Commit | Line | Data |
---|---|---|
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); | |
09c76b0f SO |
199 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
200 | usleep_range(1000, 2000); | |
500fe141 SO |
201 | ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode); |
202 | ||
203 | /* For loading, all the engines to load mode */ | |
204 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); | |
09c76b0f SO |
205 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
206 | usleep_range(1000, 2000); | |
500fe141 | 207 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD); |
09c76b0f SO |
208 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
209 | usleep_range(1000, 2000); | |
500fe141 SO |
210 | |
211 | addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE; | |
212 | i2c_smbus_write_i2c_block_data(client, | |
213 | addr, | |
214 | LP5521_PROG_MEM_SIZE, | |
215 | pattern); | |
216 | ||
217 | ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr) | |
222 | { | |
223 | return lp5521_write(chip->client, | |
224 | LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
225 | curr); | |
226 | } | |
227 | ||
228 | static void lp5521_init_engine(struct lp5521_chip *chip, | |
229 | const struct attribute_group *attr_group) | |
230 | { | |
231 | int i; | |
232 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
233 | chip->engines[i].id = i + 1; | |
234 | chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2); | |
235 | chip->engines[i].prog_page = i; | |
236 | chip->engines[i].attributes = &attr_group[i]; | |
237 | } | |
238 | } | |
239 | ||
240 | static int lp5521_configure(struct i2c_client *client, | |
241 | const struct attribute_group *attr_group) | |
242 | { | |
243 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
244 | int ret; | |
245 | ||
246 | lp5521_init_engine(chip, attr_group); | |
247 | ||
500fe141 SO |
248 | /* Set all PWMs to direct control mode */ |
249 | ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F); | |
250 | ||
251 | /* Enable auto-powersave, set charge pump to auto, red to battery */ | |
252 | ret |= lp5521_write(client, LP5521_REG_CONFIG, | |
253 | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT); | |
254 | ||
255 | /* Initialize all channels PWM to zero -> leds off */ | |
256 | ret |= lp5521_write(client, LP5521_REG_R_PWM, 0); | |
257 | ret |= lp5521_write(client, LP5521_REG_G_PWM, 0); | |
258 | ret |= lp5521_write(client, LP5521_REG_B_PWM, 0); | |
259 | ||
260 | /* Set engines are set to run state when OP_MODE enables engines */ | |
261 | ret |= lp5521_write(client, LP5521_REG_ENABLE, | |
262 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM | | |
263 | LP5521_EXEC_RUN); | |
09c76b0f SO |
264 | /* enable takes 500us. 1 - 2 ms leaves some margin */ |
265 | usleep_range(1000, 2000); | |
500fe141 SO |
266 | |
267 | return ret; | |
268 | } | |
269 | ||
270 | static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf) | |
271 | { | |
272 | int ret; | |
273 | u8 status; | |
274 | ||
275 | ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status); | |
276 | if (ret < 0) | |
277 | return ret; | |
278 | ||
279 | /* Check that ext clock is really in use if requested */ | |
280 | if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT) | |
281 | if ((status & LP5521_EXT_CLK_USED) == 0) | |
282 | return -EIO; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static void lp5521_set_brightness(struct led_classdev *cdev, | |
287 | enum led_brightness brightness) | |
288 | { | |
289 | struct lp5521_led *led = cdev_to_led(cdev); | |
290 | led->brightness = (u8)brightness; | |
291 | schedule_work(&led->brightness_work); | |
292 | } | |
293 | ||
294 | static void lp5521_led_brightness_work(struct work_struct *work) | |
295 | { | |
296 | struct lp5521_led *led = container_of(work, | |
297 | struct lp5521_led, | |
298 | brightness_work); | |
299 | struct lp5521_chip *chip = led_to_lp5521(led); | |
300 | struct i2c_client *client = chip->client; | |
