drivers/staging/comedi/drivers/dt9812.c

   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 /*
  26 Driver: dt9812
  27 Description: Data Translation DT9812 USB module
  28 Author: anders.blomdell@control.lth.se (Anders Blomdell)
  29 Status: in development
  30 Devices: [Data Translation] DT9812 (dt9812)
  31 Updated: Sun Nov 20 20:18:34 EST 2005
  32
  33 This driver works, but bulk transfers not implemented. Might be a starting point
  34 for someone else. I found out too late that USB has too high latencies (>1 ms)
  35 for 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
  91 enum {
  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
 101 enum 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
 111 enum {
 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
 193 struct 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
 201 struct dt9812_read_multi {
 202         u8 count;
 203         u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
 204 };
 205
 206 struct 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
 215 struct dt9812_write_multi {
 216         u8 count;
 217         struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
 218 };
 219
 220 struct 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) / \
 228          sizeof(struct dt9812_rmw_byte))
 229
 230 struct dt9812_rmw_multi {
 231         u8 count;
 232         struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
 233 };
 234
 235 struct dt9812_usb_cmd {
 236         u32 cmd;
 237         union {
 238                 struct dt9812_flash_data flash_data_info;
 239                 struct dt9812_read_multi read_multi_info;
 240                 struct dt9812_write_multi write_multi_info;
 241                 struct dt9812_rmw_multi rmw_multi_info;
 242         } u;
 243 #if 0
 244         WRITE_BYTE_INFO WriteByteInfo;
 245         READ_BYTE_INFO ReadByteInfo;
 246         WRITE_MULTI_INFO WriteMultiInfo;
 247         READ_MULTI_INFO ReadMultiInfo;
 248         RMW_BYTE_INFO RMWByteInfo;
 249         RMW_MULTI_INFO RMWMultiInfo;
 250         DAC_THRESHOLD_INFO DacThresholdInfo;
 251         INT_ON_CHANGE_MASK_INFO IntOnChangeMaskInfo;
 252         CGL_INFO CglInfo;
 253         SUBSYSTEM_INFO SubsystemInfo;
 254         CAL_POT_CMD CalPotCmd;
 255         WRITE_DEV_BYTE_INFO WriteDevByteInfo;
 256         READ_DEV_BYTE_INFO ReadDevByteInfo;
 257         WRITE_DEV_MULTI_INFO WriteDevMultiInfo;
 258         READ_DEV_MULTI_INFO ReadDevMultiInfo;
 259         READ_SINGLE_VALUE_INFO ReadSingleValueInfo;
 260         WRITE_SINGLE_VALUE_INFO WriteSingleValueInfo;
 261 #endif
 262 };
 263
 264 #define DT9812_NUM_SLOTS        16
 265
 266 static DEFINE_SEMAPHORE(dt9812_mutex);
 267
 268 static const struct usb_device_id dt9812_table[] = {
 269         {USB_DEVICE(0x0867, 0x9812)},
 270         {}                      /* Terminating entry */
 271 };
 272
 273 MODULE_DEVICE_TABLE(usb, dt9812_table);
 274
 275 struct usb_dt9812 {
 276         struct slot_dt9812 *slot;
 277         struct usb_device *udev;
 278         struct usb_interface *interface;
 279         u16 vendor;
 280         u16 product;
 281         u16 device;
 282         u32 serial;
 283         struct {
 284                 __u8 addr;
 285                 size_t size;
 286         } message_pipe, command_write, command_read, write_stream, read_stream;
 287         struct kref kref;
 288         u16 analog_out_shadow[2];
 289         u8 digital_out_shadow;
 290 };
 291
 292 struct comedi_dt9812 {
 293         struct slot_dt9812 *slot;
 294         u32 serial;
 295 };
 296
 297 struct slot_dt9812 {
 298         struct semaphore mutex;
 299         u32 serial;
 300         struct usb_dt9812 *usb;
 301         struct comedi_dt9812 *comedi;
 302 };
 303
 304 static const struct comedi_lrange dt9812_10_ain_range = { 1, {
 305                                                               BIP_RANGE(10),
 306                                                               }
 307 };
 308
 309 static const struct comedi_lrange dt9812_2pt5_ain_range = { 1, {
 310                                                                 UNI_RANGE(2.5),
 311                                                                 }
 312 };
 313
 314 static const struct comedi_lrange dt9812_10_aout_range = { 1, {
 315                                                                BIP_RANGE(10),
 316                                                                }
 317 };
 318
 319 static const struct comedi_lrange dt9812_2pt5_aout_range = { 1, {
