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(min: 200, max: 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(min: 500, max: 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(chip: led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr, |
115 | val: 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: mask[idx], val: 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, val: 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: mask[idx], val: 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, val: &mode); |
178 | if (ret) |
179 | return; |
180 | |
181 | ret = lp55xx_read(chip, LP5521_REG_ENABLE, val: &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, val: mode); |
202 | lp5521_wait_opmode_done(); |
203 | |
204 | lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, val: 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, reg: addr[idx] + i, val: 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, data: fw->data, size: 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: &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(min: 10000, max: 20000); |
301 | |
302 | /* Set all PWMs to direct control mode */ |
303 | ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); |
304 | if (ret) |
305 | return ret; |
306 | |
307 | /* Update configuration for the clock setting */ |
308 | val = LP5521_DEFAULT_CFG; |
309 | if (!lp55xx_is_extclk_used(chip)) |
310 | val |= LP5521_CLK_INT; |
311 | |
312 | val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK; |
313 | |
314 | ret = lp55xx_write(chip, LP5521_REG_CONFIG, val); |
315 | if (ret) |
316 | return ret; |
317 | |
318 | /* Initialize all channels PWM to zero -> leds off */ |
319 | lp55xx_write(chip, LP5521_REG_R_PWM, val: 0); |
320 | lp55xx_write(chip, LP5521_REG_G_PWM, val: 0); |
321 | lp55xx_write(chip, LP5521_REG_B_PWM, val: 0); |
322 | |
323 | /* Set engines are set to run state when OP_MODE enables engines */ |
324 | ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM); |
325 | if (ret) |
326 | return ret; |
327 | |
328 | lp5521_wait_enable_done(); |
329 | |
330 | return 0; |
331 | } |
332 | |
333 | static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf) |
334 | { |
335 | struct lp55xx_platform_data *pdata = chip->pdata; |
336 | int ret; |
337 | u8 status; |
338 | |
339 | ret = lp55xx_read(chip, LP5521_REG_STATUS, val: &status); |
340 | if (ret < 0) |
341 | return ret; |
342 | |
343 | if (pdata->clock_mode != LP55XX_CLOCK_EXT) |
344 | return 0; |
345 | |
346 | /* Check that ext clock is really in use if requested */ |
347 | if ((status & LP5521_EXT_CLK_USED) == 0) |
348 | return -EIO; |
349 | |
350 | return 0; |
351 | } |
352 | |
353 | static int lp5521_multicolor_brightness(struct lp55xx_led *led) |
354 | { |
355 | struct lp55xx_chip *chip = led->chip; |
356 | int ret; |
357 | int i; |
358 | |
359 | mutex_lock(&chip->lock); |
360 | for (i = 0; i < led->mc_cdev.num_colors; i++) { |
361 | ret = lp55xx_write(chip, |
362 | LP5521_REG_LED_PWM_BASE + |
363 | led->mc_cdev.subled_info[i].channel, |
364 | val: led->mc_cdev.subled_info[i].brightness); |
365 | if (ret) |
366 | break; |
367 | } |
368 | mutex_unlock(lock: &chip->lock); |
369 | return ret; |
370 | } |
371 | |
372 | static int lp5521_led_brightness(struct lp55xx_led *led) |
373 | { |
374 | struct lp55xx_chip *chip = led->chip; |
375 | int ret; |
376 | |
377 | mutex_lock(&chip->lock); |
378 | ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr, |
379 | val: led->brightness); |
380 | mutex_unlock(lock: &chip->lock); |
381 | |
382 | return ret; |
383 | } |
384 | |
385 | static ssize_t show_engine_mode(struct device *dev, |
386 | struct device_attribute *attr, |
