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WIP FPC-III support
[linux/fpc-iii.git] / drivers / video / backlight / qcom-wled.c
blob3bc7800eb0a93759ce07b1057bc50ceb0ff7f8ed
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2015, Sony Mobile Communications, AB.
3 */
4
5 #include <linux/delay.h>
6 #include <linux/interrupt.h>
7 #include <linux/ktime.h>
8 #include <linux/kernel.h>
9 #include <linux/backlight.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/of_device.h>
13 #include <linux/of_address.h>
14 #include <linux/regmap.h>
15
16 /* From DT binding */
17 #define WLED_MAX_STRINGS 4
18 #define MOD_A 0
19 #define MOD_B 1
20
21 #define WLED_DEFAULT_BRIGHTNESS 2048
22 #define WLED_SOFT_START_DLY_US 10000
23 #define WLED3_SINK_REG_BRIGHT_MAX 0xFFF
24 #define WLED5_SINK_REG_BRIGHT_MAX_12B 0xFFF
25 #define WLED5_SINK_REG_BRIGHT_MAX_15B 0x7FFF
26
27 /* WLED3/WLED4 control registers */
28 #define WLED3_CTRL_REG_FAULT_STATUS 0x08
29 #define WLED3_CTRL_REG_ILIM_FAULT_BIT BIT(0)
30 #define WLED3_CTRL_REG_OVP_FAULT_BIT BIT(1)
31 #define WLED4_CTRL_REG_SC_FAULT_BIT BIT(2)
32 #define WLED5_CTRL_REG_OVP_PRE_ALARM_BIT BIT(4)
33
34 #define WLED3_CTRL_REG_INT_RT_STS 0x10
35 #define WLED3_CTRL_REG_OVP_FAULT_STATUS BIT(1)
36
37 #define WLED3_CTRL_REG_MOD_EN 0x46
38 #define WLED3_CTRL_REG_MOD_EN_MASK BIT(7)
39 #define WLED3_CTRL_REG_MOD_EN_SHIFT 7
40
41 #define WLED3_CTRL_REG_FEEDBACK_CONTROL 0x48
42
43 #define WLED3_CTRL_REG_FREQ 0x4c
44 #define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0)
45
46 #define WLED3_CTRL_REG_OVP 0x4d
47 #define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)
48 #define WLED5_CTRL_REG_OVP_MASK GENMASK(3, 0)
49
50 #define WLED3_CTRL_REG_ILIMIT 0x4e
51 #define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)
52
53 /* WLED3/WLED4 sink registers */
54 #define WLED3_SINK_REG_SYNC 0x47
55 #define WLED3_SINK_REG_SYNC_CLEAR 0x00
56
57 #define WLED3_SINK_REG_CURR_SINK 0x4f
58 #define WLED3_SINK_REG_CURR_SINK_MASK GENMASK(7, 5)
59 #define WLED3_SINK_REG_CURR_SINK_SHFT 5
60
61 /* WLED3 specific per-'string' registers below */
62 #define WLED3_SINK_REG_BRIGHT(n) (0x40 + n)
63
64 #define WLED3_SINK_REG_STR_MOD_EN(n) (0x60 + (n * 0x10))
65 #define WLED3_SINK_REG_STR_MOD_MASK BIT(7)
66
67 #define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n) (0x62 + (n * 0x10))
68 #define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(4, 0)
69
70 #define WLED3_SINK_REG_STR_MOD_SRC(n) (0x63 + (n * 0x10))
71 #define WLED3_SINK_REG_STR_MOD_SRC_MASK BIT(0)
72 #define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00
73 #define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01
74
75 #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10))
76 #define WLED3_SINK_REG_STR_CABC_MASK BIT(7)
77
78 /* WLED4 specific control registers */
79 #define WLED4_CTRL_REG_SHORT_PROTECT 0x5e
80 #define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7)
81
82 #define WLED4_CTRL_REG_SEC_ACCESS 0xd0
83 #define WLED4_CTRL_REG_SEC_UNLOCK 0xa5
84
85 #define WLED4_CTRL_REG_TEST1 0xe2
86 #define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09
87
88 /* WLED4 specific sink registers */
89 #define WLED4_SINK_REG_CURR_SINK 0x46
90 #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4)
91 #define WLED4_SINK_REG_CURR_SINK_SHFT 4
92
93 /* WLED4 specific per-'string' registers below */
94 #define WLED4_SINK_REG_STR_MOD_EN(n) (0x50 + (n * 0x10))
95 #define WLED4_SINK_REG_STR_MOD_MASK BIT(7)
96
97 #define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n) (0x52 + (n * 0x10))
98 #define WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(3, 0)
99
100 #define WLED4_SINK_REG_STR_MOD_SRC(n) (0x53 + (n * 0x10))
101 #define WLED4_SINK_REG_STR_MOD_SRC_MASK BIT(0)
102 #define WLED4_SINK_REG_STR_MOD_SRC_INT 0x00
103 #define WLED4_SINK_REG_STR_MOD_SRC_EXT 0x01
104
105 #define WLED4_SINK_REG_STR_CABC(n) (0x56 + (n * 0x10))
106 #define WLED4_SINK_REG_STR_CABC_MASK BIT(7)
107
108 #define WLED4_SINK_REG_BRIGHT(n) (0x57 + (n * 0x10))
109
110 /* WLED5 specific control registers */
111 #define WLED5_CTRL_REG_OVP_INT_CTL 0x5f
112 #define WLED5_CTRL_REG_OVP_INT_TIMER_MASK GENMASK(2, 0)
113
114 /* WLED5 specific sink registers */
115 #define WLED5_SINK_REG_MOD_A_EN 0x50
116 #define WLED5_SINK_REG_MOD_B_EN 0x60
117 #define WLED5_SINK_REG_MOD_EN_MASK BIT(7)
118
119 #define WLED5_SINK_REG_MOD_A_SRC_SEL 0x51
120 #define WLED5_SINK_REG_MOD_B_SRC_SEL 0x61
121 #define WLED5_SINK_REG_MOD_SRC_SEL_HIGH 0
122 #define WLED5_SINK_REG_MOD_SRC_SEL_EXT 0x03
123 #define WLED5_SINK_REG_MOD_SRC_SEL_MASK GENMASK(1, 0)
124
125 #define WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL 0x52
126 #define WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL 0x62
127 #define WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B 0
128 #define WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B 1
129
130 #define WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB 0x53
131 #define WLED5_SINK_REG_MOD_A_BRIGHTNESS_MSB 0x54
132 #define WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB 0x63
133 #define WLED5_SINK_REG_MOD_B_BRIGHTNESS_MSB 0x64
134
135 #define WLED5_SINK_REG_MOD_SYNC_BIT 0x65
136 #define WLED5_SINK_REG_SYNC_MOD_A_BIT BIT(0)
137 #define WLED5_SINK_REG_SYNC_MOD_B_BIT BIT(1)
138 #define WLED5_SINK_REG_SYNC_MASK GENMASK(1, 0)
139
140 /* WLED5 specific per-'string' registers below */
141 #define WLED5_SINK_REG_STR_FULL_SCALE_CURR(n) (0x72 + (n * 0x10))
142
143 #define WLED5_SINK_REG_STR_SRC_SEL(n) (0x73 + (n * 0x10))
144 #define WLED5_SINK_REG_SRC_SEL_MOD_A 0
145 #define WLED5_SINK_REG_SRC_SEL_MOD_B 1
146 #define WLED5_SINK_REG_SRC_SEL_MASK GENMASK(1, 0)
147
148 struct wled_var_cfg {
149 const u32 *values;
150 u32 (*fn)(u32);
151 int size;
152 };
153
154 struct wled_u32_opts {
155 const char *name;
156 u32 *val_ptr;
157 const struct wled_var_cfg *cfg;
158 };
159
160 struct wled_bool_opts {
161 const char *name;
162 bool *val_ptr;
163 };
164
165 struct wled_config {
166 u32 boost_i_limit;
167 u32 ovp;
168 u32 switch_freq;
169 u32 num_strings;
170 u32 string_i_limit;
171 u32 enabled_strings[WLED_MAX_STRINGS];
172 u32 mod_sel;
173 u32 cabc_sel;
174 bool cs_out_en;
175 bool ext_gen;
176 bool cabc;
177 bool external_pfet;
178 bool auto_detection_enabled;
179 };
180
181 struct wled {
182 const char *name;
183 struct device *dev;
184 struct regmap *regmap;
185 struct mutex lock; /* Lock to avoid race from thread irq handler */
186 ktime_t last_short_event;
187 ktime_t start_ovp_fault_time;
188 u16 ctrl_addr;
189 u16 sink_addr;
190 u16 max_string_count;
191 u16 auto_detection_ovp_count;
192 u32 brightness;
193 u32 max_brightness;
194 u32 short_count;
195 u32 auto_detect_count;
196 u32 version;
197 bool disabled_by_short;
198 bool has_short_detect;
199 bool cabc_disabled;
200 int short_irq;
201 int ovp_irq;
202
203 struct wled_config cfg;
204 struct delayed_work ovp_work;
205
206 /* Configures the brightness. Applicable for wled3, wled4 and wled5 */
207 int (*wled_set_brightness)(struct wled *wled, u16 brightness);
208
209 /* Configures the cabc register. Applicable for wled4 and wled5 */
210 int (*wled_cabc_config)(struct wled *wled, bool enable);
211
212 /*
213 * Toggles the sync bit for the brightness update to take place.
