drivers/media/rc/streamzap.c

   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 = (rawir.duration > IR_MAX_DURATION) ?
 141                                          IR_MAX_DURATION : rawir.duration;
 142                 }
 143                 sz_push(sz, rawir);
 144
 145                 sz->idle = false;
 146                 sz->sum = 0;
 147         }
 148
 149         rawir.pulse = true;
 150         rawir.duration = ((int) value) * SZ_RESOLUTION;
 151         rawir.duration += SZ_RESOLUTION / 2;
 152         sz->sum += rawir.duration;
 153         rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
 154                          IR_MAX_DURATION : rawir.duration;
 155         sz_push(sz, rawir);
 156 }
 157
 158 static void sz_push_half_pulse(struct streamzap_ir *sz,
 159                                unsigned char value)
 160 {
 161         sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
 162 }
 163
 164 static void sz_push_full_space(struct streamzap_ir *sz,
 165                                unsigned char value)
 166 {
 167         struct ir_raw_event rawir = {};
 168
 169         rawir.pulse = false;
 170         rawir.duration = ((int) value) * SZ_RESOLUTION;
 171         rawir.duration += SZ_RESOLUTION / 2;
 172         sz->sum += rawir.duration;
 173         sz_push(sz, rawir);
 174 }
 175
 176 static void sz_push_half_space(struct streamzap_ir *sz,
 177                                unsigned long value)
 178 {
 179         sz_push_full_space(sz, value & SZ_SPACE_MASK);
 180 }
 181
 182 /*
 183  * streamzap_callback - usb IRQ handler callback
 184  *
 185  * This procedure is invoked on reception of data from
 186  * the usb remote.
 187  */
 188 static void streamzap_callback(struct urb *urb)
 189 {
 190         struct streamzap_ir *sz;
 191         unsigned int i;
 192         int len;
 193
 194         if (!urb)
 195                 return;
 196
 197         sz = urb->context;
 198         len = urb->actual_length;
 199
 200         switch (urb->status) {
 201         case -ECONNRESET:
 202         case -ENOENT:
 203         case -ESHUTDOWN:
 204                 /*
 205                  * this urb is terminated, clean up.
 206                  * sz might already be invalid at this point
 207                  */
 208                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
 209                 return;
 210         default:
 211                 break;
 212         }
 213
 214         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
 215         for (i = 0; i < len; i++) {
 216                 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
 217                         i, (unsigned char)sz->buf_in[i]);
 218                 switch (sz->decoder_state) {
 219                 case PulseSpace:
 220                         if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
 221                                 SZ_PULSE_MASK) {
 222                                 sz->decoder_state = FullPulse;
 223                                 continue;
 224                         } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
 225                                         == SZ_SPACE_MASK) {
 226                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 227                                 sz->decoder_state = FullSpace;
 228                                 continue;
 229                         } else {
 230                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 231                                 sz_push_half_space(sz, sz->buf_in[i]);
 232                         }
 233                         break;
 234                 case FullPulse:
 235                         sz_push_full_pulse(sz, sz->buf_in[i]);
 236                         sz->decoder_state = IgnorePulse;
 237                         break;
 238                 case FullSpace:
 239                         if (sz->buf_in[i] == SZ_TIMEOUT) {
 240                                 struct ir_raw_event rawir = {
 241                                         .pulse = false,
 242                                         .duration = sz->rdev->timeout
 243                                 };
 244                                 sz->idle = true;
 245                                 if (sz->timeout_enabled)
 246                                         sz_push(sz, rawir);
 247                                 ir_raw_event_handle(sz->rdev);
 248                                 ir_raw_event_reset(sz->rdev);
 249                         } else {
 250                                 sz_push_full_space(sz, sz->buf_in[i]);
 251                         }
 252                         sz->decoder_state = PulseSpace;
 253                         break;
 254                 case IgnorePulse:
 255                         if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
 256                                 SZ_SPACE_MASK) {
 257                                 sz->decoder_state = FullSpace;
 258                                 continue;
 259                         }
 260                         sz_push_half_space(sz, sz->buf_in[i]);
 261                         sz->decoder_state = PulseSpace;
 262                         break;
 263                 }
 264         }
 265
 266         ir_raw_event_handle(sz->rdev);
 267         usb_submit_urb(urb, GFP_ATOMIC);
 268
 269         return;
 270 }
 271
 272 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
 273 {
 274         struct rc_dev *rdev;
 275         struct device *dev = sz->dev;
 276         int ret;
 277
 278         rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
 279         if (!rdev) {
 280                 dev_err(dev, "remote dev allocation failed\n");
 281                 goto out;
 282         }
 283
 284         snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared Receiver (%04x:%04x)",
 285                  le16_to_cpu(sz->usbdev->descriptor.idVendor),
 286                  le16_to_cpu(sz->usbdev->descriptor.idProduct));
 287         usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
 288         strlcat(sz->phys, "/input0", sizeof(sz->phys));
 289
 290         rdev->device_name = sz->name;
 291         rdev->input_phys = sz->phys;
 292         usb_to_input_id(sz->usbdev, &rdev->input_id);
 293         rdev->dev.parent = dev;
 294         rdev->priv = sz;
 295         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 296         rdev->driver_name = DRIVER_NAME;
 297         rdev->map_name = RC_MAP_STREAMZAP;
 298
 299         ret = rc_register_device(rdev);
 300         if (ret < 0) {
 301                 dev_err(dev, "remote input device register failed\n");
 302                 goto out;
 303         }
 304
 305         return rdev;
 306
 307 out:
 308         rc_free_device(rdev);
 309         return NULL;
 310 }
 311
 312 /*
 313  *      streamzap_probe
 314  *
 315  *      Called by usb-core to associated with a candidate device
 316  *      On any failure the return value is the ERROR
 317  *      On success return 0
 318  */
 319 static int streamzap_probe(struct usb_interface *intf,
 320                            const struct usb_device_id *id)
 321 {
 322         struct usb_device *usbdev = interface_to_usbdev(intf);
 323         struct usb_host_interface *iface_host;
 324         struct streamzap_ir *sz = NULL;
 325         char buf[63], name[128] = "";
 326         int retval = -ENOMEM;
 327         int pipe, maxp;
 328
 329         /* Allocate space for device driver specific data */
 330         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
 331         if (!sz)
 332                 return -ENOMEM;
 333
 334         sz->usbdev = usbdev;
 335         sz->interface = intf;
 336
 337         /* Check to ensure endpoint information matches requirements */
 338         iface_host = intf->cur_altsetting;
 339
 340         if (iface_host->desc.bNumEndpoints != 1) {
 341                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
 342                         __func__, iface_host->desc.bNumEndpoints);
 343                 retval = -ENODEV;
 344                 goto free_sz;
 345         }
 346
 347         sz->endpoint = &(iface_host->endpoint[0].desc);
 348         if (!usb_endpoint_dir_in(sz->endpoint)) {
 349                 dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n",
 350                         __func__, sz->endpoint->bEndpointAddress);
 351                 retval = -ENODEV;
 352                 goto free_sz;
 353         }
 354
 355         if (!usb_endpoint_xfer_int(sz->endpoint)) {
 356                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n",
 357                         __func__, sz->endpoint->bmAttributes);
 358                 retval = -ENODEV;
 359                 goto free_sz;
 360         }
 361
 362         pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
 363         maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
 364
 365         if (maxp == 0) {
 366                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
 367                         __func__);
 368                 retval = -ENODEV;
 369                 goto free_sz;
 370         }
 371
 372         /* Allocate the USB buffer and IRQ URB */
 373         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
 374         if (!sz->buf_in)
 375                 goto free_sz;
 376
 377         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 378         if (!sz->urb_in)
 379                 goto free_buf_in;
 380
 381         sz->dev = &intf->dev;
 382         sz->buf_in_len = maxp;
 383
 384         if (usbdev->descriptor.iManufacturer
 385             && usb_string(usbdev, usbdev->descriptor.iManufacturer,
 386                           buf, sizeof(buf)) > 0)
 387                 strscpy(name, buf, sizeof(name));
 388
 389         if (usbdev->descriptor.iProduct
 390             && usb_string(usbdev, usbdev->descriptor.iProduct,
 391                           buf, sizeof(buf)) > 0)
 392                 snprintf(name + strlen(name), sizeof(name) - strlen(name),
 393                          " %s", buf);
 394
 395         sz->rdev = streamzap_init_rc_dev(sz);
 396         if (!sz->rdev)
 397                 goto rc_dev_fail;
 398
 399         sz->idle = true;
 400         sz->decoder_state = PulseSpace;
 401         /* FIXME: don't yet have a way to set this */
 402         sz->timeout_enabled = true;
 403         sz->rdev->timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 404         #if 0
 405         /* not yet supported, depends on patches from maxim */
 406         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
 407         sz->min_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 408         sz->max_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 409         #endif
 410
 411         sz->signal_start = ktime_get_real();
 412
 413         /* Complete final initialisations */
 414         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
 415                          maxp, (usb_complete_t)streamzap_callback,
 416                          sz, sz->endpoint->bInterval);
 417         sz->urb_in->transfer_dma = sz->dma_in;
 418         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 419
 420         usb_set_intfdata(intf, sz);
 421
 422         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
 423                 dev_err(sz->dev, "urb submit failed\n");
 424
 425         dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
 426                  usbdev->bus->busnum, usbdev->devnum);
 427
 428         return 0;
 429
 430 rc_dev_fail:
 431         usb_free_urb(sz->urb_in);
 432 free_buf_in:
 433         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
 434 free_sz:
 435         kfree(sz);
 436
 437         return retval;
 438 }
 439
 440 /*
 441  * streamzap_disconnect
 442  *
 443  * Called by the usb core when the device is removed from the system.
 444  *
 445  * This routine guarantees that the driver will not submit any more urbs
 446  * by clearing dev->usbdev.  It is also supposed to terminate any currently
 447  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 448  * does not provide any way to do this.
 449  */
 450 static void streamzap_disconnect(struct usb_interface *interface)
 451 {
 452         struct streamzap_ir *sz = usb_get_intfdata(interface);
 453         struct usb_device *usbdev = interface_to_usbdev(interface);
 454
 455         usb_set_intfdata(interface, NULL);
 456
 457         if (!sz)
 458                 return;
 459
 460         sz->usbdev = NULL;
 461         rc_unregister_device(sz->rdev);
 462         usb_kill_urb(sz->urb_in);
 463         usb_free_urb(sz->urb_in);
 464         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
 465
 466         kfree(sz);
 467 }
 468
 469 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
 470 {
 471         struct streamzap_ir *sz = usb_get_intfdata(intf);
 472
 473         usb_kill_urb(sz->urb_in);
 474
 475         return 0;
 476 }
 477
 478 static int streamzap_resume(struct usb_interface *intf)
 479 {
 480         struct streamzap_ir *sz = usb_get_intfdata(intf);
 481
 482         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
 483                 dev_err(sz->dev, "Error submitting urb\n");
 484                 return -EIO;
 485         }
 486
 487         return 0;
 488 }
 489
 490 module_usb_driver(streamzap_driver);
 491
 492 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
 493 MODULE_DESCRIPTION(DRIVER_DESC);
 494 MODULE_LICENSE("GPL");