387 | char *buf, int nr) |
388 | { |
389 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
390 | struct lp55xx_chip *chip = led->chip; |
391 | enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; |
392 | |
393 | switch (mode) { |
394 | case LP55XX_ENGINE_RUN: |
395 | return sprintf(buf, fmt: "run\n" ); |
396 | case LP55XX_ENGINE_LOAD: |
397 | return sprintf(buf, fmt: "load\n" ); |
398 | case LP55XX_ENGINE_DISABLED: |
399 | default: |
400 | return sprintf(buf, fmt: "disabled\n" ); |
401 | } |
402 | } |
403 | show_mode(1) |
404 | show_mode(2) |
405 | show_mode(3) |
406 | |
407 | static ssize_t store_engine_mode(struct device *dev, |
408 | struct device_attribute *attr, |
409 | const char *buf, size_t len, int nr) |
410 | { |
411 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
412 | struct lp55xx_chip *chip = led->chip; |
413 | struct lp55xx_engine *engine = &chip->engines[nr - 1]; |
414 | |
415 | mutex_lock(&chip->lock); |
416 | |
417 | chip->engine_idx = nr; |
418 | |
419 | if (!strncmp(buf, "run" , 3)) { |
420 | lp5521_run_engine(chip, start: true); |
421 | engine->mode = LP55XX_ENGINE_RUN; |
422 | } else if (!strncmp(buf, "load" , 4)) { |
423 | lp5521_stop_engine(chip); |
424 | lp5521_load_engine(chip); |
425 | engine->mode = LP55XX_ENGINE_LOAD; |
426 | } else if (!strncmp(buf, "disabled" , 8)) { |
427 | lp5521_stop_engine(chip); |
428 | engine->mode = LP55XX_ENGINE_DISABLED; |
429 | } |
430 | |
431 | mutex_unlock(lock: &chip->lock); |
432 | |
433 | return len; |
434 | } |
435 | store_mode(1) |
436 | store_mode(2) |
437 | store_mode(3) |
438 | |
439 | static ssize_t store_engine_load(struct device *dev, |
440 | struct device_attribute *attr, |
441 | const char *buf, size_t len, int nr) |
442 | { |
443 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
444 | struct lp55xx_chip *chip = led->chip; |
445 | int ret; |
446 | |
447 | mutex_lock(&chip->lock); |
448 | |
449 | chip->engine_idx = nr; |
450 | lp5521_load_engine(chip); |
451 | ret = lp5521_update_program_memory(chip, data: buf, size: len); |
452 | |
453 | mutex_unlock(lock: &chip->lock); |
454 | |
455 | return ret; |
456 | } |
457 | store_load(1) |
458 | store_load(2) |
459 | store_load(3) |
460 | |
461 | static ssize_t lp5521_selftest(struct device *dev, |
462 | struct device_attribute *attr, |
463 | char *buf) |
464 | { |
465 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
466 | struct lp55xx_chip *chip = led->chip; |
467 | int ret; |
468 | |
469 | mutex_lock(&chip->lock); |
470 | ret = lp5521_run_selftest(chip, buf); |
471 | mutex_unlock(lock: &chip->lock); |
472 | |
473 | return sysfs_emit(buf, fmt: "%s\n" , ret ? "FAIL" : "OK" ); |
474 | } |
475 | |
476 | /* device attributes */ |
477 | static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); |
478 | static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); |
479 | static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); |
480 | static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); |
481 | static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); |
482 | static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); |
483 | static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest); |
484 | |
485 | static struct attribute *lp5521_attributes[] = { |
486 | &dev_attr_engine1_mode.attr, |
487 | &dev_attr_engine2_mode.attr, |
488 | &dev_attr_engine3_mode.attr, |
489 | &dev_attr_engine1_load.attr, |
490 | &dev_attr_engine2_load.attr, |
491 | &dev_attr_engine3_load.attr, |
492 | &dev_attr_selftest.attr, |
493 | NULL |
494 | }; |
495 | |
496 | static const struct attribute_group lp5521_group = { |
497 | .attrs = lp5521_attributes, |
498 | }; |
499 | |
