cmd: allow sound command to play multiple sounds

Currently the sound command accepts only one value each for duration and
frequency. Allowing more duration and frequency arguments enables playing a
tune.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd/sound.c

@@ -39,26 +39,39 @@ static int do_play(struct cmd_tbl *cmdtp, int flag, int argc,
 	int ret = 0;
 	int msec = 1000;
 	int freq = 400;
-
+	bool first = true;
-	if (argc > 1)
-		msec = dectoul(argv[1], NULL);
-	if (argc > 2)
-		freq = dectoul(argv[2], NULL);
 
 	ret = uclass_first_device_err(UCLASS_SOUND, &dev);
-	if (!ret)
+	if (ret)
+		goto err;
+	--argc;
+	++argv;
+	while (argc || first) {
+		first = false;
+		if (argc && *argv[0] != '-') {
+			msec = dectoul(argv[0], NULL);
+			--argc;
+			++argv;
+		}
+		if (argc && *argv[0] != '-') {
+			freq = dectoul(argv[0], NULL);
+			--argc;
+			++argv;
+		}
 		ret = sound_beep(dev, msec, freq);
-	if (ret) {
+		if (ret)
-		printf("Sound device failed to play (err=%d)\n", ret);
+			goto err;
-		return CMD_RET_FAILURE;
 	}
-
 	return 0;
+
+err:
+	printf("Sound device failed to play (err=%d)\n", ret);
+	return CMD_RET_FAILURE;
 }
 
 static struct cmd_tbl cmd_sound_sub[] = {
 	U_BOOT_CMD_MKENT(init, 0, 1, do_init, "", ""),
-	U_BOOT_CMD_MKENT(play, 2, 1, do_play, "", ""),
+	U_BOOT_CMD_MKENT(play, INT_MAX, 1, do_play, "", ""),
 };
 
 /* process sound command */
@@ -83,8 +96,10 @@ static int do_sound(struct cmd_tbl *cmdtp, int flag, int argc,
 }
 
 U_BOOT_CMD(
-	sound, 4, 1, do_sound,
+	sound, INT_MAX, 1, do_sound,
 	"sound sub-system",
 	"init - initialise the sound driver\n"
-	"sound play [len [freq]] - play a sound for len ms at freq Hz\n"
+	"sound play [[[-q|-s] len [freq]] ...] - play sounds\n"
+	"  len - duration in ms\n"
+	"  freq - frequency in Hz\n"
 );

doc/usage/cmd/sound.rst

@@ -10,12 +10,12 @@ Synopsis
 ::
 
     sound init
-    sound play [len [freq]]
+    sound play [[len freq] ...] [len [freq]]
 
 Description
 -----------
 
-The *sound* command is used to play a beep sound.
+The *sound* command is used to play one or multiple beep sounds.
 
 sound init
     initializes the sound driver.
@@ -30,6 +30,25 @@ len
 freq
     frequency of the sound in Hz, defaults to 400 Hz
 
+Examples
+--------
+
+Beep at 400 Hz for 1000 ms::
+
+    sound play
+
+Beep at 400 Hz for 600 ms::
+
+    sound play 600
+
+Beep at 500 Hz for 600 ms::
+
+    sound play 600 500
+
+Play melody::
+
+    sound play 500 1047 500 880 500 0 500 1047 500 880 500 0 500 784 500 698 500 784 1000 698
+
 Configuration
 -------------