1 // SPDX-License-Identifier: GPL-2.0-only
2 /* ADC driver for AXP20X and AXP22X PMICs
3 *
4 * Copyright (c) 2016 Free Electrons NextThing Co.
5 * Quentin Schulz <quentin.schulz@free-electrons.com>
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/completion.h>
10 #include <linux/interrupt.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/property.h>
17 #include <linux/regmap.h>
18 #include <linux/thermal.h>
19
20 #include <linux/iio/iio.h>
21 #include <linux/iio/driver.h>
22 #include <linux/iio/machine.h>
23 #include <linux/mfd/axp20x.h>
24
25 #define AXP20X_ADC_EN1_MASK GENMASK(7, 0)
26 #define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7))
27
28 #define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0))
29
30 #define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0)
31 #define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1)
32
33 #define AXP20X_ADC_RATE_MASK GENMASK(7, 6)
34 #define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
35
36 #define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
37
38 #define AXP813_V_I_ADC_RATE_MASK GENMASK(5, 4)
39 #define AXP813_ADC_RATE_MASK (AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK)
40 #define AXP813_TS_GPIO0_ADC_RATE_HZ(x) AXP20X_ADC_RATE_HZ(x)
41 #define AXP813_V_I_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK)
42 #define AXP813_ADC_RATE_HZ(x) (AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x))
43
44 #define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \
45 { \
46 .type = _type, \
47 .indexed = 1, \
48 .channel = _channel, \
49 .address = _reg, \
50 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
51 BIT(IIO_CHAN_INFO_SCALE), \
52 .datasheet_name = _name, \
53 }
54
55 #define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \
56 { \
57 .type = _type, \
58 .indexed = 1, \
59 .channel = _channel, \
60 .address = _reg, \
61 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
62 BIT(IIO_CHAN_INFO_SCALE) |\
63 BIT(IIO_CHAN_INFO_OFFSET),\
64 .datasheet_name = _name, \
65 }
66
67 struct axp_data;
68
69 struct axp20x_adc_iio {
70 struct regmap *regmap;
71 const struct axp_data *data;
72 };
73
74 enum axp20x_adc_channel_v {
75 AXP20X_ACIN_V = 0,
76 AXP20X_VBUS_V,
77 AXP20X_TS_IN,
78 AXP20X_GPIO0_V,
79 AXP20X_GPIO1_V,
80 AXP20X_IPSOUT_V,
81 AXP20X_BATT_V,
82 };
83
84 enum axp20x_adc_channel_i {
85 AXP20X_ACIN_I = 0,
86 AXP20X_VBUS_I,
87 AXP20X_BATT_CHRG_I,
88 AXP20X_BATT_DISCHRG_I,
89 };
90
91 enum axp22x_adc_channel_v {
92 AXP22X_TS_IN = 0,
93 AXP22X_BATT_V,
94 };
95
96 enum axp22x_adc_channel_i {
97 AXP22X_BATT_CHRG_I = 1,
98 AXP22X_BATT_DISCHRG_I,
99 };
100
101 enum axp813_adc_channel_v {
102 AXP813_TS_IN = 0,
103 AXP813_GPIO0_V,
104 AXP813_BATT_V,
105 };
106
107 static struct iio_map axp20x_maps[] = {
108 {
109 .consumer_dev_name = "axp20x-usb-power-supply",
110 .consumer_channel = "vbus_v",
111 .adc_channel_label = "vbus_v",
112 }, {
113 .consumer_dev_name = "axp20x-usb-power-supply",
114 .consumer_channel = "vbus_i",
115 .adc_channel_label = "vbus_i",
116 }, {
117 .consumer_dev_name = "axp20x-ac-power-supply",
118 .consumer_channel = "acin_v",
119 .adc_channel_label = "acin_v",
120 }, {
121 .consumer_dev_name = "axp20x-ac-power-supply",
122 .consumer_channel = "acin_i",
123 .adc_channel_label = "acin_i",
124 }, {
125 .consumer_dev_name = "axp20x-battery-power-supply",
126 .consumer_channel = "batt_v",
127 .adc_channel_label = "batt_v",
128 }, {
129 .consumer_dev_name = "axp20x-battery-power-supply",
130 .consumer_channel = "batt_chrg_i",
131 .adc_channel_label = "batt_chrg_i",
132 }, {
133 .consumer_dev_name = "axp20x-battery-power-supply",
134 .consumer_channel = "batt_dischrg_i",
135 .adc_channel_label = "batt_dischrg_i",
136 }, { /* sentinel */ }
137 };
138
139 static struct iio_map axp22x_maps[] = {
140 {
141 .consumer_dev_name = "axp20x-battery-power-supply",
142 .consumer_channel = "batt_v",
143 .adc_channel_label = "batt_v",
144 }, {
145 .consumer_dev_name = "axp20x-battery-power-supply",
146 .consumer_channel = "batt_chrg_i",
147 .adc_channel_label = "batt_chrg_i",
148 }, {
149 .consumer_dev_name = "axp20x-battery-power-supply",
150 .consumer_channel = "batt_dischrg_i",
151 .adc_channel_label = "batt_dischrg_i",
152 }, { /* sentinel */ }
153 };
154
155 /*
156 * Channels are mapped by physical system. Their channels share the same index.
