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500fe141 SO |
1 | /* |
2 | * LP5521 LED chip driver. | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/gpio.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/ctype.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/wait.h> | |
33 | #include <linux/leds.h> | |
34 | #include <linux/leds-lp5521.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <linux/slab.h> | |
6a0c9a47 MWK |
37 | #include <linux/platform_data/leds-lp55xx.h> |
38 | ||
39 | #include "leds-lp55xx-common.h" | |
500fe141 SO |
40 | |
41 | #define LP5521_PROGRAM_LENGTH 32 /* in bytes */ | |
42 | ||
43 | #define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */ | |
44 | #define LP5521_MAX_ENGINES 3 /* Maximum number of engines */ | |
45 | ||
46 | #define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */ | |
47 | #define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */ | |
48 | ||
49 | #define LP5521_CMD_LOAD 0x15 /* 00010101 */ | |
50 | #define LP5521_CMD_RUN 0x2a /* 00101010 */ | |
51 | #define LP5521_CMD_DIRECT 0x3f /* 00111111 */ | |
52 | #define LP5521_CMD_DISABLED 0x00 /* 00000000 */ | |
53 | ||
54 | /* Registers */ | |
55 | #define LP5521_REG_ENABLE 0x00 | |
56 | #define LP5521_REG_OP_MODE 0x01 | |
57 | #define LP5521_REG_R_PWM 0x02 | |
58 | #define LP5521_REG_G_PWM 0x03 | |
59 | #define LP5521_REG_B_PWM 0x04 | |
60 | #define LP5521_REG_R_CURRENT 0x05 | |
61 | #define LP5521_REG_G_CURRENT 0x06 | |
62 | #define LP5521_REG_B_CURRENT 0x07 | |
63 | #define LP5521_REG_CONFIG 0x08 | |
64 | #define LP5521_REG_R_CHANNEL_PC 0x09 | |
65 | #define LP5521_REG_G_CHANNEL_PC 0x0A | |
66 | #define LP5521_REG_B_CHANNEL_PC 0x0B | |
67 | #define LP5521_REG_STATUS 0x0C | |
68 | #define LP5521_REG_RESET 0x0D | |
69 | #define LP5521_REG_GPO 0x0E | |
70 | #define LP5521_REG_R_PROG_MEM 0x10 | |
71 | #define LP5521_REG_G_PROG_MEM 0x30 | |
72 | #define LP5521_REG_B_PROG_MEM 0x50 | |
73 | ||
74 | #define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM | |
75 | #define LP5521_PROG_MEM_SIZE 0x20 | |
76 | ||
77 | /* Base register to set LED current */ | |
78 | #define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT | |
79 | ||
80 | /* Base register to set the brightness */ | |
81 | #define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM | |
82 | ||
83 | /* Bits in ENABLE register */ | |
84 | #define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */ | |
85 | #define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */ | |
86 | #define LP5521_EXEC_RUN 0x2A | |
32a2f747 KM |
87 | #define LP5521_ENABLE_DEFAULT \ |
88 | (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM) | |
89 | #define LP5521_ENABLE_RUN_PROGRAM \ | |
90 | (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN) | |
500fe141 | 91 | |
500fe141 SO |
92 | /* Status */ |
93 | #define LP5521_EXT_CLK_USED 0x08 | |
94 | ||
b3c49c05 SK |
95 | /* default R channel current register value */ |
96 | #define LP5521_REG_R_CURR_DEFAULT 0xAF | |
97 | ||
011af7bc KM |
98 | /* Pattern Mode */ |
99 | #define PATTERN_OFF 0 | |
100 | ||
48068d5d MWK |
101 | /* Reset register value */ |
102 | #define LP5521_RESET 0xFF | |
103 | ||
500fe141 | 104 | struct lp5521_engine { |
500fe141 SO |
105 | int id; |
106 | u8 mode; | |
107 | u8 prog_page; | |
108 | u8 engine_mask; | |
109 | }; | |
110 | ||
111 | struct lp5521_led { | |
112 | int id; | |
113 | u8 chan_nr; | |
114 | u8 led_current; | |
115 | u8 max_current; | |
116 | struct led_classdev cdev; | |