214 * Applicable for WLED3, WLED4 and WLED5.
215 */
216 int (*wled_sync_toggle)(struct wled *wled);
217
218 /*
219 * Time to wait before checking the OVP status after wled module enable.
220 * Applicable for WLED4 and WLED5.
221 */
222 int (*wled_ovp_delay)(struct wled *wled);
223
224 /*
225 * Determines if the auto string detection is required.
226 * Applicable for WLED4 and WLED5
227 */
228 bool (*wled_auto_detection_required)(struct wled *wled);
229 };
230
231 static int wled3_set_brightness(struct wled *wled, u16 brightness)
232 {
233 int rc, i;
234 u8 v[2];
235
236 v[0] = brightness & 0xff;
237 v[1] = (brightness >> 8) & 0xf;
238
239 for (i = 0; i < wled->cfg.num_strings; ++i) {
240 rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
241 WLED3_SINK_REG_BRIGHT(i), v, 2);
242 if (rc < 0)
243 return rc;
244 }
245
246 return 0;
247 }
248
249 static int wled4_set_brightness(struct wled *wled, u16 brightness)
250 {
251 int rc, i;
252 u16 low_limit = wled->max_brightness * 4 / 1000;
253 u8 v[2];
254
255 /* WLED4's lower limit of operation is 0.4% */
256 if (brightness > 0 && brightness < low_limit)
257 brightness = low_limit;
258
259 v[0] = brightness & 0xff;
260 v[1] = (brightness >> 8) & 0xf;
261
262 for (i = 0; i < wled->cfg.num_strings; ++i) {
263 rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
264 WLED4_SINK_REG_BRIGHT(i), v, 2);
265 if (rc < 0)
266 return rc;
267 }
268
269 return 0;
270 }
271
272 static int wled5_set_brightness(struct wled *wled, u16 brightness)
273 {
274 int rc, offset;
275 u16 low_limit = wled->max_brightness * 1 / 1000;
276 u8 v[2];
277
278 /* WLED5's lower limit is 0.1% */
279 if (brightness < low_limit)
280 brightness = low_limit;
281
282 v[0] = brightness & 0xff;
283 v[1] = (brightness >> 8) & 0x7f;
284
285 offset = (wled->cfg.mod_sel == MOD_A) ?
286 WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB :
287 WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB;
288
289 rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
290 v, 2);
291 return rc;
292 }
293
294 static void wled_ovp_work(struct work_struct *work)
295 {
296 struct wled *wled = container_of(work,
297 struct wled, ovp_work.work);
298 enable_irq(wled->ovp_irq);
299 }
300
301 static int wled_module_enable(struct wled *wled, int val)
302 {
303 int rc;
304
305 if (wled->disabled_by_short)
306 return -ENXIO;
307
308 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
309 WLED3_CTRL_REG_MOD_EN,
310 WLED3_CTRL_REG_MOD_EN_MASK,
311 val << WLED3_CTRL_REG_MOD_EN_SHIFT);
312 if (rc < 0)
313 return rc;
314
315 if (wled->ovp_irq > 0) {
316 if (val) {
317 /*
318 * The hardware generates a storm of spurious OVP
319 * interrupts during soft start operations. So defer
320 * enabling the IRQ for 10ms to ensure that the
321 * soft start is complete.
