mmc: core: Update CMD13 busy check for CMD6 commands
[linux-2.6-microblaze.git] / drivers / leds / leds-lp5562.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * LP5562 LED driver
4  *
5  * Copyright (C) 2013 Texas Instruments
6  *
7  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8  */
9
10 #include <linux/delay.h>
11 #include <linux/firmware.h>
12 #include <linux/i2c.h>
13 #include <linux/leds.h>
14 #include <linux/module.h>
15 #include <linux/mutex.h>
16 #include <linux/of.h>
17 #include <linux/platform_data/leds-lp55xx.h>
18 #include <linux/slab.h>
19
20 #include "leds-lp55xx-common.h"
21
22 #define LP5562_PROGRAM_LENGTH           32
23 #define LP5562_MAX_LEDS                 4
24
25 /* ENABLE Register 00h */
26 #define LP5562_REG_ENABLE               0x00
27 #define LP5562_EXEC_ENG1_M              0x30
28 #define LP5562_EXEC_ENG2_M              0x0C
29 #define LP5562_EXEC_ENG3_M              0x03
30 #define LP5562_EXEC_M                   0x3F
31 #define LP5562_MASTER_ENABLE            0x40    /* Chip master enable */
32 #define LP5562_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
33 #define LP5562_EXEC_RUN                 0x2A
34 #define LP5562_ENABLE_DEFAULT   \
35         (LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
36 #define LP5562_ENABLE_RUN_PROGRAM       \
37         (LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)
38
39 /* OPMODE Register 01h */
40 #define LP5562_REG_OP_MODE              0x01
41 #define LP5562_MODE_ENG1_M              0x30
42 #define LP5562_MODE_ENG2_M              0x0C
43 #define LP5562_MODE_ENG3_M              0x03
44 #define LP5562_LOAD_ENG1                0x10
45 #define LP5562_LOAD_ENG2                0x04
46 #define LP5562_LOAD_ENG3                0x01
47 #define LP5562_RUN_ENG1                 0x20
48 #define LP5562_RUN_ENG2                 0x08
49 #define LP5562_RUN_ENG3                 0x02
50 #define LP5562_ENG1_IS_LOADING(mode)    \
51         ((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1)
52 #define LP5562_ENG2_IS_LOADING(mode)    \
53         ((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2)
54 #define LP5562_ENG3_IS_LOADING(mode)    \
55         ((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3)
56
57 /* BRIGHTNESS Registers */
58 #define LP5562_REG_R_PWM                0x04
59 #define LP5562_REG_G_PWM                0x03
60 #define LP5562_REG_B_PWM                0x02
61 #define LP5562_REG_W_PWM                0x0E
62
63 /* CURRENT Registers */
64 #define LP5562_REG_R_CURRENT            0x07
65 #define LP5562_REG_G_CURRENT            0x06
66 #define LP5562_REG_B_CURRENT            0x05
67 #define LP5562_REG_W_CURRENT            0x0F
68
69 /* CONFIG Register 08h */
70 #define LP5562_REG_CONFIG               0x08
71 #define LP5562_PWM_HF                   0x40
72 #define LP5562_PWRSAVE_EN               0x20
73 #define LP5562_CLK_INT                  0x01    /* Internal clock */
74 #define LP5562_DEFAULT_CFG              (LP5562_PWM_HF | LP5562_PWRSAVE_EN)
75
76 /* RESET Register 0Dh */
77 #define LP5562_REG_RESET                0x0D
78 #define LP5562_RESET                    0xFF
79
80 /* PROGRAM ENGINE Registers */
81 #define LP5562_REG_PROG_MEM_ENG1        0x10
82 #define LP5562_REG_PROG_MEM_ENG2        0x30
83 #define LP5562_REG_PROG_MEM_ENG3        0x50
84
85 /* LEDMAP Register 70h */
86 #define LP5562_REG_ENG_SEL              0x70
87 #define LP5562_ENG_SEL_PWM              0
88 #define LP5562_ENG_FOR_RGB_M            0x3F
89 #define LP5562_ENG_SEL_RGB              0x1B    /* R:ENG1, G:ENG2, B:ENG3 */
90 #define LP5562_ENG_FOR_W_M              0xC0
91 #define LP5562_ENG1_FOR_W               0x40    /* W:ENG1 */
92 #define LP5562_ENG2_FOR_W               0x80    /* W:ENG2 */
93 #define LP5562_ENG3_FOR_W               0xC0    /* W:ENG3 */
94
95 /* Program Commands */
96 #define LP5562_CMD_DISABLE              0x00
97 #define LP5562_CMD_LOAD                 0x15
98 #define LP5562_CMD_RUN                  0x2A
99 #define LP5562_CMD_DIRECT               0x3F
100 #define LP5562_PATTERN_OFF              0
101
102 static inline void lp5562_wait_opmode_done(void)
103 {
104         /* operation mode change needs to be longer than 153 us */
105         usleep_range(200, 300);
106 }
107
108 static inline void lp5562_wait_enable_done(void)
109 {
