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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 | ||
27d7704e KM |
107 | enum lp5523_chip_id { |
108 | LP5523, | |
109 | LP55231, | |
110 | }; | |
111 | ||
0efba16c | 112 | struct lp5523_engine { |
0efba16c SO |
113 | int id; |
114 | u8 mode; | |
115 | u8 prog_page; | |
116 | u8 mux_page; | |
117 | u16 led_mux; | |
118 | u8 engine_mask; | |
119 | }; | |
120 | ||
121 | struct lp5523_led { | |
122 | int id; | |
123 | u8 chan_nr; | |
124 | u8 led_current; | |
125 | u8 max_current; | |
126 | struct led_classdev cdev; | |
127 | struct work_struct brightness_work; | |
128 | u8 brightness; | |
129 | }; | |
130 | ||
131 | struct lp5523_chip { | |
132 | struct mutex lock; /* Serialize control */ | |
133 | struct i2c_client *client; | |
134 | struct lp5523_engine engines[LP5523_ENGINES]; | |
135 | struct lp5523_led leds[LP5523_LEDS]; | |
136 | struct lp5523_platform_data *pdata; | |
137 | u8 num_channels; | |
138 | u8 num_leds; | |
139 | }; | |
140 | ||
87dbf623 SO |
141 | static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev) |
142 | { | |
143 | return container_of(cdev, struct lp5523_led, cdev); | |
144 | } | |
0efba16c | 145 | |
87dbf623 | 146 | static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine) |
0efba16c SO |
147 | { |
148 | return container_of(engine, struct lp5523_chip, | |
149 | engines[engine->id - 1]); | |
150 | } | |
151 | ||
87dbf623 | 152 | static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led) |
0efba16c SO |
153 | { |
154 | return container_of(led, struct lp5523_chip, | |
155 | leds[led->id]); | |
156 | } | |
157 | ||
6f6365fb | 158 | static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode); |
0efba16c | 159 | static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode); |
d06cb46c | 160 | static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern); |
0efba16c SO |
161 | |
162 | static void lp5523_led_brightness_work(struct work_struct *work); | |
163 | ||
164 | static int lp5523_write(struct i2c_client *client, u8 reg, u8 value) | |
165 | { | |
166 | return i2c_smbus_write_byte_data(client, reg, value); | |
167 | } | |
168 | ||
169 | static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf) | |
170 | { | |
171 | s32 ret = i2c_smbus_read_byte_data(client, reg); | |
172 | ||
173 | if (ret < 0) | |
174 | return -EIO; | |
175 | ||
176 | *buf = ret; | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static int lp5523_detect(struct i2c_client *client) | |
181 | { | |
182 | int ret; | |
183 | u8 buf; | |
184 | ||
469eba02 | 185 | ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); |
0efba16c SO |
186 | if (ret) |
187 | return ret; | |
188 | ret = lp5523_read(client, LP5523_REG_ENABLE, &buf); | |
189 | if (ret) | |
190 | return ret; | |
191 | if (buf == 0x40) | |
192 | return 0; | |
193 | else | |
194 | return -ENODEV; | |
195 | } | |
196 | ||
197 | static int lp5523_configure(struct i2c_client *client) | |
198 | { | |
199 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
200 | int ret = 0; | |
201 | u8 status; | |
202 | ||
203 | /* one pattern per engine setting led mux start and stop addresses */ | |
d06cb46c | 204 | static const u8 pattern[][LP5523_PROGRAM_LENGTH] = { |
0efba16c SO |
205 | { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0}, |
206 | { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0}, | |
207 | { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, | |
208 | }; | |
209 | ||
0efba16c | 210 | ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); |
2e4840ed SO |
