1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2015-16 Golden Delicious Computers
4  *
5  * Author: Nikolaus Schaller <hns@goldelico.com>
6  *
7  * LED driver for the IS31FL319{0,1,3,6,9} to drive 1, 3, 6 or 9 light
8  * effect LEDs.
9  */
10 
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include <linux/leds.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/module.h>
16 #include <linux/property.h>
17 #include <linux/regmap.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/gpio/consumer.h>
21 
22 /* register numbers */
23 #define IS31FL319X_SHUTDOWN		0x00
24 
25 /* registers for 3190, 3191 and 3193 */
26 #define IS31FL3190_BREATHING		0x01
27 #define IS31FL3190_LEDMODE		0x02
28 #define IS31FL3190_CURRENT		0x03
29 #define IS31FL3190_PWM(channel)		(0x04 + channel)
30 #define IS31FL3190_DATA_UPDATE		0x07
31 #define IS31FL3190_T0(channel)		(0x0a + channel)
32 #define IS31FL3190_T1T2(channel)	(0x10 + channel)
33 #define IS31FL3190_T3T4(channel)	(0x16 + channel)
34 #define IS31FL3190_TIME_UPDATE		0x1c
35 #define IS31FL3190_LEDCONTROL		0x1d
36 #define IS31FL3190_RESET		0x2f
37 
38 #define IS31FL3190_CURRENT_uA_MIN	5000
39 #define IS31FL3190_CURRENT_uA_DEFAULT	42000
40 #define IS31FL3190_CURRENT_uA_MAX	42000
41 #define IS31FL3190_CURRENT_SHIFT	2
42 #define IS31FL3190_CURRENT_MASK		GENMASK(4, 2)
43 #define IS31FL3190_CURRENT_5_mA		0x02
44 #define IS31FL3190_CURRENT_10_mA	0x01
45 #define IS31FL3190_CURRENT_17dot5_mA	0x04
46 #define IS31FL3190_CURRENT_30_mA	0x03
47 #define IS31FL3190_CURRENT_42_mA	0x00
48 
49 /* registers for 3196 and 3199 */
50 #define IS31FL3196_CTRL1		0x01
51 #define IS31FL3196_CTRL2		0x02
52 #define IS31FL3196_CONFIG1		0x03
53 #define IS31FL3196_CONFIG2		0x04
54 #define IS31FL3196_RAMP_MODE		0x05
55 #define IS31FL3196_BREATH_MARK		0x06
56 #define IS31FL3196_PWM(channel)		(0x07 + channel)
57 #define IS31FL3196_DATA_UPDATE		0x10
58 #define IS31FL3196_T0(channel)		(0x11 + channel)
59 #define IS31FL3196_T123_1		0x1a
60 #define IS31FL3196_T123_2		0x1b
61 #define IS31FL3196_T123_3		0x1c
62 #define IS31FL3196_T4(channel)		(0x1d + channel)
63 #define IS31FL3196_TIME_UPDATE		0x26
64 #define IS31FL3196_RESET		0xff
65 
66 #define IS31FL3196_REG_CNT		(IS31FL3196_RESET + 1)
67 
68 #define IS31FL319X_MAX_LEDS		9
69 
70 /* CS (Current Setting) in CONFIG2 register */
71 #define IS31FL3196_CONFIG2_CS_SHIFT	4
72 #define IS31FL3196_CONFIG2_CS_MASK	GENMASK(2, 0)
73 #define IS31FL3196_CONFIG2_CS_STEP_REF	12
74 
75 #define IS31FL3196_CURRENT_uA_MIN	5000
76 #define IS31FL3196_CURRENT_uA_MAX	40000
77 #define IS31FL3196_CURRENT_uA_STEP	5000
78 #define IS31FL3196_CURRENT_uA_DEFAULT	20000
79 
80 /* Audio gain in CONFIG2 register */
81 #define IS31FL3196_AUDIO_GAIN_DB_MAX	((u32)21)
82 #define IS31FL3196_AUDIO_GAIN_DB_STEP	3
83 
84 /*
85  * regmap is used as a cache of chip's register space,
86  * to avoid reading back brightness values from chip,
87  * which is known to hang.
