1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver |
4 | * |
5 | * Copyright (C) 2008-2011 Nokia Corporation |
6 | * Copyright (c) 2011, 2017 Intel Corporation. |
7 | * |
8 | * Based on drivers/media/i2c/as3645a.c. |
9 | * |
10 | * Contact: Sakari Ailus <sakari.ailus@iki.fi> |
11 | */ |
12 | |
13 | #include <linux/delay.h> |
14 | #include <linux/gpio/consumer.h> |
15 | #include <linux/i2c.h> |
16 | #include <linux/led-class-flash.h> |
17 | #include <linux/leds.h> |
18 | #include <linux/module.h> |
19 | #include <linux/mutex.h> |
20 | #include <linux/property.h> |
21 | #include <linux/slab.h> |
22 | |
23 | #include <media/v4l2-flash-led-class.h> |
24 | |
25 | #define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50) |
26 | #define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000) |
27 | |
28 | /* Register definitions */ |
29 | |
30 | /* Read-only Design info register: Reset state: xxxx 0001 */ |
31 | #define AS_DESIGN_INFO_REG 0x00 |
32 | #define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4)) |
33 | #define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f) |
34 | |
35 | /* Read-only Version control register: Reset state: 0000 0000 |
36 | * for first engineering samples |
37 | */ |
38 | #define AS_VERSION_CONTROL_REG 0x01 |
39 | #define AS_VERSION_CONTROL_RFU(x) (((x) >> 4)) |
40 | #define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f) |
41 | |
42 | /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */ |
43 | #define AS_INDICATOR_AND_TIMER_REG 0x02 |
44 | #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0 |
45 | #define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4 |
46 | #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6 |
47 | |
48 | /* Read / Write (Current set register): Reset state: 0110 1001 */ |
49 | #define AS_CURRENT_SET_REG 0x03 |
50 | #define AS_CURRENT_ASSIST_LIGHT_SHIFT 0 |
51 | #define AS_CURRENT_LED_DET_ON (1 << 3) |
52 | #define AS_CURRENT_FLASH_CURRENT_SHIFT 4 |
53 | |
54 | /* Read / Write (Control register): Reset state: 1011 0100 */ |
55 | #define AS_CONTROL_REG 0x04 |
56 | #define AS_CONTROL_MODE_SETTING_SHIFT 0 |
57 | #define AS_CONTROL_STROBE_ON (1 << 2) |
58 | #define AS_CONTROL_OUT_ON (1 << 3) |
59 | #define AS_CONTROL_EXT_TORCH_ON (1 << 4) |
60 | #define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5) |
61 | #define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5) |
62 | #define AS_CONTROL_COIL_PEAK_SHIFT 6 |
63 | |
64 | /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */ |
65 | #define AS_FAULT_INFO_REG 0x05 |
66 | #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1) |
67 | #define AS_FAULT_INFO_INDICATOR_LED (1 << 2) |
68 | #define AS_FAULT_INFO_LED_AMOUNT (1 << 3) |
69 | #define AS_FAULT_INFO_TIMEOUT (1 << 4) |
70 | #define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5) |
71 | #define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6) |
72 | #define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7) |
73 | |
74 | /* Boost register */ |
75 | #define AS_BOOST_REG 0x0d |
76 | #define AS_BOOST_CURRENT_DISABLE (0 << 0) |
77 | #define AS_BOOST_CURRENT_ENABLE (1 << 0) |
78 | |
79 | /* Password register is used to unlock boost register writing */ |
80 | #define AS_PASSWORD_REG 0x0f |
81 | #define AS_PASSWORD_UNLOCK_VALUE 0x55 |
82 | |
83 | #define AS_NAME "as3645a" |
84 | #define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */ |
85 | |
86 | #define AS_FLASH_TIMEOUT_MIN 100000 /* us */ |
87 | #define AS_FLASH_TIMEOUT_MAX 850000 |
88 | #define AS_FLASH_TIMEOUT_STEP 50000 |
89 | |
90 | #define AS_FLASH_INTENSITY_MIN 200000 /* uA */ |
91 | #define AS_FLASH_INTENSITY_MAX_1LED 500000 |
