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
  46 #include "../comedi_usb.h"
  47
  48 #define DT9812_DIAGS_BOARD_INFO_ADDR    0xFBFF
  49 #define DT9812_MAX_WRITE_CMD_PIPE_SIZE  32
  50 #define DT9812_MAX_READ_CMD_PIPE_SIZE   32
  51
  52 /* usb_bulk_msg() timout in milliseconds */
  53 #define DT9812_USB_TIMEOUT              1000
  54
  55 /*
  56  * See Silican Laboratories C8051F020/1/2/3 manual
  57  */
  58 #define F020_SFR_P4                     0x84
  59 #define F020_SFR_P1                     0x90
  60 #define F020_SFR_P2                     0xa0
  61 #define F020_SFR_P3                     0xb0
  62 #define F020_SFR_AMX0CF                 0xba
  63 #define F020_SFR_AMX0SL                 0xbb
  64 #define F020_SFR_ADC0CF                 0xbc
  65 #define F020_SFR_ADC0L                  0xbe
  66 #define F020_SFR_ADC0H                  0xbf
  67 #define F020_SFR_DAC0L                  0xd2
  68 #define F020_SFR_DAC0H                  0xd3
  69 #define F020_SFR_DAC0CN                 0xd4
  70 #define F020_SFR_DAC1L                  0xd5
  71 #define F020_SFR_DAC1H                  0xd6
  72 #define F020_SFR_DAC1CN                 0xd7
  73 #define F020_SFR_ADC0CN                 0xe8
  74
  75 #define F020_MASK_ADC0CF_AMP0GN0        0x01
  76 #define F020_MASK_ADC0CF_AMP0GN1        0x02
  77 #define F020_MASK_ADC0CF_AMP0GN2        0x04
  78
  79 #define F020_MASK_ADC0CN_AD0EN          0x80
  80 #define F020_MASK_ADC0CN_AD0INT         0x20
  81 #define F020_MASK_ADC0CN_AD0BUSY        0x10
  82
  83 #define F020_MASK_DACxCN_DACxEN         0x80
  84
  85 enum {
  86                                         /* A/D  D/A  DI  DO  CT */
  87         DT9812_DEVID_DT9812_10,         /*  8    2   8   8   1  +/- 10V */
  88         DT9812_DEVID_DT9812_2PT5,       /*  8    2   8   8   1  0-2.44V */
  89 };
  90
  91 enum dt9812_gain {
  92         DT9812_GAIN_0PT25 = 1,
  93         DT9812_GAIN_0PT5 = 2,
  94         DT9812_GAIN_1 = 4,
  95         DT9812_GAIN_2 = 8,
  96         DT9812_GAIN_4 = 16,
  97         DT9812_GAIN_8 = 32,
  98         DT9812_GAIN_16 = 64,
  99 };
 100
 101 enum {
 102         DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0,
 103         /* Write Flash memory */
 104         DT9812_W_FLASH_DATA = 0,
 105         /* Read Flash memory misc config info */
 106         DT9812_R_FLASH_DATA = 1,
 107
 108         /*
 109          * Register read/write commands for processor
 110          */
 111
 112         /* Read a single byte of USB memory */
 113         DT9812_R_SINGLE_BYTE_REG = 2,
 114         /* Write a single byte of USB memory */
 115         DT9812_W_SINGLE_BYTE_REG = 3,
 116         /* Multiple Reads of USB memory */
 117         DT9812_R_MULTI_BYTE_REG = 4,
 118         /* Multiple Writes of USB memory */
 119         DT9812_W_MULTI_BYTE_REG = 5,
 120         /* Read, (AND) with mask, OR value, then write (single) */
 121         DT9812_RMW_SINGLE_BYTE_REG = 6,
 122         /* Read, (AND) with mask, OR value, then write (multiple) */
 123         DT9812_RMW_MULTI_BYTE_REG = 7,
 124
 125         /*
 126          * Register read/write commands for SMBus
 127          */
 128
 129         /* Read a single byte of SMBus */
 130         DT9812_R_SINGLE_BYTE_SMBUS = 8,
 131         /* Write a single byte of SMBus */
 132         DT9812_W_SINGLE_BYTE_SMBUS = 9,
 133         /* Multiple Reads of SMBus */
 134         DT9812_R_MULTI_BYTE_SMBUS = 10,
 135         /* Multiple Writes of SMBus */
 136         DT9812_W_MULTI_BYTE_SMBUS = 11,
 137
 138         /*
 139          * Register read/write commands for a device
 140          */
 141
 142         /* Read a single byte of a device */
 143         DT9812_R_SINGLE_BYTE_DEV = 12,
 144         /* Write a single byte of a device */
 145         DT9812_W_SINGLE_BYTE_DEV = 13,
 146         /* Multiple Reads of a device */
 147         DT9812_R_MULTI_BYTE_DEV = 14,
 148         /* Multiple Writes of a device */
 149         DT9812_W_MULTI_BYTE_DEV = 15,
 150
 151         /* Not sure if we'll need this */
 152         DT9812_W_DAC_THRESHOLD = 16,
