1055 lines
41 KiB
C
1055 lines
41 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* comedidev.h
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* header file for kernel-only structures, variables, and constants
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*
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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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*/
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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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/**
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* struct comedi_subdevice - Working data for a COMEDI subdevice
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* @device: COMEDI device to which this subdevice belongs. (Initialized by
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* comedi_alloc_subdevices().)
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* @index: Index of this subdevice within device's array of subdevices.
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* (Initialized by comedi_alloc_subdevices().)
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* @type: Type of subdevice from &enum comedi_subdevice_type. (Initialized by
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* the low-level driver.)
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* @n_chan: Number of channels the subdevice supports. (Initialized by the
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* low-level driver.)
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* @subdev_flags: Various "SDF" flags indicating aspects of the subdevice to
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* the COMEDI core and user application. (Initialized by the low-level
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* driver.)
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* @len_chanlist: Maximum length of a channel list if the subdevice supports
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* asynchronous acquisition commands. (Optionally initialized by the
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* low-level driver, or changed from 0 to 1 during post-configuration.)
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* @private: Private data pointer which is either set by the low-level driver
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* itself, or by a call to comedi_alloc_spriv() which allocates storage.
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* In the latter case, the storage is automatically freed after the
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* low-level driver's "detach" handler is called for the device.
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* (Initialized by the low-level driver.)
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* @async: Pointer to &struct comedi_async id the subdevice supports
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* asynchronous acquisition commands. (Allocated and initialized during
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* post-configuration if needed.)
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* @lock: Pointer to a file object that performed a %COMEDI_LOCK ioctl on the
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* subdevice. (Initially NULL.)
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* @busy: Pointer to a file object that is performing an asynchronous
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* acquisition command on the subdevice. (Initially NULL.)
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* @runflags: Internal flags for use by COMEDI core, mostly indicating whether
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* an asynchronous acquisition command is running.
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* @spin_lock: Generic spin-lock for use by the COMEDI core and the low-level
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* driver. (Initialized by comedi_alloc_subdevices().)
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* @io_bits: Bit-mask indicating the channel directions for a DIO subdevice
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* with no more than 32 channels. A '1' at a bit position indicates the
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* corresponding channel is configured as an output. (Initialized by the
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* low-level driver for a DIO subdevice. Forced to all-outputs during
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* post-configuration for a digital output subdevice.)
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* @maxdata: If non-zero, this is the maximum raw data value of each channel.
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* If zero, the maximum data value is channel-specific. (Initialized by
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* the low-level driver.)
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* @maxdata_list: If the maximum data value is channel-specific, this points
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* to an array of maximum data values indexed by channel index.
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* (Initialized by the low-level driver.)
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* @range_table: If non-NULL, this points to a COMEDI range table for the
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* subdevice. If NULL, the range table is channel-specific. (Initialized
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* by the low-level driver, will be set to an "invalid" range table during
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* post-configuration if @range_table and @range_table_list are both
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* NULL.)
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* @range_table_list: If the COMEDI range table is channel-specific, this
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* points to an array of pointers to COMEDI range tables indexed by
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* channel number. (Initialized by the low-level driver.)
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* @chanlist: Not used.
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* @insn_read: Optional pointer to a handler for the %INSN_READ instruction.
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* (Initialized by the low-level driver, or set to a default handler
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* during post-configuration.)
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* @insn_write: Optional pointer to a handler for the %INSN_WRITE instruction.
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* (Initialized by the low-level driver, or set to a default handler
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* during post-configuration.)
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* @insn_bits: Optional pointer to a handler for the %INSN_BITS instruction
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* for a digital input, digital output or digital input/output subdevice.
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* (Initialized by the low-level driver, or set to a default handler
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* during post-configuration.)
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* @insn_config: Optional pointer to a handler for the %INSN_CONFIG
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* instruction. (Initialized by the low-level driver, or set to a default
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* handler during post-configuration.)
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* @do_cmd: If the subdevice supports asynchronous acquisition commands, this
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* points to a handler to set it up in hardware. (Initialized by the
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* low-level driver.)
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* @do_cmdtest: If the subdevice supports asynchronous acquisition commands,
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* this points to a handler used to check and possibly tweak a prospective
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* acquisition command without setting it up in hardware. (Initialized by
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* the low-level driver.)
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* @poll: If the subdevice supports asynchronous acquisition commands, this
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* is an optional pointer to a handler for the %COMEDI_POLL ioctl which
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* instructs the low-level driver to synchronize buffers. (Initialized by
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* the low-level driver if needed.)
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* @cancel: If the subdevice supports asynchronous acquisition commands, this
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* points to a handler used to terminate a running command. (Initialized
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* by the low-level driver.)
