Merge tag 'for-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power...
[platform/kernel/linux-starfive.git] / drivers / leds / leds-lp5521.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * LP5521 LED chip driver.
4  *
5  * Copyright (C) 2010 Nokia Corporation
6  * Copyright (C) 2012 Texas Instruments
7  *
8  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
9  *          Milo(Woogyom) Kim <milo.kim@ti.com>
10  */
11
12 #include <linux/delay.h>
13 #include <linux/firmware.h>
14 #include <linux/i2c.h>
15 #include <linux/leds.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/platform_data/leds-lp55xx.h>
19 #include <linux/slab.h>
20 #include <linux/of.h>
21
22 #include "leds-lp55xx-common.h"
23
24 #define LP5521_PROGRAM_LENGTH           32
25 #define LP5521_MAX_LEDS                 3
26 #define LP5521_CMD_DIRECT               0x3F
27
28 /* Registers */
29 #define LP5521_REG_ENABLE               0x00
30 #define LP5521_REG_OP_MODE              0x01
31 #define LP5521_REG_R_PWM                0x02
32 #define LP5521_REG_G_PWM                0x03
33 #define LP5521_REG_B_PWM                0x04
34 #define LP5521_REG_R_CURRENT            0x05
35 #define LP5521_REG_G_CURRENT            0x06
36 #define LP5521_REG_B_CURRENT            0x07
37 #define LP5521_REG_CONFIG               0x08
38 #define LP5521_REG_STATUS               0x0C
39 #define LP5521_REG_RESET                0x0D
40 #define LP5521_REG_R_PROG_MEM           0x10
41 #define LP5521_REG_G_PROG_MEM           0x30
42 #define LP5521_REG_B_PROG_MEM           0x50
43
44 /* Base register to set LED current */
45 #define LP5521_REG_LED_CURRENT_BASE     LP5521_REG_R_CURRENT
46 /* Base register to set the brightness */
47 #define LP5521_REG_LED_PWM_BASE         LP5521_REG_R_PWM
48
49 /* Bits in ENABLE register */
50 #define LP5521_MASTER_ENABLE            0x40    /* Chip master enable */
51 #define LP5521_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
52 #define LP5521_EXEC_RUN                 0x2A
53 #define LP5521_ENABLE_DEFAULT   \
54         (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
55 #define LP5521_ENABLE_RUN_PROGRAM       \
56         (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
57
58 /* CONFIG register */
59 #define LP5521_PWM_HF                   0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */
60 #define LP5521_PWRSAVE_EN               0x20    /* 1 = Power save mode */
61 #define LP5521_CP_MODE_MASK             0x18    /* Charge pump mode */
62 #define LP5521_CP_MODE_SHIFT            3
63 #define LP5521_R_TO_BATT                0x04    /* R out: 0 = CP, 1 = Vbat */
64 #define LP5521_CLK_INT                  0x01    /* Internal clock */
65 #define LP5521_DEFAULT_CFG              (LP5521_PWM_HF | LP5521_PWRSAVE_EN)
66
67 /* Status */
68 #define LP5521_EXT_CLK_USED             0x08
69
70 /* default R channel current register value */
71 #define LP5521_REG_R_CURR_DEFAULT       0xAF
72
73 /* Reset register value */
74 #define LP5521_RESET                    0xFF
75
76 /* Program Memory Operations */
77 #define LP5521_MODE_R_M                 0x30    /* Operation Mode Register */
78 #define LP5521_MODE_G_M                 0x0C
79 #define LP5521_MODE_B_M                 0x03
80 #define LP5521_LOAD_R                   0x10
81 #define LP5521_LOAD_G                   0x04
82 #define LP5521_LOAD_B                   0x01
83
84 #define LP5521_R_IS_LOADING(mode)       \
85         ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
86 #define LP5521_G_IS_LOADING(mode)       \
87         ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
88 #define LP5521_B_IS_LOADING(mode)       \
89         ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
90
91 #define LP5521_EXEC_R_M                 0x30    /* Enable Register */
92 #define LP5521_EXEC_G_M                 0x0C
93 #define LP5521_EXEC_B_M                 0x03
94 #define LP5521_EXEC_M                   0x3F
95 #define LP5521_RUN_R                    0x20
96 #define LP5521_RUN_G                    0x08
97 #define LP5521_RUN_B                    0x02
98
99 static inline void lp5521_wait_opmode_done(void)
100 {
101         /* operation mode change needs to be longer than 153 us */
102         usleep_range(200, 300);
103 }
104
105 static inline void lp5521_wait_enable_done(void)
106 {
107         /* it takes more 488 us to update ENABLE register */
108         usleep_range(500, 600);
109 }
110
111 static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
112 {
113         led->led_current = led_current;
114         lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
115                 led_current);
116 }
117
118 static void lp5521_load_engine(struct lp55xx_chip *chip)
119 {
120         enum lp55xx_engine_index idx = chip->engine_idx;
121         static const u8 mask[] = {
122                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
123                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
124                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
125         };
126
127         static const u8 val[] = {
128                 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
129                 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
130                 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
131         };
132
