dt9812.c revision 9a52ef3f1d433d1c6302fbae114d48665f1c6008
1/* 2 * comedi/drivers/dt9812.c 3 * COMEDI driver for DataTranslation DT9812 USB module 4 * 5 * Copyright (C) 2005 Anders Blomdell <anders.blomdell@control.lth.se> 6 * 7 * COMEDI - Linux Control and Measurement Device Interface 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * 23 */ 24 25/* 26Driver: dt9812 27Description: Data Translation DT9812 USB module 28Author: anders.blomdell@control.lth.se (Anders Blomdell) 29Status: in development 30Devices: [Data Translation] DT9812 (dt9812) 31Updated: Sun Nov 20 20:18:34 EST 2005 32 33This driver works, but bulk transfers not implemented. Might be a starting point 34for someone else. I found out too late that USB has too high latencies (>1 ms) 35for my needs. 36*/ 37 38/* 39 * Nota Bene: 40 * 1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?) 41 * 2. The DDK source (as of sep 2005) is in error regarding the 42 * input MUX bits (example code says P4, but firmware schematics 43 * says P1). 44 */ 45 46#include <linux/kernel.h> 47#include <linux/errno.h> 48#include <linux/init.h> 49#include <linux/slab.h> 50#include <linux/module.h> 51#include <linux/kref.h> 52#include <linux/uaccess.h> 53#include <linux/usb.h> 54 55#include "../comedidev.h" 56 57#define DT9812_DIAGS_BOARD_INFO_ADDR 0xFBFF 58#define DT9812_MAX_WRITE_CMD_PIPE_SIZE 32 59#define DT9812_MAX_READ_CMD_PIPE_SIZE 32 60 61/* 62 * See Silican Laboratories C8051F020/1/2/3 manual 63 */ 64#define F020_SFR_P4 0x84 65#define F020_SFR_P1 0x90 66#define F020_SFR_P2 0xa0 67#define F020_SFR_P3 0xb0 68#define F020_SFR_AMX0CF 0xba 69#define F020_SFR_AMX0SL 0xbb 70#define F020_SFR_ADC0CF 0xbc 71#define F020_SFR_ADC0L 0xbe 72#define F020_SFR_ADC0H 0xbf 73#define F020_SFR_DAC0L 0xd2 74#define F020_SFR_DAC0H 0xd3 75#define F020_SFR_DAC0CN 0xd4 76#define F020_SFR_DAC1L 0xd5 77#define F020_SFR_DAC1H 0xd6 78#define F020_SFR_DAC1CN 0xd7 79#define F020_SFR_ADC0CN 0xe8 80 81#define F020_MASK_ADC0CF_AMP0GN0 0x01 82#define F020_MASK_ADC0CF_AMP0GN1 0x02 83#define F020_MASK_ADC0CF_AMP0GN2 0x04 84 85#define F020_MASK_ADC0CN_AD0EN 0x80 86#define F020_MASK_ADC0CN_AD0INT 0x20 87#define F020_MASK_ADC0CN_AD0BUSY 0x10 88 89#define F020_MASK_DACxCN_DACxEN 0x80 90 91enum { 92 /* A/D D/A DI DO CT */ 93 DT9812_DEVID_DT9812_10, /* 8 2 8 8 1 +/- 10V */ 94 DT9812_DEVID_DT9812_2PT5,/* 8 2 8 8 1 0-2.44V */ 95#if 0 96 DT9812_DEVID_DT9813, /* 16 2 4 4 1 +/- 10V */ 97 DT9812_DEVID_DT9814 /* 24 2 0 0 1 +/- 10V */ 98#endif 99}; 100 101enum dt9812_gain { 102 DT9812_GAIN_0PT25 = 1, 103 DT9812_GAIN_0PT5 = 2, 104 DT9812_GAIN_1 = 4, 105 DT9812_GAIN_2 = 8, 106 DT9812_GAIN_4 = 16, 107 DT9812_GAIN_8 = 32, 108 DT9812_GAIN_16 = 64, 109}; 110 111enum { 112 DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0, 113 /* Write Flash memory */ 114 DT9812_W_FLASH_DATA = 0, 115 /* Read Flash memory misc config info */ 116 DT9812_R_FLASH_DATA = 1, 117 118 /* 119 * Register read/write commands for processor 120 */ 121 122 /* Read a single byte of USB memory */ 123 DT9812_R_SINGLE_BYTE_REG = 2, 124 /* Write a single byte of USB memory */ 125 DT9812_W_SINGLE_BYTE_REG = 3, 126 /* Multiple Reads of USB memory */ 127 DT9812_R_MULTI_BYTE_REG = 4, 128 /* Multiple Writes of USB memory */ 129 DT9812_W_MULTI_BYTE_REG = 5, 130 /* Read, (AND) with mask, OR value, then write (single) */ 131 DT9812_RMW_SINGLE_BYTE_REG = 6, 132 /* Read, (AND) with mask, OR value, then write (multiple) */ 133 DT9812_RMW_MULTI_BYTE_REG = 7, 134 135 /* 136 * Register read/write commands for SMBus 137 */ 138 139 /* Read a single byte of SMBus */ 140 DT9812_R_SINGLE_BYTE_SMBUS = 8, 141 /* Write a single byte of SMBus */ 142 DT9812_W_SINGLE_BYTE_SMBUS = 9, 143 /* Multiple Reads of SMBus */ 144 DT9812_R_MULTI_BYTE_SMBUS = 10, 145 /* Multiple Writes of SMBus */ 146 