110         /* it takes more 488 us to update ENABLE register */
111         usleep_range(500, 600);
112 }
113
114 static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
115 {
116         static const u8 addr[] = {
117                 LP5562_REG_R_CURRENT,
118                 LP5562_REG_G_CURRENT,
119                 LP5562_REG_B_CURRENT,
120                 LP5562_REG_W_CURRENT,
121         };
122
123         led->led_current = led_current;
124         lp55xx_write(led->chip, addr[led->chan_nr], led_current);
125 }
126
127 static void lp5562_load_engine(struct lp55xx_chip *chip)
128 {
129         enum lp55xx_engine_index idx = chip->engine_idx;
130         static const u8 mask[] = {
131                 [LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
132                 [LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
133                 [LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
134         };
135
136         static const u8 val[] = {
137                 [LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
138                 [LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
139                 [LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
140         };
141
142         lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]);
143
144         lp5562_wait_opmode_done();
145 }
146
147 static void lp5562_stop_engine(struct lp55xx_chip *chip)
148 {
149         lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
150         lp5562_wait_opmode_done();
151 }
152
153 static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
154 {
155         int ret;
156         u8 mode;
157         u8 exec;
158
159         /* stop engine */
160         if (!start) {
161                 lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
162                 lp5562_wait_enable_done();
163                 lp5562_stop_engine(chip);
164                 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
165                 lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
166                 lp5562_wait_opmode_done();
167                 return;
168         }
169
170         /*
171          * To run the engine,
172          * operation mode and enable register should updated at the same time
173          */
174
175         ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode);
176         if (ret)
177                 return;
178
179         ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec);
180         if (ret)
181                 return;
182
183         /* change operation mode to RUN only when each engine is loading */
184         if (LP5562_ENG1_IS_LOADING(mode)) {
185                 mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1;
186                 exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1;
187         }
188
189         if (LP5562_ENG2_IS_LOADING(mode)) {
190                 mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2;
191                 exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2;
192         }
193
194         if (LP5562_ENG3_IS_LOADING(mode)) {
195                 mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3;
196                 exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3;
197         }
198
199         lp55xx_write(chip, LP5562_REG_OP_MODE, mode);
200         lp5562_wait_opmode_done();
201
202         lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec);
203         lp5562_wait_enable_done();
204 }
205
206 static int lp5562_update_firmware(struct lp55xx_chip *chip,
207                                         const u8 *data, size_t size)
208 {
209         enum lp55xx_engine_index idx = chip->engine_idx;
210         u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
211         static const u8 addr[] = {
212                 [LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
213                 [LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
214                 [LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
215         };
216         unsigned cmd;
217         char c[3];
218         int program_size;
219         int nrchars;
220         int offset = 0;
221         int ret;
222         int i;
223
224         /* clear program memory before updating */
225         for (i = 0; i < LP5562_PROGRAM_LENGTH; i++)