133         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
134
135         lp5521_wait_opmode_done();
136 }
137
138 static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
139 {
140         lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
141         lp5521_wait_opmode_done();
142 }
143
144 static void lp5521_stop_engine(struct lp55xx_chip *chip)
145 {
146         enum lp55xx_engine_index idx = chip->engine_idx;
147         static const u8 mask[] = {
148                 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
149                 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
150                 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
151         };
152
153         lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
154
155         lp5521_wait_opmode_done();
156 }
157
158 static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
159 {
160         int ret;
161         u8 mode;
162         u8 exec;
163
164         /* stop engine */
165         if (!start) {
166                 lp5521_stop_engine(chip);
167                 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
168                 lp5521_wait_opmode_done();
169                 return;
170         }
171
172         /*
173          * To run the engine,
174          * operation mode and enable register should updated at the same time
175          */
176
177         ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
178         if (ret)
179                 return;
180
181         ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
182         if (ret)
183                 return;
184
185         /* change operation mode to RUN only when each engine is loading */
186         if (LP5521_R_IS_LOADING(mode)) {
187                 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
188                 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
189         }
190
191         if (LP5521_G_IS_LOADING(mode)) {
192                 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
193                 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
194         }
195
196         if (LP5521_B_IS_LOADING(mode)) {
197                 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
198                 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
199         }
200
201         lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
202         lp5521_wait_opmode_done();
203
204         lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
205         lp5521_wait_enable_done();
206 }
207
208 static int lp5521_update_program_memory(struct lp55xx_chip *chip,
209                                         const u8 *data, size_t size)
210 {
211         enum lp55xx_engine_index idx = chip->engine_idx;
212         u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
213         static const u8 addr[] = {
214                 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
215                 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
216                 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
217         };
218         unsigned cmd;
219         char c[3];
220         int nrchars;
221         int ret;
222         int offset = 0;
223         int i = 0;
224
225         while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
226                 /* separate sscanfs because length is working only for %s */
227                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
228                 if (ret != 1)
229                         goto err;
230
231                 ret = sscanf(c, "%2x", &cmd);
232                 if (ret != 1)
233                         goto err;
234
235                 pattern[i] = (u8)cmd;
236                 offset += nrchars;
237                 i++;
238         }
239
240         /* Each instruction is 16bit long. Check that length is even */
241         if (i % 2)
242                 goto err;
243
244         for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
245                 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
246                 if (ret)
247                         return -EINVAL;
248         }
249
250         return size;
251
252 err:
253         dev_err(&chip->cl->dev, "wrong pattern format\n");
254         return -EINVAL;
255 }
256
257 static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
258 {
259         const struct firmware *fw = chip->fw;
260
261         if (fw->size > LP5521_PROGRAM_LENGTH) {
262                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
263                         fw->size);
264                 return;
265         }
266
267         /*
268          * Program memory sequence
269          *  1) set engine mode to "LOAD"
270          *  2) write firmware data into program memory
271          */
272
273         lp5521_load_engine(chip);
274         lp5521_update_program_memory(chip, fw->data, fw->size);
275 }
276
277 static int lp5521_post_init_device(struct lp55xx_chip *chip)
278 {
279         int ret;
280         u8 val;
281
282         /*
283          * Make sure that the chip is reset by reading back the r channel
284          * current reg. This is dummy read is required on some platforms -
285          * otherwise further access to the R G B channels in the
286          * LP5521_REG_ENABLE register will not have any effect - strange!
