drivers/media/rc/streamzap.c

   1 /*
   2  * Streamzap Remote Control driver
   3  *
   4  * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
   5  * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
   6  *
   7  * This driver was based on the work of Greg Wickham and Adrian
   8  * Dewhurst. It was substantially rewritten to support correct signal
   9  * gaps and now maintains a delay buffer, which is used to present
  10  * consistent timing behaviour to user space applications. Without the
  11  * delay buffer an ugly hack would be required in lircd, which can
  12  * cause sluggish signal decoding in certain situations.
  13  *
  14  * Ported to in-kernel ir-core interface by Jarod Wilson
  15  *
  16  * This driver is based on the USB skeleton driver packaged with the
  17  * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33
  34 #include <linux/device.h>
  35 #include <linux/module.h>
  36 #include <linux/slab.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/input.h>
  39 #include <media/rc-core.h>
  40
  41 #define DRIVER_VERSION  "1.61"
  42 #define DRIVER_NAME     "streamzap"
  43 #define DRIVER_DESC     "Streamzap Remote Control driver"
  44
  45 #ifdef CONFIG_USB_DEBUG
  46 static int debug = 1;
  47 #else
  48 static int debug;
  49 #endif
  50
  51 #define USB_STREAMZAP_VENDOR_ID         0x0e9c
  52 #define USB_STREAMZAP_PRODUCT_ID        0x0000
  53
  54 /* table of devices that work with this driver */
  55 static struct usb_device_id streamzap_table[] = {
  56         /* Streamzap Remote Control */
  57         { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
  58         /* Terminating entry */
  59         { }
  60 };
  61
  62 MODULE_DEVICE_TABLE(usb, streamzap_table);
  63
  64 #define SZ_PULSE_MASK 0xf0
  65 #define SZ_SPACE_MASK 0x0f
  66 #define SZ_TIMEOUT    0xff
  67 #define SZ_RESOLUTION 256
  68
  69 /* number of samples buffered */
  70 #define SZ_BUF_LEN 128
  71
  72 /* from ir-rc5-sz-decoder.c */
  73 #ifdef CONFIG_IR_RC5_SZ_DECODER_MODULE
  74 #define load_rc5_sz_decode()    request_module("ir-rc5-sz-decoder")
  75 #else
  76 #define load_rc5_sz_decode()    {}
  77 #endif
  78
  79 enum StreamzapDecoderState {
  80         PulseSpace,
  81         FullPulse,
  82         FullSpace,
  83         IgnorePulse
  84 };
  85
  86 /* structure to hold our device specific stuff */
  87 struct streamzap_ir {
  88         /* ir-core */
  89         struct rc_dev *rdev;
  90
  91         /* core device info */
  92         struct device *dev;
  93
  94         /* usb */
  95         struct usb_device       *usbdev;
  96         struct usb_interface    *interface;
  97         struct usb_endpoint_descriptor *endpoint;
  98         struct urb              *urb_in;
  99
 100         /* buffer & dma */
 101         unsigned char           *buf_in;
 102         dma_addr_t              dma_in;
 103         unsigned int            buf_in_len;
 104
 105         /* track what state we're in */
 106         enum StreamzapDecoderState decoder_state;
 107         /* tracks whether we are currently receiving some signal */
 108         bool                    idle;
 109         /* sum of signal lengths received since signal start */
 110         unsigned long           sum;
 111         /* start time of signal; necessary for gap tracking */
 112         struct timeval          signal_last;
 113         struct timeval          signal_start;
 114         bool                    timeout_enabled;
 115
 116         char                    name[128];
 117         char                    phys[64];
 118 };
 119
 120
 121 /* local function prototypes */
 122 static int streamzap_probe(struct usb_interface *interface,
 123                            const struct usb_device_id *id);
 124 static void streamzap_disconnect(struct usb_interface *interface);
 125 static void streamzap_callback(struct urb *urb);