 320                                                                  UNI_RANGE(2.5),
 321                                                                  }
 322 };
 323
 324 static struct slot_dt9812 dt9812[DT9812_NUM_SLOTS];
 325
 326 /* Useful shorthand access to private data */
 327 #define devpriv ((struct comedi_dt9812 *)dev->private)
 328
 329 static inline struct usb_dt9812 *to_dt9812_dev(struct kref *d)
 330 {
 331         return container_of(d, struct usb_dt9812, kref);
 332 }
 333
 334 static void dt9812_delete(struct kref *kref)
 335 {
 336         struct usb_dt9812 *dev = to_dt9812_dev(kref);
 337
 338         usb_put_dev(dev->udev);
 339         kfree(dev);
 340 }
 341
 342 static int dt9812_read_info(struct usb_dt9812 *dev, int offset, void *buf,
 343                             size_t buf_size)
 344 {
 345         struct dt9812_usb_cmd cmd;
 346         int count, retval;
 347
 348         cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
 349         cmd.u.flash_data_info.address =
 350             cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
 351         cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
 352
 353         /* DT9812 only responds to 32 byte writes!! */
 354         count = 32;
 355         retval = usb_bulk_msg(dev->udev,
 356                               usb_sndbulkpipe(dev->udev,
 357                                               dev->command_write.addr),
 358                               &cmd, 32, &count, HZ * 1);
 359         if (retval)
 360                 return retval;
 361         retval = usb_bulk_msg(dev->udev,
 362                               usb_rcvbulkpipe(dev->udev,
 363                                               dev->command_read.addr),
 364                               buf, buf_size, &count, HZ * 1);
 365         return retval;
 366 }
 367
 368 static int dt9812_read_multiple_registers(struct usb_dt9812 *dev, int reg_count,
 369                                           u8 *address, u8 *value)
 370 {
 371         struct dt9812_usb_cmd cmd;
 372         int i, count, retval;
 373
 374         cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
 375         cmd.u.read_multi_info.count = reg_count;
 376         for (i = 0; i < reg_count; i++)
 377                 cmd.u.read_multi_info.address[i] = address[i];
 378
 379         /* DT9812 only responds to 32 byte writes!! */
 380         count = 32;
 381         retval = usb_bulk_msg(dev->udev,
 382                               usb_sndbulkpipe(dev->udev,
 383                                               dev->command_write.addr),
 384                               &cmd, 32, &count, HZ * 1);
 385         if (retval)
 386                 return retval;
 387         retval = usb_bulk_msg(dev->udev,
 388                               usb_rcvbulkpipe(dev->udev,
 389                                               dev->command_read.addr),
 390                               value, reg_count, &count, HZ * 1);
 391         return retval;
 392 }
 393
 394 static int dt9812_write_multiple_registers(struct usb_dt9812 *dev,
 395                                            int reg_count, u8 *address,
 396                                            u8 *value)
 397 {
 398         struct dt9812_usb_cmd cmd;
 399         int i, count, retval;
 400
 401         cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
 402         cmd.u.read_multi_info.count = reg_count;
 403         for (i = 0; i < reg_count; i++) {
 404                 cmd.u.write_multi_info.write[i].address = address[i];
 405                 cmd.u.write_multi_info.write[i].value = value[i];
 406         }
 407         /* DT9812 only responds to 32 byte writes!! */
 408         retval = usb_bulk_msg(dev->udev,
 409                               usb_sndbulkpipe(dev->udev,
 410                                               dev->command_write.addr),
 411                               &cmd, 32, &count, HZ * 1);
 412         return retval;
 413 }
 414
 415 static int dt9812_rmw_multiple_registers(struct usb_dt9812 *dev, int reg_count,
 416                                          struct dt9812_rmw_byte *rmw)
 417 {
 418         struct dt9812_usb_cmd cmd;
 419         int i, count, retval;
 420
 421         cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
 422         cmd.u.rmw_multi_info.count = reg_count;
 423         for (i = 0; i < reg_count; i++)
 424                 cmd.u.rmw_multi_info.rmw[i] = rmw[i];
 425
 426         /* DT9812 only responds to 32 byte writes!! */
 427         retval = usb_bulk_msg(dev->udev,
