1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * USB RedRat3 IR Transceiver rc-core driver 4 * 5 * Copyright (c) 2011 by Jarod Wilson <jarod@redhat.com> 6 * based heavily on the work of Stephen Cox, with additional 7 * help from RedRat Ltd. 8 * 9 * This driver began life based on an old version of the first-generation 10 * lirc_mceusb driver from the lirc 0.7.2 distribution. It was then 11 * significantly rewritten by Stephen Cox with the aid of RedRat Ltd's 12 * Chris Dodge. 13 * 14 * The driver was then ported to rc-core and significantly rewritten again, 15 * by Jarod, using the in-kernel mceusb driver as a guide, after an initial 16 * port effort was started by Stephen. 17 * 18 * TODO LIST: 19 * - fix lirc not showing repeats properly 20 * -- 21 * 22 * The RedRat3 is a USB transceiver with both send & receive, 23 * with 2 separate sensors available for receive to enable 24 * both good long range reception for general use, and good 25 * short range reception when required for learning a signal. 26 * 27 * http://www.redrat.co.uk/ 28 * 29 * It uses its own little protocol to communicate, the required 30 * parts of which are embedded within this driver. 31 * -- 32 */ 33 34 #include <asm/unaligned.h> 35 #include <linux/device.h> 36 #include <linux/leds.h> 37 #include <linux/module.h> 38 #include <linux/slab.h> 39 #include <linux/usb.h> 40 #include <linux/usb/input.h> 41 #include <media/rc-core.h> 42 43 /* Driver Information */ 44 #define DRIVER_AUTHOR "Jarod Wilson <jarod@redhat.com>" 45 #define DRIVER_AUTHOR2 "The Dweller, Stephen Cox" 46 #define DRIVER_DESC "RedRat3 USB IR Transceiver Driver" 47 #define DRIVER_NAME "redrat3" 48 49 /* bulk data transfer types */ 50 #define RR3_ERROR 0x01 51 #define RR3_MOD_SIGNAL_IN 0x20 52 #define RR3_MOD_SIGNAL_OUT 0x21 53 54 /* Get the RR firmware version */ 55 #define RR3_FW_VERSION 0xb1 56 #define RR3_FW_VERSION_LEN 64 57 /* Send encoded signal bulk-sent earlier*/ 58 #define RR3_TX_SEND_SIGNAL 0xb3 59 #define RR3_SET_IR_PARAM 0xb7 60 #define RR3_GET_IR_PARAM 0xb8 61 /* Blink the red LED on the device */ 62 #define RR3_BLINK_LED 0xb9 63 /* Read serial number of device */ 64 #define RR3_READ_SER_NO 0xba 65 #define RR3_SER_NO_LEN 4 66 /* Start capture with the RC receiver */ 67 #define RR3_RC_DET_ENABLE 0xbb 68 /* Stop capture with the RC receiver */ 69 #define RR3_RC_DET_DISABLE 0xbc 70 /* Start capture with the wideband receiver */ 71 #define RR3_MODSIG_CAPTURE 0xb2 72 /* Return the status of RC detector capture */ 73 #define RR3_RC_DET_STATUS 0xbd 74 /* Reset redrat */ 75 #define RR3_RESET 0xa0 76 77 /* Max number of lengths in the signal. */ 78 #define RR3_IR_IO_MAX_LENGTHS 0x01 79 /* Periods to measure mod. freq. */ 80 #define RR3_IR_IO_PERIODS_MF 0x02 81 /* Size of memory for main signal data */ 82 #define RR3_IR_IO_SIG_MEM_SIZE 0x03 83 /* Delta value when measuring lengths */ 84 #define RR3_IR_IO_LENGTH_FUZZ 0x04 85 /* Timeout for end of signal detection */ 86 #define RR3_IR_IO_SIG_TIMEOUT 0x05 87 /* Minimum value for pause recognition. */ 88 #define RR3_IR_IO_MIN_PAUSE 0x06 89 90 /* Clock freq. of EZ-USB chip */ 91 #define RR3_CLK 24000000 92 /* Clock periods per timer count */ 93 #define RR3_CLK_PER_COUNT 12 94 /* (RR3_CLK / RR3_CLK_PER_COUNT) */ 95 #define RR3_CLK_CONV_FACTOR 2000000 96 /* USB bulk-in wideband IR data endpoint address */ 97 #define RR3_WIDE_IN_EP_ADDR 0x81 98 /* USB bulk-in narrowband IR data endpoint address */ 99 #define RR3_NARROW_IN_EP_ADDR 0x82 100 101 /* Size of the fixed-length portion of the signal */ 102 #define RR3_DRIVER_MAXLENS 255 103 #define RR3_MAX_SIG_SIZE 512 104 #define RR3_TIME_UNIT 50 105 #define RR3_END_OF_SIGNAL 0x7f 106 #define RR3_TX_TRAILER_LEN 2 107 #define RR3_RX_MIN_TIMEOUT 5 108 #define RR3_RX_MAX_TIMEOUT 2000 109 110 /* The 8051's CPUCS Register address */ 111 #define RR3_CPUCS_REG_ADDR 0x7f92 112 113 #define USB_RR3USB_VENDOR_ID 0x112a 114 #define USB_RR3USB_PRODUCT_ID 0x0001 115 #define USB_RR3IIUSB_PRODUCT_ID 0x0005 116 117 118 /* 119 * The redrat3 encodes an IR signal as set of different lengths and a set 120 * of indices into those lengths. This sets how much two lengths must 121 * differ before they are considered distinct, the value is specified 122 * in microseconds. 123 * Default 5, value 0 to 127. 