 126 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
 127 static int streamzap_resume(struct usb_interface *intf);
 128
 129 /* usb specific object needed to register this driver with the usb subsystem */
 130 static struct usb_driver streamzap_driver = {
 131         .name =         DRIVER_NAME,
 132         .probe =        streamzap_probe,
 133         .disconnect =   streamzap_disconnect,
 134         .suspend =      streamzap_suspend,
 135         .resume =       streamzap_resume,
 136         .id_table =     streamzap_table,
 137 };
 138
 139 static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
 140 {
 141         dev_dbg(sz->dev, "Storing %s with duration %u us\n",
 142                 (rawir.pulse ? "pulse" : "space"), rawir.duration);
 143         ir_raw_event_store_with_filter(sz->rdev, &rawir);
 144 }
 145
 146 static void sz_push_full_pulse(struct streamzap_ir *sz,
 147                                unsigned char value)
 148 {
 149         DEFINE_IR_RAW_EVENT(rawir);
 150
 151         if (sz->idle) {
 152                 long deltv;
 153
 154                 sz->signal_last = sz->signal_start;
 155                 do_gettimeofday(&sz->signal_start);
 156
 157                 deltv = sz->signal_start.tv_sec - sz->signal_last.tv_sec;
 158                 rawir.pulse = false;
 159                 if (deltv > 15) {
 160                         /* really long time */
 161                         rawir.duration = IR_MAX_DURATION;
 162                 } else {
 163                         rawir.duration = (int)(deltv * 1000000 +
 164                                 sz->signal_start.tv_usec -
 165                                 sz->signal_last.tv_usec);
 166                         rawir.duration -= sz->sum;
 167                         rawir.duration = US_TO_NS(rawir.duration);
 168                         rawir.duration &= IR_MAX_DURATION;
 169                 }
 170                 sz_push(sz, rawir);
 171
 172                 sz->idle = false;
 173                 sz->sum = 0;
 174         }
 175
 176         rawir.pulse = true;
 177         rawir.duration = ((int) value) * SZ_RESOLUTION;
 178         rawir.duration += SZ_RESOLUTION / 2;
 179         sz->sum += rawir.duration;
 180         rawir.duration = US_TO_NS(rawir.duration);
 181         rawir.duration &= IR_MAX_DURATION;
 182         sz_push(sz, rawir);
 183 }
 184
 185 static void sz_push_half_pulse(struct streamzap_ir *sz,
 186                                unsigned char value)
 187 {
 188         sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
 189 }
 190
 191 static void sz_push_full_space(struct streamzap_ir *sz,
 192                                unsigned char value)
 193 {
 194         DEFINE_IR_RAW_EVENT(rawir);
 195
 196         rawir.pulse = false;
 197         rawir.duration = ((int) value) * SZ_RESOLUTION;
 198         rawir.duration += SZ_RESOLUTION / 2;
 199         sz->sum += rawir.duration;
 200         rawir.duration = US_TO_NS(rawir.duration);
 201         sz_push(sz, rawir);
 202 }
 203
 204 static void sz_push_half_space(struct streamzap_ir *sz,
 205                                unsigned long value)
 206 {
 207         sz_push_full_space(sz, value & SZ_SPACE_MASK);
 208 }
 209
 210 /**
 211  * streamzap_callback - usb IRQ handler callback
 212  *
 213  * This procedure is invoked on reception of data from
 214  * the usb remote.
 215  */
 216 static void streamzap_callback(struct urb *urb)
 217 {
 218         struct streamzap_ir *sz;
 219         unsigned int i;
 220         int len;
 221
 222         if (!urb)
 223                 return;
 224
 225         sz = urb->context;
 226         len = urb->actual_length;
 227
 228         switch (urb->status) {
 229         case -ECONNRESET:
 230         case -ENOENT:
 231         case -ESHUTDOWN:
 232                 /*
 233                  * this urb is terminated, clean up.