157 * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw.
158 * The only exception is for the battery. batt_v will be in_voltage6_raw and
159 * charge current in_current6_raw and discharge current will be in_current7_raw.
160 */
161 static const struct iio_chan_spec axp20x_adc_channels[] = {
162 AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE,
163 AXP20X_ACIN_V_ADC_H),
164 AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT,
165 AXP20X_ACIN_I_ADC_H),
166 AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE,
167 AXP20X_VBUS_V_ADC_H),
168 AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT,
169 AXP20X_VBUS_I_ADC_H),
170 {
171 .type = IIO_TEMP,
172 .address = AXP20X_TEMP_ADC_H,
173 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
174 BIT(IIO_CHAN_INFO_SCALE) |
175 BIT(IIO_CHAN_INFO_OFFSET),
176 .datasheet_name = "pmic_temp",
177 },
178 AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE,
179 AXP20X_GPIO0_V_ADC_H),
180 AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE,
181 AXP20X_GPIO1_V_ADC_H),
182 AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE,
183 AXP20X_IPSOUT_V_HIGH_H),
184 AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE,
185 AXP20X_BATT_V_H),
186 AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
187 AXP20X_BATT_CHRG_I_H),
188 AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
189 AXP20X_BATT_DISCHRG_I_H),
190 AXP20X_ADC_CHANNEL(AXP20X_TS_IN, "ts_v", IIO_VOLTAGE,
191 AXP20X_TS_IN_H),
192 };
193
194 static const struct iio_chan_spec axp22x_adc_channels[] = {
195 {
196 .type = IIO_TEMP,
197 .address = AXP22X_PMIC_TEMP_H,
198 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
199 BIT(IIO_CHAN_INFO_SCALE) |
200 BIT(IIO_CHAN_INFO_OFFSET),
201 .datasheet_name = "pmic_temp",
202 },
203 AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE,
204 AXP20X_BATT_V_H),
205 AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
206 AXP20X_BATT_CHRG_I_H),
207 AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
208 AXP20X_BATT_DISCHRG_I_H),
209 AXP20X_ADC_CHANNEL(AXP22X_TS_IN, "ts_v", IIO_VOLTAGE,
210 AXP22X_TS_ADC_H),
211 };
212
213 static const struct iio_chan_spec axp813_adc_channels[] = {
214 {
215 .type = IIO_TEMP,
216 .address = AXP22X_PMIC_TEMP_H,
217 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
218 BIT(IIO_CHAN_INFO_SCALE) |
219 BIT(IIO_CHAN_INFO_OFFSET),
220 .datasheet_name = "pmic_temp",
221 },
222 AXP20X_ADC_CHANNEL(AXP813_GPIO0_V, "gpio0_v", IIO_VOLTAGE,
223 AXP288_GP_ADC_H),
224 AXP20X_ADC_CHANNEL(AXP813_BATT_V, "batt_v", IIO_VOLTAGE,
225 AXP20X_BATT_V_H),
226 AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
227 AXP20X_BATT_CHRG_I_H),
228 AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
229 AXP20X_BATT_DISCHRG_I_H),
230 AXP20X_ADC_CHANNEL(AXP813_TS_IN, "ts_v", IIO_VOLTAGE,
231 AXP288_TS_ADC_H),
232 };
233
axp20x_adc_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)234 static int axp20x_adc_raw(struct iio_dev *indio_dev,
235 struct iio_chan_spec const *chan, int *val)
236 {
237 struct axp20x_adc_iio *info = iio_priv(indio_dev);
238 int ret, size;
239
240 /*
241 * N.B.: Unlike the Chinese datasheets tell, the charging current is
242 * stored on 12 bits, not 13 bits. Only discharging current is on 13
243 * bits.
