1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
6 #include <linux/bitops.h>
7 #include <linux/completion.h>
8 #include <linux/delay.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>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/slab.h>
20 #include <linux/log2.h>
22 #include <dt-bindings/iio/qcom,spmi-vadc.h>
24 /* VADC register and bit definitions */
25 #define VADC_REVISION2 0x1
26 #define VADC_REVISION2_SUPPORTED_VADC 1
28 #define VADC_PERPH_TYPE 0x4
29 #define VADC_PERPH_TYPE_ADC 8
31 #define VADC_PERPH_SUBTYPE 0x5
32 #define VADC_PERPH_SUBTYPE_VADC 1
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
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)
46 #define VADC_EN_CTL1 0x46
47 #define VADC_EN_CTL1_SET BIT(7)
49 #define VADC_ADC_CH_SEL_CTL 0x48
51 #define VADC_ADC_DIG_PARAM 0x50
52 #define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
54 #define VADC_HW_SETTLE_DELAY 0x51
56 #define VADC_CONV_REQ 0x52
57 #define VADC_CONV_REQ_SET BIT(7)
59 #define VADC_FAST_AVG_CTL 0x5a
60 #define VADC_FAST_AVG_EN 0x5b
61 #define VADC_FAST_AVG_EN_SET BIT(7)
63 #define VADC_ACCESS 0xd0
64 #define VADC_ACCESS_DATA 0xa5
66 #define VADC_PERH_RESET_CTL3 0xda
67 #define VADC_FOLLOW_WARM_RB BIT(2)
69 #define VADC_DATA 0x60 /* 16 bits */
71 #define VADC_CHAN_MIN VADC_USBIN
72 #define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
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.
87 struct vadc_channel_prop {
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;
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.
112 struct regmap *regmap;
115 unsigned int nchannels;
116 struct vadc_channel_prop *chan_props;
117 struct iio_chan_spec *iio_chans;
118 bool are_ref_measured;
120 struct completion complete;
121 struct vadc_linear_graph graph[2];
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 },
136 static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
138 return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
141 static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
143 return regmap_write(vadc->regmap, vadc->base + offset, data);
146 static int vadc_reset(struct vadc_priv *vadc)
151 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
155 ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
159 ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
163 data |= VADC_FOLLOW_WARM_RB;
165 return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
168 static int vadc_set_state(struct vadc_priv *vadc, bool state)
170 return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
173 static void vadc_show_status(struct vadc_priv *vadc)
175 u8 mode, sta1, chan, dig, en, req;
178 ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
182 ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
186 ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
190 ret = vadc_read(vadc, VADC_CONV_REQ, &req);
194 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
198 ret = vadc_read(vadc, VADC_EN_CTL1, &en);
203 "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
204 mode, en, chan, dig, req, sta1);
207 static int vadc_configure(struct vadc_priv *vadc,
208 struct vadc_channel_prop *prop)
210 u8 decimation, mode_ctrl;
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);
220 /* Channel selection */
221 ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
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);
231 /* HW settle time delay */
232 ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
236 ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
240 if (prop->avg_samples)
241 ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
243 ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
248 static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
250 unsigned int count, retry;
254 retry = interval_us / VADC_CONV_TIME_MIN_US;
256 for (count = 0; count < retry; count++) {
257 ret = vadc_read(vadc, VADC_STATUS1, &sta1);
261 sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
262 if (sta1 == VADC_STATUS1_EOC)
265 usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
268 vadc_show_status(vadc);
273 static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
277 ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
281 *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
