drivers/media/usb/tm6000/tm6000-input.c

   1 /*
   2  *  tm6000-input.c - driver for TM5600/TM6000/TM6010 USB video capture devices
   3  *
   4  *  Copyright (C) 2010 Stefan Ringel <stefan.ringel@arcor.de>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation version 2
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19
  20 #include <linux/input.h>
  21 #include <linux/usb.h>
  22
  23 #include <media/rc-core.h>
  24
  25 #include "tm6000.h"
  26 #include "tm6000-regs.h"
  27
  28 static unsigned int ir_debug;
  29 module_param(ir_debug, int, 0644);
  30 MODULE_PARM_DESC(ir_debug, "debug message level");
  31
  32 static unsigned int enable_ir = 1;
  33 module_param(enable_ir, int, 0644);
  34 MODULE_PARM_DESC(enable_ir, "enable ir (default is enable)");
  35
  36 static unsigned int ir_clock_mhz = 12;
  37 module_param(ir_clock_mhz, int, 0644);
  38 MODULE_PARM_DESC(ir_clock_mhz, "ir clock, in MHz");
  39
  40 #define URB_SUBMIT_DELAY        100     /* ms - Delay to submit an URB request on retrial and init */
  41 #define URB_INT_LED_DELAY       100     /* ms - Delay to turn led on again on int mode */
  42
  43 #undef dprintk
  44
  45 #define dprintk(level, fmt, arg...) do {\
  46         if (ir_debug >= level) \
  47                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  48         } while (0)
  49
  50 struct tm6000_ir_poll_result {
  51         u16 rc_data;
  52 };
  53
  54 struct tm6000_IR {
  55         struct tm6000_core      *dev;
  56         struct rc_dev           *rc;
  57         char                    name[32];
  58         char                    phys[32];
  59
  60         /* poll expernal decoder */
  61         int                     polling;
  62         struct delayed_work     work;
  63         u8                      wait:1;
  64         u8                      pwled:2;
  65         u8                      submit_urb:1;
  66         struct urb              *int_urb;
  67
  68         /* IR device properties */
  69         u64                     rc_proto;
  70 };
  71
  72 void tm6000_ir_wait(struct tm6000_core *dev, u8 state)
  73 {
  74         struct tm6000_IR *ir = dev->ir;
  75
  76         if (!dev->ir)
  77                 return;
  78
  79         dprintk(2, "%s: %i\n",__func__, ir->wait);
  80
  81         if (state)
  82                 ir->wait = 1;
  83         else
  84                 ir->wait = 0;
  85 }
  86
  87 static int tm6000_ir_config(struct tm6000_IR *ir)
  88 {
  89         struct tm6000_core *dev = ir->dev;
  90         u32 pulse = 0, leader = 0;
  91
  92         dprintk(2, "%s\n",__func__);
  93
  94         /*
  95          * The IR decoder supports RC-5 or NEC, with a configurable timing.
  96          * The timing configuration there is not that accurate, as it uses
  97          * approximate values. The NEC spec mentions a 562.5 unit period,
  98          * and RC-5 uses a 888.8 period.
  99          * Currently, driver assumes a clock provided by a 12 MHz XTAL, but
 100          * a modprobe parameter can adjust it.
 101          * Adjustments are required for other timings.
