1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2020 Linaro Limited
4 *
5 * Based on original driver:
6 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
7 *
8 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
9 */
10
11 #include <linux/bitfield.h>
12 #include <linux/iio/adc/qcom-vadc-common.h>
13 #include <linux/iio/consumer.h>
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/thermal.h>
20
21 #include <asm/unaligned.h>
22
23 #include "../thermal_hwmon.h"
24
25 /*
26 * Thermal monitoring block consists of 8 (ADC_TM5_NUM_CHANNELS) channels. Each
27 * channel is programmed to use one of ADC channels for voltage comparison.
28 * Voltages are programmed using ADC codes, so we have to convert temp to
29 * voltage and then to ADC code value.
30 *
31 * Configuration of TM channels must match configuration of corresponding ADC
32 * channels.
33 */
34
35 #define ADC5_MAX_CHANNEL 0xc0
36 #define ADC_TM5_NUM_CHANNELS 8
37
38 #define ADC_TM5_STATUS_LOW 0x0a
39
40 #define ADC_TM5_STATUS_HIGH 0x0b
41
42 #define ADC_TM5_NUM_BTM 0x0f
43
44 #define ADC_TM5_ADC_DIG_PARAM 0x42
45
46 #define ADC_TM5_FAST_AVG_CTL (ADC_TM5_ADC_DIG_PARAM + 1)
47 #define ADC_TM5_FAST_AVG_EN BIT(7)
48
49 #define ADC_TM5_MEAS_INTERVAL_CTL (ADC_TM5_ADC_DIG_PARAM + 2)
50 #define ADC_TM5_TIMER1 3 /* 3.9ms */
51
52 #define ADC_TM5_MEAS_INTERVAL_CTL2 (ADC_TM5_ADC_DIG_PARAM + 3)
53 #define ADC_TM5_MEAS_INTERVAL_CTL2_MASK 0xf0
54 #define ADC_TM5_TIMER2 10 /* 1 second */
55 #define ADC_TM5_MEAS_INTERVAL_CTL3_MASK 0xf
56 #define ADC_TM5_TIMER3 4 /* 4 second */
57
58 #define ADC_TM_EN_CTL1 0x46
59 #define ADC_TM_EN BIT(7)
60 #define ADC_TM_CONV_REQ 0x47
61 #define ADC_TM_CONV_REQ_EN BIT(7)
62
63 #define ADC_TM5_M_CHAN_BASE 0x60
64
65 #define ADC_TM5_M_ADC_CH_SEL_CTL(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 0)
66 #define ADC_TM5_M_LOW_THR0(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 1)
67 #define ADC_TM5_M_LOW_THR1(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 2)
68 #define ADC_TM5_M_HIGH_THR0(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 3)
69 #define ADC_TM5_M_HIGH_THR1(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 4)
70 #define ADC_TM5_M_MEAS_INTERVAL_CTL(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 5)
71 #define ADC_TM5_M_CTL(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 6)
72 #define ADC_TM5_M_CTL_HW_SETTLE_DELAY_MASK 0xf
73 #define ADC_TM5_M_CTL_CAL_SEL_MASK 0x30
74 #define ADC_TM5_M_CTL_CAL_VAL 0x40
75 #define ADC_TM5_M_EN(n) (ADC_TM5_M_CHAN_BASE + ((n) * 8) + 7)
76 #define ADC_TM5_M_MEAS_EN BIT(7)
77 #define ADC_TM5_M_HIGH_THR_INT_EN BIT(1)
78 #define ADC_TM5_M_LOW_THR_INT_EN BIT(0)
79
80 #define ADC_TM_GEN2_STATUS1 0x08
81 #define ADC_TM_GEN2_STATUS_LOW_SET 0x09
82 #define ADC_TM_GEN2_STATUS_LOW_CLR 0x0a
83 #define ADC_TM_GEN2_STATUS_HIGH_SET 0x0b
84 #define ADC_TM_GEN2_STATUS_HIGH_CLR 0x0c
85
86 #define ADC_TM_GEN2_CFG_HS_SET 0x0d
87 #define ADC_TM_GEN2_CFG_HS_FLAG BIT(0)
88 #define ADC_TM_GEN2_CFG_HS_CLR 0x0e
89
90 #define ADC_TM_GEN2_SID 0x40
91
92 #define ADC_TM_GEN2_CH_CTL 0x41
93 #define ADC_TM_GEN2_TM_CH_SEL GENMASK(7, 5)
94 #define ADC_TM_GEN2_MEAS_INT_SEL GENMASK(3, 2)
95
96 #define ADC_TM_GEN2_ADC_DIG_PARAM 0x42
97 #define ADC_TM_GEN2_CTL_CAL_SEL GENMASK(5, 4)
98 #define ADC_TM_GEN2_CTL_DEC_RATIO_MASK GENMASK(3, 2)
99
100 #define ADC_TM_GEN2_FAST_AVG_CTL 0x43
101 #define ADC_TM_GEN2_FAST_AVG_EN BIT(7)
102
103 #define ADC_TM_GEN2_ADC_CH_SEL_CTL 0x44
104
105 #define ADC_TM_GEN2_DELAY_CTL 0x45
106 #define ADC_TM_GEN2_HW_SETTLE_DELAY GENMASK(3, 0)
107
108 #define ADC_TM_GEN2_EN_CTL1 0x46
109 #define ADC_TM_GEN2_EN BIT(7)
110
111 #define ADC_TM_GEN2_CONV_REQ 0x47
112 #define ADC_TM_GEN2_CONV_REQ_EN BIT(7)
113
114 #define ADC_TM_GEN2_LOW_THR0 0x49
115 #define ADC_TM_GEN2_LOW_THR1 0x4a
116 #define ADC_TM_GEN2_HIGH_THR0 0x4b
