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0917de94 SV |
1 | /* |
2 | * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/bitops.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/iio/iio.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/kernel.h> | |
937125ac | 21 | #include <linux/math64.h> |
0917de94 SV |
22 | #include <linux/module.h> |
23 | #include <linux/of.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/regmap.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/log2.h> | |
28 | ||
29 | #include <dt-bindings/iio/qcom,spmi-vadc.h> | |
30 | ||
31 | /* VADC register and bit definitions */ | |
32 | #define VADC_REVISION2 0x1 | |
33 | #define VADC_REVISION2_SUPPORTED_VADC 1 | |
34 | ||
35 | #define VADC_PERPH_TYPE 0x4 | |
36 | #define VADC_PERPH_TYPE_ADC 8 | |
37 | ||
38 | #define VADC_PERPH_SUBTYPE 0x5 | |
39 | #define VADC_PERPH_SUBTYPE_VADC 1 | |
40 | ||
41 | #define VADC_STATUS1 0x8 | |
42 | #define VADC_STATUS1_OP_MODE 4 | |
43 | #define VADC_STATUS1_REQ_STS BIT(1) | |
44 | #define VADC_STATUS1_EOC BIT(0) | |
45 | #define VADC_STATUS1_REQ_STS_EOC_MASK 0x3 | |
46 | ||
47 | #define VADC_MODE_CTL 0x40 | |
48 | #define VADC_OP_MODE_SHIFT 3 | |
49 | #define VADC_OP_MODE_NORMAL 0 | |
50 | #define VADC_AMUX_TRIM_EN BIT(1) | |
51 | #define VADC_ADC_TRIM_EN BIT(0) | |
52 | ||
53 | #define VADC_EN_CTL1 0x46 | |
54 | #define VADC_EN_CTL1_SET BIT(7) | |
55 | ||
56 | #define VADC_ADC_CH_SEL_CTL 0x48 | |
57 | ||
58 | #define VADC_ADC_DIG_PARAM 0x50 | |
59 | #define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2 | |
60 | ||
61 | #define VADC_HW_SETTLE_DELAY 0x51 | |
62 | ||
63 | #define VADC_CONV_REQ 0x52 | |
64 | #define VADC_CONV_REQ_SET BIT(7) | |
65 | ||
66 | #define VADC_FAST_AVG_CTL 0x5a | |
67 | #define VADC_FAST_AVG_EN 0x5b | |
68 | #define VADC_FAST_AVG_EN_SET BIT(7) | |
69 | ||
70 | #define VADC_ACCESS 0xd0 | |
71 | #define VADC_ACCESS_DATA 0xa5 | |
72 | ||
73 | #define VADC_PERH_RESET_CTL3 0xda | |
74 | #define VADC_FOLLOW_WARM_RB BIT(2) | |
75 | ||
76 | #define VADC_DATA 0x60 /* 16 bits */ | |
77 | ||
78 | #define VADC_CONV_TIME_MIN_US 2000 | |
79 | #define VADC_CONV_TIME_MAX_US 2100 | |
80 | ||
81 | /* Min ADC code represents 0V */ | |
82 | #define VADC_MIN_ADC_CODE 0x6000 | |
83 | /* Max ADC code represents full-scale range of 1.8V */ | |
84 | #define VADC_MAX_ADC_CODE 0xa800 | |
85 | ||
86 | #define VADC_ABSOLUTE_RANGE_UV 625000 | |
87 | #define VADC_RATIOMETRIC_RANGE_UV 1800000 | |
88 | ||
89 | #define VADC_DEF_PRESCALING 0 /* 1:1 */ | |
90 | #define VADC_DEF_DECIMATION 0 /* 512 */ | |
91 | #define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */ | |
92 | #define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */ | |
93 | #define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE | |
94 | ||
95 | #define VADC_DECIMATION_MIN 512 | |
96 | #define VADC_DECIMATION_MAX 4096 | |
97 | ||
98 | #define VADC_HW_SETTLE_DELAY_MAX 10000 | |
99 | #define VADC_AVG_SAMPLES_MAX 512 | |
100 | ||
101 | #define KELVINMIL_CELSIUSMIL 273150 | |
102 | ||
103 | #define VADC_CHAN_MIN VADC_USBIN | |
104 | #define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM | |
105 | ||
106 | /* | |
107 | * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels. | |
108 | * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for | |
109 | * calibration. | |
110 | */ | |
111 | enum vadc_calibration { | |
112 | VADC_CALIB_ABSOLUTE = 0, | |
113 | VADC_CALIB_RATIOMETRIC | |
114 | }; | |
115 | ||
116 | /** | |
117 | * struct vadc_linear_graph - Represent ADC characteristics. | |
118 | * @dy: numerator slope to calculate the gain. | |
119 | * @dx: denominator slope to calculate the gain. | |
120 | * @gnd: A/D word of the ground reference used for the channel. | |
121 | * | |
122 | * Each ADC device has different offset and gain parameters which are | |
123 | * computed to calibrate the device. | |
124 | */ | |
125 | struct vadc_linear_graph { | |
126 | s32 dy; | |
127 | s32 dx; | |
128 | s32 gnd; | |
129 | }; | |
130 | ||
131 | /** | |
132 | * struct vadc_prescale_ratio - Represent scaling ratio for ADC input. | |
