600 lines
20 KiB
C
600 lines
20 KiB
C
/*
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include/linux/comedidev.h
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header file for kernel-only structures, variables, and constants
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#ifndef _COMEDIDEV_H
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#define _COMEDIDEV_H
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#include <linux/dma-mapping.h>
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#include <linux/mutex.h>
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#include <linux/spinlock_types.h>
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#include <linux/rwsem.h>
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#include <linux/kref.h>
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#include "comedi.h"
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#define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
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#define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
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COMEDI_MINORVERSION, COMEDI_MICROVERSION)
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#define COMEDI_RELEASE VERSION
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#define COMEDI_NUM_BOARD_MINORS 0x30
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struct comedi_subdevice {
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struct comedi_device *device;
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int index;
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int type;
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int n_chan;
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int subdev_flags;
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int len_chanlist; /* maximum length of channel/gain list */
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void *private;
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struct comedi_async *async;
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void *lock;
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void *busy;
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unsigned runflags;
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spinlock_t spin_lock;
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unsigned int io_bits;
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unsigned int maxdata; /* if maxdata==0, use list */
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const unsigned int *maxdata_list; /* list is channel specific */
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const struct comedi_lrange *range_table;
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const struct comedi_lrange *const *range_table_list;
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unsigned int *chanlist; /* driver-owned chanlist (not used) */
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int (*insn_read)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *);
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int (*insn_write)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *);
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int (*insn_bits)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *);
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int (*insn_config)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *);
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int (*do_cmd)(struct comedi_device *, struct comedi_subdevice *);
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int (*do_cmdtest)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_cmd *);
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int (*poll)(struct comedi_device *, struct comedi_subdevice *);
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int (*cancel)(struct comedi_device *, struct comedi_subdevice *);
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/* called when the buffer changes */
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int (*buf_change)(struct comedi_device *, struct comedi_subdevice *);
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void (*munge)(struct comedi_device *dev, struct comedi_subdevice *s,
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void *data, unsigned int num_bytes,
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unsigned int start_chan_index);
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enum dma_data_direction async_dma_dir;
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unsigned int state;
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struct device *class_dev;
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int minor;
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unsigned int *readback;
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};
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struct comedi_buf_page {
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void *virt_addr;
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dma_addr_t dma_addr;
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};
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struct comedi_buf_map {
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struct device *dma_hw_dev;
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struct comedi_buf_page *page_list;
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unsigned int n_pages;
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enum dma_data_direction dma_dir;
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struct kref refcount;
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};
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/**
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* struct comedi_async - control data for asynchronous comedi commands
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* @prealloc_buf: preallocated buffer
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* @prealloc_bufsz: buffer size (in bytes)
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* @buf_map: map of buffer pages
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* @max_bufsize: maximum buffer size (in bytes)
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* @buf_write_count: "write completed" count (in bytes, modulo 2**32)
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* @buf_write_alloc_count: "allocated for writing" count (in bytes,
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* modulo 2**32)
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* @buf_read_count: "read completed" count (in bytes, modulo 2**32)
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* @buf_read_alloc_count: "allocated for reading" count (in bytes,
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* modulo 2**32)
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* @buf_write_ptr: buffer position for writer
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* @buf_read_ptr: buffer position for reader
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* @cur_chan: current position in chanlist for scan (for those
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* drivers that use it)
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* @scans_done: the number of scans completed (COMEDI_CB_EOS)
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* @scan_progress: amount received or sent for current scan (in bytes)
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* @munge_chan: current position in chanlist for "munging"
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* @munge_count: "munge" count (in bytes, modulo 2**32)
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* @munge_ptr: buffer position for "munging"
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* @events: bit-vector of events that have occurred
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* @cmd: details of comedi command in progress
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* @wait_head: task wait queue for file reader or writer
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* @cb_mask: bit-vector of events that should wake waiting tasks
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* @inttrig: software trigger function for command, or NULL
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*
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* Note about the ..._count and ..._ptr members:
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*
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* Think of the _Count values being integers of unlimited size, indexing
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* into a buffer of infinite length (though only an advancing portion
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* of the buffer of fixed length prealloc_bufsz is accessible at any time).
