1107 lines
29 KiB
C
1107 lines
29 KiB
C
/*
|
|
module/drivers.c
|
|
functions for manipulating drivers
|
|
|
|
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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#define __NO_VERSION__
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kconfig.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/highmem.h> /* for SuSE brokenness */
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/cdev.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "comedidev.h"
|
|
#include "comedi_internal.h"
|
|
|
|
static int postconfig(struct comedi_device *dev);
|
|
static int insn_rw_emulate_bits(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned int *data);
|
|
static void *comedi_recognize(struct comedi_driver *driv, const char *name);
|
|
static void comedi_report_boards(struct comedi_driver *driv);
|
|
static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s);
|
|
|
|
struct comedi_driver *comedi_drivers;
|
|
|
|
int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int i;
|
|
|
|
if (num_subdevices < 1)
|
|
return -EINVAL;
|
|
|
|
s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
dev->subdevices = s;
|
|
dev->n_subdevices = num_subdevices;
|
|
|
|
for (i = 0; i < num_subdevices; ++i) {
|
|
s = &dev->subdevices[i];
|
|
s->device = dev;
|
|
s->async_dma_dir = DMA_NONE;
|
|
spin_lock_init(&s->spin_lock);
|
|
s->minor = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_alloc_subdevices);
|
|
|
|
static void cleanup_device(struct comedi_device *dev)
|
|
{
|
|
int i;
|
|
struct comedi_subdevice *s;
|
|
|
|
if (dev->subdevices) {
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
comedi_free_subdevice_minor(s);
|
|
if (s->async) {
|
|
comedi_buf_alloc(dev, s, 0);
|
|
kfree(s->async);
|
|
}
|
|
}
|
|
kfree(dev->subdevices);
|
|
dev->subdevices = NULL;
|
|
dev->n_subdevices = 0;
|
|
}
|
|
kfree(dev->private);
|
|
dev->private = NULL;
|
|
dev->driver = NULL;
|
|
dev->board_name = NULL;
|
|
dev->board_ptr = NULL;
|
|
dev->iobase = 0;
|
|
dev->irq = 0;
|
|
dev->read_subdev = NULL;
|
|
dev->write_subdev = NULL;
|
|
dev->open = NULL;
|
|
dev->close = NULL;
|
|
comedi_set_hw_dev(dev, NULL);
|
|
}
|
|
|
|
static void __comedi_device_detach(struct comedi_device *dev)
|
|
{
|
|
dev->attached = 0;
|
|
if (dev->driver)
|
|
dev->driver->detach(dev);
|
|
else
|
|
dev_warn(dev->class_dev,
|
|
"BUG: dev->driver=NULL in comedi_device_detach()\n");
|
|
cleanup_device(dev);
|
|
}
|
|
|
|
void comedi_device_detach(struct comedi_device *dev)
|
|
{
|
|
if (!dev->attached)
|
|
return;
|
|
__comedi_device_detach(dev);
|
|
}
|
|
|
|
/* do a little post-config cleanup */
|
|
/* called with module refcount incremented, decrements it */
|
|
static int comedi_device_postconfig(struct comedi_device *dev)
|
|
{
|
|
int ret = postconfig(dev);
|
|
module_put(dev->driver->module);
|
|
if (ret < 0) {
|
|
__comedi_device_detach(dev);
|
|
return ret;
|
|
}
|
|
if (!dev->board_name) {
|
|
dev_warn(dev->class_dev, "BUG: dev->board_name=NULL\n");
|
|
dev->board_name = "BUG";
|
|
}
|
|
smp_wmb();
|
|
dev->attached = 1;
|
|
return 0;
|
|
}
|
|
|
|
int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
|
|
{
|
|
struct comedi_driver *driv;
|
|
int ret;
|
|
|
|
if (dev->attached)
|
|
return -EBUSY;
|
|
|
|
for (driv = comedi_drivers; driv; driv = driv->next) {
|
|
if (!try_module_get(driv->module))
|
|
continue;
|
|
if (driv->num_names) {
|
|
dev->board_ptr = comedi_recognize(driv, it->board_name);
|
|
if (dev->board_ptr)
|
|
break;
|
|
} else if (strcmp(driv->driver_name, it->board_name) == 0)
|
|
break;
|
|
module_put(driv->module);
|
|
}
|
|
if (driv == NULL) {
|
|
/* recognize has failed if we get here */
|
|
/* report valid board names before returning error */
|
|
for (driv = comedi_drivers; driv; driv = driv->next) {
|
|
if (!try_module_get(driv->module))
|
|
continue;
