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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> | |
37 | ||
38 | #define LP5521_PROGRAM_LENGTH 32 /* in bytes */ | |
39 | ||
40 | #define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */ | |
41 | #define LP5521_MAX_ENGINES 3 /* Maximum number of engines */ | |
42 | ||
43 | #define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */ | |
44 | #define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */ | |
45 | ||
46 | #define LP5521_CMD_LOAD 0x15 /* 00010101 */ | |
47 | #define LP5521_CMD_RUN 0x2a /* 00101010 */ | |
48 | #define LP5521_CMD_DIRECT 0x3f /* 00111111 */ | |
49 | #define LP5521_CMD_DISABLED 0x00 /* 00000000 */ | |
50 | ||
51 | /* Registers */ | |
52 | #define LP5521_REG_ENABLE 0x00 | |
53 | #define LP5521_REG_OP_MODE 0x01 | |
54 | #define LP5521_REG_R_PWM 0x02 | |
55 | #define LP5521_REG_G_PWM 0x03 | |
56 | #define LP5521_REG_B_PWM 0x04 | |
57 | #define LP5521_REG_R_CURRENT 0x05 | |
58 | #define LP5521_REG_G_CURRENT 0x06 | |
59 | #define LP5521_REG_B_CURRENT 0x07 | |
60 | #define LP5521_REG_CONFIG 0x08 | |
61 | #define LP5521_REG_R_CHANNEL_PC 0x09 | |
62 | #define LP5521_REG_G_CHANNEL_PC 0x0A | |
63 | #define LP5521_REG_B_CHANNEL_PC 0x0B | |
64 | #define LP5521_REG_STATUS 0x0C | |
65 | #define LP5521_REG_RESET 0x0D | |
66 | #define LP5521_REG_GPO 0x0E | |
67 | #define LP5521_REG_R_PROG_MEM 0x10 | |
68 | #define LP5521_REG_G_PROG_MEM 0x30 | |
69 | #define LP5521_REG_B_PROG_MEM 0x50 | |
70 | ||
71 | #define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM | |
72 | #define LP5521_PROG_MEM_SIZE 0x20 | |
73 | ||
74 | /* Base register to set LED current */ | |
75 | #define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT | |
76 | ||
77 | /* Base register to set the brightness */ | |
78 | #define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM | |
79 | ||
80 | /* Bits in ENABLE register */ | |
81 | #define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */ | |
82 | #define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */ | |
83 | #define LP5521_EXEC_RUN 0x2A | |
84 | ||
85 | /* Bits in CONFIG register */ | |
86 | #define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */ | |
87 | #define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */ | |
88 | #define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */ | |
89 | #define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */ | |
90 | #define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */ | |
91 | #define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */ | |
92 | #define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */ | |
93 | #define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */ | |
94 | #define LP5521_CLK_INT 1 /* Internal clock */ | |
95 | #define LP5521_CLK_AUTO 2 /* Automatic clock selection */ | |
96 | ||
97 | /* Status */ | |
98 | #define LP5521_EXT_CLK_USED 0x08 | |
99 | ||
100 | struct lp5521_engine { | |
101 | const struct attribute_group *attributes; | |
102 | int id; | |
103 | u8 mode; | |
104 | u8 prog_page; | |
105 | u8 engine_mask; | |
106 | }; | |
107 | ||
108 | struct lp5521_led { | |
109 | int id; | |
110 | u8 chan_nr; | |
111 | u8 led_current; | |
112 | u8 max_current; | |
113 | struct led_classdev cdev; | |
114 | struct work_struct brightness_work; | |
115 | u8 brightness; | |
116 | }; | |
117 | ||
118 | struct lp5521_chip { | |
119 | struct lp5521_platform_data *pdata; | |
120 | struct mutex lock; /* Serialize control */ | |
121 | struct i2c_client *client; | |
122 | struct lp5521_engine engines[LP5521_MAX_ENGINES]; | |
123 | struct lp5521_led leds[LP5521_MAX_LEDS]; | |
124 | u8 num_channels; | |
125 | u8 num_leds; | |
126 | }; | |
127 | ||
9fdb18b6 SO |
128 | static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev) |
129 | { | |
130 | return container_of(cdev, struct lp5521_led, cdev); | |
131 | } | |
132 | ||
