82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
|
|
* GPIO driver for the TS-4800 board
|
|
*
|
|
* Copyright (c) 2016 - Savoir-faire Linux
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define DEFAULT_PIN_NUMBER 16
|
|
#define INPUT_REG_OFFSET 0x00
|
|
#define OUTPUT_REG_OFFSET 0x02
|
|
#define DIRECTION_REG_OFFSET 0x04
|
|
|
|
static int ts4800_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node;
|
|
struct gpio_chip *chip;
|
|
void __iomem *base_addr;
|
|
int retval;
|
|
u32 ngpios;
|
|
|
|
chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
base_addr = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(base_addr))
|
|
return PTR_ERR(base_addr);
|
|
|
|
node = pdev->dev.of_node;
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
retval = of_property_read_u32(node, "ngpios", &ngpios);
|
|
if (retval == -EINVAL)
|
|
ngpios = DEFAULT_PIN_NUMBER;
|
|
else if (retval)
|
|
return retval;
|
|
|
|
retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET,
|
|
base_addr + OUTPUT_REG_OFFSET, NULL,
|
|
base_addr + DIRECTION_REG_OFFSET, NULL, 0);
|
|
if (retval) {
|
|
dev_err(&pdev->dev, "bgpio_init failed\n");
|
|
return retval;
|
|
}
|
|
|
|
chip->ngpio = ngpios;
|
|
|
|
platform_set_drvdata(pdev, chip);
|
|
|
|
return devm_gpiochip_add_data(&pdev->dev, chip, NULL);
|
|
}
|
|
|
|
static const struct of_device_id ts4800_gpio_of_match[] = {
|
|
{ .compatible = "technologic,ts4800-gpio", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ts4800_gpio_of_match);
|
|
|
|
static struct platform_driver ts4800_gpio_driver = {
|
|
.driver = {
|
|
.name = "ts4800-gpio",
|
|
.of_match_table = ts4800_gpio_of_match,
|
|
},
|
|
.probe = ts4800_gpio_probe,
|
|
};
|
|
|
|
module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);
|
|
|
|
MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");
|
|
MODULE_DESCRIPTION("TS4800 FPGA GPIO driver");
|
|
MODULE_LICENSE("GPL v2");
|