244 */
245 if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I)
246 size = 13;
247 else
248 size = 12;
249
250 ret = axp20x_read_variable_width(info->regmap, chan->address, size);
251 if (ret < 0)
252 return ret;
253
254 *val = ret;
255 return IIO_VAL_INT;
256 }
257
axp22x_adc_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)258 static int axp22x_adc_raw(struct iio_dev *indio_dev,
259 struct iio_chan_spec const *chan, int *val)
260 {
261 struct axp20x_adc_iio *info = iio_priv(indio_dev);
262 int ret;
263
264 ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
265 if (ret < 0)
266 return ret;
267
268 *val = ret;
269 return IIO_VAL_INT;
270 }
271
axp813_adc_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)272 static int axp813_adc_raw(struct iio_dev *indio_dev,
273 struct iio_chan_spec const *chan, int *val)
274 {
275 struct axp20x_adc_iio *info = iio_priv(indio_dev);
276 int ret;
277
278 ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
279 if (ret < 0)
280 return ret;
281
282 *val = ret;
283 return IIO_VAL_INT;
284 }
285
axp20x_adc_scale_voltage(int channel,int * val,int * val2)286 static int axp20x_adc_scale_voltage(int channel, int *val, int *val2)
287 {
288 switch (channel) {
289 case AXP20X_ACIN_V:
290 case AXP20X_VBUS_V:
291 *val = 1;
292 *val2 = 700000;
293 return IIO_VAL_INT_PLUS_MICRO;
294
295 case AXP20X_GPIO0_V:
296 case AXP20X_GPIO1_V:
297 *val = 0;
298 *val2 = 500000;
299 return IIO_VAL_INT_PLUS_MICRO;
300
301 case AXP20X_BATT_V:
302 *val = 1;
303 *val2 = 100000;
304 return IIO_VAL_INT_PLUS_MICRO;
305
306 case AXP20X_IPSOUT_V:
307 *val = 1;
308 *val2 = 400000;
309 return IIO_VAL_INT_PLUS_MICRO;
310
311 case AXP20X_TS_IN:
312 /* 0.8 mV per LSB */
313 *val = 0;
314 *val2 = 800000;
315 return IIO_VAL_INT_PLUS_MICRO;
316
317 default:
318 return -EINVAL;
319 }
320 }
321
axp22x_adc_scale_voltage(int channel,int * val,int * val2)322 static int axp22x_adc_scale_voltage(int channel, int *val, int *val2)
323 {
324 switch (channel) {
325 case AXP22X_BATT_V:
326 /* 1.1 mV per LSB */
327 *val = 1;
328 *val2 = 100000;
329 return IIO_VAL_INT_PLUS_MICRO;
330
331 case AXP22X_TS_IN:
332 /* 0.8 mV per LSB */
333 *val = 0;
334 *val2 = 800000;
335 return IIO_VAL_INT_PLUS_MICRO;
336
337 default:
338 return -EINVAL;
339 }
340 }
axp813_adc_scale_voltage(int channel,int * val,int * val2)341 static int axp813_adc_scale_voltage(int channel, int *val, int *val2)
342 {
343 switch (channel) {
344 case AXP813_GPIO0_V:
345 *val = 0;
346 *val2 = 800000;
347 return IIO_VAL_INT_PLUS_MICRO;
348
349 case AXP813_BATT_V:
350 *val = 1;
351 *val2 = 100000;
352 return IIO_VAL_INT_PLUS_MICRO;
353
354 case AXP813_TS_IN:
355 /* 0.8 mV per LSB */
356 *val = 0;
357 *val2 = 800000;
358 return IIO_VAL_INT_PLUS_MICRO;
359
360 default:
361 return -EINVAL;
362 }
363 }
364
axp20x_adc_scale_current(int channel,int * val,int * val2)365 static int axp20x_adc_scale_current(int channel, int *val, int *val2)
366 {
367 switch (channel) {
368 case AXP20X_ACIN_I:
369 *val = 0;
370 *val2 = 625000;
371 return IIO_VAL_INT_PLUS_MICRO;
372
373 case AXP20X_VBUS_I:
374 *val = 0;
375 *val2 = 375000;
376 return IIO_VAL_INT_PLUS_MICRO;
377
378 case AXP20X_BATT_DISCHRG_I:
379 case AXP20X_BATT_CHRG_I:
380 *val = 0;
381 *val2 = 500000;
382 return IIO_VAL_INT_PLUS_MICRO;
383
384 default:
385 return -EINVAL;
386 }
387 }
388
axp20x_adc_scale(struct iio_chan_spec const * chan,int * val,int * val2)389 static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val,
390 int *val2)
391 {
392 switch (chan->type) {
393 case IIO_VOLTAGE:
394 return axp20x_adc_scale_voltage(chan->channel, val, val2);
395
396 case IIO_CURRENT:
397 return axp20x_adc_scale_current(chan->channel, val, val2);
398
399 case IIO_TEMP:
400 *val = 100;
401 return IIO_VAL_INT;
402
403 default:
404 return -EINVAL;
405 }
406 }
407
axp22x_adc_scale(struct iio_chan_spec const * chan,int * val,int * val2)408 static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val,