124 */ 125 static int length_fuzz = 5; 126 module_param(length_fuzz, uint, 0644); 127 MODULE_PARM_DESC(length_fuzz, "Length Fuzz (0-127)"); 128 129 /* 130 * When receiving a continuous ir stream (for example when a user is 131 * holding a button down on a remote), this specifies the minimum size 132 * of a space when the redrat3 sends a irdata packet to the host. Specified 133 * in milliseconds. Default value 18ms. 134 * The value can be between 2 and 30 inclusive. 135 */ 136 static int minimum_pause = 18; 137 module_param(minimum_pause, uint, 0644); 138 MODULE_PARM_DESC(minimum_pause, "Minimum Pause in ms (2-30)"); 139 140 /* 141 * The carrier frequency is measured during the first pulse of the IR 142 * signal. The larger the number of periods used To measure, the more 143 * accurate the result is likely to be, however some signals have short 144 * initial pulses, so in some case it may be necessary to reduce this value. 145 * Default 8, value 1 to 255. 146 */ 147 static int periods_measure_carrier = 8; 148 module_param(periods_measure_carrier, uint, 0644); 149 MODULE_PARM_DESC(periods_measure_carrier, "Number of Periods to Measure Carrier (1-255)"); 150 151 152 struct redrat3_header { 153 __be16 length; 154 __be16 transfer_type; 155 } __packed; 156 157 /* sending and receiving irdata */ 158 struct redrat3_irdata { 159 struct redrat3_header header; 160 __be32 pause; 161 __be16 mod_freq_count; 162 __be16 num_periods; 163 __u8 max_lengths; 164 __u8 no_lengths; 165 __be16 max_sig_size; 166 __be16 sig_size; 167 __u8 no_repeats; 168 __be16 lens[RR3_DRIVER_MAXLENS]; /* not aligned */ 169 __u8 sigdata[RR3_MAX_SIG_SIZE]; 170 } __packed; 171 172 /* firmware errors */ 173 struct redrat3_error { 174 struct redrat3_header header; 175 __be16 fw_error; 176 } __packed; 177 178 /* table of devices that work with this driver */ 179 static const struct usb_device_id redrat3_dev_table[] = { 180 /* Original version of the RedRat3 */ 181 {USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3USB_PRODUCT_ID)}, 182 /* Second Version/release of the RedRat3 - RetRat3-II */ 183 {USB_DEVICE(USB_RR3USB_VENDOR_ID, USB_RR3IIUSB_PRODUCT_ID)}, 184 {} /* Terminating entry */ 185 }; 186 187 /* Structure to hold all of our device specific stuff */ 188 struct redrat3_dev { 189 /* core device bits */ 190 struct rc_dev *rc; 191 struct device *dev; 192 193 /* led control */ 194 struct led_classdev led; 195 atomic_t flash; 196 struct usb_ctrlrequest flash_control; 197 struct urb *flash_urb; 198 u8 flash_in_buf; 199 200 /* learning */ 201 bool wideband; 202 struct usb_ctrlrequest learn_control; 203 struct urb *learn_urb; 204 u8 learn_buf; 205 206 /* save off the usb device pointer */ 207 struct usb_device *udev; 208 209 /* the receive endpoint */ 210 struct usb_endpoint_descriptor *ep_narrow; 211 /* the buffer to receive data */ 212 void *bulk_in_buf; 213 /* urb used to read ir data */ 214 struct urb *narrow_urb; 215 struct urb *wide_urb; 216 217 /* the send endpoint */ 218 struct usb_endpoint_descriptor *ep_out; 219 220 /* usb dma */ 221 dma_addr_t dma_in; 222 223 /* Is the device currently transmitting?*/ 224 bool transmitting; 225 226 /* store for current packet */ 227 struct redrat3_irdata irdata; 228 u16 bytes_read; 229 230 u32 carrier; 231 232 char name[64]; 233 char phys[64]; 234 }; 235 236 static void redrat3_dump_fw_error(struct redrat3_dev *rr3, int code) 237 { 238 if (!rr3->transmitting && (code != 0x40)) 239 dev_info(rr3->dev, "fw error code 0x%02x: ", code); 240 241 switch (code) { 242 case 0x00: 243 pr_cont("No Error\n"); 244 break; 245 246 /* Codes 0x20 through 0x2f are IR Firmware Errors */ 247 case 0x20: 248 pr_cont("Initial signal pulse not long enough to measure carrier frequency\n"); 249 break; 250 case 0x21: 251 pr_cont("Not enough length values allocated for signal\n"); 252 break; 253 case 0x22: 254 pr_cont("Not enough memory allocated for signal data\n"); 255 break; 256 case 0x23: 257 pr_cont("Too many signal repeats\n"); 258 break; 259 case 0x28: 260 pr_cont("Insufficient memory available for IR signal data memory allocation\n"); 261 break; 262 case 0x29: 263 pr_cont("Insufficient memory available for IrDa signal data memory allocation\n"); 264 break; 265 266 /* Codes 0x30 through 0x3f are USB Firmware Errors */ 267 case 0x30: 268 pr_cont("Insufficient memory available for bulk transfer structure\n"); 269 break; 270 271 /* 272 * Other error codes... These are primarily errors