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

DEFINITIONS

1. tm6000_ir_wait
2. tm6000_ir_config
3. tm6000_ir_keydown
4. tm6000_ir_urb_received
5. tm6000_ir_handle_key
6. tm6000_ir_int_work
7. tm6000_ir_start
8. tm6000_ir_stop
9. tm6000_ir_change_protocol
10. __tm6000_ir_int_start
11. __tm6000_ir_int_stop
12. tm6000_ir_int_start
13. tm6000_ir_int_stop
14. tm6000_ir_init
15. tm6000_ir_fini

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  tm6000-input.c - driver for TM5600/TM6000/TM6010 USB video capture devices
   4  *
   5  *  Copyright (C) 2010 Stefan Ringel <stefan.ringel@arcor.de>
   6  */
   7 
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/delay.h>
  11 
  12 #include <linux/input.h>
  13 #include <linux/usb.h>
  14 
  15 #include <media/rc-core.h>
  16 
  17 #include "tm6000.h"
  18 #include "tm6000-regs.h"
  19 
  20 static unsigned int ir_debug;
  21 module_param(ir_debug, int, 0644);
  22 MODULE_PARM_DESC(ir_debug, "debug message level");
  23 
  24 static unsigned int enable_ir = 1;
  25 module_param(enable_ir, int, 0644);
  26 MODULE_PARM_DESC(enable_ir, "enable ir (default is enable)");
  27 
  28 static unsigned int ir_clock_mhz = 12;
  29 module_param(ir_clock_mhz, int, 0644);
  30 MODULE_PARM_DESC(ir_clock_mhz, "ir clock, in MHz");
  31 
  32 #define URB_SUBMIT_DELAY        100     /* ms - Delay to submit an URB request on retrial and init */
  33 #define URB_INT_LED_DELAY       100     /* ms - Delay to turn led on again on int mode */
  34 
  35 #undef dprintk
  36 
  37 #define dprintk(level, fmt, arg...) do {\
  38         if (ir_debug >= level) \
  39                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  40         } while (0)
  41 
  42 struct tm6000_ir_poll_result {
  43         u16 rc_data;
  44 };
  45 
  46 struct tm6000_IR {
  47         struct tm6000_core      *dev;
  48         struct rc_dev           *rc;
  49         char                    name[32];
  50         char                    phys[32];
  51 
  52         /* poll expernal decoder */
  53         int                     polling;
  54         struct delayed_work     work;
  55         u8                      wait:1;
  56         u8                      pwled:2;
  57         u8                      submit_urb:1;
  58         struct urb              *int_urb;
  59 
  60         /* IR device properties */
  61         u64                     rc_proto;
  62 };
  63 
  64 void tm6000_ir_wait(struct tm6000_core *dev, u8 state)
  65 {
  66         struct tm6000_IR *ir = dev->ir;
  67 
  68         if (!dev->ir)
  69                 return;
  70 
  71         dprintk(2, "%s: %i\n",__func__, ir->wait);
  72 
  73         if (state)
  74                 ir->wait = 1;
  75         else
  76                 ir->wait = 0;
  77 }
  78 
  79 static int tm6000_ir_config(struct tm6000_IR *ir)
  80 {
  81         struct tm6000_core *dev = ir->dev;
  82         u32 pulse = 0, leader = 0;
  83 
  84         dprintk(2, "%s\n",__func__);
  85 
  86         /*
  87          * The IR decoder supports RC-5 or NEC, with a configurable timing.
  88          * The timing configuration there is not that accurate, as it uses
  89          * approximate values. The NEC spec mentions a 562.5 unit period,
  90          * and RC-5 uses a 888.8 period.
  91          * Currently, driver assumes a clock provided by a 12 MHz XTAL, but
  92          * a modprobe parameter can adjust it.
  93          * Adjustments are required for other timings.