409 int *val2)
410 {
411 switch (chan->type) {
412 case IIO_VOLTAGE:
413 return axp22x_adc_scale_voltage(chan->channel, val, val2);
414
415 case IIO_CURRENT:
416 *val = 1;
417 return IIO_VAL_INT;
418
419 case IIO_TEMP:
420 *val = 100;
421 return IIO_VAL_INT;
422
423 default:
424 return -EINVAL;
425 }
426 }
427
axp813_adc_scale(struct iio_chan_spec const * chan,int * val,int * val2)428 static int axp813_adc_scale(struct iio_chan_spec const *chan, int *val,
429 int *val2)
430 {
431 switch (chan->type) {
432 case IIO_VOLTAGE:
433 return axp813_adc_scale_voltage(chan->channel, val, val2);
434
435 case IIO_CURRENT:
436 *val = 1;
437 return IIO_VAL_INT;
438
439 case IIO_TEMP:
440 *val = 100;
441 return IIO_VAL_INT;
442
443 default:
444 return -EINVAL;
445 }
446 }
447
axp20x_adc_offset_voltage(struct iio_dev * indio_dev,int channel,int * val)448 static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
449 int *val)
450 {
451 struct axp20x_adc_iio *info = iio_priv(indio_dev);
452 unsigned int regval;
453 int ret;
454
455 ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, ®val);
456 if (ret < 0)
457 return ret;
458
459 switch (channel) {
460 case AXP20X_GPIO0_V:
461 regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO0, regval);
462 break;
463
464 case AXP20X_GPIO1_V:
465 regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO1, regval);
466 break;
467
468 default:
469 return -EINVAL;
470 }
471
472 *val = regval ? 700000 : 0;
473 return IIO_VAL_INT;
474 }
475
axp20x_adc_offset(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)476 static int axp20x_adc_offset(struct iio_dev *indio_dev,
477 struct iio_chan_spec const *chan, int *val)
478 {
479 switch (chan->type) {
480 case IIO_VOLTAGE:
481 return axp20x_adc_offset_voltage(indio_dev, chan->channel, val);
482
483 case IIO_TEMP:
484 *val = -1447;
485 return IIO_VAL_INT;
486
487 default:
488 return -EINVAL;
489 }
490 }
491
axp20x_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)492 static int axp20x_read_raw(struct iio_dev *indio_dev,
493 struct iio_chan_spec const *chan, int *val,
494 int *val2, long mask)
495 {
496 switch (mask) {
497 case IIO_CHAN_INFO_OFFSET:
498 return axp20x_adc_offset(indio_dev, chan, val);
499
500 case IIO_CHAN_INFO_SCALE:
501 return axp20x_adc_scale(chan, val, val2);
502
503 case IIO_CHAN_INFO_RAW:
504 return axp20x_adc_raw(indio_dev, chan, val);
505
506 default:
507 return -EINVAL;
508 }
509 }
510
axp22x_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)511 static int axp22x_read_raw(struct iio_dev *indio_dev,
512 struct iio_chan_spec const *chan, int *val,
513 int *val2, long mask)
514 {
515 switch (mask) {
516 case IIO_CHAN_INFO_OFFSET:
517 /* For PMIC temp only */
518 *val = -2677;
519 return IIO_VAL_INT;
520
521 case IIO_CHAN_INFO_SCALE:
522 return axp22x_adc_scale(chan, val, val2);
523
524 case IIO_CHAN_INFO_RAW:
525 return axp22x_adc_raw(indio_dev, chan, val);
526
527 default:
528 return -EINVAL;
529 }
530 }
531
axp813_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)532 static int axp813_read_raw(struct iio_dev *indio_dev,
533 struct iio_chan_spec const *chan, int *val,
534 int *val2, long mask)
535 {
536 switch (mask) {
537 case IIO_CHAN_INFO_OFFSET:
538 *val = -2667;
539 return IIO_VAL_INT;
540
541 case IIO_CHAN_INFO_SCALE:
542 return axp813_adc_scale(chan, val, val2);
543
544 case IIO_CHAN_INFO_RAW:
545 return axp813_adc_raw(indio_dev, chan, val);
546
547 default:
548 return -EINVAL;
549 }
550 }
551
axp20x_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)552 static int axp20x_write_raw(struct iio_dev *indio_dev,
553 struct iio_chan_spec const *chan, int val, int val2,
554 long mask)
555 {
556 struct axp20x_adc_iio *info = iio_priv(indio_dev);
557 unsigned int regmask, regval;
558
559 /*
560 * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets
561 * for (independently) GPIO0 and GPIO1 when in ADC mode.
