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>

1 files changed, 168 insertions, 0 deletions

diff --git a/drivers/hid/hid-cmedia.c b/drivers/hid/hid-cmedia.c
new file mode 100644
index 000000000000..7230f8513681
--- /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);
+