126 строки
2.8 KiB
C
126 строки
2.8 KiB
C
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/*
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* Philips UCB1400 GPIO driver
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*
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* Author: Marek Vasut <marek.vasut@gmail.com>
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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 version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/ucb1400.h>
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struct ucb1400_gpio_data *ucbdata;
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static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
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{
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struct ucb1400_gpio *gpio;
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gpio = container_of(gc, struct ucb1400_gpio, gc);
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ucb1400_gpio_set_direction(gpio->ac97, off, 0);
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return 0;
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}
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static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
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{
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struct ucb1400_gpio *gpio;
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gpio = container_of(gc, struct ucb1400_gpio, gc);
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ucb1400_gpio_set_direction(gpio->ac97, off, 1);
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ucb1400_gpio_set_value(gpio->ac97, off, val);
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return 0;
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}
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static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
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{
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struct ucb1400_gpio *gpio;
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gpio = container_of(gc, struct ucb1400_gpio, gc);
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return ucb1400_gpio_get_value(gpio->ac97, off);
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}
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static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
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{
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struct ucb1400_gpio *gpio;
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gpio = container_of(gc, struct ucb1400_gpio, gc);
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ucb1400_gpio_set_value(gpio->ac97, off, val);
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}
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static int ucb1400_gpio_probe(struct platform_device *dev)
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{
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struct ucb1400_gpio *ucb = dev->dev.platform_data;
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int err = 0;
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if (!(ucbdata && ucbdata->gpio_offset)) {
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err = -EINVAL;
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goto err;
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}
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platform_set_drvdata(dev, ucb);
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ucb->gc.label = "ucb1400_gpio";
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ucb->gc.base = ucbdata->gpio_offset;
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ucb->gc.ngpio = 10;
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ucb->gc.owner = THIS_MODULE;
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ucb->gc.direction_input = ucb1400_gpio_dir_in;
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ucb->gc.direction_output = ucb1400_gpio_dir_out;
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ucb->gc.get = ucb1400_gpio_get;
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ucb->gc.set = ucb1400_gpio_set;
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ucb->gc.can_sleep = 1;
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err = gpiochip_add(&ucb->gc);
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if (err)
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goto err;
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if (ucbdata && ucbdata->gpio_setup)
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err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);
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err:
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return err;
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}
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static int ucb1400_gpio_remove(struct platform_device *dev)
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{
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int err = 0;
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struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
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if (ucbdata && ucbdata->gpio_teardown) {
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err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
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if (err)
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return err;
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}
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err = gpiochip_remove(&ucb->gc);
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return err;
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}
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static struct platform_driver ucb1400_gpio_driver = {
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.probe = ucb1400_gpio_probe,
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.remove = ucb1400_gpio_remove,
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.driver = {
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.name = "ucb1400_gpio"
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},
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};
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static int __init ucb1400_gpio_init(void)
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{
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return platform_driver_register(&ucb1400_gpio_driver);
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}
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static void __exit ucb1400_gpio_exit(void)
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{
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platform_driver_unregister(&ucb1400_gpio_driver);
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}
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void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
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{
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ucbdata = data;
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}
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module_init(ucb1400_gpio_init);
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module_exit(ucb1400_gpio_exit);
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MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
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MODULE_LICENSE("GPL");
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