211 | /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ |
212 | usleep_range(1000, 2000); | |
0efba16c SO |
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 | ||
2e4840ed SO |
249 | /* Let the programs run for couple of ms and check the engine status */ |
250 | usleep_range(3000, 6000); | |
0efba16c SO |
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 | ||
d06cb46c | 309 | static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern) |
0efba16c SO |
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; | |
469eba02 KM |
346 | |
347 | len = min_t(int, len, LP5523_LEDS); | |
0efba16c SO |
348 | for (i = 0; i < len; i++) { |
349 | switch (buf[i]) { | |
350 | case '1': | |
351 | tmp_mux |= (1 << i); | |
352 | break; | |
353 | case '0': | |
354 | break; | |
355 | case '\n': | |
356 | i = len; | |
357 | break; | |
358 | default: | |
359 | return -1; | |
360 | } | |
361 | } | |
362 | *mux = tmp_mux; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static void lp5523_mux_to_array(u16 led_mux, char *array) | |
368 | { | |
369 | int i, pos = 0; | |
370 | for (i = 0; i < LP5523_LEDS; i++) | |
371 | pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i)); | |
372 | ||
373 | array[pos] = '\0'; | |
374 | } | |
375 | ||
376 | /*--------------------------------------------------------------*/ | |
377 | /* Sysfs interface */ | |
378 | /*--------------------------------------------------------------*/ | |
379 | ||
380 | static ssize_t show_engine_leds(struct device *dev, | |
381 | struct device_attribute *attr, | |
382 | char *buf, int nr) | |
383 | { | |
384 | struct i2c_client *client = to_i2c_client(dev); | |
385 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
386 | char mux[LP5523_LEDS + 1]; | |
387 | ||
388 | lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux); | |
389 | ||
390 | return sprintf(buf, "%s\n", mux); | |
391 | } | |
392 | ||
393 | #define show_leds(nr) \ | |
394 | static ssize_t show_engine##nr##_leds(struct device *dev, \ | |
395 | struct device_attribute *attr, \ | |
396 | char *buf) \ | |
397 | { \ | |
398 | return show_engine_leds(dev, attr, buf, nr); \ | |
399 | } | |
400 | show_leds(1) | |
401 | show_leds(2) | |
402 | show_leds(3) | |
403 | ||
404 | static ssize_t store_engine_leds(struct device *dev, | |
405 | struct device_attribute *attr, | |
406 | const char *buf, size_t len, int nr) | |
407 | { | |
408 | struct i2c_client *client = to_i2c_client(dev); | |
409 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
410 | u16 mux = 0; | |
fbac0812 | 411 | ssize_t ret; |
0efba16c SO |
412 | |
413 | if (lp5523_mux_parse(buf, &mux, len)) | |
414 | return -EINVAL; | |
415 | ||
fbac0812 SO |
416 | mutex_lock(&chip->lock); |
417 | ret = -EINVAL; | |
418 | if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD) | |
419 | goto leave; | |
420 | ||
0efba16c | 421 | if (lp5523_load_mux(&chip->engines[nr - 1], mux)) |
fbac0812 | 422 | goto leave; |
0efba16c | 423 | |
fbac0812 SO |
424 | ret = len; |
425 | leave: | |
426 | mutex_unlock(&chip->lock); | |
427 | return ret; | |
0efba16c SO |
428 | } |
429 | ||
430 | #define store_leds(nr) \ | |
431 | static ssize_t store_engine##nr##_leds(struct device *dev, \ | |
432 | struct device_attribute *attr, \ | |
433 | const char *buf, size_t len) \ | |
434 | { \ | |
435 | return store_engine_leds(dev, attr, buf, len, nr); \ | |
436 | } | |
437 | store_leds(1) | |
438 | store_leds(2) | |
439 | store_leds(3) | |
440 | ||
441 | static ssize_t lp5523_selftest(struct device *dev, | |
442 | struct device_attribute *attr, | |
443 | char *buf) | |
444 | { | |