DT9812_W_MULTI_BYTE_SMBUS = 11, 147 148 /* 149 * Register read/write commands for a device 150 */ 151 152 /* Read a single byte of a device */ 153 DT9812_R_SINGLE_BYTE_DEV = 12, 154 /* Write a single byte of a device */ 155 DT9812_W_SINGLE_BYTE_DEV = 13, 156 /* Multiple Reads of a device */ 157 DT9812_R_MULTI_BYTE_DEV = 14, 158 /* Multiple Writes of a device */ 159 DT9812_W_MULTI_BYTE_DEV = 15, 160 161 /* Not sure if we'll need this */ 162 DT9812_W_DAC_THRESHOLD = 16, 163 164 /* Set interrupt on change mask */ 165 DT9812_W_INT_ON_CHANGE_MASK = 17, 166 167 /* Write (or Clear) the CGL for the ADC */ 168 DT9812_W_CGL = 18, 169 /* Multiple Reads of USB memory */ 170 DT9812_R_MULTI_BYTE_USBMEM = 19, 171 /* Multiple Writes to USB memory */ 172 DT9812_W_MULTI_BYTE_USBMEM = 20, 173 174 /* Issue a start command to a given subsystem */ 175 DT9812_START_SUBSYSTEM = 21, 176 /* Issue a stop command to a given subsystem */ 177 DT9812_STOP_SUBSYSTEM = 22, 178 179 /* calibrate the board using CAL_POT_CMD */ 180 DT9812_CALIBRATE_POT = 23, 181 /* set the DAC FIFO size */ 182 DT9812_W_DAC_FIFO_SIZE = 24, 183 /* Write or Clear the CGL for the DAC */ 184 DT9812_W_CGL_DAC = 25, 185 /* Read a single value from a subsystem */ 186 DT9812_R_SINGLE_VALUE_CMD = 26, 187 /* Write a single value to a subsystem */ 188 DT9812_W_SINGLE_VALUE_CMD = 27, 189 /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */ 190 DT9812_MAX_USB_FIRMWARE_CMD_CODE, 191}; 192 193struct dt9812_flash_data { 194 u16 numbytes; 195 u16 address; 196}; 197 198#define DT9812_MAX_NUM_MULTI_BYTE_RDS \ 199 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8)) 200 201struct dt9812_read_multi { 202 u8 count; 203 u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS]; 204}; 205 206struct dt9812_write_byte { 207 u8 address; 208 u8 value; 209}; 210 211#define DT9812_MAX_NUM_MULTI_BYTE_WRTS \ 212 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \ 213 sizeof(struct dt9812_write_byte)) 214 215struct dt9812_write_multi { 216 u8 count; 217 struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS]; 218}; 219 220struct dt9812_rmw_byte { 221 u8 address; 222 u8 and_mask; 223 u8 or_value; 224}; 225 226#define DT9812_MAX_NUM_MULTI_BYTE_RMWS \ 227 ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(struct dt9812_rmw_byte)) 228 229struct dt9812_rmw_multi { 230 u8 count; 231 struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS]; 232}; 233 234struct dt9812_usb_cmd { 235 u32 cmd; 236 union { 237 struct dt9812_flash_data flash_data_info; 238 struct dt9812_read_multi read_multi_info; 239 struct dt9812_write_multi write_multi_info; 240 struct dt9812_rmw_multi rmw_multi_info; 241 } u; 242#if 0 243 WRITE_BYTE_INFO WriteByteInfo; 244 READ_BYTE_INFO ReadByteInfo; 245 WRITE_MULTI_INFO WriteMultiInfo; 246 READ_MULTI_INFO ReadMultiInfo; 247 RMW_BYTE_INFO RMWByteInfo; 248 RMW_MULTI_INFO RMWMultiInfo; 249 DAC_THRESHOLD_INFO DacThresholdInfo; 250 INT_ON_CHANGE_MASK_INFO IntOnChangeMaskInfo; 251 CGL_INFO CglInfo; 252 SUBSYSTEM_INFO SubsystemInfo; 253 CAL_POT_CMD CalPotCmd; 254 WRITE_DEV_BYTE_INFO WriteDevByteInfo; 255 READ_DEV_BYTE_INFO ReadDevByteInfo; 256 WRITE_DEV_MULTI_INFO WriteDevMultiInfo; 257 READ_DEV_MULTI_INFO ReadDevMultiInfo; 258 READ_SINGLE_VALUE_INFO ReadSingleValueInfo; 259 WRITE_SINGLE_VALUE_INFO WriteSingleValueInfo; 260#endif 261}; 262 263#define DT9812_NUM_SLOTS 16 264 265static DECLARE_MUTEX(dt9812_mutex); 266 267static struct usb_device_id dt9812_table[] = { 268 {USB_DEVICE(0x0867, 0x9812)}, 269 { } /* Terminating entry */ 270}; 271 272MODULE_DEVICE_TABLE(usb, dt9812_table); 273 274struct usb_dt9812 { 275 struct slot_dt9812 *slot; 276 struct usb_device *udev; 277 struct usb_interface *interface; 278 u16 vendor; 279 u16 product; 280 u16 device; 281 u32 serial; 282 struct { 283 __u8 addr; 284 