133 | * @num: the inverse numerator of the gain applied to the input channel. | |
134 | * @den: the inverse denominator of the gain applied to the input channel. | |
135 | */ | |
136 | struct vadc_prescale_ratio { | |
137 | u32 num; | |
138 | u32 den; | |
139 | }; | |
140 | ||
141 | /** | |
142 | * struct vadc_channel_prop - VADC channel property. | |
143 | * @channel: channel number, refer to the channel list. | |
144 | * @calibration: calibration type. | |
145 | * @decimation: sampling rate supported for the channel. | |
146 | * @prescale: channel scaling performed on the input signal. | |
147 | * @hw_settle_time: the time between AMUX being configured and the | |
148 | * start of conversion. | |
149 | * @avg_samples: ability to provide single result from the ADC | |
150 | * that is an average of multiple measurements. | |
151 | */ | |
152 | struct vadc_channel_prop { | |
153 | unsigned int channel; | |
154 | enum vadc_calibration calibration; | |
155 | unsigned int decimation; | |
156 | unsigned int prescale; | |
157 | unsigned int hw_settle_time; | |
158 | unsigned int avg_samples; | |
159 | }; | |
160 | ||
161 | /** | |
162 | * struct vadc_priv - VADC private structure. | |
163 | * @regmap: pointer to struct regmap. | |
164 | * @dev: pointer to struct device. | |
165 | * @base: base address for the ADC peripheral. | |
166 | * @nchannels: number of VADC channels. | |
167 | * @chan_props: array of VADC channel properties. | |
168 | * @iio_chans: array of IIO channels specification. | |
169 | * @are_ref_measured: are reference points measured. | |
170 | * @poll_eoc: use polling instead of interrupt. | |
171 | * @complete: VADC result notification after interrupt is received. | |
172 | * @graph: store parameters for calibration. | |
173 | * @lock: ADC lock for access to the peripheral. | |
174 | */ | |
175 | struct vadc_priv { | |
176 | struct regmap *regmap; | |
177 | struct device *dev; | |
178 | u16 base; | |
179 | unsigned int nchannels; | |
180 | struct vadc_channel_prop *chan_props; | |
181 | struct iio_chan_spec *iio_chans; | |
182 | bool are_ref_measured; | |
183 | bool poll_eoc; | |
184 | struct completion complete; | |
185 | struct vadc_linear_graph graph[2]; | |
186 | struct mutex lock; | |
187 | }; | |
188 | ||
189 | static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { | |
190 | {.num = 1, .den = 1}, | |
191 | {.num = 1, .den = 3}, | |
192 | {.num = 1, .den = 4}, | |
193 | {.num = 1, .den = 6}, | |
194 | {.num = 1, .den = 20}, | |
195 | {.num = 1, .den = 8}, | |
196 | {.num = 10, .den = 81}, | |
197 | {.num = 1, .den = 10} | |
198 | }; | |
199 | ||
200 | static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data) | |
201 | { | |
202 | return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1); | |
203 | } | |
204 | ||
205 | static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data) | |
206 | { | |
207 | return regmap_write(vadc->regmap, vadc->base + offset, data); | |
208 | } | |
209 | ||
210 | static int vadc_reset(struct vadc_priv *vadc) | |
211 | { | |
212 | u8 data; | |
213 | int ret; | |
214 | ||
215 | ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data); | |
220 | if (ret) | |
221 | return ret; | |
222 | ||
223 | ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); | |
224 | if (ret) | |
225 | return ret; | |
226 | ||
227 | data |= VADC_FOLLOW_WARM_RB; | |
228 | ||
229 | return vadc_write(vadc, VADC_PERH_RESET_CTL3, data); | |
230 | } | |
231 | ||
232 | static int vadc_set_state(struct vadc_priv *vadc, bool state) | |
233 | { | |
234 | return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0); | |
235 | } | |
236 | ||
237 | static void vadc_show_status(struct vadc_priv *vadc) | |
238 | { | |
239 | u8 mode, sta1, chan, dig, en, req; | |
240 | int ret; | |
241 | ||
242 | ret = vadc_read(vadc, VADC_MODE_CTL, &mode); | |
243 | if (ret) | |
244 | return; | |
245 | ||
246 | ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig); | |
247 | if (ret) | |
248 | return; | |
249 | ||
250 | ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan); | |
251 | if (ret) | |
252 | return; | |
253 | ||
254 | ret = vadc_read(vadc, VADC_CONV_REQ, &req); | |
255 | if (ret) | |