117 | struct work_struct brightness_work; | |
118 | u8 brightness; | |
119 | }; | |
120 | ||
121 | struct lp5521_chip { | |
122 | struct lp5521_platform_data *pdata; | |
123 | struct mutex lock; /* Serialize control */ | |
124 | struct i2c_client *client; | |
125 | struct lp5521_engine engines[LP5521_MAX_ENGINES]; | |
126 | struct lp5521_led leds[LP5521_MAX_LEDS]; | |
127 | u8 num_channels; | |
128 | u8 num_leds; | |
129 | }; | |
130 | ||
94482174 MWK |
131 | static inline void lp5521_wait_enable_done(void) |
132 | { | |
133 | /* it takes more 488 us to update ENABLE register */ | |
134 | usleep_range(500, 600); | |
135 | } | |
136 | ||
9fdb18b6 SO |
137 | static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev) |
138 | { | |
139 | return container_of(cdev, struct lp5521_led, cdev); | |
140 | } | |
141 | ||
142 | static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine) | |
143 | { | |
144 | return container_of(engine, struct lp5521_chip, | |
145 | engines[engine->id - 1]); | |
146 | } | |
147 | ||
148 | static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led) | |
149 | { | |
150 | return container_of(led, struct lp5521_chip, | |
151 | leds[led->id]); | |
152 | } | |
500fe141 SO |
153 | |
154 | static void lp5521_led_brightness_work(struct work_struct *work); | |
155 | ||
156 | static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value) | |
157 | { | |
158 | return i2c_smbus_write_byte_data(client, reg, value); | |
159 | } | |
160 | ||
161 | static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf) | |
162 | { | |
163 | s32 ret; | |
164 | ||
165 | ret = i2c_smbus_read_byte_data(client, reg); | |
166 | if (ret < 0) | |
313e8b50 | 167 | return ret; |
500fe141 SO |
168 | |
169 | *buf = ret; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode) | |
174 | { | |
175 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
176 | struct i2c_client *client = chip->client; | |
177 | int ret; | |
178 | u8 engine_state; | |
179 | ||
180 | /* Only transition between RUN and DIRECT mode are handled here */ | |
181 | if (mode == LP5521_CMD_LOAD) | |
182 | return 0; | |
183 | ||
184 | if (mode == LP5521_CMD_DISABLED) | |
185 | mode = LP5521_CMD_DIRECT; | |
186 | ||
187 | ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state); | |
fa0ea0e1 AL |
188 | if (ret < 0) |
189 | return ret; | |
500fe141 SO |
190 | |
191 | /* set mode only for this engine */ | |
192 | engine_state &= ~(engine->engine_mask); | |
193 | mode &= engine->engine_mask; | |
194 | engine_state |= mode; | |
fa0ea0e1 | 195 | return lp5521_write(client, LP5521_REG_OP_MODE, engine_state); |
500fe141 SO |
196 | } |
197 | ||
198 | static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern) | |
199 | { | |
200 | struct lp5521_chip *chip = engine_to_lp5521(eng); | |
201 | struct i2c_client *client = chip->client; | |
202 | int ret; | |
203 | int addr; | |
204 | u8 mode; | |
205 | ||
206 | /* move current engine to direct mode and remember the state */ | |
207 | ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT); | |
5bc9ad77 DC |
208 | if (ret) |
209 | return ret; | |
210 | ||
09c76b0f SO |
211 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
212 | usleep_range(1000, 2000); | |
5bc9ad77 DC |
213 | ret = lp5521_read(client, LP5521_REG_OP_MODE, &mode); |
214 | if (ret) | |
215 | return ret; | |
500fe141 SO |
216 | |
217 | /* For loading, all the engines to load mode */ | |
218 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); | |
09c76b0f SO |
