[PATCH 5/5] platform/x86: msi-ec: Add a cooler boost attribute

[Nikita Kravets <teackot@gmail.com>]

Cooler boost increases the fan speed to improve the laptop cooling.
This is a simple on/off feature that is easy to test: if it works
you'll hear the fans spinning much faster. So far all supported models
have this feature represented by a single bit at the 0x98 EC address.
The attribute makes use of the previously added bit operation functions.

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 | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/platform/x86/msi-ec.c b/drivers/platform/x86/msi-ec.c
index ae73dcf01d09..f4e770b3dda1 100644
--- a/drivers/platform/x86/msi-ec.c
+++ b/drivers/platform/x86/msi-ec.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/seq_file.h>
 #include <linux/string.h>
+#include <linux/kstrtox.h>
 
 #define SM_ECO_NAME		"eco"
 #define SM_COMFORT_NAME		"comfort"
@@ -850,6 +851,35 @@ static struct acpi_battery_hook battery_hook = {
  * Sysfs platform device attributes
  */
 
+static ssize_t cooler_boost_show(struct device *device,
+				 struct device_attribute *attr, char *buf)
+{
+	int result;
+	bool value;
+
+	result = ec_check_bit(conf.cooler_boost.address, conf.cooler_boost.bit, &value);
+
+	return sysfs_emit(buf, "%s\n", value ? "on" : "off");
+}
+
+static ssize_t cooler_boost_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	int result;
+	bool value;
+
+	result = kstrtobool(buf, &value);
+	if (result)
+		return result;
+
+	result = ec_set_bit(conf.cooler_boost.address, conf.cooler_boost.bit, value);
+	if (result < 0)
+		return result;
+
+	return count;
+}
+
 static ssize_t fw_version_show(struct device *device,
 			       struct device_attribute *attr, char *buf)
 {
@@ -897,6 +927,7 @@ static ssize_t fw_release_date_show(struct device *device,
 			  hour, minute, second);
 }
 
+static DEVICE_ATTR_RW(cooler_boost);
 static DEVICE_ATTR_RO(fw_version);
 static DEVICE_ATTR_RO(fw_release_date);
 
@@ -922,6 +953,10 @@ static void filter_attributes(struct attribute_support *attributes,
 static int msi_platform_probe(struct platform_device *pdev)
 {
 	struct attribute_support root_attrs_support[] = {
+		{
+			&dev_attr_cooler_boost.attr,
+			conf.cooler_boost.address != MSI_EC_ADDR_UNSUPP,
+		},
 		{
 			&dev_attr_fw_version.attr,
 			true,
-- 
2.42.0