xref: /linux/drivers/iio/adc/qcom-spmi-vadc.c (revision 0be3ff0c) 
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/of.h>
17 #include <linux/platform_device.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  */
87 struct vadc_channel_prop {
88 	unsigned int channel;
89 	enum vadc_calibration calibration;
90 	unsigned int decimation;
91 	unsigned int prescale;
92 	unsigned int hw_settle_time;
93 	unsigned int avg_samples;
94 	enum vadc_scale_fn_type scale_fn_type;
95 };
96 
97 /**
98  * struct vadc_priv - VADC private structure.
99  * @regmap: pointer to struct regmap.
100  * @dev: pointer to struct device.
101  * @base: base address for the ADC peripheral.
102  * @nchannels: number of VADC channels.
103  * @chan_props: array of VADC channel properties.
104  * @iio_chans: array of IIO channels specification.
105  * @are_ref_measured: are reference points measured.
106  * @poll_eoc: use polling instead of interrupt.
107  * @complete: VADC result notification after interrupt is received.
108  * @graph: store parameters for calibration.
109  * @lock: ADC lock for access to the peripheral.
110  */
111 struct vadc_priv {
112 	struct regmap		 *regmap;
113 	struct device		 *dev;
114 	u16			 base;
115 	unsigned int		 nchannels;
116 	struct vadc_channel_prop *chan_props;
117 	struct iio_chan_spec	 *iio_chans;
118 	bool			 are_ref_measured;
119 	bool			 poll_eoc;
120 	struct completion	 complete;
121 	struct vadc_linear_graph graph[2];
122 	struct mutex		 lock;
123 };
124 
125 static const struct u32_fract vadc_prescale_ratios[] = {
126 	{ .numerator =  1, .denominator =  1 },
127 	{ .numerator =  1, .denominator =  3 },
128 	{ .numerator =  1, .denominator =  4 },
129 	{ .numerator =  1, .denominator =  6 },
130 	{ .numerator =  1, .denominator = 20 },
131 	{ .numerator =  1, .denominator =  8 },
132 	{ .numerator = 10, .denominator = 81 },
133 	{ .numerator =  1, .denominator = 10 },
134 };
135 
136 static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
137 {
138 	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
139 }
140 
141 static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
142 {
143 	return regmap_write(vadc->regmap, vadc->base + offset, data);
144 }
145 
146 static int vadc_reset(struct vadc_priv *vadc)
147 {
148 	u8 data;
149 	int ret;
150 
151 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
152 	if (ret)
153 		return ret;
154 
155 	ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
156 	if (ret)
157 		return ret;
158 
159 	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
160 	if (ret)
161 		return ret;
162 
163 	data |= VADC_FOLLOW_WARM_RB;
164 
165 	return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
166 }
167 
168 static int vadc_set_state(struct vadc_priv *vadc, bool state)
169 {
170 	return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
171 }
172 
173 static void vadc_show_status(struct vadc_priv *vadc)
174 {
175 	u8 mode, sta1, chan, dig, en, req;
176 	int ret;
177 
178 	ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
179 	if (ret)
180 		return;
181 
182 	ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
183 	if (ret)
184 		return;
185 
186 	ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
187 	if (ret)
188 		return;
189 
190 	ret = vadc_read(vadc, VADC_CONV_REQ, &req);
191 	if (ret)
192 		return;
193 
194 	ret = vadc_read(vadc, VADC_STATUS1, &sta1);
195 	if (ret)
196 		return;
197 
198 	ret = vadc_read(vadc, VADC_EN_CTL1, &en);
199 	if (ret)
200 		return;
201 
202 	dev_err(vadc->dev,
203 		"mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
204 		mode, en, chan, dig, req, sta1);
205 }
206 
207 static int vadc_configure(struct vadc_priv *vadc,
208 			  struct vadc_channel_prop *prop)
209 {
210 	u8 decimation, mode_ctrl;
211 	int ret;
212 
213 	/* Mode selection */
214 	mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
215 		     VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
216 	ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
217 	if (ret)
218 		return ret;
219 
220 	/* Channel selection */
221 	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
222 	if (ret)
223 		return ret;
224 
225 	/* Digital parameter setup */
226 	decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
227 	ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
228 	if (ret)
229 		return ret;
230 
