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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 { | |
500fe141 SO |
101 | int id; |
102 | u8 mode; | |
103 | u8 prog_page; | |
104 | u8 engine_mask; | |
105 | }; | |
106 | ||
107 | struct lp5521_led { | |
108 | int id; | |
109 | u8 chan_nr; | |
110 | u8 led_current; | |
111 | u8 max_current; | |
112 | struct led_classdev cdev; | |
113 | struct work_struct brightness_work; | |
114 | u8 brightness; | |
115 | }; | |
116 | ||
117 | struct lp5521_chip { | |
118 | struct lp5521_platform_data *pdata; | |
119 | struct mutex lock; /* Serialize control */ | |
120 | struct i2c_client *client; | |
121 | struct lp5521_engine engines[LP5521_MAX_ENGINES]; | |
122 | struct lp5521_led leds[LP5521_MAX_LEDS]; | |
123 | u8 num_channels; | |
124 | u8 num_leds; | |
125 | }; | |
126 | ||
9fdb18b6 SO |
127 | static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev) |
128 | { | |
129 | return container_of(cdev, struct lp5521_led, cdev); | |
130 | } | |
131 | ||
132 | static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine) | |
133 | { | |
134 | return container_of(engine, struct lp5521_chip, | |
135 | engines[engine->id - 1]); | |
136 | } | |
137 | ||
138 | static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led) | |
139 | { | |
140 | return container_of(led, struct lp5521_chip, | |
141 | leds[led->id]); | |
142 | } | |
500fe141 SO |
143 | |
144 | static void lp5521_led_brightness_work(struct work_struct *work); | |
145 | ||
146 | static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value) | |
147 | { | |
148 | return i2c_smbus_write_byte_data(client, reg, value); | |
149 | } | |
150 | ||
151 | static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf) | |
152 | { | |
153 | s32 ret; | |
154 | ||
155 | ret = i2c_smbus_read_byte_data(client, reg); | |
156 | if (ret < 0) | |
157 | return -EIO; | |
158 | ||
159 | *buf = ret; | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode) | |
164 | { | |
165 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
166 | struct i2c_client *client = chip->client; | |
167 | int ret; | |
168 | u8 engine_state; | |
169 | ||
170 | /* Only transition between RUN and DIRECT mode are handled here */ | |
171 | if (mode == LP5521_CMD_LOAD) | |
172 | return 0; | |
173 | ||
174 | if (mode == LP5521_CMD_DISABLED) | |
175 | mode = LP5521_CMD_DIRECT; | |
176 | ||
177 | ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state); | |
178 | ||
179 | /* set mode only for this engine */ | |
180 | engine_state &= ~(engine->engine_mask); | |
181 | mode &= engine->engine_mask; | |
182 | engine_state |= mode; | |
183 | ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state); | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
188 | static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern) | |
189 | { | |
190 | struct lp5521_chip *chip = engine_to_lp5521(eng); | |
191 | struct i2c_client *client = chip->client; | |
192 | int ret; | |
193 | int addr; | |
194 | u8 mode; | |
195 | ||
196 | /* move current engine to direct mode and remember the state */ | |
197 | ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT); | |
09c76b0f SO |
198 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
199 | usleep_range(1000, 2000); | |
500fe141 SO |
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); | |
09c76b0f SO |
204 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
205 | usleep_range(1000, 2000); | |
500fe141 | 206 | lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD); |
09c76b0f SO |
207 | /* Mode change requires min 500 us delay. 1 - 2 ms with margin */ |
208 | usleep_range(1000, 2000); | |
500fe141 SO |
209 | |
210 | addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE; | |
211 | i2c_smbus_write_i2c_block_data(client, | |
212 | addr, | |
213 | LP5521_PROG_MEM_SIZE, | |
214 | pattern); | |
215 | ||
216 | ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr) | |
221 | { | |