133 | static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine) | |
134 | { | |
135 | return container_of(engine, struct lp5521_chip, | |
136 | engines[engine->id - 1]); | |
137 | } | |
138 | ||
139 | static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led) | |
140 | { | |
141 | return container_of(led, struct lp5521_chip, | |
142 | leds[led->id]); | |
143 | } | |
500fe141 SO |
144 | |
145 | static void lp5521_led_brightness_work(struct work_struct *work); | |
146 | ||
147 | static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value) | |
148 | { | |
149 | return i2c_smbus_write_byte_data(client, reg, value); | |
150 | } | |
151 | ||
152 | static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf) | |
153 | { | |
154 | s32 ret; | |
155 | ||
156 | ret = i2c_smbus_read_byte_data(client, reg); | |
157 | if (ret < 0) | |
158 | return -EIO; | |
159 | ||
160 | *buf = ret; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode) | |
165 | { | |
166 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
167 | struct i2c_client *client = chip->client; | |
168 | int ret; | |
169 | u8 engine_state; | |
170 | ||
171 | /* Only transition between RUN and DIRECT mode are handled here */ | |
172 | if (mode == LP5521_CMD_LOAD) | |
173 | return 0; | |
174 | ||
175 | if (mode == LP5521_CMD_DISABLED) | |
176 | mode = LP5521_CMD_DIRECT; | |
177 | ||
178 | ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state); | |
179 | ||
180 | /* set mode only for this engine */ | |
181 | engine_state &= ~(engine->engine_mask); | |
182 | mode &= engine->engine_mask; | |
183 | engine_state |= mode; | |
184 | ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state); | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern) | |
190 | { | |
191 | struct lp5521_chip *chip = engine_to_lp5521(eng); | |
192 | struct i2c_client *client = chip->client; | |
193 | int ret; | |
194 | int addr; | |
195 | u8 mode; | |
196 | ||
197 | /* move current engine to direct mode and remember the state */ | |
198 | ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT); | |
199 | usleep_range(1000, 10000); | |
200 | ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode); | |
201 | ||
202 | /* For loading, all the engines to load mode */ | |
203 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); | |
204 | usleep_range(1000, 10000); | |
205 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD); | |
206 | usleep_range(1000, 10000); | |
207 | ||
208 | addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE; | |
209 | i2c_smbus_write_i2c_block_data(client, | |
210 | addr, | |
211 | LP5521_PROG_MEM_SIZE, | |
212 | pattern); | |
213 | ||
214 | ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode); | |
215 | return ret; | |
216 | } | |
217 | ||
218 | static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr) | |
219 | { | |
220 | return lp5521_write(chip->client, | |
221 | LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
222 | curr); | |
223 | } | |
224 | ||
225 | static void lp5521_init_engine(struct lp5521_chip *chip, | |
226 | const struct attribute_group *attr_group) | |
227 | { | |
228 | int i; | |
229 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
230 | chip->engines[i].id = i + 1; | |
231 | chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2); | |
232 | chip->engines[i].prog_page = i; | |
233 | chip->engines[i].attributes = &attr_group[i]; | |
234 | } | |
235 | } | |
236 | ||
237 | static int lp5521_configure(struct i2c_client *client, | |
238 | const struct attribute_group *attr_group) | |
239 | { | |
240 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
241 | int ret; | |
242 | ||
243 | lp5521_init_engine(chip, attr_group); | |
244 | ||
245 | lp5521_write(client, LP5521_REG_RESET, 0xff); | |
246 | ||
247 | usleep_range(10000, 20000); | |
248 | ||
249 | /* Set all PWMs to direct control mode */ | |
