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WIP FPC-III support
[linux/fpc-iii.git] / drivers / iio / adc / qcom-spmi-vadc.c
blobb0388f8a69f42e842754ab243570bb6d94dc352e
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 */
88 struct 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 */
112 struct 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
126 static 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
137 static 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
142 static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
143 {
144 return regmap_write(vadc->regmap, vadc->base + offset, data);
145 }
146
147 static 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
169 static 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
174 static 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
208 static 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
249 static 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
274 static 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
287 static 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
301 static 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
343 err_disable:
344 vadc_set_state(vadc, false);
345 if (ret)
346 dev_err(vadc->dev, "conversion failed\n");
347 unlock:
348 mutex_unlock(&vadc->lock);
349 return ret;
350 }
351
352 static 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;
401 err:
402 if (ret)
403 dev_err(vadc->dev, "measure reference points failed\n");
404
405 return ret;
406 }
407
408 static 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
423 static 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
436 static 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
444 static 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
485 static 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
498 static const struct iio_info vadc_info = {
499 .read_raw = vadc_read_raw,
500 .of_xlate = vadc_of_xlate,
501 };
502
503 struct 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 */
548 static 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
651 static 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
735 static 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
806 static 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
815 static 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
850 static 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", &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->name = pdev->name;
911 indio_dev->modes = INDIO_DIRECT_MODE;
912 indio_dev->info = &vadc_info;
913 indio_dev->channels = vadc->iio_chans;
914 indio_dev->num_channels = vadc->nchannels;
915
916 return devm_iio_device_register(dev, indio_dev);
917 }
918
919 static const struct of_device_id vadc_match_table[] = {
920 { .compatible = "qcom,spmi-vadc" },
921 { }
922 };
923 MODULE_DEVICE_TABLE(of, vadc_match_table);
924
925 static struct platform_driver vadc_driver = {
926 .driver = {
927 .name = "qcom-spmi-vadc",
928 .of_match_table = vadc_match_table,
929 },
930 .probe = vadc_probe,
931 };
932 module_platform_driver(vadc_driver);
933
934 MODULE_ALIAS("platform:qcom-spmi-vadc");
935 MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
936 MODULE_LICENSE("GPL v2");
937 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
938 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
Linux with added FPC-III support