size_t size; 285 } message_pipe, command_write, command_read, write_stream, read_stream; 286 struct kref kref; 287 u16 analog_out_shadow[2]; 288 u8 digital_out_shadow; 289}; 290 291struct comedi_dt9812 { 292 struct slot_dt9812 *slot; 293 u32 serial; 294}; 295 296struct slot_dt9812 { 297 struct semaphore mutex; 298 u32 serial; 299 struct usb_dt9812 *usb; 300 struct comedi_dt9812 *comedi; 301}; 302 303static const comedi_lrange dt9812_10_ain_range = { 1, { 304 BIP_RANGE(10), 305 } 306}; 307 308static const comedi_lrange dt9812_2pt5_ain_range = { 1, { 309 UNI_RANGE(2.5), 310 } 311}; 312 313static const comedi_lrange dt9812_10_aout_range = { 1, { 314 BIP_RANGE(10), 315 } 316}; 317 318static const comedi_lrange dt9812_2pt5_aout_range = { 1, { 319 UNI_RANGE(2.5), 320 } 321}; 322 323static struct slot_dt9812 dt9812[DT9812_NUM_SLOTS]; 324 325/* Useful shorthand access to private data */ 326#define devpriv ((struct comedi_dt9812 *)dev->private) 327 328static inline struct usb_dt9812 *to_dt9812_dev(struct kref *d) 329{ 330 return container_of(d, struct usb_dt9812, kref); 331} 332 333static void dt9812_delete(struct kref *kref) 334{ 335 struct usb_dt9812 *dev = to_dt9812_dev(kref); 336 337 usb_put_dev(dev->udev); 338 kfree(dev); 339} 340 341static int dt9812_read_info(struct usb_dt9812 *dev, int offset, void *buf, 342 size_t buf_size) 343{ 344 struct dt9812_usb_cmd cmd; 345 int count, retval; 346 347 cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA); 348 cmd.u.flash_data_info.address = 349 cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset); 350 cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size); 351 352 /* DT9812 only responds to 32 byte writes!! */ 353 count = 32; 354 retval = usb_bulk_msg(dev->udev, 355 usb_sndbulkpipe(dev->udev, 356 dev->command_write.addr), 357 &cmd, 32, &count, HZ * 1); 358 if (retval) 359 return retval; 360 retval = usb_bulk_msg(dev->udev, 361 usb_rcvbulkpipe(dev->udev, 362 dev->command_read.addr), 363 buf, buf_size, &count, HZ * 1); 364 return retval; 365} 366 367static int dt9812_read_multiple_registers(struct usb_dt9812 *dev, int reg_count, 368 u8 *address, u8 *value) 369{ 370 struct dt9812_usb_cmd cmd; 371 int i, count, retval; 372 373 cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG); 374 cmd.u.read_multi_info.count = reg_count; 375 for (i = 0; i < reg_count; i++) 376 cmd.u.read_multi_info.address[i] = address[i]; 377 378 /* DT9812 only responds to 32 byte writes!! */ 379 count = 32; 380 retval = usb_bulk_msg(dev->udev, 381 usb_sndbulkpipe(dev->udev, 382 dev->command_write.addr), 383 &cmd, 32, &count, HZ * 1); 384 if (retval) 385 return retval; 386 retval = usb_bulk_msg(dev->udev, 387 usb_rcvbulkpipe(dev->udev, 388 dev->command_read.addr), 389 value, reg_count, &count, HZ * 1); 390 return retval; 391} 392 393static int dt9812_write_multiple_registers(struct usb_dt9812 *dev, 394 int reg_count, u8 *address, 395 u8 *value) 396{ 397 struct dt9812_usb_cmd cmd; 398 int i, count, retval; 399 400 cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG); 401 cmd.u.read_multi_info.count = reg_count; 402 for (i = 0; i < reg_count; i++) { 403 cmd.u.write_multi_info.write[i].address = address[i]; 404 cmd.u.write_multi_info.write[i].value = value[i]; 405 } 406 /* DT9812 only responds to 32 byte writes!! */ 407 retval = usb_bulk_msg(dev->udev, 408 usb_sndbulkpipe(dev->udev, 409 dev->command_write.addr), 410 &cmd, 32, &count, HZ * 1); 411 return retval; 412} 413 414static int dt9812_rmw_multiple_registers(struct usb_dt9812 *dev, int reg_count, 415 struct dt9812_rmw_byte *rmw) 416{ 417 struct dt9812_usb_cmd cmd; 418 int i, count, retval; 419 420 cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG); 421 cmd.u.rmw_multi_info.count = reg_count; 422 for (i = 0; i < reg_count; i++) 423 