222 | return lp5521_write(chip->client, | |
223 | LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
224 | curr); | |
225 | } | |
226 | ||
d4e7ad03 | 227 | static void lp5521_init_engine(struct lp5521_chip *chip) |
500fe141 SO |
228 | { |
229 | int i; | |
230 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
231 | chip->engines[i].id = i + 1; | |
232 | chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2); | |
233 | chip->engines[i].prog_page = i; | |
500fe141 SO |
234 | } |
235 | } | |
236 | ||
d4e7ad03 | 237 | static int lp5521_configure(struct i2c_client *client) |
500fe141 SO |
238 | { |
239 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
240 | int ret; | |
241 | ||
d4e7ad03 | 242 | lp5521_init_engine(chip); |
500fe141 | 243 | |
500fe141 SO |
244 | /* Set all PWMs to direct control mode */ |
245 | ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F); | |
246 | ||
247 | /* Enable auto-powersave, set charge pump to auto, red to battery */ | |
248 | ret |= lp5521_write(client, LP5521_REG_CONFIG, | |
249 | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT); | |
250 | ||
251 | /* Initialize all channels PWM to zero -> leds off */ | |
252 | ret |= lp5521_write(client, LP5521_REG_R_PWM, 0); | |
253 | ret |= lp5521_write(client, LP5521_REG_G_PWM, 0); | |
254 | ret |= lp5521_write(client, LP5521_REG_B_PWM, 0); | |
255 | ||
256 | /* Set engines are set to run state when OP_MODE enables engines */ | |
257 | ret |= lp5521_write(client, LP5521_REG_ENABLE, | |
258 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM | | |
259 | LP5521_EXEC_RUN); | |
09c76b0f SO |
260 | /* enable takes 500us. 1 - 2 ms leaves some margin */ |
261 | usleep_range(1000, 2000); | |
500fe141 SO |
262 | |
263 | return ret; | |
264 | } | |
265 | ||
266 | static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf) | |
267 | { | |
268 | int ret; | |
269 | u8 status; | |
270 | ||
271 | ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status); | |
272 | if (ret < 0) | |
273 | return ret; | |
274 | ||
275 | /* Check that ext clock is really in use if requested */ | |
276 | if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT) | |
277 | if ((status & LP5521_EXT_CLK_USED) == 0) | |
278 | return -EIO; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static void lp5521_set_brightness(struct led_classdev *cdev, | |
283 | enum led_brightness brightness) | |
284 | { | |
285 | struct lp5521_led *led = cdev_to_led(cdev); | |
286 | led->brightness = (u8)brightness; | |
287 | schedule_work(&led->brightness_work); | |
288 | } | |
289 | ||
290 | static void lp5521_led_brightness_work(struct work_struct *work) | |
291 | { | |
292 | struct lp5521_led *led = container_of(work, | |
293 | struct lp5521_led, | |
294 | brightness_work); | |
295 | struct lp5521_chip *chip = led_to_lp5521(led); | |
296 | struct i2c_client *client = chip->client; | |
297 | ||
298 | mutex_lock(&chip->lock); | |
299 | lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr, | |
300 | led->brightness); | |
301 | mutex_unlock(&chip->lock); | |
302 | } | |
303 | ||
304 | /* Detect the chip by setting its ENABLE register and reading it back. */ | |
305 | static int lp5521_detect(struct i2c_client *client) | |
306 | { | |
307 | int ret; | |
308 | u8 buf; | |
309 | ||
310 | ret = lp5521_write(client, LP5521_REG_ENABLE, | |
311 | LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM); | |
312 | if (ret) | |
313 | return ret; | |
09c76b0f SO |
314 | /* enable takes 500us. 1 - 2 ms leaves some margin */ |
315 | usleep_range(1000, 2000); | |
500fe141 SO |
316 | ret = lp5521_read(client, LP5521_REG_ENABLE, &buf); |
317 | if (ret) | |
318 | return ret; | |
319 | if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)) | |
320 | return -ENODEV; | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | /* Set engine mode and create appropriate sysfs attributes, if required. */ | |
326 | static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode) | |
