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