1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2018, 2020, 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/log2.h>
15 #include <linux/math64.h>
16 #include <linux/module.h>
17 #include <linux/mod_devicetable.h>
18 #include <linux/platform_device.h>
19 #include <linux/property.h>
20 #include <linux/regmap.h>
21 #include <linux/slab.h>
22
23 #include <dt-bindings/iio/qcom,spmi-vadc.h>
24
25 #define ADC5_USR_REVISION1 0x0
26 #define ADC5_USR_STATUS1 0x8
27 #define ADC5_USR_STATUS1_CONV_FAULT BIT(7)
28 #define ADC5_USR_STATUS1_REQ_STS BIT(1)
29 #define ADC5_USR_STATUS1_EOC BIT(0)
30 #define ADC5_USR_STATUS1_REQ_STS_EOC_MASK 0x3
31
32 #define ADC5_USR_STATUS2 0x9
33 #define ADC5_USR_STATUS2_CONV_SEQ_MASK 0x70
34 #define ADC5_USR_STATUS2_CONV_SEQ_MASK_SHIFT 0x5
35
36 #define ADC5_USR_IBAT_MEAS 0xf
37 #define ADC5_USR_IBAT_MEAS_SUPPORTED BIT(0)
38
39 #define ADC5_USR_DIG_PARAM 0x42
40 #define ADC5_USR_DIG_PARAM_CAL_VAL BIT(6)
41 #define ADC5_USR_DIG_PARAM_CAL_VAL_SHIFT 6
42 #define ADC5_USR_DIG_PARAM_CAL_SEL 0x30
43 #define ADC5_USR_DIG_PARAM_CAL_SEL_SHIFT 4
44 #define ADC5_USR_DIG_PARAM_DEC_RATIO_SEL 0xc
45 #define ADC5_USR_DIG_PARAM_DEC_RATIO_SEL_SHIFT 2
46
47 #define ADC5_USR_FAST_AVG_CTL 0x43
48 #define ADC5_USR_FAST_AVG_CTL_EN BIT(7)
49 #define ADC5_USR_FAST_AVG_CTL_SAMPLES_MASK 0x7
50
51 #define ADC5_USR_CH_SEL_CTL 0x44
52
53 #define ADC5_USR_DELAY_CTL 0x45
54 #define ADC5_USR_HW_SETTLE_DELAY_MASK 0xf
55
56 #define ADC5_USR_EN_CTL1 0x46
57 #define ADC5_USR_EN_CTL1_ADC_EN BIT(7)
58
59 #define ADC5_USR_CONV_REQ 0x47
60 #define ADC5_USR_CONV_REQ_REQ BIT(7)
61
62 #define ADC5_USR_DATA0 0x50
63
64 #define ADC5_USR_DATA1 0x51
65
66 #define ADC5_USR_IBAT_DATA0 0x52
67
68 #define ADC5_USR_IBAT_DATA1 0x53
69
70 #define ADC_CHANNEL_OFFSET 0x8
71 #define ADC_CHANNEL_MASK GENMASK(7, 0)
72
73 /*
74 * Conversion time varies based on the decimation, clock rate, fast average
75 * samples and measurements queued across different VADC peripherals.
76 * Set the timeout to a max of 100ms.
77 */
78 #define ADC5_CONV_TIME_MIN_US 263
79 #define ADC5_CONV_TIME_MAX_US 264
80 #define ADC5_CONV_TIME_RETRY 400
81 #define ADC5_CONV_TIMEOUT msecs_to_jiffies(100)
82
83 /* Digital version >= 5.3 supports hw_settle_2 */
84 #define ADC5_HW_SETTLE_DIFF_MINOR 3
85 #define ADC5_HW_SETTLE_DIFF_MAJOR 5
86
87 /* For PMIC7 */
88 #define ADC_APP_SID 0x40
89 #define ADC_APP_SID_MASK GENMASK(3, 0)
90 #define ADC7_CONV_TIMEOUT msecs_to_jiffies(10)
91
92 enum adc5_cal_method {
93 ADC5_NO_CAL = 0,
94 ADC5_RATIOMETRIC_CAL,
95 ADC5_ABSOLUTE_CAL
96 };
97
98 enum adc5_cal_val {
99 ADC5_TIMER_CAL = 0,
100 ADC5_NEW_CAL
101 };
102
103 /**
104 * struct adc5_channel_prop - ADC channel property.
105 * @channel: channel number, refer to the channel list.
106 * @cal_method: calibration method.
107 * @cal_val: calibration value
108 * @decimation: sampling rate supported for the channel.
109 * @sid: slave id of PMIC owning the channel, for PMIC7.
110 * @prescale: channel scaling performed on the input signal.
111 * @hw_settle_time: the time between AMUX being configured and the
112 * start of conversion.
113 * @avg_samples: ability to provide single result from the ADC
114 * that is an average of multiple measurements.
115 * @scale_fn_type: Represents the scaling function to convert voltage
116 * physical units desired by the client for the channel.
117 * @channel_name: Channel name used in device tree.
