = {
561 VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
562 VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
563 VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
564 VADC_CHAN_NO_SCALE(SPARE1_03, 1)
565 VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
566 VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
567 VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
568 VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
569 VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
570 VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
571 VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
572 VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
573 VADC_CHAN_NO_SCALE(SPARE1, 0)
574 VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
575 VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
576 VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
577
578 VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
579 VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
580 VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
581 VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
582 VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
583 VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
584 VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
585 VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
586 VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
587 VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
588 VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
589 VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
590 VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
591 VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
592 VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
593 VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
594
595 VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
596 VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
597 VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
598 VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
599 VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
600 VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
601 VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
602 VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
603 VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
604 VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
605 VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
606 VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
607 VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
608 VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
609 VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
610 VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
611
612 VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
613 VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT)
614 VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
615 VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
616 VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
617 VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
618 VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
619 VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
620 VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
621 VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
622 VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
623 VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
624 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
625
626 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
627 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
628 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
629 VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
630 VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
631 VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
632 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
633 VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
634 VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
635 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
636 VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
637
638 VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
639 VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
640 VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
641 VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
642 VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
643 VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
644 VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
645 VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
646 VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
647 VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
648 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
649
650 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
651 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
652 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
653 VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
654 VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
655 VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
656 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
657 VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
658 VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
659 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
660 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
661};
662
663static int vadc_get_fw_channel_data(struct device *dev,
664 struct vadc_channel_prop *prop,
665 struct fwnode_handle *fwnode)
666{
667 const char *name = fwnode_get_name(fwnode), *label;
668 u32 chan, value, varr[2];
669 int ret;
670
671 ret = fwnode_property_read_u32(fwnode, "reg", &chan);
672 if (ret) {
673 dev_err(dev, "invalid channel number %s\n", name);
674 return ret;
675 }
676
677 if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
678 dev_err(dev, "%s invalid channel number %d\n", name, chan);
679 return -EINVAL;
680 }
681
682 ret = fwnode_property_read_string(fwnode, "label", &label);
683 if (ret)
684 label = vadc_chans[chan].datasheet_name;
685 prop->channel_name = label;
686
687 /* the channel has DT description */
688 prop->channel = chan;
689
690 ret = fwnode_property_read_u32(fwnode, "qcom,decimation", &value);
691 if (!ret) {
692 ret = qcom_vadc_decimation_from_dt(value);
693 if (ret < 0) {
694 dev_err(dev, "%02x invalid decimation %d\n",
695 chan, value);
696 return ret;
697 }
698 prop->decimation = ret;