117 #define ADC_TM_GEN2_HIGH_THR1 0x4c
118 #define ADC_TM_GEN2_LOWER_MASK(n) ((n) & GENMASK(7, 0))
119 #define ADC_TM_GEN2_UPPER_MASK(n) (((n) & GENMASK(15, 8)) >> 8)
120
121 #define ADC_TM_GEN2_MEAS_IRQ_EN 0x4d
122 #define ADC_TM_GEN2_MEAS_EN BIT(7)
123 #define ADC_TM5_GEN2_HIGH_THR_INT_EN BIT(1)
124 #define ADC_TM5_GEN2_LOW_THR_INT_EN BIT(0)
125
126 #define ADC_TM_GEN2_MEAS_INT_LSB 0x50
127 #define ADC_TM_GEN2_MEAS_INT_MSB 0x51
128 #define ADC_TM_GEN2_MEAS_INT_MODE 0x52
129
130 #define ADC_TM_GEN2_Mn_DATA0(n) ((n * 2) + 0xa0)
131 #define ADC_TM_GEN2_Mn_DATA1(n) ((n * 2) + 0xa1)
132 #define ADC_TM_GEN2_DATA_SHIFT 8
133
134 enum adc5_timer_select {
135 ADC5_TIMER_SEL_1 = 0,
136 ADC5_TIMER_SEL_2,
137 ADC5_TIMER_SEL_3,
138 ADC5_TIMER_SEL_NONE,
139 };
140
141 enum adc5_gen {
142 ADC_TM5,
143 ADC_TM_HC,
144 ADC_TM5_GEN2,
145 ADC_TM5_MAX
146 };
147
148 enum adc_tm5_cal_method {
149 ADC_TM5_NO_CAL = 0,
150 ADC_TM5_RATIOMETRIC_CAL,
151 ADC_TM5_ABSOLUTE_CAL
152 };
153
154 enum adc_tm_gen2_time_select {
155 MEAS_INT_50MS = 0,
156 MEAS_INT_100MS,
157 MEAS_INT_1S,
158 MEAS_INT_SET,
159 MEAS_INT_NONE,
160 };
161
162 struct adc_tm5_chip;
163 struct adc_tm5_channel;
164
165 struct adc_tm5_data {
166 const u32 full_scale_code_volt;
167 unsigned int *decimation;
168 unsigned int *hw_settle;
169 int (*disable_channel)(struct adc_tm5_channel *channel);
170 int (*configure)(struct adc_tm5_channel *channel, int low, int high);
171 irqreturn_t (*isr)(int irq, void *data);
172 int (*init)(struct adc_tm5_chip *chip);
173 char *irq_name;
174 int gen;
175 };
176
177 /**
178 * struct adc_tm5_channel - ADC Thermal Monitoring channel data.
179 * @channel: channel number.
180 * @adc_channel: corresponding ADC channel number.
181 * @cal_method: calibration method.
182 * @prescale: channel scaling performed on the input signal.
183 * @hw_settle_time: the time between AMUX being configured and the
184 * start of conversion.
185 * @decimation: sampling rate supported for the channel.
186 * @avg_samples: ability to provide single result from the ADC
187 * that is an average of multiple measurements.
188 * @high_thr_en: channel upper voltage threshold enable state.
189 * @low_thr_en: channel lower voltage threshold enable state.
190 * @meas_en: recurring measurement enable state
191 * @iio: IIO channel instance used by this channel.
192 * @chip: ADC TM chip instance.
193 * @tzd: thermal zone device used by this channel.
194 */
195 struct adc_tm5_channel {
196 unsigned int channel;
197 unsigned int adc_channel;
198 enum adc_tm5_cal_method cal_method;
199 unsigned int prescale;
200 unsigned int hw_settle_time;
201 unsigned int decimation; /* For Gen2 ADC_TM */
202 unsigned int avg_samples; /* For Gen2 ADC_TM */
203 bool high_thr_en; /* For Gen2 ADC_TM */
204 bool low_thr_en; /* For Gen2 ADC_TM */
205 bool meas_en; /* For Gen2 ADC_TM */
206 struct iio_channel *iio;
207 struct adc_tm5_chip *chip;
208 struct thermal_zone_device *tzd;
209 };
210
211 /**
212 * struct adc_tm5_chip - ADC Thermal Monitoring properties
213 * @regmap: SPMI ADC5 Thermal Monitoring peripheral register map field.
214 * @dev: SPMI ADC5 device.
215 * @data: software configuration data.
216 * @channels: array of ADC TM channel data.
217 * @nchannels: amount of channels defined/allocated
218 * @decimation: sampling rate supported for the channel.
219 * Applies to all channels, used only on Gen1 ADC_TM.
220 * @avg_samples: ability to provide single result from the ADC
221 * that is an average of multiple measurements. Applies to all
222 * channels, used only on Gen1 ADC_TM.
223 * @base: base address of TM registers.
224 * @adc_mutex_lock: ADC_TM mutex lock, used only on Gen2 ADC_TM.
225 * It is used to ensure only one ADC channel configuration
226 * is done at a time using the shared set of configuration
227 * registers.