286 static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
291 for (i = 0; i < vadc->nchannels; i++)
292 if (vadc->chan_props[i].channel == num)
293 return &vadc->chan_props[i];
295 dev_dbg(vadc->dev, "no such channel %02x\n", num);
300 static int vadc_do_conversion(struct vadc_priv *vadc,
301 struct vadc_channel_prop *prop, u16 *data)
303 unsigned int timeout;
306 mutex_lock(&vadc->lock);
308 ret = vadc_configure(vadc, prop);
313 reinit_completion(&vadc->complete);
315 ret = vadc_set_state(vadc, true);
319 ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
323 timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
325 if (vadc->poll_eoc) {
326 ret = vadc_poll_wait_eoc(vadc, timeout);
328 ret = wait_for_completion_timeout(&vadc->complete, timeout);
334 /* Double check conversion status */
335 ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
340 ret = vadc_read_result(vadc, data);
343 vadc_set_state(vadc, false);
345 dev_err(vadc->dev, "conversion failed\n");
347 mutex_unlock(&vadc->lock);
351 static int vadc_measure_ref_points(struct vadc_priv *vadc)
353 struct vadc_channel_prop *prop;
357 vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
358 vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
360 prop = vadc_get_channel(vadc, VADC_REF_1250MV);
361 ret = vadc_do_conversion(vadc, prop, &read_1);
365 /* Try with buffered 625mV channel first */
366 prop = vadc_get_channel(vadc, VADC_SPARE1);
368 prop = vadc_get_channel(vadc, VADC_REF_625MV);
370 ret = vadc_do_conversion(vadc, prop, &read_2);
374 if (read_1 == read_2) {
379 vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
380 vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
382 /* Ratiometric calibration */
383 prop = vadc_get_channel(vadc, VADC_VDD_VADC);
384 ret = vadc_do_conversion(vadc, prop, &read_1);
388 prop = vadc_get_channel(vadc, VADC_GND_REF);
389 ret = vadc_do_conversion(vadc, prop, &read_2);
393 if (read_1 == read_2) {
398 vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
399 vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
402 dev_err(vadc->dev, "measure reference points failed\n");
407 static int vadc_prescaling_from_dt(u32 numerator, u32 denominator)
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)
416 if (pre == ARRAY_SIZE(vadc_prescale_ratios))
422 static int vadc_hw_settle_time_from_dt(u32 value)
424 if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
430 value = value / 2000 + 10;
435 static int vadc_avg_samples_from_dt(u32 value)
437 if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
440 return __ffs64(value);
443 static int vadc_read_raw(struct iio_dev *indio_dev,
444 struct iio_chan_spec const *chan, int *val, int *val2,
447 struct vadc_priv *vadc = iio_priv(indio_dev);
448 struct vadc_channel_prop *prop;
453 case IIO_CHAN_INFO_PROCESSED:
454 prop = &vadc->chan_props[chan->address];
455 ret = vadc_do_conversion(vadc, prop, &adc_code);
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),
468 case IIO_CHAN_INFO_RAW:
469 prop = &vadc->chan_props[chan->address];
470 ret = vadc_do_conversion(vadc, prop, &adc_code);
474 *val = (int)adc_code;
484 static int vadc_of_xlate(struct iio_dev *indio_dev,
485 const struct of_phandle_args *iiospec)
487 struct vadc_priv *vadc = iio_priv(indio_dev);
490 for (i = 0; i < vadc->nchannels; i++)
491 if (vadc->iio_chans[i].channel == iiospec->args[0])
497 static const struct iio_info vadc_info = {
498 .read_raw = vadc_read_raw,
499 .of_xlate = vadc_of_xlate,
502 struct vadc_channels {
503 const char *datasheet_name;
504 unsigned int prescale_index;
505 enum iio_chan_type type;
507 enum vadc_scale_fn_type scale_fn_type;
510 #define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \
511 [VADC_##_dname] = { \
512 .datasheet_name = __stringify(_dname), \
513 .prescale_index = _pre, \
515 .info_mask = _mask, \
516 .scale_fn_type = _scale \
519 #define VADC_NO_CHAN(_dname, _type, _mask, _pre) \
520 [VADC_##_dname] = { \
521 .datasheet_name = __stringify(_dname), \
522 .prescale_index = _pre, \
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), \
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),\
537 #define VADC_CHAN_NO_SCALE(_dname, _pre) \
538 VADC_NO_CHAN(_dname, IIO_VOLTAGE, \
539 BIT(IIO_CHAN_INFO_RAW), \
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.
