ASoC: Intel: catpt: Simple sysfs attributes

Add sysfs entries for displaying version of FW currently in use as well
as dumping full FW information including build and log-providers hashes.
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200929141247.8058-10-cezary.rojewski@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/ABI/testing/sysfs-bus-pci-devices-catpt

+What:		/sys/devices/pci0000:00/<dev>/fw_version
+Date:		September 2020
+Contact:	Cezary Rojewski <cezary.rojewski@intel.com>
+Description:
+		Version of AudioDSP firmware ASoC catpt driver is
+		communicating with.
+		Format: %d.%d.%d.%d, type:major:minor:build.
+
+What:		/sys/devices/pci0000:00/<dev>/fw_info
+Date:		September 2020
+Contact:	Cezary Rojewski <cezary.rojewski@intel.com>
+Description:
+		Detailed AudioDSP firmware build information including
+		build hash and log-providers hash. This information is
+		obtained during initial handshake with firmware.
+		Format: %s.

sound/soc/intel/catpt/core.h

@@ -15,6 +15,8 @@
 
 struct catpt_dev;
 
+extern const struct attribute_group *catpt_attr_groups[];
+
 void catpt_sram_init(struct resource *sram, u32 start, u32 size);
 void catpt_sram_free(struct resource *sram);
 struct resource *

sound/soc/intel/catpt/device.c

@@ -342,6 +342,7 @@ static struct platform_driver catpt_acpi_driver = {
 		.name = "intel_catpt",
 		.acpi_match_table = catpt_ids,
 		.pm = &catpt_dev_pm,
+		.dev_groups = catpt_attr_groups,
 	},
 };
 module_platform_driver(catpt_acpi_driver);

sound/soc/intel/catpt/sysfs.c

+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2020 Intel Corporation. All rights reserved.
+//
+// Author: Cezary Rojewski <cezary.rojewski@intel.com>
+//
+
+#include <linux/pm_runtime.h>
+#include "core.h"
+
+static ssize_t fw_version_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct catpt_dev *cdev = dev_get_drvdata(dev);
+	struct catpt_fw_version version;
+	int ret;
+
+	pm_runtime_get_sync(cdev->dev);
+
+	ret = catpt_ipc_get_fw_version(cdev, &version);
+
+	pm_runtime_mark_last_busy(cdev->dev);
+	pm_runtime_put_autosuspend(cdev->dev);
+
+	if (ret)
+		return CATPT_IPC_ERROR(ret);
+
+	return sprintf(buf, "%d.%d.%d.%d\n", version.type, version.major,
+		       version.minor, version.build);
+}
+static DEVICE_ATTR_RO(fw_version);
+
+static ssize_t fw_info_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct catpt_dev *cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", cdev->ipc.config.fw_info);
+}
+static DEVICE_ATTR_RO(fw_info);
+
+static struct attribute *catpt_attrs[] = {
+	&dev_attr_fw_version.attr,
+	&dev_attr_fw_info.attr,
+	NULL
+};
+
+static const struct attribute_group catpt_attr_group = {
+	.attrs = catpt_attrs,
+};
+
+const struct attribute_group *catpt_attr_groups[] = {
+	&catpt_attr_group,
+	NULL
+};