[PATCH v9 09/14] ASoC: Intel: catpt: Simple sysfs attributes

[Cezary Rojewski <cezary.rojewski@intel.com>]

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>
---

Changes in v9:
- fixed newlines in sysfs as requested by Andy, left tags as no other
  changes done

Changes in v7:
- fixed licence header for fs.c
- renamed fs.c to sysfs.c to better match its purpose
- added documentation within Documentation/ABI/testing for entries
  exposed by catpt
- bin_attribute fw_build replaced by attribute fw_info:
  fw_info contains full FW information and after successful handshake,
  it's always available (stored in driver data) so no need to invoke
  GET_FW_VERSION IPC again, just dump the stored information
- rather than manually creating and removing sysfs files, now makes use
  of dev_groups member of struct device_driver 

Changes in v6:
- functions declaration and usage now part of this patch instead of
  being separated from it

Changes in v2:
- fixed size provided to memcpy() in fw_build_read() as reported by Mark

 .../ABI/testing/sysfs-bus-pci-devices-catpt   | 16 ++++++
 sound/soc/intel/catpt/core.h                  |  2 +
 sound/soc/intel/catpt/device.c                |  1 +
 sound/soc/intel/catpt/sysfs.c                 | 55 +++++++++++++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-pci-devices-catpt
 create mode 100644 sound/soc/intel/catpt/sysfs.c

diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-catpt b/Documentation/ABI/testing/sysfs-bus-pci-devices-catpt
new file mode 100644
index 000000000000..8a200f4eefbd
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-catpt
@@ -0,0 +1,16 @@
+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.
diff --git a/sound/soc/intel/catpt/core.h b/sound/soc/intel/catpt/core.h
index a29b4c0232cb..88dc3fb6306f 100644
--- a/sound/soc/intel/catpt/core.h
+++ b/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 *
diff --git a/sound/soc/intel/catpt/device.c b/sound/soc/intel/catpt/device.c
index 0d2dd919de8d..390ffb203de0 100644
--- a/sound/soc/intel/catpt/device.c
+++ b/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);
diff --git a/sound/soc/intel/catpt/sysfs.c b/sound/soc/intel/catpt/sysfs.c
new file mode 100644
index 000000000000..9579e233a15d
--- /dev/null
+++ b/sound/soc/intel/catpt/sysfs.c
@@ -0,0 +1,55 @@
+// 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
+};
-- 
2.17.1