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0efba16c SO |
1 | /* |
2 | * lp5523.c - LP5523 LED 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-lp5523.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <linux/slab.h> | |
37 | ||
38 | #define LP5523_REG_ENABLE 0x00 | |
39 | #define LP5523_REG_OP_MODE 0x01 | |
40 | #define LP5523_REG_RATIOMETRIC_MSB 0x02 | |
41 | #define LP5523_REG_RATIOMETRIC_LSB 0x03 | |
42 | #define LP5523_REG_ENABLE_LEDS_MSB 0x04 | |
43 | #define LP5523_REG_ENABLE_LEDS_LSB 0x05 | |
44 | #define LP5523_REG_LED_CNTRL_BASE 0x06 | |
45 | #define LP5523_REG_LED_PWM_BASE 0x16 | |
46 | #define LP5523_REG_LED_CURRENT_BASE 0x26 | |
47 | #define LP5523_REG_CONFIG 0x36 | |
48 | #define LP5523_REG_CHANNEL1_PC 0x37 | |
49 | #define LP5523_REG_CHANNEL2_PC 0x38 | |
50 | #define LP5523_REG_CHANNEL3_PC 0x39 | |
51 | #define LP5523_REG_STATUS 0x3a | |
52 | #define LP5523_REG_GPO 0x3b | |
53 | #define LP5523_REG_VARIABLE 0x3c | |
54 | #define LP5523_REG_RESET 0x3d | |
55 | #define LP5523_REG_TEMP_CTRL 0x3e | |
56 | #define LP5523_REG_TEMP_READ 0x3f | |
57 | #define LP5523_REG_TEMP_WRITE 0x40 | |
58 | #define LP5523_REG_LED_TEST_CTRL 0x41 | |
59 | #define LP5523_REG_LED_TEST_ADC 0x42 | |
60 | #define LP5523_REG_ENG1_VARIABLE 0x45 | |
61 | #define LP5523_REG_ENG2_VARIABLE 0x46 | |
62 | #define LP5523_REG_ENG3_VARIABLE 0x47 | |
63 | #define LP5523_REG_MASTER_FADER1 0x48 | |
64 | #define LP5523_REG_MASTER_FADER2 0x49 | |
65 | #define LP5523_REG_MASTER_FADER3 0x4a | |
66 | #define LP5523_REG_CH1_PROG_START 0x4c | |
67 | #define LP5523_REG_CH2_PROG_START 0x4d | |
68 | #define LP5523_REG_CH3_PROG_START 0x4e | |
69 | #define LP5523_REG_PROG_PAGE_SEL 0x4f | |
70 | #define LP5523_REG_PROG_MEM 0x50 | |
71 | ||
72 | #define LP5523_CMD_LOAD 0x15 /* 00010101 */ | |
73 | #define LP5523_CMD_RUN 0x2a /* 00101010 */ | |
74 | #define LP5523_CMD_DISABLED 0x00 /* 00000000 */ | |
75 | ||
76 | #define LP5523_ENABLE 0x40 | |
77 | #define LP5523_AUTO_INC 0x40 | |
78 | #define LP5523_PWR_SAVE 0x20 | |
79 | #define LP5523_PWM_PWR_SAVE 0x04 | |
80 | #define LP5523_CP_1 0x08 | |
81 | #define LP5523_CP_1_5 0x10 | |
82 | #define LP5523_CP_AUTO 0x18 | |
83 | #define LP5523_INT_CLK 0x01 | |
84 | #define LP5523_AUTO_CLK 0x02 | |
85 | #define LP5523_EN_LEDTEST 0x80 | |
86 | #define LP5523_LEDTEST_DONE 0x80 | |
87 | ||
88 | #define LP5523_DEFAULT_CURRENT 50 /* microAmps */ | |
89 | #define LP5523_PROGRAM_LENGTH 32 /* in bytes */ | |
90 | #define LP5523_PROGRAM_PAGES 6 | |
91 | #define LP5523_ADC_SHORTCIRC_LIM 80 | |
92 | ||
93 | #define LP5523_LEDS 9 | |
94 | #define LP5523_ENGINES 3 | |
95 | ||
96 | #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */ | |
97 | ||
98 | #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */ | |
99 | ||
100 | #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING | |
101 | ||
102 | #define LP5523_EXT_CLK_USED 0x08 | |
103 | ||
104 | #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led))) | |
105 | #define SHIFT_MASK(id) (((id) - 1) * 2) | |
106 | ||
107 | struct lp5523_engine { | |
108 | const struct attribute_group *attributes; | |
109 | int id; | |
110 | u8 mode; | |
111 | u8 prog_page; | |
112 | u8 mux_page; | |
113 | u16 led_mux; | |
114 | u8 engine_mask; | |
115 | }; | |
116 | ||
117 | struct lp5523_led { | |
118 | int id; | |
119 | u8 chan_nr; | |
120 | u8 led_current; | |
121 | u8 max_current; | |
122 | struct led_classdev cdev; | |
123 | struct work_struct brightness_work; | |
124 | u8 brightness; | |
125 | }; | |
126 | ||
127 | struct lp5523_chip { | |
128 | struct mutex lock; /* Serialize control */ | |
129 | struct i2c_client *client; | |
130 | struct lp5523_engine engines[LP5523_ENGINES]; | |
131 | struct lp5523_led leds[LP5523_LEDS]; | |
132 | struct lp5523_platform_data *pdata; | |
133 | u8 num_channels; | |
134 | u8 num_leds; | |
135 | }; | |
136 | ||
87dbf623 SO |
137 | static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) |
138 | { | |
139 | return container_of(cdev, struct lp5523_led, cdev); | |
140 | } | |
0efba16c | 141 | |
87dbf623 | 142 | static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) |
0efba16c SO |
143 | { |
144 | return container_of(engine, struct lp5523_chip, | |
145 | engines[engine->id - 1]); | |
146 | } | |
147 | ||
87dbf623 | 148 | static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) |
0efba16c SO |