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* @buf_change: If the subdevice supports asynchronous acquisition commands,
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* this is an optional pointer to a handler that is called when the data
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* buffer for handling asynchronous commands is allocated or reallocated.
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* (Initialized by the low-level driver if needed.)
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* @munge: If the subdevice supports asynchronous acquisition commands and
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* uses DMA to transfer data from the hardware to the acquisition buffer,
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* this points to a function used to "munge" the data values from the
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* hardware into the format expected by COMEDI. (Initialized by the
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* low-level driver if needed.)
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* @async_dma_dir: If the subdevice supports asynchronous acquisition commands
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* and uses DMA to transfer data from the hardware to the acquisition
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* buffer, this sets the DMA direction for the buffer. (initialized to
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* %DMA_NONE by comedi_alloc_subdevices() and changed by the low-level
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* driver if necessary.)
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* @state: Handy bit-mask indicating the output states for a DIO or digital
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* output subdevice with no more than 32 channels. (Initialized by the
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* low-level driver.)
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* @class_dev: If the subdevice supports asynchronous acquisition commands,
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* this points to a sysfs comediX_subdY device where X is the minor device
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* number of the COMEDI device and Y is the subdevice number. The minor
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* device number for the sysfs device is allocated dynamically in the
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* range 48 to 255. This is used to allow the COMEDI device to be opened
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* with a different default read or write subdevice. (Allocated during
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* post-configuration if needed.)
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* @minor: If @class_dev is set, this is its dynamically allocated minor
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* device number. (Set during post-configuration if necessary.)
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* @readback: Optional pointer to memory allocated by
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* comedi_alloc_subdev_readback() used to hold the values written to
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* analog output channels so they can be read back. The storage is
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* automatically freed after the low-level driver's "detach" handler is
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* called for the device. (Initialized by the low-level driver.)
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*
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* This is the main control structure for a COMEDI subdevice. If the subdevice
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* supports asynchronous acquisition commands, additional information is stored
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* in the &struct comedi_async pointed to by @async.
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*
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* Most of the subdevice is initialized by the low-level driver's "attach" or
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* "auto_attach" handlers but parts of it are initialized by
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* comedi_alloc_subdevices(), and other parts are initialized during
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* post-configuration on return from that handler.
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*
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* A low-level driver that sets @insn_bits for a digital input, digital output,
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* or DIO subdevice may leave @insn_read and @insn_write uninitialized, in
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* which case they will be set to a default handler during post-configuration
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* that uses @insn_bits to emulate the %INSN_READ and %INSN_WRITE instructions.
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*/
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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 int runflags;
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spinlock_t spin_lock; /* generic spin-lock for COMEDI and drivers */
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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 *dev, struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data);
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int (*insn_write)(struct comedi_device *dev, struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data);
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int (*insn_bits)(struct comedi_device *dev, struct comedi_subdevice *s,
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struct comedi_insn *insn, unsigned int *data);
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int (*insn_config)(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data);
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int (*do_cmd)(struct comedi_device *dev, struct comedi_subdevice *s);
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int (*do_cmdtest)(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_cmd *cmd);
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int (*poll)(struct comedi_device *dev, struct comedi_subdevice *s);
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int (*cancel)(struct comedi_device *dev, struct comedi_subdevice *s);
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/* called when the buffer changes */
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int (*buf_change)(struct comedi_device *dev,
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struct comedi_subdevice *s);
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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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/**
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* struct comedi_buf_page - Describe a page of a COMEDI buffer
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* @virt_addr: Kernel address of page.
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* @dma_addr: DMA address of page if in DMA coherent memory.
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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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/**
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* struct comedi_buf_map - Describe pages in a COMEDI buffer
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* @dma_hw_dev: Low-level hardware &struct device pointer copied from the
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* COMEDI device's hw_dev member.
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* @page_list: Pointer to array of &struct comedi_buf_page, one for each
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* page in the buffer.
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* @n_pages: Number of pages in the buffer.
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* @dma_dir: DMA direction used to allocate pages of DMA coherent memory,
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* or %DMA_NONE if pages allocated from regular memory.
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* @refcount: &struct kref reference counter used to free the buffer.
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*
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* A COMEDI data buffer is allocated as individual pages, either in
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* conventional memory or DMA coherent memory, depending on the attached,
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* low-level hardware device. (The buffer pages also get mapped into the
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* kernel's contiguous virtual address space pointed to by the 'prealloc_buf'
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* member of &struct comedi_async.)
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*
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* The buffer is normally freed when the COMEDI device is detached from the
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* low-level driver (which may happen due to device removal), but if it happens
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* to be mmapped at the time, the pages cannot be freed until the buffer has
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* been munmapped. That is what the reference counter is for. (The virtual
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* address space pointed by 'prealloc_buf' is freed when the COMEDI device is
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* detached.)
