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authorThomas Weißschuh <linux@weissschuh.net>2021-07-20 22:27:08 +0200
committerJiri Kosina <jkosina@suse.cz>2021-07-28 11:51:07 +0200
commitbebf8820b355e6ac00487f3f36440d502eb4a44c (patch)
tree5f4da48bd7a39e05a7c6222057be98293387e46e /drivers/hid/hid-cmedia.c
parentdf04fbe8680bfe07f3d7487eccff9f768bb02533 (diff)
downloadlinux-bebf8820b355e6ac00487f3f36440d502eb4a44c.tar.bz2
HID: cmedia: add support for HS-100B mute button
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>
Diffstat (limited to 'drivers/hid/hid-cmedia.c')
-rw-r--r--drivers/hid/hid-cmedia.c90
1 files changed, 88 insertions, 2 deletions
diff --git a/drivers/hid/hid-cmedia.c b/drivers/hid/hid-cmedia.c
index 3296c5050264..cab42047bc99 100644
--- a/drivers/hid/hid-cmedia.c
+++ b/drivers/hid/hid-cmedia.c
@@ -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);