149 | { |
150 | return container_of(led, struct lp5523_chip, | |
151 | leds[led->id]); | |
152 | } | |
153 | ||
154 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode); | |
155 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); | |
156 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern); | |
157 | ||
158 | static void lp5523_led_brightness_work(struct work_struct *work); | |
159 | ||
160 | static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) | |
161 | { | |
162 | return i2c_smbus_write_byte_data(client, reg, value); | |
163 | } | |
164 | ||
165 | static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) | |
166 | { | |
167 | s32 ret = i2c_smbus_read_byte_data(client, reg); | |
168 | ||
169 | if (ret < 0) | |
170 | return -EIO; | |
171 | ||
172 | *buf = ret; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int lp5523_detect(struct i2c_client *client) | |
177 | { | |
178 | int ret; | |
179 | u8 buf; | |
180 | ||
181 | ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40); | |
182 | if (ret) | |
183 | return ret; | |
184 | ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); | |
185 | if (ret) | |
186 | return ret; | |
187 | if (buf == 0x40) | |
188 | return 0; | |
189 | else | |
190 | return -ENODEV; | |
191 | } | |
192 | ||
193 | static int lp5523_configure(struct i2c_client *client) | |
194 | { | |
195 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
196 | int ret = 0; | |
197 | u8 status; | |
198 | ||
199 | /* one pattern per engine setting led mux start and stop addresses */ | |
200 | u8 pattern[][LP5523_PROGRAM_LENGTH] = { | |
201 | { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, | |
202 | { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, | |
203 | { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, | |
204 | }; | |
205 | ||
206 | lp5523_write(client, LP5523_REG_RESET, 0xff); | |
207 | ||
208 | usleep_range(10000, 100000); | |
209 | ||
210 | ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); | |
211 | /* Chip startup time after reset is 500 us */ | |
212 | usleep_range(1000, 10000); | |
213 | ||
214 | ret |= lp5523_write(client, LP5523_REG_CONFIG, | |
215 | LP5523_AUTO_INC | LP5523_PWR_SAVE | | |
216 | LP5523_CP_AUTO | LP5523_AUTO_CLK | | |
217 | LP5523_PWM_PWR_SAVE); | |
218 | ||
219 | /* turn on all leds */ | |
220 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01); | |
221 | ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff); | |
222 | ||
223 | /* hardcode 32 bytes of memory for each engine from program memory */ | |
224 | ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00); | |
225 | ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10); | |
226 | ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20); | |
227 | ||
228 | /* write led mux address space for each channel */ | |
229 | ret |= lp5523_load_program(&chip->engines[0], pattern[0]); | |
230 | ret |= lp5523_load_program(&chip->engines[1], pattern[1]); | |
231 | ret |= lp5523_load_program(&chip->engines[2], pattern[2]); | |
232 | ||
233 | if (ret) { | |
234 | dev_err(&client->dev, "could not load mux programs\n"); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | /* set all engines exec state and mode to run 00101010 */ | |
239 | ret |= lp5523_write(client, LP5523_REG_ENABLE, | |
240 | (LP5523_CMD_RUN | LP5523_ENABLE)); | |
241 | ||
242 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN); | |
243 | ||
244 | if (ret) { | |
245 | dev_err(&client->dev, "could not start mux programs\n"); | |
246 | return -1; | |
247 | } | |
248 | ||
249 | /* Wait 3ms and check the engine status */ | |
250 | usleep_range(3000, 20000); | |
251 | lp5523_read(client, LP5523_REG_STATUS, &status); | |
252 | status &= LP5523_ENG_STATUS_MASK; | |
253 | ||
254 | if (status == LP5523_ENG_STATUS_MASK) { | |
255 | dev_dbg(&client->dev, "all engines configured\n"); | |
256 | } else { | |
257 | dev_info(&client->dev, "status == %x\n", status); | |
258 | dev_err(&client->dev, "cound not configure LED engine\n"); | |
259 | return -1; | |
260 | } | |
261 | ||
262 | dev_info(&client->dev, "disabling engines\n"); | |
263 | ||
264 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode) | |
270 | { | |
271 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
272 | struct i2c_client *client = chip->client; | |
273 | int ret; | |
274 | u8 engine_state; | |
275 | ||
