xref: /linux/drivers/leds/leds-mt6323.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * LED driver for Mediatek MT6323 PMIC
4  *
5  * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com>
6  */
7 #include <linux/kernel.h>
8 #include <linux/leds.h>
9 #include <linux/mfd/mt6323/registers.h>
10 #include <linux/mfd/mt6397/core.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 
16 /*
17  * Register field for TOP_CKPDN0 to enable
18  * 32K clock common for LED device.
19  */
20 #define RG_DRV_32K_CK_PDN		BIT(11)
21 #define RG_DRV_32K_CK_PDN_MASK		BIT(11)
22 
23 /* 32K/1M/6M clock common for WLED device */
24 #define RG_VWLED_1M_CK_PDN		BIT(0)
25 #define RG_VWLED_32K_CK_PDN		BIT(12)
26 #define RG_VWLED_6M_CK_PDN		BIT(13)
27 
28 /*
29  * Register field for TOP_CKPDN2 to enable
30  * individual clock for LED device.
31  */
32 #define RG_ISINK_CK_PDN(i)	BIT(i)
33 #define RG_ISINK_CK_PDN_MASK(i)	BIT(i)
34 
35 /*
36  * Register field for TOP_CKCON1 to select
37  * clock source.
38  */
39 #define RG_ISINK_CK_SEL_MASK(i)	(BIT(10) << (i))
40 
41 #define ISINK_CON(r, i)		(r + 0x8 * (i))
42 
43 /* ISINK_CON0: Register to setup the duty cycle of the blink. */
44 #define ISINK_DIM_DUTY_MASK	(0x1f << 8)
45 #define ISINK_DIM_DUTY(i)	(((i) << 8) & ISINK_DIM_DUTY_MASK)
46 
47 /* ISINK_CON1: Register to setup the period of the blink. */
48 #define ISINK_DIM_FSEL_MASK	(0xffff)
49 #define ISINK_DIM_FSEL(i)	((i) & ISINK_DIM_FSEL_MASK)
50 
51 /* ISINK_CON2: Register to control the brightness. */
52 #define ISINK_CH_STEP_SHIFT	12
53 #define ISINK_CH_STEP_MASK	(0x7 << 12)
54 #define ISINK_CH_STEP(i)	(((i) << 12) & ISINK_CH_STEP_MASK)
55 #define ISINK_SFSTR0_TC_MASK	(0x3 << 1)
56 #define ISINK_SFSTR0_TC(i)	(((i) << 1) & ISINK_SFSTR0_TC_MASK)
57 #define ISINK_SFSTR0_EN_MASK	BIT(0)
58 #define ISINK_SFSTR0_EN		BIT(0)
59 
60 /* Register to LED channel enablement. */
61 #define ISINK_CH_EN_MASK(i)	BIT(i)
62 #define ISINK_CH_EN(i)		BIT(i)
63 
64 #define MAX_SUPPORTED_LEDS		8
65 
66 struct mt6323_leds;
67 
68 /**
69  * struct mt6323_led - state container for the LED device
70  * @id:			the identifier in MT6323 LED device
71  * @parent:		the pointer to MT6323 LED controller
72  * @cdev:		LED class device for this LED device
73  * @current_brightness: current state of the LED device
74  */
75 struct mt6323_led {
76 	int			id;
77 	struct mt6323_leds	*parent;
78 	struct led_classdev	cdev;
79 	enum led_brightness	current_brightness;
80 };
81 
82 /**
83  * struct mt6323_regs - register spec for the LED device
84  * @top_ckpdn:		Offset to ISINK_CKPDN[0..x] registers
85  * @num_top_ckpdn:	Number of ISINK_CKPDN registers
86  * @top_ckcon:		Offset to ISINK_CKCON[0..x] registers
87  * @num_top_ckcon:	Number of ISINK_CKCON registers
88  * @isink_con:		Offset to ISINKx_CON[0..x] registers
89  * @num_isink_con:	Number of ISINKx_CON registers
90  * @isink_max_regs:	Number of ISINK[0..x] registers
91  * @isink_en_ctrl:	Offset to ISINK_EN_CTRL register
92  * @iwled_en_ctrl:	Offset to IWLED_EN_CTRL register
93  */
94 struct mt6323_regs {
95 	const u16 *top_ckpdn;
96 	u8 num_top_ckpdn;
97 	const u16 *top_ckcon;
98 	u8 num_top_ckcon;
99 	const u16 *isink_con;
100 	u8 num_isink_con;
101 	u8 isink_max_regs;
102 	u16 isink_en_ctrl;
