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_address.h>
13 #include <linux/platform_device.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
wled3_set_brightness(struct wled * wled,u16 brightness)231 static int wled3_set_brightness(struct wled *wled, u16 brightness)
232 {
233 int rc, i;
234 __le16 v;
235
236 v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
237
238 for (i = 0; i < wled->cfg.num_strings; ++i) {
239 rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
240 WLED3_SINK_REG_BRIGHT(wled->cfg.enabled_strings[i]),
241 &v, sizeof(v));
242 if (rc < 0)
243 return rc;
244 }
245
246 return 0;
247 }
248
wled4_set_brightness(struct wled * wled,u16 brightness)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 __le16 v;
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 = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
260
261 for (i = 0; i < wled->cfg.num_strings; ++i) {
262 rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
263 WLED4_SINK_REG_BRIGHT(wled->cfg.enabled_strings[i]),
264 &v, sizeof(v));
265 if (rc < 0)
266 return rc;
267 }
268
269 return 0;
270 }
271
wled5_set_brightness(struct wled * wled,u16 brightness)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 __le16 v;
277
278 /* WLED5's lower limit is 0.1% */
279 if (brightness < low_limit)
280 brightness = low_limit;
281
282 v = cpu_to_le16(brightness & WLED5_SINK_REG_BRIGHT_MAX_15B);
283
284 offset = (wled->cfg.mod_sel == MOD_A) ?
285 WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB :
286 WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB;
287
288 rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
289 &v, sizeof(v));
290 return rc;
291 }
292
wled_ovp_work(struct work_struct * work)293 static void wled_ovp_work(struct work_struct *work)
294 {
295 struct wled *wled = container_of(work,
296 struct wled, ovp_work.work);
297 enable_irq(wled->ovp_irq);
298 }
299
wled_module_enable(struct wled * wled,int val)300 static int wled_module_enable(struct wled *wled, int val)
301 {
302 int rc;
303
304 if (wled->disabled_by_short)
305 return -ENXIO;
306
307 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
308 WLED3_CTRL_REG_MOD_EN,
309 WLED3_CTRL_REG_MOD_EN_MASK,
310 val << WLED3_CTRL_REG_MOD_EN_SHIFT);
311 if (rc < 0)
312 return rc;
313
314 if (wled->ovp_irq > 0) {
315 if (val) {
316 /*
317 * The hardware generates a storm of spurious OVP
318 * interrupts during soft start operations. So defer
319 * enabling the IRQ for 10ms to ensure that the
320 * soft start is complete.
321 */
322 schedule_delayed_work(&wled->ovp_work, HZ / 100);
323 } else {
324 if (!cancel_delayed_work_sync(&wled->ovp_work))
325 disable_irq(wled->ovp_irq);
326 }
327 }
328
329 return 0;
330 }
331
wled3_sync_toggle(struct wled * wled)332 static int wled3_sync_toggle(struct wled *wled)
333 {
334 int rc;
335 unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
336
337 rc = regmap_update_bits(wled->regmap,
338 wled->sink_addr + WLED3_SINK_REG_SYNC,
339 mask, WLED3_SINK_REG_SYNC_CLEAR);
340 if (rc < 0)
341 return rc;
342
343 rc = regmap_update_bits(wled->regmap,
344 wled->sink_addr + WLED3_SINK_REG_SYNC,
345 mask, mask);
346
347 return rc;
348 }
349
wled5_mod_sync_toggle(struct wled * wled)350 static int wled5_mod_sync_toggle(struct wled *wled)
351 {
352 int rc;
353 u8 val;
354
355 rc = regmap_update_bits(wled->regmap,
356 wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
357 WLED5_SINK_REG_SYNC_MASK, 0);
358 if (rc < 0)
359 return rc;
360
361 val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_SYNC_MOD_A_BIT :
362 WLED5_SINK_REG_SYNC_MOD_B_BIT;
363 return regmap_update_bits(wled->regmap,
364 wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
365 WLED5_SINK_REG_SYNC_MASK, val);
366 }
367
wled_ovp_fault_status(struct wled * wled,bool * fault_set)368 static int wled_ovp_fault_status(struct wled *wled, bool *fault_set)
369 {
370 int rc;
371 u32 int_rt_sts, fault_sts;
372
373 *fault_set = false;
374 rc = regmap_read(wled->regmap,
375 wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS,
376 &int_rt_sts);
377 if (rc < 0) {
378 dev_err(wled->dev, "Failed to read INT_RT_STS rc=%d\n", rc);
379 return rc;
380 }
381
382 rc = regmap_read(wled->regmap,
383 wled->ctrl_addr + WLED3_CTRL_REG_FAULT_STATUS,
384 &fault_sts);
385 if (rc < 0) {
386 dev_err(wled->dev, "Failed to read FAULT_STATUS rc=%d\n", rc);
387 return rc;
388 }
389
390 if (int_rt_sts & WLED3_CTRL_REG_OVP_FAULT_STATUS)
391 *fault_set = true;
392
393 if (wled->version == 4 && (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT))
394 *fault_set = true;
395
396 if (wled->version == 5 && (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT |
397 WLED5_CTRL_REG_OVP_PRE_ALARM_BIT)))
398 *fault_set = true;
399
400 if (*fault_set)
401 dev_dbg(wled->dev, "WLED OVP fault detected, int_rt_sts=0x%x fault_sts=0x%x\n",
402 int_rt_sts, fault_sts);
403
404 return rc;
405 }
406
wled4_ovp_delay(struct wled * wled)407 static int wled4_ovp_delay(struct wled *wled)
408 {
409 return WLED_SOFT_START_DLY_US;
410 }
411
wled5_ovp_delay(struct wled * wled)412 static int wled5_ovp_delay(struct wled *wled)
413 {
414 int rc, delay_us;
415 u32 val;
416 u8 ovp_timer_ms[8] = {1, 2, 4, 8, 12, 16, 20, 24};
417
418 /* For WLED5, get the delay based on OVP timer */
419 rc = regmap_read(wled->regmap, wled->ctrl_addr +
420 WLED5_CTRL_REG_OVP_INT_CTL, &val);