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* Then:
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*
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* Buf_Read_Count <= Buf_Read_Alloc_Count <= Munge_Count <=
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* Buf_Write_Count <= Buf_Write_Alloc_Count <=
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* (Buf_Read_Count + prealloc_bufsz)
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*
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* (Those aren't the actual members, apart from prealloc_bufsz.) When
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* the buffer is reset, those _Count values start at 0 and only increase
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* in value, maintaining the above inequalities until the next time the
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* buffer is reset. The buffer is divided into the following regions by
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* the inequalities:
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*
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* [0, Buf_Read_Count):
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* old region no longer accessible
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* [Buf_Read_Count, Buf_Read_Alloc_Count):
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* filled and munged region allocated for reading but not yet read
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* [Buf_Read_Alloc_Count, Munge_Count):
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* filled and munged region not yet allocated for reading
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* [Munge_Count, Buf_Write_Count):
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* filled region not yet munged
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* [Buf_Write_Count, Buf_Write_Alloc_Count):
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* unfilled region allocated for writing but not yet written
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* [Buf_Write_Alloc_Count, Buf_Read_Count + prealloc_bufsz):
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* unfilled region not yet allocated for writing
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* [Buf_Read_Count + prealloc_bufsz, infinity):
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* unfilled region not yet accessible
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*
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* Data needs to be written into the buffer before it can be read out,
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* and may need to be converted (or "munged") between the two
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* operations. Extra unfilled buffer space may need to allocated for
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* writing (advancing Buf_Write_Alloc_Count) before new data is written.
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* After writing new data, the newly filled space needs to be released
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* (advancing Buf_Write_Count). This also results in the new data being
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* "munged" (advancing Munge_Count). Before data is read out of the
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* buffer, extra space may need to be allocated for reading (advancing
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* Buf_Read_Alloc_Count). After the data has been read out, the space
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* needs to be released (advancing Buf_Read_Count).
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*
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* The actual members, buf_read_count, buf_read_alloc_count,
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* munge_count, buf_write_count, and buf_write_alloc_count take the
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* value of the corresponding capitalized _Count values modulo 2^32
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* (UINT_MAX+1). Subtracting a "higher" _count value from a "lower"
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* _count value gives the same answer as subtracting a "higher" _Count
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* value from a lower _Count value because prealloc_bufsz < UINT_MAX+1.
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* The modulo operation is done implicitly.
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*
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* The buf_read_ptr, munge_ptr, and buf_write_ptr members take the value
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* of the corresponding capitalized _Count values modulo prealloc_bufsz.
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* These correspond to byte indices in the physical buffer. The modulo
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* operation is done by subtracting prealloc_bufsz when the value
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* exceeds prealloc_bufsz (assuming prealloc_bufsz plus the increment is
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* less than or equal to UINT_MAX).
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*/
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struct comedi_async {
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void *prealloc_buf;
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unsigned int prealloc_bufsz;
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struct comedi_buf_map *buf_map;
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unsigned int max_bufsize;
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unsigned int buf_write_count;
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unsigned int buf_write_alloc_count;
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unsigned int buf_read_count;
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unsigned int buf_read_alloc_count;
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unsigned int buf_write_ptr;
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unsigned int buf_read_ptr;
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unsigned int cur_chan;
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unsigned int scans_done;
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unsigned int scan_progress;
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unsigned int munge_chan;
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unsigned int munge_count;
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unsigned int munge_ptr;
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unsigned int events;
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struct comedi_cmd cmd;
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wait_queue_head_t wait_head;
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unsigned int cb_mask;
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int (*inttrig)(struct comedi_device *dev, struct comedi_subdevice *s,
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unsigned int x);
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};
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/**
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* comedi_async callback "events"
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* @COMEDI_CB_EOS: end-of-scan
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* @COMEDI_CB_EOA: end-of-acquisition/output
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* @COMEDI_CB_BLOCK: data has arrived, wakes up read() / write()
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* @COMEDI_CB_EOBUF: DEPRECATED: end of buffer
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* @COMEDI_CB_ERROR: card error during acquisition
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* @COMEDI_CB_OVERFLOW: buffer overflow/underflow
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*
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* @COMEDI_CB_ERROR_MASK: events that indicate an error has occurred
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* @COMEDI_CB_CANCEL_MASK: events that will cancel an async command
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*/
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#define COMEDI_CB_EOS (1 << 0)
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#define COMEDI_CB_EOA (1 << 1)
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#define COMEDI_CB_BLOCK (1 << 2)
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#define COMEDI_CB_EOBUF (1 << 3)
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#define COMEDI_CB_ERROR (1 << 4)
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#define COMEDI_CB_OVERFLOW (1 << 5)
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#define COMEDI_CB_ERROR_MASK (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)
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#define COMEDI_CB_CANCEL_MASK (COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK)
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struct comedi_driver {
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struct comedi_driver *next;
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const char *driver_name;
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struct module *module;
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int (*attach)(struct comedi_device *, struct comedi_devconfig *);
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void (*detach)(struct comedi_device *);
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int (*auto_attach)(struct comedi_device *, unsigned long);
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/* number of elements in board_name and board_id arrays */
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unsigned int num_names;
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const char *const *board_name;
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/* offset in bytes from one board name pointer to the next */
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int offset;
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};
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struct comedi_device {
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int use_count;
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struct comedi_driver *driver;
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void *private;
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struct device *class_dev;
