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[PATCH] chardev: GPIO for SCx200 & PC-8736x: add 'v' command to device-file

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Add a new driver command: 'v' which calls gpio_dump() on the pin.  The output
goes to the log, like all other INFO messages in the original driver.  Giving
the user control over the feedback they 'need' is construed to be a
user-friendly feature, and allows us (later) to dial down many INFO messages
to DEBUG log-level.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jim Cromie 2006-06-27 02:54:16 -07:00 committed by Linus Torvalds
parent d424aa8744
commit 9550a339e1
2 changed files with 17 additions and 2 deletions
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3
arch/i386/kernel/scx200.c
View file

@ -105,7 +105,6 @@ u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
return config;
}
#if 0
void scx200_gpio_dump(unsigned index)
{
u32 config = scx200_gpio_configure(index, ~0, 0);
@ -120,7 +119,6 @@ void scx200_gpio_dump(unsigned index)
(config & 32) ? "HI" : "LO", /* trigger on rising/falling edge */
(config & 64) ? "DEBOUNCE" : ""); /* debounce */
}
#endif /* 0 */
static int __init scx200_init(void)
{
@ -141,4 +139,5 @@ module_exit(scx200_cleanup);
EXPORT_SYMBOL(scx200_gpio_base);
EXPORT_SYMBOL(scx200_gpio_shadow);
EXPORT_SYMBOL(scx200_gpio_configure);
EXPORT_SYMBOL(scx200_gpio_dump);
EXPORT_SYMBOL(scx200_cb_base);

16
drivers/char/scx200_gpio.c
View file

@ -41,6 +41,7 @@ static ssize_t scx200_gpio_write(struct file *file, const char __user *data,
{
unsigned m = iminor(file->f_dentry->d_inode);
size_t i;
int err = 0;
for (i = 0; i < len; ++i) {
char c;
@ -77,8 +78,23 @@ static ssize_t scx200_gpio_write(struct file *file, const char __user *data,
printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
scx200_gpio_configure(m, ~4, 0);
break;
case 'v':
/* View Current pin settings */
scx200_gpio_dump(m);
break;
case '\n':
/* end of settings string, do nothing */
break;
default:
printk(KERN_ERR NAME
": GPIO-%2d bad setting: chr<0x%2x>\n", m,
(int)c);
err++;
}
}
if (err)
return -EINVAL; /* full string handled, report error */
return len;
}