  94          * It seems that the 900ms timing for NEC is used to detect a RC-5
  95          * IR, in order to discard such decoding
  96          */
  97 
  98         switch (ir->rc_proto) {
  99         case RC_PROTO_BIT_NEC:
 100                 leader = 900;   /* ms */
 101                 pulse  = 700;   /* ms - the actual value would be 562 */
 102                 break;
 103         default:
 104         case RC_PROTO_BIT_RC5:
 105                 leader = 900;   /* ms - from the NEC decoding */
 106                 pulse  = 1780;  /* ms - The actual value would be 1776 */
 107                 break;
 108         }
 109 
 110         pulse = ir_clock_mhz * pulse;
 111         leader = ir_clock_mhz * leader;
 112         if (ir->rc_proto == RC_PROTO_BIT_NEC)
 113                 leader = leader | 0x8000;
 114 
 115         dprintk(2, "%s: %s, %d MHz, leader = 0x%04x, pulse = 0x%06x \n",
 116                 __func__,
 117                 (ir->rc_proto == RC_PROTO_BIT_NEC) ? "NEC" : "RC-5",
 118                 ir_clock_mhz, leader, pulse);
 119 
 120         /* Remote WAKEUP = enable, normal mode, from IR decoder output */
 121         tm6000_set_reg(dev, TM6010_REQ07_RE5_REMOTE_WAKEUP, 0xfe);
 122 
 123         /* Enable IR reception on non-busrt mode */
 124         tm6000_set_reg(dev, TM6010_REQ07_RD8_IR, 0x2f);
 125 
 126         /* IR_WKUP_SEL = Low byte in decoded IR data */
 127         tm6000_set_reg(dev, TM6010_REQ07_RDA_IR_WAKEUP_SEL, 0xff);
 128         /* IR_WKU_ADD code */
 129         tm6000_set_reg(dev, TM6010_REQ07_RDB_IR_WAKEUP_ADD, 0xff);
 130 
 131         tm6000_set_reg(dev, TM6010_REQ07_RDC_IR_LEADER1, leader >> 8);
 132         tm6000_set_reg(dev, TM6010_REQ07_RDD_IR_LEADER0, leader);
 133 
 134         tm6000_set_reg(dev, TM6010_REQ07_RDE_IR_PULSE_CNT1, pulse >> 8);
 135         tm6000_set_reg(dev, TM6010_REQ07_RDF_IR_PULSE_CNT0, pulse);
 136 
 137         if (!ir->polling)
 138                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
 139         else
 140                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 1);
 141         msleep(10);
 142 
 143         /* Shows that IR is working via the LED */
 144         tm6000_flash_led(dev, 0);
 145         msleep(100);
 146         tm6000_flash_led(dev, 1);
 147         ir->pwled = 1;
 148 
 149         return 0;
 150 }
 151 
 152 static void tm6000_ir_keydown(struct tm6000_IR *ir,
 153                               const char *buf, unsigned int len)
 154 {
 155         u8 device, command;
 156         u32 scancode;
 157         enum rc_proto protocol;
 158 
 159         if (len < 1)
 160                 return;
 161 
 162         command = buf[0];
 163         device = (len > 1 ? buf[1] : 0x0);
 164         switch (ir->rc_proto) {
 165         case RC_PROTO_BIT_RC5:
 166                 protocol = RC_PROTO_RC5;
 167                 scancode = RC_SCANCODE_RC5(device, command);
 168                 break;
 169         case RC_PROTO_BIT_NEC:
 170                 protocol = RC_PROTO_NEC;
 171                 scancode = RC_SCANCODE_NEC(device, command);
 172                 break;
 173         default:
 174                 protocol = RC_PROTO_OTHER;
 175                 scancode = RC_SCANCODE_OTHER(device << 8 | command);
 176                 break;
 177         }
 178 
 179         dprintk(1, "%s, protocol: 0x%04x, scancode: 0x%08x\n",
 180                 __func__, protocol, scancode);
 181         rc_keydown(ir->rc, protocol, scancode, 0);
 182 }
 183 
 184 static void tm6000_ir_urb_received(struct urb *urb)
 185 {
 186         struct tm6000_core *dev = urb->context;
 187         struct tm6000_IR *ir = dev->ir;
 188         char *buf;
 189 
 190         dprintk(2, "%s\n",__func__);
 191         if (urb->status < 0 || urb->actual_length <= 0) {
 192                 printk(KERN_INFO "tm6000: IR URB failure: status: %i, length %i\n",
 193                        urb->status, urb->actual_length);
 194                 ir->submit_urb = 1;
 195                 schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 196                 return;
 197         }
 198         buf = urb->transfer_buffer;
 199 
 200         if (ir_debug)
 201                 print_hex_dump(KERN_DEBUG, "tm6000: IR data: ",
 202                                DUMP_PREFIX_OFFSET,16, 1,
 203                                buf, urb->actual_length, false);
 204 
 205         tm6000_ir_keydown(ir, urb->transfer_buffer, urb->actual_length);
 206 
 207         usb_submit_urb(urb, GFP_ATOMIC);
 208         /*
 209          * Flash the led. We can't do it here, as it is running on IRQ context.
 210          * So, use the scheduler to do it, in a few ms.