 428                               usb_sndbulkpipe(dev->udev,
 429                                               dev->command_write.addr),
 430                               &cmd, 32, &count, HZ * 1);
 431         return retval;
 432 }
 433
 434 static int dt9812_digital_in(struct slot_dt9812 *slot, u8 *bits)
 435 {
 436         int result = -ENODEV;
 437
 438         down(&slot->mutex);
 439         if (slot->usb) {
 440                 u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
 441                 u8 value[2];
 442
 443                 result = dt9812_read_multiple_registers(slot->usb, 2, reg,
 444                                                         value);
 445                 if (result == 0) {
 446                         /*
 447                          * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital
 448                          * input port bit 3 in F020_SFR_P1 is bit 7 in the
 449                          * digital input port
 450                          */
 451                         *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
 452                         /* printk("%2.2x, %2.2x -> %2.2x\n",
 453                            value[0], value[1], *bits); */
 454                 }
 455         }
 456         up(&slot->mutex);
 457
 458         return result;
 459 }
 460
 461 static int dt9812_digital_out(struct slot_dt9812 *slot, u8 bits)
 462 {
 463         int result = -ENODEV;
 464
 465         down(&slot->mutex);
 466         if (slot->usb) {
 467                 u8 reg[1];
 468                 u8 value[1];
 469
 470                 reg[0] = F020_SFR_P2;
 471                 value[0] = bits;
 472                 result = dt9812_write_multiple_registers(slot->usb, 1, reg,
 473                                                          value);
 474                 slot->usb->digital_out_shadow = bits;
 475         }
 476         up(&slot->mutex);
 477         return result;
 478 }
 479
 480 static int dt9812_digital_out_shadow(struct slot_dt9812 *slot, u8 *bits)
 481 {
 482         int result = -ENODEV;
 483
 484         down(&slot->mutex);
 485         if (slot->usb) {
 486                 *bits = slot->usb->digital_out_shadow;
 487                 result = 0;
 488         }
 489         up(&slot->mutex);
 490         return result;
 491 }
 492
 493 static void dt9812_configure_mux(struct usb_dt9812 *dev,
 494                                  struct dt9812_rmw_byte *rmw, int channel)
 495 {
 496         if (dev->device == DT9812_DEVID_DT9812_10) {
 497                 /* In the DT9812/10V MUX is selected by P1.5-7 */
 498                 rmw->address = F020_SFR_P1;
 499                 rmw->and_mask = 0xe0;
 500                 rmw->or_value = channel << 5;
 501         } else {
 502                 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */
 503                 rmw->address = F020_SFR_AMX0SL;
 504                 rmw->and_mask = 0xff;
 505                 rmw->or_value = channel & 0x07;
 506         }
 507 }
 508
 509 static void dt9812_configure_gain(struct usb_dt9812 *dev,
 510                                   struct dt9812_rmw_byte *rmw,
 511                                   enum dt9812_gain gain)
 512 {
 513         if (dev->device == DT9812_DEVID_DT9812_10) {
 514                 /* In the DT9812/10V, there is an external gain of 0.5 */
 515                 gain <<= 1;
 516         }
 517
 518         rmw->address = F020_SFR_ADC0CF;
 519         rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 |
 520             F020_MASK_ADC0CF_AMP0GN1 | 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                 dev_err(&dev->interface->dev, "Illegal gain %d\n", gain);
 552
 553         }
 554 }
 555
 556 static 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
 617 exit:
 618         up(&slot->mutex);
 619         return result;
 620 }
 621
 622 static 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
 637 static 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
 694 static 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                 dev_err(&interface->dev, "Wrong number of endpoints.\n");
 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 succeeded "
 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                 dev_err(&interface->dev, "Failed to read vendor.\n");
 786                 retval = -ENODEV;
 787                 goto error;
 788         }
 789         if (dt9812_read_info(dev, 3, &dev->product, sizeof(dev->product)) != 0) {
 790                 dev_err(&interface->dev, "Failed to read product.\n");
