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/*
* 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);
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