Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Alexander Shiyan |
615 |
85.42% |
1 |
7.69% |
| Bartosz Golaszewski |
54 |
7.50% |
1 |
7.69% |
| Andy Shevchenko |
21 |
2.92% |
4 |
30.77% |
| Matti Vaittinen |
8 |
1.11% |
1 |
7.69% |
| Thierry Reding |
7 |
0.97% |
1 |
7.69% |
| Laxman Dewangan |
5 |
0.69% |
1 |
7.69% |
| Linus Walleij |
5 |
0.69% |
1 |
7.69% |
| Thomas Gleixner |
2 |
0.28% |
1 |
7.69% |
| Enrico Weigelt |
2 |
0.28% |
1 |
7.69% |
| Nicholas Krause |
1 |
0.14% |
1 |
7.69% |
| Total |
720 |
|
13 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 74xx MMIO GPIO driver
*
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
*/
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/generic.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#define MMIO_74XX_DIR_IN BIT(8)
#define MMIO_74XX_DIR_OUT BIT(9)
#define MMIO_74XX_BIT_CNT(x) ((x) & GENMASK(7, 0))
struct mmio_74xx_gpio_priv {
struct gpio_generic_chip gen_gc;
unsigned int 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);
if (priv->flags & MMIO_74XX_DIR_IN)
return 0;
return -ENOTSUPP;
}
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)
return gpio_generic_chip_set(&priv->gen_gc, gpio, val);
return -ENOTSUPP;
}
static int mmio_74xx_gpio_probe(struct platform_device *pdev)
{
struct gpio_generic_chip_config config = { };
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)device_get_match_data(&pdev->dev);
dat = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dat))
return PTR_ERR(dat);
config.dev = &pdev->dev;
config.sz = DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8);
config.dat = dat;
err = gpio_generic_chip_init(&priv->gen_gc, &config);
if (err)
return err;
priv->gen_gc.gc.direction_input = mmio_74xx_dir_in;
priv->gen_gc.gc.direction_output = mmio_74xx_dir_out;
priv->gen_gc.gc.get_direction = mmio_74xx_get_direction;
priv->gen_gc.gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
priv->gen_gc.gc.owner = THIS_MODULE;
return devm_gpiochip_add_data(&pdev->dev, &priv->gen_gc.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");