 234                  * sz might already be invalid at this point
 235                  */
 236                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
 237                 return;
 238         default:
 239                 break;
 240         }
 241
 242         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
 243         for (i = 0; i < len; i++) {
 244                 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
 245                         i, (unsigned char)sz->buf_in[i]);
 246                 switch (sz->decoder_state) {
 247                 case PulseSpace:
 248                         if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
 249                                 SZ_PULSE_MASK) {
 250                                 sz->decoder_state = FullPulse;
 251                                 continue;
 252                         } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
 253                                         == SZ_SPACE_MASK) {
 254                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 255                                 sz->decoder_state = FullSpace;
 256                                 continue;
 257                         } else {
 258                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 259                                 sz_push_half_space(sz, sz->buf_in[i]);
 260                         }
 261                         break;
 262                 case FullPulse:
 263                         sz_push_full_pulse(sz, sz->buf_in[i]);
 264                         sz->decoder_state = IgnorePulse;
 265                         break;
 266                 case FullSpace:
 267                         if (sz->buf_in[i] == SZ_TIMEOUT) {
 268                                 DEFINE_IR_RAW_EVENT(rawir);
 269
 270                                 rawir.pulse = false;
 271                                 rawir.duration = sz->rdev->timeout;
 272                                 sz->idle = true;
 273                                 if (sz->timeout_enabled)
 274                                         sz_push(sz, rawir);
 275                                 ir_raw_event_handle(sz->rdev);
 276                                 ir_raw_event_reset(sz->rdev);
 277                         } else {
 278                                 sz_push_full_space(sz, sz->buf_in[i]);
 279                         }
 280                         sz->decoder_state = PulseSpace;
 281                         break;
 282                 case IgnorePulse:
 283                         if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
 284                                 SZ_SPACE_MASK) {
 285                                 sz->decoder_state = FullSpace;
 286                                 continue;
 287                         }
 288                         sz_push_half_space(sz, sz->buf_in[i]);
 289                         sz->decoder_state = PulseSpace;
 290                         break;
 291                 }
 292         }
 293
 294         ir_raw_event_handle(sz->rdev);
 295         usb_submit_urb(urb, GFP_ATOMIC);
 296
 297         return;
 298 }
 299
 300 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
 301 {
 302         struct rc_dev *rdev;
 303         struct device *dev = sz->dev;
 304         int ret;
 305
 306         rdev = rc_allocate_device();
 307         if (!rdev) {
 308                 dev_err(dev, "remote dev allocation failed\n");
 309                 goto out;
 310         }
 311
 312         snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared "
 313                  "Receiver (%04x:%04x)",
 314                  le16_to_cpu(sz->usbdev->descriptor.idVendor),
 315                  le16_to_cpu(sz->usbdev->descriptor.idProduct));
 316         usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
 317         strlcat(sz->phys, "/input0", sizeof(sz->phys));
 318
 319         rdev->input_name = sz->name;
 320         rdev->input_phys = sz->phys;
 321         usb_to_input_id(sz->usbdev, &rdev->input_id);
 322         rdev->dev.parent = dev;
 323         rdev->priv = sz;
 324         rdev->driver_type = RC_DRIVER_IR_RAW;
 325         rdev->allowed_protos = RC_TYPE_ALL;
 326         rdev->driver_name = DRIVER_NAME;
 327         rdev->map_name = RC_MAP_STREAMZAP;
 328
 329         ret = rc_register_device(rdev);
 330         if (ret < 0) {
 331                 dev_err(dev, "remote input device register failed\n");
 332                 goto out;
 333         }
 334
 335         return rdev;
 336
 337 out:
 338         rc_free_device(rdev);
 339         return NULL;
 340 }
 341
 342 /**
 343  *      streamzap_probe
 344  *
 345  *      Called by usb-core to associated with a candidate device
 346  *      On any failure the return value is the ERROR
 347  *      On success return 0
 348  */
 349 static int __devinit streamzap_probe(struct usb_interface *intf,
 350                                      const struct usb_device_id *id)
 351 {
 352         struct usb_device *usbdev = interface_to_usbdev(intf);
 353         struct usb_host_interface *iface_host;
 354         struct streamzap_ir *sz = NULL;
 355         char buf[63], name[128] = "";
 356         int retval = -ENOMEM;
 357         int pipe, maxp;
 358
 359         /* Allocate space for device driver specific data */
 360         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
 361         if (!sz)
 362                 return -ENOMEM;
 363
 364         sz->usbdev = usbdev;
 365         sz->interface = intf;
 366
 367         /* Check to ensure endpoint information matches requirements */
 368         iface_host = intf->cur_altsetting;
 369
 370         if (iface_host->desc.bNumEndpoints != 1) {
 371                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
 372                         __func__, iface_host->desc.bNumEndpoints);