103 	u16 iwled_en_ctrl;
104 };
105 
106 /**
107  * struct mt6323_hwspec - hardware specific parameters
108  * @max_period:		Maximum period for all LEDs
109  * @max_leds:		Maximum number of supported LEDs
110  * @max_wleds:		Maximum number of WLEDs
111  * @max_brightness:	Maximum brightness for all LEDs
112  * @unit_duty:		Steps of duty per period
113  */
114 struct mt6323_hwspec {
115 	u16 max_period;
116 	u8 max_leds;
117 	u8 max_wleds;
118 	u16 max_brightness;
119 	u16 unit_duty;
120 };
121 
122 /**
123  * struct mt6323_data - device specific data
124  * @regs:		Register spec for this device
125  * @spec:		Hardware specific parameters
126  */
127 struct mt6323_data {
128 	const struct mt6323_regs *regs;
129 	const struct mt6323_hwspec *spec;
130 };
131 
132 /**
133  * struct mt6323_leds -	state container for holding LED controller
134  *			of the driver
135  * @dev:		the device pointer
136  * @hw:			the underlying hardware providing shared
137  *			bus for the register operations
138  * @pdata:		device specific data
139  * @lock:		the lock among process context
140  * @led:		the array that contains the state of individual
141  *			LED device
142  */
143 struct mt6323_leds {
144 	struct device		*dev;
145 	struct mt6397_chip	*hw;
146 	const struct mt6323_data *pdata;
147 	/* protect among process context */
148 	struct mutex		lock;
149 	struct mt6323_led	*led[MAX_SUPPORTED_LEDS];
150 };
151 
mt6323_led_hw_brightness(struct led_classdev * cdev,enum led_brightness brightness)152 static int mt6323_led_hw_brightness(struct led_classdev *cdev,
153 				    enum led_brightness brightness)
154 {
155 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
156 	struct mt6323_leds *leds = led->parent;
157 	const struct mt6323_regs *regs = leds->pdata->regs;
158 	struct regmap *regmap = leds->hw->regmap;
159 	u32 con2_mask = 0, con2_val = 0;
160 	int ret;
161 
162 	/*
163 	 * Setup current output for the corresponding
164 	 * brightness level.
165 	 */
166 	con2_mask |= ISINK_CH_STEP_MASK |
167 		     ISINK_SFSTR0_TC_MASK |
168 		     ISINK_SFSTR0_EN_MASK;
169 	con2_val |=  ISINK_CH_STEP(brightness - 1) |
170 		     ISINK_SFSTR0_TC(2) |
171 		     ISINK_SFSTR0_EN;
172 
173 	ret = regmap_update_bits(regmap, ISINK_CON(regs->isink_con[2], led->id),
174 				 con2_mask, con2_val);
175 	return ret;
176 }
177 
mt6323_led_hw_off(struct led_classdev * cdev)178 static int mt6323_led_hw_off(struct led_classdev *cdev)
179 {
180 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
181 	struct mt6323_leds *leds = led->parent;
182 	const struct mt6323_regs *regs = leds->pdata->regs;
183 	struct regmap *regmap = leds->hw->regmap;
184 	unsigned int status;
185 	int ret;
186 
187 	status = ISINK_CH_EN(led->id);
188 	ret = regmap_update_bits(regmap, regs->isink_en_ctrl,
189 				 ISINK_CH_EN_MASK(led->id), ~status);
190 	if (ret < 0)
191 		return ret;
192 
193 	usleep_range(100, 300);
194 	ret = regmap_update_bits(regmap, regs->top_ckpdn[2],
195 				 RG_ISINK_CK_PDN_MASK(led->id),
196 				 RG_ISINK_CK_PDN(led->id));
197 	if (ret < 0)
198 		return ret;
199 
200 	return 0;
201 }
202 
203 static enum led_brightness
mt6323_get_led_hw_brightness(struct led_classdev * cdev)204 mt6323_get_led_hw_brightness(struct led_classdev *cdev)