301 | ||
302 | mutex_lock(&chip->lock); | |
303 | lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr, | |
304 | led->brightness); | |
305 | mutex_unlock(&chip->lock); | |
306 | } | |
307 | ||
308 | /* Detect the chip by setting its ENABLE register and reading it back. */ | |
309 | static int lp5521_detect(struct i2c_client *client) | |
310 | { | |
311 | int ret; | |
312 | u8 buf; | |
313 | ||
314 | ret = lp5521_write(client, LP5521_REG_ENABLE, | |
315 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM); | |
316 | if (ret) | |
317 | return ret; | |
09c76b0f SO |
318 | /* enable takes 500us. 1 - 2 ms leaves some margin */ |
319 | usleep_range(1000, 2000); | |
500fe141 SO |
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); | |
2260209c VK |
376 | if (ret != 2) |
377 | goto fail; | |
500fe141 SO |
378 | ret = sscanf(c, "%2x", &cmd); |
379 | if (ret != 1) | |
380 | goto fail; | |
381 | pattern[i] = (u8)cmd; | |
382 | ||
383 | offset += nrchars; | |
384 | i++; | |
385 | } | |
386 | ||
387 | /* Each instruction is 16bit long. Check that length is even */ | |
388 | if (i % 2) | |
389 | goto fail; | |
390 | ||
391 | mutex_lock(&chip->lock); | |
392 | ret = lp5521_load_program(engine, pattern); | |
393 | mutex_unlock(&chip->lock); | |
394 | ||
395 | if (ret) { | |
396 | dev_err(&client->dev, "failed loading pattern\n"); | |
397 | return ret; | |
398 | } | |
399 | ||
400 | return len; | |
401 | fail: | |
402 | dev_err(&client->dev, "wrong pattern format\n"); | |
403 | return -EINVAL; | |
404 | } | |
405 | ||
406 | static ssize_t store_engine_load(struct device *dev, | |
407 | struct device_attribute *attr, | |
408 | const char *buf, size_t len, int nr) | |
409 | { | |
410 | struct i2c_client *client = to_i2c_client(dev); | |
411 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
412 | return lp5521_do_store_load(&chip->engines[nr - 1], buf, len); | |
413 | } | |
414 | ||
415 | #define store_load(nr) \ | |
416 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
417 | struct device_attribute *attr, \ | |
418 | const char *buf, size_t len) \ | |
419 | { \ | |
420 | return store_engine_load(dev, attr, buf, len, nr); \ | |
421 | } | |
422 | store_load(1) | |
423 | store_load(2) | |
424 | store_load(3) | |
425 | ||
426 | static ssize_t show_engine_mode(struct device *dev, | |
427 | struct device_attribute *attr, | |
428 | char *buf, int nr) | |
429 | { | |
430 | struct i2c_client *client = to_i2c_client(dev); | |
431 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
432 | switch (chip->engines[nr - 1].mode) { | |
433 | case LP5521_CMD_RUN: | |
434 | return sprintf(buf, "run\n"); | |
435 | case LP5521_CMD_LOAD: | |
436 | return sprintf(buf, "load\n"); | |
437 | case LP5521_CMD_DISABLED: | |
438 | return sprintf(buf, "disabled\n"); | |
439 | default: | |
440 | return sprintf(buf, "disabled\n"); | |
441 | } | |
442 | } | |
443 | ||
444 | #define show_mode(nr) \ | |
445 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
446 | struct device_attribute *attr, \ | |
447 | char *buf) \ | |
448 | { \ | |
449 | return show_engine_mode(dev, attr, buf, nr); \ | |
450 | } | |
451 | show_mode(1) | |
452 | show_mode(2) | |
453 | show_mode(3) | |
454 | ||
455 | static ssize_t store_engine_mode(struct device *dev, | |
456 | struct device_attribute *attr, | |
457 | const char *buf, size_t len, int nr) | |
458 | { | |
459 | struct i2c_client *client = to_i2c_client(dev); | |
460 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
461 | struct lp5521_engine *engine = &chip->engines[nr - 1]; | |
462 | mutex_lock(&chip->lock); | |
463 | ||
464 | if (!strncmp(buf, "run", 3)) | |
465 | lp5521_set_mode(engine, LP5521_CMD_RUN); | |
466 | else if (!strncmp(buf, "load", 4)) | |
467 | lp5521_set_mode(engine, LP5521_CMD_LOAD); | |
468 | else if (!strncmp(buf, "disabled", 8)) | |
469 | lp5521_set_mode(engine, LP5521_CMD_DISABLED); | |
470 | ||
471 | mutex_unlock(&chip->lock); | |
472 | return len; | |
473 | } | |
