101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*
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* CLPS711X GPIO driver
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*
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* Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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static int clps711x_gpio_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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void __iomem *dat, *dir;
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struct gpio_chip *gc;
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struct resource *res;
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int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
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if ((id < 0) || (id > 4))
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return -ENODEV;
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gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
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if (!gc)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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dat = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(dat))
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return PTR_ERR(dat);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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dir = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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switch (id) {
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case 3:
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/* PORTD is inverted logic for direction register */
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err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
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NULL, dir, 0);
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break;
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default:
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err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
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dir, NULL, 0);
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break;
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}
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if (err)
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return err;
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switch (id) {
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case 4:
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/* PORTE is 3 lines only */
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gc->ngpio = 3;
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break;
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default:
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break;
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}
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gc->base = id * 8;
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gc->owner = THIS_MODULE;
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platform_set_drvdata(pdev, gc);
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return gpiochip_add_data(gc, NULL);
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}
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static int clps711x_gpio_remove(struct platform_device *pdev)
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{
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struct gpio_chip *gc = platform_get_drvdata(pdev);
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gpiochip_remove(gc);
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return 0;
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}
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static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
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{ .compatible = "cirrus,clps711x-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
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static struct platform_driver clps711x_gpio_driver = {
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.driver = {
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.name = "clps711x-gpio",
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.of_match_table = of_match_ptr(clps711x_gpio_ids),
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},
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.probe = clps711x_gpio_probe,
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.remove = clps711x_gpio_remove,
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};
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module_platform_driver(clps711x_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("CLPS711X GPIO driver");
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MODULE_ALIAS("platform:clps711x-gpio");
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