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a56ba8fb SA |
1 | /* |
2 | * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver | |
3 | * | |
4 | * Copyright (C) 2008-2011 Nokia Corporation | |
5 | * Copyright (c) 2011, 2017 Intel Corporation. | |
6 | * | |
7 | * Based on drivers/media/i2c/as3645a.c. | |
8 | * | |
9 | * Contact: Sakari Ailus <sakari.ailus@iki.fi> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * version 2 as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | */ | |
20 | ||
21 | #include <linux/delay.h> | |
22 | #include <linux/gpio/consumer.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/led-class-flash.h> | |
25 | #include <linux/leds.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/of.h> | |
29 | #include <linux/slab.h> | |
30 | ||
31 | #include <media/v4l2-flash-led-class.h> | |
32 | ||
33 | #define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50) | |
34 | #define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000) | |
35 | ||
36 | /* Register definitions */ | |
37 | ||
38 | /* Read-only Design info register: Reset state: xxxx 0001 */ | |
39 | #define AS_DESIGN_INFO_REG 0x00 | |
40 | #define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4)) | |
41 | #define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f) | |
42 | ||
43 | /* Read-only Version control register: Reset state: 0000 0000 | |
44 | * for first engineering samples | |
45 | */ | |
46 | #define AS_VERSION_CONTROL_REG 0x01 | |
47 | #define AS_VERSION_CONTROL_RFU(x) (((x) >> 4)) | |
48 | #define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f) | |
49 | ||
50 | /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */ | |
51 | #define AS_INDICATOR_AND_TIMER_REG 0x02 | |
52 | #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0 | |
53 | #define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4 | |
54 | #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6 | |
55 | ||
56 | /* Read / Write (Current set register): Reset state: 0110 1001 */ | |
57 | #define AS_CURRENT_SET_REG 0x03 | |
58 | #define AS_CURRENT_ASSIST_LIGHT_SHIFT 0 | |
59 | #define AS_CURRENT_LED_DET_ON (1 << 3) | |
60 | #define AS_CURRENT_FLASH_CURRENT_SHIFT 4 | |
61 | ||
62 | /* Read / Write (Control register): Reset state: 1011 0100 */ | |
63 | #define AS_CONTROL_REG 0x04 | |
64 | #define AS_CONTROL_MODE_SETTING_SHIFT 0 | |
65 | #define AS_CONTROL_STROBE_ON (1 << 2) | |
66 | #define AS_CONTROL_OUT_ON (1 << 3) | |
67 | #define AS_CONTROL_EXT_TORCH_ON (1 << 4) | |
68 | #define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5) | |
69 | #define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5) | |
70 | #define AS_CONTROL_COIL_PEAK_SHIFT 6 | |
71 | ||
72 | /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */ | |
73 | #define AS_FAULT_INFO_REG 0x05 | |
74 | #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1) | |
75 | #define AS_FAULT_INFO_INDICATOR_LED (1 << 2) | |
76 | #define AS_FAULT_INFO_LED_AMOUNT (1 << 3) | |
77 | #define AS_FAULT_INFO_TIMEOUT (1 << 4) | |
78 | #define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5) | |
79 | #define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6) | |
80 | #define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7) | |
81 | ||
82 | /* Boost register */ | |
83 | #define AS_BOOST_REG 0x0d | |
84 | #define AS_BOOST_CURRENT_DISABLE (0 << 0) | |