228 */
229 struct adc_tm5_chip {
230 struct regmap *regmap;
231 struct device *dev;
232 const struct adc_tm5_data *data;
233 struct adc_tm5_channel *channels;
234 unsigned int nchannels;
235 unsigned int decimation;
236 unsigned int avg_samples;
237 u16 base;
238 struct mutex adc_mutex_lock;
239 };
240
adc_tm5_read(struct adc_tm5_chip * adc_tm,u16 offset,u8 * data,int len)241 static int adc_tm5_read(struct adc_tm5_chip *adc_tm, u16 offset, u8 *data, int len)
242 {
243 return regmap_bulk_read(adc_tm->regmap, adc_tm->base + offset, data, len);
244 }
245
adc_tm5_write(struct adc_tm5_chip * adc_tm,u16 offset,u8 * data,int len)246 static int adc_tm5_write(struct adc_tm5_chip *adc_tm, u16 offset, u8 *data, int len)
247 {
248 return regmap_bulk_write(adc_tm->regmap, adc_tm->base + offset, data, len);
249 }
250
adc_tm5_reg_update(struct adc_tm5_chip * adc_tm,u16 offset,u8 mask,u8 val)251 static int adc_tm5_reg_update(struct adc_tm5_chip *adc_tm, u16 offset, u8 mask, u8 val)
252 {
253 return regmap_write_bits(adc_tm->regmap, adc_tm->base + offset, mask, val);
254 }
255
adc_tm5_isr(int irq,void * data)256 static irqreturn_t adc_tm5_isr(int irq, void *data)
257 {
258 struct adc_tm5_chip *chip = data;
259 u8 status_low, status_high, ctl;
260 int ret, i;
261
262 ret = adc_tm5_read(chip, ADC_TM5_STATUS_LOW, &status_low, sizeof(status_low));
263 if (unlikely(ret)) {
264 dev_err(chip->dev, "read status low failed: %d\n", ret);
265 return IRQ_HANDLED;
266 }
267
268 ret = adc_tm5_read(chip, ADC_TM5_STATUS_HIGH, &status_high, sizeof(status_high));
269 if (unlikely(ret)) {
270 dev_err(chip->dev, "read status high failed: %d\n", ret);
271 return IRQ_HANDLED;
272 }
273
274 for (i = 0; i < chip->nchannels; i++) {
275 bool upper_set = false, lower_set = false;
276 unsigned int ch = chip->channels[i].channel;
277
278 /* No TZD, we warned at the boot time */
279 if (!chip->channels[i].tzd)
280 continue;
281
282 ret = adc_tm5_read(chip, ADC_TM5_M_EN(ch), &ctl, sizeof(ctl));
283 if (unlikely(ret)) {
284 dev_err(chip->dev, "ctl read failed: %d, channel %d\n", ret, i);
285 continue;
286 }
287
288 if (!(ctl & ADC_TM5_M_MEAS_EN))
289 continue;
290
291 lower_set = (status_low & BIT(ch)) &&
292 (ctl & ADC_TM5_M_LOW_THR_INT_EN);
293
294 upper_set = (status_high & BIT(ch)) &&
295 (ctl & ADC_TM5_M_HIGH_THR_INT_EN);
296
297 if (upper_set || lower_set)
298 thermal_zone_device_update(chip->channels[i].tzd,
299 THERMAL_EVENT_UNSPECIFIED);
300 }
301
302 return IRQ_HANDLED;
303 }
304
adc_tm5_gen2_isr(int irq,void * data)305 static irqreturn_t adc_tm5_gen2_isr(int irq, void *data)
306 {
307 struct adc_tm5_chip *chip = data;
308 u8 status_low, status_high;
309 int ret, i;
310
311 ret = adc_tm5_read(chip, ADC_TM_GEN2_STATUS_LOW_CLR, &status_low, sizeof(status_low));
312 if (ret) {
313 dev_err(chip->dev, "read status_low failed: %d\n", ret);
314 return IRQ_HANDLED;
315 }
316
317 ret = adc_tm5_read(chip, ADC_TM_GEN2_STATUS_HIGH_CLR, &status_high, sizeof(status_high));
318 if (ret) {
319 dev_err(chip->dev, "read status_high failed: %d\n", ret);
320 return IRQ_HANDLED;
321 }
322
323 ret = adc_tm5_write(chip, ADC_TM_GEN2_STATUS_LOW_CLR, &status_low, sizeof(status_low));
324 if (ret < 0) {
325 dev_err(chip->dev, "clear status low failed with %d\n", ret);
326 return IRQ_HANDLED;
327 }
328
329 ret = adc_tm5_write(chip, ADC_TM_GEN2_STATUS_HIGH_CLR, &status_high, sizeof(status_high));
330 if (ret < 0) {
331 dev_err(chip->dev, "clear status high failed with %d\n", ret);
332 return IRQ_HANDLED;
333 }
334
335 for (i = 0; i < chip->nchannels; i++) {
336 bool upper_set = false, lower_set = false;
337 unsigned int ch = chip->channels[i].channel;
338
339 /* No TZD, we warned at the boot time */
340 if (!chip->channels[i].tzd)
341 continue;
342
343 if (!chip->channels[i].meas_en)
344 continue;
345
346 lower_set = (status_low & BIT(ch)) &&
347 (chip->channels[i].low_thr_en);
348
349 upper_set = (status_high & BIT(ch)) &&
350 (chip->channels[i].high_thr_en);
351
352 if (upper_set || lower_set)
353 thermal_zone_device_update(chip->channels[i].tzd,
354 THERMAL_EVENT_UNSPECIFIED);
355 }
356
357 return IRQ_HANDLED;
358 }
359
adc_tm5_get_temp(struct thermal_zone_device * tz,int * temp)360 static int adc_tm5_get_temp(struct thermal_zone_device *tz, int *temp)
361 {
362 struct adc_tm5_channel *channel = thermal_zone_device_priv(tz);
363 int ret;
364
365 if (!channel || !channel->iio)
366 return -EINVAL;
