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// SPDX-License-Identifier: GPL-2.0-only
/*
* HID driver for CMedia CM6533 audio jack controls
* and HS100B mute buttons
*
* Copyright (C) 2015 Ben Chen <ben_chen@bizlinktech.com>
* Copyright (C) 2021 Thomas Weißschuh <linux@weissschuh.net>
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"
MODULE_AUTHOR("Ben Chen");
MODULE_AUTHOR("Thomas Weißschuh");
MODULE_DESCRIPTION("CM6533 HID jack controls and HS100B mute button");
MODULE_LICENSE("GPL");
#define CM6533_JD_TYPE_COUNT 1
#define CM6533_JD_RAWEV_LEN 16
#define CM6533_JD_SFX_OFFSET 8
#define HS100B_RDESC_ORIG_SIZE 60
/* Fixed report descriptor of HS-100B audio chip
* Bit 4 is an abolute Microphone mute usage instead of being unassigned.
*/
static const __u8 hs100b_rdesc_fixed[] = {
0x05, 0x0C, /* Usage Page (Consumer), */
0x09, 0x01, /* Usage (Consumer Control), */
0xA1, 0x01, /* Collection (Application), */
0x15, 0x00, /* Logical Minimum (0), */
0x25, 0x01, /* Logical Maximum (1), */
0x09, 0xE9, /* Usage (Volume Inc), */
0x09, 0xEA, /* Usage (Volume Dec), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x02, /* Report Count (2), */
0x81, 0x02, /* Input (Variable), */
0x09, 0xE2, /* Usage (Mute), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x06, /* Input (Variable, Relative), */
0x05, 0x0B, /* Usage Page (Telephony), */
0x09, 0x2F, /* Usage (2Fh), */
0x81, 0x02, /* Input (Variable), */
0x09, 0x20, /* Usage (20h), */
0x81, 0x06, /* Input (Variable, Relative), */
0x05, 0x0C, /* Usage Page (Consumer), */
0x09, 0x00, /* Usage (00h), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x09, 0x00, /* Usage (00h), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x09, 0x00, /* Usage (00h), */
0x95, 0x04, /* Report Count (4), */
0x91, 0x02, /* Output (Variable), */
0xC0 /* End Collection */
};
/*
*
*CM6533 audio jack HID raw events:
*
*Plug in:
*01000600 002083xx 080008c0 10000000
*about 3 seconds later...
*01000a00 002083xx 08000380 10000000
*01000600 002083xx 08000380 10000000
*
*Plug out:
*01000400 002083xx 080008c0 x0000000
*/
static const u8 ji_sfx[] = { 0x08, 0x00, 0x08, 0xc0 };
static const u8 ji_in[] = { 0x01, 0x00, 0x06, 0x00 };
static const u8 ji_out[] = { 0x01, 0x00, 0x04, 0x00 };
static int jack_switch_types[CM6533_JD_TYPE_COUNT] = {
SW_HEADPHONE_INSERT,
};
struct cmhid {
struct input_dev *input_dev;
struct hid_device *hid;
unsigned short switch_map[CM6533_JD_TYPE_COUNT];
};
static void hp_ev(struct hid_device *hid, struct cmhid *cm, int value)
{
input_report_switch(cm->input_dev, SW_HEADPHONE_INSERT, value);
input_sync(cm->input_dev);
}
static int cmhid_raw_event(struct hid_device *hid, struct hid_report *report,
u8 *data, int len)
{
struct cmhid *cm = hid_get_drvdata(hid);
if (len != CM6533_JD_RAWEV_LEN)
goto out;
if (memcmp(data+CM6533_JD_SFX_OFFSET, ji_sfx, sizeof(ji_sfx)))
goto out;
if (!memcmp(data, ji_out, sizeof(ji_out))) {
hp_ev(hid, cm, 0);
goto out;
}
if (!memcmp(data, ji_in, sizeof(ji_in))) {
hp_ev(hid, cm, 1);
goto out;
}
out:
return 0;
}
static int cmhid_input_configured(struct hid_device *hid,
struct hid_input *hidinput)
{
struct input_dev *input_dev = hidinput->input;
struct cmhid *cm = hid_get_drvdata(hid);
int i;
cm->input_dev = input_dev;
memcpy(cm->switch_map, jack_switch_types, sizeof(cm->switch_map));
input_dev->evbit[0] = BIT(EV_SW);
for (i = 0; i < CM6533_JD_TYPE_COUNT; i++)
input_set_capability(cm->input_dev,
EV_SW, jack_switch_types[i]);
return 0;
}
static int cmhid_input_mapping(struct hid_device *hid,
struct hid_input *hi, struct hid_field *field,
struct hid_usage *usage, unsigned long **bit, int *max)
{
return -1;
}
static int cmhid_probe(struct hid_device *hid, const struct hid_device_id *id)
{
int ret;
struct cmhid *cm;
cm = kzalloc(sizeof(struct cmhid), GFP_KERNEL);
if (!cm) {
ret = -ENOMEM;
goto allocfail;
}
cm->hid = hid;
hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
hid_set_drvdata(hid, cm);
ret = hid_parse(hid);
if (ret) {
hid_err(hid, "parse failed\n");
goto fail;
}
ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
if (ret) {
hid_err(hid, "hw start failed\n");
goto fail;
}
return 0;
fail:
kfree(cm);
allocfail:
return ret;
}
static void cmhid_remove(struct hid_device *hid)
{
struct cmhid *cm = hid_get_drvdata(hid);
hid_hw_stop(hid);
kfree(cm);
}
static const struct hid_device_id cmhid_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
{ }
};
MODULE_DEVICE_TABLE(hid, cmhid_devices);
static struct hid_driver cmhid_driver = {
.name = "cm6533_jd",
.id_table = cmhid_devices,
.raw_event = cmhid_raw_event,
.input_configured = cmhid_input_configured,
.probe = cmhid_probe,
.remove = cmhid_remove,
.input_mapping = cmhid_input_mapping,
};
static const __u8 *cmhid_hs100b_report_fixup(struct hid_device *hid, __u8 *rdesc,
unsigned int *rsize)
{
if (*rsize == HS100B_RDESC_ORIG_SIZE) {
hid_info(hid, "Fixing CMedia HS-100B report descriptor\n");
*rsize = sizeof(hs100b_rdesc_fixed);
return hs100b_rdesc_fixed;
}
return rdesc;
}
static const struct hid_device_id cmhid_hs100b_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CMEDIA_HS100B) },
{ }
};
MODULE_DEVICE_TABLE(hid, cmhid_hs100b_devices);
static struct hid_driver cmhid_hs100b_driver = {
.name = "cmedia_hs100b",
.id_table = cmhid_hs100b_devices,
.report_fixup = cmhid_hs100b_report_fixup,
};
static int cmedia_init(void)
{
int ret;
ret = hid_register_driver(&cmhid_driver);
if (ret)
return ret;
ret = hid_register_driver(&cmhid_hs100b_driver);
if (ret)
hid_unregister_driver(&cmhid_driver);
return ret;
}
module_init(cmedia_init);
static void cmedia_exit(void)
{
hid_unregister_driver(&cmhid_driver);
hid_unregister_driver(&cmhid_hs100b_driver);
}
module_exit(cmedia_exit);
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