231 	/* HW settle time delay */
232 	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
233 	if (ret)
234 		return ret;
235 
236 	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
237 	if (ret)
238 		return ret;
239 
240 	if (prop->avg_samples)
241 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
242 	else
243 		ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
244 
245 	return ret;
246 }
247 
248 static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
249 {
250 	unsigned int count, retry;
251 	u8 sta1;
252 	int ret;
253 
254 	retry = interval_us / VADC_CONV_TIME_MIN_US;
255 
256 	for (count = 0; count < retry; count++) {
257 		ret = vadc_read(vadc, VADC_STATUS1, &sta1);
258 		if (ret)
259 			return ret;
260 
261 		sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
262 		if (sta1 == VADC_STATUS1_EOC)
263 			return 0;
264 
265 		usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
266 	}
267 
268 	vadc_show_status(vadc);
269 
270 	return -ETIMEDOUT;
271 }
272 
273 static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
274 {
275 	int ret;
276 
277 	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
278 	if (ret)
279 		return ret;
280 
281 	*data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
282 
283 	return 0;
284 }
285 
286 static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
287 						  unsigned int num)
288 {
289 	unsigned int i;
290 
291 	for (i = 0; i < vadc->nchannels; i++)
292 		if (vadc->chan_props[i].channel == num)
293 			return &vadc->chan_props[i];
294 
295 	dev_dbg(vadc->dev, "no such channel %02x\n", num);
296 
297 	return NULL;
298 }
299 
300 static int vadc_do_conversion(struct vadc_priv *vadc,
301 			      struct vadc_channel_prop *prop, u16 *data)
302 {
303 	unsigned int timeout;
304 	int ret;
305 
306 	mutex_lock(&vadc->lock);
307 
308 	ret = vadc_configure(vadc, prop);
309 	if (ret)
310 		goto unlock;
311 
312 	if (!vadc->poll_eoc)
313 		reinit_completion(&vadc->complete);
314 
315 	ret = vadc_set_state(vadc, true);
316 	if (ret)
317 		goto unlock;
318 
319 	ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
320 	if (ret)
321 		goto err_disable;
322 
323 	timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
324 
325 	if (vadc->poll_eoc) {
326 		ret = vadc_poll_wait_eoc(vadc, timeout);
327 	} else {
328 		ret = wait_for_completion_timeout(&vadc->complete, timeout);
329 		if (!ret) {
330 			ret = -ETIMEDOUT;
331 			goto err_disable;
332 		}
333 
334 		/* Double check conversion status */
335 		ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
336 		if (ret)
337 			goto err_disable;
338 	}
339 
340 	ret = vadc_read_result(vadc, data);
341 
342 err_disable:
343 	vadc_set_state(vadc, false);
344 	if (ret)
345 		dev_err(vadc->dev, "conversion failed\n");
346 unlock:
347 	mutex_unlock(&vadc->lock);
348 	return ret;
349 }
350 
351 static int vadc_measure_ref_points(struct vadc_priv *vadc)
352 {
353 	struct vadc_channel_prop *prop;
354 	u16 read_1, read_2;
355 	int ret;
356 
357 	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
358 	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
359 
360 	prop = vadc_get_channel(vadc, VADC_REF_1250MV);
361 	ret = vadc_do_conversion(vadc, prop, &read_1);
362 	if (ret)
363 		goto err;
364 
365 	/* Try with buffered 625mV channel first */
366 	prop = vadc_get_channel(vadc, VADC_SPARE1);
367 	if (!prop)
368 		prop = vadc_get_channel(vadc, VADC_REF_625MV);
369 
370 	ret = vadc_do_conversion(vadc, prop, &read_2);
371 	if (ret)
372 		goto err;
373 
374 	if (read_1 == read_2) {
375 		ret = -EINVAL;
376 		goto err;
377 	}
378 
379 	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
380 	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
381 
382 	/* Ratiometric calibration */
383 	prop = vadc_get_channel(vadc, VADC_VDD_VADC);
384 	ret = vadc_do_conversion(vadc, prop, &read_1);
385 	if (ret)
386 		goto err;
387 
388 	prop = vadc_get_channel(vadc, VADC_GND_REF);
389 	ret = vadc_do_conversion(vadc, prop, &read_2);
390 	if (ret)
391 		goto err;
392 
393 	if (read_1 == read_2) {
394 		ret = -EINVAL;
395 		goto err;
396 	}
397 
398 	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
399 	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
400 err:
401 	if (ret)
402 		dev_err(vadc->dev, "measure reference points failed\n");
403 
404 	return ret;
405 }
406 