 102          * It seems that the 900ms timing for NEC is used to detect a RC-5
 103          * IR, in order to discard such decoding
 104          */
 105
 106         switch (ir->rc_proto) {
 107         case RC_PROTO_BIT_NEC:
 108                 leader = 900;   /* ms */
 109                 pulse  = 700;   /* ms - the actual value would be 562 */
 110                 break;
 111         default:
 112         case RC_PROTO_BIT_RC5:
 113                 leader = 900;   /* ms - from the NEC decoding */
 114                 pulse  = 1780;  /* ms - The actual value would be 1776 */
 115                 break;
 116         }
 117
 118         pulse = ir_clock_mhz * pulse;
 119         leader = ir_clock_mhz * leader;
 120         if (ir->rc_proto == RC_PROTO_BIT_NEC)
 121                 leader = leader | 0x8000;
 122
 123         dprintk(2, "%s: %s, %d MHz, leader = 0x%04x, pulse = 0x%06x \n",
 124                 __func__,
 125                 (ir->rc_proto == RC_PROTO_BIT_NEC) ? "NEC" : "RC-5",
 126                 ir_clock_mhz, leader, pulse);
 127
 128         /* Remote WAKEUP = enable, normal mode, from IR decoder output */
 129         tm6000_set_reg(dev, TM6010_REQ07_RE5_REMOTE_WAKEUP, 0xfe);
 130
 131         /* Enable IR reception on non-busrt mode */
 132         tm6000_set_reg(dev, TM6010_REQ07_RD8_IR, 0x2f);
 133
 134         /* IR_WKUP_SEL = Low byte in decoded IR data */
 135         tm6000_set_reg(dev, TM6010_REQ07_RDA_IR_WAKEUP_SEL, 0xff);
 136         /* IR_WKU_ADD code */
 137         tm6000_set_reg(dev, TM6010_REQ07_RDB_IR_WAKEUP_ADD, 0xff);
 138
 139         tm6000_set_reg(dev, TM6010_REQ07_RDC_IR_LEADER1, leader >> 8);
 140         tm6000_set_reg(dev, TM6010_REQ07_RDD_IR_LEADER0, leader);
 141
 142         tm6000_set_reg(dev, TM6010_REQ07_RDE_IR_PULSE_CNT1, pulse >> 8);
 143         tm6000_set_reg(dev, TM6010_REQ07_RDF_IR_PULSE_CNT0, pulse);
 144
 145         if (!ir->polling)
 146                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
 147         else
 148                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 1);
 149         msleep(10);
 150
 151         /* Shows that IR is working via the LED */
 152         tm6000_flash_led(dev, 0);
 153         msleep(100);
 154         tm6000_flash_led(dev, 1);
 155         ir->pwled = 1;
 156
 157         return 0;
 158 }
 159
 160 static void tm6000_ir_keydown(struct tm6000_IR *ir,
 161                               const char *buf, unsigned int len)
 162 {
 163         u8 device, command;
 164         u32 scancode;
 165         enum rc_proto protocol;
 166
 167         if (len < 1)
 168                 return;
 169
 170         command = buf[0];
 171         device = (len > 1 ? buf[1] : 0x0);
 172         switch (ir->rc_proto) {
 173         case RC_PROTO_BIT_RC5:
 174                 protocol = RC_PROTO_RC5;
 175                 scancode = RC_SCANCODE_RC5(device, command);
 176                 break;
 177         case RC_PROTO_BIT_NEC:
 178                 protocol = RC_PROTO_NEC;
 179                 scancode = RC_SCANCODE_NEC(device, command);
 180                 break;
 181         default:
 182                 protocol = RC_PROTO_OTHER;
 183                 scancode = RC_SCANCODE_OTHER(device << 8 | command);
 184                 break;
 185         }
 186
 187         dprintk(1, "%s, protocol: 0x%04x, scancode: 0x%08x\n",
 188                 __func__, protocol, scancode);
 189         rc_keydown(ir->rc, protocol, scancode, 0);
 190 }
 191
 192 static void tm6000_ir_urb_received(struct urb *urb)
 193 {
 194         struct tm6000_core *dev = urb->context;
 195         struct tm6000_IR *ir = dev->ir;
 196         char *buf;
 197
 198         dprintk(2, "%s\n",__func__);
 199         if (urb->status < 0 || urb->actual_length <= 0) {
 200                 printk(KERN_INFO "tm6000: IR URB failure: status: %i, length %i\n",
 201                        urb->status, urb->actual_length);
 202                 ir->submit_urb = 1;
 203                 schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 204                 return;
 205         }
 206         buf = urb->transfer_buffer;
 207
 208         if (ir_debug)
 209                 print_hex_dump(KERN_DEBUG, "tm6000: IR data: ",
 210                                DUMP_PREFIX_OFFSET,16, 1,
 211                                buf, urb->actual_length, false);
 212
 213         tm6000_ir_keydown(ir, urb->transfer_buffer, urb->actual_length);
 214
 215         usb_submit_urb(urb, GFP_ATOMIC);
 216         /*
 217          * Flash the led. We can't do it here, as it is running on IRQ context.
 218          * So, use the scheduler to do it, in a few ms.
