1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/bitops.h>
  7#include <linux/completion.h>
  8#include <linux/delay.h>
  9#include <linux/err.h>
 10#include <linux/iio/iio.h>
 11#include <linux/interrupt.h>
 12#include <linux/kernel.h>
 13#include <linux/math64.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/platform_device.h>
 17#include <linux/regmap.h>
 18#include <linux/slab.h>
 19#include <linux/log2.h>
 20
 21#include <dt-bindings/iio/qcom,spmi-vadc.h>
 22
 23#include "qcom-vadc-common.h"
 24
 25/* VADC register and bit definitions */
 26#define VADC_REVISION2				0x1
 27#define VADC_REVISION2_SUPPORTED_VADC		1
 28
 29#define VADC_PERPH_TYPE				0x4
 30#define VADC_PERPH_TYPE_ADC			8
 31
 32#define VADC_PERPH_SUBTYPE			0x5
 33#define VADC_PERPH_SUBTYPE_VADC			1
 34
 35#define VADC_STATUS1				0x8
 36#define VADC_STATUS1_OP_MODE			4
 37#define VADC_STATUS1_REQ_STS			BIT(1)
 38#define VADC_STATUS1_EOC			BIT(0)
 39#define VADC_STATUS1_REQ_STS_EOC_MASK		0x3
 40
 41#define VADC_MODE_CTL				0x40
 42#define VADC_OP_MODE_SHIFT			3
 43#define VADC_OP_MODE_NORMAL			0
 44#define VADC_AMUX_TRIM_EN			BIT(1)
 45#define VADC_ADC_TRIM_EN			BIT(0)
 46
 47#define VADC_EN_CTL1				0x46
 48#define VADC_EN_CTL1_SET			BIT(7)
 49
 50#define VADC_ADC_CH_SEL_CTL			0x48
 51
 52#define VADC_ADC_DIG_PARAM			0x50
 53#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT	2
 54
 55#define VADC_HW_SETTLE_DELAY			0x51
 56
 57#define VADC_CONV_REQ				0x52
 58#define VADC_CONV_REQ_SET			BIT(7)
 59
 60#define VADC_FAST_AVG_CTL			0x5a
 61#define VADC_FAST_AVG_EN			0x5b
 62#define VADC_FAST_AVG_EN_SET			BIT(7)
 63
 64#define VADC_ACCESS				0xd0
 65#define VADC_ACCESS_DATA			0xa5
 66
 67#define VADC_PERH_RESET_CTL3			0xda
 68#define VADC_FOLLOW_WARM_RB			BIT(2)
 69
 70#define VADC_DATA				0x60	/* 16 bits */
 71
 72#define VADC_CHAN_MIN			VADC_USBIN
 73#define VADC_CHAN_MAX			VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
 74
 75/**
 76 * struct vadc_channel_prop - VADC channel property.
 77 * @channel: channel number, refer to the channel list.
 78 * @calibration: calibration type.
 79 * @decimation: sampling rate supported for the channel.
 80 * @prescale: channel scaling performed on the input signal.
 81 * @hw_settle_time: the time between AMUX being configured and the
 82 *	start of conversion.
 83 * @avg_samples: ability to provide single result from the ADC
 84 *	that is an average of multiple measurements.
 85 * @scale_fn_type: Represents the scaling function to convert voltage
 86 *	physical units desired by the client for the channel.
 87 */
 88struct vadc_channel_prop {
 89	unsigned int channel;
 90	enum vadc_calibration calibration;
 91	unsigned int decimation;
 92	unsigned int prescale;
 93	unsigned int hw_settle_time;
 94	unsigned int avg_samples;
 95	enum vadc_scale_fn_type scale_fn_type;
 96};
 97
 98/**
 99 * struct vadc_priv - VADC private structure.
100 * @regmap: pointer to struct regmap.
101 * @dev: pointer to struct device.
102 * @base: base address for the ADC peripheral.
103 * @nchannels: number of VADC channels.
104 * @chan_props: array of VADC channel properties.
105 * @iio_chans: array of IIO channels specification.
106 * @are_ref_measured: are reference points measured.
107 * @poll_eoc: use polling instead of interrupt.
108 * @complete: VADC result notification after interrupt is received.
109 * @graph: store parameters for calibration.
110 * @lock: ADC lock for access to the peripheral.
