drivers/staging/comedi/drivers/usbduxsigma.c

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This source file includes following definitions.
usbduxsigma_unlink_urbs
usbduxsigma_ai_stop
usbduxsigma_ai_cancel
usbduxsigma_ai_handle_urb
usbduxsigma_ai_urb_complete
usbduxsigma_ao_stop
usbduxsigma_ao_cancel
usbduxsigma_ao_handle_urb
usbduxsigma_ao_urb_complete
usbduxsigma_submit_urbs
usbduxsigma_chans_to_interval
usbduxsigma_ai_cmdtest
create_adc_command
usbbuxsigma_send_cmd
usbduxsigma_receive_cmd
usbduxsigma_ai_inttrig
usbduxsigma_ai_cmd
usbduxsigma_ai_insn_read
usbduxsigma_ao_insn_read
usbduxsigma_ao_insn_write
usbduxsigma_ao_inttrig
usbduxsigma_ao_cmdtest
usbduxsigma_ao_cmd
usbduxsigma_dio_insn_config
usbduxsigma_dio_insn_bits
usbduxsigma_pwm_stop
usbduxsigma_pwm_cancel
usbduxsigma_pwm_urb_complete
usbduxsigma_submit_pwm_urb
usbduxsigma_pwm_period
usbduxsigma_pwm_start
usbduxsigma_pwm_pattern
usbduxsigma_pwm_write
usbduxsigma_pwm_config
usbduxsigma_getstatusinfo
usbduxsigma_firmware_upload
usbduxsigma_alloc_usb_buffers
usbduxsigma_free_usb_buffers
usbduxsigma_auto_attach
usbduxsigma_detach
usbduxsigma_usb_probe
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * usbduxsigma.c
   4  * Copyright (C) 2011-2015 Bernd Porr, mail@berndporr.me.uk
   5  */
   6 
   7 /*
   8  * Driver: usbduxsigma
   9  * Description: University of Stirling USB DAQ & INCITE Technology Limited
  10  * Devices: [ITL] USB-DUX-SIGMA (usbduxsigma)
  11  * Author: Bernd Porr <mail@berndporr.me.uk>
  12  * Updated: 20 July 2015
  13  * Status: stable
  14  */
  15 
  16 /*
  17  * I must give credit here to Chris Baugher who
  18  * wrote the driver for AT-MIO-16d. I used some parts of this
  19  * driver. I also must give credits to David Brownell
  20  * who supported me with the USB development.
  21  *
  22  * Note: the raw data from the A/D converter is 24 bit big endian
  23  * anything else is little endian to/from the dux board
  24  *
  25  *
  26  * Revision history:
  27  *   0.1: initial version
  28  *   0.2: all basic functions implemented, digital I/O only for one port
  29  *   0.3: proper vendor ID and driver name
  30  *   0.4: fixed D/A voltage range
  31  *   0.5: various bug fixes, health check at startup
  32  *   0.6: corrected wrong input range
  33  *   0.7: rewrite code that urb->interval is always 1
  34  */
  35 
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/slab.h>
  39 #include <linux/input.h>
  40 #include <linux/fcntl.h>
  41 #include <linux/compiler.h>
  42 #include <asm/unaligned.h>
  43 
  44 #include "../comedi_usb.h"
  45 
  46 /* timeout for the USB-transfer in ms*/
  47 #define BULK_TIMEOUT 1000
  48 
  49 /* constants for "firmware" upload and download */
  50 #define FIRMWARE                "usbduxsigma_firmware.bin"
  51 #define FIRMWARE_MAX_LEN        0x4000
  52 #define USBDUXSUB_FIRMWARE      0xa0
  53 #define VENDOR_DIR_IN           0xc0
  54 #define VENDOR_DIR_OUT          0x40
  55 
  56 /* internal addresses of the 8051 processor */
  57 #define USBDUXSUB_CPUCS 0xE600
  58 
  59 /* 300Hz max frequ under PWM */
  60 #define MIN_PWM_PERIOD  ((long)(1E9 / 300))
  61 
  62 /* Default PWM frequency */
  63 #define PWM_DEFAULT_PERIOD ((long)(1E9 / 100))
  64 
  65 /* Number of channels (16 AD and offset)*/
  66 #define NUMCHANNELS 16
  67 
  68 /* Size of one A/D value */
  69 #define SIZEADIN          ((sizeof(u32)))
  70 
  71 /*
  72  * Size of the async input-buffer IN BYTES, the DIO state is transmitted
  73  * as the first byte.
  74  */
  75 #define SIZEINBUF         (((NUMCHANNELS + 1) * SIZEADIN))
  76 
  77 /* 16 bytes. */
  78 #define SIZEINSNBUF       16
  79 
  80 /* Number of DA channels */
  81 #define NUMOUTCHANNELS    8
  82 
  83 /* size of one value for the D/A converter: channel and value */
  84 #define SIZEDAOUT          ((sizeof(u8) + sizeof(uint16_t)))
  85 
  86 /*
  87  * Size of the output-buffer in bytes
  88  * Actually only the first 4 triplets are used but for the
  89  * high speed mode we need to pad it to 8 (microframes).
  90  */
  91 #define SIZEOUTBUF         ((8 * SIZEDAOUT))
  92 
  93 /*
  94  * Size of the buffer for the dux commands: just now max size is determined
  95  * by the analogue out + command byte + panic bytes...
  96  */
  97 #define SIZEOFDUXBUFFER    ((8 * SIZEDAOUT + 2))
  98 
  99 /* Number of in-URBs which receive the data: min=2 */
 100 #define NUMOFINBUFFERSFULL     5
 101 
 102 /* Number of out-URBs which send the data: min=2 */
 103 #define NUMOFOUTBUFFERSFULL    5
 104 
 105 /* Number of in-URBs which receive the data: min=5 */
 106 /* must have more buffers due to buggy USB ctr */
 107 #define NUMOFINBUFFERSHIGH     10
 108 
 109 /* Number of out-URBs which send the data: min=5 */
 110 /* must have more buffers due to buggy USB ctr */
 111 #define NUMOFOUTBUFFERSHIGH    10
 112 
 113 /* number of retries to get the right dux command */
 114 #define RETRIES 10
 115 
 116 /* bulk transfer commands to usbduxsigma */
 117 #define USBBUXSIGMA_AD_CMD              9
 118 #define USBDUXSIGMA_DA_CMD              1
 119 #define USBDUXSIGMA_DIO_CFG_CMD         2
 120 #define USBDUXSIGMA_DIO_BITS_CMD        3
 121 #define USBDUXSIGMA_SINGLE_AD_CMD       4
 122 #define USBDUXSIGMA_PWM_ON_CMD          7
 123 #define USBDUXSIGMA_PWM_OFF_CMD         8
 124 
 125 static const struct comedi_lrange usbduxsigma_ai_range = {
 126         1, {
 127                 BIP_RANGE(2.5 * 0x800000 / 0x780000 / 2.0)
 128         }
 129 };
 130 
 131 struct usbduxsigma_private {
 132         /* actual number of in-buffers */
 133         int n_ai_urbs;
 134         /* actual number of out-buffers */
 135         int n_ao_urbs;
 136         /* ISO-transfer handling: buffers */
 137         struct urb **ai_urbs;
 138         struct urb **ao_urbs;
 139         /* pwm-transfer handling */
 140         struct urb *pwm_urb;
 141         /* PWM period */
 142         unsigned int pwm_period;
 143         /* PWM internal delay for the GPIF in the FX2 */
 144         u8 pwm_delay;
 145         /* size of the PWM buffer which holds the bit pattern */
 146         int pwm_buf_sz;
 147         /* input buffer for the ISO-transfer */
 148         __be32 *in_buf;
 149         /* input buffer for single insn */
 150         u8 *insn_buf;
 151 
 152         unsigned high_speed:1;
 153         unsigned ai_cmd_running:1;
 154         unsigned ao_cmd_running:1;
 155         unsigned pwm_cmd_running:1;
 156 
 157         /* time between samples in units of the timer */
 158         unsigned int ai_timer;
 159         unsigned int ao_timer;
 160         /* counter between acquisitions */
 161         unsigned int ai_counter;
 162         unsigned int ao_counter;
 163         /* interval in frames/uframes */
 164         unsigned int ai_interval;
 165         /* commands */
 166         u8 *dux_commands;
 167         struct mutex mut;
 168 };
 169 
 170 static void usbduxsigma_unlink_urbs(struct urb **urbs, int num_urbs)
 171 {
 172         int i;
 173 
 174         for (i = 0; i < num_urbs; i++)
 175                 usb_kill_urb(urbs[i]);
 176 }
 177 
 178 static void usbduxsigma_ai_stop(struct comedi_device *dev, int do_unlink)
 179 {
 180         struct usbduxsigma_private *devpriv = dev->private;
 181 
 182         if (do_unlink && devpriv->ai_urbs)
 183                 usbduxsigma_unlink_urbs(devpriv->ai_urbs, devpriv->n_ai_urbs);
 184 
 185         devpriv->ai_cmd_running = 0;
 186 }
 187 
 188 static int usbduxsigma_ai_cancel(struct comedi_device *dev,
 189                                  struct comedi_subdevice *s)
 190 {
 191         struct usbduxsigma_private *devpriv = dev->private;
 192 
 193         mutex_lock(&devpriv->mut);
 194         /* unlink only if it is really running */
 195         usbduxsigma_ai_stop(dev, devpriv->ai_cmd_running);
 196         mutex_unlock(&devpriv->mut);
 197 
 198         return 0;
 199 }
 200 
 201 static void usbduxsigma_ai_handle_urb(struct comedi_device *dev,
 202                                       struct comedi_subdevice *s,
 203                                       struct urb *urb)
 204 {
 205         struct usbduxsigma_private *devpriv = dev->private;
 206         struct comedi_async *async = s->async;
 207         struct comedi_cmd *cmd = &async->cmd;
 208         u32 val;
 209         int ret;
 210         int i;
 211 
 212         if ((urb->actual_length > 0) && (urb->status != -EXDEV)) {
 213                 devpriv->ai_counter--;
 214                 if (devpriv->ai_counter == 0) {
 215                         devpriv->ai_counter = devpriv->ai_timer;
 216 
 217                         /*
 218                          * Get the data from the USB bus and hand it over
 219                          * to comedi. Note, first byte is the DIO state.
