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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         for (i = 0; i < *rsize - 4; i++)
 43                 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
 44                         rdesc[i] = 0x19;
 45                         rdesc[i + 2] = 0x29;
 46                         swap(rdesc[i + 3], rdesc[i + 1]);
 47                 }
 48         return rdesc;
 49 }
 50 
 51 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 52                 struct hid_field *field, struct hid_usage *usage,
 53                 unsigned long **bit, int *max)
 54 {
 55         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 56 
 57         if (!(quirks & CP_2WHEEL_MOUSE_HACK))
 58                 return 0;
 59 
 60         if (usage->type == EV_REL && usage->code == REL_WHEEL)
 61                 set_bit(REL_HWHEEL, *bit);
 62         if (usage->hid == 0x00090005)
 63                 return -1;
 64 
 65         return 0;
 66 }
 67 
 68 static int cp_event(struct hid_device *hdev, struct hid_field *field,
 69                 struct hid_usage *usage, __s32 value)
 70 {
 71         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 72 
 73         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
 74                         !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
 75                 return 0;
 76 
 77         if (usage->hid == 0x00090005) {
 78                 if (value)
 79                         quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
 80                 else
 81                         quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
 82                 hid_set_drvdata(hdev, (void *)quirks);
 83                 return 1;
 84         }
 85 
 86         if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
 87                 struct input_dev *input = field->hidinput->input;
 88 
 89                 input_event(input, usage->type, REL_HWHEEL, value);
 90                 return 1;
 91         }
 92 
 93         return 0;
 94 }
 95 
 96 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 97 {
 98         unsigned long quirks = id->driver_data;
 99         int ret;
100 
101         hid_set_drvdata(hdev, (void *)quirks);
102 
103         ret = hid_parse(hdev);
104         if (ret) {
105                 hid_err(hdev, "parse failed\n");
106                 goto err_free;
107         }
108 
109         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
110         if (ret) {
111                 hid_err(hdev, "hw start failed\n");
112                 goto err_free;
113         }
114 
115         return 0;
116 err_free:
117         return ret;
118 }
119 
120 static const struct hid_device_id cp_devices[] = {
121         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
122                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
123         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
124                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
125         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
126                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
127         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
128                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
129         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
130                 .driver_data = CP_2WHEEL_MOUSE_HACK },
131         { }
132 };
133 MODULE_DEVICE_TABLE(hid, cp_devices);
134 
135 static struct hid_driver cp_driver = {
136         .name = "cypress",
137         .id_table = cp_devices,
138         .report_fixup = cp_report_fixup,
139         .input_mapped = cp_input_mapped,
140         .event = cp_event,
141         .probe = cp_probe,
142 };
143 module_hid_driver(cp_driver);
144 
145 MODULE_LICENSE("GPL");
146 

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