mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
2ec64c9d0d
A platform_driver need not set an owner since it will be populated by platform_driver_register(). Likewise for mcb_driver (gpio-menz127.c). Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
|
|
* TI TPS6586x GPIO driver
|
|
*
|
|
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
|
|
* Author: Laxman dewangan <ldewangan@nvidia.com>
|
|
*
|
|
* Based on tps6586x.c
|
|
* Copyright (c) 2010 CompuLab Ltd.
|
|
* Mike Rapoport <mike@compulab.co.il>
|
|
*
|
|
* 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/errno.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mfd/tps6586x.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
/* GPIO control registers */
|
|
#define TPS6586X_GPIOSET1 0x5d
|
|
#define TPS6586X_GPIOSET2 0x5e
|
|
|
|
struct tps6586x_gpio {
|
|
struct gpio_chip gpio_chip;
|
|
struct device *parent;
|
|
};
|
|
|
|
static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
|
|
uint8_t val;
|
|
int ret;
|
|
|
|
ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return !!(val & (1 << offset));
|
|
}
|
|
|
|
static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
|
|
int value)
|
|
{
|
|
struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
|
|
|
|
tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
|
|
value << offset, 1 << offset);
|
|
}
|
|
|
|
static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
|
|
int value)
|
|
{
|
|
struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
|
|
uint8_t val, mask;
|
|
|
|
tps6586x_gpio_set(gc, offset, value);
|
|
|
|
val = 0x1 << (offset * 2);
|
|
mask = 0x3 << (offset * 2);
|
|
|
|
return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
|
|
val, mask);
|
|
}
|
|
|
|
static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
|
|
|
|
return tps6586x_irq_get_virq(tps6586x_gpio->parent,
|
|
TPS6586X_INT_PLDO_0 + offset);
|
|
}
|
|
|
|
static int tps6586x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct tps6586x_platform_data *pdata;
|
|
struct tps6586x_gpio *tps6586x_gpio;
|
|
int ret;
|
|
|
|
pdata = dev_get_platdata(pdev->dev.parent);
|
|
tps6586x_gpio = devm_kzalloc(&pdev->dev,
|
|
sizeof(*tps6586x_gpio), GFP_KERNEL);
|
|
if (!tps6586x_gpio)
|
|
return -ENOMEM;
|
|
|
|
tps6586x_gpio->parent = pdev->dev.parent;
|
|
|
|
tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
|
|
tps6586x_gpio->gpio_chip.label = pdev->name;
|
|
tps6586x_gpio->gpio_chip.parent = &pdev->dev;
|
|
tps6586x_gpio->gpio_chip.ngpio = 4;
|
|
tps6586x_gpio->gpio_chip.can_sleep = true;
|
|
|
|
/* FIXME: add handling of GPIOs as dedicated inputs */
|
|
tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
|
|
tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
|
|
tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
|
|
tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
|
|
|
|
#ifdef CONFIG_OF_GPIO
|
|
tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
|
|
#endif
|
|
if (pdata && pdata->gpio_base)
|
|
tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
|
|
else
|
|
tps6586x_gpio->gpio_chip.base = -1;
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
|
|
tps6586x_gpio);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, tps6586x_gpio);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver tps6586x_gpio_driver = {
|
|
.driver.name = "tps6586x-gpio",
|
|
.probe = tps6586x_gpio_probe,
|
|
};
|
|
|
|
static int __init tps6586x_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&tps6586x_gpio_driver);
|
|
}
|
|
subsys_initcall(tps6586x_gpio_init);
|