kernel/sound/soc/qcom/apq8016_sbc.c

   1 /*
   2  * Copyright (c) 2015 The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/io.h>
  19 #include <linux/of.h>
  20 #include <linux/clk.h>
  21 #include <linux/platform_device.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <dt-bindings/sound/apq8016-lpass.h>
  26
  27 struct apq8016_sbc_data {
  28         void __iomem *mic_iomux;
  29         void __iomem *spkr_iomux;
  30         struct snd_soc_dai_link dai_link[];     /* dynamically allocated */
  31 };
  32
  33 #define MIC_CTRL_QUA_WS_SLAVE_SEL_10    BIT(17)
  34 #define MIC_CTRL_TLMM_SCLK_EN           BIT(1)
  35 #define SPKR_CTL_PRI_WS_SLAVE_SEL_11    (BIT(17) | BIT(16))
  36
  37 static int apq8016_sbc_dai_init(struct snd_soc_pcm_runtime *rtd)
  38 {
  39         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  40         struct snd_soc_card *card = rtd->card;
  41         struct apq8016_sbc_data *pdata = snd_soc_card_get_drvdata(card);
  42         int rval = 0;
  43
  44         switch (cpu_dai->id) {
  45         case MI2S_PRIMARY:
  46                 writel(readl(pdata->spkr_iomux) | SPKR_CTL_PRI_WS_SLAVE_SEL_11,
  47                         pdata->spkr_iomux);
  48                 break;
  49
  50         case MI2S_QUATERNARY:
  51                 /* Configure the Quat MI2S to TLMM */
  52                 writel(readl(pdata->mic_iomux) | MIC_CTRL_QUA_WS_SLAVE_SEL_10 |
  53                         MIC_CTRL_TLMM_SCLK_EN,
  54                         pdata->mic_iomux);
  55                 break;
  56
  57         default:
  58                 dev_err(card->dev, "unsupported cpu dai configuration\n");
  59                 rval = -EINVAL;
  60                 break;
  61
  62         }
  63
  64         return rval;
  65 }
  66
  67 static struct apq8016_sbc_data *apq8016_sbc_parse_of(struct snd_soc_card *card)
  68 {
  69         struct device *dev = card->dev;
  70         struct snd_soc_dai_link *link;
  71         struct device_node *np, *codec, *cpu, *node  = dev->of_node;
  72         struct apq8016_sbc_data *data;
  73         int ret, num_links;
  74
  75         ret = snd_soc_of_parse_card_name(card, "qcom,model");
  76         if (ret) {
  77                 dev_err(dev, "Error parsing card name: %d\n", ret);
  78                 return ERR_PTR(ret);
  79         }
  80
  81         /* Populate links */
  82         num_links = of_get_child_count(node);
  83
  84         /* Allocate the private data and the DAI link array */
  85         data = devm_kzalloc(dev, sizeof(*data) + sizeof(*link) * num_links,
  86                             GFP_KERNEL);
  87         if (!data)
  88                 return ERR_PTR(-ENOMEM);
  89
  90         card->dai_link  = &data->dai_link[0];
  91         card->num_links = num_links;
  92
  93         link = data->dai_link;
  94
  95         for_each_child_of_node(node, np) {
  96                 cpu = of_get_child_by_name(np, "cpu");
  97                 codec = of_get_child_by_name(np, "codec");
  98
  99                 if (!cpu || !codec) {
 100                         dev_err(dev, "Can't find cpu/codec DT node\n");
 101                         return ERR_PTR(-EINVAL);
 102                 }
 103
 104                 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
 105                 if (!link->cpu_of_node) {
 106                         dev_err(card->dev, "error getting cpu phandle\n");
 107                         return ERR_PTR(-EINVAL);
 108                 }
 109
 110                 link->codec_of_node = of_parse_phandle(codec, "sound-dai", 0);
 111                 if (!link->codec_of_node) {
 112                         dev_err(card->dev, "error getting codec phandle\n");
 113                         return ERR_PTR(-EINVAL);
 114                 }
 115
 116                 ret = snd_soc_of_get_dai_name(cpu, &link->cpu_dai_name);
 117                 if (ret) {
 118                         dev_err(card->dev, "error getting cpu dai name\n");
 119                         return ERR_PTR(ret);
 120                 }
 121
 122                 ret = snd_soc_of_get_dai_name(codec, &link->codec_dai_name);
 123                 if (ret) {
 124                         dev_err(card->dev, "error getting codec dai name\n");
 125                         return ERR_PTR(ret);
 126                 }
 127
 128                 link->platform_of_node = link->cpu_of_node;
 129                 /* For now we only support playback */
 130                 link->playback_only = true;
 131
 132                 ret = of_property_read_string(np, "link-name", &link->name);
 133                 if (ret) {
 134                         dev_err(card->dev, "error getting codec dai_link name\n");
 135                         return ERR_PTR(ret);
 136                 }
 137
 138                 link->stream_name = link->name;
 139                 link->init = apq8016_sbc_dai_init;
 140                 link++;
 141         }
 142
 143         return data;
 144 }
 145
 146 static int apq8016_sbc_platform_probe(struct platform_device *pdev)
 147 {
 148         struct device *dev = &pdev->dev;
 149         struct snd_soc_card *card;
 150         struct apq8016_sbc_data *data;
 151         struct resource *res;
 152
 153         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 154         if (!card)
 155                 return -ENOMEM;
 156
 157         card->dev = dev;
 158         data = apq8016_sbc_parse_of(card);
 159         if (IS_ERR(data)) {
 160                 dev_err(&pdev->dev, "Error resolving dai links: %ld\n",
 161                         PTR_ERR(data));
 162                 return PTR_ERR(data);
 163         }
 164
 165         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mic-iomux");
 166         data->mic_iomux = devm_ioremap_resource(dev, res);
 167         if (IS_ERR(data->mic_iomux))
 168                 return PTR_ERR(data->mic_iomux);
 169
 170         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "spkr-iomux");
 171         data->spkr_iomux = devm_ioremap_resource(dev, res);
 172         if (IS_ERR(data->spkr_iomux))
 173                 return PTR_ERR(data->spkr_iomux);
 174
 175         platform_set_drvdata(pdev, data);
 176         snd_soc_card_set_drvdata(card, data);
 177
 178         return devm_snd_soc_register_card(&pdev->dev, card);
 179 }
 180
 181 static const struct of_device_id apq8016_sbc_device_id[]  = {
 182         { .compatible = "qcom,apq8016-sbc-sndcard" },
 183         {},
 184 };
 185 MODULE_DEVICE_TABLE(of, apq8016_sbc_device_id);
 186
 187 static struct platform_driver apq8016_sbc_platform_driver = {
 188         .driver = {
 189                 .name = "qcom-apq8016-sbc",
 190                 .of_match_table = of_match_ptr(apq8016_sbc_device_id),
 191         },
 192         .probe = apq8016_sbc_platform_probe,
 193 };
 194 module_platform_driver(apq8016_sbc_platform_driver);
 195
 196 MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org");
 197 MODULE_DESCRIPTION("APQ8016 ASoC Machine Driver");
 198 MODULE_LICENSE("GPL v2");