drivers/gpu/drm/bridge/adv7511/adv7511_audio.c

   1 /*
   2  * Analog Devices ADV7511 HDMI transmitter driver
   3  *
   4  * Copyright 2012 Analog Devices Inc.
   5  * Copyright (c) 2016, Linaro Limited
   6  *
   7  * Licensed under the GPL-2.
   8  */
   9
  10 #include <sound/core.h>
  11 #include <sound/hdmi-codec.h>
  12 #include <sound/pcm.h>
  13 #include <sound/soc.h>
  14 #include <linux/of_graph.h>
  15
  16 #include "adv7511.h"
  17
  18 static void adv7511_calc_cts_n(unsigned int f_tmds, unsigned int fs,
  19                                unsigned int *cts, unsigned int *n)
  20 {
  21         switch (fs) {
  22         case 32000:
  23                 *n = 4096;
  24                 break;
  25         case 44100:
  26                 *n = 6272;
  27                 break;
  28         case 48000:
  29                 *n = 6144;
  30                 break;
  31         }
  32
  33         *cts = ((f_tmds * *n) / (128 * fs)) * 1000;
  34 }
  35
  36 static int adv7511_update_cts_n(struct adv7511 *adv7511)
  37 {
  38         unsigned int cts = 0;
  39         unsigned int n = 0;
  40
  41         adv7511_calc_cts_n(adv7511->f_tmds, adv7511->f_audio, &cts, &n);
  42
  43         regmap_write(adv7511->regmap, ADV7511_REG_N0, (n >> 16) & 0xf);
  44         regmap_write(adv7511->regmap, ADV7511_REG_N1, (n >> 8) & 0xff);
  45         regmap_write(adv7511->regmap, ADV7511_REG_N2, n & 0xff);
  46
  47         regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL0,
  48                      (cts >> 16) & 0xf);
  49         regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL1,
  50                      (cts >> 8) & 0xff);
  51         regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL2,
  52                      cts & 0xff);
  53
  54         return 0;
  55 }
  56
  57 int adv7511_hdmi_hw_params(struct device *dev, void *data,
  58                            struct hdmi_codec_daifmt *fmt,
  59                            struct hdmi_codec_params *hparms)
  60 {
  61         struct adv7511 *adv7511 = dev_get_drvdata(dev);
  62         unsigned int audio_source, i2s_format = 0;
  63         unsigned int invert_clock;
  64         unsigned int rate;
  65         unsigned int len;
  66
  67         switch (hparms->sample_rate) {
  68         case 32000:
  69                 rate = ADV7511_SAMPLE_FREQ_32000;
  70                 break;
  71         case 44100:
  72                 rate = ADV7511_SAMPLE_FREQ_44100;
  73                 break;
  74         case 48000:
  75                 rate = ADV7511_SAMPLE_FREQ_48000;
  76                 break;
  77         case 88200:
  78                 rate = ADV7511_SAMPLE_FREQ_88200;
  79                 break;
  80         case 96000:
  81                 rate = ADV7511_SAMPLE_FREQ_96000;
  82                 break;
  83         case 176400:
  84                 rate = ADV7511_SAMPLE_FREQ_176400;
  85                 break;
  86         case 192000:
  87                 rate = ADV7511_SAMPLE_FREQ_192000;
  88                 break;
  89         default:
  90                 return -EINVAL;
  91         }
  92
  93         switch (hparms->sample_width) {
  94         case 16:
  95                 len = ADV7511_I2S_SAMPLE_LEN_16;
  96                 break;
  97         case 18:
  98                 len = ADV7511_I2S_SAMPLE_LEN_18;
  99                 break;
 100         case 20:
 101                 len = ADV7511_I2S_SAMPLE_LEN_20;
 102                 break;
 103         case 24:
 104                 len = ADV7511_I2S_SAMPLE_LEN_24;
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         switch (fmt->fmt) {
 111         case HDMI_I2S:
 112                 audio_source = ADV7511_AUDIO_SOURCE_I2S;
 113                 i2s_format = ADV7511_I2S_FORMAT_I2S;
 114                 break;
 115         case HDMI_RIGHT_J:
 116                 audio_source = ADV7511_AUDIO_SOURCE_I2S;
 117                 i2s_format = ADV7511_I2S_FORMAT_RIGHT_J;
 118                 break;
 119         case HDMI_LEFT_J:
 120                 audio_source = ADV7511_AUDIO_SOURCE_I2S;
 121                 i2s_format = ADV7511_I2S_FORMAT_LEFT_J;
 122                 break;
 123         default:
 124                 return -EINVAL;
 125         }
 126
 127         invert_clock = fmt->bit_clk_inv;