111 */
112struct vadc_priv {
113	struct regmap		 *regmap;
114	struct device		 *dev;
115	u16			 base;
116	unsigned int		 nchannels;
117	struct vadc_channel_prop *chan_props;
118	struct iio_chan_spec	 *iio_chans;
119	bool			 are_ref_measured;
120	bool			 poll_eoc;
121	struct completion	 complete;
122	struct vadc_linear_graph graph[2];
123	struct mutex		 lock;
124};
125
126static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
127	{.num =  1, .den =  1},
128	{.num =  1, .den =  3},
129	{.num =  1, .den =  4},
130	{.num =  1, .den =  6},
131	{.num =  1, .den = 20},
132	{.num =  1, .den =  8},
133	{.num = 10, .den = 81},
134	{.num =  1, .den = 10}
135};
136
137static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
138{
139	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
140}
141
142static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
143{
144	return regmap_write(vadc->regmap, vadc->base + offset, data);
145}
146
147static int vadc_reset(struct vadc_priv *vadc)
148{
149	u8 data;
150	int ret;
151
152	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
153	if (ret)
154		return ret;
155
156	ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
157	if (ret)
158		return ret;
159
160	ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
161	if (ret)
162		return ret;
163
164	data |= VADC_FOLLOW_WARM_RB;
165
166	return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
167}
168
169static int vadc_set_state(struct vadc_priv *vadc, bool state)
170{
171	return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
172}
173
174static void vadc_show_status(struct vadc_priv *vadc)
175{
176	u8 mode, sta1, chan, dig, en, req;
177	int ret;
178
179	ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
180	if (ret)
181		return;
182
183	ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
184	if (ret)
185		return;
186
187	ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
188	if (ret)
189		return;
190
191	ret = vadc_read(vadc, VADC_CONV_REQ, &req);
192	if (ret)
193		return;
194
195	ret = vadc_read(vadc, VADC_STATUS1, &sta1);
196	if (ret)
197		return;
198
199	ret = vadc_read(vadc, VADC_EN_CTL1, &en);
200	if (ret)
201		return;
202
203	dev_err(vadc->dev,
204		"mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
205		mode, en, chan, dig, req, sta1);
206}
207
208static int vadc_configure(struct vadc_priv *vadc,
209			  struct vadc_channel_prop *prop)
210{
211	u8 decimation, mode_ctrl;
212	int ret;
213
214	/* Mode selection */
215	mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
216		     VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
217	ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
218	if (ret)
219		return ret;
220
221	/* Channel selection */
222	ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
223	if (ret)
224		return ret;
225
226	/* Digital parameter setup */
227	decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
228	ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
229	if (ret)
230		return ret;
231
232	/* HW settle time delay */
233	ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
234	if (ret)
235		return ret;
236
237	ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
238	if (ret)
239		return ret;
240
241	if (prop->avg_samples)
242		ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
243	else
244		ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
245
246	return ret;
247}
248
249static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
250{
251	unsigned int count, retry;
252	u8 sta1;
253	int ret;
254
255	retry = interval_us / VADC_CONV_TIME_MIN_US;
256
257	for (count = 0; count < retry; count++) {
258		ret = vadc_read(vadc, VADC_STATUS1, &sta1);
259		if (ret)
260			return ret;
261
262		sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
263		if (sta1 == VADC_STATUS1_EOC)
264			return 0;
265
266		usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
267	}
268
269	vadc_show_status(vadc);
270
271	return -ETIMEDOUT;
272}
273
274static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
275{
276	int ret;
277
278	ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
279	if (ret)
280		return ret;
281
282	*data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
283
284	return 0;
285}
286
287static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
288						  unsigned int num)
289{
290	unsigned int i;
291
292	for (i = 0; i < vadc->nchannels; i++)
293		if (vadc->chan_props[i].channel == num)
294			return &vadc->chan_props[i];
295
296	dev_dbg(vadc->dev, "no such channel %02x\n", num);
297
298	return NULL;
299}
300
301static int vadc_do_conversion(struct vadc_priv *vadc,
302			      struct vadc_channel_prop *prop, u16 *data)
303{
304	unsigned int timeout;
305	int ret;
306
307	mutex_lock(&vadc->lock);
308
309	ret = vadc_configure(vadc, prop);
310	if (ret)
311		goto unlock;
