2 * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
4 * Copyright (C) 2008-2011 Nokia Corporation
5 * Copyright (c) 2011, 2017 Intel Corporation.
7 * Based on drivers/media/i2c/as3645a.c.
9 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
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.
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.
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/property.h>
29 #include <linux/slab.h>
31 #include <media/v4l2-flash-led-class.h>
33 #define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50)
34 #define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000)
36 /* Register definitions */
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)
43 /* Read-only Version control register: Reset state: 0000 0000
44 * for first engineering samples
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)
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
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
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
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)
83 #define AS_BOOST_REG 0x0d
84 #define AS_BOOST_CURRENT_DISABLE (0 << 0)
85 #define AS_BOOST_CURRENT_ENABLE (1 << 0)
87 /* Password register is used to unlock boost register writing */
88 #define AS_PASSWORD_REG 0x0f
89 #define AS_PASSWORD_UNLOCK_VALUE 0x55
91 #define AS_NAME "as3645a"
92 #define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */
94 #define AS_FLASH_TIMEOUT_MIN 100000 /* us */
95 #define AS_FLASH_TIMEOUT_MAX 850000
96 #define AS_FLASH_TIMEOUT_STEP 50000
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
103 #define AS_TORCH_INTENSITY_MIN 20000 /* uA */
104 #define AS_TORCH_INTENSITY_MAX 160000
105 #define AS_TORCH_INTENSITY_STEP 20000
107 #define AS_INDICATOR_INTENSITY_MIN 0 /* uA */
108 #define AS_INDICATOR_INTENSITY_MAX 10000
109 #define AS_INDICATOR_INTENSITY_STEP 2500
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)
115 /* LED numbers for Devicetree */
116 #define AS_LED_FLASH 0
117 #define AS_LED_INDICATOR 1
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,
126 struct as3645a_config {
127 u32 flash_timeout_us;
130 u32 indicator_max_ua;
131 u32 voltage_reference;
135 struct as3645a_names {
141 struct i2c_client *client;
145 struct led_classdev_flash fled;
146 struct led_classdev iled_cdev;
148 struct v4l2_flash *vf;
149 struct v4l2_flash *vfind;
151 struct fwnode_handle *flash_node;
152 struct fwnode_handle *indicator_node;
154 struct as3645a_config cfg;
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;
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)
168 /* Return negative errno else zero on success */
169 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
171 struct i2c_client *client = flash->client;
174 rval = i2c_smbus_write_byte_data(client, addr, val);
176 dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
177 rval < 0 ? "fail" : "ok");
182 /* Return negative errno else a data byte received from the device. */
183 static int as3645a_read(struct as3645a *flash, u8 addr)
185 struct i2c_client *client = flash->client;
188 rval = i2c_smbus_read_byte_data(client, addr);
190 dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
191 rval < 0 ? "fail" : "ok");
196 /* -----------------------------------------------------------------------------
197 * Hardware configuration and trigger
201 * as3645a_set_config - Set flash configuration registers
204 * Configure the hardware with flash, assist and indicator currents, as well as
207 * Return 0 on success, or a negative error code if an I2C communication error
210 static int as3645a_set_current(struct as3645a *flash)
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;
218 return as3645a_write(flash, AS_CURRENT_SET_REG, val);
221 static int as3645a_set_timeout(struct as3645a *flash)
225 val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
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);
232 return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
236 * as3645a_set_control - Set flash control register
238 * @mode: Desired output mode
239 * @on: Desired output state
241 * Configure the hardware with output mode and state.
