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kernel/drivers/hid/hid-ntrig.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for N-Trig touchscreens
*
* Copyright (c) 2008-2010 Rafi Rubin
* Copyright (c) 2009-2010 Stephane Chatty
*/
/*
*/
#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 ntrig_report_version(struct hid_device *hdev)
{
int ret;
char buf[20];
struct usb_device *usb_dev = hid_to_usb_dev(hdev);
unsigned char *data = kmalloc(8, GFP_KERNEL);
if (!data)
goto err_free;
ret = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
USB_REQ_CLEAR_FEATURE,
USB_TYPE_CLASS | USB_RECIP_INTERFACE |
USB_DIR_IN,
0x30c, 1, data, 8,
USB_CTRL_SET_TIMEOUT);
if (ret == 8) {
ret = ntrig_version_string(&data[2], buf);
hid_info(hdev, "Firmware version: %s (%02x%02x %02x%02x)\n",
buf, data[2], data[3], data[4], data[5]);
}
err_free:
kfree(data);
}
static ssize_t show_phys_width(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->sensor_physical_width);
}
static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL);
static ssize_t show_phys_height(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->sensor_physical_height);
}
static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL);
static ssize_t show_log_width(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->sensor_logical_width);
}
static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL);
static ssize_t show_log_height(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->sensor_logical_height);
}
static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL);
static ssize_t show_min_width(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->min_width *
nd->sensor_physical_width /
nd->sensor_logical_width);
}
static ssize_t set_min_width(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > nd->sensor_physical_width)
return -EINVAL;
nd->min_width = val * nd->sensor_logical_width /
nd->sensor_physical_width;
return count;
}
static DEVICE_ATTR(min_width, S_IWUSR | S_IRUGO, show_min_width, set_min_width);
static ssize_t show_min_height(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->min_height *
nd->sensor_physical_height /
nd->sensor_logical_height);
}
static ssize_t set_min_height(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > nd->sensor_physical_height)
return -EINVAL;
nd->min_height = val * nd->sensor_logical_height /
nd->sensor_physical_height;
return count;
}
static DEVICE_ATTR(min_height, S_IWUSR | S_IRUGO, show_min_height,
set_min_height);
static ssize_t show_activate_slack(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->activate_slack);
}
static ssize_t set_activate_slack(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > 0x7f)
return -EINVAL;
nd->activate_slack = val;
return count;
}
static DEVICE_ATTR(activate_slack, S_IWUSR | S_IRUGO, show_activate_slack,
set_activate_slack);
static ssize_t show_activation_width(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->activation_width *
nd->sensor_physical_width /
nd->sensor_logical_width);
}
static ssize_t set_activation_width(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > nd->sensor_physical_width)
return -EINVAL;
nd->activation_width = val * nd->sensor_logical_width /
nd->sensor_physical_width;
return count;
}
static DEVICE_ATTR(activation_width, S_IWUSR | S_IRUGO, show_activation_width,
set_activation_width);
static ssize_t show_activation_height(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", nd->activation_height *
nd->sensor_physical_height /
nd->sensor_logical_height);
}
static ssize_t set_activation_height(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > nd->sensor_physical_height)
return -EINVAL;
nd->activation_height = val * nd->sensor_logical_height /
nd->sensor_physical_height;
return count;
}
static DEVICE_ATTR(activation_height, S_IWUSR | S_IRUGO,
show_activation_height, set_activation_height);
static ssize_t show_deactivate_slack(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
return sprintf(buf, "%d\n", -nd->deactivate_slack);
}
static ssize_t set_deactivate_slack(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct ntrig_data *nd = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
/*
* No more than 8 terminal frames have been observed so far
* and higher slack is highly likely to leave the single
* touch emulation stuck down.
