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