that can occur in 273 * the control messages sent to the redrat 274 */ 275 case 0x40: 276 if (!rr3->transmitting) 277 pr_cont("Signal capture has been terminated\n"); 278 break; 279 case 0x41: 280 pr_cont("Attempt to set/get and unknown signal I/O algorithm parameter\n"); 281 break; 282 case 0x42: 283 pr_cont("Signal capture already started\n"); 284 break; 285 286 default: 287 pr_cont("Unknown Error\n"); 288 break; 289 } 290 } 291 292 static u32 redrat3_val_to_mod_freq(struct redrat3_irdata *irdata) 293 { 294 u32 mod_freq = 0; 295 u16 mod_freq_count = be16_to_cpu(irdata->mod_freq_count); 296 297 if (mod_freq_count != 0) 298 mod_freq = (RR3_CLK * be16_to_cpu(irdata->num_periods)) / 299 (mod_freq_count * RR3_CLK_PER_COUNT); 300 301 return mod_freq; 302 } 303 304 /* this function scales down the figures for the same result... */ 305 static u32 redrat3_len_to_us(u32 length) 306 { 307 u32 biglen = length * 1000; 308 u32 divisor = (RR3_CLK_CONV_FACTOR) / 1000; 309 u32 result = (u32) (biglen / divisor); 310 311 /* don't allow zero lengths to go back, breaks lirc */ 312 return result ? result : 1; 313 } 314 315 /* 316 * convert us back into redrat3 lengths 317 * 318 * length * 1000 length * 1000000 319 * ------------- = ---------------- = micro 320 * rr3clk / 1000 rr3clk 321 322 * 6 * 2 4 * 3 micro * rr3clk micro * rr3clk / 1000 323 * ----- = 4 ----- = 6 -------------- = len --------------------- 324 * 3 2 1000000 1000 325 */ 326 static u32 redrat3_us_to_len(u32 microsec) 327 { 328 u32 result; 329 u32 divisor; 330 331 microsec = (microsec > IR_MAX_DURATION) ? IR_MAX_DURATION : microsec; 332 divisor = (RR3_CLK_CONV_FACTOR / 1000); 333 result = (u32)(microsec * divisor) / 1000; 334 335 /* don't allow zero lengths to go back, breaks lirc */ 336 return result ? result : 1; 337 } 338 339 static void redrat3_process_ir_data(struct redrat3_dev *rr3) 340 { 341 struct ir_raw_event rawir = {}; 342 struct device *dev; 343 unsigned int i, sig_size, offset, val; 344 u32 mod_freq; 345 346 dev = rr3->dev; 347 348 mod_freq = redrat3_val_to_mod_freq(&rr3->irdata); 349 dev_dbg(dev, "Got mod_freq of %u\n", mod_freq); 350 if (mod_freq && rr3->wideband) { 351 struct ir_raw_event ev = { 352 .carrier_report = 1, 353 .carrier = mod_freq 354 }; 355 356 ir_raw_event_store(rr3->rc, &ev); 357 } 358 359 /* process each rr3 encoded byte into an int */ 360 sig_size = be16_to_cpu(rr3->irdata.sig_size); 361 for (i = 0; i < sig_size; i++) { 362 offset = rr3->irdata.sigdata[i]; 363 val = get_unaligned_be16(&rr3->irdata.lens[offset]); 364 365 /* we should always get pulse/space/pulse/space samples */ 366 if (i % 2) 367 rawir.pulse = false; 368 else 369 rawir.pulse = true; 370 371 rawir.duration = redrat3_len_to_us(val); 372 /* cap the value to IR_MAX_DURATION */ 373 rawir.duration = (rawir.duration > IR_MAX_DURATION) ? 374 IR_MAX_DURATION : rawir.duration; 375 376 dev_dbg(dev, "storing %s with duration %d (i: %d)\n", 377 rawir.pulse ? "pulse" : "space", rawir.duration, i); 378 ir_raw_event_store_with_filter(rr3->rc, &rawir); 379 } 380 381 /* add a trailing space */ 382 rawir.pulse = false; 383 rawir.timeout = true; 384 rawir.duration = rr3->rc->timeout; 385 dev_dbg(dev, "storing trailing timeout with duration %d\n", 386 rawir.duration); 387 ir_raw_event_store_with_filter(rr3->rc, &rawir); 388 389 dev_dbg(dev, "calling ir_raw_event_handle\n"); 390 ir_raw_event_handle(rr3->rc); 391 } 392 393 /* Util fn to send rr3 cmds */ 394 static int redrat3_send_cmd(int cmd, struct redrat3_dev *rr3) 395 { 396 struct usb_device *udev; 397 u8 *data; 398 int res; 399 400 data = kzalloc(sizeof(u8), GFP_KERNEL); 401 if (!data) 402 return -ENOMEM; 403 404 udev = rr3->udev; 405 res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), cmd, 406 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 407 0x0000, 0x0000, data, sizeof(u8), 10000); 408 409 if (res < 0) { 410 dev_err(rr3->dev, "%s: Error sending rr3 cmd res %d, data %d", 411 __func__, res, *data); 412 res = -EIO; 413 } else 414 res = data[0]; 415 416 kfree(data); 417 418 return res; 419 } 420 421 /* Enables the long range detector and starts async receive */ 422 static int redrat3_enable_detector(struct redrat3_dev *rr3) 423 { 424 struct device *dev = rr3->dev; 425 u8 ret; 426 427 ret = redrat3_send_cmd(RR3_RC_DET_ENABLE, rr3); 428 if (ret != 0) 429 dev_dbg(dev, "%s: unexpected ret of %d\n", 