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                 pr_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, \
  53         COMEDI_MINORVERSION, COMEDI_MICROVERSION)
  54 #define COMEDI_RELEASE VERSION
  55
  56 #define COMEDI_NUM_BOARD_MINORS 0x30
  57
  58 struct comedi_subdevice {
  59         struct comedi_device *device;
  60         int index;
  61         int type;
  62         int n_chan;
  63         int subdev_flags;
  64         int len_chanlist;       /* maximum length of channel/gain list */
  65
  66         void *private;
  67
  68         struct comedi_async *async;
  69
  70         void *lock;
  71         void *busy;
  72         unsigned runflags;
  73         spinlock_t spin_lock;
  74
  75         unsigned int io_bits;
  76
  77         unsigned int maxdata;   /* if maxdata==0, use list */
  78         const unsigned int *maxdata_list;       /* list is channel specific */
  79
  80         unsigned int flags;
  81         const unsigned int *flaglist;
  82
  83         unsigned int settling_time_0;
  84
  85         const struct comedi_lrange *range_table;
  86         const struct comedi_lrange *const *range_table_list;
  87
  88         unsigned int *chanlist; /* driver-owned chanlist (not used) */
  89
  90         int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
  91                           struct comedi_insn *, unsigned int *);
  92         int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
  93                            struct comedi_insn *, unsigned int *);
  94         int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
  95                           struct comedi_insn *, unsigned int *);
  96         int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
  97                             struct comedi_insn *, unsigned int *);
  98
  99         int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
 100         int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
 101                            struct comedi_cmd *);
 102         int (*poll) (struct comedi_device *, struct comedi_subdevice *);
 103         int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
 104         /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
 105         /* int (*do_unlock)(struct comedi_device *, \
 106                         struct comedi_subdevice *); */
 107
 108         /* called when the buffer changes */
 109         int (*buf_change) (struct comedi_device *dev,
 110                            struct comedi_subdevice *s, unsigned long new_size);
 111
 112         void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
 113                        void *data, unsigned int num_bytes,
 114                        unsigned int start_chan_index);
 115         enum dma_data_direction async_dma_dir;
 116
 117         unsigned int state;
 118
 119         struct device *class_dev;
 120         int minor;
 121 };
 122
 123 struct comedi_buf_page {
 124         void *virt_addr;
 125         dma_addr_t dma_addr;
 126 };
 127
 128 struct comedi_async {
 129         struct comedi_subdevice *subdevice;
 130
 131         void *prealloc_buf;     /* pre-allocated buffer */
 132         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 133         /* virtual and dma address of each page */
 134         struct comedi_buf_page *buf_page_list;
 135         unsigned n_buf_pages;   /* num elements in buf_page_list */
 136
 137         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 138         /* current number of mmaps of prealloc_buf */
 139         unsigned int mmap_count;
 140
 141         /* byte count for writer (write completed) */
 142         unsigned int buf_write_count;
 143         /* byte count for writer (allocated for writing) */
 144         unsigned int buf_write_alloc_count;
 145         /* byte count for reader (read completed) */
 146         unsigned int buf_read_count;
 147         /* byte count for reader (allocated for reading) */
 148         unsigned int buf_read_alloc_count;
 149
 150         unsigned int buf_write_ptr;     /* buffer marker for writer */
 151         unsigned int buf_read_ptr;      /* buffer marker for reader */
 152
 153         unsigned int cur_chan;  /* useless channel marker for interrupt */
 154         /* number of bytes that have been received for current scan */
 155         unsigned int scan_progress;
 156         /* keeps track of where we are in chanlist as for munging */
 157         unsigned int munge_chan;
 158         /* number of bytes that have been munged */
 159         unsigned int munge_count;
 160         /* buffer marker for munging */
 161         unsigned int munge_ptr;
 162
 163         unsigned int events;    /* events that have occurred */
 164
 165         struct comedi_cmd cmd;
 166
 167         wait_queue_head_t wait_head;
 168
 169         /* callback stuff */
 170         unsigned int cb_mask;
 171         int (*cb_func) (unsigned int flags, void *);
 172         void *cb_arg;
 173
 174         int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
 175                         unsigned int x);
 176 };
 177
 178 struct comedi_driver {
 179         struct comedi_driver *next;
 180
 181         const char *driver_name;
 182         struct module *module;
 183         int (*attach) (struct comedi_device *, struct comedi_devconfig *);
 184         void (*detach) (struct comedi_device *);
 185         int (*auto_attach) (struct comedi_device *, unsigned long);
 186
 187         /* number of elements in board_name and board_id arrays */
 188         unsigned int num_names;
 189         const char *const *board_name;
 190         /* offset in bytes from one board name pointer to the next */
 191         int offset;
 192 };
 193
 194 struct comedi_device {
 195         int use_count;
 196         struct comedi_driver *driver;
 197         void *private;
 198
 199         struct device *class_dev;
 200         int minor;
 201         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 202          * for subdevices that have async_dma_dir set to something other than
 203          * DMA_NONE */
 204         struct device *hw_dev;
 205
