4 * Copyright 2004, Broadcom Corporation
7 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
8 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
9 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
10 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
15 #include <linux/module.h>
16 #include <linux/init.h>
18 #include <linux/miscdevice.h>
19 #include <asm/uaccess.h>
26 static void *gpio_sbh;
27 static int gpio_major;
28 static devfs_handle_t gpio_dir;
31 devfs_handle_t handle;
40 gpio_open(struct inode *inode, struct file * file)
42 if (MINOR(inode->i_rdev) > ARRAYSIZE(gpio_file))
50 gpio_release(struct inode *inode, struct file * file)
57 gpio_read(struct file *file, char *buf, size_t count, loff_t *ppos)
61 switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
63 val = sb_gpioin(gpio_sbh);
66 val = sb_gpioout(gpio_sbh, 0, 0);
69 val = sb_gpioouten(gpio_sbh, 0, 0);
72 val = sb_gpiocontrol(gpio_sbh, 0, 0);
78 if (put_user(val, (u32 *) buf))
85 gpio_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
89 if (get_user(val, (u32 *) buf))
92 switch (MINOR(file->f_dentry->d_inode->i_rdev)) {
96 sb_gpioout(gpio_sbh, ~0, val);
99 sb_gpioouten(gpio_sbh, ~0, val);
102 sb_gpiocontrol(gpio_sbh, ~0, val);
111 static struct file_operations gpio_fops = {
114 release: gpio_release,
124 if (!(gpio_sbh = sb_kattach()))
127 sb_gpiosetcore(gpio_sbh);
129 if ((gpio_major = devfs_register_chrdev(0, "gpio", &gpio_fops)) < 0)
132 gpio_dir = devfs_mk_dir(NULL, "gpio", NULL);
134 for (i = 0; i < ARRAYSIZE(gpio_file); i++) {
135 gpio_file[i].handle = devfs_register(gpio_dir,
137 DEVFS_FL_DEFAULT, gpio_major, i,
138 S_IFCHR | S_IRUGO | S_IWUGO,
150 for (i = 0; i < ARRAYSIZE(gpio_file); i++)
151 devfs_unregister(gpio_file[i].handle);
152 devfs_unregister(gpio_dir);
153 devfs_unregister_chrdev(gpio_major, "gpio");
157 module_init(gpio_init);
158 module_exit(gpio_exit);