118 */
119 struct adc5_channel_prop {
120 unsigned int channel;
121 enum adc5_cal_method cal_method;
122 enum adc5_cal_val cal_val;
123 unsigned int decimation;
124 unsigned int sid;
125 unsigned int prescale;
126 unsigned int hw_settle_time;
127 unsigned int avg_samples;
128 enum vadc_scale_fn_type scale_fn_type;
129 const char *channel_name;
130 };
131
132 /**
133 * struct adc5_chip - ADC private structure.
134 * @regmap: SPMI ADC5 peripheral register map field.
135 * @dev: SPMI ADC5 device.
136 * @base: base address for the ADC peripheral.
137 * @nchannels: number of ADC channels.
138 * @chan_props: array of ADC channel properties.
139 * @iio_chans: array of IIO channels specification.
140 * @poll_eoc: use polling instead of interrupt.
141 * @complete: ADC result notification after interrupt is received.
142 * @lock: ADC lock for access to the peripheral.
143 * @data: software configuration data.
144 */
145 struct adc5_chip {
146 struct regmap *regmap;
147 struct device *dev;
148 u16 base;
149 unsigned int nchannels;
150 struct adc5_channel_prop *chan_props;
151 struct iio_chan_spec *iio_chans;
152 bool poll_eoc;
153 struct completion complete;
154 struct mutex lock;
155 const struct adc5_data *data;
156 };
157
adc5_read(struct adc5_chip * adc,u16 offset,u8 * data,int len)158 static int adc5_read(struct adc5_chip *adc, u16 offset, u8 *data, int len)
159 {
160 return regmap_bulk_read(adc->regmap, adc->base + offset, data, len);
161 }
162
adc5_write(struct adc5_chip * adc,u16 offset,u8 * data,int len)163 static int adc5_write(struct adc5_chip *adc, u16 offset, u8 *data, int len)
164 {
165 return regmap_bulk_write(adc->regmap, adc->base + offset, data, len);
166 }
167
adc5_masked_write(struct adc5_chip * adc,u16 offset,u8 mask,u8 val)168 static int adc5_masked_write(struct adc5_chip *adc, u16 offset, u8 mask, u8 val)
169 {
170 return regmap_update_bits(adc->regmap, adc->base + offset, mask, val);
171 }
172
adc5_read_voltage_data(struct adc5_chip * adc,u16 * data)173 static int adc5_read_voltage_data(struct adc5_chip *adc, u16 *data)
174 {
175 int ret;
176 u8 rslt_lsb, rslt_msb;
177
178 ret = adc5_read(adc, ADC5_USR_DATA0, &rslt_lsb, sizeof(rslt_lsb));
179 if (ret)
180 return ret;
181
182 ret = adc5_read(adc, ADC5_USR_DATA1, &rslt_msb, sizeof(rslt_lsb));
183 if (ret)
184 return ret;
185
186 *data = (rslt_msb << 8) | rslt_lsb;
187
188 if (*data == ADC5_USR_DATA_CHECK) {
189 dev_err(adc->dev, "Invalid data:0x%x\n", *data);
190 return -EINVAL;
191 }
192
193 dev_dbg(adc->dev, "voltage raw code:0x%x\n", *data);
194
195 return 0;
196 }
197
adc5_poll_wait_eoc(struct adc5_chip * adc)198 static int adc5_poll_wait_eoc(struct adc5_chip *adc)
199 {
200 unsigned int count, retry = ADC5_CONV_TIME_RETRY;
201 u8 status1;
202 int ret;
203
204 for (count = 0; count < retry; count++) {
205 ret = adc5_read(adc, ADC5_USR_STATUS1, &status1,
206 sizeof(status1));
207 if (ret)
208 return ret;
209
210 status1 &= ADC5_USR_STATUS1_REQ_STS_EOC_MASK;
211 if (status1 == ADC5_USR_STATUS1_EOC)
212 return 0;
213
214 usleep_range(ADC5_CONV_TIME_MIN_US, ADC5_CONV_TIME_MAX_US);
215 }
216
217 return -ETIMEDOUT;
218 }
219
adc5_update_dig_param(struct adc5_chip * adc,struct adc5_channel_prop * prop,u8 * data)220 static void adc5_update_dig_param(struct adc5_chip *adc,
221 struct adc5_channel_prop *prop, u8 *data)
222 {
223 /* Update calibration value */
224 *data &= ~ADC5_USR_DIG_PARAM_CAL_VAL;
225 *data |= (prop->cal_val << ADC5_USR_DIG_PARAM_CAL_VAL_SHIFT);
226
227 /* Update calibration select */
228 *data &= ~ADC5_USR_DIG_PARAM_CAL_SEL;
229 *data |= (prop->cal_method << ADC5_USR_DIG_PARAM_CAL_SEL_SHIFT);
230
231 /* Update decimation ratio select */
232 *data &= ~ADC5_USR_DIG_PARAM_DEC_RATIO_SEL;