cmd.u.rmw_multi_info.rmw[i] = rmw[i]; 424 425 /* DT9812 only responds to 32 byte writes!! */ 426 retval = usb_bulk_msg(dev->udev, 427 usb_sndbulkpipe(dev->udev, 428 dev->command_write.addr), 429 &cmd, 32, &count, HZ * 1); 430 return retval; 431} 432 433static int dt9812_digital_in(struct slot_dt9812 *slot, u8 *bits) 434{ 435 int result = -ENODEV; 436 437 down(&slot->mutex); 438 if (slot->usb) { 439 u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 }; 440 u8 value[2]; 441 442 result = dt9812_read_multiple_registers(slot->usb, 2, reg, 443 value); 444 if (result == 0) { 445 /* 446 * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital 447 * input port bit 3 in F020_SFR_P1 is bit 7 in the 448 * digital input port 449 */ 450 *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4); 451 /* printk("%2.2x, %2.2x -> %2.2x\n", 452 value[0], value[1], *bits); */ 453 } 454 } 455 up(&slot->mutex); 456 457 return result; 458} 459 460static int dt9812_digital_out(struct slot_dt9812 *slot, u8 bits) 461{ 462 int result = -ENODEV; 463 464 down(&slot->mutex); 465 if (slot->usb) { 466 u8 reg[1]; 467 u8 value[1]; 468 469 reg[0] = F020_SFR_P2; 470 value[0] = bits; 471 result = dt9812_write_multiple_registers(slot->usb, 1, reg, 472 value); 473 slot->usb->digital_out_shadow = bits; 474 } 475 up(&slot->mutex); 476 return result; 477} 478 479static int dt9812_digital_out_shadow(struct slot_dt9812 *slot, u8 *bits) 480{ 481 int result = -ENODEV; 482 483 down(&slot->mutex); 484 if (slot->usb) { 485 *bits = slot->usb->digital_out_shadow; 486 result = 0; 487 } 488 up(&slot->mutex); 489 return result; 490} 491 492static void dt9812_configure_mux(struct usb_dt9812 *dev, 493 struct dt9812_rmw_byte *rmw, int channel) 494{ 495 if (dev->device == DT9812_DEVID_DT9812_10) { 496 /* In the DT9812/10V MUX is selected by P1.5-7 */ 497 rmw->address = F020_SFR_P1; 498 rmw->and_mask = 0xe0; 499 rmw->or_value = channel << 5; 500 } else { 501 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */ 502 rmw->address = F020_SFR_AMX0SL; 503 rmw->and_mask = 0xff; 504 rmw->or_value = channel & 0x07; 505 } 506} 507 508static void dt9812_configure_gain(struct usb_dt9812 *dev, 509 struct dt9812_rmw_byte *rmw, 510 enum dt9812_gain gain) 511{ 512 if (dev->device == DT9812_DEVID_DT9812_10) { 513 /* In the DT9812/10V, there is an external gain of 0.5 */ 514 gain <<= 1; 515 } 516 517 rmw->address = F020_SFR_ADC0CF; 518 rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 | 519 F020_MASK_ADC0CF_AMP0GN1 | 520 F020_MASK_ADC0CF_AMP0GN0; 521 switch (gain) { 522 /* 523 * 000 -> Gain = 1 524 * 001 -> Gain = 2 525 * 010 -> Gain = 4 526 * 011 -> Gain = 8 527 * 10x -> Gain = 16 528 * 11x -> Gain = 0.5 529 */ 530 case DT9812_GAIN_0PT5: 531 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 || 532 F020_MASK_ADC0CF_AMP0GN1; 533 break; 534 case DT9812_GAIN_1: 535 rmw->or_value = 0x00; 536 break; 537 case DT9812_GAIN_2: 538 rmw->or_value = F020_MASK_ADC0CF_AMP0GN0; 539 break; 540 case DT9812_GAIN_4: 541 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1; 542 break; 543 case DT9812_GAIN_8: 544 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 || 545 F020_MASK_ADC0CF_AMP0GN0; 546 break; 547 case DT9812_GAIN_16: 548 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2; 549 break; 550 default: 551 err("Illegal gain %d\n", gain); 552 553 } 554} 555 556static int dt9812_analog_in(struct slot_dt9812 *slot, int channel, u16 *value, 557 enum dt9812_gain gain) 558{ 559 struct dt9812_rmw_byte rmw[3]; 560 u8 reg[3] = { 561 F020_SFR_ADC0CN, 562 F020_SFR_ADC0H, 563 F020_SFR_ADC0L 564 }; 565 u8 val[3]; 566 int result = -ENODEV; 567 568 down(&slot->mutex); 569 if (!slot->usb) 570 goto exit; 571 572 /* 1 select the gain */ 573 dt9812_configure_gain(slot->usb, &rmw[0], gain); 574 575 /* 2 set the MUX to select the