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>
23 #include <linux/mutex.h>
24 #include <linux/spinlock_types.h>
25 #include <linux/rwsem.h>
29 #define DPRINTK(format, args...) do { \
31 pr_debug("comedi: " format, ## args); \
34 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
35 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
36 COMEDI_MINORVERSION, COMEDI_MICROVERSION)
37 #define COMEDI_RELEASE VERSION
39 #define COMEDI_NUM_BOARD_MINORS 0x30
41 struct comedi_subdevice {
42 struct comedi_device *device;
47 int len_chanlist; /* maximum length of channel/gain list */
51 struct comedi_async *async;
60 unsigned int maxdata; /* if maxdata==0, use list */
61 const unsigned int *maxdata_list; /* list is channel specific */
63 const struct comedi_lrange *range_table;
64 const struct comedi_lrange *const *range_table_list;
66 unsigned int *chanlist; /* driver-owned chanlist (not used) */
68 int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
69 struct comedi_insn *, unsigned int *);
70 int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
71 struct comedi_insn *, unsigned int *);
72 int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
73 struct comedi_insn *, unsigned int *);
74 int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
75 struct comedi_insn *, unsigned int *);
77 int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
78 int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
80 int (*poll) (struct comedi_device *, struct comedi_subdevice *);
81 int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
82 /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
83 /* int (*do_unlock)(struct comedi_device *, \
84 struct comedi_subdevice *); */
86 /* called when the buffer changes */
87 int (*buf_change) (struct comedi_device *dev,
88 struct comedi_subdevice *s, unsigned long new_size);
90 void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
91 void *data, unsigned int num_bytes,
92 unsigned int start_chan_index);
93 enum dma_data_direction async_dma_dir;
97 struct device *class_dev;
101 struct comedi_buf_page {
106 struct comedi_async {
107 struct comedi_subdevice *subdevice;
109 void *prealloc_buf; /* pre-allocated buffer */
110 unsigned int prealloc_bufsz; /* buffer size, in bytes */
111 /* virtual and dma address of each page */
112 struct comedi_buf_page *buf_page_list;
113 unsigned n_buf_pages; /* num elements in buf_page_list */
115 unsigned int max_bufsize; /* maximum buffer size, bytes */
116 /* current number of mmaps of prealloc_buf */
117 unsigned int mmap_count;
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;
128 unsigned int buf_write_ptr; /* buffer marker for writer */
129 unsigned int buf_read_ptr; /* buffer marker for reader */
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;
141 unsigned int events; /* events that have occurred */
143 struct comedi_cmd cmd;
145 wait_queue_head_t wait_head;
147 unsigned int cb_mask;
149 int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
153 struct comedi_driver {
154 struct comedi_driver *next;
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);
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 */
169 struct comedi_device {
171 struct comedi_driver *driver;
174 struct device *class_dev;
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
180 struct device *hw_dev;
182 const char *board_name;
183 const void *board_ptr;
185 bool in_request_module:1;
189 struct rw_semaphore attach_lock;
192 struct comedi_subdevice *subdevices;
195 unsigned long iobase;
199 struct comedi_subdevice *read_subdev;
200 struct comedi_subdevice *write_subdev;
202 struct fasync_struct *async_queue;
204 int (*open) (struct comedi_device *dev);
205 void (*close) (struct comedi_device *dev);
208 static inline const void *comedi_board(const struct comedi_device *dev)
210 return dev->board_ptr;
213 #ifdef CONFIG_COMEDI_DEBUG
214 extern int comedi_debug;
216 static const int comedi_debug;
220 * function prototypes
223 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
224 void comedi_error(const struct comedi_device *dev, const char *s);
226 /* we can expand the number of bits used to encode devices/subdevices into
227 the minor number soon, after more distros support > 8 bit minor numbers
228 (like after Debian Etch gets released) */
229 enum comedi_minor_bits {
230 COMEDI_DEVICE_MINOR_MASK = 0xf,
231 COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
233 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
234 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
236 struct comedi_device *comedi_dev_from_minor(unsigned minor);
238 void init_polling(void);
239 void cleanup_polling(void);
240 void start_polling(struct comedi_device *);
241 void stop_polling(struct comedi_device *);
243 /* subdevice runflags */