276 | ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state); | |
277 | if (ret) | |
278 | goto fail; | |
279 | ||
280 | engine_state &= ~(engine->engine_mask); | |
281 | ||
282 | /* set mode only for this engine */ | |
283 | mode &= engine->engine_mask; | |
284 | ||
285 | engine_state |= mode; | |
286 | ||
287 | ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state); | |
288 | fail: | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux) | |
293 | { | |
294 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
295 | struct i2c_client *client = chip->client; | |
296 | int ret = 0; | |
297 | ||
298 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); | |
299 | ||
300 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page); | |
301 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM, | |
302 | (u8)(mux >> 8)); | |
303 | ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux)); | |
304 | engine->led_mux = mux; | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
309 | static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern) | |
310 | { | |
311 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
312 | struct i2c_client *client = chip->client; | |
313 | ||
314 | int ret = 0; | |
315 | ||
316 | ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); | |
317 | ||
318 | ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, | |
319 | engine->prog_page); | |
320 | ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM, | |
321 | LP5523_PROGRAM_LENGTH, pattern); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
326 | static int lp5523_run_program(struct lp5523_engine *engine) | |
327 | { | |
328 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
329 | struct i2c_client *client = chip->client; | |
330 | int ret; | |
331 | ||
332 | ret = lp5523_write(client, LP5523_REG_ENABLE, | |
333 | LP5523_CMD_RUN | LP5523_ENABLE); | |
334 | if (ret) | |
335 | goto fail; | |
336 | ||
337 | ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN); | |
338 | fail: | |
339 | return ret; | |
340 | } | |
341 | ||
342 | static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len) | |
343 | { | |
344 | int i; | |
345 | u16 tmp_mux = 0; | |
346 | len = len < LP5523_LEDS ? len : LP5523_LEDS; | |
347 | for (i = 0; i < len; i++) { | |
348 | switch (buf[i]) { | |
349 | case '1': | |
350 | tmp_mux |= (1 << i); | |
351 | break; | |
352 | case '0': | |
353 | break; | |
354 | case '\n': | |
355 | i = len; | |
356 | break; | |
357 | default: | |
358 | return -1; | |
359 | } | |
360 | } | |
361 | *mux = tmp_mux; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static void lp5523_mux_to_array(u16 led_mux, char *array) | |
367 | { | |
368 | int i, pos = 0; | |
369 | for (i = 0; i < LP5523_LEDS; i++) | |
370 | pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); | |
371 | ||
372 | array[pos] = '\0'; | |
373 | } | |
374 | ||
375 | /*--------------------------------------------------------------*/ | |
376 | /* Sysfs interface */ | |
377 | /*--------------------------------------------------------------*/ | |
378 | ||
379 | static ssize_t show_engine_leds(struct device *dev, | |
380 | struct device_attribute *attr, | |
381 | char *buf, int nr) | |
382 | { | |
383 | struct i2c_client *client = to_i2c_client(dev); | |
384 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
385 | char mux[LP5523_LEDS + 1]; | |
386 | ||
387 | lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); | |
388 | ||
389 | return sprintf(buf, "%s\n", mux); | |
390 | } | |
391 | ||
392 | #define show_leds(nr) \ | |
393 | static ssize_t show_engine##nr##_leds(struct device *dev, \ | |
394 | struct device_attribute *attr, \ | |
395 | char *buf) \ | |
396 | { \ | |
397 | return show_engine_leds(dev, attr, buf, nr); \ | |
398 | } | |
399 | show_leds(1) | |
400 | show_leds(2) | |
401 | show_leds(3) | |
402 | ||
403 | static ssize_t store_engine_leds(struct device *dev, | |
404 | struct device_attribute *attr, | |
405 | const char *buf, size_t len, int nr) | |
406 | { | |
407 | struct i2c_client *client = to_i2c_client(dev); | |
408 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
409 | u16 mux = 0; | |
410 | ||
411 | if (lp5523_mux_parse(buf, &mux, len)) | |
412 | return -EINVAL; | |
413 | ||
414 | if (lp5523_load_mux(&chip->engines[nr - 1], mux)) | |
415 | return -EINVAL; | |
416 | ||
417 | return len; | |
