platform/x86: asus_wmi: Support throttle thermal policy

Throttle thermal policy ACPI device is used to control CPU cooling and
throttling. This patch adds sysfs entry for setting current mode and
Fn+F5 hotkey that switches to next.

Policy modes:
* 0x00 - default
* 0x01 - overboost
* 0x02 - silent

Signed-off-by: Leonid Maksymchuk <leonmaxx@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index 9e99f29096127227919d16afb5aa7f14317dfc1d..1efac0ddb417e0b04ffeeb11573eca9488147f06 100644 (file)
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -46,3 +46,13 @@ Description:
                        * 0 - normal,
                        * 1 - overboost,
                        * 2 - silent
+
+What:          /sys/devices/platform/<platform>/throttle_thermal_policy
+Date:          Dec 2019
+KernelVersion: 5.6
+Contact:       "Leonid Maksymchuk" <leonmaxx@gmail.com>
+Description:
+               Throttle thermal policy mode:
+                       * 0 - default,
+                       * 1 - overboost,
+                       * 2 - silent

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 821b08e01635760f3c38a4d1d42741358f876824..f10ec9d745e58b4b015c2a11f1e9de3049dc46fe 100644 (file)
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -61,6 +61,7 @@ MODULE_LICENSE("GPL");
 #define NOTIFY_KBD_BRTDWN              0xc5
 #define NOTIFY_KBD_BRTTOGGLE           0xc7
 #define NOTIFY_KBD_FBM                 0x99
+#define NOTIFY_KBD_TTP                 0xae
 
 #define ASUS_WMI_FNLOCK_BIOS_DISABLED  BIT(0)
 
@@ -81,6 +82,10 @@ MODULE_LICENSE("GPL");
 #define ASUS_FAN_BOOST_MODE_SILENT_MASK                0x02
 #define ASUS_FAN_BOOST_MODES_MASK              0x03
 
+#define ASUS_THROTTLE_THERMAL_POLICY_DEFAULT   0
+#define ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST 1
+#define ASUS_THROTTLE_THERMAL_POLICY_SILENT    2
+
 #define USB_INTEL_XUSB2PR              0xD0
 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI  0x9c31
 
@@ -198,6 +203,9 @@ struct asus_wmi {
        u8 fan_boost_mode_mask;
        u8 fan_boost_mode;
 
+       bool throttle_thermal_policy_available;
+       u8 throttle_thermal_policy_mode;
+
        // The RSOC controls the maximum charging percentage.
        bool battery_rsoc_available;
 
@@ -1724,6 +1732,98 @@ static ssize_t fan_boost_mode_store(struct device *dev,
 // Fan boost mode: 0 - normal, 1 - overboost, 2 - silent
 static DEVICE_ATTR_RW(fan_boost_mode);
 
