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
  19 #ifndef _COMEDIDEV_H
  20 #define _COMEDIDEV_H
  21
  22 #include <linux/dma-mapping.h>
  23 #include <linux/mutex.h>
  24 #include <linux/spinlock_types.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/kref.h>
  27
  28 #include "comedi.h"
  29
  30 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
  31 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
  32         COMEDI_MINORVERSION, COMEDI_MICROVERSION)
  33 #define COMEDI_RELEASE VERSION
  34
  35 #define COMEDI_NUM_BOARD_MINORS 0x30
  36
  37 struct comedi_subdevice {
  38         struct comedi_device *device;
  39         int index;
  40         int type;
  41         int n_chan;
  42         int subdev_flags;
  43         int len_chanlist;       /* maximum length of channel/gain list */
  44
  45         void *private;
  46
  47         struct comedi_async *async;
  48
  49         void *lock;
  50         void *busy;
  51         unsigned runflags;
  52         spinlock_t spin_lock;
  53
  54         unsigned int io_bits;
  55
  56         unsigned int maxdata;   /* if maxdata==0, use list */
  57         const unsigned int *maxdata_list;       /* list is channel specific */
  58
  59         const struct comedi_lrange *range_table;
  60         const struct comedi_lrange *const *range_table_list;
  61
  62         unsigned int *chanlist; /* driver-owned chanlist (not used) */
  63
  64         int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
  65                           struct comedi_insn *, unsigned int *);
  66         int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
  67                            struct comedi_insn *, unsigned int *);
  68         int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
  69                           struct comedi_insn *, unsigned int *);
  70         int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
  71                             struct comedi_insn *, unsigned int *);
  72
  73         int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
  74         int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
  75                            struct comedi_cmd *);
  76         int (*poll) (struct comedi_device *, struct comedi_subdevice *);
  77         int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
  78         /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
  79         /* int (*do_unlock)(struct comedi_device *, \
  80                         struct comedi_subdevice *); */
  81
  82         /* called when the buffer changes */
  83         int (*buf_change) (struct comedi_device *dev,
  84                            struct comedi_subdevice *s, unsigned long new_size);
  85
  86         void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
  87                        void *data, unsigned int num_bytes,
  88                        unsigned int start_chan_index);
  89         enum dma_data_direction async_dma_dir;
  90
  91         unsigned int state;
  92
  93         struct device *class_dev;
  94         int minor;
  95 };
  96
  97 struct comedi_buf_page {
  98         void *virt_addr;
  99         dma_addr_t dma_addr;
 100 };
 101
 102 struct comedi_buf_map {
 103         struct device *dma_hw_dev;
 104         struct comedi_buf_page *page_list;
 105         unsigned int n_pages;
 106         enum dma_data_direction dma_dir;
 107         struct kref refcount;
 108 };
 109
 110 struct comedi_async {
 111         struct comedi_subdevice *subdevice;
 112
 113         void *prealloc_buf;     /* pre-allocated buffer */
 114         unsigned int prealloc_bufsz;    /* buffer size, in bytes */
 115         struct comedi_buf_map *buf_map; /* map of buffer pages */
 116
 117         unsigned int max_bufsize;       /* maximum buffer size, bytes */
 118
 119         /* byte count for writer (write completed) */
 120         unsigned int buf_write_count;
 121         /* byte count for writer (allocated for writing) */
 122         unsigned int buf_write_alloc_count;
 123         /* byte count for reader (read completed) */
 124         unsigned int buf_read_count;
 125         /* byte count for reader (allocated for reading) */
 126         unsigned int buf_read_alloc_count;
 127
 128         unsigned int buf_write_ptr;     /* buffer marker for writer */
 129         unsigned int buf_read_ptr;      /* buffer marker for reader */
 130
 131         unsigned int cur_chan;  /* useless channel marker for interrupt */
 132         /* number of bytes that have been received for current scan */
 133         unsigned int scan_progress;
 134         /* keeps track of where we are in chanlist as for munging */
 135         unsigned int munge_chan;
 136         /* number of bytes that have been munged */
 137         unsigned int munge_count;
 138         /* buffer marker for munging */
 139         unsigned int munge_ptr;
