18c2ecf20Sopenharmony_ci/*
28c2ecf20Sopenharmony_ci * GPIO driver for the TS-4800 board
38c2ecf20Sopenharmony_ci *
48c2ecf20Sopenharmony_ci * Copyright (c) 2016 - Savoir-faire Linux
58c2ecf20Sopenharmony_ci *
68c2ecf20Sopenharmony_ci * This file is licensed under the terms of the GNU General Public
78c2ecf20Sopenharmony_ci * License version 2. This program is licensed "as is" without any
88c2ecf20Sopenharmony_ci * warranty of any kind, whether express or implied.
98c2ecf20Sopenharmony_ci */
108c2ecf20Sopenharmony_ci
118c2ecf20Sopenharmony_ci#include <linux/gpio/driver.h>
128c2ecf20Sopenharmony_ci#include <linux/module.h>
138c2ecf20Sopenharmony_ci#include <linux/of_address.h>
148c2ecf20Sopenharmony_ci#include <linux/of_device.h>
158c2ecf20Sopenharmony_ci#include <linux/platform_device.h>
168c2ecf20Sopenharmony_ci
178c2ecf20Sopenharmony_ci#define DEFAULT_PIN_NUMBER      16
188c2ecf20Sopenharmony_ci#define INPUT_REG_OFFSET        0x00
198c2ecf20Sopenharmony_ci#define OUTPUT_REG_OFFSET       0x02
208c2ecf20Sopenharmony_ci#define DIRECTION_REG_OFFSET    0x04
218c2ecf20Sopenharmony_ci
228c2ecf20Sopenharmony_cistatic int ts4800_gpio_probe(struct platform_device *pdev)
238c2ecf20Sopenharmony_ci{
248c2ecf20Sopenharmony_ci	struct device_node *node;
258c2ecf20Sopenharmony_ci	struct gpio_chip *chip;
268c2ecf20Sopenharmony_ci	void __iomem *base_addr;
278c2ecf20Sopenharmony_ci	int retval;
288c2ecf20Sopenharmony_ci	u32 ngpios;
298c2ecf20Sopenharmony_ci
308c2ecf20Sopenharmony_ci	chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL);
318c2ecf20Sopenharmony_ci	if (!chip)
328c2ecf20Sopenharmony_ci		return -ENOMEM;
338c2ecf20Sopenharmony_ci
348c2ecf20Sopenharmony_ci	base_addr = devm_platform_ioremap_resource(pdev, 0);
358c2ecf20Sopenharmony_ci	if (IS_ERR(base_addr))
368c2ecf20Sopenharmony_ci		return PTR_ERR(base_addr);
378c2ecf20Sopenharmony_ci
388c2ecf20Sopenharmony_ci	node = pdev->dev.of_node;
398c2ecf20Sopenharmony_ci	if (!node)
408c2ecf20Sopenharmony_ci		return -EINVAL;
418c2ecf20Sopenharmony_ci
428c2ecf20Sopenharmony_ci	retval = of_property_read_u32(node, "ngpios", &ngpios);
438c2ecf20Sopenharmony_ci	if (retval == -EINVAL)
448c2ecf20Sopenharmony_ci		ngpios = DEFAULT_PIN_NUMBER;
458c2ecf20Sopenharmony_ci	else if (retval)
468c2ecf20Sopenharmony_ci		return retval;
478c2ecf20Sopenharmony_ci
488c2ecf20Sopenharmony_ci	retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET,
498c2ecf20Sopenharmony_ci			    base_addr + OUTPUT_REG_OFFSET, NULL,
508c2ecf20Sopenharmony_ci			    base_addr + DIRECTION_REG_OFFSET, NULL, 0);
518c2ecf20Sopenharmony_ci	if (retval) {
528c2ecf20Sopenharmony_ci		dev_err(&pdev->dev, "bgpio_init failed\n");
538c2ecf20Sopenharmony_ci		return retval;
548c2ecf20Sopenharmony_ci	}
558c2ecf20Sopenharmony_ci
568c2ecf20Sopenharmony_ci	chip->ngpio = ngpios;
578c2ecf20Sopenharmony_ci
588c2ecf20Sopenharmony_ci	platform_set_drvdata(pdev, chip);
598c2ecf20Sopenharmony_ci
608c2ecf20Sopenharmony_ci	return devm_gpiochip_add_data(&pdev->dev, chip, NULL);
618c2ecf20Sopenharmony_ci}
628c2ecf20Sopenharmony_ci
638c2ecf20Sopenharmony_cistatic const struct of_device_id ts4800_gpio_of_match[] = {
648c2ecf20Sopenharmony_ci	{ .compatible = "technologic,ts4800-gpio", },
658c2ecf20Sopenharmony_ci	{},
668c2ecf20Sopenharmony_ci};
678c2ecf20Sopenharmony_ciMODULE_DEVICE_TABLE(of, ts4800_gpio_of_match);
688c2ecf20Sopenharmony_ci
698c2ecf20Sopenharmony_cistatic struct platform_driver ts4800_gpio_driver = {
708c2ecf20Sopenharmony_ci	.driver = {
718c2ecf20Sopenharmony_ci		   .name = "ts4800-gpio",
728c2ecf20Sopenharmony_ci		   .of_match_table = ts4800_gpio_of_match,
738c2ecf20Sopenharmony_ci		   },
748c2ecf20Sopenharmony_ci	.probe = ts4800_gpio_probe,
758c2ecf20Sopenharmony_ci};
768c2ecf20Sopenharmony_ci
778c2ecf20Sopenharmony_cimodule_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);
788c2ecf20Sopenharmony_ci
798c2ecf20Sopenharmony_ciMODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");
808c2ecf20Sopenharmony_ciMODULE_DESCRIPTION("TS4800 FPGA GPIO driver");
818c2ecf20Sopenharmony_ciMODULE_LICENSE("GPL v2");
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