2 include/linux/comedidev.h
3 header file for kernel-only structures, variables, and constants
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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.
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.
22 #include <linux/dma-mapping.h>
26 #define DPRINTK(format, args...) do { \
28 pr_debug("comedi: " format, ## args); \
31 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
32 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
33 COMEDI_MINORVERSION, COMEDI_MICROVERSION)
34 #define COMEDI_RELEASE VERSION
36 #define COMEDI_NUM_BOARD_MINORS 0x30
38 struct comedi_subdevice {
39 struct comedi_device *device;
44 int len_chanlist; /* maximum length of channel/gain list */
48 struct comedi_async *async;
57 unsigned int maxdata; /* if maxdata==0, use list */
58 const unsigned int *maxdata_list; /* list is channel specific */
60 const struct comedi_lrange *range_table;
61 const struct comedi_lrange *const *range_table_list;
63 unsigned int *chanlist; /* driver-owned chanlist (not used) */
65 int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
66 struct comedi_insn *, unsigned int *);
67 int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
68 struct comedi_insn *, unsigned int *);
69 int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
70 struct comedi_insn *, unsigned int *);
71 int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
72 struct comedi_insn *, unsigned int *);
74 int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
75 int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
77 int (*poll) (struct comedi_device *, struct comedi_subdevice *);
78 int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
79 /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
80 /* int (*do_unlock)(struct comedi_device *, \
81 struct comedi_subdevice *); */
83 /* called when the buffer changes */
84 int (*buf_change) (struct comedi_device *dev,
85 struct comedi_subdevice *s, unsigned long new_size);
87 void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
88 void *data, unsigned int num_bytes,
89 unsigned int start_chan_index);
90 enum dma_data_direction async_dma_dir;
94 struct device *class_dev;
98 struct comedi_buf_page {
103 struct comedi_async {
104 struct comedi_subdevice *subdevice;
106 void *prealloc_buf; /* pre-allocated buffer */
107 unsigned int prealloc_bufsz; /* buffer size, in bytes */
108 /* virtual and dma address of each page */
109 struct comedi_buf_page *buf_page_list;
110 unsigned n_buf_pages; /* num elements in buf_page_list */
112 unsigned int max_bufsize; /* maximum buffer size, bytes */
113 /* current number of mmaps of prealloc_buf */
114 unsigned int mmap_count;
116 /* byte count for writer (write completed) */
117 unsigned int buf_write_count;
118 /* byte count for writer (allocated for writing) */
119 unsigned int buf_write_alloc_count;
120 /* byte count for reader (read completed) */
121 unsigned int buf_read_count;
122 /* byte count for reader (allocated for reading) */
123 unsigned int buf_read_alloc_count;
125 unsigned int buf_write_ptr; /* buffer marker for writer */
126 unsigned int buf_read_ptr; /* buffer marker for reader */
128 unsigned int cur_chan; /* useless channel marker for interrupt */
129 /* number of bytes that have been received for current scan */
130 unsigned int scan_progress;
131 /* keeps track of where we are in chanlist as for munging */
132 unsigned int munge_chan;
133 /* number of bytes that have been munged */
134 unsigned int munge_count;
135 /* buffer marker for munging */
136 unsigned int munge_ptr;
138 unsigned int events; /* events that have occurred */
140 struct comedi_cmd cmd;
142 wait_queue_head_t wait_head;
144 unsigned int cb_mask;
146 int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
150 struct comedi_driver {
151 struct comedi_driver *next;
153 const char *driver_name;
154 struct module *module;
155 int (*attach) (struct comedi_device *, struct comedi_devconfig *);
156 void (*detach) (struct comedi_device *);
157 int (*auto_attach) (struct comedi_device *, unsigned long);
159 /* number of elements in board_name and board_id arrays */
160 unsigned int num_names;
161 const char *const *board_name;
162 /* offset in bytes from one board name pointer to the next */
166 struct comedi_device {
168 struct comedi_driver *driver;
171 struct device *class_dev;
173 /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
174 * for subdevices that have async_dma_dir set to something other than
176 struct device *hw_dev;
178 const char *board_name;
179 const void *board_ptr;
181 bool in_request_module:1;
187 struct comedi_subdevice *subdevices;
190 unsigned long iobase;
194 struct comedi_subdevice *read_subdev;
195 struct comedi_subdevice *write_subdev;
197 struct fasync_struct *async_queue;
199 int (*open) (struct comedi_device *dev);
200 void (*close) (struct comedi_device *dev);
203 static inline const void *comedi_board(const struct comedi_device *dev)
205 return dev->board_ptr;
208 #ifdef CONFIG_COMEDI_DEBUG
209 extern int comedi_debug;
211 static const int comedi_debug;
215 * function prototypes
218 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
