linux: Parse HID_FIRMWARE_VERSION from uevent for release_number

Parse the HID_FIRMWARE_VERSION uevent property to populate release_number
for all HID devices. This provides device version information for I2C,
Bluetooth, SPI, and virtual HID devices.

For USB devices, the existing bcdDevice lookup from sysfs still takes
precedence, maintaining backward compatibility.

The HID_FIRMWARE_VERSION property is being added to the Linux kernel
(patch series submitted to linux-input@vger.kernel.org). On kernels
without this property, release_number will remain 0 for non-USB devices,
preserving existing behavior.

Link: https://lore.kernel.org/linux-input/  [kernel patch series]
Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

linux/hid.c

@@ -571,7 +571,8 @@ static int get_hid_report_descriptor_from_hidraw(hid_device *dev, struct hidraw_
  */
 static int parse_uevent_info(const char *uevent, unsigned *bus_type,
 	unsigned short *vendor_id, unsigned short *product_id,
-	char **serial_number_utf8, char **product_name_utf8)
+	char **serial_number_utf8, char **product_name_utf8,
+	unsigned short *version)
 {
 	char tmp[1024];
 
@@ -622,6 +623,9 @@ static int parse_uevent_info(const char *uevent, unsigned *bus_type,
 			/* The caller has to free the serial number */
 			*serial_number_utf8 = strdup(value);
 			found_serial = 1;
+		} else if (strcmp(key, "HID_FIRMWARE_VERSION") == 0) {
+			/* Device version from kernel */
+			*version = (unsigned short)strtol(value, NULL, 16);
 		}
 
 next_line:
@@ -648,6 +652,7 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 	char *serial_number_utf8 = NULL;
 	char *product_name_utf8 = NULL;
 	unsigned bus_type;
+	unsigned short hid_version = 0;
 	int result;
 	struct hidraw_report_descriptor report_desc;
 
@@ -670,7 +675,8 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 		&dev_vid,
 		&dev_pid,
 		&serial_number_utf8,
-		&product_name_utf8);
+		&product_name_utf8,
+		&hid_version);
 
 	if (!result) {
 		/* parse_uevent_info() failed for at least one field. */
@@ -709,7 +715,7 @@ static struct hid_device_info * create_device_info_for_device(struct udev_device
 	cur_dev->serial_number = utf8_to_wchar_t(serial_number_utf8);
 
 	/* Release Number */
-	cur_dev->release_number = 0x0;
+	cur_dev->release_number = hid_version;
 
 	/* Interface Number */
 	cur_dev->interface_number = -1;