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Stanimir Varbanov0917de92015-01-20 12:15:22 +02001/*
Rama Krishna Phani Aba717042016-12-09 20:31:49 +05302 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
Stanimir Varbanov0917de92015-01-20 12:15:22 +02003 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/bitops.h>
15#include <linux/completion.h>
16#include <linux/delay.h>
17#include <linux/err.h>
18#include <linux/iio/iio.h>
19#include <linux/interrupt.h>
20#include <linux/kernel.h>
Ivan T. Ivanov937125a2015-04-17 17:51:08 +030021#include <linux/math64.h>
Stanimir Varbanov0917de92015-01-20 12:15:22 +020022#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/platform_device.h>
25#include <linux/regmap.h>
26#include <linux/slab.h>
27#include <linux/log2.h>
28
29#include <dt-bindings/iio/qcom,spmi-vadc.h>
30
31/* VADC register and bit definitions */
32#define VADC_REVISION2 0x1
33#define VADC_REVISION2_SUPPORTED_VADC 1
34
35#define VADC_PERPH_TYPE 0x4
36#define VADC_PERPH_TYPE_ADC 8
37
38#define VADC_PERPH_SUBTYPE 0x5
39#define VADC_PERPH_SUBTYPE_VADC 1
40
41#define VADC_STATUS1 0x8
42#define VADC_STATUS1_OP_MODE 4
43#define VADC_STATUS1_REQ_STS BIT(1)
44#define VADC_STATUS1_EOC BIT(0)
45#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3
46
47#define VADC_MODE_CTL 0x40
48#define VADC_OP_MODE_SHIFT 3
49#define VADC_OP_MODE_NORMAL 0
50#define VADC_AMUX_TRIM_EN BIT(1)
51#define VADC_ADC_TRIM_EN BIT(0)
52
53#define VADC_EN_CTL1 0x46
54#define VADC_EN_CTL1_SET BIT(7)
55
56#define VADC_ADC_CH_SEL_CTL 0x48
57
58#define VADC_ADC_DIG_PARAM 0x50
59#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
60
61#define VADC_HW_SETTLE_DELAY 0x51
62
63#define VADC_CONV_REQ 0x52
64#define VADC_CONV_REQ_SET BIT(7)
65
66#define VADC_FAST_AVG_CTL 0x5a
67#define VADC_FAST_AVG_EN 0x5b
68#define VADC_FAST_AVG_EN_SET BIT(7)
69
70#define VADC_ACCESS 0xd0
71#define VADC_ACCESS_DATA 0xa5
72
73#define VADC_PERH_RESET_CTL3 0xda
74#define VADC_FOLLOW_WARM_RB BIT(2)
75
76#define VADC_DATA 0x60 /* 16 bits */
77
78#define VADC_CONV_TIME_MIN_US 2000
79#define VADC_CONV_TIME_MAX_US 2100
80
81/* Min ADC code represents 0V */
82#define VADC_MIN_ADC_CODE 0x6000
83/* Max ADC code represents full-scale range of 1.8V */
84#define VADC_MAX_ADC_CODE 0xa800
85
86#define VADC_ABSOLUTE_RANGE_UV 625000
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +053087#define VADC_RATIOMETRIC_RANGE 1800
Stanimir Varbanov0917de92015-01-20 12:15:22 +020088
89#define VADC_DEF_PRESCALING 0 /* 1:1 */
90#define VADC_DEF_DECIMATION 0 /* 512 */
91#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */
92#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */
93#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE
94
95#define VADC_DECIMATION_MIN 512
96#define VADC_DECIMATION_MAX 4096
97
98#define VADC_HW_SETTLE_DELAY_MAX 10000
99#define VADC_AVG_SAMPLES_MAX 512
100
101#define KELVINMIL_CELSIUSMIL 273150
102
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530103#define PMI_CHG_SCALE_1 -138890
104#define PMI_CHG_SCALE_2 391750000000
105
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200106#define VADC_CHAN_MIN VADC_USBIN
107#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
108
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530109/**
110 * struct vadc_map_pt - Map the graph representation for ADC channel
111 * @x: Represent the ADC digitized code.
112 * @y: Represent the physical data which can be temperature, voltage,
113 * resistance.
114 */
115struct vadc_map_pt {
116 s32 x;
117 s32 y;
118};
119
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200120/*
121 * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.
122 * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for
123 * calibration.