562 */
563 if (mask != IIO_CHAN_INFO_OFFSET)
564 return -EINVAL;
565
566 if (val != 0 && val != 700000)
567 return -EINVAL;
568
569 switch (chan->channel) {
570 case AXP20X_GPIO0_V:
571 regmask = AXP20X_GPIO10_IN_RANGE_GPIO0;
572 regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO0, !!val);
573 break;
574
575 case AXP20X_GPIO1_V:
576 regmask = AXP20X_GPIO10_IN_RANGE_GPIO1;
577 regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO1, !!val);
578 break;
579
580 default:
581 return -EINVAL;
582 }
583
584 return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, regmask, regval);
585 }
586
587 static const struct iio_info axp20x_adc_iio_info = {
588 .read_raw = axp20x_read_raw,
589 .write_raw = axp20x_write_raw,
590 };
591
592 static const struct iio_info axp22x_adc_iio_info = {
593 .read_raw = axp22x_read_raw,
594 };
595
596 static const struct iio_info axp813_adc_iio_info = {
597 .read_raw = axp813_read_raw,
598 };
599
axp20x_adc_rate(struct axp20x_adc_iio * info,int rate)600 static int axp20x_adc_rate(struct axp20x_adc_iio *info, int rate)
601 {
602 return regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
603 AXP20X_ADC_RATE_MASK,
604 AXP20X_ADC_RATE_HZ(rate));
605 }
606
axp22x_adc_rate(struct axp20x_adc_iio * info,int rate)607 static int axp22x_adc_rate(struct axp20x_adc_iio *info, int rate)
608 {
609 return regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
610 AXP20X_ADC_RATE_MASK,
611 AXP22X_ADC_RATE_HZ(rate));
612 }
613
axp813_adc_rate(struct axp20x_adc_iio * info,int rate)614 static int axp813_adc_rate(struct axp20x_adc_iio *info, int rate)
615 {
616 return regmap_update_bits(info->regmap, AXP813_ADC_RATE,
617 AXP813_ADC_RATE_MASK,
618 AXP813_ADC_RATE_HZ(rate));
619 }
620
621 struct axp_data {
622 const struct iio_info *iio_info;
623 int num_channels;
624 struct iio_chan_spec const *channels;
625 unsigned long adc_en1_mask;
626 unsigned long adc_en2_mask;
627 int (*adc_rate)(struct axp20x_adc_iio *info,
628 int rate);
629 struct iio_map *maps;
630 };
631
632 static const struct axp_data axp20x_data = {
633 .iio_info = &axp20x_adc_iio_info,
634 .num_channels = ARRAY_SIZE(axp20x_adc_channels),
635 .channels = axp20x_adc_channels,
636 .adc_en1_mask = AXP20X_ADC_EN1_MASK,
637 .adc_en2_mask = AXP20X_ADC_EN2_MASK,
638 .adc_rate = axp20x_adc_rate,
639 .maps = axp20x_maps,
640 };
641
642 static const struct axp_data axp22x_data = {
643 .iio_info = &axp22x_adc_iio_info,
644 .num_channels = ARRAY_SIZE(axp22x_adc_channels),
645 .channels = axp22x_adc_channels,
646 .adc_en1_mask = AXP22X_ADC_EN1_MASK,
647 .adc_rate = axp22x_adc_rate,
648 .maps = axp22x_maps,
649 };
650
651 static const struct axp_data axp813_data = {
652 .iio_info = &axp813_adc_iio_info,
653 .num_channels = ARRAY_SIZE(axp813_adc_channels),
654 .channels = axp813_adc_channels,
655 .adc_en1_mask = AXP22X_ADC_EN1_MASK,
656 .adc_rate = axp813_adc_rate,
657 .maps = axp22x_maps,
658 };
659
660 static const struct of_device_id axp20x_adc_of_match[] = {
661 { .compatible = "x-powers,axp209-adc", .data = (void *)&axp20x_data, },
662 { .compatible = "x-powers,axp221-adc", .data = (void *)&axp22x_data, },
663 { .compatible = "x-powers,axp813-adc", .data = (void *)&axp813_data, },
664 { /* sentinel */ }
665 };
666 MODULE_DEVICE_TABLE(of, axp20x_adc_of_match);
667