85 | #define AS_BOOST_CURRENT_ENABLE (1 << 0) | |
86 | ||
87 | /* Password register is used to unlock boost register writing */ | |
88 | #define AS_PASSWORD_REG 0x0f | |
89 | #define AS_PASSWORD_UNLOCK_VALUE 0x55 | |
90 | ||
91 | #define AS_NAME "as3645a" | |
92 | #define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */ | |
93 | ||
94 | #define AS_FLASH_TIMEOUT_MIN 100000 /* us */ | |
95 | #define AS_FLASH_TIMEOUT_MAX 850000 | |
96 | #define AS_FLASH_TIMEOUT_STEP 50000 | |
97 | ||
98 | #define AS_FLASH_INTENSITY_MIN 200000 /* uA */ | |
99 | #define AS_FLASH_INTENSITY_MAX_1LED 500000 | |
100 | #define AS_FLASH_INTENSITY_MAX_2LEDS 400000 | |
101 | #define AS_FLASH_INTENSITY_STEP 20000 | |
102 | ||
103 | #define AS_TORCH_INTENSITY_MIN 20000 /* uA */ | |
104 | #define AS_TORCH_INTENSITY_MAX 160000 | |
105 | #define AS_TORCH_INTENSITY_STEP 20000 | |
106 | ||
107 | #define AS_INDICATOR_INTENSITY_MIN 0 /* uA */ | |
108 | #define AS_INDICATOR_INTENSITY_MAX 10000 | |
109 | #define AS_INDICATOR_INTENSITY_STEP 2500 | |
110 | ||
111 | #define AS_PEAK_mA_MAX 2000 | |
112 | #define AS_PEAK_mA_TO_REG(a) \ | |
113 | ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250) | |
114 | ||
e626c325 SA |
115 | /* LED numbers for Devicetree */ |
116 | #define AS_LED_FLASH 0 | |
117 | #define AS_LED_INDICATOR 1 | |
118 | ||
a56ba8fb SA |
119 | enum as_mode { |
120 | AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT, | |
121 | AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT, | |
122 | AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT, | |
123 | AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT, | |
124 | }; | |
125 | ||
126 | struct as3645a_config { | |
127 | u32 flash_timeout_us; | |
128 | u32 flash_max_ua; | |
129 | u32 assist_max_ua; | |
130 | u32 indicator_max_ua; | |
131 | u32 voltage_reference; | |
132 | u32 peak; | |
133 | }; | |
134 | ||
135 | struct as3645a_names { | |
136 | char flash[32]; | |
137 | char indicator[32]; | |
138 | }; | |
139 | ||
140 | struct as3645a { | |
141 | struct i2c_client *client; | |
142 | ||
143 | struct mutex mutex; | |
144 | ||
145 | struct led_classdev_flash fled; | |
146 | struct led_classdev iled_cdev; | |
147 | ||
148 | struct v4l2_flash *vf; | |
149 | struct v4l2_flash *vfind; | |
150 | ||
151 | struct device_node *flash_node; | |
152 | struct device_node *indicator_node; | |
153 | ||
154 | struct as3645a_config cfg; | |
155 | ||
156 | enum as_mode mode; | |
157 | unsigned int timeout; | |
158 | unsigned int flash_current; | |
159 | unsigned int assist_current; | |
160 | unsigned int indicator_current; | |
161 | enum v4l2_flash_strobe_source strobe_source; | |
162 | }; | |
163 | ||
164 | #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled) | |
165 | #define iled_cdev_to_as3645a(__iled_cdev) \ | |
166 | container_of(__iled_cdev, struct as3645a, iled_cdev) | |
167 | ||
168 | /* Return negative errno else zero on success */ | |
169 | static int as3645a_write(struct as3645a *flash, u8 addr, u8 val) | |
170 | { | |
171 | struct i2c_client *client = flash->client; | |
172 | int rval; | |
173 | ||
174 | rval = i2c_smbus_write_byte_data(client, addr, val); | |
175 | ||
176 | dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val, | |
177 | rval < 0 ? "fail" : "ok"); | |
178 | ||
179 | return rval; | |
180 | } | |
181 | ||