|
|
comedi_report_boards(driv);
|
|
module_put(driv->module);
|
|
}
|
|
return -EIO;
|
|
}
|
|
if (driv->attach == NULL) {
|
|
/* driver does not support manual configuration */
|
|
dev_warn(dev->class_dev,
|
|
"driver '%s' does not support attach using comedi_config\n",
|
|
driv->driver_name);
|
|
module_put(driv->module);
|
|
return -ENOSYS;
|
|
}
|
|
/* initialize dev->driver here so
|
|
* comedi_error() can be called from attach */
|
|
dev->driver = driv;
|
|
ret = driv->attach(dev, it);
|
|
if (ret < 0) {
|
|
module_put(dev->driver->module);
|
|
__comedi_device_detach(dev);
|
|
return ret;
|
|
}
|
|
return comedi_device_postconfig(dev);
|
|
}
|
|
|
|
int comedi_driver_register(struct comedi_driver *driver)
|
|
{
|
|
driver->next = comedi_drivers;
|
|
comedi_drivers = driver;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(comedi_driver_register);
|
|
|
|
int comedi_driver_unregister(struct comedi_driver *driver)
|
|
{
|
|
struct comedi_driver *prev;
|
|
int i;
|
|
|
|
/* check for devices using this driver */
|
|
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(i);
|
|
struct comedi_device *dev;
|
|
|
|
if (dev_file_info == NULL)
|
|
continue;
|
|
dev = dev_file_info->device;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
if (dev->attached && dev->driver == driver) {
|
|
if (dev->use_count)
|
|
dev_warn(dev->class_dev,
|
|
"BUG! detaching device with use_count=%d\n",
|
|
dev->use_count);
|
|
comedi_device_detach(dev);
|
|
}
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
if (comedi_drivers == driver) {
|
|
comedi_drivers = driver->next;
|
|
return 0;
|
|
}
|
|
|
|
for (prev = comedi_drivers; prev->next; prev = prev->next) {
|
|
if (prev->next == driver) {
|
|
prev->next = driver->next;
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(comedi_driver_unregister);
|
|
|
|
static int postconfig(struct comedi_device *dev)
|
|
{
|
|
int i;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async = NULL;
|
|
int ret;
|
|
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = &dev->subdevices[i];
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED)
|
|
continue;
|
|
|
|
if (s->len_chanlist == 0)
|
|
s->len_chanlist = 1;
|
|
|
|
if (s->do_cmd) {
|
|
unsigned int buf_size;
|
|
|
|
BUG_ON((s->subdev_flags & (SDF_CMD_READ |
|
|
SDF_CMD_WRITE)) == 0);
|
|
BUG_ON(!s->do_cmdtest);
|
|
|
|
async =
|
|
kzalloc(sizeof(struct comedi_async), GFP_KERNEL);
|
|
if (async == NULL) {
|
|
dev_warn(dev->class_dev,
|
|
"failed to allocate async struct\n");
|
|
return -ENOMEM;
|
|
}
|
|
init_waitqueue_head(&async->wait_head);
|
|
async->subdevice = s;
|
|
s->async = async;
|
|
|
|
async->max_bufsize =
|
|
comedi_default_buf_maxsize_kb * 1024;
|
|
buf_size = comedi_default_buf_size_kb * 1024;
|
|
if (buf_size > async->max_bufsize)
|
|
buf_size = async->max_bufsize;
|
|
|
|
async->prealloc_buf = NULL;
|
|
async->prealloc_bufsz = 0;
|
|
if (comedi_buf_alloc(dev, s, buf_size) < 0) {
|
|
dev_warn(dev->class_dev,
|
|
"Buffer allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (s->buf_change) {
|
|
ret = s->buf_change(dev, s, buf_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
comedi_alloc_subdevice_minor(dev, s);
|
|
}
|
|
|
|
if (!s->range_table && !s->range_table_list)
|
|
s->range_table = &range_unknown;
|
|
|
|
if (!s->insn_read && s->insn_bits)
|
|
s->insn_read = insn_rw_emulate_bits;
|
|
if (!s->insn_write && s->insn_bits)
|
|
s->insn_write = insn_rw_emulate_bits;
|
|
|
|
if (!s->insn_read)
|
|
s->insn_read = insn_inval;
|
|
if (!s->insn_write)
|
|
s->insn_write = insn_inval;
|
|
if (!s->insn_bits)
|
|
s->insn_bits = insn_inval;
|
|
if (!s->insn_config)
|
|
s->insn_config = insn_inval;
|
|
|
|
if (!s->poll)
|
|
s->poll = poll_invalid;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generic recognize function for drivers that register their supported
|
|
* board names.
