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/usb.h>
  25 #include <linux/usb/input.h>
  26 #include <media/rc-core.h>
  27
  28 #define DRIVER_NAME     "streamzap"
  29 #define DRIVER_DESC     "Streamzap Remote Control driver"
  30
  31 #define USB_STREAMZAP_VENDOR_ID         0x0e9c
  32 #define USB_STREAMZAP_PRODUCT_ID        0x0000
  33
  34 /* table of devices that work with this driver */
  35 static const struct usb_device_id streamzap_table[] = {
  36         /* Streamzap Remote Control */
  37         { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
  38         /* Terminating entry */
  39         { }
  40 };
  41
  42 MODULE_DEVICE_TABLE(usb, streamzap_table);
  43
  44 #define SZ_PULSE_MASK 0xf0
  45 #define SZ_SPACE_MASK 0x0f
  46 #define SZ_TIMEOUT    0xff
  47 #define SZ_RESOLUTION 256
  48
  49 /* number of samples buffered */
  50 #define SZ_BUF_LEN 128
  51
  52 enum StreamzapDecoderState {
  53         PulseSpace,
  54         FullPulse,
  55         FullSpace,
  56         IgnorePulse
  57 };
  58
  59 /* structure to hold our device specific stuff */
  60 struct streamzap_ir {
  61         /* ir-core */
  62         struct rc_dev *rdev;
  63
  64         /* core device info */
  65         struct device *dev;
  66
  67         /* usb */
  68         struct urb              *urb_in;
  69
  70         /* buffer & dma */
  71         unsigned char           *buf_in;
  72         dma_addr_t              dma_in;
  73         unsigned int            buf_in_len;
  74
  75         /* track what state we're in */
  76         enum StreamzapDecoderState decoder_state;
  77
  78         char                    phys[64];
  79 };
  80
  81
  82 /* local function prototypes */
  83 static int streamzap_probe(struct usb_interface *interface,
  84                            const struct usb_device_id *id);
  85 static void streamzap_disconnect(struct usb_interface *interface);
  86 static void streamzap_callback(struct urb *urb);
  87 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
  88 static int streamzap_resume(struct usb_interface *intf);
  89
  90 /* usb specific object needed to register this driver with the usb subsystem */
  91 static struct usb_driver streamzap_driver = {
  92         .name =         DRIVER_NAME,
  93         .probe =        streamzap_probe,
  94         .disconnect =   streamzap_disconnect,
  95         .suspend =      streamzap_suspend,
  96         .resume =       streamzap_resume,
  97         .id_table =     streamzap_table,
  98 };
  99
 100 static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
 101 {
 102         dev_dbg(sz->dev, "Storing %s with duration %u us\n",
 103                 (rawir.pulse ? "pulse" : "space"), rawir.duration);
 104         ir_raw_event_store_with_filter(sz->rdev, &rawir);
 105 }
 106
 107 static void sz_push_full_pulse(struct streamzap_ir *sz,
 108                                unsigned char value)
 109 {
 110         struct ir_raw_event rawir = {
 111                 .pulse = true,
 112                 .duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2,
 113         };
 114
 115         sz_push(sz, rawir);
 116 }
 117
 118 static void sz_push_half_pulse(struct streamzap_ir *sz,
 119                                unsigned char value)
 120 {
 121         sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
 122 }
 123
 124 static void sz_push_full_space(struct streamzap_ir *sz,
 125                                unsigned char value)
 126 {
 127         struct ir_raw_event rawir = {
 128                 .pulse = false,
 129                 .duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2,
 130         };
 131
 132         sz_push(sz, rawir);
 133 }
 134
 135 static void sz_push_half_space(struct streamzap_ir *sz,
 136                                unsigned long value)
 137 {
 138         sz_push_full_space(sz, value & SZ_SPACE_MASK);
 139 }
 140
 141 /*
 142  * streamzap_callback - usb IRQ handler callback
 143  *
 144  * This procedure is invoked on reception of data from
 145  * the usb remote.
 146  */
 147 static void streamzap_callback(struct urb *urb)
 148 {
 149         struct streamzap_ir *sz;
 150         unsigned int i;
 151         int len;
 152
 153         if (!urb)
 154                 return;
 155
 156         sz = urb->context;
 157         len = urb->actual_length;
 158
 159         switch (urb->status) {
 160         case -ECONNRESET:
 161         case -ENOENT:
 162         case -ESHUTDOWN:
 163                 /*
 164                  * this urb is terminated, clean up.
