kernel/2.6.29.6-aldebaran-rt/drivers/staging/comedi/comedidev.h

   1 /*
   2     include/linux/comedidev.h
   3     header file for kernel-only structures, variables, and constants
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #ifndef _COMEDIDEV_H
  25 #define _COMEDIDEV_H
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/version.h>
  30 #include <linux/kdev_t.h>
  31 #include <linux/slab.h>
  32 #include <linux/errno.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/mutex.h>
  35 #include <linux/wait.h>
  36 #include <linux/mm.h>
  37 #include <linux/init.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/mm.h>
  40 #include "interrupt.h"
  41 #include <linux/dma-mapping.h>
  42 #include <linux/uaccess.h>
  43 #include <linux/io.h>
  44
  45 #include "comedi.h"
  46
  47 #define DPRINTK(format, args...)        do {            \
  48         if (comedi_debug)                               \
  49                 printk(KERN_DEBUG "comedi: " format , ## args); \
  50 } while (0)
  51
  52 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
  53 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, COMEDI_MINORVERSION, COMEDI_MICROVERSION)
  54 #define COMEDI_RELEASE VERSION
  55
  56 #define COMEDI_INITCLEANUP_NOMODULE(x)                                  \
  57         static int __init x ## _init_module(void)                       \
  58                 {return comedi_driver_register(&(x));}                  \
  59         static void __exit x ## _cleanup_module(void)                   \
  60                 {comedi_driver_unregister(&(x));}                       \
  61         module_init(x ## _init_module);                                 \
  62         module_exit(x ## _cleanup_module);                                      \
  63
  64 #define COMEDI_MODULE_MACROS                                            \
  65         MODULE_AUTHOR("Comedi http://www.comedi.org");          \
  66         MODULE_DESCRIPTION("Comedi low-level driver");                  \
  67         MODULE_LICENSE("GPL");                                          \
  68
  69 #define COMEDI_INITCLEANUP(x)                                           \
  70         COMEDI_MODULE_MACROS            \
  71         COMEDI_INITCLEANUP_NOMODULE(x)
  72
  73 #define COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table) \
  74         static int __devinit comedi_driver ## _pci_probe(struct pci_dev *dev, \
  75                 const struct pci_device_id *ent) \
  76         { \
  77                 return comedi_pci_auto_config(dev, comedi_driver.driver_name); \
  78         } \
  79         static void __devexit comedi_driver ## _pci_remove(struct pci_dev *dev) \
  80         { \
  81                 comedi_pci_auto_unconfig(dev); \
  82         } \
  83         static struct pci_driver comedi_driver ## _pci_driver = \
  84         { \
  85                 .id_table = pci_id_table, \
  86                 .probe = &comedi_driver ## _pci_probe, \
  87                 .remove = __devexit_p(&comedi_driver ## _pci_remove) \
  88         }; \
  89         static int __init comedi_driver ## _init_module(void) \
  90         { \
  91                 int retval; \
  92                 retval = comedi_driver_register(&comedi_driver); \
  93                 if (retval < 0) \
  94                         return retval; \
  95                 comedi_driver ## _pci_driver.name = (char *)comedi_driver.driver_name; \
  96                 return pci_register_driver(&comedi_driver ## _pci_driver); \
  97         } \
  98         static void __exit comedi_driver ## _cleanup_module(void) \
  99         { \
 100                 pci_unregister_driver(&comedi_driver ## _pci_driver); \
 101                 comedi_driver_unregister(&comedi_driver); \
 102         } \
 103         module_init(comedi_driver ## _init_module); \
 104         module_exit(comedi_driver ## _cleanup_module);
 105
 106 #define COMEDI_PCI_INITCLEANUP(comedi_driver, pci_id_table) \
 107         COMEDI_MODULE_MACROS \
 108         COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table)
