[linux-2.6-block.git] / drivers / leds / leds-da9052.c

/*
 * LED Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 *
 *  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/platform_device.h>
#include <linux/leds.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 da9052 *da9052;
	unsigned char led_index;
	unsigned char id;
};

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,
				     enum led_brightness brightness)
{
	u8 val;
	int error;

	val = (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 int da9052_led_set(struct led_classdev *led_cdev,
			   enum led_brightness value)
{
	struct da9052_led *led =
			container_of(led_cdev, struct da9052_led, cdev);

	return da9052_set_led_brightness(led, value);
}

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 = dev_get_platdata(da9052->dev);
	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) {
		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_blocking = da9052_led_set;
		led[i].cdev.brightness = LED_OFF;
		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
		led[i].led_index = pled->leds[i].flags;
		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);

		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],
						  led[i].cdev.brightness);
		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);
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 = dev_get_platdata(da9052->dev);
	pled = pdata->pled;

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

	return 0;
}

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

module_platform_driver(da9052_led_driver);

MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
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 <dchen@diasemi.com>
	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>
5ba73631 DDC	17	#include <linux/platform_device.h>
5ba73631 DDC	18	#include <linux/leds.h>
5ba73631 DDC	19	#include <linux/slab.h>
	20
	21	#include <linux/mfd/da9052/reg.h>
	22	#include <linux/mfd/da9052/da9052.h>
	23	#include <linux/mfd/da9052/pdata.h>
	24
	25	#define DA9052_OPENDRAIN_OUTPUT 2
	26	#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
	27	#define DA9052_MASK_UPPER_NIBBLE 0xF0
	28	#define DA9052_MASK_LOWER_NIBBLE 0x0F
	29	#define DA9052_NIBBLE_SHIFT 4
	30	#define DA9052_MAX_BRIGHTNESS 0x5f
	31
	32	struct da9052_led {
	33	struct led_classdev cdev;
5ba73631 DDC	34	struct da9052 *da9052;
	35	unsigned char led_index;
	36	unsigned char id;
5ba73631 DDC	37	};
	38
	39	static unsigned char led_reg[] = {
	40	DA9052_LED_CONT_4_REG,
	41	DA9052_LED_CONT_5_REG,
	42	};
	43
0a1f01d3 AL	44	static int da9052_set_led_brightness(struct da9052_led *led,
0a1f01d3 AL	45	enum led_brightness brightness)
5ba73631 DDC	46	{
	47	u8 val;
	48	int error;
	49
0a1f01d3	50	val = (brightness & 0x7f) \| DA9052_LED_CONT_DIM;
5ba73631 DDC	51
	52	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
	53	if (error < 0)
	54	dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
	55	error);
	56	return error;
	57	}
	58
0a1f01d3	59	static int da9052_led_set(struct led_classdev *led_cdev,
5ba73631 DDC	60	enum led_brightness value)
5ba73631 DDC	61	{
0a1f01d3 AL	62	struct da9052_led *led =
0a1f01d3 AL	63	container_of(led_cdev, struct da9052_led, cdev);
5ba73631	64
0a1f01d3	65	return da9052_set_led_brightness(led, value);
5ba73631 DDC	66	}
	67
	68	static int da9052_configure_leds(struct da9052 *da9052)
	69	{
	70	int error;
	71	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
	72	\| DA9052_SET_HIGH_LVL_OUTPUT;
	73
	74	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