312
313	if (!vadc->poll_eoc)
314		reinit_completion(&vadc->complete);
315
316	ret = vadc_set_state(vadc, true);
317	if (ret)
318		goto unlock;
319
320	ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
321	if (ret)
322		goto err_disable;
323
324	timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
325
326	if (vadc->poll_eoc) {
327		ret = vadc_poll_wait_eoc(vadc, timeout);
328	} else {
329		ret = wait_for_completion_timeout(&vadc->complete, timeout);
330		if (!ret) {
331			ret = -ETIMEDOUT;
332			goto err_disable;
333		}
334
335		/* Double check conversion status */
336		ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
337		if (ret)
338			goto err_disable;
339	}
340
341	ret = vadc_read_result(vadc, data);
342
343err_disable:
344	vadc_set_state(vadc, false);
345	if (ret)
346		dev_err(vadc->dev, "conversion failed\n");
347unlock:
348	mutex_unlock(&vadc->lock);
349	return ret;
350}
351
352static int vadc_measure_ref_points(struct vadc_priv *vadc)
353{
354	struct vadc_channel_prop *prop;
355	u16 read_1, read_2;
356	int ret;
357
358	vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
359	vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
360
361	prop = vadc_get_channel(vadc, VADC_REF_1250MV);
362	ret = vadc_do_conversion(vadc, prop, &read_1);
363	if (ret)
364		goto err;
365
366	/* Try with buffered 625mV channel first */
367	prop = vadc_get_channel(vadc, VADC_SPARE1);
368	if (!prop)
369		prop = vadc_get_channel(vadc, VADC_REF_625MV);
370
371	ret = vadc_do_conversion(vadc, prop, &read_2);
372	if (ret)
373		goto err;
374
375	if (read_1 == read_2) {
376		ret = -EINVAL;
377		goto err;
378	}
379
380	vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
381	vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
382
383	/* Ratiometric calibration */
384	prop = vadc_get_channel(vadc, VADC_VDD_VADC);
385	ret = vadc_do_conversion(vadc, prop, &read_1);
386	if (ret)
387		goto err;
388
389	prop = vadc_get_channel(vadc, VADC_GND_REF);
390	ret = vadc_do_conversion(vadc, prop, &read_2);
391	if (ret)
392		goto err;
393
394	if (read_1 == read_2) {
395		ret = -EINVAL;
396		goto err;
397	}
398
399	vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
400	vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
401err:
402	if (ret)
403		dev_err(vadc->dev, "measure reference points failed\n");
404
405	return ret;
406}
407
408static int vadc_prescaling_from_dt(u32 num, u32 den)
409{
410	unsigned int pre;
411
412	for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
413		if (vadc_prescale_ratios[pre].num == num &&
414		    vadc_prescale_ratios[pre].den == den)
415			break;
416
417	if (pre == ARRAY_SIZE(vadc_prescale_ratios))
418		return -EINVAL;
419
420	return pre;
421}
422
423static int vadc_hw_settle_time_from_dt(u32 value)
424{
425	if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
426		return -EINVAL;
427
428	if (value <= 1000)
429		value /= 100;
430	else
431		value = value / 2000 + 10;
432
433	return value;
434}
435
436static int vadc_avg_samples_from_dt(u32 value)
437{
438	if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
439		return -EINVAL;
440
441	return __ffs64(value);
442}
443
444static int vadc_read_raw(struct iio_dev *indio_dev,
445			 struct iio_chan_spec const *chan, int *val, int *val2,
446			 long mask)
447{
448	struct vadc_priv *vadc = iio_priv(indio_dev);
449	struct vadc_channel_prop *prop;
450	u16 adc_code;
451	int ret;
452
453	switch (mask) {
454	case IIO_CHAN_INFO_PROCESSED:
455		prop = &vadc->chan_props[chan->address];
456		ret = vadc_do_conversion(vadc, prop, &adc_code);
457		if (ret)
458			break;
459
460		ret = qcom_vadc_scale(prop->scale_fn_type,
461				&vadc->graph[prop->calibration],
462				&vadc_prescale_ratios[prop->prescale],
463				(prop->calibration == VADC_CALIB_ABSOLUTE),
464				adc_code, val);
465		if (ret)
466			break;
467
468		return IIO_VAL_INT;
469	case IIO_CHAN_INFO_RAW:
470		prop = &vadc->chan_props[chan->address];
471		ret = vadc_do_conversion(vadc, prop, &adc_code);
472		if (ret)
473			break;
474
475		*val = (int)adc_code;
476		return IIO_VAL_INT;
477	default:
478		ret = -EINVAL;
479		break;
480	}
481
482	return ret;
483}
484
485static int vadc_of_xlate(struct iio_dev *indio_dev,
486			 const struct of_phandle_args *iiospec)
487{
488	struct vadc_priv *vadc = iio_priv(indio_dev);
489	unsigned int i;
490
491	for (i = 0; i < vadc->nchannels; i++)
492		if (vadc->iio_chans[i].channel == iiospec->args[0])
493			return i;
494
495	return -EINVAL;
496}
497
498static const struct iio_info vadc_info = {
499	.read_raw = vadc_read_raw,
500	.of_xlate = vadc_of_xlate,
501};
502
503struct vadc_channels {
504	const char *datasheet_name;
505	unsigned int prescale_index;
506	enum iio_chan_type type;
507	long info_mask;
508	enum vadc_scale_fn_type scale_fn_type;
509};
510