92 | #define AS_FLASH_INTENSITY_MAX_2LEDS 400000 |
93 | #define AS_FLASH_INTENSITY_STEP 20000 |
94 | |
95 | #define AS_TORCH_INTENSITY_MIN 20000 /* uA */ |
96 | #define AS_TORCH_INTENSITY_MAX 160000 |
97 | #define AS_TORCH_INTENSITY_STEP 20000 |
98 | |
99 | #define AS_INDICATOR_INTENSITY_MIN 0 /* uA */ |
100 | #define AS_INDICATOR_INTENSITY_MAX 10000 |
101 | #define AS_INDICATOR_INTENSITY_STEP 2500 |
102 | |
103 | #define AS_PEAK_mA_MAX 2000 |
104 | #define AS_PEAK_mA_TO_REG(a) \ |
105 | ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250) |
106 | |
107 | /* LED numbers for Devicetree */ |
108 | #define AS_LED_FLASH 0 |
109 | #define AS_LED_INDICATOR 1 |
110 | |
111 | enum as_mode { |
112 | AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT, |
113 | AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT, |
114 | AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT, |
115 | AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT, |
116 | }; |
117 | |
118 | struct as3645a_config { |
119 | u32 flash_timeout_us; |
120 | u32 flash_max_ua; |
121 | u32 assist_max_ua; |
122 | u32 indicator_max_ua; |
123 | u32 voltage_reference; |
124 | u32 peak; |
125 | }; |
126 | |
127 | struct as3645a { |
128 | struct i2c_client *client; |
129 | |
130 | struct mutex mutex; |
131 | |
132 | struct led_classdev_flash fled; |
133 | struct led_classdev iled_cdev; |
134 | |
135 | struct v4l2_flash *vf; |
136 | struct v4l2_flash *vfind; |
137 | |
138 | struct fwnode_handle *flash_node; |
139 | struct fwnode_handle *indicator_node; |
140 | |
141 | struct as3645a_config cfg; |
142 | |
143 | enum as_mode mode; |
144 | unsigned int timeout; |
145 | unsigned int flash_current; |
146 | unsigned int assist_current; |
147 | unsigned int indicator_current; |
148 | enum v4l2_flash_strobe_source strobe_source; |
149 | }; |
150 | |
151 | #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled) |
152 | #define iled_cdev_to_as3645a(__iled_cdev) \ |
153 | container_of(__iled_cdev, struct as3645a, iled_cdev) |
154 | |
155 | /* Return negative errno else zero on success */ |
156 | static int as3645a_write(struct as3645a *flash, u8 addr, u8 val) |
157 | { |
158 | struct i2c_client *client = flash->client; |
159 | int rval; |
160 | |
161 | rval = i2c_smbus_write_byte_data(client, command: addr, value: val); |
162 | |
163 | dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n" , addr, val, |
164 | rval < 0 ? "fail" : "ok" ); |
165 | |
166 | return rval; |
167 | } |
168 | |
169 | /* Return negative errno else a data byte received from the device. */ |
170 | static int as3645a_read(struct as3645a *flash, u8 addr) |
171 | { |
172 | struct i2c_client *client = flash->client; |
173 | int rval; |
174 | |
175 | rval = i2c_smbus_read_byte_data(client, command: addr); |
176 | |
177 | dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n" , addr, rval, |
178 | rval < 0 ? "fail" : "ok" ); |
179 | |
180 | return rval; |
181 | } |
182 | |
183 | /* ----------------------------------------------------------------------------- |
184 | * Hardware configuration and trigger |
185 | */ |
186 | |
187 | /** |
188 | * as3645a_set_current - Set flash configuration registers |
189 | * @flash: The flash |
190 | * |
191 | * Configure the hardware with flash, assist and indicator currents, as well as |
192 | * flash timeout. |
193 | * |
194 | * Return 0 on success, or a negative error code if an I2C communication error |
195 | * occurred. |
196 | */ |
197 | static int as3645a_set_current(struct as3645a *flash) |
198 | { |
199 | u8 val; |
200 | |
201 | val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT) |
