On Monday 02 June 2014 02:52 PM, Mohammad Merajul Islam Molla wrote:
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.
I was thinking whether that is needed. But yes, i agree with you (that
will be more proper). Thanks for bringing it.
--
Thanks,
- Meraj
On Mon, Jun 2, 2014 at 2:46 PM, Sanjay Singh Rawat
<sanjay.ra...@linaro.org <mailto: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
<mailto: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
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--
sanjay
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