 206         const char *board_name;
 207         const void *board_ptr;
 208         bool attached:1;
 209         bool in_request_module:1;
 210         bool ioenabled:1;
 211         spinlock_t spinlock;
 212         struct mutex mutex;
 213
 214         int n_subdevices;
 215         struct comedi_subdevice *subdevices;
 216
 217         /* dumb */
 218         unsigned long iobase;
 219         unsigned int irq;
 220
 221         struct comedi_subdevice *read_subdev;
 222         struct comedi_subdevice *write_subdev;
 223
 224         struct fasync_struct *async_queue;
 225
 226         int (*open) (struct comedi_device *dev);
 227         void (*close) (struct comedi_device *dev);
 228 };
 229
 230 static inline const void *comedi_board(const struct comedi_device *dev)
 231 {
 232         return dev->board_ptr;
 233 }
 234
 235 #ifdef CONFIG_COMEDI_DEBUG
 236 extern int comedi_debug;
 237 #else
 238 static const int comedi_debug;
 239 #endif
 240
 241 /*
 242  * function prototypes
 243  */
 244
 245 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
 246 void comedi_error(const struct comedi_device *dev, const char *s);
 247
 248 /* we can expand the number of bits used to encode devices/subdevices into
 249  the minor number soon, after more distros support > 8 bit minor numbers
 250  (like after Debian Etch gets released) */
 251 enum comedi_minor_bits {
 252         COMEDI_DEVICE_MINOR_MASK = 0xf,
 253         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 254 };
 255 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 256 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 257
 258 struct comedi_device *comedi_dev_from_minor(unsigned minor);
 259
 260 void init_polling(void);
 261 void cleanup_polling(void);
 262 void start_polling(struct comedi_device *);
 263 void stop_polling(struct comedi_device *);
 264
 265 /* subdevice runflags */
 266 enum subdevice_runflags {
 267         SRF_USER = 0x00000001,
 268         SRF_RT = 0x00000002,
 269         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 270          * command was started */
 271         SRF_ERROR = 0x00000004,
 272         SRF_RUNNING = 0x08000000
 273 };
 274
 275 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
 276
 277 int comedi_check_chanlist(struct comedi_subdevice *s,
 278                           int n,
 279                           unsigned int *chanlist);
 280
 281 /* range stuff */
 282
 283 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 284 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 285 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 286 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}
 287 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 288 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 289
 290 extern const struct comedi_lrange range_bipolar10;
 291 extern const struct comedi_lrange range_bipolar5;
 292 extern const struct comedi_lrange range_bipolar2_5;
 293 extern const struct comedi_lrange range_unipolar10;
 294 extern const struct comedi_lrange range_unipolar5;
 295 extern const struct comedi_lrange range_unipolar2_5;
 296 extern const struct comedi_lrange range_0_20mA;
 297 extern const struct comedi_lrange range_4_20mA;
 298 extern const struct comedi_lrange range_0_32mA;
 299 extern const struct comedi_lrange range_unknown;
 300
 301 #define range_digital           range_unipolar5
 302
 303 #if __GNUC__ >= 3
 304 #define GCC_ZERO_LENGTH_ARRAY
 305 #else
 306 #define GCC_ZERO_LENGTH_ARRAY 0
 307 #endif
 308
 309 struct comedi_lrange {
 310         int length;
 311         struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 312 };
 313
 314 /* some silly little inline functions */
 315
 316 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
 317 {
 318         if (subd->subdev_flags & SDF_LSAMPL)
 319                 return sizeof(unsigned int);
 320         else
 321                 return sizeof(short);
 322 }
 323
 324 /*
 325  * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
 326  * Also useful for retrieving a previously configured hardware device of
 327  * known bus type.  Set automatically for auto-configured devices.
 328  * Automatically set to NULL when detaching hardware device.
 329  */
 330 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
 331
 332 unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
 333 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
 334
 335 unsigned int comedi_buf_read_n_available(struct comedi_async *);
 336 unsigned int comedi_buf_read_alloc(struct comedi_async *, unsigned int);
 337 unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
 338
 339 int comedi_buf_put(struct comedi_async *, short);
 340 int comedi_buf_get(struct comedi_async *, short *);
 341
 342 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
 343                           const void *source, unsigned int num_bytes);
 344 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 345                             void *destination, unsigned int num_bytes);
 346
 347 /* drivers.c - general comedi driver functions */
 348
 349 int comedi_alloc_subdevices(struct comedi_device *, int);
 350
 351 void comedi_spriv_free(struct comedi_device *, int subdev_num);
 352
 353 int __comedi_request_region(struct comedi_device *,
 354                             unsigned long start, unsigned long len);
 355 int comedi_request_region(struct comedi_device *,
 356                           unsigned long start, unsigned long len);
 357
 358 int comedi_auto_config(struct device *, struct comedi_driver *,
 359                        unsigned long context);
 360 void comedi_auto_unconfig(struct device *);
 361
 362 int comedi_driver_register(struct comedi_driver *);
 363 int comedi_driver_unregister(struct comedi_driver *);
 364
 365 /**
 366  * module_comedi_driver() - Helper macro for registering a comedi driver
 367  * @__comedi_driver: comedi_driver struct
 368  *
 369  * Helper macro for comedi drivers which do not do anything special in module
 370  * init/exit. This eliminates a lot of boilerplate. Each module may only use
 371  * this macro once, and calling it replaces module_init() and module_exit().