367
368 ret = iio_read_channel_processed(channel->iio, temp);
369 if (ret < 0)
370 return ret;
371
372 if (ret != IIO_VAL_INT)
373 return -EINVAL;
374
375 return 0;
376 }
377
adc_tm5_disable_channel(struct adc_tm5_channel * channel)378 static int adc_tm5_disable_channel(struct adc_tm5_channel *channel)
379 {
380 struct adc_tm5_chip *chip = channel->chip;
381 unsigned int reg = ADC_TM5_M_EN(channel->channel);
382
383 return adc_tm5_reg_update(chip, reg,
384 ADC_TM5_M_MEAS_EN |
385 ADC_TM5_M_HIGH_THR_INT_EN |
386 ADC_TM5_M_LOW_THR_INT_EN,
387 0);
388 }
389
390 #define ADC_TM_GEN2_POLL_DELAY_MIN_US 100
391 #define ADC_TM_GEN2_POLL_DELAY_MAX_US 110
392 #define ADC_TM_GEN2_POLL_RETRY_COUNT 3
393
adc_tm5_gen2_conv_req(struct adc_tm5_chip * chip)394 static int32_t adc_tm5_gen2_conv_req(struct adc_tm5_chip *chip)
395 {
396 int ret;
397 u8 data;
398 unsigned int count;
399
400 data = ADC_TM_GEN2_EN;
401 ret = adc_tm5_write(chip, ADC_TM_GEN2_EN_CTL1, &data, 1);
402 if (ret < 0) {
403 dev_err(chip->dev, "adc-tm enable failed with %d\n", ret);
404 return ret;
405 }
406
407 data = ADC_TM_GEN2_CFG_HS_FLAG;
408 ret = adc_tm5_write(chip, ADC_TM_GEN2_CFG_HS_SET, &data, 1);
409 if (ret < 0) {
410 dev_err(chip->dev, "adc-tm handshake failed with %d\n", ret);
411 return ret;
412 }
413
414 data = ADC_TM_GEN2_CONV_REQ_EN;
415 ret = adc_tm5_write(chip, ADC_TM_GEN2_CONV_REQ, &data, 1);
416 if (ret < 0) {
417 dev_err(chip->dev, "adc-tm request conversion failed with %d\n", ret);
418 return ret;
419 }
420
421 /*
422 * SW sets a handshake bit and waits for PBS to clear it
423 * before the next conversion request can be queued.
424 */
425
426 for (count = 0; count < ADC_TM_GEN2_POLL_RETRY_COUNT; count++) {
427 ret = adc_tm5_read(chip, ADC_TM_GEN2_CFG_HS_SET, &data, sizeof(data));
428 if (ret < 0) {
429 dev_err(chip->dev, "adc-tm read failed with %d\n", ret);
430 return ret;
431 }
432
433 if (!(data & ADC_TM_GEN2_CFG_HS_FLAG))
434 return ret;
435 usleep_range(ADC_TM_GEN2_POLL_DELAY_MIN_US,
436 ADC_TM_GEN2_POLL_DELAY_MAX_US);
437 }
438
439 dev_err(chip->dev, "adc-tm conversion request handshake timed out\n");
440
441 return -ETIMEDOUT;
442 }
443
adc_tm5_gen2_disable_channel(struct adc_tm5_channel * channel)444 static int adc_tm5_gen2_disable_channel(struct adc_tm5_channel *channel)
445 {
446 struct adc_tm5_chip *chip = channel->chip;
447 int ret;
448 u8 val;
449
450 mutex_lock(&chip->adc_mutex_lock);
451
452 channel->meas_en = false;
453 channel->high_thr_en = false;
454 channel->low_thr_en = false;
455
456 ret = adc_tm5_read(chip, ADC_TM_GEN2_CH_CTL, &val, sizeof(val));
457 if (ret < 0) {
458 dev_err(chip->dev, "adc-tm block read failed with %d\n", ret);
459 goto disable_fail;
460 }
461
462 val &= ~ADC_TM_GEN2_TM_CH_SEL;
463 val |= FIELD_PREP(ADC_TM_GEN2_TM_CH_SEL, channel->channel);
464
465 ret = adc_tm5_write(chip, ADC_TM_GEN2_CH_CTL, &val, 1);
466 if (ret < 0) {
467 dev_err(chip->dev, "adc-tm channel disable failed with %d\n", ret);
468 goto disable_fail;
469 }
470
471 val = 0;
472 ret = adc_tm5_write(chip, ADC_TM_GEN2_MEAS_IRQ_EN, &val, 1);
473 if (ret < 0) {
474 dev_err(chip->dev, "adc-tm interrupt disable failed with %d\n", ret);
475 goto disable_fail;
476 }
477
478
479 ret = adc_tm5_gen2_conv_req(channel->chip);
480 if (ret < 0)
481 dev_err(chip->dev, "adc-tm channel configure failed with %d\n", ret);
482
483 disable_fail:
484 mutex_unlock(&chip->adc_mutex_lock);
485 return ret;
486 }
487
adc_tm5_enable(struct adc_tm5_chip * chip)488 static int adc_tm5_enable(struct adc_tm5_chip *chip)
489 {
490 int ret;
491 u8 data;
492
493 data = ADC_TM_EN;
494 ret = adc_tm5_write(chip, ADC_TM_EN_CTL1, &data, sizeof(data));
495 if (ret < 0) {
496 dev_err(chip->dev, "adc-tm enable failed\n");
497 return ret;
498 }
499
500 data = ADC_TM_CONV_REQ_EN;
501 ret = adc_tm5_write(chip, ADC_TM_CONV_REQ, &data, sizeof(data));
502 if (ret < 0) {
503 dev_err(chip->dev, "adc-tm request conversion failed\n");
504 return ret;
505 }
506
507 return 0;
508 }
509
adc_tm5_configure(struct adc_tm5_channel * channel,int low,int high)510 static int adc_tm5_configure(struct adc_tm5_channel *channel, int low, int high)
511 {
512 struct adc_tm5_chip *chip = channel->chip;
513 u8 buf[8];
514 u16 reg = ADC_TM5_M_ADC_CH_SEL_CTL(channel->channel);
515 int ret;
516
517 ret = adc_tm5_read(chip, reg, buf, sizeof(buf));
518 if (ret) {
519 dev_err(chip->dev, "channel %d params read failed: %d\n", channel->channel, ret);
