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[linux-2.6-block.git] / drivers / leds / leds-as3645a.c
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1802d0be 1// SPDX-License-Identifier: GPL-2.0-only
a56ba8fb
SA		 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>
a56ba8fb
SA		 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>
88b7e9ff 20#include <linux/property.h>
a56ba8fb
SA		 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
e626c325
SA		 107/* LED numbers for Devicetree */
108#define AS_LED_FLASH 0
109#define AS_LED_INDICATOR 1
110
a56ba8fb
SA		 111enum 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
118struct 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
127struct as3645a_names {
128 char flash[32];
129 char indicator[32];
130};
131
132struct as3645a {
133 struct i2c_client *client;
134
135 struct mutex mutex;
136
137 struct led_classdev_flash fled;
138 struct led_classdev iled_cdev;
139
140 struct v4l2_flash *vf;
141 struct v4l2_flash *vfind;
142
88b7e9ff
SA		 143 struct fwnode_handle *flash_node;
144 struct fwnode_handle *indicator_node;
a56ba8fb
SA		 145
146 struct as3645a_config cfg;
147
148 enum as_mode mode;
149 unsigned int timeout;
150 unsigned int flash_current;
151 unsigned int assist_current;
152 unsigned int indicator_current;
153 enum v4l2_flash_strobe_source strobe_source;
154};
155
156#define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
157#define iled_cdev_to_as3645a(__iled_cdev) \
158 container_of(__iled_cdev, struct as3645a, iled_cdev)
159
160/* Return negative errno else zero on success */
161static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
162{
163 struct i2c_client *client = flash->client;
164 int rval;
165
166 rval = i2c_smbus_write_byte_data(client, addr, val);
167
168 dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
169 rval < 0 ? "fail" : "ok");
170
171 return rval;
172}
173
174/* Return negative errno else a data byte received from the device. */
175static int as3645a_read(struct as3645a *flash, u8 addr)
176{
177 struct i2c_client *client = flash->client;
178 int rval;
179
180 rval = i2c_smbus_read_byte_data(client, addr);
181
182 dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
183 rval < 0 ? "fail" : "ok");
184
185 return rval;
186}
187
188/* -----------------------------------------------------------------------------
189 * Hardware configuration and trigger
190 */
191
192/**
193 * as3645a_set_config - Set flash configuration registers
194 * @flash: The flash
195 *
196 * Configure the hardware with flash, assist and indicator currents, as well as
197 * flash timeout.
198 *
199 * Return 0 on success, or a negative error code if an I2C communication error
200 * occurred.
201 */
202static int as3645a_set_current(struct as3645a *flash)
203{
204 u8 val;
205
206 val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
207 | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
208 | AS_CURRENT_LED_DET_ON;
209
210 return as3645a_write(flash, AS_CURRENT_SET_REG, val);
211}
212
213static int as3645a_set_timeout(struct as3645a *flash)
214{
215 u8 val;
216
217 val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
218
219 val |= (flash->cfg.voltage_reference
220 << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
221 | ((flash->indicator_current ? flash->indicator_current - 1 : 0)
222 << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
223
224 return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
225}
226
227/**
228 * as3645a_set_control - Set flash control register
229 * @flash: The flash
230 * @mode: Desired output mode
231 * @on: Desired output state
232 *
233 * Configure the hardware with output mode and state.
234 *
235 * Return 0 on success, or a negative error code if an I2C communication error
236 * occurred.