 153
 154         /* Set interrupt on change mask */
 155         DT9812_W_INT_ON_CHANGE_MASK = 17,
 156
 157         /* Write (or Clear) the CGL for the ADC */
 158         DT9812_W_CGL = 18,
 159         /* Multiple Reads of USB memory */
 160         DT9812_R_MULTI_BYTE_USBMEM = 19,
 161         /* Multiple Writes to USB memory */
 162         DT9812_W_MULTI_BYTE_USBMEM = 20,
 163
 164         /* Issue a start command to a given subsystem */
 165         DT9812_START_SUBSYSTEM = 21,
 166         /* Issue a stop command to a given subsystem */
 167         DT9812_STOP_SUBSYSTEM = 22,
 168
 169         /* calibrate the board using CAL_POT_CMD */
 170         DT9812_CALIBRATE_POT = 23,
 171         /* set the DAC FIFO size */
 172         DT9812_W_DAC_FIFO_SIZE = 24,
 173         /* Write or Clear the CGL for the DAC */
 174         DT9812_W_CGL_DAC = 25,
 175         /* Read a single value from a subsystem */
 176         DT9812_R_SINGLE_VALUE_CMD = 26,
 177         /* Write a single value to a subsystem */
 178         DT9812_W_SINGLE_VALUE_CMD = 27,
 179         /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */
 180         DT9812_MAX_USB_FIRMWARE_CMD_CODE,
 181 };
 182
 183 struct dt9812_flash_data {
 184         __le16 numbytes;
 185         __le16 address;
 186 };
 187
 188 #define DT9812_MAX_NUM_MULTI_BYTE_RDS  \
 189         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8))
 190
 191 struct dt9812_read_multi {
 192         u8 count;
 193         u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS];
 194 };
 195
 196 struct dt9812_write_byte {
 197         u8 address;
 198         u8 value;
 199 };
 200
 201 #define DT9812_MAX_NUM_MULTI_BYTE_WRTS  \
 202         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
 203          sizeof(struct dt9812_write_byte))
 204
 205 struct dt9812_write_multi {
 206         u8 count;
 207         struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS];
 208 };
 209
 210 struct dt9812_rmw_byte {
 211         u8 address;
 212         u8 and_mask;
 213         u8 or_value;
 214 };
 215
 216 #define DT9812_MAX_NUM_MULTI_BYTE_RMWS  \
 217         ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \
 218          sizeof(struct dt9812_rmw_byte))
 219
 220 struct dt9812_rmw_multi {
 221         u8 count;
 222         struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS];
 223 };
 224
 225 struct dt9812_usb_cmd {
 226         __le32 cmd;
 227         union {
 228                 struct dt9812_flash_data flash_data_info;
 229                 struct dt9812_read_multi read_multi_info;
 230                 struct dt9812_write_multi write_multi_info;
 231                 struct dt9812_rmw_multi rmw_multi_info;
 232         } u;
 233 };
 234
 235 struct dt9812_private {
 236         struct semaphore sem;
 237         struct {
 238                 __u8 addr;
 239                 size_t size;
 240         } cmd_wr, cmd_rd;
 241         u16 device;
 242 };
 243
 244 static int dt9812_read_info(struct comedi_device *dev,
 245                             int offset, void *buf, size_t buf_size)
 246 {
 247         struct usb_device *usb = comedi_to_usb_dev(dev);
 248         struct dt9812_private *devpriv = dev->private;
 249         struct dt9812_usb_cmd cmd;
 250         int count, ret;
 251
 252         cmd.cmd = cpu_to_le32(DT9812_R_FLASH_DATA);
 253         cmd.u.flash_data_info.address =
 254             cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset);
 255         cmd.u.flash_data_info.numbytes = cpu_to_le16(buf_size);
 256
 257         /* DT9812 only responds to 32 byte writes!! */
 258         ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 259                            &cmd, 32, &count, DT9812_USB_TIMEOUT);
 260         if (ret)
 261                 return ret;
 262
 263         return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
 264                             buf, buf_size, &count, DT9812_USB_TIMEOUT);
 265 }
 266
 267 static int dt9812_read_multiple_registers(struct comedi_device *dev,
