247 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * HID driver for CMedia CM6533 audio jack controls4 * and HS100B mute buttons5 *6 * Copyright (C) 2015 Ben Chen <ben_chen@bizlinktech.com>7 * Copyright (C) 2021 Thomas Weißschuh <linux@weissschuh.net>8 */9 10#include <linux/device.h>11#include <linux/hid.h>12#include <linux/module.h>13#include "hid-ids.h"14 15MODULE_AUTHOR("Ben Chen");16MODULE_AUTHOR("Thomas Weißschuh");17MODULE_DESCRIPTION("CM6533 HID jack controls and HS100B mute button");18MODULE_LICENSE("GPL");19 20#define CM6533_JD_TYPE_COUNT 121#define CM6533_JD_RAWEV_LEN 1622#define CM6533_JD_SFX_OFFSET 823 24#define HS100B_RDESC_ORIG_SIZE 6025 26/* Fixed report descriptor of HS-100B audio chip27 * Bit 4 is an abolute Microphone mute usage instead of being unassigned.28 */29static const __u8 hs100b_rdesc_fixed[] = {30 0x05, 0x0C, /* Usage Page (Consumer), */31 0x09, 0x01, /* Usage (Consumer Control), */32 0xA1, 0x01, /* Collection (Application), */33 0x15, 0x00, /* Logical Minimum (0), */34 0x25, 0x01, /* Logical Maximum (1), */35 0x09, 0xE9, /* Usage (Volume Inc), */36 0x09, 0xEA, /* Usage (Volume Dec), */37 0x75, 0x01, /* Report Size (1), */38 0x95, 0x02, /* Report Count (2), */39 0x81, 0x02, /* Input (Variable), */40 0x09, 0xE2, /* Usage (Mute), */41 0x95, 0x01, /* Report Count (1), */42 0x81, 0x06, /* Input (Variable, Relative), */43 0x05, 0x0B, /* Usage Page (Telephony), */44 0x09, 0x2F, /* Usage (2Fh), */45 0x81, 0x02, /* Input (Variable), */46 0x09, 0x20, /* Usage (20h), */47 0x81, 0x06, /* Input (Variable, Relative), */48 0x05, 0x0C, /* Usage Page (Consumer), */49 0x09, 0x00, /* Usage (00h), */50 0x95, 0x03, /* Report Count (3), */51 0x81, 0x02, /* Input (Variable), */52 0x26, 0xFF, 0x00, /* Logical Maximum (255), */53 0x09, 0x00, /* Usage (00h), */54 0x75, 0x08, /* Report Size (8), */55 0x95, 0x03, /* Report Count (3), */56 0x81, 0x02, /* Input (Variable), */57 0x09, 0x00, /* Usage (00h), */58 0x95, 0x04, /* Report Count (4), */59 0x91, 0x02, /* Output (Variable), */60 0xC0 /* End Collection */61};62 63/*64*65*CM6533 audio jack HID raw events:66*67*Plug in:68*01000600 002083xx 080008c0 1000000069*about 3 seconds later...70*01000a00 002083xx 08000380 1000000071*01000600 002083xx 08000380 1000000072*73*Plug out:74*01000400 002083xx 080008c0 x000000075*/76 77static const u8 ji_sfx[] = { 0x08, 0x00, 0x08, 0xc0 };78static const u8 ji_in[] = { 0x01, 0x00, 0x06, 0x00 };79static const u8 ji_out[] = { 0x01, 0x00, 0x04, 0x00 };80 81static int jack_switch_types[CM6533_JD_TYPE_COUNT] = {82 SW_HEADPHONE_INSERT,83};84 85struct cmhid {86 struct input_dev *input_dev;87 struct hid_device *hid;88 unsigned short switch_map[CM6533_JD_TYPE_COUNT];89};90 91static void hp_ev(struct hid_device *hid, struct cmhid *cm, int value)92{93 input_report_switch(cm->input_dev, SW_HEADPHONE_INSERT, value);94 input_sync(cm->input_dev);95}96 97static int cmhid_raw_event(struct hid_device *hid, struct hid_report *report,98 u8 *data, int len)99{100 struct cmhid *cm = hid_get_drvdata(hid);101 102 if (len != CM6533_JD_RAWEV_LEN)103 goto out;104 if (memcmp(data+CM6533_JD_SFX_OFFSET, ji_sfx, sizeof(ji_sfx)))105 goto out;106 107 if (!memcmp(data, ji_out, sizeof(ji_out))) {108 