511#define VADC_CHAN(_dname, _type, _mask, _pre, _scale)			\
512	[VADC_##_dname] = {						\
513		.datasheet_name = __stringify(_dname),			\
514		.prescale_index = _pre,					\
515		.type = _type,						\
516		.info_mask = _mask,					\
517		.scale_fn_type = _scale					\
518	},								\
519
520#define VADC_NO_CHAN(_dname, _type, _mask, _pre)			\
521	[VADC_##_dname] = {						\
522		.datasheet_name = __stringify(_dname),			\
523		.prescale_index = _pre,					\
524		.type = _type,						\
525		.info_mask = _mask					\
526	},
527
528#define VADC_CHAN_TEMP(_dname, _pre, _scale)				\
529	VADC_CHAN(_dname, IIO_TEMP,					\
530		BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),	\
531		_pre, _scale)						\
532
533#define VADC_CHAN_VOLT(_dname, _pre, _scale)				\
534	VADC_CHAN(_dname, IIO_VOLTAGE,					\
535		  BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
536		  _pre, _scale)						\
537
538#define VADC_CHAN_NO_SCALE(_dname, _pre)				\
539	VADC_NO_CHAN(_dname, IIO_VOLTAGE,				\
540		  BIT(IIO_CHAN_INFO_RAW),				\
541		  _pre)							\
542
543/*
544 * The array represents all possible ADC channels found in the supported PMICs.
545 * Every index in the array is equal to the channel number per datasheet. The
546 * gaps in the array should be treated as reserved channels.
547 */
548static const struct vadc_channels vadc_chans[] = {
549	VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
550	VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
551	VADC_CHAN_NO_SCALE(VCHG_SNS, 3)
552	VADC_CHAN_NO_SCALE(SPARE1_03, 1)
553	VADC_CHAN_NO_SCALE(USB_ID_MV, 1)
554	VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
555	VADC_CHAN_NO_SCALE(VBAT_SNS, 1)
556	VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
557	VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
558	VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
559	VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
560	VADC_CHAN_NO_SCALE(CHG_TEMP, 0)
561	VADC_CHAN_NO_SCALE(SPARE1, 0)
562	VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
563	VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
564	VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
565
566	VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0)
567	VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0)
568	VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0)
569	VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0)
570	VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0)
571	VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0)
572	VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0)
573	VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0)
574	VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0)
575	VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0)
576	VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0)
577	VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0)
578	VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0)
579	VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0)
580	VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0)
581	VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0)
582
583	VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1)
584	VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1)
585	VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1)
586	VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1)
587	VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1)
588	VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1)
589	VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1)
590	VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1)
591	VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1)
592	VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1)
593	VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1)
594	VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1)
595	VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1)
596	VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1)
597	VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1)
598	VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
599
600	VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
601	VADC_CHAN_NO_SCALE(LR_MUX2_BAT_ID, 0)
602	VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
603	VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
604	VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
605	VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0)
606	VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0)
607	VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0)
608	VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0)
609	VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0)
610	VADC_CHAN_NO_SCALE(AMUX_PU1, 0)
611	VADC_CHAN_NO_SCALE(AMUX_PU2, 0)
612	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0)