*/
if (val > 7)
return -EINVAL;
nd->deactivate_slack = -val;
return count;
}
static DEVICE_ATTR(deactivate_slack, S_IWUSR | S_IRUGO, show_deactivate_slack,
set_deactivate_slack);
static struct attribute *sysfs_attrs[] = {
&dev_attr_sensor_physical_width.attr,
&dev_attr_sensor_physical_height.attr,
&dev_attr_sensor_logical_width.attr,
&dev_attr_sensor_logical_height.attr,
&dev_attr_min_height.attr,
&dev_attr_min_width.attr,
&dev_attr_activate_slack.attr,
&dev_attr_activation_width.attr,
&dev_attr_activation_height.attr,
&dev_attr_deactivate_slack.attr,
NULL
};
static const struct attribute_group ntrig_attribute_group = {
.attrs = sysfs_attrs
};
/*
* this driver is aimed at two firmware versions in circulation:
* - dual pen/finger single touch
* - finger multitouch, pen not working
*/
static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
struct ntrig_data *nd = hid_get_drvdata(hdev);
/* No special mappings needed for the pen and single touch */
if (field->physical)
return 0;
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
input_set_abs_params(hi->input, ABS_X,
field->logical_minimum,
field->logical_maximum, 0, 0);
if (!nd->sensor_logical_width) {
nd->sensor_logical_width =
field->logical_maximum -
field->logical_minimum;
nd->sensor_physical_width =
field->physical_maximum -
field->physical_minimum;
nd->activation_width = activation_width *
nd->sensor_logical_width /
nd->sensor_physical_width;
nd->min_width = min_width *
nd->sensor_logical_width /
nd->sensor_physical_width;
}
return 1;
case HID_GD_Y:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(hi->input, ABS_Y,
field->logical_minimum,
field->logical_maximum, 0, 0);
if (!nd->sensor_logical_height) {
nd->sensor_logical_height =
field->logical_maximum -
field->logical_minimum;
nd->sensor_physical_height =
field->physical_maximum -
field->physical_minimum;
nd->activation_height = activation_height *
nd->sensor_logical_height /
nd->sensor_physical_height;
nd->min_height = min_height *
nd->sensor_logical_height /
nd->sensor_physical_height;
}
return 1;
}
return 0;
case HID_UP_DIGITIZER:
switch (usage->hid) {
/* we do not want to map these for now */
case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
case HID_DG_INPUTMODE:
case HID_DG_DEVICEINDEX:
case HID_DG_CONTACTMAX:
return -1;
/* width/height mapped on TouchMajor/TouchMinor/Orientation */
case HID_DG_WIDTH:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MAJOR);
return 1;
case HID_DG_HEIGHT:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MINOR);
input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
0, 1, 0, 0);
return 1;
}
return 0;
case 0xff000000:
/* we do not want to map these: no input-oriented meaning */
return -1;
}
return 0;
}
static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
/* No special mappings needed for the pen and single touch */
if (field->physical)
return 0;
if (usage->type == EV_KEY || usage->type == EV_REL
|| usage->type == EV_ABS)
clear_bit(usage->code, *bit);
return 0;
}
/*
* this function is called upon all reports
* so that we can filter contact point information,
* decide whether we are in multi or single touch mode
* and call input_mt_sync after each point if necessary
*/
static int ntrig_event (struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct ntrig_data *nd = hid_get_drvdata(hid);
struct input_dev *input;
/* Skip processing if not a claimed input */
if (!(hid->claimed & HID_CLAIMED_INPUT))
goto not_claimed_input;
/* This function is being called before the structures are fully
* initialized */
if(!(field->hidinput && field->hidinput->input))
return -EINVAL;
input = field->hidinput->input;
/* No special handling needed for the pen */
if (field->application == HID_DG_PEN)
return 0;
switch (usage->hid) {
case 0xff000001:
/* Tag indicating the start of a multitouch group */
nd->reading_mt = true;
nd->first_contact_touch = false;
break;
case HID_DG_TIPSWITCH:
nd->tipswitch = value;
/* Prevent emission of touch until validated */
return 1;
case HID_DG_CONFIDENCE:
nd->confidence = value;
break;
case HID_GD_X:
nd->x = value;
/* Clear the contact footer */
nd->mt_foot_count = 0;
break;
case HID_GD_Y:
nd->y = value;
break;
case HID_DG_CONTACTID:
nd->id = value;
break;
case HID_DG_WIDTH:
nd->w = value;
break;
case HID_DG_HEIGHT:
nd->h = value;
/*
* when in single touch mode, this is the last
* report received in a finger event. We want
* to emit a normal (X, Y) position
*/
if (!nd->reading_mt) {
/*
* TipSwitch indicates the presence of a
* finger in single touch mode.
