This driver provides HID fixups for CMedia audio chips.
For now this enables the recognition of the microphone mute button for the
HS-100B.
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
drivers/hid/Kconfig | 6 +++
drivers/hid/Makefile | 1 +
drivers/hid/hid-cmedia-fixup.c | 82 ++++++++++++++++++++++++++++++++++
drivers/hid/hid-ids.h | 1 +
drivers/hid/hid-quirks.c | 3 ++
5 files changed, 93 insertions(+)
create mode 100644 drivers/hid/hid-cmedia-fixup.c
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 160554903ef9..5e139c93f75a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -264,6 +264,12 @@ config HID_CMEDIA
help
Support for CMedia CM6533 HID audio jack controls.
+config HID_CMEDIA_FIXUP
+ tristate "CMedia hid fixup"
+ depends on HID
+ help
+ Fixups for CMedia based audio chips.
+
config HID_CP2112
tristate "Silicon Labs CP2112 HID USB-to-SMBus Bridge support"
depends on USB_HID && HIDRAW && I2C && GPIOLIB
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 1ea1a7c0b20f..66d6b06ce4d2 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_HID_BIGBEN_FF) += hid-bigbenff.o
obj-$(CONFIG_HID_CHERRY) += hid-cherry.o
obj-$(CONFIG_HID_CHICONY) += hid-chicony.o
obj-$(CONFIG_HID_CMEDIA) += hid-cmedia.o
+obj-$(CONFIG_HID_CMEDIA_FIXUP) += hid-cmedia-fixup.o
obj-$(CONFIG_HID_CORSAIR) += hid-corsair.o
obj-$(CONFIG_HID_COUGAR) += hid-cougar.o
obj-$(CONFIG_HID_CP2112) += hid-cp2112.o
diff --git a/drivers/hid/hid-cmedia-fixup.c b/drivers/hid/hid-cmedia-fixup.c
new file mode 100644
index 000000000000..c9a984ea6f0a
--- /dev/null
+++ b/drivers/hid/hid-cmedia-fixup.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID driver containing fixups for CMedia audio chips.
+ *
+ * Copyright (C) 2021 Thomas Weißschuh <thomas@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include "hid-ids.h"
+
+#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 */
+};
+
+static __u8 *cmhid_fixup_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ switch (hdev->product) {
+ case USB_DEVICE_ID_CMEDIA_HS100B:
+ if (*rsize == HS100B_RDESC_ORIG_SIZE) {
+ hid_info(hdev, "Fixing CMedia HS-100B report descriptor\n");
+ rdesc = hs100b_rdesc_fixed;
+ *rsize = sizeof(hs100b_rdesc_fixed);
+ }
+ break;
+ }
+ return rdesc;
+}
+
+static const struct hid_device_id cmhid_fixup_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CMEDIA_HS100B) },
+ { }
+};
+
+static struct hid_driver cmhid_fixup_driver = {
+ .name = "cmedia_fixups",
+ .id_table = cmhid_fixup_devices,
+ .report_fixup = cmhid_fixup_report_fixup,
+};
+module_hid_driver(cmhid_fixup_driver);
+
+MODULE_DEVICE_TABLE(hid, cmhid_fixup_devices);
+MODULE_AUTHOR("Thomas Weißschuh <thomas@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("CMedia HID fixup");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 8f1893e68112..6864e4e6ac8b 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -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
diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
index 51b39bda9a9d..7776aa13ee27 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -346,6 +346,9 @@ static const struct hid_device_id hid_have_special_driver[] = {
#if IS_ENABLED(CONFIG_HID_CMEDIA)
{ HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
#endif
+#if IS_ENABLED(CONFIG_HID_CMEDIA_FIXUP)
+ { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CMEDIA_HS100B) },
+#endif
#if IS_ENABLED(CONFIG_HID_CORSAIR)
{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_K90) },
{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_GLAIVE_RGB) },
base-commit: df04fbe8680bfe07f3d7487eccff9f768bb02533
--
2.32.0