520 return ret;
521 }
522
523 buf[0] = channel->adc_channel;
524
525 /* High temperature corresponds to low voltage threshold */
526 if (high != INT_MAX) {
527 u16 adc_code = qcom_adc_tm5_temp_volt_scale(channel->prescale,
528 chip->data->full_scale_code_volt, high);
529
530 put_unaligned_le16(adc_code, &buf[1]);
531 buf[7] |= ADC_TM5_M_LOW_THR_INT_EN;
532 } else {
533 buf[7] &= ~ADC_TM5_M_LOW_THR_INT_EN;
534 }
535
536 /* Low temperature corresponds to high voltage threshold */
537 if (low != -INT_MAX) {
538 u16 adc_code = qcom_adc_tm5_temp_volt_scale(channel->prescale,
539 chip->data->full_scale_code_volt, low);
540
541 put_unaligned_le16(adc_code, &buf[3]);
542 buf[7] |= ADC_TM5_M_HIGH_THR_INT_EN;
543 } else {
544 buf[7] &= ~ADC_TM5_M_HIGH_THR_INT_EN;
545 }
546
547 buf[5] = ADC5_TIMER_SEL_2;
548
549 /* Set calibration select, hw_settle delay */
550 buf[6] &= ~ADC_TM5_M_CTL_HW_SETTLE_DELAY_MASK;
551 buf[6] |= FIELD_PREP(ADC_TM5_M_CTL_HW_SETTLE_DELAY_MASK, channel->hw_settle_time);
552 buf[6] &= ~ADC_TM5_M_CTL_CAL_SEL_MASK;
553 buf[6] |= FIELD_PREP(ADC_TM5_M_CTL_CAL_SEL_MASK, channel->cal_method);
554
555 buf[7] |= ADC_TM5_M_MEAS_EN;
556
557 ret = adc_tm5_write(chip, reg, buf, sizeof(buf));
558 if (ret) {
559 dev_err(chip->dev, "channel %d params write failed: %d\n", channel->channel, ret);
560 return ret;
561 }
562
563 return adc_tm5_enable(chip);
564 }
565
adc_tm5_gen2_configure(struct adc_tm5_channel * channel,int low,int high)566 static int adc_tm5_gen2_configure(struct adc_tm5_channel *channel, int low, int high)
567 {
568 struct adc_tm5_chip *chip = channel->chip;
569 int ret;
570 u8 buf[14];
571 u16 adc_code;
572
573 mutex_lock(&chip->adc_mutex_lock);
574
575 channel->meas_en = true;
576
577 ret = adc_tm5_read(chip, ADC_TM_GEN2_SID, buf, sizeof(buf));
578 if (ret < 0) {
579 dev_err(chip->dev, "adc-tm block read failed with %d\n", ret);
580 goto config_fail;
581 }
582
583 /* Set SID from virtual channel number */
584 buf[0] = channel->adc_channel >> 8;
585
586 /* Set TM channel number used and measurement interval */
587 buf[1] &= ~ADC_TM_GEN2_TM_CH_SEL;
588 buf[1] |= FIELD_PREP(ADC_TM_GEN2_TM_CH_SEL, channel->channel);
589 buf[1] &= ~ADC_TM_GEN2_MEAS_INT_SEL;
590 buf[1] |= FIELD_PREP(ADC_TM_GEN2_MEAS_INT_SEL, MEAS_INT_1S);
591
592 buf[2] &= ~ADC_TM_GEN2_CTL_DEC_RATIO_MASK;
593 buf[2] |= FIELD_PREP(ADC_TM_GEN2_CTL_DEC_RATIO_MASK, channel->decimation);
594 buf[2] &= ~ADC_TM_GEN2_CTL_CAL_SEL;
595 buf[2] |= FIELD_PREP(ADC_TM_GEN2_CTL_CAL_SEL, channel->cal_method);
596
597 buf[3] = channel->avg_samples | ADC_TM_GEN2_FAST_AVG_EN;
598
599 buf[4] = channel->adc_channel & 0xff;
600
601 buf[5] = channel->hw_settle_time & ADC_TM_GEN2_HW_SETTLE_DELAY;
602
603 /* High temperature corresponds to low voltage threshold */
604 if (high != INT_MAX) {
605 channel->low_thr_en = true;
606 adc_code = qcom_adc_tm5_gen2_temp_res_scale(high);
607 put_unaligned_le16(adc_code, &buf[9]);
608 } else {
609 channel->low_thr_en = false;
610 }
611
612 /* Low temperature corresponds to high voltage threshold */
613 if (low != -INT_MAX) {
614 channel->high_thr_en = true;
615 adc_code = qcom_adc_tm5_gen2_temp_res_scale(low);
616 put_unaligned_le16(adc_code, &buf[11]);
617 } else {
618 channel->high_thr_en = false;
619 }
620
621 buf[13] = ADC_TM_GEN2_MEAS_EN;
622 if (channel->high_thr_en)
623 buf[13] |= ADC_TM5_GEN2_HIGH_THR_INT_EN;
624 if (channel->low_thr_en)
625 buf[13] |= ADC_TM5_GEN2_LOW_THR_INT_EN;
626
627 ret = adc_tm5_write(chip, ADC_TM_GEN2_SID, buf, sizeof(buf));
628 if (ret) {
629 dev_err(chip->dev, "channel %d params write failed: %d\n", channel->channel, ret);
630 goto config_fail;
631 }
632
633 ret = adc_tm5_gen2_conv_req(channel->chip);
634 if (ret < 0)
635 dev_err(chip->dev, "adc-tm channel configure failed with %d\n", ret);
636
637 config_fail:
638 mutex_unlock(&chip->adc_mutex_lock);
639 return ret;
640 }
641
adc_tm5_set_trips(struct thermal_zone_device * tz,int low,int high)642 static int adc_tm5_set_trips(struct thermal_zone_device *tz, int low, int high)
643 {
644 struct adc_tm5_channel *channel = thermal_zone_device_priv(tz);
645 struct adc_tm5_chip *chip;
646 int ret;
647
648 if (!channel)
649 return -EINVAL;
650
651 chip = channel->chip;
652 dev_dbg(chip->dev, "%d:low(mdegC):%d, high(mdegC):%d\n",
653 channel->channel, low, high);
654
655 if (high == INT_MAX && low <= -INT_MAX)
656 ret = chip->data->disable_channel(channel);
