ASoC: SOF: Make creation of machine device from SOF core optional

Currently, SOF probes machine drivers by creating a platform device
and passing the machine description as private data.

This is driven by the ACPI restrictions. Ideally, ACPI tables
should contain the description for the machine driver. This is
not possible because ACPI tables are frozen and used on multiple
OS-es (e.g Windows).

In the case of Device Tree we don't have this restriction, so we
choose to probe the machine drivers by creating a DT node as is
the standard ALSA way.

This patch makes the probing of machine drivers from SOF
core optional allowing for Device Tree platforms to decouple
the SOF core from machine driver probing.

Along with this, it also consolidates the machine driver selection
for Intel platforms by defining optional ops for selecting the machine
driver based on the ACPI match for HDA and non-HDA platforms and
setting the mach params.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191204211556.12671-11-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 3 insertions, 56 deletions

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 9832322adbec..e258f6a8e7a5 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -92,47 +92,9 @@ out:
 }
 EXPORT_SYMBOL(snd_sof_get_status);
 
-/*
- * SOF Driver enumeration.
- */
-static int sof_machine_check(struct snd_sof_dev *sdev)
-{
-	struct snd_sof_pdata *plat_data = sdev->pdata;
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_NOCODEC)
-	struct snd_soc_acpi_mach *machine;
-	int ret;
-#endif
-
-	if (plat_data->machine)
-		return 0;
-
-#if !IS_ENABLED(CONFIG_SND_SOC_SOF_NOCODEC)
-	dev_err(sdev->dev, "error: no matching ASoC machine driver found - aborting probe\n");
-	return -ENODEV;
-#else
-	/* fallback to nocodec mode */
-	dev_warn(sdev->dev, "No ASoC machine driver found - using nocodec\n");
-	machine = devm_kzalloc(sdev->dev, sizeof(*machine), GFP_KERNEL);
-	if (!machine)
-		return -ENOMEM;
-
-	ret = sof_nocodec_setup(sdev->dev, plat_data, machine,
-				plat_data->desc, plat_data->desc->ops);
-	if (ret < 0)
-		return ret;
-
-	plat_data->machine = machine;
-
-	return 0;
-#endif
-}
-
 static int sof_probe_continue(struct snd_sof_dev *sdev)
 {
 	struct snd_sof_pdata *plat_data = sdev->pdata;
-	const char *drv_name;
-	const void *mach;
-	int size;
 	int ret;
 
 	/* probe the DSP hardware */
@@ -218,22 +180,9 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
 		goto fw_run_err;
 	}
 
-	drv_name = plat_data->machine->drv_name;
-	mach = (const void *)plat_data->machine;
-	size = sizeof(*plat_data->machine);
-
-	/* register machine driver, pass machine info as pdata */
-	plat_data->pdev_mach =
-		platform_device_register_data(sdev->dev, drv_name,
-					      PLATFORM_DEVID_NONE, mach, size);
-
-	if (IS_ERR(plat_data->pdev_mach)) {
-		ret = PTR_ERR(plat_data->pdev_mach);
+	ret = snd_sof_machine_register(sdev, plat_data);
+	if (ret < 0)
 		goto fw_run_err;
-	}
-
-	dev_dbg(sdev->dev, "created machine %s\n",
-		dev_name(&plat_data->pdev_mach->dev));
 
 	/*
 	 * Some platforms in SOF, ex: BYT, may not have their platform PM
@@ -363,9 +312,7 @@ int snd_sof_device_remove(struct device *dev)
 	 * will remove the component driver and unload the topology
 	 * before freeing the snd_card.
 	 */
-	if (!IS_ERR_OR_NULL(pdata->pdev_mach))
-		platform_device_unregister(pdata->pdev_mach);
-
+	snd_sof_machine_unregister(sdev, pdata);
 	/*
 	 * Unregistering the machine driver results in unloading the topology.
 	 * Some widgets, ex: scheduler, attempt to power down the core they are