 211          */
 212         ir->pwled = 2;
 213         schedule_delayed_work(&ir->work, msecs_to_jiffies(10));
 214 }
 215 
 216 static void tm6000_ir_handle_key(struct work_struct *work)
 217 {
 218         struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
 219         struct tm6000_core *dev = ir->dev;
 220         int rc;
 221         u8 buf[2];
 222 
 223         if (ir->wait)
 224                 return;
 225 
 226         dprintk(3, "%s\n",__func__);
 227 
 228         rc = tm6000_read_write_usb(dev, USB_DIR_IN |
 229                 USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 230                 REQ_02_GET_IR_CODE, 0, 0, buf, 2);
 231         if (rc < 0)
 232                 return;
 233 
 234         /* Check if something was read */
 235         if ((buf[0] & 0xff) == 0xff) {
 236                 if (!ir->pwled) {
 237                         tm6000_flash_led(dev, 1);
 238                         ir->pwled = 1;
 239                 }
 240                 return;
 241         }
 242 
 243         tm6000_ir_keydown(ir, buf, rc);
 244         tm6000_flash_led(dev, 0);
 245         ir->pwled = 0;
 246 
 247         /* Re-schedule polling */
 248         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 249 }
 250 
 251 static void tm6000_ir_int_work(struct work_struct *work)
 252 {
 253         struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
 254         struct tm6000_core *dev = ir->dev;
 255         int rc;
 256 
 257         dprintk(3, "%s, submit_urb = %d, pwled = %d\n",__func__, ir->submit_urb,
 258                 ir->pwled);
 259 
 260         if (ir->submit_urb) {
 261                 dprintk(3, "Resubmit urb\n");
 262                 tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
 263 
 264                 rc = usb_submit_urb(ir->int_urb, GFP_ATOMIC);
 265                 if (rc < 0) {
 266                         printk(KERN_ERR "tm6000: Can't submit an IR interrupt. Error %i\n",
 267                                rc);
 268                         /* Retry in 100 ms */
 269                         schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 270                         return;
 271                 }
 272                 ir->submit_urb = 0;
 273         }
 274 
 275         /* Led is enabled only if USB submit doesn't fail */
 276         if (ir->pwled == 2) {
 277                 tm6000_flash_led(dev, 0);
 278                 ir->pwled = 0;
 279                 schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_INT_LED_DELAY));
 280         } else if (!ir->pwled) {
 281                 tm6000_flash_led(dev, 1);
 282                 ir->pwled = 1;
 283         }
 284 }
 285 
 286 static int tm6000_ir_start(struct rc_dev *rc)
 287 {
 288         struct tm6000_IR *ir = rc->priv;
 289 
 290         dprintk(2, "%s\n",__func__);
 291 
 292         schedule_delayed_work(&ir->work, 0);
 293 
 294         return 0;
 295 }
 296 
 297 static void tm6000_ir_stop(struct rc_dev *rc)
 298 {
 299         struct tm6000_IR *ir = rc->priv;
 300 
 301         dprintk(2, "%s\n",__func__);
 302 
 303         cancel_delayed_work_sync(&ir->work);
 304 }
 305 
 306 static int tm6000_ir_change_protocol(struct rc_dev *rc, u64 *rc_proto)
 307 {
 308         struct tm6000_IR *ir = rc->priv;
 309 
 310         if (!ir)
 311                 return 0;
 312 
 313         dprintk(2, "%s\n",__func__);
 314 
 315         ir->rc_proto = *rc_proto;
 316 
 317         tm6000_ir_config(ir);
 318         /* TODO */
 319         return 0;
 320 }
 321 
 322 static int __tm6000_ir_int_start(struct rc_dev *rc)
 323 {
 324         struct tm6000_IR *ir = rc->priv;
 325         struct tm6000_core *dev;
 326         int pipe, size;
 327         int err = -ENOMEM;
 328 
 329         if (!ir)
 330                 return -ENODEV;
 331         dev = ir->dev;
 332 
 333         dprintk(2, "%s\n",__func__);
 334 
 335         ir->int_urb = usb_alloc_urb(0, GFP_ATOMIC);
 336         if (!ir->int_urb)
 337                 return -ENOMEM;
 338 
 339         pipe = usb_rcvintpipe(dev->udev,
 340                 dev->int_in.endp->desc.bEndpointAddress
 341                 & USB_ENDPOINT_NUMBER_MASK);
 342 
 343         size = usb_maxpacket(dev->udev, pipe, usb_pipeout(pipe));
 344         dprintk(1, "IR max size: %d\n", size);
 345 
 346         ir->int_urb->transfer_buffer = kzalloc(size, GFP_ATOMIC);
 347         if (!ir->int_urb->transfer_buffer) {
 348                 usb_free_urb(ir->int_urb);
 349                 return err;
 350         }
 351         dprintk(1, "int interval: %d\n", dev->int_in.endp->desc.bInterval);