88  */
89 struct is31fl319x_chip {
90 	const struct is31fl319x_chipdef *cdef;
91 	struct i2c_client               *client;
92 	struct gpio_desc		*shutdown_gpio;
93 	struct regmap                   *regmap;
94 	struct mutex                    lock;
95 	u32                             audio_gain_db;
96 
97 	struct is31fl319x_led {
98 		struct is31fl319x_chip  *chip;
99 		struct led_classdev     cdev;
100 		u32                     max_microamp;
101 		bool                    configured;
102 	} leds[IS31FL319X_MAX_LEDS];
103 };
104 
105 struct is31fl319x_chipdef {
106 	int num_leds;
107 	u8 reset_reg;
108 	const struct regmap_config *is31fl319x_regmap_config;
109 	int (*brightness_set)(struct led_classdev *cdev, enum led_brightness brightness);
110 	u32 current_default;
111 	u32 current_min;
112 	u32 current_max;
113 	bool is_3196or3199;
114 };
115 
is31fl319x_readable_reg(struct device * dev,unsigned int reg)116 static bool is31fl319x_readable_reg(struct device *dev, unsigned int reg)
117 {
118 	/* we have no readable registers */
119 	return false;
120 }
121 
is31fl3190_volatile_reg(struct device * dev,unsigned int reg)122 static bool is31fl3190_volatile_reg(struct device *dev, unsigned int reg)
123 {
124 	/* volatile registers are not cached */
125 	switch (reg) {
126 	case IS31FL3190_DATA_UPDATE:
127 	case IS31FL3190_TIME_UPDATE:
128 	case IS31FL3190_RESET:
129 		return true; /* always write-through */
130 	default:
131 		return false;
132 	}
133 }
134 
135 static const struct reg_default is31fl3190_reg_defaults[] = {
136 	{ IS31FL3190_LEDMODE, 0x00 },
137 	{ IS31FL3190_CURRENT, 0x00 },
138 	{ IS31FL3190_PWM(0), 0x00 },
139 	{ IS31FL3190_PWM(1), 0x00 },
140 	{ IS31FL3190_PWM(2), 0x00 },
141 };
142 
143 static struct regmap_config is31fl3190_regmap_config = {
144 	.reg_bits = 8,
145 	.val_bits = 8,
146 	.max_register = IS31FL3190_RESET,
147 	.cache_type = REGCACHE_FLAT,
148 	.readable_reg = is31fl319x_readable_reg,
149 	.volatile_reg = is31fl3190_volatile_reg,
150 	.reg_defaults = is31fl3190_reg_defaults,
151 	.num_reg_defaults = ARRAY_SIZE(is31fl3190_reg_defaults),
152 };
153 
is31fl3196_volatile_reg(struct device * dev,unsigned int reg)154 static bool is31fl3196_volatile_reg(struct device *dev, unsigned int reg)
155 {
156 	/* volatile registers are not cached */
157 	switch (reg) {
158 	case IS31FL3196_DATA_UPDATE:
159 	case IS31FL3196_TIME_UPDATE:
160 	case IS31FL3196_RESET:
161 		return true; /* always write-through */
162 	default:
163 		return false;
164 	}
165 }
166 
167 static const struct reg_default is31fl3196_reg_defaults[] = {
168 	{ IS31FL3196_CONFIG1, 0x00 },
169 	{ IS31FL3196_CONFIG2, 0x00 },
170 	{ IS31FL3196_PWM(0), 0x00 },
171 	{ IS31FL3196_PWM(1), 0x00 },
172 	{ IS31FL3196_PWM(2), 0x00 },
173 	{ IS31FL3196_PWM(3), 0x00 },
174 	{ IS31FL3196_PWM(4), 0x00 },
175 	{ IS31FL3196_PWM(5), 0x00 },
176 	{ IS31FL3196_PWM(6), 0x00 },
177 	{ IS31FL3196_PWM(7), 0x00 },
178 	{ IS31FL3196_PWM(8), 0x00 },
179 };
180 
181 static struct regmap_config is31fl3196_regmap_config = {
182 	.reg_bits = 8,
183 	.val_bits = 8,
184 	.max_register = IS31FL3196_REG_CNT,
185 	.cache_type = REGCACHE_FLAT,
186 	.readable_reg = is31fl319x_readable_reg,
187 	.volatile_reg = is31fl3196_volatile_reg,
188 	.reg_defaults = is31fl3196_reg_defaults,
189 	.num_reg_defaults = ARRAY_SIZE(is31fl3196_reg_defaults),
190 };
191 
is31fl3190_brightness_set(struct led_classdev * cdev,enum led_brightness brightness)192 static int is31fl3190_brightness_set(struct led_classdev *cdev,
193 				     enum led_brightness brightness)
194 {