202 | | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT) |
203 | | AS_CURRENT_LED_DET_ON; |
204 | |
205 | return as3645a_write(flash, AS_CURRENT_SET_REG, val); |
206 | } |
207 | |
208 | static int as3645a_set_timeout(struct as3645a *flash) |
209 | { |
210 | u8 val; |
211 | |
212 | val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT; |
213 | |
214 | val |= (flash->cfg.voltage_reference |
215 | << AS_INDICATOR_AND_TIMER_VREF_SHIFT) |
216 | | ((flash->indicator_current ? flash->indicator_current - 1 : 0) |
217 | << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT); |
218 | |
219 | return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val); |
220 | } |
221 | |
222 | /** |
223 | * as3645a_set_control - Set flash control register |
224 | * @flash: The flash |
225 | * @mode: Desired output mode |
226 | * @on: Desired output state |
227 | * |
228 | * Configure the hardware with output mode and state. |
229 | * |
230 | * Return 0 on success, or a negative error code if an I2C communication error |
231 | * occurred. |
232 | */ |
233 | static int |
234 | as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on) |
235 | { |
236 | u8 reg; |
237 | |
238 | /* Configure output parameters and operation mode. */ |
239 | reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT) |
240 | | (on ? AS_CONTROL_OUT_ON : 0) |
241 | | mode; |
242 | |
243 | if (mode == AS_MODE_FLASH && |
244 | flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) |
245 | reg |= AS_CONTROL_STROBE_TYPE_LEVEL |
246 | | AS_CONTROL_STROBE_ON; |
247 | |
248 | return as3645a_write(flash, AS_CONTROL_REG, val: reg); |
249 | } |
250 | |
251 | static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault) |
252 | { |
253 | struct as3645a *flash = fled_to_as3645a(fled); |
254 | int rval; |
255 | |
256 | /* NOTE: reading register clears fault status */ |
257 | rval = as3645a_read(flash, AS_FAULT_INFO_REG); |
258 | if (rval < 0) |
259 | return rval; |
260 | |
261 | if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) |
262 | *fault |= LED_FAULT_OVER_CURRENT; |
263 | |
264 | if (rval & AS_FAULT_INFO_INDICATOR_LED) |
265 | *fault |= LED_FAULT_INDICATOR; |
266 | |
267 | dev_dbg(&flash->client->dev, "%u connected LEDs\n" , |
268 | rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1); |
269 | |
270 | if (rval & AS_FAULT_INFO_TIMEOUT) |
271 | *fault |= LED_FAULT_TIMEOUT; |
272 | |
273 | if (rval & AS_FAULT_INFO_OVER_TEMPERATURE) |
274 | *fault |= LED_FAULT_OVER_TEMPERATURE; |
275 | |
276 | if (rval & AS_FAULT_INFO_SHORT_CIRCUIT) |
277 | *fault |= LED_FAULT_OVER_CURRENT; |
278 | |
279 | if (rval & AS_FAULT_INFO_OVER_VOLTAGE) |
280 | *fault |= LED_FAULT_INPUT_VOLTAGE; |
281 | |
282 | return rval; |
283 | } |
284 | |
285 | static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max, |
286 | unsigned int step, |
287 | unsigned int val) |
288 | { |
289 | if (val < min) |
290 | val = min; |
291 | |
292 | if (val > max) |
293 | val = max; |
294 | |
295 | return (val - min) / step; |
296 | } |
297 | |
298 | static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash, |
299 | unsigned int ua) |
300 | { |
301 | if (is_flash) |
302 | return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN, |
303 | max: flash->cfg.assist_max_ua, |
304 | AS_TORCH_INTENSITY_STEP, val: ua); |
305 | else |
306 | return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN, |
307 | max: flash->cfg.flash_max_ua, |
308 | AS_FLASH_INTENSITY_STEP, val: ua); |
309 | } |
310 | |
311 | static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev, |
312 | enum led_brightness brightness) |
313 | { |
314 | struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev); |
315 | int rval; |