124 */
125enum vadc_calibration {
126 VADC_CALIB_ABSOLUTE = 0,
127 VADC_CALIB_RATIOMETRIC
128};
129
130/**
131 * struct vadc_linear_graph - Represent ADC characteristics.
132 * @dy: numerator slope to calculate the gain.
133 * @dx: denominator slope to calculate the gain.
134 * @gnd: A/D word of the ground reference used for the channel.
135 *
136 * Each ADC device has different offset and gain parameters which are
137 * computed to calibrate the device.
138 */
139struct vadc_linear_graph {
140 s32 dy;
141 s32 dx;
142 s32 gnd;
143};
144
145/**
146 * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.
147 * @num: the inverse numerator of the gain applied to the input channel.
148 * @den: the inverse denominator of the gain applied to the input channel.
149 */
150struct vadc_prescale_ratio {
151 u32 num;
152 u32 den;
153};
154
155/**
156 * struct vadc_channel_prop - VADC channel property.
157 * @channel: channel number, refer to the channel list.
158 * @calibration: calibration type.
159 * @decimation: sampling rate supported for the channel.
160 * @prescale: channel scaling performed on the input signal.
161 * @hw_settle_time: the time between AMUX being configured and the
162 * start of conversion.
163 * @avg_samples: ability to provide single result from the ADC
164 * that is an average of multiple measurements.
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530165 * @scale_fn: Represents the scaling function to convert voltage
166 * physical units desired by the client for the channel.
167 * Referenced from enum vadc_scale_fn_type.
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200168 */
169struct vadc_channel_prop {
170 unsigned int channel;
171 enum vadc_calibration calibration;
172 unsigned int decimation;
173 unsigned int prescale;
174 unsigned int hw_settle_time;
175 unsigned int avg_samples;
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530176 unsigned int scale_fn;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200177};
178
179/**
180 * struct vadc_priv - VADC private structure.
181 * @regmap: pointer to struct regmap.
182 * @dev: pointer to struct device.
183 * @base: base address for the ADC peripheral.
184 * @nchannels: number of VADC channels.
185 * @chan_props: array of VADC channel properties.
186 * @iio_chans: array of IIO channels specification.
187 * @are_ref_measured: are reference points measured.
188 * @poll_eoc: use polling instead of interrupt.
189 * @complete: VADC result notification after interrupt is received.
190 * @graph: store parameters for calibration.
191 * @lock: ADC lock for access to the peripheral.
192 */
193struct vadc_priv {
194 struct regmap *regmap;
195 struct device *dev;
196 u16 base;
197 unsigned int nchannels;
198 struct vadc_channel_prop *chan_props;
199 struct iio_chan_spec *iio_chans;
200 bool are_ref_measured;
201 bool poll_eoc;
202 struct completion complete;
203 struct vadc_linear_graph graph[2];
204 struct mutex lock;
205};
206
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530207/**
208 * struct vadc_scale_fn - Scaling function prototype
209 * @scale: Function pointer to one of the scaling functions
210 * which takes the adc properties, channel properties,
211 * and returns the physical result.
212 */
213struct vadc_scale_fn {
214 int (*scale)(struct vadc_priv *, const struct vadc_channel_prop *,
215 u16, int *);
216};
217
218/**
219 * enum vadc_scale_fn_type - Scaling function to convert ADC code to
220 * physical scaled units for the channel.
221 * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).
222 * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.
223 * Uses a mapping table with 100K pullup.