 268                                           int reg_count, u8 *address,
 269                                           u8 *value)
 270 {
 271         struct usb_device *usb = comedi_to_usb_dev(dev);
 272         struct dt9812_private *devpriv = dev->private;
 273         struct dt9812_usb_cmd cmd;
 274         int i, count, ret;
 275
 276         cmd.cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG);
 277         cmd.u.read_multi_info.count = reg_count;
 278         for (i = 0; i < reg_count; i++)
 279                 cmd.u.read_multi_info.address[i] = address[i];
 280
 281         /* DT9812 only responds to 32 byte writes!! */
 282         ret = usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 283                            &cmd, 32, &count, DT9812_USB_TIMEOUT);
 284         if (ret)
 285                 return ret;
 286
 287         return usb_bulk_msg(usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr),
 288                             value, reg_count, &count, DT9812_USB_TIMEOUT);
 289 }
 290
 291 static int dt9812_write_multiple_registers(struct comedi_device *dev,
 292                                            int reg_count, u8 *address,
 293                                            u8 *value)
 294 {
 295         struct usb_device *usb = comedi_to_usb_dev(dev);
 296         struct dt9812_private *devpriv = dev->private;
 297         struct dt9812_usb_cmd cmd;
 298         int i, count;
 299
 300         cmd.cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG);
 301         cmd.u.read_multi_info.count = reg_count;
 302         for (i = 0; i < reg_count; i++) {
 303                 cmd.u.write_multi_info.write[i].address = address[i];
 304                 cmd.u.write_multi_info.write[i].value = value[i];
 305         }
 306
 307         /* DT9812 only responds to 32 byte writes!! */
 308         return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 309                             &cmd, 32, &count, DT9812_USB_TIMEOUT);
 310 }
 311
 312 static int dt9812_rmw_multiple_registers(struct comedi_device *dev,
 313                                          int reg_count,
 314                                          struct dt9812_rmw_byte *rmw)
 315 {
 316         struct usb_device *usb = comedi_to_usb_dev(dev);
 317         struct dt9812_private *devpriv = dev->private;
 318         struct dt9812_usb_cmd cmd;
 319         int i, count;
 320
 321         cmd.cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG);
 322         cmd.u.rmw_multi_info.count = reg_count;
 323         for (i = 0; i < reg_count; i++)
 324                 cmd.u.rmw_multi_info.rmw[i] = rmw[i];
 325
 326         /* DT9812 only responds to 32 byte writes!! */
 327         return usb_bulk_msg(usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr),
 328                             &cmd, 32, &count, DT9812_USB_TIMEOUT);
 329 }
 330
 331 static int dt9812_digital_in(struct comedi_device *dev, u8 *bits)
 332 {
 333         struct dt9812_private *devpriv = dev->private;
 334         u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 };
 335         u8 value[2];
 336         int ret;
 337
 338         down(&devpriv->sem);
 339         ret = dt9812_read_multiple_registers(dev, 2, reg, value);
 340         if (ret == 0) {
 341                 /*
 342                  * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital
 343                  * input port bit 3 in F020_SFR_P1 is bit 7 in the
 344                  * digital input port
 345                  */
 346                 *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4);
 347         }
 348         up(&devpriv->sem);
 349
 350         return ret;
 351 }
 352
 353 static int dt9812_digital_out(struct comedi_device *dev, u8 bits)
 354 {
 355         struct dt9812_private *devpriv = dev->private;
 356         u8 reg[1] = { F020_SFR_P2 };
 357         u8 value[1] = { bits };
 358         int ret;
 359
 360         down(&devpriv->sem);
 361         ret = dt9812_write_multiple_registers(dev, 1, reg, value);
 362         up(&devpriv->sem);
 363
 364         return ret;
 365 }