195 	struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev);
196 	struct is31fl319x_chip *is31 = led->chip;
197 	int chan = led - is31->leds;
198 	int ret;
199 	int i;
200 	u8 ctrl = 0;
201 
202 	dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness);
203 
204 	mutex_lock(&is31->lock);
205 
206 	/* update PWM register */
207 	ret = regmap_write(is31->regmap, IS31FL3190_PWM(chan), brightness);
208 	if (ret < 0)
209 		goto out;
210 
211 	/* read current brightness of all PWM channels */
212 	for (i = 0; i < is31->cdef->num_leds; i++) {
213 		unsigned int pwm_value;
214 		bool on;
215 
216 		/*
217 		 * since neither cdev nor the chip can provide
218 		 * the current setting, we read from the regmap cache
219 		 */
220 
221 		ret = regmap_read(is31->regmap, IS31FL3190_PWM(i), &pwm_value);
222 		on = ret >= 0 && pwm_value > LED_OFF;
223 
224 		ctrl |= on << i;
225 	}
226 
227 	if (ctrl > 0) {
228 		dev_dbg(&is31->client->dev, "power up %02x\n", ctrl);
229 		regmap_write(is31->regmap, IS31FL3190_LEDCONTROL, ctrl);
230 		/* update PWMs */
231 		regmap_write(is31->regmap, IS31FL3190_DATA_UPDATE, 0x00);
232 		/* enable chip from shut down and enable all channels */
233 		ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x20);
234 	} else {
235 		dev_dbg(&is31->client->dev, "power down\n");
236 		/* shut down (no need to clear LEDCONTROL) */
237 		ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01);
238 	}
239 
240 out:
241 	mutex_unlock(&is31->lock);
242 
243 	return ret;
244 }
245 
is31fl3196_brightness_set(struct led_classdev * cdev,enum led_brightness brightness)246 static int is31fl3196_brightness_set(struct led_classdev *cdev,
247 				     enum led_brightness brightness)
248 {
249 	struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev);
250 	struct is31fl319x_chip *is31 = led->chip;
251 	int chan = led - is31->leds;
252 	int ret;
253 	int i;
254 	u8 ctrl1 = 0, ctrl2 = 0;
255 
256 	dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness);
257 
258 	mutex_lock(&is31->lock);
259 
260 	/* update PWM register */
261 	ret = regmap_write(is31->regmap, IS31FL3196_PWM(chan), brightness);
262 	if (ret < 0)
263 		goto out;
264 
265 	/* read current brightness of all PWM channels */
266 	for (i = 0; i < is31->cdef->num_leds; i++) {
267 		unsigned int pwm_value;
268 		bool on;
269 
270 		/*
271 		 * since neither cdev nor the chip can provide
272 		 * the current setting, we read from the regmap cache
273 		 */
274 
275 		ret = regmap_read(is31->regmap, IS31FL3196_PWM(i), &pwm_value);
276 		on = ret >= 0 && pwm_value > LED_OFF;
277 
278 		if (i < 3)
279 			ctrl1 |= on << i;       /* 0..2 => bit 0..2 */
280 		else if (i < 6)
281 			ctrl1 |= on << (i + 1); /* 3..5 => bit 4..6 */
282 		else
283 			ctrl2 |= on << (i - 6); /* 6..8 => bit 0..2 */
284 	}
285 
286 	if (ctrl1 > 0 || ctrl2 > 0) {
287 		dev_dbg(&is31->client->dev, "power up %02x %02x\n",
288 			ctrl1, ctrl2);
289 		regmap_write(is31->regmap, IS31FL3196_CTRL1, ctrl1);
290 		regmap_write(is31->regmap, IS31FL3196_CTRL2, ctrl2);
291 		/* update PWMs */
292 		regmap_write(is31->regmap, IS31FL3196_DATA_UPDATE, 0x00);
293 		/* enable chip from shut down */
294 		ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01);
295 	} else {
296 		dev_dbg(&is31->client->dev, "power down\n");
297 		/* shut down (no need to clear CTRL1/2) */
298 		ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00);
299 	}
300 
301 out:
302 	mutex_unlock(&is31->lock);
303 
304 	return ret;
305 }
306 
307 static const struct is31fl319x_chipdef is31fl3190_cdef = {
308 	.num_leds = 1,