 220                          */
 221                         for (i = 0; i < cmd->chanlist_len; i++) {
 222                                 val = be32_to_cpu(devpriv->in_buf[i + 1]);
 223                                 val &= 0x00ffffff; /* strip status byte */
 224                                 val = comedi_offset_munge(s, val);
 225                                 if (!comedi_buf_write_samples(s, &val, 1))
 226                                         return;
 227                         }
 228 
 229                         if (cmd->stop_src == TRIG_COUNT &&
 230                             async->scans_done >= cmd->stop_arg)
 231                                 async->events |= COMEDI_CB_EOA;
 232                 }
 233         }
 234 
 235         /* if command is still running, resubmit urb */
 236         if (!(async->events & COMEDI_CB_CANCEL_MASK)) {
 237                 urb->dev = comedi_to_usb_dev(dev);
 238                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 239                 if (ret < 0) {
 240                         dev_err(dev->class_dev, "urb resubmit failed (%d)\n",
 241                                 ret);
 242                         if (ret == -EL2NSYNC)
 243                                 dev_err(dev->class_dev,
 244                                         "buggy USB host controller or bug in IRQ handler\n");
 245                         async->events |= COMEDI_CB_ERROR;
 246                 }
 247         }
 248 }
 249 
 250 static void usbduxsigma_ai_urb_complete(struct urb *urb)
 251 {
 252         struct comedi_device *dev = urb->context;
 253         struct usbduxsigma_private *devpriv = dev->private;
 254         struct comedi_subdevice *s = dev->read_subdev;
 255         struct comedi_async *async = s->async;
 256 
 257         /* exit if not running a command, do not resubmit urb */
 258         if (!devpriv->ai_cmd_running)
 259                 return;
 260 
 261         switch (urb->status) {
 262         case 0:
 263                 /* copy the result in the transfer buffer */
 264                 memcpy(devpriv->in_buf, urb->transfer_buffer, SIZEINBUF);
 265                 usbduxsigma_ai_handle_urb(dev, s, urb);
 266                 break;
 267 
 268         case -EILSEQ:
 269                 /*
 270                  * error in the ISOchronous data
 271                  * we don't copy the data into the transfer buffer
 272                  * and recycle the last data byte
 273                  */
 274                 dev_dbg(dev->class_dev, "CRC error in ISO IN stream\n");
 275                 usbduxsigma_ai_handle_urb(dev, s, urb);
 276                 break;
 277 
 278         case -ECONNRESET:
 279         case -ENOENT:
 280         case -ESHUTDOWN:
 281         case -ECONNABORTED:
 282                 /* happens after an unlink command */
 283                 async->events |= COMEDI_CB_ERROR;
 284                 break;
 285 
 286         default:
 287                 /* a real error */
 288                 dev_err(dev->class_dev, "non-zero urb status (%d)\n",
 289                         urb->status);
 290                 async->events |= COMEDI_CB_ERROR;
 291                 break;
 292         }
 293 
 294         /*
 295          * comedi_handle_events() cannot be used in this driver. The (*cancel)
 296          * operation would unlink the urb.
 297          */
 298         if (async->events & COMEDI_CB_CANCEL_MASK)
 299                 usbduxsigma_ai_stop(dev, 0);
 300 
 301         comedi_event(dev, s);
 302 }
 303 
 304 static void usbduxsigma_ao_stop(struct comedi_device *dev, int do_unlink)
 305 {
 306         struct usbduxsigma_private *devpriv = dev->private;
 307 
 308         if (do_unlink && devpriv->ao_urbs)
 309                 usbduxsigma_unlink_urbs(devpriv->ao_urbs, devpriv->n_ao_urbs);
 310 
 311         devpriv->ao_cmd_running = 0;
 312 }
 313 
 314 static int usbduxsigma_ao_cancel(struct comedi_device *dev,
 315                                  struct comedi_subdevice *s)
 316 {
 317         struct usbduxsigma_private *devpriv = dev->private;
 318 
 319         mutex_lock(&devpriv->mut);
 320         /* unlink only if it is really running */
 321         usbduxsigma_ao_stop(dev, devpriv->ao_cmd_running);
 322         mutex_unlock(&devpriv->mut);
 323 
 324         return 0;
 325 }
 326 
 327 static void usbduxsigma_ao_handle_urb(struct comedi_device *dev,
 328                                       struct comedi_subdevice *s,
 329                                       struct urb *urb)
 330 {
 331         struct usbduxsigma_private *devpriv = dev->private;
 332         struct comedi_async *async = s->async;
 333         struct comedi_cmd *cmd = &async->cmd;
 334         u8 *datap;
 335         int ret;
 336         int i;
 337 
 338         devpriv->ao_counter--;
 339         if (devpriv->ao_counter == 0) {
 340                 devpriv->ao_counter = devpriv->ao_timer;
 341 
 342                 if (cmd->stop_src == TRIG_COUNT &&
 343                     async->scans_done >= cmd->stop_arg) {
 344                         async->events |= COMEDI_CB_EOA;
 345                         return;
 346                 }
 347 
 348                 /* transmit data to the USB bus */
 349                 datap = urb->transfer_buffer;
 350                 *datap++ = cmd->chanlist_len;
 351                 for (i = 0; i < cmd->chanlist_len; i++) {
 352                         unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 353                         unsigned short val;
 354 
 355                         if (!comedi_buf_read_samples(s, &val, 1)) {
 356                                 dev_err(dev->class_dev, "buffer underflow\n");
 357                                 async->events |= COMEDI_CB_OVERFLOW;
 358                                 return;
 359                         }
 360 
 361                         *datap++ = val;
 362                         *datap++ = chan;
 363                         s->readback[chan] = val;
 364                 }
 365         }
 366 
 367         /* if command is still running, resubmit urb */
 368         if (!(async->events & COMEDI_CB_CANCEL_MASK)) {
 369                 urb->transfer_buffer_length = SIZEOUTBUF;
 370                 urb->dev = comedi_to_usb_dev(dev);
 371                 urb->status = 0;
 372                 urb->interval = 1;      /* (u)frames */
 373                 urb->number_of_packets = 1;
 374                 urb->iso_frame_desc[0].offset = 0;
 375                 urb->iso_frame_desc[0].length = SIZEOUTBUF;
 376                 urb->iso_frame_desc[0].status = 0;
 377                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 378                 if (ret < 0) {
 379                         dev_err(dev->class_dev, "urb resubmit failed (%d)\n",
 380                                 ret);
 381                         if (ret == -EL2NSYNC)
 382                                 dev_err(dev->class_dev,
 383                                         "buggy USB host controller or bug in IRQ handler\n");
 384                         async->events |= COMEDI_CB_ERROR;
 385                 }
 386         }
 387 }
 388 
 389 static void usbduxsigma_ao_urb_complete(struct urb *urb)
 390 {
 391         struct comedi_device *dev = urb->context;
 392         struct usbduxsigma_private *devpriv = dev->private;
 393         struct comedi_subdevice *s = dev->write_subdev;
 394         struct comedi_async *async = s->async;
 395 
 396         /* exit if not running a command, do not resubmit urb */
 397         if (!devpriv->ao_cmd_running)
 398                 return;
 399 
 400         switch (urb->status) {
 401         case 0:
 402                 usbduxsigma_ao_handle_urb(dev, s, urb);
 403                 break;
 404 
 405         case -ECONNRESET:
 406         case -ENOENT:
 407         case -ESHUTDOWN:
 408         case -ECONNABORTED:
 409                 /* happens after an unlink command */
 410                 async->events |= COMEDI_CB_ERROR;
 411                 break;
 412 
 413         default:
 414                 /* a real error */
 415                 dev_err(dev->class_dev, "non-zero urb status (%d)\n",
 416                         urb->status);
 417                 async->events |= COMEDI_CB_ERROR;
 418                 break;
 419         }
 420 
 421         /*
 422          * comedi_handle_events() cannot be used in this driver. The (*cancel)
 423          * operation would unlink the urb.
