drivers/media/rc/streamzap.c

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This source file includes following definitions.
sz_push
sz_push_full_pulse
sz_push_half_pulse
sz_push_full_space
sz_push_half_space
streamzap_callback
streamzap_init_rc_dev
streamzap_probe
streamzap_disconnect
streamzap_suspend
streamzap_resume
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Streamzap Remote Control driver
   4  *
   5  * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
   6  * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
   7  *
   8  * This driver was based on the work of Greg Wickham and Adrian
   9  * Dewhurst. It was substantially rewritten to support correct signal
  10  * gaps and now maintains a delay buffer, which is used to present
  11  * consistent timing behaviour to user space applications. Without the
  12  * delay buffer an ugly hack would be required in lircd, which can
  13  * cause sluggish signal decoding in certain situations.
  14  *
  15  * Ported to in-kernel ir-core interface by Jarod Wilson
  16  *
  17  * This driver is based on the USB skeleton driver packaged with the
  18  * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
  19  */
  20 
  21 #include <linux/device.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/ktime.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/input.h>
  27 #include <media/rc-core.h>
  28 
  29 #define DRIVER_VERSION  "1.61"
  30 #define DRIVER_NAME     "streamzap"
  31 #define DRIVER_DESC     "Streamzap Remote Control driver"
  32 
  33 #define USB_STREAMZAP_VENDOR_ID         0x0e9c
  34 #define USB_STREAMZAP_PRODUCT_ID        0x0000
  35 
  36 /* table of devices that work with this driver */
  37 static const struct usb_device_id streamzap_table[] = {
  38         /* Streamzap Remote Control */
  39         { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
  40         /* Terminating entry */
  41         { }
  42 };
  43 
  44 MODULE_DEVICE_TABLE(usb, streamzap_table);
  45 
  46 #define SZ_PULSE_MASK 0xf0
  47 #define SZ_SPACE_MASK 0x0f
  48 #define SZ_TIMEOUT    0xff
  49 #define SZ_RESOLUTION 256
  50 
  51 /* number of samples buffered */
  52 #define SZ_BUF_LEN 128
  53 
  54 enum StreamzapDecoderState {
  55         PulseSpace,
  56         FullPulse,
  57         FullSpace,
  58         IgnorePulse
  59 };
  60 
  61 /* structure to hold our device specific stuff */
  62 struct streamzap_ir {
  63         /* ir-core */
  64         struct rc_dev *rdev;
  65 
  66         /* core device info */
  67         struct device *dev;
  68 
  69         /* usb */
  70         struct usb_device       *usbdev;
  71         struct usb_interface    *interface;
  72         struct usb_endpoint_descriptor *endpoint;
  73         struct urb              *urb_in;
  74 
  75         /* buffer & dma */
  76         unsigned char           *buf_in;
  77         dma_addr_t              dma_in;
  78         unsigned int            buf_in_len;
  79 
  80         /* track what state we're in */
  81         enum StreamzapDecoderState decoder_state;
  82         /* tracks whether we are currently receiving some signal */
  83         bool                    idle;
  84         /* sum of signal lengths received since signal start */
  85         unsigned long           sum;
  86         /* start time of signal; necessary for gap tracking */
  87         ktime_t                 signal_last;
  88         ktime_t                 signal_start;
  89         bool                    timeout_enabled;
  90 
  91         char                    name[128];
  92         char                    phys[64];
  93 };
  94 
  95 
  96 /* local function prototypes */
  97 static int streamzap_probe(struct usb_interface *interface,
  98                            const struct usb_device_id *id);
  99 static void streamzap_disconnect(struct usb_interface *interface);
 100 static void streamzap_callback(struct urb *urb);
