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HID: cmedia: add support for HS-100B mute button

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These chips report mute button events in bit 4 of their report without it
being part of the report descriptor.
Use a custom descriptor that maps this bit.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Thomas Weißschuh 2021-07-20 22:27:08 +02:00 committed by Jiri Kosina
parent df04fbe868
commit bebf8820b3
3 changed files with 92 additions and 4 deletions
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5
drivers/hid/Kconfig
View File

@ -259,10 +259,11 @@ config HID_PRODIKEYS
and some additional multimedia keys.
config HID_CMEDIA
tristate "CMedia CM6533 HID audio jack controls"
tristate "CMedia audio chips"
depends on HID
help
Support for CMedia CM6533 HID audio jack controls.
Support for CMedia CM6533 HID audio jack controls
and HS100B mute buttons.
config HID_CP2112
tristate "Silicon Labs CP2112 HID USB-to-SMBus Bridge support"

90
drivers/hid/hid-cmedia.c
View File

@ -1,8 +1,10 @@
// 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>
@ -11,13 +13,53 @@
#include "hid-ids.h"
MODULE_AUTHOR("Ben Chen");
MODULE_DESCRIPTION("CM6533 HID jack controls");
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 __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:
@ -156,5 +198,49 @@ static struct hid_driver cmhid_driver = {
.remove = cmhid_remove,
.input_mapping = cmhid_input_mapping,
};
module_hid_driver(cmhid_driver);
static __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");
rdesc = hs100b_rdesc_fixed;
*rsize = sizeof(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);

1
drivers/hid/hid-ids.h
View File

@ -292,6 +292,7 @@
#define USB_VENDOR_ID_CMEDIA 0x0d8c
#define USB_DEVICE_ID_CM109 0x000e
#define USB_DEVICE_ID_CMEDIA_HS100B 0x0014
#define USB_DEVICE_ID_CM6533 0x0022
#define USB_VENDOR_ID_CODEMERCS 0x07c0