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_MINORS 0x100
  57 #define COMEDI_NUM_BOARD_MINORS 0x30
  58 #define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS
  59
  60 struct comedi_subdevice {
  61         struct comedi_device *device;
  62         int index;
  63         int type;
  64         int n_chan;
  65         int subdev_flags;
  66         int len_chanlist;       /* maximum length of channel/gain list */
  67
  68         void *private;
  69
  70         struct comedi_async *async;
  71
  72         void *lock;
  73         void *busy;
  74         unsigned runflags;
  75         spinlock_t spin_lock;
  76
  77         unsigned int io_bits;
  78
  79         unsigned int maxdata;   /* if maxdata==0, use list */
  80         const unsigned int *maxdata_list;       /* list is channel specific */
  81
  82         unsigned int flags;
  83         const unsigned int *flaglist;
  84
  85         unsigned int settling_time_0;
  86
  87         const struct comedi_lrange *range_table;
  88         const struct comedi_lrange *const *range_table_list;
  89
  90         unsigned int *chanlist; /* driver-owned chanlist (not used) */
  91
  92         int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
  93                           struct comedi_insn *, unsigned int *);
  94         int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
  95                            struct comedi_insn *, unsigned int *);
  96         int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
  97                           struct comedi_insn *, unsigned int *);
  98         int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
  99                             struct comedi_insn *, unsigned int *);
 100
 101         int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
 102         int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
 103                            struct comedi_cmd *);
 104         int (*poll) (struct comedi_device *, struct comedi_subdevice *);
 105         int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
 106         /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
 107         /* int (*do_unlock)(struct comedi_device *, \
 108                         struct comedi_subdevice *); */
 109
 110         /* called when the buffer changes */
 111         int (*buf_change) (struct comedi_device *dev,
 112                            struct comedi_subdevice *s, unsigned long new_size);
 113
 114         void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
 115                        void *data, unsigned int num_bytes,
 116                        unsigned int start_chan_index);
 117         enum dma_data_direction async_dma_dir;
 118
 119         unsigned int state;
 120
 121         struct device *class_dev;
 122         int minor;
 123 };
 124
 125 struct comedi_buf_page {
 126         void *virt_addr;
 127         dma_addr_t dma_addr;
 128 };
 129
 130 struct comedi_async {
 131         struct comedi_subdevice *subdevice;
 132
 133         void *prealloc_buf;     /* pre-allocated buffer */
 134         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 135         /* virtual and dma address of each page */
 136         struct comedi_buf_page *buf_page_list;
 137         unsigned n_buf_pages;   /* num elements in buf_page_list */
 138
 139         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 140         /* current number of mmaps of prealloc_buf */
 141         unsigned int mmap_count;
 142
 143         /* byte count for writer (write completed) */
 144         unsigned int buf_write_count;
 145         /* byte count for writer (allocated for writing) */
 146         unsigned int buf_write_alloc_count;
 147         /* byte count for reader (read completed) */
 148         unsigned int buf_read_count;
 149         /* byte count for reader (allocated for reading) */
 150         unsigned int buf_read_alloc_count;
 151
 152         unsigned int buf_write_ptr;     /* buffer marker for writer */
 153         unsigned int buf_read_ptr;      /* buffer marker for reader */
 154
 155         unsigned int cur_chan;  /* useless channel marker for interrupt */
 156         /* number of bytes that have been received for current scan */
 157         unsigned int scan_progress;
 158         /* keeps track of where we are in chanlist as for munging */
 159         unsigned int munge_chan;
 160         /* number of bytes that have been munged */
 161         unsigned int munge_count;
 162         /* buffer marker for munging */
 163         unsigned int munge_ptr;
 164
 165         unsigned int events;    /* events that have occurred */
 166
 167         struct comedi_cmd cmd;
 168
 169         wait_queue_head_t wait_head;
 170
 171         /* callback stuff */
 172         unsigned int cb_mask;
 173         int (*cb_func) (unsigned int flags, void *);
 174         void *cb_arg;
 175
 176         int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
 177                         unsigned int x);
 178 };
 179
 180 struct comedi_driver {
 181         struct comedi_driver *next;
 182
 183         const char *driver_name;
 184         struct module *module;
 185         int (*attach) (struct comedi_device *, struct comedi_devconfig *);
 186         void (*detach) (struct comedi_device *);
 187         int (*auto_attach) (struct comedi_device *, unsigned long);
 188
 189         /* number of elements in board_name and board_id arrays */
 190         unsigned int num_names;
 191         const char *const *board_name;
 192         /* offset in bytes from one board name pointer to the next */
 193         int offset;
 194 };
 195
 196 struct comedi_device {
 197         int use_count;
 198         struct comedi_driver *driver;
 199         void *private;
 200
 201         struct device *class_dev;