 165                  * sz might already be invalid at this point
 166                  */
 167                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
 168                 return;
 169         default:
 170                 break;
 171         }
 172
 173         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
 174         for (i = 0; i < len; i++) {
 175                 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
 176                         i, (unsigned char)sz->buf_in[i]);
 177                 switch (sz->decoder_state) {
 178                 case PulseSpace:
 179                         if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
 180                                 SZ_PULSE_MASK) {
 181                                 sz->decoder_state = FullPulse;
 182                                 continue;
 183                         } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
 184                                         == SZ_SPACE_MASK) {
 185                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 186                                 sz->decoder_state = FullSpace;
 187                                 continue;
 188                         } else {
 189                                 sz_push_half_pulse(sz, sz->buf_in[i]);
 190                                 sz_push_half_space(sz, sz->buf_in[i]);
 191                         }
 192                         break;
 193                 case FullPulse:
 194                         sz_push_full_pulse(sz, sz->buf_in[i]);
 195                         sz->decoder_state = IgnorePulse;
 196                         break;
 197                 case FullSpace:
 198                         if (sz->buf_in[i] == SZ_TIMEOUT) {
 199                                 struct ir_raw_event rawir = {
 200                                         .pulse = false,
 201                                         .duration = sz->rdev->timeout
 202                                 };
 203                                 sz_push(sz, rawir);
 204                         } else {
 205                                 sz_push_full_space(sz, sz->buf_in[i]);
 206                         }
 207                         sz->decoder_state = PulseSpace;
 208                         break;
 209                 case IgnorePulse:
 210                         if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
 211                                 SZ_SPACE_MASK) {
 212                                 sz->decoder_state = FullSpace;
 213                                 continue;
 214                         }
 215                         sz_push_half_space(sz, sz->buf_in[i]);
 216                         sz->decoder_state = PulseSpace;
 217                         break;
 218                 }
 219         }
 220
 221         ir_raw_event_handle(sz->rdev);
 222         usb_submit_urb(urb, GFP_ATOMIC);
 223 }
 224
 225 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz,
 226                                             struct usb_device *usbdev)
 227 {
 228         struct rc_dev *rdev;
 229         struct device *dev = sz->dev;
 230         int ret;
 231
 232         rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
 233         if (!rdev)
 234                 goto out;
 235
 236         usb_make_path(usbdev, sz->phys, sizeof(sz->phys));
 237         strlcat(sz->phys, "/input0", sizeof(sz->phys));
 238
 239         rdev->device_name = "Streamzap PC Remote Infrared Receiver";
 240         rdev->input_phys = sz->phys;
 241         usb_to_input_id(usbdev, &rdev->input_id);
 242         rdev->dev.parent = dev;
 243         rdev->priv = sz;
 244         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 245         rdev->driver_name = DRIVER_NAME;
 246         rdev->map_name = RC_MAP_STREAMZAP;
 247         rdev->rx_resolution = SZ_RESOLUTION;
 248
 249         ret = rc_register_device(rdev);
 250         if (ret < 0) {
 251                 dev_err(dev, "remote input device register failed\n");
 252                 goto out;
 253         }
 254
 255         return rdev;
 256
 257 out:
 258         rc_free_device(rdev);
 259         return NULL;
 260 }
 261
 262 /*
 263  *      streamzap_probe
 264  *
 265  *      Called by usb-core to associated with a candidate device
 266  *      On any failure the return value is the ERROR
 267  *      On success return 0
 268  */
 269 static int streamzap_probe(struct usb_interface *intf,
 270                            const struct usb_device_id *id)
 271 {
 272         struct usb_device *usbdev = interface_to_usbdev(intf);
 273         struct usb_endpoint_descriptor *endpoint;
 274         struct usb_host_interface *iface_host;
 275         struct streamzap_ir *sz = NULL;
 276         int retval = -ENOMEM;
 277         int pipe, maxp;
 278
 279         /* Allocate space for device driver specific data */
 280         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
