sound/soc/xilinx/xilinx-dp-pcm.c

   1 /*
   2  * Xilinx DisplayPort Sound PCM support
   3  *
   4  *  Copyright (C) 2015 Xilinx, Inc.
   5  *
   6  *  Author: Hyun Woo Kwon <hyunk@xilinx.com>
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <sound/dmaengine_pcm.h>
  23 #include <sound/pcm.h>
  24 #include <sound/soc.h>
  25
  26 static const struct snd_pcm_hardware xilinx_pcm_hw = {
  27         .info                   = SNDRV_PCM_INFO_MMAP |
  28                                   SNDRV_PCM_INFO_MMAP_VALID |
  29                                   SNDRV_PCM_INFO_INTERLEAVED |
  30                                   SNDRV_PCM_INFO_PAUSE |
  31                                   SNDRV_PCM_INFO_RESUME |
  32                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  33         .buffer_bytes_max       = 128 * 1024,
  34         .period_bytes_min       = 256,
  35         .period_bytes_max       = 1024 * 1024,
  36         .periods_min            = 2,
  37         .periods_max            = 256,
  38 };
  39
  40 static const struct snd_dmaengine_pcm_config xilinx_dmaengine_pcm_config = {
  41         .pcm_hardware = &xilinx_pcm_hw,
  42         .prealloc_buffer_size = 64 * 1024,
  43 };
  44
  45 static int xilinx_dp_pcm_probe(struct platform_device *pdev)
  46 {
  47         int ret;
  48
  49         ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
  50                                               &xilinx_dmaengine_pcm_config, 0);
  51         if (ret)
  52                 return ret;
  53
  54         dev_info(&pdev->dev, "Xilinx DisplayPort Sound PCM probed\n");
  55
  56         return 0;
  57 }
  58
  59 static int xilinx_dp_pcm_dev_remove(struct platform_device *pdev)
  60 {
  61         return 0;
  62 }
  63
  64 static const struct of_device_id xilinx_dp_pcm_of_match[] = {
  65         { .compatible = "xlnx,dp-snd-pcm", },
  66         { /* end of table */ },
  67 };
  68 MODULE_DEVICE_TABLE(of, xilinx_dp_pcm_of_match);
  69
  70 static struct platform_driver xilinx_dp_pcm_driver = {
  71         .driver = {
  72                 .name           = "xilinx-dp-snd-pcm",
  73                 .of_match_table = xilinx_dp_pcm_of_match,
  74         },
  75         .probe  = xilinx_dp_pcm_probe,
  76         .remove = xilinx_dp_pcm_dev_remove,
  77 };
  78 module_platform_driver(xilinx_dp_pcm_driver);
  79
  80 MODULE_DESCRIPTION("Xilinx DisplayPort Sound PCM module");
  81 MODULE_LICENSE("GPL v2");