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/kdev_t.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.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/dma-mapping.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/io.h>
  42 #include <linux/timer.h>
  43
  44 #include "comedi.h"
  45
  46 #define DPRINTK(format, args...)        do {            \
  47         if (comedi_debug)                               \
  48                 printk(KERN_DEBUG "comedi: " format , ## args); \
  49 } while (0)
  50
  51 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
  52 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, COMEDI_MINORVERSION, COMEDI_MICROVERSION)
  53 #define COMEDI_RELEASE VERSION
  54
  55 #define COMEDI_INITCLEANUP_NOMODULE(x)                                  \
  56         static int __init x ## _init_module(void)                       \
  57                 {return comedi_driver_register(&(x)); }                 \
  58         static void __exit x ## _cleanup_module(void)                   \
  59                 {comedi_driver_unregister(&(x)); }                      \
  60         module_init(x ## _init_module);                                 \
  61         module_exit(x ## _cleanup_module);                                      \
  62
  63 #define COMEDI_MODULE_MACROS                                            \
  64         MODULE_AUTHOR("Comedi http://www.comedi.org");          \
  65         MODULE_DESCRIPTION("Comedi low-level driver");                  \
  66         MODULE_LICENSE("GPL");                                          \
  67
  68 #define COMEDI_INITCLEANUP(x)                                           \
  69         COMEDI_MODULE_MACROS            \
  70         COMEDI_INITCLEANUP_NOMODULE(x)
  71
  72 #define COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table) \
  73         static int __devinit comedi_driver ## _pci_probe(struct pci_dev *dev, \
  74                 const struct pci_device_id *ent) \
  75         { \
  76                 return comedi_pci_auto_config(dev, comedi_driver.driver_name); \
  77         } \
  78         static void __devexit comedi_driver ## _pci_remove(struct pci_dev *dev) \
  79         { \
  80                 comedi_pci_auto_unconfig(dev); \
  81         } \
  82         static struct pci_driver comedi_driver ## _pci_driver = \
  83         { \
  84                 .id_table = pci_id_table, \
  85                 .probe = &comedi_driver ## _pci_probe, \
  86                 .remove = __devexit_p(&comedi_driver ## _pci_remove) \
  87         }; \
  88         static int __init comedi_driver ## _init_module(void) \
  89         { \
  90                 int retval; \
  91                 retval = comedi_driver_register(&comedi_driver); \
  92                 if (retval < 0) \
  93                         return retval; \
  94                 comedi_driver ## _pci_driver.name = (char *)comedi_driver.driver_name; \
  95                 return pci_register_driver(&comedi_driver ## _pci_driver); \
  96         } \
  97         static void __exit comedi_driver ## _cleanup_module(void) \
  98         { \
  99                 pci_unregister_driver(&comedi_driver ## _pci_driver); \
 100                 comedi_driver_unregister(&comedi_driver); \
 101         } \
 102         module_init(comedi_driver ## _init_module); \
 103         module_exit(comedi_driver ## _cleanup_module);
 104
 105 #define COMEDI_PCI_INITCLEANUP(comedi_driver, pci_id_table) \
 106         COMEDI_MODULE_MACROS \
 107         COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table)
 108
 109 #define PCI_VENDOR_ID_INOVA             0x104c
 110 #define PCI_VENDOR_ID_NATINST           0x1093
 111 #define PCI_VENDOR_ID_DATX              0x1116
 112 #define PCI_VENDOR_ID_COMPUTERBOARDS    0x1307
 113 #define PCI_VENDOR_ID_ADVANTECH         0x13fe
 114 #define PCI_VENDOR_ID_RTD               0x1435
 115 #define PCI_VENDOR_ID_AMPLICON          0x14dc
 116 #define PCI_VENDOR_ID_ADLINK            0x144a
 117 #define PCI_VENDOR_ID_ICP               0x104c
 118 #define PCI_VENDOR_ID_CONTEC            0x1221
 119 #define PCI_VENDOR_ID_MEILHAUS          0x1402
 120
 121 #define COMEDI_NUM_MINORS 0x100
 122 #define COMEDI_NUM_BOARD_MINORS 0x30
 123 #define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS
 124
 125 #define COMEDI_DEVICE_CREATE(cs, parent, devt, drvdata, device, fmt...) \
 126         device_create(cs, ((parent) ? (parent) : (device)), devt, drvdata, fmt)
 127
 128 struct comedi_subdevice {
 129         struct comedi_device *device;
 130         int type;
 131         int n_chan;
 132         volatile int subdev_flags;
 133         int len_chanlist;       /* maximum length of channel/gain list */
 134
 135         void *private;
 136
 137         struct comedi_async *async;
 138
 139         void *lock;
 140         void *busy;
 141         unsigned runflags;
 142         spinlock_t spin_lock;
 143
 144         int io_bits;
 145
 146         unsigned int maxdata;   /* if maxdata==0, use list */
 147         const unsigned int *maxdata_list;       /* list is channel specific */
 148
 149         unsigned int flags;
 150         const unsigned int *flaglist;
 151
 152         unsigned int settling_time_0;