657 else
658 ret = chip->data->configure(channel, low, high);
659
660 return ret;
661 }
662
663 static const struct thermal_zone_device_ops adc_tm5_thermal_ops = {
664 .get_temp = adc_tm5_get_temp,
665 .set_trips = adc_tm5_set_trips,
666 };
667
adc_tm5_register_tzd(struct adc_tm5_chip * adc_tm)668 static int adc_tm5_register_tzd(struct adc_tm5_chip *adc_tm)
669 {
670 unsigned int i;
671 struct thermal_zone_device *tzd;
672
673 for (i = 0; i < adc_tm->nchannels; i++) {
674 adc_tm->channels[i].chip = adc_tm;
675 tzd = devm_thermal_of_zone_register(adc_tm->dev,
676 adc_tm->channels[i].channel,
677 &adc_tm->channels[i],
678 &adc_tm5_thermal_ops);
679 if (IS_ERR(tzd)) {
680 if (PTR_ERR(tzd) == -ENODEV) {
681 dev_dbg(adc_tm->dev, "thermal sensor on channel %d is not used\n",
682 adc_tm->channels[i].channel);
683 continue;
684 }
685
686 dev_err(adc_tm->dev, "Error registering TZ zone for channel %d: %ld\n",
687 adc_tm->channels[i].channel, PTR_ERR(tzd));
688 return PTR_ERR(tzd);
689 }
690 adc_tm->channels[i].tzd = tzd;
691 devm_thermal_add_hwmon_sysfs(adc_tm->dev, tzd);
692 }
693
694 return 0;
695 }
696
adc_tm_hc_init(struct adc_tm5_chip * chip)697 static int adc_tm_hc_init(struct adc_tm5_chip *chip)
698 {
699 unsigned int i;
700 u8 buf[2];
701 int ret;
702
703 for (i = 0; i < chip->nchannels; i++) {
704 if (chip->channels[i].channel >= ADC_TM5_NUM_CHANNELS) {
705 dev_err(chip->dev, "Invalid channel %d\n", chip->channels[i].channel);
706 return -EINVAL;
707 }
708 }
709
710 buf[0] = chip->decimation;
711 buf[1] = chip->avg_samples | ADC_TM5_FAST_AVG_EN;
712
713 ret = adc_tm5_write(chip, ADC_TM5_ADC_DIG_PARAM, buf, sizeof(buf));
714 if (ret)
715 dev_err(chip->dev, "block write failed: %d\n", ret);
716
717 return ret;
718 }
719
adc_tm5_init(struct adc_tm5_chip * chip)720 static int adc_tm5_init(struct adc_tm5_chip *chip)
721 {
722 u8 buf[4], channels_available;
723 int ret;
724 unsigned int i;
725
726 ret = adc_tm5_read(chip, ADC_TM5_NUM_BTM,
727 &channels_available, sizeof(channels_available));
728 if (ret) {
729 dev_err(chip->dev, "read failed for BTM channels\n");
730 return ret;
731 }
732
733 for (i = 0; i < chip->nchannels; i++) {
734 if (chip->channels[i].channel >= channels_available) {
735 dev_err(chip->dev, "Invalid channel %d\n", chip->channels[i].channel);
736 return -EINVAL;
737 }
738 }
739
740 buf[0] = chip->decimation;
741 buf[1] = chip->avg_samples | ADC_TM5_FAST_AVG_EN;
742 buf[2] = ADC_TM5_TIMER1;
743 buf[3] = FIELD_PREP(ADC_TM5_MEAS_INTERVAL_CTL2_MASK, ADC_TM5_TIMER2) |
744 FIELD_PREP(ADC_TM5_MEAS_INTERVAL_CTL3_MASK, ADC_TM5_TIMER3);
745
746 ret = adc_tm5_write(chip, ADC_TM5_ADC_DIG_PARAM, buf, sizeof(buf));
747 if (ret) {
748 dev_err(chip->dev, "block write failed: %d\n", ret);
749 return ret;
750 }
751
752 return ret;
753 }
754
adc_tm5_gen2_init(struct adc_tm5_chip * chip)755 static int adc_tm5_gen2_init(struct adc_tm5_chip *chip)
756 {
757 u8 channels_available;
758 int ret;
759 unsigned int i;
760
761 ret = adc_tm5_read(chip, ADC_TM5_NUM_BTM,
762 &channels_available, sizeof(channels_available));
763 if (ret) {
764 dev_err(chip->dev, "read failed for BTM channels\n");
765 return ret;
766 }
767
768 for (i = 0; i < chip->nchannels; i++) {
769 if (chip->channels[i].channel >= channels_available) {
770 dev_err(chip->dev, "Invalid channel %d\n", chip->channels[i].channel);
771 return -EINVAL;
772 }
773 }
774
775 mutex_init(&chip->adc_mutex_lock);
776
777 return ret;
778 }
779
adc_tm5_get_dt_channel_data(struct adc_tm5_chip * adc_tm,struct adc_tm5_channel * channel,struct device_node * node)780 static int adc_tm5_get_dt_channel_data(struct adc_tm5_chip *adc_tm,
781 struct adc_tm5_channel *channel,
782 struct device_node *node)
783 {
784 const char *name = node->name;
785 u32 chan, value, adc_channel, varr[2];
786 int ret;
787 struct device *dev = adc_tm->dev;
788 struct of_phandle_args args;
789
790 ret = of_property_read_u32(node, "reg", &chan);
791 if (ret) {
792 dev_err(dev, "%s: invalid channel number %d\n", name, ret);
793 return ret;
794 }
795
796 if (chan >= ADC_TM5_NUM_CHANNELS) {
797 dev_err(dev, "%s: channel number too big: %d\n", name, chan);
798 return -EINVAL;
799 }
800
801 channel->channel = chan;
802
803 /*
804 * We are tied to PMIC's ADC controller, which always use single
805 * argument for channel number. So don't bother parsing
806 * #io-channel-cells, just enforce cell_count = 1.