407 static int vadc_prescaling_from_dt(u32 numerator, u32 denominator)
408 {
409 	unsigned int pre;
410 
411 	for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
412 		if (vadc_prescale_ratios[pre].numerator == numerator &&
413 		    vadc_prescale_ratios[pre].denominator == denominator)
414 			break;
415 
416 	if (pre == ARRAY_SIZE(vadc_prescale_ratios))
417 		return -EINVAL;
418 
419 	return pre;
420 }
421 
422 static int vadc_hw_settle_time_from_dt(u32 value)
423 {
424 	if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
425 		return -EINVAL;
426 
427 	if (value <= 1000)
428 		value /= 100;
429 	else
430 		value = value / 2000 + 10;
431 
432 	return value;
433 }
434 
435 static int vadc_avg_samples_from_dt(u32 value)
436 {
437 	if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
438 		return -EINVAL;
439 
440 	return __ffs64(value);
441 }
442 
443 static int vadc_read_raw(struct iio_dev *indio_dev,
444 			 struct iio_chan_spec const *chan, int *val, int *val2,
445 			 long mask)
446 {
447 	struct vadc_priv *vadc = iio_priv(indio_dev);
448 	struct vadc_channel_prop *prop;
449 	u16 adc_code;
450 	int ret;
451 
452 	switch (mask) {
453 	case IIO_CHAN_INFO_PROCESSED:
454 		prop = &vadc->chan_props[chan->address];
455 		ret = vadc_do_conversion(vadc, prop, &adc_code);
456 		if (ret)
457 			break;
458 
459 		ret = qcom_vadc_scale(prop->scale_fn_type,
460 				&vadc->graph[prop->calibration],
461 				&vadc_prescale_ratios[prop->prescale],
462 				(prop->calibration == VADC_CALIB_ABSOLUTE),
463 				adc_code, val);
464 		if (ret)
465 			break;
466 
467 		return IIO_VAL_INT;
468 	case IIO_CHAN_INFO_RAW:
469 		prop = &vadc->chan_props[chan->address];
470 		ret = vadc_do_conversion(vadc, prop, &adc_code);
471 		if (ret)
472 			break;
473 
474 		*val = (int)adc_code;
475 		return IIO_VAL_INT;
476 	default:
477 		ret = -EINVAL;
478 		break;
479 	}
480 
481 	return ret;
482 }
483 
484 static int vadc_of_xlate(struct iio_dev *indio_dev,
485 			 const struct of_phandle_args *iiospec)
486 {
487 	struct vadc_priv *vadc = iio_priv(indio_dev);
488 	unsigned int i;
489 
490 	for (i = 0; i < vadc->nchannels; i++)
491 		if (vadc->iio_chans[i].channel == iiospec->args[0])
492 			return i;
493 
494 	return -EINVAL;
495 }
496 
497 static const struct iio_info vadc_info = {
498 	.read_raw = vadc_read_raw,
499 	.of_xlate = vadc_of_xlate,
500 };
501 
502 struct vadc_channels {
503 	const char *datasheet_name;
504 	unsigned int prescale_index;
505 	enum iio_chan_type type;
506 	long info_mask;
507 	enum vadc_scale_fn_type scale_fn_type;
508 };
509 
510 #define VADC_CHAN(_dname, _type, _mask, _pre, _scale)			\
511 	[VADC_##_dname] = {						\
512 		.datasheet_name = __stringify(_dname),			\
513 		.prescale_index = _pre,					\
514 		.type = _type,						\
515 		.info_mask = _mask,					\
516 		.scale_fn_type = _scale					\
517 	},								\
518 
519 #define VADC_NO_CHAN(_dname, _type, _mask, _pre)			\
520 	[VADC_##_dname] = {						\
521 		.datasheet_name = __stringify(_dname),			\
522 		.prescale_index = _pre,					\
523 		.type = _type,						\
524 		.info_mask = _mask					\
525 	},
526 
527 #define VADC_CHAN_TEMP(_dname, _pre, _scale)				\
528 	VADC_CHAN(_dname, IIO_TEMP,					\
529 		BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),	\
530 		_pre, _scale)						\
531 
532 #define VADC_CHAN_VOLT(_dname, _pre, _scale)				\
533 	VADC_CHAN(_dname, IIO_VOLTAGE,					\
534 		  BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
535 		  _pre, _scale)						\
536 
537 #define VADC_CHAN_NO_SCALE(_dname, _pre)				\
538 	VADC_NO_CHAN(_dname, IIO_VOLTAGE,				\
539 		  BIT(IIO_CHAN_INFO_RAW),				\
540 		  _pre)							\
541 
542 /*
543  * The array represents all possible ADC channels found in the supported PMICs.
544  * Every index in the array is equal to the channel number per datasheet. The
545  * gaps in the array should be treated as reserved channels.
546  */
547 static const struct vadc_channels vadc_chans[] = {
548 	VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
549 	VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
550 	VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
551 	VADC_CHAN_NO_SCALE(SPARE1_03, 1)
552 	VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
553 	VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
554 	VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
