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authorHauke Mehrtens <hauke@hauke-m.de>2013-09-18 13:31:15 +0200
committerRalf Baechle <ralf@linux-mips.org>2013-10-29 21:24:05 +0100
commit62cf3bc0b59cfb70a021784af914c6ea464d3af7 (patch)
tree2936407b84050a2c42f3ad4a99f182b3c1a56d05 /arch/mips/bcm47xx
parent84e8bb5e9284b6833f303947a6966e87f406574a (diff)
downloadop-kernel-dev-62cf3bc0b59cfb70a021784af914c6ea464d3af7.zip
op-kernel-dev-62cf3bc0b59cfb70a021784af914c6ea464d3af7.tar.gz
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/mips/bcm47xx')
-rw-r--r--arch/mips/bcm47xx/nvram.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index cc40b74..b4c585b 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);
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