channel */ 576 dt9812_configure_mux(slot->usb, &rmw[1], channel); 577 578 /* 3 start conversion */ 579 rmw[2].address = F020_SFR_ADC0CN; 580 rmw[2].and_mask = 0xff; 581 rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY; 582 583 result = dt9812_rmw_multiple_registers(slot->usb, 3, rmw); 584 if (result) 585 goto exit; 586 587 /* read the status and ADC */ 588 result = dt9812_read_multiple_registers(slot->usb, 3, reg, val); 589 if (result) 590 goto exit; 591 /* 592 * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us. 593 * Therefore, between the instant that AD0BUSY was set via 594 * dt9812_rmw_multiple_registers and the read of AD0BUSY via 595 * dt9812_read_multiple_registers, the conversion should be complete 596 * since these two operations require two USB transactions each taking 597 * at least a millisecond to complete. However, lets make sure that 598 * conversion is finished. 599 */ 600 if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) == 601 F020_MASK_ADC0CN_AD0INT) { 602 switch (slot->usb->device) { 603 case DT9812_DEVID_DT9812_10: 604 /* 605 * For DT9812-10V the personality module set the 606 * encoding to 2's complement. Hence, convert it before 607 * returning it 608 */ 609 *value = ((val[1] << 8) | val[2]) + 0x800; 610 break; 611 case DT9812_DEVID_DT9812_2PT5: 612 *value = (val[1] << 8) | val[2]; 613 break; 614 } 615 } 616 617exit: 618 up(&slot->mutex); 619 return result; 620} 621 622static int dt9812_analog_out_shadow(struct slot_dt9812 *slot, int channel, 623 u16 *value) 624{ 625 int result = -ENODEV; 626 627 down(&slot->mutex); 628 if (slot->usb) { 629 *value = slot->usb->analog_out_shadow[channel]; 630 result = 0; 631 } 632 up(&slot->mutex); 633 634 return result; 635} 636 637static int dt9812_analog_out(struct slot_dt9812 *slot, int channel, u16 value) 638{ 639 int result = -ENODEV; 640 641 down(&slot->mutex); 642 if (slot->usb) { 643 struct dt9812_rmw_byte rmw[3]; 644 645 switch (channel) { 646 case 0: 647 /* 1. Set DAC mode */ 648 rmw[0].address = F020_SFR_DAC0CN; 649 rmw[0].and_mask = 0xff; 650 rmw[0].or_value = F020_MASK_DACxCN_DACxEN; 651 652 /* 2 load low byte of DAC value first */ 653 rmw[1].address = F020_SFR_DAC0L; 654 rmw[1].and_mask = 0xff; 655 rmw[1].or_value = value & 0xff; 656 657 /* 3 load high byte of DAC value next to latch the 658 12-bit value */ 659 rmw[2].address = F020_SFR_DAC0H; 660 rmw[2].and_mask = 0xff; 661 rmw[2].or_value = (value >> 8) & 0xf; 662 break; 663 664 case 1: 665 /* 1. Set DAC mode */ 666 rmw[0].address = F020_SFR_DAC1CN; 667 rmw[0].and_mask = 0xff; 668 rmw[0].or_value = F020_MASK_DACxCN_DACxEN; 669 670 /* 2 load low byte of DAC value first */ 671 rmw[1].address = F020_SFR_DAC1L; 672 rmw[1].and_mask = 0xff; 673 rmw[1].or_value = value & 0xff; 674 675 /* 3 load high byte of DAC value next to latch the 676 12-bit value */ 677 rmw[2].address = F020_SFR_DAC1H; 678 rmw[2].and_mask = 0xff; 679 rmw[2].or_value = (value >> 8) & 0xf; 680 break; 681 } 682 result = dt9812_rmw_multiple_registers(slot->usb, 3, rmw); 683 slot->usb->analog_out_shadow[channel] = value; 684 } 685 up(&slot->mutex); 686 687 return result; 688} 689 690/* 691 * USB framework functions 692 */ 693 694static int dt9812_probe(struct usb_interface *interface, 695 const struct usb_device_id *id) 696{ 697 int retval = -ENOMEM; 698 struct usb_dt9812 *dev = NULL; 699 struct usb_host_interface *iface_desc; 700 struct usb_endpoint_descriptor *endpoint; 701 int i; 702 u8 fw; 703 704 /* allocate memory for our device state and initialize it */ 705 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 706 if (dev == NULL) { 707 dev_err(&interface->dev, "Out of memory\n"); 708 goto error; 709 } 710 kref_init(&dev->kref); 711 712 dev->udev = usb_get_dev(interface_to_usbdev(interface)); 713 dev->interface = interface; 