555 	VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
556 	VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
557 	VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
558 	VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
559 	VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
560 	VADC_CHAN_NO_SCALE(SPARE1, 0)
561 	VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
562 	VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
563 	VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
564 
565 	VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
566 	VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
567 	VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
568 	VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
569 	VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
570 	VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
571 	VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
572 	VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
573 	VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
574 	VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
575 	VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
576 	VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
577 	VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
578 	VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
579 	VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
580 	VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
581 
582 	VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
583 	VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
584 	VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
585 	VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
586 	VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
587 	VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
588 	VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
589 	VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
590 	VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
591 	VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
592 	VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
593 	VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
594 	VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
595 	VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
596 	VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
597 	VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
598 
599 	VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
600 	VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT)
601 	VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
602 	VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
603 	VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
604 	VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
605 	VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
606 	VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
607 	VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
608 	VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
609 	VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
610 	VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
611 	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
612 
613 	VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
614 	VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
615 	VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
616 	VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
617 	VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
618 	VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
619 	VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
620 	VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
621 	VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
622 	VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
623 	VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
624 
625 	VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
626 	VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
627 	VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
628 	VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
629 	VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
630 	VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
631 	VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
632 	VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
633 	VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
634 	VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
635 	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
636 
637 	VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
638 	VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
639 	VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
640 	VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
641 	VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
642 	VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
643 	VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
644 	VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
645 	VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
646 	VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
647 	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
648 };
649 
650 static int vadc_get_dt_channel_data(struct device *dev,
651 				    struct vadc_channel_prop *prop,
652 				    struct device_node *node)
653 {
654 	const char *name = node->name;
655 	u32 chan, value, varr[2];
656 	int ret;
657 
658 	ret = of_property_read_u32(node, "reg", &chan);
659 	if (ret) {
660 		dev_err(dev, "invalid channel number %s\n", name);
661 		return ret;
662 	}
663 
664 	if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
665 		dev_err(dev, "%s invalid channel number %d\n", name, chan);
666 		return -EINVAL;
667 	}
668 
669 	/* the channel has DT description */
670 	prop->channel = chan;
671 
672 	ret = of_property_read_u32(node, "qcom,decimation", &value);
673 	if (!ret) {
674 		ret = qcom_vadc_decimation_from_dt(value);
675 		if (ret < 0) {
676 			dev_err(dev, "%02x invalid decimation %d\n",
677 				chan, value);
678 			return ret;
679 		}
680 		prop->decimation = ret;
681 	} else {
682 		prop->decimation = VADC_DEF_DECIMATION;
683 	}
684 
685 	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
686 	if (!ret) {
687 		ret = vadc_prescaling_from_dt(varr[0], varr[1]);
688 		if (ret < 0) {
689 			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
690 				chan, varr[0], varr[1]);
691 			return ret;
692 		}
693 		prop->prescale = ret;
694 	} else {
695 		prop->prescale = vadc_chans[prop->channel].prescale_index;
696 	}
697 
698 	ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
699 	if (!ret) {
700 		ret = vadc_hw_settle_time_from_dt(value);
701 		if (ret < 0) {
702 			dev_err(dev, "%02x invalid hw-settle-time %d us\n",
703 				chan, value);
704 			return ret;
705 		}
706 		prop->hw_settle_time = ret;
707 	} else {
708 		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
709 	}
710 
711 	ret = of_property_read_u32(node, "qcom,avg-samples", &value);
712 	if (!ret) {
713 		ret = vadc_avg_samples_from_dt(value);
714 		if (ret < 0) {
715 			dev_err(dev, "%02x invalid avg-samples %d\n",
716 				chan, value);
717 			return ret;
718 		}
719 		prop->avg_samples = ret;
720 	} else {
721 		prop->avg_samples = VADC_DEF_AVG_SAMPLES;
722 	}
723 
724 	if (of_property_read_bool(node, "qcom,ratiometric"))
725 		prop->calibration = VADC_CALIB_RATIOMETRIC;
726 	else
727 		prop->calibration = VADC_CALIB_ABSOLUTE;
728 
729 	dev_dbg(dev, "%02x name %s\n", chan, name);
730 
731 	return 0;
732 }
733 
734 static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
735 {
736 	const struct vadc_channels *vadc_chan;
737 	struct iio_chan_spec *iio_chan;
738 	struct vadc_channel_prop prop;
739 	struct device_node *child;
740 	unsigned int index = 0;
741 	int ret;
742 
743 	vadc->nchannels = of_get_available_child_count(node);
744 	if (!vadc->nchannels)
745 		return -EINVAL;
746 
747 	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
748 				       sizeof(*vadc->iio_chans), GFP_KERNEL);
749 	if (!vadc->iio_chans)
750 		return -ENOMEM;
751 
752 	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
753 					sizeof(*vadc->chan_props), GFP_KERNEL);
754 	if (!vadc->chan_props)
755 		return -ENOMEM;
756 
757 	iio_chan = vadc->iio_chans;
758 
759 	for_each_available_child_of_node(node, child) {
760 		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
761 		if (ret) {
762 			of_node_put(child);
763 			return ret;
764 		}
765 
766 		prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
767 		vadc->chan_props[index] = prop;
768 
769 		vadc_chan = &vadc_chans[prop.channel];
770 
771 		iio_chan->channel = prop.channel;