256 | return; | |
257 | ||
258 | ret = vadc_read(vadc, VADC_STATUS1, &sta1); | |
259 | if (ret) | |
260 | return; | |
261 | ||
262 | ret = vadc_read(vadc, VADC_EN_CTL1, &en); | |
263 | if (ret) | |
264 | return; | |
265 | ||
266 | dev_err(vadc->dev, | |
267 | "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n", | |
268 | mode, en, chan, dig, req, sta1); | |
269 | } | |
270 | ||
271 | static int vadc_configure(struct vadc_priv *vadc, | |
272 | struct vadc_channel_prop *prop) | |
273 | { | |
274 | u8 decimation, mode_ctrl; | |
275 | int ret; | |
276 | ||
277 | /* Mode selection */ | |
278 | mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) | | |
279 | VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN; | |
280 | ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl); | |
281 | if (ret) | |
282 | return ret; | |
283 | ||
284 | /* Channel selection */ | |
285 | ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel); | |
286 | if (ret) | |
287 | return ret; | |
288 | ||
289 | /* Digital parameter setup */ | |
290 | decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT; | |
291 | ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation); | |
292 | if (ret) | |
293 | return ret; | |
294 | ||
295 | /* HW settle time delay */ | |
296 | ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time); | |
297 | if (ret) | |
298 | return ret; | |
299 | ||
300 | ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples); | |
301 | if (ret) | |
302 | return ret; | |
303 | ||
304 | if (prop->avg_samples) | |
305 | ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET); | |
306 | else | |
307 | ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0); | |
308 | ||
309 | return ret; | |
310 | } | |
311 | ||
312 | static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us) | |
313 | { | |
314 | unsigned int count, retry; | |
315 | u8 sta1; | |
316 | int ret; | |
317 | ||
318 | retry = interval_us / VADC_CONV_TIME_MIN_US; | |
319 | ||
320 | for (count = 0; count < retry; count++) { | |
321 | ret = vadc_read(vadc, VADC_STATUS1, &sta1); | |
322 | if (ret) | |
323 | return ret; | |
324 | ||
325 | sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK; | |
326 | if (sta1 == VADC_STATUS1_EOC) | |
327 | return 0; | |
328 | ||
329 | usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US); | |
330 | } | |
331 | ||
332 | vadc_show_status(vadc); | |
333 | ||
334 | return -ETIMEDOUT; | |
335 | } | |
336 | ||
337 | static int vadc_read_result(struct vadc_priv *vadc, u16 *data) | |
338 | { | |
339 | int ret; | |
340 | ||
341 | ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2); | |
342 | if (ret) | |
343 | return ret; | |
344 | ||
345 | *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc, | |
351 | unsigned int num) | |
352 | { | |
353 | unsigned int i; | |
354 | ||
355 | for (i = 0; i < vadc->nchannels; i++) | |
356 | if (vadc->chan_props[i].channel == num) | |
357 | return &vadc->chan_props[i]; | |
358 | ||
359 | dev_dbg(vadc->dev, "no such channel %02x\n", num); | |
360 | ||
361 | return NULL; | |
362 | } | |
363 | ||
364 | static int vadc_do_conversion(struct vadc_priv *vadc, | |
365 | struct vadc_channel_prop *prop, u16 *data) | |
366 | { | |
367 | unsigned int timeout; | |
368 | int ret; | |
369 | ||
370 | mutex_lock(&vadc->lock); | |
371 | ||
372 | ret = vadc_configure(vadc, prop); | |
373 | if (ret) | |
374 | goto unlock; | |
375 | ||
376 | if (!vadc->poll_eoc) | |
377 | reinit_completion(&vadc->complete); | |
378 | ||
379 | ret = vadc_set_state(vadc, true); | |
380 | if (ret) | |
381 | goto unlock; | |
382 | ||
383 | ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET); | |
384 | if (ret) | |
385 | goto err_disable; | |
386 | ||
387 | timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2; | |
388 | ||
389 | if (vadc->poll_eoc) { | |
390 | ret = vadc_poll_wait_eoc(vadc, timeout); | |
391 | } else { | |
392 | ret = wait_for_completion_timeout(&vadc->complete, timeout); | |
393 | if (!ret) { | |
394 | ret = -ETIMEDOUT; | |
395 | goto err_disable; | |
396 | } | |
397 | ||
398 | /* Double check conversion status */ | |
