linux/drivers/gpio/gpio-tps6586x.c

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// SPDX-License-Identifier: GPL-2.0
/*
* 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>
*/
#include <linux/errno.h>
#include <linux/gpio/driver.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;
gpio: change member .dev to .parent The name .dev in a struct is normally reserved for a struct device that is let us say a superclass to the thing described by the struct. struct gpio_chip stands out by confusingly using a struct device *dev to point to the parent device (such as a platform_device) that represents the hardware. As we want to give gpio_chip:s real devices, this is not working. We need to rename this member to parent. This was done by two coccinelle scripts, I guess it is possible to combine them into one, but I don't know such stuff. They look like this: @@ struct gpio_chip *var; @@ -var->dev +var->parent and: @@ struct gpio_chip var; @@ -var.dev +var.parent and: @@ struct bgpio_chip *var; @@ -var->gc.dev +var->gc.parent Plus a few instances of bgpio that I couldn't figure out how to teach Coccinelle to rewrite. This patch hits all over the place, but I *strongly* prefer this solution to any piecemal approaches that just exercise patch mechanics all over the place. It mainly hits drivers/gpio and drivers/pinctrl which is my own backyard anyway. Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Rafał Miłecki <zajec5@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Cc: Alek Du <alek.du@intel.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-11-04 08:56:26 +00:00
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);