772 		iio_chan->datasheet_name = vadc_chan->datasheet_name;
773 		iio_chan->info_mask_separate = vadc_chan->info_mask;
774 		iio_chan->type = vadc_chan->type;
775 		iio_chan->indexed = 1;
776 		iio_chan->address = index++;
777 
778 		iio_chan++;
779 	}
780 
781 	/* These channels are mandatory, they are used as reference points */
782 	if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
783 		dev_err(vadc->dev, "Please define 1.25V channel\n");
784 		return -ENODEV;
785 	}
786 
787 	if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
788 		dev_err(vadc->dev, "Please define 0.625V channel\n");
789 		return -ENODEV;
790 	}
791 
792 	if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
793 		dev_err(vadc->dev, "Please define VDD channel\n");
794 		return -ENODEV;
795 	}
796 
797 	if (!vadc_get_channel(vadc, VADC_GND_REF)) {
798 		dev_err(vadc->dev, "Please define GND channel\n");
799 		return -ENODEV;
800 	}
801 
802 	return 0;
803 }
804 
805 static irqreturn_t vadc_isr(int irq, void *dev_id)
806 {
807 	struct vadc_priv *vadc = dev_id;
808 
809 	complete(&vadc->complete);
810 
811 	return IRQ_HANDLED;
812 }
813 
814 static int vadc_check_revision(struct vadc_priv *vadc)
815 {
816 	u8 val;
817 	int ret;
818 
819 	ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
820 	if (ret)
821 		return ret;
822 
823 	if (val < VADC_PERPH_TYPE_ADC) {
824 		dev_err(vadc->dev, "%d is not ADC\n", val);
825 		return -ENODEV;
826 	}
827 
828 	ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
829 	if (ret)
830 		return ret;
831 
832 	if (val < VADC_PERPH_SUBTYPE_VADC) {
833 		dev_err(vadc->dev, "%d is not VADC\n", val);
834 		return -ENODEV;
835 	}
836 
837 	ret = vadc_read(vadc, VADC_REVISION2, &val);
838 	if (ret)
839 		return ret;
840 
841 	if (val < VADC_REVISION2_SUPPORTED_VADC) {
842 		dev_err(vadc->dev, "revision %d not supported\n", val);
843 		return -ENODEV;
844 	}
845 
846 	return 0;
847 }
848 
849 static int vadc_probe(struct platform_device *pdev)
850 {
851 	struct device_node *node = pdev->dev.of_node;
852 	struct device *dev = &pdev->dev;
853 	struct iio_dev *indio_dev;
854 	struct vadc_priv *vadc;
855 	struct regmap *regmap;
856 	int ret, irq_eoc;
857 	u32 reg;
858 
859 	regmap = dev_get_regmap(dev->parent, NULL);
860 	if (!regmap)
861 		return -ENODEV;
862 
863 	ret = of_property_read_u32(node, "reg", &reg);
864 	if (ret < 0)
865 		return ret;
866 
867 	indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
868 	if (!indio_dev)
869 		return -ENOMEM;
870 
871 	vadc = iio_priv(indio_dev);
872 	vadc->regmap = regmap;
873 	vadc->dev = dev;
874 	vadc->base = reg;
875 	vadc->are_ref_measured = false;
876 	init_completion(&vadc->complete);
877 	mutex_init(&vadc->lock);
878 
879 	ret = vadc_check_revision(vadc);
880 	if (ret)
881 		return ret;
882 
883 	ret = vadc_get_dt_data(vadc, node);
884 	if (ret)
885 		return ret;
886 
887 	irq_eoc = platform_get_irq(pdev, 0);
888 	if (irq_eoc < 0) {
889 		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
890 			return irq_eoc;
891 		vadc->poll_eoc = true;
892 	} else {
893 		ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
894 				       "spmi-vadc", vadc);
895 		if (ret)
896 			return ret;
897 	}
898 
899 	ret = vadc_reset(vadc);
900 	if (ret) {
901 		dev_err(dev, "reset failed\n");
902 		return ret;
903 	}
904 
905 	ret = vadc_measure_ref_points(vadc);
906 	if (ret)
907 		return ret;
908 
909 	indio_dev->name = pdev->name;
910 	indio_dev->modes = INDIO_DIRECT_MODE;
911 	indio_dev->info = &vadc_info;
912 	indio_dev->channels = vadc->iio_chans;
913 	indio_dev->num_channels = vadc->nchannels;
914 
915 	return devm_iio_device_register(dev, indio_dev);
916 }
917 
918 static const struct of_device_id vadc_match_table[] = {
919 	{ .compatible = "qcom,spmi-vadc" },
920 	{ }
921 };
922 MODULE_DEVICE_TABLE(of, vadc_match_table);
923 
924 static struct platform_driver vadc_driver = {
925 	.driver = {
926 		   .name = "qcom-spmi-vadc",
927 		   .of_match_table = vadc_match_table,
928 	},
929 	.probe = vadc_probe,
930 };
931 module_platform_driver(vadc_driver);
932 
933 MODULE_ALIAS("platform:qcom-spmi-vadc");
934 MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
935 MODULE_LICENSE("GPL v2");
936 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
937 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
938