613
614	VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0)
615	VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0)
616	VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0)
617	VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
618	VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
619	VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
620	VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0)
621	VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
622	VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
623	VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0)
624	VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
625
626	VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0)
627	VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0)
628	VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0)
629	VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0)
630	VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0)
631	VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0)
632	VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0)
633	VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0)
634	VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0)
635	VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0)
636	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0)
637
638	VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0)
639	VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0)
640	VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0)
641	VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
642	VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
643	VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
644	VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
645	VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
646	VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
647	VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
648	VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
649};
650
651static int vadc_get_dt_channel_data(struct device *dev,
652				    struct vadc_channel_prop *prop,
653				    struct device_node *node)
654{
655	const char *name = node->name;
656	u32 chan, value, varr[2];
657	int ret;
658
659	ret = of_property_read_u32(node, "reg", &chan);
660	if (ret) {
661		dev_err(dev, "invalid channel number %s\n", name);
662		return ret;
663	}
664
665	if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
666		dev_err(dev, "%s invalid channel number %d\n", name, chan);
667		return -EINVAL;
668	}
669
670	/* the channel has DT description */
671	prop->channel = chan;
672
673	ret = of_property_read_u32(node, "qcom,decimation", &value);
674	if (!ret) {
675		ret = qcom_vadc_decimation_from_dt(value);
676		if (ret < 0) {
677			dev_err(dev, "%02x invalid decimation %d\n",
678				chan, value);
679			return ret;
680		}
681		prop->decimation = ret;
682	} else {
683		prop->decimation = VADC_DEF_DECIMATION;
684	}
685
686	ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
687	if (!ret) {
688		ret = vadc_prescaling_from_dt(varr[0], varr[1]);
689		if (ret < 0) {
690			dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
691				chan, varr[0], varr[1]);
692			return ret;
693		}
694		prop->prescale = ret;
695	} else {
696		prop->prescale = vadc_chans[prop->channel].prescale_index;
697	}
698
699	ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
700	if (!ret) {
701		ret = vadc_hw_settle_time_from_dt(value);
702		if (ret < 0) {
703			dev_err(dev, "%02x invalid hw-settle-time %d us\n",
704				chan, value);
705			return ret;
706		}
707		prop->hw_settle_time = ret;
708	} else {
709		prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
710	}
711
712	ret = of_property_read_u32(node, "qcom,avg-samples", &value);
713	if (!ret) {
714		ret = vadc_avg_samples_from_dt(value);
715		if (ret < 0) {
716			dev_err(dev, "%02x invalid avg-samples %d\n",
717				chan, value);
718			return ret;
719		}
720		prop->avg_samples = ret;
721	} else {
722		prop->avg_samples = VADC_DEF_AVG_SAMPLES;
723	}
724
725	if (of_property_read_bool(node, "qcom,ratiometric"))
726		prop->calibration = VADC_CALIB_RATIOMETRIC;
727	else
728		prop->calibration = VADC_CALIB_ABSOLUTE;
729
730	dev_dbg(dev, "%02x name %s\n", chan, name);
731
732	return 0;
733}
734
735static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
736{
737	const struct vadc_channels *vadc_chan;
738	struct iio_chan_spec *iio_chan;
739	struct vadc_channel_prop prop;
740	struct device_node *child;
741	unsigned int index = 0;
742	int ret;
743
744	vadc->nchannels = of_get_available_child_count(node);
745	if (!vadc->nchannels)
746		return -EINVAL;
747
748	vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
749				       sizeof(*vadc->iio_chans), GFP_KERNEL);
750	if (!vadc->iio_chans)
751		return -ENOMEM;
752
