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