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

// SPDX-License-Identifier: GPL-2.0+
/*
 * Access to GPOs on TWL6040 chip
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Authors:
 *	Sergio Aguirre <saaguirre@ti.com>
 *	Peter Ujfalusi <peter.ujfalusi@ti.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/bitops.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 & BIT(offset));
}

static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset)
{
	/* This means "out" */
	return 0;
}

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 | BIT(offset);
	else
		gpoctl = ret & ~BIT(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,
	.get_direction		= twl6040gpo_get_direction,
	.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
b4f53ed9	1	// SPDX-License-Identifier: GPL-2.0+
70ffd691 PU	2	/*
	3	* Access to GPOs on TWL6040 chip
	4	*
	5	* Copyright (C) 2012 Texas Instruments, Inc.
	6	*
	7	* Authors:
	8	* Sergio Aguirre <saaguirre@ti.com>
	9	* Peter Ujfalusi <peter.ujfalusi@ti.com>
70ffd691 PU	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/kthread.h>
	15	#include <linux/irq.h>
fc4f8f32	16	#include <linux/gpio/driver.h>
70ffd691	17	#include <linux/platform_device.h>
4bef8bf2	18	#include <linux/bitops.h>
70ffd691 PU	19	#include <linux/of.h>
	20
	21	#include <linux/mfd/twl6040.h>
	22
70ffd691 PU	23	static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
70ffd691 PU	24	{
58383c78	25	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	26	int ret = 0;
	27
	28	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	29	if (ret < 0)
	30	return ret;
	31
4bef8bf2	32	return !!(ret & BIT(offset));
70ffd691 PU	33	}
70ffd691 PU	34
ba74bd5d LW	35	static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset)
	36	{
	37	/* This means "out" */
	38	return 0;
	39	}
	40
70ffd691 PU	41	static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
	42	int value)
	43	{
	44	/* This only drives GPOs, and can't change direction */
	45	return 0;
	46	}
	47
	48	static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
	49	{
58383c78	50	struct twl6040 *twl6040 = dev_get_drvdata(chip->parent->parent);
70ffd691 PU	51	int ret;
	52	u8 gpoctl;
	53
	54	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
	55	if (ret < 0)
	56	return;
	57
	58	if (value)
4bef8bf2	59	gpoctl = ret \| BIT(offset);
70ffd691	60	else
4bef8bf2	61	gpoctl = ret & ~BIT(offset);
70ffd691 PU	62
	63	twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
	64	}
	65
	66	static struct gpio_chip twl6040gpo_chip = {
	67	.label = "twl6040",
	68	.owner = THIS_MODULE,
	69	.get = twl6040gpo_get,
	70	.direction_output = twl6040gpo_direction_out,
ba74bd5d	71	.get_direction = twl6040gpo_get_direction,
70ffd691	72	.set = twl6040gpo_set,
9fb1f39e	73	.can_sleep = true,
70ffd691 PU	74	};
	75
	76	/----------------------------------------------------------------------/
	77
3836309d	78	static int gpo_twl6040_probe(struct platform_device *pdev)
70ffd691	79	{
70ffd691 PU	80	struct device *twl6040_core_dev = pdev->dev.parent;
	81	struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
	82	int ret;
	83
a5d28d79	84	twl6040gpo_chip.base = -1;
70ffd691 PU	85
	86	if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
	87	twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
	88	else
	89	twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
	90
58383c78	91	twl6040gpo_chip.parent = &pdev->dev;
70ffd691 PU	92	#ifdef CONFIG_OF_GPIO
	93	twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
	94	#endif
	95
fc0292a2	96	ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, NULL);
70ffd691 PU	97	if (ret < 0) {
	98	dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
	99	twl6040gpo_chip.ngpio = 0;
	100	}
	101
	102	return ret;
	103	}
	104
70ffd691 PU	105	/* Note: this hardware lives inside an I2C-based multi-function device. */
	106	MODULE_ALIAS("platform:twl6040-gpo");
	107
	108	static struct platform_driver gpo_twl6040_driver = {
	109	.driver = {
	110	.name = "twl6040-gpo",
70ffd691 PU	111	},
70ffd691 PU	112	.probe = gpo_twl6040_probe,
70ffd691 PU	113	};
	114
	115	module_platform_driver(gpo_twl6040_driver);
	116
	117	MODULE_AUTHOR("Texas Instruments, Inc.");
	118	MODULE_DESCRIPTION("GPO interface for TWL6040");
	119	MODULE_LICENSE("GPL");