HID: Support for CMedia CM6533 HID audio jack controls

The C-Media CM6533 is a USB audio chip featuring it's jack detection
capability.The device originates an interrupt transfer via HID interface each
time when a jack event occurs.  The purpose of this patch is to handle hid raw
events to keep the operating system informed of user interactions.

Signed-off-by: Ben Chen <ben_chen@bizlinktech.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 513a16cc6e18536e1e38e23bf2068b99bb65f197..411722570035b0c2d3375991e82008c0d61a08fc 100644 (file)
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -196,6 +196,12 @@ config HID_PRODIKEYS
          multimedia keyboard, but will lack support for the musical keyboard
          and some additional multimedia keys.
 
+config HID_CMEDIA
+       tristate "CMedia CM6533 HID audio jack controls"
+       depends on HID
+       ---help---
+       Support for CMedia CM6533 HID audio jack controls.
+
 config HID_CP2112
        tristate "Silicon Labs CP2112 HID USB-to-SMBus Bridge support"
        depends on USB_HID && I2C && GPIOLIB

diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 00011fee08b98f80fb032244041a1e3e7c45cb44..be56ab6f75a87c063229cb7bd39b5028c7d11ed9 100644 (file)
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_HID_BELKIN)      += hid-belkin.o
 obj-$(CONFIG_HID_BETOP_FF)     += hid-betopff.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_CORSAIR)      += hid-corsair.o
 obj-$(CONFIG_HID_CP2112)       += hid-cp2112.o
 obj-$(CONFIG_HID_CYPRESS)      += hid-cypress.o

diff --git a/drivers/hid/hid-cmedia.c b/drivers/hid/hid-cmedia.c
new file mode 100644 (file)
index 0000000..7230f85
--- /dev/null
+++ b/drivers/hid/hid-cmedia.c
@@ -0,0 +1,168 @@
+/*
+ * HID driver for CMedia CM6533 audio jack controls
+ *
+ * Copyright (C) 2015 Ben Chen <ben_chen@bizlinktech.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include "hid-ids.h"
+
+MODULE_AUTHOR("Ben Chen");
+MODULE_DESCRIPTION("CM6533 HID jack controls");
+MODULE_LICENSE("GPL");
+
+#define CM6533_JD_TYPE_COUNT      1
+#define CM6533_JD_RAWEV_LEN     16
+#define CM6533_JD_SFX_OFFSET     8
+
+/*
+*
+*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,
+};
+module_hid_driver(cmhid_driver);
+

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 7e89288b15375a2e8016ea6b31f5904e95c32719..e4e48dabf119a4db6aa15db69ae3b35a9e097f0f 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2051,6 +2051,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_WIIMOTE) },
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_WIIMOTE2) },
        { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLADE_14) },
+       { HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
        { }
 };
 

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index b6ff6e78ac54e281a8617212024147d63c891346..80a61c9063cc7a734649c927ad6b4d0a50dc0c5b 100644 (file)
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -246,6 +246,7 @@
 
 #define USB_VENDOR_ID_CMEDIA           0x0d8c
 #define USB_DEVICE_ID_CM109            0x000e
+#define USB_DEVICE_ID_CM6533           0x0022
 
 #define USB_VENDOR_ID_CODEMERCS                0x07c0
 #define USB_DEVICE_ID_CODEMERCS_IOW_FIRST      0x1500