224 * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
225 * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
226 * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
227 */
228enum vadc_scale_fn_type {
229 SCALE_DEFAULT = 0,
230 SCALE_THERM_100K_PULLUP,
231 SCALE_PMIC_THERM,
232 SCALE_XOTHERM,
233 SCALE_PMI_CHG_TEMP,
234};
235
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200236static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
237 {.num = 1, .den = 1},
238 {.num = 1, .den = 3},
239 {.num = 1, .den = 4},
240 {.num = 1, .den = 6},
241 {.num = 1, .den = 20},
242 {.num = 1, .den = 8},
243 {.num = 10, .den = 81},
244 {.num = 1, .den = 10}
245};
246
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530247/* Voltage to temperature */
248static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
249 {1758, -40},
250 {1742, -35},
251 {1719, -30},
252 {1691, -25},
253 {1654, -20},
254 {1608, -15},
255 {1551, -10},
256 {1483, -5},
257 {1404, 0},
258 {1315, 5},
259 {1218, 10},
260 {1114, 15},
261 {1007, 20},
262 {900, 25},
263 {795, 30},
264 {696, 35},
265 {605, 40},
266 {522, 45},
267 {448, 50},
268 {383, 55},
269 {327, 60},
270 {278, 65},
271 {237, 70},
272 {202, 75},
273 {172, 80},
274 {146, 85},
275 {125, 90},
276 {107, 95},
277 {92, 100},
278 {79, 105},
279 {68, 110},
280 {59, 115},
281 {51, 120},
282 {44, 125}
283};
284
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200285static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
286{
287 return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
288}
289
290static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
291{
292 return regmap_write(vadc->regmap, vadc->base + offset, data);
293}
294
295static int vadc_reset(struct vadc_priv *vadc)
296{
297 u8 data;
298 int ret;
299
300 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
301 if (ret)
302 return ret;
303
304 ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
305 if (ret)
306 return ret;
307
308 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
309 if (ret)
310 return ret;
311
312 data |= VADC_FOLLOW_WARM_RB;
313
314 return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
315}
316
317static int vadc_set_state(struct vadc_priv *vadc, bool state)
318{
319 return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
320}
321
322static void vadc_show_status(struct vadc_priv *vadc)
323{
324 u8 mode, sta1, chan, dig, en, req;
325 int ret;
326
327 ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
328 if (ret)
329 return;
330
331 ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
332 if (ret)
333 return;
334
335 ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
336 if (ret)
337 return;
338
339 ret = vadc_read(vadc, VADC_CONV_REQ, &req);
340 if (ret)
341 return;
342
343 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
344 if (ret)
345 return;
346
347 ret = vadc_read(vadc, VADC_EN_CTL1, &en);
348 if (ret)
349 return;
350
351 dev_err(vadc->dev,
352 "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
353 mode, en, chan, dig, req, sta1);
354}
355
356static int vadc_configure(struct vadc_priv *vadc,
357 struct vadc_channel_prop *prop)
358{
359 u8 decimation, mode_ctrl;
360 int ret;
361
362 /* Mode selection */
363 mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
364 VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
365 ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
366 if (ret)
367 return ret;
368
369 /* Channel selection */
370 ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
371 if (ret)
372 return ret;
373
374 /* Digital parameter setup */
375 decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
376 ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
377 if (ret)
378 return ret;
379
380 /* HW settle time delay */
381 ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
382 if (ret)
383 return ret;
384
385 ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
386 if (ret)
387 return ret;
388
389 if (prop->avg_samples)
390 ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
391 else
392 ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
393
394 return ret;
395}
396
397static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
398{
399 unsigned int count, retry;
400 u8 sta1;
401 int ret;
402
403 retry = interval_us / VADC_CONV_TIME_MIN_US;
404
405 for (count = 0; count < retry; count++) {
406 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
407 if (ret)
408 return ret;
409
410 sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
411 if (sta1 == VADC_STATUS1_EOC)
412 return 0;
413
414 usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
415 }
416
417 vadc_show_status(vadc);
418
419 return -ETIMEDOUT;
420}
421
422static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
423{
424 int ret;
425
426 ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
427 if (ret)
428 return ret;
429
430 *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
431
432 return 0;
433}
434
435static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
436 unsigned int num)
437{
438 unsigned int i;
439
440 for (i = 0; i < vadc->nchannels; i++)
441 if (vadc->chan_props[i].channel == num)
442 return &vadc->chan_props[i];
443
444 dev_dbg(vadc->dev, "no such channel %02x\n", num);
