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160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/*
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* GPIO char driver
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*
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* Copyright 2005, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* $Id$
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <asm/uaccess.h>
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#include <typedefs.h>
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#include <osl.h>
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#include <bcmutils.h>
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#include <sbutils.h>
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#include <bcmdevs.h>
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static sb_t *gpio_sbh;
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static int gpio_major;
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static devfs_handle_t gpio_dir;
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static struct {
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char *name;
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devfs_handle_t handle;
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} gpio_file[] = {
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{ "in", NULL },
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{ "out", NULL },
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{ "outen", NULL },
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{ "control", NULL }
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};
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static int
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gpio_open(struct inode *inode, struct file * file)
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{
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if (MINOR(inode->i_rdev) > ARRAYSIZE(gpio_file))
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return -ENODEV;
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MOD_INC_USE_COUNT;
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return 0;
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}
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static int
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gpio_release(struct inode *inode, struct file * file)
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{
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MOD_DEC_USE_COUNT;
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return 0;
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}
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static ssize_t
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gpio_read(struct file *file, char *buf, size_t count, loff_t *ppos)
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{
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u32 val;
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switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
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case 0:
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val = sb_gpioin(gpio_sbh);
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break;
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case 1:
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val = sb_gpioout(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
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break;
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case 2:
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val = sb_gpioouten(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
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break;
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case 3:
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val = sb_gpiocontrol(gpio_sbh, 0, 0, GPIO_DRV_PRIORITY);
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break;
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default:
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return -ENODEV;
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}
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if (put_user(val, (u32 *) buf))
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return -EFAULT;
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return sizeof(val);
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}
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static ssize_t
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gpio_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
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{
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u32 val;
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if (get_user(val, (u32 *) buf))
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return -EFAULT;
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switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
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case 0:
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return -EACCES;
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case 1:
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sb_gpioout(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
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break;
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case 2:
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sb_gpioouten(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
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break;
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case 3:
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sb_gpiocontrol(gpio_sbh, ~0, val, GPIO_DRV_PRIORITY);
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break;
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default:
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return -ENODEV;
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}
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return sizeof(val);
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}
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static struct file_operations gpio_fops = {
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owner: THIS_MODULE,
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open: gpio_open,
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release: gpio_release,
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read: gpio_read,
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write: gpio_write,
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};
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static int __init
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gpio_init(void)
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{
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int i;
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if (!(gpio_sbh = sb_kattach()))
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return -ENODEV;
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sb_gpiosetcore(gpio_sbh);
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if ((gpio_major = devfs_register_chrdev(0, "gpio", &gpio_fops)) < 0)
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return gpio_major;
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gpio_dir = devfs_mk_dir(NULL, "gpio", NULL);
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for (i = 0; i < ARRAYSIZE(gpio_file); i++) {
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gpio_file[i].handle = devfs_register(gpio_dir,
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gpio_file[i].name,
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DEVFS_FL_DEFAULT, gpio_major, i,
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S_IFCHR | S_IRUGO | S_IWUGO,
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&gpio_fops, NULL);
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}
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return 0;
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}
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static void __exit
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gpio_exit(void)
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{
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int i;
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for (i = 0; i < ARRAYSIZE(gpio_file); i++)
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devfs_unregister(gpio_file[i].handle);
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devfs_unregister(gpio_dir);
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devfs_unregister_chrdev(gpio_major, "gpio");
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sb_detach(gpio_sbh);
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}
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module_init(gpio_init);
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module_exit(gpio_exit);
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