 202         int minor;
 203         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 204          * for subdevices that have async_dma_dir set to something other than
 205          * DMA_NONE */
 206         struct device *hw_dev;
 207
 208         const char *board_name;
 209         const void *board_ptr;
 210         int attached;
 211         spinlock_t spinlock;
 212         struct mutex mutex;
 213         int in_request_module;
 214
 215         int n_subdevices;
 216         struct comedi_subdevice *subdevices;
 217
 218         /* dumb */
 219         unsigned long iobase;
 220         unsigned int irq;
 221
 222         struct comedi_subdevice *read_subdev;
 223         struct comedi_subdevice *write_subdev;
 224
 225         struct fasync_struct *async_queue;
 226
 227         int (*open) (struct comedi_device *dev);
 228         void (*close) (struct comedi_device *dev);
 229 };
 230
 231 static inline const void *comedi_board(const struct comedi_device *dev)
 232 {
 233         return dev->board_ptr;
 234 }
 235
 236 #ifdef CONFIG_COMEDI_DEBUG
 237 extern int comedi_debug;
 238 #else
 239 static const int comedi_debug;
 240 #endif
 241
 242 /*
 243  * function prototypes
 244  */
 245
 246 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
 247 void comedi_error(const struct comedi_device *dev, const char *s);
 248
 249 /* we can expand the number of bits used to encode devices/subdevices into
 250  the minor number soon, after more distros support > 8 bit minor numbers
 251  (like after Debian Etch gets released) */
 252 enum comedi_minor_bits {
 253         COMEDI_DEVICE_MINOR_MASK = 0xf,
 254         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 255 };
 256 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 257 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 258
 259 struct comedi_device *comedi_dev_from_minor(unsigned minor);
 260
 261 void init_polling(void);
 262 void cleanup_polling(void);
 263 void start_polling(struct comedi_device *);
 264 void stop_polling(struct comedi_device *);
 265
 266 /* subdevice runflags */
 267 enum subdevice_runflags {
 268         SRF_USER = 0x00000001,
 269         SRF_RT = 0x00000002,
 270         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 271          * command was started */
 272         SRF_ERROR = 0x00000004,
 273         SRF_RUNNING = 0x08000000
 274 };
 275
 276 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
 277
 278 int comedi_check_chanlist(struct comedi_subdevice *s,
 279                           int n,
 280                           unsigned int *chanlist);
 281
 282 /* range stuff */
 283
 284 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 285 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 286 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 287 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}
 288 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 289 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 290
 291 extern const struct comedi_lrange range_bipolar10;
 292 extern const struct comedi_lrange range_bipolar5;
 293 extern const struct comedi_lrange range_bipolar2_5;
 294 extern const struct comedi_lrange range_unipolar10;
 295 extern const struct comedi_lrange range_unipolar5;
 296 extern const struct comedi_lrange range_unknown;
 297
 298 #define range_digital           range_unipolar5
 299
 300 #if __GNUC__ >= 3
 301 #define GCC_ZERO_LENGTH_ARRAY
 302 #else
 303 #define GCC_ZERO_LENGTH_ARRAY 0
 304 #endif
 305
 306 struct comedi_lrange {
 307         int length;
 308         struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 309 };
 310
 311 /* some silly little inline functions */
 312
 313 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
 314 {
 315         if (subd->subdev_flags & SDF_LSAMPL)
 316                 return sizeof(unsigned int);
 317         else
 318                 return sizeof(short);
 319 }
 320
 321 /*
 322  * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
 323  * Also useful for retrieving a previously configured hardware device of
 324  * known bus type.  Set automatically for auto-configured devices.
 325  * Automatically set to NULL when detaching hardware device.
 326  */
 327 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
 328
 329 unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
 330 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
 331
 332 unsigned int comedi_buf_read_n_available(struct comedi_async *);
 333 unsigned int comedi_buf_read_alloc(struct comedi_async *, unsigned int);
 334 unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
 335
 336 int comedi_buf_put(struct comedi_async *, short);
 337 int comedi_buf_get(struct comedi_async *, short *);
 338
 339 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
 340                           const void *source, unsigned int num_bytes);
 341 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 342                             void *destination, unsigned int num_bytes);
 343
 344 /* drivers.c - general comedi driver functions */
 345
 346 int comedi_alloc_subdevices(struct comedi_device *, int);
 347
 348 int comedi_auto_config(struct device *, struct comedi_driver *,
 349                        unsigned long context);
 350 void comedi_auto_unconfig(struct device *);
 351
 352 int comedi_driver_register(struct comedi_driver *);
 353 int comedi_driver_unregister(struct comedi_driver *);
 354
 355 /**
 356  * module_comedi_driver() - Helper macro for registering a comedi driver
 357  * @__comedi_driver: comedi_driver struct
 358  *
 359  * Helper macro for comedi drivers which do not do anything special in module
 360  * init/exit. This eliminates a lot of boilerplate. Each module may only use
 361  * this macro once, and calling it replaces module_init() and module_exit().