|
|
*
|
|
* 'driv->board_name' points to a 'const char *' member within the
|
|
* zeroth element of an array of some private board information
|
|
* structure, say 'struct foo_board' containing a member 'const char
|
|
* *board_name' that is initialized to point to a board name string that
|
|
* is one of the candidates matched against this function's 'name'
|
|
* parameter.
|
|
*
|
|
* 'driv->offset' is the size of the private board information
|
|
* structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is
|
|
* the length of the array of private board information structures.
|
|
*
|
|
* If one of the board names in the array of private board information
|
|
* structures matches the name supplied to this function, the function
|
|
* returns a pointer to the pointer to the board name, otherwise it
|
|
* returns NULL. The return value ends up in the 'board_ptr' member of
|
|
* a 'struct comedi_device' that the low-level comedi driver's
|
|
* 'attach()' hook can convert to a point to a particular element of its
|
|
* array of private board information structures by subtracting the
|
|
* offset of the member that points to the board name. (No subtraction
|
|
* is required if the board name pointer is the first member of the
|
|
* private board information structure, which is generally the case.)
|
|
*/
|
|
static void *comedi_recognize(struct comedi_driver *driv, const char *name)
|
|
{
|
|
char **name_ptr = (char **)driv->board_name;
|
|
int i;
|
|
|
|
for (i = 0; i < driv->num_names; i++) {
|
|
if (strcmp(*name_ptr, name) == 0)
|
|
return name_ptr;
|
|
name_ptr = (void *)name_ptr + driv->offset;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void comedi_report_boards(struct comedi_driver *driv)
|
|
{
|
|
unsigned int i;
|
|
const char *const *name_ptr;
|
|
|
|
pr_info("comedi: valid board names for %s driver are:\n",
|
|
driv->driver_name);
|
|
|
|
name_ptr = driv->board_name;
|
|
for (i = 0; i < driv->num_names; i++) {
|
|
pr_info(" %s\n", *name_ptr);
|
|
name_ptr = (const char **)((char *)name_ptr + driv->offset);
|
|
}
|
|
|
|
if (driv->num_names == 0)
|
|
pr_info(" %s\n", driv->driver_name);
|
|
}
|
|
|
|
static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned int *data)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int insn_rw_emulate_bits(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_insn *insn, unsigned int *data)
|
|
{
|
|
struct comedi_insn new_insn;
|
|
int ret;
|
|
static const unsigned channels_per_bitfield = 32;
|
|
|
|
unsigned chan = CR_CHAN(insn->chanspec);
|
|
const unsigned base_bitfield_channel =
|
|
(chan < channels_per_bitfield) ? 0 : chan;
|
|
unsigned int new_data[2];
|
|
memset(new_data, 0, sizeof(new_data));
|
|
memset(&new_insn, 0, sizeof(new_insn));
|
|
new_insn.insn = INSN_BITS;
|
|
new_insn.chanspec = base_bitfield_channel;
|
|
new_insn.n = 2;
|
|
new_insn.subdev = insn->subdev;
|
|
|
|
if (insn->insn == INSN_WRITE) {
|
|
if (!(s->subdev_flags & SDF_WRITABLE))
|
|
return -EINVAL;
|
|
new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */
|
|
new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel))
|
|
: 0; /* bits */
|
|
}
|
|
|
|
ret = s->insn_bits(dev, s, &new_insn, new_data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (insn->insn == INSN_READ)
|
|
data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
|
|
unsigned long new_size)
|
|
{
|
|
struct comedi_async *async = s->async;
|
|
|
|
/* Round up new_size to multiple of PAGE_SIZE */
|
|
new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
|
|
|
|
/* if no change is required, do nothing */
|
|
if (async->prealloc_buf && async->prealloc_bufsz == new_size)
|
|
return 0;
|
|
|
|
/* deallocate old buffer */
|
|
if (async->prealloc_buf) {
|
|
vunmap(async->prealloc_buf);
|
|
async->prealloc_buf = NULL;
|
|
async->prealloc_bufsz = 0;
|
|
}
|
|
if (async->buf_page_list) {
|
|
unsigned i;
|
|
for (i = 0; i < async->n_buf_pages; ++i) {
|
|
if (async->buf_page_list[i].virt_addr) {
|
|
clear_bit(PG_reserved,
|
|
&(virt_to_page(async->buf_page_list[i].