182 | /* Return negative errno else a data byte received from the device. */ | |
183 | static int as3645a_read(struct as3645a *flash, u8 addr) | |
184 | { | |
185 | struct i2c_client *client = flash->client; | |
186 | int rval; | |
187 | ||
188 | rval = i2c_smbus_read_byte_data(client, addr); | |
189 | ||
190 | dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval, | |
191 | rval < 0 ? "fail" : "ok"); | |
192 | ||
193 | return rval; | |
194 | } | |
195 | ||
196 | /* ----------------------------------------------------------------------------- | |
197 | * Hardware configuration and trigger | |
198 | */ | |
199 | ||
200 | /** | |
201 | * as3645a_set_config - Set flash configuration registers | |
202 | * @flash: The flash | |
203 | * | |
204 | * Configure the hardware with flash, assist and indicator currents, as well as | |
205 | * flash timeout. | |
206 | * | |
207 | * Return 0 on success, or a negative error code if an I2C communication error | |
208 | * occurred. | |
209 | */ | |
210 | static int as3645a_set_current(struct as3645a *flash) | |
211 | { | |
212 | u8 val; | |
213 | ||
214 | val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT) | |
215 | | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT) | |
216 | | AS_CURRENT_LED_DET_ON; | |
217 | ||
218 | return as3645a_write(flash, AS_CURRENT_SET_REG, val); | |
219 | } | |
220 | ||
221 | static int as3645a_set_timeout(struct as3645a *flash) | |
222 | { | |
223 | u8 val; | |
224 | ||
225 | val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT; | |
226 | ||
227 | val |= (flash->cfg.voltage_reference | |
228 | << AS_INDICATOR_AND_TIMER_VREF_SHIFT) | |
229 | | ((flash->indicator_current ? flash->indicator_current - 1 : 0) | |
230 | << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT); | |
231 | ||
232 | return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val); | |
233 | } | |
234 | ||
235 | /** | |
236 | * as3645a_set_control - Set flash control register | |
237 | * @flash: The flash | |
238 | * @mode: Desired output mode | |
239 | * @on: Desired output state | |
240 | * | |
241 | * Configure the hardware with output mode and state. | |
242 | * | |
243 | * Return 0 on success, or a negative error code if an I2C communication error | |
244 | * occurred. | |
245 | */ | |
246 | static int | |
247 | as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on) | |
248 | { | |
249 | u8 reg; | |
250 | ||
251 | /* Configure output parameters and operation mode. */ | |
252 | reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT) | |
253 | | (on ? AS_CONTROL_OUT_ON : 0) | |
254 | | mode; | |
255 | ||
256 | if (mode == AS_MODE_FLASH && | |
257 | flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) | |
258 | reg |= AS_CONTROL_STROBE_TYPE_LEVEL | |
259 | | AS_CONTROL_STROBE_ON; | |
260 | ||
261 | return as3645a_write(flash, AS_CONTROL_REG, reg); | |
262 | } | |
263 | ||
264 | static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault) | |
265 | { | |
266 | struct as3645a *flash = fled_to_as3645a(fled); | |
267 | int rval; | |
268 | ||
269 | /* NOTE: reading register clears fault status */ | |
270 | rval = as3645a_read(flash, AS_FAULT_INFO_REG); | |
271 | if (rval < 0) | |
272 | return rval; | |
273 | ||
274 | if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) | |
275 | *fault |= LED_FAULT_OVER_CURRENT; | |
276 | ||
277 | if (rval & AS_FAULT_INFO_INDICATOR_LED) | |
