[linux.git] / drivers / leds / leds-da9052.c

/*
 * LED Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <[email protected]>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/slab.h>

#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/pdata.h>

#define DA9052_OPENDRAIN_OUTPUT	2
#define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)
#define DA9052_MASK_UPPER_NIBBLE	0xF0
#define DA9052_MASK_LOWER_NIBBLE	0x0F
#define DA9052_NIBBLE_SHIFT		4
#define DA9052_MAX_BRIGHTNESS		0x5f

struct da9052_led {
	struct led_classdev cdev;
	struct work_struct work;
	struct da9052 *da9052;
	unsigned char led_index;
	unsigned char id;
	int brightness;
};

static unsigned char led_reg[] = {
	DA9052_LED_CONT_4_REG,
	DA9052_LED_CONT_5_REG,
};

static int da9052_set_led_brightness(struct da9052_led *led)
{
	u8 val;
	int error;

	val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;

	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
	if (error < 0)
		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
			error);
	return error;
}

static void da9052_led_work(struct work_struct *work)
{
	struct da9052_led *led = container_of(work, struct da9052_led, work);

	da9052_set_led_brightness(led);
}

static void da9052_led_set(struct led_classdev *led_cdev,
			   enum led_brightness value)
{
	struct da9052_led *led;

	led = container_of(led_cdev, struct da9052_led, cdev);
	led->brightness = value;
	schedule_work(&led->work);
}

static int da9052_configure_leds(struct da9052 *da9052)
{
	int error;
	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
				       | DA9052_SET_HIGH_LVL_OUTPUT;

	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
				  DA9052_MASK_LOWER_NIBBLE,
				  register_value);

	if (error < 0) {
		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
			error);
		return error;
	}

	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
				  DA9052_MASK_UPPER_NIBBLE,
				  register_value << DA9052_NIBBLE_SHIFT);
	if (error < 0)
		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
			error);

	return error;
}

static int da9052_led_probe(struct platform_device *pdev)
{
	struct da9052_pdata *pdata;
	struct da9052 *da9052;
	struct led_platform_data *pled;
	struct da9052_led *led = NULL;
	int error = -ENODEV;
	int i;

	da9052 = dev_get_drvdata(pdev->dev.parent);
	pdata = da9052->dev->platform_data;
	if (pdata == NULL) {
		dev_err(&pdev->dev, "No platform data\n");
		goto err;
	}

	pled = pdata->pled;
	if (pled == NULL) {
		dev_err(&pdev->dev, "No platform data for LED\n");
		goto err;
	}

	led = devm_kzalloc(&pdev->dev,
			   sizeof(struct da9052_led) * pled->num_leds,
			   GFP_KERNEL);
	if (led == NULL) {
		dev_err(&pdev->dev, "Failed to alloc memory\n");
		error = -ENOMEM;
		goto err;
	}

	for (i = 0; i < pled->num_leds; i++) {
		led[i].cdev.name = pled->leds[i].name;
		led[i].cdev.brightness_set = da9052_led_set;
		led[i].cdev.brightness = LED_OFF;
		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
		led[i].brightness = LED_OFF;
		led[i].led_index = pled->leds[i].flags;
		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
		INIT_WORK(&led[i].work, da9052_led_work);

		error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
		if (error) {
			dev_err(&pdev->dev, "Failed to register led %d\n",
				led[i].led_index);
			goto err_register;
		}

		error = da9052_set_led_brightness(&led[i]);
		if (error) {
			dev_err(&pdev->dev, "Unable to init led %d\n",
				led[i].led_index);
			continue;
		}
	}
	error = da9052_configure_leds(led->da9052);
	if (error) {
		dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
		goto err_register;
	}

	platform_set_drvdata(pdev, led);

	return 0;

err_register:
	for (i = i - 1; i >= 0; i--) {
		led_classdev_unregister(&led[i].cdev);
		cancel_work_sync(&led[i].work);
	}
err:
	return error;
}

static int da9052_led_remove(struct platform_device *pdev)
{
	struct da9052_led *led = platform_get_drvdata(pdev);
	struct da9052_pdata *pdata;
	struct da9052 *da9052;
	struct led_platform_data *pled;
	int i;

	da9052 = dev_get_drvdata(pdev->dev.parent);
	pdata = da9052->dev->platform_data;
	pled = pdata->pled;

	for (i = 0; i < pled->num_leds; i++) {
		led[i].brightness = 0;
		da9052_set_led_brightness(&led[i]);
		led_classdev_unregister(&led[i].cdev);
		cancel_work_sync(&led[i].work);
	}

	return 0;
}

static struct platform_driver da9052_led_driver = {
	.driver		= {
		.name	= "da9052-leds",
		.owner	= THIS_MODULE,
	},
	.probe		= da9052_led_probe,
	.remove		= da9052_led_remove,
};

module_platform_driver(da9052_led_driver);