 109
 110 #define PCI_VENDOR_ID_INOVA             0x104c
 111 #define PCI_VENDOR_ID_NATINST           0x1093
 112 #define PCI_VENDOR_ID_DATX              0x1116
 113 #define PCI_VENDOR_ID_COMPUTERBOARDS    0x1307
 114 #define PCI_VENDOR_ID_ADVANTECH         0x13fe
 115 #define PCI_VENDOR_ID_RTD               0x1435
 116 #define PCI_VENDOR_ID_AMPLICON          0x14dc
 117 #define PCI_VENDOR_ID_ADLINK            0x144a
 118 #define PCI_VENDOR_ID_ICP               0x104c
 119 #define PCI_VENDOR_ID_CONTEC            0x1221
 120 #define PCI_VENDOR_ID_MEILHAUS          0x1402
 121
 122 #define COMEDI_NUM_MINORS 0x100
 123 #define COMEDI_NUM_LEGACY_MINORS 0x10
 124 #define COMEDI_NUM_BOARD_MINORS 0x30
 125 #define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS
 126
 127 typedef struct comedi_device_struct comedi_device;
 128 typedef struct comedi_subdevice_struct comedi_subdevice;
 129 typedef struct comedi_async_struct comedi_async;
 130 typedef struct comedi_driver_struct comedi_driver;
 131 typedef struct comedi_lrange_struct comedi_lrange;
 132
 133 typedef struct device device_create_result_type;
 134
 135 #define COMEDI_DEVICE_CREATE(cs, parent, devt, drvdata, device, fmt...) \
 136         device_create(cs, ((parent) ? (parent) : (device)), devt, drvdata, fmt)
 137
 138 struct comedi_subdevice_struct {
 139         comedi_device *device;
 140         int type;
 141         int n_chan;
 142         volatile int subdev_flags;
 143         int len_chanlist;       /* maximum length of channel/gain list */
 144
 145         void *private;
 146
 147         comedi_async *async;
 148
 149         void *lock;
 150         void *busy;
 151         unsigned runflags;
 152         spinlock_t spin_lock;
 153
 154         int io_bits;
 155
 156         lsampl_t maxdata;       /* if maxdata==0, use list */
 157         const lsampl_t *maxdata_list;   /* list is channel specific */
 158
 159         unsigned int flags;
 160         const unsigned int *flaglist;
 161
 162         unsigned int settling_time_0;
 163
 164         const comedi_lrange *range_table;
 165         const comedi_lrange *const *range_table_list;
 166
 167         unsigned int *chanlist; /* driver-owned chanlist (not used) */
 168
 169         int (*insn_read) (comedi_device *, comedi_subdevice *, comedi_insn *,
 170                 lsampl_t *);
 171         int (*insn_write) (comedi_device *, comedi_subdevice *, comedi_insn *,
 172                 lsampl_t *);
 173         int (*insn_bits) (comedi_device *, comedi_subdevice *, comedi_insn *,
 174                 lsampl_t *);
 175         int (*insn_config) (comedi_device *, comedi_subdevice *, comedi_insn *,
 176                 lsampl_t *);
 177
 178         int (*do_cmd) (comedi_device *, comedi_subdevice *);
 179         int (*do_cmdtest) (comedi_device *, comedi_subdevice *, comedi_cmd *);
 180         int (*poll) (comedi_device *, comedi_subdevice *);
 181         int (*cancel) (comedi_device *, comedi_subdevice *);
 182         /* int (*do_lock)(comedi_device *,comedi_subdevice *); */
 183         /* int (*do_unlock)(comedi_device *,comedi_subdevice *); */
 184
 185         /* called when the buffer changes */
 186         int (*buf_change) (comedi_device *dev, comedi_subdevice *s,
 187                 unsigned long new_size);
 188
 189         void (*munge) (comedi_device *dev, comedi_subdevice *s, void *data,
 190                 unsigned int num_bytes, unsigned int start_chan_index);
 191         enum dma_data_direction async_dma_dir;
 192
 193         unsigned int state;
 194
 195         device_create_result_type *class_dev;
 196         int minor;
 197 };
 198
 199 struct comedi_buf_page {
 200         void *virt_addr;
 201         dma_addr_t dma_addr;
 202 };
 203
 204 struct comedi_async_struct {
 205         comedi_subdevice *subdevice;
 206
 207         void *prealloc_buf;     /* pre-allocated buffer */
 208         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 209         struct comedi_buf_page *buf_page_list;  /* virtual and dma address of each page */