 362  */
 363 #define module_comedi_driver(__comedi_driver) \
 364         module_driver(__comedi_driver, comedi_driver_register, \
 365                         comedi_driver_unregister)
 366
 367 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 368
 369 /* comedi_pci.c - comedi PCI driver specific functions */
 370
 371 /*
 372  * PCI Vendor IDs not in <linux/pci_ids.h>
 373  */
 374 #define PCI_VENDOR_ID_KOLTER            0x1001
 375 #define PCI_VENDOR_ID_ICP               0x104c
 376 #define PCI_VENDOR_ID_AMCC              0x10e8
 377 #define PCI_VENDOR_ID_DT                0x1116
 378 #define PCI_VENDOR_ID_IOTECH            0x1616
 379 #define PCI_VENDOR_ID_CONTEC            0x1221
 380 #define PCI_VENDOR_ID_RTD               0x1435
 381
 382 struct pci_dev;
 383 struct pci_driver;
 384
 385 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
 386
 387 int comedi_pci_enable(struct pci_dev *, const char *);
 388 void comedi_pci_disable(struct pci_dev *);
 389
 390 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *);
 391 void comedi_pci_auto_unconfig(struct pci_dev *);
 392
 393 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
 394 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
 395
 396 /**
 397  * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
 398  * @__comedi_driver: comedi_driver struct
 399  * @__pci_driver: pci_driver struct
 400  *
 401  * Helper macro for comedi PCI drivers which do not do anything special
 402  * in module init/exit. This eliminates a lot of boilerplate. Each
 403  * module may only use this macro once, and calling it replaces
 404  * module_init() and module_exit()
 405  */
 406 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
 407         module_driver(__comedi_driver, comedi_pci_driver_register, \
 408                         comedi_pci_driver_unregister, &(__pci_driver))
 409
 410 #else
 411
 412 /*
 413  * Some of the comedi mixed ISA/PCI drivers call the PCI specific
 414  * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
 415  * is not enabled.
 416  */
 417
 418 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
 419 {
 420         return NULL;
 421 }
 422
 423 static inline int comedi_pci_enable(struct pci_dev *dev, const char *name)
 424 {
 425         return -ENOSYS;
 426 }
 427
 428 static inline void comedi_pci_disable(struct pci_dev *dev)
 429 {
 430 }
 431
 432 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
 433
 434 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
 435
 436 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
 437
 438 struct pcmcia_driver;
 439 struct pcmcia_device;
 440
 441 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
 442
 443 int comedi_pcmcia_enable(struct comedi_device *,
 444                          int (*conf_check)(struct pcmcia_device *, void *));
 445 void comedi_pcmcia_disable(struct comedi_device *);
 446
 447 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
 448 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
 449
 450 int comedi_pcmcia_driver_register(struct comedi_driver *,
 451                                         struct pcmcia_driver *);
 452 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
 453                                         struct pcmcia_driver *);
 454
 455 /**
 456  * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
 457  * @__comedi_driver: comedi_driver struct
 458  * @__pcmcia_driver: pcmcia_driver struct
 459  *
 460  * Helper macro for comedi PCMCIA drivers which do not do anything special
 461  * in module init/exit. This eliminates a lot of boilerplate. Each
 462  * module may only use this macro once, and calling it replaces
 463  * module_init() and module_exit()
 464  */
 465 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
 466         module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
 467                         comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
 468
 469 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
 470
 471 #ifdef CONFIG_COMEDI_USB_DRIVERS
 472
 473 /* comedi_usb.c - comedi USB driver specific functions */
 474
 475 struct usb_driver;
 476 struct usb_interface;
 477
 478 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
 479
 480 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
 481                            unsigned long context);
 482 void comedi_usb_auto_unconfig(struct usb_interface *);
 483
 484 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
 485 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
 486
 487 /**
 488  * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
 489  * @__comedi_driver: comedi_driver struct
 490  * @__usb_driver: usb_driver struct
 491  *
 492  * Helper macro for comedi USB drivers which do not do anything special
 493  * in module init/exit. This eliminates a lot of boilerplate. Each
 494  * module may only use this macro once, and calling it replaces
 495  * module_init() and module_exit()
 496  */
 497 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
 498         module_driver(__comedi_driver, comedi_usb_driver_register, \
 499                         comedi_usb_driver_unregister, &(__usb_driver))
 500
 501 #endif /* CONFIG_COMEDI_USB_DRIVERS */
 502
 503 #endif /* _COMEDIDEV_H */