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 void 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; 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 } 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 dev_err(&hdev->dev, "parse failed\n"); 110 goto err_free; 111 } 112 113 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 114 if (ret) { 115 dev_err(&hdev->dev, "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_MOUSE), 132 .driver_data = CP_2WHEEL_MOUSE_HACK }, 133 { } 134 }; 135 MODULE_DEVICE_TABLE(hid, cp_devices); 136 137 static struct hid_driver cp_driver = { 138 .name = "cypress", 139 .id_table = cp_devices, 140 .report_fixup = cp_report_fixup, 141 .input_mapped = cp_input_mapped, 142 .event = cp_event, 143 .probe = cp_probe, 144 }; 145 146 static int __init cp_init(void) 147 { 148 return hid_register_driver(&cp_driver); 149 } 150 151 static void __exit cp_exit(void) 152 { 153 hid_unregister_driver(&cp_driver); 154 } 155 156 module_init(cp_init); 157 module_exit(cp_exit); 158 MODULE_LICENSE("GPL"); 159