 219          */
 220         ir->pwled = 2;
 221         schedule_delayed_work(&ir->work, msecs_to_jiffies(10));
 222 }
 223
 224 static void tm6000_ir_handle_key(struct work_struct *work)
 225 {
 226         struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
 227         struct tm6000_core *dev = ir->dev;
 228         int rc;
 229         u8 buf[2];
 230
 231         if (ir->wait)
 232                 return;
 233
 234         dprintk(3, "%s\n",__func__);
 235
 236         rc = tm6000_read_write_usb(dev, USB_DIR_IN |
 237                 USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 238                 REQ_02_GET_IR_CODE, 0, 0, buf, 2);
 239         if (rc < 0)
 240                 return;
 241
 242         /* Check if something was read */
 243         if ((buf[0] & 0xff) == 0xff) {
 244                 if (!ir->pwled) {
 245                         tm6000_flash_led(dev, 1);
 246                         ir->pwled = 1;
 247                 }
 248                 return;
 249         }
 250
 251         tm6000_ir_keydown(ir, buf, rc);
 252         tm6000_flash_led(dev, 0);
 253         ir->pwled = 0;
 254
 255         /* Re-schedule polling */
 256         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 257 }
 258
 259 static void tm6000_ir_int_work(struct work_struct *work)
 260 {
 261         struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
 262         struct tm6000_core *dev = ir->dev;
 263         int rc;
 264
 265         dprintk(3, "%s, submit_urb = %d, pwled = %d\n",__func__, ir->submit_urb,
 266                 ir->pwled);
 267
 268         if (ir->submit_urb) {
 269                 dprintk(3, "Resubmit urb\n");
 270                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
 271
 272                 rc = usb_submit_urb(ir->int_urb, GFP_ATOMIC);
 273                 if (rc < 0) {
 274                         printk(KERN_ERR "tm6000: Can't submit an IR interrupt. Error %i\n",
 275                                rc);
 276                         /* Retry in 100 ms */
 277                         schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 278                         return;
 279                 }
 280                 ir->submit_urb = 0;
 281         }
 282
 283         /* Led is enabled only if USB submit doesn't fail */
 284         if (ir->pwled == 2) {
 285                 tm6000_flash_led(dev, 0);
 286                 ir->pwled = 0;
 287                 schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_INT_LED_DELAY));
 288         } else if (!ir->pwled) {
 289                 tm6000_flash_led(dev, 1);
 290                 ir->pwled = 1;
 291         }
 292 }
 293
 294 static int tm6000_ir_start(struct rc_dev *rc)
 295 {
 296         struct tm6000_IR *ir = rc->priv;
 297
 298         dprintk(2, "%s\n",__func__);
 299
 300         schedule_delayed_work(&ir->work, 0);
 301
 302         return 0;
 303 }
 304
 305 static void tm6000_ir_stop(struct rc_dev *rc)
 306 {
 307         struct tm6000_IR *ir = rc->priv;
 308
 309         dprintk(2, "%s\n",__func__);
 310
 311         cancel_delayed_work_sync(&ir->work);
 312 }
 313
 314 static int tm6000_ir_change_protocol(struct rc_dev *rc, u64 *rc_proto)
 315 {
 316         struct tm6000_IR *ir = rc->priv;
 317
 318         if (!ir)
 319                 return 0;
 320
 321         dprintk(2, "%s\n",__func__);
 322
 323         ir->rc_proto = *rc_proto;
 324
 325         tm6000_ir_config(ir);
 326         /* TODO */
 327         return 0;
 328 }
 329
 330 static int __tm6000_ir_int_start(struct rc_dev *rc)
 331 {
 332         struct tm6000_IR *ir = rc->priv;
 333         struct tm6000_core *dev;
 334         int pipe, size;
 335         int err = -ENOMEM;
 336
 337         if (!ir)
 338                 return -ENODEV;
 339         dev = ir->dev;
 340
 341         dprintk(2, "%s\n",__func__);
 342
 343         ir->int_urb = usb_alloc_urb(0, GFP_ATOMIC);
 344         if (!ir->int_urb)
 345                 return -ENOMEM;
 346
 347         pipe = usb_rcvintpipe(dev->udev,
 348                 dev->int_in.endp->desc.bEndpointAddress
 349                 & USB_ENDPOINT_NUMBER_MASK);
 350
 351         size = usb_maxpacket(dev->udev, pipe, usb_pipeout(pipe));
 352         dprintk(1, "IR max size: %d\n", size);
 353
 354         ir->int_urb->transfer_buffer = kzalloc(size, GFP_ATOMIC);
 355         if (!ir->int_urb->transfer_buffer) {
 356                 usb_free_urb(ir->int_urb);
 357                 return err;
 358         }
 359         dprintk(1, "int interval: %d\n", dev->int_in.endp->desc.bInterval);