753	vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
754					sizeof(*vadc->chan_props), GFP_KERNEL);
755	if (!vadc->chan_props)
756		return -ENOMEM;
757
758	iio_chan = vadc->iio_chans;
759
760	for_each_available_child_of_node(node, child) {
761		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
762		if (ret) {
763			of_node_put(child);
764			return ret;
765		}
766
767		prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
768		vadc->chan_props[index] = prop;
769
770		vadc_chan = &vadc_chans[prop.channel];
771
772		iio_chan->channel = prop.channel;
773		iio_chan->datasheet_name = vadc_chan->datasheet_name;
774		iio_chan->info_mask_separate = vadc_chan->info_mask;
775		iio_chan->type = vadc_chan->type;
776		iio_chan->indexed = 1;
777		iio_chan->address = index++;
778
779		iio_chan++;
780	}
781
782	/* These channels are mandatory, they are used as reference points */
783	if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
784		dev_err(vadc->dev, "Please define 1.25V channel\n");
785		return -ENODEV;
786	}
787
788	if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
789		dev_err(vadc->dev, "Please define 0.625V channel\n");
790		return -ENODEV;
791	}
792
793	if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
794		dev_err(vadc->dev, "Please define VDD channel\n");
795		return -ENODEV;
796	}
797
798	if (!vadc_get_channel(vadc, VADC_GND_REF)) {
799		dev_err(vadc->dev, "Please define GND channel\n");
800		return -ENODEV;
801	}
802
803	return 0;
804}
805
806static irqreturn_t vadc_isr(int irq, void *dev_id)
807{
808	struct vadc_priv *vadc = dev_id;
809
810	complete(&vadc->complete);
811
812	return IRQ_HANDLED;
813}
814
815static int vadc_check_revision(struct vadc_priv *vadc)
816{
817	u8 val;
818	int ret;
819
820	ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
821	if (ret)
822		return ret;
823
824	if (val < VADC_PERPH_TYPE_ADC) {
825		dev_err(vadc->dev, "%d is not ADC\n", val);
826		return -ENODEV;
827	}
828
829	ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
830	if (ret)
831		return ret;
832
833	if (val < VADC_PERPH_SUBTYPE_VADC) {
834		dev_err(vadc->dev, "%d is not VADC\n", val);
835		return -ENODEV;
836	}
837
838	ret = vadc_read(vadc, VADC_REVISION2, &val);
839	if (ret)
840		return ret;
841
842	if (val < VADC_REVISION2_SUPPORTED_VADC) {
843		dev_err(vadc->dev, "revision %d not supported\n", val);
844		return -ENODEV;
845	}
846
847	return 0;
848}
849
850static int vadc_probe(struct platform_device *pdev)
851{
852	struct device_node *node = pdev->dev.of_node;
853	struct device *dev = &pdev->dev;
854	struct iio_dev *indio_dev;
855	struct vadc_priv *vadc;
856	struct regmap *regmap;
857	int ret, irq_eoc;
858	u32 reg;
859
860	regmap = dev_get_regmap(dev->parent, NULL);
861	if (!regmap)
862		return -ENODEV;
863
864	ret = of_property_read_u32(node, "reg", &reg);
865	if (ret < 0)
866		return ret;
867
868	indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
869	if (!indio_dev)
870		return -ENOMEM;
871
872	vadc = iio_priv(indio_dev);
873	vadc->regmap = regmap;
874	vadc->dev = dev;
875	vadc->base = reg;
876	vadc->are_ref_measured = false;
877	init_completion(&vadc->complete);
878	mutex_init(&vadc->lock);
879
880	ret = vadc_check_revision(vadc);
881	if (ret)
882		return ret;
883
884	ret = vadc_get_dt_data(vadc, node);
885	if (ret)
886		return ret;
887
888	irq_eoc = platform_get_irq(pdev, 0);
889	if (irq_eoc < 0) {
890		if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
891			return irq_eoc;
892		vadc->poll_eoc = true;
893	} else {
894		ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
895				       "spmi-vadc", vadc);
896		if (ret)
897			return ret;
898	}
899
900	ret = vadc_reset(vadc);
901	if (ret) {
902		dev_err(dev, "reset failed\n");
903		return ret;
904	}
905
906	ret = vadc_measure_ref_points(vadc);
907	if (ret)
908		return ret;
909
910	indio_dev->dev.parent = dev;
911	indio_dev->dev.of_node = node;
912	indio_dev->name = pdev->name;
913	indio_dev->modes = INDIO_DIRECT_MODE;
914	indio_dev->info = &vadc_info;
915	indio_dev->channels = vadc->iio_chans;
916	indio_dev->num_channels = vadc->nchannels;
917
918	return devm_iio_device_register(dev, indio_dev);
919}
920
921static const struct of_device_id vadc_match_table[] = {
922	{ .compatible = "qcom,spmi-vadc" },
923	{ }
924};
925MODULE_DEVICE_TABLE(of, vadc_match_table);
926
927static struct platform_driver vadc_driver = {
928	.driver = {
929		   .name = "qcom-spmi-vadc",
930		   .of_match_table = vadc_match_table,
931	},
932	.probe = vadc_probe,
933};
934module_platform_driver(vadc_driver);
935
936MODULE_ALIAS("platform:qcom-spmi-vadc");
937MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
938MODULE_LICENSE("GPL v2");
939MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
940MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");