drivers/sound/max98357a.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * max98357a.c -- MAX98357A Audio driver
   4  *
   5  * Copyright 2019 Google LLC
   6  * Parts taken from coreboot
   7  */
   8
   9 #include <common.h>
  10 #include <audio_codec.h>
  11 #include <dm.h>
  12 #include <log.h>
  13 #include <sound.h>
  14 #include <acpi/acpigen.h>
  15 #include <acpi/acpi_device.h>
  16 #include <acpi/acpi_dp.h>
  17 #include <asm-generic/gpio.h>
  18 #ifdef CONFIG_X86
  19 #include <asm/acpi_nhlt.h>
  20 #endif
  21 #include <dt-bindings/sound/nhlt.h>
  22 #include <dm/acpi.h>
  23
  24 struct max98357a_priv {
  25         struct gpio_desc sdmode_gpio;
  26 };
  27
  28 static int max98357a_of_to_plat(struct udevice *dev)
  29 {
  30         struct max98357a_priv *priv = dev_get_priv(dev);
  31         int ret;
  32
  33         ret = gpio_request_by_name(dev, "sdmode-gpios", 0, &priv->sdmode_gpio,
  34                                    GPIOD_IS_IN);
  35         if (ret)
  36                 return log_msg_ret("gpio", ret);
  37
  38         return 0;
  39 }
  40
  41 static int max98357a_acpi_fill_ssdt(const struct udevice *dev,
  42                                     struct acpi_ctx *ctx)
  43 {
  44         struct max98357a_priv *priv = dev_get_priv(dev);
  45         char scope[ACPI_PATH_MAX];
  46         char name[ACPI_NAME_MAX];
  47         char path[ACPI_PATH_MAX];
  48         struct acpi_dp *dp;
  49         int ret;
  50
  51         ret = acpi_device_scope(dev, scope, sizeof(scope));
  52         if (ret)
  53                 return log_msg_ret("scope", ret);
  54         ret = acpi_get_name(dev, name);
  55         if (ret)
  56                 return log_msg_ret("name", ret);
  57
  58         /* Device */
  59         acpigen_write_scope(ctx, scope);
  60         acpigen_write_device(ctx, name);
  61         acpigen_write_name_string(ctx, "_HID",
  62                                   dev_read_string(dev, "acpi,hid"));
  63         acpigen_write_name_integer(ctx, "_UID", 0);
  64         acpigen_write_name_string(ctx, "_DDN",
  65                                   dev_read_string(dev, "acpi,ddn"));
  66         acpigen_write_sta(ctx, acpi_device_status(dev));
  67
  68         /* Resources */
  69         acpigen_write_name(ctx, "_CRS");
  70         acpigen_write_resourcetemplate_header(ctx);
  71         ret = acpi_device_write_gpio_desc(ctx, &priv->sdmode_gpio);
  72         if (ret < 0)
  73                 return log_msg_ret("gpio", ret);
  74         acpigen_write_resourcetemplate_footer(ctx);
  75
  76         /* _DSD for devicetree properties */
  77         /* This points to the first pin in the first gpio entry in _CRS */
  78         ret = acpi_device_path(dev, path, sizeof(path));
  79         if (ret)
  80                 return log_msg_ret("path", ret);
  81         dp = acpi_dp_new_table("_DSD");
  82         acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
  83                          priv->sdmode_gpio.flags & GPIOD_ACTIVE_LOW ?
  84                          ACPI_GPIO_ACTIVE_LOW : ACPI_GPIO_ACTIVE_HIGH);
  85         acpi_dp_add_integer(dp, "sdmode-delay",
  86                             dev_read_u32_default(dev, "sdmode-delay", 0));
  87         acpi_dp_write(ctx, dp);
  88
  89         acpigen_pop_len(ctx); /* Device */
  90         acpigen_pop_len(ctx); /* Scope */
  91
  92         return 0;
  93 }
  94
  95 /* For now only X86 boards support NHLT */
  96 #ifdef CONFIG_X86
  97 static const struct nhlt_format_config max98357a_formats[] = {
  98         /* 48 KHz 24-bits per sample. */
  99         {
 100                 .num_channels = 2,
 101                 .sample_freq_khz = 48,
 102                 .container_bits_per_sample = 32,
 103                 .valid_bits_per_sample = 24,
 104                 .settings_file = "max98357-render-2ch-48khz-24b.dat",
 105         },
 106 };
 107
 108 static const struct nhlt_endp_descriptor max98357a_descriptors[] = {
 109         {
 110                 .link = NHLT_LINK_SSP,
 111                 .device = NHLT_SSP_DEV_I2S,
 112                 .direction = NHLT_DIR_RENDER,
 113                 .vid = NHLT_VID,
 114                 .did = NHLT_DID_SSP,
 115                 .formats = max98357a_formats,
 116                 .num_formats = ARRAY_SIZE(max98357a_formats),
 117         },
 118 };
 119
 120 static int max98357a_acpi_setup_nhlt(const struct udevice *dev,
 121                                      struct acpi_ctx *ctx)
 122 {
 123         u32 hwlink;
 124         int ret;
 125
 126         if (dev_read_u32(dev, "acpi,audio-link", &hwlink))
 127                 return log_msg_ret("link", -EINVAL);
 128
 129         /* Virtual bus id of SSP links are the hardware port ids proper. */
 130         ret = nhlt_add_ssp_endpoints(ctx->nhlt, hwlink, max98357a_descriptors,
 131                                      ARRAY_SIZE(max98357a_descriptors));
 132         if (ret)
 133                 return log_msg_ret("add", ret);
 134
 135         return 0;
 136 }
 137 #endif
 138
 139 struct acpi_ops max98357a_acpi_ops = {
 140         .fill_ssdt      = max98357a_acpi_fill_ssdt,
 141 #ifdef CONFIG_X86
 142         .setup_nhlt     = max98357a_acpi_setup_nhlt,
 143 #endif
 144 };
 145
 146 static const struct audio_codec_ops max98357a_ops = {
 147 };
 148
 149 static const struct udevice_id max98357a_ids[] = {
 150         { .compatible = "maxim,max98357a" },
 151         { }
 152 };
 153
 154 U_BOOT_DRIVER(max98357a) = {
 155         .name           = "max98357a",
 156         .id             = UCLASS_AUDIO_CODEC,
 157         .of_match       = max98357a_ids,
 158         .of_to_plat     = max98357a_of_to_plat,
 159         .ops            = &max98357a_ops,
 160         ACPI_OPS_PTR(&max98357a_acpi_ops)
 161 };