 210         unsigned n_buf_pages;   /* num elements in buf_page_list */
 211
 212         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 213         unsigned int mmap_count;        /* current number of mmaps of prealloc_buf */
 214
 215         unsigned int buf_write_count;   /* byte count for writer (write completed) */
 216         unsigned int buf_write_alloc_count;     /* byte count for writer (allocated for writing) */
 217         unsigned int buf_read_count;    /* byte count for reader (read completed) */
 218         unsigned int buf_read_alloc_count;      /* byte count for reader (allocated for reading) */
 219
 220         unsigned int buf_write_ptr;     /* buffer marker for writer */
 221         unsigned int buf_read_ptr;      /* buffer marker for reader */
 222
 223         unsigned int cur_chan;  /* useless channel marker for interrupt */
 224         /* number of bytes that have been received for current scan */
 225         unsigned int scan_progress;
 226         /* keeps track of where we are in chanlist as for munging */
 227         unsigned int munge_chan;
 228         /* number of bytes that have been munged */
 229         unsigned int munge_count;
 230         /* buffer marker for munging */
 231         unsigned int munge_ptr;
 232
 233         unsigned int events;    /* events that have occurred */
 234
 235         comedi_cmd cmd;
 236
 237         wait_queue_head_t wait_head;
 238
 239         /* callback stuff */
 240         unsigned int cb_mask;
 241         int (*cb_func) (unsigned int flags, void *);
 242         void *cb_arg;
 243
 244         int (*inttrig) (comedi_device *dev, comedi_subdevice *s,
 245                         unsigned int x);
 246 };
 247
 248 struct comedi_driver_struct {
 249         struct comedi_driver_struct *next;
 250
 251         const char *driver_name;
 252         struct module *module;
 253         int (*attach) (comedi_device *, comedi_devconfig *);
 254         int (*detach) (comedi_device *);
 255
 256         /* number of elements in board_name and board_id arrays */
 257         unsigned int num_names;
 258         const char *const *board_name;
 259         /* offset in bytes from one board name pointer to the next */
 260         int offset;
 261 };
 262
 263 struct comedi_device_struct {
 264         int use_count;
 265         comedi_driver *driver;
 266         void *private;
 267
 268         device_create_result_type *class_dev;
 269         int minor;
 270         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 271          * for subdevices that have async_dma_dir set to something other than
 272          * DMA_NONE */
 273         struct device *hw_dev;
 274
 275         const char *board_name;
 276         const void *board_ptr;
 277         int attached;
 278         int rt;
 279         spinlock_t spinlock;
 280         struct mutex mutex;
 281         int in_request_module;
 282
 283         int n_subdevices;
 284         comedi_subdevice *subdevices;
 285
 286         /* dumb */
 287         unsigned long iobase;
 288         unsigned int irq;
 289
 290         comedi_subdevice *read_subdev;
 291         comedi_subdevice *write_subdev;
 292
 293         struct fasync_struct *async_queue;
 294
 295         void (*open) (comedi_device *dev);
 296         void (*close) (comedi_device *dev);
 297 };
 298
 299 struct comedi_device_file_info {
 300         comedi_device *device;
 301         comedi_subdevice *read_subdevice;
 302         comedi_subdevice *write_subdevice;
 303 };
 304
 305 #ifdef CONFIG_COMEDI_DEBUG
 306 extern int comedi_debug;
 307 #else
 308 static const int comedi_debug;
 309 #endif
 310
 311 /*
 312  * function prototypes
 313  */
 314
 315 void comedi_event(comedi_device *dev, comedi_subdevice *s);
 316 void comedi_error(const comedi_device *dev, const char *s);
 317
 318 /* we can expand the number of bits used to encode devices/subdevices into
 319  the minor number soon, after more distros support > 8 bit minor numbers
 320  (like after Debian Etch gets released) */
 321 enum comedi_minor_bits {
 322         COMEDI_DEVICE_MINOR_MASK = 0xf,