 281         if (!sz)
 282                 return -ENOMEM;
 283
 284         /* Check to ensure endpoint information matches requirements */
 285         iface_host = intf->cur_altsetting;
 286
 287         if (iface_host->desc.bNumEndpoints != 1) {
 288                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
 289                         __func__, iface_host->desc.bNumEndpoints);
 290                 retval = -ENODEV;
 291                 goto free_sz;
 292         }
 293
 294         endpoint = &iface_host->endpoint[0].desc;
 295         if (!usb_endpoint_dir_in(endpoint)) {
 296                 dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n",
 297                         __func__, endpoint->bEndpointAddress);
 298                 retval = -ENODEV;
 299                 goto free_sz;
 300         }
 301
 302         if (!usb_endpoint_xfer_int(endpoint)) {
 303                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n",
 304                         __func__, endpoint->bmAttributes);
 305                 retval = -ENODEV;
 306                 goto free_sz;
 307         }
 308
 309         pipe = usb_rcvintpipe(usbdev, endpoint->bEndpointAddress);
 310         maxp = usb_maxpacket(usbdev, pipe);
 311
 312         if (maxp == 0) {
 313                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
 314                         __func__);
 315                 retval = -ENODEV;
 316                 goto free_sz;
 317         }
 318
 319         /* Allocate the USB buffer and IRQ URB */
 320         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
 321         if (!sz->buf_in)
 322                 goto free_sz;
 323
 324         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 325         if (!sz->urb_in)
 326                 goto free_buf_in;
 327
 328         sz->dev = &intf->dev;
 329         sz->buf_in_len = maxp;
 330
 331         sz->rdev = streamzap_init_rc_dev(sz, usbdev);
 332         if (!sz->rdev)
 333                 goto rc_dev_fail;
 334
 335         sz->decoder_state = PulseSpace;
 336         /* FIXME: don't yet have a way to set this */
 337         sz->rdev->timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 338         #if 0
 339         /* not yet supported, depends on patches from maxim */
 340         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
 341         sz->min_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 342         sz->max_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 343         #endif
 344
 345         /* Complete final initialisations */
 346         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
 347                          maxp, streamzap_callback, sz, endpoint->bInterval);
 348         sz->urb_in->transfer_dma = sz->dma_in;
 349         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 350
 351         usb_set_intfdata(intf, sz);
 352
 353         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
 354                 dev_err(sz->dev, "urb submit failed\n");
 355
 356         return 0;
 357
 358 rc_dev_fail:
 359         usb_free_urb(sz->urb_in);
 360 free_buf_in:
 361         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
 362 free_sz:
 363         kfree(sz);
 364
 365         return retval;
 366 }
 367
 368 /*
 369  * streamzap_disconnect
 370  *
 371  * Called by the usb core when the device is removed from the system.
 372  *
 373  * This routine guarantees that the driver will not submit any more urbs
 374  * by clearing dev->usbdev.  It is also supposed to terminate any currently
 375  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 376  * does not provide any way to do this.
 377  */
 378 static void streamzap_disconnect(struct usb_interface *interface)
 379 {
 380         struct streamzap_ir *sz = usb_get_intfdata(interface);
 381         struct usb_device *usbdev = interface_to_usbdev(interface);
 382
 383         usb_set_intfdata(interface, NULL);
 384
 385         if (!sz)
 386                 return;
 387
 388         rc_unregister_device(sz->rdev);
 389         usb_kill_urb(sz->urb_in);
 390         usb_free_urb(sz->urb_in);
 391         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
 392
 393         kfree(sz);
 394 }
 395
 396 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
 397 {
 398         struct streamzap_ir *sz = usb_get_intfdata(intf);
 399
 400         usb_kill_urb(sz->urb_in);
 401
 402         return 0;
 403 }
 404
 405 static int streamzap_resume(struct usb_interface *intf)
 406 {
 407         struct streamzap_ir *sz = usb_get_intfdata(intf);
 408
 409         if (usb_submit_urb(sz->urb_in, GFP_NOIO)) {
 410                 dev_err(sz->dev, "Error submitting urb\n");
 411                 return -EIO;
 412         }
 413
 414         return 0;
 415 }
 416
 417 module_usb_driver(streamzap_driver);
 418
 419 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
 420 MODULE_DESCRIPTION(DRIVER_DESC);
 421 MODULE_LICENSE("GPL");