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/kernel.h>
23 #include <linux/module.h>
24 #include <linux/kdev_t.h>
25 #include <linux/slab.h>
26 #include <linux/delay.h>
27 #include <linux/errno.h>
28 #include <linux/spinlock.h>
29 #include <linux/mutex.h>
30 #include <linux/wait.h>
32 #include <linux/init.h>
33 #include <linux/vmalloc.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/uaccess.h>
37 #include <linux/timer.h>
41 #define DPRINTK(format, args...) do { \
43 pr_debug("comedi: " format, ## args); \
46 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
47 #define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
48 COMEDI_MINORVERSION, COMEDI_MICROVERSION)
49 #define COMEDI_RELEASE VERSION
51 #define COMEDI_NUM_BOARD_MINORS 0x30
53 struct comedi_subdevice {
54 struct comedi_device *device;
59 int len_chanlist; /* maximum length of channel/gain list */
63 struct comedi_async *async;
72 unsigned int maxdata; /* if maxdata==0, use list */
73 const unsigned int *maxdata_list; /* list is channel specific */
76 const unsigned int *flaglist;
78 unsigned int settling_time_0;
80 const struct comedi_lrange *range_table;
81 const struct comedi_lrange *const *range_table_list;
83 unsigned int *chanlist; /* driver-owned chanlist (not used) */
85 int (*insn_read) (struct comedi_device *, struct comedi_subdevice *,
86 struct comedi_insn *, unsigned int *);
87 int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
88 struct comedi_insn *, unsigned int *);
89 int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
90 struct comedi_insn *, unsigned int *);
91 int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
92 struct comedi_insn *, unsigned int *);
94 int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
95 int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
97 int (*poll) (struct comedi_device *, struct comedi_subdevice *);
98 int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
99 /* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
100 /* int (*do_unlock)(struct comedi_device *, \
101 struct comedi_subdevice *); */
103 /* called when the buffer changes */
104 int (*buf_change) (struct comedi_device *dev,
105 struct comedi_subdevice *s, unsigned long new_size);
107 void (*munge) (struct comedi_device *dev, struct comedi_subdevice *s,
108 void *data, unsigned int num_bytes,
109 unsigned int start_chan_index);
110 enum dma_data_direction async_dma_dir;
114 struct device *class_dev;
118 struct comedi_buf_page {
123 struct comedi_async {
124 struct comedi_subdevice *subdevice;
126 void *prealloc_buf; /* pre-allocated buffer */
127 unsigned int prealloc_bufsz; /* buffer size, in bytes */
128 /* virtual and dma address of each page */
129 struct comedi_buf_page *buf_page_list;
130 unsigned n_buf_pages; /* num elements in buf_page_list */
132 unsigned int max_bufsize; /* maximum buffer size, bytes */
133 /* current number of mmaps of prealloc_buf */
134 unsigned int mmap_count;
136 /* byte count for writer (write completed) */
137 unsigned int buf_write_count;
138 /* byte count for writer (allocated for writing) */
139 unsigned int buf_write_alloc_count;
140 /* byte count for reader (read completed) */
141 unsigned int buf_read_count;
142 /* byte count for reader (allocated for reading) */
143 unsigned int buf_read_alloc_count;
145 unsigned int buf_write_ptr; /* buffer marker for writer */
146 unsigned int buf_read_ptr; /* buffer marker for reader */
148 unsigned int cur_chan; /* useless channel marker for interrupt */
149 /* number of bytes that have been received for current scan */
150 unsigned int scan_progress;
151 /* keeps track of where we are in chanlist as for munging */
152 unsigned int munge_chan;
153 /* number of bytes that have been munged */
154 unsigned int munge_count;
155 /* buffer marker for munging */
156 unsigned int munge_ptr;
158 unsigned int events; /* events that have occurred */
160 struct comedi_cmd cmd;
162 wait_queue_head_t wait_head;
165 unsigned int cb_mask;
166 int (*cb_func) (unsigned int flags, void *);
169 int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
173 struct comedi_driver {
174 struct comedi_driver *next;
176 const char *driver_name;
177 struct module *module;
178 int (*attach) (struct comedi_device *, struct comedi_devconfig *);
179 void (*detach) (struct comedi_device *);
180 int (*auto_attach) (struct comedi_device *, unsigned long);
182 /* number of elements in board_name and board_id arrays */
183 unsigned int num_names;
184 const char *const *board_name;
185 /* offset in bytes from one board name pointer to the next */
189 struct comedi_device {
191 struct comedi_driver *driver;
194 struct device *class_dev;