 128
 129         regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_SOURCE, 0x70,
 130                            audio_source << 4);
 131         regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG, BIT(6),
 132                            invert_clock << 6);
 133         regmap_update_bits(adv7511->regmap, ADV7511_REG_I2S_CONFIG, 0x03,
 134                            i2s_format);
 135
 136         adv7511->audio_source = audio_source;
 137
 138         adv7511->f_audio = hparms->sample_rate;
 139
 140         adv7511_update_cts_n(adv7511);
 141
 142         regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG3,
 143                            ADV7511_AUDIO_CFG3_LEN_MASK, len);
 144         regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG,
 145                            ADV7511_I2C_FREQ_ID_CFG_RATE_MASK, rate << 4);
 146         regmap_write(adv7511->regmap, 0x73, 0x1);
 147
 148         return 0;
 149 }
 150
 151 static int audio_startup(struct device *dev, void *data)
 152 {
 153         struct adv7511 *adv7511 = dev_get_drvdata(dev);
 154
 155         regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
 156                                 BIT(7), 0);
 157
 158         /* hide Audio infoframe updates */
 159         regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
 160                                 BIT(5), BIT(5));
 161         /* enable N/CTS, enable Audio sample packets */
 162         regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 163                                 BIT(5), BIT(5));
 164         /* enable N/CTS */
 165         regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 166                                 BIT(6), BIT(6));
 167         /* not copyrighted */
 168         regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG1,
 169                                 BIT(5), BIT(5));
 170         /* enable audio infoframes */
 171         regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 172                                 BIT(3), BIT(3));
 173         /* AV mute disable */
 174         regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(0),
 175                                 BIT(7) | BIT(6), BIT(7));
 176         /* use Audio infoframe updated info */
 177         regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(1),
 178                                 BIT(5), 0);
 179         return 0;
 180 }
 181
 182 static void audio_shutdown(struct device *dev, void *data)
 183 {
 184 }
 185
 186 static int adv7511_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 187                                         struct device_node *endpoint)
 188 {
 189         struct of_endpoint of_ep;
 190         int ret;
 191
 192         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 193         if (ret < 0)
 194                 return ret;
 195
 196         /*
 197          * HDMI sound should be located as reg = <2>
 198          * Then, it is sound port 0
 199          */
 200         if (of_ep.port == 2)
 201                 return 0;
 202
 203         return -EINVAL;
 204 }
 205
 206 static const struct hdmi_codec_ops adv7511_codec_ops = {
 207         .hw_params      = adv7511_hdmi_hw_params,
 208         .audio_shutdown = audio_shutdown,
 209         .audio_startup  = audio_startup,
 210         .get_dai_id     = adv7511_hdmi_i2s_get_dai_id,
 211 };
 212
 213 static struct hdmi_codec_pdata codec_data = {
 214         .ops = &adv7511_codec_ops,
 215         .max_i2s_channels = 2,
 216         .i2s = 1,
 217 };
 218
 219 int adv7511_audio_init(struct device *dev, struct adv7511 *adv7511)
 220 {
 221         adv7511->audio_pdev = platform_device_register_data(dev,
 222                                         HDMI_CODEC_DRV_NAME,
 223                                         PLATFORM_DEVID_AUTO,
 224                                         &codec_data,
 225                                         sizeof(codec_data));
 226         return PTR_ERR_OR_ZERO(adv7511->audio_pdev);
 227 }
 228
 229 void adv7511_audio_exit(struct adv7511 *adv7511)
 230 {
 231         if (adv7511->audio_pdev) {
 232                 platform_device_unregister(adv7511->audio_pdev);
 233                 adv7511->audio_pdev = NULL;
 234         }
 235 }