diff options
| author | Hauke Mehrtens <hauke@hauke-m.de> | 2013-09-18 13:31:15 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-10-29 21:24:05 +0100 |
| commit | 62cf3bc0b59cfb70a021784af914c6ea464d3af7 (patch) | |
| tree | 2936407b84050a2c42f3ad4a99f182b3c1a56d05 /arch | |
| parent | 84e8bb5e9284b6833f303947a6966e87f406574a (diff) | |
| download | lwn-62cf3bc0b59cfb70a021784af914c6ea464d3af7.tar.gz lwn-62cf3bc0b59cfb70a021784af914c6ea464d3af7.zip | |
MIPS: BCM47XX: Get GPIO pin from nvram configuration
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/bcm47xx/nvram.c | 20 | ||||
| -rw-r--r-- | arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h | 2 |
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c index cc40b74940f5..b4c585b1c62e 100644 --- a/arch/mips/bcm47xx/nvram.c +++ b/arch/mips/bcm47xx/nvram.c @@ -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); diff --git a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h index b8e7be8f34dd..36a3fc1aa3ae 100644 --- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h +++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h @@ -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 */ |