 366
 367 static void dt9812_configure_mux(struct comedi_device *dev,
 368                                  struct dt9812_rmw_byte *rmw, int channel)
 369 {
 370         struct dt9812_private *devpriv = dev->private;
 371
 372         if (devpriv->device == DT9812_DEVID_DT9812_10) {
 373                 /* In the DT9812/10V MUX is selected by P1.5-7 */
 374                 rmw->address = F020_SFR_P1;
 375                 rmw->and_mask = 0xe0;
 376                 rmw->or_value = channel << 5;
 377         } else {
 378                 /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */
 379                 rmw->address = F020_SFR_AMX0SL;
 380                 rmw->and_mask = 0xff;
 381                 rmw->or_value = channel & 0x07;
 382         }
 383 }
 384
 385 static void dt9812_configure_gain(struct comedi_device *dev,
 386                                   struct dt9812_rmw_byte *rmw,
 387                                   enum dt9812_gain gain)
 388 {
 389         struct dt9812_private *devpriv = dev->private;
 390
 391         /* In the DT9812/10V, there is an external gain of 0.5 */
 392         if (devpriv->device == DT9812_DEVID_DT9812_10)
 393                 gain <<= 1;
 394
 395         rmw->address = F020_SFR_ADC0CF;
 396         rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 |
 397                         F020_MASK_ADC0CF_AMP0GN1 |
 398                         F020_MASK_ADC0CF_AMP0GN0;
 399
 400         switch (gain) {
 401                 /*
 402                  * 000 -> Gain =  1
 403                  * 001 -> Gain =  2
 404                  * 010 -> Gain =  4
 405                  * 011 -> Gain =  8
 406                  * 10x -> Gain = 16
 407                  * 11x -> Gain =  0.5
 408                  */
 409         case DT9812_GAIN_0PT5:
 410                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 |
 411                                 F020_MASK_ADC0CF_AMP0GN1;
 412                 break;
 413         default:
 414                 /* this should never happen, just use a gain of 1 */
 415         case DT9812_GAIN_1:
 416                 rmw->or_value = 0x00;
 417                 break;
 418         case DT9812_GAIN_2:
 419                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN0;
 420                 break;
 421         case DT9812_GAIN_4:
 422                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1;
 423                 break;
 424         case DT9812_GAIN_8:
 425                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 |
 426                                 F020_MASK_ADC0CF_AMP0GN0;
 427                 break;
 428         case DT9812_GAIN_16:
 429                 rmw->or_value = F020_MASK_ADC0CF_AMP0GN2;
 430                 break;
 431         }
 432 }
 433
 434 static int dt9812_analog_in(struct comedi_device *dev,
 435                             int channel, u16 *value, enum dt9812_gain gain)
 436 {
 437         struct dt9812_private *devpriv = dev->private;
 438         struct dt9812_rmw_byte rmw[3];
 439         u8 reg[3] = {
 440                 F020_SFR_ADC0CN,
 441                 F020_SFR_ADC0H,
 442                 F020_SFR_ADC0L
 443         };
 444         u8 val[3];
 445         int ret;
 446
 447         down(&devpriv->sem);
 448
 449         /* 1 select the gain */
 450         dt9812_configure_gain(dev, &rmw[0], gain);
 451
 452         /* 2 set the MUX to select the channel */
 453         dt9812_configure_mux(dev, &rmw[1], channel);
 454
 455         /* 3 start conversion */
 456         rmw[2].address = F020_SFR_ADC0CN;
 457         rmw[2].and_mask = 0xff;
 458         rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY;
 459
 460         ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
 461         if (ret)
 462                 goto exit;
 463
 464         /* read the status and ADC */
 465         ret = dt9812_read_multiple_registers(dev, 3, reg, val);
 466         if (ret)
 467                 goto exit;
 468
 469         /*
 470          * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us.