445 | struct i2c_client *client = to_i2c_client(dev); | |
446 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
447 | int i, ret, pos = 0; | |
448 | int led = 0; | |
449 | u8 status, adc, vdd; | |
450 | ||
451 | mutex_lock(&chip->lock); | |
452 | ||
453 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); | |
454 | if (ret < 0) | |
455 | goto fail; | |
456 | ||
457 | /* Check that ext clock is really in use if requested */ | |
458 | if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT)) | |
459 | if ((status & LP5523_EXT_CLK_USED) == 0) | |
460 | goto fail; | |
461 | ||
462 | /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */ | |
463 | lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL, | |
464 | LP5523_EN_LEDTEST | 16); | |
2e4840ed | 465 | usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */ |
0efba16c SO |
466 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
467 | if (!(status & LP5523_LEDTEST_DONE)) | |
2e4840ed | 468 | usleep_range(3000, 6000); /* Was not ready. Wait little bit */ |
0efba16c SO |
469 | |
470 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd); | |
471 | vdd--; /* There may be some fluctuation in measurement */ | |
472 | ||
473 | for (i = 0; i < LP5523_LEDS; i++) { | |
474 | /* Skip non-existing channels */ | |
475 | if (chip->pdata->led_config[i].led_current == 0) | |
476 | continue; | |
477 | ||
478 | /* Set default current */ | |
479 | lp5523_write(chip->client, | |
480 | LP5523_REG_LED_CURRENT_BASE + i, | |
481 | chip->pdata->led_config[i].led_current); | |
482 | ||
483 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff); | |
2e4840ed SO |
484 | /* let current stabilize 2 - 4ms before measurements start */ |
485 | usleep_range(2000, 4000); | |
0efba16c SO |
486 | lp5523_write(chip->client, |
487 | LP5523_REG_LED_TEST_CTRL, | |
488 | LP5523_EN_LEDTEST | i); | |
2e4840ed SO |
489 | /* ADC conversion time is 2.7 ms typically */ |
490 | usleep_range(3000, 6000); | |
0efba16c SO |
491 | ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status); |
492 | if (!(status & LP5523_LEDTEST_DONE)) | |
2e4840ed | 493 | usleep_range(3000, 6000);/* Was not ready. Wait. */ |
0efba16c SO |
494 | ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc); |
495 | ||
496 | if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM) | |
497 | pos += sprintf(buf + pos, "LED %d FAIL\n", i); | |
498 | ||
499 | lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00); | |
500 | ||
501 | /* Restore current */ | |
502 | lp5523_write(chip->client, | |
503 | LP5523_REG_LED_CURRENT_BASE + i, | |
504 | chip->leds[led].led_current); | |
505 | led++; | |
506 | } | |
507 | if (pos == 0) | |
508 | pos = sprintf(buf, "OK\n"); | |
509 | goto release_lock; | |
510 | fail: | |
511 | pos = sprintf(buf, "FAIL\n"); | |
512 | ||
513 | release_lock: | |
514 | mutex_unlock(&chip->lock); | |
515 | ||
516 | return pos; | |
517 | } | |
518 | ||
519 | static void lp5523_set_brightness(struct led_classdev *cdev, | |
520 | enum led_brightness brightness) | |
521 | { | |
522 | struct lp5523_led *led = cdev_to_led(cdev); | |
523 | ||
524 | led->brightness = (u8)brightness; | |
525 | ||
526 | schedule_work(&led->brightness_work); | |
527 | } | |
528 | ||
529 | static void lp5523_led_brightness_work(struct work_struct *work) | |
530 | { | |
531 | struct lp5523_led *led = container_of(work, | |
532 | struct lp5523_led, | |
533 | brightness_work); | |
534 | struct lp5523_chip *chip = led_to_lp5523(led); | |
535 | struct i2c_client *client = chip->client; | |
536 | ||
537 | mutex_lock(&chip->lock); | |
538 | ||