322 */
323 schedule_delayed_work(&wled->ovp_work, HZ / 100);
324 } else {
325 if (!cancel_delayed_work_sync(&wled->ovp_work))
326 disable_irq(wled->ovp_irq);
327 }
328 }
329
330 return 0;
331 }
332
333 static int wled3_sync_toggle(struct wled *wled)
334 {
335 int rc;
336 unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
337
338 rc = regmap_update_bits(wled->regmap,
339 wled->ctrl_addr + WLED3_SINK_REG_SYNC,
340 mask, mask);
341 if (rc < 0)
342 return rc;
343
344 rc = regmap_update_bits(wled->regmap,
345 wled->ctrl_addr + WLED3_SINK_REG_SYNC,
346 mask, WLED3_SINK_REG_SYNC_CLEAR);
347
348 return rc;
349 }
350
351 static int wled5_sync_toggle(struct wled *wled)
352 {
353 int rc;
354 u8 val;
355
356 val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_SYNC_MOD_A_BIT :
357 WLED5_SINK_REG_SYNC_MOD_B_BIT;
358 rc = regmap_update_bits(wled->regmap,
359 wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
360 WLED5_SINK_REG_SYNC_MASK, val);
361 if (rc < 0)
362 return rc;
363
364 return regmap_update_bits(wled->regmap,
365 wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
366 WLED5_SINK_REG_SYNC_MASK, 0);
367 }
368
369 static int wled_ovp_fault_status(struct wled *wled, bool *fault_set)
370 {
371 int rc;
372 u32 int_rt_sts, fault_sts;
373
374 *fault_set = false;
375 rc = regmap_read(wled->regmap,
376 wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS,
377 &int_rt_sts);
378 if (rc < 0) {
379 dev_err(wled->dev, "Failed to read INT_RT_STS rc=%d\n", rc);
380 return rc;
381 }
382
383 rc = regmap_read(wled->regmap,
384 wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS,
385 &fault_sts);
386 if (rc < 0) {
387 dev_err(wled->dev, "Failed to read FAULT_STATUS rc=%d\n", rc);
388 return rc;
389 }
390
391 if (int_rt_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS)
392 *fault_set = true;
393
394 if (wled->version == 4 && (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT))
395 *fault_set = true;
396
397 if (wled->version == 5 && (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT |
398 WLED5_CTRL_REG_OVP_PRE_ALARM_BIT)))
399 *fault_set = true;
400
401 if (*fault_set)
402 dev_dbg(wled->dev, "WLED OVP fault detected, int_rt_sts=0x%x fault_sts=0x%x\n",
403 int_rt_sts, fault_sts);
404
405 return rc;
406 }
407
408 static int wled4_ovp_delay(struct wled *wled)
409 {
410 return WLED_SOFT_START_DLY_US;
411 }
412
413 static int wled5_ovp_delay(struct wled *wled)
414 {
415 int rc, delay_us;
416 u32 val;
417 u8 ovp_timer_ms[8] = {1, 2, 4, 8, 12, 16, 20, 24};
418
419 /* For WLED5, get the delay based on OVP timer */
420 rc = regmap_read(wled->regmap, wled->ctrl_addr +
421 WLED5_CTRL_REG_OVP_INT_CTL, &val);
422 if (rc < 0)
423 delay_us =
424 ovp_timer_ms[val & WLED5_CTRL_REG_OVP_INT_TIMER_MASK] * 1000;
425 else
426 delay_us = 2 * WLED_SOFT_START_DLY_US;
427
428 dev_dbg(wled->dev, "delay_time_us: %d\n", delay_us);
429
430 return delay_us;
431 }
432
433 static int wled_update_status(struct backlight_device *bl)
434 {
435 struct wled *wled = bl_get_data(bl);
436 u16 brightness = backlight_get_brightness(bl);
437 int rc = 0;
438
439 mutex_lock(&wled->lock);
440 if (brightness) {
441 rc = wled->wled_set_brightness(wled, brightness);
442 if (rc < 0) {
443 dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
444 rc);
445 goto unlock_mutex;
446 }
447
448 rc = wled->wled_sync_toggle(wled);
449 if (rc < 0) {
450 dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
451 goto unlock_mutex;
452 }
453 }
454
455 if (!!brightness != !!wled->brightness) {
456 rc = wled_module_enable(wled, !!brightness);
457 if (rc < 0) {
458 dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
459 goto unlock_mutex;
460 }
461 }
462
463 wled->brightness = brightness;
464
465 unlock_mutex:
466 mutex_unlock(&wled->lock);
467
468 return rc;
469 }
470
471 static int wled4_cabc_config(struct wled *wled, bool enable)
472 {
473 int i, j, rc;
474 u8 val;
475
476 for (i = 0; i < wled->cfg.num_strings; i++) {
477 j = wled->cfg.enabled_strings[i];
478
479 val = enable ? WLED4_SINK_REG_STR_CABC_MASK : 0;
480 rc = regmap_update_bits(wled->regmap, wled->sink_addr +
481 WLED4_SINK_REG_STR_CABC(j),
482 WLED4_SINK_REG_STR_CABC_MASK, val);
483 if (rc < 0)
484 return rc;
485 }
486
487 return 0;
488 }
489
490 static int wled5_cabc_config(struct wled *wled, bool enable)
491 {
492 int rc, offset;
493 u8 reg;
494
495 if (wled->cabc_disabled)
496 return 0;
497
498 reg = enable ? wled->cfg.cabc_sel : 0;
499 offset = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_A_SRC_SEL :
500 WLED5_SINK_REG_MOD_B_SRC_SEL;
501
502 rc = regmap_update_bits(wled->regmap, wled->sink_addr + offset,
503 WLED5_SINK_REG_MOD_SRC_SEL_MASK, reg);
504 if (rc < 0) {
505 pr_err("Error in configuring CABC rc=%d\n", rc);
506 return rc;
507 }
508
509 if (!wled->cfg.cabc_sel)
510 wled->cabc_disabled = true;
511
512 return 0;
513 }
514
515 #define WLED_SHORT_DLY_MS 20
516 #define WLED_SHORT_CNT_MAX 5
517 #define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC
518
519 static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
520 {
521 struct wled *wled = _wled;
522 int rc;
523 s64 elapsed_time;
524
525 wled->short_count++;
526 mutex_lock(&wled->lock);
527 rc = wled_module_enable(wled, false);
528 if (rc < 0) {
529 dev_err(wled->dev, "wled disable failed rc:%d\n", rc);
530 goto unlock_mutex;
531 }
532
533 elapsed_time = ktime_us_delta(ktime_get(),
534 wled->last_short_event);
535 if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US)
536 wled->short_count = 1;
537
538 if (wled->short_count > WLED_SHORT_CNT_MAX) {
539 dev_err(wled->dev, "Short triggered %d times, disabling WLED forever!\n",
540 wled->short_count);
541 wled->disabled_by_short = true;
542 goto unlock_mutex;
543 }
544
545 wled->last_short_event = ktime_get();
546
547 msleep(WLED_SHORT_DLY_MS);
548 rc = wled_module_enable(wled, true);
549 if (rc < 0)
550 dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
551
552 unlock_mutex:
553 mutex_unlock(&wled->lock);
554
555 return IRQ_HANDLED;
556 }
557
558 #define AUTO_DETECT_BRIGHTNESS 200
559
560 static void wled_auto_string_detection(struct wled *wled)
561 {
562 int rc = 0, i, delay_time_us;
563 u32 sink_config = 0;
564 u8 sink_test = 0, sink_valid = 0, val;
565 bool fault_set;
566
567 /* Read configured sink configuration */
568 rc = regmap_read(wled->regmap, wled->sink_addr +
569 WLED4_SINK_REG_CURR_SINK, &sink_config);