219 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
220 | usleep_range(1000, 2000); | |
500fe141 | 221 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD); |
09c76b0f SO |
222 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
223 | usleep_range(1000, 2000); | |
500fe141 SO |
224 | |
225 | addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE; | |
226 | i2c_smbus_write_i2c_block_data(client, | |
227 | addr, | |
228 | LP5521_PROG_MEM_SIZE, | |
229 | pattern); | |
230 | ||
5bc9ad77 | 231 | return lp5521_write(client, LP5521_REG_OP_MODE, mode); |
500fe141 SO |
232 | } |
233 | ||
234 | static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr) | |
235 | { | |
236 | return lp5521_write(chip->client, | |
237 | LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
238 | curr); | |
239 | } | |
240 | ||
ffbdccdb | 241 | static int lp5521_post_init_device(struct lp55xx_chip *chip) |
500fe141 | 242 | { |
500fe141 | 243 | int ret; |
94482174 | 244 | u8 val; |
500fe141 | 245 | |
94482174 MWK |
246 | /* |
247 | * Make sure that the chip is reset by reading back the r channel | |
248 | * current reg. This is dummy read is required on some platforms - | |
249 | * otherwise further access to the R G B channels in the | |
250 | * LP5521_REG_ENABLE register will not have any effect - strange! | |
251 | */ | |
ffbdccdb | 252 | ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val); |
94482174 | 253 | if (ret) { |
ffbdccdb | 254 | dev_err(&chip->cl->dev, "error in resetting chip\n"); |
94482174 MWK |
255 | return ret; |
256 | } | |
257 | if (val != LP5521_REG_R_CURR_DEFAULT) { | |
ffbdccdb | 258 | dev_err(&chip->cl->dev, |
94482174 MWK |
259 | "unexpected data in register (expected 0x%x got 0x%x)\n", |
260 | LP5521_REG_R_CURR_DEFAULT, val); | |
261 | ret = -EINVAL; | |
262 | return ret; | |
263 | } | |
264 | usleep_range(10000, 20000); | |
500fe141 | 265 | |
500fe141 | 266 | /* Set all PWMs to direct control mode */ |
ffbdccdb | 267 | ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); |
500fe141 | 268 | |
ffbdccdb | 269 | val = chip->pdata->update_config ? |
3b49aacd | 270 | : (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT); |
ffbdccdb | 271 | ret = lp55xx_write(chip, LP5521_REG_CONFIG, val); |
94482174 MWK |
272 | if (ret) |
273 | return ret; | |
500fe141 SO |
274 | |
275 | /* Initialize all channels PWM to zero -> leds off */ | |
ffbdccdb MWK |
276 | lp55xx_write(chip, LP5521_REG_R_PWM, 0); |
277 | lp55xx_write(chip, LP5521_REG_G_PWM, 0); | |
278 | lp55xx_write(chip, LP5521_REG_B_PWM, 0); | |
500fe141 SO |
279 | |
280 | /* Set engines are set to run state when OP_MODE enables engines */ | |
ffbdccdb | 281 | ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM); |
94482174 MWK |
282 | if (ret) |
283 | return ret; | |
500fe141 | 284 | |
94482174 MWK |
285 | lp5521_wait_enable_done(); |
286 | ||
287 | return 0; | |
500fe141 SO |
288 | } |
289 | ||
290 | static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf) | |
291 | { | |
292 | int ret; | |
293 | u8 status; | |
294 | ||
295 | ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status); | |
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
299 | /* Check that ext clock is really in use if requested */ | |
300 | if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT) | |
301 | if ((status & LP5521_EXT_CLK_USED) == 0) | |
302 | return -EIO; | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static void lp5521_set_brightness(struct led_classdev *cdev, | |
307 | enum led_brightness brightness) | |