205 {
206 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
207 	struct mt6323_leds *leds = led->parent;
208 	const struct mt6323_regs *regs = leds->pdata->regs;
209 	struct regmap *regmap = leds->hw->regmap;
210 	unsigned int status;
211 	int ret;
212 
213 	ret = regmap_read(regmap, regs->top_ckpdn[2], &status);
214 	if (ret < 0)
215 		return ret;
216 
217 	if (status & RG_ISINK_CK_PDN_MASK(led->id))
218 		return 0;
219 
220 	ret = regmap_read(regmap, regs->isink_en_ctrl, &status);
221 	if (ret < 0)
222 		return ret;
223 
224 	if (!(status & ISINK_CH_EN(led->id)))
225 		return 0;
226 
227 	ret = regmap_read(regmap, ISINK_CON(regs->isink_con[2], led->id), &status);
228 	if (ret < 0)
229 		return ret;
230 
231 	return  ((status & ISINK_CH_STEP_MASK)
232 		  >> ISINK_CH_STEP_SHIFT) + 1;
233 }
234 
mt6323_led_hw_on(struct led_classdev * cdev,enum led_brightness brightness)235 static int mt6323_led_hw_on(struct led_classdev *cdev,
236 			    enum led_brightness brightness)
237 {
238 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
239 	struct mt6323_leds *leds = led->parent;
240 	const struct mt6323_regs *regs = leds->pdata->regs;
241 	struct regmap *regmap = leds->hw->regmap;
242 	unsigned int status;
243 	int ret;
244 
245 	/*
246 	 * Setup required clock source, enable the corresponding
247 	 * clock and channel and let work with continuous blink as
248 	 * the default.
249 	 */
250 	ret = regmap_update_bits(regmap, regs->top_ckcon[1],
251 				 RG_ISINK_CK_SEL_MASK(led->id), 0);
252 	if (ret < 0)
253 		return ret;
254 
255 	status = RG_ISINK_CK_PDN(led->id);
256 	ret = regmap_update_bits(regmap, regs->top_ckpdn[2],
257 				 RG_ISINK_CK_PDN_MASK(led->id),
258 				 ~status);
259 	if (ret < 0)
260 		return ret;
261 
262 	usleep_range(100, 300);
263 
264 	ret = regmap_update_bits(regmap, regs->isink_en_ctrl,
265 				 ISINK_CH_EN_MASK(led->id),
266 				 ISINK_CH_EN(led->id));
267 	if (ret < 0)
268 		return ret;
269 
270 	ret = mt6323_led_hw_brightness(cdev, brightness);
271 	if (ret < 0)
272 		return ret;
273 
274 	ret = regmap_update_bits(regmap, ISINK_CON(regs->isink_con[0], led->id),
275 				 ISINK_DIM_DUTY_MASK,
276 				 ISINK_DIM_DUTY(31));
277 	if (ret < 0)
278 		return ret;
279 
280 	ret = regmap_update_bits(regmap, ISINK_CON(regs->isink_con[1], led->id),
281 				 ISINK_DIM_FSEL_MASK,
282 				 ISINK_DIM_FSEL(1000));
283 	if (ret < 0)
284 		return ret;
285 
286 	return 0;
287 }
288 
mt6323_led_set_blink(struct led_classdev * cdev,unsigned long * delay_on,unsigned long * delay_off)289 static int mt6323_led_set_blink(struct led_classdev *cdev,
290 				unsigned long *delay_on,
291 				unsigned long *delay_off)
292 {
293 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
294 	struct mt6323_leds *leds = led->parent;
295 	const struct mt6323_regs *regs = leds->pdata->regs;
296 	const struct mt6323_hwspec *spec = leds->pdata->spec;
297 	struct regmap *regmap = leds->hw->regmap;
298 	unsigned long period;
299 	u8 duty_hw;
300 	int ret;
301 
302 	/*
303 	 * LED subsystem requires a default user
304 	 * friendly blink pattern for the LED so using
305 	 * 1Hz duty cycle 50% here if without specific
306 	 * value delay_on and delay off being assigned.
