mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
ba74bd5d5b
The gpiolib cannot deduce the fact that every line is output by itself, implement a .get_direction() callback so we can inspect this. Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
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");
|