 140
 141         unsigned int events;    /* events that have occurred */
 142
 143         struct comedi_cmd cmd;
 144
 145         wait_queue_head_t wait_head;
 146
 147         unsigned int cb_mask;
 148
 149         int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
 150                         unsigned int x);
 151 };
 152
 153 struct comedi_driver {
 154         struct comedi_driver *next;
 155
 156         const char *driver_name;
 157         struct module *module;
 158         int (*attach) (struct comedi_device *, struct comedi_devconfig *);
 159         void (*detach) (struct comedi_device *);
 160         int (*auto_attach) (struct comedi_device *, unsigned long);
 161
 162         /* number of elements in board_name and board_id arrays */
 163         unsigned int num_names;
 164         const char *const *board_name;
 165         /* offset in bytes from one board name pointer to the next */
 166         int offset;
 167 };
 168
 169 struct comedi_device {
 170         int use_count;
 171         struct comedi_driver *driver;
 172         void *private;
 173
 174         struct device *class_dev;
 175         int minor;
 176         unsigned int detach_count;
 177         /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
 178          * for subdevices that have async_dma_dir set to something other than
 179          * DMA_NONE */
 180         struct device *hw_dev;
 181
 182         const char *board_name;
 183         const void *board_ptr;
 184         bool attached:1;
 185         bool in_request_module:1;
 186         bool ioenabled:1;
 187         spinlock_t spinlock;
 188         struct mutex mutex;
 189         struct rw_semaphore attach_lock;
 190         struct kref refcount;
 191
 192         int n_subdevices;
 193         struct comedi_subdevice *subdevices;
 194
 195         /* dumb */
 196         unsigned long iobase;
 197         unsigned long iolen;
 198         unsigned int irq;
 199
 200         struct comedi_subdevice *read_subdev;
 201         struct comedi_subdevice *write_subdev;
 202
 203         struct fasync_struct *async_queue;
 204
 205         int (*open) (struct comedi_device *dev);
 206         void (*close) (struct comedi_device *dev);
 207 };
 208
 209 static inline const void *comedi_board(const struct comedi_device *dev)
 210 {
 211         return dev->board_ptr;
 212 }
 213
 214 /*
 215  * function prototypes
 216  */
 217
 218 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
 219 void comedi_error(const struct comedi_device *dev, const char *s);
 220
 221 /* we can expand the number of bits used to encode devices/subdevices into
 222  the minor number soon, after more distros support > 8 bit minor numbers
 223  (like after Debian Etch gets released) */
 224 enum comedi_minor_bits {
 225         COMEDI_DEVICE_MINOR_MASK = 0xf,
 226         COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
 227 };
 228 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
 229 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
 230
 231 struct comedi_device *comedi_dev_get_from_minor(unsigned minor);
 232 int comedi_dev_put(struct comedi_device *dev);
 233
 234 void init_polling(void);
 235 void cleanup_polling(void);
 236 void start_polling(struct comedi_device *);
 237 void stop_polling(struct comedi_device *);
 238
 239 /* subdevice runflags */
 240 enum subdevice_runflags {
 241         SRF_RT = 0x00000002,
 242         /* indicates an COMEDI_CB_ERROR event has occurred since the last
 243          * command was started */
 244         SRF_ERROR = 0x00000004,
 245         SRF_RUNNING = 0x08000000,
 246         SRF_FREE_SPRIV = 0x80000000,    /* free s->private on detach */
 247 };
 248
 249 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
 250
 251 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
 252
 253 int comedi_check_chanlist(struct comedi_subdevice *s,
 254                           int n,
 255                           unsigned int *chanlist);
 256
 257 /* range stuff */
 258
 259 #define RANGE(a, b)             {(a)*1e6, (b)*1e6, 0}
 260 #define RANGE_ext(a, b)         {(a)*1e6, (b)*1e6, RF_EXTERNAL}
 261 #define RANGE_mA(a, b)          {(a)*1e6, (b)*1e6, UNIT_mA}
 262 #define RANGE_unitless(a, b)    {(a)*1e6, (b)*1e6, 0}
 263 #define BIP_RANGE(a)            {-(a)*1e6, (a)*1e6, 0}
 264 #define UNI_RANGE(a)            {0, (a)*1e6, 0}
 265
 266 extern const struct comedi_lrange range_bipolar10;
 267 extern const struct comedi_lrange range_bipolar5;
 268 extern const struct comedi_lrange range_bipolar2_5;
 269 extern const struct comedi_lrange range_unipolar10;
 270 extern const struct comedi_lrange range_unipolar5;
 271 extern const struct comedi_lrange range_unipolar2_5;
 272 extern const struct comedi_lrange range_0_20mA;
 273 extern const struct comedi_lrange range_4_20mA;
 274 extern const struct comedi_lrange range_0_32mA;