421 if (rc < 0)
422 delay_us =
423 ovp_timer_ms[val & WLED5_CTRL_REG_OVP_INT_TIMER_MASK] * 1000;
424 else
425 delay_us = 2 * WLED_SOFT_START_DLY_US;
426
427 dev_dbg(wled->dev, "delay_time_us: %d\n", delay_us);
428
429 return delay_us;
430 }
431
wled_update_status(struct backlight_device * bl)432 static int wled_update_status(struct backlight_device *bl)
433 {
434 struct wled *wled = bl_get_data(bl);
435 u16 brightness = backlight_get_brightness(bl);
436 int rc = 0;
437
438 mutex_lock(&wled->lock);
439 if (brightness) {
440 rc = wled->wled_set_brightness(wled, brightness);
441 if (rc < 0) {
442 dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
443 rc);
444 goto unlock_mutex;
445 }
446
447 if (wled->version < 5) {
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 } else {
454 /*
455 * For WLED5 toggling the MOD_SYNC_BIT updates the
456 * brightness
457 */
458 rc = wled5_mod_sync_toggle(wled);
459 if (rc < 0) {
460 dev_err(wled->dev, "wled mod sync failed rc:%d\n",
461 rc);
462 goto unlock_mutex;
463 }
464 }
465 }
466
467 if (!!brightness != !!wled->brightness) {
468 rc = wled_module_enable(wled, !!brightness);
469 if (rc < 0) {
470 dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
471 goto unlock_mutex;
472 }
473 }
474
475 wled->brightness = brightness;
476
477 unlock_mutex:
478 mutex_unlock(&wled->lock);
479
480 return rc;
481 }
482
wled4_cabc_config(struct wled * wled,bool enable)483 static int wled4_cabc_config(struct wled *wled, bool enable)
484 {
485 int i, j, rc;
486 u8 val;
487
488 for (i = 0; i < wled->cfg.num_strings; i++) {
489 j = wled->cfg.enabled_strings[i];
490
491 val = enable ? WLED4_SINK_REG_STR_CABC_MASK : 0;
492 rc = regmap_update_bits(wled->regmap, wled->sink_addr +
493 WLED4_SINK_REG_STR_CABC(j),
494 WLED4_SINK_REG_STR_CABC_MASK, val);
495 if (rc < 0)
496 return rc;
497 }
498
499 return 0;
500 }
501
wled5_cabc_config(struct wled * wled,bool enable)502 static int wled5_cabc_config(struct wled *wled, bool enable)
503 {
504 int rc, offset;
505 u8 reg;
506
507 if (wled->cabc_disabled)
508 return 0;
509
510 reg = enable ? wled->cfg.cabc_sel : 0;
511 offset = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_A_SRC_SEL :
512 WLED5_SINK_REG_MOD_B_SRC_SEL;
513
514 rc = regmap_update_bits(wled->regmap, wled->sink_addr + offset,
515 WLED5_SINK_REG_MOD_SRC_SEL_MASK, reg);
516 if (rc < 0) {
517 pr_err("Error in configuring CABC rc=%d\n", rc);
518 return rc;
519 }
520
521 if (!wled->cfg.cabc_sel)
522 wled->cabc_disabled = true;
523
524 return 0;
525 }
526
527 #define WLED_SHORT_DLY_MS 20
528 #define WLED_SHORT_CNT_MAX 5
529 #define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC
530
wled_short_irq_handler(int irq,void * _wled)531 static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
532 {
533 struct wled *wled = _wled;
534 int rc;
535 s64 elapsed_time;
536
537 wled->short_count++;
538 mutex_lock(&wled->lock);
539 rc = wled_module_enable(wled, false);
540 if (rc < 0) {
541 dev_err(wled->dev, "wled disable failed rc:%d\n", rc);
542 goto unlock_mutex;
543 }
544
545 elapsed_time = ktime_us_delta(ktime_get(),
546 wled->last_short_event);
547 if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US)
548 wled->short_count = 1;
549
550 if (wled->short_count > WLED_SHORT_CNT_MAX) {
551 dev_err(wled->dev, "Short triggered %d times, disabling WLED forever!\n",
552 wled->short_count);
553 wled->disabled_by_short = true;
554 goto unlock_mutex;
555 }
556
557 wled->last_short_event = ktime_get();
558
559 msleep(WLED_SHORT_DLY_MS);
560 rc = wled_module_enable(wled, true);
561 if (rc < 0)
562 dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
563
564 unlock_mutex:
565 mutex_unlock(&wled->lock);
566
567 return IRQ_HANDLED;
568 }
569
570 #define AUTO_DETECT_BRIGHTNESS 200
571
wled_auto_string_detection(struct wled * wled)572 static void wled_auto_string_detection(struct wled *wled)
573 {
574 int rc = 0, i, j, delay_time_us;
575 u32 sink_config = 0;
576 u8 sink_test = 0, sink_valid = 0, val;
577 bool fault_set;
578
579 /* Read configured sink configuration */
580 rc = regmap_read(wled->regmap, wled->sink_addr +
581 WLED4_SINK_REG_CURR_SINK, &sink_config);
582 if (rc < 0) {
583 dev_err(wled->dev, "Failed to read SINK configuration rc=%d\n",
584 rc);
585 goto failed_detect;
586 }
587
588 /* Disable the module before starting detection */
589 rc = regmap_update_bits(wled->regmap,
590 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
591 WLED3_CTRL_REG_MOD_EN_MASK, 0);
592 if (rc < 0) {
593 dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", rc);
594 goto failed_detect;
595 }
596
597 /* Set low brightness across all sinks */
598 rc = wled4_set_brightness(wled, AUTO_DETECT_BRIGHTNESS);
599 if (rc < 0) {
600 dev_err(wled->dev, "Failed to set brightness for auto detection rc=%d\n",
601 rc);
602 goto failed_detect;
603 }
604
605 if (wled->cfg.cabc) {
606 rc = wled->wled_cabc_config(wled, false);
607 if (rc < 0)
608 goto failed_detect;
609 }
610
611 /* Disable all sinks */
612 rc = regmap_write(wled->regmap,
613 wled->sink_addr + WLED4_SINK_REG_CURR_SINK, 0);
614 if (rc < 0) {
615 dev_err(wled->dev, "Failed to disable all sinks rc=%d\n", rc);
616 goto failed_detect;
617 }
618
619 /* Iterate through the strings one by one */
620 for (i = 0; i < wled->cfg.num_strings; i++) {
621 j = wled->cfg.enabled_strings[i];
