1 /* 2 * dw-hdmi-i2s-audio.c 3 * 4 * Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <drm/bridge/dw_hdmi.h> 11 12 #include <sound/hdmi-codec.h> 13 14 #include "dw-hdmi.h" 15 #include "dw-hdmi-audio.h" 16 17 #define DRIVER_NAME "dw-hdmi-i2s-audio" 18 19 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio, 20 u8 val, int offset) 21 { 22 struct dw_hdmi *hdmi = audio->hdmi; 23 24 audio->write(hdmi, val, offset); 25 } 26 27 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset) 28 { 29 struct dw_hdmi *hdmi = audio->hdmi; 30 31 return audio->read(hdmi, offset); 32 } 33 34 static int dw_hdmi_i2s_hw_params(struct device *dev, void *data, 35 struct hdmi_codec_daifmt *fmt, 36 struct hdmi_codec_params *hparms) 37 { 38 struct dw_hdmi_i2s_audio_data *audio = data; 39 struct dw_hdmi *hdmi = audio->hdmi; 40 u8 conf0 = 0; 41 u8 conf1 = 0; 42 u8 inputclkfs = 0; 43 44 /* it cares I2S only */ 45 if ((fmt->fmt != HDMI_I2S) || 46 (fmt->bit_clk_master | fmt->frame_clk_master)) { 47 dev_err(dev, "unsupported format/settings\n"); 48 return -EINVAL; 49 } 50 51 inputclkfs = HDMI_AUD_INPUTCLKFS_64FS; 52 conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE; 53 54 switch (hparms->sample_width) { 55 case 16: 56 conf1 = HDMI_AUD_CONF1_WIDTH_16; 57 break; 58 case 24: 59 case 32: 60 conf1 = HDMI_AUD_CONF1_WIDTH_24; 61 break; 62 } 63 64 dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate); 65 66 hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS); 67 hdmi_write(audio, conf0, HDMI_AUD_CONF0); 68 hdmi_write(audio, conf1, HDMI_AUD_CONF1); 69 70 dw_hdmi_audio_enable(hdmi); 71 72 return 0; 73 } 74 75 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data) 76 { 77 struct dw_hdmi_i2s_audio_data *audio = data; 78 struct dw_hdmi *hdmi = audio->hdmi; 79 80 dw_hdmi_audio_disable(hdmi); 81 82 hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0); 83 } 84 85 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component, 86 struct device_node *endpoint) 87 { 88 struct of_endpoint of_ep; 89 int ret; 90 91 ret = of_graph_parse_endpoint(endpoint, &of_ep); 92 if (ret < 0) 93 return ret; 94 95 /* 96 * HDMI sound should be located as reg = <2> 97 * Then, it is sound port 0 98 */ 99 if (of_ep.port == 2) 100 return 0; 101 102 return -EINVAL; 103 } 104 105 static struct hdmi_codec_ops dw_hdmi_i2s_ops = { 106 .hw_params = dw_hdmi_i2s_hw_params, 107 .audio_shutdown = dw_hdmi_i2s_audio_shutdown, 108 .get_dai_id = dw_hdmi_i2s_get_dai_id, 109 }; 110 111 static int snd_dw_hdmi_probe(struct platform_device *pdev) 112 { 113 struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data; 114 struct platform_device_info pdevinfo; 115 struct hdmi_codec_pdata pdata; 116 struct platform_device *platform; 117 118 pdata.ops = &dw_hdmi_i2s_ops; 119 pdata.i2s = 1; 120 pdata.max_i2s_channels = 6; 121 pdata.data = audio; 122 123 memset(&pdevinfo, 0, sizeof(pdevinfo)); 124 pdevinfo.parent = pdev->dev.parent; 125 pdevinfo.id = PLATFORM_DEVID_AUTO; 126 pdevinfo.name = HDMI_CODEC_DRV_NAME; 127 pdevinfo.data = &pdata; 128 pdevinfo.size_data = sizeof(pdata); 129 pdevinfo.dma_mask = DMA_BIT_MASK(32); 130 131 platform = platform_device_register_full(&pdevinfo); 132 if (IS_ERR(platform)) 133 return PTR_ERR(platform); 134 135 dev_set_drvdata(&pdev->dev, platform); 136 137 return 0; 138 } 139 140 static int snd_dw_hdmi_remove(struct platform_device *pdev) 141 { 142 struct platform_device *platform = dev_get_drvdata(&pdev->dev); 143 144 platform_device_unregister(platform); 145 146 return 0; 147 } 148 149 static struct platform_driver snd_dw_hdmi_driver = { 150 .probe = snd_dw_hdmi_probe, 151 .remove = snd_dw_hdmi_remove, 152 .driver = { 153 .name = DRIVER_NAME, 154 .owner = THIS_MODULE, 155 }, 156 }; 157 module_platform_driver(snd_dw_hdmi_driver); 158 159 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 160 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface"); 161 MODULE_LICENSE("GPL v2"); 162 MODULE_ALIAS("platform:" DRIVER_NAME); 163