539 | lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr, | |
540 | led->brightness); | |
541 | ||
542 | mutex_unlock(&chip->lock); | |
543 | } | |
544 | ||
545 | static int lp5523_do_store_load(struct lp5523_engine *engine, | |
546 | const char *buf, size_t len) | |
547 | { | |
548 | struct lp5523_chip *chip = engine_to_lp5523(engine); | |
549 | struct i2c_client *client = chip->client; | |
550 | int ret, nrchars, offset = 0, i = 0; | |
551 | char c[3]; | |
552 | unsigned cmd; | |
553 | u8 pattern[LP5523_PROGRAM_LENGTH] = {0}; | |
554 | ||
469eba02 KM |
555 | if (engine->mode != LP5523_CMD_LOAD) |
556 | return -EINVAL; | |
557 | ||
0efba16c SO |
558 | while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) { |
559 | /* separate sscanfs because length is working only for %s */ | |
560 | ret = sscanf(buf + offset, "%2s%n ", c, &nrchars); | |
561 | ret = sscanf(c, "%2x", &cmd); | |
562 | if (ret != 1) | |
563 | goto fail; | |
564 | pattern[i] = (u8)cmd; | |
565 | ||
566 | offset += nrchars; | |
567 | i++; | |
568 | } | |
569 | ||
570 | /* Each instruction is 16bit long. Check that length is even */ | |
571 | if (i % 2) | |
572 | goto fail; | |
573 | ||
574 | mutex_lock(&chip->lock); | |
469eba02 | 575 | ret = lp5523_load_program(engine, pattern); |
0efba16c SO |
576 | mutex_unlock(&chip->lock); |
577 | ||
578 | if (ret) { | |
579 | dev_err(&client->dev, "failed loading pattern\n"); | |
580 | return ret; | |
581 | } | |
582 | ||
583 | return len; | |
584 | fail: | |
585 | dev_err(&client->dev, "wrong pattern format\n"); | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | static ssize_t store_engine_load(struct device *dev, | |
590 | struct device_attribute *attr, | |
591 | const char *buf, size_t len, int nr) | |
592 | { | |
593 | struct i2c_client *client = to_i2c_client(dev); | |
594 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
595 | return lp5523_do_store_load(&chip->engines[nr - 1], buf, len); | |
596 | } | |
597 | ||
598 | #define store_load(nr) \ | |
599 | static ssize_t store_engine##nr##_load(struct device *dev, \ | |
600 | struct device_attribute *attr, \ | |
601 | const char *buf, size_t len) \ | |
602 | { \ | |
603 | return store_engine_load(dev, attr, buf, len, nr); \ | |
604 | } | |
605 | store_load(1) | |
606 | store_load(2) | |
607 | store_load(3) | |
608 | ||
609 | static ssize_t show_engine_mode(struct device *dev, | |
610 | struct device_attribute *attr, | |
611 | char *buf, int nr) | |
612 | { | |
613 | struct i2c_client *client = to_i2c_client(dev); | |
614 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
615 | switch (chip->engines[nr - 1].mode) { | |
616 | case LP5523_CMD_RUN: | |
617 | return sprintf(buf, "run\n"); | |
618 | case LP5523_CMD_LOAD: | |
619 | return sprintf(buf, "load\n"); | |
620 | case LP5523_CMD_DISABLED: | |
621 | return sprintf(buf, "disabled\n"); | |
622 | default: | |
623 | return sprintf(buf, "disabled\n"); | |
624 | } | |
625 | } | |
626 | ||
627 | #define show_mode(nr) \ | |
628 | static ssize_t show_engine##nr##_mode(struct device *dev, \ | |
629 | struct device_attribute *attr, \ | |
630 | char *buf) \ | |
631 | { \ | |
632 | return show_engine_mode(dev, attr, buf, nr); \ | |
633 | } | |
634 | show_mode(1) | |
635 | show_mode(2) | |
636 | show_mode(3) | |
637 | ||
638 | static ssize_t store_engine_mode(struct device *dev, | |
639 | struct device_attribute *attr, | |
640 | const char *buf, size_t len, int nr) | |
641 | { | |
642 | struct i2c_client *client = to_i2c_client(dev); | |
643 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