445
446 return NULL;
447}
448
449static int vadc_do_conversion(struct vadc_priv *vadc,
450 struct vadc_channel_prop *prop, u16 *data)
451{
452 unsigned int timeout;
453 int ret;
454
455 mutex_lock(&vadc->lock);
456
457 ret = vadc_configure(vadc, prop);
458 if (ret)
459 goto unlock;
460
461 if (!vadc->poll_eoc)
462 reinit_completion(&vadc->complete);
463
464 ret = vadc_set_state(vadc, true);
465 if (ret)
466 goto unlock;
467
468 ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
469 if (ret)
470 goto err_disable;
471
472 timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
473
474 if (vadc->poll_eoc) {
475 ret = vadc_poll_wait_eoc(vadc, timeout);
476 } else {
477 ret = wait_for_completion_timeout(&vadc->complete, timeout);
478 if (!ret) {
479 ret = -ETIMEDOUT;
480 goto err_disable;
481 }
482
483 /* Double check conversion status */
484 ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
485 if (ret)
486 goto err_disable;
487 }
488
489 ret = vadc_read_result(vadc, data);
490
491err_disable:
492 vadc_set_state(vadc, false);
493 if (ret)
494 dev_err(vadc->dev, "conversion failed\n");
495unlock:
496 mutex_unlock(&vadc->lock);
497 return ret;
498}
499
500static int vadc_measure_ref_points(struct vadc_priv *vadc)
501{
502 struct vadc_channel_prop *prop;
503 u16 read_1, read_2;
504 int ret;
505
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530506 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200507 vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
508
509 prop = vadc_get_channel(vadc, VADC_REF_1250MV);
510 ret = vadc_do_conversion(vadc, prop, &read_1);
511 if (ret)
512 goto err;
513
514 /* Try with buffered 625mV channel first */
515 prop = vadc_get_channel(vadc, VADC_SPARE1);
516 if (!prop)
517 prop = vadc_get_channel(vadc, VADC_REF_625MV);
518
519 ret = vadc_do_conversion(vadc, prop, &read_2);
520 if (ret)
521 goto err;
522
523 if (read_1 == read_2) {
524 ret = -EINVAL;
525 goto err;
526 }
527
528 vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
529 vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
530
531 /* Ratiometric calibration */
532 prop = vadc_get_channel(vadc, VADC_VDD_VADC);
533 ret = vadc_do_conversion(vadc, prop, &read_1);
534 if (ret)
535 goto err;
536
537 prop = vadc_get_channel(vadc, VADC_GND_REF);
538 ret = vadc_do_conversion(vadc, prop, &read_2);
539 if (ret)
540 goto err;
541
542 if (read_1 == read_2) {
543 ret = -EINVAL;
544 goto err;
545 }
546
547 vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
548 vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
549err:
550 if (ret)
551 dev_err(vadc->dev, "measure reference points failed\n");
552
553 return ret;
554}
555
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530556static int vadc_map_voltage_temp(const struct vadc_map_pt *pts,
557 u32 tablesize, s32 input, s64 *output)
558{
559 bool descending = 1;
560 u32 i = 0;
561
562 if (!pts)
563 return -EINVAL;
564
565 /* Check if table is descending or ascending */
566 if (tablesize > 1) {
567 if (pts[0].x < pts[1].x)
568 descending = 0;
569 }
570
571 while (i < tablesize) {
572 if ((descending) && (pts[i].x < input)) {
573 /* table entry is less than measured*/
574 /* value and table is descending, stop */
575 break;
576 } else if ((!descending) &&
577 (pts[i].x > input)) {
578 /* table entry is greater than measured*/
579 /*value and table is ascending, stop */
580 break;
581 }
582 i++;
583 }
584
585 if (i == 0) {
586 *output = pts[0].y;
587 } else if (i == tablesize) {
588 *output = pts[tablesize - 1].y;
589 } else {
590 /* result is between search_index and search_index-1 */
591 /* interpolate linearly */
592 *output = (((s32)((pts[i].y - pts[i - 1].y) *
593 (input - pts[i - 1].x)) /
594 (pts[i].x - pts[i - 1].x)) +
595 pts[i - 1].y);
596 }
597
598 return 0;
599}
600
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530601static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code,
602 const struct vadc_channel_prop *prop,
603 s64 *scale_voltage)
604{
605 *scale_voltage = (adc_code -
606 vadc->graph[prop->calibration].gnd);
607 *scale_voltage *= vadc->graph[prop->calibration].dx;
608 *scale_voltage = div64_s64(*scale_voltage,
609 vadc->graph[prop->calibration].dy);
610 if (prop->calibration == VADC_CALIB_ABSOLUTE)
611 *scale_voltage +=
612 vadc->graph[prop->calibration].dx;
613
614 if (*scale_voltage < 0)
615 *scale_voltage = 0;
616}
617
618static int vadc_scale_volt(struct vadc_priv *vadc,
619 const struct vadc_channel_prop *prop, u16 adc_code,
620 int *result_uv)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200621{
622 const struct vadc_prescale_ratio *prescale;
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530623 s64 voltage = 0, result = 0;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200624
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530625 vadc_scale_calib(vadc, adc_code, prop, &voltage);
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200626
627 prescale = &vadc_prescale_ratios[prop->prescale];
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200628 voltage = voltage * prescale->den;
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530629 result = div64_s64(voltage, prescale->num);
630 *result_uv = result;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200631
