Added power state control

diff --git a/alsactl/alsactl.c b/alsactl/alsactl.c
index 1bef4af..d126b98 100644 (file)
--- a/alsactl/alsactl.c
+++ b/alsactl/alsactl.c
@@ -61,6 +61,8 @@ static void help(void)
        printf("                  to configuration file\n");
        printf("  restore<card #> load current driver setup for one or each soundcards\n");
        printf("                  from configuration file\n");
+       printf("  power [card #] [state]\n");
+       printf("                  get/set power state for one or each soundcards\n");
 }
 
 char *id_str(snd_ctl_elem_id_t *id)
@@ -948,7 +950,7 @@ static int save_state(char *file, const char *cardname)
                        if (card < 0) {
                                if (first) {
                                        error("No soundcards found...");
-                                       return 1;
+                                       return EXIT_FAILURE;
                                }
                                break;
                        }
@@ -962,7 +964,7 @@ static int save_state(char *file, const char *cardname)
                cardno = snd_card_get_index(cardname);
                if (cardno < 0) {
                        error("Cannot find soundcard '%s'...", cardname);
-                       return 1;
+                       return EXIT_FAILURE;
                }
                if ((err = get_controls(cardno, config))) {
                        return err;
@@ -1022,7 +1024,7 @@ static int load_state(char *file, const char *cardname)
                        if (card < 0) {
                                if (first) {
                                        error("No soundcards found...");
-                                       return 1;
+                                       return EXIT_FAILURE;
                                }
                                break;
                        }
@@ -1036,7 +1038,7 @@ static int load_state(char *file, const char *cardname)
                cardno = snd_card_get_index(cardname);
                if (cardno < 0) {
                        error("Cannot find soundcard '%s'...", cardname);
-                       return 1;
+                       return EXIT_FAILURE;
                }
                if ((err = set_controls(cardno, config))) {
                        return err;
@@ -1045,6 +1047,169 @@ static int load_state(char *file, const char *cardname)
        return 0;
 }
 