644 | struct lp5523_engine *engine = &chip->engines[nr - 1]; | |
645 | mutex_lock(&chip->lock); | |
646 | ||
647 | if (!strncmp(buf, "run", 3)) | |
648 | lp5523_set_mode(engine, LP5523_CMD_RUN); | |
649 | else if (!strncmp(buf, "load", 4)) | |
650 | lp5523_set_mode(engine, LP5523_CMD_LOAD); | |
651 | else if (!strncmp(buf, "disabled", 8)) | |
652 | lp5523_set_mode(engine, LP5523_CMD_DISABLED); | |
653 | ||
654 | mutex_unlock(&chip->lock); | |
655 | return len; | |
656 | } | |
657 | ||
658 | #define store_mode(nr) \ | |
659 | static ssize_t store_engine##nr##_mode(struct device *dev, \ | |
660 | struct device_attribute *attr, \ | |
661 | const char *buf, size_t len) \ | |
662 | { \ | |
663 | return store_engine_mode(dev, attr, buf, len, nr); \ | |
664 | } | |
665 | store_mode(1) | |
666 | store_mode(2) | |
667 | store_mode(3) | |
668 | ||
669 | static ssize_t show_max_current(struct device *dev, | |
670 | struct device_attribute *attr, | |
671 | char *buf) | |
672 | { | |
673 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
674 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
675 | ||
676 | return sprintf(buf, "%d\n", led->max_current); | |
677 | } | |
678 | ||
679 | static ssize_t show_current(struct device *dev, | |
680 | struct device_attribute *attr, | |
681 | char *buf) | |
682 | { | |
683 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
684 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
685 | ||
686 | return sprintf(buf, "%d\n", led->led_current); | |
687 | } | |
688 | ||
689 | static ssize_t store_current(struct device *dev, | |
690 | struct device_attribute *attr, | |
691 | const char *buf, size_t len) | |
692 | { | |
693 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
694 | struct lp5523_led *led = cdev_to_led(led_cdev); | |
695 | struct lp5523_chip *chip = led_to_lp5523(led); | |
696 | ssize_t ret; | |
697 | unsigned long curr; | |
698 | ||
699 | if (strict_strtoul(buf, 0, &curr)) | |
700 | return -EINVAL; | |
701 | ||
702 | if (curr > led->max_current) | |
703 | return -EINVAL; | |
704 | ||
705 | mutex_lock(&chip->lock); | |
706 | ret = lp5523_write(chip->client, | |
707 | LP5523_REG_LED_CURRENT_BASE + led->chan_nr, | |
708 | (u8)curr); | |
709 | mutex_unlock(&chip->lock); | |
710 | ||
711 | if (ret < 0) | |
712 | return ret; | |
713 | ||
714 | led->led_current = (u8)curr; | |
715 | ||
716 | return len; | |
717 | } | |
718 | ||
719 | /* led class device attributes */ | |
ccd7510f | 720 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current); |
0efba16c SO |
721 | static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL); |
722 | ||
723 | static struct attribute *lp5523_led_attributes[] = { | |
724 | &dev_attr_led_current.attr, | |
725 | &dev_attr_max_current.attr, | |
726 | NULL, | |
727 | }; | |
728 | ||
729 | static struct attribute_group lp5523_led_attribute_group = { | |
730 | .attrs = lp5523_led_attributes | |
731 | }; | |
732 | ||
733 | /* device attributes */ | |
ccd7510f | 734 | static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR, |
0efba16c | 735 | show_engine1_mode, store_engine1_mode); |
ccd7510f | 736 | static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR, |
0efba16c | 737 | show_engine2_mode, store_engine2_mode); |
ccd7510f | 738 | static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR, |
0efba16c | 739 | show_engine3_mode, store_engine3_mode); |
ccd7510f | 740 | static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR, |
0efba16c | 741 | show_engine1_leds, store_engine1_leds); |
ccd7510f | 742 | static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR, |