 471          * Therefore, between the instant that AD0BUSY was set via
 472          * dt9812_rmw_multiple_registers and the read of AD0BUSY via
 473          * dt9812_read_multiple_registers, the conversion should be complete
 474          * since these two operations require two USB transactions each taking
 475          * at least a millisecond to complete.  However, lets make sure that
 476          * conversion is finished.
 477          */
 478         if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) ==
 479             F020_MASK_ADC0CN_AD0INT) {
 480                 switch (devpriv->device) {
 481                 case DT9812_DEVID_DT9812_10:
 482                         /*
 483                          * For DT9812-10V the personality module set the
 484                          * encoding to 2's complement. Hence, convert it before
 485                          * returning it
 486                          */
 487                         *value = ((val[1] << 8) | val[2]) + 0x800;
 488                         break;
 489                 case DT9812_DEVID_DT9812_2PT5:
 490                         *value = (val[1] << 8) | val[2];
 491                         break;
 492                 }
 493         }
 494
 495 exit:
 496         up(&devpriv->sem);
 497
 498         return ret;
 499 }
 500
 501 static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value)
 502 {
 503         struct dt9812_private *devpriv = dev->private;
 504         struct dt9812_rmw_byte rmw[3];
 505         int ret;
 506
 507         down(&devpriv->sem);
 508
 509         switch (channel) {
 510         case 0:
 511                 /* 1. Set DAC mode */
 512                 rmw[0].address = F020_SFR_DAC0CN;
 513                 rmw[0].and_mask = 0xff;
 514                 rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
 515
 516                 /* 2 load low byte of DAC value first */
 517                 rmw[1].address = F020_SFR_DAC0L;
 518                 rmw[1].and_mask = 0xff;
 519                 rmw[1].or_value = value & 0xff;
 520
 521                 /* 3 load high byte of DAC value next to latch the
 522                         12-bit value */
 523                 rmw[2].address = F020_SFR_DAC0H;
 524                 rmw[2].and_mask = 0xff;
 525                 rmw[2].or_value = (value >> 8) & 0xf;
 526                 break;
 527
 528         case 1:
 529                 /* 1. Set DAC mode */
 530                 rmw[0].address = F020_SFR_DAC1CN;
 531                 rmw[0].and_mask = 0xff;
 532                 rmw[0].or_value = F020_MASK_DACxCN_DACxEN;
 533
 534                 /* 2 load low byte of DAC value first */
 535                 rmw[1].address = F020_SFR_DAC1L;
 536                 rmw[1].and_mask = 0xff;
 537                 rmw[1].or_value = value & 0xff;
 538
 539                 /* 3 load high byte of DAC value next to latch the
 540                         12-bit value */
 541                 rmw[2].address = F020_SFR_DAC1H;
 542                 rmw[2].and_mask = 0xff;
 543                 rmw[2].or_value = (value >> 8) & 0xf;
 544                 break;
 545         }
 546         ret = dt9812_rmw_multiple_registers(dev, 3, rmw);
 547
 548         up(&devpriv->sem);
 549
 550         return ret;
 551 }
 552
 553 static int dt9812_di_insn_bits(struct comedi_device *dev,
 554                                struct comedi_subdevice *s,
 555                                struct comedi_insn *insn,
 556                                unsigned int *data)
 557 {
 558         u8 bits = 0;
 559         int ret;
 560
