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

// SPDX-License-Identifier: GPL-2.0+
/*
 * gpiolib support for Wolfson WM835x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 */

#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.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 const 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;

	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;

	return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
}

static struct platform_driver wm8350_gpio_driver = {
	.driver.name	= "wm8350-gpio",
	.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
66dbe750	1	// SPDX-License-Identifier: GPL-2.0+
38f6ce45	2	/*
c103de24	3	* gpiolib support for Wolfson WM835x PMICs
38f6ce45 MB	4	*
	5	* Copyright 2009 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	8	*
38f6ce45 MB	9	*/
38f6ce45 MB	10
10833c4b	11	#include <linux/gpio/driver.h>
275d1356	12	#include <linux/kernel.h>
38f6ce45	13	#include <linux/mfd/core.h>
275d1356	14	#include <linux/module.h>
38f6ce45	15	#include <linux/platform_device.h>
275d1356	16	#include <linux/slab.h>
38f6ce45 MB	17
	18	#include <linux/mfd/wm8350/core.h>
	19	#include <linux/mfd/wm8350/gpio.h>
	20
	21	struct wm8350_gpio_data {
	22	struct wm8350 *wm8350;
	23	struct gpio_chip gpio_chip;
	24	};
	25
38f6ce45 MB	26	static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
38f6ce45 MB	27	{
dfcdf721	28	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38f6ce45 MB	29	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	30
	31	return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
	32	1 << offset);
	33	}
	34
	35	static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
	36	{
dfcdf721	37	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38f6ce45 MB	38	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	39	int ret;
	40
	41	ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
	42	if (ret < 0)
	43	return ret;
	44
	45	if (ret & (1 << offset))
	46	return 1;
	47	else
	48	return 0;
	49	}
	50
	51	static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	52	{
dfcdf721	53	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38f6ce45 MB	54	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	55
	56	if (value)
	57	wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
	58	else
	59	wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
	60	}
	61
	62	static int wm8350_gpio_direction_out(struct gpio_chip *chip,
	63	unsigned offset, int value)
	64	{
dfcdf721	65	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38f6ce45 MB	66	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	67	int ret;
	68
	69	ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
	70	1 << offset);
	71	if (ret < 0)
	72	return ret;
	73
	74	/* Don't have an atomic direction/value setup */
	75	wm8350_gpio_set(chip, offset, value);
	76
	77	return 0;
	78	}
	79
	80	static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	81	{
dfcdf721	82	struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip);
38f6ce45 MB	83	struct wm8350 *wm8350 = wm8350_gpio->wm8350;
	84
	85	if (!wm8350->irq_base)
	86	return -EINVAL;
	87
	88	return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
	89	}
	90
e35b5ab0	91	static const struct gpio_chip template_chip = {
38f6ce45 MB	92	.label = "wm8350",
	93	.owner = THIS_MODULE,
	94	.direction_input = wm8350_gpio_direction_in,
	95	.get = wm8350_gpio_get,
	96	.direction_output = wm8350_gpio_direction_out,
	97	.set = wm8350_gpio_set,
	98	.to_irq = wm8350_gpio_to_irq,
9fb1f39e	99	.can_sleep = true,
38f6ce45 MB	100	};
38f6ce45 MB	101
3836309d	102	static int wm8350_gpio_probe(struct platform_device *pdev)
38f6ce45 MB	103	{
38f6ce45 MB	104	struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
e56aee18	105	struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
38f6ce45	106	struct wm8350_gpio_data *wm8350_gpio;
38f6ce45	107
5b425438 AL	108	wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
5b425438 AL	109	GFP_KERNEL);
38f6ce45 MB	110	if (wm8350_gpio == NULL)
	111	return -ENOMEM;
	112
	113	wm8350_gpio->wm8350 = wm8350;
	114	wm8350_gpio->gpio_chip = template_chip;
	115	wm8350_gpio->gpio_chip.ngpio = 13;
58383c78	116	wm8350_gpio->gpio_chip.parent = &pdev->dev;
38f6ce45 MB	117	if (pdata && pdata->gpio_base)
	118	wm8350_gpio->gpio_chip.base = pdata->gpio_base;
	119	else
	120	wm8350_gpio->gpio_chip.base = -1;
	121
05332606	122	return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio);
38f6ce45 MB	123	}
38f6ce45 MB	124
38f6ce45 MB	125	static struct platform_driver wm8350_gpio_driver = {
38f6ce45 MB	126	.driver.name = "wm8350-gpio",
38f6ce45	127	.probe = wm8350_gpio_probe,
38f6ce45 MB	128	};
	129
	130	static int __init wm8350_gpio_init(void)
	131	{
	132	return platform_driver_register(&wm8350_gpio_driver);
	133	}
	134	subsys_initcall(wm8350_gpio_init);
	135
	136	static void __exit wm8350_gpio_exit(void)
	137	{
	138	platform_driver_unregister(&wm8350_gpio_driver);
	139	}
	140	module_exit(wm8350_gpio_exit);
	141
	142	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	143	MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
	144	MODULE_LICENSE("GPL");
	145	MODULE_ALIAS("platform:wm8350-gpio");