// SPDX-License-Identifier: GPL-2.0-only /* * AMD common ACP PCI driver for ACP6.3, ACP7.0 & ACP7.1 platforms. * * Copyright 2022, 2025 Advanced Micro Devices, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "../mach-config.h" #include "acp63.h" static void handle_acp70_sdw_wake_event(struct acp63_dev_data *adata) { struct amd_sdw_manager *amd_manager; if (adata->acp70_sdw0_wake_event) { amd_manager = dev_get_drvdata(&adata->sdw->pdev[0]->dev); if (amd_manager) pm_request_resume(amd_manager->dev); adata->acp70_sdw0_wake_event = 0; } if (adata->acp70_sdw1_wake_event) { amd_manager = dev_get_drvdata(&adata->sdw->pdev[1]->dev); if (amd_manager) pm_request_resume(amd_manager->dev); adata->acp70_sdw1_wake_event = 0; } } static short int check_and_handle_acp70_sdw_wake_irq(struct acp63_dev_data *adata) { u32 ext_intr_stat1; int irq_flag = 0; bool sdw_wake_irq = false; ext_intr_stat1 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); if (ext_intr_stat1 & ACP70_SDW0_HOST_WAKE_STAT) { writel(ACP70_SDW0_HOST_WAKE_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp70_sdw0_wake_event = true; sdw_wake_irq = true; } if (ext_intr_stat1 & ACP70_SDW1_HOST_WAKE_STAT) { writel(ACP70_SDW1_HOST_WAKE_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp70_sdw1_wake_event = true; sdw_wake_irq = true; } if (ext_intr_stat1 & ACP70_SDW0_PME_STAT) { writel(0, adata->acp63_base + ACP_SW0_WAKE_EN); writel(ACP70_SDW0_PME_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp70_sdw0_wake_event = true; sdw_wake_irq = true; } if (ext_intr_stat1 & ACP70_SDW1_PME_STAT) { writel(0, adata->acp63_base + ACP_SW1_WAKE_EN); writel(ACP70_SDW1_PME_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp70_sdw1_wake_event = true; sdw_wake_irq = true; } if (sdw_wake_irq) { handle_acp70_sdw_wake_event(adata); irq_flag = 1; } return irq_flag; } static short int check_and_handle_sdw_dma_irq(struct acp63_dev_data *adata, u32 ext_intr_stat, u32 ext_intr_stat1) { u32 stream_id = 0; u16 sdw_dma_irq_flag = 0; u16 index; if (ext_intr_stat & ACP63_SDW_DMA_IRQ_MASK) { for (index = ACP_AUDIO2_RX_THRESHOLD; index <= ACP_AUDIO0_TX_THRESHOLD; index++) { if (ext_intr_stat & BIT(index)) { writel(BIT(index), adata->acp63_base + ACP_EXTERNAL_INTR_STAT); switch (index) { case ACP_AUDIO0_TX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO0_TX; break; case ACP_AUDIO1_TX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO1_TX; break; case ACP_AUDIO2_TX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO2_TX; break; case ACP_AUDIO0_RX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO0_RX; break; case ACP_AUDIO1_RX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO1_RX; break; case ACP_AUDIO2_RX_THRESHOLD: stream_id = ACP63_SDW0_AUDIO2_RX; break; } switch (adata->acp_rev) { case ACP63_PCI_REV: adata->acp63_sdw0_dma_intr_stat[stream_id] = 1; break; case ACP70_PCI_REV: case ACP71_PCI_REV: adata->acp70_sdw0_dma_intr_stat[stream_id] = 1; break; } sdw_dma_irq_flag = 1; } } } switch (adata->acp_rev) { case ACP63_PCI_REV: if (ext_intr_stat1 & ACP63_P1_AUDIO1_RX_THRESHOLD) { writel(ACP63_P1_AUDIO1_RX_THRESHOLD, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp63_sdw1_dma_intr_stat[ACP63_SDW1_AUDIO1_RX] = 1; sdw_dma_irq_flag = 1; } if (ext_intr_stat1 & ACP63_P1_AUDIO1_TX_THRESHOLD) { writel(ACP63_P1_AUDIO1_TX_THRESHOLD, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); adata->acp63_sdw1_dma_intr_stat[ACP63_SDW1_AUDIO1_TX] = 1; sdw_dma_irq_flag = 1; } break; case ACP70_PCI_REV: case ACP71_PCI_REV: if (ext_intr_stat1 & ACP70_P1_SDW_DMA_IRQ_MASK) { for (index = ACP70_P1_AUDIO2_RX_THRESHOLD; index <= ACP70_P1_AUDIO0_TX_THRESHOLD; index++) { if (ext_intr_stat1 & BIT(index)) { writel(BIT(index), adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); switch (index) { case ACP70_P1_AUDIO0_TX_THRESHOLD: stream_id = ACP70_SDW_AUDIO0_TX; break; case ACP70_P1_AUDIO1_TX_THRESHOLD: stream_id = ACP70_SDW_AUDIO1_TX; break; case ACP70_P1_AUDIO2_TX_THRESHOLD: stream_id = ACP70_SDW_AUDIO2_TX; break; case ACP70_P1_AUDIO0_RX_THRESHOLD: stream_id = ACP70_SDW_AUDIO0_RX; break; case ACP70_P1_AUDIO1_RX_THRESHOLD: stream_id = ACP70_SDW_AUDIO1_RX; break; case ACP70_P1_AUDIO2_RX_THRESHOLD: stream_id = ACP70_SDW_AUDIO2_RX; break; } adata->acp70_sdw1_dma_intr_stat[stream_id] = 1; sdw_dma_irq_flag = 1; } } } break; } return sdw_dma_irq_flag; } static irqreturn_t acp63_irq_thread(int irq, void *context) { struct acp63_dev_data *adata = context; acp_hw_sdw_dma_irq_thread(adata); return IRQ_HANDLED; } static irqreturn_t acp63_irq_handler(int irq, void *dev_id) { struct acp63_dev_data *adata; struct pdm_dev_data *ps_pdm_data; struct amd_sdw_manager *amd_manager; u32 ext_intr_stat, ext_intr_stat1; u16 irq_flag = 0; u16 sdw_dma_irq_flag = 0; adata = dev_id; if (!adata) return IRQ_NONE; /* ACP interrupts will be cleared by reading particular bit and writing * same value to the status register. writing zero's doesn't have any * effect. * Bit by bit checking of IRQ field is implemented. */ ext_intr_stat = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT); if (ext_intr_stat & ACP_SDW0_STAT) { writel(ACP_SDW0_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT); amd_manager = dev_get_drvdata(&adata->sdw->pdev[0]->dev); if (amd_manager) schedule_work(&amd_manager->amd_sdw_irq_thread); irq_flag = 1; } ext_intr_stat1 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); if (ext_intr_stat1 & ACP_SDW1_STAT) { writel(ACP_SDW1_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1); amd_manager = dev_get_drvdata(&adata->sdw->pdev[1]->dev); if (amd_manager) schedule_work(&amd_manager->amd_sdw_irq_thread); irq_flag = 1; } if (ext_intr_stat & ACP_ERROR_IRQ) { writel(ACP_ERROR_IRQ, adata->acp63_base + ACP_EXTERNAL_INTR_STAT); /* TODO: Report SoundWire Manager instance errors */ writel(0, adata->acp63_base + ACP_SW0_I2S_ERROR_REASON); writel(0, adata->acp63_base + ACP_SW1_I2S_ERROR_REASON); writel(0, adata->acp63_base + ACP_ERROR_STATUS); irq_flag = 1; } if (adata->acp_rev >= ACP70_PCI_REV) irq_flag = check_and_handle_acp70_sdw_wake_irq(adata); if (ext_intr_stat & BIT(PDM_DMA_STAT)) { ps_pdm_data = dev_get_drvdata(&adata->pdm_dev->dev); writel(BIT(PDM_DMA_STAT), adata->acp63_base + ACP_EXTERNAL_INTR_STAT); if (ps_pdm_data->capture_stream) snd_pcm_period_elapsed(ps_pdm_data->capture_stream); irq_flag = 1; } sdw_dma_irq_flag = check_and_handle_sdw_dma_irq(adata, ext_intr_stat, ext_intr_stat1); if (sdw_dma_irq_flag) return IRQ_WAKE_THREAD; if (irq_flag) return IRQ_HANDLED; else return IRQ_NONE; } #if IS_ENABLED(CONFIG_SND_SOC_AMD_SOUNDWIRE) static int acp_scan_sdw_devices(struct device *dev, u64 addr) { struct acpi_device *sdw_dev; struct acp63_dev_data *acp_data; acp_data = dev_get_drvdata(dev); if (!addr) return -ENODEV; sdw_dev = acpi_find_child_device(ACPI_COMPANION(dev), addr, 0); if (!sdw_dev) return -ENODEV; acp_data->info.handle = sdw_dev->handle; acp_data->info.count = AMD_SDW_MAX_MANAGERS; return amd_sdw_scan_controller(&acp_data->info); } static int amd_sdw_probe(struct device *dev) { struct acp63_dev_data *acp_data; struct sdw_amd_res sdw_res; int ret; acp_data = dev_get_drvdata(dev); memset(&sdw_res, 0, sizeof(sdw_res)); sdw_res.addr = acp_data->addr; sdw_res.reg_range = acp_data->reg_range; sdw_res.handle = acp_data->info.handle; sdw_res.parent = dev; sdw_res.dev = dev; sdw_res.acp_lock = &acp_data->acp_lock; sdw_res.count = acp_data->info.count; sdw_res.mmio_base = acp_data->acp63_base; sdw_res.acp_rev = acp_data->acp_rev; sdw_res.link_mask = acp_data->info.link_mask; ret = sdw_amd_probe(&sdw_res, &acp_data->sdw); if (ret) dev_err(dev, "error: SoundWire probe failed\n"); return ret; } static int amd_sdw_exit(struct acp63_dev_data *acp_data) { if (acp_data->sdw) sdw_amd_exit(acp_data->sdw); acp_data->sdw = NULL; return 0; } static struct snd_soc_acpi_mach *acp63_sdw_machine_select(struct device *dev) { struct snd_soc_acpi_mach *mach; const struct snd_soc_acpi_link_adr *link; struct acp63_dev_data *acp_data = dev_get_drvdata(dev); int ret, i; if (acp_data->info.count) { ret = sdw_amd_get_slave_info(acp_data->sdw); if (ret) { dev_dbg(dev, "failed to read slave information\n"); return NULL; } for (mach = acp_data->machines; mach; mach++) { if (!mach->links) break; link = mach->links; for (i = 0; i < acp_data->info.count && link->num_adr; link++, i++) { if (!snd_soc_acpi_sdw_link_slaves_found(dev, link, acp_data->sdw->peripherals)) break; } if (i == acp_data->info.count || !link->num_adr) break; } if (mach && mach->link_mask) { mach->mach_params.links = mach->links; mach->mach_params.link_mask = mach->link_mask; mach->mach_params.subsystem_rev = acp_data->acp_rev; return mach; } } dev_dbg(dev, "No SoundWire machine driver found\n"); return NULL; } #else static int acp_scan_sdw_devices(struct device *dev, u64 addr) { return 0; } static int amd_sdw_probe(struct device *dev) { return 0; } static int amd_sdw_exit(struct acp63_dev_data *acp_data) { return 0; } static struct snd_soc_acpi_mach *acp63_sdw_machine_select(struct device *dev) { return NULL; } #endif static int acp63_machine_register(struct device *dev) { struct snd_soc_acpi_mach *mach; struct acp63_dev_data *adata = dev_get_drvdata(dev); int size; if (adata->is_sdw_dev && adata->is_sdw_config) { size = sizeof(*adata->machines); mach = acp63_sdw_machine_select(dev); if (mach) { adata->mach_dev = platform_device_register_data(dev, mach->drv_name, PLATFORM_DEVID_NONE, mach, size); if (IS_ERR(adata->mach_dev)) { dev_err(dev, "cannot register Machine device for SoundWire Interface\n"); return PTR_ERR(adata->mach_dev); } } } else if (adata->is_pdm_dev && !adata->is_sdw_dev && adata->is_pdm_config) { adata->mach_dev = platform_device_register_data(dev, "acp_ps_mach", PLATFORM_DEVID_NONE, NULL, 0); if (IS_ERR(adata->mach_dev)) { dev_err(dev, "cannot register amd_ps_mach device\n"); return PTR_ERR(adata->mach_dev); } } return 0; } static int get_acp63_device_config(struct pci_dev *pci, struct acp63_dev_data *acp_data) { struct acpi_device *pdm_dev; const union acpi_object *obj; acpi_handle handle; acpi_integer dmic_status; bool is_dmic_dev = false; bool is_sdw_dev = false; bool wov_en, dmic_en; int ret; /* IF WOV entry not found, enable dmic based on acp-audio-device-type entry*/ wov_en = true; dmic_en = false; acp_hw_get_config(pci, acp_data); if (acp_data->is_pdm_config) { pdm_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), ACP63_DMIC_ADDR, 0); if (pdm_dev) { /* is_dmic_dev flag will be set when ACP PDM controller device exists */ if (!acpi_dev_get_property(pdm_dev, "acp-audio-device-type", ACPI_TYPE_INTEGER, &obj) && obj->integer.value == ACP_DMIC_DEV) dmic_en = true; } handle = ACPI_HANDLE(&pci->dev); ret = acpi_evaluate_integer(handle, "_WOV", NULL, &dmic_status); if (!ACPI_FAILURE(ret)) wov_en = dmic_status; } if (dmic_en && wov_en) is_dmic_dev = true; if (acp_data->is_sdw_config) { ret = acp_scan_sdw_devices(&pci->dev, ACP63_SDW_ADDR); if (!ret && acp_data->info.link_mask) is_sdw_dev = true; } acp_data->is_pdm_dev = is_dmic_dev; acp_data->is_sdw_dev = is_sdw_dev; if (!is_dmic_dev && !is_sdw_dev) { dev_dbg(&pci->dev, "No PDM or SoundWire manager devices found\n"); return -ENODEV; } return 0; } static void acp63_fill_platform_dev_info(struct platform_device_info *pdevinfo, struct device *parent, struct fwnode_handle *fw_node, char *name, unsigned int id, const struct resource *res, unsigned int num_res, const void *data, size_t size_data) { pdevinfo->name = name; pdevinfo->id = id; pdevinfo->parent = parent; pdevinfo->num_res = num_res; pdevinfo->res = res; pdevinfo->data = data; pdevinfo->size_data = size_data; pdevinfo->fwnode = fw_node; } static int create_acp63_platform_devs(struct pci_dev *pci, struct acp63_dev_data *adata, u32 addr) { struct platform_device_info pdevinfo; struct device *parent; int ret; parent = &pci->dev; if (adata->is_sdw_dev || adata->is_pdm_dev) { adata->res = devm_kzalloc(&pci->dev, sizeof(struct resource), GFP_KERNEL); if (!adata->res) { ret = -ENOMEM; goto de_init; } adata->res->flags = IORESOURCE_MEM; adata->res->start = addr; adata->res->end = addr + (ACP63_REG_END - ACP63_REG_START); memset(&pdevinfo, 0, sizeof(pdevinfo)); } if (adata->is_pdm_dev && adata->is_pdm_config) { acp63_fill_platform_dev_info(&pdevinfo, parent, NULL, "acp_ps_pdm_dma", 0, adata->res, 1, NULL, 0); adata->pdm_dev = platform_device_register_full(&pdevinfo); if (IS_ERR(adata->pdm_dev)) { dev_err(&pci->dev, "cannot register %s device\n", pdevinfo.name); ret = PTR_ERR(adata->pdm_dev); goto de_init; } memset(&pdevinfo, 0, sizeof(pdevinfo)); acp63_fill_platform_dev_info(&pdevinfo, parent, NULL, "dmic-codec", 0, NULL, 0, NULL, 0); adata->dmic_codec_dev = platform_device_register_full(&pdevinfo); if (IS_ERR(adata->dmic_codec_dev)) { dev_err(&pci->dev, "cannot register %s device\n", pdevinfo.name); ret = PTR_ERR(adata->dmic_codec_dev); goto unregister_pdm_dev; } } if (adata->is_sdw_dev && adata->is_sdw_config) { ret = amd_sdw_probe(&pci->dev); if (ret) { if (adata->is_pdm_dev) goto unregister_dmic_codec_dev; else goto de_init; } memset(&pdevinfo, 0, sizeof(pdevinfo)); acp63_fill_platform_dev_info(&pdevinfo, parent, NULL, "amd_ps_sdw_dma", 0, adata->res, 1, NULL, 0); adata->sdw_dma_dev = platform_device_register_full(&pdevinfo); if (IS_ERR(adata->sdw_dma_dev)) { dev_err(&pci->dev, "cannot register %s device\n", pdevinfo.name); ret = PTR_ERR(adata->sdw_dma_dev); if (adata->is_pdm_dev) goto unregister_dmic_codec_dev; else goto de_init; } } return 0; unregister_dmic_codec_dev: platform_device_unregister(adata->dmic_codec_dev); unregister_pdm_dev: platform_device_unregister(adata->pdm_dev); de_init: if (acp_hw_deinit(adata, &pci->dev)) dev_err(&pci->dev, "ACP de-init failed\n"); return ret; } static int acp_hw_init_ops(struct acp63_dev_data *adata, struct pci_dev *pci) { adata->hw_ops = devm_kzalloc(&pci->dev, sizeof(struct acp_hw_ops), GFP_KERNEL); if (!adata->hw_ops) return -ENOMEM; switch (adata->acp_rev) { case ACP63_PCI_REV: acp63_hw_init_ops(adata->hw_ops); break; case ACP70_PCI_REV: case ACP71_PCI_REV: acp70_hw_init_ops(adata->hw_ops); break; default: dev_err(&pci->dev, "ACP device not found\n"); return -ENODEV; } return 0; } static int snd_acp63_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) { struct acp63_dev_data *adata; u32 addr; u32 irqflags, flag; int ret; irqflags = IRQF_SHARED; /* Return if acp config flag is defined */ flag = snd_amd_acp_find_config(pci); if (flag) return -ENODEV; /* ACP PCI revision id check for ACP6.3, ACP7.0 & ACP7.1 platforms */ switch (pci->revision) { case ACP63_PCI_REV: case ACP70_PCI_REV: case ACP71_PCI_REV: break; default: dev_dbg(&pci->dev, "acp63/acp70/acp71 pci device not found\n"); return -ENODEV; } if (pci_enable_device(pci)) { dev_err(&pci->dev, "pci_enable_device failed\n"); return -ENODEV; } ret = pci_request_regions(pci, "AMD ACP6.2 audio"); if (ret < 0) { dev_err(&pci->dev, "pci_request_regions failed\n"); goto disable_pci; } adata = devm_kzalloc(&pci->dev, sizeof(struct acp63_dev_data), GFP_KERNEL); if (!adata) { ret = -ENOMEM; goto release_regions; } addr = pci_resource_start(pci, 0); adata->acp63_base = devm_ioremap(&pci->dev, addr, pci_resource_len(pci, 0)); if (!adata->acp63_base) { ret = -ENOMEM; goto release_regions; } adata->addr = addr; adata->reg_range = ACP63_REG_END - ACP63_REG_START; adata->acp_rev = pci->revision; pci_set_master(pci); pci_set_drvdata(pci, adata); mutex_init(&adata->acp_lock); ret = acp_hw_init_ops(adata, pci); if (ret) { dev_err(&pci->dev, "ACP hw ops init failed\n"); goto release_regions; } ret = acp_hw_init(adata, &pci->dev); if (ret) goto release_regions; ret = devm_request_threaded_irq(&pci->dev, pci->irq, acp63_irq_handler, acp63_irq_thread, irqflags, "ACP_PCI_IRQ", adata); if (ret) { dev_err(&pci->dev, "ACP PCI IRQ request failed\n"); goto de_init; } ret = get_acp63_device_config(pci, adata); /* ACP PCI driver probe should be continued even PDM or SoundWire Devices are not found */ if (ret) { dev_dbg(&pci->dev, "get acp device config failed:%d\n", ret); goto skip_pdev_creation; } ret = create_acp63_platform_devs(pci, adata, addr); if (ret < 0) { dev_err(&pci->dev, "ACP platform devices creation failed\n"); goto de_init; } if (adata->acp_rev >= ACP70_PCI_REV) adata->machines = snd_soc_acpi_amd_acp70_sdw_machines; else adata->machines = snd_soc_acpi_amd_acp63_sdw_machines; ret = acp63_machine_register(&pci->dev); if (ret) { dev_err(&pci->dev, "ACP machine register failed\n"); goto de_init; } skip_pdev_creation: device_set_wakeup_enable(&pci->dev, true); pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS); pm_runtime_use_autosuspend(&pci->dev); pm_runtime_put_noidle(&pci->dev); pm_runtime_allow(&pci->dev); return 0; de_init: if (acp_hw_deinit(adata, &pci->dev)) dev_err(&pci->dev, "ACP de-init failed\n"); release_regions: pci_release_regions(pci); disable_pci: pci_disable_device(pci); return ret; } static int snd_acp_suspend(struct device *dev) { return acp_hw_suspend(dev); } static int snd_acp_runtime_resume(struct device *dev) { return acp_hw_runtime_resume(dev); } static int snd_acp_resume(struct device *dev) { return acp_hw_resume(dev); } static const struct dev_pm_ops acp63_pm_ops = { RUNTIME_PM_OPS(snd_acp_suspend, snd_acp_runtime_resume, NULL) SYSTEM_SLEEP_PM_OPS(snd_acp_suspend, snd_acp_resume) }; static void snd_acp63_remove(struct pci_dev *pci) { struct acp63_dev_data *adata; int ret; adata = pci_get_drvdata(pci); if (adata->sdw) { amd_sdw_exit(adata); platform_device_unregister(adata->sdw_dma_dev); } if (adata->is_pdm_dev) { platform_device_unregister(adata->pdm_dev); platform_device_unregister(adata->dmic_codec_dev); } if (adata->mach_dev) platform_device_unregister(adata->mach_dev); ret = acp_hw_deinit(adata, &pci->dev); if (ret) dev_err(&pci->dev, "ACP de-init failed\n"); pm_runtime_forbid(&pci->dev); pm_runtime_get_noresume(&pci->dev); pci_release_regions(pci); pci_disable_device(pci); } static const struct pci_device_id snd_acp63_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID), .class = PCI_CLASS_MULTIMEDIA_OTHER << 8, .class_mask = 0xffffff }, { 0, }, }; MODULE_DEVICE_TABLE(pci, snd_acp63_ids); static struct pci_driver ps_acp63_driver = { .name = KBUILD_MODNAME, .id_table = snd_acp63_ids, .probe = snd_acp63_probe, .remove = snd_acp63_remove, .driver = { .pm = pm_ptr(&acp63_pm_ops), } }; module_pci_driver(ps_acp63_driver); MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); MODULE_AUTHOR("Syed.SabaKareem@amd.com"); MODULE_DESCRIPTION("AMD common ACP PCI driver for ACP6.3, ACP7.0 & ACP7.1 platforms"); MODULE_IMPORT_NS("SOUNDWIRE_AMD_INIT"); MODULE_IMPORT_NS("SND_AMD_SOUNDWIRE_ACPI"); MODULE_LICENSE("GPL v2");