699 } else {
700 prop->decimation = VADC_DEF_DECIMATION;
701 }
702
703 ret = fwnode_property_read_u32_array(fwnode, "qcom,pre-scaling", varr, 2);
704 if (!ret) {
705 ret = vadc_prescaling_from_dt(varr[0], varr[1]);
706 if (ret < 0) {
707 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
708 chan, varr[0], varr[1]);
709 return ret;
710 }
711 prop->prescale = ret;
712 } else {
713 prop->prescale = vadc_chans[prop->channel].prescale_index;
714 }
715
716 ret = fwnode_property_read_u32(fwnode, "qcom,hw-settle-time", &value);
717 if (!ret) {
718 ret = vadc_hw_settle_time_from_dt(value);
719 if (ret < 0) {
720 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
721 chan, value);
722 return ret;
723 }
724 prop->hw_settle_time = ret;
725 } else {
726 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
727 }
728
729 ret = fwnode_property_read_u32(fwnode, "qcom,avg-samples", &value);
730 if (!ret) {
731 ret = vadc_avg_samples_from_dt(value);
732 if (ret < 0) {
733 dev_err(dev, "%02x invalid avg-samples %d\n",
734 chan, value);
735 return ret;
736 }
737 prop->avg_samples = ret;
738 } else {
739 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
740 }
741
742 if (fwnode_property_read_bool(fwnode, "qcom,ratiometric"))
743 prop->calibration = VADC_CALIB_RATIOMETRIC;
744 else
745 prop->calibration = VADC_CALIB_ABSOLUTE;
746
747 dev_dbg(dev, "%02x name %s\n", chan, name);
748
749 return 0;
750}
751
752static int vadc_get_fw_data(struct vadc_priv *vadc)
753{
754 const struct vadc_channels *vadc_chan;
755 struct iio_chan_spec *iio_chan;
756 struct vadc_channel_prop prop;
757 struct fwnode_handle *child;
758 unsigned int index = 0;
759 int ret;
760
761 vadc->nchannels = device_get_child_node_count(vadc->dev);
762 if (!vadc->nchannels)
763 return -EINVAL;
764
765 vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
766 sizeof(*vadc->iio_chans), GFP_KERNEL);
767 if (!vadc->iio_chans)
768 return -ENOMEM;
769
770 vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
771 sizeof(*vadc->chan_props), GFP_KERNEL);
772 if (!vadc->chan_props)
773 return -ENOMEM;
774
775 iio_chan = vadc->iio_chans;
776
777 device_for_each_child_node(vadc->dev, child) {
778 ret = vadc_get_fw_channel_data(vadc->dev, &prop, child);
779 if (ret) {
780 fwnode_handle_put(child);
781 return ret;
782 }
783
784 prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
785 vadc->chan_props[index] = prop;
786
787 vadc_chan = &vadc_chans[prop.channel];
788
789 iio_chan->channel = prop.channel;
790 iio_chan->datasheet_name = vadc_chan->datasheet_name;
791 iio_chan->info_mask_separate = vadc_chan->info_mask;
792 iio_chan->type = vadc_chan->type;
793 iio_chan->indexed = 1;
794 iio_chan->address = index++;
795
796 iio_chan++;
797 }
798
799 /* These channels are mandatory, they are used as reference points */
800 if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
801 dev_err(vadc->dev, "Please define 1.25V channel\n");
802 return -ENODEV;
803 }
804
805 if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
806 dev_err(vadc->dev, "Please define 0.625V channel\n");
807 return -ENODEV;
808 }
809
810 if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
811 dev_err(vadc->dev, "Please define VDD channel\n");
812 return -ENODEV;
813 }
814
815 if (!vadc_get_channel(vadc, VADC_GND_REF)) {
816 dev_err(vadc->dev, "Please define GND channel\n");
817 return -ENODEV;
818 }
819
820 return 0;
821}
822
823static irqreturn_t vadc_isr(int irq, void *dev_id)
824{
825 struct vadc_priv *vadc = dev_id;
826
827 complete(&vadc->complete);
828
829 return IRQ_HANDLED;
830}
831
832static int vadc_check_revision(struct vadc_priv *vadc)
833{
834 u8 val;
835 int ret;
836
837 ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
838 if (ret)
839 return ret;
840
841 if (val < VADC_PERPH_TYPE_ADC) {
842 dev_err(vadc->dev, "%d is not ADC\n", val);
843 return -ENODEV;
844 }
845
846 ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
847 if (ret)
848 return ret;
849
850 if (val < VADC_PERPH_SUBTYPE_VADC) {
851 dev_err(vadc->dev, "%d is not VADC\n", val);
852 return -ENODEV;
853 }
854
855 ret = vadc_read(vadc, VADC_REVISION2, &val);
856 if (ret)
857 return ret;
858
859 if (val < VADC_REVISION2_SUPPORTED_VADC) {
860 dev_err(vadc->dev, "revision %d not supported\n", val);
861 return -ENODEV;
862 }
863
864 return 0;
865}
866
867static int vadc_probe(struct platform_device *pdev)
868{
869 struct device *dev = &pdev->dev;
870 struct iio_dev *indio_dev;
871 struct vadc_priv *vadc;
872 struct regmap *regmap;
873 int ret, irq_eoc;
874 u32 reg;
875
876 regmap = dev_get_regmap(dev->parent, NULL);
877 if (!regmap)
878 return -ENODEV;
879
880 ret = device_property_read_u32(dev, "reg", ®);
881 if (ret < 0)
882 return ret;
883
884 indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
885 if (!indio_dev)
886 return -ENOMEM;
887
888 vadc = iio_priv(indio_dev);
889 vadc->regmap = regmap;
890 vadc->dev = dev;
891 vadc->base = reg;
892 vadc->are_ref_measured = false;
893 init_completion(&vadc->complete);
894 mutex_init(&vadc->lock);
895
896 ret = vadc_check_revision(vadc);
897 if (ret)
898 return ret;
899
900 ret = vadc_get_fw_data(vadc);
901 if (ret)
902 return ret;
903
904 irq_eoc = platform_get_irq(pdev, 0);
905 if (irq_eoc < 0) {
906 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
907 return irq_eoc;
908 vadc->poll_eoc = true;
909 } else {
910 ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
911 "spmi-vadc", vadc);
912 if (ret)
913 return ret;
914 }
915
916 ret = vadc_reset(vadc);
917 if (ret) {
918 dev_err(dev, "reset failed\n");
919 return ret;
920 }
921
922 ret = vadc_measure_ref_points(vadc);
923 if (ret)
924 return ret;
925
926 indio_dev->name = pdev->name;
927 indio_dev->modes = INDIO_DIRECT_MODE;
928 indio_dev->info = &vadc_info;
929 indio_dev->channels = vadc->iio_chans;
930 indio_dev->num_channels = vadc->nchannels;
931
932 return devm_iio_device_register(dev, indio_dev);
933}
934
935static const struct of_device_id vadc_match_table[] = {
936 { .compatible = "qcom,spmi-vadc" },
937 { }
938};
939MODULE_DEVICE_TABLE(of, vadc_match_table);
940
941static struct platform_driver vadc_driver = {
942 .driver = {
943 .name = "qcom-spmi-vadc",
944 .of_match_table = vadc_match_table,
945 },
946 .probe = vadc_probe,
947};
948module_platform_driver(vadc_driver);
949
950MODULE_ALIAS("platform:qcom-spmi-vadc");
951MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
952MODULE_LICENSE("GPL v2");
953MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
954MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");