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
  20 /*
  21 Driver: dt9812
  22 Description: Data Translation DT9812 USB module
  23 Author: anders.blomdell@control.lth.se (Anders Blomdell)
  24 Status: in development
  25 Devices: [Data Translation] DT9812 (dt9812)
  26 Updated: Sun Nov 20 20:18:34 EST 2005
  27
  28 This driver works, but bulk transfers not implemented. Might be a starting point
  29 for someone else. I found out too late that USB has too high latencies (>1 ms)
  30 for my needs.
  31 */
  32
  33 /*
  34  * Nota Bene:
  35  *   1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?)
  36  *   2. The DDK source (as of sep 2005) is in error regarding the
  37  *      input MUX bits (example code says P4, but firmware schematics
  38  *      says P1).
  39  */
  40
  41 #include <linux/kernel.h>
  42 #include <linux/module.h>
  43 #include <linux/errno.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46
  47 #include "../comedidev.h"
  48
  49 #define DT9812_DIAGS_BOARD_INFO_ADDR    0xFBFF
  50 #define DT9812_MAX_WRITE_CMD_PIPE_SIZE  32
  51 #define DT9812_MAX_READ_CMD_PIPE_SIZE   32
  52
  53 /* usb_bulk_msg() timout in milliseconds */
  54 #define DT9812_USB_TIMEOUT              1000
  55
  56 /*
  57  * See Silican Laboratories C8051F020/1/2/3 manual
  58  */
  59 #define F020_SFR_P4                     0x84
  60 #define F020_SFR_P1                     0x90
  61 #define F020_SFR_P2                     0xa0
  62 #define F020_SFR_P3                     0xb0
  63 #define F020_SFR_AMX0CF                 0xba
  64 #define F020_SFR_AMX0SL                 0xbb
  65 #define F020_SFR_ADC0CF                 0xbc
  66 #define F020_SFR_ADC0L                  0xbe
  67 #define F020_SFR_ADC0H                  0xbf
  68 #define F020_SFR_DAC0L                  0xd2
  69 #define F020_SFR_DAC0H                  0xd3
  70 #define F020_SFR_DAC0CN                 0xd4
  71 #define F020_SFR_DAC1L                  0xd5
  72 #define F020_SFR_DAC1H                  0xd6
  73 #define F020_SFR_DAC1CN                 0xd7
  74 #define F020_SFR_ADC0CN                 0xe8
  75
  76 #define F020_MASK_ADC0CF_AMP0GN0        0x01
  77 #define F020_MASK_ADC0CF_AMP0GN1        0x02
  78 #define F020_MASK_ADC0CF_AMP0GN2        0x04
  79
  80 #define F020_MASK_ADC0CN_AD0EN          0x80
  81 #define F020_MASK_ADC0CN_AD0INT         0x20
  82 #define F020_MASK_ADC0CN_AD0BUSY        0x10
  83
  84 #define F020_MASK_DACxCN_DACxEN         0x80
  85
  86 enum {
  87                                         /* A/D  D/A  DI  DO  CT */
  88         DT9812_DEVID_DT9812_10,         /*  8    2   8   8   1  +/- 10V */
  89         DT9812_DEVID_DT9812_2PT5,       /*  8    2   8   8   1  0-2.44V */
  90 };
  91
  92 enum dt9812_gain {
  93         DT9812_GAIN_0PT25 = 1,
  94         DT9812_GAIN_0PT5 = 2,
  95         DT9812_GAIN_1 = 4,
  96         DT9812_GAIN_2 = 8,
  97         DT9812_GAIN_4 = 16,
  98         DT9812_GAIN_8 = 32,
  99         DT9812_GAIN_16 = 64,
 100 };
 101
 102 enum {
 103         DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0,
 104         /* Write Flash memory */
 105         DT9812_W_FLASH_DATA = 0,
 106         /* Read Flash memory misc config info */
 107         DT9812_R_FLASH_DATA = 1,
 108
 109         /*
 110          * Register read/write commands for processor
 111          */
 112
 113         /* Read a single byte of USB memory */
 114         DT9812_R_SINGLE_BYTE_REG = 2,
 115         /* Write a single byte of USB memory */
 116         DT9812_W_SINGLE_BYTE_REG = 3,
 117         /* Multiple Reads of USB memory */
 118         DT9812_R_MULTI_BYTE_REG = 4,
 119         /* Multiple Writes of USB memory */
 120         DT9812_W_MULTI_BYTE_REG = 5,
 121         /* Read, (AND) with mask, OR value, then write (single) */
 122         DT9812_RMW_SINGLE_BYTE_REG = 6,
 123         /* Read, (AND) with mask, OR value, then write (multiple) */
 124         DT9812_RMW_MULTI_BYTE_REG = 7,
 125
 126         /*
 127          * Register read/write commands for SMBus
 128          */