250 | ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F); | |
251 | ||
252 | /* Enable auto-powersave, set charge pump to auto, red to battery */ | |
253 | ret |= lp5521_write(client, LP5521_REG_CONFIG, | |
254 | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT); | |
255 | ||
256 | /* Initialize all channels PWM to zero -> leds off */ | |
257 | ret |= lp5521_write(client, LP5521_REG_R_PWM, 0); | |
258 | ret |= lp5521_write(client, LP5521_REG_G_PWM, 0); | |
259 | ret |= lp5521_write(client, LP5521_REG_B_PWM, 0); | |
260 | ||
261 | /* Set engines are set to run state when OP_MODE enables engines */ | |
262 | ret |= lp5521_write(client, LP5521_REG_ENABLE, | |
263 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM | | |
264 | LP5521_EXEC_RUN); | |
265 | /* enable takes 500us */ | |
266 | usleep_range(500, 20000); | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
271 | static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf) | |
272 | { | |
273 | int ret; | |
274 | u8 status; | |
275 | ||
276 | ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status); | |
277 | if (ret < 0) | |
278 | return ret; | |
279 | ||
280 | /* Check that ext clock is really in use if requested */ | |
281 | if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT) | |
282 | if ((status & LP5521_EXT_CLK_USED) == 0) | |
283 | return -EIO; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static void lp5521_set_brightness(struct led_classdev *cdev, | |
288 | enum led_brightness brightness) | |
289 | { | |
290 | struct lp5521_led *led = cdev_to_led(cdev); | |
291 | led->brightness = (u8)brightness; | |
292 | schedule_work(&led->brightness_work); | |
293 | } | |
294 | ||
295 | static void lp5521_led_brightness_work(struct work_struct *work) | |
296 | { | |
297 | struct lp5521_led *led = container_of(work, | |
298 | struct lp5521_led, | |
299 | brightness_work); | |
300 | struct lp5521_chip *chip = led_to_lp5521(led); | |
301 | struct i2c_client *client = chip->client; | |
302 | ||
303 | mutex_lock(&chip->lock); | |
304 | lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr, | |
305 | led->brightness); | |
306 | mutex_unlock(&chip->lock); | |
307 | } | |
308 | ||
309 | /* Detect the chip by setting its ENABLE register and reading it back. */ | |
310 | static int lp5521_detect(struct i2c_client *client) | |
311 | { | |
312 | int ret; | |
313 | u8 buf; | |
314 | ||
315 | ret = lp5521_write(client, LP5521_REG_ENABLE, | |
316 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM); | |
317 | if (ret) | |
318 | return ret; | |
319 | usleep_range(1000, 10000); | |
320 | ret = lp5521_read(client, LP5521_REG_ENABLE, &buf); | |
321 | if (ret) | |
322 | return ret; | |
323 | if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)) | |
324 | return -ENODEV; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | /* Set engine mode and create appropriate sysfs attributes, if required. */ | |
330 | static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode) | |
331 | { | |
332 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
333 | struct i2c_client *client = chip->client; | |
334 | struct device *dev = &client->dev; | |
335 | int ret = 0; | |
336 | ||
337 | /* if in that mode already do nothing, except for run */ | |
338 | if (mode == engine->mode && mode != LP5521_CMD_RUN) | |
339 | return 0; | |
340 | ||
341 | if (mode == LP5521_CMD_RUN) { | |
342 | ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN); | |
343 | } else if (mode == LP5521_CMD_LOAD) { | |
344 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
345 | lp5521_set_engine_mode(engine, LP5521_CMD_LOAD); | |
346 | ||
347 | ret = sysfs_create_group(&dev->kobj, engine->attributes); | |
348 | if (ret) | |
349 | return ret; | |
350 | } else if (mode == LP5521_CMD_DISABLED) { | |
351 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
352 | } | |
353 | ||
354 | /* remove load attribute from sysfs if not in load mode */ | |
