sound/soc/atmel/sam9g20_wm8731.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
   4  *                      ATMEL AT91SAM9G20ek board.
   5  *
   6  *  Copyright (C) 2005 SAN People
   7  *  Copyright (C) 2008 Atmel
   8  *
   9  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
  10  *
  11  * Based on ati_b1_wm8731.c by:
  12  * Frank Mandarino <fmandarino@endrelia.com>
  13  * Copyright 2006 Endrelia Technologies Inc.
  14  * Based on corgi.c by:
  15  * Copyright 2005 Wolfson Microelectronics PLC.
  16  * Copyright 2005 Openedhand Ltd.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/kernel.h>
  22 #include <linux/clk.h>
  23 #include <linux/timer.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/i2c.h>
  27 #include <linux/of.h>
  28
  29 #include <linux/atmel-ssc.h>
  30
  31 #include <sound/core.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/soc.h>
  35
  36 #include "../codecs/wm8731.h"
  37 #include "atmel-pcm.h"
  38 #include "atmel_ssc_dai.h"
  39
  40 #define MCLK_RATE 12000000
  41
  42 /*
  43  * As shipped the board does not have inputs.  However, it is relatively
  44  * straightforward to modify the board to hook them up so support is left
  45  * in the driver.
  46  */
  47 #undef ENABLE_MIC_INPUT
  48
  49 static struct clk *mclk;
  50
  51 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  52                                         struct snd_soc_dapm_context *dapm,
  53                                         enum snd_soc_bias_level level)
  54 {
  55         static int mclk_on;
  56         int ret = 0;
  57
  58         switch (level) {
  59         case SND_SOC_BIAS_ON:
  60         case SND_SOC_BIAS_PREPARE:
  61                 if (!mclk_on)
  62                         ret = clk_enable(mclk);
  63                 if (ret == 0)
  64                         mclk_on = 1;
  65                 break;
  66
  67         case SND_SOC_BIAS_OFF:
  68         case SND_SOC_BIAS_STANDBY:
  69                 if (mclk_on)
  70                         clk_disable(mclk);
  71                 mclk_on = 0;
  72                 break;
  73         }
  74
  75         return ret;
  76 }
  77
  78 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
  79         SND_SOC_DAPM_MIC("Int Mic", NULL),
  80         SND_SOC_DAPM_SPK("Ext Spk", NULL),
  81 };
  82
  83 static const struct snd_soc_dapm_route intercon[] = {
  84
  85         /* speaker connected to LHPOUT/RHPOUT */
  86         {"Ext Spk", NULL, "LHPOUT"},
  87         {"Ext Spk", NULL, "RHPOUT"},
  88
  89         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
  90         {"MICIN", NULL, "Mic Bias"},
  91         {"Mic Bias", NULL, "Int Mic"},
  92 };
  93
  94 /*
  95  * Logic for a wm8731 as connected on a at91sam9g20ek board.
  96  */
  97 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
  98 {
  99         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 100         struct device *dev = rtd->dev;
 101         int ret;
 102
 103         dev_dbg(dev, "%s called\n", __func__);
 104
 105         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 106                                      MCLK_RATE, SND_SOC_CLOCK_IN);
 107         if (ret < 0) {
 108                 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
 109                 return ret;
 110         }
 111
 112 #ifndef ENABLE_MIC_INPUT
 113         snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
 114 #endif
 115
 116         return 0;
 117 }
 118
 119 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 120         .name = "WM8731",
 121         .stream_name = "WM8731 PCM",
 122         .cpu_dai_name = "at91rm9200_ssc.0",
 123         .codec_dai_name = "wm8731-hifi",
 124         .init = at91sam9g20ek_wm8731_init,
 125         .platform_name = "at91rm9200_ssc.0",
 126         .codec_name = "wm8731.0-001b",
 127         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 128                    SND_SOC_DAIFMT_CBM_CFM,
 129 };
 130
 131 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 132         .name = "AT91SAMG20-EK",
 133         .owner = THIS_MODULE,
 134         .dai_link = &at91sam9g20ek_dai,
 135         .num_links = 1,
 136         .set_bias_level = at91sam9g20ek_set_bias_level,
 137
 138         .dapm_widgets = at91sam9g20ek_dapm_widgets,
 139         .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
 140         .dapm_routes = intercon,
 141         .num_dapm_routes = ARRAY_SIZE(intercon),
 142         .fully_routed = true,
 143 };
 144
 145 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
 146 {
 147         struct device_node *np = pdev->dev.of_node;
 148         struct device_node *codec_np, *cpu_np;
 149         struct clk *pllb;
 150         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
 151         int ret;
 152
 153         if (!np) {
 154                 return -ENODEV;
 155         }
 156
 157         ret = atmel_ssc_set_audio(0);
 158         if (ret) {
 159                 dev_err(&pdev->dev, "ssc channel is not valid\n");
 160                 return -EINVAL;
 161         }
 162
 163         /*
 164          * Codec MCLK is supplied by PCK0 - set it up.
