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

/*
 * Access to GPOs on TWL6040 chip
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Authors:
 *	Sergio Aguirre <[email protected]>
 *	Peter Ujfalusi <[email protected]>
 *
 * 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 struct gpio_chip twl6040gpo_chip;

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 <[email protected]>
	8	* Peter Ujfalusi <[email protected]>
	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
	35	static struct gpio_chip twl6040gpo_chip;
	36
	37	static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
	38	{
58383c78	39	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	40	int ret = 0;
	41
	42	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	43	if (ret < 0)
	44	return ret;
	45
	46	return (ret >> offset) & 1;
	47	}
	48
	49	static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
	50	int value)
	51	{
	52	/* This only drives GPOs, and can't change direction */
	53	return 0;
	54	}
	55
	56	static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
	57	{
58383c78	58	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	59	int ret;
	60	u8 gpoctl;
	61
	62	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	63	if (ret < 0)
	64	return;
	65
	66	if (value)
	67	gpoctl = ret \| (1 << offset);
	68	else
	69	gpoctl = ret & ~(1 << offset);
	70
	71	twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
	72	}
	73
	74	static struct gpio_chip twl6040gpo_chip = {
	75	.label = "twl6040",
	76	.owner = THIS_MODULE,
	77	.get = twl6040gpo_get,
	78	.direction_output = twl6040gpo_direction_out,
	79	.set = twl6040gpo_set,
9fb1f39e	80	.can_sleep = true,
70ffd691 PU	81	};
	82
	83	/----------------------------------------------------------------------/
	84
3836309d	85	static int gpo_twl6040_probe(struct platform_device *pdev)
70ffd691	86	{
70ffd691 PU	87	struct device *twl6040_core_dev = pdev->dev.parent;
	88	struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
	89	int ret;
	90
a5d28d79	91	twl6040gpo_chip.base = -1;
70ffd691 PU	92
	93	if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
	94	twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
	95	else
	96	twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
	97
58383c78	98	twl6040gpo_chip.parent = &pdev->dev;
70ffd691 PU	99	#ifdef CONFIG_OF_GPIO
	100	twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
	101	#endif
	102
fc0292a2	103	ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
70ffd691 PU	104	if (ret < 0) {
	105	dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
	106	twl6040gpo_chip.ngpio = 0;
	107	}
	108
	109	return ret;
	110	}
	111
70ffd691 PU	112	/* Note: this hardware lives inside an I2C-based multi-function device. */
	113	MODULE_ALIAS("platform:twl6040-gpo");
	114
	115	static struct platform_driver gpo_twl6040_driver = {
	116	.driver = {
	117	.name = "twl6040-gpo",
70ffd691 PU	118	},
70ffd691 PU	119	.probe = gpo_twl6040_probe,
70ffd691 PU	120	};
	121
	122	module_platform_driver(gpo_twl6040_driver);
	123
	124	MODULE_AUTHOR("Texas Instruments, Inc.");
	125	MODULE_DESCRIPTION("GPO interface for TWL6040");
	126	MODULE_LICENSE("GPL");