 129
 130         /* Read a single byte of SMBus */
 131         DT9812_R_SINGLE_BYTE_SMBUS = 8,
 132         /* Write a single byte of SMBus */
 133         DT9812_W_SINGLE_BYTE_SMBUS = 9,
 134         /* Multiple Reads of SMBus */
 135         DT9812_R_MULTI_BYTE_SMBUS = 10,
 136         /* Multiple Writes of SMBus */
 137         DT9812_W_MULTI_BYTE_SMBUS = 11,
 138
 139         /*
 140          * Register read/write commands for a device
 141          */
 142
 143         /* Read a single byte of a device */
 144         DT9812_R_SINGLE_BYTE_DEV = 12,
 145         /* Write a single byte of a device */
 146         DT9812_W_SINGLE_BYTE_DEV = 13,
 147         /* Multiple Reads of a device */
 148         DT9812_R_MULTI_BYTE_DEV = 14,
 149         /* Multiple Writes of a device */
 150         DT9812_W_MULTI_BYTE_DEV = 15,
 151
 152         /* Not sure if we'll need this */
 153         DT9812_W_DAC_THRESHOLD = 16,
 154
 155         /* Set interrupt on change mask */
 156         DT9812_W_INT_ON_CHANGE_MASK = 17,
 157
 158         /* Write (or Clear) the CGL for the ADC */
 159         DT9812_W_CGL = 18,
 160         /* Multiple Reads of USB memory */
 161         DT9812_R_MULTI_BYTE_USBMEM = 19,
 162         /* Multiple Writes to USB memory */
 163         DT9812_W_MULTI_BYTE_USBMEM = 20,
 164
 165         /* Issue a start command to a given subsystem */
 166         DT9812_START_SUBSYSTEM = 21,
 167         /* Issue a stop command to a given subsystem */
 168         DT9812_STOP_SUBSYSTEM = 22,
 169
 170         /* calibrate the board using CAL_POT_CMD */
 171         DT9812_CALIBRATE_POT = 23,
 172         /* set the DAC FIFO size */
 173         DT9812_W_DAC_FIFO_SIZE = 24,
 174         /* Write or Clear the CGL for the DAC */
 175         DT9812_W_CGL_DAC = 25,
 176         /* Read a single value from a subsystem */
 177         DT9812_R_SINGLE_VALUE_CMD = 26,
 178         /* Write a single value to a subsystem */
 179         DT9812_W_SINGLE_VALUE_CMD = 27,
 180         /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */
 181         DT9812_MAX_USB_FIRMWARE_CMD_CODE,
 182 };
 183
 184 struct dt9812_flash_data {
 185         __le16 numbytes;
 186         __le16 address;
 187 };
 188
 189 #define DT9812_MAX_NUM_MULTI_BYTE_RDS  \
 190         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8))
 191
 192 struct dt9812_read_multi {
 193         u8 count;
 194         u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
 195 };
 196
 197 struct dt9812_write_byte {
 198         u8 address;
 199         u8 value;
 200 };
 201
 202 #define DT9812_MAX_NUM_MULTI_BYTE_WRTS  \
 203         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
 204          sizeof(struct dt9812_write_byte))
 205
 206 struct dt9812_write_multi {
 207         u8 count;
 208         struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
 209 };
 210
 211 struct dt9812_rmw_byte {
 212         u8 address;
 213         u8 and_mask;
 214         u8 or_value;
 215 };
 216
 217 #define DT9812_MAX_NUM_MULTI_BYTE_RMWS  \
 218         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
 219          sizeof(struct dt9812_rmw_byte))
 220
 221 struct dt9812_rmw_multi {
 222         u8 count;
 223         struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
 224 };
 225
 226 struct dt9812_usb_cmd {
 227         __le32 cmd;
 228         union {
 229                 struct dt9812_flash_data flash_data_info;
 230                 struct dt9812_read_multi read_multi_info;
 231                 struct dt9812_write_multi write_multi_info;
 232                 struct dt9812_rmw_multi rmw_multi_info;
 233         } u;
 234 };
 235
 236 struct dt9812_private {
 237         struct semaphore sem;
 238         struct {
 239                 __u8 addr;
 240                 size_t size;
 241         } cmd_wr, cmd_rd;
 242         u16 device;
 243         u16 ao_shadow[2];
 244 };
 245
 246 static int dt9812_read_info(struct comedi_device *dev,
 247                             int offset, void *buf, size_t buf_size)