0efba16c | 743 | show_engine2_leds, store_engine2_leds); |
ccd7510f | 744 | static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR, |
0efba16c | 745 | show_engine3_leds, store_engine3_leds); |
ccd7510f VK |
746 | static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load); |
747 | static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load); | |
748 | static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load); | |
0efba16c SO |
749 | static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL); |
750 | ||
751 | static struct attribute *lp5523_attributes[] = { | |
752 | &dev_attr_engine1_mode.attr, | |
753 | &dev_attr_engine2_mode.attr, | |
754 | &dev_attr_engine3_mode.attr, | |
755 | &dev_attr_selftest.attr, | |
0efba16c SO |
756 | &dev_attr_engine1_load.attr, |
757 | &dev_attr_engine1_leds.attr, | |
0efba16c SO |
758 | &dev_attr_engine2_load.attr, |
759 | &dev_attr_engine2_leds.attr, | |
0efba16c SO |
760 | &dev_attr_engine3_load.attr, |
761 | &dev_attr_engine3_leds.attr, | |
f1625842 | 762 | NULL, |
0efba16c SO |
763 | }; |
764 | ||
765 | static const struct attribute_group lp5523_group = { | |
766 | .attrs = lp5523_attributes, | |
767 | }; | |
768 | ||
0efba16c SO |
769 | static int lp5523_register_sysfs(struct i2c_client *client) |
770 | { | |
771 | struct device *dev = &client->dev; | |
772 | int ret; | |
773 | ||
774 | ret = sysfs_create_group(&dev->kobj, &lp5523_group); | |
775 | if (ret < 0) | |
776 | return ret; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | static void lp5523_unregister_sysfs(struct i2c_client *client) | |
782 | { | |
783 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
784 | struct device *dev = &client->dev; | |
785 | int i; | |
786 | ||
787 | sysfs_remove_group(&dev->kobj, &lp5523_group); | |
788 | ||
0efba16c SO |
789 | for (i = 0; i < chip->num_leds; i++) |
790 | sysfs_remove_group(&chip->leds[i].cdev.dev->kobj, | |
791 | &lp5523_led_attribute_group); | |
792 | } | |
793 | ||
794 | /*--------------------------------------------------------------*/ | |
795 | /* Set chip operating mode */ | |
796 | /*--------------------------------------------------------------*/ | |
6f6365fb | 797 | static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode) |
0efba16c | 798 | { |
0efba16c SO |
799 | /* if in that mode already do nothing, except for run */ |
800 | if (mode == engine->mode && mode != LP5523_CMD_RUN) | |
6f6365fb | 801 | return; |
0efba16c | 802 | |
6f6365fb KM |
803 | switch (mode) { |
804 | case LP5523_CMD_RUN: | |
805 | lp5523_run_program(engine); | |
806 | break; | |
807 | case LP5523_CMD_LOAD: | |
0efba16c SO |
808 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
809 | lp5523_set_engine_mode(engine, LP5523_CMD_LOAD); | |
6f6365fb KM |
810 | break; |
811 | case LP5523_CMD_DISABLED: | |
0efba16c | 812 | lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED); |
6f6365fb KM |
813 | break; |
814 | default: | |
815 | return; | |
0efba16c SO |
816 | } |
817 | ||
0efba16c | 818 | engine->mode = mode; |
0efba16c SO |
819 | } |
820 | ||
821 | /*--------------------------------------------------------------*/ | |
822 | /* Probe, Attach, Remove */ | |
823 | /*--------------------------------------------------------------*/ | |
824 | static int __init lp5523_init_engine(struct lp5523_engine *engine, int id) | |
825 | { | |
826 | if (id < 1 || id > LP5523_ENGINES) | |
827 | return -1; | |
828 | engine->id = id; | |
829 | engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id); | |
830 | engine->prog_page = id - 1; | |