316 | |
317 | flash->indicator_current = brightness; |
318 | |
319 | rval = as3645a_set_timeout(flash); |
320 | if (rval) |
321 | return rval; |
322 | |
323 | return as3645a_set_control(flash, mode: AS_MODE_INDICATOR, on: brightness); |
324 | } |
325 | |
326 | static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev, |
327 | enum led_brightness brightness) |
328 | { |
329 | struct led_classdev_flash *fled = lcdev_to_flcdev(lcdev: fled_cdev); |
330 | struct as3645a *flash = fled_to_as3645a(fled); |
331 | int rval; |
332 | |
333 | if (brightness) { |
334 | /* Register value 0 is 20 mA. */ |
335 | flash->assist_current = brightness - 1; |
336 | |
337 | rval = as3645a_set_current(flash); |
338 | if (rval) |
339 | return rval; |
340 | } |
341 | |
342 | return as3645a_set_control(flash, mode: AS_MODE_ASSIST, on: brightness); |
343 | } |
344 | |
345 | static int as3645a_set_flash_brightness(struct led_classdev_flash *fled, |
346 | u32 brightness_ua) |
347 | { |
348 | struct as3645a *flash = fled_to_as3645a(fled); |
349 | |
350 | flash->flash_current = as3645a_current_to_reg(flash, is_flash: true, |
351 | ua: brightness_ua); |
352 | |
353 | return as3645a_set_current(flash); |
354 | } |
355 | |
356 | static int as3645a_set_flash_timeout(struct led_classdev_flash *fled, |
357 | u32 timeout_us) |
358 | { |
359 | struct as3645a *flash = fled_to_as3645a(fled); |
360 | |
361 | flash->timeout = AS_TIMER_US_TO_CODE(timeout_us); |
362 | |
363 | return as3645a_set_timeout(flash); |
364 | } |
365 | |
366 | static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state) |
367 | { |
368 | struct as3645a *flash = fled_to_as3645a(fled); |
369 | |
370 | return as3645a_set_control(flash, mode: AS_MODE_FLASH, on: state); |
371 | } |
372 | |
373 | static const struct led_flash_ops as3645a_led_flash_ops = { |
374 | .flash_brightness_set = as3645a_set_flash_brightness, |
375 | .timeout_set = as3645a_set_flash_timeout, |
376 | .strobe_set = as3645a_set_strobe, |
377 | .fault_get = as3645a_get_fault, |
378 | }; |
379 | |
380 | static int as3645a_setup(struct as3645a *flash) |
381 | { |
382 | struct device *dev = &flash->client->dev; |
383 | u32 fault = 0; |
384 | int rval; |
385 | |
386 | /* clear errors */ |
387 | rval = as3645a_read(flash, AS_FAULT_INFO_REG); |
388 | if (rval < 0) |
389 | return rval; |
390 | |
391 | dev_dbg(dev, "Fault info: %02x\n" , rval); |
392 | |
393 | rval = as3645a_set_current(flash); |
394 | if (rval < 0) |
395 | return rval; |
396 | |
397 | rval = as3645a_set_timeout(flash); |
398 | if (rval < 0) |
399 | return rval; |
400 | |
401 | rval = as3645a_set_control(flash, mode: AS_MODE_INDICATOR, on: false); |
402 | if (rval < 0) |
403 | return rval; |
404 | |
405 | /* read status */ |
406 | rval = as3645a_get_fault(fled: &flash->fled, fault: &fault); |
407 | if (rval < 0) |
408 | return rval; |
409 | |
410 | dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n" , |
411 | as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG)); |
412 | dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n" , |
413 | as3645a_read(flash, AS_CURRENT_SET_REG)); |
414 | dev_dbg(dev, "AS_CONTROL_REG: %02x\n" , |
415 | as3645a_read(flash, AS_CONTROL_REG)); |
416 | |
417 | return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0; |
418 | } |
419 | |
420 | static int as3645a_detect(struct as3645a *flash) |
421 | { |
422 | struct device *dev = &flash->client->dev; |
423 | int rval, man, model, rfu, version; |
424 | const char *vendor; |
425 | |
426 | rval = as3645a_read(flash, AS_DESIGN_INFO_REG); |
427 | if (rval < 0) { |
428 | dev_err(dev, "can't read design info reg\n" ); |
429 | return rval; |
430 | } |