570 if (rc < 0) {
571 dev_err(wled->dev, "Failed to read SINK configuration rc=%d\n",
572 rc);
573 goto failed_detect;
574 }
575
576 /* Disable the module before starting detection */
577 rc = regmap_update_bits(wled->regmap,
578 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
579 WLED3_CTRL_REG_MOD_EN_MASK, 0);
580 if (rc < 0) {
581 dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", rc);
582 goto failed_detect;
583 }
584
585 /* Set low brightness across all sinks */
586 rc = wled4_set_brightness(wled, AUTO_DETECT_BRIGHTNESS);
587 if (rc < 0) {
588 dev_err(wled->dev, "Failed to set brightness for auto detection rc=%d\n",
589 rc);
590 goto failed_detect;
591 }
592
593 if (wled->cfg.cabc) {
594 rc = wled->wled_cabc_config(wled, false);
595 if (rc < 0)
596 goto failed_detect;
597 }
598
599 /* Disable all sinks */
600 rc = regmap_write(wled->regmap,
601 wled->sink_addr + WLED4_SINK_REG_CURR_SINK, 0);
602 if (rc < 0) {
603 dev_err(wled->dev, "Failed to disable all sinks rc=%d\n", rc);
604 goto failed_detect;
605 }
606
607 /* Iterate through the strings one by one */
608 for (i = 0; i < wled->cfg.num_strings; i++) {
609 sink_test = BIT((WLED4_SINK_REG_CURR_SINK_SHFT + i));
610
611 /* Enable feedback control */
612 rc = regmap_write(wled->regmap, wled->ctrl_addr +
613 WLED3_CTRL_REG_FEEDBACK_CONTROL, i + 1);
614 if (rc < 0) {
615 dev_err(wled->dev, "Failed to enable feedback for SINK %d rc = %d\n",
616 i + 1, rc);
617 goto failed_detect;
618 }
619
620 /* Enable the sink */
621 rc = regmap_write(wled->regmap, wled->sink_addr +
622 WLED4_SINK_REG_CURR_SINK, sink_test);
623 if (rc < 0) {
624 dev_err(wled->dev, "Failed to configure SINK %d rc=%d\n",
625 i + 1, rc);
626 goto failed_detect;
627 }
628
629 /* Enable the module */
630 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
631 WLED3_CTRL_REG_MOD_EN,
632 WLED3_CTRL_REG_MOD_EN_MASK,
633 WLED3_CTRL_REG_MOD_EN_MASK);
634 if (rc < 0) {
635 dev_err(wled->dev, "Failed to enable WLED module rc=%d\n",
636 rc);
637 goto failed_detect;
638 }
639
640 delay_time_us = wled->wled_ovp_delay(wled);
641 usleep_range(delay_time_us, delay_time_us + 1000);
642
643 rc = wled_ovp_fault_status(wled, &fault_set);
644 if (rc < 0) {
645 dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
646 rc);
647 goto failed_detect;
648 }
649
650 if (fault_set)
651 dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n",
652 i + 1);
653 else
654 sink_valid |= sink_test;
655
656 /* Disable the module */
657 rc = regmap_update_bits(wled->regmap,
658 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
659 WLED3_CTRL_REG_MOD_EN_MASK, 0);
660 if (rc < 0) {
661 dev_err(wled->dev, "Failed to disable WLED module rc=%d\n",
662 rc);
663 goto failed_detect;
664 }
665 }
666
667 if (!sink_valid) {
668 dev_err(wled->dev, "No valid WLED sinks found\n");
669 wled->disabled_by_short = true;
670 goto failed_detect;
671 }
672
673 if (sink_valid != sink_config) {
674 dev_warn(wled->dev, "%x is not a valid sink configuration - using %x instead\n",
675 sink_config, sink_valid);
676 sink_config = sink_valid;
677 }
678
679 /* Write the new sink configuration */
680 rc = regmap_write(wled->regmap,
681 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
682 sink_config);
683 if (rc < 0) {
684 dev_err(wled->dev, "Failed to reconfigure the default sink rc=%d\n",
685 rc);
686 goto failed_detect;
687 }
688
689 /* Enable valid sinks */
690 if (wled->version == 4) {
691 for (i = 0; i < wled->cfg.num_strings; i++) {
692 if (sink_config &
693 BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i))
694 val = WLED4_SINK_REG_STR_MOD_MASK;
695 else
696 /* Disable modulator_en for unused sink */
697 val = 0;
698
699 rc = regmap_write(wled->regmap, wled->sink_addr +
700 WLED4_SINK_REG_STR_MOD_EN(i), val);
701 if (rc < 0) {
702 dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n",
703 rc);
704 goto failed_detect;
705 }
706 }
707 }
708
709 /* Enable CABC */
710 rc = wled->wled_cabc_config(wled, true);
711 if (rc < 0)
712 goto failed_detect;
713
714 /* Restore the feedback setting */
715 rc = regmap_write(wled->regmap,
716 wled->ctrl_addr + WLED3_CTRL_REG_FEEDBACK_CONTROL, 0);
717 if (rc < 0) {
718 dev_err(wled->dev, "Failed to restore feedback setting rc=%d\n",
719 rc);
720 goto failed_detect;
721 }
722
723 /* Restore brightness */
724 rc = wled4_set_brightness(wled, wled->brightness);
725 if (rc < 0) {
726 dev_err(wled->dev, "Failed to set brightness after auto detection rc=%d\n",
727 rc);
728 goto failed_detect;
729 }
730
731 rc = regmap_update_bits(wled->regmap,
732 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
733 WLED3_CTRL_REG_MOD_EN_MASK,
734 WLED3_CTRL_REG_MOD_EN_MASK);
735 if (rc < 0) {
736 dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", rc);
737 goto failed_detect;
738 }
739
740 failed_detect:
741 return;
742 }
743
744 #define WLED_AUTO_DETECT_OVP_COUNT 5
745 #define WLED_AUTO_DETECT_CNT_DLY_US USEC_PER_SEC
746
747 static bool wled4_auto_detection_required(struct wled *wled)
748 {
749 s64 elapsed_time_us;
750
751 if (!wled->cfg.auto_detection_enabled)
752 return false;
753
754 /*
755 * Check if the OVP fault was an occasional one
756 * or if it's firing continuously, the latter qualifies
757 * for an auto-detection check.
758 */
759 if (!wled->auto_detection_ovp_count) {
760 wled->start_ovp_fault_time = ktime_get();
761 wled->auto_detection_ovp_count++;
762 } else {
763 elapsed_time_us = ktime_us_delta(ktime_get(),
764 wled->start_ovp_fault_time);
765 if (elapsed_time_us > WLED_AUTO_DETECT_CNT_DLY_US)
766 wled->auto_detection_ovp_count = 0;
767 else
768 wled->auto_detection_ovp_count++;
769
770 if (wled->auto_detection_ovp_count >=
771 WLED_AUTO_DETECT_OVP_COUNT) {
772 wled->auto_detection_ovp_count = 0;
773 return true;
774 }
775 }
776
777 return false;
778 }
779
780 static bool wled5_auto_detection_required(struct wled *wled)
781 {
782 if (!wled->cfg.auto_detection_enabled)
783 return false;
784
785 /*
786 * Unlike WLED4, WLED5 has OVP fault density interrupt configuration
787 * i.e. to count the number of OVP alarms for a certain duration before
788 * triggering OVP fault interrupt. By default, number of OVP fault
789 * events counted before an interrupt is fired is 32 and the time
790 * interval is 12 ms. If we see one OVP fault interrupt, then that
791 * should qualify for a real OVP fault condition to run auto detection
792 * algorithm.
