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Linux/drivers/hid/hid-cypress.c

  1 /*
  2  *  HID driver for some cypress "special" devices
  3  *
  4  *  Copyright (c) 1999 Andreas Gal
  5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  7  *  Copyright (c) 2006-2007 Jiri Kosina
  8  *  Copyright (c) 2008 Jiri Slaby
  9  */
 10 
 11 /*
 12  * This program is free software; you can redistribute it and/or modify it
 13  * under the terms of the GNU General Public License as published by the Free
 14  * Software Foundation; either version 2 of the License, or (at your option)
 15  * any later version.
 16  */
 17 
 18 #include <linux/device.h>
 19 #include <linux/hid.h>
 20 #include <linux/input.h>
 21 #include <linux/module.h>
 22 
 23 #include "hid-ids.h"
 24 
 25 #define CP_RDESC_SWAPPED_MIN_MAX        0x01
 26 #define CP_2WHEEL_MOUSE_HACK            0x02
 27 #define CP_2WHEEL_MOUSE_HACK_ON         0x04
 28 
 29 /*
 30  * Some USB barcode readers from cypress have usage min and usage max in
 31  * the wrong order
 32  */
 33 static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 34                 unsigned int *rsize)
 35 {
 36         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 37         unsigned int i;
 38 
 39         if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
 40                 return rdesc;
 41 
 42         if (*rsize < 4)
 43                 return rdesc;
 44 
 45         for (i = 0; i < *rsize - 4; i++)
 46                 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
 47                         rdesc[i] = 0x19;
 48                         rdesc[i + 2] = 0x29;
 49                         swap(rdesc[i + 3], rdesc[i + 1]);
 50                 }
 51         return rdesc;
 52 }
 53 
 54 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 55                 struct hid_field *field, struct hid_usage *usage,
 56                 unsigned long **bit, int *max)
 57 {
 58         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 59 
 60         if (!(quirks & CP_2WHEEL_MOUSE_HACK))
 61                 return 0;
 62 
 63         if (usage->type == EV_REL && usage->code == REL_WHEEL)
 64                 set_bit(REL_HWHEEL, *bit);
 65         if (usage->hid == 0x00090005)
 66                 return -1;
 67 
 68         return 0;
 69 }
 70 
 71 static int cp_event(struct hid_device *hdev, struct hid_field *field,
 72                 struct hid_usage *usage, __s32 value)
 73 {
 74         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 75 
 76         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
 77                         !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
 78                 return 0;
 79 
 80         if (usage->hid == 0x00090005) {
 81                 if (value)
 82                         quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
 83                 else
 84                         quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
 85                 hid_set_drvdata(hdev, (void *)quirks);
 86                 return 1;
 87         }
 88 
 89         if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
 90                 struct input_dev *input = field->hidinput->input;
 91 
 92                 input_event(input, usage->type, REL_HWHEEL, value);
 93                 return 1;
 94         }
 95 
 96         return 0;
 97 }
 98 
 99 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
100 {
101         unsigned long quirks = id->driver_data;
102         int ret;
103 
104         hid_set_drvdata(hdev, (void *)quirks);
105 
106         ret = hid_parse(hdev);
107         if (ret) {
108                 hid_err(hdev, "parse failed\n");
109                 goto err_free;
110         }
111 
112         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
113         if (ret) {
114                 hid_err(hdev, "hw start failed\n");
115                 goto err_free;
116         }
117 
118         return 0;
119 err_free:
120         return ret;
121 }
122 
123 static const struct hid_device_id cp_devices[] = {
124         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
125                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
126         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
127                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
128         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
129                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
130         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
131                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
132         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
133                 .driver_data = CP_2WHEEL_MOUSE_HACK },
134         { }
135 };
136 MODULE_DEVICE_TABLE(hid, cp_devices);
137 
138 static struct hid_driver cp_driver = {
139         .name = "cypress",
140         .id_table = cp_devices,
141         .report_fixup = cp_report_fixup,
142         .input_mapped = cp_input_mapped,
143         .event = cp_event,
144         .probe = cp_probe,
145 };
146 module_hid_driver(cp_driver);
147 
148 MODULE_LICENSE("GPL");
149 

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