| Marek Vasut | 4cf8e53 | 2009-09-22 16:46:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Philips UCB1400 GPIO driver |
| 3 | * |
| 4 | * Author: Marek Vasut <marek.vasut@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/ucb1400.h> |
| 14 | |
| 15 | struct ucb1400_gpio_data *ucbdata; |
| 16 | |
| 17 | static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off) |
| 18 | { |
| 19 | struct ucb1400_gpio *gpio; |
| 20 | gpio = container_of(gc, struct ucb1400_gpio, gc); |
| 21 | ucb1400_gpio_set_direction(gpio->ac97, off, 0); |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val) |
| 26 | { |
| 27 | struct ucb1400_gpio *gpio; |
| 28 | gpio = container_of(gc, struct ucb1400_gpio, gc); |
| 29 | ucb1400_gpio_set_direction(gpio->ac97, off, 1); |
| 30 | ucb1400_gpio_set_value(gpio->ac97, off, val); |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off) |
| 35 | { |
| 36 | struct ucb1400_gpio *gpio; |
| 37 | gpio = container_of(gc, struct ucb1400_gpio, gc); |
| 38 | return ucb1400_gpio_get_value(gpio->ac97, off); |
| 39 | } |
| 40 | |
| 41 | static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val) |
| 42 | { |
| 43 | struct ucb1400_gpio *gpio; |
| 44 | gpio = container_of(gc, struct ucb1400_gpio, gc); |
| 45 | ucb1400_gpio_set_value(gpio->ac97, off, val); |
| 46 | } |
| 47 | |
| 48 | static int ucb1400_gpio_probe(struct platform_device *dev) |
| 49 | { |
| 50 | struct ucb1400_gpio *ucb = dev->dev.platform_data; |
| 51 | int err = 0; |
| 52 | |
| 53 | if (!(ucbdata && ucbdata->gpio_offset)) { |
| 54 | err = -EINVAL; |
| 55 | goto err; |
| 56 | } |
| 57 | |
| 58 | platform_set_drvdata(dev, ucb); |
| 59 | |
| 60 | ucb->gc.label = "ucb1400_gpio"; |
| 61 | ucb->gc.base = ucbdata->gpio_offset; |
| 62 | ucb->gc.ngpio = 10; |
| 63 | ucb->gc.owner = THIS_MODULE; |
| 64 | |
| 65 | ucb->gc.direction_input = ucb1400_gpio_dir_in; |
| 66 | ucb->gc.direction_output = ucb1400_gpio_dir_out; |
| 67 | ucb->gc.get = ucb1400_gpio_get; |
| 68 | ucb->gc.set = ucb1400_gpio_set; |
| 69 | ucb->gc.can_sleep = 1; |
| 70 | |
| 71 | err = gpiochip_add(&ucb->gc); |
| 72 | if (err) |
| 73 | goto err; |
| 74 | |
| 75 | if (ucbdata && ucbdata->gpio_setup) |
| 76 | err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio); |
| 77 | |
| 78 | err: |
| 79 | return err; |
| 80 | |
| 81 | } |
| 82 | |
| 83 | static int ucb1400_gpio_remove(struct platform_device *dev) |
| 84 | { |
| 85 | int err = 0; |
| 86 | struct ucb1400_gpio *ucb = platform_get_drvdata(dev); |
| 87 | |
| 88 | if (ucbdata && ucbdata->gpio_teardown) { |
| 89 | err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio); |
| 90 | if (err) |
| 91 | return err; |
| 92 | } |
| 93 | |
| 94 | err = gpiochip_remove(&ucb->gc); |
| 95 | return err; |
| 96 | } |
| 97 | |
| 98 | static struct platform_driver ucb1400_gpio_driver = { |
| 99 | .probe = ucb1400_gpio_probe, |
| 100 | .remove = ucb1400_gpio_remove, |
| 101 | .driver = { |
| 102 | .name = "ucb1400_gpio" |
| 103 | }, |
| 104 | }; |
| 105 | |
| 106 | static int __init ucb1400_gpio_init(void) |
| 107 | { |
| 108 | return platform_driver_register(&ucb1400_gpio_driver); |
| 109 | } |
| 110 | |
| 111 | static void __exit ucb1400_gpio_exit(void) |
| 112 | { |
| 113 | platform_driver_unregister(&ucb1400_gpio_driver); |
| 114 | } |
| 115 | |
| 116 | void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data) |
| 117 | { |
| 118 | ucbdata = data; |
| 119 | } |
| 120 | |
| 121 | module_init(ucb1400_gpio_init); |
| 122 | module_exit(ucb1400_gpio_exit); |
| 123 | |
| 124 | MODULE_DESCRIPTION("Philips UCB1400 GPIO driver"); |
| 125 | MODULE_LICENSE("GPL"); |