 248 {
 249         struct usb_device *usb = comedi_to_usb_dev(dev);
 250         struct dt9812_private *devpriv = dev->private;
 251         struct dt9812_usb_cmd cmd;
 252         int count, ret;
 253
 254         cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
 255         cmd.u.flash_data_info.address =
 256             cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
 257         cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
 258
 259         /* DT9812 only responds to 32 byte writes!! */
 260         ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 261                            &cmd, 32, &count, DT9812_USB_TIMEOUT);
 262         if (ret)
 263                 return ret;
 264
 265         return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
 266                             buf, buf_size, &count, DT9812_USB_TIMEOUT);
 267 }
 268
 269 static int dt9812_read_multiple_registers(struct comedi_device *dev,
 270                                           int reg_count, u8 *address,
 271                                           u8 *value)
 272 {
 273         struct usb_device *usb = comedi_to_usb_dev(dev);
 274         struct dt9812_private *devpriv = dev->private;
 275         struct dt9812_usb_cmd cmd;
 276         int i, count, ret;
 277
 278         cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
 279         cmd.u.read_multi_info.count = reg_count;
 280         for (i = 0; i < reg_count; i++)
 281                 cmd.u.read_multi_info.address[i] = address[i];
 282
 283         /* DT9812 only responds to 32 byte writes!! */
 284         ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 285                            &cmd, 32, &count, DT9812_USB_TIMEOUT);
 286         if (ret)
 287                 return ret;
 288
 289         return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
 290                             value, reg_count, &count, DT9812_USB_TIMEOUT);
 291 }
 292
 293 static int dt9812_write_multiple_registers(struct comedi_device *dev,
 294                                            int reg_count, u8 *address,
 295                                            u8 *value)
 296 {
 297         struct usb_device *usb = comedi_to_usb_dev(dev);
 298         struct dt9812_private *devpriv = dev->private;
 299         struct dt9812_usb_cmd cmd;
 300         int i, count;
 301
 302         cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
 303         cmd.u.read_multi_info.count = reg_count;
 304         for (i = 0; i < reg_count; i++) {
 305                 cmd.u.write_multi_info.write[i].address = address[i];
 306                 cmd.u.write_multi_info.write[i].value = value[i];
 307         }
 308
 309         /* DT9812 only responds to 32 byte writes!! */
 310         return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 311                             &cmd, 32, &count, DT9812_USB_TIMEOUT);
 312 }
 313
 314 static int dt9812_rmw_multiple_registers(struct comedi_device *dev,
 315                                          int reg_count,
 316                                          struct dt9812_rmw_byte *rmw)
 317 {
 318         struct usb_device *usb = comedi_to_usb_dev(dev);
 319         struct dt9812_private *devpriv = dev->private;
 320         struct dt9812_usb_cmd cmd;
 321         int i, count;
 322
 323         cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
 324         cmd.u.rmw_multi_info.count = reg_count;
 325         for (i = 0; i < reg_count; i++)
 326                 cmd.u.rmw_multi_info.rmw[i] = rmw[i];
 327
 328         /* DT9812 only responds to 32 byte writes!! */
 329         return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 330                             &cmd, 32, &count, DT9812_USB_TIMEOUT);
 331 }
 332
 333 static int dt9812_digital_in(struct comedi_device *dev, u8 *bits)
 334 {
 335         struct dt9812_private *devpriv = dev->private;
 336         u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
 337         u8 value[2];
 338         int ret;
 339
 340         down(&devpriv->sem);