430 __func__, ret); 431 432 ret = redrat3_send_cmd(RR3_RC_DET_STATUS, rr3); 433 if (ret != 1) { 434 dev_err(dev, "%s: detector status: %d, should be 1\n", 435 __func__, ret); 436 return -EIO; 437 } 438 439 ret = usb_submit_urb(rr3->narrow_urb, GFP_KERNEL); 440 if (ret) { 441 dev_err(rr3->dev, "narrow band urb failed: %d", ret); 442 return ret; 443 } 444 445 ret = usb_submit_urb(rr3->wide_urb, GFP_KERNEL); 446 if (ret) 447 dev_err(rr3->dev, "wide band urb failed: %d", ret); 448 449 return ret; 450 } 451 452 static inline void redrat3_delete(struct redrat3_dev *rr3, 453 struct usb_device *udev) 454 { 455 usb_kill_urb(rr3->narrow_urb); 456 usb_kill_urb(rr3->wide_urb); 457 usb_kill_urb(rr3->flash_urb); 458 usb_kill_urb(rr3->learn_urb); 459 usb_free_urb(rr3->narrow_urb); 460 usb_free_urb(rr3->wide_urb); 461 usb_free_urb(rr3->flash_urb); 462 usb_free_urb(rr3->learn_urb); 463 usb_free_coherent(udev, le16_to_cpu(rr3->ep_narrow->wMaxPacketSize), 464 rr3->bulk_in_buf, rr3->dma_in); 465 466 kfree(rr3); 467 } 468 469 static u32 redrat3_get_timeout(struct redrat3_dev *rr3) 470 { 471 __be32 *tmp; 472 u32 timeout = MS_TO_US(150); /* a sane default, if things go haywire */ 473 int len, ret, pipe; 474 475 len = sizeof(*tmp); 476 tmp = kzalloc(len, GFP_KERNEL); 477 if (!tmp) 478 return timeout; 479 480 pipe = usb_rcvctrlpipe(rr3->udev, 0); 481 ret = usb_control_msg(rr3->udev, pipe, RR3_GET_IR_PARAM, 482 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 483 RR3_IR_IO_SIG_TIMEOUT, 0, tmp, len, 5000); 484 if (ret != len) 485 dev_warn(rr3->dev, "Failed to read timeout from hardware\n"); 486 else { 487 timeout = redrat3_len_to_us(be32_to_cpup(tmp)); 488 489 dev_dbg(rr3->dev, "Got timeout of %d ms\n", timeout / 1000); 490 } 491 492 kfree(tmp); 493 494 return timeout; 495 } 496 497 static int redrat3_set_timeout(struct rc_dev *rc_dev, unsigned int timeoutus) 498 { 499 struct redrat3_dev *rr3 = rc_dev->priv; 500 struct usb_device *udev = rr3->udev; 501 struct device *dev = rr3->dev; 502 __be32 *timeout; 503 int ret; 504 505 timeout = kmalloc(sizeof(*timeout), GFP_KERNEL); 506 if (!timeout) 507 return -ENOMEM; 508 509 *timeout = cpu_to_be32(redrat3_us_to_len(timeoutus)); 510 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), RR3_SET_IR_PARAM, 511 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 512 RR3_IR_IO_SIG_TIMEOUT, 0, timeout, sizeof(*timeout), 513 25000); 514 dev_dbg(dev, "set ir parm timeout %d ret 0x%02x\n", 515 be32_to_cpu(*timeout), ret); 516 517 if (ret == sizeof(*timeout)) 518 ret = 0; 519 else if (ret >= 0) 520 ret = -EIO; 521 522 kfree(timeout); 523 524 return ret; 525 } 526 527 static void redrat3_reset(struct redrat3_dev *rr3) 528 { 529 struct usb_device *udev = rr3->udev; 530 struct device *dev = rr3->dev; 531 int rc, rxpipe, txpipe; 532 u8 *val; 533 size_t const len = sizeof(*val); 534 535 rxpipe = usb_rcvctrlpipe(udev, 0); 536 txpipe = usb_sndctrlpipe(udev, 0); 537 538 val = kmalloc(len, GFP_KERNEL); 539 if (!val) 540 return; 541 542 *val = 0x01; 543 rc = usb_control_msg(udev, rxpipe, RR3_RESET, 544 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 545 RR3_CPUCS_REG_ADDR, 0, val, len, 25000); 546 dev_dbg(dev, "reset returned 0x%02x\n", rc); 547 548 *val = length_fuzz; 549 rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM, 550 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 551 RR3_IR_IO_LENGTH_FUZZ, 0, val, len, 25000); 552 dev_dbg(dev, "set ir parm len fuzz %d rc 0x%02x\n", *val, rc); 553 554 *val = (65536 - (minimum_pause * 2000)) / 256; 555 rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM, 556 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 557 RR3_IR_IO_MIN_PAUSE, 0, val, len, 25000); 558 dev_dbg(dev, "set ir parm min pause %d rc 0x%02x\n", *val, rc); 559 560 *val = periods_measure_carrier; 561 rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM, 562 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 563 RR3_IR_IO_PERIODS_MF, 0, val, len, 25000); 564 dev_dbg(dev, "set ir parm periods measure carrier %d rc 0x%02x", *val, 565 rc); 566 567 *val = RR3_DRIVER_MAXLENS; 568 rc = usb_control_msg(udev, txpipe, RR3_SET_IR_PARAM, 569 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 570 RR3_IR_IO_MAX_LENGTHS, 0, val, len, 25000); 571 dev_dbg(dev, "set ir parm max lens %d rc 0x%02x\n", *val, rc); 572 573 kfree(val); 574 } 575 576 static void