308 | { | |
309 | struct lp5521_led *led = cdev_to_led(cdev); | |
310 | led->brightness = (u8)brightness; | |
311 | schedule_work(&led->brightness_work); | |
312 | } | |
313 | ||
314 | static void lp5521_led_brightness_work(struct work_struct *work) | |
315 | { | |
316 | struct lp5521_led *led = container_of(work, | |
317 | struct lp5521_led, | |
318 | brightness_work); | |
319 | struct lp5521_chip *chip = led_to_lp5521(led); | |
320 | struct i2c_client *client = chip->client; | |
321 | ||
322 | mutex_lock(&chip->lock); | |
323 | lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr, | |
324 | led->brightness); | |
325 | mutex_unlock(&chip->lock); | |
326 | } | |
327 | ||
500fe141 SO |
328 | /* Set engine mode and create appropriate sysfs attributes, if required. */ |
329 | static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode) | |
330 | { | |
500fe141 SO |
331 | int ret = 0; |
332 | ||
333 | /* if in that mode already do nothing, except for run */ | |
334 | if (mode == engine->mode && mode != LP5521_CMD_RUN) | |
335 | return 0; | |
336 | ||
337 | if (mode == LP5521_CMD_RUN) { | |
338 | ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN); | |
339 | } else if (mode == LP5521_CMD_LOAD) { | |
340 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
341 | lp5521_set_engine_mode(engine, LP5521_CMD_LOAD); | |
500fe141 SO |
342 | } else if (mode == LP5521_CMD_DISABLED) { |
343 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
344 | } | |
345 | ||
500fe141 SO |
346 | engine->mode = mode; |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
351 | static int lp5521_do_store_load(struct lp5521_engine *engine, | |
352 | const char *buf, size_t len) | |
353 | { | |
354 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
355 | struct i2c_client *client = chip->client; | |
356 | int ret, nrchars, offset = 0, i = 0; | |
357 | char c[3]; | |
358 | unsigned cmd; | |
359 | u8 pattern[LP5521_PROGRAM_LENGTH] = {0}; | |
360 | ||
361 | while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) { | |
362 | /* separate sscanfs because length is working only for %s */ | |
363 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); | |
2260209c VK |
364 | if (ret != 2) |
365 | goto fail; | |
500fe141 SO |
366 | ret = sscanf(c, "%2x", &cmd); |
367 | if (ret != 1) | |
368 | goto fail; | |
369 | pattern[i] = (u8)cmd; | |
370 | ||
371 | offset += nrchars; | |
372 | i++; | |
373 | } | |
374 | ||
375 | /* Each instruction is 16bit long. Check that length is even */ | |
376 | if (i % 2) | |
377 | goto fail; | |
378 | ||
379 | mutex_lock(&chip->lock); | |
d4e7ad03 SO |
380 | if (engine->mode == LP5521_CMD_LOAD) |
381 | ret = lp5521_load_program(engine, pattern); | |
382 | else | |
383 | ret = -EINVAL; | |
500fe141 SO |
384 | mutex_unlock(&chip->lock); |
385 | ||
386 | if (ret) { | |
387 | dev_err(&client->dev, "failed loading pattern\n"); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | return len; | |
392 | fail: | |
393 | dev_err(&client->dev, "wrong pattern format\n"); | |
394 | return -EINVAL; | |
395 | } | |
396 | ||
397 | static ssize_t store_engine_load(struct device *dev, | |
398 | struct device_attribute *attr, | |
399 | const char *buf, size_t len, int nr) | |
400 | { | |
401 | struct i2c_client *client = to_i2c_client(dev); | |
402 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
403 | return lp5521_do_store_load(&chip->engines[nr - 1], buf, len); | |
404 | } | |
405 | ||
406 | #define store_load(nr) \ | |
