1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2022, 2024 Qualcomm Innovation Center, Inc. All rights reserved.
4 */
5
6 #include <linux/bitfield.h>
7 #include <linux/bits.h>
8 #include <linux/leds.h>
9 #include <linux/led-class-flash.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/property.h>
13 #include <linux/regmap.h>
14 #include <media/v4l2-flash-led-class.h>
15
16 /* registers definitions */
17 #define FLASH_REVISION_REG 0x00
18 #define FLASH_4CH_REVISION_V0P1 0x01
19
20 #define FLASH_TYPE_REG 0x04
21 #define FLASH_TYPE_VAL 0x18
22
23 #define FLASH_SUBTYPE_REG 0x05
24 #define FLASH_SUBTYPE_3CH_PM8150_VAL 0x04
25 #define FLASH_SUBTYPE_3CH_PMI8998_VAL 0x03
26 #define FLASH_SUBTYPE_4CH_VAL 0x07
27
28 #define FLASH_STS_3CH_OTST1 BIT(0)
29 #define FLASH_STS_3CH_OTST2 BIT(1)
30 #define FLASH_STS_3CH_OTST3 BIT(2)
31 #define FLASH_STS_3CH_BOB_THM_OVERLOAD BIT(3)
32 #define FLASH_STS_3CH_VPH_DROOP BIT(4)
33 #define FLASH_STS_3CH_BOB_ILIM_S1 BIT(5)
34 #define FLASH_STS_3CH_BOB_ILIM_S2 BIT(6)
35 #define FLASH_STS_3CH_BCL_IBAT BIT(7)
36
37 #define FLASH_STS_4CH_VPH_LOW BIT(0)
38 #define FLASH_STS_4CH_BCL_IBAT BIT(1)
39 #define FLASH_STS_4CH_BOB_ILIM_S1 BIT(2)
40 #define FLASH_STS_4CH_BOB_ILIM_S2 BIT(3)
41 #define FLASH_STS_4CH_OTST2 BIT(4)
42 #define FLASH_STS_4CH_OTST1 BIT(5)
43 #define FLASH_STS_4CHG_BOB_THM_OVERLOAD BIT(6)
44
45 #define FLASH_TIMER_EN_BIT BIT(7)
46 #define FLASH_TIMER_VAL_MASK GENMASK(6, 0)
47 #define FLASH_TIMER_STEP_MS 10
48
49 #define FLASH_STROBE_HW_SW_SEL_BIT BIT(2)
50 #define SW_STROBE_VAL 0
51 #define HW_STROBE_VAL 1
52 #define FLASH_HW_STROBE_TRIGGER_SEL_BIT BIT(1)
53 #define STROBE_LEVEL_TRIGGER_VAL 0
54 #define STROBE_EDGE_TRIGGER_VAL 1
55 #define FLASH_STROBE_POLARITY_BIT BIT(0)
56 #define STROBE_ACTIVE_HIGH_VAL 1
57
58 #define FLASH_IRES_MASK_4CH BIT(0)
59 #define FLASH_IRES_MASK_3CH GENMASK(1, 0)
60 #define FLASH_IRES_12P5MA_VAL 0
61 #define FLASH_IRES_5MA_VAL_4CH 1
62 #define FLASH_IRES_5MA_VAL_3CH 3
63
64 /* constants */
65 #define FLASH_CURRENT_MAX_UA 1500000
66 #define TORCH_CURRENT_MAX_UA 500000
67 #define FLASH_TOTAL_CURRENT_MAX_UA 2000000
68 #define FLASH_CURRENT_DEFAULT_UA 1000000
69 #define TORCH_CURRENT_DEFAULT_UA 200000
70
71 #define TORCH_IRES_UA 5000
72 #define FLASH_IRES_UA 12500
73
74 #define FLASH_TIMEOUT_MAX_US 1280000
75 #define FLASH_TIMEOUT_STEP_US 10000
76
77 #define UA_PER_MA 1000
78
79 /* thermal threshold constants */
80 #define OTST_3CH_MIN_VAL 3
81 #define OTST1_4CH_MIN_VAL 0
82 #define OTST1_4CH_V0P1_MIN_VAL 3
83 #define OTST2_4CH_MIN_VAL 0
84
85 #define OTST1_MAX_CURRENT_MA 1000
86 #define OTST2_MAX_CURRENT_MA 500
87 #define OTST3_MAX_CURRENT_MA 200
88
89 enum hw_type {
90 QCOM_MVFLASH_3CH,
91 QCOM_MVFLASH_4CH,
92 };
93
94 enum led_mode {
95 FLASH_MODE,
96 TORCH_MODE,
97 };
98
99 enum led_strobe {
100 SW_STROBE,
101 HW_STROBE,
102 };
103
104 enum {
105 REG_STATUS1,
106 REG_STATUS2,
107 REG_STATUS3,
108 REG_CHAN_TIMER,
109 REG_ITARGET,
110 REG_MODULE_EN,
111 REG_IRESOLUTION,
112 REG_CHAN_STROBE,
113 REG_CHAN_EN,
114 REG_THERM_THRSH1,
115 REG_THERM_THRSH2,
116 REG_THERM_THRSH3,
117 REG_MAX_COUNT,
118 };
119
120 static struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = {
121 REG_FIELD(0x08, 0, 7), /* status1 */
122 REG_FIELD(0x09, 0, 7), /* status2 */
123 REG_FIELD(0x0a, 0, 7), /* status3 */
124 REG_FIELD_ID(0x40, 0, 7, 3, 1), /* chan_timer */
125 REG_FIELD_ID(0x43, 0, 6, 3, 1), /* itarget */
126 REG_FIELD(0x46, 7, 7), /* module_en */