196 /* hw_dev is passed to dma_alloc_coherent when allocating async buffers
197 * for subdevices that have async_dma_dir set to something other than
199 struct device *hw_dev;
201 const char *board_name;
202 const void *board_ptr;
204 bool in_request_module:1;
210 struct comedi_subdevice *subdevices;
213 unsigned long iobase;
217 struct comedi_subdevice *read_subdev;
218 struct comedi_subdevice *write_subdev;
220 struct fasync_struct *async_queue;
222 int (*open) (struct comedi_device *dev);
223 void (*close) (struct comedi_device *dev);
226 static inline const void *comedi_board(const struct comedi_device *dev)
228 return dev->board_ptr;
231 #ifdef CONFIG_COMEDI_DEBUG
232 extern int comedi_debug;
234 static const int comedi_debug;
238 * function prototypes
241 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
242 void comedi_error(const struct comedi_device *dev, const char *s);
244 /* we can expand the number of bits used to encode devices/subdevices into
245 the minor number soon, after more distros support > 8 bit minor numbers
246 (like after Debian Etch gets released) */
247 enum comedi_minor_bits {
248 COMEDI_DEVICE_MINOR_MASK = 0xf,
249 COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
251 static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
252 static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
254 struct comedi_device *comedi_dev_from_minor(unsigned minor);
256 void init_polling(void);
257 void cleanup_polling(void);
258 void start_polling(struct comedi_device *);
259 void stop_polling(struct comedi_device *);
261 /* subdevice runflags */
262 enum subdevice_runflags {
263 SRF_USER = 0x00000001,
265 /* indicates an COMEDI_CB_ERROR event has occurred since the last
266 * command was started */
267 SRF_ERROR = 0x00000004,
268 SRF_RUNNING = 0x08000000,
269 SRF_FREE_SPRIV = 0x80000000, /* free s->private on detach */
272 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
274 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
276 int comedi_check_chanlist(struct comedi_subdevice *s,
278 unsigned int *chanlist);
282 #define RANGE(a, b) {(a)*1e6, (b)*1e6, 0}
283 #define RANGE_ext(a, b) {(a)*1e6, (b)*1e6, RF_EXTERNAL}
284 #define RANGE_mA(a, b) {(a)*1e6, (b)*1e6, UNIT_mA}
285 #define RANGE_unitless(a, b) {(a)*1e6, (b)*1e6, 0}
286 #define BIP_RANGE(a) {-(a)*1e6, (a)*1e6, 0}
287 #define UNI_RANGE(a) {0, (a)*1e6, 0}
289 extern const struct comedi_lrange range_bipolar10;
290 extern const struct comedi_lrange range_bipolar5;
291 extern const struct comedi_lrange range_bipolar2_5;
292 extern const struct comedi_lrange range_unipolar10;
293 extern const struct comedi_lrange range_unipolar5;
294 extern const struct comedi_lrange range_unipolar2_5;
295 extern const struct comedi_lrange range_0_20mA;
296 extern const struct comedi_lrange range_4_20mA;
297 extern const struct comedi_lrange range_0_32mA;
298 extern const struct comedi_lrange range_unknown;
300 #define range_digital range_unipolar5
303 #define GCC_ZERO_LENGTH_ARRAY
305 #define GCC_ZERO_LENGTH_ARRAY 0
308 struct comedi_lrange {
310 struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
313 static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
316 return s->range_table->range[range].min < 0;
319 static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
322 return s->range_table->range[range].min >= 0;
325 /* some silly little inline functions */
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 *, short);
351 int comedi_buf_get(struct comedi_async *, 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_alloc_subdevices(struct comedi_device *, int);
362 int comedi_load_firmware(struct comedi_device *, struct device *,
364 int (*cb)(struct comedi_device *,
365 const u8 *data, size_t size,
366 unsigned long context),
367 unsigned long context);
369 int __comedi_request_region(struct comedi_device *,
370 unsigned long start, unsigned long len);
371 int comedi_request_region(struct comedi_device *,
372 unsigned long start, unsigned long len);
373 void comedi_legacy_detach(struct comedi_device *);
375 int comedi_auto_config(struct device *, struct comedi_driver *,
376 unsigned long context);
377 void comedi_auto_unconfig(struct device *);
379 int comedi_driver_register(struct comedi_driver *);
380 int comedi_driver_unregister(struct comedi_driver *);
383 * module_comedi_driver() - Helper macro for registering a comedi driver
384 * @__comedi_driver: comedi_driver struct
386 * Helper macro for comedi drivers which do not do anything special in module
387 * init/exit. This eliminates a lot of boilerplate. Each module may only use
388 * this macro once, and calling it replaces module_init() and module_exit().
