162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* max98357a.c -- MAX98357A Audio driver
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*
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* Copyright 2019 Google LLC
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* Parts taken from coreboot
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*/
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#include <common.h>
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#include <audio_codec.h>
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#include <dm.h>
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#include <log.h>
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#include <sound.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_device.h>
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#include <acpi/acpi_dp.h>
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#include <asm-generic/gpio.h>
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#ifdef CONFIG_X86
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#include <asm/acpi_nhlt.h>
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#endif
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#include <dt-bindings/sound/nhlt.h>
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#include <dm/acpi.h>
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struct max98357a_priv {
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struct gpio_desc sdmode_gpio;
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};
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static int max98357a_of_to_plat(struct udevice *dev)
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{
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struct max98357a_priv *priv = dev_get_priv(dev);
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int ret;
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ret = gpio_request_by_name(dev, "sdmode-gpios", 0, &priv->sdmode_gpio,
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GPIOD_IS_IN);
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if (ret)
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return log_msg_ret("gpio", ret);
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return 0;
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}
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static int max98357a_acpi_fill_ssdt(const struct udevice *dev,
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struct acpi_ctx *ctx)
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{
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struct max98357a_priv *priv = dev_get_priv(dev);
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char scope[ACPI_PATH_MAX];
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char name[ACPI_NAME_MAX];
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char path[ACPI_PATH_MAX];
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struct acpi_dp *dp;
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int ret;
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ret = acpi_device_scope(dev, scope, sizeof(scope));
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if (ret)
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return log_msg_ret("scope", ret);
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ret = acpi_get_name(dev, name);
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if (ret)
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return log_msg_ret("name", ret);
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/* Device */
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acpigen_write_scope(ctx, scope);
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acpigen_write_device(ctx, name);
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acpigen_write_name_string(ctx, "_HID",
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dev_read_string(dev, "acpi,hid"));
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acpigen_write_name_integer(ctx, "_UID", 0);
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acpigen_write_name_string(ctx, "_DDN",
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dev_read_string(dev, "acpi,ddn"));
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acpigen_write_sta(ctx, acpi_device_status(dev));
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/* Resources */
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acpigen_write_name(ctx, "_CRS");
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acpigen_write_resourcetemplate_header(ctx);
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ret = acpi_device_write_gpio_desc(ctx, &priv->sdmode_gpio);
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if (ret < 0)
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return log_msg_ret("gpio", ret);
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acpigen_write_resourcetemplate_footer(ctx);
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/* _DSD for devicetree properties */
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/* This points to the first pin in the first gpio entry in _CRS */
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ret = acpi_device_path(dev, path, sizeof(path));
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if (ret)
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return log_msg_ret("path", ret);
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dp = acpi_dp_new_table("_DSD");
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acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
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priv->sdmode_gpio.flags & GPIOD_ACTIVE_LOW ?
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ACPI_GPIO_ACTIVE_LOW : ACPI_GPIO_ACTIVE_HIGH);
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acpi_dp_add_integer(dp, "sdmode-delay",
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dev_read_u32_default(dev, "sdmode-delay", 0));
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acpi_dp_write(ctx, dp);
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acpigen_pop_len(ctx); /* Device */
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acpigen_pop_len(ctx); /* Scope */
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return 0;
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}
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/* For now only X86 boards support NHLT */
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#ifdef CONFIG_X86
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static const struct nhlt_format_config max98357a_formats[] = {
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/* 48 KHz 24-bits per sample. */
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{
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.num_channels = 2,
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.sample_freq_khz = 48,
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.container_bits_per_sample = 32,
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.valid_bits_per_sample = 24,
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.settings_file = "max98357-render-2ch-48khz-24b.dat",
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},
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};
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static const struct nhlt_endp_descriptor max98357a_descriptors[] = {
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{
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.link = NHLT_LINK_SSP,
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.device = NHLT_SSP_DEV_I2S,
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.direction = NHLT_DIR_RENDER,
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.vid = NHLT_VID,
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.did = NHLT_DID_SSP,
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.formats = max98357a_formats,
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.num_formats = ARRAY_SIZE(max98357a_formats),
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},
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};
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static int max98357a_acpi_setup_nhlt(const struct udevice *dev,
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struct acpi_ctx *ctx)
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{
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u32 hwlink;
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int ret;
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if (dev_read_u32(dev, "acpi,audio-link", &hwlink))
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return log_msg_ret("link", -EINVAL);
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/* Virtual bus id of SSP links are the hardware port ids proper. */
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ret = nhlt_add_ssp_endpoints(ctx->nhlt, hwlink, max98357a_descriptors,
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ARRAY_SIZE(max98357a_descriptors));
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if (ret)
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return log_msg_ret("add", ret);
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return 0;
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}
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#endif
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struct acpi_ops max98357a_acpi_ops = {
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.fill_ssdt = max98357a_acpi_fill_ssdt,
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#ifdef CONFIG_X86
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.setup_nhlt = max98357a_acpi_setup_nhlt,
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#endif
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};
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static const struct audio_codec_ops max98357a_ops = {
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};
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static const struct udevice_id max98357a_ids[] = {
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{ .compatible = "maxim,max98357a" },
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{ }
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};
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U_BOOT_DRIVER(max98357a) = {
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.name = "max98357a",
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.id = UCLASS_AUDIO_CODEC,
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.of_match = max98357a_ids,
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.of_to_plat = max98357a_of_to_plat,
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.ops = &max98357a_ops,
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ACPI_OPS_PTR(&max98357a_acpi_ops)
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};
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