407 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
408 | struct device_attribute *attr, \ | |
409 | const char *buf, size_t len) \ | |
410 | { \ | |
411 | return store_engine_load(dev, attr, buf, len, nr); \ | |
412 | } | |
413 | store_load(1) | |
414 | store_load(2) | |
415 | store_load(3) | |
416 | ||
417 | static ssize_t show_engine_mode(struct device *dev, | |
418 | struct device_attribute *attr, | |
419 | char *buf, int nr) | |
420 | { | |
421 | struct i2c_client *client = to_i2c_client(dev); | |
422 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
423 | switch (chip->engines[nr - 1].mode) { | |
424 | case LP5521_CMD_RUN: | |
425 | return sprintf(buf, "run\n"); | |
426 | case LP5521_CMD_LOAD: | |
427 | return sprintf(buf, "load\n"); | |
428 | case LP5521_CMD_DISABLED: | |
429 | return sprintf(buf, "disabled\n"); | |
430 | default: | |
431 | return sprintf(buf, "disabled\n"); | |
432 | } | |
433 | } | |
434 | ||
435 | #define show_mode(nr) \ | |
436 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
437 | struct device_attribute *attr, \ | |
438 | char *buf) \ | |
439 | { \ | |
440 | return show_engine_mode(dev, attr, buf, nr); \ | |
441 | } | |
442 | show_mode(1) | |
443 | show_mode(2) | |
444 | show_mode(3) | |
445 | ||
446 | static ssize_t store_engine_mode(struct device *dev, | |
447 | struct device_attribute *attr, | |
448 | const char *buf, size_t len, int nr) | |
449 | { | |
450 | struct i2c_client *client = to_i2c_client(dev); | |
451 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
452 | struct lp5521_engine *engine = &chip->engines[nr - 1]; | |
453 | mutex_lock(&chip->lock); | |
454 | ||
455 | if (!strncmp(buf, "run", 3)) | |
456 | lp5521_set_mode(engine, LP5521_CMD_RUN); | |
457 | else if (!strncmp(buf, "load", 4)) | |
458 | lp5521_set_mode(engine, LP5521_CMD_LOAD); | |
459 | else if (!strncmp(buf, "disabled", 8)) | |
460 | lp5521_set_mode(engine, LP5521_CMD_DISABLED); | |
461 | ||
462 | mutex_unlock(&chip->lock); | |
463 | return len; | |
464 | } | |
465 | ||
466 | #define store_mode(nr) \ | |
467 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
468 | struct device_attribute *attr, \ | |
469 | const char *buf, size_t len) \ | |
470 | { \ | |
471 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
472 | } | |
473 | store_mode(1) | |
474 | store_mode(2) | |
475 | store_mode(3) | |
476 | ||
477 | static ssize_t show_max_current(struct device *dev, | |
478 | struct device_attribute *attr, | |
479 | char *buf) | |
480 | { | |
481 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
482 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
483 | ||
484 | return sprintf(buf, "%d\n", led->max_current); | |
485 | } | |
486 | ||
487 | static ssize_t show_current(struct device *dev, | |
488 | struct device_attribute *attr, | |
489 | char *buf) | |
490 | { | |
491 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
492 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
493 | ||
494 | return sprintf(buf, "%d\n", led->led_current); | |
495 | } | |
496 | ||
497 | static ssize_t store_current(struct device *dev, | |
498 | struct device_attribute *attr, | |
499 | const char *buf, size_t len) | |
500 | { | |
501 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
502 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
503 | struct lp5521_chip *chip = led_to_lp5521(led); | |
504 | ssize_t ret; | |
505 | unsigned long curr; | |
506 | ||
011af7bc | 507 | if (kstrtoul(buf, 0, &curr)) |
500fe141 SO |
508 | return -EINVAL; |