	75	DA9052_MASK_LOWER_NIBBLE,
	76	register_value);
	77
	78	if (error < 0) {
	79	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
	80	error);
	81	return error;
	82	}
	83
	84	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
	85	DA9052_MASK_UPPER_NIBBLE,
	86	register_value << DA9052_NIBBLE_SHIFT);
	87	if (error < 0)
	88	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
	89	error);
	90
	91	return error;
	92	}
	93
98ea1ea2	94	static int da9052_led_probe(struct platform_device *pdev)
5ba73631 DDC	95	{
	96	struct da9052_pdata *pdata;
	97	struct da9052 *da9052;
	98	struct led_platform_data *pled;
	99	struct da9052_led *led = NULL;
	100	int error = -ENODEV;
	101	int i;
	102
	103	da9052 = dev_get_drvdata(pdev->dev.parent);
87aae1ea	104	pdata = dev_get_platdata(da9052->dev);
5ba73631 DDC	105	if (pdata == NULL) {
	106	dev_err(&pdev->dev, "No platform data\n");
	107	goto err;
	108	}
	109
	110	pled = pdata->pled;
	111	if (pled == NULL) {
	112	dev_err(&pdev->dev, "No platform data for LED\n");
	113	goto err;
	114	}
	115
	116	led = devm_kzalloc(&pdev->dev,
	117	sizeof(struct da9052_led) * pled->num_leds,
	118	GFP_KERNEL);
0c9a03b6	119	if (!led) {
5ba73631 DDC	120	error = -ENOMEM;
	121	goto err;
	122	}
	123
	124	for (i = 0; i < pled->num_leds; i++) {
	125	led[i].cdev.name = pled->leds[i].name;
0a1f01d3	126	led[i].cdev.brightness_set_blocking = da9052_led_set;
5ba73631 DDC	127	led[i].cdev.brightness = LED_OFF;
5ba73631 DDC	128	led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
5ba73631 DDC	129	led[i].led_index = pled->leds[i].flags;
5ba73631 DDC	130	led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
5ba73631 DDC	131
	132	error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
	133	if (error) {
	134	dev_err(&pdev->dev, "Failed to register led %d\n",
	135	led[i].led_index);
	136	goto err_register;
	137	}
	138
0a1f01d3 AL	139	error = da9052_set_led_brightness(&led[i],
0a1f01d3 AL	140	led[i].cdev.brightness);
5ba73631 DDC	141	if (error) {
	142	dev_err(&pdev->dev, "Unable to init led %d\n",
	143	led[i].led_index);
	144	continue;
	145	}
	146	}
	147	error = da9052_configure_leds(led->da9052);
	148	if (error) {
	149	dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
	150	goto err_register;
	151	}
	152
	153	platform_set_drvdata(pdev, led);
	154
	155	return 0;
	156
	157	err_register:
0a1f01d3	158	for (i = i - 1; i >= 0; i--)
5ba73631	159	led_classdev_unregister(&led[i].cdev);
5ba73631 DDC	160	err:
	161	return error;
	162	}
	163
678e8a6b	164	static int da9052_led_remove(struct platform_device *pdev)
5ba73631 DDC	165	{
	166	struct da9052_led *led = platform_get_drvdata(pdev);
	167	struct da9052_pdata *pdata;
	168	struct da9052 *da9052;
	169	struct led_platform_data *pled;
	170	int i;
	171
	172	da9052 = dev_get_drvdata(pdev->dev.parent);
87aae1ea	173	pdata = dev_get_platdata(da9052->dev);
5ba73631 DDC	174	pled = pdata->pled;
	175
	176	for (i = 0; i < pled->num_leds; i++) {
0a1f01d3	177	da9052_set_led_brightness(&led[i], LED_OFF);
5ba73631	178	led_classdev_unregister(&led[i].cdev);
5ba73631 DDC	179	}
	180
	181	return 0;
	182	}
	183
	184	static struct platform_driver da9052_led_driver = {
	185	.driver = {
	186	.name = "da9052-leds",
5ba73631 DDC	187	},
5ba73631 DDC	188	.probe = da9052_led_probe,
df07cf81	189	.remove = da9052_led_remove,
5ba73631 DDC	190	};
	191
	192	module_platform_driver(da9052_led_driver);
	193
	194	MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
	195	MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
	196	MODULE_LICENSE("GPL");