diff options
| author | Jim Cromie <jim.cromie@gmail.com> | 2006-06-27 02:54:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:43 -0700 |
| commit | 23916a8e3d8f41aa91474e834ac99808b197c39e (patch) | |
| tree | d5d08172500e1b7bca0317bf29f6dd917b034200 /drivers/char | |
| parent | ec312310e43acd5bb8b49314c6d472bb60d2d30c (diff) | |
[PATCH] chardev: GPIO for SCx200 & PC-8736x: display pin values in/out in gpio_dump
Add current pin settings to gpio_dump() output. This adds the last 'word' to
the syslog lines, which displays the input and output values that the pin is
set to.
pc8736x_gpio.0: io00: 0x0044 TS OD PUE EDGE LO DEBOUNCE io:1/1
The 2 values may differ for a number of reasons:
1- the pin output circuitry is diaabled, (as the above 'TS' indicates)
2- it needs a pullup resistor to drive the attached circuit,
3- the external circuit needs a pullup so the open-drain has something
to pull-down
4- the pin is wired to Vcc or Ground
It might be appropriate to add a WARN for 2,3,4, since they could
damage the chip and/or circuit, esp if misconfig goes unnoticed.
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')
| -rw-r--r-- | drivers/char/nsc_gpio.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/char/nsc_gpio.c b/drivers/char/nsc_gpio.c index d0b5d65a73f..5b91e4e2564 100644 --- a/drivers/char/nsc_gpio.c +++ b/drivers/char/nsc_gpio.c @@ -26,7 +26,7 @@ void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index) 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\n", + 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 */ @@ -34,7 +34,9 @@ void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index) (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 */ + (config & 64) ? "DEBOUNCE" : "", /* debounce */ + + amp->gpio_get(index), amp->gpio_current(index)); } ssize_t nsc_gpio_write(struct file *file, const char __user *data, |