831 | engine->mux_page = id + 2; | |
0efba16c SO |
832 | |
833 | return 0; | |
834 | } | |
835 | ||
33721bd3 | 836 | static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev, |
56a1e9ad KM |
837 | int chan, struct lp5523_platform_data *pdata, |
838 | const char *chip_name) | |
0efba16c SO |
839 | { |
840 | char name[32]; | |
841 | int res; | |
842 | ||
843 | if (chan >= LP5523_LEDS) | |
844 | return -EINVAL; | |
845 | ||
846 | if (pdata->led_config[chan].led_current) { | |
847 | led->led_current = pdata->led_config[chan].led_current; | |
848 | led->max_current = pdata->led_config[chan].max_current; | |
849 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
850 | ||
851 | if (led->chan_nr >= LP5523_LEDS) { | |
852 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
853 | LP5523_LEDS - 1); | |
854 | return -EINVAL; | |
855 | } | |
856 | ||
94b43b67 KM |
857 | if (pdata->led_config[chan].name) { |
858 | led->cdev.name = pdata->led_config[chan].name; | |
859 | } else { | |
860 | snprintf(name, sizeof(name), "%s:channel%d", | |
56a1e9ad | 861 | pdata->label ? : chip_name, chan); |
94b43b67 KM |
862 | led->cdev.name = name; |
863 | } | |
0efba16c | 864 | |
0efba16c SO |
865 | led->cdev.brightness_set = lp5523_set_brightness; |
866 | res = led_classdev_register(dev, &led->cdev); | |
867 | if (res < 0) { | |
868 | dev_err(dev, "couldn't register led on channel %d\n", | |
869 | chan); | |
870 | return res; | |
871 | } | |
872 | res = sysfs_create_group(&led->cdev.dev->kobj, | |
873 | &lp5523_led_attribute_group); | |
874 | if (res < 0) { | |
875 | dev_err(dev, "couldn't register current attribute\n"); | |
876 | led_classdev_unregister(&led->cdev); | |
877 | return res; | |
878 | } | |
879 | } else { | |
880 | led->led_current = 0; | |
881 | } | |
882 | return 0; | |
883 | } | |
884 | ||
33721bd3 | 885 | static int __devinit lp5523_probe(struct i2c_client *client, |
0efba16c SO |
886 | const struct i2c_device_id *id) |
887 | { | |
888 | struct lp5523_chip *chip; | |
889 | struct lp5523_platform_data *pdata; | |
890 | int ret, i, led; | |
891 | ||
94ca4bcc | 892 | chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); |
0efba16c SO |
893 | if (!chip) |
894 | return -ENOMEM; | |
895 | ||
896 | i2c_set_clientdata(client, chip); | |
897 | chip->client = client; | |
898 | ||
899 | pdata = client->dev.platform_data; | |
900 | ||
901 | if (!pdata) { | |
902 | dev_err(&client->dev, "no platform data\n"); | |
94ca4bcc | 903 | return -EINVAL; |
0efba16c SO |
904 | } |
905 | ||
906 | mutex_init(&chip->lock); | |
907 | ||
908 | chip->pdata = pdata; | |
909 | ||
910 | if (pdata->setup_resources) { | |
911 | ret = pdata->setup_resources(); | |
912 | if (ret < 0) | |
94ca4bcc | 913 | return ret; |
0efba16c SO |
914 | } |
915 | ||
916 | if (pdata->enable) { | |
917 | pdata->enable(0); | |
2e4840ed | 918 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
0efba16c | 919 | pdata->enable(1); |
2e4840ed | 920 | usleep_range(1000, 2000); /* 500us abs min. */ |
0efba16c SO |
921 | } |
922 | ||
11e7946f SO |
923 | lp5523_write(client, LP5523_REG_RESET, 0xff); |
924 | usleep_range(10000, 20000); /* | |
925 | * Exact value is not available. 10 - 20ms | |
926 | * appears to be enough for reset. | |
927 | */ | |
0efba16c SO |
928 | ret = lp5523_detect(client); |
929 | if (ret) | |
94ca4bcc | 930 | goto fail1; |
0efba16c | 931 | |
56a1e9ad | 932 | dev_info(&client->dev, "%s Programmable led chip found\n", id->name); |
0efba16c SO |
933 | |
934 | /* Initialize engines */ | |
935 | for (i = 0; i < ARRAY_SIZE(chip->engines); i++) { | |
