270 lines
6.4 KiB
C
270 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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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u8 *buf_in;
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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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struct 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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ir_raw_event_overflow(ir->rc);
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}
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do {
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rawir.duration = ir->buf_in[i] * 85;
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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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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 && ret != -EPERM)
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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(struct timer_list *t)
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{
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struct igorplugusb *ir = from_timer(ir, t, timer);
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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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timer_setup(&ir->timer, igorplugusb_timer, 0);
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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(MAX_PACKET);
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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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ir->buf_in = kmalloc(MAX_PACKET, GFP_KERNEL);
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if (!ir->buf_in)
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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, MAX_PACKET, igorplugusb_callback, ir);
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usb_make_path(udev, ir->phys, sizeof(ir->phys));
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rc = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!rc)
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goto fail;
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rc->device_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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/*
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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_PROTO_BIT_ALL_IR_DECODER &
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~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |
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RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |
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RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |
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RC_PROTO_BIT_SONY20 | RC_PROTO_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_US(100);
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rc->rx_resolution = 85;
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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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usb_poison_urb(ir->urb);
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del_timer(&ir->timer);
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usb_unpoison_urb(ir->urb);
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usb_free_urb(ir->urb);
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rc_free_device(ir->rc);
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kfree(ir->buf_in);
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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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usb_poison_urb(ir->urb);
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del_timer_sync(&ir->timer);
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usb_set_intfdata(intf, NULL);
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usb_unpoison_urb(ir->urb);
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usb_free_urb(ir->urb);
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kfree(ir->buf_in);
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}
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static const 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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