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530632 return 0;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200633}
634
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530635static int vadc_scale_therm(struct vadc_priv *vadc,
636 const struct vadc_channel_prop *prop, u16 adc_code,
637 int *result_mdec)
638{
639 s64 voltage = 0, result = 0;
640
641 vadc_scale_calib(vadc, adc_code, prop, &voltage);
642
643 if (prop->calibration == VADC_CALIB_ABSOLUTE)
644 voltage /= 1000;
645
646 vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
647 ARRAY_SIZE(adcmap_100k_104ef_104fb),
648 voltage, &result);
649 result *= 1000;
650 *result_mdec = result;
651
652 return 0;
653}
654
655static int vadc_scale_die_temp(struct vadc_priv *vadc,
656 const struct vadc_channel_prop *prop,
657 u16 adc_code, int *result_mdec)
658{
659 const struct vadc_prescale_ratio *prescale;
660 s64 voltage = 0;
661
662 vadc_scale_calib(vadc, adc_code, prop, &voltage);
663
664 if (voltage > 0) {
665 prescale = &vadc_prescale_ratios[prop->prescale];
666 voltage = voltage * prescale->den;
667 voltage /= (prescale->num * 2);
668 } else {
669 voltage = 0;
670 }
671
672 voltage -= KELVINMIL_CELSIUSMIL;
673 *result_mdec = voltage;
674
675 return 0;
676}
677
678static int vadc_scale_chg_temp(struct vadc_priv *vadc,
679 const struct vadc_channel_prop *prop,
680 u16 adc_code, int *result_mdec)
681{
682 const struct vadc_prescale_ratio *prescale;
683 s64 voltage = 0, result = 0;
684
685 vadc_scale_calib(vadc, adc_code, prop, &voltage);
686
687 prescale = &vadc_prescale_ratios[prop->prescale];
688 voltage = voltage * prescale->den;
689 voltage = div64_s64(voltage, prescale->num);
690 voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
691 voltage = (voltage + PMI_CHG_SCALE_2);
692 result = div64_s64(voltage, 1000000);
693 *result_mdec = result;
694
695 return 0;
696}
697
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200698static int vadc_decimation_from_dt(u32 value)
699{
700 if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
701 value > VADC_DECIMATION_MAX)
702 return -EINVAL;
703
704 return __ffs64(value / VADC_DECIMATION_MIN);
705}
706
707static int vadc_prescaling_from_dt(u32 num, u32 den)
708{
709 unsigned int pre;
710
711 for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
712 if (vadc_prescale_ratios[pre].num == num &&
713 vadc_prescale_ratios[pre].den == den)
714 break;
715
716 if (pre == ARRAY_SIZE(vadc_prescale_ratios))
717 return -EINVAL;
718
719 return pre;
720}
721
722static int vadc_hw_settle_time_from_dt(u32 value)
723{
724 if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
725 return -EINVAL;
726
727 if (value <= 1000)
728 value /= 100;
729 else
730 value = value / 2000 + 10;
731
732 return value;
733}
734
735static int vadc_avg_samples_from_dt(u32 value)
736{
737 if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
738 return -EINVAL;
739
740 return __ffs64(value);
741}
742
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530743static struct vadc_scale_fn scale_fn[] = {
744 [SCALE_DEFAULT] = {vadc_scale_volt},
745 [SCALE_THERM_100K_PULLUP] = {vadc_scale_therm},
746 [SCALE_PMIC_THERM] = {vadc_scale_die_temp},
747 [SCALE_XOTHERM] = {vadc_scale_therm},
748 [SCALE_PMI_CHG_TEMP] = {vadc_scale_chg_temp},
749};
750
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200751static int vadc_read_raw(struct iio_dev *indio_dev,
752 struct iio_chan_spec const *chan, int *val, int *val2,
753 long mask)
754{
755 struct vadc_priv *vadc = iio_priv(indio_dev);
756 struct vadc_channel_prop *prop;
757 u16 adc_code;
758 int ret;
759
760 switch (mask) {
761 case IIO_CHAN_INFO_PROCESSED:
762 prop = &vadc->chan_props[chan->address];
763 ret = vadc_do_conversion(vadc, prop, &adc_code);
764 if (ret)
765 break;
766
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530767 scale_fn[prop->scale_fn].scale(vadc, prop, adc_code, val);
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200768
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200769 return IIO_VAL_INT;
770 case IIO_CHAN_INFO_RAW:
771 prop = &vadc->chan_props[chan->address];
772 ret = vadc_do_conversion(vadc, prop, &adc_code);
773 if (ret)
774 break;
775
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530776 *val = (int)adc_code;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200777 return IIO_VAL_INT;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200778 default:
779 ret = -EINVAL;
780 break;
781 }
782
783 return ret;
784}
785
786static int vadc_of_xlate(struct iio_dev *indio_dev,
787 const struct of_phandle_args *iiospec)
788{
789 struct vadc_priv *vadc = iio_priv(indio_dev);
790 unsigned int i;
791
792 for (i = 0; i < vadc->nchannels; i++)
793 if (vadc->iio_chans[i].channel == iiospec->args[0])
794 return i;
795
796 return -EINVAL;
797}
798
799static const struct iio_info vadc_info = {
800 .read_raw = vadc_read_raw,
801 .of_xlate = vadc_of_xlate,
802 .driver_module = THIS_MODULE,
803};
804
805struct vadc_channels {
806 const char *datasheet_name;
807 unsigned int prescale_index;
808 enum iio_chan_type type;
809 long info_mask;
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530810 unsigned int scale_fn;
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200811};