226                 lp55xx_write(chip, addr[idx] + i, 0);
227
228         i = 0;
229         while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) {
230                 /* separate sscanfs because length is working only for %s */
231                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
232                 if (ret != 1)
233                         goto err;
234
235                 ret = sscanf(c, "%2x", &cmd);
236                 if (ret != 1)
237                         goto err;
238
239                 pattern[i] = (u8)cmd;
240                 offset += nrchars;
241                 i++;
242         }
243
244         /* Each instruction is 16bit long. Check that length is even */
245         if (i % 2)
246                 goto err;
247
248         program_size = i;
249         for (i = 0; i < program_size; i++)
250                 lp55xx_write(chip, addr[idx] + i, pattern[i]);
251
252         return 0;
253
254 err:
255         dev_err(&chip->cl->dev, "wrong pattern format\n");
256         return -EINVAL;
257 }
258
259 static void lp5562_firmware_loaded(struct lp55xx_chip *chip)
260 {
261         const struct firmware *fw = chip->fw;
262
263         /*
264          * the firmware is encoded in ascii hex character, with 2 chars
265          * per byte
266          */
267         if (fw->size > (LP5562_PROGRAM_LENGTH * 2)) {
268                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
269                         fw->size);
270                 return;
271         }
272
273         /*
274          * Program memory sequence
275          *  1) set engine mode to "LOAD"
276          *  2) write firmware data into program memory
277          */
278
279         lp5562_load_engine(chip);
280         lp5562_update_firmware(chip, fw->data, fw->size);
281 }
282
283 static int lp5562_post_init_device(struct lp55xx_chip *chip)
284 {
285         int ret;
286         u8 cfg = LP5562_DEFAULT_CFG;
287
288         /* Set all PWMs to direct control mode */
289         ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
290         if (ret)
291                 return ret;
292
293         lp5562_wait_opmode_done();
294
295         /* Update configuration for the clock setting */
296         if (!lp55xx_is_extclk_used(chip))
297                 cfg |= LP5562_CLK_INT;
298
299         ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg);
300         if (ret)
301                 return ret;
302
303         /* Initialize all channels PWM to zero -> leds off */
304         lp55xx_write(chip, LP5562_REG_R_PWM, 0);
305         lp55xx_write(chip, LP5562_REG_G_PWM, 0);
306         lp55xx_write(chip, LP5562_REG_B_PWM, 0);
307         lp55xx_write(chip, LP5562_REG_W_PWM, 0);
308
309         /* Set LED map as register PWM by default */
310         lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
311
312         return 0;
313 }
314
315 static int lp5562_led_brightness(struct lp55xx_led *led)
316 {
317         struct lp55xx_chip *chip = led->chip;
318         static const u8 addr[] = {
319                 LP5562_REG_R_PWM,
320                 LP5562_REG_G_PWM,
321                 LP5562_REG_B_PWM,
322                 LP5562_REG_W_PWM,
323         };
324         int ret;
325
326         mutex_lock(&chip->lock);
327         ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness);
328         mutex_unlock(&chip->lock);
329
330         return ret;
331 }
332
333 static void lp5562_write_program_memory(struct lp55xx_chip *chip,
334                                         u8 base, const u8 *rgb, int size)
335 {
336         int i;
337
338         if (!rgb || size <= 0)
339                 return;
340
341         for (i = 0; i < size; i++)
342                 lp55xx_write(chip, base + i, *(rgb + i));
343
344         lp55xx_write(chip, base + i, 0);
345         lp55xx_write(chip, base + i + 1, 0);
346 }
347
348 /* check the size of program count */
349 static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
350 {
351         return ptn->size_r >= LP5562_PROGRAM_LENGTH ||
352                ptn->size_g >= LP5562_PROGRAM_LENGTH ||
353                ptn->size_b >= LP5562_PROGRAM_LENGTH;
354 }
355
356 static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
357 {
358         struct lp55xx_predef_pattern *ptn;
359         int i;
360
