/*
include/linux/comedidev.h
header file for kernel-only structures, variables, and constants
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#ifndef _COMEDIDEV_H
#define _COMEDIDEV_H
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/spinlock_types.h>
#include <linux/rwsem.h>
#include <linux/kref.h>
#include "comedi.h"
#define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
#define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
COMEDI_MINORVERSION, COMEDI_MICROVERSION)
#define COMEDI_RELEASE VERSION
#define COMEDI_NUM_BOARD_MINORS 0x30
struct comedi_subdevice {
struct comedi_device *device;
int index;
int type;
int n_chan;
int subdev_flags;
int len_chanlist; /* maximum length of channel/gain list */
void *private;
struct comedi_async *async;
void *lock;
void *busy;
unsigned runflags;
spinlock_t spin_lock;
unsigned int io_bits;
unsigned int maxdata; /* if maxdata==0, use list */
const unsigned int *maxdata_list; /* list is channel specific */
const struct comedi_lrange *range_table;
const struct comedi_lrange *const *range_table_list;
unsigned int *chanlist; /* driver-owned chanlist (not used) */
int (*insn_read)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*insn_write)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*insn_bits)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*insn_config)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*do_cmd)(struct comedi_device *, struct comedi_subdevice *);
int (*do_cmdtest)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_cmd *);
int (*poll)(struct comedi_device *, struct comedi_subdevice *);
int (*cancel)(struct comedi_device *, struct comedi_subdevice *);
/* called when the buffer changes */
int (*buf_change)(struct comedi_device *, struct comedi_subdevice *);
void (*munge)(struct comedi_device *dev, struct comedi_subdevice *s,
void *data, unsigned int num_bytes,
unsigned int start_chan_index);
enum dma_data_direction async_dma_dir;
unsigned int state;
struct device *class_dev;
int minor;
unsigned int *readback;
};
struct comedi_buf_page {
void *virt_addr;
dma_addr_t dma_addr;
};
struct comedi_buf_map {
struct device *dma_hw_dev;
struct comedi_buf_page *page_list;
unsigned int n_pages;
enum dma_data_direction dma_dir;
struct kref refcount;
};
/**
* struct comedi_async - control data for asynchronous comedi commands
* @prealloc_buf: preallocated buffer
* @prealloc_bufsz: buffer size (in bytes)
* @buf_map: map of buffer pages
* @max_bufsize: maximum buffer size (in bytes)
* @buf_write_count: "write completed" count (in bytes, modulo 2**32)
* @buf_write_alloc_count: "allocated for writing" count (in bytes,
* modulo 2**32)
* @buf_read_count: "read completed" count (in bytes, modulo 2**32)
* @buf_read_alloc_count: "allocated for reading" count (in bytes,
* modulo 2**32)
* @buf_write_ptr: buffer position for writer
* @buf_read_ptr: buffer position for reader
* @cur_chan: current position in chanlist for scan (for those
* drivers that use it)
* @scans_done: the number of scans completed (COMEDI_CB_EOS)
* @scan_progress: amount received or sent for current scan (in bytes)
* @munge_chan: current position in chanlist for "munging"
* @munge_count: "munge" count (in bytes, modulo 2**32)
* @munge_ptr: buffer position for "munging"
* @events: bit-vector of events that have occurred
* @cmd: details of comedi command in progress
* @wait_head: task wait queue for file reader or writer
* @cb_mask: bit-vector of events that should wake waiting tasks
* @inttrig: software trigger function for command, or NULL
*
* Note about the ..._count and ..._ptr members:
*
* Think of the _Count values being integers of unlimited size, indexing
* into a buffer of infinite length (though only an advancing portion
* of the buffer of fixed length prealloc_bufsz is accessible at any time).