668 static const struct platform_device_id axp20x_adc_id_match[] = {
669 { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, },
670 { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, },
671 { .name = "axp813-adc", .driver_data = (kernel_ulong_t)&axp813_data, },
672 { /* sentinel */ },
673 };
674 MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match);
675
axp20x_probe(struct platform_device * pdev)676 static int axp20x_probe(struct platform_device *pdev)
677 {
678 struct axp20x_adc_iio *info;
679 struct iio_dev *indio_dev;
680 struct axp20x_dev *axp20x_dev;
681 int ret;
682
683 axp20x_dev = dev_get_drvdata(pdev->dev.parent);
684
685 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
686 if (!indio_dev)
687 return -ENOMEM;
688
689 info = iio_priv(indio_dev);
690 platform_set_drvdata(pdev, indio_dev);
691
692 info->regmap = axp20x_dev->regmap;
693 indio_dev->modes = INDIO_DIRECT_MODE;
694
695 if (!dev_fwnode(&pdev->dev)) {
696 const struct platform_device_id *id;
697
698 id = platform_get_device_id(pdev);
699 info->data = (const struct axp_data *)id->driver_data;
700 } else {
701 struct device *dev = &pdev->dev;
702
703 info->data = device_get_match_data(dev);
704 }
705
706 indio_dev->name = platform_get_device_id(pdev)->name;
707 indio_dev->info = info->data->iio_info;
708 indio_dev->num_channels = info->data->num_channels;
709 indio_dev->channels = info->data->channels;
710
711 /* Enable the ADCs on IP */
712 regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask);
713
714 if (info->data->adc_en2_mask)
715 regmap_update_bits(info->regmap, AXP20X_ADC_EN2,
716 info->data->adc_en2_mask,
717 info->data->adc_en2_mask);
718
719 /* Configure ADCs rate */
720 info->data->adc_rate(info, 100);
721
722 ret = iio_map_array_register(indio_dev, info->data->maps);
723 if (ret < 0) {
724 dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret);
725 goto fail_map;
726 }
727
728 ret = iio_device_register(indio_dev);
729 if (ret < 0) {
730 dev_err(&pdev->dev, "could not register the device\n");
731 goto fail_register;
732 }
733
734 return 0;
735
736 fail_register:
737 iio_map_array_unregister(indio_dev);
738
739 fail_map:
740 regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
741
742 if (info->data->adc_en2_mask)
743 regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
744
745 return ret;
746 }
747
axp20x_remove(struct platform_device * pdev)748 static int axp20x_remove(struct platform_device *pdev)
749 {
750 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
751 struct axp20x_adc_iio *info = iio_priv(indio_dev);
752
753 iio_device_unregister(indio_dev);
754 iio_map_array_unregister(indio_dev);
755
756 regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
757
758 if (info->data->adc_en2_mask)
759 regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
760
761 return 0;
762 }
763
764 static struct platform_driver axp20x_adc_driver = {
765 .driver = {
766 .name = "axp20x-adc",
767 .of_match_table = axp20x_adc_of_match,
768 },
769 .id_table = axp20x_adc_id_match,
770 .probe = axp20x_probe,
771 .remove = axp20x_remove,
772 };
773
774 module_platform_driver(axp20x_adc_driver);
775
776 MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs");
777 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
778 MODULE_LICENSE("GPL");
779