233 *data |= (prop->decimation << ADC5_USR_DIG_PARAM_DEC_RATIO_SEL_SHIFT);
234 }
235
adc5_configure(struct adc5_chip * adc,struct adc5_channel_prop * prop)236 static int adc5_configure(struct adc5_chip *adc,
237 struct adc5_channel_prop *prop)
238 {
239 int ret;
240 u8 buf[6];
241
242 /* Read registers 0x42 through 0x46 */
243 ret = adc5_read(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
244 if (ret)
245 return ret;
246
247 /* Digital param selection */
248 adc5_update_dig_param(adc, prop, &buf[0]);
249
250 /* Update fast average sample value */
251 buf[1] &= (u8) ~ADC5_USR_FAST_AVG_CTL_SAMPLES_MASK;
252 buf[1] |= prop->avg_samples;
253
254 /* Select ADC channel */
255 buf[2] = prop->channel;
256
257 /* Select HW settle delay for channel */
258 buf[3] &= (u8) ~ADC5_USR_HW_SETTLE_DELAY_MASK;
259 buf[3] |= prop->hw_settle_time;
260
261 /* Select ADC enable */
262 buf[4] |= ADC5_USR_EN_CTL1_ADC_EN;
263
264 /* Select CONV request */
265 buf[5] |= ADC5_USR_CONV_REQ_REQ;
266
267 if (!adc->poll_eoc)
268 reinit_completion(&adc->complete);
269
270 return adc5_write(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
271 }
272
adc7_configure(struct adc5_chip * adc,struct adc5_channel_prop * prop)273 static int adc7_configure(struct adc5_chip *adc,
274 struct adc5_channel_prop *prop)
275 {
276 int ret;
277 u8 conv_req = 0, buf[4];
278
279 ret = adc5_masked_write(adc, ADC_APP_SID, ADC_APP_SID_MASK, prop->sid);
280 if (ret)
281 return ret;
282
283 ret = adc5_read(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
284 if (ret)
285 return ret;
286
287 /* Digital param selection */
288 adc5_update_dig_param(adc, prop, &buf[0]);
289
290 /* Update fast average sample value */
291 buf[1] &= ~ADC5_USR_FAST_AVG_CTL_SAMPLES_MASK;
292 buf[1] |= prop->avg_samples;
293
294 /* Select ADC channel */
295 buf[2] = prop->channel;
296
297 /* Select HW settle delay for channel */
298 buf[3] &= ~ADC5_USR_HW_SETTLE_DELAY_MASK;
299 buf[3] |= prop->hw_settle_time;
300
301 /* Select CONV request */
302 conv_req = ADC5_USR_CONV_REQ_REQ;
303
304 if (!adc->poll_eoc)
305 reinit_completion(&adc->complete);
306
307 ret = adc5_write(adc, ADC5_USR_DIG_PARAM, buf, sizeof(buf));
308 if (ret)
309 return ret;
310
311 return adc5_write(adc, ADC5_USR_CONV_REQ, &conv_req, 1);
312 }
313
adc5_do_conversion(struct adc5_chip * adc,struct adc5_channel_prop * prop,struct iio_chan_spec const * chan,u16 * data_volt,u16 * data_cur)314 static int adc5_do_conversion(struct adc5_chip *adc,
315 struct adc5_channel_prop *prop,
316 struct iio_chan_spec const *chan,
317 u16 *data_volt, u16 *data_cur)
318 {
319 int ret;
320
321 mutex_lock(&adc->lock);
322
323 ret = adc5_configure(adc, prop);
324 if (ret) {
325 dev_err(adc->dev, "ADC configure failed with %d\n", ret);
326 goto unlock;
327 }
328
329 if (adc->poll_eoc) {
330 ret = adc5_poll_wait_eoc(adc);
331 if (ret) {
332 dev_err(adc->dev, "EOC bit not set\n");
333 goto unlock;
334 }
335 } else {
336 ret = wait_for_completion_timeout(&adc->complete,
337 ADC5_CONV_TIMEOUT);
338 if (!ret) {
339 dev_dbg(adc->dev, "Did not get completion timeout.\n");
340 ret = adc5_poll_wait_eoc(adc);
341 if (ret) {
342 dev_err(adc->dev, "EOC bit not set\n");
343 goto unlock;
344 }
345 }
346 }
347
348 ret = adc5_read_voltage_data(adc, data_volt);
349 unlock:
350 mutex_unlock(&adc->lock);
351
352 return ret;
353 }
354
adc7_do_conversion(struct adc5_chip * adc,struct adc5_channel_prop * prop,struct iio_chan_spec const * chan,u16 * data_volt,u16 * data_cur)355 static int adc7_do_conversion(struct adc5_chip *adc,
356 struct adc5_channel_prop *prop,
357 struct iio_chan_spec const *chan,
358 u16 *data_volt, u16 *data_cur)
359 {
360 int ret;
361 u8 status;
