drivers/media/rc/igorplugusb.c

   1 /*
   2  * IgorPlug-USB IR Receiver
   3  *
   4  * Copyright (C) 2014 Sean Young <sean@mess.org>
   5  *
   6  * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.
   7  * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
   8  *
   9  * Based on the lirc_igorplugusb.c driver:
  10  *      Copyright (C) 2004 Jan M. Hochstein
  11  *      <hochstein@algo.informatik.tu-darmstadt.de>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  */
  23 #include <linux/device.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/usb.h>
  27 #include <linux/usb/input.h>
  28 #include <media/rc-core.h>
  29
  30 #define DRIVER_DESC             "IgorPlug-USB IR Receiver"
  31 #define DRIVER_NAME             "igorplugusb"
  32
  33 #define HEADERLEN               3
  34 #define BUFLEN                  36
  35 #define MAX_PACKET              (HEADERLEN + BUFLEN)
  36
  37 #define SET_INFRABUFFER_EMPTY   1
  38 #define GET_INFRACODE           2
  39
  40
  41 struct igorplugusb {
  42         struct rc_dev *rc;
  43         struct device *dev;
  44
  45         struct urb *urb;
  46         struct usb_ctrlrequest request;
  47
  48         struct timer_list timer;
  49
  50         uint8_t buf_in[MAX_PACKET];
  51
  52         char phys[64];
  53 };
  54
  55 static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);
  56
  57 static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)
  58 {
  59         DEFINE_IR_RAW_EVENT(rawir);
  60         unsigned i, start, overflow;
  61
  62         dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);
  63
  64         /*
  65          * If more than 36 pulses and spaces follow each other, the igorplugusb
  66          * overwrites its buffer from the beginning. The overflow value is the
  67          * last offset which was not overwritten. Everything from this offset
  68          * onwards occurred before everything until this offset.
  69          */
  70         overflow = ir->buf_in[2];
  71         i = start = overflow + HEADERLEN;
  72
  73         if (start >= len) {
  74                 dev_err(ir->dev, "receive overflow invalid: %u", overflow);
  75         } else {
  76                 if (overflow > 0)
  77                         dev_warn(ir->dev, "receive overflow, at least %u lost",
  78                                                                 overflow);
  79
  80                 do {
  81                         rawir.duration = ir->buf_in[i] * 85333;
  82                         rawir.pulse = i & 1;
  83
  84                         ir_raw_event_store_with_filter(ir->rc, &rawir);
  85
  86                         if (++i == len)
  87                                 i = HEADERLEN;
  88                 } while (i != start);
  89
  90                 /* add a trailing space */
  91                 rawir.duration = ir->rc->timeout;
  92                 rawir.pulse = false;
  93                 ir_raw_event_store_with_filter(ir->rc, &rawir);
  94
  95                 ir_raw_event_handle(ir->rc);
  96         }
  97
  98         igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
  99 }
 100
 101 static void igorplugusb_callback(struct urb *urb)
 102 {
 103         struct usb_ctrlrequest *req;
 104         struct igorplugusb *ir = urb->context;
 105
 106         req = (struct usb_ctrlrequest *)urb->setup_packet;
 107
 108         switch (urb->status) {
 109         case 0:
 110                 if (req->bRequest == GET_INFRACODE &&
 111                                         urb->actual_length > HEADERLEN)
 112                         igorplugusb_irdata(ir, urb->actual_length);
 113                 else /* request IR */
 114                         mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));
 115                 break;
 116         case -EPROTO:
 117         case -ECONNRESET:
 118         case -ENOENT:
 119         case -ESHUTDOWN:
 120                 usb_unlink_urb(urb);
 121                 return;
 122         default:
 123                 dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);
 124                 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
 125                 break;
 126         }
 127 }
 128
 129 static void igorplugusb_cmd(struct igorplugusb *ir, int cmd)
 130 {
 131         int ret;
 132
 133         ir->request.bRequest = cmd;
 134         ir->urb->transfer_flags = 0;
 135         ret = usb_submit_urb(ir->urb, GFP_ATOMIC);
 136         if (ret)
 137                 dev_err(ir->dev, "submit urb failed: %d", ret);
 138 }
 139
 140 static void igorplugusb_timer(struct timer_list *t)
