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1032 lines
26 KiB
1032 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* HID driver for N-Trig touchscreens |
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* |
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* Copyright (c) 2008-2010 Rafi Rubin |
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* Copyright (c) 2009-2010 Stephane Chatty |
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*/ |
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|
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/* |
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*/ |
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|
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#include <linux/device.h> |
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#include <linux/hid.h> |
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#include <linux/usb.h> |
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#include "usbhid/usbhid.h" |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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|
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#include "hid-ids.h" |
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|
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#define NTRIG_DUPLICATE_USAGES 0x001 |
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static unsigned int min_width; |
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module_param(min_width, uint, 0644); |
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MODULE_PARM_DESC(min_width, "Minimum touch contact width to accept."); |
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|
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static unsigned int min_height; |
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module_param(min_height, uint, 0644); |
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MODULE_PARM_DESC(min_height, "Minimum touch contact height to accept."); |
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|
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static unsigned int activate_slack = 1; |
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module_param(activate_slack, uint, 0644); |
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MODULE_PARM_DESC(activate_slack, "Number of touch frames to ignore at " |
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"the start of touch input."); |
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|
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static unsigned int deactivate_slack = 4; |
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module_param(deactivate_slack, uint, 0644); |
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MODULE_PARM_DESC(deactivate_slack, "Number of empty frames to ignore before " |
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"deactivating touch."); |
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|
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static unsigned int activation_width = 64; |
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module_param(activation_width, uint, 0644); |
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MODULE_PARM_DESC(activation_width, "Width threshold to immediately start " |
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"processing touch events."); |
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|
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static unsigned int activation_height = 32; |
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module_param(activation_height, uint, 0644); |
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MODULE_PARM_DESC(activation_height, "Height threshold to immediately start " |
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"processing touch events."); |
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struct ntrig_data { |
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/* Incoming raw values for a single contact */ |
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__u16 x, y, w, h; |
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__u16 id; |
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|
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bool tipswitch; |
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bool confidence; |
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bool first_contact_touch; |
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bool reading_mt; |
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__u8 mt_footer[4]; |
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__u8 mt_foot_count; |
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/* The current activation state. */ |
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__s8 act_state; |
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/* Empty frames to ignore before recognizing the end of activity */ |
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__s8 deactivate_slack; |
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|
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/* Frames to ignore before acknowledging the start of activity */ |
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__s8 activate_slack; |
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|
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/* Minimum size contact to accept */ |
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__u16 min_width; |
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__u16 min_height; |
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|
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/* Threshold to override activation slack */ |
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__u16 activation_width; |
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__u16 activation_height; |
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|
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__u16 sensor_logical_width; |
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__u16 sensor_logical_height; |
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__u16 sensor_physical_width; |
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__u16 sensor_physical_height; |
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}; |
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/* |
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* This function converts the 4 byte raw firmware code into |
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* a string containing 5 comma separated numbers. |
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*/ |
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static int ntrig_version_string(unsigned char *raw, char *buf) |
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{ |
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__u8 a = (raw[1] & 0x0e) >> 1; |
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__u8 b = (raw[0] & 0x3c) >> 2; |
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__u8 c = ((raw[0] & 0x03) << 3) | ((raw[3] & 0xe0) >> 5); |
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__u8 d = ((raw[3] & 0x07) << 3) | ((raw[2] & 0xe0) >> 5); |
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__u8 e = raw[2] & 0x07; |
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|
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/* |
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* As yet unmapped bits: |
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* 0b11000000 0b11110001 0b00011000 0b00011000 |
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*/ |
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return sprintf(buf, "%u.%u.%u.%u.%u", a, b, c, d, e); |
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} |
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static inline int ntrig_get_mode(struct hid_device *hdev) |
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{ |
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struct hid_report *report = hdev->report_enum[HID_FEATURE_REPORT]. |
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report_id_hash[0x0d]; |
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if (!report || report->maxfield < 1 || |
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report->field[0]->report_count < 1) |
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return -EINVAL; |
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hid_hw_request(hdev, report, HID_REQ_GET_REPORT); |
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hid_hw_wait(hdev); |
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return (int)report->field[0]->value[0]; |
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} |
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static inline void ntrig_set_mode(struct hid_device *hdev, const int mode) |
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{ |
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struct hid_report *report; |
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__u8 mode_commands[4] = { 0xe, 0xf, 0x1b, 0x10 }; |
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if (mode < 0 || mode > 3) |
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return; |
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report = hdev->report_enum[HID_FEATURE_REPORT]. |
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report_id_hash[mode_commands[mode]]; |
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if (!report) |