244 enum subdevice_runflags {
246 /* indicates an COMEDI_CB_ERROR event has occurred since the last
247 * command was started */
248 SRF_ERROR = 0x00000004,
249 SRF_RUNNING = 0x08000000,
250 SRF_FREE_SPRIV = 0x80000000, /* free s->private on detach */
253 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
255 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
257 int comedi_check_chanlist(struct comedi_subdevice *s,
259 unsigned int *chanlist);
263 #define RANGE(a, b) {(a)*1e6, (b)*1e6, 0}
264 #define RANGE_ext(a, b) {(a)*1e6, (b)*1e6, RF_EXTERNAL}
265 #define RANGE_mA(a, b) {(a)*1e6, (b)*1e6, UNIT_mA}
266 #define RANGE_unitless(a, b) {(a)*1e6, (b)*1e6, 0}
267 #define BIP_RANGE(a) {-(a)*1e6, (a)*1e6, 0}
268 #define UNI_RANGE(a) {0, (a)*1e6, 0}
270 extern const struct comedi_lrange range_bipolar10;
271 extern const struct comedi_lrange range_bipolar5;
272 extern const struct comedi_lrange range_bipolar2_5;
273 extern const struct comedi_lrange range_unipolar10;
274 extern const struct comedi_lrange range_unipolar5;
275 extern const struct comedi_lrange range_unipolar2_5;
276 extern const struct comedi_lrange range_0_20mA;
277 extern const struct comedi_lrange range_4_20mA;
278 extern const struct comedi_lrange range_0_32mA;
279 extern const struct comedi_lrange range_unknown;
281 #define range_digital range_unipolar5
284 #define GCC_ZERO_LENGTH_ARRAY
286 #define GCC_ZERO_LENGTH_ARRAY 0
289 struct comedi_lrange {
291 struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
294 static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
297 return s->range_table->range[range].min < 0;
300 static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
303 return s->range_table->range[range].min >= 0;
306 static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
310 return s->range_table_list[chan]->range[range].min < 0;
313 static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
317 return s->range_table_list[chan]->range[range].min >= 0;
320 /* munge between offset binary and two's complement values */
321 static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
324 return val ^ s->maxdata ^ (s->maxdata >> 1);
327 static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
329 if (subd->subdev_flags & SDF_LSAMPL)
330 return sizeof(unsigned int);
332 return sizeof(short);
336 * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
337 * Also useful for retrieving a previously configured hardware device of
338 * known bus type. Set automatically for auto-configured devices.
339 * Automatically set to NULL when detaching hardware device.
341 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
343 unsigned int comedi_buf_write_alloc(struct comedi_async *, unsigned int);
344 unsigned int comedi_buf_write_free(struct comedi_async *, unsigned int);
346 unsigned int comedi_buf_read_n_available(struct comedi_async *);
347 unsigned int comedi_buf_read_alloc(struct comedi_async *, unsigned int);
348 unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
350 int comedi_buf_put(struct comedi_async *, unsigned short);
351 int comedi_buf_get(struct comedi_async *, unsigned short *);
353 void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
354 const void *source, unsigned int num_bytes);
355 void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
356 void *destination, unsigned int num_bytes);
358 /* drivers.c - general comedi driver functions */
360 int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
361 struct comedi_insn *, unsigned int *data,
363 unsigned int comedi_dio_update_state(struct comedi_subdevice *,
366 void *comedi_alloc_devpriv(struct comedi_device *, size_t);
367 int comedi_alloc_subdevices(struct comedi_device *, int);
369 int comedi_load_firmware(struct comedi_device *, struct device *,
371 int (*cb)(struct comedi_device *,
372 const u8 *data, size_t size,
373 unsigned long context),
374 unsigned long context);
376 int __comedi_request_region(struct comedi_device *,
377 unsigned long start, unsigned long len);
378 int comedi_request_region(struct comedi_device *,
379 unsigned long start, unsigned long len);
380 void comedi_legacy_detach(struct comedi_device *);
382 int comedi_auto_config(struct device *, struct comedi_driver *,
383 unsigned long context);
384 void comedi_auto_unconfig(struct device *);
386 int comedi_driver_register(struct comedi_driver *);
387 void comedi_driver_unregister(struct comedi_driver *);
390 * module_comedi_driver() - Helper macro for registering a comedi driver
391 * @__comedi_driver: comedi_driver struct
393 * Helper macro for comedi drivers which do not do anything special in module
394 * init/exit. This eliminates a lot of boilerplate. Each module may only use
395 * this macro once, and calling it replaces module_init() and module_exit().
