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) 2007 Paul Walmsley 9 * Copyright (c) 2008 Jiri Slaby 10 */ 11 12 /* 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the Free 15 * Software Foundation; either version 2 of the License, or (at your option) 16 * any later version. 17 */ 18 19 #include <linux/device.h> 20 #include <linux/hid.h> 21 #include <linux/input.h> 22 #include <linux/module.h> 23 24 #include "hid-ids.h" 25 26 #define CP_RDESC_SWAPPED_MIN_MAX 0x01 27 #define CP_2WHEEL_MOUSE_HACK 0x02 28 #define CP_2WHEEL_MOUSE_HACK_ON 0x04 29 30 /* 31 * Some USB barcode readers from cypress have usage min and usage max in 32 * the wrong order 33 */ 34 static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc, 35 unsigned int *rsize) 36 { 37 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 38 unsigned int i; 39 40 if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX)) 41 return rdesc; 42 43 for (i = 0; i < *rsize - 4; i++) 44 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) { 45 __u8 tmp; 46 47 rdesc[i] = 0x19; 48 rdesc[i + 2] = 0x29; 49 tmp = rdesc[i + 3]; 50 rdesc[i + 3] = rdesc[i + 1]; 51 rdesc[i + 1] = tmp; 52 } 53 return rdesc; 54 } 55 56 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi, 57 struct hid_field *field, struct hid_usage *usage, 58 unsigned long **bit, int *max) 59 { 60 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 61 62 if (!(quirks & CP_2WHEEL_MOUSE_HACK)) 63 return 0; 64 65 if (usage->type == EV_REL && usage->code == REL_WHEEL) 66 set_bit(REL_HWHEEL, *bit); 67 if (usage->hid == 0x00090005) 68 return -1; 69 70 return 0; 71 } 72 73 static int cp_event(struct hid_device *hdev, struct hid_field *field, 74 struct hid_usage *usage, __s32 value) 75 { 76 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 77 78 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || 79 !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK)) 80 return 0; 81 82 if (usage->hid == 0x00090005) { 83 if (value) 84 quirks |= CP_2WHEEL_MOUSE_HACK_ON; 85 else 86 quirks &= ~CP_2WHEEL_MOUSE_HACK_ON; 87 hid_set_drvdata(hdev, (void *)quirks); 88 return 1; 89 } 90 91 if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) { 92 struct input_dev *input = field->hidinput->input; 93 94 input_event(input, usage->type, REL_HWHEEL, value); 95 return 1; 96 } 97 98 return 0; 99 } 100 101 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id) 102 { 103 unsigned long quirks = id->driver_data; 104 int ret; 105 106 hid_set_drvdata(hdev, (void *)quirks); 107 108 ret = hid_parse(hdev); 109 if (ret) { 110 hid_err(hdev, "parse failed\n"); 111 goto err_free; 112 } 113 114 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 115 if (ret) { 116 hid_err(hdev, "hw start failed\n"); 117 goto err_free; 118 } 119 120 return 0; 121 err_free: 122 return ret; 123 } 124 125 static const struct hid_device_id cp_devices[] = { 126 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1), 127 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 128 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2), 129 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 130 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3), 131 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 132 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4), 133 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 134 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE), 135 .driver_data = CP_2WHEEL_MOUSE_HACK }, 136 { } 137 }; 138 MODULE_DEVICE_TABLE(hid, cp_devices); 139 140 static struct hid_driver cp_driver = { 141 .name = "cypress", 142 .id_table = cp_devices, 143 .report_fixup = cp_report_fixup, 144 .input_mapped = cp_input_mapped, 145 .event = cp_event, 146 .probe = cp_probe, 147 }; 148 149 static int __init cp_init(void) 150 { 151 return hid_register_driver(&cp_driver); 152 } 153 154 static void __exit cp_exit(void) 155 { 156 hid_unregister_driver(&cp_driver); 157 } 158 159 module_init(cp_init); 160 module_exit(cp_exit); 161 MODULE_LICENSE("GPL"); 162