307 	 */
308 	if (!*delay_on && !*delay_off) {
309 		*delay_on = 500;
310 		*delay_off = 500;
311 	}
312 
313 	/*
314 	 * Units are in ms, if over the hardware able
315 	 * to support, fallback into software blink
316 	 */
317 	period = *delay_on + *delay_off;
318 
319 	if (period > spec->max_period)
320 		return -EINVAL;
321 
322 	/*
323 	 * Calculate duty_hw based on the percentage of period during
324 	 * which the led is ON.
325 	 */
326 	duty_hw = DIV_ROUND_CLOSEST(*delay_on * 100000ul, period * spec->unit_duty);
327 
328 	/* hardware doesn't support zero duty cycle. */
329 	if (!duty_hw)
330 		return -EINVAL;
331 
332 	mutex_lock(&leds->lock);
333 	/*
334 	 * Set max_brightness as the software blink behavior
335 	 * when no blink brightness.
336 	 */
337 	if (!led->current_brightness) {
338 		ret = mt6323_led_hw_on(cdev, cdev->max_brightness);
339 		if (ret < 0)
340 			goto out;
341 		led->current_brightness = cdev->max_brightness;
342 	}
343 
344 	ret = regmap_update_bits(regmap, ISINK_CON(regs->isink_con[0], led->id),
345 				 ISINK_DIM_DUTY_MASK,
346 				 ISINK_DIM_DUTY(duty_hw - 1));
347 	if (ret < 0)
348 		goto out;
349 
350 	ret = regmap_update_bits(regmap, ISINK_CON(regs->isink_con[1], led->id),
351 				 ISINK_DIM_FSEL_MASK,
352 				 ISINK_DIM_FSEL(period - 1));
353 out:
354 	mutex_unlock(&leds->lock);
355 
356 	return ret;
357 }
358 
mt6323_led_set_brightness(struct led_classdev * cdev,enum led_brightness brightness)359 static int mt6323_led_set_brightness(struct led_classdev *cdev,
360 				     enum led_brightness brightness)
361 {
362 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
363 	struct mt6323_leds *leds = led->parent;
364 	int ret;
365 
366 	mutex_lock(&leds->lock);
367 
368 	if (!led->current_brightness && brightness) {
369 		ret = mt6323_led_hw_on(cdev, brightness);
370 		if (ret < 0)
371 			goto out;
372 	} else if (brightness) {
373 		ret = mt6323_led_hw_brightness(cdev, brightness);
374 		if (ret < 0)
375 			goto out;
376 	} else {
377 		ret = mt6323_led_hw_off(cdev);
378 		if (ret < 0)
379 			goto out;
380 	}
381 
382 	led->current_brightness = brightness;
383 out:
384 	mutex_unlock(&leds->lock);
385 
386 	return ret;
387 }
388 
mtk_wled_hw_on(struct led_classdev * cdev)389 static int mtk_wled_hw_on(struct led_classdev *cdev)
390 {
391 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
392 	struct mt6323_leds *leds = led->parent;
393 	const struct mt6323_regs *regs = leds->pdata->regs;
394 	struct regmap *regmap = leds->hw->regmap;
395 	int ret;
396 
397 	ret = regmap_clear_bits(regmap, regs->top_ckpdn[0], RG_VWLED_32K_CK_PDN);
398 	if (ret)
399 		return ret;
400 
401 	ret = regmap_clear_bits(regmap, regs->top_ckpdn[0], RG_VWLED_6M_CK_PDN);
402 	if (ret)
403 		return ret;
404 
405 	ret = regmap_clear_bits(regmap, regs->top_ckpdn[0], RG_VWLED_1M_CK_PDN);
406 	if (ret)
407 		return ret;
408 
409 	usleep_range(5000, 6000);
410 
411 	/* Enable WLED channel pair */
412 	ret = regmap_set_bits(regmap, regs->iwled_en_ctrl, BIT(led->id));
413 	if (ret)
414 		return ret;
415 
416 	ret = regmap_set_bits(regmap, regs->iwled_en_ctrl, BIT(led->id + 1));
417 	if (ret)
418 		return ret;
419 
420 	return 0;
421 }
422 
mtk_wled_hw_off(struct led_classdev * cdev)423 static int mtk_wled_hw_off(struct led_classdev *cdev)
424 {
425 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
426 	struct mt6323_leds *leds = led->parent;
427 	const struct mt6323_regs *regs = leds->pdata->regs;
428 	struct regmap *regmap = leds->hw->regmap;
429 	int ret;
430 
431 	ret = regmap_clear_bits(regmap, regs->iwled_en_ctrl, BIT(led->id + 1));