509 | ||
510 | if (curr > led->max_current) | |
511 | return -EINVAL; | |
512 | ||
513 | mutex_lock(&chip->lock); | |
514 | ret = lp5521_set_led_current(chip, led->id, curr); | |
515 | mutex_unlock(&chip->lock); | |
516 | ||
517 | if (ret < 0) | |
518 | return ret; | |
519 | ||
520 | led->led_current = (u8)curr; | |
521 | ||
522 | return len; | |
523 | } | |
524 | ||
525 | static ssize_t lp5521_selftest(struct device *dev, | |
526 | struct device_attribute *attr, | |
527 | char *buf) | |
528 | { | |
529 | struct i2c_client *client = to_i2c_client(dev); | |
530 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
531 | int ret; | |
532 | ||
533 | mutex_lock(&chip->lock); | |
534 | ret = lp5521_run_selftest(chip, buf); | |
535 | mutex_unlock(&chip->lock); | |
536 | return sprintf(buf, "%s\n", ret ? "FAIL" : "OK"); | |
537 | } | |
538 | ||
011af7bc KM |
539 | static void lp5521_clear_program_memory(struct i2c_client *cl) |
540 | { | |
541 | int i; | |
542 | u8 rgb_mem[] = { | |
543 | LP5521_REG_R_PROG_MEM, | |
544 | LP5521_REG_G_PROG_MEM, | |
545 | LP5521_REG_B_PROG_MEM, | |
546 | }; | |
547 | ||
548 | for (i = 0; i < ARRAY_SIZE(rgb_mem); i++) { | |
549 | lp5521_write(cl, rgb_mem[i], 0); | |
550 | lp5521_write(cl, rgb_mem[i] + 1, 0); | |
551 | } | |
552 | } | |
553 | ||
554 | static void lp5521_write_program_memory(struct i2c_client *cl, | |
555 | u8 base, u8 *rgb, int size) | |
556 | { | |
557 | int i; | |
558 | ||
559 | if (!rgb || size <= 0) | |
560 | return; | |
561 | ||
562 | for (i = 0; i < size; i++) | |
563 | lp5521_write(cl, base + i, *(rgb + i)); | |
564 | ||
565 | lp5521_write(cl, base + i, 0); | |
566 | lp5521_write(cl, base + i + 1, 0); | |
567 | } | |
568 | ||
569 | static inline struct lp5521_led_pattern *lp5521_get_pattern | |
570 | (struct lp5521_chip *chip, u8 offset) | |
571 | { | |
572 | struct lp5521_led_pattern *ptn; | |
573 | ptn = chip->pdata->patterns + (offset - 1); | |
574 | return ptn; | |
575 | } | |
576 | ||
577 | static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip) | |
578 | { | |
579 | struct lp5521_led_pattern *ptn; | |
580 | struct i2c_client *cl = chip->client; | |
581 | int num_patterns = chip->pdata->num_patterns; | |
582 | ||
583 | if (mode > num_patterns || !(chip->pdata->patterns)) | |
584 | return; | |
585 | ||
586 | if (mode == PATTERN_OFF) { | |
32a2f747 | 587 | lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT); |
011af7bc KM |
588 | usleep_range(1000, 2000); |
589 | lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); | |
590 | } else { | |
591 | ptn = lp5521_get_pattern(chip, mode); | |
592 | if (!ptn) | |
593 | return; | |
594 | ||
595 | lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_LOAD); | |
596 | usleep_range(1000, 2000); | |
597 | ||
598 | lp5521_clear_program_memory(cl); | |
599 | ||
600 | lp5521_write_program_memory(cl, LP5521_REG_R_PROG_MEM, | |
601 | ptn->r, ptn->size_r); | |
602 | lp5521_write_program_memory(cl, LP5521_REG_G_PROG_MEM, | |
603 | ptn->g, ptn->size_g); | |
604 | lp5521_write_program_memory(cl, LP5521_REG_B_PROG_MEM, | |
605 | ptn->b, ptn->size_b); | |
606 | ||
607 | lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN); | |
608 | usleep_range(1000, 2000); | |
32a2f747 | 609 | lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM); |
011af7bc KM |
610 | } |
611 | } | |
612 | ||
613 | static ssize_t store_led_pattern(struct device *dev, | |
614 | struct device_attribute *attr, | |
615 | const char *buf, size_t len) | |
616 | { | |