355 | if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD) | |
356 | sysfs_remove_group(&dev->kobj, engine->attributes); | |
357 | ||
358 | engine->mode = mode; | |
359 | ||
360 | return ret; | |
361 | } | |
362 | ||
363 | static int lp5521_do_store_load(struct lp5521_engine *engine, | |
364 | const char *buf, size_t len) | |
365 | { | |
366 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
367 | struct i2c_client *client = chip->client; | |
368 | int ret, nrchars, offset = 0, i = 0; | |
369 | char c[3]; | |
370 | unsigned cmd; | |
371 | u8 pattern[LP5521_PROGRAM_LENGTH] = {0}; | |
372 | ||
373 | while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) { | |
374 | /* separate sscanfs because length is working only for %s */ | |
375 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); | |
376 | ret = sscanf(c, "%2x", &cmd); | |
377 | if (ret != 1) | |
378 | goto fail; | |
379 | pattern[i] = (u8)cmd; | |
380 | ||
381 | offset += nrchars; | |
382 | i++; | |
383 | } | |
384 | ||
385 | /* Each instruction is 16bit long. Check that length is even */ | |
386 | if (i % 2) | |
387 | goto fail; | |
388 | ||
389 | mutex_lock(&chip->lock); | |
390 | ret = lp5521_load_program(engine, pattern); | |
391 | mutex_unlock(&chip->lock); | |
392 | ||
393 | if (ret) { | |
394 | dev_err(&client->dev, "failed loading pattern\n"); | |
395 | return ret; | |
396 | } | |
397 | ||
398 | return len; | |
399 | fail: | |
400 | dev_err(&client->dev, "wrong pattern format\n"); | |
401 | return -EINVAL; | |
402 | } | |
403 | ||
404 | static ssize_t store_engine_load(struct device *dev, | |
405 | struct device_attribute *attr, | |
406 | const char *buf, size_t len, int nr) | |
407 | { | |
408 | struct i2c_client *client = to_i2c_client(dev); | |
409 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
410 | return lp5521_do_store_load(&chip->engines[nr - 1], buf, len); | |
411 | } | |
412 | ||
413 | #define store_load(nr) \ | |
414 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
415 | struct device_attribute *attr, \ | |
416 | const char *buf, size_t len) \ | |
417 | { \ | |
418 | return store_engine_load(dev, attr, buf, len, nr); \ | |
419 | } | |
420 | store_load(1) | |
421 | store_load(2) | |
422 | store_load(3) | |
423 | ||
424 | static ssize_t show_engine_mode(struct device *dev, | |
425 | struct device_attribute *attr, | |
426 | char *buf, int nr) | |
427 | { | |
428 | struct i2c_client *client = to_i2c_client(dev); | |
429 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
430 | switch (chip->engines[nr - 1].mode) { | |
431 | case LP5521_CMD_RUN: | |
432 | return sprintf(buf, "run\n"); | |
433 | case LP5521_CMD_LOAD: | |
434 | return sprintf(buf, "load\n"); | |
435 | case LP5521_CMD_DISABLED: | |
436 | return sprintf(buf, "disabled\n"); | |
437 | default: | |
438 | return sprintf(buf, "disabled\n"); | |
439 | } | |
440 | } | |
441 | ||
442 | #define show_mode(nr) \ | |
443 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
444 | struct device_attribute *attr, \ | |
445 | char *buf) \ | |
446 | { \ | |
447 | return show_engine_mode(dev, attr, buf, nr); \ | |
448 | } | |
449 | show_mode(1) | |
450 | show_mode(2) | |
451 | show_mode(3) | |
452 | ||
453 | static ssize_t store_engine_mode(struct device *dev, | |
454 | struct device_attribute *attr, | |
455 | const char *buf, size_t len, int nr) | |
456 | { | |
457 | struct i2c_client *client = to_i2c_client(dev); | |
458 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
459 | struct lp5521_engine *engine = &chip->engines[nr - 1]; | |
460 | mutex_lock(&chip->lock); | |
461 | ||
462 | if (!strncmp(buf, "run", 3)) | |
463 | lp5521_set_mode(engine, LP5521_CMD_RUN); | |
464 | else if (!strncmp(buf, "load", 4)) | |
465 | lp5521_set_mode(engine, LP5521_CMD_LOAD); | |
466 | else if (!strncmp(buf, "disabled", 8)) | |
467 | lp5521_set_mode(engine, LP5521_CMD_DISABLED); | |