 341         ret = dt9812_read_multiple_registers(dev, 2, reg, value);
 342         if (ret == 0) {
 343                 /*
 344                  * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital
 345                  * input port bit 3 in F020_SFR_P1 is bit 7 in the
 346                  * digital input port
 347                  */
 348                 *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
 349         }
 350         up(&devpriv->sem);
 351
 352         return ret;
 353 }
 354
 355 static int dt9812_digital_out(struct comedi_device *dev, u8 bits)
 356 {
 357         struct dt9812_private *devpriv = dev->private;
 358         u8 reg[1] = { F020_SFR_P2 };
 359         u8 value[1] = { bits };
 360         int ret;
 361
 362         down(&devpriv->sem);
 363         ret = dt9812_write_multiple_registers(dev, 1, reg, value);
 364         up(&devpriv->sem);
 365
 366         return ret;
 367 }
 368
 369 static void dt9812_configure_mux(struct comedi_device *dev,
 370                                  struct dt9812_rmw_byte *rmw, int channel)
 371 {
 372         struct dt9812_private *devpriv = dev->private;
 373
 374         if (devpriv->device == DT9812_DEVID_DT9812_10) {
 375                 /* In the DT9812/10V MUX is selected by P1.5-7 */
 376                 rmw->address = F020_SFR_P1;
 377                 rmw->and_mask = 0xe0;
 378                 rmw->or_value = channel << 5;
 379         } else {
 380                 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */
 381                 rmw->address = F020_SFR_AMX0SL;
 382                 rmw->and_mask = 0xff;
 383                 rmw->or_value = channel & 0x07;
 384         }
 385 }
 386
 387 static void dt9812_configure_gain(struct comedi_device *dev,
 388                                   struct dt9812_rmw_byte *rmw,
 389                                   enum dt9812_gain gain)
 390 {
 391         struct dt9812_private *devpriv = dev->private;
 392
 393         /* In the DT9812/10V, there is an external gain of 0.5 */
 394         if (devpriv->device == DT9812_DEVID_DT9812_10)
 395                 gain <<= 1;
 396
 397         rmw->address = F020_SFR_ADC0CF;
 398         rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 |
 399                         F020_MASK_ADC0CF_AMP0GN1 |
 400                         F020_MASK_ADC0CF_AMP0GN0;
 401
 402         switch (gain) {
 403                 /*
 404                  * 000 -> Gain =  1
 405                  * 001 -> Gain =  2
 406                  * 010 -> Gain =  4
 407                  * 011 -> Gain =  8
 408                  * 10x -> Gain = 16
 409                  * 11x -> Gain =  0.5
 410                  */
 411         case DT9812_GAIN_0PT5:
 412                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 |
 413                                 F020_MASK_ADC0CF_AMP0GN1;
 414                 break;
 415         default:
 416                 /* this should never happen, just use a gain of 1 */
 417         case DT9812_GAIN_1:
 418                 rmw->or_value = 0x00;
 419                 break;
 420         case DT9812_GAIN_2:
 421                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN0;
 422                 break;
 423         case DT9812_GAIN_4:
 424                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1;
 425                 break;
 426         case DT9812_GAIN_8:
 427                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 |
 428                                 F020_MASK_ADC0CF_AMP0GN0;
 429                 break;
 430         case DT9812_GAIN_16:
 431                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2;
 432                 break;
 433         }
 434 }
 435
 436 static int dt9812_analog_in(struct comedi_device *dev,
 437                             int channel, u16 *value, enum dt9812_gain gain)
 438 {
 439         struct dt9812_private *devpriv = dev->private;
 440         struct dt9812_rmw_byte rmw[3];
 441         u8 reg[3] = {
 442                 F020_SFR_ADC0CN,
