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 #include <linux/usb.h>
  45
  46 #include "comedi.h"
  47
  48 #define DPRINTK(format, args...)        do {            \
  49         if (comedi_debug)                               \
  50                 pr_debug("comedi: " format, ## args);   \
  51 } while (0)
  52
  53 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
  54 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
  55         COMEDI_MINORVERSION, COMEDI_MICROVERSION)
  56 #define COMEDI_RELEASE VERSION
  57
  58 /*
  59  * PCI Vendor IDs not in <linux/pci_ids.h>
  60  */
  61 #define PCI_VENDOR_ID_KOLTER            0x1001
  62 #define PCI_VENDOR_ID_ICP               0x104c
  63 #define PCI_VENDOR_ID_AMCC              0x10e8
  64 #define PCI_VENDOR_ID_DT                0x1116
  65 #define PCI_VENDOR_ID_IOTECH            0x1616
  66 #define PCI_VENDOR_ID_CONTEC            0x1221
  67 #define PCI_VENDOR_ID_CB                0x1307  /* Measurement Computing */
  68 #define PCI_VENDOR_ID_ADVANTECH         0x13fe
  69 #define PCI_VENDOR_ID_MEILHAUS          0x1402
  70 #define PCI_VENDOR_ID_RTD               0x1435
  71 #define PCI_VENDOR_ID_ADLINK            0x144a
  72 #define PCI_VENDOR_ID_AMPLICON          0x14dc
  73
  74 #define COMEDI_NUM_MINORS 0x100
  75 #define COMEDI_NUM_BOARD_MINORS 0x30
  76 #define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS
  77
  78 struct comedi_subdevice {
  79         struct comedi_device *device;
  80         int index;
  81         int type;
  82         int n_chan;
  83         int subdev_flags;
  84         int len_chanlist;       /* maximum length of channel/gain list */
  85
  86         void *private;
  87
  88         struct comedi_async *async;
  89
  90         void *lock;
  91         void *busy;
  92         unsigned runflags;
  93         spinlock_t spin_lock;
  94
  95         unsigned int io_bits;
  96
  97         unsigned int maxdata;   /* if maxdata==0, use list */
  98         const unsigned int *maxdata_list;       /* list is channel specific */
  99
 100         unsigned int flags;
 101         const unsigned int *flaglist;
 102
 103         unsigned int settling_time_0;
 104
 105         const struct comedi_lrange *range_table;
 106         const struct comedi_lrange *const *range_table_list;
 107
 108         unsigned int *chanlist; /* driver-owned chanlist (not used) */
 109
 110         int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
 111                           struct comedi_insn *, unsigned int *);
 112         int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
 113                            struct comedi_insn *, unsigned int *);
 114         int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
 115                           struct comedi_insn *, unsigned int *);
 116         int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
 117                             struct comedi_insn *, unsigned int *);
 118
 119         int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
 120         int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
 121                            struct comedi_cmd *);
 122         int (*poll) (struct comedi_device *, struct comedi_subdevice *);
 123         int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
 124         /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
 125         /* int (*do_unlock)(struct comedi_device *, \
 126                         struct comedi_subdevice *); */
 127
 128         /* called when the buffer changes */
 129         int (*buf_change) (struct comedi_device *dev,
 130                            struct comedi_subdevice *s, unsigned long new_size);
 131
 132         void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
 133                        void *data, unsigned int num_bytes,
 134                        unsigned int start_chan_index);
 135         enum dma_data_direction async_dma_dir;
 136
 137         unsigned int state;
 138
 139         struct device *class_dev;
 140         int minor;
 141 };
 142
 143 struct comedi_buf_page {
 144         void *virt_addr;
 145         dma_addr_t dma_addr;
 146 };
 147
 148 struct comedi_async {
 149         struct comedi_subdevice *subdevice;
 150
 151         void *prealloc_buf;     /* pre-allocated buffer */
 152         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 153         /* virtual and dma address of each page */
 154         struct comedi_buf_page *buf_page_list;
 155         unsigned n_buf_pages;   /* num elements in buf_page_list */
 156
 157         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 158         /* current number of mmaps of prealloc_buf */
 159         unsigned int mmap_count;
 160
 161         /* byte count for writer (write completed) */
 162         unsigned int buf_write_count;