 101 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
 102 static int streamzap_resume(struct usb_interface *intf);
 103 
 104 /* usb specific object needed to register this driver with the usb subsystem */
 105 static struct usb_driver streamzap_driver = {
 106         .name =         DRIVER_NAME,
 107         .probe =        streamzap_probe,
 108         .disconnect =   streamzap_disconnect,
 109         .suspend =      streamzap_suspend,
 110         .resume =       streamzap_resume,
 111         .id_table =     streamzap_table,
 112 };
 113 
 114 static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
 115 {
 116         dev_dbg(sz->dev, "Storing %s with duration %u us\n",
 117                 (rawir.pulse ? "pulse" : "space"), rawir.duration);
 118         ir_raw_event_store_with_filter(sz->rdev, &rawir);
 119 }
 120 
 121 static void sz_push_full_pulse(struct streamzap_ir *sz,
 122                                unsigned char value)
 123 {
 124         struct ir_raw_event rawir = {};
 125 
 126         if (sz->idle) {
 127                 int delta;
 128 
 129                 sz->signal_last = sz->signal_start;
 130                 sz->signal_start = ktime_get_real();
 131 
 132                 delta = ktime_us_delta(sz->signal_start, sz->signal_last);
 133                 rawir.pulse = false;
 134                 if (delta > (15 * USEC_PER_SEC)) {
 135                         /* really long time */
 136                         rawir.duration = IR_MAX_DURATION;
 137                 } else {
 138                         rawir.duration = delta;
 139                         rawir.duration -= sz->sum;
 140                         rawir.duration = US_TO_NS(rawir.duration);
 141                         rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
 142                                          IR_MAX_DURATION : rawir.duration;
 143                 }
 144                 sz_push(sz, rawir);
 145 
 146                 sz->idle = false;
 147                 sz->sum = 0;
 148         }
 149 
 150         rawir.pulse = true;
 151         rawir.duration = ((int) value) * SZ_RESOLUTION;
 152         rawir.duration += SZ_RESOLUTION / 2;
 153         sz->sum += rawir.duration;
 154         rawir.duration = US_TO_NS(rawir.duration);
 155         rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
 156                          IR_MAX_DURATION : rawir.duration;
 157         sz_push(sz, rawir);
 158 }
 159 
 160 static void sz_push_half_pulse(struct streamzap_ir *sz,
 161                                unsigned char value)
 162 {
 163         sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
 164 }
 165 
 166 static void sz_push_full_space(struct streamzap_ir *sz,
 167                                unsigned char value)
 168 {
 169         struct ir_raw_event rawir = {};
 170 
 171         rawir.pulse = false;
 172         rawir.duration = ((int) value) * SZ_RESOLUTION;
 173         rawir.duration += SZ_RESOLUTION / 2;
 174         sz->sum += rawir.duration;
 175         rawir.duration = US_TO_NS(rawir.duration);
 176         sz_push(sz, rawir);
 177 }
 178 
 179 static void sz_push_half_space(struct streamzap_ir *sz,
 180                                unsigned long value)
 181 {
 182         sz_push_full_space(sz, value & SZ_SPACE_MASK);
 183 }
 184 
 185 /*
 186  * streamzap_callback - usb IRQ handler callback
 187  *
 188  * This procedure is invoked on reception of data from
 189  * the usb remote.
 190  */
 191 static void streamzap_callback(struct urb *urb)
 192 {
 193         struct streamzap_ir *sz;
 194         unsigned int i;
 195         int len;
 196 
 197         if (!urb)
 198                 return;
 199 
 200         sz = urb->context;
 201         len = urb->actual_length;
 202 
 203         switch (urb->status) {
 204         case -ECONNRESET:
 205         case -ENOENT:
 206         case -ESHUTDOWN:
 207                 /*
 208                  * this urb is terminated, clean up.