 352 
 353         usb_fill_int_urb(ir->int_urb, dev->udev, pipe,
 354                 ir->int_urb->transfer_buffer, size,
 355                 tm6000_ir_urb_received, dev,
 356                 dev->int_in.endp->desc.bInterval);
 357 
 358         ir->submit_urb = 1;
 359         schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
 360 
 361         return 0;
 362 }
 363 
 364 static void __tm6000_ir_int_stop(struct rc_dev *rc)
 365 {
 366         struct tm6000_IR *ir = rc->priv;
 367 
 368         if (!ir || !ir->int_urb)
 369                 return;
 370 
 371         dprintk(2, "%s\n",__func__);
 372 
 373         usb_kill_urb(ir->int_urb);
 374         kfree(ir->int_urb->transfer_buffer);
 375         usb_free_urb(ir->int_urb);
 376         ir->int_urb = NULL;
 377 }
 378 
 379 int tm6000_ir_int_start(struct tm6000_core *dev)
 380 {
 381         struct tm6000_IR *ir = dev->ir;
 382 
 383         if (!ir)
 384                 return 0;
 385 
 386         return __tm6000_ir_int_start(ir->rc);
 387 }
 388 
 389 void tm6000_ir_int_stop(struct tm6000_core *dev)
 390 {
 391         struct tm6000_IR *ir = dev->ir;
 392 
 393         if (!ir || !ir->rc)
 394                 return;
 395 
 396         __tm6000_ir_int_stop(ir->rc);
 397 }
 398 
 399 int tm6000_ir_init(struct tm6000_core *dev)
 400 {
 401         struct tm6000_IR *ir;
 402         struct rc_dev *rc;
 403         int err = -ENOMEM;
 404         u64 rc_proto;
 405 
 406         if (!enable_ir)
 407                 return -ENODEV;
 408 
 409         if (!dev->caps.has_remote)
 410                 return 0;
 411 
 412         if (!dev->ir_codes)
 413                 return 0;
 414 
 415         ir = kzalloc(sizeof(*ir), GFP_ATOMIC);
 416         rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 417         if (!ir || !rc)
 418                 goto out;
 419 
 420         dprintk(2, "%s\n", __func__);
 421 
 422         /* record handles to ourself */
 423         ir->dev = dev;
 424         dev->ir = ir;
 425         ir->rc = rc;
 426 
 427         /* input setup */
 428         rc->allowed_protocols = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_NEC;
 429         /* Needed, in order to support NEC remotes with 24 or 32 bits */
 430         rc->scancode_mask = 0xffff;
 431         rc->priv = ir;
 432         rc->change_protocol = tm6000_ir_change_protocol;
 433         if (dev->int_in.endp) {
 434                 rc->open    = __tm6000_ir_int_start;
 435                 rc->close   = __tm6000_ir_int_stop;
 436                 INIT_DELAYED_WORK(&ir->work, tm6000_ir_int_work);
 437         } else {
 438                 rc->open  = tm6000_ir_start;
 439                 rc->close = tm6000_ir_stop;
 440                 ir->polling = 50;
 441                 INIT_DELAYED_WORK(&ir->work, tm6000_ir_handle_key);
 442         }
 443 
 444         snprintf(ir->name, sizeof(ir->name), "tm5600/60x0 IR (%s)",
 445                                                 dev->name);
 446 
 447         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 448         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 449 
 450         rc_proto = RC_PROTO_BIT_UNKNOWN;
 451         tm6000_ir_change_protocol(rc, &rc_proto);
 452 
 453         rc->device_name = ir->name;
 454         rc->input_phys = ir->phys;
 455         rc->input_id.bustype = BUS_USB;
 456         rc->input_id.version = 1;
 457         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 458         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 459         rc->map_name = dev->ir_codes;
 460         rc->driver_name = "tm6000";
 461         rc->dev.parent = &dev->udev->dev;
 462 
 463         /* ir register */
 464         err = rc_register_device(rc);
 465         if (err)
 466                 goto out;
 467 
 468         return 0;
 469 
 470 out:
 471         dev->ir = NULL;
 472         rc_free_device(rc);
 473         kfree(ir);
 474         return err;
 475 }
 476 
 477 int tm6000_ir_fini(struct tm6000_core *dev)
 478 {
 479         struct tm6000_IR *ir = dev->ir;
 480 
 481         /* skip detach on non attached board */
 482 
 483         if (!ir)
 484                 return 0;
 485 
 486         dprintk(2, "%s\n",__func__);
 487 
 488         if (!ir->polling)
 489                 __tm6000_ir_int_stop(ir->rc);
 490 
 491         tm6000_ir_stop(ir->rc);
 492 
 493         /* Turn off the led */
 494         tm6000_flash_led(dev, 0);
 495         ir->pwled = 0;
 496 
 497         rc_unregister_device(ir->rc);
 498 
 499         kfree(ir);
 500         dev->ir = NULL;
 501 
 502         return 0;
 503 }