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Linux/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 &= IR_MAX_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 &= IR_MAX_DURATION;
169         sz_push(sz, rawir);
170 }
171 
172 static void sz_push_half_pulse(struct streamzap_ir *sz,
173                                unsigned char value)
174 {
175         sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
176 }
177 
178 static void sz_push_full_space(struct streamzap_ir *sz,
179                                unsigned char value)
180 {
181         DEFINE_IR_RAW_EVENT(rawir);
182 
183         rawir.pulse = false;
184         rawir.duration = ((int) value) * SZ_RESOLUTION;
185         rawir.duration += SZ_RESOLUTION / 2;
186         sz->sum += rawir.duration;
187         rawir.duration = US_TO_NS(rawir.duration);
188         sz_push(sz, rawir);
189 }
190 
191 static void sz_push_half_space(struct streamzap_ir *sz,
192                                unsigned long value)
193 {
194         sz_push_full_space(sz, value & SZ_SPACE_MASK);
195 }
196 
197 /**
198  * streamzap_callback - usb IRQ handler callback
199  *
200  * This procedure is invoked on reception of data from
201  * the usb remote.
202  */
203 static void streamzap_callback(struct urb *urb)
204 {
205         struct streamzap_ir *sz;
206         unsigned int i;
207         int len;
208 
209         if (!urb)
210                 return;
211 
212         sz = urb->context;
213         len = urb->actual_length;
214 
215         switch (urb->status) {
216         case -ECONNRESET:
217         case -ENOENT:
218         case -ESHUTDOWN:
219                 /*
220                  * this urb is terminated, clean up.
221                  * sz might already be invalid at this point
222                  */
223                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
224                 return;
225         default:
226                 break;
227         }
228 
229         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
230         for (i = 0; i < len; i++) {
231                 dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
232                         i, (unsigned char)sz->buf_in[i]);
233                 switch (sz->decoder_state) {
234                 case PulseSpace:
235                         if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
236                                 SZ_PULSE_MASK) {
237                                 sz->decoder_state = FullPulse;
238                                 continue;
239                         } else if ((sz->buf_in[i] & SZ_SPACE_MASK)
240                                         == SZ_SPACE_MASK) {
241                                 sz_push_half_pulse(sz, sz->buf_in[i]);
242                                 sz->decoder_state = FullSpace;
243                                 continue;
244                         } else {
245                                 sz_push_half_pulse(sz, sz->buf_in[i]);
246                                 sz_push_half_space(sz, sz->buf_in[i]);
247                         }
248                         break;
249                 case FullPulse:
250                         sz_push_full_pulse(sz, sz->buf_in[i]);
251                         sz->decoder_state = IgnorePulse;
252                         break;
253                 case FullSpace:
254                         if (sz->buf_in[i] == SZ_TIMEOUT) {
255                                 DEFINE_IR_RAW_EVENT(rawir);
256 
257                                 rawir.pulse = false;
258                                 rawir.duration = sz->rdev->timeout;
259                                 sz->idle = true;
260                                 if (sz->timeout_enabled)
261                                         sz_push(sz, rawir);
262                                 ir_raw_event_handle(sz->rdev);
263                                 ir_raw_event_reset(sz->rdev);
264                         } else {
265                                 sz_push_full_space(sz, sz->buf_in[i]);
266                         }
267                         sz->decoder_state = PulseSpace;
268                         break;
269                 case IgnorePulse:
270                         if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
271                                 SZ_SPACE_MASK) {
272                                 sz->decoder_state = FullSpace;
273                                 continue;
274                         }
275                         sz_push_half_space(sz, sz->buf_in[i]);
276                         sz->decoder_state = PulseSpace;
277                         break;
278                 }
279         }
280 
281         ir_raw_event_handle(sz->rdev);
282         usb_submit_urb(urb, GFP_ATOMIC);
283 
284         return;
285 }
286 
287 static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
288 {
289         struct rc_dev *rdev;
290         struct device *dev = sz->dev;
291         int ret;
292 
293         rdev = rc_allocate_device();
294         if (!rdev) {
295                 dev_err(dev, "remote dev allocation failed\n");
296                 goto out;
297         }
298 
299         snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared "
300                  "Receiver (%04x:%04x)",
301                  le16_to_cpu(sz->usbdev->descriptor.idVendor),
302                  le16_to_cpu(sz->usbdev->descriptor.idProduct));
303         usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
304         strlcat(sz->phys, "/input0", sizeof(sz->phys));
305 
306         rdev->input_name = sz->name;
307         rdev->input_phys = sz->phys;
308         usb_to_input_id(sz->usbdev, &rdev->input_id);
309         rdev->dev.parent = dev;
310         rdev->priv = sz;
311         rdev->driver_type = RC_DRIVER_IR_RAW;
312         rdev->allowed_protocols = RC_BIT_ALL;
313         rdev->driver_name = DRIVER_NAME;
314         rdev->map_name = RC_MAP_STREAMZAP;
315 
316         ret = rc_register_device(rdev);
317         if (ret < 0) {
318                 dev_err(dev, "remote input device register failed\n");
319                 goto out;
320         }
321 
322         return rdev;
323 
324 out:
325         rc_free_device(rdev);
326         return NULL;
327 }
328 
329 /**
330  *      streamzap_probe
331  *
332  *      Called by usb-core to associated with a candidate device
333  *      On any failure the return value is the ERROR
334  *      On success return 0
335  */
