drivers/hid/hid-cmedia.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID driver for CMedia CM6533 audio jack controls
   4  * and HS100B mute buttons
   5  *
   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
  15 MODULE_AUTHOR("Ben Chen");
  16 MODULE_AUTHOR("Thomas Weißschuh");
  17 MODULE_DESCRIPTION("CM6533 HID jack controls and HS100B mute button");
  18 MODULE_LICENSE("GPL");
  19
  20 #define CM6533_JD_TYPE_COUNT      1
  21 #define CM6533_JD_RAWEV_LEN      16
  22 #define CM6533_JD_SFX_OFFSET      8
  23
  24 #define HS100B_RDESC_ORIG_SIZE   60
  25
  26 /* Fixed report descriptor of HS-100B audio chip
  27  * Bit 4 is an abolute Microphone mute usage instead of being unassigned.
  28  */
  29 static __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 10000000
  69 *about 3 seconds later...
  70 *01000a00 002083xx 08000380 10000000
  71 *01000600 002083xx 08000380 10000000
  72 *
  73 *Plug out:
  74 *01000400 002083xx 080008c0 x0000000
  75 */
  76
  77 static const u8 ji_sfx[] = { 0x08, 0x00, 0x08, 0xc0 };
  78 static const u8 ji_in[]  = { 0x01, 0x00, 0x06, 0x00 };
  79 static const u8 ji_out[] = { 0x01, 0x00, 0x04, 0x00 };
  80
  81 static int jack_switch_types[CM6533_JD_TYPE_COUNT] = {
  82         SW_HEADPHONE_INSERT,
  83 };
  84
  85 struct cmhid {
  86         struct input_dev *input_dev;
  87         struct hid_device *hid;
  88         unsigned short switch_map[CM6533_JD_TYPE_COUNT];
  89 };
  90
  91 static 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
  97 static 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
 116 out:
 117         return 0;
 118 }
 119
 120 static 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
 136 static 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
 143 static 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;
 172 fail:
 173         kfree(cm);
 174 allocfail:
 175         return ret;
 176 }
 177
 178 static 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
 186 static const struct hid_device_id cmhid_devices[] = {
 187         { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
 188         { }
 189 };
 190 MODULE_DEVICE_TABLE(hid, cmhid_devices);
 191
 192 static 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
 202 static __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                 rdesc = hs100b_rdesc_fixed;
 208                 *rsize = sizeof(hs100b_rdesc_fixed);
 209         }
 210         return rdesc;
 211 }
 212
 213 static const struct hid_device_id cmhid_hs100b_devices[] = {
 214         { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CMEDIA_HS100B) },
 215         { }
 216 };
 217 MODULE_DEVICE_TABLE(hid, cmhid_hs100b_devices);
 218
 219 static 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
 225 static 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 }
 239 module_init(cmedia_init);
 240
 241 static void cmedia_exit(void)
 242 {
 243                 hid_unregister_driver(&cmhid_driver);
 244                 hid_unregister_driver(&cmhid_hs100b_driver);
 245 }
 246 module_exit(cmedia_exit);