793 */
794 return true;
795 }
796
797 static int wled_auto_detection_at_init(struct wled *wled)
798 {
799 int rc;
800 bool fault_set;
801
802 if (!wled->cfg.auto_detection_enabled)
803 return 0;
804
805 rc = wled_ovp_fault_status(wled, &fault_set);
806 if (rc < 0) {
807 dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
808 rc);
809 return rc;
810 }
811
812 if (fault_set) {
813 mutex_lock(&wled->lock);
814 wled_auto_string_detection(wled);
815 mutex_unlock(&wled->lock);
816 }
817
818 return rc;
819 }
820
821 static irqreturn_t wled_ovp_irq_handler(int irq, void *_wled)
822 {
823 struct wled *wled = _wled;
824 int rc;
825 u32 int_sts, fault_sts;
826
827 rc = regmap_read(wled->regmap,
828 wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, &int_sts);
829 if (rc < 0) {
830 dev_err(wled->dev, "Error in reading WLED3_INT_RT_STS rc=%d\n",
831 rc);
832 return IRQ_HANDLED;
833 }
834
835 rc = regmap_read(wled->regmap, wled->ctrl_addr +
836 WLED3_CTRL_REG_FAULT_STATUS, &fault_sts);
837 if (rc < 0) {
838 dev_err(wled->dev, "Error in reading WLED_FAULT_STATUS rc=%d\n",
839 rc);
840 return IRQ_HANDLED;
841 }
842
843 if (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT |
844 WLED3_CTRL_REG_ILIM_FAULT_BIT))
845 dev_dbg(wled->dev, "WLED OVP fault detected, int_sts=%x fault_sts= %x\n",
846 int_sts, fault_sts);
847
848 if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT) {
849 if (wled->wled_auto_detection_required(wled)) {
850 mutex_lock(&wled->lock);
851 wled_auto_string_detection(wled);
852 mutex_unlock(&wled->lock);
853 }
854 }
855
856 return IRQ_HANDLED;
857 }
858
859 static int wled3_setup(struct wled *wled)
860 {
861 u16 addr;
862 u8 sink_en = 0;
863 int rc, i, j;
864
865 rc = regmap_update_bits(wled->regmap,
866 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
867 WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
868 if (rc)
869 return rc;
870
871 rc = regmap_update_bits(wled->regmap,
872 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
873 WLED3_CTRL_REG_ILIMIT_MASK,
874 wled->cfg.boost_i_limit);
875 if (rc)
876 return rc;
877
878 rc = regmap_update_bits(wled->regmap,
879 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
880 WLED3_CTRL_REG_FREQ_MASK,
881 wled->cfg.switch_freq);
882 if (rc)
883 return rc;
884
885 for (i = 0; i < wled->cfg.num_strings; ++i) {
886 j = wled->cfg.enabled_strings[i];
887 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
888 rc = regmap_update_bits(wled->regmap, addr,
889 WLED3_SINK_REG_STR_MOD_MASK,
890 WLED3_SINK_REG_STR_MOD_MASK);
891 if (rc)
892 return rc;
893
894 if (wled->cfg.ext_gen) {
895 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
896 rc = regmap_update_bits(wled->regmap, addr,
897 WLED3_SINK_REG_STR_MOD_SRC_MASK,
898 WLED3_SINK_REG_STR_MOD_SRC_EXT);
899 if (rc)
900 return rc;
901 }
902
903 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
904 rc = regmap_update_bits(wled->regmap, addr,
905 WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
906 wled->cfg.string_i_limit);
907 if (rc)
908 return rc;
909
910 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
911 rc = regmap_update_bits(wled->regmap, addr,
912 WLED3_SINK_REG_STR_CABC_MASK,
913 wled->cfg.cabc ?
914 WLED3_SINK_REG_STR_CABC_MASK : 0);
915 if (rc)
916 return rc;
917
918 sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
919 }
920
921 rc = regmap_update_bits(wled->regmap,
922 wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
923 WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
924 if (rc)
925 return rc;
926
927 return 0;
928 }
929
930 static const struct wled_config wled3_config_defaults = {
931 .boost_i_limit = 3,
932 .string_i_limit = 20,
933 .ovp = 2,
934 .num_strings = 3,
935 .switch_freq = 5,
936 .cs_out_en = false,
937 .ext_gen = false,
938 .cabc = false,
939 .enabled_strings = {0, 1, 2, 3},
940 };
941
942 static int wled4_setup(struct wled *wled)
943 {
944 int rc, temp, i, j;
945 u16 addr;
946 u8 sink_en = 0;
947 u32 sink_cfg;
948
949 rc = regmap_update_bits(wled->regmap,
950 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
951 WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
952 if (rc < 0)
953 return rc;
954
955 rc = regmap_update_bits(wled->regmap,
956 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
957 WLED3_CTRL_REG_ILIMIT_MASK,
958 wled->cfg.boost_i_limit);
959 if (rc < 0)
960 return rc;
961
962 rc = regmap_update_bits(wled->regmap,
963 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
964 WLED3_CTRL_REG_FREQ_MASK,
965 wled->cfg.switch_freq);
966 if (rc < 0)
967 return rc;
968
969 if (wled->cfg.external_pfet) {
970 /* Unlock the secure register access */
971 rc = regmap_write(wled->regmap, wled->ctrl_addr +
972 WLED4_CTRL_REG_SEC_ACCESS,
973 WLED4_CTRL_REG_SEC_UNLOCK);
974 if (rc < 0)
975 return rc;
976
977 rc = regmap_write(wled->regmap,
978 wled->ctrl_addr + WLED4_CTRL_REG_TEST1,
979 WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2);
980 if (rc < 0)
981 return rc;
982 }
983
984 rc = regmap_read(wled->regmap, wled->sink_addr +
985 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
986 if (rc < 0)
987 return rc;
988
989 for (i = 0; i < wled->cfg.num_strings; i++) {
990 j = wled->cfg.enabled_strings[i];
991 temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
992 sink_en |= 1 << temp;
993 }
994
995 if (sink_cfg == sink_en) {
996 rc = wled_auto_detection_at_init(wled);
997 return rc;
998 }
999
1000 rc = regmap_update_bits(wled->regmap,
1001 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1002 WLED4_SINK_REG_CURR_SINK_MASK, 0);
1003 if (rc < 0)
1004 return rc;
1005
1006 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1007 WLED3_CTRL_REG_MOD_EN,
1008 WLED3_CTRL_REG_MOD_EN_MASK, 0);
1009 if (rc < 0)
1010 return rc;
1011
1012 /* Per sink/string configuration */
1013 for (i = 0; i < wled->cfg.num_strings; i++) {
1014 j = wled->cfg.enabled_strings[i];
1015
1016 addr = wled->sink_addr +
1017 WLED4_SINK_REG_STR_MOD_EN(j);
1018 rc = regmap_update_bits(wled->regmap, addr,
1019 WLED4_SINK_REG_STR_MOD_MASK,
1020 WLED4_SINK_REG_STR_MOD_MASK);
1021 if (rc < 0)
1022 return rc;
1023
1024 addr = wled->sink_addr +
1025 WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
1026 rc = regmap_update_bits(wled->regmap, addr,
1027 WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
1028 wled->cfg.string_i_limit);
1029 if (rc < 0)
1030 return rc;
1031 }
1032
1033 rc = wled4_cabc_config(wled, wled->cfg.cabc);
1034 if (rc < 0)
1035 return rc;
1036
1037 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1038 WLED3_CTRL_REG_MOD_EN,
1039 WLED3_CTRL_REG_MOD_EN_MASK,
1040 WLED3_CTRL_REG_MOD_EN_MASK);
1041 if (rc < 0)
1042 return rc;
1043
1044 rc = regmap_update_bits(wled->regmap,
1045 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1046 WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
1047 if (rc < 0)
1048 return rc;
1049
1050 rc = wled->wled_sync_toggle(wled);
1051 if (rc < 0) {
1052 dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
1053 return rc;
1054 }
1055
1056 rc = wled_auto_detection_at_init(wled);
1057
1058 return rc;
1059 }
1060
1061 static const struct wled_config wled4_config_defaults = {
1062 .boost_i_limit = 4,
1063 .string_i_limit = 10,
1064 .ovp = 1,
1065 .num_strings = 4,
1066 .switch_freq = 11,
1067 .cabc = false,
1068 .external_pfet = false,
1069 .auto_detection_enabled = false,
1070 };
1071
1072 static int wled5_setup(struct wled *wled)
1073 {
1074 int rc, temp, i, j, offset;
1075 u8 sink_en = 0;
1076 u16 addr;
1077 u32 val;
1078
1079 rc = regmap_update_bits(wled->regmap,
1080 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
1081 WLED5_CTRL_REG_OVP_MASK, wled->cfg.ovp);
1082 if (rc < 0)
1083 return rc;
1084
1085 rc = regmap_update_bits(wled->regmap,
1086 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
1087 WLED3_CTRL_REG_ILIMIT_MASK,
1088 wled->cfg.boost_i_limit);
1089 if (rc < 0)
1090 return rc;
1091
1092 rc = regmap_update_bits(wled->regmap,
1093 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
1094 WLED3_CTRL_REG_FREQ_MASK,
1095 wled->cfg.switch_freq);
1096 if (rc < 0)
1097 return rc;
1098
1099 /* Per sink/string configuration */
1100 for (i = 0; i < wled->cfg.num_strings; ++i) {
1101 j = wled->cfg.enabled_strings[i];
1102 addr = wled->sink_addr +
1103 WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
1104 rc = regmap_update_bits(wled->regmap, addr,
1105 WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
1106 wled->cfg.string_i_limit);
1107 if (rc < 0)
1108 return rc;
1109
1110 addr = wled->sink_addr + WLED5_SINK_REG_STR_SRC_SEL(j);
1111 rc = regmap_update_bits(wled->regmap, addr,
1112 WLED5_SINK_REG_SRC_SEL_MASK,
1113 wled->cfg.mod_sel == MOD_A ?