617 | struct lp5521_chip *chip = i2c_get_clientdata(to_i2c_client(dev)); | |
618 | unsigned long val; | |
619 | int ret; | |
620 | ||
69b44c16 | 621 | ret = kstrtoul(buf, 16, &val); |
011af7bc KM |
622 | if (ret) |
623 | return ret; | |
624 | ||
625 | lp5521_run_led_pattern(val, chip); | |
626 | ||
627 | return len; | |
628 | } | |
629 | ||
500fe141 | 630 | /* led class device attributes */ |
67d1da79 | 631 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); |
500fe141 SO |
632 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); |
633 | ||
634 | static struct attribute *lp5521_led_attributes[] = { | |
635 | &dev_attr_led_current.attr, | |
636 | &dev_attr_max_current.attr, | |
637 | NULL, | |
638 | }; | |
639 | ||
640 | static struct attribute_group lp5521_led_attribute_group = { | |
641 | .attrs = lp5521_led_attributes | |
642 | }; | |
643 | ||
644 | /* device attributes */ | |
67d1da79 | 645 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, |
500fe141 | 646 | show_engine1_mode, store_engine1_mode); |
67d1da79 | 647 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, |
500fe141 | 648 | show_engine2_mode, store_engine2_mode); |
67d1da79 | 649 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, |
500fe141 | 650 | show_engine3_mode, store_engine3_mode); |
67d1da79 VK |
651 | static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); |
652 | static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); | |
653 | static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); | |
500fe141 | 654 | static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL); |
011af7bc | 655 | static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, store_led_pattern); |
500fe141 SO |
656 | |
657 | static struct attribute *lp5521_attributes[] = { | |
658 | &dev_attr_engine1_mode.attr, | |
659 | &dev_attr_engine2_mode.attr, | |
660 | &dev_attr_engine3_mode.attr, | |
661 | &dev_attr_selftest.attr, | |
500fe141 | 662 | &dev_attr_engine1_load.attr, |
500fe141 | 663 | &dev_attr_engine2_load.attr, |
500fe141 | 664 | &dev_attr_engine3_load.attr, |
011af7bc | 665 | &dev_attr_led_pattern.attr, |
500fe141 SO |
666 | NULL |
667 | }; | |
668 | ||
669 | static const struct attribute_group lp5521_group = { | |
670 | .attrs = lp5521_attributes, | |
671 | }; | |
672 | ||
500fe141 SO |
673 | static int lp5521_register_sysfs(struct i2c_client *client) |
674 | { | |
675 | struct device *dev = &client->dev; | |
676 | return sysfs_create_group(&dev->kobj, &lp5521_group); | |
677 | } | |
678 | ||
679 | static void lp5521_unregister_sysfs(struct i2c_client *client) | |
680 | { | |
681 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
682 | struct device *dev = &client->dev; | |
683 | int i; | |
684 | ||
685 | sysfs_remove_group(&dev->kobj, &lp5521_group); | |
686 | ||
500fe141 SO |
687 | for (i = 0; i < chip->num_leds; i++) |
688 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
689 | &lp5521_led_attribute_group); | |
690 | } | |
691 | ||
1904f83d MWK |
692 | static void lp5521_unregister_leds(struct lp5521_chip *chip) |
693 | { | |
694 | int i; | |
695 | ||
696 | for (i = 0; i < chip->num_leds; i++) { | |
697 | led_classdev_unregister(&chip->leds[i].cdev); | |
698 | cancel_work_sync(&chip->leds[i].brightness_work); | |
699 | } | |
700 | } | |
701 | ||
48068d5d MWK |
702 | /* Chip specific configurations */ |
703 | static struct lp55xx_device_config lp5521_cfg = { | |
704 | .reset = { | |
705 | .addr = LP5521_REG_RESET, | |
706 | .val = LP5521_RESET, | |
707 | }, | |