 424          */
 425         if (async->events & COMEDI_CB_CANCEL_MASK)
 426                 usbduxsigma_ao_stop(dev, 0);
 427 
 428         comedi_event(dev, s);
 429 }
 430 
 431 static int usbduxsigma_submit_urbs(struct comedi_device *dev,
 432                                    struct urb **urbs, int num_urbs,
 433                                    int input_urb)
 434 {
 435         struct usb_device *usb = comedi_to_usb_dev(dev);
 436         struct urb *urb;
 437         int ret;
 438         int i;
 439 
 440         /* Submit all URBs and start the transfer on the bus */
 441         for (i = 0; i < num_urbs; i++) {
 442                 urb = urbs[i];
 443 
 444                 /* in case of a resubmission after an unlink... */
 445                 if (input_urb)
 446                         urb->interval = 1;
 447                 urb->context = dev;
 448                 urb->dev = usb;
 449                 urb->status = 0;
 450                 urb->transfer_flags = URB_ISO_ASAP;
 451 
 452                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 453                 if (ret)
 454                         return ret;
 455         }
 456         return 0;
 457 }
 458 
 459 static int usbduxsigma_chans_to_interval(int num_chan)
 460 {
 461         if (num_chan <= 2)
 462                 return 2;       /* 4kHz */
 463         if (num_chan <= 8)
 464                 return 4;       /* 2kHz */
 465         return 8;               /* 1kHz */
 466 }
 467 
 468 static int usbduxsigma_ai_cmdtest(struct comedi_device *dev,
 469                                   struct comedi_subdevice *s,
 470                                   struct comedi_cmd *cmd)
 471 {
 472         struct usbduxsigma_private *devpriv = dev->private;
 473         int high_speed = devpriv->high_speed;
 474         int interval = usbduxsigma_chans_to_interval(cmd->chanlist_len);
 475         unsigned int tmp;
 476         int err = 0;
 477 
 478         /* Step 1 : check if triggers are trivially valid */
 479 
 480         err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_INT);
 481         err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
 482         err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
 483         err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 484         err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
 485 
 486         if (err)
 487                 return 1;
 488 
 489         /* Step 2a : make sure trigger sources are unique */
 490 
 491         err |= comedi_check_trigger_is_unique(cmd->start_src);
 492         err |= comedi_check_trigger_is_unique(cmd->stop_src);
 493 
 494         /* Step 2b : and mutually compatible */
 495 
 496         if (err)
 497                 return 2;
 498 
 499         /* Step 3: check if arguments are trivially valid */
 500 
 501         err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 502 
 503         if (high_speed) {
 504                 /*
 505                  * In high speed mode microframes are possible.
 506                  * However, during one microframe we can roughly
 507                  * sample two channels. Thus, the more channels
 508                  * are in the channel list the more time we need.
 509                  */
 510                 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
 511                                                     (125000 * interval));
 512         } else {
 513                 /* full speed */
 514                 /* 1kHz scans every USB frame */
 515                 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
 516                                                     1000000);
 517         }
 518 
 519         err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 520                                            cmd->chanlist_len);
 521 
 522         if (cmd->stop_src == TRIG_COUNT)
 523                 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
 524         else    /* TRIG_NONE */
 525                 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 526 
 527         if (err)
 528                 return 3;
 529 
 530         /* Step 4: fix up any arguments */
 531 
 532         tmp = rounddown(cmd->scan_begin_arg, high_speed ? 125000 : 1000000);
 533         err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp);
 534 
 535         if (err)
 536                 return 4;
 537 
 538         return 0;
 539 }
 540 
 541 /*
 542  * creates the ADC command for the MAX1271
 543  * range is the range value from comedi
 544  */
 545 static void create_adc_command(unsigned int chan,
 546                                u8 *muxsg0, u8 *muxsg1)
 547 {
 548         if (chan < 8)
 549                 (*muxsg0) = (*muxsg0) | (1 << chan);
 550         else if (chan < 16)
 551                 (*muxsg1) = (*muxsg1) | (1 << (chan - 8));
 552 }
 553 
 554 static int usbbuxsigma_send_cmd(struct comedi_device *dev, int cmd_type)
 555 {
 556         struct usb_device *usb = comedi_to_usb_dev(dev);
 557         struct usbduxsigma_private *devpriv = dev->private;
 558         int nsent;
 559 
 560         devpriv->dux_commands[0] = cmd_type;
 561 
 562         return usb_bulk_msg(usb, usb_sndbulkpipe(usb, 1),
 563                             devpriv->dux_commands, SIZEOFDUXBUFFER,
 564                             &nsent, BULK_TIMEOUT);
 565 }
 566 
 567 static int usbduxsigma_receive_cmd(struct comedi_device *dev, int command)
 568 {
 569         struct usb_device *usb = comedi_to_usb_dev(dev);
 570         struct usbduxsigma_private *devpriv = dev->private;
 571         int nrec;
 572         int ret;
 573         int i;
 574 
 575         for (i = 0; i < RETRIES; i++) {
 576                 ret = usb_bulk_msg(usb, usb_rcvbulkpipe(usb, 8),
 577                                    devpriv->insn_buf, SIZEINSNBUF,
 578                                    &nrec, BULK_TIMEOUT);
 579                 if (ret < 0)
 580                         return ret;
 581 
 582                 if (devpriv->insn_buf[0] == command)
 583                         return 0;
 584         }
 585         /*
 586          * This is only reached if the data has been requested a
 587          * couple of times and the command was not received.