 791                 retval = -ENODEV;
 792                 goto error;
 793         }
 794         if (dt9812_read_info(dev, 5, &dev->device, sizeof(dev->device)) != 0) {
 795                 dev_err(&interface->dev, "Failed to read device.\n");
 796                 retval = -ENODEV;
 797                 goto error;
 798         }
 799         if (dt9812_read_info(dev, 7, &dev->serial, sizeof(dev->serial)) != 0) {
 800                 dev_err(&interface->dev, "Failed to read serial.\n");
 801                 retval = -ENODEV;
 802                 goto error;
 803         }
 804
 805         dev->vendor = le16_to_cpu(dev->vendor);
 806         dev->product = le16_to_cpu(dev->product);
 807         dev->device = le16_to_cpu(dev->device);
 808         dev->serial = le32_to_cpu(dev->serial);
 809         switch (dev->device) {
 810         case DT9812_DEVID_DT9812_10:
 811                 dev->analog_out_shadow[0] = 0x0800;
 812                 dev->analog_out_shadow[1] = 0x800;
 813                 break;
 814         case DT9812_DEVID_DT9812_2PT5:
 815                 dev->analog_out_shadow[0] = 0x0000;
 816                 dev->analog_out_shadow[1] = 0x0000;
 817                 break;
 818         }
 819         dev->digital_out_shadow = 0;
 820
 821         /* save our data pointer in this interface device */
 822         usb_set_intfdata(interface, dev);
 823
 824         /* let the user know what node this device is now attached to */
 825         dev_info(&interface->dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
 826                  dev->vendor, dev->product, dev->device, dev->serial);
 827
 828         down(&dt9812_mutex);
 829         {
 830                 /* Find a slot for the USB device */
 831                 struct slot_dt9812 *first = NULL;
 832                 struct slot_dt9812 *best = NULL;
 833
 834                 for (i = 0; i < DT9812_NUM_SLOTS; i++) {
 835                         if (!first && !dt9812[i].usb && dt9812[i].serial == 0)
 836                                 first = &dt9812[i];
 837                         if (!best && dt9812[i].serial == dev->serial)
 838                                 best = &dt9812[i];
 839                 }
 840
 841                 if (!best)
 842                         best = first;
 843
 844                 if (best) {
 845                         down(&best->mutex);
 846                         best->usb = dev;
 847                         dev->slot = best;
 848                         up(&best->mutex);
 849                 }
 850         }
 851         up(&dt9812_mutex);
 852
 853         return 0;
 854
 855 error:
 856         if (dev)
 857                 kref_put(&dev->kref, dt9812_delete);
 858         return retval;
 859 }
 860
 861 static void dt9812_disconnect(struct usb_interface *interface)
 862 {
 863         struct usb_dt9812 *dev;
 864         int minor = interface->minor;
 865
 866         down(&dt9812_mutex);
 867         dev = usb_get_intfdata(interface);
 868         if (dev->slot) {
 869                 down(&dev->slot->mutex);
 870                 dev->slot->usb = NULL;
 871                 up(&dev->slot->mutex);
 872                 dev->slot = NULL;
 873         }
 874         usb_set_intfdata(interface, NULL);
 875         up(&dt9812_mutex);
 876
 877         /* queue final destruction */
 878         kref_put(&dev->kref, dt9812_delete);
 879
 880         dev_info(&interface->dev, "USB Dt9812 #%d now disconnected\n", minor);
 881 }
 882
 883 static struct usb_driver dt9812_usb_driver = {
 884         .name = "dt9812",
 885         .probe = dt9812_probe,
 886         .disconnect = dt9812_disconnect,
 887         .id_table = dt9812_table,
 888 };
 889
 890 /*
 891  * Comedi functions
 892  */
 893
 894 static int dt9812_comedi_open(struct comedi_device *dev)
 895 {
 896         int result = -ENODEV;
 897
 898         down(&devpriv->slot->mutex);
 899         if (devpriv->slot->usb) {
 900                 /* We have an attached device, fill in current range info */
 901                 struct comedi_subdevice *s;
 902
 903                 s = &dev->subdevices[0];
 904                 s->n_chan = 8;
 905                 s->maxdata = 1;
 906
 907                 s = &dev->subdevices[1];
 908                 s->n_chan = 8;
 909                 s->maxdata = 1;
 910
 911                 s = &dev->subdevices[2];
 912                 s->n_chan = 8;
 913                 switch (devpriv->slot->usb->device) {
 914                 case 0:{
 915                                 s->maxdata = 4095;