237 */
238static int
239as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
240{
241 u8 reg;
242
243 /* Configure output parameters and operation mode. */
244 reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
245 | (on ? AS_CONTROL_OUT_ON : 0)
246 | mode;
247
248 if (mode == AS_MODE_FLASH &&
249 flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
250 reg |= AS_CONTROL_STROBE_TYPE_LEVEL
251 | AS_CONTROL_STROBE_ON;
252
253 return as3645a_write(flash, AS_CONTROL_REG, reg);
254}
255
256static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
257{
258 struct as3645a *flash = fled_to_as3645a(fled);
259 int rval;
260
261 /* NOTE: reading register clears fault status */
262 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
263 if (rval < 0)
264 return rval;
265
266 if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
267 *fault |= LED_FAULT_OVER_CURRENT;
268
269 if (rval & AS_FAULT_INFO_INDICATOR_LED)
270 *fault |= LED_FAULT_INDICATOR;
271
272 dev_dbg(&flash->client->dev, "%u connected LEDs\n",
273 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
274
275 if (rval & AS_FAULT_INFO_TIMEOUT)
276 *fault |= LED_FAULT_TIMEOUT;
277
278 if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
279 *fault |= LED_FAULT_OVER_TEMPERATURE;
280
281 if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
282 *fault |= LED_FAULT_OVER_CURRENT;
283
284 if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
285 *fault |= LED_FAULT_INPUT_VOLTAGE;
286
287 return rval;
288}
289
290static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
291 unsigned int step,
292 unsigned int val)
293{
294 if (val < min)
295 val = min;
296
297 if (val > max)
298 val = max;
299
300 return (val - min) / step;
301}
302
303static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
304 unsigned int ua)
305{
306 if (is_flash)
307 return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
308 flash->cfg.assist_max_ua,
309 AS_TORCH_INTENSITY_STEP, ua);
310 else
311 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
312 flash->cfg.flash_max_ua,
313 AS_FLASH_INTENSITY_STEP, ua);
314}
315
316static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
317 enum led_brightness brightness)
318{
319 struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
320 int rval;
321
322 flash->indicator_current = brightness;
323
324 rval = as3645a_set_timeout(flash);
325 if (rval)
326 return rval;
327
328 return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
329}
330
331static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
332 enum led_brightness brightness)
333{
334 struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
335 struct as3645a *flash = fled_to_as3645a(fled);
336 int rval;
337
338 if (brightness) {
339 /* Register value 0 is 20 mA. */
340 flash->assist_current = brightness - 1;
341
342 rval = as3645a_set_current(flash);
343 if (rval)
344 return rval;
345 }
346
347 return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
348}
349
350static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
351 u32 brightness_ua)
352{
353 struct as3645a *flash = fled_to_as3645a(fled);
354
6b68441b
DM		 355 flash->flash_current = as3645a_current_to_reg(flash, true,
356 brightness_ua);
a56ba8fb
SA		 357
358 return as3645a_set_current(flash);
359}
360
361static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
362 u32 timeout_us)
363{
364 struct as3645a *flash = fled_to_as3645a(fled);
365
366 flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
367
368 return as3645a_set_timeout(flash);
369}
370
371static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
372{
373 struct as3645a *flash = fled_to_as3645a(fled);
374
375 return as3645a_set_control(flash, AS_MODE_FLASH, state);
376}
377
378static const struct led_flash_ops as3645a_led_flash_ops = {
379 .flash_brightness_set = as3645a_set_flash_brightness,
380 .timeout_set = as3645a_set_flash_timeout,