 588          */
 589         return -EFAULT;
 590 }
 591 
 592 static int usbduxsigma_ai_inttrig(struct comedi_device *dev,
 593                                   struct comedi_subdevice *s,
 594                                   unsigned int trig_num)
 595 {
 596         struct usbduxsigma_private *devpriv = dev->private;
 597         struct comedi_cmd *cmd = &s->async->cmd;
 598         int ret;
 599 
 600         if (trig_num != cmd->start_arg)
 601                 return -EINVAL;
 602 
 603         mutex_lock(&devpriv->mut);
 604         if (!devpriv->ai_cmd_running) {
 605                 devpriv->ai_cmd_running = 1;
 606                 ret = usbduxsigma_submit_urbs(dev, devpriv->ai_urbs,
 607                                               devpriv->n_ai_urbs, 1);
 608                 if (ret < 0) {
 609                         devpriv->ai_cmd_running = 0;
 610                         mutex_unlock(&devpriv->mut);
 611                         return ret;
 612                 }
 613                 s->async->inttrig = NULL;
 614         }
 615         mutex_unlock(&devpriv->mut);
 616 
 617         return 1;
 618 }
 619 
 620 static int usbduxsigma_ai_cmd(struct comedi_device *dev,
 621                               struct comedi_subdevice *s)
 622 {
 623         struct usbduxsigma_private *devpriv = dev->private;
 624         struct comedi_cmd *cmd = &s->async->cmd;
 625         unsigned int len = cmd->chanlist_len;
 626         u8 muxsg0 = 0;
 627         u8 muxsg1 = 0;
 628         u8 sysred = 0;
 629         int ret;
 630         int i;
 631 
 632         mutex_lock(&devpriv->mut);
 633 
 634         if (devpriv->high_speed) {
 635                 /*
 636                  * every 2 channels get a time window of 125us. Thus, if we
 637                  * sample all 16 channels we need 1ms. If we sample only one
 638                  * channel we need only 125us
 639                  */
 640                 unsigned int interval = usbduxsigma_chans_to_interval(len);
 641 
 642                 devpriv->ai_interval = interval;
 643                 devpriv->ai_timer = cmd->scan_begin_arg / (125000 * interval);
 644         } else {
 645                 /* interval always 1ms */
 646                 devpriv->ai_interval = 1;
 647                 devpriv->ai_timer = cmd->scan_begin_arg / 1000000;
 648         }
 649 
 650         for (i = 0; i < len; i++) {
 651                 unsigned int chan  = CR_CHAN(cmd->chanlist[i]);
 652 
 653                 create_adc_command(chan, &muxsg0, &muxsg1);
 654         }
 655 
 656         devpriv->dux_commands[1] = devpriv->ai_interval;
 657         devpriv->dux_commands[2] = len;  /* num channels per time step */
 658         devpriv->dux_commands[3] = 0x12; /* CONFIG0 */
 659         devpriv->dux_commands[4] = 0x03; /* CONFIG1: 23kHz sample, delay 0us */
 660         devpriv->dux_commands[5] = 0x00; /* CONFIG3: diff. channels off */
 661         devpriv->dux_commands[6] = muxsg0;
 662         devpriv->dux_commands[7] = muxsg1;
 663         devpriv->dux_commands[8] = sysred;
 664 
 665         ret = usbbuxsigma_send_cmd(dev, USBBUXSIGMA_AD_CMD);
 666         if (ret < 0) {
 667                 mutex_unlock(&devpriv->mut);
 668                 return ret;
 669         }
 670 
 671         devpriv->ai_counter = devpriv->ai_timer;
 672 
 673         if (cmd->start_src == TRIG_NOW) {
 674                 /* enable this acquisition operation */
 675                 devpriv->ai_cmd_running = 1;
 676                 ret = usbduxsigma_submit_urbs(dev, devpriv->ai_urbs,
 677                                               devpriv->n_ai_urbs, 1);
 678                 if (ret < 0) {
 679                         devpriv->ai_cmd_running = 0;
 680                         mutex_unlock(&devpriv->mut);
 681                         return ret;
 682                 }
 683                 s->async->inttrig = NULL;
 684         } else {        /* TRIG_INT */
 685                 s->async->inttrig = usbduxsigma_ai_inttrig;
 686         }
 687 
 688         mutex_unlock(&devpriv->mut);
 689 
 690         return 0;
 691 }
 692 
 693 static int usbduxsigma_ai_insn_read(struct comedi_device *dev,
 694                                     struct comedi_subdevice *s,
 695                                     struct comedi_insn *insn,
 696                                     unsigned int *data)
 697 {
 698         struct usbduxsigma_private *devpriv = dev->private;
 699         unsigned int chan = CR_CHAN(insn->chanspec);
 700         u8 muxsg0 = 0;
 701         u8 muxsg1 = 0;
 702         u8 sysred = 0;
 703         int ret;
 704         int i;
 705 
 706         mutex_lock(&devpriv->mut);
 707         if (devpriv->ai_cmd_running) {
 708                 mutex_unlock(&devpriv->mut);
 709                 return -EBUSY;
 710         }
 711 
 712         create_adc_command(chan, &muxsg0, &muxsg1);
 713 
 714         /* Mode 0 is used to get a single conversion on demand */
 715         devpriv->dux_commands[1] = 0x16; /* CONFIG0: chopper on */
 716         devpriv->dux_commands[2] = 0x80; /* CONFIG1: 2kHz sampling rate */
 717         devpriv->dux_commands[3] = 0x00; /* CONFIG3: diff. channels off */
 718         devpriv->dux_commands[4] = muxsg0;
 719         devpriv->dux_commands[5] = muxsg1;
 720         devpriv->dux_commands[6] = sysred;
 721 
 722         /* adc commands */
 723         ret = usbbuxsigma_send_cmd(dev, USBDUXSIGMA_SINGLE_AD_CMD);
 724         if (ret < 0) {
 725                 mutex_unlock(&devpriv->mut);
 726                 return ret;
 727         }
 728 
 729         for (i = 0; i < insn->n; i++) {
 730                 u32 val;
 731 
 732                 ret = usbduxsigma_receive_cmd(dev, USBDUXSIGMA_SINGLE_AD_CMD);
 733                 if (ret < 0) {
 734                         mutex_unlock(&devpriv->mut);
 735                         return ret;
 736                 }
 737 
 738                 /* 32 bits big endian from the A/D converter */
 739                 val = be32_to_cpu(get_unaligned((__be32
 740                                                  *)(devpriv->insn_buf + 1)));
 741                 val &= 0x00ffffff;      /* strip status byte */
 742                 data[i] = comedi_offset_munge(s, val);
 743         }
 744         mutex_unlock(&devpriv->mut);
 745 
 746         return insn->n;
 747 }
 748 
 749 static int usbduxsigma_ao_insn_read(struct comedi_device *dev,
 750                                     struct comedi_subdevice *s,
 751                                     struct comedi_insn *insn,
 752                                     unsigned int *data)
 753 {
 754         struct usbduxsigma_private *devpriv = dev->private;
 755         int ret;
 756 
 757         mutex_lock(&devpriv->mut);
 758         ret = comedi_readback_insn_read(dev, s, insn, data);
 759         mutex_unlock(&devpriv->mut);
 760 
 761         return ret;
 762 }
 763 
 764 static int usbduxsigma_ao_insn_write(struct comedi_device *dev,
 765                                      struct comedi_subdevice *s,
 766                                      struct comedi_insn *insn,
 767                                      unsigned int *data)
 768 {
 769         struct usbduxsigma_private *devpriv = dev->private;
 770         unsigned int chan = CR_CHAN(insn->chanspec);
 771         int ret;
 772         int i;
 773 
 774         mutex_lock(&devpriv->mut);
 775         if (devpriv->ao_cmd_running) {
 776                 mutex_unlock(&devpriv->mut);
 777                 return -EBUSY;
 778         }
 779 
 780         for (i = 0; i < insn->n; i++) {
 781                 devpriv->dux_commands[1] = 1;           /* num channels */
 782                 devpriv->dux_commands[2] = data[i];     /* value */
 783                 devpriv->dux_commands[3] = chan;        /* channel number */
 784                 ret = usbbuxsigma_send_cmd(dev, USBDUXSIGMA_DA_CMD);
 785                 if (ret < 0) {
 786                         mutex_unlock(&devpriv->mut);
 787                         return ret;
 788                 }
 789                 s->readback[chan] = data[i];
 790         }
 791         mutex_unlock(&devpriv->mut);
 792 
 793         return insn->n;
 794 }
 795 
 796 static int usbduxsigma_ao_inttrig(struct comedi_device *dev,
 797                                   struct comedi_subdevice *s,
 798                                   unsigned int trig_num)
 799 {
 800         struct usbduxsigma_private *devpriv = dev->private;
 801         struct comedi_cmd *cmd = &s->async->cmd;
 802         int ret;
 803 
 804         if (trig_num != cmd->start_arg)
 805                 return -EINVAL;
 806 
 807         mutex_lock(&devpriv->mut);
 808         if (!devpriv->ao_cmd_running) {
 809                 devpriv->ao_cmd_running = 1;
 810                 ret = usbduxsigma_submit_urbs(dev, devpriv->ao_urbs,
 811                                               devpriv->n_ao_urbs, 0);
 812                 if (ret < 0) {
 813                         devpriv->ao_cmd_running = 0;
 814                         mutex_unlock(&devpriv->mut);
 815                         return ret;
 816                 }
 817                 s->async->inttrig = NULL;
 818         }
 819         mutex_unlock(&devpriv->mut);
 820 
 821         return 1;
 822 }
 823 
 824 static int usbduxsigma_ao_cmdtest(struct comedi_device *dev,
 825                                   struct comedi_subdevice *s,
 826                                   struct comedi_cmd *cmd)
 827 {
 828         struct usbduxsigma_private *devpriv = dev->private;
 829         unsigned int tmp;
 830         int err = 0;
 831 
 832         /* Step 1 : check if triggers are trivially valid */
 833 
 834         err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_INT);
 835 
 836         /*
 837          * For now, always use "scan" timing with all channels updated at once
 838          * (cmd->scan_begin_src == TRIG_TIMER, cmd->convert_src == TRIG_NOW).
