Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIO driver for the TS-4800 board
4 *
5 * Copyright (c) 2016 - Savoir-faire Linux
6 */
7
8#include <linux/gpio/driver.h>
9#include <linux/gpio/generic.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/property.h>
13
14#define INPUT_REG_OFFSET 0x00
15#define OUTPUT_REG_OFFSET 0x02
16#define DIRECTION_REG_OFFSET 0x04
17
18static int ts4800_gpio_probe(struct platform_device *pdev)
19{
20 struct gpio_generic_chip_config config;
21 struct device *dev = &pdev->dev;
22 struct gpio_generic_chip *chip;
23 void __iomem *base_addr;
24 int retval;
25
26 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
27 if (!chip)
28 return -ENOMEM;
29
30 base_addr = devm_platform_ioremap_resource(pdev, 0);
31 if (IS_ERR(base_addr))
32 return PTR_ERR(base_addr);
33
34 config = (struct gpio_generic_chip_config) {
35 .dev = dev,
36 .sz = 2,
37 .dat = base_addr + INPUT_REG_OFFSET,
38 .set = base_addr + OUTPUT_REG_OFFSET,
39 .dirout = base_addr + DIRECTION_REG_OFFSET,
40 };
41
42 retval = gpio_generic_chip_init(chip, &config);
43 if (retval)
44 return dev_err_probe(dev, retval,
45 "failed to initialize the generic GPIO chip\n");
46
47 return devm_gpiochip_add_data(dev, &chip->gc, NULL);
48}
49
50static const struct of_device_id ts4800_gpio_of_match[] = {
51 { .compatible = "technologic,ts4800-gpio", },
52 {},
53};
54MODULE_DEVICE_TABLE(of, ts4800_gpio_of_match);
55
56static struct platform_driver ts4800_gpio_driver = {
57 .driver = {
58 .name = "ts4800-gpio",
59 .of_match_table = ts4800_gpio_of_match,
60 },
61 .probe = ts4800_gpio_probe,
62};
63
64module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);
65
66MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");
67MODULE_DESCRIPTION("TS4800 FPGA GPIO driver");
68MODULE_LICENSE("GPL v2");