390 #define module_comedi_driver(__comedi_driver) \
391 module_driver(__comedi_driver, comedi_driver_register, \
392 comedi_driver_unregister)
394 #ifdef CONFIG_COMEDI_PCI_DRIVERS
396 /* comedi_pci.c - comedi PCI driver specific functions */
399 * PCI Vendor IDs not in <linux/pci_ids.h>
401 #define PCI_VENDOR_ID_KOLTER 0x1001
402 #define PCI_VENDOR_ID_ICP 0x104c
403 #define PCI_VENDOR_ID_AMCC 0x10e8
404 #define PCI_VENDOR_ID_DT 0x1116
405 #define PCI_VENDOR_ID_IOTECH 0x1616
406 #define PCI_VENDOR_ID_CONTEC 0x1221
407 #define PCI_VENDOR_ID_RTD 0x1435
412 struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
414 int comedi_pci_enable(struct comedi_device *);
415 void comedi_pci_disable(struct comedi_device *);
417 int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
418 unsigned long context);
419 void comedi_pci_auto_unconfig(struct pci_dev *);
421 int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
422 void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
425 * module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
426 * @__comedi_driver: comedi_driver struct
427 * @__pci_driver: pci_driver struct
429 * Helper macro for comedi PCI drivers which do not do anything special
430 * in module init/exit. This eliminates a lot of boilerplate. Each
431 * module may only use this macro once, and calling it replaces
432 * module_init() and module_exit()
434 #define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
435 module_driver(__comedi_driver, comedi_pci_driver_register, \
436 comedi_pci_driver_unregister, &(__pci_driver))
441 * Some of the comedi mixed ISA/PCI drivers call the PCI specific
442 * functions. Provide some dummy functions if CONFIG_COMEDI_PCI_DRIVERS
446 static inline struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
451 static inline int comedi_pci_enable(struct comedi_device *dev)
456 static inline void comedi_pci_disable(struct comedi_device *dev)
460 #endif /* CONFIG_COMEDI_PCI_DRIVERS */
462 #ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
464 /* comedi_pcmcia.c - comedi PCMCIA driver specific functions */
466 struct pcmcia_driver;
467 struct pcmcia_device;
469 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *);
471 int comedi_pcmcia_enable(struct comedi_device *,
472 int (*conf_check)(struct pcmcia_device *, void *));
473 void comedi_pcmcia_disable(struct comedi_device *);
475 int comedi_pcmcia_auto_config(struct pcmcia_device *, struct comedi_driver *);
476 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *);
478 int comedi_pcmcia_driver_register(struct comedi_driver *,
479 struct pcmcia_driver *);
480 void comedi_pcmcia_driver_unregister(struct comedi_driver *,
481 struct pcmcia_driver *);
484 * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
485 * @__comedi_driver: comedi_driver struct
486 * @__pcmcia_driver: pcmcia_driver struct
488 * Helper macro for comedi PCMCIA drivers which do not do anything special
489 * in module init/exit. This eliminates a lot of boilerplate. Each
490 * module may only use this macro once, and calling it replaces
491 * module_init() and module_exit()
493 #define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
494 module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
495 comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
497 #endif /* CONFIG_COMEDI_PCMCIA_DRIVERS */
499 #ifdef CONFIG_COMEDI_USB_DRIVERS
501 /* comedi_usb.c - comedi USB driver specific functions */
504 struct usb_interface;
506 struct usb_interface *comedi_to_usb_interface(struct comedi_device *);
507 struct usb_device *comedi_to_usb_dev(struct comedi_device *);
509 int comedi_usb_auto_config(struct usb_interface *, struct comedi_driver *,
510 unsigned long context);
511 void comedi_usb_auto_unconfig(struct usb_interface *);
513 int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
514 void comedi_usb_driver_unregister(struct comedi_driver *, struct usb_driver *);
517 * module_comedi_usb_driver() - Helper macro for registering a comedi USB driver
518 * @__comedi_driver: comedi_driver struct
519 * @__usb_driver: usb_driver struct
521 * Helper macro for comedi USB drivers which do not do anything special
522 * in module init/exit. This eliminates a lot of boilerplate. Each
523 * module may only use this macro once, and calling it replaces
524 * module_init() and module_exit()
526 #define module_comedi_usb_driver(__comedi_driver, __usb_driver) \
527 module_driver(__comedi_driver, comedi_usb_driver_register, \
528 comedi_usb_driver_unregister, &(__usb_driver))
530 #endif /* CONFIG_COMEDI_USB_DRIVERS */
532 #endif /* _COMEDIDEV_H */