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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: Kernel virtual address of allocated acquisition 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 allowed 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 drivers that
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* use it).
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* @scans_done: The number of scans completed.
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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
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* time). 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 the
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* buffer is reset, those _Count values start at 0 and only increase in value,
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* maintaining the above inequalities until the next time the buffer is
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* reset. The buffer is divided into the following regions by 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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*
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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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*
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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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*
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* [Munge_Count, Buf_Write_Count):
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* filled region not yet munged
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*
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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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*
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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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*
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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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* enum comedi_cb - &struct 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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* @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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enum comedi_cb {
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COMEDI_CB_EOS = BIT(0),
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COMEDI_CB_EOA = BIT(1),
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COMEDI_CB_BLOCK = BIT(2),
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COMEDI_CB_EOBUF = BIT(3),
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COMEDI_CB_ERROR = BIT(4),
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COMEDI_CB_OVERFLOW = BIT(5),
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/* masks */
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COMEDI_CB_ERROR_MASK = (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW),
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COMEDI_CB_CANCEL_MASK = (COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK)
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};
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/**
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* struct comedi_driver - COMEDI driver registration
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* @driver_name: Name of driver.
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* @module: Owning module.
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* @attach: The optional "attach" handler for manually configured COMEDI
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* devices.
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* @detach: The "detach" handler for deconfiguring COMEDI devices.
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* @auto_attach: The optional "auto_attach" handler for automatically
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* configured COMEDI devices.
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* @num_names: Optional number of "board names" supported.
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* @board_name: Optional pointer to a pointer to a board name. The pointer
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* to a board name is embedded in an element of a driver-defined array
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* of static, read-only board type information.
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* @offset: Optional size of each element of the driver-defined array of
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* static, read-only board type information, i.e. the offset between each
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* pointer to a board name.
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*
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* This is used with comedi_driver_register() and comedi_driver_unregister() to
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* register and unregister a low-level COMEDI driver with the COMEDI core.
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*
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* If @num_names is non-zero, @board_name should be non-NULL, and @offset
|
|
* should be at least sizeof(*board_name). These are used by the handler for
|
|
* the %COMEDI_DEVCONFIG ioctl to match a hardware device and its driver by
|
|
* board name. If @num_names is zero, the %COMEDI_DEVCONFIG ioctl matches a
|
|
* hardware device and its driver by driver name. This is only useful if the
|
|
* @attach handler is set. If @num_names is non-zero, the driver's @attach
|
|
* handler will be called with the COMEDI device structure's board_ptr member
|
|
* pointing to the matched pointer to a board name within the driver's private
|
|
* array of static, read-only board type information.
|
|
*
|
|
* The @detach handler has two roles. If a COMEDI device was successfully
|
|
* configured by the @attach or @auto_attach handler, it is called when the
|
|
* device is being deconfigured (by the %COMEDI_DEVCONFIG ioctl, or due to
|
|
* unloading of the driver, or due to device removal). It is also called when
|
|
* the @attach or @auto_attach handler returns an error. Therefore, the
|
|
* @attach or @auto_attach handlers can defer clean-up on error until the
|
|
* @detach handler is called. If the @attach or @auto_attach handlers free
|
|
* any resources themselves, they must prevent the @detach handler from
|
|
* freeing the same resources. The @detach handler must not assume that all
|
|
* resources requested by the @attach or @auto_attach handler were
|
|
* successfully allocated.
|
|
*/
|
|
struct comedi_driver {
|
|
/* private: */
|
|
struct comedi_driver *next; /* Next in list of COMEDI drivers. */
|
|
/* public: */
|
|
const char *driver_name;
|
|
struct module *module;
|
|
int (*attach)(struct comedi_device *dev, struct comedi_devconfig *it);
|
|
void (*detach)(struct comedi_device *dev);
|
|
int (*auto_attach)(struct comedi_device *dev, unsigned long context);
|
|
unsigned int num_names;
|
|
const char *const *board_name;
|
|
int offset;
|
|
};
|
|
|
|
/**
|
|
* struct comedi_device - Working data for a COMEDI device
|
|
* @use_count: Number of open file objects.
|
|
* @driver: Low-level COMEDI driver attached to this COMEDI device.
|
|
* @pacer: Optional pointer to a dynamically allocated acquisition pacer
|
|
* control. It is freed automatically after the COMEDI device is
|
|
* detached from the low-level driver.
|
|
* @private: Optional pointer to private data allocated by the low-level
|
|
* driver. It is freed automatically after the COMEDI device is
|
|
* detached from the low-level driver.
|
|
* @class_dev: Sysfs comediX device.