399 | ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US); | |
400 | if (ret) | |
401 | goto err_disable; | |
402 | } | |
403 | ||
404 | ret = vadc_read_result(vadc, data); | |
405 | ||
406 | err_disable: | |
407 | vadc_set_state(vadc, false); | |
408 | if (ret) | |
409 | dev_err(vadc->dev, "conversion failed\n"); | |
410 | unlock: | |
411 | mutex_unlock(&vadc->lock); | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static int vadc_measure_ref_points(struct vadc_priv *vadc) | |
416 | { | |
417 | struct vadc_channel_prop *prop; | |
418 | u16 read_1, read_2; | |
419 | int ret; | |
420 | ||
421 | vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE_UV; | |
422 | vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV; | |
423 | ||
424 | prop = vadc_get_channel(vadc, VADC_REF_1250MV); | |
425 | ret = vadc_do_conversion(vadc, prop, &read_1); | |
426 | if (ret) | |
427 | goto err; | |
428 | ||
429 | /* Try with buffered 625mV channel first */ | |
430 | prop = vadc_get_channel(vadc, VADC_SPARE1); | |
431 | if (!prop) | |
432 | prop = vadc_get_channel(vadc, VADC_REF_625MV); | |
433 | ||
434 | ret = vadc_do_conversion(vadc, prop, &read_2); | |
435 | if (ret) | |
436 | goto err; | |
437 | ||
438 | if (read_1 == read_2) { | |
439 | ret = -EINVAL; | |
440 | goto err; | |
441 | } | |
442 | ||
443 | vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2; | |
444 | vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2; | |
445 | ||
446 | /* Ratiometric calibration */ | |
447 | prop = vadc_get_channel(vadc, VADC_VDD_VADC); | |
448 | ret = vadc_do_conversion(vadc, prop, &read_1); | |
449 | if (ret) | |
450 | goto err; | |
451 | ||
452 | prop = vadc_get_channel(vadc, VADC_GND_REF); | |
453 | ret = vadc_do_conversion(vadc, prop, &read_2); | |
454 | if (ret) | |
455 | goto err; | |
456 | ||
457 | if (read_1 == read_2) { | |
458 | ret = -EINVAL; | |
459 | goto err; | |
460 | } | |
461 | ||
462 | vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2; | |
463 | vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2; | |
464 | err: | |
465 | if (ret) | |
466 | dev_err(vadc->dev, "measure reference points failed\n"); | |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
471 | static s32 vadc_calibrate(struct vadc_priv *vadc, | |
472 | const struct vadc_channel_prop *prop, u16 adc_code) | |
473 | { | |
474 | const struct vadc_prescale_ratio *prescale; | |
937125ac | 475 | s64 voltage; |
0917de94 SV |
476 | |
477 | voltage = adc_code - vadc->graph[prop->calibration].gnd; | |
478 | voltage *= vadc->graph[prop->calibration].dx; | |
937125ac | 479 | voltage = div64_s64(voltage, vadc->graph[prop->calibration].dy); |
0917de94 SV |
480 | |
481 | if (prop->calibration == VADC_CALIB_ABSOLUTE) | |
482 | voltage += vadc->graph[prop->calibration].dx; | |
483 | ||
484 | if (voltage < 0) | |
485 | voltage = 0; | |
486 | ||
487 | prescale = &vadc_prescale_ratios[prop->prescale]; | |
488 | ||
489 | voltage = voltage * prescale->den; | |
490 | ||
937125ac | 491 | return div64_s64(voltage, prescale->num); |
0917de94 SV |
492 | } |
493 | ||
494 | static int vadc_decimation_from_dt(u32 value) | |
495 | { | |
496 | if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN || | |
497 | value > VADC_DECIMATION_MAX) | |
498 | return -EINVAL; | |
499 | ||
500 | return __ffs64(value / VADC_DECIMATION_MIN); | |
501 | } | |
502 | ||
503 | static int vadc_prescaling_from_dt(u32 num, u32 den) | |
504 | { | |
505 | unsigned int pre; | |
506 | ||
507 | for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++) | |
508 | if (vadc_prescale_ratios[pre].num == num && | |
509 | vadc_prescale_ratios[pre].den == den) | |
510 | break; | |
511 | ||
512 | if (pre == ARRAY_SIZE(vadc_prescale_ratios)) | |
513 | return -EINVAL; | |
514 | ||
515 | return pre; | |
516 | } | |
517 | ||
518 | static int vadc_hw_settle_time_from_dt(u32 value) | |
519 | { | |
520 | if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000)) | |
521 | return -EINVAL; | |
522 | ||
523 | if (value <= 1000) | |
524 | value /= 100; | |
525 | else | |
526 | value = value / 2000 + 10; | |
527 | ||
528 | return value; | |
529 | } | |
530 | ||
531 | static int vadc_avg_samples_from_dt(u32 value) | |
