mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Matti Vaittinen](/assets/img/avatar_default.png)
It's hard for occasional GPIO code reader/writer to know if values 0/1 equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT to help them out. NOTE - for gpio-amd-fch and gpio-bd9571mwv: This commit also changes the return value for direction get to equal 1 for direction INPUT. Prior this commit these drivers might have returned some other positive value but 1 for INPUT. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 74xx MMIO GPIO driver
|
|
*
|
|
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define MMIO_74XX_DIR_IN (0 << 8)
|
|
#define MMIO_74XX_DIR_OUT (1 << 8)
|
|
#define MMIO_74XX_BIT_CNT(x) ((x) & 0xff)
|
|
|
|
struct mmio_74xx_gpio_priv {
|
|
struct gpio_chip gc;
|
|
unsigned flags;
|
|
};
|
|
|
|
static const struct of_device_id mmio_74xx_gpio_ids[] = {
|
|
{
|
|
.compatible = "ti,741g125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 1),
|
|
},
|
|
{
|
|
.compatible = "ti,742g125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 2),
|
|
},
|
|
{
|
|
.compatible = "ti,74125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 4),
|
|
},
|
|
{
|
|
.compatible = "ti,74365",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 6),
|
|
},
|
|
{
|
|
.compatible = "ti,74244",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 8),
|
|
},
|
|
{
|
|
.compatible = "ti,741624",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 16),
|
|
},
|
|
{
|
|
.compatible = "ti,741g74",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 1),
|
|
},
|
|
{
|
|
.compatible = "ti,7474",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 2),
|
|
},
|
|
{
|
|
.compatible = "ti,74175",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 4),
|
|
},
|
|
{
|
|
.compatible = "ti,74174",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 6),
|
|
},
|
|
{
|
|
.compatible = "ti,74273",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 8),
|
|
},
|
|
{
|
|
.compatible = "ti,7416374",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 16),
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
|
|
|
|
static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
if (priv->flags & MMIO_74XX_DIR_OUT)
|
|
return GPIO_LINE_DIRECTION_OUT;
|
|
|
|
return GPIO_LINE_DIRECTION_IN;
|
|
}
|
|
|
|
static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
|
|
}
|
|
|
|
static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
if (priv->flags & MMIO_74XX_DIR_OUT) {
|
|
gc->set(gc, gpio, val);
|
|
return 0;
|
|
}
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int mmio_74xx_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv;
|
|
void __iomem *dat;
|
|
int err;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->flags = (uintptr_t)of_device_get_match_data(&pdev->dev);
|
|
|
|
dat = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(dat))
|
|
return PTR_ERR(dat);
|
|
|
|
err = bgpio_init(&priv->gc, &pdev->dev,
|
|
DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
|
|
dat, NULL, NULL, NULL, NULL, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
priv->gc.direction_input = mmio_74xx_dir_in;
|
|
priv->gc.direction_output = mmio_74xx_dir_out;
|
|
priv->gc.get_direction = mmio_74xx_get_direction;
|
|
priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
|
|
priv->gc.owner = THIS_MODULE;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
|
|
}
|
|
|
|
static struct platform_driver mmio_74xx_gpio_driver = {
|
|
.driver = {
|
|
.name = "74xx-mmio-gpio",
|
|
.of_match_table = mmio_74xx_gpio_ids,
|
|
},
|
|
.probe = mmio_74xx_gpio_probe,
|
|
};
|
|
module_platform_driver(mmio_74xx_gpio_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
|
|
MODULE_DESCRIPTION("74xx MMIO GPIO driver");
|