468 | ||
469 | mutex_unlock(&chip->lock); | |
470 | return len; | |
471 | } | |
472 | ||
473 | #define store_mode(nr) \ | |
474 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
475 | struct device_attribute *attr, \ | |
476 | const char *buf, size_t len) \ | |
477 | { \ | |
478 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
479 | } | |
480 | store_mode(1) | |
481 | store_mode(2) | |
482 | store_mode(3) | |
483 | ||
484 | static ssize_t show_max_current(struct device *dev, | |
485 | struct device_attribute *attr, | |
486 | char *buf) | |
487 | { | |
488 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
489 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
490 | ||
491 | return sprintf(buf, "%d\n", led->max_current); | |
492 | } | |
493 | ||
494 | static ssize_t show_current(struct device *dev, | |
495 | struct device_attribute *attr, | |
496 | char *buf) | |
497 | { | |
498 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
499 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
500 | ||
501 | return sprintf(buf, "%d\n", led->led_current); | |
502 | } | |
503 | ||
504 | static ssize_t store_current(struct device *dev, | |
505 | struct device_attribute *attr, | |
506 | const char *buf, size_t len) | |
507 | { | |
508 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
509 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
510 | struct lp5521_chip *chip = led_to_lp5521(led); | |
511 | ssize_t ret; | |
512 | unsigned long curr; | |
513 | ||
514 | if (strict_strtoul(buf, 0, &curr)) | |
515 | return -EINVAL; | |
516 | ||
517 | if (curr > led->max_current) | |
518 | return -EINVAL; | |
519 | ||
520 | mutex_lock(&chip->lock); | |
521 | ret = lp5521_set_led_current(chip, led->id, curr); | |
522 | mutex_unlock(&chip->lock); | |
523 | ||
524 | if (ret < 0) | |
525 | return ret; | |
526 | ||
527 | led->led_current = (u8)curr; | |
528 | ||
529 | return len; | |
530 | } | |
531 | ||
532 | static ssize_t lp5521_selftest(struct device *dev, | |
533 | struct device_attribute *attr, | |
534 | char *buf) | |
535 | { | |
536 | struct i2c_client *client = to_i2c_client(dev); | |
537 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
538 | int ret; | |
539 | ||
540 | mutex_lock(&chip->lock); | |
541 | ret = lp5521_run_selftest(chip, buf); | |
542 | mutex_unlock(&chip->lock); | |
543 | return sprintf(buf, "%s\n", ret ? "FAIL" : "OK"); | |
544 | } | |
545 | ||
546 | /* led class device attributes */ | |
547 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current); | |
548 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); | |
549 | ||
550 | static struct attribute *lp5521_led_attributes[] = { | |
551 | &dev_attr_led_current.attr, | |
552 | &dev_attr_max_current.attr, | |
553 | NULL, | |
554 | }; | |
555 | ||
556 | static struct attribute_group lp5521_led_attribute_group = { | |
557 | .attrs = lp5521_led_attributes | |
558 | }; | |
559 | ||
560 | /* device attributes */ | |
561 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO, | |
562 | show_engine1_mode, store_engine1_mode); | |
563 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO, | |
564 | show_engine2_mode, store_engine2_mode); | |
565 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO, | |
566 | show_engine3_mode, store_engine3_mode); | |
567 | static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load); | |
568 | static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load); | |
569 | static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load); | |
570 | static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL); | |
571 | ||
572 | static struct attribute *lp5521_attributes[] = { | |
573 | &dev_attr_engine1_mode.attr, | |
574 | &dev_attr_engine2_mode.attr, | |
575 | &dev_attr_engine3_mode.attr, | |
576 | &dev_attr_selftest.attr, | |
577 | NULL | |
578 | }; | |
579 | ||
580 | static struct attribute *lp5521_engine1_attributes[] = { | |