redrat3_get_firmware_rev(struct redrat3_dev *rr3) 577 { 578 int rc; 579 char *buffer; 580 581 buffer = kcalloc(RR3_FW_VERSION_LEN + 1, sizeof(*buffer), GFP_KERNEL); 582 if (!buffer) 583 return; 584 585 rc = usb_control_msg(rr3->udev, usb_rcvctrlpipe(rr3->udev, 0), 586 RR3_FW_VERSION, 587 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 588 0, 0, buffer, RR3_FW_VERSION_LEN, 5000); 589 590 if (rc >= 0) 591 dev_info(rr3->dev, "Firmware rev: %s", buffer); 592 else 593 dev_err(rr3->dev, "Problem fetching firmware ID\n"); 594 595 kfree(buffer); 596 } 597 598 static void redrat3_read_packet_start(struct redrat3_dev *rr3, unsigned len) 599 { 600 struct redrat3_header *header = rr3->bulk_in_buf; 601 unsigned pktlen, pkttype; 602 603 /* grab the Length and type of transfer */ 604 pktlen = be16_to_cpu(header->length); 605 pkttype = be16_to_cpu(header->transfer_type); 606 607 if (pktlen > sizeof(rr3->irdata)) { 608 dev_warn(rr3->dev, "packet length %u too large\n", pktlen); 609 return; 610 } 611 612 switch (pkttype) { 613 case RR3_ERROR: 614 if (len >= sizeof(struct redrat3_error)) { 615 struct redrat3_error *error = rr3->bulk_in_buf; 616 unsigned fw_error = be16_to_cpu(error->fw_error); 617 redrat3_dump_fw_error(rr3, fw_error); 618 } 619 break; 620 621 case RR3_MOD_SIGNAL_IN: 622 memcpy(&rr3->irdata, rr3->bulk_in_buf, len); 623 rr3->bytes_read = len; 624 dev_dbg(rr3->dev, "bytes_read %d, pktlen %d\n", 625 rr3->bytes_read, pktlen); 626 break; 627 628 default: 629 dev_dbg(rr3->dev, "ignoring packet with type 0x%02x, len of %d, 0x%02x\n", 630 pkttype, len, pktlen); 631 break; 632 } 633 } 634 635 static void redrat3_read_packet_continue(struct redrat3_dev *rr3, unsigned len) 636 { 637 void *irdata = &rr3->irdata; 638 639 if (len + rr3->bytes_read > sizeof(rr3->irdata)) { 640 dev_warn(rr3->dev, "too much data for packet\n"); 641 rr3->bytes_read = 0; 642 return; 643 } 644 645 memcpy(irdata + rr3->bytes_read, rr3->bulk_in_buf, len); 646 647 rr3->bytes_read += len; 648 dev_dbg(rr3->dev, "bytes_read %d, pktlen %d\n", rr3->bytes_read, 649 be16_to_cpu(rr3->irdata.header.length)); 650 } 651 652 /* gather IR data from incoming urb, process it when we have enough */ 653 static int redrat3_get_ir_data(struct redrat3_dev *rr3, unsigned len) 654 { 655 struct device *dev = rr3->dev; 656 unsigned pkttype; 657 int ret = 0; 658 659 if (rr3->bytes_read == 0 && len >= sizeof(struct redrat3_header)) { 660 redrat3_read_packet_start(rr3, len); 661 } else if (rr3->bytes_read != 0) { 662 redrat3_read_packet_continue(rr3, len); 663 } else if (rr3->bytes_read == 0) { 664 dev_err(dev, "error: no packet data read\n"); 665 ret = -ENODATA; 666 goto out; 667 } 668 669 if (rr3->bytes_read < be16_to_cpu(rr3->irdata.header.length) + 670 sizeof(struct redrat3_header)) 671 /* we're still accumulating data */ 672 return 0; 673 674 /* if we get here, we've got IR data to decode */ 675 pkttype = be16_to_cpu(rr3->irdata.header.transfer_type); 676 if (pkttype == RR3_MOD_SIGNAL_IN) 677 redrat3_process_ir_data(rr3); 678 else 679 dev_dbg(dev, "discarding non-signal data packet (type 0x%02x)\n", 680 pkttype); 681 682 out: 683 rr3->bytes_read = 0; 684 return ret; 685 } 686 687 /* callback function from USB when async USB request has completed */ 688 static void redrat3_handle_async(struct urb *urb) 689 { 690 struct redrat3_dev *rr3 = urb->context; 691 int ret; 692 693 switch (urb->status) { 694 case 0: 695 ret = redrat3_get_ir_data(rr3, urb->actual_length); 696 if (!ret && rr3->wideband && !rr3->learn_urb->hcpriv) { 697 ret = usb_submit_urb(rr3->learn_urb, GFP_ATOMIC); 698 if (ret) 699 dev_err(rr3->dev, "Failed to submit learning urb: %d", 700 ret); 701 } 702 703 if (!ret) { 704 /* no error, prepare to read more */ 705 ret = usb_submit_urb(urb, GFP_ATOMIC); 706 if (ret) 707 dev_err(rr3->dev, "Failed to resubmit urb: %d", 708 ret); 709 } 710 break; 711 712 case -ECONNRESET: 713 case -ENOENT: 714 case -ESHUTDOWN: 715 usb_unlink_urb(urb); 716 return; 717 718 case -EPIPE: 719 default: 720 dev_warn(rr3->dev, "Error: urb status = %d\n", urb->status); 721 rr3->bytes_read = 0; 722 break; 723 } 724 } 725 726 static u16 mod_freq_to_val(unsigned int mod_freq) 727 { 728 int mult = 6000000; 729 730 /* Clk used in mod. freq. generation is CLK24/4. */ 731 return 65536 - (mult / mod_freq); 732 } 733 734 static int redrat3_set_tx_carrier(struct rc_dev *rcdev, u32 