*/
input_report_key(input, BTN_TOUCH,
nd->tipswitch);
input_report_key(input, BTN_TOOL_DOUBLETAP,
nd->tipswitch);
input_event(input, EV_ABS, ABS_X, nd->x);
input_event(input, EV_ABS, ABS_Y, nd->y);
}
break;
case 0xff000002:
/*
* we receive this when the device is in multitouch
* mode. The first of the three values tagged with
* this usage tells if the contact point is real
* or a placeholder
*/
/* Shouldn't get more than 4 footer packets, so skip */
if (nd->mt_foot_count >= 4)
break;
nd->mt_footer[nd->mt_foot_count++] = value;
/* if the footer isn't complete break */
if (nd->mt_foot_count != 4)
break;
/* Pen activity signal. */
if (nd->mt_footer[2]) {
/*
* When the pen deactivates touch, we see a
* bogus frame with ContactCount > 0.
* We can
* save a bit of work by ensuring act_state < 0
* even if deactivation slack is turned off.
*/
nd->act_state = deactivate_slack - 1;
nd->confidence = false;
break;
}
/*
* The first footer value indicates the presence of a
* finger.
*/
if (nd->mt_footer[0]) {
/*
* We do not want to process contacts under
* the size threshold, but do not want to
* ignore them for activation state
*/
if (nd->w < nd->min_width ||
nd->h < nd->min_height)
nd->confidence = false;
} else
break;
if (nd->act_state > 0) {
/*
* Contact meets the activation size threshold
*/
if (nd->w >= nd->activation_width &&
nd->h >= nd->activation_height) {
if (nd->id)
/*
* first contact, activate now
*/
nd->act_state = 0;
else {
/*
* avoid corrupting this frame
* but ensure next frame will
* be active
*/
nd->act_state = 1;
break;
}
} else
/*
* Defer adjusting the activation state
* until the end of the frame.
*/
break;
}
/* Discarding this contact */
if (!nd->confidence)
break;
/* emit a normal (X, Y) for the first point only */
if (nd->id == 0) {
/*
* TipSwitch is superfluous in multitouch
* mode. The footer events tell us
* if there is a finger on the screen or
* not.
*/
nd->first_contact_touch = nd->confidence;
input_event(input, EV_ABS, ABS_X, nd->x);
input_event(input, EV_ABS, ABS_Y, nd->y);
}
/* Emit MT events */
input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
/*
* Translate from height and width to size
* and orientation.
*/
if (nd->w > nd->h) {
input_event(input, EV_ABS,
ABS_MT_ORIENTATION, 1);
input_event(input, EV_ABS,
ABS_MT_TOUCH_MAJOR, nd->w);
input_event(input, EV_ABS,
ABS_MT_TOUCH_MINOR, nd->h);
} else {
input_event(input, EV_ABS,
ABS_MT_ORIENTATION, 0);
input_event(input, EV_ABS,
ABS_MT_TOUCH_MAJOR, nd->h);
input_event(input, EV_ABS,
ABS_MT_TOUCH_MINOR, nd->w);
}
input_mt_sync(field->hidinput->input);
break;
case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
if (!nd->reading_mt) /* Just to be sure */
break;
nd->reading_mt = false;
/*
* Activation state machine logic:
*
* Fundamental states:
* state > 0: Inactive
* state <= 0: Active
* state < -deactivate_slack:
* Pen termination of touch
*
* Specific values of interest
* state == activate_slack
* no valid input since the last reset
*
* state == 0
* general operational state
*
* state == -deactivate_slack
* read sufficient empty frames to accept
* the end of input and reset
*/
if (nd->act_state > 0) { /* Currently inactive */
if (value)
/*
* Consider each live contact as
* evidence of intentional activity.
*/
nd->act_state = (nd->act_state > value)
? nd->act_state - value
: 0;
else
/*
* Empty frame before we hit the
* activity threshold, reset.
*/
nd->act_state = nd->activate_slack;
/*
* Entered this block inactive and no
* coordinates sent this frame, so hold off
* on button state.
*/
break;
} else { /* Currently active */
if (value && nd->act_state >=
nd->deactivate_slack)
/*
* Live point: clear accumulated
* deactivation count.
*/
nd->act_state = 0;
else if (nd->act_state <= nd->deactivate_slack)
/*
* We've consumed the deactivation
* slack, time to deactivate and reset.
*/
nd->act_state =
nd->activate_slack;
else { /* Move towards deactivation */
nd->act_state--;
break;
}
}
if (nd->first_contact_touch && nd->act_state <= 0) {
/*
* Check to see if we're ready to start
* emitting touch events.
