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