 373                 retval = -ENODEV;
 374                 goto free_sz;
 375         }
 376
 377         sz->endpoint = &(iface_host->endpoint[0].desc);
 378         if ((sz->endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
 379             != USB_DIR_IN) {
 380                 dev_err(&intf->dev, "%s: endpoint doesn't match input device "
 381                         "02%02x\n", __func__, sz->endpoint->bEndpointAddress);
 382                 retval = -ENODEV;
 383                 goto free_sz;
 384         }
 385
 386         if ((sz->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 387             != USB_ENDPOINT_XFER_INT) {
 388                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer "
 389                         "02%02x\n", __func__, sz->endpoint->bmAttributes);
 390                 retval = -ENODEV;
 391                 goto free_sz;
 392         }
 393
 394         pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
 395         maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
 396
 397         if (maxp == 0) {
 398                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
 399                         __func__);
 400                 retval = -ENODEV;
 401                 goto free_sz;
 402         }
 403
 404         /* Allocate the USB buffer and IRQ URB */
 405         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
 406         if (!sz->buf_in)
 407                 goto free_sz;
 408
 409         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 410         if (!sz->urb_in)
 411                 goto free_buf_in;
 412
 413         sz->dev = &intf->dev;
 414         sz->buf_in_len = maxp;
 415
 416         if (usbdev->descriptor.iManufacturer
 417             && usb_string(usbdev, usbdev->descriptor.iManufacturer,
 418                           buf, sizeof(buf)) > 0)
 419                 strlcpy(name, buf, sizeof(name));
 420
 421         if (usbdev->descriptor.iProduct
 422             && usb_string(usbdev, usbdev->descriptor.iProduct,
 423                           buf, sizeof(buf)) > 0)
 424                 snprintf(name + strlen(name), sizeof(name) - strlen(name),
 425                          " %s", buf);
 426
 427         sz->rdev = streamzap_init_rc_dev(sz);
 428         if (!sz->rdev)
 429                 goto rc_dev_fail;
 430
 431         sz->idle = true;
 432         sz->decoder_state = PulseSpace;
 433         /* FIXME: don't yet have a way to set this */
 434         sz->timeout_enabled = true;
 435         sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
 436                                 IR_MAX_DURATION) | 0x03000000);
 437         #if 0
 438         /* not yet supported, depends on patches from maxim */
 439         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
 440         sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
 441         sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
 442         #endif
 443
 444         do_gettimeofday(&sz->signal_start);
 445
 446         /* Complete final initialisations */
 447         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
 448                          maxp, (usb_complete_t)streamzap_callback,
 449                          sz, sz->endpoint->bInterval);
 450         sz->urb_in->transfer_dma = sz->dma_in;
 451         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 452
 453         usb_set_intfdata(intf, sz);
 454
 455         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
 456                 dev_err(sz->dev, "urb submit failed\n");
 457
 458         dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
 459                  usbdev->bus->busnum, usbdev->devnum);
 460
 461         /* Load the streamzap not-quite-rc5 decoder too */
 462         load_rc5_sz_decode();
 463
 464         return 0;
 465
 466 rc_dev_fail:
 467         usb_free_urb(sz->urb_in);
 468 free_buf_in:
 469         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
 470 free_sz:
 471         kfree(sz);
 472
 473         return retval;
 474 }
 475
 476 /**
 477  * streamzap_disconnect
 478  *
 479  * Called by the usb core when the device is removed from the system.
 480  *
 481  * This routine guarantees that the driver will not submit any more urbs
 482  * by clearing dev->usbdev.  It is also supposed to terminate any currently
 483  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 484  * does not provide any way to do this.
 485  */
 486 static void streamzap_disconnect(struct usb_interface *interface)
 487 {
 488         struct streamzap_ir *sz = usb_get_intfdata(interface);
 489         struct usb_device *usbdev = interface_to_usbdev(interface);
 490
 491         usb_set_intfdata(interface, NULL);
 492
 493         if (!sz)
 494                 return;
 495
 496         sz->usbdev = NULL;
 497         rc_unregister_device(sz->rdev);
 498         usb_kill_urb(sz->urb_in);
 499         usb_free_urb(sz->urb_in);
 500         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
 501
 502         kfree(sz);
 503 }
 504
 505 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
 506 {
 507         struct streamzap_ir *sz = usb_get_intfdata(intf);
 508
 509         usb_kill_urb(sz->urb_in);
 510
 511         return 0;
 512 }
 513
 514 static int streamzap_resume(struct usb_interface *intf)
 515 {
 516         struct streamzap_ir *sz = usb_get_intfdata(intf);
 517
 518         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
 519                 dev_err(sz->dev, "Error sumbiting urb\n");
 520                 return -EIO;
 521         }
 522
 523         return 0;
 524 }
 525
 526 module_usb_driver(streamzap_driver);
 527
 528 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
 529 MODULE_DESCRIPTION(DRIVER_DESC);
 530 MODULE_LICENSE("GPL");
 531
 532 module_param(debug, bool, S_IRUGO | S_IWUSR);
 533 MODULE_PARM_DESC(debug, "Enable debugging messages");