581 | &dev_attr_engine1_load.attr, | |
582 | NULL | |
583 | }; | |
584 | ||
585 | static struct attribute *lp5521_engine2_attributes[] = { | |
586 | &dev_attr_engine2_load.attr, | |
587 | NULL | |
588 | }; | |
589 | ||
590 | static struct attribute *lp5521_engine3_attributes[] = { | |
591 | &dev_attr_engine3_load.attr, | |
592 | NULL | |
593 | }; | |
594 | ||
595 | static const struct attribute_group lp5521_group = { | |
596 | .attrs = lp5521_attributes, | |
597 | }; | |
598 | ||
599 | static const struct attribute_group lp5521_engine_group[] = { | |
600 | {.attrs = lp5521_engine1_attributes }, | |
601 | {.attrs = lp5521_engine2_attributes }, | |
602 | {.attrs = lp5521_engine3_attributes }, | |
603 | }; | |
604 | ||
605 | static int lp5521_register_sysfs(struct i2c_client *client) | |
606 | { | |
607 | struct device *dev = &client->dev; | |
608 | return sysfs_create_group(&dev->kobj, &lp5521_group); | |
609 | } | |
610 | ||
611 | static void lp5521_unregister_sysfs(struct i2c_client *client) | |
612 | { | |
613 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
614 | struct device *dev = &client->dev; | |
615 | int i; | |
616 | ||
617 | sysfs_remove_group(&dev->kobj, &lp5521_group); | |
618 | ||
619 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
620 | if (chip->engines[i].mode == LP5521_CMD_LOAD) | |
621 | sysfs_remove_group(&dev->kobj, | |
622 | chip->engines[i].attributes); | |
623 | } | |
624 | ||
625 | for (i = 0; i < chip->num_leds; i++) | |
626 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
627 | &lp5521_led_attribute_group); | |
628 | } | |
629 | ||
630 | static int __init lp5521_init_led(struct lp5521_led *led, | |
631 | struct i2c_client *client, | |
632 | int chan, struct lp5521_platform_data *pdata) | |
633 | { | |
634 | struct device *dev = &client->dev; | |
635 | char name[32]; | |
636 | int res; | |
637 | ||
638 | if (chan >= LP5521_MAX_LEDS) | |
639 | return -EINVAL; | |
640 | ||
641 | if (pdata->led_config[chan].led_current == 0) | |
642 | return 0; | |
643 | ||
644 | led->led_current = pdata->led_config[chan].led_current; | |
645 | led->max_current = pdata->led_config[chan].max_current; | |
646 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
647 | ||
648 | if (led->chan_nr >= LP5521_MAX_LEDS) { | |
649 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
650 | LP5521_MAX_LEDS - 1); | |
651 | return -EINVAL; | |
652 | } | |
653 | ||
654 | snprintf(name, sizeof(name), "%s:channel%d", client->name, chan); | |
655 | led->cdev.brightness_set = lp5521_set_brightness; | |
656 | led->cdev.name = name; | |
657 | res = led_classdev_register(dev, &led->cdev); | |
658 | if (res < 0) { | |
659 | dev_err(dev, "couldn't register led on channel %d\n", chan); | |
660 | return res; | |
661 | } | |
662 | ||
663 | res = sysfs_create_group(&led->cdev.dev->kobj, | |
664 | &lp5521_led_attribute_group); | |
665 | if (res < 0) { | |
666 | dev_err(dev, "couldn't register current attribute\n"); | |
667 | led_classdev_unregister(&led->cdev); | |
668 | return res; | |
669 | } | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int lp5521_probe(struct i2c_client *client, | |
674 | const struct i2c_device_id *id) | |
675 | { | |
676 | struct lp5521_chip *chip; | |
677 | struct lp5521_platform_data *pdata; | |
678 | int ret, i, led; | |
679 | ||
680 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
681 | if (!chip) | |
682 | return -ENOMEM; | |
683 | ||
684 | i2c_set_clientdata(client, chip); | |
685 | chip->client = client; | |
686 | ||
687 | pdata = client->dev.platform_data; | |
688 | ||
689 | if (!pdata) { | |
690 | dev_err(&client->dev, "no platform data\n"); | |
691 | ret = -EINVAL; | |
692 | goto fail1; | |
693 | } | |
694 | ||
695 | mutex_init(&chip->lock); | |
696 | ||
697 | chip->pdata = pdata; | |
698 | ||
699 | if (pdata->setup_resources) { | |
700 | ret = pdata->setup_resources(); | |