+/* Throttle thermal policy ****************************************************/
+
+static int throttle_thermal_policy_check_present(struct asus_wmi *asus)
+{
+       u32 result;
+       int err;
+
+       asus->throttle_thermal_policy_available = false;
+
+       err = asus_wmi_get_devstate(asus,
+                                   ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
+                                   &result);
+       if (err) {
+               if (err == -ENODEV)
+                       return 0;
+               return err;
+       }
+
+       if (result & ASUS_WMI_DSTS_PRESENCE_BIT)
+               asus->throttle_thermal_policy_available = true;
+
+       return 0;
+}
+
+static int throttle_thermal_policy_write(struct asus_wmi *asus)
+{
+       int err;
+       u8 value;
+       u32 retval;
+
+       value = asus->throttle_thermal_policy_mode;
+
+       err = asus_wmi_set_devstate(ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
+                                   value, &retval);
+       if (err) {
+               pr_warn("Failed to set throttle thermal policy: %d\n", err);
+               return err;
+       }
+
+       if (retval != 1) {
+               pr_warn("Failed to set throttle thermal policy (retval): 0x%x\n",
+                       retval);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int throttle_thermal_policy_switch_next(struct asus_wmi *asus)
+{
+       u8 new_mode = asus->throttle_thermal_policy_mode + 1;
+
+       if (new_mode > ASUS_THROTTLE_THERMAL_POLICY_SILENT)
+               new_mode = ASUS_THROTTLE_THERMAL_POLICY_DEFAULT;
+
+       asus->throttle_thermal_policy_mode = new_mode;
+       return throttle_thermal_policy_write(asus);
+}
+
+static ssize_t throttle_thermal_policy_show(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
+{
+       struct asus_wmi *asus = dev_get_drvdata(dev);
+       u8 mode = asus->throttle_thermal_policy_mode;
+
+       return scnprintf(buf, PAGE_SIZE, "%d\n", mode);
+}
+
+static ssize_t throttle_thermal_policy_store(struct device *dev,
+                                   struct device_attribute *attr,
+                                   const char *buf, size_t count)
+{
+       int result;
+       u8 new_mode;
+       struct asus_wmi *asus = dev_get_drvdata(dev);
+
+       result = kstrtou8(buf, 10, &new_mode);
+       if (result < 0)
+               return result;
+
+       if (new_mode > ASUS_THROTTLE_THERMAL_POLICY_SILENT)
+               return -EINVAL;
+
+       asus->throttle_thermal_policy_mode = new_mode;
+       throttle_thermal_policy_write(asus);
+
+       return count;
+}
+
+// Throttle thermal policy: 0 - default, 1 - overboost, 2 - silent
+static DEVICE_ATTR_RW(throttle_thermal_policy);
+
 /* Backlight ******************************************************************/
 
 static int read_backlight_power(struct asus_wmi *asus)
@@ -2005,6 +2105,11 @@ static void asus_wmi_handle_event_code(int code, struct asus_wmi *asus)
                return;
        }
 
+       if (asus->throttle_thermal_policy_available && code == NOTIFY_KBD_TTP) {
+               throttle_thermal_policy_switch_next(asus);
+               return;
+       }
+
        if (is_display_toggle(code) && asus->driver->quirks->no_display_toggle)
                return;
 
@@ -2155,6 +2260,7 @@ static struct attribute *platform_attributes[] = {
        &dev_attr_lid_resume.attr,
        &dev_attr_als_enable.attr,
        &dev_attr_fan_boost_mode.attr,
+       &dev_attr_throttle_thermal_policy.attr,
        NULL
 };
 
@@ -2178,6 +2284,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
                devid = ASUS_WMI_DEVID_ALS_ENABLE;
        else if (attr == &dev_attr_fan_boost_mode.attr)
                ok = asus->fan_boost_mode_available;
+       else if (attr == &dev_attr_throttle_thermal_policy.attr)
+               ok = asus->throttle_thermal_policy_available;
 
        if (devid != -1)
                ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);
@@ -2437,6 +2545,10 @@ static int asus_wmi_add(struct platform_device *pdev)
        if (err)
                goto fail_fan_boost_mode;
 
+       err = throttle_thermal_policy_check_present(asus);
+       if (err)
+               goto fail_throttle_thermal_policy;
+
        err = asus_wmi_sysfs_init(asus->platform_device);
        if (err)
                goto fail_sysfs;
@@ -2521,6 +2633,7 @@ static int asus_wmi_add(struct platform_device *pdev)
 fail_input:
        asus_wmi_sysfs_exit(asus->platform_device);
 fail_sysfs:
+fail_throttle_thermal_policy:
 fail_fan_boost_mode:
 fail_platform:
        kfree(asus);

diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 60249e22e8441994d7b8f89c6d84ebc5e71994c7..d39fc658c3205c7456f116c7a692645bb897a342 100644 (file)
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -58,6 +58,7 @@
 #define ASUS_WMI_DEVID_LIGHT_SENSOR    0x00050022 /* ?? */
 #define ASUS_WMI_DEVID_LIGHTBAR                0x00050025
 #define ASUS_WMI_DEVID_FAN_BOOST_MODE  0x00110018
+#define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075
 
 /* Misc */
 #define ASUS_WMI_DEVID_CAMERA          0x00060013