 360
 361         usb_fill_int_urb(ir->int_urb, dev->udev, pipe,
 362                 ir->int_urb->transfer_buffer, size,
 363                 tm6000_ir_urb_received, dev,
 364                 dev->int_in.endp->desc.bInterval);
 365
 366         ir->submit_urb = 1;
 367         schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 368
 369         return 0;
 370 }
 371
 372 static void __tm6000_ir_int_stop(struct rc_dev *rc)
 373 {
 374         struct tm6000_IR *ir = rc->priv;
 375
 376         if (!ir || !ir->int_urb)
 377                 return;
 378
 379         dprintk(2, "%s\n",__func__);
 380
 381         usb_kill_urb(ir->int_urb);
 382         kfree(ir->int_urb->transfer_buffer);
 383         usb_free_urb(ir->int_urb);
 384         ir->int_urb = NULL;
 385 }
 386
 387 int tm6000_ir_int_start(struct tm6000_core *dev)
 388 {
 389         struct tm6000_IR *ir = dev->ir;
 390
 391         if (!ir)
 392                 return 0;
 393
 394         return __tm6000_ir_int_start(ir->rc);
 395 }
 396
 397 void tm6000_ir_int_stop(struct tm6000_core *dev)
 398 {
 399         struct tm6000_IR *ir = dev->ir;
 400
 401         if (!ir || !ir->rc)
 402                 return;
 403
 404         __tm6000_ir_int_stop(ir->rc);
 405 }
 406
 407 int tm6000_ir_init(struct tm6000_core *dev)
 408 {
 409         struct tm6000_IR *ir;
 410         struct rc_dev *rc;
 411         int err = -ENOMEM;
 412         u64 rc_proto;
 413
 414         if (!enable_ir)
 415                 return -ENODEV;
 416
 417         if (!dev->caps.has_remote)
 418                 return 0;
 419
 420         if (!dev->ir_codes)
 421                 return 0;
 422
 423         ir = kzalloc(sizeof(*ir), GFP_ATOMIC);
 424         rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 425         if (!ir || !rc)
 426                 goto out;
 427
 428         dprintk(2, "%s\n", __func__);
 429
 430         /* record handles to ourself */
 431         ir->dev = dev;
 432         dev->ir = ir;
 433         ir->rc = rc;
 434
 435         /* input setup */
 436         rc->allowed_protocols = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_NEC;
 437         /* Needed, in order to support NEC remotes with 24 or 32 bits */
 438         rc->scancode_mask = 0xffff;
 439         rc->priv = ir;
 440         rc->change_protocol = tm6000_ir_change_protocol;
 441         if (dev->int_in.endp) {
 442                 rc->open    = __tm6000_ir_int_start;
 443                 rc->close   = __tm6000_ir_int_stop;
 444                 INIT_DELAYED_WORK(&ir->work, tm6000_ir_int_work);
 445         } else {
 446                 rc->open  = tm6000_ir_start;
 447                 rc->close = tm6000_ir_stop;
 448                 ir->polling = 50;
 449                 INIT_DELAYED_WORK(&ir->work, tm6000_ir_handle_key);
 450         }
 451
 452         snprintf(ir->name, sizeof(ir->name), "tm5600/60x0 IR (%s)",
 453                                                 dev->name);
 454
 455         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 456         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 457
 458         rc_proto = RC_PROTO_BIT_UNKNOWN;
 459         tm6000_ir_change_protocol(rc, &rc_proto);
 460
 461         rc->device_name = ir->name;
 462         rc->input_phys = ir->phys;
 463         rc->input_id.bustype = BUS_USB;
 464         rc->input_id.version = 1;
 465         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 466         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 467         rc->map_name = dev->ir_codes;
 468         rc->driver_name = "tm6000";
 469         rc->dev.parent = &dev->udev->dev;
 470
 471         /* ir register */
 472         err = rc_register_device(rc);
 473         if (err)
 474                 goto out;
 475
 476         return 0;
 477
 478 out:
 479         dev->ir = NULL;
 480         rc_free_device(rc);
 481         kfree(ir);
 482         return err;
 483 }
 484
 485 int tm6000_ir_fini(struct tm6000_core *dev)
 486 {
 487         struct tm6000_IR *ir = dev->ir;
 488
 489         /* skip detach on non attached board */
 490
 491         if (!ir)
 492                 return 0;
 493
 494         dprintk(2, "%s\n",__func__);
 495
 496         if (!ir->polling)
 497                 __tm6000_ir_int_stop(ir->rc);
 498
 499         tm6000_ir_stop(ir->rc);
 500
 501         /* Turn off the led */
 502         tm6000_flash_led(dev, 0);
 503         ir->pwled = 0;
 504
 505         rc_unregister_device(ir->rc);
 506
 507         kfree(ir);
 508         dev->ir = NULL;
 509
 510         return 0;
 511 }