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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                         __u8 tmp;
 45 
 46                         rdesc[i] = 0x19;
 47                         rdesc[i + 2] = 0x29;
 48                         tmp = rdesc[i + 3];
 49                         rdesc[i + 3] = rdesc[i + 1];
 50                         rdesc[i + 1] = tmp;
 51                 }
 52         return rdesc;
 53 }
 54 
 55 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 56                 struct hid_field *field, struct hid_usage *usage,
 57                 unsigned long **bit, int *max)
 58 {
 59         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 60 
 61         if (!(quirks & CP_2WHEEL_MOUSE_HACK))
 62                 return 0;
 63 
 64         if (usage->type == EV_REL && usage->code == REL_WHEEL)
 65                 set_bit(REL_HWHEEL, *bit);
 66         if (usage->hid == 0x00090005)
 67                 return -1;
 68 
 69         return 0;
 70 }
 71 
 72 static int cp_event(struct hid_device *hdev, struct hid_field *field,
 73                 struct hid_usage *usage, __s32 value)
 74 {
 75         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 76 
 77         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
 78                         !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
 79                 return 0;
 80 
 81         if (usage->hid == 0x00090005) {
 82                 if (value)
 83                         quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
 84                 else
 85                         quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
 86                 hid_set_drvdata(hdev, (void *)quirks);
 87                 return 1;
 88         }
 89 
 90         if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
 91                 struct input_dev *input = field->hidinput->input;
 92 
 93                 input_event(input, usage->type, REL_HWHEEL, value);
 94                 return 1;
 95         }
 96 
 97         return 0;
 98 }
 99 
100 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
101 {
102         unsigned long quirks = id->driver_data;
103         int ret;
104 
105         hid_set_drvdata(hdev, (void *)quirks);
106 
107         ret = hid_parse(hdev);
108         if (ret) {
109                 hid_err(hdev, "parse failed\n");
110                 goto err_free;
111         }
112 
113         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
114         if (ret) {
115                 hid_err(hdev, "hw start failed\n");
116                 goto err_free;
117         }
118 
119         return 0;
120 err_free:
121         return ret;
122 }
123 
124 static const struct hid_device_id cp_devices[] = {
125         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
126                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
127         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
128                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
129         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
130                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
131         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
132                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
133         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
134                 .driver_data = CP_2WHEEL_MOUSE_HACK },
135         { }
136 };
137 MODULE_DEVICE_TABLE(hid, cp_devices);
138 
139 static struct hid_driver cp_driver = {
140         .name = "cypress",
141         .id_table = cp_devices,
142         .report_fixup = cp_report_fixup,
143         .input_mapped = cp_input_mapped,
144         .event = cp_event,
145         .probe = cp_probe,
146 };
147 module_hid_driver(cp_driver);
148 
149 MODULE_LICENSE("GPL");
150 

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