--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ALSA driver for ACPI-based HDA Controllers.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+
+#include <sound/hda_codec.h>
+
+#include "hda_controller.h"
+
+struct hda_acpi {
+ struct azx azx;
+ struct snd_card *card;
+ struct platform_device *pdev;
+ void __iomem *regs;
+ struct work_struct probe_work;
+ const struct hda_data *data;
+};
+
+/**
+ * struct hda_data - Optional device-specific data
+ * @short_name: Used for the ALSA card name; defaults to KBUILD_MODNAME
+ * @long_name: Used for longer description; defaults to short_name
+ * @flags: Passed to &azx->driver_caps
+ *
+ * A pointer to a record of this type may be stored in the
+ * &acpi_device_id->driver_data field of an ACPI match table entry in order to
+ * customize the naming and behavior of a particular device. All fields are
+ * optional and sensible defaults will be selected in their absence.
+ */
+struct hda_data {
+ const char *short_name;
+ const char *long_name;
+ unsigned long flags;
+};
+
+static int hda_acpi_dev_disconnect(struct snd_device *device)
+{
+ struct azx *chip = device->device_data;
+
+ chip->bus.shutdown = 1;
+ return 0;
+}
+
+static int hda_acpi_dev_free(struct snd_device *device)
+{
+ struct azx *azx = device->device_data;
+ struct hda_acpi *hda = container_of(azx, struct hda_acpi, azx);
+
+ cancel_work_sync(&hda->probe_work);
+ if (azx_bus(azx)->chip_init) {
+ azx_stop_all_streams(azx);
+ azx_stop_chip(azx);
+ }
+
+ azx_free_stream_pages(azx);
+ azx_free_streams(azx);
+ snd_hdac_bus_exit(azx_bus(azx));
+
+ return 0;
+}
+
+static int hda_acpi_init(struct hda_acpi *hda)
+{
+ struct hdac_bus *bus = azx_bus(&hda->azx);
+ struct snd_card *card = hda->azx.card;
+ struct device *dev = &hda->pdev->dev;
+ struct azx *azx = &hda->azx;
+ struct resource *res;
+ unsigned short gcap;
+ const char *sname, *lname;
+ int err, irq;
+
+ /* The base address for the HDA registers and the interrupt are wrapped
+ * in an ACPI _CRS object which can be parsed by platform_get_irq() and
+ * devm_platform_get_and_ioremap_resource()
+ */
+
+ irq = platform_get_irq(hda->pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ hda->regs = devm_platform_get_and_ioremap_resource(hda->pdev, 0, &res);
+ if (IS_ERR(hda->regs))
+ return PTR_ERR(hda->regs);
+
+ bus->remap_addr = hda->regs;
+ bus->addr = res->start;
+
+ err = devm_request_irq(dev, irq, azx_interrupt,
+ IRQF_SHARED, KBUILD_MODNAME, azx);
+ if (err) {
+ dev_err(dev, "unable to request IRQ %d, disabling device\n",
+ irq);
+ return err;
+ }
+ bus->irq = irq;
+ bus->dma_stop_delay = 100;
+ card->sync_irq = bus->irq;
+
+ gcap = azx_readw(azx, GCAP);
+ dev_dbg(dev, "chipset global capabilities = 0x%x\n", gcap);
+
+ azx->align_buffer_size = 1;
+
+ azx->capture_streams = (gcap >> 8) & 0x0f;
+ azx->playback_streams = (gcap >> 12) & 0x0f;
+
+ azx->capture_index_offset = 0;
+ azx->playback_index_offset = azx->capture_streams;
+ azx->num_streams = azx->playback_streams + azx->capture_streams;
+
+ err = azx_init_streams(azx);
+ if (err < 0) {
+ dev_err(dev, "failed to initialize streams: %d\n", err);
+ return err;
+ }
+
+ err = azx_alloc_stream_pages(azx);
+ if (err < 0) {
+ dev_err(dev, "failed to allocate stream pages: %d\n", err);
+ return err;
+ }
+
+ azx_init_chip(azx, 1);
+
+ if (!bus->codec_mask) {
+ dev_err(dev, "no codecs found!\n");
+ return -ENODEV;
+ }
+
+ strscpy(card->driver, "hda-acpi");
+
+ sname = hda->data->short_name ? hda->data->short_name : KBUILD_MODNAME;
+
+ if (strlen(sname) > sizeof(card->shortname))
+ dev_info(dev, "truncating shortname for card %s\n", sname);
+ strscpy(card->shortname, sname);
+
+ lname = hda->data->long_name ? hda->data->long_name : sname;
+
+ snprintf(card->longname, sizeof(card->longname),
+ "%s at 0x%lx irq %i", lname, bus->addr, bus->irq);
+
+ return 0;
+}
+
+static void hda_acpi_probe_work(struct work_struct *work)
+{