 561         ret = dt9812_digital_in(dev, &bits);
 562         if (ret)
 563                 return ret;
 564
 565         data[1] = bits;
 566
 567         return insn->n;
 568 }
 569
 570 static int dt9812_do_insn_bits(struct comedi_device *dev,
 571                                struct comedi_subdevice *s,
 572                                struct comedi_insn *insn,
 573                                unsigned int *data)
 574 {
 575         if (comedi_dio_update_state(s, data))
 576                 dt9812_digital_out(dev, s->state);
 577
 578         data[1] = s->state;
 579
 580         return insn->n;
 581 }
 582
 583 static int dt9812_ai_insn_read(struct comedi_device *dev,
 584                                struct comedi_subdevice *s,
 585                                struct comedi_insn *insn,
 586                                unsigned int *data)
 587 {
 588         unsigned int chan = CR_CHAN(insn->chanspec);
 589         u16 val = 0;
 590         int ret;
 591         int i;
 592
 593         for (i = 0; i < insn->n; i++) {
 594                 ret = dt9812_analog_in(dev, chan, &val, DT9812_GAIN_1);
 595                 if (ret)
 596                         return ret;
 597                 data[i] = val;
 598         }
 599
 600         return insn->n;
 601 }
 602
 603 static int dt9812_ao_insn_read(struct comedi_device *dev,
 604                                struct comedi_subdevice *s,
 605                                struct comedi_insn *insn,
 606                                unsigned int *data)
 607 {
 608         struct dt9812_private *devpriv = dev->private;
 609         int ret;
 610
 611         down(&devpriv->sem);
 612         ret = comedi_readback_insn_read(dev, s, insn, data);
 613         up(&devpriv->sem);
 614
 615         return ret;
 616 }
 617
 618 static int dt9812_ao_insn_write(struct comedi_device *dev,
 619                                 struct comedi_subdevice *s,
 620                                 struct comedi_insn *insn,
 621                                 unsigned int *data)
 622 {
 623         unsigned int chan = CR_CHAN(insn->chanspec);
 624         int i;
 625
 626         for (i = 0; i < insn->n; i++) {
 627                 unsigned int val = data[i];
 628                 int ret;
 629
 630                 ret = dt9812_analog_out(dev, chan, val);
 631                 if (ret)
 632                         return ret;
 633
 634                 s->readback[chan] = val;
 635         }
 636
 637         return insn->n;
 638 }
 639
 640 static int dt9812_find_endpoints(struct comedi_device *dev)
 641 {
 642         struct usb_interface *intf = comedi_to_usb_interface(dev);
 643         struct usb_host_interface *host = intf->cur_altsetting;
 644         struct dt9812_private *devpriv = dev->private;
 645         struct usb_endpoint_descriptor *ep;
 646         int i;
 647
 648         if (host->desc.bNumEndpoints != 5) {
 649                 dev_err(dev->class_dev, "Wrong number of endpoints\n");
 650                 return -ENODEV;
 651         }
 652
 653         for (i = 0; i < host->desc.bNumEndpoints; ++i) {
 654                 int dir = -1;
 655
 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         int i;
 772
 773         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 774         if (!devpriv)
 775                 return -ENOMEM;
 776
 777         sema_init(&devpriv->sem, 1);
 778         usb_set_intfdata(intf, devpriv);
 779
 780         ret = dt9812_find_endpoints(dev);
 781         if (ret)
 782                 return ret;
 783
 784         ret = dt9812_reset_device(dev);
