diff options
| author | Jim Cromie <jim.cromie@gmail.com> | 2006-06-27 02:54:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:42 -0700 |
| commit | 9550a339e1ab1709dd53d92a1b76eecae2df9f3c (patch) | |
| tree | a5bea006ebb482c6f4468816486254c401803282 /drivers/char/scx200_gpio.c | |
| parent | d424aa8744b7b7db1d32476ae6c8015d10eebe1c (diff) | |
| download | linux-9550a339e1ab1709dd53d92a1b76eecae2df9f3c.tar.bz2 | |
[PATCH] chardev: GPIO for SCx200 & PC-8736x: add 'v' command to device-file
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>
Diffstat (limited to 'drivers/char/scx200_gpio.c')
| -rw-r--r-- | drivers/char/scx200_gpio.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/char/scx200_gpio.c b/drivers/char/scx200_gpio.c index e6e52c48697b..a1a56c5c8a84 100644 --- a/drivers/char/scx200_gpio.c +++ b/drivers/char/scx200_gpio.c @@ -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; } |