474 | ||
475 | #define store_mode(nr) \ | |
476 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
477 | struct device_attribute *attr, \ | |
478 | const char *buf, size_t len) \ | |
479 | { \ | |
480 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
481 | } | |
482 | store_mode(1) | |
483 | store_mode(2) | |
484 | store_mode(3) | |
485 | ||
486 | static ssize_t show_max_current(struct device *dev, | |
487 | struct device_attribute *attr, | |
488 | char *buf) | |
489 | { | |
490 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
491 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
492 | ||
493 | return sprintf(buf, "%d\n", led->max_current); | |
494 | } | |
495 | ||
496 | static ssize_t show_current(struct device *dev, | |
497 | struct device_attribute *attr, | |
498 | char *buf) | |
499 | { | |
500 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
501 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
502 | ||
503 | return sprintf(buf, "%d\n", led->led_current); | |
504 | } | |
505 | ||
506 | static ssize_t store_current(struct device *dev, | |
507 | struct device_attribute *attr, | |
508 | const char *buf, size_t len) | |
509 | { | |
510 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
511 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
512 | struct lp5521_chip *chip = led_to_lp5521(led); | |
513 | ssize_t ret; | |
514 | unsigned long curr; | |
515 | ||
516 | if (strict_strtoul(buf, 0, &curr)) | |
517 | return -EINVAL; | |
518 | ||
519 | if (curr > led->max_current) | |
520 | return -EINVAL; | |
521 | ||
522 | mutex_lock(&chip->lock); | |
523 | ret = lp5521_set_led_current(chip, led->id, curr); | |
524 | mutex_unlock(&chip->lock); | |
525 | ||
526 | if (ret < 0) | |
527 | return ret; | |
528 | ||
529 | led->led_current = (u8)curr; | |
530 | ||
531 | return len; | |
532 | } | |
533 | ||
534 | static ssize_t lp5521_selftest(struct device *dev, | |
535 | struct device_attribute *attr, | |
536 | char *buf) | |
537 | { | |
538 | struct i2c_client *client = to_i2c_client(dev); | |
539 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
540 | int ret; | |
541 | ||
542 | mutex_lock(&chip->lock); | |
543 | ret = lp5521_run_selftest(chip, buf); | |
544 | mutex_unlock(&chip->lock); | |
545 | return sprintf(buf, "%s\n", ret ? "FAIL" : "OK"); | |
546 | } | |
547 | ||
548 | /* led class device attributes */ | |
549 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current); | |
550 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); | |
551 | ||
552 | static struct attribute *lp5521_led_attributes[] = { | |
553 | &dev_attr_led_current.attr, | |
554 | &dev_attr_max_current.attr, | |
555 | NULL, | |
556 | }; | |
557 | ||
558 | static struct attribute_group lp5521_led_attribute_group = { | |
559 | .attrs = lp5521_led_attributes | |
560 | }; | |
561 | ||
562 | /* device attributes */ | |
563 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO, | |
564 | show_engine1_mode, store_engine1_mode); | |
565 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO, | |
566 | show_engine2_mode, store_engine2_mode); | |
567 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO, | |
568 | show_engine3_mode, store_engine3_mode); | |
569 | static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load); | |
570 | static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load); | |
571 | static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load); | |
572 | static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL); | |
573 | ||
574 | static struct attribute *lp5521_attributes[] = { | |
575 | &dev_attr_engine1_mode.attr, | |
576 | &dev_attr_engine2_mode.attr, | |
577 | &dev_attr_engine3_mode.attr, | |
578 | &dev_attr_selftest.attr, | |
579 | NULL | |
580 | }; | |
581 | ||
582 | static struct attribute *lp5521_engine1_attributes[] = { | |
583 | &dev_attr_engine1_load.attr, | |
584 | NULL | |
585 | }; | |
586 | ||
587 | static struct attribute *lp5521_engine2_attributes[] = { | |