327 | { | |
500fe141 SO |
328 | int ret = 0; |
329 | ||
330 | /* if in that mode already do nothing, except for run */ | |
331 | if (mode == engine->mode && mode != LP5521_CMD_RUN) | |
332 | return 0; | |
333 | ||
334 | if (mode == LP5521_CMD_RUN) { | |
335 | ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN); | |
336 | } else if (mode == LP5521_CMD_LOAD) { | |
337 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
338 | lp5521_set_engine_mode(engine, LP5521_CMD_LOAD); | |
500fe141 SO |
339 | } else if (mode == LP5521_CMD_DISABLED) { |
340 | lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED); | |
341 | } | |
342 | ||
500fe141 SO |
343 | engine->mode = mode; |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | static int lp5521_do_store_load(struct lp5521_engine *engine, | |
349 | const char *buf, size_t len) | |
350 | { | |
351 | struct lp5521_chip *chip = engine_to_lp5521(engine); | |
352 | struct i2c_client *client = chip->client; | |
353 | int ret, nrchars, offset = 0, i = 0; | |
354 | char c[3]; | |
355 | unsigned cmd; | |
356 | u8 pattern[LP5521_PROGRAM_LENGTH] = {0}; | |
357 | ||
358 | while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) { | |
359 | /* separate sscanfs because length is working only for %s */ | |
360 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); | |
2260209c VK |
361 | if (ret != 2) |
362 | goto fail; | |
500fe141 SO |
363 | ret = sscanf(c, "%2x", &cmd); |
364 | if (ret != 1) | |
365 | goto fail; | |
366 | pattern[i] = (u8)cmd; | |
367 | ||
368 | offset += nrchars; | |
369 | i++; | |
370 | } | |
371 | ||
372 | /* Each instruction is 16bit long. Check that length is even */ | |
373 | if (i % 2) | |
374 | goto fail; | |
375 | ||
376 | mutex_lock(&chip->lock); | |
d4e7ad03 SO |
377 | if (engine->mode == LP5521_CMD_LOAD) |
378 | ret = lp5521_load_program(engine, pattern); | |
379 | else | |
380 | ret = -EINVAL; | |
500fe141 SO |
381 | mutex_unlock(&chip->lock); |
382 | ||
383 | if (ret) { | |
384 | dev_err(&client->dev, "failed loading pattern\n"); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | return len; | |
389 | fail: | |
390 | dev_err(&client->dev, "wrong pattern format\n"); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | static ssize_t store_engine_load(struct device *dev, | |
395 | struct device_attribute *attr, | |
396 | const char *buf, size_t len, int nr) | |
397 | { | |
398 | struct i2c_client *client = to_i2c_client(dev); | |
399 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
400 | return lp5521_do_store_load(&chip->engines[nr - 1], buf, len); | |
401 | } | |
402 | ||
403 | #define store_load(nr) \ | |
404 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
405 | struct device_attribute *attr, \ | |
406 | const char *buf, size_t len) \ | |
407 | { \ | |
408 | return store_engine_load(dev, attr, buf, len, nr); \ | |
409 | } | |
410 | store_load(1) | |
411 | store_load(2) | |
412 | store_load(3) | |
413 | ||
414 | static ssize_t show_engine_mode(struct device *dev, | |
415 | struct device_attribute *attr, | |
416 | char *buf, int nr) | |
417 | { | |
418 | struct i2c_client *client = to_i2c_client(dev); | |
419 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
420 | switch (chip->engines[nr - 1].mode) { | |
421 | case LP5521_CMD_RUN: | |
422 | return sprintf(buf, "run\n"); | |
423 | case LP5521_CMD_LOAD: | |
424 | return sprintf(buf, "load\n"); | |
425 | case LP5521_CMD_DISABLED: | |
426 | return sprintf(buf, "disabled\n"); | |
427 | default: | |
428 | return sprintf(buf, "disabled\n"); | |
429 | } | |
430 | } | |
431 | ||
432 | #define show_mode(nr) \ | |
433 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
434 | struct device_attribute *attr, \ | |
435 | char *buf) \ | |
436 | { \ | |
437 | return show_engine_mode(dev, attr, buf, nr); \ | |
438 | } | |
439 | show_mode(1) | |
440 | show_mode(2) | |
441 | show_mode(3) | |
442 | ||