carrier) 735 { 736 struct redrat3_dev *rr3 = rcdev->priv; 737 struct device *dev = rr3->dev; 738 739 dev_dbg(dev, "Setting modulation frequency to %u", carrier); 740 if (carrier == 0) 741 return -EINVAL; 742 743 rr3->carrier = carrier; 744 745 return 0; 746 } 747 748 static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf, 749 unsigned count) 750 { 751 struct redrat3_dev *rr3 = rcdev->priv; 752 struct device *dev = rr3->dev; 753 struct redrat3_irdata *irdata = NULL; 754 int ret, ret_len; 755 int lencheck, cur_sample_len, pipe; 756 int *sample_lens = NULL; 757 u8 curlencheck = 0; 758 unsigned i, sendbuf_len; 759 760 if (rr3->transmitting) { 761 dev_warn(dev, "%s: transmitter already in use\n", __func__); 762 return -EAGAIN; 763 } 764 765 if (count > RR3_MAX_SIG_SIZE - RR3_TX_TRAILER_LEN) 766 return -EINVAL; 767 768 /* rr3 will disable rc detector on transmit */ 769 rr3->transmitting = true; 770 771 sample_lens = kcalloc(RR3_DRIVER_MAXLENS, 772 sizeof(*sample_lens), 773 GFP_KERNEL); 774 if (!sample_lens) 775 return -ENOMEM; 776 777 irdata = kzalloc(sizeof(*irdata), GFP_KERNEL); 778 if (!irdata) { 779 ret = -ENOMEM; 780 goto out; 781 } 782 783 for (i = 0; i < count; i++) { 784 cur_sample_len = redrat3_us_to_len(txbuf[i]); 785 if (cur_sample_len > 0xffff) { 786 dev_warn(dev, "transmit period of %uus truncated to %uus\n", 787 txbuf[i], redrat3_len_to_us(0xffff)); 788 cur_sample_len = 0xffff; 789 } 790 for (lencheck = 0; lencheck < curlencheck; lencheck++) { 791 if (sample_lens[lencheck] == cur_sample_len) 792 break; 793 } 794 if (lencheck == curlencheck) { 795 dev_dbg(dev, "txbuf[%d]=%u, pos %d, enc %u\n", 796 i, txbuf[i], curlencheck, cur_sample_len); 797 if (curlencheck < RR3_DRIVER_MAXLENS) { 798 /* now convert the value to a proper 799 * rr3 value.. */ 800 sample_lens[curlencheck] = cur_sample_len; 801 put_unaligned_be16(cur_sample_len, 802 &irdata->lens[curlencheck]); 803 curlencheck++; 804 } else { 805 ret = -EINVAL; 806 goto out; 807 } 808 } 809 irdata->sigdata[i] = lencheck; 810 } 811 812 irdata->sigdata[count] = RR3_END_OF_SIGNAL; 813 irdata->sigdata[count + 1] = RR3_END_OF_SIGNAL; 814 815 sendbuf_len = offsetof(struct redrat3_irdata, 816 sigdata[count + RR3_TX_TRAILER_LEN]); 817 /* fill in our packet header */ 818 irdata->header.length = cpu_to_be16(sendbuf_len - 819 sizeof(struct redrat3_header)); 820 irdata->header.transfer_type = cpu_to_be16(RR3_MOD_SIGNAL_OUT); 821 irdata->pause = cpu_to_be32(redrat3_len_to_us(100)); 822 irdata->mod_freq_count = cpu_to_be16(mod_freq_to_val(rr3->carrier)); 823 irdata->no_lengths = curlencheck; 824 irdata->sig_size = cpu_to_be16(count + RR3_TX_TRAILER_LEN); 825 826 pipe = usb_sndbulkpipe(rr3->udev, rr3->ep_out->bEndpointAddress); 827 ret = usb_bulk_msg(rr3->udev, pipe, irdata, 828 sendbuf_len, &ret_len, 10000); 829 dev_dbg(dev, "sent %d bytes, (ret %d)\n", ret_len, ret); 830 831 /* now tell the hardware to transmit what we sent it */ 832 pipe = usb_rcvctrlpipe(rr3->udev, 0); 833 ret = usb_control_msg(rr3->udev, pipe, RR3_TX_SEND_SIGNAL, 834 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 835 0, 0, irdata, 2, 10000); 836 837 if (ret < 0) 838 dev_err(dev, "Error: control msg send failed, rc %d\n", ret); 839 else 840 ret = count; 841 842 out: 843 kfree(irdata); 844 kfree(sample_lens); 845 846 rr3->transmitting = false; 847 /* rr3 re-enables rc detector because it was enabled before */ 848 849 return ret; 850 } 851 852 static void redrat3_brightness_set(struct led_classdev *led_dev, enum 853 led_brightness brightness) 854 { 855 struct redrat3_dev *rr3 = container_of(led_dev, struct redrat3_dev, 856 led); 857 858 if (brightness != LED_OFF && atomic_cmpxchg(&rr3->flash, 0, 1) == 0) { 859 int ret = usb_submit_urb(rr3->flash_urb, GFP_ATOMIC); 860 if (ret != 0) { 861 dev_dbg(rr3->dev, "%s: unexpected ret of %d\n", 862 __func__, ret); 863 atomic_set(&rr3->flash, 0); 864 } 865 } 866 } 867 868 static int redrat3_wideband_receiver(struct rc_dev *rcdev, int enable) 869 { 870 struct redrat3_dev *rr3 = rcdev->priv; 871 int ret = 0; 872 873 rr3->wideband = enable != 0; 874 875 if (enable) { 876 ret = usb_submit_urb(rr3->learn_urb, GFP_KERNEL); 877 if (ret) 878 dev_err(rr3->dev, "Failed to submit learning urb: %d", 879 ret); 880 } 881 882 return ret; 883 } 884 885 static void redrat3_learn_complete(struct urb *urb) 886 { 887 struct redrat3_dev *rr3 = urb->context; 888 889 switch (urb->status) { 890 case 0: 891 break; 892 case -ECONNRESET: 893 case -ENOENT: 894 case -ESHUTDOWN: 895 usb_unlink_urb(urb); 896 return; 897 case -EPIPE: 898 default: 899 dev_err(rr3->dev, "Error: learn urb status = %d", urb->status); 900 break; 901 } 902 } 903 904 static void redrat3_led_complete(struct urb *urb) 905 { 906 struct redrat3_dev *rr3 = urb->context; 907 908 switch (urb->status) { 909 case 0: 910 break; 911 case -ECONNRESET: 912 case -ENOENT: 913 case -ESHUTDOWN: 914 usb_unlink_urb(urb); 915 return; 916 case -EPIPE: 917 default: 918 dev_dbg(rr3->dev, "Error: urb status = %d\n", urb->status); 919 break; 920 } 921 922 rr3->led.brightness = LED_OFF; 923 atomic_dec(&rr3->flash); 924 } 925 926 static struct rc_dev *redrat3_init_rc_dev(struct redrat3_dev *rr3) 927 { 928 struct device *dev = rr3->dev; 929 struct rc_dev *rc; 930 int ret; 931 u16 prod = le16_to_cpu(rr3->udev->descriptor.idProduct); 932 933 rc = rc_allocate_device(RC_DRIVER_IR_RAW); 934 if (!rc) 935 return NULL; 936 937 snprintf(rr3->name, sizeof(rr3->name), 938 "RedRat3%s Infrared Remote Transceiver", 939 prod == USB_RR3IIUSB_PRODUCT_ID ? "-II" : ""); 940 941 usb_make_path(rr3->udev, rr3->phys, sizeof(rr3->phys)); 942 943 rc->device_name = rr3->name; 944 rc->input_phys = rr3->phys; 945 usb_to_input_id(rr3->udev, &rc->input_id); 946 rc->dev.parent = dev; 947 rc->priv = rr3; 948 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 949 rc->min_timeout = MS_TO_US(RR3_RX_MIN_TIMEOUT); 950 rc->max_timeout = MS_TO_US(RR3_RX_MAX_TIMEOUT); 951 rc->timeout = redrat3_get_timeout(rr3); 952 rc->s_timeout = redrat3_set_timeout; 953 rc->tx_ir = redrat3_transmit_ir; 954 rc->s_tx_carrier = redrat3_set_tx_carrier; 955 rc->s_carrier_report = redrat3_wideband_receiver; 956 rc->driver_name = DRIVER_NAME; 957 rc->rx_resolution = 2; 958 rc->map_name = RC_MAP_HAUPPAUGE; 959 960 ret = rc_register_device(rc); 961 if (ret < 0) { 962 dev_err(dev, "remote dev registration failed\n"); 963 goto out; 964 } 965 966 return rc; 967 968 out: 969 rc_free_device(rc); 970 return NULL; 971 } 972 973 static int redrat3_dev_probe(struct usb_interface *intf, 974 const struct usb_device_id *id) 975 { 976 struct usb_device *udev = interface_to_usbdev(intf); 977 struct device *dev = &intf->dev; 978 struct usb_host_interface *uhi; 979 struct redrat3_dev *rr3; 980 struct usb_endpoint_descriptor *ep; 981 struct usb_endpoint_descriptor *ep_narrow = NULL; 982 struct usb_endpoint_descriptor *ep_wide = NULL; 983 struct usb_endpoint_descriptor *ep_out = NULL; 984 u8 addr, attrs; 985 int pipe, i; 986 int retval = -ENOMEM; 987 988 uhi = intf->cur_altsetting; 989 990 /* find our bulk-in and bulk-out endpoints */ 991 for (i = 0; i < uhi->desc.bNumEndpoints; ++i) { 992 ep = &uhi->endpoint[i].desc; 993 addr = ep->bEndpointAddress; 994 attrs = ep->bmAttributes; 995 996 if (((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 997 ((attrs & USB_ENDPOINT_XFERTYPE_MASK) == 998 USB_ENDPOINT_XFER_BULK)) { 999 dev_dbg(dev, "found bulk-in endpoint at 0x%02x\n", 1000 ep->bEndpointAddress); 1001 /* data comes in on 0x82, 0x81 is for learning */ 1002 if (ep->bEndpointAddress == RR3_NARROW_IN_EP_ADDR) 1003 ep_narrow = ep; 1004 if (ep->bEndpointAddress == RR3_WIDE_IN_EP_ADDR) 1005 ep_wide = ep; 1006 } 1007 1008 if ((ep_out == NULL) && 1009 ((addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 1010 ((attrs & USB_ENDPOINT_XFERTYPE_MASK) == 1011 USB_ENDPOINT_XFER_BULK)) { 1012 dev_dbg(dev, "found bulk-out endpoint at 0x%02x\n", 1013 ep->bEndpointAddress); 1014 ep_out = ep; 1015 } 1016 } 1017 1018 if (!ep_narrow || !ep_out || !ep_wide) { 1019 dev_err(dev, "Couldn't find all endpoints\n"); 1020 retval = -ENODEV; 1021 goto no_endpoints; 1022 } 1023 1024 /* allocate memory for our device state and initialize it */ 1025 rr3 = kzalloc(sizeof(*rr3), GFP_KERNEL); 1026 if (!rr3) 1027 goto no_endpoints; 1028 1029 rr3->dev = &intf->dev; 1030 rr3->ep_narrow = ep_narrow; 1031 rr3->ep_out = ep_out; 1032 rr3->udev = udev; 1033 1034 /* set up bulk-in endpoint */ 1035 rr3->narrow_urb = usb_alloc_urb(0, GFP_KERNEL); 1036 if (!rr3->narrow_urb) 1037 goto redrat_free; 1038 1039 rr3->wide_urb = usb_alloc_urb(0, GFP_KERNEL); 1040 if (!rr3->wide_urb) 1041 goto redrat_free; 1042 1043 rr3->bulk_in_buf = usb_alloc_coherent(udev, 1044 le16_to_cpu(ep_narrow->wMaxPacketSize), 1045 