Hello Sanjay,
One point - should powerdebug unexport these free gpios when it exits?
Otherwise, all the entries will remain in /sys/class/gpio/* and
/sys/kernel/debug/gpio file until next reboot which user may not want.
--
Thanks,
- Meraj
On Mon, Jun 2, 2014 at 2:46 PM, Sanjay Singh Rawat <sanjay.ra...@linaro.org>
wrote:
> - GPIOs in the SoC will be free/used state, this patch make free gpios
> accessible to the user by exporting them.
> - bug 1229658
>
> Signed-off-by: Sanjay Singh Rawat <sanjay.ra...@linaro.org>
> ---
> gpio.c | 27 +++++++++++++++------------
> 1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/gpio.c b/gpio.c
> index 4a42cb7..39480b0 100644
> --- a/gpio.c
> +++ b/gpio.c
> @@ -320,10 +320,10 @@ static struct display_ops gpio_ops = {
> .change = gpio_change,
> };
>
> -void export_gpios(void)
> +void export_free_gpios(void)
> {
> FILE *fgpio, *fgpio_export;
> - int gpio[256], num = 0;
> + int i, gpio_max = 0;
> char *line = NULL;
> ssize_t read, len;
>
> @@ -340,15 +340,18 @@ void export_gpios(void)
> }
>
> /* export the gpios */
> - while (read = getline(&line, &len, fgpio) != -1) {
> - char *str;
> -
> - if (strstr(line, "gpio-")) {
> - str = strtok(line, " ");
> - sscanf(str, "gpio-%d", &gpio[num]);
> - fprintf(fgpio_export, "%d", gpio[num]);
> - num++;
> - }
> + while ((read = getline(&line, &len, fgpio)) != -1) {
> + if (strstr(line, "GPIOs"))
> + sscanf(line, "%*[^-]-%d%*", &gpio_max);
> + }
> +
> + printf("log: total gpios = %d\n", gpio_max);
> + for (i = 0 ; i <= gpio_max ; i++) {
> + char command[50] = "";
> +
> + sprintf(command, "echo %d > /sys/class/gpio/export", i);
> + if (system(command) < 0)
> + printf("error: failed to export gpio-%d\n", i);
> }
> out:
> return;
> @@ -368,7 +371,7 @@ int gpio_init(void)
> if (access(SYSFS_GPIO, F_OK))
> gpio_error = true; /* set the flag */
>
> - export_gpios();
> + export_free_gpios();
>
> gpio_tree = tree_load(SYSFS_GPIO, gpio_filter_cb, false);
> if (!gpio_tree)
> --
> 1.7.10.4
>
>
> _______________________________________________
> linaro-dev mailing list
> linaro-dev@lists.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-dev
>
_______________________________________________
linaro-dev mailing list
linaro-dev@lists.linaro.org
http://lists.linaro.org/mailman/listinfo/linaro-dev