361         if (mode == LP5562_PATTERN_OFF) {
362                 lp5562_run_engine(chip, false);
363                 return 0;
364         }
365
366         ptn = chip->pdata->patterns + (mode - 1);
367         if (!ptn || _is_pc_overflow(ptn)) {
368                 dev_err(&chip->cl->dev, "invalid pattern data\n");
369                 return -EINVAL;
370         }
371
372         lp5562_stop_engine(chip);
373
374         /* Set LED map as RGB */
375         lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
376
377         /* Load engines */
378         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
379                 chip->engine_idx = i;
380                 lp5562_load_engine(chip);
381         }
382
383         /* Clear program registers */
384         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
385         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
386         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
387         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
388         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
389         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);
390
391         /* Program engines */
392         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
393                                 ptn->r, ptn->size_r);
394         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
395                                 ptn->g, ptn->size_g);
396         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
397                                 ptn->b, ptn->size_b);
398
399         /* Run engines */
400         lp5562_run_engine(chip, true);
401
402         return 0;
403 }
404
405 static ssize_t lp5562_store_pattern(struct device *dev,
406                                 struct device_attribute *attr,
407                                 const char *buf, size_t len)
408 {
409         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
410         struct lp55xx_chip *chip = led->chip;
411         struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
412         int num_patterns = chip->pdata->num_patterns;
413         unsigned long mode;
414         int ret;
415
416         ret = kstrtoul(buf, 0, &mode);
417         if (ret)
418                 return ret;
419
420         if (mode > num_patterns || !ptn)
421                 return -EINVAL;
422
423         mutex_lock(&chip->lock);
424         ret = lp5562_run_predef_led_pattern(chip, mode);
425         mutex_unlock(&chip->lock);
426
427         if (ret)
428                 return ret;
429
430         return len;
431 }
432
433 static ssize_t lp5562_store_engine_mux(struct device *dev,
434                                      struct device_attribute *attr,
435                                      const char *buf, size_t len)
436 {
437         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
438         struct lp55xx_chip *chip = led->chip;
439         u8 mask;
440         u8 val;
441
442         /* LED map
443          * R ... Engine 1 (fixed)
444          * G ... Engine 2 (fixed)
445          * B ... Engine 3 (fixed)
446          * W ... Engine 1 or 2 or 3
447          */
448
449         if (sysfs_streq(buf, "RGB")) {
450                 mask = LP5562_ENG_FOR_RGB_M;
451                 val = LP5562_ENG_SEL_RGB;
452         } else if (sysfs_streq(buf, "W")) {
453                 enum lp55xx_engine_index idx = chip->engine_idx;
454
455                 mask = LP5562_ENG_FOR_W_M;
456                 switch (idx) {
457                 case LP55XX_ENGINE_1:
458                         val = LP5562_ENG1_FOR_W;
459                         break;
460                 case LP55XX_ENGINE_2:
461                         val = LP5562_ENG2_FOR_W;
462                         break;
463                 case LP55XX_ENGINE_3:
464                         val = LP5562_ENG3_FOR_W;
465                         break;
466                 default:
467                         return -EINVAL;
468                 }
469
470         } else {
471                 dev_err(dev, "choose RGB or W\n");
472                 return -EINVAL;
473         }
474
475         mutex_lock(&chip->lock);
476         lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
477         mutex_unlock(&chip->lock);
478
479         return len;
480 }
481
