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