432 	if (ret)
433 		return ret;
434 
435 	ret = regmap_clear_bits(regmap, regs->iwled_en_ctrl, BIT(led->id));
436 	if (ret)
437 		return ret;
438 
439 	ret = regmap_set_bits(regmap, regs->top_ckpdn[0], RG_VWLED_32K_CK_PDN);
440 	if (ret)
441 		return ret;
442 
443 	ret = regmap_set_bits(regmap, regs->top_ckpdn[0], RG_VWLED_6M_CK_PDN);
444 	if (ret)
445 		return ret;
446 
447 	ret = regmap_set_bits(regmap, regs->top_ckpdn[0], RG_VWLED_1M_CK_PDN);
448 	if (ret)
449 		return ret;
450 
451 	return 0;
452 }
453 
mt6323_get_wled_brightness(struct led_classdev * cdev)454 static enum led_brightness mt6323_get_wled_brightness(struct led_classdev *cdev)
455 {
456 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
457 	struct mt6323_leds *leds = led->parent;
458 	const struct mt6323_regs *regs = leds->pdata->regs;
459 	struct regmap *regmap = leds->hw->regmap;
460 	unsigned int status;
461 	int ret;
462 
463 	ret = regmap_read(regmap, regs->iwled_en_ctrl, &status);
464 	if (ret)
465 		return 0;
466 
467 	/* Always two channels per WLED */
468 	status &= BIT(led->id) | BIT(led->id + 1);
469 
470 	return status ? led->current_brightness : 0;
471 }
472 
mt6323_wled_set_brightness(struct led_classdev * cdev,enum led_brightness brightness)473 static int mt6323_wled_set_brightness(struct led_classdev *cdev,
474 				      enum led_brightness brightness)
475 {
476 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
477 	struct mt6323_leds *leds = led->parent;
478 	int ret = 0;
479 
480 	mutex_lock(&leds->lock);
481 
482 	if (brightness) {
483 		if (!led->current_brightness)
484 			ret = mtk_wled_hw_on(cdev);
485 		if (ret)
486 			goto out;
487 	} else {
488 		ret = mtk_wled_hw_off(cdev);
489 		if (ret)
490 			goto out;
491 	}
492 
493 	led->current_brightness = brightness;
494 out:
495 	mutex_unlock(&leds->lock);
496 
497 	return ret;
498 }
499 
mt6323_led_set_dt_default(struct led_classdev * cdev,struct device_node * np)500 static int mt6323_led_set_dt_default(struct led_classdev *cdev,
501 				     struct device_node *np)
502 {
503 	struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
504 	enum led_default_state state;
505 	int ret = 0;
506 
507 	state = led_init_default_state_get(of_fwnode_handle(np));
508 	switch (state) {
509 	case LEDS_DEFSTATE_ON:
510 		ret = mt6323_led_set_brightness(cdev, cdev->max_brightness);
511 		break;
512 	case LEDS_DEFSTATE_KEEP:
513 		ret = mt6323_get_led_hw_brightness(cdev);
514 		if (ret < 0)
515 			return ret;
516 		led->current_brightness = ret;
517 		ret = 0;
518 		break;
519 	default:
520 		ret = mt6323_led_set_brightness(cdev, LED_OFF);
521 	}
522 
523 	return ret;
524 }
525 
mt6323_led_probe(struct platform_device * pdev)526 static int mt6323_led_probe(struct platform_device *pdev)
527 {
528 	struct device *dev = &pdev->dev;
529 	struct device_node *np = dev_of_node(dev);
530 	struct mt6397_chip *hw = dev_get_drvdata(dev->parent);
531 	struct mt6323_leds *leds;
532 	struct mt6323_led *led;
533 	const struct mt6323_regs *regs;
534 	const struct mt6323_hwspec *spec;
535 	int ret;
536 	unsigned int status;
537 	u32 reg;
538 	u8 max_leds;
539 
540 	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
541 	if (!leds)
542 		return -ENOMEM;
543 
544 	platform_set_drvdata(pdev, leds);
545 	leds->dev = dev;
546 	leds->pdata = device_get_match_data(dev);
547 	regs = leds->pdata->regs;
548 	spec = leds->pdata->spec;
549 	max_leds = spec->max_leds + spec->max_wleds;
550 
551 	/*
552 	 * leds->hw points to the underlying bus for the register
553 	 * controlled.
