tools: gpioset: add support for drive flags

Add support for drive flags to gpioset so that line drive flags
(open-drain,open-source) can be set from the command line.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/tools/gpioset.c b/tools/gpioset.c
index 347fb2e467baac71d7a87ad2de9e11553122f348..610ff75b58a23b37b6f501c13c75c62803526105 100644 (file)
--- a/tools/gpioset.c
+++ b/tools/gpioset.c
@@ -24,6 +24,7 @@ static const struct option longopts[] = {
        { "version",            no_argument,            NULL,   'v' },
        { "active-low",         no_argument,            NULL,   'l' },
        { "bias",               required_argument,      NULL,   'B' },
+       { "drive",              required_argument,      NULL,   'D' },
        { "mode",               required_argument,      NULL,   'm' },
        { "sec",                required_argument,      NULL,   's' },
        { "usec",               required_argument,      NULL,   'u' },
@@ -31,7 +32,7 @@ static const struct option longopts[] = {
        { GETOPT_NULL_LONGOPT },
 };
 
-static const char *const shortopts = "+hvlB:m:s:u:b";
+static const char *const shortopts = "+hvlB:D:m:s:u:b";
 
 static void print_help(void)
 {
@@ -45,6 +46,8 @@ static void print_help(void)
        printf("  -l, --active-low:\tset the line active state to low\n");
        printf("  -B, --bias=[as-is|disable|pull-down|pull-up] (defaults to 'as-is'):\n");
        printf("                set the line bias\n");
+       printf("  -D, --drive=[push-pull|open-drain|open-source] (defaults to 'push-pull'):\n");
+       printf("                set the line drive mode\n");
        printf("  -m, --mode=[exit|wait|time|signal] (defaults to 'exit'):\n");
        printf("                tell the program what to do after setting values\n");
        printf("  -s, --sec=SEC:\tspecify the number of seconds to wait (only valid for --mode=time)\n");
@@ -53,6 +56,11 @@ static void print_help(void)
        printf("\n");
        print_bias_help();
        printf("\n");
+       printf("Drives:\n");
+       printf("  push-pull:\tdrive the line both high and low\n");
+       printf("  open-drain:\tdrive the line low or go high impedance\n");
+       printf("  open-source:\tdrive the line high or go high impedance\n");
+       printf("\n");
        printf("Modes:\n");
        printf("  exit:\t\tset values and exit immediately\n");
        printf("  wait:\t\tset values and wait for user to press ENTER\n");
@@ -183,6 +191,17 @@ static const struct mode_mapping *parse_mode(const char *mode)
        return NULL;
 }
 
+static int drive_flags(const char *option)
+{
+       if (strcmp(option, "open-drain") == 0)
+               return GPIOD_CTXLESS_FLAG_OPEN_DRAIN;
+       if (strcmp(option, "open-source") == 0)
+               return GPIOD_CTXLESS_FLAG_OPEN_SOURCE;
+       if (strcmp(option, "push-pull") != 0)
+               die("invalid drive: %s", option);
+       return 0;
+}
+
 int main(int argc, char **argv)
 {
        const struct mode_mapping *mode = &modes[MODE_EXIT];
@@ -212,6 +231,9 @@ int main(int argc, char **argv)
                case 'B':
                        flags |= bias_flags(optarg);
                        break;
+               case 'D':
+                       flags |= drive_flags(optarg);
+                       break;
                case 'm':
                        mode = parse_mode(optarg);
                        if (!mode)