243 * Return 0 on success, or a negative error code if an I2C communication error
247 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
251 /* Configure output parameters and operation mode. */
252 reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
253 | (on ? AS_CONTROL_OUT_ON : 0)
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;
261 return as3645a_write(flash, AS_CONTROL_REG, reg);
264 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
266 struct as3645a *flash = fled_to_as3645a(fled);
269 /* NOTE: reading register clears fault status */
270 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
274 if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
275 *fault |= LED_FAULT_OVER_CURRENT;
277 if (rval & AS_FAULT_INFO_INDICATOR_LED)
278 *fault |= LED_FAULT_INDICATOR;
280 dev_dbg(&flash->client->dev, "%u connected LEDs\n",
281 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
283 if (rval & AS_FAULT_INFO_TIMEOUT)
284 *fault |= LED_FAULT_TIMEOUT;
286 if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
287 *fault |= LED_FAULT_OVER_TEMPERATURE;
289 if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
290 *fault |= LED_FAULT_OVER_CURRENT;
292 if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
293 *fault |= LED_FAULT_INPUT_VOLTAGE;
298 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
308 return (val - min) / step;
311 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
315 return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
316 flash->cfg.assist_max_ua,
317 AS_TORCH_INTENSITY_STEP, ua);
319 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
320 flash->cfg.flash_max_ua,
321 AS_FLASH_INTENSITY_STEP, ua);
324 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
325 enum led_brightness brightness)
327 struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
330 flash->indicator_current = brightness;
332 rval = as3645a_set_timeout(flash);
336 return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
339 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
340 enum led_brightness brightness)
342 struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
343 struct as3645a *flash = fled_to_as3645a(fled);
347 /* Register value 0 is 20 mA. */
348 flash->assist_current = brightness - 1;
350 rval = as3645a_set_current(flash);
355 return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
358 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
361 struct as3645a *flash = fled_to_as3645a(fled);
363 flash->flash_current = as3645a_current_to_reg(flash, true,
366 return as3645a_set_current(flash);
369 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
372 struct as3645a *flash = fled_to_as3645a(fled);
374 flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
376 return as3645a_set_timeout(flash);
379 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
381 struct as3645a *flash = fled_to_as3645a(fled);
383 return as3645a_set_control(flash, AS_MODE_FLASH, state);
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,
393 static int as3645a_setup(struct as3645a *flash)
395 struct device *dev = &flash->client->dev;
400 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
404 dev_dbg(dev, "Fault info: %02x\n", rval);
406 rval = as3645a_set_current(flash);
410 rval = as3645a_set_timeout(flash);
414 rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
419 rval = as3645a_get_fault(&flash->fled, &fault);
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));
430 return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
433 static int as3645a_detect(struct as3645a *flash)
435 struct device *dev = &flash->client->dev;
436 int rval, man, model, rfu, version;
439 rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
441 dev_err(dev, "can't read design info reg\n");
445 man = AS_DESIGN_INFO_FACTORY(rval);
446 model = AS_DESIGN_INFO_MODEL(rval);
448 rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
450 dev_err(dev, "can't read version control reg\n");
454 rfu = AS_VERSION_CONTROL_RFU(rval);
455 version = AS_VERSION_CONTROL_VERSION(rval);
457 /* Verify the chip model and version. */
458 if (model != 0x01 || rfu != 0x00) {
459 dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
466 vendor = "AMS, Austria Micro Systems";
469 vendor = "ADI, Analog Devices Inc.";
472 vendor = "NSC, National Semiconductor";
478 vendor = "TI, Texas Instrument";
484 dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
487 rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
491 return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
494 static int as3645a_parse_node(struct as3645a *flash,
495 struct as3645a_names *names,
496 struct fwnode_handle *fwnode)
498 struct as3645a_config *cfg = &flash->cfg;
499 struct fwnode_handle *child;
503 fwnode_for_each_child_node(fwnode, child) {
506 fwnode_property_read_u32(child, "reg", &id);
510 flash->flash_node = child;
512 case AS_LED_INDICATOR:
513 flash->indicator_node = child;
516 dev_warn(&flash->client->dev,
517 "unknown LED %u encountered, ignoring\n", id);
520 fwnode_handle_get(child);
523 if (!flash->flash_node) {
524 dev_err(&flash->client->dev, "can't find flash node\n");
528 rval = fwnode_property_read_string(flash->flash_node, "label", &name);
530 strlcpy(names->flash, name, sizeof(names->flash));
531 } else if (is_of_node(fwnode)) {
532 snprintf(names->flash, sizeof(names->flash),
533 "%pOFn:flash", to_of_node(fwnode));
535 dev_err(&flash->client->dev, "flash node has no label!\n");
539 rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
540 &cfg->flash_timeout_us);
542 dev_err(&flash->client->dev,
543 "can't read flash-timeout-us property for flash\n");
547 rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
