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| author | Rong Chang <rongchang@chromium.org> | 2012-07-02 17:24:32 +0800 |
|---|---|---|
| committer | Gerrit <chrome-bot@google.com> | 2012-07-03 07:21:34 -0700 |
| commit | a5ef4f98fc30cfae232295464fbc9d846c980fdf (patch) | |
| tree | a0f3fd29f15ed507bb9b4a1809ddf4a74f63725a | |
| parent | 7ec59576f6f61effdc35482c8cfd4aa32b643b1a (diff) | |
| download | vboot-a5ef4f98fc30cfae232295464fbc9d846c980fdf.tar.gz | |
Exporting GPIO if the sysfs node does not exist
This change exports gpio number if it can not be accessed. Ignore
the active_low checking for compatibility.
Signed-off-by: Rong Chang <rongchang@chromium.org>
BUG=chrome-os-partner:11029
TEST=manual
Run crossystem and check WP pin status
Change-Id: I0885ab21c6c6d614945e4fda49a373e8619772a9
Reviewed-on: https://gerrit.chromium.org/gerrit/26563
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
| -rw-r--r-- | host/arch/arm/lib/crossystem_arch.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/host/arch/arm/lib/crossystem_arch.c b/host/arch/arm/lib/crossystem_arch.c index c3afccf7..1cb51c24 100644 --- a/host/arch/arm/lib/crossystem_arch.c +++ b/host/arch/arm/lib/crossystem_arch.c @@ -25,6 +25,9 @@ #define FDT_COMPATIBLE_PATH "/proc/device-tree/compatible" /* Device for NVCTX write */ #define NVCTX_PATH "/dev/mmcblk%d" +/* Base name for GPIO files */ +#define GPIO_BASE_PATH "/sys/class/gpio" +#define GPIO_EXPORT_PATH GPIO_BASE_PATH "/export" /* Errors */ #define E_FAIL -1 #define E_FILEOP -2 @@ -191,11 +194,26 @@ static char * ReadFdtPlatformFamily(void) { } static int VbGetGpioStatus(unsigned gpio_number) { - char const *gpio_name_format = "/sys/class/gpio/gpio%d/value"; char gpio_name[FNAME_SIZE]; + int value; + + snprintf(gpio_name, sizeof(gpio_name), "%s/gpio%d/value", + GPIO_BASE_PATH, gpio_number); + value = ReadFileInt(gpio_name); + + if (value == -1) { + /* Try exporting the GPIO */ + FILE* f = fopen(GPIO_EXPORT_PATH, "wt"); + if (!f) + return -1; + fprintf(f, "%d", gpio_number); + fclose(f); - snprintf(gpio_name, sizeof(gpio_name), gpio_name_format, gpio_number); - return ReadFileInt(gpio_name); + /* Try re-reading the GPIO value */ + value = ReadFileInt(gpio_name); + } + + return value; } static int VbGetVarGpio(const char* name) { |