127 REG_FIELD(0x47, 0, 5), /* iresolution */
128 REG_FIELD_ID(0x49, 0, 2, 3, 1), /* chan_strobe */
129 REG_FIELD(0x4c, 0, 2), /* chan_en */
130 REG_FIELD(0x56, 0, 2), /* therm_thrsh1 */
131 REG_FIELD(0x57, 0, 2), /* therm_thrsh2 */
132 REG_FIELD(0x58, 0, 2), /* therm_thrsh3 */
133 };
134
135 static struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = {
136 REG_FIELD(0x06, 0, 7), /* status1 */
137 REG_FIELD(0x07, 0, 6), /* status2 */
138 REG_FIELD(0x09, 0, 7), /* status3 */
139 REG_FIELD_ID(0x3e, 0, 7, 4, 1), /* chan_timer */
140 REG_FIELD_ID(0x42, 0, 6, 4, 1), /* itarget */
141 REG_FIELD(0x46, 7, 7), /* module_en */
142 REG_FIELD(0x49, 0, 3), /* iresolution */
143 REG_FIELD_ID(0x4a, 0, 6, 4, 1), /* chan_strobe */
144 REG_FIELD(0x4e, 0, 3), /* chan_en */
145 REG_FIELD(0x7a, 0, 2), /* therm_thrsh1 */
146 REG_FIELD(0x78, 0, 2), /* therm_thrsh2 */
147 };
148
149 struct qcom_flash_data {
150 struct v4l2_flash **v4l2_flash;
151 struct regmap_field *r_fields[REG_MAX_COUNT];
152 struct mutex lock;
153 enum hw_type hw_type;
154 u32 total_ma;
155 u8 leds_count;
156 u8 max_channels;
157 u8 chan_en_bits;
158 u8 revision;
159 };
160
161 struct qcom_flash_led {
162 struct qcom_flash_data *flash_data;
163 struct led_classdev_flash flash;
164 u32 max_flash_current_ma;
165 u32 max_torch_current_ma;
166 u32 max_timeout_ms;
167 u32 flash_current_ma;
168 u32 flash_timeout_ms;
169 u32 current_in_use_ma;
170 u8 *chan_id;
171 u8 chan_count;
172 bool enabled;
173 };
174
set_flash_module_en(struct qcom_flash_led * led,bool en)175 static int set_flash_module_en(struct qcom_flash_led *led, bool en)
176 {
177 struct qcom_flash_data *flash_data = led->flash_data;
178 u8 led_mask = 0, enable;
179 int i, rc;
180
181 for (i = 0; i < led->chan_count; i++)
182 led_mask |= BIT(led->chan_id[i]);
183
184 mutex_lock(&flash_data->lock);
185 if (en)
186 flash_data->chan_en_bits |= led_mask;
187 else
188 flash_data->chan_en_bits &= ~led_mask;
189
190 enable = !!flash_data->chan_en_bits;
191 rc = regmap_field_write(flash_data->r_fields[REG_MODULE_EN], enable);
192 if (rc)
193 dev_err(led->flash.led_cdev.dev, "write module_en failed, rc=%d\n", rc);
194 mutex_unlock(&flash_data->lock);
195
196 return rc;
197 }
198
update_allowed_flash_current(struct qcom_flash_led * led,u32 * current_ma,bool strobe)199 static int update_allowed_flash_current(struct qcom_flash_led *led, u32 *current_ma, bool strobe)
200 {
201 struct qcom_flash_data *flash_data = led->flash_data;
202 u32 therm_ma, avail_ma, thrsh[3], min_thrsh, sts;
203 int rc = 0;
204
205 mutex_lock(&flash_data->lock);
206 /*
207 * Put previously allocated current into allowed budget in either of these two cases:
208 * 1) LED is disabled;
209 * 2) LED is enabled repeatedly
210 */
211 if (!strobe || led->current_in_use_ma != 0) {
212 if (flash_data->total_ma >= led->current_in_use_ma)
213 flash_data->total_ma -= led->current_in_use_ma;
214 else
215 flash_data->total_ma = 0;
216
217 led->current_in_use_ma = 0;
218 if (!strobe)
219 goto unlock;
220 }
221
222 /*
223 * Cache the default thermal threshold settings, and set them to the lowest levels before
224 * reading over-temp real time status. If over-temp has been triggered at the lowest
225 * threshold, it's very likely that it would be triggered at a higher (default) threshold
226 * when more flash current is requested. Prevent device from triggering over-temp condition
227 * by limiting the flash current for the new request.