807 */
808 ret = of_parse_phandle_with_fixed_args(node, "io-channels", 1, 0, &args);
809 if (ret < 0) {
810 dev_err(dev, "%s: error parsing ADC channel number %d: %d\n", name, chan, ret);
811 return ret;
812 }
813 of_node_put(args.np);
814
815 if (args.args_count != 1) {
816 dev_err(dev, "%s: invalid args count for ADC channel %d\n", name, chan);
817 return -EINVAL;
818 }
819
820 adc_channel = args.args[0];
821 if (adc_tm->data->gen == ADC_TM5_GEN2)
822 adc_channel &= 0xff;
823
824 if (adc_channel >= ADC5_MAX_CHANNEL) {
825 dev_err(dev, "%s: invalid ADC channel number %d\n", name, chan);
826 return -EINVAL;
827 }
828 channel->adc_channel = args.args[0];
829
830 channel->iio = devm_fwnode_iio_channel_get_by_name(adc_tm->dev,
831 of_fwnode_handle(node), NULL);
832 if (IS_ERR(channel->iio)) {
833 ret = PTR_ERR(channel->iio);
834 if (ret != -EPROBE_DEFER)
835 dev_err(dev, "%s: error getting channel: %d\n", name, ret);
836 return ret;
837 }
838
839 ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
840 if (!ret) {
841 ret = qcom_adc5_prescaling_from_dt(varr[0], varr[1]);
842 if (ret < 0) {
843 dev_err(dev, "%s: invalid pre-scaling <%d %d>\n",
844 name, varr[0], varr[1]);
845 return ret;
846 }
847 channel->prescale = ret;
848 } else {
849 /* 1:1 prescale is index 0 */
850 channel->prescale = 0;
851 }
852
853 ret = of_property_read_u32(node, "qcom,hw-settle-time-us", &value);
854 if (!ret) {
855 ret = qcom_adc5_hw_settle_time_from_dt(value, adc_tm->data->hw_settle);
856 if (ret < 0) {
857 dev_err(dev, "%s invalid hw-settle-time-us %d us\n",
858 name, value);
859 return ret;
860 }
861 channel->hw_settle_time = ret;
862 } else {
863 channel->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
864 }
865
866 if (of_property_read_bool(node, "qcom,ratiometric"))
867 channel->cal_method = ADC_TM5_RATIOMETRIC_CAL;
868 else
869 channel->cal_method = ADC_TM5_ABSOLUTE_CAL;
870
871 if (adc_tm->data->gen == ADC_TM5_GEN2) {
872 ret = of_property_read_u32(node, "qcom,decimation", &value);
873 if (!ret) {
874 ret = qcom_adc5_decimation_from_dt(value, adc_tm->data->decimation);
875 if (ret < 0) {
876 dev_err(dev, "invalid decimation %d\n", value);
877 return ret;
878 }
879 channel->decimation = ret;
880 } else {
881 channel->decimation = ADC5_DECIMATION_DEFAULT;
882 }
883
884 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
885 if (!ret) {
886 ret = qcom_adc5_avg_samples_from_dt(value);
887 if (ret < 0) {
888 dev_err(dev, "invalid avg-samples %d\n", value);
889 return ret;
890 }
891 channel->avg_samples = ret;
892 } else {
893 channel->avg_samples = VADC_DEF_AVG_SAMPLES;
894 }
895 }
896
897 return 0;
898 }
899
900 static const struct adc_tm5_data adc_tm5_data_pmic = {
901 .full_scale_code_volt = 0x70e4,
902 .decimation = (unsigned int []) { 250, 420, 840 },
903 .hw_settle = (unsigned int []) { 15, 100, 200, 300, 400, 500, 600, 700,
904 1000, 2000, 4000, 8000, 16000, 32000,
905 64000, 128000 },
906 .disable_channel = adc_tm5_disable_channel,
907 .configure = adc_tm5_configure,
908 .isr = adc_tm5_isr,
909 .init = adc_tm5_init,
910 .irq_name = "pm-adc-tm5",
911 .gen = ADC_TM5,
912 };
913
914 static const struct adc_tm5_data adc_tm_hc_data_pmic = {
915 .full_scale_code_volt = 0x70e4,
916 .decimation = (unsigned int []) { 256, 512, 1024 },
917 .hw_settle = (unsigned int []) { 0, 100, 200, 300, 400, 500, 600, 700,
918 1000, 2000, 4000, 6000, 8000, 10000 },
919 .disable_channel = adc_tm5_disable_channel,
920 .configure = adc_tm5_configure,
921 .isr = adc_tm5_isr,
922 .init = adc_tm_hc_init,
923 .irq_name = "pm-adc-tm5",
924 .gen = ADC_TM_HC,
925 };
926
927 static const struct adc_tm5_data adc_tm5_gen2_data_pmic = {
928 .full_scale_code_volt = 0x70e4,
929 .decimation = (unsigned int []) { 85, 340, 1360 },
930 .hw_settle = (unsigned int []) { 15, 100, 200, 300, 400, 500, 600, 700,
931 1000, 2000, 4000, 8000, 16000, 32000,
932 64000, 128000 },
