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Jones" To: hdegoede@redhat.com Cc: corentin.chary@gmail.com, mgross@linux.intel.com, jdelvare@suse.com, linux@roeck-us.net, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, "Luke D. Jones" Subject: [PATCH 1/3] asus-wmi: Add panel overdrive functionality Date: Mon, 5 Jul 2021 10:21:46 +1200 Message-Id: <20210704222148.880848-2-luke@ljones.dev> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210704222148.880848-1-luke@ljones.dev> References: <20210704222148.880848-1-luke@ljones.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some ASUS ROG laptops have the ability to drive the display panel a a higher rate to eliminate or reduce ghosting. Signed-off-by: Luke D. Jones --- drivers/platform/x86/asus-wmi.c | 92 ++++++++++++++++++++++ include/linux/platform_data/x86/asus-wmi.h | 1 + 2 files changed, 93 insertions(+) diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index ebaeb7bb80f5..2468076d6cd8 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -216,6 +216,9 @@ struct asus_wmi { // The RSOC controls the maximum charging percentage. bool battery_rsoc_available; + bool panel_overdrive_available; + u8 panel_overdrive; + struct hotplug_slot hotplug_slot; struct mutex hotplug_lock; struct mutex wmi_lock; @@ -1221,6 +1224,87 @@ static int asus_wmi_rfkill_init(struct asus_wmi *asus) return result; } +/* Panel Overdrive ************************************************************/ +static int panel_od_check_present(struct asus_wmi *asus) +{ + u32 result; + int err; + + asus->panel_overdrive_available = false; + + err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_PANEL_OD, &result); + if (err) { + if (err == -ENODEV) + return 0; + return err; + } + + if (result & ASUS_WMI_DSTS_PRESENCE_BIT) + asus->panel_overdrive_available = true; + asus->panel_overdrive = result & ASUS_WMI_DSTS_STATUS_BIT; + + return 0; +} + +static int panel_od_write(struct asus_wmi *asus) +{ + int err; + u8 value; + u32 retval; + + value = asus->panel_overdrive; + + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_PANEL_OD, value, &retval); + + sysfs_notify(&asus->platform_device->dev.kobj, NULL, + "panel_od"); + + if (err) { + pr_warn("Failed to set panel overdrive: %d\n", err); + return err; + } + + if (retval > 1 || retval < 0) { + pr_warn("Failed to set panel overdrive (retval): 0x%x\n", + retval); + return -EIO; + } + + return 0; +} + +static ssize_t panel_od_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct asus_wmi *asus = dev_get_drvdata(dev); + u8 mode = asus->panel_overdrive; + + return scnprintf(buf, PAGE_SIZE, "%d\n", mode); +} + +static ssize_t panel_od_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int result; + u8 overdrive; + struct asus_wmi *asus = dev_get_drvdata(dev); + + result = kstrtou8(buf, 10, &overdrive); + if (result < 0) + return result; + + if (overdrive > 1 || overdrive < 0) + return -EINVAL; + + asus->panel_overdrive = overdrive; + panel_od_write(asus); + + return count; +} + +static DEVICE_ATTR_RW(panel_od); + /* Quirks *********************************************************************/ static void asus_wmi_set_xusb2pr(struct asus_wmi *asus) @@ -2332,6 +2416,7 @@ static struct attribute *platform_attributes[] = { &dev_attr_als_enable.attr, &dev_attr_fan_boost_mode.attr, &dev_attr_throttle_thermal_policy.attr, + &dev_attr_panel_od.attr, NULL }; @@ -2357,6 +2442,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj, ok = asus->fan_boost_mode_available; else if (attr == &dev_attr_throttle_thermal_policy.attr) ok = asus->throttle_thermal_policy_available; + else if (attr == &dev_attr_panel_od.attr) + ok = asus->panel_overdrive_available; if (devid != -1) ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0); @@ -2622,6 +2709,10 @@ static int asus_wmi_add(struct platform_device *pdev) else throttle_thermal_policy_set_default(asus); + err = panel_od_check_present(asus); + if (err) + goto fail_panel_od; + err = asus_wmi_sysfs_init(asus->platform_device); if (err) goto fail_sysfs; @@ -2709,6 +2800,7 @@ static int asus_wmi_add(struct platform_device *pdev) fail_throttle_thermal_policy: fail_fan_boost_mode: fail_platform: +fail_panel_od: kfree(asus); return err; } diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h index 2f274cf52805..428aea701c7b 100644 --- a/include/linux/platform_data/x86/asus-wmi.h +++ b/include/linux/platform_data/x86/asus-wmi.h @@ -61,6 +61,7 @@ #define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075 /* Misc */ +#define ASUS_WMI_DEVID_PANEL_OD 0x00050019 #define ASUS_WMI_DEVID_CAMERA 0x00060013 #define ASUS_WMI_DEVID_LID_FLIP 0x00060062 -- 2.31.1