 916                                 s->range_table = &dt9812_10_ain_range;
 917                         }
 918                         break;
 919                 case 1:{
 920                                 s->maxdata = 4095;
 921                                 s->range_table = &dt9812_2pt5_ain_range;
 922                         }
 923                         break;
 924                 }
 925
 926                 s = &dev->subdevices[3];
 927                 s->n_chan = 2;
 928                 switch (devpriv->slot->usb->device) {
 929                 case 0:{
 930                                 s->maxdata = 4095;
 931                                 s->range_table = &dt9812_10_aout_range;
 932                         }
 933                         break;
 934                 case 1:{
 935                                 s->maxdata = 4095;
 936                                 s->range_table = &dt9812_2pt5_aout_range;
 937                         }
 938                         break;
 939                 }
 940                 result = 0;
 941         }
 942         up(&devpriv->slot->mutex);
 943         return result;
 944 }
 945
 946 static int dt9812_di_rinsn(struct comedi_device *dev,
 947                            struct comedi_subdevice *s, struct comedi_insn *insn,
 948                            unsigned int *data)
 949 {
 950         int n;
 951         u8 bits = 0;
 952
 953         dt9812_digital_in(devpriv->slot, &bits);
 954         for (n = 0; n < insn->n; n++)
 955                 data[n] = ((1 << insn->chanspec) & bits) != 0;
 956         return n;
 957 }
 958
 959 static int dt9812_do_winsn(struct comedi_device *dev,
 960                            struct comedi_subdevice *s, struct comedi_insn *insn,
 961                            unsigned int *data)
 962 {
 963         int n;
 964         u8 bits = 0;
 965
 966         dt9812_digital_out_shadow(devpriv->slot, &bits);
 967         for (n = 0; n < insn->n; n++) {
 968                 u8 mask = 1 << insn->chanspec;
 969
 970                 bits &= ~mask;
 971                 if (data[n])
 972                         bits |= mask;
 973         }
 974         dt9812_digital_out(devpriv->slot, bits);
 975         return n;
 976 }
 977
 978 static int dt9812_ai_rinsn(struct comedi_device *dev,
 979                            struct comedi_subdevice *s, struct comedi_insn *insn,
 980                            unsigned int *data)
 981 {
 982         int n;
 983
 984         for (n = 0; n < insn->n; n++) {
 985                 u16 value = 0;
 986
 987                 dt9812_analog_in(devpriv->slot, insn->chanspec, &value,
 988                                  DT9812_GAIN_1);
 989                 data[n] = value;
 990         }
 991         return n;
 992 }
 993
 994 static int dt9812_ao_rinsn(struct comedi_device *dev,
 995                            struct comedi_subdevice *s, struct comedi_insn *insn,
 996                            unsigned int *data)
 997 {
 998         int n;
 999         u16 value;
1000
1001         for (n = 0; n < insn->n; n++) {
1002                 value = 0;
1003                 dt9812_analog_out_shadow(devpriv->slot, insn->chanspec, &value);
1004                 data[n] = value;
1005         }
1006         return n;
1007 }
1008
1009 static int dt9812_ao_winsn(struct comedi_device *dev,
1010                            struct comedi_subdevice *s, struct comedi_insn *insn,
1011                            unsigned int *data)
1012 {
1013         int n;
1014
1015         for (n = 0; n < insn->n; n++)
1016                 dt9812_analog_out(devpriv->slot, insn->chanspec, data[n]);
1017         return n;
1018 }
1019
1020 static int dt9812_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1021 {
1022         int i;
1023         struct comedi_subdevice *s;
1024         int ret;
1025
1026         dev->board_name = "dt9812";
1027
1028         if (alloc_private(dev, sizeof(struct comedi_dt9812)) < 0)
1029                 return -ENOMEM;
1030
1031         /*
1032          * Special open routine, since USB unit may be unattached at
1033          * comedi_config time, hence range can not be determined
1034          */
1035         dev->open = dt9812_comedi_open;
1036
1037         devpriv->serial = it->options[0];
1038
1039         ret = comedi_alloc_subdevices(dev, 4);
1040         if (ret)
1041                 return ret;
1042
1043         /* digital input subdevice */
1044         s = &dev->subdevices[0];
1045         s->type = COMEDI_SUBD_DI;
1046         s->subdev_flags = SDF_READABLE;
1047         s->n_chan = 0;
1048         s->maxdata = 1;