362
363 mutex_lock(&adc->lock);
364
365 ret = adc7_configure(adc, prop);
366 if (ret) {
367 dev_err(adc->dev, "ADC configure failed with %d\n", ret);
368 goto unlock;
369 }
370
371 /* No support for polling mode at present */
372 wait_for_completion_timeout(&adc->complete, ADC7_CONV_TIMEOUT);
373
374 ret = adc5_read(adc, ADC5_USR_STATUS1, &status, 1);
375 if (ret)
376 goto unlock;
377
378 if (status & ADC5_USR_STATUS1_CONV_FAULT) {
379 dev_err(adc->dev, "Unexpected conversion fault\n");
380 ret = -EIO;
381 goto unlock;
382 }
383
384 ret = adc5_read_voltage_data(adc, data_volt);
385
386 unlock:
387 mutex_unlock(&adc->lock);
388
389 return ret;
390 }
391
392 typedef int (*adc_do_conversion)(struct adc5_chip *adc,
393 struct adc5_channel_prop *prop,
394 struct iio_chan_spec const *chan,
395 u16 *data_volt, u16 *data_cur);
396
adc5_isr(int irq,void * dev_id)397 static irqreturn_t adc5_isr(int irq, void *dev_id)
398 {
399 struct adc5_chip *adc = dev_id;
400
401 complete(&adc->complete);
402
403 return IRQ_HANDLED;
404 }
405
adc5_fwnode_xlate(struct iio_dev * indio_dev,const struct fwnode_reference_args * iiospec)406 static int adc5_fwnode_xlate(struct iio_dev *indio_dev,
407 const struct fwnode_reference_args *iiospec)
408 {
409 struct adc5_chip *adc = iio_priv(indio_dev);
410 int i;
411
412 for (i = 0; i < adc->nchannels; i++)
413 if (adc->chan_props[i].channel == iiospec->args[0])
414 return i;
415
416 return -EINVAL;
417 }
418
adc7_fwnode_xlate(struct iio_dev * indio_dev,const struct fwnode_reference_args * iiospec)419 static int adc7_fwnode_xlate(struct iio_dev *indio_dev,
420 const struct fwnode_reference_args *iiospec)
421 {
422 struct adc5_chip *adc = iio_priv(indio_dev);
423 int i, v_channel;
424
425 for (i = 0; i < adc->nchannels; i++) {
426 v_channel = (adc->chan_props[i].sid << ADC_CHANNEL_OFFSET) |
427 adc->chan_props[i].channel;
428 if (v_channel == iiospec->args[0])
429 return i;
430 }
431
432 return -EINVAL;
433 }
434
adc_read_raw_common(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask,adc_do_conversion do_conv)435 static int adc_read_raw_common(struct iio_dev *indio_dev,
436 struct iio_chan_spec const *chan, int *val, int *val2,
437 long mask, adc_do_conversion do_conv)
438 {
439 struct adc5_chip *adc = iio_priv(indio_dev);
440 struct adc5_channel_prop *prop;
441 u16 adc_code_volt, adc_code_cur;
442 int ret;
443
444 prop = &adc->chan_props[chan->address];
445
446 switch (mask) {
447 case IIO_CHAN_INFO_PROCESSED:
448 ret = do_conv(adc, prop, chan,
449 &adc_code_volt, &adc_code_cur);
450 if (ret)
451 return ret;
452
453 ret = qcom_adc5_hw_scale(prop->scale_fn_type,
454 prop->prescale,
455 adc->data,
456 adc_code_volt, val);
457 if (ret)
458 return ret;
459
460 return IIO_VAL_INT;
461 default:
462 return -EINVAL;
463 }
464 }
465
adc5_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)466 static int adc5_read_raw(struct iio_dev *indio_dev,
467 struct iio_chan_spec const *chan, int *val, int *val2,
468 long mask)
469 {
470 return adc_read_raw_common(indio_dev, chan, val, val2,
471 mask, adc5_do_conversion);
472 }
473
adc7_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)474 static int adc7_read_raw(struct iio_dev *indio_dev,
475 struct iio_chan_spec const *chan, int *val, int *val2,
476 long mask)
477 {
478 return adc_read_raw_common(indio_dev, chan, val, val2,
479 mask, adc7_do_conversion);
480 }
481
482 static const struct iio_info adc5_info = {
483 .read_raw = adc5_read_raw,
484 .fwnode_xlate = adc5_fwnode_xlate,
485 };
486
487 static const struct iio_info adc7_info = {
488 .read_raw = adc7_read_raw,
489 .fwnode_xlate = adc7_fwnode_xlate,
490 };
491
492 struct adc5_channels {
493 const char *datasheet_name;