hp_ev(hid, cm, 0);109 goto out;110 }111 if (!memcmp(data, ji_in, sizeof(ji_in))) {112 hp_ev(hid, cm, 1);113 goto out;114 }115 116out:117 return 0;118}119 120static int cmhid_input_configured(struct hid_device *hid,121 struct hid_input *hidinput)122{123 struct input_dev *input_dev = hidinput->input;124 struct cmhid *cm = hid_get_drvdata(hid);125 int i;126 127 cm->input_dev = input_dev;128 memcpy(cm->switch_map, jack_switch_types, sizeof(cm->switch_map));129 input_dev->evbit[0] = BIT(EV_SW);130 for (i = 0; i < CM6533_JD_TYPE_COUNT; i++)131 input_set_capability(cm->input_dev,132 EV_SW, jack_switch_types[i]);133 return 0;134}135 136static int cmhid_input_mapping(struct hid_device *hid,137 struct hid_input *hi, struct hid_field *field,138 struct hid_usage *usage, unsigned long **bit, int *max)139{140 return -1;141}142 143static int cmhid_probe(struct hid_device *hid, const struct hid_device_id *id)144{145 int ret;146 struct cmhid *cm;147 148 cm = kzalloc(sizeof(struct cmhid), GFP_KERNEL);149 if (!cm) {150 ret = -ENOMEM;151 goto allocfail;152 }153 154 cm->hid = hid;155 156 hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;157 hid_set_drvdata(hid, cm);158 159 ret = hid_parse(hid);160 if (ret) {161 hid_err(hid, "parse failed\n");162 goto fail;163 }164 165 ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);166 if (ret) {167 hid_err(hid, "hw start failed\n");168 goto fail;169 }170 171 return 0;172fail:173 kfree(cm);174allocfail:175 return ret;176}177 178static void cmhid_remove(struct hid_device *hid)179{180 struct cmhid *cm = hid_get_drvdata(hid);181 182 hid_hw_stop(hid);183 kfree(cm);184}185 186static const struct hid_device_id cmhid_devices[] = {187 { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },188 { }189};190MODULE_DEVICE_TABLE(hid, cmhid_devices);191 192static struct hid_driver cmhid_driver = {193 .name = "cm6533_jd",194 .id_table = cmhid_devices,195 .raw_event = cmhid_raw_event,196 .input_configured = cmhid_input_configured,197 .probe = cmhid_probe,198 .remove = cmhid_remove,199 .input_mapping = cmhid_input_mapping,200};201 202static const __u8 *cmhid_hs100b_report_fixup(struct hid_device *hid, __u8 *rdesc,203 unsigned int *rsize)204{205 if (*rsize == HS100B_RDESC_ORIG_SIZE) {206 hid_info(hid, "Fixing CMedia HS-100B report descriptor\n");207 *rsize = sizeof(hs100b_rdesc_fixed);208 return hs100b_rdesc_fixed;209 }210 return rdesc;211}212 213static const struct hid_device_id cmhid_hs100b_devices[] = {214 { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CMEDIA_HS100B) },215 { }216};217MODULE_DEVICE_TABLE(hid, cmhid_hs100b_devices);218 219static struct hid_driver cmhid_hs100b_driver = {220 .name = "cmedia_hs100b",221 .id_table = cmhid_hs100b_devices,222 .report_fixup = cmhid_hs100b_report_fixup,223};224 225static int cmedia_init(void)226{227 int ret;228 229 ret = hid_register_driver(&cmhid_driver);230 if (ret)231 return ret;232 233 ret = hid_register_driver(&cmhid_hs100b_driver);234 if (ret)235 hid_unregister_driver(&cmhid_driver);236 237 return ret;238}239module_init(cmedia_init);240 241static void cmedia_exit(void)242{243 hid_unregister_driver(&cmhid_driver);244 hid_unregister_driver(&cmhid_hs100b_driver);245}246module_exit(cmedia_exit);247