[deliverable/linux.git] / drivers / gpio / gpio-arizona.c

/*
 * gpiolib support for Wolfson Arizona class devices
 *
 * Copyright 2012 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>

#include <linux/mfd/arizona/core.h>
#include <linux/mfd/arizona/pdata.h>
#include <linux/mfd/arizona/registers.h>

struct arizona_gpio {
	struct arizona *arizona;
	struct gpio_chip gpio_chip;
};

static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct arizona_gpio, gpio_chip);
}

static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	struct arizona *arizona = arizona_gpio->arizona;

	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
				  ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
}

static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	struct arizona *arizona = arizona_gpio->arizona;
	unsigned int val;
	int ret;

	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	if (ret < 0)
		return ret;

	if (val & ARIZONA_GPN_LVL)
		return 1;
	else
		return 0;
}

static int arizona_gpio_direction_out(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	struct arizona *arizona = arizona_gpio->arizona;

	if (value)
		value = ARIZONA_GPN_LVL;

	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
				  ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
}

static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	struct arizona *arizona = arizona_gpio->arizona;

	if (value)
		value = ARIZONA_GPN_LVL;

	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
			   ARIZONA_GPN_LVL, value);
}

static struct gpio_chip template_chip = {
	.label			= "arizona",
	.owner			= THIS_MODULE,
	.direction_input	= arizona_gpio_direction_in,
	.get			= arizona_gpio_get,
	.direction_output	= arizona_gpio_direction_out,
	.set			= arizona_gpio_set,
	.can_sleep		= true,
};

static int arizona_gpio_probe(struct platform_device *pdev)
{
	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
	struct arizona_gpio *arizona_gpio;
	int ret;

	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
				    GFP_KERNEL);
	if (arizona_gpio == NULL)
		return -ENOMEM;

	arizona_gpio->arizona = arizona;
	arizona_gpio->gpio_chip = template_chip;
	arizona_gpio->gpio_chip.dev = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
#endif

	switch (arizona->type) {
	case WM5102:
	case WM5110:
	case WM8997:
		arizona_gpio->gpio_chip.ngpio = 5;
		break;
	default:
		dev_err(&pdev->dev, "Unknown chip variant %d\n",
			arizona->type);
		return -EINVAL;
	}

	if (pdata && pdata->gpio_base)
		arizona_gpio->gpio_chip.base = pdata->gpio_base;
	else
		arizona_gpio->gpio_chip.base = -1;

	ret = gpiochip_add(&arizona_gpio->gpio_chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
			ret);
		goto err;
	}

	platform_set_drvdata(pdev, arizona_gpio);

	return ret;

err:
	return ret;
}

static int arizona_gpio_remove(struct platform_device *pdev)
{
	struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);

	return gpiochip_remove(&arizona_gpio->gpio_chip);
}

static struct platform_driver arizona_gpio_driver = {
	.driver.name	= "arizona-gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= arizona_gpio_probe,
	.remove		= arizona_gpio_remove,
};