714 715 /* Check endpoints */ 716 iface_desc = interface->cur_altsetting; 717 718 if (iface_desc->desc.bNumEndpoints != 5) { 719 err("Wrong number of endpints."); 720 retval = -ENODEV; 721 goto error; 722 } 723 724 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 725 int direction = -1; 726 endpoint = &iface_desc->endpoint[i].desc; 727 switch (i) { 728 case 0: 729 direction = USB_DIR_IN; 730 dev->message_pipe.addr = endpoint->bEndpointAddress; 731 dev->message_pipe.size = 732 le16_to_cpu(endpoint->wMaxPacketSize); 733 734 break; 735 case 1: 736 direction = USB_DIR_OUT; 737 dev->command_write.addr = endpoint->bEndpointAddress; 738 dev->command_write.size = 739 le16_to_cpu(endpoint->wMaxPacketSize); 740 break; 741 case 2: 742 direction = USB_DIR_IN; 743 dev->command_read.addr = endpoint->bEndpointAddress; 744 dev->command_read.size = 745 le16_to_cpu(endpoint->wMaxPacketSize); 746 break; 747 case 3: 748 direction = USB_DIR_OUT; 749 dev->write_stream.addr = endpoint->bEndpointAddress; 750 dev->write_stream.size = 751 le16_to_cpu(endpoint->wMaxPacketSize); 752 break; 753 case 4: 754 direction = USB_DIR_IN; 755 dev->read_stream.addr = endpoint->bEndpointAddress; 756 dev->read_stream.size = 757 le16_to_cpu(endpoint->wMaxPacketSize); 758 break; 759 } 760 if ((endpoint->bEndpointAddress & USB_DIR_IN) != direction) { 761 dev_err(&interface->dev, 762 "Endpoint has wrong direction.\n"); 763 retval = -ENODEV; 764 goto error; 765 } 766 } 767 if (dt9812_read_info(dev, 0, &fw, sizeof(fw)) != 0) { 768 /* 769 * Seems like a configuration reset is necessary if driver is 770 * reloaded while device is attached 771 */ 772 usb_reset_configuration(dev->udev); 773 for (i = 0; i < 10; i++) { 774 retval = dt9812_read_info(dev, 1, &fw, sizeof(fw)); 775 if (retval == 0) { 776 dev_info(&interface->dev, 777 "usb_reset_configuration succeded " 778 "after %d iterations\n", i); 779 break; 780 } 781 } 782 } 783 784 if (dt9812_read_info(dev, 1, &dev->vendor, sizeof(dev->vendor)) != 0) { 785 err("Failed to read vendor."); 786 retval = -ENODEV; 787 goto error; 788 } 789 if (dt9812_read_info(dev, 3, &dev->product, 790 sizeof(dev->product)) != 0) { 791 err("Failed to read product."); 792 retval = -ENODEV; 793 goto error; 794 } 795 if (dt9812_read_info(dev, 5, &dev->device, sizeof(dev->device)) != 0) { 796 err("Failed to read device."); 797 retval = -ENODEV; 798 goto error; 799 } 800 if (dt9812_read_info(dev, 7, &dev->serial, sizeof(dev->serial)) != 0) { 801 err("Failed to read serial."); 802 retval = -ENODEV; 803 goto error; 804 } 805 806 dev->vendor = le16_to_cpu(dev->vendor); 807 dev->product = le16_to_cpu(dev->product); 808 dev->device = le16_to_cpu(dev->device); 809 dev->serial = le32_to_cpu(dev->serial); 810 switch (dev->device) { 811 case DT9812_DEVID_DT9812_10: 812 dev->analog_out_shadow[0] = 0x0800; 813 dev->analog_out_shadow[1] = 0x800; 814 break; 815 case DT9812_DEVID_DT9812_2PT5: 816 dev->analog_out_shadow[0] = 0x0000; 817 dev->analog_out_shadow[1] = 0x0000; 818 break; 819 } 820 dev->digital_out_shadow = 0; 821 822 /* save our data pointer in this interface device */ 823 usb_set_intfdata(interface, dev); 824 825 /* let the user know what node this device is now attached to */ 826 dev_info(&interface->dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n", 827 dev->vendor, dev->product, dev->device, dev->serial); 828 829 down(&dt9812_mutex); 830 { 831 /* Find a slot for the USB device */ 832 struct slot_dt9812 *first = NULL; 833 struct slot_dt9812 *best = NULL; 834 835 for (i = 0; i < DT9812_NUM_SLOTS; i++) { 836 if (!first && !dt9812[i].usb && dt9812[i].serial == 0) 837 first = &dt9812[i]; 838 if (!best && dt9812[i].serial == dev->serial) 839 best = &dt9812[i]; 840 } 841 842 if (!best) 843 best = first; 844 845 if (best) { 846 down(&best->mutex); 847 