431 | |
432 | man = AS_DESIGN_INFO_FACTORY(rval); |
433 | model = AS_DESIGN_INFO_MODEL(rval); |
434 | |
435 | rval = as3645a_read(flash, AS_VERSION_CONTROL_REG); |
436 | if (rval < 0) { |
437 | dev_err(dev, "can't read version control reg\n" ); |
438 | return rval; |
439 | } |
440 | |
441 | rfu = AS_VERSION_CONTROL_RFU(rval); |
442 | version = AS_VERSION_CONTROL_VERSION(rval); |
443 | |
444 | /* Verify the chip model and version. */ |
445 | if (model != 0x01 || rfu != 0x00) { |
446 | dev_err(dev, "AS3645A not detected (model %d rfu %d)\n" , |
447 | model, rfu); |
448 | return -ENODEV; |
449 | } |
450 | |
451 | switch (man) { |
452 | case 1: |
453 | vendor = "AMS, Austria Micro Systems" ; |
454 | break; |
455 | case 2: |
456 | vendor = "ADI, Analog Devices Inc." ; |
457 | break; |
458 | case 3: |
459 | vendor = "NSC, National Semiconductor" ; |
460 | break; |
461 | case 4: |
462 | vendor = "NXP" ; |
463 | break; |
464 | case 5: |
465 | vendor = "TI, Texas Instrument" ; |
466 | break; |
467 | default: |
468 | vendor = "Unknown" ; |
469 | } |
470 | |
471 | dev_info(dev, "Chip vendor: %s (%d) Version: %d\n" , vendor, |
472 | man, version); |
473 | |
474 | rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE); |
475 | if (rval < 0) |
476 | return rval; |
477 | |
478 | return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE); |
479 | } |
480 | |
481 | static int as3645a_parse_node(struct as3645a *flash, |
482 | struct fwnode_handle *fwnode) |
483 | { |
484 | struct as3645a_config *cfg = &flash->cfg; |
485 | struct fwnode_handle *child; |
486 | int rval; |
487 | |
488 | fwnode_for_each_child_node(fwnode, child) { |
489 | u32 id = 0; |
490 | |
491 | fwnode_property_read_u32(fwnode: child, propname: "reg" , val: &id); |
492 | |
493 | switch (id) { |
494 | case AS_LED_FLASH: |
495 | flash->flash_node = child; |
496 | fwnode_handle_get(fwnode: child); |
497 | break; |
498 | case AS_LED_INDICATOR: |
499 | flash->indicator_node = child; |
500 | fwnode_handle_get(fwnode: child); |
501 | break; |
502 | default: |
503 | dev_warn(&flash->client->dev, |
504 | "unknown LED %u encountered, ignoring\n" , id); |
505 | break; |
506 | } |
507 | } |
508 | |
509 | if (!flash->flash_node) { |
510 | dev_err(&flash->client->dev, "can't find flash node\n" ); |
511 | return -ENODEV; |
512 | } |
513 | |
514 | rval = fwnode_property_read_u32(fwnode: flash->flash_node, propname: "flash-timeout-us" , |
515 | val: &cfg->flash_timeout_us); |
516 | if (rval < 0) { |
517 | dev_err(&flash->client->dev, |
518 | "can't read flash-timeout-us property for flash\n" ); |
519 | goto out_err; |
520 | } |
521 | |
522 | rval = fwnode_property_read_u32(fwnode: flash->flash_node, propname: "flash-max-microamp" , |
523 | val: &cfg->flash_max_ua); |
524 | if (rval < 0) { |
525 | dev_err(&flash->client->dev, |
526 | "can't read flash-max-microamp property for flash\n" ); |
527 | goto out_err; |
528 | } |
529 | |
530 | rval = fwnode_property_read_u32(fwnode: flash->flash_node, propname: "led-max-microamp" , |
531 | val: &cfg->assist_max_ua); |
532 | if (rval < 0) { |
533 | dev_err(&flash->client->dev, |
534 | "can't read led-max-microamp property for flash\n" ); |
535 | goto out_err; |
536 | } |
537 | |
538 | fwnode_property_read_u32(fwnode: flash->flash_node, propname: "voltage-reference" , |
539 | val: &cfg->voltage_reference); |
540 | |
541 | fwnode_property_read_u32(fwnode: flash->flash_node, propname: "ams,input-max-microamp" , |
542 | val: &cfg->peak); |
543 | cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak); |
544 | |
545 | if (!flash->indicator_node) { |
546 | dev_warn(&flash->client->dev, |
547 | "can't find indicator node\n" ); |