622 sink_test = BIT((WLED4_SINK_REG_CURR_SINK_SHFT + j));
623
624 /* Enable feedback control */
625 rc = regmap_write(wled->regmap, wled->ctrl_addr +
626 WLED3_CTRL_REG_FEEDBACK_CONTROL, j + 1);
627 if (rc < 0) {
628 dev_err(wled->dev, "Failed to enable feedback for SINK %d rc = %d\n",
629 j + 1, rc);
630 goto failed_detect;
631 }
632
633 /* Enable the sink */
634 rc = regmap_write(wled->regmap, wled->sink_addr +
635 WLED4_SINK_REG_CURR_SINK, sink_test);
636 if (rc < 0) {
637 dev_err(wled->dev, "Failed to configure SINK %d rc=%d\n",
638 j + 1, rc);
639 goto failed_detect;
640 }
641
642 /* Enable the module */
643 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
644 WLED3_CTRL_REG_MOD_EN,
645 WLED3_CTRL_REG_MOD_EN_MASK,
646 WLED3_CTRL_REG_MOD_EN_MASK);
647 if (rc < 0) {
648 dev_err(wled->dev, "Failed to enable WLED module rc=%d\n",
649 rc);
650 goto failed_detect;
651 }
652
653 delay_time_us = wled->wled_ovp_delay(wled);
654 usleep_range(delay_time_us, delay_time_us + 1000);
655
656 rc = wled_ovp_fault_status(wled, &fault_set);
657 if (rc < 0) {
658 dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
659 rc);
660 goto failed_detect;
661 }
662
663 if (fault_set)
664 dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n",
665 j + 1);
666 else
667 sink_valid |= sink_test;
668
669 /* Disable the module */
670 rc = regmap_update_bits(wled->regmap,
671 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
672 WLED3_CTRL_REG_MOD_EN_MASK, 0);
673 if (rc < 0) {
674 dev_err(wled->dev, "Failed to disable WLED module rc=%d\n",
675 rc);
676 goto failed_detect;
677 }
678 }
679
680 if (!sink_valid) {
681 dev_err(wled->dev, "No valid WLED sinks found\n");
682 wled->disabled_by_short = true;
683 goto failed_detect;
684 }
685
686 if (sink_valid != sink_config) {
687 dev_warn(wled->dev, "%x is not a valid sink configuration - using %x instead\n",
688 sink_config, sink_valid);
689 sink_config = sink_valid;
690 }
691
692 /* Write the new sink configuration */
693 rc = regmap_write(wled->regmap,
694 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
695 sink_config);
696 if (rc < 0) {
697 dev_err(wled->dev, "Failed to reconfigure the default sink rc=%d\n",
698 rc);
699 goto failed_detect;
700 }
701
702 /* Enable valid sinks */
703 if (wled->version == 4) {
704 for (i = 0; i < wled->cfg.num_strings; i++) {
705 j = wled->cfg.enabled_strings[i];
706 if (sink_config &
707 BIT(WLED4_SINK_REG_CURR_SINK_SHFT + j))
708 val = WLED4_SINK_REG_STR_MOD_MASK;
709 else
710 /* Disable modulator_en for unused sink */
711 val = 0;
712
713 rc = regmap_write(wled->regmap, wled->sink_addr +
714 WLED4_SINK_REG_STR_MOD_EN(j), val);
715 if (rc < 0) {
716 dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n",
717 rc);
718 goto failed_detect;
719 }
720 }
721 }
722
723 /* Enable CABC */
724 rc = wled->wled_cabc_config(wled, true);
725 if (rc < 0)
726 goto failed_detect;
727
728 /* Restore the feedback setting */
729 rc = regmap_write(wled->regmap,
730 wled->ctrl_addr + WLED3_CTRL_REG_FEEDBACK_CONTROL, 0);
731 if (rc < 0) {
732 dev_err(wled->dev, "Failed to restore feedback setting rc=%d\n",
733 rc);
734 goto failed_detect;
735 }
736
737 /* Restore brightness */
738 rc = wled4_set_brightness(wled, wled->brightness);
739 if (rc < 0) {
740 dev_err(wled->dev, "Failed to set brightness after auto detection rc=%d\n",
741 rc);
742 goto failed_detect;
743 }
744
745 rc = regmap_update_bits(wled->regmap,
746 wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
747 WLED3_CTRL_REG_MOD_EN_MASK,
748 WLED3_CTRL_REG_MOD_EN_MASK);
749 if (rc < 0) {
750 dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", rc);
751 goto failed_detect;
752 }
753
754 failed_detect:
755 return;
756 }
757
758 #define WLED_AUTO_DETECT_OVP_COUNT 5
759 #define WLED_AUTO_DETECT_CNT_DLY_US USEC_PER_SEC
760
wled4_auto_detection_required(struct wled * wled)761 static bool wled4_auto_detection_required(struct wled *wled)
762 {
763 s64 elapsed_time_us;
764
765 if (!wled->cfg.auto_detection_enabled)
766 return false;
767
768 /*
769 * Check if the OVP fault was an occasional one
770 * or if it's firing continuously, the latter qualifies
771 * for an auto-detection check.
772 */
773 if (!wled->auto_detection_ovp_count) {
774 wled->start_ovp_fault_time = ktime_get();
775 wled->auto_detection_ovp_count++;
776 } else {
777 elapsed_time_us = ktime_us_delta(ktime_get(),
778 wled->start_ovp_fault_time);
779 if (elapsed_time_us > WLED_AUTO_DETECT_CNT_DLY_US)
780 wled->auto_detection_ovp_count = 0;
781 else
782 wled->auto_detection_ovp_count++;
783
784 if (wled->auto_detection_ovp_count >=
785 WLED_AUTO_DETECT_OVP_COUNT) {
786 wled->auto_detection_ovp_count = 0;
787 return true;
788 }
789 }
790
791 return false;
792 }
793
wled5_auto_detection_required(struct wled * wled)794 static bool wled5_auto_detection_required(struct wled *wled)
795 {
796 if (!wled->cfg.auto_detection_enabled)
797 return false;
798
799 /*
800 * Unlike WLED4, WLED5 has OVP fault density interrupt configuration
801 * i.e. to count the number of OVP alarms for a certain duration before
802 * triggering OVP fault interrupt. By default, number of OVP fault
803 * events counted before an interrupt is fired is 32 and the time
804 * interval is 12 ms. If we see one OVP fault interrupt, then that
805 * should qualify for a real OVP fault condition to run auto detection
806 * algorithm.