1114 WLED5_SINK_REG_SRC_SEL_MOD_A :
1115 WLED5_SINK_REG_SRC_SEL_MOD_B);
1116
1117 temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
1118 sink_en |= 1 << temp;
1119 }
1120
1121 rc = wled5_cabc_config(wled, wled->cfg.cabc_sel ? true : false);
1122 if (rc < 0)
1123 return rc;
1124
1125 /* Enable one of the modulators A or B based on mod_sel */
1126 addr = wled->sink_addr + WLED5_SINK_REG_MOD_A_EN;
1127 val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
1128 rc = regmap_update_bits(wled->regmap, addr,
1129 WLED5_SINK_REG_MOD_EN_MASK, val);
1130 if (rc < 0)
1131 return rc;
1132
1133 addr = wled->sink_addr + WLED5_SINK_REG_MOD_B_EN;
1134 val = (wled->cfg.mod_sel == MOD_B) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
1135 rc = regmap_update_bits(wled->regmap, addr,
1136 WLED5_SINK_REG_MOD_EN_MASK, val);
1137 if (rc < 0)
1138 return rc;
1139
1140 offset = (wled->cfg.mod_sel == MOD_A) ?
1141 WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL :
1142 WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL;
1143
1144 addr = wled->sink_addr + offset;
1145 val = (wled->max_brightness == WLED5_SINK_REG_BRIGHT_MAX_15B) ?
1146 WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B :
1147 WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B;
1148 rc = regmap_write(wled->regmap, addr, val);
1149 if (rc < 0)
1150 return rc;
1151
1152 rc = regmap_update_bits(wled->regmap,
1153 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1154 WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
1155 if (rc < 0)
1156 return rc;
1157
1158 /* This updates only FSC configuration in WLED5 */
1159 rc = wled->wled_sync_toggle(wled);
1160 if (rc < 0) {
1161 pr_err("Failed to toggle sync reg rc:%d\n", rc);
1162 return rc;
1163 }
1164
1165 rc = wled_auto_detection_at_init(wled);
1166 if (rc < 0)
1167 return rc;
1168
1169 return 0;
1170 }
1171
1172 static const struct wled_config wled5_config_defaults = {
1173 .boost_i_limit = 5,
1174 .string_i_limit = 10,
1175 .ovp = 4,
1176 .num_strings = 4,
1177 .switch_freq = 11,
1178 .mod_sel = 0,
1179 .cabc_sel = 0,
1180 .cabc = false,
1181 .external_pfet = false,
1182 .auto_detection_enabled = false,
1183 };
1184
1185 static const u32 wled3_boost_i_limit_values[] = {
1186 105, 385, 525, 805, 980, 1260, 1400, 1680,
1187 };
1188
1189 static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
1190 .values = wled3_boost_i_limit_values,
1191 .size = ARRAY_SIZE(wled3_boost_i_limit_values),
1192 };
1193
1194 static const u32 wled4_boost_i_limit_values[] = {
1195 105, 280, 450, 620, 970, 1150, 1300, 1500,
1196 };
1197
1198 static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
1199 .values = wled4_boost_i_limit_values,
1200 .size = ARRAY_SIZE(wled4_boost_i_limit_values),
1201 };
1202
1203 static inline u32 wled5_boost_i_limit_values_fn(u32 idx)
1204 {
1205 return 525 + (idx * 175);
1206 }
1207
1208 static const struct wled_var_cfg wled5_boost_i_limit_cfg = {
1209 .fn = wled5_boost_i_limit_values_fn,
1210 .size = 8,
1211 };
1212
1213 static const u32 wled3_ovp_values[] = {
1214 35, 32, 29, 27,
1215 };
1216
1217 static const struct wled_var_cfg wled3_ovp_cfg = {
1218 .values = wled3_ovp_values,
1219 .size = ARRAY_SIZE(wled3_ovp_values),
1220 };
1221
1222 static const u32 wled4_ovp_values[] = {
1223 31100, 29600, 19600, 18100,
1224 };
1225
1226 static const struct wled_var_cfg wled4_ovp_cfg = {
1227 .values = wled4_ovp_values,
1228 .size = ARRAY_SIZE(wled4_ovp_values),
1229 };
1230
1231 static inline u32 wled5_ovp_values_fn(u32 idx)
1232 {
1233 /*
1234 * 0000 - 38.5 V
1235 * 0001 - 37 V ..
1236 * 1111 - 16 V
1237 */
1238 return 38500 - (idx * 1500);
1239 }
1240
1241 static const struct wled_var_cfg wled5_ovp_cfg = {
1242 .fn = wled5_ovp_values_fn,
1243 .size = 16,
1244 };
1245
1246 static u32 wled3_num_strings_values_fn(u32 idx)
1247 {
1248 return idx + 1;
1249 }
1250
1251 static const struct wled_var_cfg wled3_num_strings_cfg = {
1252 .fn = wled3_num_strings_values_fn,
1253 .size = 3,
1254 };
1255
1256 static const struct wled_var_cfg wled4_num_strings_cfg = {
1257 .fn = wled3_num_strings_values_fn,
1258 .size = 4,
1259 };
1260
1261 static u32 wled3_switch_freq_values_fn(u32 idx)
1262 {
1263 return 19200 / (2 * (1 + idx));
1264 }
1265
1266 static const struct wled_var_cfg wled3_switch_freq_cfg = {
1267 .fn = wled3_switch_freq_values_fn,
1268 .size = 16,
1269 };
1270
1271 static const struct wled_var_cfg wled3_string_i_limit_cfg = {
1272 .size = 26,
1273 };
1274
1275 static const u32 wled4_string_i_limit_values[] = {
1276 0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
1277 22500, 25000, 27500, 30000,
1278 };
1279
1280 static const struct wled_var_cfg wled4_string_i_limit_cfg = {
1281 .values = wled4_string_i_limit_values,
1282 .size = ARRAY_SIZE(wled4_string_i_limit_values),
1283 };
1284
1285 static const struct wled_var_cfg wled5_mod_sel_cfg = {
1286 .size = 2,
1287 };
1288
1289 static const struct wled_var_cfg wled5_cabc_sel_cfg = {
1290 .size = 4,
1291 };
1292
1293 static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
1294 {
1295 if (idx >= cfg->size)
1296 return UINT_MAX;
1297 if (cfg->fn)
1298 return cfg->fn(idx);
1299 if (cfg->values)
1300 return cfg->values[idx];
1301 return idx;
1302 }
1303
1304 static int wled_configure(struct wled *wled)
1305 {
1306 struct wled_config *cfg = &wled->cfg;
1307 struct device *dev = wled->dev;
1308 const __be32 *prop_addr;
1309 u32 size, val, c;
1310 int rc, i, j, string_len;
1311
1312 const struct wled_u32_opts *u32_opts = NULL;
