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![Sean Young](/assets/img/avatar_default.png)
Currently we do not know what variant (bit length) of the nec protocol is used, other than from guessing from the length of the scancode. Now nec will be handled the same way as the sony protocol or the rc6 protocol; one variant per bit length. In the future we might want to expose the rc protocol type to userspace and we don't want to be introducing this world of pain into userspace too. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
269 lines
6.6 KiB
C
269 lines
6.6 KiB
C
/*
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* IgorPlug-USB IR Receiver
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*
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* Copyright (C) 2014 Sean Young <sean@mess.org>
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*
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* Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.
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* See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
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*
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* Based on the lirc_igorplugusb.c driver:
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* Copyright (C) 2004 Jan M. Hochstein
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* <hochstein@algo.informatik.tu-darmstadt.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/kernel.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <media/rc-core.h>
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#define DRIVER_DESC "IgorPlug-USB IR Receiver"
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#define DRIVER_NAME "igorplugusb"
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#define HEADERLEN 3
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#define BUFLEN 36
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#define MAX_PACKET (HEADERLEN + BUFLEN)
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#define SET_INFRABUFFER_EMPTY 1
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#define GET_INFRACODE 2
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struct igorplugusb {
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struct rc_dev *rc;
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struct device *dev;
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struct urb *urb;
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struct usb_ctrlrequest request;
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struct timer_list timer;
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uint8_t buf_in[MAX_PACKET];
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char phys[64];
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};
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static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);
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static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)
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{
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DEFINE_IR_RAW_EVENT(rawir);
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unsigned i, start, overflow;
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dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);
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/*
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* If more than 36 pulses and spaces follow each other, the igorplugusb
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* overwrites its buffer from the beginning. The overflow value is the
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* last offset which was not overwritten. Everything from this offset
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* onwards occurred before everything until this offset.
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*/
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overflow = ir->buf_in[2];
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i = start = overflow + HEADERLEN;
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if (start >= len) {
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dev_err(ir->dev, "receive overflow invalid: %u", overflow);
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} else {
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if (overflow > 0)
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dev_warn(ir->dev, "receive overflow, at least %u lost",
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overflow);
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do {
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rawir.duration = ir->buf_in[i] * 85333;
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rawir.pulse = i & 1;
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ir_raw_event_store_with_filter(ir->rc, &rawir);
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if (++i == len)
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i = HEADERLEN;
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} while (i != start);
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/* add a trailing space */
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rawir.duration = ir->rc->timeout;
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rawir.pulse = false;
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ir_raw_event_store_with_filter(ir->rc, &rawir);
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ir_raw_event_handle(ir->rc);
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}
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igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
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}
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static void igorplugusb_callback(struct urb *urb)
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{
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struct usb_ctrlrequest *req;
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struct igorplugusb *ir = urb->context;
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req = (struct usb_ctrlrequest *)urb->setup_packet;
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switch (urb->status) {
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case 0:
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if (req->bRequest == GET_INFRACODE &&
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urb->actual_length > HEADERLEN)
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igorplugusb_irdata(ir, urb->actual_length);
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else /* request IR */
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mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));
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break;
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case -EPROTO:
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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usb_unlink_urb(urb);
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return;
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default:
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dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);
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igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
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break;
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}
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}
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static void igorplugusb_cmd(struct igorplugusb *ir, int cmd)
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{
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int ret;
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ir->request.bRequest = cmd;
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ir->urb->transfer_flags = 0;
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ret = usb_submit_urb(ir->urb, GFP_ATOMIC);
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if (ret)
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dev_err(ir->dev, "submit urb failed: %d", ret);
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}
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static void igorplugusb_timer(unsigned long data)
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{
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struct igorplugusb *ir = (struct igorplugusb *)data;
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igorplugusb_cmd(ir, GET_INFRACODE);
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}
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static int igorplugusb_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *udev;
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struct usb_host_interface *idesc;
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struct usb_endpoint_descriptor *ep;
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struct igorplugusb *ir;
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struct rc_dev *rc;
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int ret = -ENOMEM;
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udev = interface_to_usbdev(intf);
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idesc = intf->cur_altsetting;
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if (idesc->desc.bNumEndpoints != 1) {
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dev_err(&intf->dev, "incorrect number of endpoints");
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return -ENODEV;
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}
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ep = &idesc->endpoint[0].desc;
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if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {
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dev_err(&intf->dev, "endpoint incorrect");
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return -ENODEV;
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}
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ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);
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if (!ir)
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return -ENOMEM;
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ir->dev = &intf->dev;
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setup_timer(&ir->timer, igorplugusb_timer, (unsigned long)ir);
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ir->request.bRequest = GET_INFRACODE;
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ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;
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ir->request.wLength = cpu_to_le16(sizeof(ir->buf_in));
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ir->urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!ir->urb)
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goto fail;
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usb_fill_control_urb(ir->urb, udev,
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usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request,
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ir->buf_in, sizeof(ir->buf_in), igorplugusb_callback, ir);
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usb_make_path(udev, ir->phys, sizeof(ir->phys));
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rc = rc_allocate_device();
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if (!rc)
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goto fail;
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rc->input_name = DRIVER_DESC;
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rc->input_phys = ir->phys;
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usb_to_input_id(udev, &rc->input_id);
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rc->dev.parent = &intf->dev;
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rc->driver_type = RC_DRIVER_IR_RAW;
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/*
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* This device can only store 36 pulses + spaces, which is not enough
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* for the NEC protocol and many others.
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*/
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rc->allowed_protocols = RC_BIT_ALL & ~(RC_BIT_NEC | RC_BIT_NECX |
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RC_BIT_NEC32 | RC_BIT_RC6_6A_20 |
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RC_BIT_RC6_6A_24 | RC_BIT_RC6_6A_32 | RC_BIT_RC6_MCE |
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RC_BIT_SONY20 | RC_BIT_MCE_KBD | RC_BIT_SANYO);
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rc->priv = ir;
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rc->driver_name = DRIVER_NAME;
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rc->map_name = RC_MAP_HAUPPAUGE;
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rc->timeout = MS_TO_NS(100);
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rc->rx_resolution = 85333;
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ir->rc = rc;
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ret = rc_register_device(rc);
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if (ret) {
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dev_err(&intf->dev, "failed to register rc device: %d", ret);
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goto fail;
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}
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usb_set_intfdata(intf, ir);
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igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
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return 0;
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fail:
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rc_free_device(ir->rc);
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usb_free_urb(ir->urb);
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del_timer(&ir->timer);
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return ret;
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}
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static void igorplugusb_disconnect(struct usb_interface *intf)
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{
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struct igorplugusb *ir = usb_get_intfdata(intf);
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rc_unregister_device(ir->rc);
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del_timer_sync(&ir->timer);
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usb_set_intfdata(intf, NULL);
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usb_kill_urb(ir->urb);
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usb_free_urb(ir->urb);
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}
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static struct usb_device_id igorplugusb_table[] = {
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/* Igor Plug USB (Atmel's Manufact. ID) */
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{ USB_DEVICE(0x03eb, 0x0002) },
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/* Fit PC2 Infrared Adapter */
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{ USB_DEVICE(0x03eb, 0x21fe) },
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/* Terminating entry */
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{ }
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};
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static struct usb_driver igorplugusb_driver = {
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.name = DRIVER_NAME,
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.probe = igorplugusb_probe,
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.disconnect = igorplugusb_disconnect,
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.id_table = igorplugusb_table
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};
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module_usb_driver(igorplugusb_driver);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(usb, igorplugusb_table);
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