397 #define module_comedi_driver(__comedi_driver) \
398 module_driver(__comedi_driver, comedi_driver_register, \
399 comedi_driver_unregister)
401 #ifdef CONFIG_COMEDI_PCI_DRIVERS
403 /* comedi_pci.c - comedi PCI driver specific functions */
406 * PCI Vendor IDs not in <linux/pci_ids.h>
408 #define PCI_VENDOR_ID_KOLTER 0x1001
409 #define PCI_VENDOR_ID_ICP 0x104c
410 #define PCI_VENDOR_ID_DT 0x1116
411 #define PCI_VENDOR_ID_IOTECH 0x1616
412 #define PCI_VENDOR_ID_CONTEC 0x1221
413 #define PCI_VENDOR_ID_RTD 0x1435
418 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
420 int comedi_pci_enable(struct comedi_device *);
421 void comedi_pci_disable(struct comedi_device *);
423 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
424 unsigned long context);
425 void comedi_pci_auto_unconfig(struct pci_dev *);
427 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
428 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
431 * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
432 * @__comedi_driver: comedi_driver struct
433 * @__pci_driver: pci_driver struct
435 * Helper macro for comedi PCI drivers which do not do anything special
436 * in module init/exit. This eliminates a lot of boilerplate. Each
437 * module may only use this macro once, and calling it replaces
438 * module_init() and module_exit()
440 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
441 module_driver(__comedi_driver, comedi_pci_driver_register, \
442 comedi_pci_driver_unregister, &(__pci_driver))
447 * Some of the comedi mixed ISA/PCI drivers call the PCI specific
448 * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
452 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
457 static inline int comedi_pci_enable(struct comedi_device *dev)
462 static inline void comedi_pci_disable(struct comedi_device *dev)
466 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
468 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
470 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
472 struct pcmcia_driver;
473 struct pcmcia_device;
475 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
477 int comedi_pcmcia_enable(struct comedi_device *,
478 int (*conf_check)(struct pcmcia_device *, void *));
479 void comedi_pcmcia_disable(struct comedi_device *);
481 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
482 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
484 int comedi_pcmcia_driver_register(struct comedi_driver *,
485 struct pcmcia_driver *);
486 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
487 struct pcmcia_driver *);
490 * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
491 * @__comedi_driver: comedi_driver struct
492 * @__pcmcia_driver: pcmcia_driver struct
494 * Helper macro for comedi PCMCIA drivers which do not do anything special
495 * in module init/exit. This eliminates a lot of boilerplate. Each
496 * module may only use this macro once, and calling it replaces
497 * module_init() and module_exit()
499 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
500 module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
501 comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
503 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
505 #ifdef CONFIG_COMEDI_USB_DRIVERS
507 /* comedi_usb.c - comedi USB driver specific functions */
510 struct usb_interface;
512 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
513 struct usb_device *comedi_to_usb_dev(struct comedi_device *);
515 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
516 unsigned long context);
517 void comedi_usb_auto_unconfig(struct usb_interface *);
519 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
520 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
523 * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
524 * @__comedi_driver: comedi_driver struct
525 * @__usb_driver: usb_driver struct
527 * Helper macro for comedi USB drivers which do not do anything special
528 * in module init/exit. This eliminates a lot of boilerplate. Each
529 * module may only use this macro once, and calling it replaces
530 * module_init() and module_exit()
532 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
533 module_driver(__comedi_driver, comedi_usb_driver_register, \
534 comedi_usb_driver_unregister, &(__usb_driver))
536 #endif /* CONFIG_COMEDI_USB_DRIVERS */
538 #endif /* _COMEDIDEV_H */