diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
index 074a65ed17bb4d595d2b48f13e0d2e03c2267bc6..766bf26601163c37aebf265160b4d3d0ce09617f 100644
--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -71,6 +71,18 @@ static void input_leds_event(struct input_handle *handle, unsigned int type,
 {
 }
 
+static int input_leds_get_count(struct input_dev *dev)
+{
+	unsigned int led_code;
+	int count = 0;
+
+	for_each_set_bit(led_code, dev->ledbit, LED_CNT)
+		if (input_led_info[led_code].name)
+			count++;
+
+	return count;
+}
+
 static int input_leds_connect(struct input_handler *handler,
 			      struct input_dev *dev,
 			      const struct input_device_id *id)
@@ -81,7 +93,7 @@ static int input_leds_connect(struct input_handler *handler,
 	int led_no;
 	int error;
 
-	num_leds = bitmap_weight(dev->ledbit, LED_CNT);
+	num_leds = input_leds_get_count(dev);
 	if (!num_leds)
 		return -ENXIO;
 
@@ -112,7 +124,7 @@ static int input_leds_connect(struct input_handler *handler,
 		led->handle = &leds->handle;
 		led->code = led_code;
 
-		if (WARN_ON(!input_led_info[led_code].name))
+		if (!input_led_info[led_code].name)
 			continue;
 
 		led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s",
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index ce3d40004458c87392339472f654462fae7cf0bc..22b9ca901f4e96c22499ce9723c0d2bd897c6fbb 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -1167,7 +1167,7 @@ static int elantech_set_input_params(struct psmouse *psmouse)
 	struct input_dev *dev = psmouse->dev;
 	struct elantech_data *etd = psmouse->private;
 	unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
-	unsigned int x_res = 0, y_res = 0;
+	unsigned int x_res = 31, y_res = 31;
 
 	if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
 		return -1;
@@ -1232,8 +1232,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
 		/* For X to recognize me as touchpad. */
 		input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
 		input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
-		input_abs_set_res(dev, ABS_X, x_res);
-		input_abs_set_res(dev, ABS_Y, y_res);
 		/*
 		 * range of pressure and width is the same as v2,
 		 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
@@ -1246,8 +1244,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
 		input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
 		input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
 		input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
-		input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
-		input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
 		input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
 				     ETP_PMAX_V2, 0, 0);
 		/*
@@ -1259,6 +1255,13 @@ static int elantech_set_input_params(struct psmouse *psmouse)
 		break;
 	}
 
+	input_abs_set_res(dev, ABS_X, x_res);
+	input_abs_set_res(dev, ABS_Y, y_res);
+	if (etd->hw_version > 1) {
+		input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
+		input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
+	}
+
 	etd->y_max = y_max;
 	etd->width = width;
 
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index b4d12e29abff72008125c2406b3808cf174e0f71..e36162b28c2aae268166c2e735e318b793b9dfa8 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/input/mt.h>
@@ -34,6 +35,7 @@ struct goodix_ts_data {
 	int abs_y_max;
 	unsigned int max_touch_num;
 	unsigned int int_trigger_type;
+	bool rotated_screen;
 };
 
 #define GOODIX_MAX_HEIGHT		4096
@@ -60,6 +62,30 @@ static const unsigned long goodix_irq_flags[] = {
 	IRQ_TYPE_LEVEL_HIGH,
 };
 
+/*
+ * Those tablets have their coordinates origin at the bottom right
+ * of the tablet, as if rotated 180 degrees
+ */
+static const struct dmi_system_id rotated_screen[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+	{
+		.ident = "WinBook TW100",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
+		}
+	},
+	{
+		.ident = "WinBook TW700",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
+		},
+	},
+#endif
+	{}
+};
+
 /**
  * goodix_i2c_read - read data from a register of the i2c slave device.
  *
@@ -129,6 +155,11 @@ static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
 	int input_y = get_unaligned_le16(&coor_data[3]);
 	int input_w = get_unaligned_le16(&coor_data[5]);
 
+	if (ts->rotated_screen) {
+		input_x = ts->abs_x_max - input_x;
+		input_y = ts->abs_y_max - input_y;
+	}
+
 	input_mt_slot(ts->input_dev, id);
 	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
 	input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
@@ -223,6 +254,11 @@ static void goodix_read_config(struct goodix_ts_data *ts)
 		ts->abs_y_max = GOODIX_MAX_HEIGHT;
 		ts->max_touch_num = GOODIX_MAX_CONTACTS;
 	}
+
+	ts->rotated_screen = dmi_check_system(rotated_screen);
+	if (ts->rotated_screen)
+		dev_dbg(&ts->client->dev,
+			 "Applying '180 degrees rotated screen' quirk\n");
 }
 
 /**
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index f2c6c352c55af2d3bb4dbf243516b19b9c62a65a..2c41107240dec274e5ec34724a882d87189f0103 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -627,6 +627,9 @@ static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
 		goto err_out;
 	}
 
+	/* TSC-25 data sheet specifies a delay after the RESET command */
+	msleep(150);
+
 	/* set coordinate output rate */
 	buf[0] = buf[1] = 0xFF;
 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
index f58a196521a9a99fc3d4838b86db7aba4b7aca02..80285c71786ee58a85d268adb20ad283a1fd54a9 100644
--- a/drivers/input/touchscreen/zforce_ts.c
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -429,7 +429,7 @@ static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
 		goto unlock;
 	}
 
-	if (buf[PAYLOAD_LENGTH] == 0) {
+	if (buf[PAYLOAD_LENGTH] == 0 || buf[PAYLOAD_LENGTH] > FRAME_MAXSIZE) {
 		dev_err(&client->dev, "invalid payload length: %d\n",
 			buf[PAYLOAD_LENGTH]);
 		ret = -EIO;