482 static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern);
483 static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux);
484
485 static struct attribute *lp5562_attributes[] = {
486         &dev_attr_led_pattern.attr,
487         &dev_attr_engine_mux.attr,
488         NULL,
489 };
490
491 static const struct attribute_group lp5562_group = {
492         .attrs = lp5562_attributes,
493 };
494
495 /* Chip specific configurations */
496 static struct lp55xx_device_config lp5562_cfg = {
497         .max_channel  = LP5562_MAX_LEDS,
498         .reset = {
499                 .addr = LP5562_REG_RESET,
500                 .val  = LP5562_RESET,
501         },
502         .enable = {
503                 .addr = LP5562_REG_ENABLE,
504                 .val  = LP5562_ENABLE_DEFAULT,
505         },
506         .post_init_device   = lp5562_post_init_device,
507         .set_led_current    = lp5562_set_led_current,
508         .brightness_fn      = lp5562_led_brightness,
509         .run_engine         = lp5562_run_engine,
510         .firmware_cb        = lp5562_firmware_loaded,
511         .dev_attr_group     = &lp5562_group,
512 };
513
514 static int lp5562_probe(struct i2c_client *client,
515                         const struct i2c_device_id *id)
516 {
517         int ret;
518         struct lp55xx_chip *chip;
519         struct lp55xx_led *led;
520         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
521         struct device_node *np = client->dev.of_node;
522
523         if (!pdata) {
524                 if (np) {
525                         pdata = lp55xx_of_populate_pdata(&client->dev, np);
526                         if (IS_ERR(pdata))
527                                 return PTR_ERR(pdata);
528                 } else {
529                         dev_err(&client->dev, "no platform data\n");
530                         return -EINVAL;
531                 }
532         }
533
534         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
535         if (!chip)
536                 return -ENOMEM;
537
538         led = devm_kcalloc(&client->dev,
539                         pdata->num_channels, sizeof(*led), GFP_KERNEL);
540         if (!led)
541                 return -ENOMEM;
542
543         chip->cl = client;
544         chip->pdata = pdata;
545         chip->cfg = &lp5562_cfg;
546
547         mutex_init(&chip->lock);
548
549         i2c_set_clientdata(client, led);
550
551         ret = lp55xx_init_device(chip);
552         if (ret)
553                 goto err_init;
554
555         ret = lp55xx_register_leds(led, chip);
556         if (ret)
557                 goto err_register_leds;
558
559         ret = lp55xx_register_sysfs(chip);
560         if (ret) {
561                 dev_err(&client->dev, "registering sysfs failed\n");
562                 goto err_register_sysfs;
563         }
564
565         return 0;
566
567 err_register_sysfs:
568         lp55xx_unregister_leds(led, chip);
569 err_register_leds:
570         lp55xx_deinit_device(chip);
571 err_init:
572         return ret;
573 }
574
575 static int lp5562_remove(struct i2c_client *client)
576 {
577         struct lp55xx_led *led = i2c_get_clientdata(client);
578         struct lp55xx_chip *chip = led->chip;
579
580         lp5562_stop_engine(chip);
581
582         lp55xx_unregister_sysfs(chip);
583         lp55xx_unregister_leds(led, chip);
584         lp55xx_deinit_device(chip);
585
586         return 0;
587 }
588
589 static const struct i2c_device_id lp5562_id[] = {
590         { "lp5562", 0 },
591         { }
592 };
593 MODULE_DEVICE_TABLE(i2c, lp5562_id);
594
595 #ifdef CONFIG_OF
596 static const struct of_device_id of_lp5562_leds_match[] = {
597         { .compatible = "ti,lp5562", },
598         {},
599 };
600
601 MODULE_DEVICE_TABLE(of, of_lp5562_leds_match);
602 #endif
603
604 static struct i2c_driver lp5562_driver = {
605         .driver = {
606                 .name   = "lp5562",
607                 .of_match_table = of_match_ptr(of_lp5562_leds_match),
608         },
609         .probe          = lp5562_probe,
610         .remove         = lp5562_remove,
611         .id_table       = lp5562_id,
612 };
613
614 module_i2c_driver(lp5562_driver);
615
616 MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
617 MODULE_AUTHOR("Milo Kim");
618 MODULE_LICENSE("GPL");