812
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530813#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
814 [VADC_##_dname] = { \
815 .datasheet_name = __stringify(_dname), \
816 .prescale_index = _pre, \
817 .type = _type, \
818 .info_mask = _mask, \
819 .scale_fn = _scale \
820 }, \
821
822#define VADC_NO_CHAN(_dname, _type, _mask, _pre) \
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200823 [VADC_##_dname] = { \
824 .datasheet_name = __stringify(_dname), \
825 .prescale_index = _pre, \
826 .type = _type, \
827 .info_mask = _mask \
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530828 },
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200829
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530830#define VADC_CHAN_TEMP(_dname, _pre, _scale) \
831 VADC_CHAN(_dname, IIO_TEMP, \
832 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \
833 _pre, _scale) \
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200834
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530835#define VADC_CHAN_VOLT(_dname, _pre, _scale) \
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200836 VADC_CHAN(_dname, IIO_VOLTAGE, \
Rama Krishna Phani Aba717042016-12-09 20:31:49 +0530837 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530838 _pre, _scale) \
839
840#define VADC_CHAN_NO_SCALE(_dname, _pre) \
841 VADC_NO_CHAN(_dname, IIO_VOLTAGE, \
842 BIT(IIO_CHAN_INFO_RAW), \
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200843 _pre) \
844
845/*
846 * The array represents all possible ADC channels found in the supported PMICs.
847 * Every index in the array is equal to the channel number per datasheet. The
848 * gaps in the array should be treated as reserved channels.
849 */
850static const struct vadc_channels vadc_chans[] = {
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530851 VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
852 VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
853 VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
854 VADC_CHAN_NO_SCALE(SPARE1_03, 1)
855 VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
856 VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
857 VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
858 VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
859 VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
860 VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
861 VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
862 VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
863 VADC_CHAN_NO_SCALE(SPARE1, 0)
864 VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
865 VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
866 VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200867
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530868 VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
869 VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
870 VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
871 VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
872 VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
873 VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
874 VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
875 VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
876 VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
877 VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
878 VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
879 VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
880 VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
881 VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
882 VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
883 VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200884
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530885 VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
886 VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
887 VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
888 VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
889 VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
890 VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
891 VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
892 VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
893 VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
894 VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
895 VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
896 VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
897 VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
898 VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
899 VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
900 VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200901
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530902 VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
903 VADC_CHAN_NO_SCALE(LR_MUX2_BAT_ID, 0)
904 VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
905 VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
906 VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
907 VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
908 VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