807 */
808 return true;
809 }
810
wled_auto_detection_at_init(struct wled * wled)811 static int wled_auto_detection_at_init(struct wled *wled)
812 {
813 int rc;
814 bool fault_set;
815
816 if (!wled->cfg.auto_detection_enabled)
817 return 0;
818
819 rc = wled_ovp_fault_status(wled, &fault_set);
820 if (rc < 0) {
821 dev_err(wled->dev, "Error in getting OVP fault_sts, rc=%d\n",
822 rc);
823 return rc;
824 }
825
826 if (fault_set) {
827 mutex_lock(&wled->lock);
828 wled_auto_string_detection(wled);
829 mutex_unlock(&wled->lock);
830 }
831
832 return rc;
833 }
834
wled_ovp_irq_handler(int irq,void * _wled)835 static irqreturn_t wled_ovp_irq_handler(int irq, void *_wled)
836 {
837 struct wled *wled = _wled;
838 int rc;
839 u32 int_sts, fault_sts;
840
841 rc = regmap_read(wled->regmap,
842 wled->ctrl_addr + WLED3_CTRL_REG_INT_RT_STS, &int_sts);
843 if (rc < 0) {
844 dev_err(wled->dev, "Error in reading WLED3_INT_RT_STS rc=%d\n",
845 rc);
846 return IRQ_HANDLED;
847 }
848
849 rc = regmap_read(wled->regmap, wled->ctrl_addr +
850 WLED3_CTRL_REG_FAULT_STATUS, &fault_sts);
851 if (rc < 0) {
852 dev_err(wled->dev, "Error in reading WLED_FAULT_STATUS rc=%d\n",
853 rc);
854 return IRQ_HANDLED;
855 }
856
857 if (fault_sts & (WLED3_CTRL_REG_OVP_FAULT_BIT |
858 WLED3_CTRL_REG_ILIM_FAULT_BIT))
859 dev_dbg(wled->dev, "WLED OVP fault detected, int_sts=%x fault_sts= %x\n",
860 int_sts, fault_sts);
861
862 if (fault_sts & WLED3_CTRL_REG_OVP_FAULT_BIT) {
863 if (wled->wled_auto_detection_required(wled)) {
864 mutex_lock(&wled->lock);
865 wled_auto_string_detection(wled);
866 mutex_unlock(&wled->lock);
867 }
868 }
869
870 return IRQ_HANDLED;
871 }
872
wled3_setup(struct wled * wled)873 static int wled3_setup(struct wled *wled)
874 {
875 u16 addr;
876 u8 sink_en = 0;
877 int rc, i, j;
878
879 rc = regmap_update_bits(wled->regmap,
880 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
881 WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
882 if (rc)
883 return rc;
884
885 rc = regmap_update_bits(wled->regmap,
886 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
887 WLED3_CTRL_REG_ILIMIT_MASK,
888 wled->cfg.boost_i_limit);
889 if (rc)
890 return rc;
891
892 rc = regmap_update_bits(wled->regmap,
893 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
894 WLED3_CTRL_REG_FREQ_MASK,
895 wled->cfg.switch_freq);
896 if (rc)
897 return rc;
898
899 for (i = 0; i < wled->cfg.num_strings; ++i) {
900 j = wled->cfg.enabled_strings[i];
901 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
902 rc = regmap_update_bits(wled->regmap, addr,
903 WLED3_SINK_REG_STR_MOD_MASK,
904 WLED3_SINK_REG_STR_MOD_MASK);
905 if (rc)
906 return rc;
907
908 if (wled->cfg.ext_gen) {
909 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
910 rc = regmap_update_bits(wled->regmap, addr,
911 WLED3_SINK_REG_STR_MOD_SRC_MASK,
912 WLED3_SINK_REG_STR_MOD_SRC_EXT);
913 if (rc)
914 return rc;
915 }
916
917 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
918 rc = regmap_update_bits(wled->regmap, addr,
919 WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
920 wled->cfg.string_i_limit);
921 if (rc)
922 return rc;
923
924 addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
925 rc = regmap_update_bits(wled->regmap, addr,
926 WLED3_SINK_REG_STR_CABC_MASK,
927 wled->cfg.cabc ?
928 WLED3_SINK_REG_STR_CABC_MASK : 0);
929 if (rc)
930 return rc;
931
932 sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
933 }
934
935 rc = regmap_update_bits(wled->regmap,
936 wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
937 WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
938 if (rc)
939 return rc;
940
941 return 0;
942 }
943
944 static const struct wled_config wled3_config_defaults = {
945 .boost_i_limit = 3,
946 .string_i_limit = 20,
947 .ovp = 2,
948 .num_strings = 3,
949 .switch_freq = 5,
950 .cs_out_en = false,
951 .ext_gen = false,
952 .cabc = false,
953 .enabled_strings = {0, 1, 2},
954 };
955
wled4_setup(struct wled * wled)956 static int wled4_setup(struct wled *wled)
957 {
958 int rc, temp, i, j;
959 u16 addr;
960 u8 sink_en = 0;
961 u32 sink_cfg;
962
963 rc = regmap_update_bits(wled->regmap,
964 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
965 WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
966 if (rc < 0)
967 return rc;
968
969 rc = regmap_update_bits(wled->regmap,
970 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
971 WLED3_CTRL_REG_ILIMIT_MASK,
972 wled->cfg.boost_i_limit);
973 if (rc < 0)
974 return rc;
975
976 rc = regmap_update_bits(wled->regmap,
977 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
978 WLED3_CTRL_REG_FREQ_MASK,
979 wled->cfg.switch_freq);
980 if (rc < 0)
981 return rc;
982
983 if (wled->cfg.external_pfet) {
984 /* Unlock the secure register access */
985 rc = regmap_write(wled->regmap, wled->ctrl_addr +
986 WLED4_CTRL_REG_SEC_ACCESS,
987 WLED4_CTRL_REG_SEC_UNLOCK);
988 if (rc < 0)
989 return rc;
990
991 rc = regmap_write(wled->regmap,
992 wled->ctrl_addr + WLED4_CTRL_REG_TEST1,
993 WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2);
994 if (rc < 0)
995 return rc;
996 }
997
998 rc = regmap_read(wled->regmap, wled->sink_addr +
999 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
1000 if (rc < 0)
1001 return rc;
1002
1003 for (i = 0; i < wled->cfg.num_strings; i++) {
1004 j = wled->cfg.enabled_strings[i];
1005 temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
1006 sink_en |= 1 << temp;
1007 }
1008
1009 if (sink_cfg == sink_en) {
1010 rc = wled_auto_detection_at_init(wled);
1011 return rc;
1012 }
1013
1014 rc = regmap_update_bits(wled->regmap,
1015 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1016 WLED4_SINK_REG_CURR_SINK_MASK, 0);
1017 if (rc < 0)
1018 return rc;
1019
1020 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1021 WLED3_CTRL_REG_MOD_EN,
1022 WLED3_CTRL_REG_MOD_EN_MASK, 0);
1023 if (rc < 0)
1024 return rc;
1025
1026 /* Per sink/string configuration */
1027 for (i = 0; i < wled->cfg.num_strings; i++) {
1028 j = wled->cfg.enabled_strings[i];
1029
1030 addr = wled->sink_addr +
1031 WLED4_SINK_REG_STR_MOD_EN(j);
1032 rc = regmap_update_bits(wled->regmap, addr,
1033 WLED4_SINK_REG_STR_MOD_MASK,
1034 WLED4_SINK_REG_STR_MOD_MASK);
1035 if (rc < 0)
1036 return rc;
1037
1038 addr = wled->sink_addr +
