diff options
Diffstat (limited to 'drivers/hid/hid-cmedia.c')
| -rw-r--r-- | drivers/hid/hid-cmedia.c | 168 |
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 000000000..7230f8513 --- /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); + |