219 void comedi_error(const struct comedi_device *dev, const char *s);
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
228 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
229 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
231 struct comedi_device *comedi_dev_from_minor(unsigned minor);
233 void init_polling(void);
234 void cleanup_polling(void);
235 void start_polling(struct comedi_device *);
236 void stop_polling(struct comedi_device *);
238 /* subdevice runflags */
239 enum subdevice_runflags {
241 /* indicates an COMEDI_CB_ERROR event has occurred since the last
242 * command was started */
243 SRF_ERROR = 0x00000004,
244 SRF_RUNNING = 0x08000000,
245 SRF_FREE_SPRIV = 0x80000000, /* free s->private on detach */
248 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
250 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
252 int comedi_check_chanlist(struct comedi_subdevice *s,
254 unsigned int *chanlist);
258 #define RANGE(a, b) {(a)*1e6, (b)*1e6, 0}
259 #define RANGE_ext(a, b) {(a)*1e6, (b)*1e6, RF_EXTERNAL}
260 #define RANGE_mA(a, b) {(a)*1e6, (b)*1e6, UNIT_mA}
261 #define RANGE_unitless(a, b) {(a)*1e6, (b)*1e6, 0}
262 #define BIP_RANGE(a) {-(a)*1e6, (a)*1e6, 0}
263 #define UNI_RANGE(a) {0, (a)*1e6, 0}
265 extern const struct comedi_lrange range_bipolar10;
266 extern const struct comedi_lrange range_bipolar5;
267 extern const struct comedi_lrange range_bipolar2_5;
268 extern const struct comedi_lrange range_unipolar10;
269 extern const struct comedi_lrange range_unipolar5;
270 extern const struct comedi_lrange range_unipolar2_5;
271 extern const struct comedi_lrange range_0_20mA;
272 extern const struct comedi_lrange range_4_20mA;
273 extern const struct comedi_lrange range_0_32mA;
274 extern const struct comedi_lrange range_unknown;
276 #define range_digital range_unipolar5
279 #define GCC_ZERO_LENGTH_ARRAY
281 #define GCC_ZERO_LENGTH_ARRAY 0
284 struct comedi_lrange {
286 struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
289 static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
292 return s->range_table->range[range].min < 0;
295 static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
298 return s->range_table->range[range].min >= 0;
301 static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
305 return s->range_table_list[chan]->range[range].min < 0;
308 static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
312 return s->range_table_list[chan]->range[range].min >= 0;
315 /* munge between offset binary and two's complement values */
316 static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
319 return val ^ s->maxdata ^ (s->maxdata >> 1);
322 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
324 if (subd->subdev_flags & SDF_LSAMPL)
325 return sizeof(unsigned int);
327 return sizeof(short);
331 * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
332 * Also useful for retrieving a previously configured hardware device of
333 * known bus type. Set automatically for auto-configured devices.
334 * Automatically set to NULL when detaching hardware device.
336 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
338 unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
339 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
341 unsigned int comedi_buf_read_n_available(struct comedi_async *);
342 unsigned int comedi_buf_read_alloc(struct comedi_async *, unsigned int);
343 unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
345 int comedi_buf_put(struct comedi_async *, unsigned short);
346 int comedi_buf_get(struct comedi_async *, unsigned short *);
348 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
349 const void *source, unsigned int num_bytes);
350 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
351 void *destination, unsigned int num_bytes);
353 /* drivers.c - general comedi driver functions */
355 int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
356 struct comedi_insn *, unsigned int *data,
358 unsigned int comedi_dio_update_state(struct comedi_subdevice *,
361 void *comedi_alloc_devpriv(struct comedi_device *, size_t);
362 int comedi_alloc_subdevices(struct comedi_device *, int);
364 int comedi_load_firmware(struct comedi_device *, struct device *,
366 int (*cb)(struct comedi_device *,
367 const u8 *data, size_t size,
368 unsigned long context),
369 unsigned long context);
371 int __comedi_request_region(struct comedi_device *,
372 unsigned long start, unsigned long len);
373 int comedi_request_region(struct comedi_device *,
374 unsigned long start, unsigned long len);
375 void comedi_legacy_detach(struct comedi_device *);
377 int comedi_auto_config(struct device *, struct comedi_driver *,
378 unsigned long context);
379 void comedi_auto_unconfig(struct device *);
381 int comedi_driver_register(struct comedi_driver *);
382 void comedi_driver_unregister(struct comedi_driver *);
385 * module_comedi_driver() - Helper macro for registering a comedi driver
386 * @__comedi_driver: comedi_driver struct
388 * Helper macro for comedi drivers which do not do anything special in module
389 * init/exit. This eliminates a lot of boilerplate. Each module may only use
390 * this macro once, and calling it replaces module_init() and module_exit().