 785         if (ret)
 786                 return ret;
 787
 788         is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5);
 789
 790         ret = comedi_alloc_subdevices(dev, 4);
 791         if (ret)
 792                 return ret;
 793
 794         /* Digital Input subdevice */
 795         s = &dev->subdevices[0];
 796         s->type         = COMEDI_SUBD_DI;
 797         s->subdev_flags = SDF_READABLE;
 798         s->n_chan       = 8;
 799         s->maxdata      = 1;
 800         s->range_table  = &range_digital;
 801         s->insn_bits    = dt9812_di_insn_bits;
 802
 803         /* Digital Output subdevice */
 804         s = &dev->subdevices[1];
 805         s->type         = COMEDI_SUBD_DO;
 806         s->subdev_flags = SDF_WRITABLE;
 807         s->n_chan       = 8;
 808         s->maxdata      = 1;
 809         s->range_table  = &range_digital;
 810         s->insn_bits    = dt9812_do_insn_bits;
 811
 812         /* Analog Input subdevice */
 813         s = &dev->subdevices[2];
 814         s->type         = COMEDI_SUBD_AI;
 815         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 816         s->n_chan       = 8;
 817         s->maxdata      = 0x0fff;
 818         s->range_table  = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
 819         s->insn_read    = dt9812_ai_insn_read;
 820
 821         /* Analog Output subdevice */
 822         s = &dev->subdevices[3];
 823         s->type         = COMEDI_SUBD_AO;
 824         s->subdev_flags = SDF_WRITABLE;
 825         s->n_chan       = 2;
 826         s->maxdata      = 0x0fff;
 827         s->range_table  = is_unipolar ? &range_unipolar2_5 : &range_bipolar10;
 828         s->insn_write   = dt9812_ao_insn_write;
 829         s->insn_read    = dt9812_ao_insn_read;
 830
 831         ret = comedi_alloc_subdev_readback(s);
 832         if (ret)
 833                 return ret;
 834
 835         for (i = 0; i < s->n_chan; i++)
 836                 s->readback[i] = is_unipolar ? 0x0000 : 0x0800;
 837
 838         return 0;
 839 }
 840
 841 static void dt9812_detach(struct comedi_device *dev)
 842 {
 843         struct usb_interface *intf = comedi_to_usb_interface(dev);
 844         struct dt9812_private *devpriv = dev->private;
 845
 846         if (!devpriv)
 847                 return;
 848
 849         down(&devpriv->sem);
 850
 851         usb_set_intfdata(intf, NULL);
 852
 853         up(&devpriv->sem);
 854 }
 855
 856 static struct comedi_driver dt9812_driver = {
 857         .driver_name    = "dt9812",
 858         .module         = THIS_MODULE,
 859         .auto_attach    = dt9812_auto_attach,
 860         .detach         = dt9812_detach,
 861 };
 862
 863 static int dt9812_usb_probe(struct usb_interface *intf,
 864                             const struct usb_device_id *id)
 865 {
 866         return comedi_usb_auto_config(intf, &dt9812_driver, id->driver_info);
 867 }
 868
 869 static const struct usb_device_id dt9812_usb_table[] = {
 870         { USB_DEVICE(0x0867, 0x9812) },
 871         { }
 872 };
 873 MODULE_DEVICE_TABLE(usb, dt9812_usb_table);
 874
 875 static struct usb_driver dt9812_usb_driver = {
 876         .name           = "dt9812",
 877         .id_table       = dt9812_usb_table,
 878         .probe          = dt9812_usb_probe,
 879         .disconnect     = comedi_usb_auto_unconfig,
 880 };
 881 module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver);
 882
 883 MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>");
 884 MODULE_DESCRIPTION("Comedi DT9812 driver");
 885 MODULE_LICENSE("GPL");