500 | /* Chip specific configurations */ |
501 | static struct lp55xx_device_config lp5521_cfg = { |
502 | .reset = { |
503 | .addr = LP5521_REG_RESET, |
504 | .val = LP5521_RESET, |
505 | }, |
506 | .enable = { |
507 | .addr = LP5521_REG_ENABLE, |
508 | .val = LP5521_ENABLE_DEFAULT, |
509 | }, |
510 | .max_channel = LP5521_MAX_LEDS, |
511 | .post_init_device = lp5521_post_init_device, |
512 | .brightness_fn = lp5521_led_brightness, |
513 | .multicolor_brightness_fn = lp5521_multicolor_brightness, |
514 | .set_led_current = lp5521_set_led_current, |
515 | .firmware_cb = lp5521_firmware_loaded, |
516 | .run_engine = lp5521_run_engine, |
517 | .dev_attr_group = &lp5521_group, |
518 | }; |
519 | |
520 | static int lp5521_probe(struct i2c_client *client) |
521 | { |
522 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
523 | int ret; |
524 | struct lp55xx_chip *chip; |
525 | struct lp55xx_led *led; |
526 | struct lp55xx_platform_data *pdata = dev_get_platdata(dev: &client->dev); |
527 | struct device_node *np = dev_of_node(dev: &client->dev); |
528 | |
529 | chip = devm_kzalloc(dev: &client->dev, size: sizeof(*chip), GFP_KERNEL); |
530 | if (!chip) |
531 | return -ENOMEM; |
532 | |
533 | chip->cfg = &lp5521_cfg; |
534 | |
535 | if (!pdata) { |
536 | if (np) { |
537 | pdata = lp55xx_of_populate_pdata(dev: &client->dev, np, |
538 | chip); |
539 | if (IS_ERR(ptr: pdata)) |
540 | return PTR_ERR(ptr: pdata); |
541 | } else { |
542 | dev_err(&client->dev, "no platform data\n" ); |
543 | return -EINVAL; |
544 | } |
545 | } |
546 | |
547 | led = devm_kcalloc(dev: &client->dev, |
548 | n: pdata->num_channels, size: sizeof(*led), GFP_KERNEL); |
549 | if (!led) |
550 | return -ENOMEM; |
551 | |
552 | chip->cl = client; |
553 | chip->pdata = pdata; |
554 | |
555 | mutex_init(&chip->lock); |
556 | |
557 | i2c_set_clientdata(client, data: led); |
558 | |
559 | ret = lp55xx_init_device(chip); |
560 | if (ret) |
561 | goto err_init; |
562 | |
563 | dev_info(&client->dev, "%s programmable led chip found\n" , id->name); |
564 | |
565 | ret = lp55xx_register_leds(led, chip); |
566 | if (ret) |
567 | goto err_out; |
568 | |
569 | ret = lp55xx_register_sysfs(chip); |
570 | if (ret) { |
571 | dev_err(&client->dev, "registering sysfs failed\n" ); |
572 | goto err_out; |
573 | } |
574 | |
575 | return 0; |
576 | |
577 | err_out: |
578 | lp55xx_deinit_device(chip); |
579 | err_init: |
580 | return ret; |
581 | } |
582 | |
583 | static void lp5521_remove(struct i2c_client *client) |
584 | { |
585 | struct lp55xx_led *led = i2c_get_clientdata(client); |
586 | struct lp55xx_chip *chip = led->chip; |
587 | |
588 | lp5521_stop_all_engines(chip); |
589 | lp55xx_unregister_sysfs(chip); |
590 | lp55xx_deinit_device(chip); |
591 | } |
592 | |
593 | static const struct i2c_device_id lp5521_id[] = { |
594 | { "lp5521" , 0 }, /* Three channel chip */ |
595 | { } |
596 | }; |
597 | MODULE_DEVICE_TABLE(i2c, lp5521_id); |
598 | |
599 | static const struct of_device_id of_lp5521_leds_match[] = { |
600 | { .compatible = "national,lp5521" , }, |
601 | {}, |
602 | }; |
603 | |
604 | MODULE_DEVICE_TABLE(of, of_lp5521_leds_match); |
605 | |
606 | static struct i2c_driver lp5521_driver = { |
607 | .driver = { |
608 | .name = "lp5521" , |
609 | .of_match_table = of_lp5521_leds_match, |
610 | }, |
611 | .probe = lp5521_probe, |
612 | .remove = lp5521_remove, |
613 | .id_table = lp5521_id, |
614 | }; |
615 | |
616 | module_i2c_driver(lp5521_driver); |
617 | |
618 | MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo" ); |
619 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>" ); |
620 | MODULE_DESCRIPTION("LP5521 LED engine" ); |
621 | MODULE_LICENSE("GPL v2" ); |
622 | |