hp-wmi: add support for reporting tablet state

diff -puN drivers/platform/x86/hp-wmi.c~hp-wmi-add-support-for-reporting-tablet-state drivers/platform/x86/hp-wmi.c
@@ -47,7 +47,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE9
 #define HPWMI_DISPLAY_QUERY 0x1
 #define HPWMI_HDDTEMP_QUERY 0x2
 #define HPWMI_ALS_QUERY 0x3
-#define HPWMI_DOCK_QUERY 0x4
+#define HPWMI_HARDWARE_QUERY 0x4
 #define HPWMI_WIRELESS_QUERY 0x5
 #define HPWMI_HOTKEY_QUERY 0xc
 

@@ -75,10 +75,9 @@ struct key_entry {
 	u16 keycode;
 };
 
-enum { KE_KEY, KE_SW, KE_END };
+enum { KE_KEY, KE_END };
 
 static struct key_entry hp_wmi_keymap[] = {
-	{KE_SW, 0x01, SW_DOCK},
 	{KE_KEY, 0x02, KEY_BRIGHTNESSUP},
 	{KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
 	{KE_KEY, 0x20e6, KEY_PROG1},

@@ -151,7 +150,22 @@ static int hp_wmi_als_state(void)
 
 static int hp_wmi_dock_state(void)
 {
-	return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
+	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
+
+	if (ret < 0)
+		return ret;
+
+	return ret & 0x1;
+}
+
+static int hp_wmi_tablet_state(void)
+{
+	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
+
+	if (ret < 0)
+		return ret;
+
+	return (ret & 0x4) ? 1 : 0;
 }
 
 static int hp_wmi_set_block(void *data, bool blocked)

@@ -232,6 +246,15 @@ static ssize_t show_dock(struct device *
 	return sprintf(buf, "%d\n", value);
 }
 
+static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	int value = hp_wmi_tablet_state();
+	if (value < 0)
+		return -EINVAL;
+	return sprintf(buf, "%d\n", value);
+}
+
 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 		       const char *buf, size_t count)
 {

@@ -244,6 +267,7 @@ static DEVICE_ATTR(display, S_IRUGO, sho
 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
+static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 
 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 {

@@ -326,13 +350,13 @@ static void hp_wmi_notify(u32 value, voi
 						 key->keycode, 0);
 				input_sync(hp_wmi_input_dev);
 				break;
-			case KE_SW:
-				input_report_switch(hp_wmi_input_dev,
-						    key->keycode,
-						    hp_wmi_dock_state());
-				input_sync(hp_wmi_input_dev);
-				break;
 			}
+		} else if (eventcode == 0x1) {
+			input_report_switch(hp_wmi_input_dev, SW_DOCK,
+					    hp_wmi_dock_state());
+			input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
+					    hp_wmi_tablet_state());
+			input_sync(hp_wmi_input_dev);
 		} else if (eventcode == 0x5) {
 			if (wifi_rfkill)
 				rfkill_set_sw_state(wifi_rfkill,

@@ -369,18 +393,19 @@ static int __init hp_wmi_input_setup(voi
 			set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 			set_bit(key->keycode, hp_wmi_input_dev->keybit);
 			break;
-		case KE_SW:
-			set_bit(EV_SW, hp_wmi_input_dev->evbit);
-			set_bit(key->keycode, hp_wmi_input_dev->swbit);
-
-			/* Set initial dock state */
-			input_report_switch(hp_wmi_input_dev, key->keycode,
-					    hp_wmi_dock_state());
-			input_sync(hp_wmi_input_dev);
-			break;
 		}
 	}
 
+	set_bit(EV_SW, hp_wmi_input_dev->evbit);
+	set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
+	set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
+
+	/* Set initial hardware state */
+	input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
+	input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
+			    hp_wmi_tablet_state());
+	input_sync(hp_wmi_input_dev);
+
 	err = input_register_device(hp_wmi_input_dev);
 
 	if (err) {

@@ -397,6 +422,7 @@ static void cleanup_sysfs(struct platfor
 	device_remove_file(&device->dev, &dev_attr_hddtemp);
 	device_remove_file(&device->dev, &dev_attr_als);
 	device_remove_file(&device->dev, &dev_attr_dock);
+	device_remove_file(&device->dev, &dev_attr_tablet);
 }
 
 static int __init hp_wmi_bios_setup(struct platform_device *device)

@@ -416,6 +442,9 @@ static int __init hp_wmi_bios_setup(stru
 	err = device_create_file(&device->dev, &dev_attr_dock);
 	if (err)
 		goto add_sysfs_error;
+	err = device_create_file(&device->dev, &dev_attr_tablet);
+	if (err)
+		goto add_sysfs_error;
 
 	if (wireless & 0x1) {
 		wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,

@@ -485,23 +514,17 @@ static int __exit hp_wmi_bios_remove(str
 
 static int hp_wmi_resume_handler(struct platform_device *device)
 {
-	struct key_entry *key;
-
 	/*
-	 * Docking state may have changed while suspended, so trigger
-	 * an input event for the current state. As this is a switch,
+	 * Hardware state may have changed while suspended, so trigger
+	 * input events for the current state. As this is a switch,
 	 * the input layer will only actually pass it on if the state
 	 * changed.
 	 */
-	for (key = hp_wmi_keymap; key->type != KE_END; key++) {
-		switch (key->type) {
-		case KE_SW:
-			input_report_switch(hp_wmi_input_dev, key->keycode,
-					    hp_wmi_dock_state());
-			input_sync(hp_wmi_input_dev);
-			break;
-		}
-	}
+
+	input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
+	input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
+			    hp_wmi_tablet_state());
+	input_sync(hp_wmi_input_dev);
 
 	return 0;
 }