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