 443                 F020_SFR_ADC0H,
 444                 F020_SFR_ADC0L
 445         };
 446         u8 val[3];
 447         int ret;
 448
 449         down(&devpriv->sem);
 450
 451         /* 1 select the gain */
 452         dt9812_configure_gain(dev, &rmw[0], gain);
 453
 454         /* 2 set the MUX to select the channel */
 455         dt9812_configure_mux(dev, &rmw[1], channel);
 456
 457         /* 3 start conversion */
 458         rmw[2].address = F020_SFR_ADC0CN;
 459         rmw[2].and_mask = 0xff;
 460         rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY;
 461
 462         ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
 463         if (ret)
 464                 goto exit;
 465
 466         /* read the status and ADC */
 467         ret = dt9812_read_multiple_registers(dev, 3, reg, val);
 468         if (ret)
 469                 goto exit;
 470
 471         /*
 472          * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us.
 473          * Therefore, between the instant that AD0BUSY was set via
 474          * dt9812_rmw_multiple_registers and the read of AD0BUSY via
 475          * dt9812_read_multiple_registers, the conversion should be complete
 476          * since these two operations require two USB transactions each taking
 477          * at least a millisecond to complete.  However, lets make sure that
 478          * conversion is finished.
 479          */
 480         if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) ==
 481             F020_MASK_ADC0CN_AD0INT) {
 482                 switch (devpriv->device) {
 483                 case DT9812_DEVID_DT9812_10:
 484                         /*
 485                          * For DT9812-10V the personality module set the
 486                          * encoding to 2's complement. Hence, convert it before
 487                          * returning it
 488                          */
 489                         *value = ((val[1] << 8) | val[2]) + 0x800;
 490                         break;
 491                 case DT9812_DEVID_DT9812_2PT5:
 492                         *value = (val[1] << 8) | val[2];
 493                         break;
 494                 }
 495         }
 496
 497 exit:
 498         up(&devpriv->sem);
 499
 500         return ret;
 501 }
 502
 503 static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value)
 504 {
 505         struct dt9812_private *devpriv = dev->private;
 506         struct dt9812_rmw_byte rmw[3];
 507         int ret;
 508
 509         down(&devpriv->sem);
 510
 511         switch (channel) {
 512         case 0:
 513                 /* 1. Set DAC mode */
 514                 rmw[0].address = F020_SFR_DAC0CN;
 515                 rmw[0].and_mask = 0xff;
 516                 rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
 517
 518                 /* 2 load low byte of DAC value first */
 519                 rmw[1].address = F020_SFR_DAC0L;
 520                 rmw[1].and_mask = 0xff;
 521                 rmw[1].or_value = value & 0xff;
 522
 523                 /* 3 load high byte of DAC value next to latch the
 524                         12-bit value */
 525                 rmw[2].address = F020_SFR_DAC0H;
 526                 rmw[2].and_mask = 0xff;
 527                 rmw[2].or_value = (value >> 8) & 0xf;
 528                 break;
 529
 530         case 1:
 531                 /* 1. Set DAC mode */
 532                 rmw[0].address = F020_SFR_DAC1CN;
 533                 rmw[0].and_mask = 0xff;
 534                 rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
 535
 536                 /* 2 load low byte of DAC value first */
 537                 rmw[1].address = F020_SFR_DAC1L;
 538                 rmw[1].and_mask = 0xff;
 539                 rmw[1].or_value = value & 0xff;
 540
 541                 /* 3 load high byte of DAC value next to latch the
 542                         12-bit value */
 543                 rmw[2].address = F020_SFR_DAC1H;
 544                 rmw[2].and_mask = 0xff;