|
|
* @minor: Minor device number of COMEDI char device (0-47).
|
|
* @detach_count: Counter incremented every time the COMEDI device is detached.
|
|
* Used for checking a previous attachment is still valid.
|
|
* @hw_dev: Optional pointer to the low-level hardware &struct device. It is
|
|
* required for automatically configured COMEDI devices and optional for
|
|
* COMEDI devices configured by the %COMEDI_DEVCONFIG ioctl, although
|
|
* the bus-specific COMEDI functions only work if it is set correctly.
|
|
* It is also passed to dma_alloc_coherent() for COMEDI subdevices that
|
|
* have their 'async_dma_dir' member set to something other than
|
|
* %DMA_NONE.
|
|
* @board_name: Pointer to a COMEDI board name or a COMEDI driver name. When
|
|
* the low-level driver's "attach" handler is called by the handler for
|
|
* the %COMEDI_DEVCONFIG ioctl, it either points to a matched board name
|
|
* string if the 'num_names' member of the &struct comedi_driver is
|
|
* non-zero, otherwise it points to the low-level driver name string.
|
|
* When the low-lever driver's "auto_attach" handler is called for an
|
|
* automatically configured COMEDI device, it points to the low-level
|
|
* driver name string. The low-level driver is free to change it in its
|
|
* "attach" or "auto_attach" handler if it wishes.
|
|
* @board_ptr: Optional pointer to private, read-only board type information in
|
|
* the low-level driver. If the 'num_names' member of the &struct
|
|
* comedi_driver is non-zero, the handler for the %COMEDI_DEVCONFIG ioctl
|
|
* will point it to a pointer to a matched board name string within the
|
|
* driver's private array of static, read-only board type information when
|
|
* calling the driver's "attach" handler. The low-level driver is free to
|
|
* change it.
|
|
* @attached: Flag indicating that the COMEDI device is attached to a low-level
|
|
* driver.
|
|
* @ioenabled: Flag used to indicate that a PCI device has been enabled and
|
|
* its regions requested.
|
|
* @spinlock: Generic spin-lock for use by the low-level driver.
|
|
* @mutex: Generic mutex for use by the COMEDI core module.
|
|
* @attach_lock: &struct rw_semaphore used to guard against the COMEDI device
|
|
* being detached while an operation is in progress. The down_write()
|
|
* operation is only allowed while @mutex is held and is used when
|
|
* changing @attached and @detach_count and calling the low-level driver's
|
|
* "detach" handler. The down_read() operation is generally used without
|
|
* holding @mutex.
|
|
* @refcount: &struct kref reference counter for freeing COMEDI device.
|
|
* @n_subdevices: Number of COMEDI subdevices allocated by the low-level
|
|
* driver for this device.
|
|
* @subdevices: Dynamically allocated array of COMEDI subdevices.
|
|
* @mmio: Optional pointer to a remapped MMIO region set by the low-level
|
|
* driver.
|
|
* @iobase: Optional base of an I/O port region requested by the low-level
|
|
* driver.
|
|
* @iolen: Length of I/O port region requested at @iobase.
|
|
* @irq: Optional IRQ number requested by the low-level driver.
|
|
* @read_subdev: Optional pointer to a default COMEDI subdevice operated on by
|
|
* the read() file operation. Set by the low-level driver.
|
|
* @write_subdev: Optional pointer to a default COMEDI subdevice operated on by
|
|
* the write() file operation. Set by the low-level driver.
|
|
* @async_queue: Storage for fasync_helper().
|
|
* @open: Optional pointer to a function set by the low-level driver to be
|
|
* called when @use_count changes from 0 to 1.
|
|
* @close: Optional pointer to a function set by the low-level driver to be
|
|
* called when @use_count changed from 1 to 0.
|
|
* @insn_device_config: Optional pointer to a handler for all sub-instructions
|
|
* except %INSN_DEVICE_CONFIG_GET_ROUTES of the %INSN_DEVICE_CONFIG
|
|
* instruction. If this is not initialized by the low-level driver, a
|
|
* default handler will be set during post-configuration.
|
|
* @get_valid_routes: Optional pointer to a handler for the
|
|
* %INSN_DEVICE_CONFIG_GET_ROUTES sub-instruction of the
|
|
* %INSN_DEVICE_CONFIG instruction set. If this is not initialized by the
|
|
* low-level driver, a default handler that copies zero routes back to the
|
|
* user will be used.