 372  */
 373 #define module_comedi_driver(__comedi_driver) \
 374         module_driver(__comedi_driver, comedi_driver_register, \
 375                         comedi_driver_unregister)
 376
 377 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 378
 379 /* comedi_pci.c - comedi PCI driver specific functions */
 380
 381 /*
 382  * PCI Vendor IDs not in <linux/pci_ids.h>
 383  */
 384 #define PCI_VENDOR_ID_KOLTER            0x1001
 385 #define PCI_VENDOR_ID_ICP               0x104c
 386 #define PCI_VENDOR_ID_AMCC              0x10e8
 387 #define PCI_VENDOR_ID_DT                0x1116
 388 #define PCI_VENDOR_ID_IOTECH            0x1616
 389 #define PCI_VENDOR_ID_CONTEC            0x1221
 390 #define PCI_VENDOR_ID_RTD               0x1435
 391
 392 struct pci_dev;
 393 struct pci_driver;
 394
 395 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
 396
 397 int comedi_pci_enable(struct comedi_device *);
 398 void comedi_pci_disable(struct comedi_device *);
 399
 400 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
 401                            unsigned long context);
 402 void comedi_pci_auto_unconfig(struct pci_dev *);
 403
 404 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
 405 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
 406
 407 /**
 408  * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
 409  * @__comedi_driver: comedi_driver struct
 410  * @__pci_driver: pci_driver struct
 411  *
 412  * Helper macro for comedi PCI drivers which do not do anything special
 413  * in module init/exit. This eliminates a lot of boilerplate. Each
 414  * module may only use this macro once, and calling it replaces
 415  * module_init() and module_exit()
 416  */
 417 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
 418         module_driver(__comedi_driver, comedi_pci_driver_register, \
 419                         comedi_pci_driver_unregister, &(__pci_driver))
 420
 421 #else
 422
 423 /*
 424  * Some of the comedi mixed ISA/PCI drivers call the PCI specific
 425  * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
 426  * is not enabled.
 427  */
 428
 429 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
 430 {
 431         return NULL;
 432 }
 433
 434 static inline int comedi_pci_enable(struct comedi_device *dev)
 435 {
 436         return -ENOSYS;
 437 }
 438
 439 static inline void comedi_pci_disable(struct comedi_device *dev)
 440 {
 441 }
 442
 443 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
 444
 445 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
 446
 447 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
 448
 449 struct pcmcia_driver;
 450 struct pcmcia_device;
 451
 452 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
 453
 454 int comedi_pcmcia_enable(struct comedi_device *,
 455                          int (*conf_check)(struct pcmcia_device *, void *));
 456 void comedi_pcmcia_disable(struct comedi_device *);
 457
 458 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
 459 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
 460
 461 int comedi_pcmcia_driver_register(struct comedi_driver *,
 462                                         struct pcmcia_driver *);
 463 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
 464                                         struct pcmcia_driver *);
 465
 466 /**
 467  * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
 468  * @__comedi_driver: comedi_driver struct
 469  * @__pcmcia_driver: pcmcia_driver struct
 470  *
 471  * Helper macro for comedi PCMCIA drivers which do not do anything special
 472  * in module init/exit. This eliminates a lot of boilerplate. Each
 473  * module may only use this macro once, and calling it replaces
 474  * module_init() and module_exit()
 475  */
 476 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
 477         module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
 478                         comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
 479
 480 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
 481
 482 #ifdef CONFIG_COMEDI_USB_DRIVERS
 483
 484 /* comedi_usb.c - comedi USB driver specific functions */
 485
 486 struct usb_driver;
 487 struct usb_interface;
 488
 489 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
 490
 491 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
 492                            unsigned long context);
 493 void comedi_usb_auto_unconfig(struct usb_interface *);
 494
 495 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
 496 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
 497
 498 /**
 499  * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
 500  * @__comedi_driver: comedi_driver struct
 501  * @__usb_driver: usb_driver struct
 502  *
 503  * Helper macro for comedi USB drivers which do not do anything special
 504  * in module init/exit. This eliminates a lot of boilerplate. Each
 505  * module may only use this macro once, and calling it replaces
 506  * module_init() and module_exit()
 507  */
 508 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
 509         module_driver(__comedi_driver, comedi_usb_driver_register, \
 510                         comedi_usb_driver_unregister, &(__usb_driver))
 511
 512 #endif /* CONFIG_COMEDI_USB_DRIVERS */
 513
 514 #endif /* _COMEDIDEV_H */