 323         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 324 };
 325 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 326 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 327
 328 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor);
 329
 330 static inline comedi_subdevice *comedi_get_read_subdevice(
 331                                 const struct comedi_device_file_info *info)
 332 {
 333         if (info->read_subdevice)
 334                 return info->read_subdevice;
 335         if (info->device == NULL)
 336                 return NULL;
 337         return info->device->read_subdev;
 338 }
 339
 340 static inline comedi_subdevice *comedi_get_write_subdevice(
 341                                 const struct comedi_device_file_info *info)
 342 {
 343         if (info->write_subdevice)
 344                 return info->write_subdevice;
 345         if (info->device == NULL)
 346                 return NULL;
 347         return info->device->write_subdev;
 348 }
 349
 350 void comedi_device_detach(comedi_device *dev);
 351 int comedi_device_attach(comedi_device *dev, comedi_devconfig *it);
 352 int comedi_driver_register(comedi_driver *);
 353 int comedi_driver_unregister(comedi_driver *);
 354
 355 void init_polling(void);
 356 void cleanup_polling(void);
 357 void start_polling(comedi_device *);
 358 void stop_polling(comedi_device *);
 359
 360 int comedi_buf_alloc(comedi_device *dev, comedi_subdevice *s, unsigned long
 361         new_size);
 362
 363 #ifdef CONFIG_PROC_FS
 364 void comedi_proc_init(void);
 365 void comedi_proc_cleanup(void);
 366 #else
 367 static inline void comedi_proc_init(void)
 368 {
 369 }
 370 static inline void comedi_proc_cleanup(void)
 371 {
 372 }
 373 #endif
 374
 375 /* subdevice runflags */
 376 enum subdevice_runflags {
 377         SRF_USER = 0x00000001,
 378         SRF_RT = 0x00000002,
 379         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 380          * command was started */
 381         SRF_ERROR = 0x00000004,
 382         SRF_RUNNING = 0x08000000
 383 };
 384
 385 /*
 386    various internal comedi functions
 387  */
 388
 389 int do_rangeinfo_ioctl(comedi_device *dev, comedi_rangeinfo *arg);
 390 int check_chanlist(comedi_subdevice *s, int n, unsigned int *chanlist);
 391 void comedi_set_subdevice_runflags(comedi_subdevice *s, unsigned mask,
 392         unsigned bits);
 393 unsigned comedi_get_subdevice_runflags(comedi_subdevice *s);
 394 int insn_inval(comedi_device *dev, comedi_subdevice *s,
 395         comedi_insn *insn, lsampl_t *data);
 396
 397 /* range stuff */
 398
 399 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 400 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 401 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 402 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}   /* XXX */
 403 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 404 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 405
 406 extern const comedi_lrange range_bipolar10;
 407 extern const comedi_lrange range_bipolar5;
 408 extern const comedi_lrange range_bipolar2_5;
 409 extern const comedi_lrange range_unipolar10;
 410 extern const comedi_lrange range_unipolar5;
 411 extern const comedi_lrange range_unknown;
 412
 413 #define range_digital           range_unipolar5
 414
 415 #if __GNUC__ >= 3
 416 #define GCC_ZERO_LENGTH_ARRAY
 417 #else
 418 #define GCC_ZERO_LENGTH_ARRAY 0
 419 #endif
 420
 421 struct comedi_lrange_struct {
 422         int length;
 423         comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 424 };
 425
 426 /* some silly little inline functions */
 427
 428 static inline int alloc_subdevices(comedi_device *dev,
 429                                    unsigned int num_subdevices)
 430 {
 431         unsigned i;
 432
 433         dev->n_subdevices = num_subdevices;
 434         dev->subdevices =
 435                 kcalloc(num_subdevices, sizeof(comedi_subdevice), GFP_KERNEL);
 436         if (!dev->subdevices)
 437                 return -ENOMEM;
 438         for (i = 0; i < num_subdevices; ++i) {