336 static int streamzap_probe(struct usb_interface *intf,
337                            const struct usb_device_id *id)
338 {
339         struct usb_device *usbdev = interface_to_usbdev(intf);
340         struct usb_host_interface *iface_host;
341         struct streamzap_ir *sz = NULL;
342         char buf[63], name[128] = "";
343         int retval = -ENOMEM;
344         int pipe, maxp;
345 
346         /* Allocate space for device driver specific data */
347         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
348         if (!sz)
349                 return -ENOMEM;
350 
351         sz->usbdev = usbdev;
352         sz->interface = intf;
353 
354         /* Check to ensure endpoint information matches requirements */
355         iface_host = intf->cur_altsetting;
356 
357         if (iface_host->desc.bNumEndpoints != 1) {
358                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
359                         __func__, iface_host->desc.bNumEndpoints);
360                 retval = -ENODEV;
361                 goto free_sz;
362         }
363 
364         sz->endpoint = &(iface_host->endpoint[0].desc);
365         if (!usb_endpoint_dir_in(sz->endpoint)) {
366                 dev_err(&intf->dev, "%s: endpoint doesn't match input device "
367                         "02%02x\n", __func__, sz->endpoint->bEndpointAddress);
368                 retval = -ENODEV;
369                 goto free_sz;
370         }
371 
372         if (!usb_endpoint_xfer_int(sz->endpoint)) {
373                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer "
374                         "02%02x\n", __func__, sz->endpoint->bmAttributes);
375                 retval = -ENODEV;
376                 goto free_sz;
377         }
378 
379         pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
380         maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
381 
382         if (maxp == 0) {
383                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
384                         __func__);
385                 retval = -ENODEV;
386                 goto free_sz;
387         }
388 
389         /* Allocate the USB buffer and IRQ URB */
390         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
391         if (!sz->buf_in)
392                 goto free_sz;
393 
394         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
395         if (!sz->urb_in)
396                 goto free_buf_in;
397 
398         sz->dev = &intf->dev;
399         sz->buf_in_len = maxp;
400 
401         if (usbdev->descriptor.iManufacturer
402             && usb_string(usbdev, usbdev->descriptor.iManufacturer,
403                           buf, sizeof(buf)) > 0)
404                 strlcpy(name, buf, sizeof(name));
405 
406         if (usbdev->descriptor.iProduct
407             && usb_string(usbdev, usbdev->descriptor.iProduct,
408                           buf, sizeof(buf)) > 0)
409                 snprintf(name + strlen(name), sizeof(name) - strlen(name),
410                          " %s", buf);
411 
412         sz->rdev = streamzap_init_rc_dev(sz);
413         if (!sz->rdev)
414                 goto rc_dev_fail;
415 
416         sz->idle = true;
417         sz->decoder_state = PulseSpace;
418         /* FIXME: don't yet have a way to set this */
419         sz->timeout_enabled = true;
420         sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
421                                 IR_MAX_DURATION) | 0x03000000);
422         #if 0
423         /* not yet supported, depends on patches from maxim */
424         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
425         sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
426         sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
427         #endif
428 
429         do_gettimeofday(&sz->signal_start);
430 
431         /* Complete final initialisations */
432         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
433                          maxp, (usb_complete_t)streamzap_callback,
434                          sz, sz->endpoint->bInterval);
435         sz->urb_in->transfer_dma = sz->dma_in;
436         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
437 
438         usb_set_intfdata(intf, sz);
439 
440         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
441                 dev_err(sz->dev, "urb submit failed\n");
442 
443         dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
444                  usbdev->bus->busnum, usbdev->devnum);
445 
446         return 0;
447 
448 rc_dev_fail:
449         usb_free_urb(sz->urb_in);
450 free_buf_in:
451         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
452 free_sz:
453         kfree(sz);
454 
455         return retval;
456 }
457 
458 /**
459  * streamzap_disconnect
460  *
461  * Called by the usb core when the device is removed from the system.
462  *
463  * This routine guarantees that the driver will not submit any more urbs
464  * by clearing dev->usbdev.  It is also supposed to terminate any currently
465  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
466  * does not provide any way to do this.
467  */
468 static void streamzap_disconnect(struct usb_interface *interface)
469 {
470         struct streamzap_ir *sz = usb_get_intfdata(interface);
471         struct usb_device *usbdev = interface_to_usbdev(interface);
472 
473         usb_set_intfdata(interface, NULL);
474 
475         if (!sz)
476                 return;
477 
478         sz->usbdev = NULL;
479         rc_unregister_device(sz->rdev);
480         usb_kill_urb(sz->urb_in);
481         usb_free_urb(sz->urb_in);
482         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
483 
484         kfree(sz);
485 }
486 
487 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
488 {
489         struct streamzap_ir *sz = usb_get_intfdata(intf);
490 
491         usb_kill_urb(sz->urb_in);
492 
493         return 0;
494 }
495 
496 static int streamzap_resume(struct usb_interface *intf)
497 {
498         struct streamzap_ir *sz = usb_get_intfdata(intf);
499 
500         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
501                 dev_err(sz->dev, "Error sumbiting urb\n");
502                 return -EIO;
503         }
504 
505         return 0;
506 }
507 
508 module_usb_driver(streamzap_driver);
509 
510 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
511 MODULE_DESCRIPTION(DRIVER_DESC);
512 MODULE_LICENSE("GPL");
513 

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