278 | *fault |= LED_FAULT_INDICATOR; | |
279 | ||
280 | dev_dbg(&flash->client->dev, "%u connected LEDs\n", | |
281 | rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1); | |
282 | ||
283 | if (rval & AS_FAULT_INFO_TIMEOUT) | |
284 | *fault |= LED_FAULT_TIMEOUT; | |
285 | ||
286 | if (rval & AS_FAULT_INFO_OVER_TEMPERATURE) | |
287 | *fault |= LED_FAULT_OVER_TEMPERATURE; | |
288 | ||
289 | if (rval & AS_FAULT_INFO_SHORT_CIRCUIT) | |
290 | *fault |= LED_FAULT_OVER_CURRENT; | |
291 | ||
292 | if (rval & AS_FAULT_INFO_OVER_VOLTAGE) | |
293 | *fault |= LED_FAULT_INPUT_VOLTAGE; | |
294 | ||
295 | return rval; | |
296 | } | |
297 | ||
298 | static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max, | |
299 | unsigned int step, | |
300 | unsigned int val) | |
301 | { | |
302 | if (val < min) | |
303 | val = min; | |
304 | ||
305 | if (val > max) | |
306 | val = max; | |
307 | ||
308 | return (val - min) / step; | |
309 | } | |
310 | ||
311 | static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash, | |
312 | unsigned int ua) | |
313 | { | |
314 | if (is_flash) | |
315 | return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN, | |
316 | flash->cfg.assist_max_ua, | |
317 | AS_TORCH_INTENSITY_STEP, ua); | |
318 | else | |
319 | return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN, | |
320 | flash->cfg.flash_max_ua, | |
321 | AS_FLASH_INTENSITY_STEP, ua); | |
322 | } | |
323 | ||
324 | static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev, | |
325 | enum led_brightness brightness) | |
326 | { | |
327 | struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev); | |
328 | int rval; | |
329 | ||
330 | flash->indicator_current = brightness; | |
331 | ||
332 | rval = as3645a_set_timeout(flash); | |
333 | if (rval) | |
334 | return rval; | |
335 | ||
336 | return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness); | |
337 | } | |
338 | ||
339 | static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev, | |
340 | enum led_brightness brightness) | |
341 | { | |
342 | struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev); | |
343 | struct as3645a *flash = fled_to_as3645a(fled); | |
344 | int rval; | |
345 | ||
346 | if (brightness) { | |
347 | /* Register value 0 is 20 mA. */ | |
348 | flash->assist_current = brightness - 1; | |
349 | ||
350 | rval = as3645a_set_current(flash); | |
351 | if (rval) | |
352 | return rval; | |
353 | } | |
354 | ||
355 | return as3645a_set_control(flash, AS_MODE_ASSIST, brightness); | |
356 | } | |
357 | ||
358 | static int as3645a_set_flash_brightness(struct led_classdev_flash *fled, | |
359 | u32 brightness_ua) | |
360 | { | |
361 | struct as3645a *flash = fled_to_as3645a(fled); | |
362 | ||
6b68441b DM |
363 | flash->flash_current = as3645a_current_to_reg(flash, true, |
364 | brightness_ua); | |
a56ba8fb SA |
365 | |
366 | return as3645a_set_current(flash); | |
367 | } | |
368 | ||
369 | static int as3645a_set_flash_timeout(struct led_classdev_flash *fled, | |
370 | u32 timeout_us) | |
371 | { | |
372 | struct as3645a *flash = fled_to_as3645a(fled); | |
373 | ||
374 | flash->timeout = AS_TIMER_US_TO_CODE(timeout_us); | |
375 | ||
376 | return as3645a_set_timeout(flash); | |
377 | } | |
378 | ||
379 | static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state) | |
380 | { | |
381 | struct as3645a *flash = fled_to_as3645a(fled); | |