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return; |
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hid_hw_request(hdev, report, HID_REQ_GET_REPORT); |
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} |
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static void ntrig_report_version(struct hid_device *hdev) |
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{ |
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int ret; |
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char buf[20]; |
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struct usb_device *usb_dev = hid_to_usb_dev(hdev); |
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unsigned char *data = kmalloc(8, GFP_KERNEL); |
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if (!data) |
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goto err_free; |
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ret = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0), |
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USB_REQ_CLEAR_FEATURE, |
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | |
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USB_DIR_IN, |
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0x30c, 1, data, 8, |
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USB_CTRL_SET_TIMEOUT); |
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if (ret == 8) { |
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ret = ntrig_version_string(&data[2], buf); |
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hid_info(hdev, "Firmware version: %s (%02x%02x %02x%02x)\n", |
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buf, data[2], data[3], data[4], data[5]); |
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} |
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err_free: |
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kfree(data); |
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} |
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static ssize_t show_phys_width(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->sensor_physical_width); |
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} |
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static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL); |
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static ssize_t show_phys_height(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->sensor_physical_height); |
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} |
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static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL); |
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static ssize_t show_log_width(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->sensor_logical_width); |
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} |
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static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL); |
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static ssize_t show_log_height(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->sensor_logical_height); |
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} |
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static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL); |
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static ssize_t show_min_width(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->min_width * |
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nd->sensor_physical_width / |
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nd->sensor_logical_width); |
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} |
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static ssize_t set_min_width(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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unsigned long val; |
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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if (val > nd->sensor_physical_width) |
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return -EINVAL; |
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nd->min_width = val * nd->sensor_logical_width / |
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nd->sensor_physical_width; |
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return count; |
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} |
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static DEVICE_ATTR(min_width, S_IWUSR | S_IRUGO, show_min_width, set_min_width); |
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static ssize_t show_min_height(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->min_height * |
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nd->sensor_physical_height / |
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nd->sensor_logical_height); |
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} |
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static ssize_t set_min_height(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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unsigned long val; |
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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if (val > nd->sensor_physical_height) |
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return -EINVAL; |
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nd->min_height = val * nd->sensor_logical_height / |
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nd->sensor_physical_height; |
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return count; |
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} |
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static DEVICE_ATTR(min_height, S_IWUSR | S_IRUGO, show_min_height, |
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set_min_height); |
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static ssize_t show_activate_slack(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->activate_slack); |
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} |
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static ssize_t set_activate_slack(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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unsigned long val; |
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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if (val > 0x7f) |
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return -EINVAL; |
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nd->activate_slack = val; |
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return count; |
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} |
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static DEVICE_ATTR(activate_slack, S_IWUSR | S_IRUGO, show_activate_slack, |
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set_activate_slack); |
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static ssize_t show_activation_width(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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return sprintf(buf, "%d\n", nd->activation_width * |
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nd->sensor_physical_width / |
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nd->sensor_logical_width); |
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} |
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static ssize_t set_activation_width(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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unsigned long val; |
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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if (val > nd->sensor_physical_width) |
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return -EINVAL; |
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nd->activation_width = val * nd->sensor_logical_width / |
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nd->sensor_physical_width; |
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return count; |
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} |
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static DEVICE_ATTR(activation_width, S_IWUSR | S_IRUGO, show_activation_width, |
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set_activation_width); |
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static ssize_t show_activation_height(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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|
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return sprintf(buf, "%d\n", nd->activation_height * |
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nd->sensor_physical_height / |
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nd->sensor_logical_height); |
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} |
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|
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static ssize_t set_activation_height(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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|
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unsigned long val; |
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|
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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|
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if (val > nd->sensor_physical_height) |
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return -EINVAL; |