287          */
288         ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
289         if (ret) {
290                 dev_err(&chip->cl->dev, "error in resetting chip\n");
291                 return ret;
292         }
293         if (val != LP5521_REG_R_CURR_DEFAULT) {
294                 dev_err(&chip->cl->dev,
295                         "unexpected data in register (expected 0x%x got 0x%x)\n",
296                         LP5521_REG_R_CURR_DEFAULT, val);
297                 ret = -EINVAL;
298                 return ret;
299         }
300         usleep_range(10000, 20000);
301
302         /* Set all PWMs to direct control mode */
303         ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
304
305         /* Update configuration for the clock setting */
306         val = LP5521_DEFAULT_CFG;
307         if (!lp55xx_is_extclk_used(chip))
308                 val |= LP5521_CLK_INT;
309
310         val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK;
311
312         ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
313         if (ret)
314                 return ret;
315
316         /* Initialize all channels PWM to zero -> leds off */
317         lp55xx_write(chip, LP5521_REG_R_PWM, 0);
318         lp55xx_write(chip, LP5521_REG_G_PWM, 0);
319         lp55xx_write(chip, LP5521_REG_B_PWM, 0);
320
321         /* Set engines are set to run state when OP_MODE enables engines */
322         ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
323         if (ret)
324                 return ret;
325
326         lp5521_wait_enable_done();
327
328         return 0;
329 }
330
331 static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
332 {
333         struct lp55xx_platform_data *pdata = chip->pdata;
334         int ret;
335         u8 status;
336
337         ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
338         if (ret < 0)
339                 return ret;
340
341         if (pdata->clock_mode != LP55XX_CLOCK_EXT)
342                 return 0;
343
344         /* Check that ext clock is really in use if requested */
345         if  ((status & LP5521_EXT_CLK_USED) == 0)
346                 return -EIO;
347
348         return 0;
349 }
350
351 static int lp5521_multicolor_brightness(struct lp55xx_led *led)
352 {
353         struct lp55xx_chip *chip = led->chip;
354         int ret;
355         int i;
356
357         mutex_lock(&chip->lock);
358         for (i = 0; i < led->mc_cdev.num_colors; i++) {
359                 ret = lp55xx_write(chip,
360                                    LP5521_REG_LED_PWM_BASE +
361                                    led->mc_cdev.subled_info[i].channel,
362                                    led->mc_cdev.subled_info[i].brightness);
363                 if (ret)
364                         break;
365         }
366         mutex_unlock(&chip->lock);
367         return ret;
368 }
369
370 static int lp5521_led_brightness(struct lp55xx_led *led)
371 {
372         struct lp55xx_chip *chip = led->chip;
373         int ret;
374
375         mutex_lock(&chip->lock);
376         ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
377                 led->brightness);
378         mutex_unlock(&chip->lock);
379
380         return ret;
381 }
382
383 static ssize_t show_engine_mode(struct device *dev,
384                                 struct device_attribute *attr,
385                                 char *buf, int nr)
386 {
387         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
388         struct lp55xx_chip *chip = led->chip;
389         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
390
391         switch (mode) {
392         case LP55XX_ENGINE_RUN:
393                 return sprintf(buf, "run\n");
394         case LP55XX_ENGINE_LOAD:
395                 return sprintf(buf, "load\n");
396         case LP55XX_ENGINE_DISABLED:
397         default:
398                 return sprintf(buf, "disabled\n");
399         }
400 }
401 show_mode(1)
402 show_mode(2)
403 show_mode(3)
404
405 static ssize_t store_engine_mode(struct device *dev,
406                                  struct device_attribute *attr,
407                                  const char *buf, size_t len, int nr)
408 {
409         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
410         struct lp55xx_chip *chip = led->chip;
411         struct lp55xx_engine *engine = &chip->engines[nr - 1];
412
413         mutex_lock(&chip->lock);
414
415         chip->engine_idx = nr;
416
417         if (!strncmp(buf, "run", 3)) {
418                 lp5521_run_engine(chip, true);
419                 engine->mode = LP55XX_ENGINE_RUN;
420         } else if (!strncmp(buf, "load", 4)) {
421                 lp5521_stop_engine(chip);
422                 lp5521_load_engine(chip);
423                 engine->mode = LP55XX_ENGINE_LOAD;
424         } else if (!strncmp(buf, "disabled", 8)) {
425                 lp5521_stop_engine(chip);
426                 engine->mode = LP55XX_ENGINE_DISABLED;
427         }
428
429         mutex_unlock(&chip->lock);
430
431         return len;
432 }
433 store_mode(1)
434 store_mode(2)
435 store_mode(3)
436
437 static ssize_t store_engine_load(struct device *dev,
438                              struct device_attribute *attr,
439                              const char *buf, size_t len, int nr)
440 {
441         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
442         struct lp55xx_chip *chip = led->chip;
443         int ret;
444
445         mutex_lock(&chip->lock);
446
447         chip->engine_idx = nr;
448         lp5521_load_engine(chip);
449         ret = lp5521_update_program_memory(chip, buf, len);
450