909 VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
910 VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
911 VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
912 VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
913 VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
914 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200915
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530916 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
917 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
918 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
919 VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
920 VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
921 VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
922 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
923 VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
924 VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
925 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
926 VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200927
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530928 VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
929 VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
930 VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
931 VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
932 VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
933 VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
934 VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
935 VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
936 VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
937 VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
938 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200939
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +0530940 VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
941 VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
942 VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
943 VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
944 VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
945 VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
946 VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
947 VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
948 VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
949 VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
950 VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
Stanimir Varbanov0917de92015-01-20 12:15:22 +0200951};
952
953static int vadc_get_dt_channel_data(struct device *dev,
954 struct vadc_channel_prop *prop,
955 struct device_node *node)
956{
957 const char *name = node->name;
958 u32 chan, value, varr[2];
959 int ret;
960
961 ret = of_property_read_u32(node, "reg", &chan);
962 if (ret) {
963 dev_err(dev, "invalid channel number %s\n", name);
964 return ret;
965 }
966
967 if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
968 dev_err(dev, "%s invalid channel number %d\n", name, chan);
969 return -EINVAL;
970 }
971
972 /* the channel has DT description */
973 prop->channel = chan;
974
975 ret = of_property_read_u32(node, "qcom,decimation", &value);
976 if (!ret) {
977 ret = vadc_decimation_from_dt(value);
978 if (ret < 0) {
979 dev_err(dev, "%02x invalid decimation %d\n",
980 chan, value);
981 return ret;
982 }
983 prop->decimation = ret;
984 } else {
985 prop->decimation = VADC_DEF_DECIMATION;
986 }
987
988 ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
989 if (!ret) {
990 ret = vadc_prescaling_from_dt(varr[0], varr[1]);
991 if (ret < 0) {
992 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
993 chan, varr[0], varr[1]);
994 return ret;
995 }
996 prop->prescale = ret;
997 } else {
998 prop->prescale = vadc_chans[prop->channel].prescale_index;
999 }
1000
1001 ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
1002 if (!ret) {
1003 ret = vadc_hw_settle_time_from_dt(value);
1004 if (ret < 0) {
1005 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
1006 chan, value);
1007 return ret;
1008 }
1009 prop->hw_settle_time = ret;
1010 } else {
1011 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
1012 }
1013
1014 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
1015 if (!ret) {
1016 ret = vadc_avg_samples_from_dt(value);
1017 if (ret < 0) {
1018 dev_err(dev, "%02x invalid avg-samples %d\n",
1019 chan, value);
1020 return ret;
1021 }
1022 prop->avg_samples = ret;
1023 } else {
1024 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
1025 }
1026
1027 if (of_property_read_bool(node, "qcom,ratiometric"))
1028 prop->calibration = VADC_CALIB_RATIOMETRIC;
1029 else
1030 prop->calibration = VADC_CALIB_ABSOLUTE;
1031
1032 dev_dbg(dev, "%02x name %s\n", chan, name);
1033
1034 return 0;
1035}
1036
1037static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
1038{
1039 const struct vadc_channels *vadc_chan;
1040 struct iio_chan_spec *iio_chan;
1041 struct vadc_channel_prop prop;
1042 struct device_node *child;
1043 unsigned int index = 0;
1044 int ret;
1045
1046 vadc->nchannels = of_get_available_child_count(node);
1047 if (!vadc->nchannels)
1048 return -EINVAL;
1049
1050 vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
1051 sizeof(*vadc->iio_chans), GFP_KERNEL);