228 */
229 rc = regmap_field_read(flash_data->r_fields[REG_THERM_THRSH1], &thrsh[0]);
230 if (rc < 0)
231 goto unlock;
232
233 rc = regmap_field_read(flash_data->r_fields[REG_THERM_THRSH2], &thrsh[1]);
234 if (rc < 0)
235 goto unlock;
236
237 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
238 rc = regmap_field_read(flash_data->r_fields[REG_THERM_THRSH3], &thrsh[2]);
239 if (rc < 0)
240 goto unlock;
241 }
242
243 min_thrsh = OTST_3CH_MIN_VAL;
244 if (flash_data->hw_type == QCOM_MVFLASH_4CH)
245 min_thrsh = (flash_data->revision == FLASH_4CH_REVISION_V0P1) ?
246 OTST1_4CH_V0P1_MIN_VAL : OTST1_4CH_MIN_VAL;
247
248 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH1], min_thrsh);
249 if (rc < 0)
250 goto unlock;
251
252 if (flash_data->hw_type == QCOM_MVFLASH_4CH)
253 min_thrsh = OTST2_4CH_MIN_VAL;
254
255 /*
256 * The default thermal threshold settings have been updated hence
257 * restore them if any fault happens starting from here.
258 */
259 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH2], min_thrsh);
260 if (rc < 0)
261 goto restore;
262
263 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
264 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH3], min_thrsh);
265 if (rc < 0)
266 goto restore;
267 }
268
269 /* Read thermal level status to get corresponding derating flash current */
270 rc = regmap_field_read(flash_data->r_fields[REG_STATUS2], &sts);
271 if (rc)
272 goto restore;
273
274 therm_ma = FLASH_TOTAL_CURRENT_MAX_UA / 1000;
275 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
276 if (sts & FLASH_STS_3CH_OTST3)
277 therm_ma = OTST3_MAX_CURRENT_MA;
278 else if (sts & FLASH_STS_3CH_OTST2)
279 therm_ma = OTST2_MAX_CURRENT_MA;
280 else if (sts & FLASH_STS_3CH_OTST1)
281 therm_ma = OTST1_MAX_CURRENT_MA;
282 } else {
283 if (sts & FLASH_STS_4CH_OTST2)
284 therm_ma = OTST2_MAX_CURRENT_MA;
285 else if (sts & FLASH_STS_4CH_OTST1)
286 therm_ma = OTST1_MAX_CURRENT_MA;
287 }
288
289 /* Calculate the allowed flash current for the request */
290 if (therm_ma <= flash_data->total_ma)
291 avail_ma = 0;
292 else
293 avail_ma = therm_ma - flash_data->total_ma;
294
295 *current_ma = min_t(u32, *current_ma, avail_ma);
296 led->current_in_use_ma = *current_ma;
297 flash_data->total_ma += led->current_in_use_ma;
298
299 dev_dbg(led->flash.led_cdev.dev, "allowed flash current: %dmA, total current: %dmA\n",
300 led->current_in_use_ma, flash_data->total_ma);
301
302 restore:
303 /* Restore to default thermal threshold settings */
304 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH1], thrsh[0]);
305 if (rc < 0)
306 goto unlock;
307
308 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH2], thrsh[1]);
309 if (rc < 0)
310 goto unlock;
311
312 if (flash_data->hw_type == QCOM_MVFLASH_3CH)
313 rc = regmap_field_write(flash_data->r_fields[REG_THERM_THRSH3], thrsh[2]);
314
315 unlock:
316 mutex_unlock(&flash_data->lock);
317 return rc;
318 }
319
set_flash_current(struct qcom_flash_led * led,u32 current_ma,enum led_mode mode)320 static int set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode)
321 {
322 struct qcom_flash_data *flash_data = led->flash_data;
323 u32 itarg_ua, ires_ua;
324 u8 shift, ires_mask = 0, ires_val = 0, chan_id;
325 int i, rc;
326
327 /*
328 * Split the current across the channels and set the
329 * IRESOLUTION and ITARGET registers accordingly.