MODULE_AUTHOR("Dialog Semiconductor Ltd <[email protected]>");
MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
Commit	Line	Data
5ba73631 DDC	1	/*
	2	* LED Driver for Dialog DA9052 PMICs.
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/leds.h>
	20	#include <linux/workqueue.h>
	21	#include <linux/slab.h>
	22
	23	#include <linux/mfd/da9052/reg.h>
	24	#include <linux/mfd/da9052/da9052.h>
	25	#include <linux/mfd/da9052/pdata.h>
	26
	27	#define DA9052_OPENDRAIN_OUTPUT 2
	28	#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
	29	#define DA9052_MASK_UPPER_NIBBLE 0xF0
	30	#define DA9052_MASK_LOWER_NIBBLE 0x0F
	31	#define DA9052_NIBBLE_SHIFT 4
	32	#define DA9052_MAX_BRIGHTNESS 0x5f
	33
	34	struct da9052_led {
	35	struct led_classdev cdev;
	36	struct work_struct work;
	37	struct da9052 *da9052;
	38	unsigned char led_index;
	39	unsigned char id;
	40	int brightness;
	41	};
	42
	43	static unsigned char led_reg[] = {
	44	DA9052_LED_CONT_4_REG,
	45	DA9052_LED_CONT_5_REG,
	46	};
	47
	48	static int da9052_set_led_brightness(struct da9052_led *led)
	49	{
	50	u8 val;
	51	int error;
	52
	53	val = (led->brightness & 0x7f) \| DA9052_LED_CONT_DIM;
	54
	55	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
	56	if (error < 0)
	57	dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
	58	error);
	59	return error;
	60	}
	61
	62	static void da9052_led_work(struct work_struct *work)
	63	{
	64	struct da9052_led *led = container_of(work, struct da9052_led, work);
65
66	da9052_set_led_brightness(led);
67	}
68
69	static void da9052_led_set(struct led_classdev *led_cdev,
70	enum led_brightness value)
71	{
72	struct da9052_led *led;
73
74	led = container_of(led_cdev, struct da9052_led, cdev);
75	led->brightness = value;
76	schedule_work(&led->work);
77	}
78
79	static int da9052_configure_leds(struct da9052 *da9052)
80	{
81	int error;
82	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
83	\| DA9052_SET_HIGH_LVL_OUTPUT;
84
85	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
86	DA9052_MASK_LOWER_NIBBLE,
87	register_value);
88
89	if (error < 0) {
90	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
91	error);
92	return error;
93	}
94
95	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
96	DA9052_MASK_UPPER_NIBBLE,
97	register_value << DA9052_NIBBLE_SHIFT);
98	if (error < 0)
99	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
100	error);
101
102	return error;
103	}
104
98ea1ea2	105	static int da9052_led_probe(struct platform_device *pdev)
5ba73631 DDC	106	{
	107	struct da9052_pdata *pdata;
	108	struct da9052 *da9052;
	109	struct led_platform_data *pled;
	110	struct da9052_led *led = NULL;
	111	int error = -ENODEV;
	112	int i;
	113
	114	da9052 = dev_get_drvdata(pdev->dev.parent);
	115	pdata = da9052->dev->platform_data;
	116	if (pdata == NULL) {
	117	dev_err(&pdev->dev, "No platform data\n");
	118	goto err;
	119	}
	120
	121	pled = pdata->pled;
	122	if (pled == NULL) {
	123	dev_err(&pdev->dev, "No platform data for LED\n");
	124	goto err;
	125	}
	126
	127	led = devm_kzalloc(&pdev->dev,
	128	sizeof(struct da9052_led) * pled->num_leds,
	129	GFP_KERNEL);
	130	if (led == NULL) {
	131	dev_err(&pdev->dev, "Failed to alloc memory\n");
	132	error = -ENOMEM;
	133	goto err;
	134	}
	135
	136	for (i = 0; i < pled->num_leds; i++) {
	137	led[i].cdev.name = pled->leds[i].name;
	138	led[i].cdev.brightness_set = da9052_led_set;
	139	led[i].cdev.brightness = LED_OFF;
	140	led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
	141	led[i].brightness = LED_OFF;
	142	led[i].led_index = pled->leds[i].flags;
	143	led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
	144	INIT_WORK(&led[i].work, da9052_led_work);
	145
	146	error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
	147	if (error) {
	148	dev_err(&pdev->dev, "Failed to register led %d\n",
	149	led[i].led_index);
	150	goto err_register;
	151	}
	152
	153	error = da9052_set_led_brightness(&led[i]);
	154	if (error) {
	155	dev_err(&pdev->dev, "Unable to init led %d\n",
	156	led[i].led_index);
	157	continue;
	158	}
	159	}
	160	error = da9052_configure_leds(led->da9052);
	161	if (error) {
	162	dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
	163	goto err_register;
	164	}
	165
	166	platform_set_drvdata(pdev, led);
	167
	168	return 0;
	169
170	err_register:
171	for (i = i - 1; i >= 0; i--) {
172	led_classdev_unregister(&led[i].cdev);
173	cancel_work_sync(&led[i].work);
174	}
175	err:
176	return error;
177	}
178
678e8a6b	179	static int da9052_led_remove(struct platform_device *pdev)
5ba73631 DDC	180	{
	181	struct da9052_led *led = platform_get_drvdata(pdev);
	182	struct da9052_pdata *pdata;
	183	struct da9052 *da9052;
	184	struct led_platform_data *pled;
	185	int i;
	186
	187	da9052 = dev_get_drvdata(pdev->dev.parent);
	188	pdata = da9052->dev->platform_data;
	189	pled = pdata->pled;
	190
	191	for (i = 0; i < pled->num_leds; i++) {
	192	led[i].brightness = 0;
	193	da9052_set_led_brightness(&led[i]);
	194	led_classdev_unregister(&led[i].cdev);
	195	cancel_work_sync(&led[i].work);
	196	}
	197
	198	return 0;
	199	}
	200
	201	static struct platform_driver da9052_led_driver = {
	202	.driver = {
	203	.name = "da9052-leds",
	204	.owner = THIS_MODULE,
	205	},
	206	.probe = da9052_led_probe,
df07cf81	207	.remove = da9052_led_remove,
5ba73631 DDC	208	};
	209
	210	module_platform_driver(da9052_led_driver);
	211
	212	MODULE_AUTHOR("Dialog Semiconductor Ltd <[email protected]>");
	213	MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
	214	MODULE_LICENSE("GPL");