[linux-2.6-block.git] / drivers / gpio / gpio-wm8350.c

/*
 * gpiolib support for Wolfson WM835x PMICs
 *
 * Copyright 2009 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/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>

#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/gpio.h>

struct wm8350_gpio_data {
	struct wm8350 *wm8350;
	struct gpio_chip gpio_chip;
};

static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	struct wm8350 *wm8350 = wm8350_gpio->wm8350;

	return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
			       1 << offset);
}

static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	int ret;

	ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
	if (ret < 0)
		return ret;

	if (ret & (1 << offset))
		return 1;
	else
		return 0;
}

static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	struct wm8350 *wm8350 = wm8350_gpio->wm8350;

	if (value)
		wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
	else
		wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
}

static int wm8350_gpio_direction_out(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	int ret;

	ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
				1 << offset);
	if (ret < 0)
		return ret;

	/* Don't have an atomic direction/value setup */
	wm8350_gpio_set(chip, offset, value);

	return 0;
}

static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	struct wm8350 *wm8350 = wm8350_gpio->wm8350;

	if (!wm8350->irq_base)
		return -EINVAL;

	return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
}

static struct gpio_chip template_chip = {
	.label			= "wm8350",
	.owner			= THIS_MODULE,
	.direction_input	= wm8350_gpio_direction_in,
	.get			= wm8350_gpio_get,
	.direction_output	= wm8350_gpio_direction_out,
	.set			= wm8350_gpio_set,
	.to_irq			= wm8350_gpio_to_irq,
	.can_sleep		= true,
};

static int wm8350_gpio_probe(struct platform_device *pdev)
{
	struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
	struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
	struct wm8350_gpio_data *wm8350_gpio;
	int ret;

	wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
				   GFP_KERNEL);
	if (wm8350_gpio == NULL)
		return -ENOMEM;

	wm8350_gpio->wm8350 = wm8350;
	wm8350_gpio->gpio_chip = template_chip;
	wm8350_gpio->gpio_chip.ngpio = 13;
	wm8350_gpio->gpio_chip.parent = &pdev->dev;
	if (pdata && pdata->gpio_base)
		wm8350_gpio->gpio_chip.base = pdata->gpio_base;
	else
		wm8350_gpio->gpio_chip.base = -1;

	ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip,
				     wm8350_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, wm8350_gpio);

	return ret;
}

static struct platform_driver wm8350_gpio_driver = {
	.driver.name	= "wm8350-gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= wm8350_gpio_probe,
};

static int __init wm8350_gpio_init(void)
{
	return platform_driver_register(&wm8350_gpio_driver);
}
subsys_initcall(wm8350_gpio_init);

static void __exit wm8350_gpio_exit(void)
{
	platform_driver_unregister(&wm8350_gpio_driver);
}
module_exit(wm8350_gpio_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8350-gpio");
Commit	Line	Data
	1	/*
	2	* gpiolib support for Wolfson WM835x PMICs
	3	*
	4	* Copyright 2009 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/mfd/core.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/seq_file.h>
	22
	23	#include <linux/mfd/wm8350/core.h>
	24	#include <linux/mfd/wm8350/gpio.h>
	25
	26	struct wm8350_gpio_data {
	27	struct wm8350 *wm8350;
	28	struct gpio_chip gpio_chip;
	29	};
	30
	31	static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	32	{
	33	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	34	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	35
	36	return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
	37	1 << offset);
	38	}
	39
	40	static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
	41	{
	42	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	43	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	44	int ret;
	45
	46	ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
	47	if (ret < 0)
	48	return ret;
	49
	50	if (ret & (1 << offset))
	51	return 1;
	52	else
	53	return 0;
	54	}
	55
	56	static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	57	{
	58	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	59	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	60
	61	if (value)
	62	wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
	63	else
	64	wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
	65	}
	66
	67	static int wm8350_gpio_direction_out(struct gpio_chip *chip,
	68	unsigned offset, int value)
	69	{
	70	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	71	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	72	int ret;
	73
	74	ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
	75	1 << offset);
	76	if (ret < 0)
	77	return ret;
	78
	79	/* Don't have an atomic direction/value setup */
	80	wm8350_gpio_set(chip, offset, value);
	81
	82	return 0;
	83	}
	84
	85	static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	86	{
	87	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
	88	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	89
	90	if (!wm8350->irq_base)
	91	return -EINVAL;
	92
	93	return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
	94	}
	95
	96	static struct gpio_chip template_chip = {
	97	.label = "wm8350",
	98	.owner = THIS_MODULE,
	99	.direction_input = wm8350_gpio_direction_in,
	100	.get = wm8350_gpio_get,
	101	.direction_output = wm8350_gpio_direction_out,
	102	.set = wm8350_gpio_set,
	103	.to_irq = wm8350_gpio_to_irq,
	104	.can_sleep = true,
	105	};
	106
	107	static int wm8350_gpio_probe(struct platform_device *pdev)
	108	{
	109	struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
	110	struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
	111	struct wm8350_gpio_data *wm8350_gpio;
	112	int ret;
	113
	114	wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
	115	GFP_KERNEL);
	116	if (wm8350_gpio == NULL)
	117	return -ENOMEM;
	118
	119	wm8350_gpio->wm8350 = wm8350;
	120	wm8350_gpio->gpio_chip = template_chip;
	121	wm8350_gpio->gpio_chip.ngpio = 13;
	122	wm8350_gpio->gpio_chip.parent = &pdev->dev;
	123	if (pdata && pdata->gpio_base)
	124	wm8350_gpio->gpio_chip.base = pdata->gpio_base;
	125	else
	126	wm8350_gpio->gpio_chip.base = -1;
	127
	128	ret = devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip,
	129	wm8350_gpio);
	130	if (ret < 0) {
	131	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	132	return ret;
	133	}
	134
	135	platform_set_drvdata(pdev, wm8350_gpio);
	136
	137	return ret;
	138	}
	139
	140	static struct platform_driver wm8350_gpio_driver = {
	141	.driver.name = "wm8350-gpio",
	142	.driver.owner = THIS_MODULE,
	143	.probe = wm8350_gpio_probe,
	144	};
	145
	146	static int __init wm8350_gpio_init(void)
	147	{
	148	return platform_driver_register(&wm8350_gpio_driver);
	149	}
	150	subsys_initcall(wm8350_gpio_init);
	151
	152	static void __exit wm8350_gpio_exit(void)
	153	{
	154	platform_driver_unregister(&wm8350_gpio_driver);
	155	}
	156	module_exit(wm8350_gpio_exit);
	157
	158	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	159	MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
	160	MODULE_LICENSE("GPL");
	161	MODULE_ALIAS("platform:wm8350-gpio");