*
* Note: activation slack will decrease over
* the course of the frame, and it will be
* inconsistent from the start to the end of
* the frame. However if the frame starts
* with slack, first_contact_touch will still
* be 0 and we will not get to this point.
*/
input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
input_report_key(input, BTN_TOUCH, 1);
} else {
input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
input_report_key(input, BTN_TOUCH, 0);
}
break;
default:
/* fall-back to the generic hidinput handling */
return 0;
}
not_claimed_input:
/* we have handled the hidinput part, now remains hiddev */
if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
hid->hiddev_hid_event(hid, field, usage, value);
return 1;
}
static int ntrig_input_configured(struct hid_device *hid,
struct hid_input *hidinput)
{
struct input_dev *input = hidinput->input;
if (hidinput->report->maxfield < 1)
return 0;
switch (hidinput->report->field[0]->application) {
case HID_DG_PEN:
input->name = "N-Trig Pen";
break;
case HID_DG_TOUCHSCREEN:
/* These keys are redundant for fingers, clear them
* to prevent incorrect identification */
__clear_bit(BTN_TOOL_PEN, input->keybit);
__clear_bit(BTN_TOOL_FINGER, input->keybit);
__clear_bit(BTN_0, input->keybit);
__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
/*
* The physical touchscreen (single touch)
* input has a value for physical, whereas
* the multitouch only has logical input
* fields.
*/
input->name = (hidinput->report->field[0]->physical) ?
"N-Trig Touchscreen" :
"N-Trig MultiTouch";
break;
}
return 0;
}
static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
struct ntrig_data *nd;
struct hid_report *report;
if (id->driver_data)
hdev->quirks |= HID_QUIRK_MULTI_INPUT
| HID_QUIRK_NO_INIT_REPORTS;
nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
if (!nd) {
hid_err(hdev, "cannot allocate N-Trig data\n");
return -ENOMEM;
}
nd->reading_mt = false;
nd->min_width = 0;
nd->min_height = 0;
nd->activate_slack = activate_slack;
nd->act_state = activate_slack;
nd->deactivate_slack = -deactivate_slack;
nd->sensor_logical_width = 1;
nd->sensor_logical_height = 1;
nd->sensor_physical_width = 1;
nd->sensor_physical_height = 1;
hid_set_drvdata(hdev, nd);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
goto err_free;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
if (ret) {
hid_err(hdev, "hw start failed\n");
goto err_free;
}
/* This is needed for devices with more recent firmware versions */
report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0x0a];
if (report) {
/* Let the device settle to ensure the wakeup message gets
* through */
hid_hw_wait(hdev);
hid_hw_request(hdev, report, HID_REQ_GET_REPORT);
/*
* Sanity check: if the current mode is invalid reset it to
* something reasonable.
*/
if (ntrig_get_mode(hdev) >= 4)
ntrig_set_mode(hdev, 3);
}
ntrig_report_version(hdev);
ret = sysfs_create_group(&hdev->dev.kobj,
&ntrig_attribute_group);
if (ret)
hid_err(hdev, "cannot create sysfs group\n");
return 0;
err_free:
kfree(nd);
return ret;
}
static void ntrig_remove(struct hid_device *hdev)
{
sysfs_remove_group(&hdev->dev.kobj,
&ntrig_attribute_group);
hid_hw_stop(hdev);
kfree(hid_get_drvdata(hdev));
}
static const struct hid_device_id ntrig_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_1),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_2),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_3),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_4),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_5),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_6),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_7),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_8),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_9),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_10),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_11),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_12),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_13),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_14),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_15),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_16),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_17),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN_18),
.driver_data = NTRIG_DUPLICATE_USAGES },
{ }
};
MODULE_DEVICE_TABLE(hid, ntrig_devices);
static const struct hid_usage_id ntrig_grabbed_usages[] = {
{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
};
static struct hid_driver ntrig_driver = {
.name = "ntrig",
.id_table = ntrig_devices,
.probe = ntrig_probe,
.remove = ntrig_remove,
.input_mapping = ntrig_input_mapping,
.input_mapped = ntrig_input_mapped,
.input_configured = ntrig_input_configured,
.usage_table = ntrig_grabbed_usages,
.event = ntrig_event,
};
module_hid_driver(ntrig_driver);
MODULE_DESCRIPTION("HID driver for N-Trig touchscreens");
MODULE_LICENSE("GPL");
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