v4.19.13 snapshot.
diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c
new file mode 100644
index 0000000..5eea6fe
--- /dev/null
+++ b/drivers/hid/hid-elo.c
@@ -0,0 +1,314 @@
+/*
+ * HID driver for ELO usb touchscreen 4000/4500
+ *
+ * Copyright (c) 2013 Jiri Slaby
+ *
+ * Data parsing taken from elousb driver by Vojtech Pavlik.
+ *
+ * This driver is licensed under the terms of GPLv2.
+ */
+
+#include <linux/hid.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/workqueue.h>
+
+#include "hid-ids.h"
+
+#define ELO_PERIODIC_READ_INTERVAL HZ
+#define ELO_SMARTSET_CMD_TIMEOUT 2000 /* msec */
+
+/* Elo SmartSet commands */
+#define ELO_FLUSH_SMARTSET_RESPONSES 0x02 /* Flush all pending smartset responses */
+#define ELO_SEND_SMARTSET_COMMAND 0x05 /* Send a smartset command */
+#define ELO_GET_SMARTSET_RESPONSE 0x06 /* Get a smartset response */
+#define ELO_DIAG 0x64 /* Diagnostics command */
+#define ELO_SMARTSET_PACKET_SIZE 8
+
+struct elo_priv {
+ struct usb_device *usbdev;
+ struct delayed_work work;
+ unsigned char buffer[ELO_SMARTSET_PACKET_SIZE];
+};
+
+static struct workqueue_struct *wq;
+static bool use_fw_quirk = true;
+module_param(use_fw_quirk, bool, S_IRUGO);
+MODULE_PARM_DESC(use_fw_quirk, "Do periodic pokes for broken M firmwares (default = true)");
+
+static int elo_input_configured(struct hid_device *hdev,
+ struct hid_input *hidinput)
+{
+ struct input_dev *input = hidinput->input;
+
+ /*
+ * ELO devices have one Button usage in GenDesk field, which makes
+ * hid-input map it to BTN_LEFT; that confuses userspace, which then
+ * considers the device to be a mouse/touchpad instead of touchscreen.
+ */
+ clear_bit(BTN_LEFT, input->keybit);
+ set_bit(BTN_TOUCH, input->keybit);
+ set_bit(ABS_PRESSURE, input->absbit);
+ input_set_abs_params(input, ABS_PRESSURE, 0, 256, 0, 0);
+
+ return 0;
+}
+
+static void elo_process_data(struct input_dev *input, const u8 *data, int size)
+{
+ int press;
+
+ input_report_abs(input, ABS_X, (data[3] << 8) | data[2]);
+ input_report_abs(input, ABS_Y, (data[5] << 8) | data[4]);
+
+ press = 0;
+ if (data[1] & 0x80)
+ press = (data[7] << 8) | data[6];
+ input_report_abs(input, ABS_PRESSURE, press);
+
+ if (data[1] & 0x03) {
+ input_report_key(input, BTN_TOUCH, 1);
+ input_sync(input);
+ }
+
+ if (data[1] & 0x04)
+ input_report_key(input, BTN_TOUCH, 0);
+
+ input_sync(input);
+}
+
+static int elo_raw_event(struct hid_device *hdev, struct hid_report *report,
+ u8 *data, int size)
+{
+ struct hid_input *hidinput;
+
+ if (!(hdev->claimed & HID_CLAIMED_INPUT) || list_empty(&hdev->inputs))
+ return 0;
+
+ hidinput = list_first_entry(&hdev->inputs, struct hid_input, list);
+
+ switch (report->id) {
+ case 0:
+ if (data[0] == 'T') { /* Mandatory ELO packet marker */
+ elo_process_data(hidinput->input, data, size);
+ return 1;
+ }
+ break;
+ default: /* unknown report */
+ /* Unknown report type; pass upstream */
+ hid_info(hdev, "unknown report type %d\n", report->id);
+ break;
+ }
+
+ return 0;
+}
+
+static int elo_smartset_send_get(struct usb_device *dev, u8 command,
+ void *data)
+{
+ unsigned int pipe;
+ u8 dir;
+
+ if (command == ELO_SEND_SMARTSET_COMMAND) {
+ pipe = usb_sndctrlpipe(dev, 0);
+ dir = USB_DIR_OUT;
+ } else if (command == ELO_GET_SMARTSET_RESPONSE) {
+ pipe = usb_rcvctrlpipe(dev, 0);
+ dir = USB_DIR_IN;
+ } else
+ return -EINVAL;
+
+ return usb_control_msg(dev, pipe, command,
+ dir | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0, 0, data, ELO_SMARTSET_PACKET_SIZE,
+ ELO_SMARTSET_CMD_TIMEOUT);
+}
+
+static int elo_flush_smartset_responses(struct usb_device *dev)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ ELO_FLUSH_SMARTSET_RESPONSES,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
+}
+
+static void elo_work(struct work_struct *work)
+{
+ struct elo_priv *priv = container_of(work, struct elo_priv, work.work);
+ struct usb_device *dev = priv->usbdev;
+ unsigned char *buffer = priv->buffer;
+ int ret;
+