best->usb = dev; 848 dev->slot = best; 849 up(&best->mutex); 850 } 851 } 852 up(&dt9812_mutex); 853 854 return 0; 855 856error: 857 if (dev) 858 kref_put(&dev->kref, dt9812_delete); 859 return retval; 860} 861 862static void dt9812_disconnect(struct usb_interface *interface) 863{ 864 struct usb_dt9812 *dev; 865 int minor = interface->minor; 866 867 down(&dt9812_mutex); 868 dev = usb_get_intfdata(interface); 869 if (dev->slot) { 870 down(&dev->slot->mutex); 871 dev->slot->usb = NULL; 872 up(&dev->slot->mutex); 873 dev->slot = NULL; 874 } 875 usb_set_intfdata(interface, NULL); 876 up(&dt9812_mutex); 877 878 /* queue final destruction */ 879 kref_put(&dev->kref, dt9812_delete); 880 881 dev_info(&interface->dev, "USB Dt9812 #%d now disconnected\n", minor); 882} 883 884static struct usb_driver dt9812_usb_driver = { 885 .name = "dt9812", 886 .probe = dt9812_probe, 887 .disconnect = dt9812_disconnect, 888 .id_table = dt9812_table, 889}; 890 891/* 892 * Comedi functions 893 */ 894 895static void dt9812_comedi_open(comedi_device *dev) 896{ 897 down(&devpriv->slot->mutex); 898 if (devpriv->slot->usb) { 899 /* We have an attached device, fill in current range info */ 900 comedi_subdevice *s; 901 902 s = &dev->subdevices[0]; 903 s->n_chan = 8; 904 s->maxdata = 1; 905 906 s = &dev->subdevices[1]; 907 s->n_chan = 8; 908 s->maxdata = 1; 909 910 s = &dev->subdevices[2]; 911 s->n_chan = 8; 912 switch (devpriv->slot->usb->device) { 913 case 0:{ 914 s->maxdata = 4095; 915 s->range_table = &dt9812_10_ain_range; 916 } 917 break; 918 case 1:{ 919 s->maxdata = 4095; 920 s->range_table = &dt9812_2pt5_ain_range; 921 } 922 break; 923 } 924 925 s = &dev->subdevices[3]; 926 s->n_chan = 2; 927 switch (devpriv->slot->usb->device) { 928 case 0:{ 929 s->maxdata = 4095; 930 s->range_table = &dt9812_10_aout_range; 931 } 932 break; 933 case 1:{ 934 s->maxdata = 4095; 935 s->range_table = &dt9812_2pt5_aout_range; 936 } 937 break; 938 } 939 } 940 up(&devpriv->slot->mutex); 941} 942 943static int dt9812_di_rinsn(comedi_device *dev, comedi_subdevice *s, 944 comedi_insn *insn, lsampl_t *data) 945{ 946 int n; 947 u8 bits = 0; 948 949 dt9812_digital_in(devpriv->slot, &bits); 950 for (n = 0; n < insn->n; n++) 951 data[n] = ((1 << insn->chanspec) & bits) != 0; 952 return n; 953} 954 955static int dt9812_do_winsn(comedi_device *dev, comedi_subdevice *s, 956 comedi_insn *insn, lsampl_t *data) 957{ 958 int n; 959 u8 bits = 0; 960 961 dt9812_digital_out_shadow(devpriv->slot, &bits); 962 for (n = 0; n < insn->n; n++) { 963 u8 mask = 1 << insn->chanspec; 964 965 bits &= ~mask; 966 if (data[n]) 967 bits |= mask; 968 } 969 dt9812_digital_out(devpriv->slot, bits); 970 return n; 971} 972 973static int dt9812_ai_rinsn(comedi_device *dev, comedi_subdevice *s, 974 comedi_insn *insn, lsampl_t *data) 975{ 976 int n; 977 978 for (n = 0; n < insn->n; n++) { 979 u16 value = 0; 980 981 dt9812_analog_in(devpriv->slot, insn->chanspec, &value, 982 DT9812_GAIN_1); 983 data[n] = value; 984 } 985 return n; 986} 987 988static int dt9812_ao_rinsn(comedi_device *dev, comedi_subdevice *s, 989 comedi_insn *insn, lsampl_t *data) 990{ 991 int n; 992 u16 value; 993 994 for (n = 0; n < insn->n; n++) { 995 value = 0; 996 dt9812_analog_out_shadow(devpriv->slot, insn->chanspec, &value); 997 data[n] = value; 998 } 999 return n; 1000} 1001 1002static int dt9812_ao_winsn(comedi_device *dev, comedi_subdevice *s, 1003 comedi_insn *insn, lsampl_t *data) 1004{ 1005 int n; 1006 1007 for (n = 0; n < insn->n; n++) 1008 dt9812_analog_out(devpriv->slot, insn->chanspec, data[n]); 1009 return n; 1010} 1011 1012static int dt9812_attach(comedi_device *dev, comedi_devconfig *it) 1013{ 1014 int i; 1015 comedi_subdevice *s; 1016 1017 dev->board_name = "dt9812"; 1018 1019 if (alloc_private(dev, sizeof(struct comedi_dt9812)) < 0) 