494 unsigned int prescale_index;
495 enum iio_chan_type type;
496 long info_mask;
497 enum vadc_scale_fn_type scale_fn_type;
498 };
499
500 /* In these definitions, _pre refers to an index into adc5_prescale_ratios. */
501 #define ADC5_CHAN(_dname, _type, _mask, _pre, _scale) \
502 { \
503 .datasheet_name = _dname, \
504 .prescale_index = _pre, \
505 .type = _type, \
506 .info_mask = _mask, \
507 .scale_fn_type = _scale, \
508 }, \
509
510 #define ADC5_CHAN_TEMP(_dname, _pre, _scale) \
511 ADC5_CHAN(_dname, IIO_TEMP, \
512 BIT(IIO_CHAN_INFO_PROCESSED), \
513 _pre, _scale) \
514
515 #define ADC5_CHAN_VOLT(_dname, _pre, _scale) \
516 ADC5_CHAN(_dname, IIO_VOLTAGE, \
517 BIT(IIO_CHAN_INFO_PROCESSED), \
518 _pre, _scale) \
519
520 static const struct adc5_channels adc5_chans_pmic[ADC5_MAX_CHANNEL] = {
521 [ADC5_REF_GND] = ADC5_CHAN_VOLT("ref_gnd", 0,
522 SCALE_HW_CALIB_DEFAULT)
523 [ADC5_1P25VREF] = ADC5_CHAN_VOLT("vref_1p25", 0,
524 SCALE_HW_CALIB_DEFAULT)
525 [ADC5_VPH_PWR] = ADC5_CHAN_VOLT("vph_pwr", 1,
526 SCALE_HW_CALIB_DEFAULT)
527 [ADC5_VBAT_SNS] = ADC5_CHAN_VOLT("vbat_sns", 1,
528 SCALE_HW_CALIB_DEFAULT)
529 [ADC5_VCOIN] = ADC5_CHAN_VOLT("vcoin", 1,
530 SCALE_HW_CALIB_DEFAULT)
531 [ADC5_DIE_TEMP] = ADC5_CHAN_TEMP("die_temp", 0,
532 SCALE_HW_CALIB_PMIC_THERM)
533 [ADC5_USB_IN_I] = ADC5_CHAN_VOLT("usb_in_i_uv", 0,
534 SCALE_HW_CALIB_DEFAULT)
535 [ADC5_USB_IN_V_16] = ADC5_CHAN_VOLT("usb_in_v_div_16", 8,
536 SCALE_HW_CALIB_DEFAULT)
537 [ADC5_CHG_TEMP] = ADC5_CHAN_TEMP("chg_temp", 0,
538 SCALE_HW_CALIB_PM5_CHG_TEMP)
539 /* Charger prescales SBUx and MID_CHG to fit within 1.8V upper unit */
540 [ADC5_SBUx] = ADC5_CHAN_VOLT("chg_sbux", 1,
541 SCALE_HW_CALIB_DEFAULT)
542 [ADC5_MID_CHG_DIV6] = ADC5_CHAN_VOLT("chg_mid_chg", 3,
543 SCALE_HW_CALIB_DEFAULT)
544 [ADC5_XO_THERM_100K_PU] = ADC5_CHAN_TEMP("xo_therm", 0,
545 SCALE_HW_CALIB_XOTHERM)
546 [ADC5_BAT_ID_100K_PU] = ADC5_CHAN_TEMP("bat_id", 0,
547 SCALE_HW_CALIB_DEFAULT)
548 [ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 0,
549 SCALE_HW_CALIB_THERM_100K_PULLUP)
550 [ADC5_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_100k_pu", 0,
551 SCALE_HW_CALIB_THERM_100K_PULLUP)
552 [ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 0,
553 SCALE_HW_CALIB_THERM_100K_PULLUP)
554 [ADC5_AMUX_THM2] = ADC5_CHAN_TEMP("amux_thm2", 0,
555 SCALE_HW_CALIB_PM5_SMB_TEMP)
556 [ADC5_GPIO1_100K_PU] = ADC5_CHAN_TEMP("gpio1_100k_pu", 0,
557 SCALE_HW_CALIB_THERM_100K_PULLUP)
558 [ADC5_GPIO2_100K_PU] = ADC5_CHAN_TEMP("gpio2_100k_pu", 0,
559 SCALE_HW_CALIB_THERM_100K_PULLUP)
560 [ADC5_GPIO3_100K_PU] = ADC5_CHAN_TEMP("gpio3_100k_pu", 0,
561 SCALE_HW_CALIB_THERM_100K_PULLUP)
562 [ADC5_GPIO4_100K_PU] = ADC5_CHAN_TEMP("gpio4_100k_pu", 0,
563 SCALE_HW_CALIB_THERM_100K_PULLUP)
564 };
565
566 static const struct adc5_channels adc7_chans_pmic[ADC5_MAX_CHANNEL] = {
567 [ADC7_REF_GND] = ADC5_CHAN_VOLT("ref_gnd", 0,
568 SCALE_HW_CALIB_DEFAULT)
569 [ADC7_1P25VREF] = ADC5_CHAN_VOLT("vref_1p25", 0,
570 SCALE_HW_CALIB_DEFAULT)
571 [ADC7_VPH_PWR] = ADC5_CHAN_VOLT("vph_pwr", 1,
572 SCALE_HW_CALIB_DEFAULT)
573 [ADC7_VBAT_SNS] = ADC5_CHAN_VOLT("vbat_sns", 3,
574 SCALE_HW_CALIB_DEFAULT)
575 [ADC7_DIE_TEMP] = ADC5_CHAN_TEMP("die_temp", 0,
576 SCALE_HW_CALIB_PMIC_THERM_PM7)
577 [ADC7_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_pu2", 0,
578 SCALE_HW_CALIB_THERM_100K_PU_PM7)
579 [ADC7_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_pu2", 0,
580 SCALE_HW_CALIB_THERM_100K_PU_PM7)
581 [ADC7_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_pu2", 0,
582 SCALE_HW_CALIB_THERM_100K_PU_PM7)
583 [ADC7_AMUX_THM4_100K_PU] = ADC5_CHAN_TEMP("amux_thm4_pu2", 0,
584 SCALE_HW_CALIB_THERM_100K_PU_PM7)
585 [ADC7_AMUX_THM5_100K_PU] = ADC5_CHAN_TEMP("amux_thm5_pu2", 0,
