src/ec/google/chromeec/audio_codec/audio_codec.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <acpi/acpi_device.h>
   4 #include <acpi/acpigen.h>
   5 #include <console/console.h>
   6 #include <device/device.h>
   7 #include <device/path.h>
   8 #include <stdio.h>
   9
  10 #include "chip.h"
  11
  12 #define CROS_EC_AUDIO_CODEC_HID         "GOOG0013"
  13 #define CROS_EC_AUDIO_CODEC_DDN         "Cros EC audio codec"
  14
  15 static void crosec_audio_codec_fill_ssdt(const struct device *dev)
  16 {
  17         const char *scope = acpi_device_scope(dev);
  18         struct ec_google_chromeec_audio_codec_config *cfg = dev->chip_info;
  19
  20         if (!scope || !cfg)
  21                 return;
  22
  23         acpigen_write_scope(scope);
  24
  25         acpigen_write_device(acpi_device_name(dev));
  26         acpigen_write_name_string("_HID", CROS_EC_AUDIO_CODEC_HID);
  27         acpigen_write_name_integer("_UID", cfg->uid);
  28         acpigen_write_name_string("_DDN", CROS_EC_AUDIO_CODEC_DDN);
  29         acpigen_write_STA(acpi_device_status(dev));
  30
  31         acpigen_pop_len(); /* Device */
  32         acpigen_pop_len(); /* Scope */
  33
  34         printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), CROS_EC_AUDIO_CODEC_DDN,
  35                                                 dev_path(dev));
  36 }
  37
  38 static const char *crosec_audio_codec_acpi_name(const struct device *dev)
  39 {
  40         struct ec_google_chromeec_audio_codec_config *cfg = dev->chip_info;
  41         static char name[5];
  42
  43         if (cfg->name)
  44                 return cfg->name;
  45
  46         snprintf(name, sizeof(name), "ECA%X", dev->path.generic.id);
  47         return name;
  48 }
  49
  50 static struct device_operations crosec_audio_codec_ops = {
  51         .read_resources         = noop_read_resources,
  52         .set_resources          = noop_set_resources,
  53         .acpi_name              = crosec_audio_codec_acpi_name,
  54         .acpi_fill_ssdt         = crosec_audio_codec_fill_ssdt,
  55         .scan_bus               = scan_static_bus,
  56 };
  57
  58 static void crosec_audio_codec_enable(struct device *dev)
  59 {
  60         dev->ops = &crosec_audio_codec_ops;
  61 }
  62
  63 struct chip_operations ec_google_chromeec_audio_codec_ops = {
  64         .name = "CrosEC Audio Codec Device",
  65         .enable_dev = crosec_audio_codec_enable
  66 };