309 	.reset_reg = IS31FL3190_RESET,
310 	.is31fl319x_regmap_config = &is31fl3190_regmap_config,
311 	.brightness_set = is31fl3190_brightness_set,
312 	.current_default = IS31FL3190_CURRENT_uA_DEFAULT,
313 	.current_min = IS31FL3190_CURRENT_uA_MIN,
314 	.current_max = IS31FL3190_CURRENT_uA_MAX,
315 	.is_3196or3199 = false,
316 };
317 
318 static const struct is31fl319x_chipdef is31fl3193_cdef = {
319 	.num_leds = 3,
320 	.reset_reg = IS31FL3190_RESET,
321 	.is31fl319x_regmap_config = &is31fl3190_regmap_config,
322 	.brightness_set = is31fl3190_brightness_set,
323 	.current_default = IS31FL3190_CURRENT_uA_DEFAULT,
324 	.current_min = IS31FL3190_CURRENT_uA_MIN,
325 	.current_max = IS31FL3190_CURRENT_uA_MAX,
326 	.is_3196or3199 = false,
327 };
328 
329 static const struct is31fl319x_chipdef is31fl3196_cdef = {
330 	.num_leds = 6,
331 	.reset_reg = IS31FL3196_RESET,
332 	.is31fl319x_regmap_config = &is31fl3196_regmap_config,
333 	.brightness_set = is31fl3196_brightness_set,
334 	.current_default = IS31FL3196_CURRENT_uA_DEFAULT,
335 	.current_min = IS31FL3196_CURRENT_uA_MIN,
336 	.current_max = IS31FL3196_CURRENT_uA_MAX,
337 	.is_3196or3199 = true,
338 };
339 
340 static const struct is31fl319x_chipdef is31fl3199_cdef = {
341 	.num_leds = 9,
342 	.reset_reg = IS31FL3196_RESET,
343 	.is31fl319x_regmap_config = &is31fl3196_regmap_config,
344 	.brightness_set = is31fl3196_brightness_set,
345 	.current_default = IS31FL3196_CURRENT_uA_DEFAULT,
346 	.current_min = IS31FL3196_CURRENT_uA_MIN,
347 	.current_max = IS31FL3196_CURRENT_uA_MAX,
348 	.is_3196or3199 = true,
349 };
350 
351 static const struct of_device_id of_is31fl319x_match[] = {
352 	{ .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, },
353 	{ .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, },
354 	{ .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, },
355 	{ .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, },
356 	{ .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, },
357 	{ .compatible = "si-en,sn3190",    .data = &is31fl3190_cdef, },
358 	{ .compatible = "si-en,sn3191",    .data = &is31fl3190_cdef, },
359 	{ .compatible = "si-en,sn3193",    .data = &is31fl3193_cdef, },
360 	{ .compatible = "si-en,sn3196",    .data = &is31fl3196_cdef, },
361 	{ .compatible = "si-en,sn3199",    .data = &is31fl3199_cdef, },
362 	{ }
363 };
364 MODULE_DEVICE_TABLE(of, of_is31fl319x_match);
365 
is31fl319x_parse_child_fw(const struct device * dev,const struct fwnode_handle * child,struct is31fl319x_led * led,struct is31fl319x_chip * is31)366 static int is31fl319x_parse_child_fw(const struct device *dev,
367 				     const struct fwnode_handle *child,
368 				     struct is31fl319x_led *led,
369 				     struct is31fl319x_chip *is31)
370 {
371 	struct led_classdev *cdev = &led->cdev;
372 	int ret;
373 
374 	if (fwnode_property_read_string(child, "label", &cdev->name))
375 		cdev->name = fwnode_get_name(child);
376 
377 	ret = fwnode_property_read_string(child, "linux,default-trigger", &cdev->default_trigger);
378 	if (ret < 0 && ret != -EINVAL) /* is optional */
379 		return ret;
380 
381 	led->max_microamp = is31->cdef->current_default;
382 	ret = fwnode_property_read_u32(child, "led-max-microamp", &led->max_microamp);
383 	if (!ret) {
384 		if (led->max_microamp < is31->cdef->current_min)
385 			return -EINVAL;	/* not supported */
386 		led->max_microamp = min(led->max_microamp,
387 					is31->cdef->current_max);
388 	}
389 
390 	return 0;
391 }
392 
is31fl319x_parse_fw(struct device * dev,struct is31fl319x_chip * is31)393 static int is31fl319x_parse_fw(struct device *dev, struct is31fl319x_chip *is31)
