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MIPS: BCM47XX: Get GPIO pin from nvram configuration

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The nvram contains some gpio configuration for boards. It is stored in
a gpio<number>=name format e.g.
gpio8=wps_button
gpio4=robo_reset

This patches adds a function to parse these entries, so other driver
can use it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5841/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Hauke Mehrtens 2013-09-18 13:31:15 +02:00 committed by Ralf Baechle
parent 84e8bb5e92
commit 62cf3bc0b5
2 changed files with 22 additions and 0 deletions
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20
arch/mips/bcm47xx/nvram.c
View File

@ -190,3 +190,23 @@ int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len)
return -ENOENT;
}
EXPORT_SYMBOL(bcm47xx_nvram_getenv);
int bcm47xx_nvram_gpio_pin(const char *name)
{
int i, err;
char nvram_var[10];
char buf[30];
for (i = 0; i < 16; i++) {
err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
if (err <= 0)
continue;
err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
if (err <= 0)
continue;
if (!strcmp(name, buf))
return i;
}
return -ENOENT;
}
EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);

2
arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
View File

@ -48,4 +48,6 @@ static inline void bcm47xx_nvram_parse_macaddr(char *buf, u8 macaddr[6])
printk(KERN_WARNING "Can not parse mac address: %s\n", buf);
}
int bcm47xx_nvram_gpio_pin(const char *name);
#endif /* __BCM47XX_NVRAM_H */