330 */
331 itarg_ua = (current_ma * UA_PER_MA) / led->chan_count + 1;
332 ires_ua = (mode == FLASH_MODE) ? FLASH_IRES_UA : TORCH_IRES_UA;
333
334 for (i = 0; i < led->chan_count; i++) {
335 u8 itarget = 0;
336
337 if (itarg_ua > ires_ua)
338 itarget = itarg_ua / ires_ua - 1;
339
340 chan_id = led->chan_id[i];
341
342 rc = regmap_fields_write(flash_data->r_fields[REG_ITARGET], chan_id, itarget);
343 if (rc)
344 return rc;
345
346 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
347 shift = chan_id * 2;
348 ires_mask |= FLASH_IRES_MASK_3CH << shift;
349 ires_val |= ((mode == FLASH_MODE) ?
350 (FLASH_IRES_12P5MA_VAL << shift) :
351 (FLASH_IRES_5MA_VAL_3CH << shift));
352 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) {
353 shift = chan_id;
354 ires_mask |= FLASH_IRES_MASK_4CH << shift;
355 ires_val |= ((mode == FLASH_MODE) ?
356 (FLASH_IRES_12P5MA_VAL << shift) :
357 (FLASH_IRES_5MA_VAL_4CH << shift));
358 } else {
359 dev_err(led->flash.led_cdev.dev,
360 "HW type %d is not supported\n", flash_data->hw_type);
361 return -EOPNOTSUPP;
362 }
363 }
364
365 return regmap_field_update_bits(flash_data->r_fields[REG_IRESOLUTION], ires_mask, ires_val);
366 }
367
set_flash_timeout(struct qcom_flash_led * led,u32 timeout_ms)368 static int set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms)
369 {
370 struct qcom_flash_data *flash_data = led->flash_data;
371 u8 timer, chan_id;
372 int rc, i;
373
374 /* set SAFETY_TIMER for all the channels connected to the same LED */
375 timeout_ms = min_t(u32, timeout_ms, led->max_timeout_ms);
376
377 for (i = 0; i < led->chan_count; i++) {
378 chan_id = led->chan_id[i];
379
380 timer = timeout_ms / FLASH_TIMER_STEP_MS;
381 timer = clamp_t(u8, timer, 0, FLASH_TIMER_VAL_MASK);
382
383 if (timeout_ms)
384 timer |= FLASH_TIMER_EN_BIT;
385
386 rc = regmap_fields_write(flash_data->r_fields[REG_CHAN_TIMER], chan_id, timer);
387 if (rc)
388 return rc;
389 }
390
391 return 0;
392 }
393
set_flash_strobe(struct qcom_flash_led * led,enum led_strobe strobe,bool state)394 static int set_flash_strobe(struct qcom_flash_led *led, enum led_strobe strobe, bool state)
395 {
396 struct qcom_flash_data *flash_data = led->flash_data;
397 u8 strobe_sel, chan_en, chan_id, chan_mask = 0;
398 int rc, i;
399
400 /* Set SW strobe config for all channels connected to the LED */
401 for (i = 0; i < led->chan_count; i++) {
402 chan_id = led->chan_id[i];
403
404 if (strobe == SW_STROBE)
405 strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, SW_STROBE_VAL);
406 else
407 strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, HW_STROBE_VAL);
408
409 strobe_sel |=
410 FIELD_PREP(FLASH_HW_STROBE_TRIGGER_SEL_BIT, STROBE_LEVEL_TRIGGER_VAL) |
411 FIELD_PREP(FLASH_STROBE_POLARITY_BIT, STROBE_ACTIVE_HIGH_VAL);
412
413 rc = regmap_fields_write(
414 flash_data->r_fields[REG_CHAN_STROBE], chan_id, strobe_sel);
415 if (rc)
416 return rc;
417
418 chan_mask |= BIT(chan_id);
419 }
420
421 /* Enable/disable flash channels */
422 chan_en = state ? chan_mask : 0;
423 rc = regmap_field_update_bits(flash_data->r_fields[REG_CHAN_EN], chan_mask, chan_en);
424 if (rc)
425 return rc;
426
427 led->enabled = state;
428 return 0;
429 }
430
flcdev_to_qcom_fled(struct led_classdev_flash * flcdev)431 static inline struct qcom_flash_led *flcdev_to_qcom_fled(struct led_classdev_flash *flcdev)
432 {
433 return container_of(flcdev, struct qcom_flash_led, flash);
434 }
435
qcom_flash_brightness_set(struct led_classdev_flash * fled_cdev,u32 brightness)436 static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
437 {
438 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
439
440 led->flash_current_ma = min_t(u32, led->max_flash_current_ma, brightness / UA_PER_MA);
441 return 0;
442 }
443
qcom_flash_timeout_set(struct led_classdev_flash * fled_cdev,u32 timeout)444 static int qcom_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout)
445 {
446 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
447