1039 WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
1040 rc = regmap_update_bits(wled->regmap, addr,
1041 WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
1042 wled->cfg.string_i_limit);
1043 if (rc < 0)
1044 return rc;
1045 }
1046
1047 rc = wled4_cabc_config(wled, wled->cfg.cabc);
1048 if (rc < 0)
1049 return rc;
1050
1051 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1052 WLED3_CTRL_REG_MOD_EN,
1053 WLED3_CTRL_REG_MOD_EN_MASK,
1054 WLED3_CTRL_REG_MOD_EN_MASK);
1055 if (rc < 0)
1056 return rc;
1057
1058 rc = regmap_update_bits(wled->regmap,
1059 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1060 WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
1061 if (rc < 0)
1062 return rc;
1063
1064 rc = wled->wled_sync_toggle(wled);
1065 if (rc < 0) {
1066 dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
1067 return rc;
1068 }
1069
1070 rc = wled_auto_detection_at_init(wled);
1071
1072 return rc;
1073 }
1074
1075 static const struct wled_config wled4_config_defaults = {
1076 .boost_i_limit = 4,
1077 .string_i_limit = 10,
1078 .ovp = 1,
1079 .num_strings = 4,
1080 .switch_freq = 11,
1081 .cabc = false,
1082 .external_pfet = false,
1083 .auto_detection_enabled = false,
1084 .enabled_strings = {0, 1, 2, 3},
1085 };
1086
wled5_setup(struct wled * wled)1087 static int wled5_setup(struct wled *wled)
1088 {
1089 int rc, temp, i, j, offset;
1090 u8 sink_en = 0;
1091 u16 addr;
1092 u32 val;
1093
1094 rc = regmap_update_bits(wled->regmap,
1095 wled->ctrl_addr + WLED3_CTRL_REG_OVP,
1096 WLED5_CTRL_REG_OVP_MASK, wled->cfg.ovp);
1097 if (rc < 0)
1098 return rc;
1099
1100 rc = regmap_update_bits(wled->regmap,
1101 wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
1102 WLED3_CTRL_REG_ILIMIT_MASK,
1103 wled->cfg.boost_i_limit);
1104 if (rc < 0)
1105 return rc;
1106
1107 rc = regmap_update_bits(wled->regmap,
1108 wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
1109 WLED3_CTRL_REG_FREQ_MASK,
1110 wled->cfg.switch_freq);
1111 if (rc < 0)
1112 return rc;
1113
1114 /* Per sink/string configuration */
1115 for (i = 0; i < wled->cfg.num_strings; ++i) {
1116 j = wled->cfg.enabled_strings[i];
1117 addr = wled->sink_addr +
1118 WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
1119 rc = regmap_update_bits(wled->regmap, addr,
1120 WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
1121 wled->cfg.string_i_limit);
1122 if (rc < 0)
1123 return rc;
1124
1125 addr = wled->sink_addr + WLED5_SINK_REG_STR_SRC_SEL(j);
1126 rc = regmap_update_bits(wled->regmap, addr,
1127 WLED5_SINK_REG_SRC_SEL_MASK,
1128 wled->cfg.mod_sel == MOD_A ?
1129 WLED5_SINK_REG_SRC_SEL_MOD_A :
1130 WLED5_SINK_REG_SRC_SEL_MOD_B);
1131
1132 temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
1133 sink_en |= 1 << temp;
1134 }
1135
1136 rc = wled5_cabc_config(wled, wled->cfg.cabc_sel ? true : false);
1137 if (rc < 0)
1138 return rc;
1139
1140 /* Enable one of the modulators A or B based on mod_sel */
1141 addr = wled->sink_addr + WLED5_SINK_REG_MOD_A_EN;
1142 val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
1143 rc = regmap_update_bits(wled->regmap, addr,
1144 WLED5_SINK_REG_MOD_EN_MASK, val);
1145 if (rc < 0)
1146 return rc;
1147
1148 addr = wled->sink_addr + WLED5_SINK_REG_MOD_B_EN;
1149 val = (wled->cfg.mod_sel == MOD_B) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
1150 rc = regmap_update_bits(wled->regmap, addr,
1151 WLED5_SINK_REG_MOD_EN_MASK, val);
1152 if (rc < 0)
1153 return rc;
1154
1155 offset = (wled->cfg.mod_sel == MOD_A) ?
1156 WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL :
1157 WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL;
1158
1159 addr = wled->sink_addr + offset;
1160 val = (wled->max_brightness == WLED5_SINK_REG_BRIGHT_MAX_15B) ?
1161 WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B :
1162 WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B;
1163 rc = regmap_write(wled->regmap, addr, val);
1164 if (rc < 0)
1165 return rc;
1166
1167 rc = regmap_update_bits(wled->regmap,
1168 wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
1169 WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
1170 if (rc < 0)
1171 return rc;
1172
1173 /* This updates only FSC configuration in WLED5 */
1174 rc = wled->wled_sync_toggle(wled);
1175 if (rc < 0) {
1176 pr_err("Failed to toggle sync reg rc:%d\n", rc);
1177 return rc;
1178 }
1179
1180 rc = wled_auto_detection_at_init(wled);
1181 if (rc < 0)
1182 return rc;
1183
1184 return 0;
1185 }
1186
1187 static const struct wled_config wled5_config_defaults = {
1188 .boost_i_limit = 5,
1189 .string_i_limit = 10,
1190 .ovp = 4,
1191 .num_strings = 4,
1192 .switch_freq = 11,
1193 .mod_sel = 0,
1194 .cabc_sel = 0,
1195 .cabc = false,
1196 .external_pfet = false,
1197 .auto_detection_enabled = false,
1198 .enabled_strings = {0, 1, 2, 3},
1199 };
1200
1201 static const u32 wled3_boost_i_limit_values[] = {
1202 105, 385, 525, 805, 980, 1260, 1400, 1680,
1203 };
1204
1205 static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
1206 .values = wled3_boost_i_limit_values,
1207 .size = ARRAY_SIZE(wled3_boost_i_limit_values),
1208 };
1209
1210 static const u32 wled4_boost_i_limit_values[] = {
1211 105, 280, 450, 620, 970, 1150, 1300, 1500,
1212 };
1213
1214 static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
1215 .values = wled4_boost_i_limit_values,
1216 .size = ARRAY_SIZE(wled4_boost_i_limit_values),
1217 };
1218
wled5_boost_i_limit_values_fn(u32 idx)1219 static inline u32 wled5_boost_i_limit_values_fn(u32 idx)
1220 {
1221 return 525 + (idx * 175);
1222 }
1223
1224 static const struct wled_var_cfg wled5_boost_i_limit_cfg = {
1225 .fn = wled5_boost_i_limit_values_fn,
1226 .size = 8,
1227 };
1228
1229 static const u32 wled3_ovp_values[] = {
1230 35, 32, 29, 27,
1231 };
1232
1233 static const struct wled_var_cfg wled3_ovp_cfg = {
1234 .values = wled3_ovp_values,
1235 .size = ARRAY_SIZE(wled3_ovp_values),
1236 };
1237
1238 static const u32 wled4_ovp_values[] = {
1239 31100, 29600, 19600, 18100,
1240 };
1241
1242 static const struct wled_var_cfg wled4_ovp_cfg = {
1243 .values = wled4_ovp_values,
1244 .size = ARRAY_SIZE(wled4_ovp_values),
1245 };
1246
wled5_ovp_values_fn(u32 idx)1247 static inline u32 wled5_ovp_values_fn(u32 idx)
1248 {
1249 /*
1250 * 0000 - 38.5 V
1251 * 0001 - 37 V ..