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)
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)
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)
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)
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)
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)
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)
650 static int vadc_get_dt_channel_data(struct device *dev,
651 struct vadc_channel_prop *prop,
652 struct device_node *node)
654 const char *name = node->name;
655 u32 chan, value, varr[2];
658 ret = of_property_read_u32(node, "reg", &chan);
660 dev_err(dev, "invalid channel number %s\n", name);
664 if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
665 dev_err(dev, "%s invalid channel number %d\n", name, chan);
669 /* the channel has DT description */
670 prop->channel = chan;
672 ret = of_property_read_u32(node, "qcom,decimation", &value);
674 ret = qcom_vadc_decimation_from_dt(value);
676 dev_err(dev, "%02x invalid decimation %d\n",
680 prop->decimation = ret;
682 prop->decimation = VADC_DEF_DECIMATION;
685 ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
687 ret = vadc_prescaling_from_dt(varr[0], varr[1]);
689 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
690 chan, varr[0], varr[1]);
693 prop->prescale = ret;
695 prop->prescale = vadc_chans[prop->channel].prescale_index;
698 ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
700 ret = vadc_hw_settle_time_from_dt(value);
702 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
706 prop->hw_settle_time = ret;
708 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
711 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
713 ret = vadc_avg_samples_from_dt(value);
715 dev_err(dev, "%02x invalid avg-samples %d\n",
719 prop->avg_samples = ret;
721 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
724 if (of_property_read_bool(node, "qcom,ratiometric"))
725 prop->calibration = VADC_CALIB_RATIOMETRIC;
727 prop->calibration = VADC_CALIB_ABSOLUTE;
729 dev_dbg(dev, "%02x name %s\n", chan, name);
734 static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
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;
743 vadc->nchannels = of_get_available_child_count(node);
744 if (!vadc->nchannels)
747 vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
748 sizeof(*vadc->iio_chans), GFP_KERNEL);
749 if (!vadc->iio_chans)
752 vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
753 sizeof(*vadc->chan_props), GFP_KERNEL);
754 if (!vadc->chan_props)
757 iio_chan = vadc->iio_chans;
759 for_each_available_child_of_node(node, child) {
760 ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
766 prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;
767 vadc->chan_props[index] = prop;
769 vadc_chan = &vadc_chans[prop.channel];
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++;
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");
787 if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
788 dev_err(vadc->dev, "Please define 0.625V channel\n");
792 if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
793 dev_err(vadc->dev, "Please define VDD channel\n");
797 if (!vadc_get_channel(vadc, VADC_GND_REF)) {
798 dev_err(vadc->dev, "Please define GND channel\n");
805 static irqreturn_t vadc_isr(int irq, void *dev_id)
807 struct vadc_priv *vadc = dev_id;
809 complete(&vadc->complete);
814 static int vadc_check_revision(struct vadc_priv *vadc)
819 ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
823 if (val < VADC_PERPH_TYPE_ADC) {
824 dev_err(vadc->dev, "%d is not ADC\n", val);
828 ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
832 if (val < VADC_PERPH_SUBTYPE_VADC) {
833 dev_err(vadc->dev, "%d is not VADC\n", val);
837 ret = vadc_read(vadc, VADC_REVISION2, &val);
841 if (val < VADC_REVISION2_SUPPORTED_VADC) {
842 dev_err(vadc->dev, "revision %d not supported\n", val);
849 static int vadc_probe(struct platform_device *pdev)
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;
859 regmap = dev_get_regmap(dev->parent, NULL);
863 ret = of_property_read_u32(node, "reg", ®);
867 indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
871 vadc = iio_priv(indio_dev);
872 vadc->regmap = regmap;
875 vadc->are_ref_measured = false;
876 init_completion(&vadc->complete);
877 mutex_init(&vadc->lock);
879 ret = vadc_check_revision(vadc);
883 ret = vadc_get_dt_data(vadc, node);
887 irq_eoc = platform_get_irq(pdev, 0);
889 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
891 vadc->poll_eoc = true;
893 ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
899 ret = vadc_reset(vadc);
901 dev_err(dev, "reset failed\n");
905 ret = vadc_measure_ref_points(vadc);
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;
915 return devm_iio_device_register(dev, indio_dev);
918 static const struct of_device_id vadc_match_table[] = {
919 { .compatible = "qcom,spmi-vadc" },
922 MODULE_DEVICE_TABLE(of, vadc_match_table);
924 static struct platform_driver vadc_driver = {
926 .name = "qcom-spmi-vadc",
927 .of_match_table = vadc_match_table,
931 module_platform_driver(vadc_driver);
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>");