382 | ||
383 | return as3645a_set_control(flash, AS_MODE_FLASH, state); | |
384 | } | |
385 | ||
386 | static const struct led_flash_ops as3645a_led_flash_ops = { | |
387 | .flash_brightness_set = as3645a_set_flash_brightness, | |
388 | .timeout_set = as3645a_set_flash_timeout, | |
389 | .strobe_set = as3645a_set_strobe, | |
390 | .fault_get = as3645a_get_fault, | |
391 | }; | |
392 | ||
393 | static int as3645a_setup(struct as3645a *flash) | |
394 | { | |
395 | struct device *dev = &flash->client->dev; | |
396 | u32 fault = 0; | |
397 | int rval; | |
398 | ||
399 | /* clear errors */ | |
400 | rval = as3645a_read(flash, AS_FAULT_INFO_REG); | |
401 | if (rval < 0) | |
402 | return rval; | |
403 | ||
404 | dev_dbg(dev, "Fault info: %02x\n", rval); | |
405 | ||
406 | rval = as3645a_set_current(flash); | |
407 | if (rval < 0) | |
408 | return rval; | |
409 | ||
410 | rval = as3645a_set_timeout(flash); | |
411 | if (rval < 0) | |
412 | return rval; | |
413 | ||
414 | rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false); | |
415 | if (rval < 0) | |
416 | return rval; | |
417 | ||
418 | /* read status */ | |
419 | rval = as3645a_get_fault(&flash->fled, &fault); | |
420 | if (rval < 0) | |
421 | return rval; | |
422 | ||
423 | dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n", | |
424 | as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG)); | |
425 | dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n", | |
426 | as3645a_read(flash, AS_CURRENT_SET_REG)); | |
427 | dev_dbg(dev, "AS_CONTROL_REG: %02x\n", | |
428 | as3645a_read(flash, AS_CONTROL_REG)); | |
429 | ||
430 | return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0; | |
431 | } | |
432 | ||
433 | static int as3645a_detect(struct as3645a *flash) | |
434 | { | |
435 | struct device *dev = &flash->client->dev; | |
436 | int rval, man, model, rfu, version; | |
437 | const char *vendor; | |
438 | ||
439 | rval = as3645a_read(flash, AS_DESIGN_INFO_REG); | |
440 | if (rval < 0) { | |
441 | dev_err(dev, "can't read design info reg\n"); | |
442 | return rval; | |
443 | } | |
444 | ||
445 | man = AS_DESIGN_INFO_FACTORY(rval); | |
446 | model = AS_DESIGN_INFO_MODEL(rval); | |
447 | ||
448 | rval = as3645a_read(flash, AS_VERSION_CONTROL_REG); | |
449 | if (rval < 0) { | |
450 | dev_err(dev, "can't read version control reg\n"); | |
451 | return rval; | |
452 | } | |
453 | ||
454 | rfu = AS_VERSION_CONTROL_RFU(rval); | |
455 | version = AS_VERSION_CONTROL_VERSION(rval); | |
456 | ||
457 | /* Verify the chip model and version. */ | |
458 | if (model != 0x01 || rfu != 0x00) { | |
faa91a7b DM |
459 | dev_err(dev, "AS3645A not detected (model %d rfu %d)\n", |
460 | model, rfu); | |
a56ba8fb SA |
461 | return -ENODEV; |
462 | } | |
463 | ||
464 | switch (man) { | |
465 | case 1: | |
466 | vendor = "AMS, Austria Micro Systems"; | |
467 | break; | |
468 | case 2: | |
469 | vendor = "ADI, Analog Devices Inc."; | |
470 | break; | |
471 | case 3: | |
472 | vendor = "NSC, National Semiconductor"; | |
473 | break; | |
474 | case 4: | |
475 | vendor = "NXP"; | |
476 | break; | |
477 | case 5: | |
478 | vendor = "TI, Texas Instrument"; | |
479 | break; | |
480 | default: | |
481 | vendor = "Unknown"; | |
482 | } | |
483 | ||
484 | dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor, | |
485 | man, version); | |
486 | ||