588 | &dev_attr_engine2_load.attr, | |
589 | NULL | |
590 | }; | |
591 | ||
592 | static struct attribute *lp5521_engine3_attributes[] = { | |
593 | &dev_attr_engine3_load.attr, | |
594 | NULL | |
595 | }; | |
596 | ||
597 | static const struct attribute_group lp5521_group = { | |
598 | .attrs = lp5521_attributes, | |
599 | }; | |
600 | ||
601 | static const struct attribute_group lp5521_engine_group[] = { | |
602 | {.attrs = lp5521_engine1_attributes }, | |
603 | {.attrs = lp5521_engine2_attributes }, | |
604 | {.attrs = lp5521_engine3_attributes }, | |
605 | }; | |
606 | ||
607 | static int lp5521_register_sysfs(struct i2c_client *client) | |
608 | { | |
609 | struct device *dev = &client->dev; | |
610 | return sysfs_create_group(&dev->kobj, &lp5521_group); | |
611 | } | |
612 | ||
613 | static void lp5521_unregister_sysfs(struct i2c_client *client) | |
614 | { | |
615 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
616 | struct device *dev = &client->dev; | |
617 | int i; | |
618 | ||
619 | sysfs_remove_group(&dev->kobj, &lp5521_group); | |
620 | ||
621 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
622 | if (chip->engines[i].mode == LP5521_CMD_LOAD) | |
623 | sysfs_remove_group(&dev->kobj, | |
624 | chip->engines[i].attributes); | |
625 | } | |
626 | ||
627 | for (i = 0; i < chip->num_leds; i++) | |
628 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
629 | &lp5521_led_attribute_group); | |
630 | } | |
631 | ||
632 | static int __init lp5521_init_led(struct lp5521_led *led, | |
633 | struct i2c_client *client, | |
634 | int chan, struct lp5521_platform_data *pdata) | |
635 | { | |
636 | struct device *dev = &client->dev; | |
637 | char name[32]; | |
638 | int res; | |
639 | ||
640 | if (chan >= LP5521_MAX_LEDS) | |
641 | return -EINVAL; | |
642 | ||
643 | if (pdata->led_config[chan].led_current == 0) | |
644 | return 0; | |
645 | ||
646 | led->led_current = pdata->led_config[chan].led_current; | |
647 | led->max_current = pdata->led_config[chan].max_current; | |
648 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
649 | ||
650 | if (led->chan_nr >= LP5521_MAX_LEDS) { | |
651 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
652 | LP5521_MAX_LEDS - 1); | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
656 | snprintf(name, sizeof(name), "%s:channel%d", client->name, chan); | |
657 | led->cdev.brightness_set = lp5521_set_brightness; | |
658 | led->cdev.name = name; | |
659 | res = led_classdev_register(dev, &led->cdev); | |
660 | if (res < 0) { | |
661 | dev_err(dev, "couldn't register led on channel %d\n", chan); | |
662 | return res; | |
663 | } | |
664 | ||
665 | res = sysfs_create_group(&led->cdev.dev->kobj, | |
666 | &lp5521_led_attribute_group); | |
667 | if (res < 0) { | |
668 | dev_err(dev, "couldn't register current attribute\n"); | |
669 | led_classdev_unregister(&led->cdev); | |
670 | return res; | |
671 | } | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static int lp5521_probe(struct i2c_client *client, | |
676 | const struct i2c_device_id *id) | |
677 | { | |
678 | struct lp5521_chip *chip; | |
679 | struct lp5521_platform_data *pdata; | |
680 | int ret, i, led; | |
681 | ||
682 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
683 | if (!chip) | |
684 | return -ENOMEM; | |
685 | ||
686 | i2c_set_clientdata(client, chip); | |
687 | chip->client = client; | |
688 | ||
689 | pdata = client->dev.platform_data; | |
690 | ||
691 | if (!pdata) { | |
692 | dev_err(&client->dev, "no platform data\n"); | |
693 | ret = -EINVAL; | |
694 | goto fail1; | |
695 | } | |
696 | ||
697 | mutex_init(&chip->lock); | |
698 | ||
699 | chip->pdata = pdata; | |
700 | ||
701 | if (pdata->setup_resources) { | |
702 | ret = pdata->setup_resources(); | |
703 | if (ret < 0) | |
704 | goto fail1; | |
705 | } | |
706 | ||
707 | if (pdata->enable) { | |
708 | pdata->enable(0); | |
09c76b0f | 709 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
