mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
a7113a9662
Signed-off-by: Josef Sipek <jsipek@fsl.cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/* linux/drivers/char/nsc_gpio.c
|
|
|
|
National Semiconductor common GPIO device-file/VFS methods.
|
|
Allows a user space process to control the GPIO pins.
|
|
|
|
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
|
|
Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/nsc_gpio.h>
|
|
#include <linux/platform_device.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/io.h>
|
|
|
|
#define NAME "nsc_gpio"
|
|
|
|
void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index)
|
|
{
|
|
/* retrieve current config w/o changing it */
|
|
u32 config = amp->gpio_config(index, ~0, 0);
|
|
|
|
/* user requested via 'v' command, so its INFO */
|
|
dev_info(amp->dev, "io%02u: 0x%04x %s %s %s %s %s %s %s\tio:%d/%d\n",
|
|
index, config,
|
|
(config & 1) ? "OE" : "TS", /* output-enabled/tristate */
|
|
(config & 2) ? "PP" : "OD", /* push pull / open drain */
|
|
(config & 4) ? "PUE" : "PUD", /* pull up enabled/disabled */
|
|
(config & 8) ? "LOCKED" : "", /* locked / unlocked */
|
|
(config & 16) ? "LEVEL" : "EDGE",/* level/edge input */
|
|
(config & 32) ? "HI" : "LO", /* trigger on rise/fall edge */
|
|
(config & 64) ? "DEBOUNCE" : "", /* debounce */
|
|
|
|
amp->gpio_get(index), amp->gpio_current(index));
|
|
}
|
|
|
|
ssize_t nsc_gpio_write(struct file *file, const char __user *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
unsigned m = iminor(file->f_path.dentry->d_inode);
|
|
struct nsc_gpio_ops *amp = file->private_data;
|
|
struct device *dev = amp->dev;
|
|
size_t i;
|
|
int err = 0;
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
char c;
|
|
if (get_user(c, data + i))
|
|
return -EFAULT;
|
|
switch (c) {
|
|
case '0':
|
|
amp->gpio_set(m, 0);
|
|
break;
|
|
case '1':
|
|
amp->gpio_set(m, 1);
|
|
break;
|
|
case 'O':
|
|
dev_dbg(dev, "GPIO%d output enabled\n", m);
|
|
amp->gpio_config(m, ~1, 1);
|
|
break;
|
|
case 'o':
|
|
dev_dbg(dev, "GPIO%d output disabled\n", m);
|
|
amp->gpio_config(m, ~1, 0);
|
|
break;
|
|
case 'T':
|
|
dev_dbg(dev, "GPIO%d output is push pull\n", m);
|
|
amp->gpio_config(m, ~2, 2);
|
|
break;
|
|
case 't':
|
|
dev_dbg(dev, "GPIO%d output is open drain\n", m);
|
|
amp->gpio_config(m, ~2, 0);
|
|
break;
|
|
case 'P':
|
|
dev_dbg(dev, "GPIO%d pull up enabled\n", m);
|
|
amp->gpio_config(m, ~4, 4);
|
|
break;
|
|
case 'p':
|
|
dev_dbg(dev, "GPIO%d pull up disabled\n", m);
|
|
amp->gpio_config(m, ~4, 0);
|
|
break;
|
|
case 'v':
|
|
/* View Current pin settings */
|
|
amp->gpio_dump(amp, m);
|
|
break;
|
|
case '\n':
|
|
/* end of settings string, do nothing */
|
|
break;
|
|
default:
|
|
dev_err(dev, "io%2d bad setting: chr<0x%2x>\n",
|
|
m, (int)c);
|
|
err++;
|
|
}
|
|
}
|
|
if (err)
|
|
return -EINVAL; /* full string handled, report error */
|
|
|
|
return len;
|
|
}
|
|
|
|
ssize_t nsc_gpio_read(struct file *file, char __user * buf,
|
|
size_t len, loff_t * ppos)
|
|
{
|
|
unsigned m = iminor(file->f_path.dentry->d_inode);
|
|
int value;
|
|
struct nsc_gpio_ops *amp = file->private_data;
|
|
|
|
value = amp->gpio_get(m);
|
|
if (put_user(value ? '1' : '0', buf))
|
|
return -EFAULT;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* common file-ops routines for both scx200_gpio and pc87360_gpio */
|
|
EXPORT_SYMBOL(nsc_gpio_write);
|
|
EXPORT_SYMBOL(nsc_gpio_read);
|
|
EXPORT_SYMBOL(nsc_gpio_dump);
|
|
|
|
static int __init nsc_gpio_init(void)
|
|
{
|
|
printk(KERN_DEBUG NAME " initializing\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit nsc_gpio_cleanup(void)
|
|
{
|
|
printk(KERN_DEBUG NAME " cleanup\n");
|
|
}
|
|
|
|
module_init(nsc_gpio_init);
|
|
module_exit(nsc_gpio_cleanup);
|
|
|
|
MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
|
|
MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
|
|
MODULE_LICENSE("GPL");
|