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

/*
 * TI Palma series PMIC's GPIO driver.
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

struct palmas_gpio {
	struct gpio_chip gpio_chip;
	struct palmas *palmas;
};

struct palmas_device_data {
	int ngpio;
};

static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct palmas_gpio, gpio_chip);
}

static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct palmas_gpio *pg = to_palmas_gpio(gc);
	struct palmas *palmas = pg->palmas;
	unsigned int val;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
	if (ret < 0) {
		dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
		return ret;
	}

	if (val & BIT(offset))
		reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
	else
		reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;

	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
	if (ret < 0) {
		dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
		return ret;
	}
	return !!(val & BIT(offset));
}

static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
			int value)
{
	struct palmas_gpio *pg = to_palmas_gpio(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	if (gpio16)
		reg = (value) ?
			PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
	else
		reg = (value) ?
			PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;

	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
	if (ret < 0)
		dev_err(gc->dev, "Reg 0x%02x write failed, %d\n", reg, ret);
}

static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	struct palmas_gpio *pg = to_palmas_gpio(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	/* Set the initial value */
	palmas_gpio_set(gc, offset, value);

	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
				BIT(offset), BIT(offset));
	if (ret < 0)
		dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
	return ret;
}

static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	struct palmas_gpio *pg = to_palmas_gpio(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
	if (ret < 0)
		dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
	return ret;
}

static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct palmas_gpio *pg = to_palmas_gpio(gc);
	struct palmas *palmas = pg->palmas;

	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
}

static const struct palmas_device_data palmas_dev_data = {
	.ngpio = 8,
};

static const struct palmas_device_data tps80036_dev_data = {
	.ngpio = 16,
};

static const struct of_device_id of_palmas_gpio_match[] = {
	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
	{ },
};
MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);

static int palmas_gpio_probe(struct platform_device *pdev)
{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_platform_data *palmas_pdata;
	struct palmas_gpio *palmas_gpio;
	int ret;
	const struct of_device_id *match;
	const struct palmas_device_data *dev_data;

	match = of_match_device(of_palmas_gpio_match, &pdev->dev);
	dev_data = match->data;
	if (!dev_data)
		dev_data = &palmas_dev_data;

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

	palmas_gpio->palmas = palmas;
	palmas_gpio->gpio_chip.owner = THIS_MODULE;
	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
	palmas_gpio->gpio_chip.can_sleep = true;
	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
	palmas_gpio->gpio_chip.set	= palmas_gpio_set;
	palmas_gpio->gpio_chip.get	= palmas_gpio_get;
	palmas_gpio->gpio_chip.dev = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
#endif
	palmas_pdata = dev_get_platdata(palmas->dev);
	if (palmas_pdata && palmas_pdata->gpio_base)
		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
	else
		palmas_gpio->gpio_chip.base = -1;

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

	platform_set_drvdata(pdev, palmas_gpio);
	return ret;
}

static int palmas_gpio_remove(struct platform_device *pdev)
{
	struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);

	gpiochip_remove(&palmas_gpio->gpio_chip);
	return 0;
}

static struct platform_driver palmas_gpio_driver = {
	.driver.name	= "palmas-gpio",
	.driver.owner	= THIS_MODULE,
	.driver.of_match_table = of_palmas_gpio_match,
	.probe		= palmas_gpio_probe,
	.remove		= palmas_gpio_remove,
};

static int __init palmas_gpio_init(void)
{
	return platform_driver_register(&palmas_gpio_driver);
}
subsys_initcall(palmas_gpio_init);

static void __exit palmas_gpio_exit(void)
{
	platform_driver_unregister(&palmas_gpio_driver);
}
module_exit(palmas_gpio_exit);