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int minor;
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unsigned int detach_count;
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/* hw_dev is passed to dma_alloc_coherent when allocating async buffers
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* for subdevices that have async_dma_dir set to something other than
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* DMA_NONE */
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struct device *hw_dev;
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const char *board_name;
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const void *board_ptr;
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bool attached:1;
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bool ioenabled:1;
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spinlock_t spinlock;
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struct mutex mutex;
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struct rw_semaphore attach_lock;
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struct kref refcount;
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int n_subdevices;
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struct comedi_subdevice *subdevices;
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/* dumb */
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void __iomem *mmio;
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unsigned long iobase;
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unsigned long iolen;
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unsigned int irq;
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struct comedi_subdevice *read_subdev;
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struct comedi_subdevice *write_subdev;
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struct fasync_struct *async_queue;
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int (*open)(struct comedi_device *dev);
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void (*close)(struct comedi_device *dev);
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};
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/*
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* function prototypes
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*/
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void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
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struct comedi_device *comedi_dev_get_from_minor(unsigned minor);
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int comedi_dev_put(struct comedi_device *dev);
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/**
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* comedi_subdevice "runflags"
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* @COMEDI_SRF_RT: DEPRECATED: command is running real-time
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* @COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred
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* since the last command was started
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* @COMEDI_SRF_RUNNING: command is running
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* @COMEDI_SRF_FREE_SPRIV: free s->private on detach
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*
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* @COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy"
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*/
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#define COMEDI_SRF_RT BIT(1)
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#define COMEDI_SRF_ERROR BIT(2)
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#define COMEDI_SRF_RUNNING BIT(27)
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#define COMEDI_SRF_FREE_SPRIV BIT(31)
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#define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING)
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bool comedi_is_subdevice_running(struct comedi_subdevice *s);
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void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
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int comedi_check_chanlist(struct comedi_subdevice *s,
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int n,
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unsigned int *chanlist);
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/* range stuff */
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#define RANGE(a, b) {(a)*1e6, (b)*1e6, 0}
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#define RANGE_ext(a, b) {(a)*1e6, (b)*1e6, RF_EXTERNAL}
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#define RANGE_mA(a, b) {(a)*1e6, (b)*1e6, UNIT_mA}
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#define RANGE_unitless(a, b) {(a)*1e6, (b)*1e6, 0}
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#define BIP_RANGE(a) {-(a)*1e6, (a)*1e6, 0}
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#define UNI_RANGE(a) {0, (a)*1e6, 0}
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extern const struct comedi_lrange range_bipolar10;
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extern const struct comedi_lrange range_bipolar5;
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extern const struct comedi_lrange range_bipolar2_5;
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extern const struct comedi_lrange range_unipolar10;
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extern const struct comedi_lrange range_unipolar5;
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extern const struct comedi_lrange range_unipolar2_5;
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extern const struct comedi_lrange range_0_20mA;
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extern const struct comedi_lrange range_4_20mA;
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extern const struct comedi_lrange range_0_32mA;
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extern const struct comedi_lrange range_unknown;
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#define range_digital range_unipolar5
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#if __GNUC__ >= 3
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#define GCC_ZERO_LENGTH_ARRAY
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#else
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#define GCC_ZERO_LENGTH_ARRAY 0
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#endif
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struct comedi_lrange {
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int length;
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struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
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};
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static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
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unsigned int range)
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{
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return s->range_table->range[range].min < 0;
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}
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static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
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unsigned int range)
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{
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return s->range_table->range[range].min >= 0;
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}
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static inline bool comedi_range_is_external(struct comedi_subdevice *s,
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unsigned int range)
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{
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return !!(s->range_table->range[range].flags & RF_EXTERNAL);
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}
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static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
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unsigned int chan,
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unsigned int range)
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{
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return s->range_table_list[chan]->range[range].min < 0;
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}
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static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
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unsigned int chan,
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unsigned int range)
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{
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return s->range_table_list[chan]->range[range].min >= 0;
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}
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static inline bool comedi_chan_range_is_external(struct comedi_subdevice *s,
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unsigned int chan,
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unsigned int range)
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{
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return !!(s->range_table_list[chan]->range[range].flags & RF_EXTERNAL);
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}
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/* munge between offset binary and two's complement values */
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static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
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unsigned int val)
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{
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return val ^ s->maxdata ^ (s->maxdata >> 1);
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}
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/**
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* comedi_bytes_per_sample - determine subdevice sample size
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* @s: comedi_subdevice struct
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*
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* The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
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* whether the SDF_LSAMPL subdevice flag is set or not.