418 | } | |
419 | ||
420 | #define store_leds(nr) \ | |
421 | static ssize_t store_engine##nr##_leds(struct device *dev, \ | |
422 | struct device_attribute *attr, \ | |
423 | const char *buf, size_t len) \ | |
424 | { \ | |
425 | return store_engine_leds(dev, attr, buf, len, nr); \ | |
426 | } | |
427 | store_leds(1) | |
428 | store_leds(2) | |
429 | store_leds(3) | |
430 | ||
431 | static ssize_t lp5523_selftest(struct device *dev, | |
432 | struct device_attribute *attr, | |
433 | char *buf) | |
434 | { | |
435 | struct i2c_client *client = to_i2c_client(dev); | |
436 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
437 | int i, ret, pos = 0; | |
438 | int led = 0; | |
439 | u8 status, adc, vdd; | |
440 | ||
441 | mutex_lock(&chip->lock); | |
442 | ||
443 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); | |
444 | if (ret < 0) | |
445 | goto fail; | |
446 | ||
447 | /* Check that ext clock is really in use if requested */ | |
448 | if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) | |
449 | if ((status & LP5523_EXT_CLK_USED) == 0) | |
450 | goto fail; | |
451 | ||
452 | /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ | |
453 | lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, | |
454 | LP5523_EN_LEDTEST | 16); | |
455 | usleep_range(3000, 10000); | |
456 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); | |
457 | if (!(status & LP5523_LEDTEST_DONE)) | |
458 | usleep_range(3000, 10000); | |
459 | ||
460 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); | |
461 | vdd--; /* There may be some fluctuation in measurement */ | |
462 | ||
463 | for (i = 0; i < LP5523_LEDS; i++) { | |
464 | /* Skip non-existing channels */ | |
465 | if (chip->pdata->led_config[i].led_current == 0) | |
466 | continue; | |
467 | ||
468 | /* Set default current */ | |
469 | lp5523_write(chip->client, | |
470 | LP5523_REG_LED_CURRENT_BASE + i, | |
471 | chip->pdata->led_config[i].led_current); | |
472 | ||
473 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); | |
474 | /* let current stabilize 2ms before measurements start */ | |
475 | usleep_range(2000, 10000); | |
476 | lp5523_write(chip->client, | |
477 | LP5523_REG_LED_TEST_CTRL, | |
478 | LP5523_EN_LEDTEST | i); | |
479 | /* ledtest takes 2.7ms */ | |
480 | usleep_range(3000, 10000); | |
481 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); | |
482 | if (!(status & LP5523_LEDTEST_DONE)) | |
483 | usleep_range(3000, 10000); | |
484 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); | |
485 | ||
486 | if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) | |
487 | pos += sprintf(buf + pos, "LED %d FAIL\n", i); | |
488 | ||
489 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); | |
490 | ||
491 | /* Restore current */ | |
492 | lp5523_write(chip->client, | |
493 | LP5523_REG_LED_CURRENT_BASE + i, | |
494 | chip->leds[led].led_current); | |
495 | led++; | |
496 | } | |
497 | if (pos == 0) | |
498 | pos = sprintf(buf, "OK\n"); | |
499 | goto release_lock; | |
500 | fail: | |
501 | pos = sprintf(buf, "FAIL\n"); | |
502 | ||
503 | release_lock: | |
504 | mutex_unlock(&chip->lock); | |
505 | ||
506 | return pos; | |
507 | } | |
508 | ||
509 | static void lp5523_set_brightness(struct led_classdev *cdev, | |
510 | enum led_brightness brightness) | |
511 | { | |
512 | struct lp5523_led *led = cdev_to_led(cdev); | |
513 | ||
514 | led->brightness = (u8)brightness; | |
515 | ||
516 | schedule_work(&led->brightness_work); | |
517 | } | |
518 | ||
519 | static void lp5523_led_brightness_work(struct work_struct *work) | |
520 | { | |
521 | struct lp5523_led *led = container_of(work, | |
522 | struct lp5523_led, | |
523 | brightness_work); | |
524 | struct lp5523_chip *chip = led_to_lp5523(led); | |
525 | struct i2c_client *client = chip->client; | |
526 | ||
527 | mutex_lock(&chip->lock); | |
528 | ||
529 | lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, | |
530 | led->brightness); | |
531 | ||
532 | mutex_unlock(&chip->lock); | |
533 | } | |
534 | ||
535 | static int lp5523_do_store_load(struct lp5523_engine *engine, | |
536 | const char *buf, size_t len) | |
537 | { | |
538 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
539 | struct i2c_client *client = chip->client; | |
540 | int ret, nrchars, offset = 0, i = 0; | |
541 | char c[3]; | |
542 | unsigned cmd; | |
