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