1313 const struct wled_u32_opts wled3_opts[] = {
1314 {
1315 .name = "qcom,current-boost-limit",
1316 .val_ptr = &cfg->boost_i_limit,
1317 .cfg = &wled3_boost_i_limit_cfg,
1318 },
1319 {
1320 .name = "qcom,current-limit",
1321 .val_ptr = &cfg->string_i_limit,
1322 .cfg = &wled3_string_i_limit_cfg,
1323 },
1324 {
1325 .name = "qcom,ovp",
1326 .val_ptr = &cfg->ovp,
1327 .cfg = &wled3_ovp_cfg,
1328 },
1329 {
1330 .name = "qcom,switching-freq",
1331 .val_ptr = &cfg->switch_freq,
1332 .cfg = &wled3_switch_freq_cfg,
1333 },
1334 {
1335 .name = "qcom,num-strings",
1336 .val_ptr = &cfg->num_strings,
1337 .cfg = &wled3_num_strings_cfg,
1338 },
1339 };
1340
1341 const struct wled_u32_opts wled4_opts[] = {
1342 {
1343 .name = "qcom,current-boost-limit",
1344 .val_ptr = &cfg->boost_i_limit,
1345 .cfg = &wled4_boost_i_limit_cfg,
1346 },
1347 {
1348 .name = "qcom,current-limit-microamp",
1349 .val_ptr = &cfg->string_i_limit,
1350 .cfg = &wled4_string_i_limit_cfg,
1351 },
1352 {
1353 .name = "qcom,ovp-millivolt",
1354 .val_ptr = &cfg->ovp,
1355 .cfg = &wled4_ovp_cfg,
1356 },
1357 {
1358 .name = "qcom,switching-freq",
1359 .val_ptr = &cfg->switch_freq,
1360 .cfg = &wled3_switch_freq_cfg,
1361 },
1362 {
1363 .name = "qcom,num-strings",
1364 .val_ptr = &cfg->num_strings,
1365 .cfg = &wled4_num_strings_cfg,
1366 },
1367 };
1368
1369 const struct wled_u32_opts wled5_opts[] = {
1370 {
1371 .name = "qcom,current-boost-limit",
1372 .val_ptr = &cfg->boost_i_limit,
1373 .cfg = &wled5_boost_i_limit_cfg,
1374 },
1375 {
1376 .name = "qcom,current-limit-microamp",
1377 .val_ptr = &cfg->string_i_limit,
1378 .cfg = &wled4_string_i_limit_cfg,
1379 },
1380 {
1381 .name = "qcom,ovp-millivolt",
1382 .val_ptr = &cfg->ovp,
1383 .cfg = &wled5_ovp_cfg,
1384 },
1385 {
1386 .name = "qcom,switching-freq",
1387 .val_ptr = &cfg->switch_freq,
1388 .cfg = &wled3_switch_freq_cfg,
1389 },
1390 {
1391 .name = "qcom,num-strings",
1392 .val_ptr = &cfg->num_strings,
1393 .cfg = &wled4_num_strings_cfg,
1394 },
1395 {
1396 .name = "qcom,modulator-sel",
1397 .val_ptr = &cfg->mod_sel,
1398 .cfg = &wled5_mod_sel_cfg,
1399 },
1400 {
1401 .name = "qcom,cabc-sel",
1402 .val_ptr = &cfg->cabc_sel,
1403 .cfg = &wled5_cabc_sel_cfg,
1404 },
1405 };
1406
1407 const struct wled_bool_opts bool_opts[] = {
1408 { "qcom,cs-out", &cfg->cs_out_en, },
1409 { "qcom,ext-gen", &cfg->ext_gen, },
1410 { "qcom,cabc", &cfg->cabc, },
1411 { "qcom,external-pfet", &cfg->external_pfet, },
1412 { "qcom,auto-string-detection", &cfg->auto_detection_enabled, },
1413 };
1414
1415 prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
1416 if (!prop_addr) {
1417 dev_err(wled->dev, "invalid IO resources\n");
1418 return -EINVAL;
1419 }
1420 wled->ctrl_addr = be32_to_cpu(*prop_addr);
1421
1422 rc = of_property_read_string(dev->of_node, "label", &wled->name);
1423 if (rc)
1424 wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
1425
1426 switch (wled->version) {
1427 case 3:
1428 u32_opts = wled3_opts;
1429 size = ARRAY_SIZE(wled3_opts);
1430 *cfg = wled3_config_defaults;
1431 wled->wled_set_brightness = wled3_set_brightness;
1432 wled->wled_sync_toggle = wled3_sync_toggle;
1433 wled->max_string_count = 3;
1434 wled->sink_addr = wled->ctrl_addr;
1435 break;
1436
1437 case 4:
1438 u32_opts = wled4_opts;
1439 size = ARRAY_SIZE(wled4_opts);
1440 *cfg = wled4_config_defaults;
1441 wled->wled_set_brightness = wled4_set_brightness;
1442 wled->wled_sync_toggle = wled3_sync_toggle;
1443 wled->wled_cabc_config = wled4_cabc_config;
1444 wled->wled_ovp_delay = wled4_ovp_delay;
1445 wled->wled_auto_detection_required =
1446 wled4_auto_detection_required;
1447 wled->max_string_count = 4;
1448
1449 prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
1450 if (!prop_addr) {
1451 dev_err(wled->dev, "invalid IO resources\n");
1452 return -EINVAL;
1453 }
1454 wled->sink_addr = be32_to_cpu(*prop_addr);
1455 break;
1456
1457 case 5:
1458 u32_opts = wled5_opts;
1459 size = ARRAY_SIZE(wled5_opts);
1460 *cfg = wled5_config_defaults;
1461 wled->wled_set_brightness = wled5_set_brightness;
1462 wled->wled_sync_toggle = wled5_sync_toggle;
1463 wled->wled_cabc_config = wled5_cabc_config;
1464 wled->wled_ovp_delay = wled5_ovp_delay;
1465 wled->wled_auto_detection_required =
1466 wled5_auto_detection_required;
1467 wled->max_string_count = 4;
1468
1469 prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
1470 if (!prop_addr) {
1471 dev_err(wled->dev, "invalid IO resources\n");
1472 return -EINVAL;
1473 }
1474 wled->sink_addr = be32_to_cpu(*prop_addr);
1475 break;
1476
1477 default:
1478 dev_err(wled->dev, "Invalid WLED version\n");
1479 return -EINVAL;
1480 }
1481
1482 for (i = 0; i < size; ++i) {
1483 rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
1484 if (rc == -EINVAL) {
1485 continue;
1486 } else if (rc) {
1487 dev_err(dev, "error reading '%s'\n", u32_opts[i].name);
1488 return rc;
1489 }
1490
1491 c = UINT_MAX;
1492 for (j = 0; c != val; j++) {
1493 c = wled_values(u32_opts[i].cfg, j);
1494 if (c == UINT_MAX) {
1495 dev_err(dev, "invalid value for '%s'\n",
1496 u32_opts[i].name);
1497 return -EINVAL;
1498 }
1499
1500 if (c == val)
1501 break;
1502 }
1503
1504 dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
1505 *u32_opts[i].val_ptr = j;
1506 }
1507
1508 for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) {
1509 if (of_property_read_bool(dev->of_node, bool_opts[i].name))
1510 *bool_opts[i].val_ptr = true;
1511 }
1512
1513 cfg->num_strings = cfg->num_strings + 1;
1514
1515 string_len = of_property_count_elems_of_size(dev->of_node,