550 dev_err(&flash->client->dev,
551 "can't read flash-max-microamp property for flash\n");
555 rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
556 &cfg->assist_max_ua);
558 dev_err(&flash->client->dev,
559 "can't read led-max-microamp property for flash\n");
563 fwnode_property_read_u32(flash->flash_node, "voltage-reference",
564 &cfg->voltage_reference);
566 fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
568 cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
570 if (!flash->indicator_node) {
571 dev_warn(&flash->client->dev,
572 "can't find indicator node\n");
576 rval = fwnode_property_read_string(flash->indicator_node, "label",
579 strlcpy(names->indicator, name, sizeof(names->indicator));
580 } else if (is_of_node(fwnode)) {
581 snprintf(names->indicator, sizeof(names->indicator),
582 "%pOFn:indicator", to_of_node(fwnode));
584 dev_err(&flash->client->dev, "indicator node has no label!\n");
588 rval = fwnode_property_read_u32(flash->indicator_node,
590 &cfg->indicator_max_ua);
592 dev_err(&flash->client->dev,
593 "can't read led-max-microamp property for indicator\n");
600 fwnode_handle_put(flash->flash_node);
601 fwnode_handle_put(flash->indicator_node);
606 static int as3645a_led_class_setup(struct as3645a *flash,
607 struct as3645a_names *names)
609 struct led_classdev *fled_cdev = &flash->fled.led_cdev;
610 struct led_classdev *iled_cdev = &flash->iled_cdev;
611 struct led_flash_setting *cfg;
614 iled_cdev->name = names->indicator;
615 iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
616 iled_cdev->max_brightness =
617 flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
618 iled_cdev->flags = LED_CORE_SUSPENDRESUME;
620 rval = led_classdev_register(&flash->client->dev, iled_cdev);
624 cfg = &flash->fled.brightness;
625 cfg->min = AS_FLASH_INTENSITY_MIN;
626 cfg->max = flash->cfg.flash_max_ua;
627 cfg->step = AS_FLASH_INTENSITY_STEP;
628 cfg->val = flash->cfg.flash_max_ua;
630 cfg = &flash->fled.timeout;
631 cfg->min = AS_FLASH_TIMEOUT_MIN;
632 cfg->max = flash->cfg.flash_timeout_us;
633 cfg->step = AS_FLASH_TIMEOUT_STEP;
634 cfg->val = flash->cfg.flash_timeout_us;
636 flash->fled.ops = &as3645a_led_flash_ops;
638 fled_cdev->name = names->flash;
639 fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
640 /* Value 0 is off in LED class. */
641 fled_cdev->max_brightness =
642 as3645a_current_to_reg(flash, false,
643 flash->cfg.assist_max_ua) + 1;
644 fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
646 rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
648 led_classdev_unregister(iled_cdev);
649 dev_err(&flash->client->dev,
650 "led_classdev_flash_register() failed, error %d\n",
657 static int as3645a_v4l2_setup(struct as3645a *flash)
659 struct led_classdev_flash *fled = &flash->fled;
660 struct led_classdev *led = &fled->led_cdev;
661 struct v4l2_flash_config cfg = {
663 .min = AS_TORCH_INTENSITY_MIN,
664 .max = flash->cfg.assist_max_ua,
665 .step = AS_TORCH_INTENSITY_STEP,
666 .val = flash->cfg.assist_max_ua,
669 struct v4l2_flash_config cfgind = {
671 .min = AS_INDICATOR_INTENSITY_MIN,
672 .max = flash->cfg.indicator_max_ua,
673 .step = AS_INDICATOR_INTENSITY_STEP,
674 .val = flash->cfg.indicator_max_ua,
678 strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
679 strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
681 flash->vf = v4l2_flash_init(
682 &flash->client->dev, flash->flash_node, &flash->fled, NULL,
684 if (IS_ERR(flash->vf))
685 return PTR_ERR(flash->vf);
687 flash->vfind = v4l2_flash_indicator_init(
688 &flash->client->dev, flash->indicator_node, &flash->iled_cdev,
690 if (IS_ERR(flash->vfind)) {
691 v4l2_flash_release(flash->vf);
692 return PTR_ERR(flash->vfind);
698 static int as3645a_probe(struct i2c_client *client)
700 struct as3645a_names names;
701 struct as3645a *flash;
704 if (!dev_fwnode(&client->dev))
707 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
711 flash->client = client;
713 rval = as3645a_parse_node(flash, &names, dev_fwnode(&client->dev));
717 rval = as3645a_detect(flash);
721 mutex_init(&flash->mutex);
722 i2c_set_clientdata(client, flash);
724 rval = as3645a_setup(flash);
726 goto out_mutex_destroy;
728 rval = as3645a_led_class_setup(flash, &names);
730 goto out_mutex_destroy;
732 rval = as3645a_v4l2_setup(flash);
734 goto out_led_classdev_flash_unregister;
738 out_led_classdev_flash_unregister:
739 led_classdev_flash_unregister(&flash->fled);
742 mutex_destroy(&flash->mutex);
745 fwnode_handle_put(flash->flash_node);
746 fwnode_handle_put(flash->indicator_node);
751 static int as3645a_remove(struct i2c_client *client)
753 struct as3645a *flash = i2c_get_clientdata(client);
755 as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
757 v4l2_flash_release(flash->vf);
758 v4l2_flash_release(flash->vfind);
760 led_classdev_flash_unregister(&flash->fled);
761 led_classdev_unregister(&flash->iled_cdev);
763 mutex_destroy(&flash->mutex);
765 fwnode_handle_put(flash->flash_node);
766 fwnode_handle_put(flash->indicator_node);
771 static const struct i2c_device_id as3645a_id_table[] = {
775 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
777 static const struct of_device_id as3645a_of_table[] = {
778 { .compatible = "ams,as3645a" },
781 MODULE_DEVICE_TABLE(of, as3645a_of_table);
783 static struct i2c_driver as3645a_i2c_driver = {
785 .of_match_table = as3645a_of_table,
788 .probe_new = as3645a_probe,
789 .remove = as3645a_remove,
790 .id_table = as3645a_id_table,
793 module_i2c_driver(as3645a_i2c_driver);
795 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
796 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
797 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
798 MODULE_LICENSE("GPL v2");