+ ret = elo_flush_smartset_responses(dev);
+ if (ret < 0) {
+ dev_err(&dev->dev, "initial FLUSH_SMARTSET_RESPONSES failed, error %d\n",
+ ret);
+ goto fail;
+ }
+
+ /* send Diagnostics command */
+ *buffer = ELO_DIAG;
+ ret = elo_smartset_send_get(dev, ELO_SEND_SMARTSET_COMMAND, buffer);
+ if (ret < 0) {
+ dev_err(&dev->dev, "send Diagnostics Command failed, error %d\n",
+ ret);
+ goto fail;
+ }
+
+ /* get the result */
+ ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE, buffer);
+ if (ret < 0) {
+ dev_err(&dev->dev, "get Diagnostics Command response failed, error %d\n",
+ ret);
+ goto fail;
+ }
+
+ /* read the ack */
+ if (*buffer != 'A') {
+ ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE,
+ buffer);
+ if (ret < 0) {
+ dev_err(&dev->dev, "get acknowledge response failed, error %d\n",
+ ret);
+ goto fail;
+ }
+ }
+
+fail:
+ ret = elo_flush_smartset_responses(dev);
+ if (ret < 0)
+ dev_err(&dev->dev, "final FLUSH_SMARTSET_RESPONSES failed, error %d\n",
+ ret);
+ queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL);
+}
+
+/*
+ * Not all Elo devices need the periodic HID descriptor reads.
+ * Only firmware version M needs this.
+ */
+static bool elo_broken_firmware(struct usb_device *dev)
+{
+ struct usb_device *hub = dev->parent;
+ struct usb_device *child = NULL;
+ u16 fw_lvl = le16_to_cpu(dev->descriptor.bcdDevice);
+ u16 child_vid, child_pid;
+ int i;
+
+ if (!use_fw_quirk)
+ return false;
+ if (fw_lvl != 0x10d)
+ return false;
+
+ /* iterate sibling devices of the touch controller */
+ usb_hub_for_each_child(hub, i, child) {
+ child_vid = le16_to_cpu(child->descriptor.idVendor);
+ child_pid = le16_to_cpu(child->descriptor.idProduct);
+
+ /*
+ * If one of the devices below is present attached as a sibling of
+ * the touch controller then this is a newer IBM 4820 monitor that
+ * does not need the IBM-requested workaround if fw level is
+ * 0x010d - aka 'M'.
+ * No other HW can have this combination.
+ */
+ if (child_vid==0x04b3) {
+ switch (child_pid) {
+ case 0x4676: /* 4820 21x Video */
+ case 0x4677: /* 4820 51x Video */
+ case 0x4678: /* 4820 2Lx Video */
+ case 0x4679: /* 4820 5Lx Video */
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ struct elo_priv *priv;
+ int ret;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&priv->work, elo_work);
+ priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
+
+ hid_set_drvdata(hdev, priv);
+
+ ret = hid_parse(hdev);
+ if (ret) {
+ hid_err(hdev, "parse failed\n");
+ goto err_free;
+ }
+
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+ if (ret) {
+ hid_err(hdev, "hw start failed\n");
+ goto err_free;
+ }
+
+ if (elo_broken_firmware(priv->usbdev)) {
+ hid_info(hdev, "broken firmware found, installing workaround\n");
+ queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL);
+ }
+
+ return 0;
+err_free:
+ kfree(priv);
+ return ret;
+}
+
+static void elo_remove(struct hid_device *hdev)
+{
+ struct elo_priv *priv = hid_get_drvdata(hdev);
+
+ hid_hw_stop(hdev);
+ cancel_delayed_work_sync(&priv->work);
+ kfree(priv);
+}
+
+static const struct hid_device_id elo_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0009), },
+ { HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0030), },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, elo_devices);
+
+static struct hid_driver elo_driver = {
+ .name = "elo",
+ .id_table = elo_devices,
+ .probe = elo_probe,
+ .remove = elo_remove,
+ .raw_event = elo_raw_event,
+ .input_configured = elo_input_configured,
+};
+
+static int __init elo_driver_init(void)
+{
+ int ret;
+
+ wq = create_singlethread_workqueue("elousb");
+ if (!wq)
+ return -ENOMEM;
+
+ ret = hid_register_driver(&elo_driver);
+ if (ret)
+ destroy_workqueue(wq);
+
+ return ret;
+}
+module_init(elo_driver_init);
+
+static void __exit elo_driver_exit(void)
+{
+ hid_unregister_driver(&elo_driver);
+ destroy_workqueue(wq);
+}
+module_exit(elo_driver_exit);
+
+MODULE_AUTHOR("Jiri Slaby <jslaby@suse.cz>");
+MODULE_LICENSE("GPL");