 839          *
 840          * In a future version, "convert" timing with channels updated
 841          * indivually may be supported in high speed mode
 842          * (cmd->scan_begin_src == TRIG_FOLLOW, cmd->convert_src == TRIG_TIMER).
 843          */
 844         err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
 845         err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
 846         err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 847         err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
 848 
 849         if (err) {
 850                 mutex_unlock(&devpriv->mut);
 851                 return 1;
 852         }
 853 
 854         /* Step 2a : make sure trigger sources are unique */
 855 
 856         err |= comedi_check_trigger_is_unique(cmd->start_src);
 857         err |= comedi_check_trigger_is_unique(cmd->stop_src);
 858 
 859         /* Step 2b : and mutually compatible */
 860 
 861         if (err)
 862                 return 2;
 863 
 864         /* Step 3: check if arguments are trivially valid */
 865 
 866         err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 867 
 868         err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 1000000);
 869 
 870         err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 871                                            cmd->chanlist_len);
 872 
 873         if (cmd->stop_src == TRIG_COUNT)
 874                 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
 875         else    /* TRIG_NONE */
 876                 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 877 
 878         if (err)
 879                 return 3;
 880 
 881         /* Step 4: fix up any arguments */
 882 
 883         tmp = rounddown(cmd->scan_begin_arg, 1000000);
 884         err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp);
 885 
 886         if (err)
 887                 return 4;
 888 
 889         return 0;
 890 }
 891 
 892 static int usbduxsigma_ao_cmd(struct comedi_device *dev,
 893                               struct comedi_subdevice *s)
 894 {
 895         struct usbduxsigma_private *devpriv = dev->private;
 896         struct comedi_cmd *cmd = &s->async->cmd;
 897         int ret;
 898 
 899         mutex_lock(&devpriv->mut);
 900 
 901         /*
 902          * For now, only "scan" timing is supported.  A future version may
 903          * support "convert" timing in high speed mode.
 904          *
 905          * Timing of the scan: every 1ms all channels updated at once.
 906          */
 907         devpriv->ao_timer = cmd->scan_begin_arg / 1000000;
 908 
 909         devpriv->ao_counter = devpriv->ao_timer;
 910 
 911         if (cmd->start_src == TRIG_NOW) {
 912                 /* enable this acquisition operation */
 913                 devpriv->ao_cmd_running = 1;
 914                 ret = usbduxsigma_submit_urbs(dev, devpriv->ao_urbs,
 915                                               devpriv->n_ao_urbs, 0);
 916                 if (ret < 0) {
 917                         devpriv->ao_cmd_running = 0;
 918                         mutex_unlock(&devpriv->mut);
 919                         return ret;
 920                 }
 921                 s->async->inttrig = NULL;
 922         } else {        /* TRIG_INT */
 923                 s->async->inttrig = usbduxsigma_ao_inttrig;
 924         }
 925 
 926         mutex_unlock(&devpriv->mut);
 927 
 928         return 0;
 929 }
 930 
 931 static int usbduxsigma_dio_insn_config(struct comedi_device *dev,
 932                                        struct comedi_subdevice *s,
 933                                        struct comedi_insn *insn,
 934                                        unsigned int *data)
 935 {
 936         int ret;
 937 
 938         ret = comedi_dio_insn_config(dev, s, insn, data, 0);
 939         if (ret)
 940                 return ret;
 941 
 942         /*
 943          * We don't tell the firmware here as it would take 8 frames
 944          * to submit the information. We do it in the (*insn_bits).
 945          */
 946         return insn->n;
 947 }
 948 
 949 static int usbduxsigma_dio_insn_bits(struct comedi_device *dev,
 950                                      struct comedi_subdevice *s,
 951                                      struct comedi_insn *insn,
 952                                      unsigned int *data)
 953 {
 954         struct usbduxsigma_private *devpriv = dev->private;
 955         int ret;
 956 
 957         mutex_lock(&devpriv->mut);
 958 
 959         comedi_dio_update_state(s, data);
 960 
 961         /* Always update the hardware. See the (*insn_config). */
 962         devpriv->dux_commands[1] = s->io_bits & 0xff;
 963         devpriv->dux_commands[4] = s->state & 0xff;
 964         devpriv->dux_commands[2] = (s->io_bits >> 8) & 0xff;
 965         devpriv->dux_commands[5] = (s->state >> 8) & 0xff;
 966         devpriv->dux_commands[3] = (s->io_bits >> 16) & 0xff;
 967         devpriv->dux_commands[6] = (s->state >> 16) & 0xff;
 968 
 969         ret = usbbuxsigma_send_cmd(dev, USBDUXSIGMA_DIO_BITS_CMD);
 970         if (ret < 0)
 971                 goto done;
 972         ret = usbduxsigma_receive_cmd(dev, USBDUXSIGMA_DIO_BITS_CMD);
 973         if (ret < 0)
 974                 goto done;
 975 
 976         s->state = devpriv->insn_buf[1] |
 977                    (devpriv->insn_buf[2] << 8) |
 978                    (devpriv->insn_buf[3] << 16);
 979 
 980         data[1] = s->state;
 981         ret = insn->n;
 982 
 983 done:
 984         mutex_unlock(&devpriv->mut);
 985 
 986         return ret;
 987 }
 988 
 989 static void usbduxsigma_pwm_stop(struct comedi_device *dev, int do_unlink)
 990 {
 991         struct usbduxsigma_private *devpriv = dev->private;
 992 
 993         if (do_unlink) {
 994                 if (devpriv->pwm_urb)
 995                         usb_kill_urb(devpriv->pwm_urb);
 996         }
 997 
 998         devpriv->pwm_cmd_running = 0;
 999 }
1000 
1001 static int usbduxsigma_pwm_cancel(struct comedi_device *dev,
1002                                   struct comedi_subdevice *s)
1003 {
1004         struct usbduxsigma_private *devpriv = dev->private;
1005 
1006         /* unlink only if it is really running */
1007         usbduxsigma_pwm_stop(dev, devpriv->pwm_cmd_running);
1008 
1009         return usbbuxsigma_send_cmd(dev, USBDUXSIGMA_PWM_OFF_CMD);
1010 }
1011 
1012 static void usbduxsigma_pwm_urb_complete(struct urb *urb)
1013 {
1014         struct comedi_device *dev = urb->context;
1015         struct usbduxsigma_private *devpriv = dev->private;
1016         int ret;
1017 
1018         switch (urb->status) {
1019         case 0:
1020                 /* success */
1021                 break;
1022 
1023         case -ECONNRESET:
1024         case -ENOENT:
1025         case -ESHUTDOWN:
1026         case -ECONNABORTED:
1027                 /* happens after an unlink command */
1028                 if (devpriv->pwm_cmd_running)
1029                         usbduxsigma_pwm_stop(dev, 0);   /* w/o unlink */
1030                 return;
1031 
1032         default:
1033                 /* a real error */
1034                 if (devpriv->pwm_cmd_running) {
1035                         dev_err(dev->class_dev, "non-zero urb status (%d)\n",
1036                                 urb->status);
1037                         usbduxsigma_pwm_stop(dev, 0);   /* w/o unlink */
1038                 }
1039                 return;
1040         }
1041 
1042         if (!devpriv->pwm_cmd_running)
1043                 return;
1044 
1045         urb->transfer_buffer_length = devpriv->pwm_buf_sz;
