168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/*
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* HID driver for CMedia CM6533 audio jack controls
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*
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* Copyright (C) 2015 Ben Chen <ben_chen@bizlinktech.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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MODULE_AUTHOR("Ben Chen");
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MODULE_DESCRIPTION("CM6533 HID jack controls");
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MODULE_LICENSE("GPL");
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#define CM6533_JD_TYPE_COUNT 1
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#define CM6533_JD_RAWEV_LEN 16
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#define CM6533_JD_SFX_OFFSET 8
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/*
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*
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*CM6533 audio jack HID raw events:
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*
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*Plug in:
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*01000600 002083xx 080008c0 10000000
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*about 3 seconds later...
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*01000a00 002083xx 08000380 10000000
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*01000600 002083xx 08000380 10000000
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*
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*Plug out:
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*01000400 002083xx 080008c0 x0000000
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*/
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static const u8 ji_sfx[] = { 0x08, 0x00, 0x08, 0xc0 };
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static const u8 ji_in[] = { 0x01, 0x00, 0x06, 0x00 };
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static const u8 ji_out[] = { 0x01, 0x00, 0x04, 0x00 };
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static int jack_switch_types[CM6533_JD_TYPE_COUNT] = {
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SW_HEADPHONE_INSERT,
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};
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struct cmhid {
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struct input_dev *input_dev;
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struct hid_device *hid;
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unsigned short switch_map[CM6533_JD_TYPE_COUNT];
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};
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static void hp_ev(struct hid_device *hid, struct cmhid *cm, int value)
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{
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input_report_switch(cm->input_dev, SW_HEADPHONE_INSERT, value);
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input_sync(cm->input_dev);
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}
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static int cmhid_raw_event(struct hid_device *hid, struct hid_report *report,
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u8 *data, int len)
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{
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struct cmhid *cm = hid_get_drvdata(hid);
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if (len != CM6533_JD_RAWEV_LEN)
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goto out;
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if (memcmp(data+CM6533_JD_SFX_OFFSET, ji_sfx, sizeof(ji_sfx)))
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goto out;
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if (!memcmp(data, ji_out, sizeof(ji_out))) {
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hp_ev(hid, cm, 0);
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goto out;
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}
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if (!memcmp(data, ji_in, sizeof(ji_in))) {
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hp_ev(hid, cm, 1);
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goto out;
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}
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out:
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return 0;
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}
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static int cmhid_input_configured(struct hid_device *hid,
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struct hid_input *hidinput)
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{
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struct input_dev *input_dev = hidinput->input;
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struct cmhid *cm = hid_get_drvdata(hid);
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int i;
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cm->input_dev = input_dev;
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memcpy(cm->switch_map, jack_switch_types, sizeof(cm->switch_map));
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input_dev->evbit[0] = BIT(EV_SW);
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for (i = 0; i < CM6533_JD_TYPE_COUNT; i++)
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input_set_capability(cm->input_dev,
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EV_SW, jack_switch_types[i]);
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return 0;
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}
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static int cmhid_input_mapping(struct hid_device *hid,
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struct hid_input *hi, struct hid_field *field,
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struct hid_usage *usage, unsigned long **bit, int *max)
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{
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return -1;
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}
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static int cmhid_probe(struct hid_device *hid, const struct hid_device_id *id)
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{
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int ret;
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struct cmhid *cm;
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cm = kzalloc(sizeof(struct cmhid), GFP_KERNEL);
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if (!cm) {
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ret = -ENOMEM;
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goto allocfail;
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}
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cm->hid = hid;
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hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
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hid_set_drvdata(hid, cm);
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ret = hid_parse(hid);
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if (ret) {
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hid_err(hid, "parse failed\n");
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goto fail;
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}
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ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
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if (ret) {
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hid_err(hid, "hw start failed\n");
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goto fail;
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}
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return 0;
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fail:
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kfree(cm);
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allocfail:
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return ret;
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}
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static void cmhid_remove(struct hid_device *hid)
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{
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struct cmhid *cm = hid_get_drvdata(hid);
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hid_hw_stop(hid);
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kfree(cm);
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}
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static const struct hid_device_id cmhid_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM6533) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, cmhid_devices);
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static struct hid_driver cmhid_driver = {
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.name = "cm6533_jd",
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.id_table = cmhid_devices,
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.raw_event = cmhid_raw_event,
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.input_configured = cmhid_input_configured,
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.probe = cmhid_probe,
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.remove = cmhid_remove,
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.input_mapping = cmhid_input_mapping,
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};
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module_hid_driver(cmhid_driver);
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