586 SCALE_HW_CALIB_THERM_100K_PU_PM7)
587 [ADC7_AMUX_THM6_100K_PU] = ADC5_CHAN_TEMP("amux_thm6_pu2", 0,
588 SCALE_HW_CALIB_THERM_100K_PU_PM7)
589 [ADC7_GPIO1_100K_PU] = ADC5_CHAN_TEMP("gpio1_pu2", 0,
590 SCALE_HW_CALIB_THERM_100K_PU_PM7)
591 [ADC7_GPIO2_100K_PU] = ADC5_CHAN_TEMP("gpio2_pu2", 0,
592 SCALE_HW_CALIB_THERM_100K_PU_PM7)
593 [ADC7_GPIO3_100K_PU] = ADC5_CHAN_TEMP("gpio3_pu2", 0,
594 SCALE_HW_CALIB_THERM_100K_PU_PM7)
595 [ADC7_GPIO4_100K_PU] = ADC5_CHAN_TEMP("gpio4_pu2", 0,
596 SCALE_HW_CALIB_THERM_100K_PU_PM7)
597 };
598
599 static const struct adc5_channels adc5_chans_rev2[ADC5_MAX_CHANNEL] = {
600 [ADC5_REF_GND] = ADC5_CHAN_VOLT("ref_gnd", 0,
601 SCALE_HW_CALIB_DEFAULT)
602 [ADC5_1P25VREF] = ADC5_CHAN_VOLT("vref_1p25", 0,
603 SCALE_HW_CALIB_DEFAULT)
604 [ADC5_VREF_VADC] = ADC5_CHAN_VOLT("vref_vadc", 0,
605 SCALE_HW_CALIB_DEFAULT)
606 [ADC5_VPH_PWR] = ADC5_CHAN_VOLT("vph_pwr", 1,
607 SCALE_HW_CALIB_DEFAULT)
608 [ADC5_VBAT_SNS] = ADC5_CHAN_VOLT("vbat_sns", 1,
609 SCALE_HW_CALIB_DEFAULT)
610 [ADC5_VCOIN] = ADC5_CHAN_VOLT("vcoin", 1,
611 SCALE_HW_CALIB_DEFAULT)
612 [ADC5_DIE_TEMP] = ADC5_CHAN_TEMP("die_temp", 0,
613 SCALE_HW_CALIB_PMIC_THERM)
614 [ADC5_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_100k_pu", 0,
615 SCALE_HW_CALIB_THERM_100K_PULLUP)
616 [ADC5_AMUX_THM2_100K_PU] = ADC5_CHAN_TEMP("amux_thm2_100k_pu", 0,
617 SCALE_HW_CALIB_THERM_100K_PULLUP)
618 [ADC5_AMUX_THM3_100K_PU] = ADC5_CHAN_TEMP("amux_thm3_100k_pu", 0,
619 SCALE_HW_CALIB_THERM_100K_PULLUP)
620 [ADC5_AMUX_THM4_100K_PU] = ADC5_CHAN_TEMP("amux_thm4_100k_pu", 0,
621 SCALE_HW_CALIB_THERM_100K_PULLUP)
622 [ADC5_AMUX_THM5_100K_PU] = ADC5_CHAN_TEMP("amux_thm5_100k_pu", 0,
623 SCALE_HW_CALIB_THERM_100K_PULLUP)
624 [ADC5_XO_THERM_100K_PU] = ADC5_CHAN_TEMP("xo_therm_100k_pu", 0,
625 SCALE_HW_CALIB_THERM_100K_PULLUP)
626 };
627
adc5_get_fw_channel_data(struct adc5_chip * adc,struct adc5_channel_prop * prop,struct fwnode_handle * fwnode,const struct adc5_data * data)628 static int adc5_get_fw_channel_data(struct adc5_chip *adc,
629 struct adc5_channel_prop *prop,
630 struct fwnode_handle *fwnode,
631 const struct adc5_data *data)
632 {
633 const char *channel_name;
634 char *name;
635 u32 chan, value, varr[2];
636 u32 sid = 0;
637 int ret;
638 struct device *dev = adc->dev;
639
640 name = devm_kasprintf(dev, GFP_KERNEL, "%pfwP", fwnode);
641 if (!name)
642 return -ENOMEM;
643
644 /* Cut the address part */
645 name[strchrnul(name, '@') - name] = '\0';
646
647 ret = fwnode_property_read_u32(fwnode, "reg", &chan);
648 if (ret) {
649 dev_err(dev, "invalid channel number %s\n", name);
650 return ret;
651 }
652
653 /* Value read from "reg" is virtual channel number */
654
655 /* virtual channel number = sid << 8 | channel number */
656
657 if (adc->data->info == &adc7_info) {
658 sid = chan >> ADC_CHANNEL_OFFSET;
659 chan = chan & ADC_CHANNEL_MASK;
660 }
661
662 if (chan > ADC5_PARALLEL_ISENSE_VBAT_IDATA) {
663 dev_err(dev, "%s invalid channel number %d\n", name, chan);
664 return -EINVAL;
665 }
666
667 /* the channel has DT description */
668 prop->channel = chan;
669 prop->sid = sid;
670
671 ret = fwnode_property_read_string(fwnode, "label", &channel_name);
672 if (ret)
673 channel_name = data->adc_chans[chan].datasheet_name;
674
675 prop->channel_name = channel_name;
676
677 ret = fwnode_property_read_u32(fwnode, "qcom,decimation", &value);
678 if (!ret) {
679 ret = qcom_adc5_decimation_from_dt(value, data->decimation);
680 if (ret < 0) {
681 dev_err(dev, "%02x invalid decimation %d\n",
682 chan, value);
683 return ret;
684 }
685 prop->decimation = ret;
686 } else {
687 prop->decimation = ADC5_DECIMATION_DEFAULT;
688 }
689