500fe141 | 710 | pdata->enable(1); |
09c76b0f | 711 | usleep_range(1000, 2000); /* 500us abs min. */ |
500fe141 SO |
712 | } |
713 | ||
95ea8eec SO |
714 | lp5521_write(client, LP5521_REG_RESET, 0xff); |
715 | usleep_range(10000, 20000); /* | |
716 | * Exact value is not available. 10 - 20ms | |
717 | * appears to be enough for reset. | |
718 | */ | |
500fe141 SO |
719 | ret = lp5521_detect(client); |
720 | ||
721 | if (ret) { | |
722 | dev_err(&client->dev, "Chip not found\n"); | |
723 | goto fail2; | |
724 | } | |
725 | ||
726 | dev_info(&client->dev, "%s programmable led chip found\n", id->name); | |
727 | ||
728 | ret = lp5521_configure(client, lp5521_engine_group); | |
729 | if (ret < 0) { | |
730 | dev_err(&client->dev, "error configuring chip\n"); | |
731 | goto fail2; | |
732 | } | |
733 | ||
734 | /* Initialize leds */ | |
735 | chip->num_channels = pdata->num_channels; | |
736 | chip->num_leds = 0; | |
737 | led = 0; | |
738 | for (i = 0; i < pdata->num_channels; i++) { | |
739 | /* Do not initialize channels that are not connected */ | |
740 | if (pdata->led_config[i].led_current == 0) | |
741 | continue; | |
742 | ||
743 | ret = lp5521_init_led(&chip->leds[led], client, i, pdata); | |
744 | if (ret) { | |
745 | dev_err(&client->dev, "error initializing leds\n"); | |
746 | goto fail3; | |
747 | } | |
748 | chip->num_leds++; | |
749 | ||
750 | chip->leds[led].id = led; | |
751 | /* Set initial LED current */ | |
752 | lp5521_set_led_current(chip, led, | |
753 | chip->leds[led].led_current); | |
754 | ||
755 | INIT_WORK(&(chip->leds[led].brightness_work), | |
756 | lp5521_led_brightness_work); | |
757 | ||
758 | led++; | |
759 | } | |
760 | ||
761 | ret = lp5521_register_sysfs(client); | |
762 | if (ret) { | |
763 | dev_err(&client->dev, "registering sysfs failed\n"); | |
764 | goto fail3; | |
765 | } | |
766 | return ret; | |
767 | fail3: | |
768 | for (i = 0; i < chip->num_leds; i++) { | |
769 | led_classdev_unregister(&chip->leds[i].cdev); | |
770 | cancel_work_sync(&chip->leds[i].brightness_work); | |
771 | } | |
772 | fail2: | |
773 | if (pdata->enable) | |
774 | pdata->enable(0); | |
775 | if (pdata->release_resources) | |
776 | pdata->release_resources(); | |
777 | fail1: | |
778 | kfree(chip); | |
779 | return ret; | |
780 | } | |
781 | ||
782 | static int lp5521_remove(struct i2c_client *client) | |
783 | { | |
784 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
785 | int i; | |
786 | ||
787 | lp5521_unregister_sysfs(client); | |
788 | ||
789 | for (i = 0; i < chip->num_leds; i++) { | |
790 | led_classdev_unregister(&chip->leds[i].cdev); | |
791 | cancel_work_sync(&chip->leds[i].brightness_work); | |
792 | } | |
793 | ||
794 | if (chip->pdata->enable) | |
795 | chip->pdata->enable(0); | |
796 | if (chip->pdata->release_resources) | |
797 | chip->pdata->release_resources(); | |
798 | kfree(chip); | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static const struct i2c_device_id lp5521_id[] = { | |
803 | { "lp5521", 0 }, /* Three channel chip */ | |
804 | { } | |
805 | }; | |
806 | MODULE_DEVICE_TABLE(i2c, lp5521_id); | |
807 | ||
808 | static struct i2c_driver lp5521_driver = { | |
809 | .driver = { | |
810 | .name = "lp5521", | |
811 | }, | |
812 | .probe = lp5521_probe, | |
813 | .remove = lp5521_remove, | |
814 | .id_table = lp5521_id, | |
815 | }; | |
816 | ||
817 | static int __init lp5521_init(void) | |
818 | { | |
819 | int ret; | |
820 | ||
821 | ret = i2c_add_driver(&lp5521_driver); | |
822 | ||
823 | if (ret < 0) | |
824 | printk(KERN_ALERT "Adding lp5521 driver failed\n"); | |
825 | ||
826 | return ret; | |
827 | } | |
828 | ||
829 | static void __exit lp5521_exit(void) | |
830 | { | |
831 | i2c_del_driver(&lp5521_driver); | |
832 | } | |
833 | ||
834 | module_init(lp5521_init); | |
835 | module_exit(lp5521_exit); | |
836 | ||
837 | MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo"); | |
838 | MODULE_DESCRIPTION("LP5521 LED engine"); | |
839 | MODULE_LICENSE("GPL v2"); |