543 | u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; | |
544 | ||
545 | while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { | |
546 | /* separate sscanfs because length is working only for %s */ | |
547 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); | |
548 | ret = sscanf(c, "%2x", &cmd); | |
549 | if (ret != 1) | |
550 | goto fail; | |
551 | pattern[i] = (u8)cmd; | |
552 | ||
553 | offset += nrchars; | |
554 | i++; | |
555 | } | |
556 | ||
557 | /* Each instruction is 16bit long. Check that length is even */ | |
558 | if (i % 2) | |
559 | goto fail; | |
560 | ||
561 | mutex_lock(&chip->lock); | |
562 | ||
563 | ret = lp5523_load_program(engine, pattern); | |
564 | mutex_unlock(&chip->lock); | |
565 | ||
566 | if (ret) { | |
567 | dev_err(&client->dev, "failed loading pattern\n"); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | return len; | |
572 | fail: | |
573 | dev_err(&client->dev, "wrong pattern format\n"); | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
577 | static ssize_t store_engine_load(struct device *dev, | |
578 | struct device_attribute *attr, | |
579 | const char *buf, size_t len, int nr) | |
580 | { | |
581 | struct i2c_client *client = to_i2c_client(dev); | |
582 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
583 | return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); | |
584 | } | |
585 | ||
586 | #define store_load(nr) \ | |
587 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
588 | struct device_attribute *attr, \ | |
589 | const char *buf, size_t len) \ | |
590 | { \ | |
591 | return store_engine_load(dev, attr, buf, len, nr); \ | |
592 | } | |
593 | store_load(1) | |
594 | store_load(2) | |
595 | store_load(3) | |
596 | ||
597 | static ssize_t show_engine_mode(struct device *dev, | |
598 | struct device_attribute *attr, | |
599 | char *buf, int nr) | |
600 | { | |
601 | struct i2c_client *client = to_i2c_client(dev); | |
602 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
603 | switch (chip->engines[nr - 1].mode) { | |
604 | case LP5523_CMD_RUN: | |
605 | return sprintf(buf, "run\n"); | |
606 | case LP5523_CMD_LOAD: | |
607 | return sprintf(buf, "load\n"); | |
608 | case LP5523_CMD_DISABLED: | |
609 | return sprintf(buf, "disabled\n"); | |
610 | default: | |
611 | return sprintf(buf, "disabled\n"); | |
612 | } | |
613 | } | |
614 | ||
615 | #define show_mode(nr) \ | |
616 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
617 | struct device_attribute *attr, \ | |
618 | char *buf) \ | |
619 | { \ | |
620 | return show_engine_mode(dev, attr, buf, nr); \ | |
621 | } | |
622 | show_mode(1) | |
623 | show_mode(2) | |
624 | show_mode(3) | |
625 | ||
626 | static ssize_t store_engine_mode(struct device *dev, | |
627 | struct device_attribute *attr, | |
628 | const char *buf, size_t len, int nr) | |
629 | { | |
630 | struct i2c_client *client = to_i2c_client(dev); | |
631 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
632 | struct lp5523_engine *engine = &chip->engines[nr - 1]; | |
633 | mutex_lock(&chip->lock); | |
634 | ||
635 | if (!strncmp(buf, "run", 3)) | |
636 | lp5523_set_mode(engine, LP5523_CMD_RUN); | |
637 | else if (!strncmp(buf, "load", 4)) | |
638 | lp5523_set_mode(engine, LP5523_CMD_LOAD); | |
639 | else if (!strncmp(buf, "disabled", 8)) | |
640 | lp5523_set_mode(engine, LP5523_CMD_DISABLED); | |
641 | ||
642 | mutex_unlock(&chip->lock); | |
643 | return len; | |
644 | } | |
645 | ||
646 | #define store_mode(nr) \ | |
647 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
648 | struct device_attribute *attr, \ | |
649 | const char *buf, size_t len) \ | |
650 | { \ | |
651 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
652 | } | |
653 | store_mode(1) | |
654 | store_mode(2) | |
655 | store_mode(3) | |
656 | ||
657 | static ssize_t show_max_current(struct device *dev, | |
658 | struct device_attribute *attr, | |
659 | char *buf) | |
660 | { | |
661 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
662 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
663 | ||
664 | return sprintf(buf, "%d\n", led->max_current); | |
665 | } | |
666 | ||
667 | static ssize_t show_current(struct device *dev, | |
668 | struct device_attribute *attr, | |
669 | char *buf) | |
670 | { | |
671 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
672 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
673 | ||