532 | { | |
533 | if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX) | |
534 | return -EINVAL; | |
535 | ||
536 | return __ffs64(value); | |
537 | } | |
538 | ||
539 | static int vadc_read_raw(struct iio_dev *indio_dev, | |
540 | struct iio_chan_spec const *chan, int *val, int *val2, | |
541 | long mask) | |
542 | { | |
543 | struct vadc_priv *vadc = iio_priv(indio_dev); | |
544 | struct vadc_channel_prop *prop; | |
545 | u16 adc_code; | |
546 | int ret; | |
547 | ||
548 | switch (mask) { | |
549 | case IIO_CHAN_INFO_PROCESSED: | |
550 | prop = &vadc->chan_props[chan->address]; | |
551 | ret = vadc_do_conversion(vadc, prop, &adc_code); | |
552 | if (ret) | |
553 | break; | |
554 | ||
555 | *val = vadc_calibrate(vadc, prop, adc_code); | |
556 | ||
557 | /* 2mV/K, return milli Celsius */ | |
558 | *val /= 2; | |
559 | *val -= KELVINMIL_CELSIUSMIL; | |
560 | return IIO_VAL_INT; | |
561 | case IIO_CHAN_INFO_RAW: | |
562 | prop = &vadc->chan_props[chan->address]; | |
563 | ret = vadc_do_conversion(vadc, prop, &adc_code); | |
564 | if (ret) | |
565 | break; | |
566 | ||
567 | *val = vadc_calibrate(vadc, prop, adc_code); | |
568 | return IIO_VAL_INT; | |
569 | case IIO_CHAN_INFO_SCALE: | |
570 | *val = 0; | |
571 | *val2 = 1000; | |
572 | return IIO_VAL_INT_PLUS_MICRO; | |
573 | default: | |
574 | ret = -EINVAL; | |
575 | break; | |
576 | } | |
577 | ||
578 | return ret; | |
579 | } | |
580 | ||
581 | static int vadc_of_xlate(struct iio_dev *indio_dev, | |
582 | const struct of_phandle_args *iiospec) | |
583 | { | |
584 | struct vadc_priv *vadc = iio_priv(indio_dev); | |
585 | unsigned int i; | |
586 | ||
587 | for (i = 0; i < vadc->nchannels; i++) | |
588 | if (vadc->iio_chans[i].channel == iiospec->args[0]) | |
589 | return i; | |
590 | ||
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | static const struct iio_info vadc_info = { | |
595 | .read_raw = vadc_read_raw, | |
596 | .of_xlate = vadc_of_xlate, | |
597 | .driver_module = THIS_MODULE, | |
598 | }; | |
599 | ||
600 | struct vadc_channels { | |
601 | const char *datasheet_name; | |
602 | unsigned int prescale_index; | |
603 | enum iio_chan_type type; | |
604 | long info_mask; | |
605 | }; | |
606 | ||
607 | #define VADC_CHAN(_dname, _type, _mask, _pre) \ | |
608 | [VADC_##_dname] = { \ | |
609 | .datasheet_name = __stringify(_dname), \ | |
610 | .prescale_index = _pre, \ | |
611 | .type = _type, \ | |
612 | .info_mask = _mask \ | |
613 | }, \ | |
614 | ||
615 | #define VADC_CHAN_TEMP(_dname, _pre) \ | |
616 | VADC_CHAN(_dname, IIO_TEMP, BIT(IIO_CHAN_INFO_PROCESSED), _pre) \ | |
617 | ||
618 | #define VADC_CHAN_VOLT(_dname, _pre) \ | |
619 | VADC_CHAN(_dname, IIO_VOLTAGE, \ | |
620 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \ | |
621 | _pre) \ | |
622 | ||
623 | /* | |
624 | * The array represents all possible ADC channels found in the supported PMICs. | |
625 | * Every index in the array is equal to the channel number per datasheet. The | |
626 | * gaps in the array should be treated as reserved channels. | |
627 | */ | |
628 | static const struct vadc_channels vadc_chans[] = { | |
629 | VADC_CHAN_VOLT(USBIN, 4) | |
630 | VADC_CHAN_VOLT(DCIN, 4) | |
631 | VADC_CHAN_VOLT(VCHG_SNS, 3) | |
632 | VADC_CHAN_VOLT(SPARE1_03, 1) | |
633 | VADC_CHAN_VOLT(USB_ID_MV, 1) | |
634 | VADC_CHAN_VOLT(VCOIN, 1) | |
635 | VADC_CHAN_VOLT(VBAT_SNS, 1) | |
636 | VADC_CHAN_VOLT(VSYS, 1) | |
637 | VADC_CHAN_TEMP(DIE_TEMP, 0) | |
638 | VADC_CHAN_VOLT(REF_625MV, 0) | |
639 | VADC_CHAN_VOLT(REF_1250MV, 0) | |
640 | VADC_CHAN_VOLT(CHG_TEMP, 0) | |
641 | VADC_CHAN_VOLT(SPARE1, 0) | |
642 | VADC_CHAN_VOLT(SPARE2, 0) | |
643 | VADC_CHAN_VOLT(GND_REF, 0) | |
644 | VADC_CHAN_VOLT(VDD_VADC, 0) | |
645 | ||
646 | VADC_CHAN_VOLT(P_MUX1_1_1, 0) | |
647 | VADC_CHAN_VOLT(P_MUX2_1_1, 0) | |
648 | VADC_CHAN_VOLT(P_MUX3_1_1, 0) | |
649 | VADC_CHAN_VOLT(P_MUX4_1_1, 0) | |
650 | VADC_CHAN_VOLT(P_MUX5_1_1, 0) | |
651 | VADC_CHAN_VOLT(P_MUX6_1_1, 0) | |
652 | VADC_CHAN_VOLT(P_MUX7_1_1, 0) | |
653 | VADC_CHAN_VOLT(P_MUX8_1_1, 0) | |
654 | VADC_CHAN_VOLT(P_MUX9_1_1, 0) | |
655 | VADC_CHAN_VOLT(P_MUX10_1_1, 0) | |
