[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 int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct palmas_gpio *pg = gpiochip_get_data(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->parent, "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->parent, "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 = gpiochip_get_data(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->parent, "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 = gpiochip_get_data(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->parent, "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 = gpiochip_get_data(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->parent, "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 = gpiochip_get_data(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);
	if (!match)
		return -ENODEV;
	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.parent = &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 = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
				     palmas_gpio);
	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 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,
};

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 int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
3d50a278 LD	39	{
5b68cc2d	40	struct palmas_gpio *pg = gpiochip_get_data(gc);
3d50a278 LD	41	struct palmas *palmas = pg->palmas;
	42	unsigned int val;
	43	int ret;
ca6af7b9 LD	44	unsigned int reg;
	45	int gpio16 = (offset/8);
	46
	47	offset %= 8;
	48	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278	49
ca6af7b9	50	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
3d50a278	51	if (ret < 0) {
58383c78	52	dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
8b628c65 AC	53	return ret;
	54	}
	55
ca6af7b9 LD	56	if (val & BIT(offset))
	57	reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
	58	else
	59	reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
	60
	61	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
8b628c65	62	if (ret < 0) {
58383c78	63	dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
3d50a278 LD	64	return ret;
	65	}
	66	return !!(val & BIT(offset));
	67	}
	68
	69	static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
	70	int value)
	71	{
5b68cc2d	72	struct palmas_gpio *pg = gpiochip_get_data(gc);
3d50a278 LD	73	struct palmas *palmas = pg->palmas;
3d50a278 LD	74	int ret;
ca6af7b9 LD	75	unsigned int reg;
ca6af7b9 LD	76	int gpio16 = (offset/8);
3d50a278	77
ca6af7b9 LD	78	offset %= 8;
	79	if (gpio16)
	80	reg = (value) ?
	81	PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
3d50a278	82	else
ca6af7b9 LD	83	reg = (value) ?
	84	PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
	85
	86	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
3d50a278	87	if (ret < 0)
58383c78	88	dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
3d50a278 LD	89	}
	90
	91	static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
	92	int value)
	93	{
5b68cc2d	94	struct palmas_gpio *pg = gpiochip_get_data(gc);
3d50a278 LD	95	struct palmas *palmas = pg->palmas;
3d50a278 LD	96	int ret;
ca6af7b9 LD	97	unsigned int reg;
	98	int gpio16 = (offset/8);
	99
	100	offset %= 8;
	101	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278 LD	102
	103	/* Set the initial value */
	104	palmas_gpio_set(gc, offset, value);
	105
ca6af7b9 LD	106	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
ca6af7b9 LD	107	BIT(offset), BIT(offset));
3d50a278	108	if (ret < 0)
58383c78 LW	109	dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
58383c78 LW	110	ret);
3d50a278 LD	111	return ret;
	112	}
	113
	114	static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
	115	{
5b68cc2d	116	struct palmas_gpio *pg = gpiochip_get_data(gc);
3d50a278 LD	117	struct palmas *palmas = pg->palmas;
3d50a278 LD	118	int ret;
ca6af7b9 LD	119	unsigned int reg;
	120	int gpio16 = (offset/8);
	121
	122	offset %= 8;
	123	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
3d50a278	124
ca6af7b9	125	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
3d50a278	126	if (ret < 0)
58383c78 LW	127	dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
58383c78 LW	128	ret);
3d50a278 LD	129	return ret;
	130	}
	131
	132	static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
	133	{
5b68cc2d	134	struct palmas_gpio *pg = gpiochip_get_data(gc);
3d50a278 LD	135	struct palmas *palmas = pg->palmas;
	136
	137	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
	138	}
	139
ca6af7b9 LD	140	static const struct palmas_device_data palmas_dev_data = {
	141	.ngpio = 8,
	142	};
	143
	144	static const struct palmas_device_data tps80036_dev_data = {
	145	.ngpio = 16,
	146	};
	147
722782fe	148	static const struct of_device_id of_palmas_gpio_match[] = {
ca6af7b9 LD	149	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
	150	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
	151	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
	152	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
	153	{ },
	154	};
	155	MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
	156
3d50a278 LD	157	static int palmas_gpio_probe(struct platform_device *pdev)
	158	{
	159	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	160	struct palmas_platform_data *palmas_pdata;
	161	struct palmas_gpio *palmas_gpio;
	162	int ret;
ca6af7b9 LD	163	const struct of_device_id *match;
	164	const struct palmas_device_data *dev_data;
	165
	166	match = of_match_device(of_palmas_gpio_match, &pdev->dev);
5664de25 LC	167	if (!match)
5664de25 LC	168	return -ENODEV;
ca6af7b9 LD	169	dev_data = match->data;
	170	if (!dev_data)
	171	dev_data = &palmas_dev_data;
3d50a278 LD	172
	173	palmas_gpio = devm_kzalloc(&pdev->dev,
	174	sizeof(*palmas_gpio), GFP_KERNEL);
5605beb2	175	if (!palmas_gpio)
3d50a278	176	return -ENOMEM;
3d50a278 LD	177
	178	palmas_gpio->palmas = palmas;
	179	palmas_gpio->gpio_chip.owner = THIS_MODULE;
	180	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
ca6af7b9	181	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
9fb1f39e	182	palmas_gpio->gpio_chip.can_sleep = true;
3d50a278 LD	183	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
	184	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
	185	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
	186	palmas_gpio->gpio_chip.set = palmas_gpio_set;
	187	palmas_gpio->gpio_chip.get = palmas_gpio_get;
58383c78	188	palmas_gpio->gpio_chip.parent = &pdev->dev;
3d50a278	189	#ifdef CONFIG_OF_GPIO
5763318f	190	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
3d50a278 LD	191	#endif
	192	palmas_pdata = dev_get_platdata(palmas->dev);
	193	if (palmas_pdata && palmas_pdata->gpio_base)
	194	palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
	195	else
	196	palmas_gpio->gpio_chip.base = -1;
	197
297bf067 LD	198	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
297bf067 LD	199	palmas_gpio);
3d50a278 LD	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
3d50a278 LD	209	static struct platform_driver palmas_gpio_driver = {
	210	.driver.name = "palmas-gpio",
	211	.driver.owner = THIS_MODULE,
5763318f	212	.driver.of_match_table = of_palmas_gpio_match,
3d50a278	213	.probe = palmas_gpio_probe,
3d50a278 LD	214	};
	215
	216	static int __init palmas_gpio_init(void)
	217	{
	218	return platform_driver_register(&palmas_gpio_driver);
	219	}
	220	subsys_initcall(palmas_gpio_init);
	221
	222	static void __exit palmas_gpio_exit(void)
	223	{
	224	platform_driver_unregister(&palmas_gpio_driver);
	225	}
	226	module_exit(palmas_gpio_exit);
	227
	228	MODULE_ALIAS("platform:palmas-gpio");
	229	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	230	MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
	231	MODULE_LICENSE("GPL v2");