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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * LED Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 */

#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_kcalloc(&pdev->dev,
			   pled->num_leds, sizeof(struct da9052_led),
			   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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
5ba73631 DDC	2	/*
	3	* LED Driver for Dialog DA9052 PMICs.
	4	*
	5	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	6	*
	7	* Author: David Dajun Chen <dchen@diasemi.com>
5ba73631 DDC	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
5ba73631 DDC	12	#include <linux/platform_device.h>
5ba73631 DDC	13	#include <linux/leds.h>
5ba73631 DDC	14	#include <linux/slab.h>
	15
	16	#include <linux/mfd/da9052/reg.h>
	17	#include <linux/mfd/da9052/da9052.h>
	18	#include <linux/mfd/da9052/pdata.h>
	19
	20	#define DA9052_OPENDRAIN_OUTPUT 2
	21	#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
	22	#define DA9052_MASK_UPPER_NIBBLE 0xF0
	23	#define DA9052_MASK_LOWER_NIBBLE 0x0F
	24	#define DA9052_NIBBLE_SHIFT 4
	25	#define DA9052_MAX_BRIGHTNESS 0x5f
	26
	27	struct da9052_led {
	28	struct led_classdev cdev;
5ba73631 DDC	29	struct da9052 *da9052;
	30	unsigned char led_index;
	31	unsigned char id;
5ba73631 DDC	32	};
	33
	34	static unsigned char led_reg[] = {
	35	DA9052_LED_CONT_4_REG,
	36	DA9052_LED_CONT_5_REG,
	37	};
	38
0a1f01d3 AL	39	static int da9052_set_led_brightness(struct da9052_led *led,
0a1f01d3 AL	40	enum led_brightness brightness)
5ba73631 DDC	41	{
	42	u8 val;
	43	int error;
	44
0a1f01d3	45	val = (brightness & 0x7f) \| DA9052_LED_CONT_DIM;
5ba73631 DDC	46
	47	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
	48	if (error < 0)
	49	dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
	50	error);
	51	return error;
	52	}
	53
0a1f01d3	54	static int da9052_led_set(struct led_classdev *led_cdev,
5ba73631 DDC	55	enum led_brightness value)
5ba73631 DDC	56	{
0a1f01d3 AL	57	struct da9052_led *led =
0a1f01d3 AL	58	container_of(led_cdev, struct da9052_led, cdev);
5ba73631	59
0a1f01d3	60	return da9052_set_led_brightness(led, value);
5ba73631 DDC	61	}
	62
	63	static int da9052_configure_leds(struct da9052 *da9052)
	64	{
	65	int error;
	66	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
	67	\| DA9052_SET_HIGH_LVL_OUTPUT;
	68
	69	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
	70	DA9052_MASK_LOWER_NIBBLE,
	71	register_value);
	72
	73	if (error < 0) {
	74	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
	75	error);
	76	return error;
	77	}
	78
	79	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
	80	DA9052_MASK_UPPER_NIBBLE,
	81	register_value << DA9052_NIBBLE_SHIFT);
	82	if (error < 0)
	83	dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
	84	error);
	85
	86	return error;
	87	}
	88
98ea1ea2	89	static int da9052_led_probe(struct platform_device *pdev)
5ba73631 DDC	90	{
	91	struct da9052_pdata *pdata;
	92	struct da9052 *da9052;
	93	struct led_platform_data *pled;
	94	struct da9052_led *led = NULL;
	95	int error = -ENODEV;
	96	int i;
	97
	98	da9052 = dev_get_drvdata(pdev->dev.parent);
87aae1ea	99	pdata = dev_get_platdata(da9052->dev);
5ba73631 DDC	100	if (pdata == NULL) {
	101	dev_err(&pdev->dev, "No platform data\n");
	102	goto err;
	103	}
	104
	105	pled = pdata->pled;
	106	if (pled == NULL) {
	107	dev_err(&pdev->dev, "No platform data for LED\n");
	108	goto err;
	109	}
	110
a86854d0 KC	111	led = devm_kcalloc(&pdev->dev,
a86854d0 KC	112	pled->num_leds, sizeof(struct da9052_led),
5ba73631	113	GFP_KERNEL);
0c9a03b6	114	if (!led) {
5ba73631 DDC	115	error = -ENOMEM;
	116	goto err;
	117	}
	118
	119	for (i = 0; i < pled->num_leds; i++) {
	120	led[i].cdev.name = pled->leds[i].name;
0a1f01d3	121	led[i].cdev.brightness_set_blocking = da9052_led_set;
5ba73631 DDC	122	led[i].cdev.brightness = LED_OFF;
5ba73631 DDC	123	led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
5ba73631 DDC	124	led[i].led_index = pled->leds[i].flags;
5ba73631 DDC	125	led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
5ba73631 DDC	126
	127	error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
	128	if (error) {
	129	dev_err(&pdev->dev, "Failed to register led %d\n",
	130	led[i].led_index);
	131	goto err_register;
	132	}
	133
0a1f01d3 AL	134	error = da9052_set_led_brightness(&led[i],
0a1f01d3 AL	135	led[i].cdev.brightness);
5ba73631 DDC	136	if (error) {
	137	dev_err(&pdev->dev, "Unable to init led %d\n",
	138	led[i].led_index);
	139	continue;
	140	}
	141	}
	142	error = da9052_configure_leds(led->da9052);
	143	if (error) {
	144	dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
	145	goto err_register;
	146	}
	147
	148	platform_set_drvdata(pdev, led);
	149
	150	return 0;
	151
	152	err_register:
0a1f01d3	153	for (i = i - 1; i >= 0; i--)
5ba73631	154	led_classdev_unregister(&led[i].cdev);
5ba73631 DDC	155	err:
	156	return error;
	157	}
	158
678e8a6b	159	static int da9052_led_remove(struct platform_device *pdev)
5ba73631 DDC	160	{
	161	struct da9052_led *led = platform_get_drvdata(pdev);
	162	struct da9052_pdata *pdata;
	163	struct da9052 *da9052;
	164	struct led_platform_data *pled;
	165	int i;
	166
	167	da9052 = dev_get_drvdata(pdev->dev.parent);
87aae1ea	168	pdata = dev_get_platdata(da9052->dev);
5ba73631 DDC	169	pled = pdata->pled;
	170
	171	for (i = 0; i < pled->num_leds; i++) {
0a1f01d3	172	da9052_set_led_brightness(&led[i], LED_OFF);
5ba73631	173	led_classdev_unregister(&led[i].cdev);
5ba73631 DDC	174	}
	175
	176	return 0;
	177	}
	178
	179	static struct platform_driver da9052_led_driver = {
	180	.driver = {
	181	.name = "da9052-leds",
5ba73631 DDC	182	},
5ba73631 DDC	183	.probe = da9052_led_probe,
df07cf81	184	.remove = da9052_led_remove,
5ba73631 DDC	185	};
	186
	187	module_platform_driver(da9052_led_driver);
	188
	189	MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
	190	MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
	191	MODULE_LICENSE("GPL");