linux-imx

/*

 * 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]);