690 ret = fwnode_property_read_u32_array(fwnode, "qcom,pre-scaling", varr, 2);
691 if (!ret) {
692 ret = qcom_adc5_prescaling_from_dt(varr[0], varr[1]);
693 if (ret < 0) {
694 dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
695 chan, varr[0], varr[1]);
696 return ret;
697 }
698 prop->prescale = ret;
699 } else {
700 prop->prescale =
701 adc->data->adc_chans[prop->channel].prescale_index;
702 }
703
704 ret = fwnode_property_read_u32(fwnode, "qcom,hw-settle-time", &value);
705 if (!ret) {
706 u8 dig_version[2];
707
708 ret = adc5_read(adc, ADC5_USR_REVISION1, dig_version,
709 sizeof(dig_version));
710 if (ret) {
711 dev_err(dev, "Invalid dig version read %d\n", ret);
712 return ret;
713 }
714
715 dev_dbg(dev, "dig_ver:minor:%d, major:%d\n", dig_version[0],
716 dig_version[1]);
717 /* Digital controller >= 5.3 have hw_settle_2 option */
718 if ((dig_version[0] >= ADC5_HW_SETTLE_DIFF_MINOR &&
719 dig_version[1] >= ADC5_HW_SETTLE_DIFF_MAJOR) ||
720 adc->data->info == &adc7_info)
721 ret = qcom_adc5_hw_settle_time_from_dt(value, data->hw_settle_2);
722 else
723 ret = qcom_adc5_hw_settle_time_from_dt(value, data->hw_settle_1);
724
725 if (ret < 0) {
726 dev_err(dev, "%02x invalid hw-settle-time %d us\n",
727 chan, value);
728 return ret;
729 }
730 prop->hw_settle_time = ret;
731 } else {
732 prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
733 }
734
735 ret = fwnode_property_read_u32(fwnode, "qcom,avg-samples", &value);
736 if (!ret) {
737 ret = qcom_adc5_avg_samples_from_dt(value);
738 if (ret < 0) {
739 dev_err(dev, "%02x invalid avg-samples %d\n",
740 chan, value);
741 return ret;
742 }
743 prop->avg_samples = ret;
744 } else {
745 prop->avg_samples = VADC_DEF_AVG_SAMPLES;
746 }
747
748 if (fwnode_property_read_bool(fwnode, "qcom,ratiometric"))
749 prop->cal_method = ADC5_RATIOMETRIC_CAL;
750 else
751 prop->cal_method = ADC5_ABSOLUTE_CAL;
752
753 /*
754 * Default to using timer calibration. Using a fresh calibration value
755 * for every conversion will increase the overall time for a request.
756 */
757 prop->cal_val = ADC5_TIMER_CAL;
758
759 dev_dbg(dev, "%02x name %s\n", chan, name);
760
761 return 0;
762 }
763
764 static const struct adc5_data adc5_data_pmic = {
765 .full_scale_code_volt = 0x70e4,
766 .full_scale_code_cur = 0x2710,
767 .adc_chans = adc5_chans_pmic,
768 .info = &adc5_info,
769 .decimation = (unsigned int [ADC5_DECIMATION_SAMPLES_MAX])
770 {250, 420, 840},
771 .hw_settle_1 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
772 {15, 100, 200, 300, 400, 500, 600, 700,
773 800, 900, 1, 2, 4, 6, 8, 10},
774 .hw_settle_2 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
775 {15, 100, 200, 300, 400, 500, 600, 700,
776 1, 2, 4, 8, 16, 32, 64, 128},
777 };
778
779 static const struct adc5_data adc7_data_pmic = {
780 .full_scale_code_volt = 0x70e4,
781 .adc_chans = adc7_chans_pmic,
782 .info = &adc7_info,
783 .decimation = (unsigned int [ADC5_DECIMATION_SAMPLES_MAX])
784 {85, 340, 1360},
785 .hw_settle_2 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
786 {15, 100, 200, 300, 400, 500, 600, 700,
787 1000, 2000, 4000, 8000, 16000, 32000,
788 64000, 128000},
789 };
790
791 static const struct adc5_data adc5_data_pmic_rev2 = {
792 .full_scale_code_volt = 0x4000,
793 .full_scale_code_cur = 0x1800,
794 .adc_chans = adc5_chans_rev2,
795 .info = &adc5_info,
796 .decimation = (unsigned int [ADC5_DECIMATION_SAMPLES_MAX])
797 {256, 512, 1024},
798 .hw_settle_1 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
799 {0, 100, 200, 300, 400, 500, 600, 700,
800 800, 900, 1, 2, 4, 6, 8, 10},
801 .hw_settle_2 = (unsigned int [VADC_HW_SETTLE_SAMPLES_MAX])
802 {15, 100, 200, 300, 400, 500, 600, 700,
803 1, 2, 4, 8, 16, 32, 64, 128},
804 };
805
