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// SPDX-License-Identifier: GPL-2.0-only /* * GPIO driver for the TS-4800 board * * Copyright (c) 2016 - Savoir-faire Linux */ #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"); |