 275 extern const struct comedi_lrange range_unknown;
 276
 277 #define range_digital           range_unipolar5
 278
 279 #if __GNUC__ >= 3
 280 #define GCC_ZERO_LENGTH_ARRAY
 281 #else
 282 #define GCC_ZERO_LENGTH_ARRAY 0
 283 #endif
 284
 285 struct comedi_lrange {
 286         int length;
 287         struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
 288 };
 289
 290 static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
 291                                            unsigned int range)
 292 {
 293         return s->range_table->range[range].min < 0;
 294 }
 295
 296 static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
 297                                             unsigned int range)
 298 {
 299         return s->range_table->range[range].min >= 0;
 300 }
 301
 302 static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
 303                                                 unsigned int chan,
 304                                                 unsigned int range)
 305 {
 306         return s->range_table_list[chan]->range[range].min < 0;
 307 }
 308
 309 static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
 310                                                  unsigned int chan,
 311                                                  unsigned int range)
 312 {
 313         return s->range_table_list[chan]->range[range].min >= 0;
 314 }
 315
 316 /* munge between offset binary and two's complement values */
 317 static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
 318                                                unsigned int val)
 319 {
 320         return val ^ s->maxdata ^ (s->maxdata >> 1);
 321 }
 322
 323 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
 324 {
 325         if (subd->subdev_flags & SDF_LSAMPL)
 326                 return sizeof(unsigned int);
 327         else
 328                 return sizeof(short);
 329 }
 330
 331 /*
 332  * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
 333  * Also useful for retrieving a previously configured hardware device of
 334  * known bus type.  Set automatically for auto-configured devices.
 335  * Automatically set to NULL when detaching hardware device.
 336  */
 337 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
 338
 339 unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
 340 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
 341
 342 unsigned int comedi_buf_read_n_available(struct comedi_async *);
 343 unsigned int comedi_buf_read_alloc(struct comedi_async *, unsigned int);
 344 unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
 345
 346 int comedi_buf_put(struct comedi_async *, unsigned short);
 347 int comedi_buf_get(struct comedi_async *, unsigned short *);
 348
 349 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
 350                           const void *source, unsigned int num_bytes);
 351 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 352                             void *destination, unsigned int num_bytes);
 353
 354 /* drivers.c - general comedi driver functions */
 355
 356 int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
 357                            struct comedi_insn *, unsigned int *data,
 358                            unsigned int mask);
 359 unsigned int comedi_dio_update_state(struct comedi_subdevice *,
 360                                      unsigned int *data);
 361
 362 void *comedi_alloc_devpriv(struct comedi_device *, size_t);
 363 int comedi_alloc_subdevices(struct comedi_device *, int);
 364
 365 int comedi_load_firmware(struct comedi_device *, struct device *,
 366                          const char *name,
 367                          int (*cb)(struct comedi_device *,
 368                                    const u8 *data, size_t size,
 369                                    unsigned long context),
 370                          unsigned long context);
 371
 372 int __comedi_request_region(struct comedi_device *,
 373                             unsigned long start, unsigned long len);
 374 int comedi_request_region(struct comedi_device *,
 375                           unsigned long start, unsigned long len);
 376 void comedi_legacy_detach(struct comedi_device *);
 377
 378 int comedi_auto_config(struct device *, struct comedi_driver *,
 379                        unsigned long context);
 380 void comedi_auto_unconfig(struct device *);
 381
 382 int comedi_driver_register(struct comedi_driver *);
 383 void comedi_driver_unregister(struct comedi_driver *);
 384
 385 /**
 386  * module_comedi_driver() - Helper macro for registering a comedi driver
 387  * @__comedi_driver: comedi_driver struct
 388  *
 389  * Helper macro for comedi drivers which do not do anything special in module
 390  * init/exit. This eliminates a lot of boilerplate. Each module may only use
 391  * this macro once, and calling it replaces module_init() and module_exit().