1252 * 1111 - 16 V
1253 */
1254 return 38500 - (idx * 1500);
1255 }
1256
1257 static const struct wled_var_cfg wled5_ovp_cfg = {
1258 .fn = wled5_ovp_values_fn,
1259 .size = 16,
1260 };
1261
wled3_switch_freq_values_fn(u32 idx)1262 static u32 wled3_switch_freq_values_fn(u32 idx)
1263 {
1264 return 19200 / (2 * (1 + idx));
1265 }
1266
1267 static const struct wled_var_cfg wled3_switch_freq_cfg = {
1268 .fn = wled3_switch_freq_values_fn,
1269 .size = 16,
1270 };
1271
1272 static const struct wled_var_cfg wled3_string_i_limit_cfg = {
1273 .size = 26,
1274 };
1275
1276 static const u32 wled4_string_i_limit_values[] = {
1277 0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
1278 22500, 25000, 27500, 30000,
1279 };
1280
1281 static const struct wled_var_cfg wled4_string_i_limit_cfg = {
1282 .values = wled4_string_i_limit_values,
1283 .size = ARRAY_SIZE(wled4_string_i_limit_values),
1284 };
1285
1286 static const struct wled_var_cfg wled5_mod_sel_cfg = {
1287 .size = 2,
1288 };
1289
1290 static const struct wled_var_cfg wled5_cabc_sel_cfg = {
1291 .size = 4,
1292 };
1293
wled_values(const struct wled_var_cfg * cfg,u32 idx)1294 static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
1295 {
1296 if (idx >= cfg->size)
1297 return UINT_MAX;
1298 if (cfg->fn)
1299 return cfg->fn(idx);
1300 if (cfg->values)
1301 return cfg->values[idx];
1302 return idx;
1303 }
1304
wled_configure(struct wled * wled)1305 static int wled_configure(struct wled *wled)
1306 {
1307 struct wled_config *cfg = &wled->cfg;
1308 struct device *dev = wled->dev;
1309 const __be32 *prop_addr;
1310 u32 size, val, c;
1311 int rc, i, j, string_len;
1312
1313 const struct wled_u32_opts *u32_opts = NULL;
1314 const struct wled_u32_opts wled3_opts[] = {
1315 {
1316 .name = "qcom,current-boost-limit",
1317 .val_ptr = &cfg->boost_i_limit,
1318 .cfg = &wled3_boost_i_limit_cfg,
1319 },
1320 {
1321 .name = "qcom,current-limit",
1322 .val_ptr = &cfg->string_i_limit,
1323 .cfg = &wled3_string_i_limit_cfg,
1324 },
1325 {
1326 .name = "qcom,ovp",
1327 .val_ptr = &cfg->ovp,
1328 .cfg = &wled3_ovp_cfg,
1329 },
1330 {
1331 .name = "qcom,switching-freq",
1332 .val_ptr = &cfg->switch_freq,
1333 .cfg = &wled3_switch_freq_cfg,
1334 },
1335 };
1336
1337 const struct wled_u32_opts wled4_opts[] = {
1338 {
1339 .name = "qcom,current-boost-limit",
1340 .val_ptr = &cfg->boost_i_limit,
1341 .cfg = &wled4_boost_i_limit_cfg,
1342 },
1343 {
1344 .name = "qcom,current-limit-microamp",
1345 .val_ptr = &cfg->string_i_limit,
1346 .cfg = &wled4_string_i_limit_cfg,
1347 },
1348 {
1349 .name = "qcom,ovp-millivolt",
1350 .val_ptr = &cfg->ovp,
1351 .cfg = &wled4_ovp_cfg,
1352 },
1353 {
1354 .name = "qcom,switching-freq",
1355 .val_ptr = &cfg->switch_freq,
1356 .cfg = &wled3_switch_freq_cfg,
1357 },
1358 };
1359
1360 const struct wled_u32_opts wled5_opts[] = {
1361 {
1362 .name = "qcom,current-boost-limit",
1363 .val_ptr = &cfg->boost_i_limit,
1364 .cfg = &wled5_boost_i_limit_cfg,
1365 },
1366 {
1367 .name = "qcom,current-limit-microamp",
1368 .val_ptr = &cfg->string_i_limit,
1369 .cfg = &wled4_string_i_limit_cfg,
1370 },
1371 {
1372 .name = "qcom,ovp-millivolt",
1373 .val_ptr = &cfg->ovp,
1374 .cfg = &wled5_ovp_cfg,
1375 },
1376 {
1377 .name = "qcom,switching-freq",
1378 .val_ptr = &cfg->switch_freq,
1379 .cfg = &wled3_switch_freq_cfg,
1380 },
1381 {
1382 .name = "qcom,modulator-sel",
1383 .val_ptr = &cfg->mod_sel,
1384 .cfg = &wled5_mod_sel_cfg,
1385 },
1386 {
1387 .name = "qcom,cabc-sel",
1388 .val_ptr = &cfg->cabc_sel,
1389 .cfg = &wled5_cabc_sel_cfg,
1390 },
1391 };
1392
1393 const struct wled_bool_opts bool_opts[] = {
1394 { "qcom,cs-out", &cfg->cs_out_en, },
1395 { "qcom,ext-gen", &cfg->ext_gen, },
1396 { "qcom,cabc", &cfg->cabc, },
1397 { "qcom,external-pfet", &cfg->external_pfet, },
1398 { "qcom,auto-string-detection", &cfg->auto_detection_enabled, },
1399 };
1400
1401 prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
1402 if (!prop_addr) {
1403 dev_err(wled->dev, "invalid IO resources\n");
1404 return -EINVAL;
1405 }
1406 wled->ctrl_addr = be32_to_cpu(*prop_addr);
1407
1408 rc = of_property_read_string(dev->of_node, "label", &wled->name);
1409 if (rc)
1410 wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
1411
1412 switch (wled->version) {
1413 case 3:
1414 u32_opts = wled3_opts;
1415 size = ARRAY_SIZE(wled3_opts);
1416 *cfg = wled3_config_defaults;
1417 wled->wled_set_brightness = wled3_set_brightness;
1418 wled->wled_sync_toggle = wled3_sync_toggle;
1419 wled->max_string_count = 3;
1420 wled->sink_addr = wled->ctrl_addr;
1421 break;
1422
1423 case 4:
1424 u32_opts = wled4_opts;
1425 size = ARRAY_SIZE(wled4_opts);
