From: Jim Cromie 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 Signed-off-by: Andrew Morton --- drivers/char/nsc_gpio.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff -puN drivers/char/nsc_gpio.c~chardev-gpio-for-scx200-pc-8736x-display-pin drivers/char/nsc_gpio.c --- a/drivers/char/nsc_gpio.c~chardev-gpio-for-scx200-pc-8736x-display-pin +++ a/drivers/char/nsc_gpio.c @@ -26,7 +26,7 @@ void nsc_gpio_dump(struct nsc_gpio_ops * 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 * (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, _