1046         urb->dev = comedi_to_usb_dev(dev);
1047         urb->status = 0;
1048         ret = usb_submit_urb(urb, GFP_ATOMIC);
1049         if (ret < 0) {
1050                 dev_err(dev->class_dev, "urb resubmit failed (%d)\n", ret);
1051                 if (ret == -EL2NSYNC)
1052                         dev_err(dev->class_dev,
1053                                 "buggy USB host controller or bug in IRQ handler\n");
1054                 usbduxsigma_pwm_stop(dev, 0);   /* w/o unlink */
1055         }
1056 }
1057 
1058 static int usbduxsigma_submit_pwm_urb(struct comedi_device *dev)
1059 {
1060         struct usb_device *usb = comedi_to_usb_dev(dev);
1061         struct usbduxsigma_private *devpriv = dev->private;
1062         struct urb *urb = devpriv->pwm_urb;
1063 
1064         /* in case of a resubmission after an unlink... */
1065         usb_fill_bulk_urb(urb, usb, usb_sndbulkpipe(usb, 4),
1066                           urb->transfer_buffer, devpriv->pwm_buf_sz,
1067                           usbduxsigma_pwm_urb_complete, dev);
1068 
1069         return usb_submit_urb(urb, GFP_ATOMIC);
1070 }
1071 
1072 static int usbduxsigma_pwm_period(struct comedi_device *dev,
1073                                   struct comedi_subdevice *s,
1074                                   unsigned int period)
1075 {
1076         struct usbduxsigma_private *devpriv = dev->private;
1077         int fx2delay;
1078 
1079         if (period < MIN_PWM_PERIOD)
1080                 return -EAGAIN;
1081 
1082         fx2delay = (period / (6 * 512 * 1000 / 33)) - 6;
1083         if (fx2delay > 255)
1084                 return -EAGAIN;
1085 
1086         devpriv->pwm_delay = fx2delay;
1087         devpriv->pwm_period = period;
1088         return 0;
1089 }
1090 
1091 static int usbduxsigma_pwm_start(struct comedi_device *dev,
1092                                  struct comedi_subdevice *s)
1093 {
1094         struct usbduxsigma_private *devpriv = dev->private;
1095         int ret;
1096 
1097         if (devpriv->pwm_cmd_running)
1098                 return 0;
1099 
1100         devpriv->dux_commands[1] = devpriv->pwm_delay;
1101         ret = usbbuxsigma_send_cmd(dev, USBDUXSIGMA_PWM_ON_CMD);
1102         if (ret < 0)
1103                 return ret;
1104 
1105         memset(devpriv->pwm_urb->transfer_buffer, 0, devpriv->pwm_buf_sz);
1106 
1107         devpriv->pwm_cmd_running = 1;
1108         ret = usbduxsigma_submit_pwm_urb(dev);
1109         if (ret < 0) {
1110                 devpriv->pwm_cmd_running = 0;
1111                 return ret;
1112         }
1113 
1114         return 0;
1115 }
1116 
1117 static void usbduxsigma_pwm_pattern(struct comedi_device *dev,
1118                                     struct comedi_subdevice *s,
1119                                     unsigned int chan,
1120                                     unsigned int value,
1121                                     unsigned int sign)
1122 {
1123         struct usbduxsigma_private *devpriv = dev->private;
1124         char pwm_mask = (1 << chan);    /* DIO bit for the PWM data */
1125         char sgn_mask = (16 << chan);   /* DIO bit for the sign */
1126         char *buf = (char *)(devpriv->pwm_urb->transfer_buffer);
1127         int szbuf = devpriv->pwm_buf_sz;
1128         int i;
1129 
1130         for (i = 0; i < szbuf; i++) {
1131                 char c = *buf;
1132 
1133                 c &= ~pwm_mask;
1134                 if (i < value)
1135                         c |= pwm_mask;
1136                 if (!sign)
1137                         c &= ~sgn_mask;
1138                 else
1139                         c |= sgn_mask;
1140                 *buf++ = c;
1141         }
1142 }
1143 
1144 static int usbduxsigma_pwm_write(struct comedi_device *dev,
1145                                  struct comedi_subdevice *s,
1146                                  struct comedi_insn *insn,
1147                                  unsigned int *data)
1148 {
1149         unsigned int chan = CR_CHAN(insn->chanspec);
1150 
1151         /*
1152          * It doesn't make sense to support more than one value here
1153          * because it would just overwrite the PWM buffer.
1154          */
1155         if (insn->n != 1)
1156                 return -EINVAL;
1157 
1158         /*
1159          * The sign is set via a special INSN only, this gives us 8 bits
1160          * for normal operation, sign is 0 by default.
1161          */
1162         usbduxsigma_pwm_pattern(dev, s, chan, data[0], 0);
1163 
1164         return insn->n;
1165 }
1166 
1167 static int usbduxsigma_pwm_config(struct comedi_device *dev,
1168                                   struct comedi_subdevice *s,
1169                                   struct comedi_insn *insn,
1170                                   unsigned int *data)
1171 {
1172         struct usbduxsigma_private *devpriv = dev->private;
1173         unsigned int chan = CR_CHAN(insn->chanspec);
1174 
1175         switch (data[0]) {
1176         case INSN_CONFIG_ARM:
1177                 /*
1178                  * if not zero the PWM is limited to a certain time which is
1179                  * not supported here
1180                  */
1181                 if (data[1] != 0)
1182                         return -EINVAL;
1183                 return usbduxsigma_pwm_start(dev, s);
1184         case INSN_CONFIG_DISARM:
1185                 return usbduxsigma_pwm_cancel(dev, s);
1186         case INSN_CONFIG_GET_PWM_STATUS:
1187                 data[1] = devpriv->pwm_cmd_running;
1188                 return 0;
1189         case INSN_CONFIG_PWM_SET_PERIOD:
1190                 return usbduxsigma_pwm_period(dev, s, data[1]);
1191         case INSN_CONFIG_PWM_GET_PERIOD:
1192                 data[1] = devpriv->pwm_period;
1193                 return 0;
1194         case INSN_CONFIG_PWM_SET_H_BRIDGE:
1195                 /*
1196                  * data[1] = value
1197                  * data[2] = sign (for a relay)
1198                  */
1199                 usbduxsigma_pwm_pattern(dev, s, chan, data[1], (data[2] != 0));
1200                 return 0;
1201         case INSN_CONFIG_PWM_GET_H_BRIDGE:
1202                 /* values are not kept in this driver, nothing to return */
1203                 return -EINVAL;
1204         }
1205         return -EINVAL;
1206 }
1207 
1208 static int usbduxsigma_getstatusinfo(struct comedi_device *dev, int chan)
1209 {
1210         struct comedi_subdevice *s = dev->read_subdev;
1211         struct usbduxsigma_private *devpriv = dev->private;
1212         u8 sysred;
1213         u32 val;
1214         int ret;
1215 
1216         switch (chan) {
1217         default:
1218         case 0:
1219                 sysred = 0;             /* ADC zero */
1220                 break;
1221         case 1:
1222                 sysred = 1;             /* ADC offset */
1223                 break;
1224         case 2:
1225                 sysred = 4;             /* VCC */
1226                 break;
1227         case 3:
1228                 sysred = 8;             /* temperature */
1229                 break;
1230         case 4:
1231                 sysred = 16;            /* gain */
1232                 break;
1233         case 5:
1234                 sysred =  32;           /* ref */
1235                 break;
1236         }
1237 
1238         devpriv->dux_commands[1] = 0x12; /* CONFIG0 */
1239         devpriv->dux_commands[2] = 0x80; /* CONFIG1: 2kHz sampling rate */
1240         devpriv->dux_commands[3] = 0x00; /* CONFIG3: diff. channels off */
1241         devpriv->dux_commands[4] = 0;
1242         devpriv->dux_commands[5] = 0;