|
|
*
|
|
* This is the main control data structure for a COMEDI device (as far as the
|
|
* COMEDI core is concerned). There are two groups of COMEDI devices -
|
|
* "legacy" devices that are configured by the handler for the
|
|
* %COMEDI_DEVCONFIG ioctl, and automatically configured devices resulting
|
|
* from a call to comedi_auto_config() as a result of a bus driver probe in
|
|
* a low-level COMEDI driver. The "legacy" COMEDI devices are allocated
|
|
* during module initialization if the "comedi_num_legacy_minors" module
|
|
* parameter is non-zero and use minor device numbers from 0 to
|
|
* comedi_num_legacy_minors minus one. The automatically configured COMEDI
|
|
* devices are allocated on demand and use minor device numbers from
|
|
* comedi_num_legacy_minors to 47.
|
|
*/
|
|
struct comedi_device {
|
|
int use_count;
|
|
struct comedi_driver *driver;
|
|
struct comedi_8254 *pacer;
|
|
void *private;
|
|
|
|
struct device *class_dev;
|
|
int minor;
|
|
unsigned int detach_count;
|
|
struct device *hw_dev;
|
|
|
|
const char *board_name;
|
|
const void *board_ptr;
|
|
unsigned int attached:1;
|
|
unsigned int ioenabled:1;
|
|
spinlock_t spinlock; /* generic spin-lock for low-level driver */
|
|
struct mutex mutex; /* generic mutex for COMEDI core */
|
|
struct rw_semaphore attach_lock;
|
|
struct kref refcount;
|
|
|
|
int n_subdevices;
|
|
struct comedi_subdevice *subdevices;
|
|
|
|
/* dumb */
|
|
void __iomem *mmio;
|
|
unsigned long iobase;
|
|
unsigned long iolen;
|
|
unsigned int irq;
|
|
|
|
struct comedi_subdevice *read_subdev;
|
|
struct comedi_subdevice *write_subdev;
|
|
|
|
struct fasync_struct *async_queue;
|
|
|
|
int (*open)(struct comedi_device *dev);
|
|
void (*close)(struct comedi_device *dev);
|
|
int (*insn_device_config)(struct comedi_device *dev,
|
|
struct comedi_insn *insn, unsigned int *data);
|
|
unsigned int (*get_valid_routes)(struct comedi_device *dev,
|
|
unsigned int n_pairs,
|
|
unsigned int *pair_data);
|
|
};
|
|
|
|
/*
|
|
* function prototypes
|
|
*/
|
|
|
|
void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
|
|
|
|
struct comedi_device *comedi_dev_get_from_minor(unsigned int minor);
|
|
int comedi_dev_put(struct comedi_device *dev);
|
|
|
|
bool comedi_is_subdevice_running(struct comedi_subdevice *s);
|
|
|
|
void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
|
|
void comedi_set_spriv_auto_free(struct comedi_subdevice *s);
|
|
|
|
int comedi_check_chanlist(struct comedi_subdevice *s,
|
|
int n,
|
|
unsigned int *chanlist);
|
|
|
|
/* range stuff */
|
|
|
|
#define RANGE(a, b) {(a) * 1e6, (b) * 1e6, 0}
|
|
#define RANGE_ext(a, b) {(a) * 1e6, (b) * 1e6, RF_EXTERNAL}
|
|
#define RANGE_mA(a, b) {(a) * 1e6, (b) * 1e6, UNIT_mA}
|
|
#define RANGE_unitless(a, b) {(a) * 1e6, (b) * 1e6, 0}
|
|
#define BIP_RANGE(a) {-(a) * 1e6, (a) * 1e6, 0}
|
|
#define UNI_RANGE(a) {0, (a) * 1e6, 0}
|
|
|
|
extern const struct comedi_lrange range_bipolar10;
|
|
extern const struct comedi_lrange range_bipolar5;
|
|
extern const struct comedi_lrange range_bipolar2_5;
|
|
extern const struct comedi_lrange range_unipolar10;
|
|
extern const struct comedi_lrange range_unipolar5;
|
|
extern const struct comedi_lrange range_unipolar2_5;
|
|
extern const struct comedi_lrange range_0_20mA;
|
|
extern const struct comedi_lrange range_4_20mA;
|
|
extern const struct comedi_lrange range_0_32mA;
|
|
extern const struct comedi_lrange range_unknown;
|
|
|
|
#define range_digital range_unipolar5
|
|
|
|
/**
|
|
* struct comedi_lrange - Describes a COMEDI range table
|
|
* @length: Number of entries in the range table.
|
|
* @range: Array of &struct comedi_krange, one for each range.
|
|
*
|
|
* Each element of @range[] describes the minimum and maximum physical range
|
|
* and the type of units. Typically, the type of unit is %UNIT_volt
|
|
* (i.e. volts) and the minimum and maximum are in millionths of a volt.
|
|
* There may also be a flag that indicates the minimum and maximum are merely
|
|
* scale factors for an unknown, external reference.