|
|
virt_addr)->flags));
|
|
if (s->async_dma_dir != DMA_NONE) {
|
|
dma_free_coherent(dev->hw_dev,
|
|
PAGE_SIZE,
|
|
async->
|
|
buf_page_list
|
|
[i].virt_addr,
|
|
async->
|
|
buf_page_list
|
|
[i].dma_addr);
|
|
} else {
|
|
free_page((unsigned long)
|
|
async->buf_page_list[i].
|
|
virt_addr);
|
|
}
|
|
}
|
|
}
|
|
vfree(async->buf_page_list);
|
|
async->buf_page_list = NULL;
|
|
async->n_buf_pages = 0;
|
|
}
|
|
/* allocate new buffer */
|
|
if (new_size) {
|
|
unsigned i = 0;
|
|
unsigned n_pages = new_size >> PAGE_SHIFT;
|
|
struct page **pages = NULL;
|
|
|
|
async->buf_page_list =
|
|
vzalloc(sizeof(struct comedi_buf_page) * n_pages);
|
|
if (async->buf_page_list)
|
|
pages = vmalloc(sizeof(struct page *) * n_pages);
|
|
|
|
if (pages) {
|
|
for (i = 0; i < n_pages; i++) {
|
|
if (s->async_dma_dir != DMA_NONE) {
|
|
async->buf_page_list[i].virt_addr =
|
|
dma_alloc_coherent(dev->hw_dev,
|
|
PAGE_SIZE,
|
|
&async->
|
|
buf_page_list
|
|
[i].dma_addr,
|
|
GFP_KERNEL |
|
|
__GFP_COMP);
|
|
} else {
|
|
async->buf_page_list[i].virt_addr =
|
|
(void *)
|
|
get_zeroed_page(GFP_KERNEL);
|
|
}
|
|
if (async->buf_page_list[i].virt_addr == NULL)
|
|
break;
|
|
|
|
set_bit(PG_reserved,
|
|
&(virt_to_page(async->buf_page_list[i].
|
|
virt_addr)->flags));
|
|
pages[i] = virt_to_page(async->buf_page_list[i].
|
|
virt_addr);
|
|
}
|
|
}
|
|
if (i == n_pages) {
|
|
async->prealloc_buf =
|
|
#ifdef PAGE_KERNEL_NOCACHE
|
|
vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE);
|
|
#else
|
|
vmap(pages, n_pages, VM_MAP, PAGE_KERNEL);
|
|
#endif
|
|
}
|
|
vfree(pages);
|
|
|
|
if (async->prealloc_buf == NULL) {
|
|
/* Some allocation failed above. */
|
|
if (async->buf_page_list) {
|
|
for (i = 0; i < n_pages; i++) {
|
|
if (async->buf_page_list[i].virt_addr ==
|
|
NULL) {
|
|
break;
|
|
}
|
|
clear_bit(PG_reserved,
|
|
&(virt_to_page(async->
|
|
buf_page_list[i].