448 led->flash_timeout_ms = timeout / USEC_PER_MSEC;
449 return 0;
450 }
451
qcom_flash_strobe_set(struct led_classdev_flash * fled_cdev,bool state)452 static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
453 {
454 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
455 int rc;
456
457 rc = set_flash_strobe(led, SW_STROBE, false);
458 if (rc)
459 return rc;
460
461 rc = update_allowed_flash_current(led, &led->flash_current_ma, state);
462 if (rc < 0)
463 return rc;
464
465 rc = set_flash_current(led, led->flash_current_ma, FLASH_MODE);
466 if (rc)
467 return rc;
468
469 rc = set_flash_timeout(led, led->flash_timeout_ms);
470 if (rc)
471 return rc;
472
473 rc = set_flash_module_en(led, state);
474 if (rc)
475 return rc;
476
477 return set_flash_strobe(led, SW_STROBE, state);
478 }
479
qcom_flash_strobe_get(struct led_classdev_flash * fled_cdev,bool * state)480 static int qcom_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
481 {
482 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
483
484 *state = led->enabled;
485 return 0;
486 }
487
qcom_flash_fault_get(struct led_classdev_flash * fled_cdev,u32 * fault)488 static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
489 {
490 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
491 struct qcom_flash_data *flash_data = led->flash_data;
492 u8 shift, chan_id, chan_mask = 0;
493 u8 ot_mask = 0, oc_mask = 0, uv_mask = 0;
494 u32 val, fault_sts = 0;
495 int i, rc;
496
497 rc = regmap_field_read(flash_data->r_fields[REG_STATUS1], &val);
498 if (rc)
499 return rc;
500
501 for (i = 0; i < led->chan_count; i++) {
502 chan_id = led->chan_id[i];
503 shift = chan_id * 2;
504
505 if (val & BIT(shift))
506 fault_sts |= LED_FAULT_SHORT_CIRCUIT;
507
508 chan_mask |= BIT(chan_id);
509 }
510
511 rc = regmap_field_read(flash_data->r_fields[REG_STATUS2], &val);
512 if (rc)
513 return rc;
514
515 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
516 ot_mask = FLASH_STS_3CH_OTST1 |
517 FLASH_STS_3CH_OTST2 |
518 FLASH_STS_3CH_OTST3 |
519 FLASH_STS_3CH_BOB_THM_OVERLOAD;
520 oc_mask = FLASH_STS_3CH_BOB_ILIM_S1 |
521 FLASH_STS_3CH_BOB_ILIM_S2 |
522 FLASH_STS_3CH_BCL_IBAT;
523 uv_mask = FLASH_STS_3CH_VPH_DROOP;
524 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) {
525 ot_mask = FLASH_STS_4CH_OTST2 |
526 FLASH_STS_4CH_OTST1 |
527 FLASH_STS_4CHG_BOB_THM_OVERLOAD;
528 oc_mask = FLASH_STS_4CH_BCL_IBAT |
529 FLASH_STS_4CH_BOB_ILIM_S1 |
530 FLASH_STS_4CH_BOB_ILIM_S2;
531 uv_mask = FLASH_STS_4CH_VPH_LOW;
532 }
533
534 if (val & ot_mask)
535 fault_sts |= LED_FAULT_OVER_TEMPERATURE;
536
537 if (val & oc_mask)
538 fault_sts |= LED_FAULT_OVER_CURRENT;
539
540 if (val & uv_mask)
541 fault_sts |= LED_FAULT_INPUT_VOLTAGE;
542
543 rc = regmap_field_read(flash_data->r_fields[REG_STATUS3], &val);
544 if (rc)
545 return rc;
546
547 if (flash_data->hw_type == QCOM_MVFLASH_3CH) {
548 if (val & chan_mask)
549 fault_sts |= LED_FAULT_TIMEOUT;
550 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) {
551 for (i = 0; i < led->chan_count; i++) {
552 chan_id = led->chan_id[i];
553 shift = chan_id * 2;
554
555 if (val & BIT(shift))
556 fault_sts |= LED_FAULT_TIMEOUT;
557 }
558 }
559
560 *fault = fault_sts;
561 return 0;
562 }
563
qcom_flash_led_brightness_set(struct led_classdev * led_cdev,enum led_brightness brightness)564 static int qcom_flash_led_brightness_set(struct led_classdev *led_cdev,
565 enum led_brightness brightness)
566 {
567 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
568 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
569 u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL;
570 bool enable = !!brightness;
571 int rc;
572
573 rc = set_flash_strobe(led, SW_STROBE, false);
574 if (rc)
575 return rc;
576
577 rc = set_flash_module_en(led, false);
578 if (rc)
579 return rc;
580
581 rc = update_allowed_flash_current(led, ¤t_ma, enable);
582 if (rc < 0)
583 return rc;
584
585 rc = set_flash_current(led, current_ma, TORCH_MODE);
586 if (rc)
587 return rc;
588