* Then:
*
* Buf_Read_Count <= Buf_Read_Alloc_Count <= Munge_Count <=
* Buf_Write_Count <= Buf_Write_Alloc_Count <=
* (Buf_Read_Count + prealloc_bufsz)
*
* (Those aren't the actual members, apart from prealloc_bufsz.) When
* the buffer is reset, those _Count values start at 0 and only increase
* in value, maintaining the above inequalities until the next time the
* buffer is reset. The buffer is divided into the following regions by
* the inequalities:
*
* [0, Buf_Read_Count):
* old region no longer accessible
* [Buf_Read_Count, Buf_Read_Alloc_Count):
* filled and munged region allocated for reading but not yet read
* [Buf_Read_Alloc_Count, Munge_Count):
* filled and munged region not yet allocated for reading
* [Munge_Count, Buf_Write_Count):
* filled region not yet munged
* [Buf_Write_Count, Buf_Write_Alloc_Count):
* unfilled region allocated for writing but not yet written
* [Buf_Write_Alloc_Count, Buf_Read_Count + prealloc_bufsz):
* unfilled region not yet allocated for writing
* [Buf_Read_Count + prealloc_bufsz, infinity):
* unfilled region not yet accessible
*
* Data needs to be written into the buffer before it can be read out,
* and may need to be converted (or "munged") between the two
* operations. Extra unfilled buffer space may need to allocated for
* writing (advancing Buf_Write_Alloc_Count) before new data is written.
* After writing new data, the newly filled space needs to be released
* (advancing Buf_Write_Count). This also results in the new data being
* "munged" (advancing Munge_Count). Before data is read out of the
* buffer, extra space may need to be allocated for reading (advancing
* Buf_Read_Alloc_Count). After the data has been read out, the space
* needs to be released (advancing Buf_Read_Count).
*
* The actual members, buf_read_count, buf_read_alloc_count,
* munge_count, buf_write_count, and buf_write_alloc_count take the
* value of the corresponding capitalized _Count values modulo 2^32
* (UINT_MAX+1). Subtracting a "higher" _count value from a "lower"
* _count value gives the same answer as subtracting a "higher" _Count
* value from a lower _Count value because prealloc_bufsz < UINT_MAX+1.
* The modulo operation is done implicitly.
*
* The buf_read_ptr, munge_ptr, and buf_write_ptr members take the value
* of the corresponding capitalized _Count values modulo prealloc_bufsz.
* These correspond to byte indices in the physical buffer. The modulo
* operation is done by subtracting prealloc_bufsz when the value
* exceeds prealloc_bufsz (assuming prealloc_bufsz plus the increment is
* less than or equal to UINT_MAX).
*/
struct comedi_async {
void *prealloc_buf;
unsigned int prealloc_bufsz;
struct comedi_buf_map *buf_map;
unsigned int max_bufsize;
unsigned int buf_write_count;
unsigned int buf_write_alloc_count;
unsigned int buf_read_count;
unsigned int buf_read_alloc_count;
unsigned int buf_write_ptr;
unsigned int buf_read_ptr;
unsigned int cur_chan;
unsigned int scans_done;
unsigned int scan_progress;
unsigned int munge_chan;
unsigned int munge_count;
unsigned int munge_ptr;
unsigned int events;
struct comedi_cmd cmd;
wait_queue_head_t wait_head;
unsigned int cb_mask;
int (*inttrig)(struct comedi_device *dev, struct comedi_subdevice *s,
unsigned int x);
};
/**
* comedi_async callback "events"
* @COMEDI_CB_EOS: end-of-scan
* @COMEDI_CB_EOA: end-of-acquisition/output
* @COMEDI_CB_BLOCK: data has arrived, wakes up read() / write()
* @COMEDI_CB_EOBUF: DEPRECATED: end of buffer
* @COMEDI_CB_ERROR: card error during acquisition
* @COMEDI_CB_OVERFLOW: buffer overflow/underflow
*
* @COMEDI_CB_ERROR_MASK: events that indicate an error has occurred
* @COMEDI_CB_CANCEL_MASK: events that will cancel an async command
*/
#define COMEDI_CB_EOS (1 << 0)
#define COMEDI_CB_EOA (1 << 1)
#define COMEDI_CB_BLOCK (1 << 2)
#define COMEDI_CB_EOBUF (1 << 3)
#define COMEDI_CB_ERROR (1 << 4)
#define COMEDI_CB_OVERFLOW (1 << 5)
#define COMEDI_CB_ERROR_MASK (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)
#define COMEDI_CB_CANCEL_MASK (COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK)
struct comedi_driver {
struct comedi_driver *next;
const char *driver_name;
struct module *module;
int (*attach)(struct comedi_device *, struct comedi_devconfig *);
void (*detach)(struct comedi_device *);
int (*auto_attach)(struct comedi_device *, unsigned long);
/* number of elements in board_name and board_id arrays */
unsigned int num_names;
const char *const *board_name;
/* offset in bytes from one board name pointer to the next */
int offset;
};
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;
/* hw_dev is passed to dma_alloc_coherent when allocating async buffers