1049         s->range_table = &range_digital;
1050         s->insn_read = &dt9812_di_rinsn;
1051
1052         /* digital output subdevice */
1053         s = &dev->subdevices[1];
1054         s->type = COMEDI_SUBD_DO;
1055         s->subdev_flags = SDF_WRITEABLE;
1056         s->n_chan = 0;
1057         s->maxdata = 1;
1058         s->range_table = &range_digital;
1059         s->insn_write = &dt9812_do_winsn;
1060
1061         /* analog input subdevice */
1062         s = &dev->subdevices[2];
1063         s->type = COMEDI_SUBD_AI;
1064         s->subdev_flags = SDF_READABLE | SDF_GROUND;
1065         s->n_chan = 0;
1066         s->maxdata = 1;
1067         s->range_table = NULL;
1068         s->insn_read = &dt9812_ai_rinsn;
1069
1070         /* analog output subdevice */
1071         s = &dev->subdevices[3];
1072         s->type = COMEDI_SUBD_AO;
1073         s->subdev_flags = SDF_WRITEABLE;
1074         s->n_chan = 0;
1075         s->maxdata = 1;
1076         s->range_table = NULL;
1077         s->insn_write = &dt9812_ao_winsn;
1078         s->insn_read = &dt9812_ao_rinsn;
1079
1080         printk(KERN_INFO "comedi%d: successfully attached to dt9812.\n",
1081                dev->minor);
1082
1083         down(&dt9812_mutex);
1084         /* Find a slot for the comedi device */
1085         {
1086                 struct slot_dt9812 *first = NULL;
1087                 struct slot_dt9812 *best = NULL;
1088                 for (i = 0; i < DT9812_NUM_SLOTS; i++) {
1089                         if (!first && !dt9812[i].comedi) {
1090                                 /* First free slot from comedi side */
1091                                 first = &dt9812[i];
1092                         }
1093                         if (!best &&
1094                             dt9812[i].usb &&
1095                             dt9812[i].usb->serial == devpriv->serial) {
1096                                 /* We have an attaced device with matching ID */
1097                                 best = &dt9812[i];
1098                         }
1099                 }
1100                 if (!best)
1101                         best = first;
1102                 if (best) {
1103                         down(&best->mutex);
1104                         best->comedi = devpriv;
1105                         best->serial = devpriv->serial;
1106                         devpriv->slot = best;
1107                         up(&best->mutex);
1108                 }
1109         }
1110         up(&dt9812_mutex);
1111
1112         return 0;
1113 }
1114
1115 static void dt9812_detach(struct comedi_device *dev)
1116 {
1117         /* Nothing to cleanup */
1118 }
1119
1120 static struct comedi_driver dt9812_comedi_driver = {
1121         .module = THIS_MODULE,
1122         .driver_name = "dt9812",
1123         .attach = dt9812_attach,
1124         .detach = dt9812_detach,
1125 };
1126
1127 static int __init usb_dt9812_init(void)
1128 {
1129         int result, i;
1130
1131         /* Initialize all driver slots */
1132         for (i = 0; i < DT9812_NUM_SLOTS; i++) {
1133                 sema_init(&dt9812[i].mutex, 1);
1134                 dt9812[i].serial = 0;
1135                 dt9812[i].usb = NULL;
1136                 dt9812[i].comedi = NULL;
1137         }
1138         dt9812[12].serial = 0x0;
1139
1140         /* register with the USB subsystem */
1141         result = usb_register(&dt9812_usb_driver);
1142         if (result) {
1143                 printk(KERN_ERR KBUILD_MODNAME
1144                        ": usb_register failed. Error number %d\n", result);
1145                 return result;
1146         }
1147         /* register with comedi */
1148         result = comedi_driver_register(&dt9812_comedi_driver);
1149         if (result) {
1150                 usb_deregister(&dt9812_usb_driver);
1151                 printk(KERN_ERR KBUILD_MODNAME
1152                         ": comedi_driver_register failed. Error number %d\n",
1153                         result);
1154         }
1155
1156         return result;
1157 }
1158
1159 static void __exit usb_dt9812_exit(void)
1160 {
1161         /* unregister with comedi */
1162         comedi_driver_unregister(&dt9812_comedi_driver);
1163
1164         /* deregister this driver with the USB subsystem */
1165         usb_deregister(&dt9812_usb_driver);
1166 }
1167
1168 module_init(usb_dt9812_init);
1169 module_exit(usb_dt9812_exit);
1170
1171 MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
1172 MODULE_DESCRIPTION("Comedi DT9812 driver");
1173 MODULE_LICENSE("GPL");