1516 "qcom,enabled-strings",
1517 sizeof(u32));
1518 if (string_len > 0)
1519 of_property_read_u32_array(dev->of_node,
1520 "qcom,enabled-strings",
1521 wled->cfg.enabled_strings,
1522 sizeof(u32));
1523
1524 return 0;
1525 }
1526
1527 static int wled_configure_short_irq(struct wled *wled,
1528 struct platform_device *pdev)
1529 {
1530 int rc;
1531
1532 if (!wled->has_short_detect)
1533 return 0;
1534
1535 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1536 WLED4_CTRL_REG_SHORT_PROTECT,
1537 WLED4_CTRL_REG_SHORT_EN_MASK,
1538 WLED4_CTRL_REG_SHORT_EN_MASK);
1539 if (rc < 0)
1540 return rc;
1541
1542 wled->short_irq = platform_get_irq_byname(pdev, "short");
1543 if (wled->short_irq < 0) {
1544 dev_dbg(&pdev->dev, "short irq is not used\n");
1545 return 0;
1546 }
1547
1548 rc = devm_request_threaded_irq(wled->dev, wled->short_irq,
1549 NULL, wled_short_irq_handler,
1550 IRQF_ONESHOT,
1551 "wled_short_irq", wled);
1552 if (rc < 0)
1553 dev_err(wled->dev, "Unable to request short_irq (err:%d)\n",
1554 rc);
1555
1556 return rc;
1557 }
1558
1559 static int wled_configure_ovp_irq(struct wled *wled,
1560 struct platform_device *pdev)
1561 {
1562 int rc;
1563 u32 val;
1564
1565 wled->ovp_irq = platform_get_irq_byname(pdev, "ovp");
1566 if (wled->ovp_irq < 0) {
1567 dev_dbg(&pdev->dev, "OVP IRQ not found - disabling automatic string detection\n");
1568 return 0;
1569 }
1570
1571 rc = devm_request_threaded_irq(wled->dev, wled->ovp_irq, NULL,
1572 wled_ovp_irq_handler, IRQF_ONESHOT,
1573 "wled_ovp_irq", wled);
1574 if (rc < 0) {
1575 dev_err(wled->dev, "Unable to request ovp_irq (err:%d)\n",
1576 rc);
1577 wled->ovp_irq = 0;
1578 return 0;
1579 }
1580
1581 rc = regmap_read(wled->regmap, wled->ctrl_addr +
1582 WLED3_CTRL_REG_MOD_EN, &val);
1583 if (rc < 0)
1584 return rc;
1585
1586 /* Keep OVP irq disabled until module is enabled */
1587 if (!(val & WLED3_CTRL_REG_MOD_EN_MASK))
1588 disable_irq(wled->ovp_irq);
1589
1590 return 0;
1591 }
1592
1593 static const struct backlight_ops wled_ops = {
1594 .update_status = wled_update_status,
1595 };
1596
1597 static int wled_probe(struct platform_device *pdev)
1598 {
1599 struct backlight_properties props;
1600 struct backlight_device *bl;
1601 struct wled *wled;
1602 struct regmap *regmap;
1603 u32 val;
1604 int rc;
1605
1606 regmap = dev_get_regmap(pdev->dev.parent, NULL);
1607 if (!regmap) {
1608 dev_err(&pdev->dev, "Unable to get regmap\n");
1609 return -EINVAL;
1610 }
1611
1612 wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL);
1613 if (!wled)
1614 return -ENOMEM;
1615
1616 wled->regmap = regmap;
1617 wled->dev = &pdev->dev;
1618
1619 wled->version = (uintptr_t)of_device_get_match_data(&pdev->dev);
1620 if (!wled->version) {
1621 dev_err(&pdev->dev, "Unknown device version\n");
1622 return -ENODEV;
1623 }
1624
1625 mutex_init(&wled->lock);
1626 rc = wled_configure(wled);
1627 if (rc)
1628 return rc;
1629
1630 val = WLED3_SINK_REG_BRIGHT_MAX;
1631 of_property_read_u32(pdev->dev.of_node, "max-brightness", &val);
1632 wled->max_brightness = val;
1633
1634 switch (wled->version) {
1635 case 3:
1636 wled->cfg.auto_detection_enabled = false;
1637 rc = wled3_setup(wled);
1638 if (rc) {
1639 dev_err(&pdev->dev, "wled3_setup failed\n");
1640 return rc;
1641 }
1642 break;
1643
1644 case 4:
1645 wled->has_short_detect = true;
1646 rc = wled4_setup(wled);
1647 if (rc) {
1648 dev_err(&pdev->dev, "wled4_setup failed\n");
1649 return rc;
1650 }
1651 break;
1652
1653 case 5:
1654 wled->has_short_detect = true;
1655 if (wled->cfg.cabc_sel)
1656 wled->max_brightness = WLED5_SINK_REG_BRIGHT_MAX_12B;
1657
1658 rc = wled5_setup(wled);
1659 if (rc) {
1660 dev_err(&pdev->dev, "wled5_setup failed\n");
1661 return rc;
1662 }
1663 break;
1664
1665 default:
1666 dev_err(wled->dev, "Invalid WLED version\n");
1667 break;
1668 }
1669
1670 INIT_DELAYED_WORK(&wled->ovp_work, wled_ovp_work);
1671
1672 rc = wled_configure_short_irq(wled, pdev);
1673 if (rc < 0)
1674 return rc;
1675
1676 rc = wled_configure_ovp_irq(wled, pdev);
1677 if (rc < 0)
1678 return rc;
1679
1680 val = WLED_DEFAULT_BRIGHTNESS;
1681 of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
1682
1683 memset(&props, 0, sizeof(struct backlight_properties));
1684 props.type = BACKLIGHT_RAW;
1685 props.brightness = val;
1686 props.max_brightness = wled->max_brightness;
1687 bl = devm_backlight_device_register(&pdev->dev, wled->name,
1688 &pdev->dev, wled,
1689 &wled_ops, &props);
1690 return PTR_ERR_OR_ZERO(bl);
1691 };
1692
1693 static int wled_remove(struct platform_device *pdev)
1694 {
1695 struct wled *wled = dev_get_drvdata(&pdev->dev);
1696
1697 mutex_destroy(&wled->lock);
1698 cancel_delayed_work_sync(&wled->ovp_work);
1699 disable_irq(wled->short_irq);
1700 disable_irq(wled->ovp_irq);
1701
1702 return 0;
1703 }
1704
1705 static const struct of_device_id wled_match_table[] = {
1706 { .compatible = "qcom,pm8941-wled", .data = (void *)3 },
1707 { .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
1708 { .compatible = "qcom,pm660l-wled", .data = (void *)4 },
1709 { .compatible = "qcom,pm8150l-wled", .data = (void *)5 },
1710 {}
1711 };
1712 MODULE_DEVICE_TABLE(of, wled_match_table);
1713
1714 static struct platform_driver wled_driver = {
1715 .probe = wled_probe,
1716 .remove = wled_remove,
1717 .driver = {
1718 .name = "qcom,wled",
1719 .of_match_table = wled_match_table,
1720 },
1721 };
1722
1723 module_platform_driver(wled_driver);
1724
1725 MODULE_DESCRIPTION("Qualcomm WLED driver");
1726 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support