text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright (C) 2012 Samsung Electronics
   * Rajeshwari Shinde <rajeshwari.s@samsung.com>
   */
  
  #include <common.h>
  #include <command.h>
  #include <fdtdec.h>
  #include <sound.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  /* Initilaise sound subsystem */
  static int do_init(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  {
  	int ret;
  
  	ret = sound_init(gd->fdt_blob);
  	if (ret) {
  		printf("Initialise Audio driver failed\n");
  		return CMD_RET_FAILURE;
  	}
  
  	return 0;
  }
  
  /* play sound from buffer */
  static int do_play(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  {
  	int ret = 0;
  	int msec = 1000;
  	int freq = 400;
  
  	if (argc > 1)
  		msec = simple_strtoul(argv[1], NULL, 10);
  	if (argc > 2)
  		freq = simple_strtoul(argv[2], NULL, 10);
  
  	ret = sound_play(msec, freq);
  	if (ret) {
  		printf("play failed");
  		return CMD_RET_FAILURE;
  	}
  
  	return 0;
  }
  
  static cmd_tbl_t cmd_sound_sub[] = {
  	U_BOOT_CMD_MKENT(init, 0, 1, do_init, "", ""),
  	U_BOOT_CMD_MKENT(play, 2, 1, do_play, "", ""),
  };
  
  /* process sound command */
  static int do_sound(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  {
  	cmd_tbl_t *c;
  
  	if (argc < 1)
  		return CMD_RET_USAGE;
  
  	/* Strip off leading 'sound' command argument */
  	argc--;
  	argv++;
  
  	c = find_cmd_tbl(argv[0], &cmd_sound_sub[0], ARRAY_SIZE(cmd_sound_sub));
  
  	if (c)
  		return c->cmd(cmdtp, flag, argc, argv);
  	else
  		return CMD_RET_USAGE;
  }
  
  U_BOOT_CMD(
  	sound, 4, 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"
  );
  