* for subdevices that have async_dma_dir set to something other than
* DMA_NONE */
struct device *hw_dev;
const char *board_name;
const void *board_ptr;
bool attached:1;
bool ioenabled:1;
spinlock_t spinlock;
struct mutex mutex;
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);
};
/*
* function prototypes
*/
void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
struct comedi_device *comedi_dev_get_from_minor(unsigned minor);
int comedi_dev_put(struct comedi_device *dev);
/**
* comedi_subdevice "runflags"
* @COMEDI_SRF_RT: DEPRECATED: command is running real-time
* @COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred
* since the last command was started
* @COMEDI_SRF_RUNNING: command is running
* @COMEDI_SRF_FREE_SPRIV: free s->private on detach
*
* @COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy"
*/
#define COMEDI_SRF_RT BIT(1)
#define COMEDI_SRF_ERROR BIT(2)
#define COMEDI_SRF_RUNNING BIT(27)
#define COMEDI_SRF_FREE_SPRIV BIT(31)
#define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING)
bool comedi_is_subdevice_running(struct comedi_subdevice *s);
void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
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
#if __GNUC__ >= 3
#define GCC_ZERO_LENGTH_ARRAY
#else
#define GCC_ZERO_LENGTH_ARRAY 0
#endif
struct comedi_lrange {
int length;
struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
};
static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
unsigned int range)
{
return s->range_table->range[range].min < 0;
}
static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
unsigned int range)
{
return s->range_table->range[range].min >= 0;
}
static inline bool comedi_range_is_external(struct comedi_subdevice *s,
unsigned int range)
{
return !!(s->range_table->range[range].flags & RF_EXTERNAL);
}
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;
}
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;
}
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);
}
/* munge between offset binary and two's complement values */
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 struct
*
* The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
* whether the SDF_LSAMPL subdevice flag is set or not.
*
* Returns 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 struct
*
* 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.
*
* Returns 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 - converts a number of bytes to a number of samples
* @s: comedi_subdevice struct
* @nbytes: number of bytes
*
* Returns 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 - converts a number of samples to a number of bytes
* @s: comedi_subdevice struct
* @nsamples: number of samples
*
* Returns 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 vaildate 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.
*/
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
*/
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
*/
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
* @arg: pointer to the trigger arg to validate
* @val: the minimum value the argument should be
*/
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
* @arg: pointer to the trigger arg to validate
* @val: the maximum value the argument should be
*/
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);
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 *, struct comedi_subdevice *,
struct comedi_insn *,
int (*cb)(struct comedi_device *, struct comedi_subdevice *,
struct comedi_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 *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *data,
unsigned int mask);
unsigned int comedi_dio_update_state(struct comedi_subdevice *,
unsigned int *data);
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 *, size_t);
int comedi_alloc_subdevices(struct comedi_device *, int);
int comedi_alloc_subdev_readback(struct comedi_subdevice *);
int comedi_readback_insn_read(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *data);
int comedi_load_firmware(struct comedi_device *, struct device *,
const char *name,
int (*cb)(struct comedi_device *,
const u8 *data, size_t size,
unsigned long context),
unsigned long context);
int __comedi_request_region(struct comedi_device *,
unsigned long start, unsigned long len);
int comedi_request_region(struct comedi_device *,
unsigned long start, unsigned long len);
void comedi_legacy_detach(struct comedi_device *);
int comedi_auto_config(struct device *, struct comedi_driver *,
unsigned long context);
void comedi_auto_unconfig(struct device *);
int comedi_driver_register(struct comedi_driver *);
void comedi_driver_unregister(struct comedi_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 */