|
|
*/
|
|
struct comedi_lrange {
|
|
int length;
|
|
struct comedi_krange range[];
|
|
};
|
|
|
|
/**
|
|
* comedi_range_is_bipolar() - Test if subdevice range is bipolar
|
|
* @s: COMEDI subdevice.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is bipolar by checking whether its minimum value
|
|
* is negative.
|
|
*
|
|
* Assumes @range is valid. Does not work for subdevices using a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is bipolar.
|
|
* %false if the range is unipolar.
|
|
*/
|
|
static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
|
|
unsigned int range)
|
|
{
|
|
return s->range_table->range[range].min < 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_range_is_unipolar() - Test if subdevice range is unipolar
|
|
* @s: COMEDI subdevice.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is unipolar by checking whether its minimum value
|
|
* is at least 0.
|
|
*
|
|
* Assumes @range is valid. Does not work for subdevices using a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is unipolar.
|
|
* %false if the range is bipolar.
|
|
*/
|
|
static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
|
|
unsigned int range)
|
|
{
|
|
return s->range_table->range[range].min >= 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_range_is_external() - Test if subdevice range is external
|
|
* @s: COMEDI subdevice.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is externally reference by checking whether its
|
|
* %RF_EXTERNAL flag is set.
|
|
*
|
|
* Assumes @range is valid. Does not work for subdevices using a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is external.
|
|
* %false if the range is internal.
|
|
*/
|
|
static inline bool comedi_range_is_external(struct comedi_subdevice *s,
|
|
unsigned int range)
|
|
{
|
|
return !!(s->range_table->range[range].flags & RF_EXTERNAL);
|
|
}
|
|
|
|
/**
|
|
* comedi_chan_range_is_bipolar() - Test if channel-specific range is bipolar
|
|
* @s: COMEDI subdevice.
|
|
* @chan: The channel number.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is bipolar by checking whether its minimum value
|
|
* is negative.
|
|
*
|
|
* Assumes @chan and @range are valid. Only works for subdevices with a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is bipolar.
|
|
* %false if the range is unipolar.
|
|
*/
|
|
static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
|
|
unsigned int chan,
|
|
unsigned int range)
|
|
{
|
|
return s->range_table_list[chan]->range[range].min < 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_chan_range_is_unipolar() - Test if channel-specific range is unipolar
|
|
* @s: COMEDI subdevice.
|
|
* @chan: The channel number.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is unipolar by checking whether its minimum value
|
|
* is at least 0.
|
|
*
|
|
* Assumes @chan and @range are valid. Only works for subdevices with a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is unipolar.
|
|
* %false if the range is bipolar.
|
|
*/
|
|
static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
|
|
unsigned int chan,
|
|
unsigned int range)
|
|
{
|
|
return s->range_table_list[chan]->range[range].min >= 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_chan_range_is_external() - Test if channel-specific range is external
|
|
* @s: COMEDI subdevice.
|
|
* @chan: The channel number.
|
|
* @range: Index of range within a range table.
|
|
*
|
|
* Tests whether a range is externally reference by checking whether its
|
|
* %RF_EXTERNAL flag is set.
|
|
*
|
|
* Assumes @chan and @range are valid. Only works for subdevices with a
|
|
* channel-specific range table list.
|
|
*
|
|
* Return:
|
|
* %true if the range is bipolar.
|
|
* %false if the range is unipolar.
|
|
*/
|
|
static inline bool comedi_chan_range_is_external(struct comedi_subdevice *s,
|
|
unsigned int chan,
|
|
unsigned int range)
|
|
{
|
|
return !!(s->range_table_list[chan]->range[range].flags & RF_EXTERNAL);
|
|
}
|
|
|
|
/**
|
|
* comedi_offset_munge() - Convert between offset binary and 2's complement
|
|
* @s: COMEDI subdevice.
|
|
* @val: Value to be converted.
|
|
*
|
|
* Toggles the highest bit of a sample value to toggle between offset binary
|
|
* and 2's complement. Assumes that @s->maxdata is a power of 2 minus 1.
|
|
*
|
|
* Return: The converted value.
|
|
*/
|
|
static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
|
|
unsigned int val)
|
|
{
|
|
return val ^ s->maxdata ^ (s->maxdata >> 1);
|
|
}
|
|
|
|
/**
|
|
* comedi_bytes_per_sample() - Determine subdevice sample size
|
|
* @s: COMEDI subdevice.
|
|
*
|
|
* The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
|
|
* whether the %SDF_LSAMPL subdevice flag is set or not.
|
|
*
|
|
* Return: The subdevice sample size.
