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 */
as3645a_write(struct as3645a * flash,u8 addr,u8 val)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, addr, 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. */
as3645a_read(struct as3645a * flash,u8 addr)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, 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 */
as3645a_set_current(struct as3645a * flash)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
as3645a_set_timeout(struct as3645a * flash)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
as3645a_set_control(struct as3645a * flash,enum as_mode mode,bool on)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, reg);
249 }
250
as3645a_get_fault(struct led_classdev_flash * fled,u32 * fault)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
__as3645a_current_to_reg(unsigned int min,unsigned int max,unsigned int step,unsigned int val)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
as3645a_current_to_reg(struct as3645a * flash,bool is_flash,unsigned int ua)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 flash->cfg.assist_max_ua,
304 AS_TORCH_INTENSITY_STEP, ua);
305 else
306 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
307 flash->cfg.flash_max_ua,
308 AS_FLASH_INTENSITY_STEP, ua);
309 }
310
as3645a_set_indicator_brightness(struct led_classdev * iled_cdev,enum led_brightness brightness)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, AS_MODE_INDICATOR, brightness);
324 }
325
as3645a_set_assist_brightness(struct led_classdev * fled_cdev,enum led_brightness brightness)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(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, AS_MODE_ASSIST, brightness);
343 }
344
as3645a_set_flash_brightness(struct led_classdev_flash * fled,u32 brightness_ua)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, true,
351 brightness_ua);
352
353 return as3645a_set_current(flash);
354 }
355
as3645a_set_flash_timeout(struct led_classdev_flash * fled,u32 timeout_us)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
as3645a_set_strobe(struct led_classdev_flash * fled,bool state)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, AS_MODE_FLASH, 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
as3645a_setup(struct as3645a * flash)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, AS_MODE_INDICATOR, false);
402 if (rval < 0)
403 return rval;
404
405 /* read status */
406 rval = as3645a_get_fault(&flash->fled, &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
as3645a_detect(struct as3645a * flash)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
as3645a_parse_node(struct as3645a * flash,struct fwnode_handle * fwnode)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(child, "reg", &id);
492
493 switch (id) {
494 case AS_LED_FLASH:
495 flash->flash_node = child;
496 fwnode_handle_get(child);
497 break;
498 case AS_LED_INDICATOR:
499 flash->indicator_node = child;
500 fwnode_handle_get(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(flash->flash_node, "flash-timeout-us",
515 &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(flash->flash_node, "flash-max-microamp",
523 &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(flash->flash_node, "led-max-microamp",
531 &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(flash->flash_node, "voltage-reference",
539 &cfg->voltage_reference);
540
541 fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
542 &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(flash->indicator_node,
554 "led-max-microamp",
555 &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(flash->flash_node);
566 fwnode_handle_put(flash->indicator_node);
567
568 return rval;
569 }
570
as3645a_led_class_setup(struct as3645a * flash)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(&flash->client->dev, iled_cdev,
589 &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, false,
611 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(&flash->client->dev,
619 &flash->fled, &init_data);
620 if (rval)
621 goto out_err;
622
623 return rval;
624
625 out_err:
626 led_classdev_unregister(iled_cdev);
627 dev_err(&flash->client->dev,
628 "led_classdev_flash_register() failed, error %d\n",
629 rval);
630 return rval;
631 }
632
as3645a_v4l2_setup(struct as3645a * flash)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 strlcpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
655 strlcpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
656 sizeof(cfgind.dev_name));
657
658 flash->vf = v4l2_flash_init(
659 &flash->client->dev, flash->flash_node, &flash->fled, NULL,
660 &cfg);
661 if (IS_ERR(flash->vf))
662 return PTR_ERR(flash->vf);
663
664 flash->vfind = v4l2_flash_indicator_init(
665 &flash->client->dev, flash->indicator_node, &flash->iled_cdev,
666 &cfgind);
667 if (IS_ERR(flash->vfind)) {
668 v4l2_flash_release(flash->vf);
669 return PTR_ERR(flash->vfind);
670 }
671
672 return 0;
673 }
674
as3645a_probe(struct i2c_client * client)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(&client->dev, 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, 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(&flash->fled);
716
717 out_mutex_destroy:
718 mutex_destroy(&flash->mutex);
719
720 out_put_nodes:
721 fwnode_handle_put(flash->flash_node);
722 fwnode_handle_put(flash->indicator_node);
723
724 return rval;
725 }
726
as3645a_remove(struct i2c_client * client)727 static int as3645a_remove(struct i2c_client *client)
728 {
729 struct as3645a *flash = i2c_get_clientdata(client);
730
731 as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
732
733 v4l2_flash_release(flash->vf);
734 v4l2_flash_release(flash->vfind);
735
736 led_classdev_flash_unregister(&flash->fled);
737 led_classdev_unregister(&flash->iled_cdev);
738
739 mutex_destroy(&flash->mutex);
740
741 fwnode_handle_put(flash->flash_node);
742 fwnode_handle_put(flash->indicator_node);
743
744 return 0;
745 }
746
747 static const struct i2c_device_id as3645a_id_table[] = {
748 { AS_NAME, 0 },
749 { },
750 };
751 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
752
753 static const struct of_device_id as3645a_of_table[] = {
754 { .compatible = "ams,as3645a" },
755 { },
756 };
757 MODULE_DEVICE_TABLE(of, as3645a_of_table);
758
759 static struct i2c_driver as3645a_i2c_driver = {
760 .driver = {
761 .of_match_table = as3645a_of_table,
762 .name = AS_NAME,
763 },
764 .probe_new = as3645a_probe,
765 .remove = as3645a_remove,
766 .id_table = as3645a_id_table,
767 };
768
769 module_i2c_driver(as3645a_i2c_driver);
770
771 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
772 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
773 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
774 MODULE_LICENSE("GPL v2");
775