656 | VADC_CHAN_VOLT(P_MUX11_1_1, 0) | |
657 | VADC_CHAN_VOLT(P_MUX12_1_1, 0) | |
658 | VADC_CHAN_VOLT(P_MUX13_1_1, 0) | |
659 | VADC_CHAN_VOLT(P_MUX14_1_1, 0) | |
660 | VADC_CHAN_VOLT(P_MUX15_1_1, 0) | |
661 | VADC_CHAN_VOLT(P_MUX16_1_1, 0) | |
662 | ||
663 | VADC_CHAN_VOLT(P_MUX1_1_3, 1) | |
664 | VADC_CHAN_VOLT(P_MUX2_1_3, 1) | |
665 | VADC_CHAN_VOLT(P_MUX3_1_3, 1) | |
666 | VADC_CHAN_VOLT(P_MUX4_1_3, 1) | |
667 | VADC_CHAN_VOLT(P_MUX5_1_3, 1) | |
668 | VADC_CHAN_VOLT(P_MUX6_1_3, 1) | |
669 | VADC_CHAN_VOLT(P_MUX7_1_3, 1) | |
670 | VADC_CHAN_VOLT(P_MUX8_1_3, 1) | |
671 | VADC_CHAN_VOLT(P_MUX9_1_3, 1) | |
672 | VADC_CHAN_VOLT(P_MUX10_1_3, 1) | |
673 | VADC_CHAN_VOLT(P_MUX11_1_3, 1) | |
674 | VADC_CHAN_VOLT(P_MUX12_1_3, 1) | |
675 | VADC_CHAN_VOLT(P_MUX13_1_3, 1) | |
676 | VADC_CHAN_VOLT(P_MUX14_1_3, 1) | |
677 | VADC_CHAN_VOLT(P_MUX15_1_3, 1) | |
678 | VADC_CHAN_VOLT(P_MUX16_1_3, 1) | |
679 | ||
680 | VADC_CHAN_VOLT(LR_MUX1_BAT_THERM, 0) | |
681 | VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0) | |
682 | VADC_CHAN_VOLT(LR_MUX3_XO_THERM, 0) | |
683 | VADC_CHAN_VOLT(LR_MUX4_AMUX_THM1, 0) | |
684 | VADC_CHAN_VOLT(LR_MUX5_AMUX_THM2, 0) | |
685 | VADC_CHAN_VOLT(LR_MUX6_AMUX_THM3, 0) | |
686 | VADC_CHAN_VOLT(LR_MUX7_HW_ID, 0) | |
687 | VADC_CHAN_VOLT(LR_MUX8_AMUX_THM4, 0) | |
688 | VADC_CHAN_VOLT(LR_MUX9_AMUX_THM5, 0) | |
689 | VADC_CHAN_VOLT(LR_MUX10_USB_ID, 0) | |
690 | VADC_CHAN_VOLT(AMUX_PU1, 0) | |
691 | VADC_CHAN_VOLT(AMUX_PU2, 0) | |
692 | VADC_CHAN_VOLT(LR_MUX3_BUF_XO_THERM, 0) | |
693 | ||
694 | VADC_CHAN_VOLT(LR_MUX1_PU1_BAT_THERM, 0) | |
695 | VADC_CHAN_VOLT(LR_MUX2_PU1_BAT_ID, 0) | |
696 | VADC_CHAN_VOLT(LR_MUX3_PU1_XO_THERM, 0) | |
697 | VADC_CHAN_VOLT(LR_MUX4_PU1_AMUX_THM1, 0) | |
698 | VADC_CHAN_VOLT(LR_MUX5_PU1_AMUX_THM2, 0) | |
699 | VADC_CHAN_VOLT(LR_MUX6_PU1_AMUX_THM3, 0) | |
700 | VADC_CHAN_VOLT(LR_MUX7_PU1_AMUX_HW_ID, 0) | |
701 | VADC_CHAN_VOLT(LR_MUX8_PU1_AMUX_THM4, 0) | |
702 | VADC_CHAN_VOLT(LR_MUX9_PU1_AMUX_THM5, 0) | |
703 | VADC_CHAN_VOLT(LR_MUX10_PU1_AMUX_USB_ID, 0) | |
704 | VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_XO_THERM, 0) | |
705 | ||
706 | VADC_CHAN_VOLT(LR_MUX1_PU2_BAT_THERM, 0) | |
707 | VADC_CHAN_VOLT(LR_MUX2_PU2_BAT_ID, 0) | |
708 | VADC_CHAN_VOLT(LR_MUX3_PU2_XO_THERM, 0) | |
709 | VADC_CHAN_VOLT(LR_MUX4_PU2_AMUX_THM1, 0) | |
710 | VADC_CHAN_VOLT(LR_MUX5_PU2_AMUX_THM2, 0) | |
711 | VADC_CHAN_VOLT(LR_MUX6_PU2_AMUX_THM3, 0) | |
712 | VADC_CHAN_VOLT(LR_MUX7_PU2_AMUX_HW_ID, 0) | |
713 | VADC_CHAN_VOLT(LR_MUX8_PU2_AMUX_THM4, 0) | |
714 | VADC_CHAN_VOLT(LR_MUX9_PU2_AMUX_THM5, 0) | |
715 | VADC_CHAN_VOLT(LR_MUX10_PU2_AMUX_USB_ID, 0) | |
716 | VADC_CHAN_VOLT(LR_MUX3_BUF_PU2_XO_THERM, 0) | |
717 | ||
718 | VADC_CHAN_VOLT(LR_MUX1_PU1_PU2_BAT_THERM, 0) | |
719 | VADC_CHAN_VOLT(LR_MUX2_PU1_PU2_BAT_ID, 0) | |
720 | VADC_CHAN_VOLT(LR_MUX3_PU1_PU2_XO_THERM, 0) | |
721 | VADC_CHAN_VOLT(LR_MUX4_PU1_PU2_AMUX_THM1, 0) | |
722 | VADC_CHAN_VOLT(LR_MUX5_PU1_PU2_AMUX_THM2, 0) | |
723 | VADC_CHAN_VOLT(LR_MUX6_PU1_PU2_AMUX_THM3, 0) | |
724 | VADC_CHAN_VOLT(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0) | |
725 | VADC_CHAN_VOLT(LR_MUX8_PU1_PU2_AMUX_THM4, 0) | |
726 | VADC_CHAN_VOLT(LR_MUX9_PU1_PU2_AMUX_THM5, 0) | |
727 | VADC_CHAN_VOLT(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0) | |
728 | VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0) | |
729 | }; | |
730 | ||
731 | static int vadc_get_dt_channel_data(struct device *dev, | |
732 | struct vadc_channel_prop *prop, | |
733 | struct device_node *node) | |
734 | { | |
735 | const char *name = node->name; | |
736 | u32 chan, value, varr[2]; | |
737 | int ret; | |
738 | ||
739 | ret = of_property_read_u32(node, "reg", &chan); | |
740 | if (ret) { | |
741 | dev_err(dev, "invalid channel number %s\n", name); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) { | |
746 | dev_err(dev, "%s invalid channel number %d\n", name, chan); | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | /* the channel has DT description */ | |
751 | prop->channel = chan; | |
752 | ||
753 | ret = of_property_read_u32(node, "qcom,decimation", &value); | |
754 | if (!ret) { | |
