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- // SPDX-License-Identifier: GPL-2.0
- /*
- * max98357a.c -- MAX98357A Audio driver
- *
- * Copyright 2019 Google LLC
- * Parts taken from coreboot
- */
- #include <common.h>
- #include <audio_codec.h>
- #include <dm.h>
- #include <log.h>
- #include <sound.h>
- #include <acpi/acpigen.h>
- #include <acpi/acpi_device.h>
- #include <acpi/acpi_dp.h>
- #include <asm-generic/gpio.h>
- #ifdef CONFIG_X86
- #include <asm/acpi_nhlt.h>
- #endif
- #include <dt-bindings/sound/nhlt.h>
- #include <dm/acpi.h>
- struct max98357a_priv {
- struct gpio_desc sdmode_gpio;
- };
- static int max98357a_ofdata_to_platdata(struct udevice *dev)
- {
- struct max98357a_priv *priv = dev_get_priv(dev);
- int ret;
- ret = gpio_request_by_name(dev, "sdmode-gpios", 0, &priv->sdmode_gpio,
- GPIOD_IS_IN);
- if (ret)
- return log_msg_ret("gpio", ret);
- return 0;
- }
- static int max98357a_acpi_fill_ssdt(const struct udevice *dev,
- struct acpi_ctx *ctx)
- {
- struct max98357a_priv *priv = dev_get_priv(dev);
- char scope[ACPI_PATH_MAX];
- char name[ACPI_NAME_MAX];
- char path[ACPI_PATH_MAX];
- struct acpi_dp *dp;
- int ret;
- ret = acpi_device_scope(dev, scope, sizeof(scope));
- if (ret)
- return log_msg_ret("scope", ret);
- ret = acpi_get_name(dev, name);
- if (ret)
- return log_msg_ret("name", ret);
- /* Device */
- acpigen_write_scope(ctx, scope);
- acpigen_write_device(ctx, name);
- acpigen_write_name_string(ctx, "_HID",
- dev_read_string(dev, "acpi,hid"));
- acpigen_write_name_integer(ctx, "_UID", 0);
- acpigen_write_name_string(ctx, "_DDN",
- dev_read_string(dev, "acpi,ddn"));
- acpigen_write_sta(ctx, acpi_device_status(dev));
- /* Resources */
- acpigen_write_name(ctx, "_CRS");
- acpigen_write_resourcetemplate_header(ctx);
- ret = acpi_device_write_gpio_desc(ctx, &priv->sdmode_gpio);
- if (ret < 0)
- return log_msg_ret("gpio", ret);
- acpigen_write_resourcetemplate_footer(ctx);
- /* _DSD for devicetree properties */
- /* This points to the first pin in the first gpio entry in _CRS */
- ret = acpi_device_path(dev, path, sizeof(path));
- if (ret)
- return log_msg_ret("path", ret);
- dp = acpi_dp_new_table("_DSD");
- acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
- priv->sdmode_gpio.flags & GPIOD_ACTIVE_LOW ?
- ACPI_GPIO_ACTIVE_LOW : ACPI_GPIO_ACTIVE_HIGH);
- acpi_dp_add_integer(dp, "sdmode-delay",
- dev_read_u32_default(dev, "sdmode-delay", 0));
- acpi_dp_write(ctx, dp);
- acpigen_pop_len(ctx); /* Device */
- acpigen_pop_len(ctx); /* Scope */
- return 0;
- }
- /* For now only X86 boards support NHLT */
- #ifdef CONFIG_X86
- static const struct nhlt_format_config max98357a_formats[] = {
- /* 48 KHz 24-bits per sample. */
- {
- .num_channels = 2,
- .sample_freq_khz = 48,
- .container_bits_per_sample = 32,
- .valid_bits_per_sample = 24,
- .settings_file = "max98357-render-2ch-48khz-24b.dat",
- },
- };
- static const struct nhlt_endp_descriptor max98357a_descriptors[] = {
- {
- .link = NHLT_LINK_SSP,
- .device = NHLT_SSP_DEV_I2S,
- .direction = NHLT_DIR_RENDER,
- .vid = NHLT_VID,
- .did = NHLT_DID_SSP,
- .formats = max98357a_formats,
- .num_formats = ARRAY_SIZE(max98357a_formats),
- },
- };
- static int max98357a_acpi_setup_nhlt(const struct udevice *dev,
- struct acpi_ctx *ctx)
- {
- u32 hwlink;
- int ret;
- if (dev_read_u32(dev, "acpi,audio-link", &hwlink))
- return log_msg_ret("link", -EINVAL);
- /* Virtual bus id of SSP links are the hardware port ids proper. */
- ret = nhlt_add_ssp_endpoints(ctx->nhlt, hwlink, max98357a_descriptors,
- ARRAY_SIZE(max98357a_descriptors));
- if (ret)
- return log_msg_ret("add", ret);
- return 0;
- }
- #endif
- struct acpi_ops max98357a_acpi_ops = {
- .fill_ssdt = max98357a_acpi_fill_ssdt,
- #ifdef CONFIG_X86
- .setup_nhlt = max98357a_acpi_setup_nhlt,
- #endif
- };
- static const struct audio_codec_ops max98357a_ops = {
- };
- static const struct udevice_id max98357a_ids[] = {
- { .compatible = "maxim,max98357a" },
- { }
- };
- U_BOOT_DRIVER(max98357a) = {
- .name = "max98357a",
- .id = UCLASS_AUDIO_CODEC,
- .of_match = max98357a_ids,
- .ofdata_to_platdata = max98357a_ofdata_to_platdata,
- .ops = &max98357a_ops,
- ACPI_OPS_PTR(&max98357a_acpi_ops)
- };
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