 545                 rmw[2].or_value = (value >> 8) & 0xf;
 546                 break;
 547         }
 548         ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
 549         devpriv->ao_shadow[channel] = value;
 550
 551         up(&devpriv->sem);
 552
 553         return ret;
 554 }
 555
 556 static int dt9812_di_insn_bits(struct comedi_device *dev,
 557                                struct comedi_subdevice *s,
 558                                struct comedi_insn *insn,
 559                                unsigned int *data)
 560 {
 561         u8 bits = 0;
 562         int ret;
 563
 564         ret = dt9812_digital_in(dev, &bits);
 565         if (ret)
 566                 return ret;
 567
 568         data[1] = bits;
 569
 570         return insn->n;
 571 }
 572
 573 static int dt9812_do_insn_bits(struct comedi_device *dev,
 574                                struct comedi_subdevice *s,
 575                                struct comedi_insn *insn,
 576                                unsigned int *data)
 577 {
 578         if (comedi_dio_update_state(s, data))
 579                 dt9812_digital_out(dev, s->state);
 580
 581         data[1] = s->state;
 582
 583         return insn->n;
 584 }
 585
 586 static int dt9812_ai_insn_read(struct comedi_device *dev,
 587                                struct comedi_subdevice *s,
 588                                struct comedi_insn *insn,
 589                                unsigned int *data)
 590 {
 591         unsigned int chan = CR_CHAN(insn->chanspec);
 592         u16 val = 0;
 593         int ret;
 594         int i;
 595
 596         for (i = 0; i < insn->n; i++) {
 597                 ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1);
 598                 if (ret)
 599                         return ret;
 600                 data[i] = val;
 601         }
 602
 603         return insn->n;
 604 }
 605
 606 static int dt9812_ao_insn_read(struct comedi_device *dev,
 607                                struct comedi_subdevice *s,
 608                                struct comedi_insn *insn,
 609                                unsigned int *data)
 610 {
 611         struct dt9812_private *devpriv = dev->private;
 612         unsigned int chan = CR_CHAN(insn->chanspec);
 613         int i;
 614
 615         down(&devpriv->sem);
 616         for (i = 0; i < insn->n; i++)
 617                 data[i] = devpriv->ao_shadow[chan];
 618         up(&devpriv->sem);
 619
 620         return insn->n;
 621 }
 622
 623 static int dt9812_ao_insn_write(struct comedi_device *dev,
 624                                 struct comedi_subdevice *s,
 625                                 struct comedi_insn *insn,
 626                                 unsigned int *data)
 627 {
 628         unsigned int chan = CR_CHAN(insn->chanspec);
 629         int ret;
 630         int i;
 631
 632         for (i = 0; i < insn->n; i++) {
 633                 ret = dt9812_analog_out(dev, chan, data[i]);
 634                 if (ret)
 635                         return ret;
 636         }
 637
 638         return insn->n;
 639 }
 640
 641 static int dt9812_find_endpoints(struct comedi_device *dev)
 642 {
 643         struct usb_interface *intf = comedi_to_usb_interface(dev);
 644         struct usb_host_interface *host = intf->cur_altsetting;
 645         struct dt9812_private *devpriv = dev->private;
 646         struct usb_endpoint_descriptor *ep;
 647         int i;
 648
 649         if (host->desc.bNumEndpoints != 5) {
 650                 dev_err(dev->class_dev, "Wrong number of endpoints\n");
 651                 return -ENODEV;
 652         }
 653
 654         for (i = 0; i < host->desc.bNumEndpoints; ++i) {
 655                 int dir = -1;
 656                 ep = &host->endpoint[i].desc;
 657                 switch (i) {
 658                 case 0:
 659                         /* unused message pipe */
 660                         dir = USB_DIR_IN;
 661                         break;
 662                 case 1:
 663                         dir = USB_DIR_OUT;
