[PATCH 2/5] platform/x86: msi-ec: Add fw version and release date attributes

[Nikita Kravets <teackot@gmail.com>]

Create a root attribute group and add the first platform device
attributes: firmware version and firmware release date. Firmware
version attribute uses an already present ec_get_firmware_version()
function. Both features are present on all supported laptops.

Cc: Aakash Singh <mail@singhaakash.dev>
Cc: Jose Angel Pastrana <japp0005@red.ujaen.es>
Signed-off-by: Nikita Kravets <teackot@gmail.com>
---
 drivers/platform/x86/msi-ec.c | 67 ++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/msi-ec.c b/drivers/platform/x86/msi-ec.c
index 12c559c9eac4..772b230fb47e 100644
--- a/drivers/platform/x86/msi-ec.c
+++ b/drivers/platform/x86/msi-ec.c
@@ -818,17 +818,82 @@ static struct acpi_battery_hook battery_hook = {
 	.name = MSI_EC_DRIVER_NAME,
 };
 
+/*
+ * Sysfs platform device attributes
+ */
+
+static ssize_t fw_version_show(struct device *device,
+			       struct device_attribute *attr, char *buf)
+{
+	u8 rdata[MSI_EC_FW_VERSION_LENGTH + 1];
+	int result;
+
+	result = ec_get_firmware_version(rdata);
+	if (result < 0)
+		return result;
+
+	return sysfs_emit(buf, "%s\n", rdata);
+}
+
+static ssize_t fw_release_date_show(struct device *device,
+				    struct device_attribute *attr, char *buf)
+{
+	u8 rdate[MSI_EC_FW_DATE_LENGTH + 1];
+	u8 rtime[MSI_EC_FW_TIME_LENGTH + 1];
+	int result;
+	int year, month, day, hour, minute, second;
+
+	memset(rdate, 0, MSI_EC_FW_DATE_LENGTH + 1);
+	result = ec_read_seq(MSI_EC_FW_DATE_ADDRESS,
+			     rdate,
+			     MSI_EC_FW_DATE_LENGTH);
+	if (result < 0)
+		return result;
+
+	result = sscanf(rdate, "%02d%02d%04d", &month, &day, &year);
+	if (result != 3)
+		return -EINVAL;
+
+	memset(rtime, 0, MSI_EC_FW_TIME_LENGTH + 1);
+	result = ec_read_seq(MSI_EC_FW_TIME_ADDRESS,
+			     rtime,
+			     MSI_EC_FW_TIME_LENGTH);
+	if (result < 0)
+		return result;
+
+	result = sscanf(rtime, "%02d:%02d:%02d", &hour, &minute, &second);
+	if (result != 3)
+		return -EINVAL;
+
+	return sysfs_emit(buf, "%04d/%02d/%02d %02d:%02d:%02d\n", year, month, day,
+			  hour, minute, second);
+}
+
+static DEVICE_ATTR_RO(fw_version);
+static DEVICE_ATTR_RO(fw_release_date);
+
+static struct attribute *msi_root_attrs[] = {
+	&dev_attr_fw_version.attr,
+	&dev_attr_fw_release_date.attr,
+	NULL
+};
+
+static struct attribute_group msi_root_group = {
+	.attrs = msi_root_attrs,
+};
+
 /*
  * Sysfs platform driver
  */
 
 static int msi_platform_probe(struct platform_device *pdev)
 {
-	return 0;
+	return sysfs_create_group(&pdev->dev.kobj, &msi_root_group);
 }
 
 static int msi_platform_remove(struct platform_device *pdev)
 {
+	sysfs_remove_group(&pdev->dev.kobj, &msi_root_group);
 	return 0;
 }
 
-- 
2.42.0