[linux-2.6-block.git] / drivers / gpio / gpio-twl6040.c

/*
 * Access to GPOs on TWL6040 chip
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Authors:
 *	Sergio Aguirre <saaguirre@ti.com>
 *	Peter Ujfalusi <peter.ujfalusi@ti.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.
 *
 * This program is distributed in the hope that 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/of.h>

#include <linux/mfd/twl6040.h>

static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
{
	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
	int ret = 0;

	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	if (ret < 0)
		return ret;

	return (ret >> offset) & 1;
}

static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
				    int value)
{
	/* This only drives GPOs, and can't change direction */
	return 0;
}

static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
	int ret;
	u8 gpoctl;

	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	if (ret < 0)
		return;

	if (value)
		gpoctl = ret | (1 << offset);
	else
		gpoctl = ret & ~(1 << offset);

	twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
}

static struct gpio_chip twl6040gpo_chip = {
	.label			= "twl6040",
	.owner			= THIS_MODULE,
	.get			= twl6040gpo_get,
	.direction_output	= twl6040gpo_direction_out,
	.set			= twl6040gpo_set,
	.can_sleep		= true,
};

/*----------------------------------------------------------------------*/

static int gpo_twl6040_probe(struct platform_device *pdev)
{
	struct device *twl6040_core_dev = pdev->dev.parent;
	struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
	int ret;

	twl6040gpo_chip.base = -1;

	if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
		twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
	else
		twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */

	twl6040gpo_chip.parent = &pdev->dev;
#ifdef CONFIG_OF_GPIO
	twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
#endif

	ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
	if (ret < 0) {
		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
		twl6040gpo_chip.ngpio = 0;
	}

	return ret;
}

/* Note:  this hardware lives inside an I2C-based multi-function device. */
MODULE_ALIAS("platform:twl6040-gpo");

static struct platform_driver gpo_twl6040_driver = {
	.driver = {
		.name	= "twl6040-gpo",
	},
	.probe		= gpo_twl6040_probe,
};

module_platform_driver(gpo_twl6040_driver);

MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("GPO interface for TWL6040");
MODULE_LICENSE("GPL");
Commit	Line	Data
70ffd691 PU	1	/*
	2	* Access to GPOs on TWL6040 chip
	3	*
	4	* Copyright (C) 2012 Texas Instruments, Inc.
	5	*
	6	* Authors:
	7	* Sergio Aguirre <saaguirre@ti.com>
	8	* Peter Ujfalusi <peter.ujfalusi@ti.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24
	25	#include <linux/module.h>
	26	#include <linux/init.h>
	27	#include <linux/kthread.h>
	28	#include <linux/irq.h>
	29	#include <linux/gpio.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/of.h>
	32
	33	#include <linux/mfd/twl6040.h>
	34
70ffd691 PU	35	static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
70ffd691 PU	36	{
58383c78	37	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	38	int ret = 0;
	39
	40	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	41	if (ret < 0)
	42	return ret;
	43
	44	return (ret >> offset) & 1;
	45	}
	46
	47	static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
	48	int value)
	49	{
	50	/* This only drives GPOs, and can't change direction */
	51	return 0;
	52	}
	53
	54	static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
	55	{
58383c78	56	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	57	int ret;
	58	u8 gpoctl;
	59
	60	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	61	if (ret < 0)
	62	return;
	63
	64	if (value)
	65	gpoctl = ret \| (1 << offset);
	66	else
	67	gpoctl = ret & ~(1 << offset);
	68
	69	twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
	70	}
	71
	72	static struct gpio_chip twl6040gpo_chip = {
	73	.label = "twl6040",
	74	.owner = THIS_MODULE,
	75	.get = twl6040gpo_get,
	76	.direction_output = twl6040gpo_direction_out,
	77	.set = twl6040gpo_set,
9fb1f39e	78	.can_sleep = true,
70ffd691 PU	79	};
	80
	81	/----------------------------------------------------------------------/
	82
3836309d	83	static int gpo_twl6040_probe(struct platform_device *pdev)
70ffd691	84	{
70ffd691 PU	85	struct device *twl6040_core_dev = pdev->dev.parent;
	86	struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
	87	int ret;
	88
a5d28d79	89	twl6040gpo_chip.base = -1;
70ffd691 PU	90
	91	if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
	92	twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
	93	else
	94	twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
	95
58383c78	96	twl6040gpo_chip.parent = &pdev->dev;
70ffd691 PU	97	#ifdef CONFIG_OF_GPIO
	98	twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
	99	#endif
	100
fc0292a2	101	ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
70ffd691 PU	102	if (ret < 0) {
	103	dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
	104	twl6040gpo_chip.ngpio = 0;
	105	}
	106
	107	return ret;
	108	}
	109
70ffd691 PU	110	/* Note: this hardware lives inside an I2C-based multi-function device. */
	111	MODULE_ALIAS("platform:twl6040-gpo");
	112
	113	static struct platform_driver gpo_twl6040_driver = {
	114	.driver = {
	115	.name = "twl6040-gpo",
70ffd691 PU	116	},
70ffd691 PU	117	.probe = gpo_twl6040_probe,
70ffd691 PU	118	};
	119
	120	module_platform_driver(gpo_twl6040_driver);
	121
	122	MODULE_AUTHOR("Texas Instruments, Inc.");
	123	MODULE_DESCRIPTION("GPO interface for TWL6040");
	124	MODULE_LICENSE("GPL");