+ struct hda_acpi *hda = container_of(work, struct hda_acpi, probe_work);
+ struct azx *chip = &hda->azx;
+ int err;
+
+ err = hda_acpi_init(hda);
+ if (err < 0)
+ return;
+
+ err = azx_probe_codecs(chip, 8);
+ if (err < 0)
+ return;
+
+ err = azx_codec_configure(chip);
+ if (err < 0)
+ return;
+
+ err = snd_card_register(chip->card);
+ if (err < 0)
+ return;
+
+ chip->running = 1;
+}
+
+static int hda_acpi_create(struct hda_acpi *hda)
+{
+ static const struct snd_device_ops ops = {
+ .dev_disconnect = hda_acpi_dev_disconnect,
+ .dev_free = hda_acpi_dev_free,
+ };
+ static const struct hda_controller_ops null_ops;
+ struct azx *azx = &hda->azx;
+ int err;
+
+ mutex_init(&azx->open_mutex);
+ azx->card = hda->card;
+ INIT_LIST_HEAD(&azx->pcm_list);
+
+ azx->ops = &null_ops;
+ azx->driver_caps = hda->data->flags;
+ azx->driver_type = hda->data->flags & 0xff;
+ azx->codec_probe_mask = -1;
+
+ err = azx_bus_init(azx, NULL);
+ if (err < 0)
+ return err;
+
+ err = snd_device_new(hda->card, SNDRV_DEV_LOWLEVEL, &hda->azx, &ops);
+ if (err < 0) {
+ dev_err(&hda->pdev->dev, "Error creating device\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static int hda_acpi_probe(struct platform_device *pdev)
+{
+ struct hda_acpi *hda;
+ int err;
+
+ hda = devm_kzalloc(&pdev->dev, sizeof(*hda), GFP_KERNEL);
+ if (!hda)
+ return -ENOMEM;
+
+ hda->pdev = pdev;
+ hda->data = acpi_device_get_match_data(&pdev->dev);
+
+ /* Fall back to defaults if the table didn't have a *struct hda_data */
+ if (!hda->data)
+ hda->data = devm_kzalloc(&pdev->dev, sizeof(*hda->data),
+ GFP_KERNEL);
+ if (!hda->data)
+ return -ENOMEM;
+
+ err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, 0, &hda->card);
+ if (err < 0) {
+ dev_err(&pdev->dev, "Error creating card!\n");
+ return err;
+ }
+
+ INIT_WORK(&hda->probe_work, hda_acpi_probe_work);
+
+ err = hda_acpi_create(hda);
+ if (err < 0)
+ goto out_free;
+ hda->card->private_data = &hda->azx;
+
+ dev_set_drvdata(&pdev->dev, hda->card);
+
+ schedule_work(&hda->probe_work);
+
+ return 0;
+
+out_free:
+ snd_card_free(hda->card);
+ return err;
+}
+
+static void hda_acpi_remove(struct platform_device *pdev)
+{
+ snd_card_free(dev_get_drvdata(&pdev->dev));
+}
+
+static void hda_acpi_shutdown(struct platform_device *pdev)
+{
+ struct snd_card *card = dev_get_drvdata(&pdev->dev);
+ struct azx *chip;
+
+ if (!card)
+ return;
+ chip = card->private_data;
+ if (chip && chip->running)
+ azx_stop_chip(chip);
+}
+
+static int hda_acpi_suspend(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ int rc;
+
+ rc = pm_runtime_force_suspend(dev);
+ if (rc < 0)
+ return rc;
+ snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+
+ return 0;
+}
+
+static int hda_acpi_resume(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ int rc;
+
+ rc = pm_runtime_force_resume(dev);
+ if (rc < 0)
+ return rc;
+ snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+
+ return 0;
+}
+
+static const struct dev_pm_ops hda_acpi_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(hda_acpi_suspend, hda_acpi_resume)
+};
+
+struct hda_data nvidia_hda_data = {
+ .short_name = "NVIDIA",
+ .long_name = "NVIDIA HDA Controller",
+ .flags = AZX_DCAPS_CORBRP_SELF_CLEAR,
+};
+
+static const struct acpi_device_id hda_acpi_match[] = {
+ { .id = "NVDA2014", .driver_data = (uintptr_t) &nvidia_hda_data },
+ { .id = "NVDA2015", .driver_data = (uintptr_t) &nvidia_hda_data },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, hda_acpi_match);
+
+static struct platform_driver hda_acpi_platform_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .pm = &hda_acpi_pm,
+ .acpi_match_table = hda_acpi_match,
+ },
+ .probe = hda_acpi_probe,
+ .remove = hda_acpi_remove,
+ .shutdown = hda_acpi_shutdown,
+};
+module_platform_driver(hda_acpi_platform_driver);
+
+MODULE_DESCRIPTION("Driver for ACPI-based HDA Controllers");
+MODULE_LICENSE("GPL");
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