|
|
virt_addr)->flags));
|
|
if (s->async_dma_dir != DMA_NONE) {
|
|
dma_free_coherent(dev->hw_dev,
|
|
PAGE_SIZE,
|
|
async->
|
|
buf_page_list
|
|
[i].virt_addr,
|
|
async->
|
|
buf_page_list
|
|
[i].dma_addr);
|
|
} else {
|
|
free_page((unsigned long)
|
|
async->buf_page_list
|
|
[i].virt_addr);
|
|
}
|
|
}
|
|
vfree(async->buf_page_list);
|
|
async->buf_page_list = NULL;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
async->n_buf_pages = n_pages;
|
|
}
|
|
async->prealloc_bufsz = new_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* munging is applied to data by core as it passes between user
|
|
* and kernel space */
|
|
static unsigned int comedi_buf_munge(struct comedi_async *async,
|
|
unsigned int num_bytes)
|
|
{
|
|
struct comedi_subdevice *s = async->subdevice;
|
|
unsigned int count = 0;
|
|
const unsigned num_sample_bytes = bytes_per_sample(s);
|
|
|
|
if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) {
|
|
async->munge_count += num_bytes;
|
|
BUG_ON((int)(async->munge_count - async->buf_write_count) > 0);
|
|
return num_bytes;
|
|
}
|
|
/* don't munge partial samples */
|
|
num_bytes -= num_bytes % num_sample_bytes;
|
|
while (count < num_bytes) {
|
|
int block_size;
|
|
|
|
block_size = num_bytes - count;
|
|
if (block_size < 0) {
|
|
dev_warn(s->device->class_dev,
|
|
"%s: %s: bug! block_size is negative\n",
|
|
__FILE__, __func__);
|
|
break;
|
|
}
|
|
if ((int)(async->munge_ptr + block_size -
|
|
async->prealloc_bufsz) > 0)
|
|
block_size = async->prealloc_bufsz - async->munge_ptr;
|
|
|
|
s->munge(s->device, s, async->prealloc_buf + async->munge_ptr,
|
|
block_size, async->munge_chan);
|
|
|
|
smp_wmb(); /* barrier insures data is munged in buffer
|
|
* before munge_count is incremented */
|
|
|
|
async->munge_chan += block_size / num_sample_bytes;
|
|
async->munge_chan %= async->cmd.chanlist_len;
|
|
async->munge_count += block_size;
|
|
async->munge_ptr += block_size;
|
|
async->munge_ptr %= async->prealloc_bufsz;
|
|
count += block_size;
|
|
}
|
|
BUG_ON((int)(async->munge_count - async->buf_write_count) > 0);
|
|
return count;
|
|
}
|
|
|
|
unsigned int comedi_buf_write_n_available(struct comedi_async *async)
|
|
{
|
|
unsigned int free_end;
|
|
unsigned int nbytes;
|
|
|
|
if (async == NULL)
|
|
return 0;
|
|
|
|
free_end = async->buf_read_count + async->prealloc_bufsz;
|
|
nbytes = free_end - async->buf_write_alloc_count;
|
|
nbytes -= nbytes % bytes_per_sample(async->subdevice);
|
|
/* barrier insures the read of buf_read_count in this
|
|
query occurs before any following writes to the buffer which
|
|
might be based on the return value from this query.
|
|
*/
|
|
smp_mb();
|
|
return nbytes;
|
|
}
|
|
|
|
/* allocates chunk for the writer from free buffer space */
|
|
unsigned int comedi_buf_write_alloc(struct comedi_async *async,
|
|
unsigned int nbytes)
|
|
{
|
|
unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
|
|
|
|
if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0)
|
|
nbytes = free_end - async->buf_write_alloc_count;
|
|
|
|
async->buf_write_alloc_count += nbytes;
|
|
/* barrier insures the read of buf_read_count above occurs before
|
|
we write data to the write-alloc'ed buffer space */
|
|
smp_mb();
|
|
return nbytes;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_write_alloc);
|
|
|
|
/* allocates nothing unless it can completely fulfill the request */
|
|
unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async,
|
|
unsigned int nbytes)
|
|
{
|
|
unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
|
|
|
|
if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0)
|
|
nbytes = 0;
|
|
|
|
async->buf_write_alloc_count += nbytes;
|
|
/* barrier insures the read of buf_read_count above occurs before
|
|
we write data to the write-alloc'ed buffer space */
|
|
smp_mb();
|
|
return nbytes;
|
|
}
|
|
|
|
/* transfers a chunk from writer to filled buffer space */
|
|
unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes)
|
|
{
|
|
if ((int)(async->buf_write_count + nbytes -
|
|
async->buf_write_alloc_count) > 0) {
|
|
dev_info(async->subdevice->device->class_dev,
|
|
"attempted to write-free more bytes than have been write-allocated.\n");