589 /* Disable flash timeout for torch LED */
590 rc = set_flash_timeout(led, 0);
591 if (rc)
592 return rc;
593
594 rc = set_flash_module_en(led, enable);
595 if (rc)
596 return rc;
597
598 return set_flash_strobe(led, SW_STROBE, enable);
599 }
600
601 static const struct led_flash_ops qcom_flash_ops = {
602 .flash_brightness_set = qcom_flash_brightness_set,
603 .strobe_set = qcom_flash_strobe_set,
604 .strobe_get = qcom_flash_strobe_get,
605 .timeout_set = qcom_flash_timeout_set,
606 .fault_get = qcom_flash_fault_get,
607 };
608
609 #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
qcom_flash_external_strobe_set(struct v4l2_flash * v4l2_flash,bool enable)610 static int qcom_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
611 {
612 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
613 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
614 int rc;
615
616 rc = set_flash_module_en(led, enable);
617 if (rc)
618 return rc;
619
620 if (enable)
621 return set_flash_strobe(led, HW_STROBE, true);
622 else
623 return set_flash_strobe(led, SW_STROBE, false);
624 }
625
626 static enum led_brightness
qcom_flash_intensity_to_led_brightness(struct v4l2_flash * v4l2_flash,s32 intensity)627 qcom_flash_intensity_to_led_brightness(struct v4l2_flash *v4l2_flash, s32 intensity)
628 {
629 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
630 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
631 u32 current_ma = intensity / UA_PER_MA;
632
633 current_ma = min_t(u32, current_ma, led->max_torch_current_ma);
634 if (!current_ma)
635 return LED_OFF;
636
637 return (current_ma * LED_FULL) / led->max_torch_current_ma;
638 }
639
qcom_flash_brightness_to_led_intensity(struct v4l2_flash * v4l2_flash,enum led_brightness brightness)640 static s32 qcom_flash_brightness_to_led_intensity(struct v4l2_flash *v4l2_flash,
641 enum led_brightness brightness)
642 {
643 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
644 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
645
646 return (brightness * led->max_torch_current_ma * UA_PER_MA) / LED_FULL;
647 }
648
649 static const struct v4l2_flash_ops qcom_v4l2_flash_ops = {
650 .external_strobe_set = qcom_flash_external_strobe_set,
651 .intensity_to_led_brightness = qcom_flash_intensity_to_led_brightness,
652 .led_brightness_to_intensity = qcom_flash_brightness_to_led_intensity,
653 };
654
655 static int
qcom_flash_v4l2_init(struct device * dev,struct qcom_flash_led * led,struct fwnode_handle * fwnode)656 qcom_flash_v4l2_init(struct device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode)
657 {
658 struct qcom_flash_data *flash_data = led->flash_data;
659 struct v4l2_flash_config v4l2_cfg = { 0 };
660 struct led_flash_setting *intensity = &v4l2_cfg.intensity;
661 struct v4l2_flash *v4l2_flash;
662
663 if (!(led->flash.led_cdev.flags & LED_DEV_CAP_FLASH))
664 return 0;
665
666 intensity->min = intensity->step = TORCH_IRES_UA * led->chan_count;
667 intensity->max = led->max_torch_current_ma * UA_PER_MA;
668 intensity->val = min_t(u32, intensity->max, TORCH_CURRENT_DEFAULT_UA);
669
670 strscpy(v4l2_cfg.dev_name, led->flash.led_cdev.dev->kobj.name,
671 sizeof(v4l2_cfg.dev_name));
672
673 v4l2_cfg.has_external_strobe = true;
674 v4l2_cfg.flash_faults = LED_FAULT_INPUT_VOLTAGE |
675 LED_FAULT_OVER_CURRENT |
676 LED_FAULT_SHORT_CIRCUIT |
677 LED_FAULT_OVER_TEMPERATURE |
678 LED_FAULT_TIMEOUT;
679
680 v4l2_flash = v4l2_flash_init(dev, fwnode, &led->flash, &qcom_v4l2_flash_ops, &v4l2_cfg);
681 if (IS_ERR(v4l2_flash))
682 return PTR_ERR(v4l2_flash);
683
684 flash_data->v4l2_flash[flash_data->leds_count] = v4l2_flash;
685 return 0;
686 }
687 # else
688 static int
qcom_flash_v4l2_init(struct device * dev,struct qcom_flash_led * led,struct fwnode_handle * fwnode)689 qcom_flash_v4l2_init(struct device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode)
690 {
691 return 0;
692 }
693 #endif
694