 664                         devpriv->cmd_wr.addr = ep->bEndpointAddress;
 665                         devpriv->cmd_wr.size = le16_to_cpu(ep->wMaxPacketSize);
 666                         break;
 667                 case 2:
 668                         dir = USB_DIR_IN;
 669                         devpriv->cmd_rd.addr = ep->bEndpointAddress;
 670                         devpriv->cmd_rd.size = le16_to_cpu(ep->wMaxPacketSize);
 671                         break;
 672                 case 3:
 673                         /* unused write stream */
 674                         dir = USB_DIR_OUT;
 675                         break;
 676                 case 4:
 677                         /* unused read stream */
 678                         dir = USB_DIR_IN;
 679                         break;
 680                 }
 681                 if ((ep->bEndpointAddress & USB_DIR_IN) != dir) {
 682                         dev_err(dev->class_dev,
 683                                 "Endpoint has wrong direction\n");
 684                         return -ENODEV;
 685                 }
 686         }
 687         return 0;
 688 }
 689
 690 static int dt9812_reset_device(struct comedi_device *dev)
 691 {
 692         struct usb_device *usb = comedi_to_usb_dev(dev);
 693         struct dt9812_private *devpriv = dev->private;
 694         u32 serial;
 695         u16 vendor;
 696         u16 product;
 697         u8 tmp8;
 698         __le16 tmp16;
 699         __le32 tmp32;
 700         int ret;
 701         int i;
 702
 703         ret = dt9812_read_info(dev, 0, &tmp8, sizeof(tmp8));
 704         if (ret) {
 705                 /*
 706                  * Seems like a configuration reset is necessary if driver is
 707                  * reloaded while device is attached
 708                  */
 709                 usb_reset_configuration(usb);
 710                 for (i = 0; i < 10; i++) {
 711                         ret = dt9812_read_info(dev, 1, &tmp8, sizeof(tmp8));
 712                         if (ret == 0)
 713                                 break;
 714                 }
 715                 if (ret) {
 716                         dev_err(dev->class_dev,
 717                                 "unable to reset configuration\n");
 718                         return ret;
 719                 }
 720         }
 721
 722         ret = dt9812_read_info(dev, 1, &tmp16, sizeof(tmp16));
 723         if (ret) {
 724                 dev_err(dev->class_dev, "failed to read vendor id\n");
 725                 return ret;
 726         }
 727         vendor = le16_to_cpu(tmp16);
 728
 729         ret = dt9812_read_info(dev, 3, &tmp16, sizeof(tmp16));
 730         if (ret) {
 731                 dev_err(dev->class_dev, "failed to read product id\n");
 732                 return ret;
 733         }
 734         product = le16_to_cpu(tmp16);
 735
 736         ret = dt9812_read_info(dev, 5, &tmp16, sizeof(tmp16));
 737         if (ret) {
 738                 dev_err(dev->class_dev, "failed to read device id\n");
 739                 return ret;
 740         }
 741         devpriv->device = le16_to_cpu(tmp16);
 742
 743         ret = dt9812_read_info(dev, 7, &tmp32, sizeof(tmp32));
 744         if (ret) {
 745                 dev_err(dev->class_dev, "failed to read serial number\n");
 746                 return ret;
 747         }
 748         serial = le32_to_cpu(tmp32);
 749
 750         /* let the user know what node this device is now attached to */
 751         dev_info(dev->class_dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n",
 752                  vendor, product, devpriv->device, serial);
 753
 754         if (devpriv->device != DT9812_DEVID_DT9812_10 &&
 755             devpriv->device != DT9812_DEVID_DT9812_2PT5) {
 756                 dev_err(dev->class_dev, "Unsupported device!\n");
 757                 return -EINVAL;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int dt9812_auto_attach(struct comedi_device *dev,
 764                               unsigned long context)
 765 {