|
|
nbytes = async->buf_write_alloc_count - async->buf_write_count;
|
|
}
|
|
async->buf_write_count += nbytes;
|
|
async->buf_write_ptr += nbytes;
|
|
comedi_buf_munge(async, async->buf_write_count - async->munge_count);
|
|
if (async->buf_write_ptr >= async->prealloc_bufsz)
|
|
async->buf_write_ptr %= async->prealloc_bufsz;
|
|
|
|
return nbytes;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_write_free);
|
|
|
|
/* allocates a chunk for the reader from filled (and munged) buffer space */
|
|
unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes)
|
|
{
|
|
if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) >
|
|
0) {
|
|
nbytes = async->munge_count - async->buf_read_alloc_count;
|
|
}
|
|
async->buf_read_alloc_count += nbytes;
|
|
/* barrier insures read of munge_count occurs before we actually read
|
|
data out of buffer */
|
|
smp_rmb();
|
|
return nbytes;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_read_alloc);
|
|
|
|
/* transfers control of a chunk from reader to free buffer space */
|
|
unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes)
|
|
{
|
|
/* barrier insures data has been read out of
|
|
* buffer before read count is incremented */
|
|
smp_mb();
|
|
if ((int)(async->buf_read_count + nbytes -
|
|
async->buf_read_alloc_count) > 0) {
|
|
dev_info(async->subdevice->device->class_dev,
|
|
"attempted to read-free more bytes than have been read-allocated.\n");
|
|
nbytes = async->buf_read_alloc_count - async->buf_read_count;
|
|
}
|
|
async->buf_read_count += nbytes;
|
|
async->buf_read_ptr += nbytes;
|
|
async->buf_read_ptr %= async->prealloc_bufsz;
|
|
return nbytes;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_read_free);
|
|
|
|
void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
|
|
const void *data, unsigned int num_bytes)
|
|
{
|
|
unsigned int write_ptr = async->buf_write_ptr + offset;
|
|
|
|
if (write_ptr >= async->prealloc_bufsz)
|
|
write_ptr %= async->prealloc_bufsz;
|
|
|
|
while (num_bytes) {
|
|
unsigned int block_size;
|
|
|
|
if (write_ptr + num_bytes > async->prealloc_bufsz)
|
|
block_size = async->prealloc_bufsz - write_ptr;
|
|
else
|
|
block_size = num_bytes;
|
|
|
|
memcpy(async->prealloc_buf + write_ptr, data, block_size);
|
|
|
|
data += block_size;
|
|
num_bytes -= block_size;
|
|
|
|
write_ptr = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_memcpy_to);
|
|
|
|
void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
|
|
void *dest, unsigned int nbytes)
|
|
{
|
|
void *src;
|
|
unsigned int read_ptr = async->buf_read_ptr + offset;
|
|
|
|
if (read_ptr >= async->prealloc_bufsz)
|
|
read_ptr %= async->prealloc_bufsz;
|
|
|
|
while (nbytes) {
|
|
unsigned int block_size;
|
|
|
|
src = async->prealloc_buf + read_ptr;
|
|
|
|
if (nbytes >= async->prealloc_bufsz - read_ptr)
|
|
block_size = async->prealloc_bufsz - read_ptr;
|
|
else
|
|
block_size = nbytes;
|
|
|
|
memcpy(dest, src, block_size);
|
|
nbytes -= block_size;
|
|
dest += block_size;
|
|
read_ptr = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_memcpy_from);
|
|
|
|
unsigned int comedi_buf_read_n_available(struct comedi_async *async)
|
|
{
|
|
unsigned num_bytes;
|
|
|
|
if (async == NULL)
|
|
return 0;
|
|
num_bytes = async->munge_count - async->buf_read_count;
|
|
/* barrier insures the read of munge_count in this
|
|
query occurs before any following reads of the buffer which
|
|
might be based on the return value from this query.
|
|
*/
|
|
smp_rmb();
|
|
return num_bytes;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_read_n_available);
|
|
|
|
int comedi_buf_get(struct comedi_async *async, short *x)
|
|
{
|
|
unsigned int n = comedi_buf_read_n_available(async);
|
|
|
|
if (n < sizeof(short))
|
|
return 0;
|
|
comedi_buf_read_alloc(async, sizeof(short));
|
|
*x = *(short *)(async->prealloc_buf + async->buf_read_ptr);
|
|
comedi_buf_read_free(async, sizeof(short));
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_get);
|
|
|
|
int comedi_buf_put(struct comedi_async *async, short x)
|
|
{
|
|
unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short));
|
|
|
|
if (n < sizeof(short)) {
