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54 lines
1.5 KiB
54 lines
1.5 KiB
commit e49ec29e2da1fd7cdd6d966f389add031a1027a9
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Author: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Wed Sep 18 13:31:15 2013 +0200
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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
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a gpio<number>=name format e.g.
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gpio8=wps_button
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gpio4=robo_reset
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This patches adds a function to parse these entries, so other driver
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can use it.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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Cc: linux-mips@linux-mips.org
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Patchwork: https://patchwork.linux-mips.org/patch/5841/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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--- a/arch/mips/bcm47xx/nvram.c
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+++ b/arch/mips/bcm47xx/nvram.c
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@@ -190,3 +190,23 @@ int bcm47xx_nvram_getenv(char *name, cha
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return -ENOENT;
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}
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EXPORT_SYMBOL(bcm47xx_nvram_getenv);
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+
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+int bcm47xx_nvram_gpio_pin(const char *name)
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+{
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+ int i, err;
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+ char nvram_var[10];
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+ char buf[30];
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+
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+ for (i = 0; i < 16; i++) {
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+ err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
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+ if (err <= 0)
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+ continue;
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+ err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
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+ if (err <= 0)
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+ continue;
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+ if (!strcmp(name, buf))
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+ return i;
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+ }
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+ return -ENOENT;
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+}
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+EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
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--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
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+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
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@@ -48,4 +48,6 @@ static inline void bcm47xx_nvram_parse_m
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printk(KERN_WARNING "Can not parse mac address: %s\n", buf);
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}
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+int bcm47xx_nvram_gpio_pin(const char *name);
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+
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#endif /* __BCM47XX_NVRAM_H */
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