module_platform_driver(arizona_gpio_driver);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for Arizona devices");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:arizona-gpio");
Commit	Line	Data
31ba56f2 MB	1	/*
	2	* gpiolib support for Wolfson Arizona class devices
	3	*
	4	* Copyright 2012 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.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/kernel.h>
	16	#include <linux/slab.h>
	17	#include <linux/module.h>
	18	#include <linux/gpio.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/seq_file.h>
	21
	22	#include <linux/mfd/arizona/core.h>
	23	#include <linux/mfd/arizona/pdata.h>
	24	#include <linux/mfd/arizona/registers.h>
	25
	26	struct arizona_gpio {
	27	struct arizona *arizona;
	28	struct gpio_chip gpio_chip;
	29	};
	30
	31	static inline struct arizona_gpio to_arizona_gpio(struct gpio_chip chip)
	32	{
	33	return container_of(chip, struct arizona_gpio, gpio_chip);
	34	}
	35
	36	static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	37	{
	38	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	39	struct arizona *arizona = arizona_gpio->arizona;
	40
	41	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	42	ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
	43	}
	44
	45	static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
	46	{
	47	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
	48	struct arizona *arizona = arizona_gpio->arizona;
	49	unsigned int val;
	50	int ret;
	51
	52	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	53	if (ret < 0)
	54	return ret;
	55
	56	if (val & ARIZONA_GPN_LVL)
	57	return 1;
	58	else
	59	return 0;
	60	}
	61
	62	static int arizona_gpio_direction_out(struct gpio_chip *chip,
	63	unsigned offset, int value)
	64	{
65	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
66	struct arizona *arizona = arizona_gpio->arizona;
67
68	if (value)
69	value = ARIZONA_GPN_LVL;
70
71	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
72	ARIZONA_GPN_DIR \| ARIZONA_GPN_LVL, value);
73	}
74
75	static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
76	{
77	struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
78	struct arizona *arizona = arizona_gpio->arizona;
79
80	if (value)
81	value = ARIZONA_GPN_LVL;
82
83	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
84	ARIZONA_GPN_LVL, value);
85	}
86
87	static struct gpio_chip template_chip = {
88	.label = "arizona",
89	.owner = THIS_MODULE,
90	.direction_input = arizona_gpio_direction_in,
91	.get = arizona_gpio_get,
92	.direction_output = arizona_gpio_direction_out,
93	.set = arizona_gpio_set,
9fb1f39e	94	.can_sleep = true,
31ba56f2 MB	95	};
31ba56f2 MB	96
3836309d	97	static int arizona_gpio_probe(struct platform_device *pdev)
31ba56f2 MB	98	{
31ba56f2 MB	99	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
e56aee18	100	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
31ba56f2 MB	101	struct arizona_gpio *arizona_gpio;
	102	int ret;
	103
	104	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
	105	GFP_KERNEL);
	106	if (arizona_gpio == NULL)
	107	return -ENOMEM;
	108
	109	arizona_gpio->arizona = arizona;
	110	arizona_gpio->gpio_chip = template_chip;
	111	arizona_gpio->gpio_chip.dev = &pdev->dev;
4bbd6f2e CK	112	#ifdef CONFIG_OF_GPIO
	113	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
	114	#endif
31ba56f2 MB	115
	116	switch (arizona->type) {
	117	case WM5102:
	118	case WM5110:
d9cadcc9	119	case WM8997:
31ba56f2 MB	120	arizona_gpio->gpio_chip.ngpio = 5;
	121	break;
	122	default:
	123	dev_err(&pdev->dev, "Unknown chip variant %d\n",
	124	arizona->type);
	125	return -EINVAL;
	126	}
	127
	128	if (pdata && pdata->gpio_base)
	129	arizona_gpio->gpio_chip.base = pdata->gpio_base;
	130	else
	131	arizona_gpio->gpio_chip.base = -1;
	132
	133	ret = gpiochip_add(&arizona_gpio->gpio_chip);
	134	if (ret < 0) {
	135	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	136	ret);
	137	goto err;
	138	}
	139
	140	platform_set_drvdata(pdev, arizona_gpio);
	141
	142	return ret;
	143
	144	err:
	145	return ret;
	146	}
	147
206210ce	148	static int arizona_gpio_remove(struct platform_device *pdev)
31ba56f2 MB	149	{
	150	struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
	151
	152	return gpiochip_remove(&arizona_gpio->gpio_chip);
	153	}
	154
	155	static struct platform_driver arizona_gpio_driver = {
	156	.driver.name = "arizona-gpio",
	157	.driver.owner = THIS_MODULE,
	158	.probe = arizona_gpio_probe,
8283c4ff	159	.remove = arizona_gpio_remove,
31ba56f2 MB	160	};
	161
	162	module_platform_driver(arizona_gpio_driver);
	163
	164	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	165	MODULE_DESCRIPTION("GPIO interface for Arizona devices");
	166	MODULE_LICENSE("GPL");
	167	MODULE_ALIAS("platform:arizona-gpio");