 163         /* byte count for writer (allocated for writing) */
 164         unsigned int buf_write_alloc_count;
 165         /* byte count for reader (read completed) */
 166         unsigned int buf_read_count;
 167         /* byte count for reader (allocated for reading) */
 168         unsigned int buf_read_alloc_count;
 169
 170         unsigned int buf_write_ptr;     /* buffer marker for writer */
 171         unsigned int buf_read_ptr;      /* buffer marker for reader */
 172
 173         unsigned int cur_chan;  /* useless channel marker for interrupt */
 174         /* number of bytes that have been received for current scan */
 175         unsigned int scan_progress;
 176         /* keeps track of where we are in chanlist as for munging */
 177         unsigned int munge_chan;
 178         /* number of bytes that have been munged */
 179         unsigned int munge_count;
 180         /* buffer marker for munging */
 181         unsigned int munge_ptr;
 182
 183         unsigned int events;    /* events that have occurred */
 184
 185         struct comedi_cmd cmd;
 186
 187         wait_queue_head_t wait_head;
 188
 189         /* callback stuff */
 190         unsigned int cb_mask;
 191         int (*cb_func) (unsigned int flags, void *);
 192         void *cb_arg;
 193
 194         int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
 195                         unsigned int x);
 196 };
 197
 198 struct comedi_driver {
 199         struct comedi_driver *next;
 200
 201         const char *driver_name;
 202         struct module *module;
 203         int (*attach) (struct comedi_device *, struct comedi_devconfig *);
 204         void (*detach) (struct comedi_device *);
 205         int (*auto_attach) (struct comedi_device *, unsigned long);
 206
 207         /* number of elements in board_name and board_id arrays */
 208         unsigned int num_names;
 209         const char *const *board_name;
 210         /* offset in bytes from one board name pointer to the next */
 211         int offset;
 212 };
 213
 214 struct comedi_device {
 215         int use_count;
 216         struct comedi_driver *driver;
 217         void *private;
 218
 219         struct device *class_dev;
 220         int minor;
 221         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 222          * for subdevices that have async_dma_dir set to something other than
 223          * DMA_NONE */
 224         struct device *hw_dev;
 225
 226         const char *board_name;
 227         const void *board_ptr;
 228         int attached;
 229         spinlock_t spinlock;
 230         struct mutex mutex;
 231         int in_request_module;
 232
 233         int n_subdevices;
 234         struct comedi_subdevice *subdevices;
 235
 236         /* dumb */
 237         unsigned long iobase;
 238         unsigned int irq;
 239
 240         struct comedi_subdevice *read_subdev;
 241         struct comedi_subdevice *write_subdev;
 242
 243         struct fasync_struct *async_queue;
 244
 245         int (*open) (struct comedi_device *dev);
 246         void (*close) (struct comedi_device *dev);
 247 };
 248
 249 static inline const void *comedi_board(const struct comedi_device *dev)
 250 {
 251         return dev->board_ptr;
 252 }
 253
 254 #ifdef CONFIG_COMEDI_DEBUG
 255 extern int comedi_debug;
 256 #else
 257 static const int comedi_debug;
 258 #endif
 259
 260 /*
 261  * function prototypes
 262  */
 263
 264 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
 265 void comedi_error(const struct comedi_device *dev, const char *s);
 266
 267 /* we can expand the number of bits used to encode devices/subdevices into
 268  the minor number soon, after more distros support > 8 bit minor numbers
 269  (like after Debian Etch gets released) */
 270 enum comedi_minor_bits {
 271         COMEDI_DEVICE_MINOR_MASK = 0xf,
 272         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 273 };
 274 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 275 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 276
 277 struct comedi_device *comedi_dev_from_minor(unsigned minor);
 278
 279 int comedi_alloc_subdevices(struct comedi_device *, int);
 280
 281 void comedi_device_detach(struct comedi_device *dev);
 282 int comedi_device_attach(struct comedi_device *dev,
 283                          struct comedi_devconfig *it);
 284 int comedi_driver_register(struct comedi_driver *);
 285 int comedi_driver_unregister(struct comedi_driver *);
 286
 287 /**
 288  * module_comedi_driver() - Helper macro for registering a comedi driver
 289  * @__comedi_driver: comedi_driver struct
 290  *
 291  * Helper macro for comedi drivers which do not do anything special in module
 292  * init/exit. This eliminates a lot of boilerplate. Each module may only use
 293  * this macro once, and calling it replaces module_init() and module_exit().