 209                  * sz might already be invalid at this point
 210                  */
 211                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
 212                 return;
 213         default:
 214                 break;
 215         }
 216 
 217         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
 218         for (i = 0; i < len; i++) {
 219                 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
 220                         i, (unsigned char)sz->buf_in[i]);
 221                 switch (sz->decoder_state) {
 222                 case PulseSpace:
 223                         if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
 224                                 SZ_PULSE_MASK) {
 225                                 sz->decoder_state = FullPulse;
 226                                 continue;
 227                         } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
 228                                         == SZ_SPACE_MASK) {
 229                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 230                                 sz->decoder_state = FullSpace;
 231                                 continue;
 232                         } else {
 233                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 234                                 sz_push_half_space(sz, sz->buf_in[i]);
 235                         }
 236                         break;
 237                 case FullPulse:
 238                         sz_push_full_pulse(sz, sz->buf_in[i]);
 239                         sz->decoder_state = IgnorePulse;
 240                         break;
 241                 case FullSpace:
 242                         if (sz->buf_in[i] == SZ_TIMEOUT) {
 243                                 struct ir_raw_event rawir = {
 244                                         .pulse = false,
 245                                         .duration = sz->rdev->timeout
 246                                 };
 247                                 sz->idle = true;
 248                                 if (sz->timeout_enabled)
 249                                         sz_push(sz, rawir);
 250                                 ir_raw_event_handle(sz->rdev);
 251                                 ir_raw_event_reset(sz->rdev);
 252                         } else {
 253                                 sz_push_full_space(sz, sz->buf_in[i]);
 254                         }
 255                         sz->decoder_state = PulseSpace;
 256                         break;
 257                 case IgnorePulse:
 258                         if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
 259                                 SZ_SPACE_MASK) {
 260                                 sz->decoder_state = FullSpace;
 261                                 continue;
 262                         }
 263                         sz_push_half_space(sz, sz->buf_in[i]);
 264                         sz->decoder_state = PulseSpace;
 265                         break;
 266                 }
 267         }
 268 
 269         ir_raw_event_handle(sz->rdev);
 270         usb_submit_urb(urb, GFP_ATOMIC);
 271 
 272         return;
 273 }
 274 
 275 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
 276 {
 277         struct rc_dev *rdev;
 278         struct device *dev = sz->dev;
 279         int ret;
 280 
 281         rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
 282         if (!rdev) {
 283                 dev_err(dev, "remote dev allocation failed\n");
 284                 goto out;
 285         }
 286 
 287         snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared Receiver (%04x:%04x)",
 288                  le16_to_cpu(sz->usbdev->descriptor.idVendor),
 289                  le16_to_cpu(sz->usbdev->descriptor.idProduct));
 290         usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
 291         strlcat(sz->phys, "/input0", sizeof(sz->phys));
 292 
 293         rdev->device_name = sz->name;
 294         rdev->input_phys = sz->phys;
 295         usb_to_input_id(sz->usbdev, &rdev->input_id);
 296         rdev->dev.parent = dev;
 297         rdev->priv = sz;
 298         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 299         rdev->driver_name = DRIVER_NAME;
 300         rdev->map_name = RC_MAP_STREAMZAP;
 301 
 302         ret = rc_register_device(rdev);
 303         if (ret < 0) {
 304                 dev_err(dev, "remote input device register failed\n");
 305                 goto out;
 306         }
 307 
 308         return rdev;
 309 
 310 out:
 311         rc_free_device(rdev);
 312         return NULL;
 313 }
 314 
 315 /*
 316  *      streamzap_probe
 317  *
 318  *      Called by usb-core to associated with a candidate device
 319  *      On any failure the return value is the ERROR
 320  *      On success return 0
 321  */
 322 static int streamzap_probe(struct usb_interface *intf,
 323                            const struct usb_device_id *id)
 324 {
 325         struct usb_device *usbdev = interface_to_usbdev(intf);
 326         struct usb_host_interface *iface_host;
 327         struct streamzap_ir *sz = NULL;
 328         char buf[63], name[128] = "";
 329         int retval = -ENOMEM;
 330         int pipe, maxp;
 331 
 332         /* Allocate space for device driver specific data */
 333         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
 334         if (!sz)
 335                 return -ENOMEM;
 336 
 337         sz->usbdev = usbdev;
 338         sz->interface = intf;
 339 
 340         /* Check to ensure endpoint information matches requirements */
 341         iface_host = intf->cur_altsetting;
 342 
 343         if (iface_host->desc.bNumEndpoints != 1) {
 344                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