|
|
*/
|
|
static inline unsigned int comedi_bytes_per_sample(struct comedi_subdevice *s)
|
|
{
|
|
return s->subdev_flags & SDF_LSAMPL ? sizeof(int) : sizeof(short);
|
|
}
|
|
|
|
/**
|
|
* comedi_sample_shift() - Determine log2 of subdevice sample size
|
|
* @s: COMEDI subdevice.
|
|
*
|
|
* The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
|
|
* whether the %SDF_LSAMPL subdevice flag is set or not. The log2 of the
|
|
* sample size will be 2 or 1 and can be used as the right operand of a
|
|
* bit-shift operator to multiply or divide something by the sample size.
|
|
*
|
|
* Return: log2 of the subdevice sample size.
|
|
*/
|
|
static inline unsigned int comedi_sample_shift(struct comedi_subdevice *s)
|
|
{
|
|
return s->subdev_flags & SDF_LSAMPL ? 2 : 1;
|
|
}
|
|
|
|
/**
|
|
* comedi_bytes_to_samples() - Convert a number of bytes to a number of samples
|
|
* @s: COMEDI subdevice.
|
|
* @nbytes: Number of bytes
|
|
*
|
|
* Return: The number of bytes divided by the subdevice sample size.
|
|
*/
|
|
static inline unsigned int comedi_bytes_to_samples(struct comedi_subdevice *s,
|
|
unsigned int nbytes)
|
|
{
|
|
return nbytes >> comedi_sample_shift(s);
|
|
}
|
|
|
|
/**
|
|
* comedi_samples_to_bytes() - Convert a number of samples to a number of bytes
|
|
* @s: COMEDI subdevice.
|
|
* @nsamples: Number of samples.
|
|
*
|
|
* Return: The number of samples multiplied by the subdevice sample size.
|
|
* (Does not check for arithmetic overflow.)
|
|
*/
|
|
static inline unsigned int comedi_samples_to_bytes(struct comedi_subdevice *s,
|
|
unsigned int nsamples)
|
|
{
|
|
return nsamples << comedi_sample_shift(s);
|
|
}
|
|
|
|
/**
|
|
* comedi_check_trigger_src() - Trivially validate a comedi_cmd trigger source
|
|
* @src: Pointer to the trigger source to validate.
|
|
* @flags: Bitmask of valid %TRIG_* for the trigger.
|
|
*
|
|
* This is used in "step 1" of the do_cmdtest functions of comedi drivers
|
|
* to validate the comedi_cmd triggers. The mask of the @src against the
|
|
* @flags allows the userspace comedilib to pass all the comedi_cmd
|
|
* triggers as %TRIG_ANY and get back a bitmask of the valid trigger sources.
|
|
*
|
|
* Return:
|
|
* 0 if trigger sources in *@src are all supported.
|
|
* -EINVAL if any trigger source in *@src is unsupported.
|
|
*/
|
|
static inline int comedi_check_trigger_src(unsigned int *src,
|
|
unsigned int flags)
|
|
{
|
|
unsigned int orig_src = *src;
|
|
|
|
*src = orig_src & flags;
|
|
if (*src == TRIG_INVALID || *src != orig_src)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_check_trigger_is_unique() - Make sure a trigger source is unique
|
|
* @src: The trigger source to check.
|
|
*
|
|
* Return:
|
|
* 0 if no more than one trigger source is set.
|
|
* -EINVAL if more than one trigger source is set.
|
|
*/
|
|
static inline int comedi_check_trigger_is_unique(unsigned int src)
|
|
{
|
|
/* this test is true if more than one _src bit is set */
|
|
if ((src & (src - 1)) != 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_check_trigger_arg_is() - Trivially validate a trigger argument
|
|
* @arg: Pointer to the trigger arg to validate.
|
|
* @val: The value the argument should be.
|
|
*
|
|
* Forces *@arg to be @val.
|
|
*
|
|
* Return:
|
|
* 0 if *@arg was already @val.
|
|
* -EINVAL if *@arg differed from @val.
|
|
*/
|
|
static inline int comedi_check_trigger_arg_is(unsigned int *arg,
|
|
unsigned int val)
|
|
{
|
|
if (*arg != val) {
|
|
*arg = val;
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_check_trigger_arg_min() - Trivially validate a trigger argument min
|
|
* @arg: Pointer to the trigger arg to validate.
|
|
* @val: The minimum value the argument should be.
|
|
*
|
|
* Forces *@arg to be at least @val, setting it to @val if necessary.
|
|
*
|
|
* Return:
|
|
* 0 if *@arg was already at least @val.
|
|
* -EINVAL if *@arg was less than @val.
|
|
*/
|
|
static inline int comedi_check_trigger_arg_min(unsigned int *arg,
|
|
unsigned int val)
|
|
{
|
|
if (*arg < val) {
|
|
*arg = val;
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* comedi_check_trigger_arg_max() - Trivially validate a trigger argument max
|
|
* @arg: Pointer to the trigger arg to validate.
