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Merge tag 'nfsd-6.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
[linux-block.git] / drivers / iio / adc / qcom-spmi-vadc.c
CommitLineData
97fb5e8d 1// SPDX-License-Identifier: GPL-2.0-only
0917de94 2/*
ba71704a 3 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
0917de94
SV		 4 */
5
6#include <linux/bitops.h>
7#include <linux/completion.h>
8#include <linux/delay.h>
9#include <linux/err.h>
ec82edb2 10#include <linux/iio/adc/qcom-vadc-common.h>
0917de94
SV		 11#include <linux/iio/iio.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
937125ac 14#include <linux/math64.h>
0917de94 15#include <linux/module.h>
e7c672d0 16#include <linux/mod_devicetable.h>
0917de94 17#include <linux/platform_device.h>
e7c672d0 18#include <linux/property.h>
0917de94
SV		 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
0917de94
SV		 72#define VADC_CHAN_MIN VADC_USBIN
73#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
74
0917de94
SV		 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.
e932d4f0 85 * @scale_fn_type: Represents the scaling function to convert voltage
7c271eea 86 * physical units desired by the client for the channel.
0917de94
SV		 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;
e932d4f0 95 enum vadc_scale_fn_type scale_fn_type;
0917de94
SV		 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
a5e9b2dd
AS		 126static const struct u32_fract vadc_prescale_ratios[] = {
127 { .numerator = 1, .denominator = 1 },
128 { .numerator = 1, .denominator = 3 },
129 { .numerator = 1, .denominator = 4 },
130 { .numerator = 1, .denominator = 6 },
131 { .numerator = 1, .denominator = 20 },
132 { .numerator = 1, .denominator = 8 },
133 { .numerator = 10, .denominator = 81 },
134 { .numerator = 1, .denominator = 10 },
0917de94
SV		 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
7c271eea 358 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
0917de94
SV		 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
a5e9b2dd 408static int vadc_prescaling_from_dt(u32 numerator, u32 denominator)
0917de94
SV		 409{
410 unsigned int pre;
411
412 for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
a5e9b2dd
AS		 413 if (vadc_prescale_ratios[pre].numerator == numerator &&
414 vadc_prescale_ratios[pre].denominator == denominator)
0917de94
SV		 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
e932d4f0
LW		 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;
0917de94 467
0917de94
SV		 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
ba71704a 475 *val = (int)adc_code;
0917de94 476 return IIO_VAL_INT;
0917de94
SV		 477 default:
478 ret = -EINVAL;
479 break;
480 }
481
482 return ret;
483}
484
e7c672d0
NS		 485static int vadc_fwnode_xlate(struct iio_dev *indio_dev,
486 const struct fwnode_reference_args *iiospec)
0917de94
SV		 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,
e7c672d0 500 .fwnode_xlate = vadc_fwnode_xlate,
0917de94
SV		 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;
e932d4f0 508 enum vadc_scale_fn_type scale_fn_type;
0917de94
SV		 509};
510
7c271eea 511#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
0917de94
SV		 512 [VADC_##_dname] = { \
513 .datasheet_name = __stringify(_dname), \
514 .prescale_index = _pre, \
515 .type = _type, \
7c271eea 516 .info_mask = _mask, \
e932d4f0 517 .scale_fn_type = _scale \
0917de94
SV		 518 }, \
519
7c271eea
RKP		 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 },
0917de94 527
7c271eea
RKP		 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) \
0917de94 534 VADC_CHAN(_dname, IIO_VOLTAGE, \
ba71704a 535 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
7c271eea
RKP		 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), \
0917de94
SV		 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[] = {
7c271eea
RKP		 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)
7d200b28 601 VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT)
7c271eea
RKP		 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)
0917de94
SV		 649};
650
e7c672d0 651static int vadc_get_fw_channel_data(struct device *dev,
0917de94 652 struct vadc_channel_prop *prop,
e7c672d0 653 struct fwnode_handle *fwnode)
0917de94 654{
e7c672d0 655 const char *name = fwnode_get_name(fwnode);
0917de94
SV		 656 u32 chan, value, varr[2];
657 int ret;
658
e7c672d0 659 ret = fwnode_property_read_u32(fwnode, "reg", &chan);
0917de94
SV		 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
e7c672d0 673 ret = fwnode_property_read_u32(fwnode, "qcom,decimation", &value);
0917de94 674 if (!ret) {
e932d4f0 675 ret = qcom_vadc_decimation_from_dt(value);
0917de94
SV		 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
e7c672d0 686 ret = fwnode_property_read_u32_array(fwnode, "qcom,pre-scaling", varr, 2);
0917de94
SV		 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
e7c672d0 699 ret = fwnode_property_read_u32(fwnode, "qcom,hw-settle-time", &value);
0917de94
SV		 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
e7c672d0 712 ret = fwnode_property_read_u32(fwnode, "qcom,avg-samples", &value);
0917de94
SV		 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
e7c672d0 725 if (fwnode_property_read_bool(fwnode, "qcom,ratiometric"))
0917de94
SV		 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
e7c672d0 735static int vadc_get_fw_data(struct vadc_priv *vadc)
0917de94
SV		 736{
737 const struct vadc_channels *vadc_chan;
738 struct iio_chan_spec *iio_chan;
739 struct vadc_channel_prop prop;
e7c672d0 740 struct fwnode_handle *child;
0917de94
SV		 741 unsigned int index = 0;
742 int ret;
743
e7c672d0 744 vadc->nchannels = device_get_child_node_count(vadc->dev);
0917de94
SV		 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
e7c672d0
NS		 760 device_for_each_child_node(vadc->dev, child) {
761 ret = vadc_get_fw_channel_data(vadc->dev, &prop, child);
d4c65fe4 762 if (ret) {
e7c672d0 763 fwnode_handle_put(child);
0917de94 764 return ret;
d4c65fe4 765 }
0917de94 766
e932d4f0 767 prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
0917de94
SV		 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{
0917de94
SV		 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
e7c672d0 863 ret = device_property_read_u32(dev, "reg", &reg);
0917de94
SV		 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
e7c672d0 883 ret = vadc_get_fw_data(vadc);
0917de94
SV		 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
0917de94
SV		 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>");
Linux 6.x block layer and io_uring tree(s)