1052 if (!vadc->iio_chans)
1053 return -ENOMEM;
1054
1055 vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
1056 sizeof(*vadc->chan_props), GFP_KERNEL);
1057 if (!vadc->chan_props)
1058 return -ENOMEM;
1059
1060 iio_chan = vadc->iio_chans;
1061
1062 for_each_available_child_of_node(node, child) {
1063 ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
Julia Lawalld4c65fe2015-11-18 23:04:13 +01001064 if (ret) {
1065 of_node_put(child);
Stanimir Varbanov0917de92015-01-20 12:15:22 +02001066 return ret;
Julia Lawalld4c65fe2015-11-18 23:04:13 +01001067 }
Stanimir Varbanov0917de92015-01-20 12:15:22 +02001068
Rama Krishna Phani A7c271ee2016-12-09 20:31:50 +05301069 prop.scale_fn = vadc_chans[prop.channel].scale_fn;
Stanimir Varbanov0917de92015-01-20 12:15:22 +02001070 vadc->chan_props[index] = prop;
1071
1072 vadc_chan = &vadc_chans[prop.channel];
1073
1074 iio_chan->channel = prop.channel;
1075 iio_chan->datasheet_name = vadc_chan->datasheet_name;
1076 iio_chan->info_mask_separate = vadc_chan->info_mask;
1077 iio_chan->type = vadc_chan->type;
1078 iio_chan->indexed = 1;
1079 iio_chan->address = index++;
1080
1081 iio_chan++;
1082 }
1083
1084 /* These channels are mandatory, they are used as reference points */
1085 if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
1086 dev_err(vadc->dev, "Please define 1.25V channel\n");
1087 return -ENODEV;
1088 }
1089
1090 if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
1091 dev_err(vadc->dev, "Please define 0.625V channel\n");
1092 return -ENODEV;
1093 }
1094
1095 if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
1096 dev_err(vadc->dev, "Please define VDD channel\n");
1097 return -ENODEV;
1098 }
1099
1100 if (!vadc_get_channel(vadc, VADC_GND_REF)) {
1101 dev_err(vadc->dev, "Please define GND channel\n");
1102 return -ENODEV;
1103 }
1104
1105 return 0;
1106}
1107
1108static irqreturn_t vadc_isr(int irq, void *dev_id)
1109{
1110 struct vadc_priv *vadc = dev_id;
1111
1112 complete(&vadc->complete);
1113
1114 return IRQ_HANDLED;
1115}
1116
1117static int vadc_check_revision(struct vadc_priv *vadc)
1118{
1119 u8 val;
1120 int ret;
1121
1122 ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
1123 if (ret)
1124 return ret;
1125
1126 if (val < VADC_PERPH_TYPE_ADC) {
1127 dev_err(vadc->dev, "%d is not ADC\n", val);
1128 return -ENODEV;
1129 }
1130
1131 ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
1132 if (ret)
1133 return ret;
1134
1135 if (val < VADC_PERPH_SUBTYPE_VADC) {
1136 dev_err(vadc->dev, "%d is not VADC\n", val);
1137 return -ENODEV;
1138 }
1139
1140 ret = vadc_read(vadc, VADC_REVISION2, &val);
1141 if (ret)
1142 return ret;
1143
1144 if (val < VADC_REVISION2_SUPPORTED_VADC) {
1145 dev_err(vadc->dev, "revision %d not supported\n", val);
1146 return -ENODEV;
1147 }
1148
1149 return 0;
1150}
1151
1152static int vadc_probe(struct platform_device *pdev)
1153{
1154 struct device_node *node = pdev->dev.of_node;
1155 struct device *dev = &pdev->dev;
1156 struct iio_dev *indio_dev;
1157 struct vadc_priv *vadc;
1158 struct regmap *regmap;
1159 int ret, irq_eoc;
1160 u32 reg;
1161
1162 regmap = dev_get_regmap(dev->parent, NULL);
1163 if (!regmap)
1164 return -ENODEV;
1165
1166 ret = of_property_read_u32(node, "reg", &reg);
1167 if (ret < 0)
1168 return ret;
1169
1170 indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
1171 if (!indio_dev)
1172 return -ENOMEM;
1173
1174 vadc = iio_priv(indio_dev);
1175 vadc->regmap = regmap;
1176 vadc->dev = dev;
1177 vadc->base = reg;
1178 vadc->are_ref_measured = false;
1179 init_completion(&vadc->complete);
1180 mutex_init(&vadc->lock);
1181
1182 ret = vadc_check_revision(vadc);
1183 if (ret)
1184 return ret;
1185
1186 ret = vadc_get_dt_data(vadc, node);
1187 if (ret)
1188 return ret;
1189
1190 irq_eoc = platform_get_irq(pdev, 0);
1191 if (irq_eoc < 0) {
1192 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
1193 return irq_eoc;
1194 vadc->poll_eoc = true;
1195 } else {
1196 ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
1197 "spmi-vadc", vadc);
1198 if (ret)
1199 return ret;
1200 }
1201
1202 ret = vadc_reset(vadc);
1203 if (ret) {
1204 dev_err(dev, "reset failed\n");
1205 return ret;
1206 }
1207
1208 ret = vadc_measure_ref_points(vadc);
1209 if (ret)
1210 return ret;
1211
1212 indio_dev->dev.parent = dev;
1213 indio_dev->dev.of_node = node;
1214 indio_dev->name = pdev->name;
1215 indio_dev->modes = INDIO_DIRECT_MODE;
1216 indio_dev->info = &vadc_info;
1217 indio_dev->channels = vadc->iio_chans;
1218 indio_dev->num_channels = vadc->nchannels;
1219
1220 return devm_iio_device_register(dev, indio_dev);
1221}
1222
1223static const struct of_device_id vadc_match_table[] = {
1224 { .compatible = "qcom,spmi-vadc" },
1225 { }
1226};
1227MODULE_DEVICE_TABLE(of, vadc_match_table);
1228
1229static struct platform_driver vadc_driver = {
1230 .driver = {
1231 .name = "qcom-spmi-vadc",
1232 .of_match_table = vadc_match_table,
1233 },
1234 .probe = vadc_probe,
1235};
1236module_platform_driver(vadc_driver);
1237
1238MODULE_ALIAS("platform:qcom-spmi-vadc");
1239MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
1240MODULE_LICENSE("GPL v2");
1241MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
1242MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");