548 | rval = -ENODEV; |
549 | goto out_err; |
550 | } |
551 | |
552 | |
553 | rval = fwnode_property_read_u32(fwnode: flash->indicator_node, |
554 | propname: "led-max-microamp" , |
555 | val: &cfg->indicator_max_ua); |
556 | if (rval < 0) { |
557 | dev_err(&flash->client->dev, |
558 | "can't read led-max-microamp property for indicator\n" ); |
559 | goto out_err; |
560 | } |
561 | |
562 | return 0; |
563 | |
564 | out_err: |
565 | fwnode_handle_put(fwnode: flash->flash_node); |
566 | fwnode_handle_put(fwnode: flash->indicator_node); |
567 | |
568 | return rval; |
569 | } |
570 | |
571 | static int as3645a_led_class_setup(struct as3645a *flash) |
572 | { |
573 | struct led_classdev *fled_cdev = &flash->fled.led_cdev; |
574 | struct led_classdev *iled_cdev = &flash->iled_cdev; |
575 | struct led_init_data init_data = {}; |
576 | struct led_flash_setting *cfg; |
577 | int rval; |
578 | |
579 | iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness; |
580 | iled_cdev->max_brightness = |
581 | flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP; |
582 | iled_cdev->flags = LED_CORE_SUSPENDRESUME; |
583 | |
584 | init_data.fwnode = flash->indicator_node; |
585 | init_data.devicename = AS_NAME; |
586 | init_data.default_label = "indicator" ; |
587 | |
588 | rval = led_classdev_register_ext(parent: &flash->client->dev, led_cdev: iled_cdev, |
589 | init_data: &init_data); |
590 | if (rval < 0) |
591 | return rval; |
592 | |
593 | cfg = &flash->fled.brightness; |
594 | cfg->min = AS_FLASH_INTENSITY_MIN; |
595 | cfg->max = flash->cfg.flash_max_ua; |
596 | cfg->step = AS_FLASH_INTENSITY_STEP; |
597 | cfg->val = flash->cfg.flash_max_ua; |
598 | |
599 | cfg = &flash->fled.timeout; |
600 | cfg->min = AS_FLASH_TIMEOUT_MIN; |
601 | cfg->max = flash->cfg.flash_timeout_us; |
602 | cfg->step = AS_FLASH_TIMEOUT_STEP; |
603 | cfg->val = flash->cfg.flash_timeout_us; |
604 | |
605 | flash->fled.ops = &as3645a_led_flash_ops; |
606 | |
607 | fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness; |
608 | /* Value 0 is off in LED class. */ |
609 | fled_cdev->max_brightness = |
610 | as3645a_current_to_reg(flash, is_flash: false, |
611 | ua: flash->cfg.assist_max_ua) + 1; |
612 | fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME; |
613 | |
614 | init_data.fwnode = flash->flash_node; |
615 | init_data.devicename = AS_NAME; |
616 | init_data.default_label = "flash" ; |
617 | |
618 | rval = led_classdev_flash_register_ext(parent: &flash->client->dev, |
619 | fled_cdev: &flash->fled, init_data: &init_data); |
620 | if (rval) |
621 | goto out_err; |
622 | |
623 | return rval; |
624 | |
625 | out_err: |
626 | led_classdev_unregister(led_cdev: iled_cdev); |
627 | dev_err(&flash->client->dev, |
628 | "led_classdev_flash_register() failed, error %d\n" , |
629 | rval); |
630 | return rval; |
631 | } |
632 | |
633 | static int as3645a_v4l2_setup(struct as3645a *flash) |
634 | { |
635 | struct led_classdev_flash *fled = &flash->fled; |
636 | struct led_classdev *led = &fled->led_cdev; |
637 | struct v4l2_flash_config cfg = { |
638 | .intensity = { |
639 | .min = AS_TORCH_INTENSITY_MIN, |
640 | .max = flash->cfg.assist_max_ua, |
641 | .step = AS_TORCH_INTENSITY_STEP, |
642 | .val = flash->cfg.assist_max_ua, |
643 | }, |
644 | }; |
645 | struct v4l2_flash_config cfgind = { |
646 | .intensity = { |
647 | .min = AS_INDICATOR_INTENSITY_MIN, |
648 | .max = flash->cfg.indicator_max_ua, |
649 | .step = AS_INDICATOR_INTENSITY_STEP, |
650 | .val = flash->cfg.indicator_max_ua, |
651 | }, |
652 | }; |
653 | |
654 | strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name)); |
655 | strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name, |