701 | if (ret < 0) | |
702 | goto fail1; | |
703 | } | |
704 | ||
705 | if (pdata->enable) { | |
706 | pdata->enable(0); | |
707 | usleep_range(1000, 10000); | |
708 | pdata->enable(1); | |
709 | usleep_range(1000, 10000); /* Spec says min 500us */ | |
710 | } | |
711 | ||
712 | ret = lp5521_detect(client); | |
713 | ||
714 | if (ret) { | |
715 | dev_err(&client->dev, "Chip not found\n"); | |
716 | goto fail2; | |
717 | } | |
718 | ||
719 | dev_info(&client->dev, "%s programmable led chip found\n", id->name); | |
720 | ||
721 | ret = lp5521_configure(client, lp5521_engine_group); | |
722 | if (ret < 0) { | |
723 | dev_err(&client->dev, "error configuring chip\n"); | |
724 | goto fail2; | |
725 | } | |
726 | ||
727 | /* Initialize leds */ | |
728 | chip->num_channels = pdata->num_channels; | |
729 | chip->num_leds = 0; | |
730 | led = 0; | |
731 | for (i = 0; i < pdata->num_channels; i++) { | |
732 | /* Do not initialize channels that are not connected */ | |
733 | if (pdata->led_config[i].led_current == 0) | |
734 | continue; | |
735 | ||
736 | ret = lp5521_init_led(&chip->leds[led], client, i, pdata); | |
737 | if (ret) { | |
738 | dev_err(&client->dev, "error initializing leds\n"); | |
739 | goto fail3; | |
740 | } | |
741 | chip->num_leds++; | |
742 | ||
743 | chip->leds[led].id = led; | |
744 | /* Set initial LED current */ | |
745 | lp5521_set_led_current(chip, led, | |
746 | chip->leds[led].led_current); | |
747 | ||
748 | INIT_WORK(&(chip->leds[led].brightness_work), | |
749 | lp5521_led_brightness_work); | |
750 | ||
751 | led++; | |
752 | } | |
753 | ||
754 | ret = lp5521_register_sysfs(client); | |
755 | if (ret) { | |
756 | dev_err(&client->dev, "registering sysfs failed\n"); | |
757 | goto fail3; | |
758 | } | |
759 | return ret; | |
760 | fail3: | |
761 | for (i = 0; i < chip->num_leds; i++) { | |
762 | led_classdev_unregister(&chip->leds[i].cdev); | |
763 | cancel_work_sync(&chip->leds[i].brightness_work); | |
764 | } | |
765 | fail2: | |
766 | if (pdata->enable) | |
767 | pdata->enable(0); | |
768 | if (pdata->release_resources) | |
769 | pdata->release_resources(); | |
770 | fail1: | |
771 | kfree(chip); | |
772 | return ret; | |
773 | } | |
774 | ||
775 | static int lp5521_remove(struct i2c_client *client) | |
776 | { | |
777 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
778 | int i; | |
779 | ||
780 | lp5521_unregister_sysfs(client); | |
781 | ||
782 | for (i = 0; i < chip->num_leds; i++) { | |
783 | led_classdev_unregister(&chip->leds[i].cdev); | |
784 | cancel_work_sync(&chip->leds[i].brightness_work); | |
785 | } | |
786 | ||
787 | if (chip->pdata->enable) | |
788 | chip->pdata->enable(0); | |
789 | if (chip->pdata->release_resources) | |
790 | chip->pdata->release_resources(); | |
791 | kfree(chip); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static const struct i2c_device_id lp5521_id[] = { | |
796 | { "lp5521", 0 }, /* Three channel chip */ | |
797 | { } | |
798 | }; | |
799 | MODULE_DEVICE_TABLE(i2c, lp5521_id); | |
800 | ||
801 | static struct i2c_driver lp5521_driver = { | |
802 | .driver = { | |
803 | .name = "lp5521", | |
804 | }, | |
805 | .probe = lp5521_probe, | |
806 | .remove = lp5521_remove, | |
807 | .id_table = lp5521_id, | |
808 | }; | |
809 | ||
810 | static int __init lp5521_init(void) | |
811 | { | |
812 | int ret; | |
813 | ||
814 | ret = i2c_add_driver(&lp5521_driver); | |
815 | ||
816 | if (ret < 0) | |
817 | printk(KERN_ALERT "Adding lp5521 driver failed\n"); | |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
822 | static void __exit lp5521_exit(void) | |
823 | { | |
824 | i2c_del_driver(&lp5521_driver); | |
825 | } | |
826 | ||
827 | module_init(lp5521_init); | |
828 | module_exit(lp5521_exit); | |
829 | ||
830 | MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo"); | |
831 | MODULE_DESCRIPTION("LP5521 LED engine"); | |
832 | MODULE_LICENSE("GPL v2"); |