554 	 */
555 	leds->hw = hw;
556 	mutex_init(&leds->lock);
557 
558 	status = RG_DRV_32K_CK_PDN;
559 	ret = regmap_update_bits(leds->hw->regmap, regs->top_ckpdn[0],
560 				 RG_DRV_32K_CK_PDN_MASK, ~status);
561 	if (ret < 0) {
562 		dev_err(leds->dev,
563 			"Failed to update TOP_CKPDN0 Register\n");
564 		return ret;
565 	}
566 
567 	for_each_available_child_of_node_scoped(np, child) {
568 		struct led_init_data init_data = {};
569 		bool is_wled;
570 
571 		ret = of_property_read_u32(child, "reg", &reg);
572 		if (ret) {
573 			dev_err(dev, "Failed to read led 'reg' property\n");
574 			return ret;
575 		}
576 
577 		if (reg >= max_leds || reg >= MAX_SUPPORTED_LEDS ||
578 		    leds->led[reg]) {
579 			dev_err(dev, "Invalid led reg %u\n", reg);
580 			return -EINVAL;
581 		}
582 
583 		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
584 		if (!led)
585 			return -ENOMEM;
586 
587 		is_wled = of_property_read_bool(child, "mediatek,is-wled");
588 
589 		leds->led[reg] = led;
590 		leds->led[reg]->id = reg;
591 		leds->led[reg]->cdev.max_brightness = spec->max_brightness;
592 
593 		if (is_wled) {
594 			leds->led[reg]->cdev.brightness_set_blocking =
595 						mt6323_wled_set_brightness;
596 			leds->led[reg]->cdev.brightness_get =
597 						mt6323_get_wled_brightness;
598 		} else {
599 			leds->led[reg]->cdev.brightness_set_blocking =
600 						mt6323_led_set_brightness;
601 			leds->led[reg]->cdev.blink_set = mt6323_led_set_blink;
602 			leds->led[reg]->cdev.brightness_get =
603 						mt6323_get_led_hw_brightness;
604 		}
605 		leds->led[reg]->parent = leds;
606 
607 		ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child);
608 		if (ret < 0) {
609 			dev_err(leds->dev,
610 				"Failed to LED set default from devicetree\n");
611 			return ret;
612 		}
613 
614 		init_data.fwnode = of_fwnode_handle(child);
615 
616 		ret = devm_led_classdev_register_ext(dev, &leds->led[reg]->cdev,
617 						     &init_data);
618 		if (ret) {
619 			dev_err(dev, "Failed to register LED: %d\n", ret);
620 			return ret;
621 		}
622 	}
623 
624 	return 0;
625 }
626 
mt6323_led_remove(struct platform_device * pdev)627 static void mt6323_led_remove(struct platform_device *pdev)
628 {
629 	struct mt6323_leds *leds = platform_get_drvdata(pdev);
630 	const struct mt6323_regs *regs = leds->pdata->regs;
631 	int i;
632 
633 	/* Turn the LEDs off on driver removal. */
634 	for (i = 0 ; leds->led[i] ; i++)
635 		mt6323_led_hw_off(&leds->led[i]->cdev);
636 
637 	regmap_update_bits(leds->hw->regmap, regs->top_ckpdn[0],
638 			   RG_DRV_32K_CK_PDN_MASK,
639 			   RG_DRV_32K_CK_PDN);
640 
641 	mutex_destroy(&leds->lock);
642 }
643 