 392  */
 393 #define module_comedi_driver(__comedi_driver) \
 394         module_driver(__comedi_driver, comedi_driver_register, \
 395                         comedi_driver_unregister)
 396
 397 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 398
 399 /* comedi_pci.c - comedi PCI driver specific functions */
 400
 401 /*
 402  * PCI Vendor IDs not in <linux/pci_ids.h>
 403  */
 404 #define PCI_VENDOR_ID_KOLTER            0x1001
 405 #define PCI_VENDOR_ID_ICP               0x104c
 406 #define PCI_VENDOR_ID_DT                0x1116
 407 #define PCI_VENDOR_ID_IOTECH            0x1616
 408 #define PCI_VENDOR_ID_CONTEC            0x1221
 409 #define PCI_VENDOR_ID_RTD               0x1435
 410 #define PCI_VENDOR_ID_HUMUSOFT          0x186c
 411
 412 struct pci_dev;
 413 struct pci_driver;
 414
 415 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
 416
 417 int comedi_pci_enable(struct comedi_device *);
 418 void comedi_pci_disable(struct comedi_device *);
 419
 420 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
 421                            unsigned long context);
 422 void comedi_pci_auto_unconfig(struct pci_dev *);
 423
 424 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
 425 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
 426
 427 /**
 428  * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
 429  * @__comedi_driver: comedi_driver struct
 430  * @__pci_driver: pci_driver struct
 431  *
 432  * Helper macro for comedi PCI drivers which do not do anything special
 433  * in module init/exit. This eliminates a lot of boilerplate. Each
 434  * module may only use this macro once, and calling it replaces
 435  * module_init() and module_exit()
 436  */
 437 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
 438         module_driver(__comedi_driver, comedi_pci_driver_register, \
 439                         comedi_pci_driver_unregister, &(__pci_driver))
 440
 441 #else
 442
 443 /*
 444  * Some of the comedi mixed ISA/PCI drivers call the PCI specific
 445  * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
 446  * is not enabled.
 447  */
 448
 449 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
 450 {
 451         return NULL;
 452 }
 453
 454 static inline int comedi_pci_enable(struct comedi_device *dev)
 455 {
 456         return -ENOSYS;
 457 }
 458
 459 static inline void comedi_pci_disable(struct comedi_device *dev)
 460 {
 461 }
 462
 463 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
 464
 465 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
 466
 467 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
 468
 469 struct pcmcia_driver;
 470 struct pcmcia_device;
 471
 472 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
 473
 474 int comedi_pcmcia_enable(struct comedi_device *,
 475                          int (*conf_check)(struct pcmcia_device *, void *));
 476 void comedi_pcmcia_disable(struct comedi_device *);
 477
 478 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
 479 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
 480
 481 int comedi_pcmcia_driver_register(struct comedi_driver *,
 482                                         struct pcmcia_driver *);
 483 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
 484                                         struct pcmcia_driver *);
 485
 486 /**
 487  * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
 488  * @__comedi_driver: comedi_driver struct
 489  * @__pcmcia_driver: pcmcia_driver struct
 490  *
 491  * Helper macro for comedi PCMCIA drivers which do not do anything special
 492  * in module init/exit. This eliminates a lot of boilerplate. Each
 493  * module may only use this macro once, and calling it replaces
 494  * module_init() and module_exit()
 495  */
 496 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
 497         module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
 498                         comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
 499
 500 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
 501
 502 #ifdef CONFIG_COMEDI_USB_DRIVERS
 503
 504 /* comedi_usb.c - comedi USB driver specific functions */
 505
 506 struct usb_driver;
 507 struct usb_interface;
 508
 509 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
 510 struct usb_device *comedi_to_usb_dev(struct comedi_device *);
 511
 512 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
 513                            unsigned long context);
 514 void comedi_usb_auto_unconfig(struct usb_interface *);
 515
 516 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
 517 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
 518
 519 /**
 520  * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
 521  * @__comedi_driver: comedi_driver struct
 522  * @__usb_driver: usb_driver struct
 523  *
 524  * Helper macro for comedi USB drivers which do not do anything special
 525  * in module init/exit. This eliminates a lot of boilerplate. Each
 526  * module may only use this macro once, and calling it replaces
 527  * module_init() and module_exit()
 528  */
 529 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
 530         module_driver(__comedi_driver, comedi_usb_driver_register, \
 531                         comedi_usb_driver_unregister, &(__usb_driver))
 532
 533 #endif /* CONFIG_COMEDI_USB_DRIVERS */
 534
 535 #endif /* _COMEDIDEV_H */