443 | static ssize_t store_engine_mode(struct device *dev, | |
444 | struct device_attribute *attr, | |
445 | const char *buf, size_t len, int nr) | |
446 | { | |
447 | struct i2c_client *client = to_i2c_client(dev); | |
448 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
449 | struct lp5521_engine *engine = &chip->engines[nr - 1]; | |
450 | mutex_lock(&chip->lock); | |
451 | ||
452 | if (!strncmp(buf, "run", 3)) | |
453 | lp5521_set_mode(engine, LP5521_CMD_RUN); | |
454 | else if (!strncmp(buf, "load", 4)) | |
455 | lp5521_set_mode(engine, LP5521_CMD_LOAD); | |
456 | else if (!strncmp(buf, "disabled", 8)) | |
457 | lp5521_set_mode(engine, LP5521_CMD_DISABLED); | |
458 | ||
459 | mutex_unlock(&chip->lock); | |
460 | return len; | |
461 | } | |
462 | ||
463 | #define store_mode(nr) \ | |
464 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
465 | struct device_attribute *attr, \ | |
466 | const char *buf, size_t len) \ | |
467 | { \ | |
468 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
469 | } | |
470 | store_mode(1) | |
471 | store_mode(2) | |
472 | store_mode(3) | |
473 | ||
474 | static ssize_t show_max_current(struct device *dev, | |
475 | struct device_attribute *attr, | |
476 | char *buf) | |
477 | { | |
478 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
479 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
480 | ||
481 | return sprintf(buf, "%d\n", led->max_current); | |
482 | } | |
483 | ||
484 | static ssize_t show_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->led_current); | |
492 | } | |
493 | ||
494 | static ssize_t store_current(struct device *dev, | |
495 | struct device_attribute *attr, | |
496 | const char *buf, size_t len) | |
497 | { | |
498 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
499 | struct lp5521_led *led = cdev_to_led(led_cdev); | |
500 | struct lp5521_chip *chip = led_to_lp5521(led); | |
501 | ssize_t ret; | |
502 | unsigned long curr; | |
503 | ||
504 | if (strict_strtoul(buf, 0, &curr)) | |
505 | return -EINVAL; | |
506 | ||
507 | if (curr > led->max_current) | |
508 | return -EINVAL; | |
509 | ||
510 | mutex_lock(&chip->lock); | |
511 | ret = lp5521_set_led_current(chip, led->id, curr); | |
512 | mutex_unlock(&chip->lock); | |
513 | ||
514 | if (ret < 0) | |
515 | return ret; | |
516 | ||
517 | led->led_current = (u8)curr; | |
518 | ||
519 | return len; | |
520 | } | |
521 | ||
522 | static ssize_t lp5521_selftest(struct device *dev, | |
523 | struct device_attribute *attr, | |
524 | char *buf) | |
525 | { | |
526 | struct i2c_client *client = to_i2c_client(dev); | |
527 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
528 | int ret; | |
529 | ||
530 | mutex_lock(&chip->lock); | |
531 | ret = lp5521_run_selftest(chip, buf); | |
532 | mutex_unlock(&chip->lock); | |
533 | return sprintf(buf, "%s\n", ret ? "FAIL" : "OK"); | |
534 | } | |
535 | ||
536 | /* led class device attributes */ | |
67d1da79 | 537 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); |
500fe141 SO |
538 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); |
539 | ||
540 | static struct attribute *lp5521_led_attributes[] = { | |
541 | &dev_attr_led_current.attr, | |
542 | &dev_attr_max_current.attr, | |
543 | NULL, | |
544 | }; | |
545 | ||
546 | static struct attribute_group lp5521_led_attribute_group = { | |
547 | .attrs = lp5521_led_attributes | |
548 | }; | |
549 | ||
550 | /* device attributes */ | |
67d1da79 | 551 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, |
500fe141 | 552 | show_engine1_mode, store_engine1_mode); |
67d1da79 | 553 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, |
500fe141 | 554 | show_engine2_mode, store_engine2_mode); |
67d1da79 | 555 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, |
500fe141 | 556 | show_engine3_mode, store_engine3_mode); |
67d1da79 VK |
557 | static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); |
558 | static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); | |