 153
 154         const struct comedi_lrange *range_table;
 155         const struct comedi_lrange *const *range_table_list;
 156
 157         unsigned int *chanlist; /* driver-owned chanlist (not used) */
 158
 159         int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
 160                           struct comedi_insn *, unsigned int *);
 161         int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
 162                            struct comedi_insn *, unsigned int *);
 163         int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
 164                           struct comedi_insn *, unsigned int *);
 165         int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
 166                             struct comedi_insn *, unsigned int *);
 167
 168         int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
 169         int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
 170                            struct comedi_cmd *);
 171         int (*poll) (struct comedi_device *, struct comedi_subdevice *);
 172         int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
 173         /* int (*do_lock)(struct comedi_device *,struct comedi_subdevice *); */
 174         /* int (*do_unlock)(struct comedi_device *,struct comedi_subdevice *); */
 175
 176         /* called when the buffer changes */
 177         int (*buf_change) (struct comedi_device * dev,
 178                            struct comedi_subdevice * s, unsigned long new_size);
 179
 180         void (*munge) (struct comedi_device * dev, struct comedi_subdevice * s,
 181                        void *data, unsigned int num_bytes,
 182                        unsigned int start_chan_index);
 183         enum dma_data_direction async_dma_dir;
 184
 185         unsigned int state;
 186
 187         struct device *class_dev;
 188         int minor;
 189 };
 190
 191 struct comedi_buf_page {
 192         void *virt_addr;
 193         dma_addr_t dma_addr;
 194 };
 195
 196 struct comedi_async {
 197         struct comedi_subdevice *subdevice;
 198
 199         void *prealloc_buf;     /* pre-allocated buffer */
 200         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 201         struct comedi_buf_page *buf_page_list;  /* virtual and dma address of each page */
 202         unsigned n_buf_pages;   /* num elements in buf_page_list */
 203
 204         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 205         unsigned int mmap_count;        /* current number of mmaps of prealloc_buf */
 206
 207         unsigned int buf_write_count;   /* byte count for writer (write completed) */
 208         unsigned int buf_write_alloc_count;     /* byte count for writer (allocated for writing) */
 209         unsigned int buf_read_count;    /* byte count for reader (read completed) */
 210         unsigned int buf_read_alloc_count;      /* byte count for reader (allocated for reading) */
 211
 212         unsigned int buf_write_ptr;     /* buffer marker for writer */
 213         unsigned int buf_read_ptr;      /* buffer marker for reader */
 214
 215         unsigned int cur_chan;  /* useless channel marker for interrupt */
 216         /* number of bytes that have been received for current scan */
 217         unsigned int scan_progress;
 218         /* keeps track of where we are in chanlist as for munging */
 219         unsigned int munge_chan;
 220         /* number of bytes that have been munged */
 221         unsigned int munge_count;
 222         /* buffer marker for munging */
 223         unsigned int munge_ptr;
 224
 225         unsigned int events;    /* events that have occurred */
 226
 227         struct comedi_cmd cmd;
 228
 229         wait_queue_head_t wait_head;
 230
 231         /* callback stuff */
 232         unsigned int cb_mask;
 233         int (*cb_func) (unsigned int flags, void *);
 234         void *cb_arg;
 235
 236         int (*inttrig) (struct comedi_device * dev, struct comedi_subdevice * s,
 237                         unsigned int x);
 238 };
 239
 240 struct comedi_driver {
 241         struct comedi_driver *next;
 242
 243         const char *driver_name;
 244         struct module *module;
 245         int (*attach) (struct comedi_device *, struct comedi_devconfig *);
 246         int (*detach) (struct comedi_device *);
 247
 248         /* number of elements in board_name and board_id arrays */
 249         unsigned int num_names;
 250         const char *const *board_name;
 251         /* offset in bytes from one board name pointer to the next */
 252         int offset;
 253 };
 254
 255 struct comedi_device {
 256         int use_count;
 257         struct comedi_driver *driver;
 258         void *private;
 259
 260         struct device *class_dev;
 261         int minor;
 262         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 263          * for subdevices that have async_dma_dir set to something other than
 264          * DMA_NONE */
 265         struct device *hw_dev;
 266
 267         const char *board_name;
 268         const void *board_ptr;
 269         int attached;
 270         spinlock_t spinlock;
 271         struct mutex mutex;
 272         int in_request_module;
 273
 274         int n_subdevices;