656 | sizeof(cfgind.dev_name)); |
657 | |
658 | flash->vf = v4l2_flash_init( |
659 | dev: &flash->client->dev, fwn: flash->flash_node, fled_cdev: &flash->fled, NULL, |
660 | config: &cfg); |
661 | if (IS_ERR(ptr: flash->vf)) |
662 | return PTR_ERR(ptr: flash->vf); |
663 | |
664 | flash->vfind = v4l2_flash_indicator_init( |
665 | dev: &flash->client->dev, fwn: flash->indicator_node, iled_cdev: &flash->iled_cdev, |
666 | config: &cfgind); |
667 | if (IS_ERR(ptr: flash->vfind)) { |
668 | v4l2_flash_release(v4l2_flash: flash->vf); |
669 | return PTR_ERR(ptr: flash->vfind); |
670 | } |
671 | |
672 | return 0; |
673 | } |
674 | |
675 | static int as3645a_probe(struct i2c_client *client) |
676 | { |
677 | struct as3645a *flash; |
678 | int rval; |
679 | |
680 | if (!dev_fwnode(&client->dev)) |
681 | return -ENODEV; |
682 | |
683 | flash = devm_kzalloc(dev: &client->dev, size: sizeof(*flash), GFP_KERNEL); |
684 | if (flash == NULL) |
685 | return -ENOMEM; |
686 | |
687 | flash->client = client; |
688 | |
689 | rval = as3645a_parse_node(flash, dev_fwnode(&client->dev)); |
690 | if (rval < 0) |
691 | return rval; |
692 | |
693 | rval = as3645a_detect(flash); |
694 | if (rval < 0) |
695 | goto out_put_nodes; |
696 | |
697 | mutex_init(&flash->mutex); |
698 | i2c_set_clientdata(client, data: flash); |
699 | |
700 | rval = as3645a_setup(flash); |
701 | if (rval) |
702 | goto out_mutex_destroy; |
703 | |
704 | rval = as3645a_led_class_setup(flash); |
705 | if (rval) |
706 | goto out_mutex_destroy; |
707 | |
708 | rval = as3645a_v4l2_setup(flash); |
709 | if (rval) |
710 | goto out_led_classdev_flash_unregister; |
711 | |
712 | return 0; |
713 | |
714 | out_led_classdev_flash_unregister: |
715 | led_classdev_flash_unregister(fled_cdev: &flash->fled); |
716 | |
717 | out_mutex_destroy: |
718 | mutex_destroy(lock: &flash->mutex); |
719 | |
720 | out_put_nodes: |
721 | fwnode_handle_put(fwnode: flash->flash_node); |
722 | fwnode_handle_put(fwnode: flash->indicator_node); |
723 | |
724 | return rval; |
725 | } |
726 | |
727 | static void as3645a_remove(struct i2c_client *client) |
728 | { |
729 | struct as3645a *flash = i2c_get_clientdata(client); |
730 | |
731 | as3645a_set_control(flash, mode: AS_MODE_EXT_TORCH, on: false); |
732 | |
733 | v4l2_flash_release(v4l2_flash: flash->vf); |
734 | v4l2_flash_release(v4l2_flash: flash->vfind); |
735 | |
736 | led_classdev_flash_unregister(fled_cdev: &flash->fled); |
737 | led_classdev_unregister(led_cdev: &flash->iled_cdev); |
738 | |
739 | mutex_destroy(lock: &flash->mutex); |
740 | |
741 | fwnode_handle_put(fwnode: flash->flash_node); |
742 | fwnode_handle_put(fwnode: flash->indicator_node); |
743 | } |
744 | |
745 | static const struct i2c_device_id as3645a_id_table[] = { |
746 | { AS_NAME, 0 }, |
747 | { }, |
748 | }; |
749 | MODULE_DEVICE_TABLE(i2c, as3645a_id_table); |
750 | |
751 | static const struct of_device_id as3645a_of_table[] = { |
752 | { .compatible = "ams,as3645a" }, |
753 | { }, |
754 | }; |
755 | MODULE_DEVICE_TABLE(of, as3645a_of_table); |
756 | |
757 | static struct i2c_driver as3645a_i2c_driver = { |
758 | .driver = { |
759 | .of_match_table = as3645a_of_table, |
760 | .name = AS_NAME, |
761 | }, |
762 | .probe = as3645a_probe, |
763 | .remove = as3645a_remove, |
764 | .id_table = as3645a_id_table, |
765 | }; |
766 | |
767 | module_i2c_driver(as3645a_i2c_driver); |
768 | |
769 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>" ); |
770 | MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>" ); |
771 | MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones" ); |
772 | MODULE_LICENSE("GPL v2" ); |
773 | |