|
|
async->events |= COMEDI_CB_ERROR;
|
|
return 0;
|
|
}
|
|
*(short *)(async->prealloc_buf + async->buf_write_ptr) = x;
|
|
comedi_buf_write_free(async, sizeof(short));
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(comedi_buf_put);
|
|
|
|
void comedi_reset_async_buf(struct comedi_async *async)
|
|
{
|
|
async->buf_write_alloc_count = 0;
|
|
async->buf_write_count = 0;
|
|
async->buf_read_alloc_count = 0;
|
|
async->buf_read_count = 0;
|
|
|
|
async->buf_write_ptr = 0;
|
|
async->buf_read_ptr = 0;
|
|
|
|
async->cur_chan = 0;
|
|
async->scan_progress = 0;
|
|
async->munge_chan = 0;
|
|
async->munge_count = 0;
|
|
async->munge_ptr = 0;
|
|
|
|
async->events = 0;
|
|
}
|
|
|
|
static int
|
|
comedi_auto_config_helper(struct device *hardware_device,
|
|
struct comedi_driver *driver,
|
|
int (*attach_wrapper) (struct comedi_device *,
|
|
void *), void *context)
|
|
{
|
|
int minor;
|
|
struct comedi_device_file_info *dev_file_info;
|
|
struct comedi_device *comedi_dev;
|
|
int ret;
|
|
|
|
if (!comedi_autoconfig)
|
|
return 0;
|
|
|
|
minor = comedi_alloc_board_minor(hardware_device);
|
|
if (minor < 0)
|
|
return minor;
|
|
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
comedi_dev = dev_file_info->device;
|
|
|
|
mutex_lock(&comedi_dev->mutex);
|
|
if (comedi_dev->attached)
|
|
ret = -EBUSY;
|
|
else if (!try_module_get(driver->module))
|
|
ret = -EIO;
|
|
else {
|
|
/* set comedi_dev->driver here for attach wrapper */
|
|
comedi_dev->driver = driver;
|
|
ret = (*attach_wrapper)(comedi_dev, context);
|
|
if (ret < 0) {
|
|
module_put(driver->module);
|
|
__comedi_device_detach(comedi_dev);
|
|
} else {
|
|
ret = comedi_device_postconfig(comedi_dev);
|
|
}
|
|
}
|
|
mutex_unlock(&comedi_dev->mutex);
|
|
|
|
if (ret < 0)
|
|
comedi_free_board_minor(minor);
|
|
return ret;
|
|
}
|
|
|
|
static int comedi_auto_config_wrapper(struct comedi_device *dev, void *context)
|
|
{
|
|
struct comedi_devconfig *it = context;
|
|
struct comedi_driver *driv = dev->driver;
|
|
|
|
if (driv->num_names) {
|
|
/* look for generic board entry matching driver name, which
|
|
* has already been copied to it->board_name */
|
|
dev->board_ptr = comedi_recognize(driv, it->board_name);
|
|
if (dev->board_ptr == NULL) {
|
|
dev_warn(dev->class_dev,
|
|
"auto config failed to find board entry '%s' for driver '%s'\n",
|
|
it->board_name, driv->driver_name);
|
|
comedi_report_boards(driv);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (!driv->attach) {
|
|
dev_warn(dev->class_dev,
|
|
"BUG! driver '%s' using old-style auto config but has no attach handler\n",
|
|
driv->driver_name);
|
|
return -EINVAL;
|
|
}
|
|
return driv->attach(dev, it);
|
|
}
|
|
|
|
static int comedi_auto_config(struct device *hardware_device,
|
|
struct comedi_driver *driver, const int *options,
|
|
unsigned num_options)
|
|
{
|
|
struct comedi_devconfig it;
|
|
|
|
memset(&it, 0, sizeof(it));
|
|
strncpy(it.board_name, driver->driver_name, COMEDI_NAMELEN);
|
|
it.board_name[COMEDI_NAMELEN - 1] = '\0';
|
|
BUG_ON(num_options > COMEDI_NDEVCONFOPTS);
|
|
memcpy(it.options, options, num_options * sizeof(int));
|
|
return comedi_auto_config_helper(hardware_device, driver,
|
|
comedi_auto_config_wrapper, &it);
|
|
}
|
|
|
|
static void comedi_auto_unconfig(struct device *hardware_device)
|
|
{
|
|
int minor;
|
|
|
|
if (hardware_device == NULL)
|
|
return;
|
|
minor = comedi_find_board_minor(hardware_device);
|
|
if (minor < 0)
|
|
return;
|
|
BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
|
|
comedi_free_board_minor(minor);
|
|
}
|
|
|
|
/**
|
|
* comedi_pci_enable() - Enable the PCI device and request the regions.
|
|
* @pdev: pci_dev struct
|
|
* @res_name: name for the requested reqource
|
|
*/
|
|
int comedi_pci_enable(struct pci_dev *pdev, const char *res_name)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_enable_device(pdev);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = pci_request_regions(pdev, res_name);
|
|
if (rc < 0)
|
|
pci_disable_device(pdev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_enable);
|
|
|
|
/**
|
|
* comedi_pci_disable() - Release the regions and disable the PCI device.