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*
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* Returns the subdevice sample size.
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*/
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static inline unsigned int comedi_bytes_per_sample(struct comedi_subdevice *s)
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{
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return s->subdev_flags & SDF_LSAMPL ? sizeof(int) : sizeof(short);
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}
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/**
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* comedi_sample_shift - determine log2 of subdevice sample size
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* @s: comedi_subdevice struct
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*
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* The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
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* whether the SDF_LSAMPL subdevice flag is set or not. The log2 of the
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* sample size will be 2 or 1 and can be used as the right operand of a
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* bit-shift operator to multiply or divide something by the sample size.
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*
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* Returns log2 of the subdevice sample size.
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*/
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static inline unsigned int comedi_sample_shift(struct comedi_subdevice *s)
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{
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return s->subdev_flags & SDF_LSAMPL ? 2 : 1;
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}
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/**
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* comedi_bytes_to_samples - converts a number of bytes to a number of samples
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* @s: comedi_subdevice struct
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* @nbytes: number of bytes
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*
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* Returns the number of bytes divided by the subdevice sample size.
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*/
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static inline unsigned int comedi_bytes_to_samples(struct comedi_subdevice *s,
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unsigned int nbytes)
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{
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return nbytes >> comedi_sample_shift(s);
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}
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/**
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* comedi_samples_to_bytes - converts a number of samples to a number of bytes
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* @s: comedi_subdevice struct
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* @nsamples: number of samples
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*
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* Returns the number of samples multiplied by the subdevice sample size.
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* Does not check for arithmetic overflow.
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*/
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static inline unsigned int comedi_samples_to_bytes(struct comedi_subdevice *s,
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unsigned int nsamples)
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{
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return nsamples << comedi_sample_shift(s);
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}
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/*
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* Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
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* Also useful for retrieving a previously configured hardware device of
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* known bus type. Set automatically for auto-configured devices.
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* Automatically set to NULL when detaching hardware device.