559 | static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); | |
500fe141 SO |
560 | static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL); |
561 | ||
562 | static struct attribute *lp5521_attributes[] = { | |
563 | &dev_attr_engine1_mode.attr, | |
564 | &dev_attr_engine2_mode.attr, | |
565 | &dev_attr_engine3_mode.attr, | |
566 | &dev_attr_selftest.attr, | |
500fe141 | 567 | &dev_attr_engine1_load.attr, |
500fe141 | 568 | &dev_attr_engine2_load.attr, |
500fe141 SO |
569 | &dev_attr_engine3_load.attr, |
570 | NULL | |
571 | }; | |
572 | ||
573 | static const struct attribute_group lp5521_group = { | |
574 | .attrs = lp5521_attributes, | |
575 | }; | |
576 | ||
500fe141 SO |
577 | static int lp5521_register_sysfs(struct i2c_client *client) |
578 | { | |
579 | struct device *dev = &client->dev; | |
580 | return sysfs_create_group(&dev->kobj, &lp5521_group); | |
581 | } | |
582 | ||
583 | static void lp5521_unregister_sysfs(struct i2c_client *client) | |
584 | { | |
585 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
586 | struct device *dev = &client->dev; | |
587 | int i; | |
588 | ||
589 | sysfs_remove_group(&dev->kobj, &lp5521_group); | |
590 | ||
500fe141 SO |
591 | for (i = 0; i < chip->num_leds; i++) |
592 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
593 | &lp5521_led_attribute_group); | |
594 | } | |
595 | ||
596 | static int __init lp5521_init_led(struct lp5521_led *led, | |
597 | struct i2c_client *client, | |
598 | int chan, struct lp5521_platform_data *pdata) | |
599 | { | |
600 | struct device *dev = &client->dev; | |
601 | char name[32]; | |
602 | int res; | |
603 | ||
604 | if (chan >= LP5521_MAX_LEDS) | |
605 | return -EINVAL; | |
606 | ||
607 | if (pdata->led_config[chan].led_current == 0) | |
608 | return 0; | |
609 | ||
610 | led->led_current = pdata->led_config[chan].led_current; | |
611 | led->max_current = pdata->led_config[chan].max_current; | |
612 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
613 | ||
614 | if (led->chan_nr >= LP5521_MAX_LEDS) { | |
615 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
616 | LP5521_MAX_LEDS - 1); | |
617 | return -EINVAL; | |
618 | } | |
619 | ||
61a83932 AM |
620 | snprintf(name, sizeof(name), "%s:channel%d", |
621 | pdata->label ?: client->name, chan); | |
500fe141 SO |
622 | led->cdev.brightness_set = lp5521_set_brightness; |
623 | led->cdev.name = name; | |
624 | res = led_classdev_register(dev, &led->cdev); | |
625 | if (res < 0) { | |
626 | dev_err(dev, "couldn't register led on channel %d\n", chan); | |
627 | return res; | |
628 | } | |
629 | ||
630 | res = sysfs_create_group(&led->cdev.dev->kobj, | |
631 | &lp5521_led_attribute_group); | |
632 | if (res < 0) { | |
633 | dev_err(dev, "couldn't register current attribute\n"); | |
634 | led_classdev_unregister(&led->cdev); | |
635 | return res; | |
636 | } | |
637 | return 0; | |
638 | } | |
639 | ||
640 | static int lp5521_probe(struct i2c_client *client, | |
641 | const struct i2c_device_id *id) | |
642 | { | |
643 | struct lp5521_chip *chip; | |
644 | struct lp5521_platform_data *pdata; | |
645 | int ret, i, led; | |
646 | ||
647 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
648 | if (!chip) | |
649 | return -ENOMEM; | |
650 | ||
651 | i2c_set_clientdata(client, chip); | |
652 | chip->client = client; | |
653 | ||
654 | pdata = client->dev.platform_data; | |
655 | ||
656 | if (!pdata) { | |
657 | dev_err(&client->dev, "no platform data\n"); | |
658 | ret = -EINVAL; | |
659 | goto fail1; | |
660 | } | |
661 | ||
662 | mutex_init(&chip->lock); | |
663 | ||
664 | chip->pdata = pdata; | |
665 | ||
666 | if (pdata->setup_resources) { | |
667 | ret = pdata->setup_resources(); | |
668 | if (ret < 0) | |
669 | goto fail1; | |
670 | } | |
671 | ||
672 | if (pdata->enable) { | |
673 | pdata->enable(0); | |
09c76b0f | 674 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
500fe141 | 675 | pdata->enable(1); |