 294  */
 295 #define module_comedi_driver(__comedi_driver) \
 296         module_driver(__comedi_driver, comedi_driver_register, \
 297                         comedi_driver_unregister)
 298
 299 int comedi_pci_enable(struct pci_dev *, const char *);
 300 void comedi_pci_disable(struct pci_dev *);
 301
 302 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
 303 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
 304
 305 /**
 306  * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
 307  * @__comedi_driver: comedi_driver struct
 308  * @__pci_driver: pci_driver struct
 309  *
 310  * Helper macro for comedi PCI drivers which do not do anything special
 311  * in module init/exit. This eliminates a lot of boilerplate. Each
 312  * module may only use this macro once, and calling it replaces
 313  * module_init() and module_exit()
 314  */
 315 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
 316         module_driver(__comedi_driver, comedi_pci_driver_register, \
 317                         comedi_pci_driver_unregister, &(__pci_driver))
 318
 319 struct usb_driver;
 320
 321 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
 322 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
 323
 324 /**
 325  * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
 326  * @__comedi_driver: comedi_driver struct
 327  * @__usb_driver: usb_driver struct
 328  *
 329  * Helper macro for comedi USB drivers which do not do anything special
 330  * in module init/exit. This eliminates a lot of boilerplate. Each
 331  * module may only use this macro once, and calling it replaces
 332  * module_init() and module_exit()
 333  */
 334 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
 335         module_driver(__comedi_driver, comedi_usb_driver_register, \
 336                         comedi_usb_driver_unregister, &(__usb_driver))
 337
 338 void init_polling(void);
 339 void cleanup_polling(void);
 340 void start_polling(struct comedi_device *);
 341 void stop_polling(struct comedi_device *);
 342
 343 #ifdef CONFIG_PROC_FS
 344 void comedi_proc_init(void);
 345 void comedi_proc_cleanup(void);
 346 #else
 347 static inline void comedi_proc_init(void)
 348 {
 349 }
 350
 351 static inline void comedi_proc_cleanup(void)
 352 {
 353 }
 354 #endif
 355
 356 /* subdevice runflags */
 357 enum subdevice_runflags {
 358         SRF_USER = 0x00000001,
 359         SRF_RT = 0x00000002,
 360         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 361          * command was started */
 362         SRF_ERROR = 0x00000004,
 363         SRF_RUNNING = 0x08000000
 364 };
 365
 366 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
 367
 368 int comedi_check_chanlist(struct comedi_subdevice *s,
 369                           int n,
 370                           unsigned int *chanlist);
 371
 372 /* range stuff */
 373
 374 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 375 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 376 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 377 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}
 378 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 379 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 380
 381 extern const struct comedi_lrange range_bipolar10;
 382 extern const struct comedi_lrange range_bipolar5;
 383 extern const struct comedi_lrange range_bipolar2_5;
 384 extern const struct comedi_lrange range_unipolar10;
 385 extern const struct comedi_lrange range_unipolar5;
 386 extern const struct comedi_lrange range_unknown;
 387
 388 #define range_digital           range_unipolar5
 389
 390 #if __GNUC__ >= 3
 391 #define GCC_ZERO_LENGTH_ARRAY
 392 #else
 393 #define GCC_ZERO_LENGTH_ARRAY 0
 394 #endif
 395
 396 struct comedi_lrange {
 397         int length;
 398         struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 399 };
 400
 401 /* some silly little inline functions */
 402
 403 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
 404 {
 405         if (subd->subdev_flags & SDF_LSAMPL)
 406                 return sizeof(unsigned int);
 407         else
 408                 return sizeof(short);
 409 }
 410
 411 /* must be used in attach to set dev->hw_dev if you wish to dma directly
 412 into comedi's buffer */
 413 static inline void comedi_set_hw_dev(struct comedi_device *dev,
 414                                      struct device *hw_dev)
 415 {
 416         if (dev->hw_dev == hw_dev)
 417                 return;
 418         if (dev->hw_dev)
 419                 put_device(dev->hw_dev);
 420         dev->hw_dev = hw_dev;
 421         if (dev->hw_dev) {
 422                 dev->hw_dev = get_device(dev->hw_dev);
 423                 BUG_ON(dev->hw_dev == NULL);
 424         }
 425 }
 426
 427 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
 428 {
 429         return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
 430 }
 431
 432 static inline struct usb_interface *
 433 comedi_to_usb_interface(struct comedi_device *dev)
 434 {
 435         return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
 436 }
 437
 438 int comedi_buf_put(struct comedi_async *async, short x);
 439 int comedi_buf_get(struct comedi_async *async, short *x);
 440
 441 unsigned int comedi_buf_write_alloc(struct comedi_async *async,
 442                                     unsigned int nbytes);
 443 unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes);
 444 unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes);
 445 unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes);
 446 unsigned int comedi_buf_read_n_available(struct comedi_async *async);
 447 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
 448                           const void *source, unsigned int num_bytes);
 449 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 450                             void *destination, unsigned int num_bytes);
 451 static inline unsigned comedi_buf_write_n_allocated(struct comedi_async *async)
 452 {
 453         return async->buf_write_alloc_count - async->buf_write_count;
 454 }
 455
 456 static inline unsigned comedi_buf_read_n_allocated(struct comedi_async *async)
 457 {
 458         return async->buf_read_alloc_count - async->buf_read_count;
 459 }
 460
 461 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
 462                                  struct comedi_subdevice *s);
 463 void comedi_free_subdevice_minor(struct comedi_subdevice *s);
 464 int comedi_auto_config(struct device *hardware_device,
 465                        struct comedi_driver *driver, unsigned long context);
 466 void comedi_auto_unconfig(struct device *hardware_device);
 467
 468 static inline int comedi_pci_auto_config(struct pci_dev *pcidev,
 469                                          struct comedi_driver *driver)
 470 {
 471         return comedi_auto_config(&pcidev->dev, driver, 0);
 472 }
 473
 474 static inline void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 475 {
 476         comedi_auto_unconfig(&pcidev->dev);
 477 }
 478
 479 static inline int comedi_usb_auto_config(struct usb_interface *intf,
 480                                          struct comedi_driver *driver)
 481 {
 482         return comedi_auto_config(&intf->dev, driver, 0);
 483 }
 484
 485 static inline void comedi_usb_auto_unconfig(struct usb_interface *intf)
 486 {
 487         comedi_auto_unconfig(&intf->dev);
 488 }
 489
 490 #endif /* _COMEDIDEV_H */