 766         struct usb_interface *intf = comedi_to_usb_interface(dev);
 767         struct dt9812_private *devpriv;
 768         struct comedi_subdevice *s;
 769         bool is_unipolar;
 770         int ret;
 771
 772         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 773         if (!devpriv)
 774                 return -ENOMEM;
 775
 776         sema_init(&devpriv->sem, 1);
 777         usb_set_intfdata(intf, devpriv);
 778
 779         ret = dt9812_find_endpoints(dev);
 780         if (ret)
 781                 return ret;
 782
 783         ret = dt9812_reset_device(dev);
 784         if (ret)
 785                 return ret;
 786
 787         is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5);
 788
 789         ret = comedi_alloc_subdevices(dev, 4);
 790         if (ret)
 791                 return ret;
 792
 793         /* Digital Input subdevice */
 794         s = &dev->subdevices[0];
 795         s->type         = COMEDI_SUBD_DI;
 796         s->subdev_flags = SDF_READABLE;
 797         s->n_chan       = 8;
 798         s->maxdata      = 1;
 799         s->range_table  = &range_digital;
 800         s->insn_bits    = dt9812_di_insn_bits;
 801
 802         /* Digital Output subdevice */
 803         s = &dev->subdevices[1];
 804         s->type         = COMEDI_SUBD_DO;
 805         s->subdev_flags = SDF_WRITEABLE;
 806         s->n_chan       = 8;
 807         s->maxdata      = 1;
 808         s->range_table  = &range_digital;
 809         s->insn_bits    = dt9812_do_insn_bits;
 810
 811         /* Analog Input subdevice */
 812         s = &dev->subdevices[2];
 813         s->type         = COMEDI_SUBD_AI;
 814         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 815         s->n_chan       = 8;
 816         s->maxdata      = 0x0fff;
 817         s->range_table  = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
 818         s->insn_read    = dt9812_ai_insn_read;
 819
 820         /* Analog Output subdevice */
 821         s = &dev->subdevices[3];
 822         s->type         = COMEDI_SUBD_AO;
 823         s->subdev_flags = SDF_WRITEABLE;
 824         s->n_chan       = 2;
 825         s->maxdata      = 0x0fff;
 826         s->range_table  = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
 827         s->insn_write   = dt9812_ao_insn_write;
 828         s->insn_read    = dt9812_ao_insn_read;
 829
 830         devpriv->ao_shadow[0] = is_unipolar ? 0x0000 : 0x0800;
 831         devpriv->ao_shadow[1] = is_unipolar ? 0x0000 : 0x0800;
 832
 833         return 0;
 834 }
 835
 836 static void dt9812_detach(struct comedi_device *dev)
 837 {
 838         struct usb_interface *intf = comedi_to_usb_interface(dev);
 839         struct dt9812_private *devpriv = dev->private;
 840
 841         if (!devpriv)
 842                 return;
 843
 844         down(&devpriv->sem);
 845
 846         usb_set_intfdata(intf, NULL);
 847
 848         up(&devpriv->sem);
 849 }
 850
 851 static struct comedi_driver dt9812_driver = {
 852         .driver_name    = "dt9812",
 853         .module         = THIS_MODULE,
 854         .auto_attach    = dt9812_auto_attach,
 855         .detach         = dt9812_detach,
 856 };
 857
 858 static int dt9812_usb_probe(struct usb_interface *intf,
 859                             const struct usb_device_id *id)
 860 {
 861         return comedi_usb_auto_config(intf, &dt9812_driver, id->driver_info);
 862 }
 863
 864 static const struct usb_device_id dt9812_usb_table[] = {
 865         { USB_DEVICE(0x0867, 0x9812) },
 866         { }
 867 };
 868 MODULE_DEVICE_TABLE(usb, dt9812_usb_table);
 869
 870 static struct usb_driver dt9812_usb_driver = {
 871         .name           = "dt9812",
 872         .id_table       = dt9812_usb_table,
 873         .probe          = dt9812_usb_probe,
 874         .disconnect     = comedi_usb_auto_unconfig,
 875 };
 876 module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver);
 877
 878 MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
 879 MODULE_DESCRIPTION("Comedi DT9812 driver");
 880 MODULE_LICENSE("GPL");