487 | rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE); | |
488 | if (rval < 0) | |
489 | return rval; | |
490 | ||
491 | return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE); | |
492 | } | |
493 | ||
494 | static int as3645a_parse_node(struct as3645a *flash, | |
495 | struct as3645a_names *names, | |
496 | struct device_node *node) | |
497 | { | |
498 | struct as3645a_config *cfg = &flash->cfg; | |
e626c325 | 499 | struct device_node *child; |
a56ba8fb SA |
500 | const char *name; |
501 | int rval; | |
502 | ||
e626c325 SA |
503 | for_each_child_of_node(node, child) { |
504 | u32 id = 0; | |
505 | ||
506 | of_property_read_u32(child, "reg", &id); | |
507 | ||
508 | switch (id) { | |
509 | case AS_LED_FLASH: | |
510 | flash->flash_node = of_node_get(child); | |
511 | break; | |
512 | case AS_LED_INDICATOR: | |
513 | flash->indicator_node = of_node_get(child); | |
514 | break; | |
515 | default: | |
516 | dev_warn(&flash->client->dev, | |
517 | "unknown LED %u encountered, ignoring\n", id); | |
518 | break; | |
519 | } | |
520 | } | |
521 | ||
a56ba8fb SA |
522 | if (!flash->flash_node) { |
523 | dev_err(&flash->client->dev, "can't find flash node\n"); | |
524 | return -ENODEV; | |
525 | } | |
526 | ||
527 | rval = of_property_read_string(flash->flash_node, "label", &name); | |
528 | if (!rval) | |
529 | strlcpy(names->flash, name, sizeof(names->flash)); | |
530 | else | |
531 | snprintf(names->flash, sizeof(names->flash), | |
532 | "%s:flash", node->name); | |
533 | ||
534 | rval = of_property_read_u32(flash->flash_node, "flash-timeout-us", | |
535 | &cfg->flash_timeout_us); | |
536 | if (rval < 0) { | |
537 | dev_err(&flash->client->dev, | |
538 | "can't read flash-timeout-us property for flash\n"); | |
539 | goto out_err; | |
540 | } | |
541 | ||
542 | rval = of_property_read_u32(flash->flash_node, "flash-max-microamp", | |
543 | &cfg->flash_max_ua); | |
544 | if (rval < 0) { | |
545 | dev_err(&flash->client->dev, | |
546 | "can't read flash-max-microamp property for flash\n"); | |
547 | goto out_err; | |
548 | } | |
549 | ||
550 | rval = of_property_read_u32(flash->flash_node, "led-max-microamp", | |
551 | &cfg->assist_max_ua); | |
552 | if (rval < 0) { | |
553 | dev_err(&flash->client->dev, | |
554 | "can't read led-max-microamp property for flash\n"); | |
555 | goto out_err; | |
556 | } | |
557 | ||
558 | of_property_read_u32(flash->flash_node, "voltage-reference", | |
559 | &cfg->voltage_reference); | |
560 | ||
af2e658f | 561 | of_property_read_u32(flash->flash_node, "ams,input-max-microamp", |
a56ba8fb SA |
562 | &cfg->peak); |
563 | cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak); | |
564 | ||
a56ba8fb SA |
565 | if (!flash->indicator_node) { |
566 | dev_warn(&flash->client->dev, | |
567 | "can't find indicator node\n"); | |
568 | goto out_err; | |
569 | } | |
570 | ||
571 | rval = of_property_read_string(flash->indicator_node, "label", &name); | |
572 | if (!rval) | |
573 | strlcpy(names->indicator, name, sizeof(names->indicator)); | |
574 | else | |
575 | snprintf(names->indicator, sizeof(names->indicator), | |
576 | "%s:indicator", node->name); | |
577 | ||
578 | rval = of_property_read_u32(flash->indicator_node, "led-max-microamp", | |
579 | &cfg->indicator_max_ua); | |
580 | if (rval < 0) { | |
581 | dev_err(&flash->client->dev, | |
582 | "can't read led-max-microamp property for indicator\n"); | |