674 | return sprintf(buf, "%d\n", led->led_current); | |
675 | } | |
676 | ||
677 | static ssize_t store_current(struct device *dev, | |
678 | struct device_attribute *attr, | |
679 | const char *buf, size_t len) | |
680 | { | |
681 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
682 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
683 | struct lp5523_chip *chip = led_to_lp5523(led); | |
684 | ssize_t ret; | |
685 | unsigned long curr; | |
686 | ||
687 | if (strict_strtoul(buf, 0, &curr)) | |
688 | return -EINVAL; | |
689 | ||
690 | if (curr > led->max_current) | |
691 | return -EINVAL; | |
692 | ||
693 | mutex_lock(&chip->lock); | |
694 | ret = lp5523_write(chip->client, | |
695 | LP5523_REG_LED_CURRENT_BASE + led->chan_nr, | |
696 | (u8)curr); | |
697 | mutex_unlock(&chip->lock); | |
698 | ||
699 | if (ret < 0) | |
700 | return ret; | |
701 | ||
702 | led->led_current = (u8)curr; | |
703 | ||
704 | return len; | |
705 | } | |
706 | ||
707 | /* led class device attributes */ | |
708 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current); | |
709 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); | |
710 | ||
711 | static struct attribute *lp5523_led_attributes[] = { | |
712 | &dev_attr_led_current.attr, | |
713 | &dev_attr_max_current.attr, | |
714 | NULL, | |
715 | }; | |
716 | ||
717 | static struct attribute_group lp5523_led_attribute_group = { | |
718 | .attrs = lp5523_led_attributes | |
719 | }; | |
720 | ||
721 | /* device attributes */ | |
722 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO, | |
723 | show_engine1_mode, store_engine1_mode); | |
724 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO, | |
725 | show_engine2_mode, store_engine2_mode); | |
726 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO, | |
727 | show_engine3_mode, store_engine3_mode); | |
728 | static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO, | |
729 | show_engine1_leds, store_engine1_leds); | |
730 | static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO, | |
731 | show_engine2_leds, store_engine2_leds); | |
732 | static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO, | |
733 | show_engine3_leds, store_engine3_leds); | |
734 | static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load); | |
735 | static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load); | |
736 | static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load); | |
737 | static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); | |
738 | ||
739 | static struct attribute *lp5523_attributes[] = { | |
740 | &dev_attr_engine1_mode.attr, | |
741 | &dev_attr_engine2_mode.attr, | |
742 | &dev_attr_engine3_mode.attr, | |
743 | &dev_attr_selftest.attr, | |
744 | NULL | |
745 | }; | |
746 | ||
747 | static struct attribute *lp5523_engine1_attributes[] = { | |
748 | &dev_attr_engine1_load.attr, | |
749 | &dev_attr_engine1_leds.attr, | |
750 | NULL | |
751 | }; | |
752 | ||
753 | static struct attribute *lp5523_engine2_attributes[] = { | |
754 | &dev_attr_engine2_load.attr, | |
755 | &dev_attr_engine2_leds.attr, | |
756 | NULL | |
757 | }; | |
758 | ||
759 | static struct attribute *lp5523_engine3_attributes[] = { | |
760 | &dev_attr_engine3_load.attr, | |
761 | &dev_attr_engine3_leds.attr, | |
762 | NULL | |
763 | }; | |
764 | ||
765 | static const struct attribute_group lp5523_group = { | |
766 | .attrs = lp5523_attributes, | |
767 | }; | |
768 | ||
769 | static const struct attribute_group lp5523_engine_group[] = { | |
770 | {.attrs = lp5523_engine1_attributes }, | |
771 | {.attrs = lp5523_engine2_attributes }, | |
772 | {.attrs = lp5523_engine3_attributes }, | |
773 | }; | |
774 | ||
775 | static int lp5523_register_sysfs(struct i2c_client *client) | |
776 | { | |
777 | struct device *dev = &client->dev; | |
778 | int ret; | |
779 | ||
780 | ret = sysfs_create_group(&dev->kobj, &lp5523_group); | |
781 | if (ret < 0) | |
782 | return ret; | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
787 | static void lp5523_unregister_sysfs(struct i2c_client *client) | |
788 | { | |
789 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
790 | struct device *dev = &client->dev; | |
791 | int i; | |
792 | ||
793 | sysfs_remove_group(&dev->kobj, &lp5523_group); | |
794 | ||
795 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) | |
796 | if (chip->engines[i].mode == LP5523_CMD_LOAD) | |
