/*
* HID driver for N-Trig touchscreens
*
* Copyright (c) 2008-2010 Rafi Rubin
* Copyright (c) 2009-2010 Stephane Chatty
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/usb.h>
#include "usbhid/usbhid.h"
#include <linux/module.h>
#include <linux/slab.h>
#include "hid-ids.h"
#define NTRIG_DUPLICATE_USAGES 0x001
static unsigned int min_width;
module_param(min_width, uint, 0644);
MODULE_PARM_DESC(min_width, "Minimum touch contact width to accept.");
static unsigned int min_height;
module_param(min_height, uint, 0644);
MODULE_PARM_DESC(min_height, "Minimum touch contact height to accept.");
static unsigned int activate_slack = 1;
module_param(activate_slack, uint, 0644);
MODULE_PARM_DESC(activate_slack, "Number of touch frames to ignore at "
"the start of touch input.");
static unsigned int deactivate_slack = 4;
module_param(deactivate_slack, uint, 0644);
MODULE_PARM_DESC(deactivate_slack, "Number of empty frames to ignore before "
"deactivating touch.");
static unsigned int activation_width = 64;
module_param(activation_width, uint, 0644);
MODULE_PARM_DESC(activation_width, "Width threshold to immediately start "
"processing touch events.");
static unsigned int activation_height = 32;
module_param(activation_height, uint, 0644);
MODULE_PARM_DESC(activation_height, "Height threshold to immediately start "
"processing touch events.");
struct ntrig_data {
/* Incoming raw values for a single contact */
__u16 x, y, w, h;
__u16 id;
bool tipswitch;
bool confidence;
bool first_contact_touch;
bool reading_mt;
__u8 mt_footer[4];
__u8 mt_foot_count;
/* The current activation state. */
__s8 act_state;
/* Empty frames to ignore before recognizing the end of activity */
__s8 deactivate_slack;
/* Frames to ignore before acknowledging the start of activity */
__s8 activate_slack;
/* Minimum size contact to accept */
__u16 min_width;
__u16 min_height;
/* Threshold to override activation slack */
__u16 activation_width;
__u16 activation_height;
__u16 sensor_logical_width;
__u16 sensor_logical_height;
__u16 sensor_physical_width;
__u16 sensor_physical_height;
};
/*
* This function converts the 4 byte raw firmware code into
* a string containing 5 comma separated numbers.
*/
static int ntrig_version_string(unsigned char *raw, char *buf)
{
__u8 a = (raw[1] & 0x0e) >> 1;
__u8 b = (raw[0] & 0x3c) >> 2;
__u8 c = ((raw[0] & 0x03) << 3) | ((raw[3] & 0xe0) >> 5);
__u8 d = ((raw[3] & 0x07) << 3) | ((raw[2] & 0xe0) >> 5);
__u8 e = raw[2] & 0x07;
/*
* As yet unmapped bits:
* 0b11000000 0b11110001 0b00011000 0b00011000
*/
return sprintf(buf, "%u.%u.%u.%u.%u", a, b, c, d, e);
}
static inline int ntrig_get_mode(struct hid_device *hdev)
{
struct hid_report *report = hdev->report_enum[HID_FEATURE_REPORT].
report_id_hash[0x0d];
if (!report || report->maxfield < 1 ||
report->field[0]->report_count < 1)
return -EINVAL;
hid_hw_request(hdev, report, HID_REQ_GET_REPORT);
hid_hw_wait(hdev);
return (int)report->field[0]->value[0];
}
static inline void ntrig_set_mode(struct hid_device *hdev, const int mode)
{
struct hid_report *report;
__u8 mode_commands[4] = { 0xe, 0xf, 0x1b, 0x10 };
if (mode < 0 || mode > 3)
return;
report = hdev->report_enum[HID_FEATURE_REPORT].
report_id_hash[mode_commands[mode]];
if (!report)
return;
hid_hw_request(hdev, report, HID_REQ_GET_REPORT);
}
static void