381 .strobe_set = as3645a_set_strobe,
382 .fault_get = as3645a_get_fault,
383};
384
385static int as3645a_setup(struct as3645a *flash)
386{
387 struct device *dev = &flash->client->dev;
388 u32 fault = 0;
389 int rval;
390
391 /* clear errors */
392 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
393 if (rval < 0)
394 return rval;
395
396 dev_dbg(dev, "Fault info: %02x\n", rval);
397
398 rval = as3645a_set_current(flash);
399 if (rval < 0)
400 return rval;
401
402 rval = as3645a_set_timeout(flash);
403 if (rval < 0)
404 return rval;
405
406 rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
407 if (rval < 0)
408 return rval;
409
410 /* read status */
411 rval = as3645a_get_fault(&flash->fled, &fault);
412 if (rval < 0)
413 return rval;
414
415 dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
416 as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
417 dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
418 as3645a_read(flash, AS_CURRENT_SET_REG));
419 dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
420 as3645a_read(flash, AS_CONTROL_REG));
421
422 return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
423}
424
425static int as3645a_detect(struct as3645a *flash)
426{
427 struct device *dev = &flash->client->dev;
428 int rval, man, model, rfu, version;
429 const char *vendor;
430
431 rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
432 if (rval < 0) {
433 dev_err(dev, "can't read design info reg\n");
434 return rval;
435 }
436
437 man = AS_DESIGN_INFO_FACTORY(rval);
438 model = AS_DESIGN_INFO_MODEL(rval);
439
440 rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
441 if (rval < 0) {
442 dev_err(dev, "can't read version control reg\n");
443 return rval;
444 }
445
446 rfu = AS_VERSION_CONTROL_RFU(rval);
447 version = AS_VERSION_CONTROL_VERSION(rval);
448
449 /* Verify the chip model and version. */
450 if (model != 0x01 || rfu != 0x00) {
faa91a7b
DM		 451 dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
452 model, rfu);
a56ba8fb
SA		 453 return -ENODEV;
454 }
455
456 switch (man) {
457 case 1:
458 vendor = "AMS, Austria Micro Systems";
459 break;
460 case 2:
461 vendor = "ADI, Analog Devices Inc.";
462 break;
463 case 3:
464 vendor = "NSC, National Semiconductor";
465 break;
466 case 4:
467 vendor = "NXP";
468 break;
469 case 5:
470 vendor = "TI, Texas Instrument";
471 break;
472 default:
473 vendor = "Unknown";
474 }
475
476 dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
477 man, version);
478
479 rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
480 if (rval < 0)
481 return rval;
482
483 return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
484}
485
486static int as3645a_parse_node(struct as3645a *flash,
487 struct as3645a_names *names,
88b7e9ff 488 struct fwnode_handle *fwnode)
a56ba8fb
SA		 489{
490 struct as3645a_config *cfg = &flash->cfg;
88b7e9ff 491 struct fwnode_handle *child;
a56ba8fb
SA		 492 const char *name;
493 int rval;
494
88b7e9ff 495 fwnode_for_each_child_node(fwnode, child) {
e626c325
SA		 496 u32 id = 0;
497
88b7e9ff 498 fwnode_property_read_u32(child, "reg", &id);
e626c325
SA		 499
500 switch (id) {
501 case AS_LED_FLASH:
88b7e9ff 502 flash->flash_node = child;
e626c325
SA		 503 break;
504 case AS_LED_INDICATOR:
88b7e9ff 505 flash->indicator_node = child;
e626c325
SA		 506 break;
507 default:
508 dev_warn(&flash->client->dev,
509 "unknown LED %u encountered, ignoring\n", id);
510 break;
511 }
88b7e9ff 512 fwnode_handle_get(child);
e626c325
SA		 513 }
514
a56ba8fb
SA		 515 if (!flash->flash_node) {
516 dev_err(&flash->client->dev, "can't find flash node\n");
517 return -ENODEV;
518 }
519
88b7e9ff
SA		 520 rval = fwnode_property_read_string(flash->flash_node, "label", &name);
521 if (!rval) {
a56ba8fb 522 strlcpy(names->flash, name, sizeof(names->flash));
88b7e9ff 523 } else if (is_of_node(fwnode)) {
a56ba8fb 524 snprintf(names->flash, sizeof(names->flash),