 275         struct comedi_subdevice *subdevices;
 276
 277         /* dumb */
 278         unsigned long iobase;
 279         unsigned int irq;
 280
 281         struct comedi_subdevice *read_subdev;
 282         struct comedi_subdevice *write_subdev;
 283
 284         struct fasync_struct *async_queue;
 285
 286         void (*open) (struct comedi_device * dev);
 287         void (*close) (struct comedi_device * dev);
 288 };
 289
 290 struct comedi_device_file_info {
 291         struct comedi_device *device;
 292         struct comedi_subdevice *read_subdevice;
 293         struct comedi_subdevice *write_subdevice;
 294 };
 295
 296 #ifdef CONFIG_COMEDI_DEBUG
 297 extern int comedi_debug;
 298 #else
 299 static const int comedi_debug;
 300 #endif
 301
 302 /*
 303  * function prototypes
 304  */
 305
 306 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
 307 void comedi_error(const struct comedi_device *dev, const char *s);
 308
 309 /* we can expand the number of bits used to encode devices/subdevices into
 310  the minor number soon, after more distros support > 8 bit minor numbers
 311  (like after Debian Etch gets released) */
 312 enum comedi_minor_bits {
 313         COMEDI_DEVICE_MINOR_MASK = 0xf,
 314         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 315 };
 316 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 317 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 318
 319 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor);
 320
 321 static inline struct comedi_subdevice *comedi_get_read_subdevice(const struct
 322                                                                  comedi_device_file_info
 323                                                                  *info)
 324 {
 325         if (info->read_subdevice)
 326                 return info->read_subdevice;
 327         if (info->device == NULL)
 328                 return NULL;
 329         return info->device->read_subdev;
 330 }
 331
 332 static inline struct comedi_subdevice *comedi_get_write_subdevice(const struct
 333                                                                   comedi_device_file_info
 334                                                                   *info)
 335 {
 336         if (info->write_subdevice)
 337                 return info->write_subdevice;
 338         if (info->device == NULL)
 339                 return NULL;
 340         return info->device->write_subdev;
 341 }
 342
 343 void comedi_device_detach(struct comedi_device *dev);
 344 int comedi_device_attach(struct comedi_device *dev,
 345                          struct comedi_devconfig *it);
 346 int comedi_driver_register(struct comedi_driver *);
 347 int comedi_driver_unregister(struct comedi_driver *);
 348
 349 void init_polling(void);
 350 void cleanup_polling(void);
 351 void start_polling(struct comedi_device *);
 352 void stop_polling(struct comedi_device *);
 353
 354 int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
 355                      unsigned long new_size);
 356
 357 #ifdef CONFIG_PROC_FS
 358 void comedi_proc_init(void);
 359 void comedi_proc_cleanup(void);
 360 #else
 361 static inline void comedi_proc_init(void)
 362 {
 363 }
 364
 365 static inline void comedi_proc_cleanup(void)
 366 {
 367 }
 368 #endif
 369
 370 /* subdevice runflags */
 371 enum subdevice_runflags {
 372         SRF_USER = 0x00000001,
 373         SRF_RT = 0x00000002,
 374         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 375          * command was started */
 376         SRF_ERROR = 0x00000004,
 377         SRF_RUNNING = 0x08000000
 378 };
 379
 380 /*
 381    various internal comedi functions
 382  */
 383
 384 int do_rangeinfo_ioctl(struct comedi_device *dev, struct comedi_rangeinfo *arg);
 385 int check_chanlist(struct comedi_subdevice *s, int n, unsigned int *chanlist);
 386 void comedi_set_subdevice_runflags(struct comedi_subdevice *s, unsigned mask,
 387                                    unsigned bits);
 388 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s);
 389 int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
 390                struct comedi_insn *insn, unsigned int *data);
 391
 392 /* range stuff */
 393
 394 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 395 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 396 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 397 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}   /* XXX */
 398 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 399 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 400
 401 extern const struct comedi_lrange range_bipolar10;
 402 extern const struct comedi_lrange range_bipolar5;
 403 extern const struct comedi_lrange range_bipolar2_5;
 404 extern const struct comedi_lrange range_unipolar10;
 405 extern const struct comedi_lrange range_unipolar5;
 406 extern const struct comedi_lrange range_unknown;
 407
 408 #define range_digital           range_unipolar5
 409
 410 #if __GNUC__ >= 3
 411 #define GCC_ZERO_LENGTH_ARRAY
 412 #else
 413 #define GCC_ZERO_LENGTH_ARRAY 0
 414 #endif
 415
 416 struct comedi_lrange {
 417         int length;
 418         struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 419 };
 420
 421 /* some silly little inline functions */