933 .disable_channel = adc_tm5_gen2_disable_channel,
934 .configure = adc_tm5_gen2_configure,
935 .isr = adc_tm5_gen2_isr,
936 .init = adc_tm5_gen2_init,
937 .irq_name = "pm-adc-tm5-gen2",
938 .gen = ADC_TM5_GEN2,
939 };
940
adc_tm5_get_dt_data(struct adc_tm5_chip * adc_tm,struct device_node * node)941 static int adc_tm5_get_dt_data(struct adc_tm5_chip *adc_tm, struct device_node *node)
942 {
943 struct adc_tm5_channel *channels;
944 struct device_node *child;
945 u32 value;
946 int ret;
947 struct device *dev = adc_tm->dev;
948
949 adc_tm->nchannels = of_get_available_child_count(node);
950 if (!adc_tm->nchannels)
951 return -EINVAL;
952
953 adc_tm->channels = devm_kcalloc(dev, adc_tm->nchannels,
954 sizeof(*adc_tm->channels), GFP_KERNEL);
955 if (!adc_tm->channels)
956 return -ENOMEM;
957
958 channels = adc_tm->channels;
959
960 adc_tm->data = of_device_get_match_data(dev);
961 if (!adc_tm->data)
962 adc_tm->data = &adc_tm5_data_pmic;
963
964 ret = of_property_read_u32(node, "qcom,decimation", &value);
965 if (!ret) {
966 ret = qcom_adc5_decimation_from_dt(value, adc_tm->data->decimation);
967 if (ret < 0) {
968 dev_err(dev, "invalid decimation %d\n", value);
969 return ret;
970 }
971 adc_tm->decimation = ret;
972 } else {
973 adc_tm->decimation = ADC5_DECIMATION_DEFAULT;
974 }
975
976 ret = of_property_read_u32(node, "qcom,avg-samples", &value);
977 if (!ret) {
978 ret = qcom_adc5_avg_samples_from_dt(value);
979 if (ret < 0) {
980 dev_err(dev, "invalid avg-samples %d\n", value);
981 return ret;
982 }
983 adc_tm->avg_samples = ret;
984 } else {
985 adc_tm->avg_samples = VADC_DEF_AVG_SAMPLES;
986 }
987
988 for_each_available_child_of_node(node, child) {
989 ret = adc_tm5_get_dt_channel_data(adc_tm, channels, child);
990 if (ret) {
991 of_node_put(child);
992 return ret;
993 }
994
995 channels++;
996 }
997
998 return 0;
999 }
1000
adc_tm5_probe(struct platform_device * pdev)1001 static int adc_tm5_probe(struct platform_device *pdev)
1002 {
1003 struct device_node *node = pdev->dev.of_node;
1004 struct device *dev = &pdev->dev;
1005 struct adc_tm5_chip *adc_tm;
1006 struct regmap *regmap;
1007 int ret, irq;
1008 u32 reg;
1009
1010 regmap = dev_get_regmap(dev->parent, NULL);
1011 if (!regmap)
1012 return -ENODEV;
1013
1014 ret = of_property_read_u32(node, "reg", ®);
1015 if (ret)
1016 return ret;
1017
1018 adc_tm = devm_kzalloc(&pdev->dev, sizeof(*adc_tm), GFP_KERNEL);
1019 if (!adc_tm)
1020 return -ENOMEM;
1021
1022 adc_tm->regmap = regmap;
1023 adc_tm->dev = dev;
1024 adc_tm->base = reg;
1025
1026 irq = platform_get_irq(pdev, 0);
1027 if (irq < 0)
1028 return irq;
1029
1030 ret = adc_tm5_get_dt_data(adc_tm, node);
1031 if (ret)
1032 return dev_err_probe(dev, ret, "get dt data failed\n");
1033
1034 ret = adc_tm->data->init(adc_tm);
1035 if (ret) {
1036 dev_err(dev, "adc-tm init failed\n");
1037 return ret;
1038 }
1039
1040 ret = adc_tm5_register_tzd(adc_tm);
1041 if (ret) {
1042 dev_err(dev, "tzd register failed\n");
1043 return ret;
1044 }
1045
1046 return devm_request_threaded_irq(dev, irq, NULL, adc_tm->data->isr,
1047 IRQF_ONESHOT, adc_tm->data->irq_name, adc_tm);
1048 }
1049
1050 static const struct of_device_id adc_tm5_match_table[] = {
1051 {
1052 .compatible = "qcom,spmi-adc-tm5",
1053 .data = &adc_tm5_data_pmic,
1054 },
1055 {
1056 .compatible = "qcom,spmi-adc-tm-hc",
1057 .data = &adc_tm_hc_data_pmic,
1058 },
1059 {
1060 .compatible = "qcom,spmi-adc-tm5-gen2",
1061 .data = &adc_tm5_gen2_data_pmic,
1062 },
1063 { }
1064 };
1065 MODULE_DEVICE_TABLE(of, adc_tm5_match_table);
1066
1067 static struct platform_driver adc_tm5_driver = {
1068 .driver = {
1069 .name = "qcom-spmi-adc-tm5",
1070 .of_match_table = adc_tm5_match_table,
1071 },
1072 .probe = adc_tm5_probe,
1073 };
1074 module_platform_driver(adc_tm5_driver);
1075
1076 MODULE_DESCRIPTION("SPMI PMIC Thermal Monitor ADC driver");
1077 MODULE_LICENSE("GPL v2");
1078