1020 return -ENOMEM; 1021 1022 /* 1023 * Special open routine, since USB unit may be unattached at 1024 * comedi_config time, hence range can not be determined 1025 */ 1026 dev->open = dt9812_comedi_open; 1027 1028 devpriv->serial = it->options[0]; 1029 1030 /* Allocate subdevices */ 1031 if (alloc_subdevices(dev, 4) < 0) 1032 return -ENOMEM; 1033 1034 /* digital input subdevice */ 1035 s = dev->subdevices + 0; 1036 s->type = COMEDI_SUBD_DI; 1037 s->subdev_flags = SDF_READABLE; 1038 s->n_chan = 0; 1039 s->maxdata = 1; 1040 s->range_table = &range_digital; 1041 s->insn_read = &dt9812_di_rinsn; 1042 1043 /* digital output subdevice */ 1044 s = dev->subdevices + 1; 1045 s->type = COMEDI_SUBD_DO; 1046 s->subdev_flags = SDF_WRITEABLE; 1047 s->n_chan = 0; 1048 s->maxdata = 1; 1049 s->range_table = &range_digital; 1050 s->insn_write = &dt9812_do_winsn; 1051 1052 /* analog input subdevice */ 1053 s = dev->subdevices + 2; 1054 s->type = COMEDI_SUBD_AI; 1055 s->subdev_flags = SDF_READABLE | SDF_GROUND; 1056 s->n_chan = 0; 1057 s->maxdata = 1; 1058 s->range_table = NULL; 1059 s->insn_read = &dt9812_ai_rinsn; 1060 1061 /* analog output subdevice */ 1062 s = dev->subdevices + 3; 1063 s->type = COMEDI_SUBD_AO; 1064 s->subdev_flags = SDF_WRITEABLE; 1065 s->n_chan = 0; 1066 s->maxdata = 1; 1067 s->range_table = NULL; 1068 s->insn_write = &dt9812_ao_winsn; 1069 s->insn_read = &dt9812_ao_rinsn; 1070 1071 printk(KERN_INFO "comedi%d: successfully attached to dt9812.\n", 1072 dev->minor); 1073 1074 down(&dt9812_mutex); 1075 /* Find a slot for the comedi device */ 1076 { 1077 struct slot_dt9812 *first = NULL; 1078 struct slot_dt9812 *best = NULL; 1079 for (i = 0; i < DT9812_NUM_SLOTS; i++) { 1080 if (!first && !dt9812[i].comedi) { 1081 /* First free slot from comedi side */ 1082 first = &dt9812[i]; 1083 } 1084 if (!best && 1085 dt9812[i].usb && 1086 dt9812[i].usb->serial == devpriv->serial) { 1087 /* We have an attaced device with matching ID */ 1088 best = &dt9812[i]; 1089 } 1090 } 1091 if (!best) 1092 best = first; 1093 if (best) { 1094 down(&best->mutex); 1095 best->comedi = devpriv; 1096 best->serial = devpriv->serial; 1097 devpriv->slot = best; 1098 up(&best->mutex); 1099 } 1100 } 1101 up(&dt9812_mutex); 1102 1103 return 0; 1104} 1105 1106static int dt9812_detach(comedi_device *dev) 1107{ 1108 return 0; 1109} 1110 1111static comedi_driver dt9812_comedi_driver = { 1112 .module = THIS_MODULE, 1113 .driver_name = "dt9812", 1114 .attach = dt9812_attach, 1115 .detach = dt9812_detach, 1116}; 1117 1118static int __init usb_dt9812_init(void) 1119{ 1120 int result, i; 1121 1122 /* Initialize all driver slots */ 1123 for (i = 0; i < DT9812_NUM_SLOTS; i++) { 1124 init_MUTEX(&dt9812[i].mutex); 1125 dt9812[i].serial = 0; 1126 dt9812[i].usb = NULL; 1127 dt9812[i].comedi = NULL; 1128 } 1129 dt9812[12].serial = 0x0; 1130 1131 /* register with the USB subsystem */ 1132 result = usb_register(&dt9812_usb_driver); 1133 if (result) { 1134 printk(KERN_ERR KBUILD_MODNAME 1135 ": usb_register failed. Error number %d\n", result); 1136 return result; 1137 } 1138 /* register with comedi */ 1139 result = comedi_driver_register(&dt9812_comedi_driver); 1140 if (result) { 1141 usb_deregister(&dt9812_usb_driver); 1142 err("comedi_driver_register failed. Error number %d", result); 1143 } 1144 1145 return result; 1146} 1147 1148static void __exit usb_dt9812_exit(void) 1149{ 1150 /* unregister with comedi */ 1151 comedi_driver_unregister(&dt9812_comedi_driver); 1152 1153 /* deregister this driver with the USB subsystem */ 1154 usb_deregister(&dt9812_usb_driver); 1155} 1156 1157module_init(usb_dt9812_init); 1158module_exit(usb_dt9812_exit); 1159 1160MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>"); 1161MODULE_DESCRIPTION("Comedi DT9812 driver"); 1162MODULE_LICENSE("GPL"); 1163