+static int get_int_state(const char *str)
+{
+       if (*str == 'D' || *str == 'd') {
+               str++;
+               if (!strcmp(str, "0") || !strcmp(str, "on"))
+                       return SND_CTL_POWER_D0;
+               if (!strcmp(str, "1"))
+                       return SND_CTL_POWER_D1;
+               if (!strcmp(str, "2"))
+                       return SND_CTL_POWER_D2;
+               if (!strcmp(str, "3"))
+                       return SND_CTL_POWER_D3;
+               if (!strcmp(str, "3hot") || !strcmp(str, "off"))
+                       return SND_CTL_POWER_D3hot;
+               if (!strcmp(str, "3cold"))
+                       return SND_CTL_POWER_D3cold;
+       }
+       return -1;
+}
+
+static const char *get_str_state(int power_state)
+{
+       static char str[16];
+
+       switch (power_state) {
+       case SND_CTL_POWER_D0:
+               return "D0";
+       case SND_CTL_POWER_D1:
+               return "D1";
+       case SND_CTL_POWER_D2:
+               return "D2";
+       // return SND_CTL_POWER_D3;     /* it's same as D3hot */
+       case SND_CTL_POWER_D3hot:
+               return "D3hot";
+       case SND_CTL_POWER_D3cold:
+               return "D3cold";
+       default:
+               sprintf(str, "???0x%x", power_state);
+               return str;
+       }
+}
+
+static int show_power(int cardno)
+{
+       snd_ctl_t *handle;
+       char name[16];
+       int power_state, err;
+
+       sprintf(name, "hw:%d", cardno);
+       err = snd_ctl_open(&handle, name, 0);
+       if (err < 0) {
+               error("snd_ctl_open error: %s", snd_strerror(err));
+               return err;
+       }
+       err = snd_ctl_get_power_state(handle, &power_state);
+       if (err < 0) {
+               error("snd_ctl_get_power_state error: %s", snd_strerror(err));
+               snd_ctl_close(handle);
+               return err;
+       }
+       snd_ctl_close(handle);
+       printf("Power state for card #%d is %s\n", cardno, get_str_state(power_state));
+       return 0;
+}
+
+static int set_power(int cardno, int power_state)
+{
+       snd_ctl_t *handle;
+       char name[16];
+       int err;
+
+       sprintf(name, "hw:%d", cardno);
+       err = snd_ctl_open(&handle, name, 0);
+       if (err < 0) {
+               error("snd_ctl_open error: %s", snd_strerror(err));
+               return err;
+       }
+       err = snd_ctl_set_power_state(handle, power_state);
+       if (err < 0) {
+               error("snd_ctl_set_power_state error: %s", snd_strerror(err));
+               snd_ctl_close(handle);
+               return err;
+       }
+       err = snd_ctl_get_power_state(handle, &power_state);
+       if (err < 0) {
+               error("snd_ctl_get_power_state error: %s", snd_strerror(err));
+               snd_ctl_close(handle);
+               return err;
+       }
+       snd_ctl_close(handle);
+       printf("Power state for card #%d is %s\n", cardno, get_str_state(power_state));
+       return 0;
+}
+
+static int power(const char *argv[], int argc)
+{
+       int power_state, err;
+       
+       if (argc == 0) {                /* show status only */
+               int card, first = 1;
+
+               card = -1;
+               /* find each installed soundcards */
+               while (1) {
+                       if (snd_card_next(&card) < 0)
+                               break;
+                       if (card < 0) {
+                               if (first) {
+                                       error("No soundcards found...");
+                                       return EXIT_FAILURE;
+                               }
+                               break;
+                       }
+                       first = 0;
+                       if ((err = show_power(card)) < 0)
+                               return err;
+               }
+               return 0;
+       }
+       power_state = get_int_state(argv[0]);
+       if (power_state > 0) {
+               int card, first = 1;
+
+               card = -1;
+               /* find each installed soundcards */
+               while (1) {
+                       if (snd_card_next(&card) < 0)
+                               break;
+                       if (card < 0) {
+                               if (first) {
+                                       error("No soundcards found...");
+                                       return EXIT_FAILURE;
+                               }
+                               break;
+                       }
+                       first = 0;
+                       if ((err = set_power(card, power_state)))
+                               return err;
+               }
+       } else {
+               int cardno;
+
+               cardno = snd_card_get_index(argv[0]);
+               if (cardno < 0) {
+                       error("Cannot find soundcard '%s'...", argv[0]);
+                       return EXIT_FAILURE;
+               }
+               if (argc > 1) {
+                       power_state = get_int_state(argv[1]);
+                       if (power_state < 0) {
+                               error("Invalid power state '%s'...", argv[1]);
+                               return EXIT_FAILURE;
+                       }
+                       if ((err = set_power(cardno, power_state)) < 0)
+                               return err;
+               } else {
+                       if ((err = show_power(cardno)) < 0)
+                               return err;
+               }
+       }
+       return EXIT_SUCCESS;
+}
+
 int main(int argc, char *argv[])
 {
        int morehelp;
@@ -1077,7 +1242,7 @@ int main(int argc, char *argv[])
                        break;
                case 'v':
                        printf("alsactl version " SND_UTIL_VERSION_STR "\n");
-                       return 1;
+                       return EXIT_SUCCESS;
                default:
                        fprintf(stderr, "\07Invalid switch or option needs an argument.\n");
                        morehelp++;
@@ -1085,7 +1250,7 @@ int main(int argc, char *argv[])
        }
        if (morehelp) {
                help();
-               return 1;
+               return EXIT_SUCCESS;
        }
        if (argc - optind <= 0) {
                fprintf(stderr, "alsactl: Specify command...\n");
@@ -1097,6 +1262,8 @@ int main(int argc, char *argv[])
        } else if (!strcmp(argv[optind], "restore")) {
                return load_state(cfgfile, argc - optind > 1 ? argv[optind + 1] : NULL) ?
                    1 : 0;
+       } else if (!strcmp(argv[optind], "power")) {
+               return power((const char **)argv + optind + 1, argc - optind - 1);
        } else {
                fprintf(stderr, "alsactl: Unknown command '%s'...\n", argv[optind]);
        }