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