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dm: gpio: Add gpio_requestf() helper for printf() strings

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Add a helper which permits a printf()-style format string for the requester
string.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2014-10-04 11:29:49 -06:00
parent 4b8f11c2cc
commit d44f597b12
4 changed files with 51 additions and 1 deletions
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21
drivers/gpio/gpio-uclass.c
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@@ -130,6 +130,27 @@ int gpio_request(unsigned gpio, const char *label)
return 0;
}
/**
* gpio_requestf() - [COMPAT] Request GPIO
* @gpio: GPIO number
* @fmt: Format string for the requested GPIO
* @...: Arguments for the printf() format string
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_requestf(unsigned gpio, const char *fmt, ...)
{
va_list args;
char buf[40];
va_start(args, fmt);
vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return gpio_request(gpio, buf);
}
/**
* gpio_free() - [COMPAT] Relinquish GPIO
* gpio: GPIO number