09c76b0f | 676 | usleep_range(1000, 2000); /* 500us abs min. */ |
500fe141 SO |
677 | } |
678 | ||
95ea8eec SO |
679 | lp5521_write(client, LP5521_REG_RESET, 0xff); |
680 | usleep_range(10000, 20000); /* | |
681 | * Exact value is not available. 10 - 20ms | |
682 | * appears to be enough for reset. | |
683 | */ | |
500fe141 SO |
684 | ret = lp5521_detect(client); |
685 | ||
686 | if (ret) { | |
687 | dev_err(&client->dev, "Chip not found\n"); | |
688 | goto fail2; | |
689 | } | |
690 | ||
691 | dev_info(&client->dev, "%s programmable led chip found\n", id->name); | |
692 | ||
d4e7ad03 | 693 | ret = lp5521_configure(client); |
500fe141 SO |
694 | if (ret < 0) { |
695 | dev_err(&client->dev, "error configuring chip\n"); | |
696 | goto fail2; | |
697 | } | |
698 | ||
699 | /* Initialize leds */ | |
700 | chip->num_channels = pdata->num_channels; | |
701 | chip->num_leds = 0; | |
702 | led = 0; | |
703 | for (i = 0; i < pdata->num_channels; i++) { | |
704 | /* Do not initialize channels that are not connected */ | |
705 | if (pdata->led_config[i].led_current == 0) | |
706 | continue; | |
707 | ||
708 | ret = lp5521_init_led(&chip->leds[led], client, i, pdata); | |
709 | if (ret) { | |
710 | dev_err(&client->dev, "error initializing leds\n"); | |
711 | goto fail3; | |
712 | } | |
713 | chip->num_leds++; | |
714 | ||
715 | chip->leds[led].id = led; | |
716 | /* Set initial LED current */ | |
717 | lp5521_set_led_current(chip, led, | |
718 | chip->leds[led].led_current); | |
719 | ||
720 | INIT_WORK(&(chip->leds[led].brightness_work), | |
721 | lp5521_led_brightness_work); | |
722 | ||
723 | led++; | |
724 | } | |
725 | ||
726 | ret = lp5521_register_sysfs(client); | |
727 | if (ret) { | |
728 | dev_err(&client->dev, "registering sysfs failed\n"); | |
729 | goto fail3; | |
730 | } | |
731 | return ret; | |
732 | fail3: | |
733 | for (i = 0; i < chip->num_leds; i++) { | |
734 | led_classdev_unregister(&chip->leds[i].cdev); | |
735 | cancel_work_sync(&chip->leds[i].brightness_work); | |
736 | } | |
737 | fail2: | |
738 | if (pdata->enable) | |
739 | pdata->enable(0); | |
740 | if (pdata->release_resources) | |
741 | pdata->release_resources(); | |
742 | fail1: | |
743 | kfree(chip); | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static int lp5521_remove(struct i2c_client *client) | |
748 | { | |
749 | struct lp5521_chip *chip = i2c_get_clientdata(client); | |
750 | int i; | |
751 | ||
752 | lp5521_unregister_sysfs(client); | |
753 | ||
754 | for (i = 0; i < chip->num_leds; i++) { | |
755 | led_classdev_unregister(&chip->leds[i].cdev); | |
756 | cancel_work_sync(&chip->leds[i].brightness_work); | |
757 | } | |
758 | ||
759 | if (chip->pdata->enable) | |
760 | chip->pdata->enable(0); | |
761 | if (chip->pdata->release_resources) | |
762 | chip->pdata->release_resources(); | |
763 | kfree(chip); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static const struct i2c_device_id lp5521_id[] = { | |
768 | { "lp5521", 0 }, /* Three channel chip */ | |
769 | { } | |
770 | }; | |
771 | MODULE_DEVICE_TABLE(i2c, lp5521_id); | |
772 | ||
773 | static struct i2c_driver lp5521_driver = { | |
774 | .driver = { | |
775 | .name = "lp5521", | |
776 | }, | |
777 | .probe = lp5521_probe, | |
778 | .remove = lp5521_remove, | |
779 | .id_table = lp5521_id, | |
780 | }; | |
781 | ||
782 | static int __init lp5521_init(void) | |
783 | { | |
784 | int ret; | |
785 | ||
786 | ret = i2c_add_driver(&lp5521_driver); | |
787 | ||
788 | if (ret < 0) | |
789 | printk(KERN_ALERT "Adding lp5521 driver failed\n"); | |
790 | ||
791 | return ret; | |
792 | } | |
793 | ||
794 | static void __exit lp5521_exit(void) | |
795 | { | |
796 | i2c_del_driver(&lp5521_driver); | |
797 | } | |
798 | ||
799 | module_init(lp5521_init); | |
800 | module_exit(lp5521_exit); | |
801 | ||
802 | MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo"); | |
803 | MODULE_DESCRIPTION("LP5521 LED engine"); | |
804 | MODULE_LICENSE("GPL v2"); |