LXR linux/drivers/hid/hid-cmedia.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * HID driver for CMedia CM6533 audio jack controls
   4 *
   5 * Copyright (C) 2015 Ben Chen <ben_chen@bizlinktech.com>
   6 */
   7
   8#include <linux/device.h>
   9#include <linux/hid.h>
  10#include <linux/module.h>
  11#include "hid-ids.h"
  12
  13MODULE_AUTHOR("Ben Chen");
  14MODULE_DESCRIPTION("CM6533 HID jack controls");
  15MODULE_LICENSE("GPL");
  16
  17#define CM6533_JD_TYPE_COUNT      1
  18#define CM6533_JD_RAWEV_LEN      16
  19#define CM6533_JD_SFX_OFFSET      8
  20
  21/*
  22*
  23*CM6533 audio jack HID raw events:
  24*
  25*Plug in:
  26*01000600 002083xx 080008c0 10000000
  27*about 3 seconds later...
  28*01000a00 002083xx 08000380 10000000
  29*01000600 002083xx 08000380 10000000
  30*
  31*Plug out:
  32*01000400 002083xx 080008c0 x0000000
  33*/
  34
  35static const u8 ji_sfx[] = { 0x08, 0x00, 0x08, 0xc0 };
  36static const u8 ji_in[]  = { 0x01, 0x00, 0x06, 0x00 };
  37static const u8 ji_out[] = { 0x01, 0x00, 0x04, 0x00 };
  38
  39static int jack_switch_types[CM6533_JD_TYPE_COUNT] = {
  40        SW_HEADPHONE_INSERT,
  41};
  42
  43struct cmhid {
  44        struct input_dev *input_dev;
  45        struct hid_device *hid;
  46        unsigned short switch_map[CM6533_JD_TYPE_COUNT];
  47};
  48
  49static void hp_ev(struct hid_device *hid, struct cmhid *cm, int value)
  50{
  51        input_report_switch(cm->input_dev, SW_HEADPHONE_INSERT, value);
  52        input_sync(cm->input_dev);
  53}
  54
  55static int cmhid_raw_event(struct hid_device *hid, struct hid_report *report,
  56         u8 *data, int len)
  57{
  58        struct cmhid *cm = hid_get_drvdata(hid);
  59
  60        if (len != CM6533_JD_RAWEV_LEN)
  61                goto out;
  62        if (memcmp(data+CM6533_JD_SFX_OFFSET, ji_sfx, sizeof(ji_sfx)))
  63                goto out;
  64
  65        if (!memcmp(data, ji_out, sizeof(ji_out))) {
  66                hp_ev(hid, cm, 0);
  67                goto out;
  68        }
  69        if (!memcmp(data, ji_in, sizeof(ji_in))) {
  70                hp_ev(hid, cm, 1);
  71                goto out;
  72        }
  73
  74out:
  75        return 0;
  76}
  77
  78static int cmhid_input_configured(struct hid_device *hid,
  79                struct hid_input *hidinput)
  80{
  81        struct input_dev *input_dev = hidinput->input;
  82        struct cmhid *cm = hid_get_drvdata(hid);
  83        int i;
  84
  85        cm->input_dev = input_dev;
  86        memcpy(cm->switch_map, jack_switch_types, sizeof(cm->switch_map));
  87        input_dev->evbit[0] = BIT(EV_SW);
  88        for (i = 0; i < CM6533_JD_TYPE_COUNT; i++)
  89                input_set_capability(cm->input_dev,
  90                                EV_SW, jack_switch_types[i]);
  91        return 0;
  92}
  93
  94static int cmhid_input_mapping(struct hid_device *hid,
  95                struct hid_input *hi, struct hid_field *field,
  96                struct hid_usage *usage, unsigned long **bit, int *max)
  97{
  98        return -1;
  99}
 100
 101static int cmhid_probe(struct hid_device *hid, const struct hid_device_id *id)
 102{
 103        int ret;
 104        struct cmhid *cm;
 105
 106        cm = kzalloc(sizeof(struct cmhid), GFP_KERNEL);
 107        if (!cm) {
 108                ret = -ENOMEM;
 109                goto allocfail;
 110        }
 111
 112        cm->hid = hid;
 113
 114        hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
 115        hid_set_drvdata(hid, cm);
 116
 117        ret = hid_parse(hid);
 118        if (ret) {
 119                hid_err(hid, "parse failed\n");
 120                goto fail;
 121        }
 122
 123        ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
 124        if (ret) {
 125                hid_err(hid, "hw start failed\n");
 126                goto fail;
 127        }
 128
 129        return 0;
 130fail:
 131        kfree(cm);
 132allocfail:
 133        return ret;
 134}
 135
 136static void cmhid_remove(struct hid_device *hid)
 137{
 138        struct cmhid *cm = hid_get_drvdata(hid);
 139
 140        hid_hw_stop(hid);
 141        kfree(cm);
 142}
 143
 144static const struct hid_device_id cmhid_devices[] = {
 145        { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
 146        { }
 147};
 148MODULE_DEVICE_TABLE(hid, cmhid_devices);
 149
 150static struct hid_driver cmhid_driver = {
 151        .name = "cm6533_jd",
 152        .id_table = cmhid_devices,
 153        .raw_event = cmhid_raw_event,
 154        .input_configured = cmhid_input_configured,
 155        .probe = cmhid_probe,
 156        .remove = cmhid_remove,
 157        .input_mapping = cmhid_input_mapping,
 158};
 159module_hid_driver(cmhid_driver);
 160
 161