|
|
* @val: The maximum value the argument should be.
|
|
*
|
|
* Forces *@arg to be no more than @val, setting it to @val if necessary.
|
|
*
|
|
* Return:
|
|
* 0 if*@arg was already no more than @val.
|
|
* -EINVAL if *@arg was greater than @val.
|
|
*/
|
|
static inline int comedi_check_trigger_arg_max(unsigned int *arg,
|
|
unsigned int val)
|
|
{
|
|
if (*arg > val) {
|
|
*arg = val;
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
|
|
* Also useful for retrieving a previously configured hardware device of
|
|
* known bus type. Set automatically for auto-configured devices.
|
|
* Automatically set to NULL when detaching hardware device.
|
|
*/
|
|
int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);
|
|
|
|
/**
|
|
* comedi_buf_n_bytes_ready - Determine amount of unread data in buffer
|
|
* @s: COMEDI subdevice.
|
|
*
|
|
* Determines the number of bytes of unread data in the asynchronous
|
|
* acquisition data buffer for a subdevice. The data in question might not
|
|
* have been fully "munged" yet.
|
|
*
|
|
* Returns: The amount of unread data in bytes.
|
|
*/
|
|
static inline unsigned int comedi_buf_n_bytes_ready(struct comedi_subdevice *s)
|
|
{
|
|
return s->async->buf_write_count - s->async->buf_read_count;
|
|
}
|
|
|
|
unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s, unsigned int n);
|
|
unsigned int comedi_buf_write_free(struct comedi_subdevice *s, unsigned int n);
|
|
|
|
unsigned int comedi_buf_read_n_available(struct comedi_subdevice *s);
|
|
unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s, unsigned int n);
|
|
unsigned int comedi_buf_read_free(struct comedi_subdevice *s, unsigned int n);
|
|
|
|
unsigned int comedi_buf_write_samples(struct comedi_subdevice *s,
|
|
const void *data, unsigned int nsamples);
|
|
unsigned int comedi_buf_read_samples(struct comedi_subdevice *s,
|
|
void *data, unsigned int nsamples);
|
|
|
|
/* drivers.c - general comedi driver functions */
|
|
|
|
#define COMEDI_TIMEOUT_MS 1000
|
|
|
|
int comedi_timeout(struct comedi_device *dev, struct comedi_subdevice *s,
|
|
struct comedi_insn *insn,
|
|
int (*cb)(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned long context),
|
|
unsigned long context);
|
|
|
|
unsigned int comedi_handle_events(struct comedi_device *dev,
|
|
struct comedi_subdevice *s);
|
|
|
|
int comedi_dio_insn_config(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned int *data,
|
|
unsigned int mask);
|
|
unsigned int comedi_dio_update_state(struct comedi_subdevice *s,
|
|
unsigned int *data);
|
|
unsigned int comedi_bytes_per_scan_cmd(struct comedi_subdevice *s,
|
|
struct comedi_cmd *cmd);
|
|
unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s);
|
|
unsigned int comedi_nscans_left(struct comedi_subdevice *s,
|
|
unsigned int nscans);
|
|
unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
|
|
unsigned int nsamples);
|
|
void comedi_inc_scan_progress(struct comedi_subdevice *s,
|
|
unsigned int num_bytes);
|
|
|
|
void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size);
|
|
int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices);
|
|
int comedi_alloc_subdev_readback(struct comedi_subdevice *s);
|
|
|
|
int comedi_readback_insn_read(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned int *data);
|
|
|
|
int comedi_load_firmware(struct comedi_device *dev, struct device *hw_dev,
|
|
const char *name,
|
|
int (*cb)(struct comedi_device *dev,
|
|
const u8 *data, size_t size,
|
|
unsigned long context),
|
|
unsigned long context);
|
|
|
|
int __comedi_request_region(struct comedi_device *dev,
|
|
unsigned long start, unsigned long len);
|
|
int comedi_request_region(struct comedi_device *dev,
|
|
unsigned long start, unsigned long len);
|
|
void comedi_legacy_detach(struct comedi_device *dev);
|
|
|
|
int comedi_auto_config(struct device *hardware_device,
|
|
struct comedi_driver *driver, unsigned long context);
|
|
void comedi_auto_unconfig(struct device *hardware_device);
|
|
|
|
int comedi_driver_register(struct comedi_driver *driver);
|
|
void comedi_driver_unregister(struct comedi_driver *driver);
|
|
|
|
/**
|
|
* 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)
|
|
|
|
#endif /* _COMEDIDEV_H */
|