MODULE_ALIAS("platform:palmas-gpio");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3d50a278 LD	1	/*
	2	* TI Palma series PMIC's GPIO driver.
	3	*
	4	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	5	*
	6	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <linux/gpio.h>
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/mfd/palmas.h>
	25	#include <linux/of.h>
	26	#include <linux/of_device.h>
	27	#include <linux/platform_device.h>
	28
	29	struct palmas_gpio {
	30	struct gpio_chip gpio_chip;
	31	struct palmas *palmas;
	32	};
	33
ca6af7b9 LD	34	struct palmas_device_data {
	35	int ngpio;
	36	};
	37
3d50a278 LD	38	static inline struct palmas_gpio to_palmas_gpio(struct gpio_chip chip)
	39	{
	40	return container_of(chip, struct palmas_gpio, gpio_chip);
	41	}
	42
	43	static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
	44	{
	45	struct palmas_gpio *pg = to_palmas_gpio(gc);
	46	struct palmas *palmas = pg->palmas;
	47	unsigned int val;
	48	int ret;
ca6af7b9 LD	49	unsigned int reg;
	50	int gpio16 = (offset/8);
	51
	52	offset %= 8;
	53	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278	54
ca6af7b9	55	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
3d50a278	56	if (ret < 0) {
ca6af7b9	57	dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
8b628c65 AC	58	return ret;
	59	}
	60
ca6af7b9 LD	61	if (val & BIT(offset))
	62	reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
	63	else
	64	reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
	65
	66	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
8b628c65	67	if (ret < 0) {
ca6af7b9	68	dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret);
3d50a278 LD	69	return ret;
	70	}
	71	return !!(val & BIT(offset));
	72	}
	73
	74	static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
	75	int value)
	76	{
	77	struct palmas_gpio *pg = to_palmas_gpio(gc);
	78	struct palmas *palmas = pg->palmas;
	79	int ret;
ca6af7b9 LD	80	unsigned int reg;
ca6af7b9 LD	81	int gpio16 = (offset/8);
3d50a278	82
ca6af7b9 LD	83	offset %= 8;
	84	if (gpio16)
	85	reg = (value) ?
	86	PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
3d50a278	87	else
ca6af7b9 LD	88	reg = (value) ?
	89	PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
	90
	91	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
3d50a278	92	if (ret < 0)
ca6af7b9	93	dev_err(gc->dev, "Reg 0x%02x write failed, %d\n", reg, ret);
3d50a278 LD	94	}
	95
	96	static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
	97	int value)
	98	{
	99	struct palmas_gpio *pg = to_palmas_gpio(gc);
	100	struct palmas *palmas = pg->palmas;
	101	int ret;
ca6af7b9 LD	102	unsigned int reg;
	103	int gpio16 = (offset/8);
	104
	105	offset %= 8;
	106	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278 LD	107
	108	/* Set the initial value */
	109	palmas_gpio_set(gc, offset, value);
	110
ca6af7b9 LD	111	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
ca6af7b9 LD	112	BIT(offset), BIT(offset));
3d50a278	113	if (ret < 0)
ca6af7b9	114	dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
3d50a278 LD	115	return ret;
	116	}
	117
	118	static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
	119	{
	120	struct palmas_gpio *pg = to_palmas_gpio(gc);
	121	struct palmas *palmas = pg->palmas;
	122	int ret;
ca6af7b9 LD	123	unsigned int reg;
	124	int gpio16 = (offset/8);
	125
	126	offset %= 8;
	127	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278	128
ca6af7b9	129	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
3d50a278	130	if (ret < 0)
ca6af7b9	131	dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret);
3d50a278 LD	132	return ret;
	133	}
	134
	135	static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
	136	{
	137	struct palmas_gpio *pg = to_palmas_gpio(gc);
	138	struct palmas *palmas = pg->palmas;
	139
	140	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
	141	}
	142
ca6af7b9 LD	143	static const struct palmas_device_data palmas_dev_data = {
	144	.ngpio = 8,
	145	};
	146
	147	static const struct palmas_device_data tps80036_dev_data = {
	148	.ngpio = 16,
	149	};
	150
722782fe	151	static const struct of_device_id of_palmas_gpio_match[] = {
ca6af7b9 LD	152	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
	153	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
	154	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
	155	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
	156	{ },
	157	};
	158	MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
	159
3d50a278 LD	160	static int palmas_gpio_probe(struct platform_device *pdev)
	161	{
	162	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	163	struct palmas_platform_data *palmas_pdata;
	164	struct palmas_gpio *palmas_gpio;
	165	int ret;
ca6af7b9 LD	166	const struct of_device_id *match;
	167	const struct palmas_device_data *dev_data;
	168
	169	match = of_match_device(of_palmas_gpio_match, &pdev->dev);
	170	dev_data = match->data;
	171	if (!dev_data)
	172	dev_data = &palmas_dev_data;
3d50a278 LD	173
	174	palmas_gpio = devm_kzalloc(&pdev->dev,
	175	sizeof(*palmas_gpio), GFP_KERNEL);
5605beb2	176	if (!palmas_gpio)
3d50a278	177	return -ENOMEM;
3d50a278 LD	178
	179	palmas_gpio->palmas = palmas;
	180	palmas_gpio->gpio_chip.owner = THIS_MODULE;
	181	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
ca6af7b9	182	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
9fb1f39e	183	palmas_gpio->gpio_chip.can_sleep = true;
3d50a278 LD	184	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
	185	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
	186	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
	187	palmas_gpio->gpio_chip.set = palmas_gpio_set;
	188	palmas_gpio->gpio_chip.get = palmas_gpio_get;
	189	palmas_gpio->gpio_chip.dev = &pdev->dev;
	190	#ifdef CONFIG_OF_GPIO
5763318f	191	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
3d50a278 LD	192	#endif
	193	palmas_pdata = dev_get_platdata(palmas->dev);
	194	if (palmas_pdata && palmas_pdata->gpio_base)
	195	palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
	196	else
	197	palmas_gpio->gpio_chip.base = -1;
	198
	199	ret = gpiochip_add(&palmas_gpio->gpio_chip);
	200	if (ret < 0) {
	201	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	202	return ret;
	203	}
	204
	205	platform_set_drvdata(pdev, palmas_gpio);
	206	return ret;
	207	}
	208
	209	static int palmas_gpio_remove(struct platform_device *pdev)
	210	{
	211	struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
	212
9f5132ae	213	gpiochip_remove(&palmas_gpio->gpio_chip);
9f5132ae	214	return 0;
3d50a278 LD	215	}
	216
	217	static struct platform_driver palmas_gpio_driver = {
	218	.driver.name = "palmas-gpio",
	219	.driver.owner = THIS_MODULE,
5763318f	220	.driver.of_match_table = of_palmas_gpio_match,
3d50a278 LD	221	.probe = palmas_gpio_probe,
	222	.remove = palmas_gpio_remove,
	223	};
	224
	225	static int __init palmas_gpio_init(void)
	226	{
	227	return platform_driver_register(&palmas_gpio_driver);
	228	}
	229	subsys_initcall(palmas_gpio_init);
	230
	231	static void __exit palmas_gpio_exit(void)
	232	{
	233	platform_driver_unregister(&palmas_gpio_driver);
	234	}
	235	module_exit(palmas_gpio_exit);
	236
	237	MODULE_ALIAS("platform:palmas-gpio");
	238	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	239	MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
	240	MODULE_LICENSE("GPL v2");