 141 {
 142         struct igorplugusb *ir = from_timer(ir, t, timer);
 143
 144         igorplugusb_cmd(ir, GET_INFRACODE);
 145 }
 146
 147 static int igorplugusb_probe(struct usb_interface *intf,
 148                                         const struct usb_device_id *id)
 149 {
 150         struct usb_device *udev;
 151         struct usb_host_interface *idesc;
 152         struct usb_endpoint_descriptor *ep;
 153         struct igorplugusb *ir;
 154         struct rc_dev *rc;
 155         int ret = -ENOMEM;
 156
 157         udev = interface_to_usbdev(intf);
 158         idesc = intf->cur_altsetting;
 159
 160         if (idesc->desc.bNumEndpoints != 1) {
 161                 dev_err(&intf->dev, "incorrect number of endpoints");
 162                 return -ENODEV;
 163         }
 164
 165         ep = &idesc->endpoint[0].desc;
 166         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {
 167                 dev_err(&intf->dev, "endpoint incorrect");
 168                 return -ENODEV;
 169         }
 170
 171         ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);
 172         if (!ir)
 173                 return -ENOMEM;
 174
 175         ir->dev = &intf->dev;
 176
 177         timer_setup(&ir->timer, igorplugusb_timer, 0);
 178
 179         ir->request.bRequest = GET_INFRACODE;
 180         ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;
 181         ir->request.wLength = cpu_to_le16(sizeof(ir->buf_in));
 182
 183         ir->urb = usb_alloc_urb(0, GFP_KERNEL);
 184         if (!ir->urb)
 185                 goto fail;
 186
 187         usb_fill_control_urb(ir->urb, udev,
 188                 usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request,
 189                 ir->buf_in, sizeof(ir->buf_in), igorplugusb_callback, ir);
 190
 191         usb_make_path(udev, ir->phys, sizeof(ir->phys));
 192
 193         rc = rc_allocate_device(RC_DRIVER_IR_RAW);
 194         if (!rc)
 195                 goto fail;
 196
 197         rc->device_name = DRIVER_DESC;
 198         rc->input_phys = ir->phys;
 199         usb_to_input_id(udev, &rc->input_id);
 200         rc->dev.parent = &intf->dev;
 201         /*
 202          * This device can only store 36 pulses + spaces, which is not enough
 203          * for the NEC protocol and many others.
 204          */
 205         rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER &
 206                 ~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |
 207                   RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |
 208                   RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |
 209                   RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO);
 210
 211         rc->priv = ir;
 212         rc->driver_name = DRIVER_NAME;
 213         rc->map_name = RC_MAP_HAUPPAUGE;
 214         rc->timeout = MS_TO_NS(100);
 215         rc->rx_resolution = 85333;
 216
 217         ir->rc = rc;
 218         ret = rc_register_device(rc);
 219         if (ret) {
 220                 dev_err(&intf->dev, "failed to register rc device: %d", ret);
 221                 goto fail;
 222         }
 223
 224         usb_set_intfdata(intf, ir);
 225
 226         igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
 227
 228         return 0;
 229 fail:
 230         rc_free_device(ir->rc);
 231         usb_free_urb(ir->urb);
 232         del_timer(&ir->timer);
 233
 234         return ret;
 235 }
 236
 237 static void igorplugusb_disconnect(struct usb_interface *intf)
 238 {
 239         struct igorplugusb *ir = usb_get_intfdata(intf);
 240
 241         rc_unregister_device(ir->rc);
 242         del_timer_sync(&ir->timer);
 243         usb_set_intfdata(intf, NULL);
 244         usb_kill_urb(ir->urb);
 245         usb_free_urb(ir->urb);
 246 }
 247
 248 static const struct usb_device_id igorplugusb_table[] = {
 249         /* Igor Plug USB (Atmel's Manufact. ID) */
 250         { USB_DEVICE(0x03eb, 0x0002) },
 251         /* Fit PC2 Infrared Adapter */
 252         { USB_DEVICE(0x03eb, 0x21fe) },
 253         /* Terminating entry */
 254         { }
 255 };
 256
 257 static struct usb_driver igorplugusb_driver = {
 258         .name = DRIVER_NAME,
 259         .probe = igorplugusb_probe,
 260         .disconnect = igorplugusb_disconnect,
 261         .id_table = igorplugusb_table
 262 };
 263
 264 module_usb_driver(igorplugusb_driver);
 265
 266 MODULE_DESCRIPTION(DRIVER_DESC);
 267 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 268 MODULE_LICENSE("GPL");
 269 MODULE_DEVICE_TABLE(usb, igorplugusb_table);