e3a700d8 MWK |
708 | .enable = { |
709 | .addr = LP5521_REG_ENABLE, | |
710 | .val = LP5521_ENABLE_DEFAULT, | |
711 | }, | |
0e202346 | 712 | .max_channel = LP5521_MAX_LEDS, |
ffbdccdb | 713 | .post_init_device = lp5521_post_init_device, |
48068d5d MWK |
714 | }; |
715 | ||
98ea1ea2 | 716 | static int lp5521_probe(struct i2c_client *client, |
500fe141 SO |
717 | const struct i2c_device_id *id) |
718 | { | |
6a0c9a47 | 719 | struct lp5521_chip *old_chip = NULL; |
1904f83d | 720 | int ret; |
6a0c9a47 MWK |
721 | struct lp55xx_chip *chip; |
722 | struct lp55xx_led *led; | |
723 | struct lp55xx_platform_data *pdata = client->dev.platform_data; | |
500fe141 | 724 | |
6a0c9a47 | 725 | if (!pdata) { |
500fe141 | 726 | dev_err(&client->dev, "no platform data\n"); |
e430dc00 | 727 | return -EINVAL; |
500fe141 SO |
728 | } |
729 | ||
6a0c9a47 MWK |
730 | chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); |
731 | if (!chip) | |
732 | return -ENOMEM; | |
733 | ||
734 | led = devm_kzalloc(&client->dev, | |
735 | sizeof(*led) * pdata->num_channels, GFP_KERNEL); | |
736 | if (!led) | |
737 | return -ENOMEM; | |
738 | ||
739 | chip->cl = client; | |
740 | chip->pdata = pdata; | |
48068d5d | 741 | chip->cfg = &lp5521_cfg; |
6a0c9a47 MWK |
742 | |
743 | mutex_init(&chip->lock); | |
500fe141 | 744 | |
6a0c9a47 | 745 | i2c_set_clientdata(client, led); |
500fe141 | 746 | |
22ebeb48 | 747 | ret = lp55xx_init_device(chip); |
944f7b1d | 748 | if (ret) |
f6c64c6f | 749 | goto err_init; |
500fe141 SO |
750 | |
751 | dev_info(&client->dev, "%s programmable led chip found\n", id->name); | |
752 | ||
9e9b3db1 | 753 | ret = lp55xx_register_leds(led, chip); |
f6524808 | 754 | if (ret) |
9e9b3db1 | 755 | goto err_register_leds; |
500fe141 SO |
756 | |
757 | ret = lp5521_register_sysfs(client); | |
758 | if (ret) { | |
759 | dev_err(&client->dev, "registering sysfs failed\n"); | |
e430dc00 | 760 | goto fail2; |
500fe141 SO |
761 | } |
762 | return ret; | |
e430dc00 | 763 | fail2: |
945c7007 | 764 | lp5521_unregister_leds(old_chip); |
9e9b3db1 | 765 | err_register_leds: |
6ce61762 | 766 | lp55xx_deinit_device(chip); |
f6c64c6f | 767 | err_init: |
500fe141 SO |
768 | return ret; |
769 | } | |
770 | ||
678e8a6b | 771 | static int lp5521_remove(struct i2c_client *client) |
500fe141 | 772 | { |
945c7007 | 773 | struct lp5521_chip *old_chip = i2c_get_clientdata(client); |
6ce61762 MWK |
774 | struct lp55xx_led *led = i2c_get_clientdata(client); |
775 | struct lp55xx_chip *chip = led->chip; | |
500fe141 | 776 | |
945c7007 | 777 | lp5521_run_led_pattern(PATTERN_OFF, old_chip); |
500fe141 SO |
778 | lp5521_unregister_sysfs(client); |
779 | ||
945c7007 | 780 | lp5521_unregister_leds(old_chip); |
6ce61762 | 781 | lp55xx_deinit_device(chip); |
500fe141 | 782 | |
500fe141 SO |
783 | return 0; |
784 | } | |
785 | ||
786 | static const struct i2c_device_id lp5521_id[] = { | |
787 | { "lp5521", 0 }, /* Three channel chip */ | |
788 | { } | |
789 | }; | |
790 | MODULE_DEVICE_TABLE(i2c, lp5521_id); | |
791 | ||
792 | static struct i2c_driver lp5521_driver = { | |
793 | .driver = { | |
794 | .name = "lp5521", | |
795 | }, | |
796 | .probe = lp5521_probe, | |
df07cf81 | 797 | .remove = lp5521_remove, |
500fe141 SO |
798 | .id_table = lp5521_id, |
799 | }; | |
800 | ||
09a0d183 | 801 | module_i2c_driver(lp5521_driver); |
500fe141 SO |
802 | |
803 | MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo"); | |
804 | MODULE_DESCRIPTION("LP5521 LED engine"); | |
805 | MODULE_LICENSE("GPL v2"); |