88b7e9ff
SA		 525 "%pOFn:flash", to_of_node(fwnode));
526 } else {
527 dev_err(&flash->client->dev, "flash node has no label!\n");
528 return -EINVAL;
529 }
a56ba8fb 530
88b7e9ff
SA		 531 rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
532 &cfg->flash_timeout_us);
a56ba8fb
SA		 533 if (rval < 0) {
534 dev_err(&flash->client->dev,
535 "can't read flash-timeout-us property for flash\n");
536 goto out_err;
537 }
538
88b7e9ff
SA		 539 rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
540 &cfg->flash_max_ua);
a56ba8fb
SA		 541 if (rval < 0) {
542 dev_err(&flash->client->dev,
543 "can't read flash-max-microamp property for flash\n");
544 goto out_err;
545 }
546
88b7e9ff
SA		 547 rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
548 &cfg->assist_max_ua);
a56ba8fb
SA		 549 if (rval < 0) {
550 dev_err(&flash->client->dev,
551 "can't read led-max-microamp property for flash\n");
552 goto out_err;
553 }
554
88b7e9ff
SA		 555 fwnode_property_read_u32(flash->flash_node, "voltage-reference",
556 &cfg->voltage_reference);
a56ba8fb 557
88b7e9ff
SA		 558 fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
559 &cfg->peak);
a56ba8fb
SA		 560 cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
561
a56ba8fb
SA		 562 if (!flash->indicator_node) {
563 dev_warn(&flash->client->dev,
564 "can't find indicator node\n");
565 goto out_err;
566 }
567
88b7e9ff
SA		 568 rval = fwnode_property_read_string(flash->indicator_node, "label",
569 &name);
570 if (!rval) {
a56ba8fb 571 strlcpy(names->indicator, name, sizeof(names->indicator));
88b7e9ff 572 } else if (is_of_node(fwnode)) {
a56ba8fb 573 snprintf(names->indicator, sizeof(names->indicator),
88b7e9ff
SA		 574 "%pOFn:indicator", to_of_node(fwnode));
575 } else {
576 dev_err(&flash->client->dev, "indicator node has no label!\n");
577 return -EINVAL;
578 }
a56ba8fb 579
88b7e9ff
SA		 580 rval = fwnode_property_read_u32(flash->indicator_node,
581 "led-max-microamp",
582 &cfg->indicator_max_ua);
a56ba8fb
SA		 583 if (rval < 0) {
584 dev_err(&flash->client->dev,
585 "can't read led-max-microamp property for indicator\n");
586 goto out_err;
587 }
588
589 return 0;
590
591out_err:
88b7e9ff
SA		 592 fwnode_handle_put(flash->flash_node);
593 fwnode_handle_put(flash->indicator_node);
a56ba8fb
SA		 594
595 return rval;
596}
597
598static int as3645a_led_class_setup(struct as3645a *flash,
599 struct as3645a_names *names)
600{
601 struct led_classdev *fled_cdev = &flash->fled.led_cdev;
602 struct led_classdev *iled_cdev = &flash->iled_cdev;
603 struct led_flash_setting *cfg;
604 int rval;
605
606 iled_cdev->name = names->indicator;
607 iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
608 iled_cdev->max_brightness =
609 flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
610 iled_cdev->flags = LED_CORE_SUSPENDRESUME;
611
612 rval = led_classdev_register(&flash->client->dev, iled_cdev);
613 if (rval < 0)
614 return rval;
615
616 cfg = &flash->fled.brightness;
617 cfg->min = AS_FLASH_INTENSITY_MIN;
618 cfg->max = flash->cfg.flash_max_ua;
619 cfg->step = AS_FLASH_INTENSITY_STEP;
620 cfg->val = flash->cfg.flash_max_ua;
621
622 cfg = &flash->fled.timeout;
623 cfg->min = AS_FLASH_TIMEOUT_MIN;
624 cfg->max = flash->cfg.flash_timeout_us;
625 cfg->step = AS_FLASH_TIMEOUT_STEP;
626 cfg->val = flash->cfg.flash_timeout_us;
627
628 flash->fled.ops = &as3645a_led_flash_ops;
629
630 fled_cdev->name = names->flash;
631 fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
632 /* Value 0 is off in LED class. */
633 fled_cdev->max_brightness =
634 as3645a_current_to_reg(flash, false,
635 flash->cfg.assist_max_ua) + 1;
636 fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
637
638 rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
639 if (rval) {
640 led_classdev_unregister(iled_cdev);
641 dev_err(&flash->client->dev,
642 "led_classdev_flash_register() failed, error %d\n",
643 rval);
644 }
645
