merge upstream

synaptics-led/mouse/appletouch.c

@@ -916,15 +916,15 @@ static int atp_probe(struct usb_interface *iface,
 	set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
 	set_bit(BTN_LEFT, input_dev->keybit);
 
+	INIT_WORK(&dev->work, atp_reinit);
+
 	error = input_register_device(dev->input);
 	if (error)
 		goto err_free_buffer;
 
 	/* save our data pointer in this interface device */
 	usb_set_intfdata(iface, dev);
 
-	INIT_WORK(&dev->work, atp_reinit);
-
 	return 0;
 
  err_free_buffer:

synaptics-led/mouse/byd.c

@@ -191,7 +191,7 @@
 
 /*
  * The touchpad generates a mixture of absolute and relative packets, indicated
- * by the the last byte of each packet being set to one of the following:
+ * by the last byte of each packet being set to one of the following:
  */
 #define BYD_PACKET_ABSOLUTE			0xf8
 #define BYD_PACKET_RELATIVE			0x00

synaptics-led/mouse/elan_i2c_core.c

@@ -186,55 +186,21 @@ static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
 	return 0;
 }
 
-static int elan_enable_power(struct elan_tp_data *data)
+static int elan_set_power(struct elan_tp_data *data, bool on)
 {
 	int repeat = ETP_RETRY_COUNT;
 	int error;
 
-	error = regulator_enable(data->vcc);
-	if (error) {
-		dev_err(&data->client->dev,
-			"failed to enable regulator: %d\n", error);
-		return error;
-	}
-
 	do {
-		error = data->ops->power_control(data->client, true);
+		error = data->ops->power_control(data->client, on);
 		if (error >= 0)
 			return 0;
 
 		msleep(30);
 	} while (--repeat > 0);
 
-	dev_err(&data->client->dev, "failed to enable power: %d\n", error);
-	return error;
-}
-
-static int elan_disable_power(struct elan_tp_data *data)
-{
-	int repeat = ETP_RETRY_COUNT;
-	int error;
-
-	do {
-		error = data->ops->power_control(data->client, false);
-		if (!error) {
-			error = regulator_disable(data->vcc);
-			if (error) {
-				dev_err(&data->client->dev,
-					"failed to disable regulator: %d\n",
-					error);
-				/* Attempt to power the chip back up */
-				data->ops->power_control(data->client, true);
-				break;
-			}
-
-			return 0;
-		}
-
-		msleep(30);
-	} while (--repeat > 0);
-
-	dev_err(&data->client->dev, "failed to disable power: %d\n", error);
+	dev_err(&data->client->dev, "failed to set power %s: %d\n",
+		on ? "on" : "off", error);
 	return error;
 }
 
@@ -1399,9 +1365,19 @@ static int __maybe_unused elan_suspend(struct device *dev)
 		/* Enable wake from IRQ */
 		data->irq_wake = (enable_irq_wake(client->irq) == 0);
 	} else {
-		ret = elan_disable_power(data);
+		ret = elan_set_power(data, false);
+		if (ret)
+			goto err;
+
+		ret = regulator_disable(data->vcc);
+		if (ret) {
+			dev_err(dev, "error %d disabling regulator\n", ret);
+			/* Attempt to power the chip back up */
+			elan_set_power(data, true);
+		}
 	}
 
+err:
 	mutex_unlock(&data->sysfs_mutex);
 	return ret;
 }
@@ -1412,12 +1388,18 @@ static int __maybe_unused elan_resume(struct device *dev)
 	struct elan_tp_data *data = i2c_get_clientdata(client);
 	int error;
 
-	if (device_may_wakeup(dev) && data->irq_wake) {
+	if (!device_may_wakeup(dev)) {
+		error = regulator_enable(data->vcc);
+		if (error) {
+			dev_err(dev, "error %d enabling regulator\n", error);
+			goto err;
+		}
+	} else if (data->irq_wake) {
 		disable_irq_wake(client->irq);
 		data->irq_wake = false;
 	}
 
-	error = elan_enable_power(data);
+	error = elan_set_power(data, true);
 	if (error) {
 		dev_err(dev, "power up when resuming failed: %d\n", error);
 		goto err;

synaptics-led/mouse/elantech.c

@@ -517,6 +517,19 @@ static void elantech_report_trackpoint(struct psmouse *psmouse,
 	case 0x16008020U:
 	case 0x26800010U:
 	case 0x36808000U:
+
+		/*
+		 * This firmware misreport coordinates for trackpoint
+		 * occasionally. Discard packets outside of [-127, 127] range
+		 * to prevent cursor jumps.
+		 */
+		if (packet[4] == 0x80 || packet[5] == 0x80 ||
+		    packet[1] >> 7 == packet[4] >> 7 ||
+		    packet[2] >> 7 == packet[5] >> 7) {
+			elantech_debug("discarding packet [%6ph]\n", packet);
+			break;
+
+		}
 		x = packet[4] - (int)((packet[1]^0x80) << 1);
 		y = (int)((packet[2]^0x80) << 1) - packet[5];
 
@@ -1575,7 +1588,13 @@ static const struct dmi_system_id no_hw_res_dmi_table[] = {
  */
 static int elantech_change_report_id(struct psmouse *psmouse)
 {
-	unsigned char param[2] = { 0x10, 0x03 };
+	/*
+	 * NOTE: the code is expecting to receive param[] as an array of 3
+	 * items (see __ps2_command()), even if in this case only 2 are
+	 * actually needed. Make sure the array size is 3 to avoid potential
+	 * stack out-of-bound accesses.
+	 */
+	unsigned char param[3] = { 0x10, 0x03 };
 
 	if (elantech_write_reg_params(psmouse, 0x7, param) ||
 	    elantech_read_reg_params(psmouse, 0x7, param) ||

synaptics-led/mouse/psmouse-smbus.c

@@ -75,6 +75,8 @@ static void psmouse_smbus_detach_i2c_client(struct i2c_client *client)
 				    "Marking SMBus companion %s as gone\n",
 				    dev_name(&smbdev->client->dev));
 			smbdev->dead = true;
+			device_link_remove(&smbdev->client->dev,
+					   &smbdev->psmouse->ps2dev.serio->dev);
 			serio_rescan(smbdev->psmouse->ps2dev.serio);
 		} else {
 			list_del(&smbdev->node);
@@ -174,6 +176,8 @@ static void psmouse_smbus_disconnect(struct psmouse *psmouse)
 		kfree(smbdev);
 	} else {
 		smbdev->dead = true;
+		device_link_remove(&smbdev->client->dev,
+				   &psmouse->ps2dev.serio->dev);
 		psmouse_dbg(smbdev->psmouse,
 			    "posting removal request for SMBus companion %s\n",
 			    dev_name(&smbdev->client->dev));
@@ -270,6 +274,12 @@ int psmouse_smbus_init(struct psmouse *psmouse,
 
 	if (smbdev->client) {
 		/* We have our companion device */
+		if (!device_link_add(&smbdev->client->dev,
+				     &psmouse->ps2dev.serio->dev,
+				     DL_FLAG_STATELESS))
+			psmouse_warn(psmouse,
+				     "failed to set up link with iSMBus companion %s\n",
+				     dev_name(&smbdev->client->dev));
 		return 0;
 	}