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

/*
 * gpiolib support for Wolfson Arizona class devices
 *
 * Copyright 2012 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <[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/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 int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct arizona_gpio *arizona_gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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)
		return -ENOMEM;

	arizona_gpio->arizona = arizona;
	arizona_gpio->gpio_chip = template_chip;
	arizona_gpio->gpio_chip.parent = &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 WM8280:
	case WM8997:
	case WM8998:
	case WM1814:
		arizona_gpio->gpio_chip.ngpio = 5;
		break;
	case WM1831:
	case CS47L24:
		arizona_gpio->gpio_chip.ngpio = 2;
		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 = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
				     arizona_gpio);
	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 struct platform_driver arizona_gpio_driver = {
	.driver.name	= "arizona-gpio",
	.probe		= arizona_gpio_probe,
};

module_platform_driver(arizona_gpio_driver);

MODULE_AUTHOR("Mark Brown <[email protected]>");
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 <[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/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
31ba56f2 MB	31	static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
31ba56f2 MB	32	{
18992d4e	33	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	34	struct arizona *arizona = arizona_gpio->arizona;
	35
	36	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	37	ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
	38	}
	39
	40	static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
	41	{
18992d4e	42	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	43	struct arizona *arizona = arizona_gpio->arizona;
	44	unsigned int val;
	45	int ret;
	46
	47	ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
	48	if (ret < 0)
	49	return ret;
	50
	51	if (val & ARIZONA_GPN_LVL)
	52	return 1;
	53	else
	54	return 0;
	55	}
	56
	57	static int arizona_gpio_direction_out(struct gpio_chip *chip,
	58	unsigned offset, int value)
	59	{
18992d4e	60	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	61	struct arizona *arizona = arizona_gpio->arizona;
	62
	63	if (value)
	64	value = ARIZONA_GPN_LVL;
	65
	66	return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	67	ARIZONA_GPN_DIR \| ARIZONA_GPN_LVL, value);
	68	}
	69
	70	static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	71	{
18992d4e	72	struct arizona_gpio *arizona_gpio = gpiochip_get_data(chip);
31ba56f2 MB	73	struct arizona *arizona = arizona_gpio->arizona;
	74
	75	if (value)
	76	value = ARIZONA_GPN_LVL;
	77
	78	regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
	79	ARIZONA_GPN_LVL, value);
	80	}
	81
	82	static struct gpio_chip template_chip = {
	83	.label = "arizona",
	84	.owner = THIS_MODULE,
	85	.direction_input = arizona_gpio_direction_in,
	86	.get = arizona_gpio_get,
	87	.direction_output = arizona_gpio_direction_out,
	88	.set = arizona_gpio_set,
9fb1f39e	89	.can_sleep = true,
31ba56f2 MB	90	};
31ba56f2 MB	91
3836309d	92	static int arizona_gpio_probe(struct platform_device *pdev)
31ba56f2 MB	93	{
31ba56f2 MB	94	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
e56aee18	95	struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
31ba56f2 MB	96	struct arizona_gpio *arizona_gpio;
	97	int ret;
	98
	99	arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
	100	GFP_KERNEL);
afeb7b45	101	if (!arizona_gpio)
31ba56f2 MB	102	return -ENOMEM;
	103
	104	arizona_gpio->arizona = arizona;
	105	arizona_gpio->gpio_chip = template_chip;
58383c78	106	arizona_gpio->gpio_chip.parent = &pdev->dev;
4bbd6f2e CK	107	#ifdef CONFIG_OF_GPIO
	108	arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
	109	#endif
31ba56f2 MB	110
	111	switch (arizona->type) {
	112	case WM5102:
	113	case WM5110:
449c175e	114	case WM8280:
d9cadcc9	115	case WM8997:
633a5065 RF	116	case WM8998:
633a5065 RF	117	case WM1814:
31ba56f2 MB	118	arizona_gpio->gpio_chip.ngpio = 5;
31ba56f2 MB	119	break;
7d07d15a RF	120	case WM1831:
	121	case CS47L24:
	122	arizona_gpio->gpio_chip.ngpio = 2;
	123	break;
31ba56f2 MB	124	default:
	125	dev_err(&pdev->dev, "Unknown chip variant %d\n",
	126	arizona->type);
	127	return -EINVAL;
	128	}
	129
	130	if (pdata && pdata->gpio_base)
	131	arizona_gpio->gpio_chip.base = pdata->gpio_base;
	132	else
	133	arizona_gpio->gpio_chip.base = -1;
	134
db303a90 LD	135	ret = devm_gpiochip_add_data(&pdev->dev, &arizona_gpio->gpio_chip,
db303a90 LD	136	arizona_gpio);
31ba56f2 MB	137	if (ret < 0) {
	138	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	139	ret);
	140	goto err;
	141	}
	142
	143	platform_set_drvdata(pdev, arizona_gpio);
	144
	145	return ret;
	146
	147	err:
	148	return ret;
	149	}
	150
31ba56f2 MB	151	static struct platform_driver arizona_gpio_driver = {
31ba56f2 MB	152	.driver.name = "arizona-gpio",
31ba56f2	153	.probe = arizona_gpio_probe,
31ba56f2 MB	154	};
	155
	156	module_platform_driver(arizona_gpio_driver);
	157
	158	MODULE_AUTHOR("Mark Brown <[email protected]>");
	159	MODULE_DESCRIPTION("GPIO interface for Arizona devices");
	160	MODULE_LICENSE("GPL");
	161	MODULE_ALIAS("platform:arizona-gpio");