1426 *cfg = wled4_config_defaults;
1427 wled->wled_set_brightness = wled4_set_brightness;
1428 wled->wled_sync_toggle = wled3_sync_toggle;
1429 wled->wled_cabc_config = wled4_cabc_config;
1430 wled->wled_ovp_delay = wled4_ovp_delay;
1431 wled->wled_auto_detection_required =
1432 wled4_auto_detection_required;
1433 wled->max_string_count = 4;
1434
1435 prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
1436 if (!prop_addr) {
1437 dev_err(wled->dev, "invalid IO resources\n");
1438 return -EINVAL;
1439 }
1440 wled->sink_addr = be32_to_cpu(*prop_addr);
1441 break;
1442
1443 case 5:
1444 u32_opts = wled5_opts;
1445 size = ARRAY_SIZE(wled5_opts);
1446 *cfg = wled5_config_defaults;
1447 wled->wled_set_brightness = wled5_set_brightness;
1448 wled->wled_sync_toggle = wled3_sync_toggle;
1449 wled->wled_cabc_config = wled5_cabc_config;
1450 wled->wled_ovp_delay = wled5_ovp_delay;
1451 wled->wled_auto_detection_required =
1452 wled5_auto_detection_required;
1453 wled->max_string_count = 4;
1454
1455 prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
1456 if (!prop_addr) {
1457 dev_err(wled->dev, "invalid IO resources\n");
1458 return -EINVAL;
1459 }
1460 wled->sink_addr = be32_to_cpu(*prop_addr);
1461 break;
1462
1463 default:
1464 dev_err(wled->dev, "Invalid WLED version\n");
1465 return -EINVAL;
1466 }
1467
1468 for (i = 0; i < size; ++i) {
1469 rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
1470 if (rc == -EINVAL) {
1471 continue;
1472 } else if (rc) {
1473 dev_err(dev, "error reading '%s'\n", u32_opts[i].name);
1474 return rc;
1475 }
1476
1477 c = UINT_MAX;
1478 for (j = 0; c != val; j++) {
1479 c = wled_values(u32_opts[i].cfg, j);
1480 if (c == UINT_MAX) {
1481 dev_err(dev, "invalid value for '%s'\n",
1482 u32_opts[i].name);
1483 return -EINVAL;
1484 }
1485
1486 if (c == val)
1487 break;
1488 }
1489
1490 dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
1491 *u32_opts[i].val_ptr = j;
1492 }
1493
1494 for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) {
1495 if (of_property_read_bool(dev->of_node, bool_opts[i].name))
1496 *bool_opts[i].val_ptr = true;
1497 }
1498
1499 string_len = of_property_count_elems_of_size(dev->of_node,
1500 "qcom,enabled-strings",
1501 sizeof(u32));
1502 if (string_len > 0) {
1503 if (string_len > wled->max_string_count) {
1504 dev_err(dev, "Cannot have more than %d strings\n",
1505 wled->max_string_count);
1506 return -EINVAL;
1507 }
1508
1509 rc = of_property_read_u32_array(dev->of_node,
1510 "qcom,enabled-strings",
1511 wled->cfg.enabled_strings,
1512 string_len);
1513 if (rc) {
1514 dev_err(dev, "Failed to read %d elements from qcom,enabled-strings: %d\n",
1515 string_len, rc);
1516 return rc;
1517 }
1518
1519 for (i = 0; i < string_len; ++i) {
1520 if (wled->cfg.enabled_strings[i] >= wled->max_string_count) {
1521 dev_err(dev,
1522 "qcom,enabled-strings index %d at %d is out of bounds\n",
1523 wled->cfg.enabled_strings[i], i);
1524 return -EINVAL;
1525 }
1526 }
1527
1528 cfg->num_strings = string_len;
1529 }
1530
1531 rc = of_property_read_u32(dev->of_node, "qcom,num-strings", &val);
1532 if (!rc) {
1533 if (val < 1 || val > wled->max_string_count) {
1534 dev_err(dev, "qcom,num-strings must be between 1 and %d\n",
1535 wled->max_string_count);
1536 return -EINVAL;
1537 }
1538
1539 if (string_len > 0) {
1540 dev_warn(dev, "Only one of qcom,num-strings or qcom,enabled-strings"
1541 " should be set\n");
1542 if (val > string_len) {
1543 dev_err(dev, "qcom,num-strings exceeds qcom,enabled-strings\n");
1544 return -EINVAL;
1545 }
1546 }
1547
1548 cfg->num_strings = val;
1549 }
1550
1551 return 0;
1552 }
1553
wled_configure_short_irq(struct wled * wled,struct platform_device * pdev)1554 static int wled_configure_short_irq(struct wled *wled,
1555 struct platform_device *pdev)
1556 {
1557 int rc;
1558
1559 if (!wled->has_short_detect)
1560 return 0;
1561
1562 rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
1563 WLED4_CTRL_REG_SHORT_PROTECT,
1564 WLED4_CTRL_REG_SHORT_EN_MASK,
1565 WLED4_CTRL_REG_SHORT_EN_MASK);
1566 if (rc < 0)
1567 return rc;
1568
1569 wled->short_irq = platform_get_irq_byname(pdev, "short");
1570 if (wled->short_irq < 0) {
1571 dev_dbg(&pdev->dev, "short irq is not used\n");
1572 return 0;
1573 }
1574
1575 rc = devm_request_threaded_irq(wled->dev, wled->short_irq,
1576 NULL, wled_short_irq_handler,
1577 IRQF_ONESHOT,
1578 "wled_short_irq", wled);
1579 if (rc < 0)
1580 dev_err(wled->dev, "Unable to request short_irq (err:%d)\n",
1581 rc);
1582
1583 return rc;
1584 }
1585
wled_configure_ovp_irq(struct wled * wled,struct platform_device * pdev)1586 static int wled_configure_ovp_irq(struct wled *wled,