1243         devpriv->dux_commands[6] = sysred;
1244         ret = usbbuxsigma_send_cmd(dev, USBDUXSIGMA_SINGLE_AD_CMD);
1245         if (ret < 0)
1246                 return ret;
1247 
1248         ret = usbduxsigma_receive_cmd(dev, USBDUXSIGMA_SINGLE_AD_CMD);
1249         if (ret < 0)
1250                 return ret;
1251 
1252         /* 32 bits big endian from the A/D converter */
1253         val = be32_to_cpu(get_unaligned((__be32 *)(devpriv->insn_buf + 1)));
1254         val &= 0x00ffffff;      /* strip status byte */
1255 
1256         return (int)comedi_offset_munge(s, val);
1257 }
1258 
1259 static int usbduxsigma_firmware_upload(struct comedi_device *dev,
1260                                        const u8 *data, size_t size,
1261                                        unsigned long context)
1262 {
1263         struct usb_device *usb = comedi_to_usb_dev(dev);
1264         u8 *buf;
1265         u8 *tmp;
1266         int ret;
1267 
1268         if (!data)
1269                 return 0;
1270 
1271         if (size > FIRMWARE_MAX_LEN) {
1272                 dev_err(dev->class_dev, "firmware binary too large for FX2\n");
1273                 return -ENOMEM;
1274         }
1275 
1276         /* we generate a local buffer for the firmware */
1277         buf = kmemdup(data, size, GFP_KERNEL);
1278         if (!buf)
1279                 return -ENOMEM;
1280 
1281         /* we need a malloc'ed buffer for usb_control_msg() */
1282         tmp = kmalloc(1, GFP_KERNEL);
1283         if (!tmp) {
1284                 kfree(buf);
1285                 return -ENOMEM;
1286         }
1287 
1288         /* stop the current firmware on the device */
1289         *tmp = 1;       /* 7f92 to one */
1290         ret = usb_control_msg(usb, usb_sndctrlpipe(usb, 0),
1291                               USBDUXSUB_FIRMWARE,
1292                               VENDOR_DIR_OUT,
1293                               USBDUXSUB_CPUCS, 0x0000,
1294                               tmp, 1,
1295                               BULK_TIMEOUT);
1296         if (ret < 0) {
1297                 dev_err(dev->class_dev, "can not stop firmware\n");
1298                 goto done;
1299         }
1300 
1301         /* upload the new firmware to the device */
1302         ret = usb_control_msg(usb, usb_sndctrlpipe(usb, 0),
1303                               USBDUXSUB_FIRMWARE,
1304                               VENDOR_DIR_OUT,
1305                               0, 0x0000,
1306                               buf, size,
1307                               BULK_TIMEOUT);
1308         if (ret < 0) {
1309                 dev_err(dev->class_dev, "firmware upload failed\n");
1310                 goto done;
1311         }
1312 
1313         /* start the new firmware on the device */
1314         *tmp = 0;       /* 7f92 to zero */
1315         ret = usb_control_msg(usb, usb_sndctrlpipe(usb, 0),
1316                               USBDUXSUB_FIRMWARE,
1317                               VENDOR_DIR_OUT,
1318                               USBDUXSUB_CPUCS, 0x0000,
1319                               tmp, 1,
1320                               BULK_TIMEOUT);
1321         if (ret < 0)
1322                 dev_err(dev->class_dev, "can not start firmware\n");
1323 
1324 done:
1325         kfree(tmp);
1326         kfree(buf);
1327         return ret;
1328 }
1329 
1330 static int usbduxsigma_alloc_usb_buffers(struct comedi_device *dev)
1331 {
1332         struct usb_device *usb = comedi_to_usb_dev(dev);
1333         struct usbduxsigma_private *devpriv = dev->private;
1334         struct urb *urb;
1335         int i;
1336 
1337         devpriv->dux_commands = kzalloc(SIZEOFDUXBUFFER, GFP_KERNEL);
1338         devpriv->in_buf = kzalloc(SIZEINBUF, GFP_KERNEL);
1339         devpriv->insn_buf = kzalloc(SIZEINSNBUF, GFP_KERNEL);
1340         devpriv->ai_urbs = kcalloc(devpriv->n_ai_urbs, sizeof(urb), GFP_KERNEL);
1341         devpriv->ao_urbs = kcalloc(devpriv->n_ao_urbs, sizeof(urb), GFP_KERNEL);
1342         if (!devpriv->dux_commands || !devpriv->in_buf || !devpriv->insn_buf ||
1343             !devpriv->ai_urbs || !devpriv->ao_urbs)
1344                 return -ENOMEM;
1345 
1346         for (i = 0; i < devpriv->n_ai_urbs; i++) {
1347                 /* one frame: 1ms */
1348                 urb = usb_alloc_urb(1, GFP_KERNEL);
1349                 if (!urb)
1350                         return -ENOMEM;
1351                 devpriv->ai_urbs[i] = urb;
1352                 urb->dev = usb;
1353                 /* will be filled later with a pointer to the comedi-device */
1354                 /* and ONLY then the urb should be submitted */
1355                 urb->context = NULL;
1356                 urb->pipe = usb_rcvisocpipe(usb, 6);
1357                 urb->transfer_flags = URB_ISO_ASAP;
1358                 urb->transfer_buffer = kzalloc(SIZEINBUF, GFP_KERNEL);
1359                 if (!urb->transfer_buffer)
1360                         return -ENOMEM;
1361                 urb->complete = usbduxsigma_ai_urb_complete;
1362                 urb->number_of_packets = 1;
1363                 urb->transfer_buffer_length = SIZEINBUF;
1364                 urb->iso_frame_desc[0].offset = 0;
1365                 urb->iso_frame_desc[0].length = SIZEINBUF;
1366         }
1367 
1368         for (i = 0; i < devpriv->n_ao_urbs; i++) {
1369                 /* one frame: 1ms */
1370                 urb = usb_alloc_urb(1, GFP_KERNEL);
1371                 if (!urb)
1372                         return -ENOMEM;
1373                 devpriv->ao_urbs[i] = urb;
1374                 urb->dev = usb;
1375                 /* will be filled later with a pointer to the comedi-device */
1376                 /* and ONLY then the urb should be submitted */
1377                 urb->context = NULL;
1378                 urb->pipe = usb_sndisocpipe(usb, 2);
1379                 urb->transfer_flags = URB_ISO_ASAP;
1380                 urb->transfer_buffer = kzalloc(SIZEOUTBUF, GFP_KERNEL);
1381                 if (!urb->transfer_buffer)
1382                         return -ENOMEM;
1383                 urb->complete = usbduxsigma_ao_urb_complete;
1384                 urb->number_of_packets = 1;
1385                 urb->transfer_buffer_length = SIZEOUTBUF;
1386                 urb->iso_frame_desc[0].offset = 0;
1387                 urb->iso_frame_desc[0].length = SIZEOUTBUF;
1388                 urb->interval = 1;      /* (u)frames */
1389         }
1390 
1391         if (devpriv->pwm_buf_sz) {
1392                 urb = usb_alloc_urb(0, GFP_KERNEL);
1393                 if (!urb)
1394                         return -ENOMEM;
1395                 devpriv->pwm_urb = urb;
1396 
1397                 urb->transfer_buffer = kzalloc(devpriv->pwm_buf_sz,
1398                                                GFP_KERNEL);
1399                 if (!urb->transfer_buffer)
1400                         return -ENOMEM;
1401         }
1402 
1403         return 0;
1404 }
1405 
1406 static void usbduxsigma_free_usb_buffers(struct comedi_device *dev)
1407 {
1408         struct usbduxsigma_private *devpriv = dev->private;
1409         struct urb *urb;
1410         int i;
1411 
1412         urb = devpriv->pwm_urb;
1413         if (urb) {
1414                 kfree(urb->transfer_buffer);
1415                 usb_free_urb(urb);
1416         }
1417         if (devpriv->ao_urbs) {
1418                 for (i = 0; i < devpriv->n_ao_urbs; i++) {
1419                         urb = devpriv->ao_urbs[i];
1420                         if (urb) {
1421                                 kfree(urb->transfer_buffer);
1422                                 usb_free_urb(urb);