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*/
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int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
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static inline unsigned int comedi_buf_n_bytes_ready(struct comedi_subdevice *s)
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{
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return s->async->buf_write_count - s->async->buf_read_count;
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}
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unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s, unsigned int n);
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unsigned int comedi_buf_write_free(struct comedi_subdevice *s, unsigned int n);
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unsigned int comedi_buf_read_n_available(struct comedi_subdevice *s);
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unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s, unsigned int n);
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unsigned int comedi_buf_read_free(struct comedi_subdevice *s, unsigned int n);
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unsigned int comedi_buf_write_samples(struct comedi_subdevice *s,
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const void *data, unsigned int nsamples);
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unsigned int comedi_buf_read_samples(struct comedi_subdevice *s,
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void *data, unsigned int nsamples);
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/* drivers.c - general comedi driver functions */
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#define COMEDI_TIMEOUT_MS 1000
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int comedi_timeout(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *,
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int (*cb)(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned long context),
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unsigned long context);
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unsigned int comedi_handle_events(struct comedi_device *dev,
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struct comedi_subdevice *s);
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|
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int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *data,
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unsigned int mask);
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unsigned int comedi_dio_update_state(struct comedi_subdevice *,
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unsigned int *data);
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unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s);
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unsigned int comedi_nscans_left(struct comedi_subdevice *s,
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|
unsigned int nscans);
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unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
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|
unsigned int nsamples);
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void comedi_inc_scan_progress(struct comedi_subdevice *s,
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|
unsigned int num_bytes);
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|
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void *comedi_alloc_devpriv(struct comedi_device *, size_t);
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int comedi_alloc_subdevices(struct comedi_device *, int);
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int comedi_alloc_subdev_readback(struct comedi_subdevice *);
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|
|
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int comedi_readback_insn_read(struct comedi_device *, struct comedi_subdevice *,
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struct comedi_insn *, unsigned int *data);
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|
|
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int comedi_load_firmware(struct comedi_device *, struct device *,
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|
const char *name,
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int (*cb)(struct comedi_device *,
|
|
const u8 *data, size_t size,
|
|
unsigned long context),
|
|
unsigned long context);
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|
|
|
int __comedi_request_region(struct comedi_device *,
|
|
unsigned long start, unsigned long len);
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int comedi_request_region(struct comedi_device *,
|
|
unsigned long start, unsigned long len);
|
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void comedi_legacy_detach(struct comedi_device *);
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|
|
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int comedi_auto_config(struct device *, struct comedi_driver *,
|
|
unsigned long context);
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void comedi_auto_unconfig(struct device *);
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|
|
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int comedi_driver_register(struct comedi_driver *);
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|
void comedi_driver_unregister(struct comedi_driver *);
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|
|
|
/**
|
|
* module_comedi_driver() - Helper macro for registering a comedi driver
|
|
* @__comedi_driver: comedi_driver struct
|
|
*
|
|
* Helper macro for comedi drivers which do not do anything special in module
|
|
* init/exit. This eliminates a lot of boilerplate. Each module may only use
|
|
* this macro once, and calling it replaces module_init() and module_exit().
|
|
*/
|
|
#define module_comedi_driver(__comedi_driver) \
|
|
module_driver(__comedi_driver, comedi_driver_register, \
|
|
comedi_driver_unregister)
|
|
|
|
/* comedi_pci.c - comedi PCI driver specific functions */
|
|
|
|
/*
|
|
* PCI Vendor IDs not in <linux/pci_ids.h>
|
|
*/
|
|
#define PCI_VENDOR_ID_KOLTER 0x1001
|
|
#define PCI_VENDOR_ID_ICP 0x104c
|
|
#define PCI_VENDOR_ID_DT 0x1116
|
|
#define PCI_VENDOR_ID_IOTECH 0x1616
|
|
#define PCI_VENDOR_ID_CONTEC 0x1221
|
|
#define PCI_VENDOR_ID_RTD 0x1435
|
|
#define PCI_VENDOR_ID_HUMUSOFT 0x186c
|
|
|
|
struct pci_dev;
|
|
struct pci_driver;
|
|
|
|
struct pci_dev *comedi_to_pci_dev(struct comedi_device *);
|
|
|
|
int comedi_pci_enable(struct comedi_device *);
|
|
void comedi_pci_disable(struct comedi_device *);
|
|
void comedi_pci_detach(struct comedi_device *);
|
|
|
|
int comedi_pci_auto_config(struct pci_dev *, struct comedi_driver *,
|
|
unsigned long context);
|
|
void comedi_pci_auto_unconfig(struct pci_dev *);
|
|
|
|
int comedi_pci_driver_register(struct comedi_driver *, struct pci_driver *);
|
|
void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
|
|
|
|
/**
|
|
* module_comedi_pci_driver() - Helper macro for registering a comedi PCI driver
|
|
* @__comedi_driver: comedi_driver struct
|
|
* @__pci_driver: pci_driver struct
|
|
*
|
|
* Helper macro for comedi PCI drivers which do not do anything special
|
|
* in module init/exit. This eliminates a lot of boilerplate. Each
|
|
* module may only use this macro once, and calling it replaces
|
|
* module_init() and module_exit()
|
|
*/
|
|
#define module_comedi_pci_driver(__comedi_driver, __pci_driver) \
|
|
module_driver(__comedi_driver, comedi_pci_driver_register, \
|
|
comedi_pci_driver_unregister, &(__pci_driver))
|
|
|
|
#endif /* _COMEDIDEV_H */
|