936 | ret = lp5523_init_engine(&chip->engines[i], i + 1); | |
937 | if (ret) { | |
938 | dev_err(&client->dev, "error initializing engine\n"); | |
94ca4bcc | 939 | goto fail1; |
0efba16c SO |
940 | } |
941 | } | |
942 | ret = lp5523_configure(client); | |
943 | if (ret < 0) { | |
944 | dev_err(&client->dev, "error configuring chip\n"); | |
94ca4bcc | 945 | goto fail1; |
0efba16c SO |
946 | } |
947 | ||
948 | /* Initialize leds */ | |
949 | chip->num_channels = pdata->num_channels; | |
950 | chip->num_leds = 0; | |
951 | led = 0; | |
952 | for (i = 0; i < pdata->num_channels; i++) { | |
953 | /* Do not initialize channels that are not connected */ | |
954 | if (pdata->led_config[i].led_current == 0) | |
955 | continue; | |
956 | ||
5391dd0a DC |
957 | INIT_WORK(&chip->leds[led].brightness_work, |
958 | lp5523_led_brightness_work); | |
959 | ||
56a1e9ad KM |
960 | ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata, |
961 | id->name); | |
0efba16c SO |
962 | if (ret) { |
963 | dev_err(&client->dev, "error initializing leds\n"); | |
94ca4bcc | 964 | goto fail2; |
0efba16c SO |
965 | } |
966 | chip->num_leds++; | |
967 | ||
968 | chip->leds[led].id = led; | |
969 | /* Set LED current */ | |
970 | lp5523_write(client, | |
971 | LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr, | |
972 | chip->leds[led].led_current); | |
973 | ||
0efba16c SO |
974 | led++; |
975 | } | |
976 | ||
977 | ret = lp5523_register_sysfs(client); | |
978 | if (ret) { | |
979 | dev_err(&client->dev, "registering sysfs failed\n"); | |
94ca4bcc | 980 | goto fail2; |
0efba16c SO |
981 | } |
982 | return ret; | |
94ca4bcc | 983 | fail2: |
0efba16c SO |
984 | for (i = 0; i < chip->num_leds; i++) { |
985 | led_classdev_unregister(&chip->leds[i].cdev); | |
a39b9854 | 986 | flush_work(&chip->leds[i].brightness_work); |
0efba16c | 987 | } |
94ca4bcc | 988 | fail1: |
0efba16c SO |
989 | if (pdata->enable) |
990 | pdata->enable(0); | |
991 | if (pdata->release_resources) | |
992 | pdata->release_resources(); | |
0efba16c SO |
993 | return ret; |
994 | } | |
995 | ||
996 | static int lp5523_remove(struct i2c_client *client) | |
997 | { | |
998 | struct lp5523_chip *chip = i2c_get_clientdata(client); | |
999 | int i; | |
1000 | ||
23301b7f KM |
1001 | /* Disable engine mode */ |
1002 | lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED); | |
1003 | ||
0efba16c SO |
1004 | lp5523_unregister_sysfs(client); |
1005 | ||
1006 | for (i = 0; i < chip->num_leds; i++) { | |
1007 | led_classdev_unregister(&chip->leds[i].cdev); | |
a39b9854 | 1008 | flush_work(&chip->leds[i].brightness_work); |
0efba16c SO |
1009 | } |
1010 | ||
1011 | if (chip->pdata->enable) | |
1012 | chip->pdata->enable(0); | |
1013 | if (chip->pdata->release_resources) | |
1014 | chip->pdata->release_resources(); | |
0efba16c SO |
1015 | return 0; |
1016 | } | |
1017 | ||
1018 | static const struct i2c_device_id lp5523_id[] = { | |
27d7704e KM |
1019 | { "lp5523", LP5523 }, |
1020 | { "lp55231", LP55231 }, | |
0efba16c SO |
1021 | { } |
1022 | }; | |
1023 | ||
1024 | MODULE_DEVICE_TABLE(i2c, lp5523_id); | |
1025 | ||
1026 | static struct i2c_driver lp5523_driver = { | |
1027 | .driver = { | |
27d7704e | 1028 | .name = "lp5523x", |
0efba16c SO |
1029 | }, |
1030 | .probe = lp5523_probe, | |
1031 | .remove = lp5523_remove, | |
1032 | .id_table = lp5523_id, | |
1033 | }; | |
1034 | ||
09a0d183 | 1035 | module_i2c_driver(lp5523_driver); |
0efba16c SO |
1036 | |
1037 | MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>"); | |
1038 | MODULE_DESCRIPTION("LP5523 LED engine"); | |
1039 | MODULE_LICENSE("GPL"); |