646 return rval;
647}
648
649static int as3645a_v4l2_setup(struct as3645a *flash)
650{
651 struct led_classdev_flash *fled = &flash->fled;
652 struct led_classdev *led = &fled->led_cdev;
653 struct v4l2_flash_config cfg = {
654 .intensity = {
655 .min = AS_TORCH_INTENSITY_MIN,
656 .max = flash->cfg.assist_max_ua,
657 .step = AS_TORCH_INTENSITY_STEP,
658 .val = flash->cfg.assist_max_ua,
659 },
660 };
661 struct v4l2_flash_config cfgind = {
662 .intensity = {
663 .min = AS_INDICATOR_INTENSITY_MIN,
664 .max = flash->cfg.indicator_max_ua,
665 .step = AS_INDICATOR_INTENSITY_STEP,
666 .val = flash->cfg.indicator_max_ua,
667 },
668 };
669
670 strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
671 strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
672
673 flash->vf = v4l2_flash_init(
88b7e9ff
SA		 674 &flash->client->dev, flash->flash_node, &flash->fled, NULL,
675 &cfg);
a56ba8fb
SA		 676 if (IS_ERR(flash->vf))
677 return PTR_ERR(flash->vf);
678
679 flash->vfind = v4l2_flash_indicator_init(
88b7e9ff
SA		 680 &flash->client->dev, flash->indicator_node, &flash->iled_cdev,
681 &cfgind);
a56ba8fb
SA		 682 if (IS_ERR(flash->vfind)) {
683 v4l2_flash_release(flash->vf);
684 return PTR_ERR(flash->vfind);
685 }
686
687 return 0;
688}
689
690static int as3645a_probe(struct i2c_client *client)
691{
692 struct as3645a_names names;
693 struct as3645a *flash;
694 int rval;
695
88b7e9ff 696 if (!dev_fwnode(&client->dev))
a56ba8fb
SA		 697 return -ENODEV;
698
699 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
700 if (flash == NULL)
701 return -ENOMEM;
702
703 flash->client = client;
704
88b7e9ff 705 rval = as3645a_parse_node(flash, &names, dev_fwnode(&client->dev));
a56ba8fb
SA		 706 if (rval < 0)
707 return rval;
708
709 rval = as3645a_detect(flash);
710 if (rval < 0)
711 goto out_put_nodes;
712
713 mutex_init(&flash->mutex);
714 i2c_set_clientdata(client, flash);
715
716 rval = as3645a_setup(flash);
717 if (rval)
718 goto out_mutex_destroy;
719
720 rval = as3645a_led_class_setup(flash, &names);
721 if (rval)
722 goto out_mutex_destroy;
723
724 rval = as3645a_v4l2_setup(flash);
725 if (rval)
726 goto out_led_classdev_flash_unregister;
727
728 return 0;
729
730out_led_classdev_flash_unregister:
731 led_classdev_flash_unregister(&flash->fled);
732
733out_mutex_destroy:
734 mutex_destroy(&flash->mutex);
735
736out_put_nodes:
88b7e9ff
SA		 737 fwnode_handle_put(flash->flash_node);
738 fwnode_handle_put(flash->indicator_node);
a56ba8fb
SA		 739
740 return rval;
741}
742
743static int as3645a_remove(struct i2c_client *client)
744{
745 struct as3645a *flash = i2c_get_clientdata(client);
746
747 as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
748
749 v4l2_flash_release(flash->vf);
12c4b878 750 v4l2_flash_release(flash->vfind);
a56ba8fb
SA		 751
752 led_classdev_flash_unregister(&flash->fled);
753 led_classdev_unregister(&flash->iled_cdev);
754
755 mutex_destroy(&flash->mutex);
756
88b7e9ff
SA		 757 fwnode_handle_put(flash->flash_node);
758 fwnode_handle_put(flash->indicator_node);
a56ba8fb
SA		 759
760 return 0;
761}
762
763static const struct i2c_device_id as3645a_id_table[] = {
764 { AS_NAME, 0 },
765 { },
766};
767MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
768
769static const struct of_device_id as3645a_of_table[] = {
770 { .compatible = "ams,as3645a" },
771 { },
772};
773MODULE_DEVICE_TABLE(of, as3645a_of_table);
774
775static struct i2c_driver as3645a_i2c_driver = {
776 .driver = {
777 .of_match_table = as3645a_of_table,
778 .name = AS_NAME,
779 },
780 .probe_new = as3645a_probe,
781 .remove = as3645a_remove,
782 .id_table = as3645a_id_table,
783};
784
785module_i2c_driver(as3645a_i2c_driver);
786
787MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
788MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
789MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
790MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)