linux-mips
[Top] [All Lists]

[PATCH] MIPS: BCM47XX: get GPIO pin from nvram configuration

To: ralf@linux-mips.org
Subject: [PATCH] MIPS: BCM47XX: get GPIO pin from nvram configuration
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Wed, 18 Sep 2013 13:31:15 +0200
Cc: linux-mips@linux-mips.org, Hauke Mehrtens <hauke@hauke-m.de>
List-archive: <http://www.linux-mips.org/archives/linux-mips/>
List-help: <mailto:ecartis@linux-mips.org?Subject=help>
List-id: linux-mips <linux-mips.eddie.linux-mips.org>
List-owner: <mailto:ralf@linux-mips.org>
List-post: <mailto:linux-mips@linux-mips.org>
List-software: Ecartis version 1.0.0
List-subscribe: <mailto:ecartis@linux-mips.org?subject=subscribe%20linux-mips>
List-unsubscribe: <mailto:ecartis@linux-mips.org?subject=unsubscribe%20linux-mips>
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
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>
---
 arch/mips/bcm47xx/nvram.c                          |   20 ++++++++++++++++++++
 arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h |    2 ++
 2 files changed, 22 insertions(+)

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);
diff --git a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h 
b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
index b8e7be8..36a3fc1 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 */
-- 
1.7.10.4


<Prev in Thread] Current Thread [Next in Thread>
  • [PATCH] MIPS: BCM47XX: get GPIO pin from nvram configuration, Hauke Mehrtens <=