hid-cypress.c (4714B)
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#define VA_INVAL_LOGICAL_BOUNDARY 0x08 27 28/* 29 * Some USB barcode readers from cypress have usage min and usage max in 30 * the wrong order 31 */ 32static __u8 *cp_rdesc_fixup(struct hid_device *hdev, __u8 *rdesc, 33 unsigned int *rsize) 34{ 35 unsigned int i; 36 37 if (*rsize < 4) 38 return rdesc; 39 40 for (i = 0; i < *rsize - 4; i++) 41 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) { 42 rdesc[i] = 0x19; 43 rdesc[i + 2] = 0x29; 44 swap(rdesc[i + 3], rdesc[i + 1]); 45 } 46 return rdesc; 47} 48 49static __u8 *va_logical_boundary_fixup(struct hid_device *hdev, __u8 *rdesc, 50 unsigned int *rsize) 51{ 52 /* 53 * Varmilo VA104M (with VID Cypress and device ID 07B1) incorrectly 54 * reports Logical Minimum of its Consumer Control device as 572 55 * (0x02 0x3c). Fix this by setting its Logical Minimum to zero. 56 */ 57 if (*rsize == 25 && 58 rdesc[0] == 0x05 && rdesc[1] == 0x0c && 59 rdesc[2] == 0x09 && rdesc[3] == 0x01 && 60 rdesc[6] == 0x19 && rdesc[7] == 0x00 && 61 rdesc[11] == 0x16 && rdesc[12] == 0x3c && rdesc[13] == 0x02) { 62 hid_info(hdev, 63 "fixing up varmilo VA104M consumer control report descriptor\n"); 64 rdesc[12] = 0x00; 65 rdesc[13] = 0x00; 66 } 67 return rdesc; 68} 69 70static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc, 71 unsigned int *rsize) 72{ 73 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 74 75 if (quirks & CP_RDESC_SWAPPED_MIN_MAX) 76 rdesc = cp_rdesc_fixup(hdev, rdesc, rsize); 77 if (quirks & VA_INVAL_LOGICAL_BOUNDARY) 78 rdesc = va_logical_boundary_fixup(hdev, rdesc, rsize); 79 80 return rdesc; 81} 82 83static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi, 84 struct hid_field *field, struct hid_usage *usage, 85 unsigned long **bit, int *max) 86{ 87 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 88 89 if (!(quirks & CP_2WHEEL_MOUSE_HACK)) 90 return 0; 91 92 if (usage->type == EV_REL && usage->code == REL_WHEEL) 93 set_bit(REL_HWHEEL, *bit); 94 if (usage->hid == 0x00090005) 95 return -1; 96 97 return 0; 98} 99 100static int cp_event(struct hid_device *hdev, struct hid_field *field, 101 struct hid_usage *usage, __s32 value) 102{ 103 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev); 104 105 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || 106 !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK)) 107 return 0; 108 109 if (usage->hid == 0x00090005) { 110 if (value) 111 quirks |= CP_2WHEEL_MOUSE_HACK_ON; 112 else 113 quirks &= ~CP_2WHEEL_MOUSE_HACK_ON; 114 hid_set_drvdata(hdev, (void *)quirks); 115 return 1; 116 } 117 118 if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) { 119 struct input_dev *input = field->hidinput->input; 120 121 input_event(input, usage->type, REL_HWHEEL, value); 122 return 1; 123 } 124 125 return 0; 126} 127 128static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id) 129{ 130 unsigned long quirks = id->driver_data; 131 int ret; 132 133 hid_set_drvdata(hdev, (void *)quirks); 134 135 ret = hid_parse(hdev); 136 if (ret) { 137 hid_err(hdev, "parse failed\n"); 138 goto err_free; 139 } 140 141 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 142 if (ret) { 143 hid_err(hdev, "hw start failed\n"); 144 goto err_free; 145 } 146 147 return 0; 148err_free: 149 return ret; 150} 151 152static const struct hid_device_id cp_devices[] = { 153 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1), 154 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 155 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2), 156 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 157 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3), 158 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 159 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4), 160 .driver_data = CP_RDESC_SWAPPED_MIN_MAX }, 161 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE), 162 .driver_data = CP_2WHEEL_MOUSE_HACK }, 163 { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_VARMILO_VA104M_07B1), 164 .driver_data = VA_INVAL_LOGICAL_BOUNDARY }, 165 { } 166}; 167MODULE_DEVICE_TABLE(hid, cp_devices); 168 169static struct hid_driver cp_driver = { 170 .name = "cypress", 171 .id_table = cp_devices, 172 .report_fixup = cp_report_fixup, 173 .input_mapped = cp_input_mapped, 174 .event = cp_event, 175 .probe = cp_probe, 176}; 177module_hid_driver(cp_driver); 178 179MODULE_LICENSE("GPL");