1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * HID driver for some cypress "special" devices 4 * 5 * Copyright (c) 1999 Andreas Gal 6 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> 7 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc 8 * Copyright (c) 2006-2007 Jiri Kosina 9 * Copyright (c) 2008 Jiri Slaby 10 */ 11 12 /* 13 */ 14 15 #include <linux/device.h> 16 #include <linux/hid.h> 17 #include <linux/input.h> 18 #include <linux/module.h> 19 20 #include "hid-ids.h" 21 22 #define CP_RDESC_SWAPPED_MIN_MAX 0x01 23 #define CP_2WHEEL_MOUSE_HACK 0x02 24 #define CP_2WHEEL_MOUSE_HACK_ON 0x04 25 26 /* 27 * Some USB barcode readers from cypress have usage min and usage max in 28 * the wrong order 29 */ 30 static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc, 31 unsigned int *rsize) 32 { 33 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 34 unsigned int i; 35 36 if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX)) 37 return rdesc; 38 39 if (*rsize < 4) 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