 165          */
 166         mclk = clk_get(NULL, "pck0");
 167         if (IS_ERR(mclk)) {
 168                 dev_err(&pdev->dev, "Failed to get MCLK\n");
 169                 ret = PTR_ERR(mclk);
 170                 goto err;
 171         }
 172
 173         pllb = clk_get(NULL, "pllb");
 174         if (IS_ERR(pllb)) {
 175                 dev_err(&pdev->dev, "Failed to get PLLB\n");
 176                 ret = PTR_ERR(pllb);
 177                 goto err_mclk;
 178         }
 179         ret = clk_set_parent(mclk, pllb);
 180         clk_put(pllb);
 181         if (ret != 0) {
 182                 dev_err(&pdev->dev, "Failed to set MCLK parent\n");
 183                 goto err_mclk;
 184         }
 185
 186         clk_set_rate(mclk, MCLK_RATE);
 187
 188         card->dev = &pdev->dev;
 189
 190         /* Parse device node info */
 191         ret = snd_soc_of_parse_card_name(card, "atmel,model");
 192         if (ret)
 193                 goto err;
 194
 195         ret = snd_soc_of_parse_audio_routing(card,
 196                 "atmel,audio-routing");
 197         if (ret)
 198                 goto err;
 199
 200         /* Parse codec info */
 201         at91sam9g20ek_dai.codec_name = NULL;
 202         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 203         if (!codec_np) {
 204                 dev_err(&pdev->dev, "codec info missing\n");
 205                 return -EINVAL;
 206         }
 207         at91sam9g20ek_dai.codec_of_node = codec_np;
 208
 209         /* Parse dai and platform info */
 210         at91sam9g20ek_dai.cpu_dai_name = NULL;
 211         at91sam9g20ek_dai.platform_name = NULL;
 212         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 213         if (!cpu_np) {
 214                 dev_err(&pdev->dev, "dai and pcm info missing\n");
 215                 return -EINVAL;
 216         }
 217         at91sam9g20ek_dai.cpu_of_node = cpu_np;
 218         at91sam9g20ek_dai.platform_of_node = cpu_np;
 219
 220         of_node_put(codec_np);
 221         of_node_put(cpu_np);
 222
 223         ret = snd_soc_register_card(card);
 224         if (ret) {
 225                 dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
 226         }
 227
 228         return ret;
 229
 230 err_mclk:
 231         clk_put(mclk);
 232         mclk = NULL;
 233 err:
 234         atmel_ssc_put_audio(0);
 235         return ret;
 236 }
 237
 238 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
 239 {
 240         struct snd_soc_card *card = platform_get_drvdata(pdev);
 241
 242         clk_disable(mclk);
 243         mclk = NULL;
 244         snd_soc_unregister_card(card);
 245         atmel_ssc_put_audio(0);
 246
 247         return 0;
 248 }
 249
 250 #ifdef CONFIG_OF
 251 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
 252         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
 253         { }
 254 };
 255 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
 256 #endif
 257
 258 static struct platform_driver at91sam9g20ek_audio_driver = {
 259         .driver = {
 260                 .name   = "at91sam9g20ek-audio",
 261                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
 262         },
 263         .probe  = at91sam9g20ek_audio_probe,
 264         .remove = at91sam9g20ek_audio_remove,
 265 };
 266
 267 module_platform_driver(at91sam9g20ek_audio_driver);
 268
 269 /* Module information */
 270 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 271 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 272 MODULE_ALIAS("platform:at91sam9g20ek-audio");
 273 MODULE_LICENSE("GPL");