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|
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nd->activation_height = val * nd->sensor_logical_height / |
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nd->sensor_physical_height; |
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|
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return count; |
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} |
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static DEVICE_ATTR(activation_height, S_IWUSR | S_IRUGO, |
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show_activation_height, set_activation_height); |
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|
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static ssize_t show_deactivate_slack(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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|
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return sprintf(buf, "%d\n", -nd->deactivate_slack); |
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} |
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static ssize_t set_deactivate_slack(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct hid_device *hdev = to_hid_device(dev); |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
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|
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unsigned long val; |
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|
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if (kstrtoul(buf, 0, &val)) |
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return -EINVAL; |
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|
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/* |
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* No more than 8 terminal frames have been observed so far |
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* and higher slack is highly likely to leave the single |
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* touch emulation stuck down. |
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*/ |
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if (val > 7) |
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return -EINVAL; |
|
|
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nd->deactivate_slack = -val; |
|
|
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return count; |
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} |
|
|
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static DEVICE_ATTR(deactivate_slack, S_IWUSR | S_IRUGO, show_deactivate_slack, |
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set_deactivate_slack); |
|
|
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static struct attribute *sysfs_attrs[] = { |
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&dev_attr_sensor_physical_width.attr, |
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&dev_attr_sensor_physical_height.attr, |
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&dev_attr_sensor_logical_width.attr, |
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&dev_attr_sensor_logical_height.attr, |
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&dev_attr_min_height.attr, |
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&dev_attr_min_width.attr, |
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&dev_attr_activate_slack.attr, |
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&dev_attr_activation_width.attr, |
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&dev_attr_activation_height.attr, |
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&dev_attr_deactivate_slack.attr, |
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NULL |
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}; |
|
|
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static const struct attribute_group ntrig_attribute_group = { |
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.attrs = sysfs_attrs |
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}; |
|
|
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/* |
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* this driver is aimed at two firmware versions in circulation: |
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* - dual pen/finger single touch |
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* - finger multitouch, pen not working |
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*/ |
|
|
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static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi, |
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struct hid_field *field, struct hid_usage *usage, |
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unsigned long **bit, int *max) |
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{ |
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struct ntrig_data *nd = hid_get_drvdata(hdev); |
|
|
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/* No special mappings needed for the pen and single touch */ |
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if (field->physical) |
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return 0; |
|
|
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switch (usage->hid & HID_USAGE_PAGE) { |
|
case HID_UP_GENDESK: |
|
switch (usage->hid) { |
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case HID_GD_X: |
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hid_map_usage(hi, usage, bit, max, |
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EV_ABS, ABS_MT_POSITION_X); |
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input_set_abs_params(hi->input, ABS_X, |
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field->logical_minimum, |
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field->logical_maximum, 0, 0); |
|
|
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if (!nd->sensor_logical_width) { |
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nd->sensor_logical_width = |
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field->logical_maximum - |
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field->logical_minimum; |
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nd->sensor_physical_width = |
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field->physical_maximum - |
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field->physical_minimum; |
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nd->activation_width = activation_width * |
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nd->sensor_logical_width / |
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nd->sensor_physical_width; |
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nd->min_width = min_width * |
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nd->sensor_logical_width / |
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nd->sensor_physical_width; |
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} |
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return 1; |
|
case HID_GD_Y: |
|
hid_map_usage(hi, usage, bit, max, |
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EV_ABS, ABS_MT_POSITION_Y); |
|
input_set_abs_params(hi->input, ABS_Y, |
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field->logical_minimum, |
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field->logical_maximum, 0, 0); |
|
|
|
if (!nd->sensor_logical_height) { |
|
nd->sensor_logical_height = |
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field->logical_maximum - |
|
field->logical_minimum; |
|
nd->sensor_physical_height = |
|
field->physical_maximum - |
|
field->physical_minimum; |
|
nd->activation_height = activation_height * |
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nd->sensor_logical_height / |
|
nd->sensor_physical_height; |
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nd->min_height = min_height * |
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nd->sensor_logical_height / |
|
nd->sensor_physical_height; |
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} |
|
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: |
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case HID_DG_CONTACTMAX: |
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return -1; |
|
|
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/* width/height mapped on TouchMajor/TouchMinor/Orientation */ |
|
case HID_DG_WIDTH: |
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hid_map_usage(hi, usage, bit, max, |
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EV_ABS, ABS_MT_TOUCH_MAJOR); |
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return 1; |
|
case HID_DG_HEIGHT: |
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hid_map_usage(hi, usage, bit, max, |
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EV_ABS, ABS_MT_TOUCH_MINOR); |
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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) |
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return 0; |
|
|
|
if (usage->type == EV_KEY || usage->type == EV_REL |
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|| usage->type == EV_ABS) |
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clear_bit(usage->code, *bit); |
|
|
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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; |
|
|
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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_LICENSE("GPL");
|
|
|