394 {
395 	struct fwnode_handle *fwnode = dev_fwnode(dev), *child;
396 	int count;
397 	int ret;
398 
399 	is31->shutdown_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
400 	if (IS_ERR(is31->shutdown_gpio))
401 		return dev_err_probe(dev, PTR_ERR(is31->shutdown_gpio),
402 				     "Failed to get shutdown gpio\n");
403 
404 	is31->cdef = device_get_match_data(dev);
405 
406 	count = 0;
407 	fwnode_for_each_available_child_node(fwnode, child)
408 		count++;
409 
410 	dev_dbg(dev, "probing with %d leds defined in DT\n", count);
411 
412 	if (!count || count > is31->cdef->num_leds)
413 		return dev_err_probe(dev, -ENODEV,
414 				     "Number of leds defined must be between 1 and %u\n",
415 				     is31->cdef->num_leds);
416 
417 	fwnode_for_each_available_child_node(fwnode, child) {
418 		struct is31fl319x_led *led;
419 		u32 reg;
420 
421 		ret = fwnode_property_read_u32(child, "reg", &reg);
422 		if (ret) {
423 			ret = dev_err_probe(dev, ret, "Failed to read led 'reg' property\n");
424 			goto put_child_node;
425 		}
426 
427 		if (reg < 1 || reg > is31->cdef->num_leds) {
428 			ret = dev_err_probe(dev, -EINVAL, "invalid led reg %u\n", reg);
429 			goto put_child_node;
430 		}
431 
432 		led = &is31->leds[reg - 1];
433 
434 		if (led->configured) {
435 			ret = dev_err_probe(dev, -EINVAL, "led %u is already configured\n", reg);
436 			goto put_child_node;
437 		}
438 
439 		ret = is31fl319x_parse_child_fw(dev, child, led, is31);
440 		if (ret) {
441 			ret = dev_err_probe(dev, ret, "led %u DT parsing failed\n", reg);
442 			goto put_child_node;
443 		}
444 
445 		led->configured = true;
446 	}
447 
448 	is31->audio_gain_db = 0;
449 	if (is31->cdef->is_3196or3199) {
450 		ret = fwnode_property_read_u32(fwnode, "audio-gain-db", &is31->audio_gain_db);
451 		if (!ret)
452 			is31->audio_gain_db = min(is31->audio_gain_db,
453 						  IS31FL3196_AUDIO_GAIN_DB_MAX);
454 	}
455 
456 	return 0;
457 
458 put_child_node:
459 	fwnode_handle_put(child);
460 	return ret;
461 }
462 
is31fl3190_microamp_to_cs(struct device * dev,u32 microamp)463 static inline int is31fl3190_microamp_to_cs(struct device *dev, u32 microamp)
464 {
465 	switch (microamp) {
466 	case 5000:
467 		return IS31FL3190_CURRENT_5_mA;
468 	case 10000:
469 		return IS31FL3190_CURRENT_10_mA;
470 	case 17500:
471 		return IS31FL3190_CURRENT_17dot5_mA;
472 	case 30000:
473 		return IS31FL3190_CURRENT_30_mA;
474 	case 42000:
475 		return IS31FL3190_CURRENT_42_mA;
476 	default:
477 		dev_warn(dev, "Unsupported current value: %d, using 5000 µA!\n", microamp);
478 		return IS31FL3190_CURRENT_5_mA;
479 	}
480 }
481 
is31fl3196_microamp_to_cs(struct device * dev,u32 microamp)482 static inline int is31fl3196_microamp_to_cs(struct device *dev, u32 microamp)
483 {
484 	/* round down to nearest supported value (range check done by caller) */
485 	u32 step = microamp / IS31FL3196_CURRENT_uA_STEP;
486 
487 	return ((IS31FL3196_CONFIG2_CS_STEP_REF - step) &
488 		IS31FL3196_CONFIG2_CS_MASK) <<
489 		IS31FL3196_CONFIG2_CS_SHIFT; /* CS encoding */
490 }
491 
is31fl3196_db_to_gain(u32 dezibel)492 static inline int is31fl3196_db_to_gain(u32 dezibel)
493 {
494 	/* round down to nearest supported value (range check done by caller) */
495 	return dezibel / IS31FL3196_AUDIO_GAIN_DB_STEP;
496 }
497 
is31f1319x_mutex_destroy(void * lock)498 static void is31f1319x_mutex_destroy(void *lock)
499 {
500 	mutex_destroy(lock);
501 }
502 
is31fl319x_probe(struct i2c_client * client)503 static int is31fl319x_probe(struct i2c_client *client)