755 | ret = vadc_decimation_from_dt(value); | |
756 | if (ret < 0) { | |
757 | dev_err(dev, "%02x invalid decimation %d\n", | |
758 | chan, value); | |
759 | return ret; | |
760 | } | |
761 | prop->decimation = ret; | |
762 | } else { | |
763 | prop->decimation = VADC_DEF_DECIMATION; | |
764 | } | |
765 | ||
766 | ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2); | |
767 | if (!ret) { | |
768 | ret = vadc_prescaling_from_dt(varr[0], varr[1]); | |
769 | if (ret < 0) { | |
770 | dev_err(dev, "%02x invalid pre-scaling <%d %d>\n", | |
771 | chan, varr[0], varr[1]); | |
772 | return ret; | |
773 | } | |
774 | prop->prescale = ret; | |
775 | } else { | |
776 | prop->prescale = vadc_chans[prop->channel].prescale_index; | |
777 | } | |
778 | ||
779 | ret = of_property_read_u32(node, "qcom,hw-settle-time", &value); | |
780 | if (!ret) { | |
781 | ret = vadc_hw_settle_time_from_dt(value); | |
782 | if (ret < 0) { | |
783 | dev_err(dev, "%02x invalid hw-settle-time %d us\n", | |
784 | chan, value); | |
785 | return ret; | |
786 | } | |
787 | prop->hw_settle_time = ret; | |
788 | } else { | |
789 | prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME; | |
790 | } | |
791 | ||
792 | ret = of_property_read_u32(node, "qcom,avg-samples", &value); | |
793 | if (!ret) { | |
794 | ret = vadc_avg_samples_from_dt(value); | |
795 | if (ret < 0) { | |
796 | dev_err(dev, "%02x invalid avg-samples %d\n", | |
797 | chan, value); | |
798 | return ret; | |
799 | } | |
800 | prop->avg_samples = ret; | |
801 | } else { | |
802 | prop->avg_samples = VADC_DEF_AVG_SAMPLES; | |
803 | } | |
804 | ||
805 | if (of_property_read_bool(node, "qcom,ratiometric")) | |
806 | prop->calibration = VADC_CALIB_RATIOMETRIC; | |
807 | else | |
808 | prop->calibration = VADC_CALIB_ABSOLUTE; | |
809 | ||
810 | dev_dbg(dev, "%02x name %s\n", chan, name); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node) | |
816 | { | |
817 | const struct vadc_channels *vadc_chan; | |
818 | struct iio_chan_spec *iio_chan; | |
819 | struct vadc_channel_prop prop; | |
820 | struct device_node *child; | |
821 | unsigned int index = 0; | |
822 | int ret; | |
823 | ||
824 | vadc->nchannels = of_get_available_child_count(node); | |
825 | if (!vadc->nchannels) | |
826 | return -EINVAL; | |
827 | ||
828 | vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels, | |
829 | sizeof(*vadc->iio_chans), GFP_KERNEL); | |
830 | if (!vadc->iio_chans) | |
831 | return -ENOMEM; | |
832 | ||
833 | vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels, | |
834 | sizeof(*vadc->chan_props), GFP_KERNEL); | |
835 | if (!vadc->chan_props) | |
836 | return -ENOMEM; | |
837 | ||
838 | iio_chan = vadc->iio_chans; | |
839 | ||
840 | for_each_available_child_of_node(node, child) { | |
841 | ret = vadc_get_dt_channel_data(vadc->dev, &prop, child); | |
d4c65fe4 JL |
842 | if (ret) { |
843 | of_node_put(child); | |
0917de94 | 844 | return ret; |
d4c65fe4 | 845 | } |
0917de94 SV |
846 | |
847 | vadc->chan_props[index] = prop; | |
848 | ||
849 | vadc_chan = &vadc_chans[prop.channel]; | |
850 | ||
851 | iio_chan->channel = prop.channel; | |
852 | iio_chan->datasheet_name = vadc_chan->datasheet_name; | |
853 | iio_chan->info_mask_separate = vadc_chan->info_mask; | |
854 | iio_chan->type = vadc_chan->type; | |
855 | iio_chan->indexed = 1; | |
856 | iio_chan->address = index++; | |
857 | ||
858 | iio_chan++; | |
859 | } | |
860 | ||
861 | /* These channels are mandatory, they are used as reference points */ | |
862 | if (!vadc_get_channel(vadc, VADC_REF_1250MV)) { | |
863 | dev_err(vadc->dev, "Please define 1.25V channel\n"); | |
864 | return -ENODEV; | |
865 | } | |
866 | ||
867 | if (!vadc_get_channel(vadc, VADC_REF_625MV)) { | |
868 | dev_err(vadc->dev, "Please define 0.625V channel\n"); | |
869 | return -ENODEV; | |
870 | } | |
871 | ||
872 | if (!vadc_get_channel(vadc, VADC_VDD_VADC)) { | |
873 | dev_err(vadc->dev, "Please define VDD channel\n"); | |
874 | return -ENODEV; | |
875 | } | |
876 | ||
877 | if (!vadc_get_channel(vadc, VADC_GND_REF)) { | |
878 | dev_err(vadc->dev, "Please define GND channel\n"); | |
879 | return -ENODEV; | |