797 | sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]); | |
798 | ||
799 | for (i = 0; i < chip->num_leds; i++) | |
800 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
801 | &lp5523_led_attribute_group); | |
802 | } | |
803 | ||
804 | /*--------------------------------------------------------------*/ | |
805 | /* Set chip operating mode */ | |
806 | /*--------------------------------------------------------------*/ | |
807 | static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode) | |
808 | { | |
809 | /* engine to chip */ | |
810 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
811 | struct i2c_client *client = chip->client; | |
812 | struct device *dev = &client->dev; | |
813 | int ret = 0; | |
814 | ||
815 | /* if in that mode already do nothing, except for run */ | |
816 | if (mode == engine->mode && mode != LP5523_CMD_RUN) | |
817 | return 0; | |
818 | ||
819 | if (mode == LP5523_CMD_RUN) { | |
820 | ret = lp5523_run_program(engine); | |
821 | } else if (mode == LP5523_CMD_LOAD) { | |
822 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); | |
823 | lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); | |
824 | ||
825 | ret = sysfs_create_group(&dev->kobj, engine->attributes); | |
826 | if (ret) | |
827 | return ret; | |
828 | } else if (mode == LP5523_CMD_DISABLED) { | |
829 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); | |
830 | } | |
831 | ||
832 | /* remove load attribute from sysfs if not in load mode */ | |
833 | if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD) | |
834 | sysfs_remove_group(&dev->kobj, engine->attributes); | |
835 | ||
836 | engine->mode = mode; | |
837 | ||
838 | return ret; | |
839 | } | |
840 | ||
841 | /*--------------------------------------------------------------*/ | |
842 | /* Probe, Attach, Remove */ | |
843 | /*--------------------------------------------------------------*/ | |
844 | static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) | |
845 | { | |
846 | if (id < 1 || id > LP5523_ENGINES) | |
847 | return -1; | |
848 | engine->id = id; | |
849 | engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); | |
850 | engine->prog_page = id - 1; | |
851 | engine->mux_page = id + 2; | |
852 | engine->attributes = &lp5523_engine_group[id - 1]; | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev, | |
858 | int chan, struct lp5523_platform_data *pdata) | |
859 | { | |
860 | char name[32]; | |
861 | int res; | |
862 | ||
863 | if (chan >= LP5523_LEDS) | |
864 | return -EINVAL; | |
865 | ||
866 | if (pdata->led_config[chan].led_current) { | |
867 | led->led_current = pdata->led_config[chan].led_current; | |
868 | led->max_current = pdata->led_config[chan].max_current; | |
869 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
870 | ||
871 | if (led->chan_nr >= LP5523_LEDS) { | |
872 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
873 | LP5523_LEDS - 1); | |
874 | return -EINVAL; | |
875 | } | |
876 | ||
877 | snprintf(name, 32, "lp5523:channel%d", chan); | |
878 | ||
879 | led->cdev.name = name; | |
880 | led->cdev.brightness_set = lp5523_set_brightness; | |
881 | res = led_classdev_register(dev, &led->cdev); | |
882 | if (res < 0) { | |
883 | dev_err(dev, "couldn't register led on channel %d\n", | |
884 | chan); | |
885 | return res; | |
886 | } | |
887 | res = sysfs_create_group(&led->cdev.dev->kobj, | |
888 | &lp5523_led_attribute_group); | |
889 | if (res < 0) { | |
890 | dev_err(dev, "couldn't register current attribute\n"); | |
891 | led_classdev_unregister(&led->cdev); | |
892 | return res; | |
893 | } | |
894 | } else { | |
895 | led->led_current = 0; | |
896 | } | |
897 | return 0; | |
898 | } | |
899 | ||
900 | static struct i2c_driver lp5523_driver; | |
901 | ||
902 | static int lp5523_probe(struct i2c_client *client, | |
903 | const struct i2c_device_id *id) | |
904 | { | |
905 | struct lp5523_chip *chip; | |
906 | struct lp5523_platform_data *pdata; | |
907 | int ret, i, led; | |
908 | ||
909 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
910 | if (!chip) | |
911 | return -ENOMEM; | |
912 | ||
913 | i2c_set_clientdata(client, chip); | |
914 | chip->client = client; | |
915 | ||
916 | pdata = client->dev.platform_data; | |
917 | ||
918 | if (!pdata) { | |
919 | dev_err(&client->dev, "no platform data\n"); | |
920 | ret = -EINVAL; | |