qcom_flash_register_led_device(struct device * dev,struct fwnode_handle * node,struct qcom_flash_led * led)695 static int qcom_flash_register_led_device(struct device *dev,
696 struct fwnode_handle *node, struct qcom_flash_led *led)
697 {
698 struct qcom_flash_data *flash_data = led->flash_data;
699 struct led_init_data init_data;
700 struct led_classdev_flash *flash = &led->flash;
701 struct led_flash_setting *brightness, *timeout;
702 u32 current_ua, timeout_us;
703 u32 channels[4];
704 int i, rc, count;
705
706 count = fwnode_property_count_u32(node, "led-sources");
707 if (count <= 0) {
708 dev_err(dev, "No led-sources specified\n");
709 return -ENODEV;
710 }
711
712 if (count > flash_data->max_channels) {
713 dev_err(dev, "led-sources count %u exceeds maximum channel count %u\n",
714 count, flash_data->max_channels);
715 return -EINVAL;
716 }
717
718 rc = fwnode_property_read_u32_array(node, "led-sources", channels, count);
719 if (rc < 0) {
720 dev_err(dev, "Failed to read led-sources property, rc=%d\n", rc);
721 return rc;
722 }
723
724 led->chan_count = count;
725 led->chan_id = devm_kcalloc(dev, count, sizeof(u8), GFP_KERNEL);
726 if (!led->chan_id)
727 return -ENOMEM;
728
729 for (i = 0; i < count; i++) {
730 if ((channels[i] == 0) || (channels[i] > flash_data->max_channels)) {
731 dev_err(dev, "led-source out of HW support range [1-%u]\n",
732 flash_data->max_channels);
733 return -EINVAL;
734 }
735
736 /* Make chan_id indexing from 0 */
737 led->chan_id[i] = channels[i] - 1;
738 }
739
740 rc = fwnode_property_read_u32(node, "led-max-microamp", ¤t_ua);
741 if (rc < 0) {
742 dev_err(dev, "Failed to read led-max-microamp property, rc=%d\n", rc);
743 return rc;
744 }
745
746 if (current_ua == 0) {
747 dev_err(dev, "led-max-microamp shouldn't be 0\n");
748 return -EINVAL;
749 }
750
751 current_ua = min_t(u32, current_ua, TORCH_CURRENT_MAX_UA * led->chan_count);
752 led->max_torch_current_ma = current_ua / UA_PER_MA;
753
754 if (fwnode_property_present(node, "flash-max-microamp")) {
755 flash->led_cdev.flags |= LED_DEV_CAP_FLASH;
756
757 rc = fwnode_property_read_u32(node, "flash-max-microamp", ¤t_ua);
758 if (rc < 0) {
759 dev_err(dev, "Failed to read flash-max-microamp property, rc=%d\n",
760 rc);
761 return rc;
762 }
763
764 current_ua = min_t(u32, current_ua, FLASH_CURRENT_MAX_UA * led->chan_count);
765 current_ua = min_t(u32, current_ua, FLASH_TOTAL_CURRENT_MAX_UA);
766
767 /* Initialize flash class LED device brightness settings */
768 brightness = &flash->brightness;
769 brightness->min = brightness->step = FLASH_IRES_UA * led->chan_count;
770 brightness->max = current_ua;
771 brightness->val = min_t(u32, current_ua, FLASH_CURRENT_DEFAULT_UA);
772
773 led->max_flash_current_ma = current_ua / UA_PER_MA;
774 led->flash_current_ma = brightness->val / UA_PER_MA;
775
776 rc = fwnode_property_read_u32(node, "flash-max-timeout-us", &timeout_us);
777 if (rc < 0) {
778 dev_err(dev, "Failed to read flash-max-timeout-us property, rc=%d\n",
779 rc);
780 return rc;
781 }
782
783 timeout_us = min_t(u32, timeout_us, FLASH_TIMEOUT_MAX_US);
784
785 /* Initialize flash class LED device timeout settings */
786 timeout = &flash->timeout;
787 timeout->min = timeout->step = FLASH_TIMEOUT_STEP_US;
788 timeout->val = timeout->max = timeout_us;
789
790 led->max_timeout_ms = led->flash_timeout_ms = timeout_us / USEC_PER_MSEC;
791
792 flash->ops = &qcom_flash_ops;
793 }
794
795 flash->led_cdev.brightness_set_blocking = qcom_flash_led_brightness_set;
796
797 init_data.fwnode = node;
798 init_data.devicename = NULL;
799 init_data.default_label = NULL;
800 init_data.devname_mandatory = false;
801
802 rc = devm_led_classdev_flash_register_ext(dev, flash, &init_data);
803 if (rc < 0) {
804 dev_err(dev, "Register flash LED classdev failed, rc=%d\n", rc);
805 return rc;
806 }
807
808 return qcom_flash_v4l2_init(dev, led, node);
809 }
810
qcom_flash_led_probe(struct platform_device * pdev)811 static int qcom_flash_led_probe(struct platform_device *pdev)
812 {
813 struct qcom_flash_data *flash_data;