 422
 423 static inline int alloc_subdevices(struct comedi_device *dev,
 424                                    unsigned int num_subdevices)
 425 {
 426         unsigned i;
 427
 428         dev->n_subdevices = num_subdevices;
 429         dev->subdevices =
 430             kcalloc(num_subdevices, sizeof(struct comedi_subdevice),
 431                     GFP_KERNEL);
 432         if (!dev->subdevices)
 433                 return -ENOMEM;
 434         for (i = 0; i < num_subdevices; ++i) {
 435                 dev->subdevices[i].device = dev;
 436                 dev->subdevices[i].async_dma_dir = DMA_NONE;
 437                 spin_lock_init(&dev->subdevices[i].spin_lock);
 438                 dev->subdevices[i].minor = -1;
 439         }
 440         return 0;
 441 }
 442
 443 static inline int alloc_private(struct comedi_device *dev, int size)
 444 {
 445         dev->private = kzalloc(size, GFP_KERNEL);
 446         if (!dev->private)
 447                 return -ENOMEM;
 448         return 0;
 449 }
 450
 451 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
 452 {
 453         if (subd->subdev_flags & SDF_LSAMPL)
 454                 return sizeof(unsigned int);
 455         else
 456                 return sizeof(short);
 457 }
 458
 459 /* must be used in attach to set dev->hw_dev if you wish to dma directly
 460 into comedi's buffer */
 461 static inline void comedi_set_hw_dev(struct comedi_device *dev,
 462                                      struct device *hw_dev)
 463 {
 464         if (dev->hw_dev)
 465                 put_device(dev->hw_dev);
 466
 467         dev->hw_dev = hw_dev;
 468         if (dev->hw_dev) {
 469                 dev->hw_dev = get_device(dev->hw_dev);
 470                 BUG_ON(dev->hw_dev == NULL);
 471         }
 472 }
 473
 474 int comedi_buf_put(struct comedi_async *async, short x);
 475 int comedi_buf_get(struct comedi_async *async, short *x);
 476
 477 unsigned int comedi_buf_write_n_available(struct comedi_async *async);
 478 unsigned int comedi_buf_write_alloc(struct comedi_async *async,
 479                                     unsigned int nbytes);
 480 unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async,
 481                                            unsigned int nbytes);
 482 unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes);
 483 unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes);
 484 unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes);
 485 unsigned int comedi_buf_read_n_available(struct comedi_async *async);
 486 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
 487                           const void *source, unsigned int num_bytes);
 488 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 489                             void *destination, unsigned int num_bytes);
 490 static inline unsigned comedi_buf_write_n_allocated(struct comedi_async *async)
 491 {
 492         return async->buf_write_alloc_count - async->buf_write_count;
 493 }
 494
 495 static inline unsigned comedi_buf_read_n_allocated(struct comedi_async *async)
 496 {
 497         return async->buf_read_alloc_count - async->buf_read_count;
 498 }
 499
 500 void comedi_reset_async_buf(struct comedi_async *async);
 501
 502 static inline void *comedi_aux_data(int options[], int n)
 503 {
 504         unsigned long address;
 505         unsigned long addressLow;
 506         int bit_shift;
 507         if (sizeof(int) >= sizeof(void *))
 508                 address = options[COMEDI_DEVCONF_AUX_DATA_LO];
 509         else {
 510                 address = options[COMEDI_DEVCONF_AUX_DATA_HI];
 511                 bit_shift = sizeof(int) * 8;
 512                 address <<= bit_shift;
 513                 addressLow = options[COMEDI_DEVCONF_AUX_DATA_LO];
 514                 addressLow &= (1UL << bit_shift) - 1;
 515                 address |= addressLow;
 516         }
 517         if (n >= 1)
 518                 address += options[COMEDI_DEVCONF_AUX_DATA0_LENGTH];
 519         if (n >= 2)
 520                 address += options[COMEDI_DEVCONF_AUX_DATA1_LENGTH];
 521         if (n >= 3)
 522                 address += options[COMEDI_DEVCONF_AUX_DATA2_LENGTH];
 523         BUG_ON(n > 3);
 524         return (void *)address;
 525 }
 526
 527 int comedi_alloc_board_minor(struct device *hardware_device);
 528 void comedi_free_board_minor(unsigned minor);
 529 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
 530                                  struct comedi_subdevice *s);
 531 void comedi_free_subdevice_minor(struct 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 struct usb_device;              /* forward declaration */
 535 int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name);
 536 void comedi_usb_auto_unconfig(struct usb_device *usbdev);
 537
 538 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 539 #define CONFIG_COMEDI_PCI
 540 #endif
 541 #ifdef CONFIG_COMEDI_PCI_DRIVERS_MODULE
 542 #define CONFIG_COMEDI_PCI
 543 #endif
 544 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
 545 #define CONFIG_COMEDI_PCMCIA
 546 #endif
 547 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS_MODULE
 548 #define CONFIG_COMEDI_PCMCIA
 549 #endif
 550
 551 #endif /* _COMEDIDEV_H */