921 | goto fail1; | |
922 | } | |
923 | ||
924 | mutex_init(&chip->lock); | |
925 | ||
926 | chip->pdata = pdata; | |
927 | ||
928 | if (pdata->setup_resources) { | |
929 | ret = pdata->setup_resources(); | |
930 | if (ret < 0) | |
931 | goto fail1; | |
932 | } | |
933 | ||
934 | if (pdata->enable) { | |
935 | pdata->enable(0); | |
936 | usleep_range(1000, 10000); | |
937 | pdata->enable(1); | |
938 | usleep_range(1000, 10000); /* Spec says min 500us */ | |
939 | } | |
940 | ||
941 | ret = lp5523_detect(client); | |
942 | if (ret) | |
943 | goto fail2; | |
944 | ||
945 | dev_info(&client->dev, "LP5523 Programmable led chip found\n"); | |
946 | ||
947 | /* Initialize engines */ | |
948 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
949 | ret = lp5523_init_engine(&chip->engines[i], i + 1); | |
950 | if (ret) { | |
951 | dev_err(&client->dev, "error initializing engine\n"); | |
952 | goto fail2; | |
953 | } | |
954 | } | |
955 | ret = lp5523_configure(client); | |
956 | if (ret < 0) { | |
957 | dev_err(&client->dev, "error configuring chip\n"); | |
958 | goto fail2; | |
959 | } | |
960 | ||
961 | /* Initialize leds */ | |
962 | chip->num_channels = pdata->num_channels; | |
963 | chip->num_leds = 0; | |
964 | led = 0; | |
965 | for (i = 0; i < pdata->num_channels; i++) { | |
966 | /* Do not initialize channels that are not connected */ | |
967 | if (pdata->led_config[i].led_current == 0) | |
968 | continue; | |
969 | ||
970 | ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata); | |
971 | if (ret) { | |
972 | dev_err(&client->dev, "error initializing leds\n"); | |
973 | goto fail3; | |
974 | } | |
975 | chip->num_leds++; | |
976 | ||
977 | chip->leds[led].id = led; | |
978 | /* Set LED current */ | |
979 | lp5523_write(client, | |
980 | LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
981 | chip->leds[led].led_current); | |
982 | ||
983 | INIT_WORK(&(chip->leds[led].brightness_work), | |
984 | lp5523_led_brightness_work); | |
985 | ||
986 | led++; | |
987 | } | |
988 | ||
989 | ret = lp5523_register_sysfs(client); | |
990 | if (ret) { | |
991 | dev_err(&client->dev, "registering sysfs failed\n"); | |
992 | goto fail3; | |
993 | } | |
994 | return ret; | |
995 | fail3: | |
996 | for (i = 0; i < chip->num_leds; i++) { | |
997 | led_classdev_unregister(&chip->leds[i].cdev); | |
998 | cancel_work_sync(&chip->leds[i].brightness_work); | |
999 | } | |
1000 | fail2: | |
1001 | if (pdata->enable) | |
1002 | pdata->enable(0); | |
1003 | if (pdata->release_resources) | |
1004 | pdata->release_resources(); | |
1005 | fail1: | |
1006 | kfree(chip); | |
1007 | return ret; | |
1008 | } | |
1009 | ||
1010 | static int lp5523_remove(struct i2c_client *client) | |
1011 | { | |
1012 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
1013 | int i; | |
1014 | ||
1015 | lp5523_unregister_sysfs(client); | |
1016 | ||
1017 | for (i = 0; i < chip->num_leds; i++) { | |
1018 | led_classdev_unregister(&chip->leds[i].cdev); | |
1019 | cancel_work_sync(&chip->leds[i].brightness_work); | |
1020 | } | |
1021 | ||
1022 | if (chip->pdata->enable) | |
1023 | chip->pdata->enable(0); | |
1024 | if (chip->pdata->release_resources) | |
1025 | chip->pdata->release_resources(); | |
1026 | kfree(chip); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static const struct i2c_device_id lp5523_id[] = { | |
1031 | { "lp5523", 0 }, | |
1032 | { } | |
1033 | }; | |
1034 | ||
1035 | MODULE_DEVICE_TABLE(i2c, lp5523_id); | |
1036 | ||
1037 | static struct i2c_driver lp5523_driver = { | |
1038 | .driver = { | |
1039 | .name = "lp5523", | |
1040 | }, | |
1041 | .probe = lp5523_probe, | |
1042 | .remove = lp5523_remove, | |
1043 | .id_table = lp5523_id, | |
1044 | }; | |
1045 | ||
1046 | static int __init lp5523_init(void) | |
1047 | { | |
1048 | int ret; | |
1049 | ||
1050 | ret = i2c_add_driver(&lp5523_driver); | |
1051 | ||
1052 | if (ret < 0) | |
1053 | printk(KERN_ALERT "Adding lp5523 driver failed\n"); | |
1054 | ||
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | static void __exit lp5523_exit(void) | |
1059 | { | |
1060 | i2c_del_driver(&lp5523_driver); | |
1061 | } | |
1062 | ||
1063 | module_init(lp5523_init); | |
1064 | module_exit(lp5523_exit); | |
1065 | ||
1066 | MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); | |
1067 | MODULE_DESCRIPTION("LP5523 LED engine"); | |
1068 | MODULE_LICENSE("GPL"); |