814 struct qcom_flash_led *led;
815 struct device *dev = &pdev->dev;
816 struct regmap *regmap;
817 struct reg_field *regs;
818 int count, i, rc;
819 u32 val, reg_base;
820
821 flash_data = devm_kzalloc(dev, sizeof(*flash_data), GFP_KERNEL);
822 if (!flash_data)
823 return -ENOMEM;
824
825 regmap = dev_get_regmap(dev->parent, NULL);
826 if (!regmap) {
827 dev_err(dev, "Failed to get parent regmap\n");
828 return -EINVAL;
829 }
830
831 rc = fwnode_property_read_u32(dev->fwnode, "reg", ®_base);
832 if (rc < 0) {
833 dev_err(dev, "Failed to get register base address, rc=%d\n", rc);
834 return rc;
835 }
836
837 rc = regmap_read(regmap, reg_base + FLASH_TYPE_REG, &val);
838 if (rc < 0) {
839 dev_err(dev, "Read flash LED module type failed, rc=%d\n", rc);
840 return rc;
841 }
842
843 if (val != FLASH_TYPE_VAL) {
844 dev_err(dev, "type %#x is not a flash LED module\n", val);
845 return -ENODEV;
846 }
847
848 rc = regmap_read(regmap, reg_base + FLASH_SUBTYPE_REG, &val);
849 if (rc < 0) {
850 dev_err(dev, "Read flash LED module subtype failed, rc=%d\n", rc);
851 return rc;
852 }
853
854 if (val == FLASH_SUBTYPE_3CH_PM8150_VAL || val == FLASH_SUBTYPE_3CH_PMI8998_VAL) {
855 flash_data->hw_type = QCOM_MVFLASH_3CH;
856 flash_data->max_channels = 3;
857 regs = mvflash_3ch_regs;
858 } else if (val == FLASH_SUBTYPE_4CH_VAL) {
859 flash_data->hw_type = QCOM_MVFLASH_4CH;
860 flash_data->max_channels = 4;
861 regs = mvflash_4ch_regs;
862
863 rc = regmap_read(regmap, reg_base + FLASH_REVISION_REG, &val);
864 if (rc < 0) {
865 dev_err(dev, "Failed to read flash LED module revision, rc=%d\n", rc);
866 return rc;
867 }
868
869 flash_data->revision = val;
870 } else {
871 dev_err(dev, "flash LED subtype %#x is not yet supported\n", val);
872 return -ENODEV;
873 }
874
875 for (i = 0; i < REG_MAX_COUNT; i++)
876 regs[i].reg += reg_base;
877
878 rc = devm_regmap_field_bulk_alloc(dev, regmap, flash_data->r_fields, regs, REG_MAX_COUNT);
879 if (rc < 0) {
880 dev_err(dev, "Failed to allocate regmap field, rc=%d\n", rc);
881 return rc;
882 }
883
884 platform_set_drvdata(pdev, flash_data);
885 mutex_init(&flash_data->lock);
886
887 count = device_get_child_node_count(dev);
888 if (count == 0 || count > flash_data->max_channels) {
889 dev_err(dev, "No child or child count exceeds %d\n", flash_data->max_channels);
890 return -EINVAL;
891 }
892
893 flash_data->v4l2_flash = devm_kcalloc(dev, count,
894 sizeof(*flash_data->v4l2_flash), GFP_KERNEL);
895 if (!flash_data->v4l2_flash)
896 return -ENOMEM;
897
898 device_for_each_child_node_scoped(dev, child) {
899 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
900 if (!led) {
901 rc = -ENOMEM;
902 goto release;
903 }
904
905 led->flash_data = flash_data;
906 rc = qcom_flash_register_led_device(dev, child, led);
907 if (rc < 0)
908 goto release;
909
910 flash_data->leds_count++;
911 }
912
913 return 0;
914
915 release:
916 while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count)
917 v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]);
918 return rc;
919 }
920
qcom_flash_led_remove(struct platform_device * pdev)921 static void qcom_flash_led_remove(struct platform_device *pdev)
922 {
923 struct qcom_flash_data *flash_data = platform_get_drvdata(pdev);
924
925 while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count)
926 v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]);
927
928 mutex_destroy(&flash_data->lock);
929 }
930
931 static const struct of_device_id qcom_flash_led_match_table[] = {
932 { .compatible = "qcom,spmi-flash-led" },
933 { }
934 };
935
936 MODULE_DEVICE_TABLE(of, qcom_flash_led_match_table);
937 static struct platform_driver qcom_flash_led_driver = {
938 .driver = {
939 .name = "leds-qcom-flash",
940 .of_match_table = qcom_flash_led_match_table,
941 },
942 .probe = qcom_flash_led_probe,
943 .remove = qcom_flash_led_remove,
944 };
945
946 module_platform_driver(qcom_flash_led_driver);
947
948 MODULE_DESCRIPTION("QCOM Flash LED driver");
949 MODULE_LICENSE("GPL");
950