644 static const struct mt6323_regs mt6323_registers = {
645 	.top_ckpdn = (const u16[]){ 0x102, 0x106, 0x10e },
646 	.num_top_ckpdn = 3,
647 	.top_ckcon = (const u16[]){ 0x120, 0x126 },
648 	.num_top_ckcon = 2,
649 	.isink_con = (const u16[]){ 0x330, 0x332, 0x334 },
650 	.num_isink_con = 3,
651 	.isink_max_regs = 4, /* ISINK[0..3] */
652 	.isink_en_ctrl = 0x356,
653 };
654 
655 static const struct mt6323_regs mt6331_registers = {
656 	.top_ckpdn = (const u16[]){ 0x138, 0x13e, 0x144 },
657 	.num_top_ckpdn = 3,
658 	.top_ckcon = (const u16[]){ 0x14c, 0x14a },
659 	.num_top_ckcon = 2,
660 	.isink_con = (const u16[]){ 0x40c, 0x40e, 0x410, 0x412, 0x414 },
661 	.num_isink_con = 5,
662 	.isink_max_regs = 4, /* ISINK[0..3] */
663 	.isink_en_ctrl = 0x43a,
664 };
665 
666 static const struct mt6323_regs mt6332_registers = {
667 	.top_ckpdn = (const u16[]){ 0x8094, 0x809a, 0x80a0 },
668 	.num_top_ckpdn = 3,
669 	.top_ckcon = (const u16[]){ 0x80a6, 0x80ac },
670 	.num_top_ckcon = 2,
671 	.isink_con = (const u16[]){ 0x8cd4 },
672 	.num_isink_con = 1,
673 	.isink_max_regs = 12, /* IWLED[0..2, 3..9] */
674 	.iwled_en_ctrl = 0x8cda,
675 };
676 
677 static const struct mt6323_hwspec mt6323_spec = {
678 	.max_period = 10000,
679 	.max_leds = 4,
680 	.max_brightness = 6,
681 	.unit_duty = 3125,
682 };
683 
684 static const struct mt6323_hwspec mt6332_spec = {
685 	/* There are no LEDs in MT6332. Only WLEDs are present. */
686 	.max_leds = 0,
687 	.max_wleds = 1,
688 	.max_brightness = 1024,
689 };
690 
691 static const struct mt6323_data mt6323_pdata = {
692 	.regs = &mt6323_registers,
693 	.spec = &mt6323_spec,
694 };
695 
696 static const struct mt6323_data mt6331_pdata = {
697 	.regs = &mt6331_registers,
698 	.spec = &mt6323_spec,
699 };
700 
701 static const struct mt6323_data mt6332_pdata = {
702 	.regs = &mt6332_registers,
703 	.spec = &mt6332_spec,
704 };
705 
706 static const struct of_device_id mt6323_led_dt_match[] = {
707 	{ .compatible = "mediatek,mt6323-led", .data = &mt6323_pdata},
708 	{ .compatible = "mediatek,mt6331-led", .data = &mt6331_pdata },
709 	{ .compatible = "mediatek,mt6332-led", .data = &mt6332_pdata },
710 	{},
711 };
712 MODULE_DEVICE_TABLE(of, mt6323_led_dt_match);
713 
714 static struct platform_driver mt6323_led_driver = {
715 	.probe		= mt6323_led_probe,
716 	.remove_new	= mt6323_led_remove,
717 	.driver		= {
718 		.name	= "mt6323-led",
719 		.of_match_table = mt6323_led_dt_match,
720 	},
721 };
722 
723 module_platform_driver(mt6323_led_driver);
724 
725 MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC");
726 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
727 MODULE_LICENSE("GPL");
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