|
|
* @pdev: pci_dev struct
|
|
*
|
|
* This must be matched with a previous successful call to comedi_pci_enable().
|
|
*/
|
|
void comedi_pci_disable(struct pci_dev *pdev)
|
|
{
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_disable);
|
|
|
|
static int comedi_old_pci_auto_config(struct pci_dev *pcidev,
|
|
struct comedi_driver *driver)
|
|
{
|
|
int options[2];
|
|
|
|
/* pci bus */
|
|
options[0] = pcidev->bus->number;
|
|
/* pci slot */
|
|
options[1] = PCI_SLOT(pcidev->devfn);
|
|
|
|
return comedi_auto_config(&pcidev->dev, driver,
|
|
options, ARRAY_SIZE(options));
|
|
}
|
|
|
|
static int comedi_pci_attach_wrapper(struct comedi_device *dev, void *pcidev)
|
|
{
|
|
return dev->driver->attach_pci(dev, pcidev);
|
|
}
|
|
|
|
static int comedi_new_pci_auto_config(struct pci_dev *pcidev,
|
|
struct comedi_driver *driver)
|
|
{
|
|
return comedi_auto_config_helper(&pcidev->dev, driver,
|
|
comedi_pci_attach_wrapper, pcidev);
|
|
}
|
|
|
|
int comedi_pci_auto_config(struct pci_dev *pcidev, struct comedi_driver *driver)
|
|
{
|
|
|
|
if (driver->attach_pci)
|
|
return comedi_new_pci_auto_config(pcidev, driver);
|
|
else
|
|
return comedi_old_pci_auto_config(pcidev, driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
|
|
|
|
void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
|
|
{
|
|
comedi_auto_unconfig(&pcidev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
|
|
|
|
int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
|
|
struct pci_driver *pci_driver)
|
|
{
|
|
int ret;
|
|
|
|
ret = comedi_driver_register(comedi_driver);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* FIXME: Remove this test after auditing all comedi pci drivers */
|
|
if (!pci_driver->name)
|
|
pci_driver->name = comedi_driver->driver_name;
|
|
|
|
ret = pci_register_driver(pci_driver);
|
|
if (ret < 0) {
|
|
comedi_driver_unregister(comedi_driver);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
|
|
|
|
void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
|
|
struct pci_driver *pci_driver)
|
|
{
|
|
pci_unregister_driver(pci_driver);
|
|
comedi_driver_unregister(comedi_driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
|
|
|
|
#if IS_ENABLED(CONFIG_USB)
|
|
|
|
static int comedi_old_usb_auto_config(struct usb_interface *intf,
|
|
struct comedi_driver *driver)
|
|
{
|
|
return comedi_auto_config(&intf->dev, driver, NULL, 0);
|
|
}
|
|
|
|
static int comedi_usb_attach_wrapper(struct comedi_device *dev, void *intf)
|
|
{
|
|
return dev->driver->attach_usb(dev, intf);
|
|
}
|
|
|
|
static int comedi_new_usb_auto_config(struct usb_interface *intf,
|
|
struct comedi_driver *driver)
|
|
{
|
|
return comedi_auto_config_helper(&intf->dev, driver,
|
|
comedi_usb_attach_wrapper, intf);
|
|
}
|
|
|
|
int comedi_usb_auto_config(struct usb_interface *intf,
|
|
struct comedi_driver *driver)
|
|
{
|
|
BUG_ON(intf == NULL);
|
|
if (driver->attach_usb)
|
|
return comedi_new_usb_auto_config(intf, driver);
|
|
else
|
|
return comedi_old_usb_auto_config(intf, driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_usb_auto_config);
|
|
|
|
void comedi_usb_auto_unconfig(struct usb_interface *intf)
|
|
{
|
|
BUG_ON(intf == NULL);
|
|
comedi_auto_unconfig(&intf->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig);
|
|
|
|
int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
|
|
struct usb_driver *usb_driver)
|
|
{
|
|
int ret;
|
|
|
|
ret = comedi_driver_register(comedi_driver);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = usb_register(usb_driver);
|
|
if (ret < 0) {
|
|
comedi_driver_unregister(comedi_driver);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_usb_driver_register);
|
|
|
|
void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
|
|
struct usb_driver *usb_driver)
|
|
{
|
|
usb_deregister(usb_driver);
|
|
comedi_driver_unregister(comedi_driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
|
|
|
|
#endif
|