583 | goto out_err; | |
584 | } | |
585 | ||
586 | return 0; | |
587 | ||
588 | out_err: | |
589 | of_node_put(flash->flash_node); | |
590 | of_node_put(flash->indicator_node); | |
591 | ||
592 | return rval; | |
593 | } | |
594 | ||
595 | static int as3645a_led_class_setup(struct as3645a *flash, | |
596 | struct as3645a_names *names) | |
597 | { | |
598 | struct led_classdev *fled_cdev = &flash->fled.led_cdev; | |
599 | struct led_classdev *iled_cdev = &flash->iled_cdev; | |
600 | struct led_flash_setting *cfg; | |
601 | int rval; | |
602 | ||
603 | iled_cdev->name = names->indicator; | |
604 | iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness; | |
605 | iled_cdev->max_brightness = | |
606 | flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP; | |
607 | iled_cdev->flags = LED_CORE_SUSPENDRESUME; | |
608 | ||
609 | rval = led_classdev_register(&flash->client->dev, iled_cdev); | |
610 | if (rval < 0) | |
611 | return rval; | |
612 | ||
613 | cfg = &flash->fled.brightness; | |
614 | cfg->min = AS_FLASH_INTENSITY_MIN; | |
615 | cfg->max = flash->cfg.flash_max_ua; | |
616 | cfg->step = AS_FLASH_INTENSITY_STEP; | |
617 | cfg->val = flash->cfg.flash_max_ua; | |
618 | ||
619 | cfg = &flash->fled.timeout; | |
620 | cfg->min = AS_FLASH_TIMEOUT_MIN; | |
621 | cfg->max = flash->cfg.flash_timeout_us; | |
622 | cfg->step = AS_FLASH_TIMEOUT_STEP; | |
623 | cfg->val = flash->cfg.flash_timeout_us; | |
624 | ||
625 | flash->fled.ops = &as3645a_led_flash_ops; | |
626 | ||
627 | fled_cdev->name = names->flash; | |
628 | fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness; | |
629 | /* Value 0 is off in LED class. */ | |
630 | fled_cdev->max_brightness = | |
631 | as3645a_current_to_reg(flash, false, | |
632 | flash->cfg.assist_max_ua) + 1; | |
633 | fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME; | |
634 | ||
635 | rval = led_classdev_flash_register(&flash->client->dev, &flash->fled); | |
636 | if (rval) { | |
637 | led_classdev_unregister(iled_cdev); | |
638 | dev_err(&flash->client->dev, | |
639 | "led_classdev_flash_register() failed, error %d\n", | |
640 | rval); | |
641 | } | |
642 | ||
643 | return rval; | |
644 | } | |
645 | ||
646 | static int as3645a_v4l2_setup(struct as3645a *flash) | |
647 | { | |
648 | struct led_classdev_flash *fled = &flash->fled; | |
649 | struct led_classdev *led = &fled->led_cdev; | |
650 | struct v4l2_flash_config cfg = { | |
651 | .intensity = { | |
652 | .min = AS_TORCH_INTENSITY_MIN, | |
653 | .max = flash->cfg.assist_max_ua, | |
654 | .step = AS_TORCH_INTENSITY_STEP, | |
655 | .val = flash->cfg.assist_max_ua, | |
656 | }, | |
657 | }; | |
658 | struct v4l2_flash_config cfgind = { | |
659 | .intensity = { | |
660 | .min = AS_INDICATOR_INTENSITY_MIN, | |
661 | .max = flash->cfg.indicator_max_ua, | |
662 | .step = AS_INDICATOR_INTENSITY_STEP, | |
663 | .val = flash->cfg.indicator_max_ua, | |
664 | }, | |
665 | }; | |
666 | ||
667 | strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name)); | |
668 | strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name)); | |
669 | ||
670 | flash->vf = v4l2_flash_init( | |
671 | &flash->client->dev, of_fwnode_handle(flash->flash_node), | |
672 | &flash->fled, NULL, &cfg); | |
673 | if (IS_ERR(flash->vf)) | |
674 | return PTR_ERR(flash->vf); | |
675 | ||
676 | flash->vfind = v4l2_flash_indicator_init( | |