GFP_KERNEL, &rr3->dma_in); 1046 if (!rr3->bulk_in_buf) 1047 goto redrat_free; 1048 1049 pipe = usb_rcvbulkpipe(udev, ep_narrow->bEndpointAddress); 1050 usb_fill_bulk_urb(rr3->narrow_urb, udev, pipe, rr3->bulk_in_buf, 1051 le16_to_cpu(ep_narrow->wMaxPacketSize), 1052 redrat3_handle_async, rr3); 1053 rr3->narrow_urb->transfer_dma = rr3->dma_in; 1054 rr3->narrow_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1055 1056 pipe = usb_rcvbulkpipe(udev, ep_wide->bEndpointAddress); 1057 usb_fill_bulk_urb(rr3->wide_urb, udev, pipe, rr3->bulk_in_buf, 1058 le16_to_cpu(ep_narrow->wMaxPacketSize), 1059 redrat3_handle_async, rr3); 1060 rr3->wide_urb->transfer_dma = rr3->dma_in; 1061 rr3->wide_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1062 1063 redrat3_reset(rr3); 1064 redrat3_get_firmware_rev(rr3); 1065 1066 /* default.. will get overridden by any sends with a freq defined */ 1067 rr3->carrier = 38000; 1068 1069 atomic_set(&rr3->flash, 0); 1070 rr3->flash_urb = usb_alloc_urb(0, GFP_KERNEL); 1071 if (!rr3->flash_urb) 1072 goto redrat_free; 1073 1074 /* learn urb */ 1075 rr3->learn_urb = usb_alloc_urb(0, GFP_KERNEL); 1076 if (!rr3->learn_urb) 1077 goto redrat_free; 1078 1079 /* setup packet is 'c0 b2 0000 0000 0001' */ 1080 rr3->learn_control.bRequestType = 0xc0; 1081 rr3->learn_control.bRequest = RR3_MODSIG_CAPTURE; 1082 rr3->learn_control.wLength = cpu_to_le16(1); 1083 1084 usb_fill_control_urb(rr3->learn_urb, udev, usb_rcvctrlpipe(udev, 0), 1085 (unsigned char *)&rr3->learn_control, 1086 &rr3->learn_buf, sizeof(rr3->learn_buf), 1087 redrat3_learn_complete, rr3); 1088 1089 /* setup packet is 'c0 b9 0000 0000 0001' */ 1090 rr3->flash_control.bRequestType = 0xc0; 1091 rr3->flash_control.bRequest = RR3_BLINK_LED; 1092 rr3->flash_control.wLength = cpu_to_le16(1); 1093 1094 usb_fill_control_urb(rr3->flash_urb, udev, usb_rcvctrlpipe(udev, 0), 1095 (unsigned char *)&rr3->flash_control, 1096 &rr3->flash_in_buf, sizeof(rr3->flash_in_buf), 1097 redrat3_led_complete, rr3); 1098 1099 /* led control */ 1100 rr3->led.name = "redrat3:red:feedback"; 1101 rr3->led.default_trigger = "rc-feedback"; 1102 rr3->led.brightness_set = redrat3_brightness_set; 1103 retval = led_classdev_register(&intf->dev, &rr3->led); 1104 if (retval) 1105 goto redrat_free; 1106 1107 rr3->rc = redrat3_init_rc_dev(rr3); 1108 if (!rr3->rc) { 1109 retval = -ENOMEM; 1110 goto led_free; 1111 } 1112 1113 /* might be all we need to do? */ 1114 retval = redrat3_enable_detector(rr3); 1115 if (retval < 0) 1116 goto led_free; 1117 1118 /* we can register the device now, as it is ready */ 1119 usb_set_intfdata(intf, rr3); 1120 1121 return 0; 1122 1123 led_free: 1124 led_classdev_unregister(&rr3->led); 1125 redrat_free: 1126 redrat3_delete(rr3, rr3->udev); 1127 1128 no_endpoints: 1129 return retval; 1130 } 1131 1132 static void redrat3_dev_disconnect(struct usb_interface *intf) 1133 { 1134 struct usb_device *udev = interface_to_usbdev(intf); 1135 struct redrat3_dev *rr3 = usb_get_intfdata(intf); 1136 1137 usb_set_intfdata(intf, NULL); 1138 rc_unregister_device(rr3->rc); 1139 led_classdev_unregister(&rr3->led); 1140 redrat3_delete(rr3, udev); 1141 } 1142 1143 static int redrat3_dev_suspend(struct usb_interface *intf, pm_message_t message) 1144 { 1145 struct redrat3_dev *rr3 = usb_get_intfdata(intf); 1146 1147 led_classdev_suspend(&rr3->led); 1148 usb_kill_urb(rr3->narrow_urb); 1149 usb_kill_urb(rr3->wide_urb); 1150 usb_kill_urb(rr3->flash_urb); 1151 return 0; 1152 } 1153 1154 static int redrat3_dev_resume(struct usb_interface *intf) 1155 { 1156 struct redrat3_dev *rr3 = usb_get_intfdata(intf); 1157 1158 if (usb_submit_urb(rr3->narrow_urb, GFP_NOIO)) 1159 return -EIO; 1160 if (usb_submit_urb(rr3->wide_urb, GFP_NOIO)) 1161 return -EIO; 1162 led_classdev_resume(&rr3->led); 1163 return 0; 1164 } 1165 1166 static struct usb_driver redrat3_dev_driver = { 1167 .name = DRIVER_NAME, 1168 .probe = redrat3_dev_probe, 1169 .disconnect = redrat3_dev_disconnect, 1170 .suspend = redrat3_dev_suspend, 1171 .resume = redrat3_dev_resume, 1172 .reset_resume = redrat3_dev_resume, 1173 .id_table = redrat3_dev_table 1174 }; 1175 1176 module_usb_driver(redrat3_dev_driver); 1177 1178 MODULE_DESCRIPTION(DRIVER_DESC); 1179 MODULE_AUTHOR(DRIVER_AUTHOR); 1180 MODULE_AUTHOR(DRIVER_AUTHOR2); 1181 MODULE_LICENSE("GPL"); 1182 MODULE_DEVICE_TABLE(usb, redrat3_dev_table); 1183