 439                 dev->subdevices[i].device = dev;
 440                 dev->subdevices[i].async_dma_dir = DMA_NONE;
 441                 spin_lock_init(&dev->subdevices[i].spin_lock);
 442                 dev->subdevices[i].minor = -1;
 443         }
 444         return 0;
 445 }
 446
 447 static inline int alloc_private(comedi_device *dev, int size)
 448 {
 449         dev->private = kzalloc(size, GFP_KERNEL);
 450         if (!dev->private)
 451                 return -ENOMEM;
 452         return 0;
 453 }
 454
 455 static inline unsigned int bytes_per_sample(const comedi_subdevice *subd)
 456 {
 457         if (subd->subdev_flags & SDF_LSAMPL)
 458                 return sizeof(lsampl_t);
 459         else
 460                 return sizeof(sampl_t);
 461 }
 462
 463 /* must be used in attach to set dev->hw_dev if you wish to dma directly
 464 into comedi's buffer */
 465 static inline void comedi_set_hw_dev(comedi_device *dev, struct device *hw_dev)
 466 {
 467         if (dev->hw_dev)
 468                 put_device(dev->hw_dev);
 469
 470         dev->hw_dev = hw_dev;
 471         if (dev->hw_dev) {
 472                 dev->hw_dev = get_device(dev->hw_dev);
 473                 BUG_ON(dev->hw_dev == NULL);
 474         }
 475 }
 476
 477 int comedi_buf_put(comedi_async *async, sampl_t x);
 478 int comedi_buf_get(comedi_async *async, sampl_t *x);
 479
 480 unsigned int comedi_buf_write_n_available(comedi_async *async);
 481 unsigned int comedi_buf_write_alloc(comedi_async *async, unsigned int nbytes);
 482 unsigned int comedi_buf_write_alloc_strict(comedi_async *async,
 483         unsigned int nbytes);
 484 unsigned comedi_buf_write_free(comedi_async *async, unsigned int nbytes);
 485 unsigned comedi_buf_read_alloc(comedi_async *async, unsigned nbytes);
 486 unsigned comedi_buf_read_free(comedi_async *async, unsigned int nbytes);
 487 unsigned int comedi_buf_read_n_available(comedi_async *async);
 488 void comedi_buf_memcpy_to(comedi_async *async, unsigned int offset,
 489         const void *source, unsigned int num_bytes);
 490 void comedi_buf_memcpy_from(comedi_async *async, unsigned int offset,
 491         void *destination, unsigned int num_bytes);
 492 static inline unsigned comedi_buf_write_n_allocated(comedi_async *async)
 493 {
 494         return async->buf_write_alloc_count - async->buf_write_count;
 495 }
 496 static inline unsigned comedi_buf_read_n_allocated(comedi_async *async)
 497 {
 498         return async->buf_read_alloc_count - async->buf_read_count;
 499 }
 500
 501 void comedi_reset_async_buf(comedi_async *async);
 502
 503 static inline void *comedi_aux_data(int options[], int n)
 504 {
 505         unsigned long address;
 506         unsigned long addressLow;
 507         int bit_shift;
 508         if (sizeof(int) >= sizeof(void *))
 509                 address = options[COMEDI_DEVCONF_AUX_DATA_LO];
 510         else {
 511                 address = options[COMEDI_DEVCONF_AUX_DATA_HI];
 512                 bit_shift = sizeof(int) * 8;
 513                 address <<= bit_shift;
 514                 addressLow = options[COMEDI_DEVCONF_AUX_DATA_LO];
 515                 addressLow &= (1UL << bit_shift) - 1;
 516                 address |= addressLow;
 517         }
 518         if (n >= 1)
 519                 address += options[COMEDI_DEVCONF_AUX_DATA0_LENGTH];
 520         if (n >= 2)
 521                 address += options[COMEDI_DEVCONF_AUX_DATA1_LENGTH];
 522         if (n >= 3)
 523                 address += options[COMEDI_DEVCONF_AUX_DATA2_LENGTH];
 524         BUG_ON(n > 3);
 525         return (void *)address;
 526 }
 527
 528 int comedi_alloc_board_minor(struct device *hardware_device);
 529 void comedi_free_board_minor(unsigned minor);
 530 int comedi_alloc_subdevice_minor(comedi_device *dev, comedi_subdevice *s);
 531 void comedi_free_subdevice_minor(comedi_subdevice *s);
 532 int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name);
 533 void comedi_pci_auto_unconfig(struct pci_dev *pcidev);
 534
 535 #include "comedi_rt.h"
 536
 537 #endif /* _COMEDIDEV_H */