392 #define module_comedi_driver(__comedi_driver) \
393 module_driver(__comedi_driver, comedi_driver_register, \
394 comedi_driver_unregister)
396 #ifdef CONFIG_COMEDI_PCI_DRIVERS
398 /* comedi_pci.c - comedi PCI driver specific functions */
401 * PCI Vendor IDs not in <linux/pci_ids.h>
403 #define PCI_VENDOR_ID_KOLTER 0x1001
404 #define PCI_VENDOR_ID_ICP 0x104c
405 #define PCI_VENDOR_ID_DT 0x1116
406 #define PCI_VENDOR_ID_IOTECH 0x1616
407 #define PCI_VENDOR_ID_CONTEC 0x1221
408 #define PCI_VENDOR_ID_RTD 0x1435
413 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
415 int comedi_pci_enable(struct comedi_device *);
416 void comedi_pci_disable(struct comedi_device *);
418 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
419 unsigned long context);
420 void comedi_pci_auto_unconfig(struct pci_dev *);
422 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
423 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
426 * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
427 * @__comedi_driver: comedi_driver struct
428 * @__pci_driver: pci_driver struct
430 * Helper macro for comedi PCI drivers which do not do anything special
431 * in module init/exit. This eliminates a lot of boilerplate. Each
432 * module may only use this macro once, and calling it replaces
433 * module_init() and module_exit()
435 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
436 module_driver(__comedi_driver, comedi_pci_driver_register, \
437 comedi_pci_driver_unregister, &(__pci_driver))
442 * Some of the comedi mixed ISA/PCI drivers call the PCI specific
443 * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
447 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
452 static inline int comedi_pci_enable(struct comedi_device *dev)
457 static inline void comedi_pci_disable(struct comedi_device *dev)
461 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
463 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
465 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
467 struct pcmcia_driver;
468 struct pcmcia_device;
470 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
472 int comedi_pcmcia_enable(struct comedi_device *,
473 int (*conf_check)(struct pcmcia_device *, void *));
474 void comedi_pcmcia_disable(struct comedi_device *);
476 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
477 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
479 int comedi_pcmcia_driver_register(struct comedi_driver *,
480 struct pcmcia_driver *);
481 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
482 struct pcmcia_driver *);
485 * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
486 * @__comedi_driver: comedi_driver struct
487 * @__pcmcia_driver: pcmcia_driver struct
489 * Helper macro for comedi PCMCIA drivers which do not do anything special
490 * in module init/exit. This eliminates a lot of boilerplate. Each
491 * module may only use this macro once, and calling it replaces
492 * module_init() and module_exit()
494 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
495 module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
496 comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
498 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
500 #ifdef CONFIG_COMEDI_USB_DRIVERS
502 /* comedi_usb.c - comedi USB driver specific functions */
505 struct usb_interface;
507 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
508 struct usb_device *comedi_to_usb_dev(struct comedi_device *);
510 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
511 unsigned long context);
512 void comedi_usb_auto_unconfig(struct usb_interface *);
514 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
515 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
518 * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
519 * @__comedi_driver: comedi_driver struct
520 * @__usb_driver: usb_driver struct
522 * Helper macro for comedi USB drivers which do not do anything special
523 * in module init/exit. This eliminates a lot of boilerplate. Each
524 * module may only use this macro once, and calling it replaces
525 * module_init() and module_exit()
527 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
528 module_driver(__comedi_driver, comedi_usb_driver_register, \
529 comedi_usb_driver_unregister, &(__usb_driver))
531 #endif /* CONFIG_COMEDI_USB_DRIVERS */
533 #endif /* _COMEDIDEV_H */