677 | &flash->client->dev, of_fwnode_handle(flash->indicator_node), | |
678 | &flash->iled_cdev, &cfgind); | |
679 | if (IS_ERR(flash->vfind)) { | |
680 | v4l2_flash_release(flash->vf); | |
681 | return PTR_ERR(flash->vfind); | |
682 | } | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | static int as3645a_probe(struct i2c_client *client) | |
688 | { | |
689 | struct as3645a_names names; | |
690 | struct as3645a *flash; | |
691 | int rval; | |
692 | ||
693 | if (client->dev.of_node == NULL) | |
694 | return -ENODEV; | |
695 | ||
696 | flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL); | |
697 | if (flash == NULL) | |
698 | return -ENOMEM; | |
699 | ||
700 | flash->client = client; | |
701 | ||
702 | rval = as3645a_parse_node(flash, &names, client->dev.of_node); | |
703 | if (rval < 0) | |
704 | return rval; | |
705 | ||
706 | rval = as3645a_detect(flash); | |
707 | if (rval < 0) | |
708 | goto out_put_nodes; | |
709 | ||
710 | mutex_init(&flash->mutex); | |
711 | i2c_set_clientdata(client, flash); | |
712 | ||
713 | rval = as3645a_setup(flash); | |
714 | if (rval) | |
715 | goto out_mutex_destroy; | |
716 | ||
717 | rval = as3645a_led_class_setup(flash, &names); | |
718 | if (rval) | |
719 | goto out_mutex_destroy; | |
720 | ||
721 | rval = as3645a_v4l2_setup(flash); | |
722 | if (rval) | |
723 | goto out_led_classdev_flash_unregister; | |
724 | ||
725 | return 0; | |
726 | ||
727 | out_led_classdev_flash_unregister: | |
728 | led_classdev_flash_unregister(&flash->fled); | |
729 | ||
730 | out_mutex_destroy: | |
731 | mutex_destroy(&flash->mutex); | |
732 | ||
733 | out_put_nodes: | |
734 | of_node_put(flash->flash_node); | |
735 | of_node_put(flash->indicator_node); | |
736 | ||
737 | return rval; | |
738 | } | |
739 | ||
740 | static int as3645a_remove(struct i2c_client *client) | |
741 | { | |
742 | struct as3645a *flash = i2c_get_clientdata(client); | |
743 | ||
744 | as3645a_set_control(flash, AS_MODE_EXT_TORCH, false); | |
745 | ||
746 | v4l2_flash_release(flash->vf); | |
12c4b878 | 747 | v4l2_flash_release(flash->vfind); |
a56ba8fb SA |
748 | |
749 | led_classdev_flash_unregister(&flash->fled); | |
750 | led_classdev_unregister(&flash->iled_cdev); | |
751 | ||
752 | mutex_destroy(&flash->mutex); | |
753 | ||
754 | of_node_put(flash->flash_node); | |
755 | of_node_put(flash->indicator_node); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | static const struct i2c_device_id as3645a_id_table[] = { | |
761 | { AS_NAME, 0 }, | |
762 | { }, | |
763 | }; | |
764 | MODULE_DEVICE_TABLE(i2c, as3645a_id_table); | |
765 | ||
766 | static const struct of_device_id as3645a_of_table[] = { | |
767 | { .compatible = "ams,as3645a" }, | |
768 | { }, | |
769 | }; | |
770 | MODULE_DEVICE_TABLE(of, as3645a_of_table); | |
771 | ||
772 | static struct i2c_driver as3645a_i2c_driver = { | |
773 | .driver = { | |
774 | .of_match_table = as3645a_of_table, | |
775 | .name = AS_NAME, | |
776 | }, | |
777 | .probe_new = as3645a_probe, | |
778 | .remove = as3645a_remove, | |
779 | .id_table = as3645a_id_table, | |
780 | }; | |
781 | ||
782 | module_i2c_driver(as3645a_i2c_driver); | |
783 | ||
784 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); | |
785 | MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>"); | |
786 | MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones"); | |
787 | MODULE_LICENSE("GPL v2"); |