806 static const struct of_device_id adc5_match_table[] = {
807 {
808 .compatible = "qcom,spmi-adc5",
809 .data = &adc5_data_pmic,
810 },
811 {
812 .compatible = "qcom,spmi-adc7",
813 .data = &adc7_data_pmic,
814 },
815 {
816 .compatible = "qcom,spmi-adc-rev2",
817 .data = &adc5_data_pmic_rev2,
818 },
819 { }
820 };
821 MODULE_DEVICE_TABLE(of, adc5_match_table);
822
adc5_get_fw_data(struct adc5_chip * adc)823 static int adc5_get_fw_data(struct adc5_chip *adc)
824 {
825 const struct adc5_channels *adc_chan;
826 struct iio_chan_spec *iio_chan;
827 struct adc5_channel_prop prop, *chan_props;
828 struct fwnode_handle *child;
829 unsigned int index = 0;
830 int ret;
831
832 adc->nchannels = device_get_child_node_count(adc->dev);
833 if (!adc->nchannels)
834 return -EINVAL;
835
836 adc->iio_chans = devm_kcalloc(adc->dev, adc->nchannels,
837 sizeof(*adc->iio_chans), GFP_KERNEL);
838 if (!adc->iio_chans)
839 return -ENOMEM;
840
841 adc->chan_props = devm_kcalloc(adc->dev, adc->nchannels,
842 sizeof(*adc->chan_props), GFP_KERNEL);
843 if (!adc->chan_props)
844 return -ENOMEM;
845
846 chan_props = adc->chan_props;
847 iio_chan = adc->iio_chans;
848 adc->data = device_get_match_data(adc->dev);
849 if (!adc->data)
850 adc->data = &adc5_data_pmic;
851
852 device_for_each_child_node(adc->dev, child) {
853 ret = adc5_get_fw_channel_data(adc, &prop, child, adc->data);
854 if (ret) {
855 fwnode_handle_put(child);
856 return ret;
857 }
858
859 prop.scale_fn_type =
860 adc->data->adc_chans[prop.channel].scale_fn_type;
861 *chan_props = prop;
862 adc_chan = &adc->data->adc_chans[prop.channel];
863
864 iio_chan->channel = prop.channel;
865 iio_chan->datasheet_name = adc_chan->datasheet_name;
866 iio_chan->extend_name = prop.channel_name;
867 iio_chan->info_mask_separate = adc_chan->info_mask;
868 iio_chan->type = adc_chan->type;
869 iio_chan->address = index;
870 iio_chan++;
871 chan_props++;
872 index++;
873 }
874
875 return 0;
876 }
877
adc5_probe(struct platform_device * pdev)878 static int adc5_probe(struct platform_device *pdev)
879 {
880 struct device *dev = &pdev->dev;
881 struct iio_dev *indio_dev;
882 struct adc5_chip *adc;
883 struct regmap *regmap;
884 int ret, irq_eoc;
885 u32 reg;
886
887 regmap = dev_get_regmap(dev->parent, NULL);
888 if (!regmap)
889 return -ENODEV;
890
891 ret = device_property_read_u32(dev, "reg", ®);
892 if (ret < 0)
893 return ret;
894
895 indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
896 if (!indio_dev)
897 return -ENOMEM;
898
899 adc = iio_priv(indio_dev);
900 adc->regmap = regmap;
901 adc->dev = dev;
902 adc->base = reg;
903
904 init_completion(&adc->complete);
905 mutex_init(&adc->lock);
906
907 ret = adc5_get_fw_data(adc);
908 if (ret)
909 return dev_err_probe(dev, ret, "adc get dt data failed\n");
910
911 irq_eoc = platform_get_irq(pdev, 0);
912 if (irq_eoc < 0) {
913 if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
914 return irq_eoc;
915 adc->poll_eoc = true;
916 } else {
917 ret = devm_request_irq(dev, irq_eoc, adc5_isr, 0,
918 "pm-adc5", adc);
919 if (ret)
920 return ret;
921 }
922
923 indio_dev->name = pdev->name;
924 indio_dev->modes = INDIO_DIRECT_MODE;
925 indio_dev->info = adc->data->info;
926 indio_dev->channels = adc->iio_chans;
927 indio_dev->num_channels = adc->nchannels;
928
929 return devm_iio_device_register(dev, indio_dev);
930 }
931
932 static struct platform_driver adc5_driver = {
933 .driver = {
934 .name = "qcom-spmi-adc5",
935 .of_match_table = adc5_match_table,
936 },
937 .probe = adc5_probe,
938 };
939 module_platform_driver(adc5_driver);
940
941 MODULE_ALIAS("platform:qcom-spmi-adc5");
942 MODULE_DESCRIPTION("Qualcomm Technologies Inc. PMIC5 ADC driver");
943 MODULE_LICENSE("GPL v2");
944