 345                         __func__, iface_host->desc.bNumEndpoints);
 346                 retval = -ENODEV;
 347                 goto free_sz;
 348         }
 349 
 350         sz->endpoint = &(iface_host->endpoint[0].desc);
 351         if (!usb_endpoint_dir_in(sz->endpoint)) {
 352                 dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n",
 353                         __func__, sz->endpoint->bEndpointAddress);
 354                 retval = -ENODEV;
 355                 goto free_sz;
 356         }
 357 
 358         if (!usb_endpoint_xfer_int(sz->endpoint)) {
 359                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n",
 360                         __func__, sz->endpoint->bmAttributes);
 361                 retval = -ENODEV;
 362                 goto free_sz;
 363         }
 364 
 365         pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
 366         maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
 367 
 368         if (maxp == 0) {
 369                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
 370                         __func__);
 371                 retval = -ENODEV;
 372                 goto free_sz;
 373         }
 374 
 375         /* Allocate the USB buffer and IRQ URB */
 376         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
 377         if (!sz->buf_in)
 378                 goto free_sz;
 379 
 380         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 381         if (!sz->urb_in)
 382                 goto free_buf_in;
 383 
 384         sz->dev = &intf->dev;
 385         sz->buf_in_len = maxp;
 386 
 387         if (usbdev->descriptor.iManufacturer
 388             && usb_string(usbdev, usbdev->descriptor.iManufacturer,
 389                           buf, sizeof(buf)) > 0)
 390                 strscpy(name, buf, sizeof(name));
 391 
 392         if (usbdev->descriptor.iProduct
 393             && usb_string(usbdev, usbdev->descriptor.iProduct,
 394                           buf, sizeof(buf)) > 0)
 395                 snprintf(name + strlen(name), sizeof(name) - strlen(name),
 396                          " %s", buf);
 397 
 398         sz->rdev = streamzap_init_rc_dev(sz);
 399         if (!sz->rdev)
 400                 goto rc_dev_fail;
 401 
 402         sz->idle = true;
 403         sz->decoder_state = PulseSpace;
 404         /* FIXME: don't yet have a way to set this */
 405         sz->timeout_enabled = true;
 406         sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
 407                                 IR_MAX_DURATION) | 0x03000000);
 408         #if 0
 409         /* not yet supported, depends on patches from maxim */
 410         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
 411         sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
 412         sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
 413         #endif
 414 
 415         sz->signal_start = ktime_get_real();
 416 
 417         /* Complete final initialisations */
 418         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
 419                          maxp, (usb_complete_t)streamzap_callback,
 420                          sz, sz->endpoint->bInterval);
 421         sz->urb_in->transfer_dma = sz->dma_in;
 422         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 423 
 424         usb_set_intfdata(intf, sz);
 425 
 426         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
 427                 dev_err(sz->dev, "urb submit failed\n");
 428 
 429         dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
 430                  usbdev->bus->busnum, usbdev->devnum);
 431 
 432         return 0;
 433 
 434 rc_dev_fail:
 435         usb_free_urb(sz->urb_in);
 436 free_buf_in:
 437         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
 438 free_sz:
 439         kfree(sz);
 440 
 441         return retval;
 442 }
 443 
 444 /*
 445  * streamzap_disconnect
 446  *
 447  * Called by the usb core when the device is removed from the system.
 448  *
 449  * This routine guarantees that the driver will not submit any more urbs
 450  * by clearing dev->usbdev.  It is also supposed to terminate any currently
 451  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 452  * does not provide any way to do this.
 453  */
 454 static void streamzap_disconnect(struct usb_interface *interface)
 455 {
 456         struct streamzap_ir *sz = usb_get_intfdata(interface);
 457         struct usb_device *usbdev = interface_to_usbdev(interface);
 458 
 459         usb_set_intfdata(interface, NULL);
 460 
 461         if (!sz)
 462                 return;
 463 
 464         sz->usbdev = NULL;
 465         rc_unregister_device(sz->rdev);
 466         usb_kill_urb(sz->urb_in);
 467         usb_free_urb(sz->urb_in);
 468         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
 469 
 470         kfree(sz);
 471 }
 472 
 473 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
 474 {
 475         struct streamzap_ir *sz = usb_get_intfdata(intf);
 476 
 477         usb_kill_urb(sz->urb_in);
 478 
 479         return 0;
 480 }
 481 
 482 static int streamzap_resume(struct usb_interface *intf)
 483 {
 484         struct streamzap_ir *sz = usb_get_intfdata(intf);
 485 
 486         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
 487                 dev_err(sz->dev, "Error submitting urb\n");
 488                 return -EIO;
 489         }
 490 
 491         return 0;
 492 }
 493 
 494 module_usb_driver(streamzap_driver);
 495 
 496 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
 497 MODULE_DESCRIPTION(DRIVER_DESC);
 498 MODULE_LICENSE("GPL");
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root/drivers/media/rc/streamzap.c

DEFINITIONS