1423                         }
1424                 }
1425                 kfree(devpriv->ao_urbs);
1426         }
1427         if (devpriv->ai_urbs) {
1428                 for (i = 0; i < devpriv->n_ai_urbs; i++) {
1429                         urb = devpriv->ai_urbs[i];
1430                         if (urb) {
1431                                 kfree(urb->transfer_buffer);
1432                                 usb_free_urb(urb);
1433                         }
1434                 }
1435                 kfree(devpriv->ai_urbs);
1436         }
1437         kfree(devpriv->insn_buf);
1438         kfree(devpriv->in_buf);
1439         kfree(devpriv->dux_commands);
1440 }
1441 
1442 static int usbduxsigma_auto_attach(struct comedi_device *dev,
1443                                    unsigned long context_unused)
1444 {
1445         struct usb_interface *intf = comedi_to_usb_interface(dev);
1446         struct usb_device *usb = comedi_to_usb_dev(dev);
1447         struct usbduxsigma_private *devpriv;
1448         struct comedi_subdevice *s;
1449         int offset;
1450         int ret;
1451 
1452         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1453         if (!devpriv)
1454                 return -ENOMEM;
1455 
1456         mutex_init(&devpriv->mut);
1457 
1458         usb_set_intfdata(intf, devpriv);
1459 
1460         devpriv->high_speed = (usb->speed == USB_SPEED_HIGH);
1461         if (devpriv->high_speed) {
1462                 devpriv->n_ai_urbs = NUMOFINBUFFERSHIGH;
1463                 devpriv->n_ao_urbs = NUMOFOUTBUFFERSHIGH;
1464                 devpriv->pwm_buf_sz = 512;
1465         } else {
1466                 devpriv->n_ai_urbs = NUMOFINBUFFERSFULL;
1467                 devpriv->n_ao_urbs = NUMOFOUTBUFFERSFULL;
1468         }
1469 
1470         ret = usbduxsigma_alloc_usb_buffers(dev);
1471         if (ret)
1472                 return ret;
1473 
1474         /* setting to alternate setting 3: enabling iso ep and bulk ep. */
1475         ret = usb_set_interface(usb, intf->altsetting->desc.bInterfaceNumber,
1476                                 3);
1477         if (ret < 0) {
1478                 dev_err(dev->class_dev,
1479                         "could not set alternate setting 3 in high speed\n");
1480                 return ret;
1481         }
1482 
1483         ret = comedi_load_firmware(dev, &usb->dev, FIRMWARE,
1484                                    usbduxsigma_firmware_upload, 0);
1485         if (ret)
1486                 return ret;
1487 
1488         ret = comedi_alloc_subdevices(dev, (devpriv->high_speed) ? 4 : 3);
1489         if (ret)
1490                 return ret;
1491 
1492         /* Analog Input subdevice */
1493         s = &dev->subdevices[0];
1494         dev->read_subdev = s;
1495         s->type         = COMEDI_SUBD_AI;
1496         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ | SDF_LSAMPL;
1497         s->n_chan       = NUMCHANNELS;
1498         s->len_chanlist = NUMCHANNELS;
1499         s->maxdata      = 0x00ffffff;
1500         s->range_table  = &usbduxsigma_ai_range;
1501         s->insn_read    = usbduxsigma_ai_insn_read;
1502         s->do_cmdtest   = usbduxsigma_ai_cmdtest;
1503         s->do_cmd       = usbduxsigma_ai_cmd;
1504         s->cancel       = usbduxsigma_ai_cancel;
1505 
1506         /* Analog Output subdevice */
1507         s = &dev->subdevices[1];
1508         dev->write_subdev = s;
1509         s->type         = COMEDI_SUBD_AO;
1510         s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
1511         s->n_chan       = 4;
1512         s->len_chanlist = s->n_chan;
1513         s->maxdata      = 0x00ff;
1514         s->range_table  = &range_unipolar2_5;
1515         s->insn_write   = usbduxsigma_ao_insn_write;
1516         s->insn_read    = usbduxsigma_ao_insn_read;
1517         s->do_cmdtest   = usbduxsigma_ao_cmdtest;
1518         s->do_cmd       = usbduxsigma_ao_cmd;
1519         s->cancel       = usbduxsigma_ao_cancel;
1520 
1521         ret = comedi_alloc_subdev_readback(s);
1522         if (ret)
1523                 return ret;
1524 
1525         /* Digital I/O subdevice */
1526         s = &dev->subdevices[2];
1527         s->type         = COMEDI_SUBD_DIO;
1528         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
1529         s->n_chan       = 24;
1530         s->maxdata      = 1;
1531         s->range_table  = &range_digital;
1532         s->insn_bits    = usbduxsigma_dio_insn_bits;
1533         s->insn_config  = usbduxsigma_dio_insn_config;
1534 
1535         if (devpriv->high_speed) {
1536                 /* Timer / pwm subdevice */
1537                 s = &dev->subdevices[3];
1538                 s->type         = COMEDI_SUBD_PWM;
1539                 s->subdev_flags = SDF_WRITABLE | SDF_PWM_HBRIDGE;
1540                 s->n_chan       = 8;
1541                 s->maxdata      = devpriv->pwm_buf_sz;
1542                 s->insn_write   = usbduxsigma_pwm_write;
1543                 s->insn_config  = usbduxsigma_pwm_config;
1544 
1545                 usbduxsigma_pwm_period(dev, s, PWM_DEFAULT_PERIOD);
1546         }
1547 
1548         offset = usbduxsigma_getstatusinfo(dev, 0);
1549         if (offset < 0) {
1550                 dev_err(dev->class_dev,
1551                         "Communication to USBDUXSIGMA failed! Check firmware and cabling.\n");
1552                 return offset;
1553         }
1554 
1555         dev_info(dev->class_dev, "ADC_zero = %x\n", offset);
1556 
1557         return 0;
1558 }
1559 
1560 static void usbduxsigma_detach(struct comedi_device *dev)
1561 {
1562         struct usb_interface *intf = comedi_to_usb_interface(dev);
1563         struct usbduxsigma_private *devpriv = dev->private;
1564 
1565         usb_set_intfdata(intf, NULL);
1566 
1567         if (!devpriv)
1568                 return;
1569 
1570         mutex_lock(&devpriv->mut);
1571 
1572         /* force unlink all urbs */
1573         usbduxsigma_ai_stop(dev, 1);
1574         usbduxsigma_ao_stop(dev, 1);
1575         usbduxsigma_pwm_stop(dev, 1);
1576 
1577         usbduxsigma_free_usb_buffers(dev);
1578 
1579         mutex_unlock(&devpriv->mut);
1580 
1581         mutex_destroy(&devpriv->mut);
1582 }
1583 
1584 static struct comedi_driver usbduxsigma_driver = {
1585         .driver_name    = "usbduxsigma",
1586         .module         = THIS_MODULE,
1587         .auto_attach    = usbduxsigma_auto_attach,
1588         .detach         = usbduxsigma_detach,
1589 };
1590 
1591 static int usbduxsigma_usb_probe(struct usb_interface *intf,
1592                                  const struct usb_device_id *id)
1593 {
1594         return comedi_usb_auto_config(intf, &usbduxsigma_driver, 0);
1595 }
1596 
1597 static const struct usb_device_id usbduxsigma_usb_table[] = {
1598         { USB_DEVICE(0x13d8, 0x0020) },
1599         { USB_DEVICE(0x13d8, 0x0021) },
1600         { USB_DEVICE(0x13d8, 0x0022) },
1601         { }
1602 };
1603 MODULE_DEVICE_TABLE(usb, usbduxsigma_usb_table);
1604 
1605 static struct usb_driver usbduxsigma_usb_driver = {
1606         .name           = "usbduxsigma",
1607         .probe          = usbduxsigma_usb_probe,
1608         .disconnect     = comedi_usb_auto_unconfig,
1609         .id_table       = usbduxsigma_usb_table,
1610 };
1611 module_comedi_usb_driver(usbduxsigma_driver, usbduxsigma_usb_driver);
1612 
1613 MODULE_AUTHOR("Bernd Porr, mail@berndporr.me.uk");
1614 MODULE_DESCRIPTION("Stirling/ITL USB-DUX SIGMA -- mail@berndporr.me.uk");
1615 MODULE_LICENSE("GPL");
1616 MODULE_FIRMWARE(FIRMWARE);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/comedi/drivers/usbduxsigma.c

DEFINITIONS