451         mutex_unlock(&chip->lock);
452
453         return ret;
454 }
455 store_load(1)
456 store_load(2)
457 store_load(3)
458
459 static ssize_t lp5521_selftest(struct device *dev,
460                                struct device_attribute *attr,
461                                char *buf)
462 {
463         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
464         struct lp55xx_chip *chip = led->chip;
465         int ret;
466
467         mutex_lock(&chip->lock);
468         ret = lp5521_run_selftest(chip, buf);
469         mutex_unlock(&chip->lock);
470
471         return sysfs_emit(buf, "%s\n", ret ? "FAIL" : "OK");
472 }
473
474 /* device attributes */
475 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
476 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
477 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
478 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
479 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
480 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
481 static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
482
483 static struct attribute *lp5521_attributes[] = {
484         &dev_attr_engine1_mode.attr,
485         &dev_attr_engine2_mode.attr,
486         &dev_attr_engine3_mode.attr,
487         &dev_attr_engine1_load.attr,
488         &dev_attr_engine2_load.attr,
489         &dev_attr_engine3_load.attr,
490         &dev_attr_selftest.attr,
491         NULL
492 };
493
494 static const struct attribute_group lp5521_group = {
495         .attrs = lp5521_attributes,
496 };
497
498 /* Chip specific configurations */
499 static struct lp55xx_device_config lp5521_cfg = {
500         .reset = {
501                 .addr = LP5521_REG_RESET,
502                 .val  = LP5521_RESET,
503         },
504         .enable = {
505                 .addr = LP5521_REG_ENABLE,
506                 .val  = LP5521_ENABLE_DEFAULT,
507         },
508         .max_channel  = LP5521_MAX_LEDS,
509         .post_init_device   = lp5521_post_init_device,
510         .brightness_fn      = lp5521_led_brightness,
511         .multicolor_brightness_fn = lp5521_multicolor_brightness,
512         .set_led_current    = lp5521_set_led_current,
513         .firmware_cb        = lp5521_firmware_loaded,
514         .run_engine         = lp5521_run_engine,
515         .dev_attr_group     = &lp5521_group,
516 };
517
518 static int lp5521_probe(struct i2c_client *client)
519 {
520         const struct i2c_device_id *id = i2c_client_get_device_id(client);
521         int ret;
522         struct lp55xx_chip *chip;
523         struct lp55xx_led *led;
524         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
525         struct device_node *np = dev_of_node(&client->dev);
526
527         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
528         if (!chip)
529                 return -ENOMEM;
530
531         chip->cfg = &lp5521_cfg;
532
533         if (!pdata) {
534                 if (np) {
535                         pdata = lp55xx_of_populate_pdata(&client->dev, np,
536                                                          chip);
537                         if (IS_ERR(pdata))
538                                 return PTR_ERR(pdata);
539                 } else {
540                         dev_err(&client->dev, "no platform data\n");
541                         return -EINVAL;
542                 }
543         }
544
545         led = devm_kcalloc(&client->dev,
546                         pdata->num_channels, sizeof(*led), GFP_KERNEL);
547         if (!led)
548                 return -ENOMEM;
549
550         chip->cl = client;
551         chip->pdata = pdata;
552
553         mutex_init(&chip->lock);
554
555         i2c_set_clientdata(client, led);
556
557         ret = lp55xx_init_device(chip);
558         if (ret)
559                 goto err_init;
560
561         dev_info(&client->dev, "%s programmable led chip found\n", id->name);
562
563         ret = lp55xx_register_leds(led, chip);
564         if (ret)
565                 goto err_out;
566
567         ret = lp55xx_register_sysfs(chip);
568         if (ret) {
569                 dev_err(&client->dev, "registering sysfs failed\n");
570                 goto err_out;
571         }
572
573         return 0;
574
575 err_out:
576         lp55xx_deinit_device(chip);
577 err_init:
578         return ret;
579 }
580
581 static void lp5521_remove(struct i2c_client *client)
582 {
583         struct lp55xx_led *led = i2c_get_clientdata(client);
584         struct lp55xx_chip *chip = led->chip;
585
586         lp5521_stop_all_engines(chip);
587         lp55xx_unregister_sysfs(chip);
588         lp55xx_deinit_device(chip);
589 }
590
591 static const struct i2c_device_id lp5521_id[] = {
592         { "lp5521", 0 }, /* Three channel chip */
593         { }
594 };
595 MODULE_DEVICE_TABLE(i2c, lp5521_id);
596
597 #ifdef CONFIG_OF
598 static const struct of_device_id of_lp5521_leds_match[] = {
599         { .compatible = "national,lp5521", },
600         {},
601 };
602
603 MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
604 #endif
605 static struct i2c_driver lp5521_driver = {
606         .driver = {
607                 .name   = "lp5521",
608                 .of_match_table = of_match_ptr(of_lp5521_leds_match),
609         },
610         .probe          = lp5521_probe,
611         .remove         = lp5521_remove,
612         .id_table       = lp5521_id,
613 };
614
615 module_i2c_driver(lp5521_driver);
616
617 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
618 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
619 MODULE_DESCRIPTION("LP5521 LED engine");
620 MODULE_LICENSE("GPL v2");