880 | } | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | static irqreturn_t vadc_isr(int irq, void *dev_id) | |
886 | { | |
887 | struct vadc_priv *vadc = dev_id; | |
888 | ||
889 | complete(&vadc->complete); | |
890 | ||
891 | return IRQ_HANDLED; | |
892 | } | |
893 | ||
894 | static int vadc_check_revision(struct vadc_priv *vadc) | |
895 | { | |
896 | u8 val; | |
897 | int ret; | |
898 | ||
899 | ret = vadc_read(vadc, VADC_PERPH_TYPE, &val); | |
900 | if (ret) | |
901 | return ret; | |
902 | ||
903 | if (val < VADC_PERPH_TYPE_ADC) { | |
904 | dev_err(vadc->dev, "%d is not ADC\n", val); | |
905 | return -ENODEV; | |
906 | } | |
907 | ||
908 | ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val); | |
909 | if (ret) | |
910 | return ret; | |
911 | ||
912 | if (val < VADC_PERPH_SUBTYPE_VADC) { | |
913 | dev_err(vadc->dev, "%d is not VADC\n", val); | |
914 | return -ENODEV; | |
915 | } | |
916 | ||
917 | ret = vadc_read(vadc, VADC_REVISION2, &val); | |
918 | if (ret) | |
919 | return ret; | |
920 | ||
921 | if (val < VADC_REVISION2_SUPPORTED_VADC) { | |
922 | dev_err(vadc->dev, "revision %d not supported\n", val); | |
923 | return -ENODEV; | |
924 | } | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | static int vadc_probe(struct platform_device *pdev) | |
930 | { | |
931 | struct device_node *node = pdev->dev.of_node; | |
932 | struct device *dev = &pdev->dev; | |
933 | struct iio_dev *indio_dev; | |
934 | struct vadc_priv *vadc; | |
935 | struct regmap *regmap; | |
936 | int ret, irq_eoc; | |
937 | u32 reg; | |
938 | ||
939 | regmap = dev_get_regmap(dev->parent, NULL); | |
940 | if (!regmap) | |
941 | return -ENODEV; | |
942 | ||
943 | ret = of_property_read_u32(node, "reg", ®); | |
944 | if (ret < 0) | |
945 | return ret; | |
946 | ||
947 | indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc)); | |
948 | if (!indio_dev) | |
949 | return -ENOMEM; | |
950 | ||
951 | vadc = iio_priv(indio_dev); | |
952 | vadc->regmap = regmap; | |
953 | vadc->dev = dev; | |
954 | vadc->base = reg; | |
955 | vadc->are_ref_measured = false; | |
956 | init_completion(&vadc->complete); | |
957 | mutex_init(&vadc->lock); | |
958 | ||
959 | ret = vadc_check_revision(vadc); | |
960 | if (ret) | |
961 | return ret; | |
962 | ||
963 | ret = vadc_get_dt_data(vadc, node); | |
964 | if (ret) | |
965 | return ret; | |
966 | ||
967 | irq_eoc = platform_get_irq(pdev, 0); | |
968 | if (irq_eoc < 0) { | |
969 | if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL) | |
970 | return irq_eoc; | |
971 | vadc->poll_eoc = true; | |
972 | } else { | |
973 | ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0, | |
974 | "spmi-vadc", vadc); | |
975 | if (ret) | |
976 | return ret; | |
977 | } | |
978 | ||
979 | ret = vadc_reset(vadc); | |
980 | if (ret) { | |
981 | dev_err(dev, "reset failed\n"); | |
982 | return ret; | |
983 | } | |
984 | ||
985 | ret = vadc_measure_ref_points(vadc); | |
986 | if (ret) | |
987 | return ret; | |
988 | ||
989 | indio_dev->dev.parent = dev; | |
990 | indio_dev->dev.of_node = node; | |
991 | indio_dev->name = pdev->name; | |
992 | indio_dev->modes = INDIO_DIRECT_MODE; | |
993 | indio_dev->info = &vadc_info; | |
994 | indio_dev->channels = vadc->iio_chans; | |
995 | indio_dev->num_channels = vadc->nchannels; | |
996 | ||
997 | return devm_iio_device_register(dev, indio_dev); | |
998 | } | |
999 | ||
1000 | static const struct of_device_id vadc_match_table[] = { | |
1001 | { .compatible = "qcom,spmi-vadc" }, | |
1002 | { } | |
1003 | }; | |
1004 | MODULE_DEVICE_TABLE(of, vadc_match_table); | |
1005 | ||
1006 | static struct platform_driver vadc_driver = { | |
1007 | .driver = { | |
1008 | .name = "qcom-spmi-vadc", | |
1009 | .of_match_table = vadc_match_table, | |
1010 | }, | |
1011 | .probe = vadc_probe, | |
1012 | }; | |
1013 | module_platform_driver(vadc_driver); | |
1014 | ||
1015 | MODULE_ALIAS("platform:qcom-spmi-vadc"); | |
1016 | MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver"); | |
1017 | MODULE_LICENSE("GPL v2"); | |
1018 | MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>"); | |
1019 | MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>"); |