504 {
505 	struct is31fl319x_chip *is31;
506 	struct device *dev = &client->dev;
507 	int err;
508 	int i = 0;
509 	u32 aggregated_led_microamp;
510 
511 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
512 		return -EIO;
513 
514 	is31 = devm_kzalloc(&client->dev, sizeof(*is31), GFP_KERNEL);
515 	if (!is31)
516 		return -ENOMEM;
517 
518 	mutex_init(&is31->lock);
519 	err = devm_add_action_or_reset(dev, is31f1319x_mutex_destroy, &is31->lock);
520 	if (err)
521 		return err;
522 
523 	err = is31fl319x_parse_fw(&client->dev, is31);
524 	if (err)
525 		return err;
526 
527 	if (is31->shutdown_gpio) {
528 		gpiod_direction_output(is31->shutdown_gpio, 0);
529 		mdelay(5);
530 		gpiod_direction_output(is31->shutdown_gpio, 1);
531 	}
532 
533 	is31->client = client;
534 	is31->regmap = devm_regmap_init_i2c(client, is31->cdef->is31fl319x_regmap_config);
535 	if (IS_ERR(is31->regmap))
536 		return dev_err_probe(dev, PTR_ERR(is31->regmap), "failed to allocate register map\n");
537 
538 	i2c_set_clientdata(client, is31);
539 
540 	/* check for write-reply from chip (we can't read any registers) */
541 	err = regmap_write(is31->regmap, is31->cdef->reset_reg, 0x00);
542 	if (err < 0)
543 		return dev_err_probe(dev, err, "no response from chip write\n");
544 
545 	/*
546 	 * Kernel conventions require per-LED led-max-microamp property.
547 	 * But the chip does not allow to limit individual LEDs.
548 	 * So we take minimum from all subnodes for safety of hardware.
549 	 */
550 	aggregated_led_microamp = is31->cdef->current_max;
551 	for (i = 0; i < is31->cdef->num_leds; i++)
552 		if (is31->leds[i].configured &&
553 		    is31->leds[i].max_microamp < aggregated_led_microamp)
554 			aggregated_led_microamp = is31->leds[i].max_microamp;
555 
556 	if (is31->cdef->is_3196or3199)
557 		regmap_write(is31->regmap, IS31FL3196_CONFIG2,
558 			     is31fl3196_microamp_to_cs(dev, aggregated_led_microamp) |
559 			     is31fl3196_db_to_gain(is31->audio_gain_db));
560 	else
561 		regmap_update_bits(is31->regmap, IS31FL3190_CURRENT, IS31FL3190_CURRENT_MASK,
562 				   is31fl3190_microamp_to_cs(dev, aggregated_led_microamp) << IS31FL3190_CURRENT_SHIFT);
563 
564 	for (i = 0; i < is31->cdef->num_leds; i++) {
565 		struct is31fl319x_led *led = &is31->leds[i];
566 
567 		if (!led->configured)
568 			continue;
569 
570 		led->chip = is31;
571 		led->cdev.brightness_set_blocking = is31->cdef->brightness_set;
572 
573 		err = devm_led_classdev_register(&client->dev, &led->cdev);
574 		if (err < 0)
575 			return err;
576 	}
577 
578 	return 0;
579 }
580 
581 /*
582  * i2c-core (and modalias) requires that id_table be properly filled,
583  * even though it is not used for DeviceTree based instantiation.
584  */
585 static const struct i2c_device_id is31fl319x_id[] = {
586 	{ "is31fl3190" },
587 	{ "is31fl3191" },
588 	{ "is31fl3193" },
589 	{ "is31fl3196" },
590 	{ "is31fl3199" },
591 	{ "sn3190" },
592 	{ "sn3191" },
593 	{ "sn3193" },
594 	{ "sn3196" },
595 	{ "sn3199" },
596 	{},
597 };
598 MODULE_DEVICE_TABLE(i2c, is31fl319x_id);
599 
600 static struct i2c_driver is31fl319x_driver = {
601 	.driver   = {
602 		.name           = "leds-is31fl319x",
603 		.of_match_table = of_is31fl319x_match,
604 	},
605 	.probe = is31fl319x_probe,
606 	.id_table = is31fl319x_id,
607 };
608 
609 module_i2c_driver(is31fl319x_driver);
610 
611 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
612 MODULE_AUTHOR("Andrey Utkin <andrey_utkin@fastmail.com>");
613 MODULE_DESCRIPTION("IS31FL319X LED driver");
614 MODULE_LICENSE("GPL v2");
615