1587 struct platform_device *pdev)
1588 {
1589 int rc;
1590 u32 val;
1591
1592 wled->ovp_irq = platform_get_irq_byname(pdev, "ovp");
1593 if (wled->ovp_irq < 0) {
1594 dev_dbg(&pdev->dev, "OVP IRQ not found - disabling automatic string detection\n");
1595 return 0;
1596 }
1597
1598 rc = devm_request_threaded_irq(wled->dev, wled->ovp_irq, NULL,
1599 wled_ovp_irq_handler, IRQF_ONESHOT,
1600 "wled_ovp_irq", wled);
1601 if (rc < 0) {
1602 dev_err(wled->dev, "Unable to request ovp_irq (err:%d)\n",
1603 rc);
1604 wled->ovp_irq = 0;
1605 return 0;
1606 }
1607
1608 rc = regmap_read(wled->regmap, wled->ctrl_addr +
1609 WLED3_CTRL_REG_MOD_EN, &val);
1610 if (rc < 0)
1611 return rc;
1612
1613 /* Keep OVP irq disabled until module is enabled */
1614 if (!(val & WLED3_CTRL_REG_MOD_EN_MASK))
1615 disable_irq(wled->ovp_irq);
1616
1617 return 0;
1618 }
1619
1620 static const struct backlight_ops wled_ops = {
1621 .update_status = wled_update_status,
1622 };
1623
wled_probe(struct platform_device * pdev)1624 static int wled_probe(struct platform_device *pdev)
1625 {
1626 struct backlight_properties props;
1627 struct backlight_device *bl;
1628 struct wled *wled;
1629 struct regmap *regmap;
1630 u32 val;
1631 int rc;
1632
1633 regmap = dev_get_regmap(pdev->dev.parent, NULL);
1634 if (!regmap) {
1635 dev_err(&pdev->dev, "Unable to get regmap\n");
1636 return -EINVAL;
1637 }
1638
1639 wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL);
1640 if (!wled)
1641 return -ENOMEM;
1642
1643 wled->regmap = regmap;
1644 wled->dev = &pdev->dev;
1645
1646 wled->version = (uintptr_t)of_device_get_match_data(&pdev->dev);
1647 if (!wled->version) {
1648 dev_err(&pdev->dev, "Unknown device version\n");
1649 return -ENODEV;
1650 }
1651
1652 mutex_init(&wled->lock);
1653 rc = wled_configure(wled);
1654 if (rc)
1655 return rc;
1656
1657 val = WLED3_SINK_REG_BRIGHT_MAX;
1658 of_property_read_u32(pdev->dev.of_node, "max-brightness", &val);
1659 wled->max_brightness = val;
1660
1661 switch (wled->version) {
1662 case 3:
1663 wled->cfg.auto_detection_enabled = false;
1664 rc = wled3_setup(wled);
1665 if (rc) {
1666 dev_err(&pdev->dev, "wled3_setup failed\n");
1667 return rc;
1668 }
1669 break;
1670
1671 case 4:
1672 wled->has_short_detect = true;
1673 rc = wled4_setup(wled);
1674 if (rc) {
1675 dev_err(&pdev->dev, "wled4_setup failed\n");
1676 return rc;
1677 }
1678 break;
1679
1680 case 5:
1681 wled->has_short_detect = true;
1682 if (wled->cfg.cabc_sel)
1683 wled->max_brightness = WLED5_SINK_REG_BRIGHT_MAX_12B;
1684
1685 rc = wled5_setup(wled);
1686 if (rc) {
1687 dev_err(&pdev->dev, "wled5_setup failed\n");
1688 return rc;
1689 }
1690 break;
1691
1692 default:
1693 dev_err(wled->dev, "Invalid WLED version\n");
1694 break;
1695 }
1696
1697 INIT_DELAYED_WORK(&wled->ovp_work, wled_ovp_work);
1698
1699 rc = wled_configure_short_irq(wled, pdev);
1700 if (rc < 0)
1701 return rc;
1702
1703 rc = wled_configure_ovp_irq(wled, pdev);
1704 if (rc < 0)
1705 return rc;
1706
1707 val = WLED_DEFAULT_BRIGHTNESS;
1708 of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
1709
1710 memset(&props, 0, sizeof(struct backlight_properties));
1711 props.type = BACKLIGHT_RAW;
1712 props.brightness = val;
1713 props.max_brightness = wled->max_brightness;
1714 bl = devm_backlight_device_register(&pdev->dev, wled->name,
1715 &pdev->dev, wled,
1716 &wled_ops, &props);
1717 return PTR_ERR_OR_ZERO(bl);
1718 };
1719
wled_remove(struct platform_device * pdev)1720 static void wled_remove(struct platform_device *pdev)
1721 {
1722 struct wled *wled = platform_get_drvdata(pdev);
1723
1724 mutex_destroy(&wled->lock);
1725 cancel_delayed_work_sync(&wled->ovp_work);
1726 disable_irq(wled->short_irq);
1727 disable_irq(wled->ovp_irq);
1728 }
1729
1730 static const struct of_device_id wled_match_table[] = {
1731 { .compatible = "qcom,pm8941-wled", .data = (void *)3 },
1732 { .compatible = "qcom,pmi8950-wled", .data = (void *)4 },
1733 { .compatible = "qcom,pmi8994-wled", .data = (void *)4 },
1734 { .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
1735 { .compatible = "qcom,pm660l-wled", .data = (void *)4 },
1736 { .compatible = "qcom,pm6150l-wled", .data = (void *)5 },
1737 { .compatible = "qcom,pm8150l-wled", .data = (void *)5 },
1738 {}
1739 };
1740 MODULE_DEVICE_TABLE(of, wled_match_table);
1741
1742 static struct platform_driver wled_driver = {
1743 .probe = wled_probe,
1744 .remove = wled_remove,
1745 .driver = {
1746 .name = "qcom,wled",
1747 .of_match_table = wled_match_table,
1748 },
1749 };
1750
1751 module_platform_driver(wled_driver);
1752
1753 MODULE_DESCRIPTION("Qualcomm WLED driver");
1754 MODULE_LICENSE("GPL v2");
1755