blob: 317a821b7906409a5fef8edd6a40b3360945300e [file] [log] [blame]
/*
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.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fcntl.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 <linux/interrupt.h>
#include <linux/firmware.h>
#include "comedidev.h"
#include "comedi_internal.h"
struct comedi_driver *comedi_drivers;
DEFINE_MUTEX(comedi_drivers_list_lock);
int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev)
{
if (hw_dev == dev->hw_dev)
return 0;
if (dev->hw_dev != NULL)
return -EEXIST;
dev->hw_dev = get_device(hw_dev);
return 0;
}
EXPORT_SYMBOL_GPL(comedi_set_hw_dev);
static void comedi_clear_hw_dev(struct comedi_device *dev)
{
put_device(dev->hw_dev);
dev->hw_dev = NULL;
}
/**
* comedi_alloc_devpriv() - Allocate memory for the device private data.
* @dev: comedi_device struct
* @size: size of the memory to allocate
*/
void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size)
{
dev->private = kzalloc(size, GFP_KERNEL);
return dev->private;
}
EXPORT_SYMBOL_GPL(comedi_alloc_devpriv);
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->index = i;
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];
if (s->runflags & SRF_FREE_SPRIV)
kfree(s->private);
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->iolen = 0;
dev->ioenabled = false;
dev->irq = 0;
dev->read_subdev = NULL;
dev->write_subdev = NULL;
dev->open = NULL;
dev->close = NULL;
comedi_clear_hw_dev(dev);
}
void comedi_device_detach(struct comedi_device *dev)
{
dev->attached = false;
if (dev->driver)
dev->driver->detach(dev);
cleanup_device(dev);
}
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;
}
/**
* comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices.
* @dev: comedi_device struct
* @s: comedi_subdevice struct
* @insn: comedi_insn struct
* @data: parameters for the @insn
* @mask: io_bits mask for grouped channels
*/
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 chan_mask = 1 << CR_CHAN(insn->chanspec);
if (!mask)
mask = chan_mask;
switch (data[0]) {
case INSN_CONFIG_DIO_INPUT:
s->io_bits &= ~mask;
break;
case INSN_CONFIG_DIO_OUTPUT:
s->io_bits |= mask;
break;
case INSN_CONFIG_DIO_QUERY:
data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
return insn->n;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(comedi_dio_insn_config);
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;
}
static int __comedi_device_postconfig_async(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct comedi_async *async;
unsigned int buf_size;
int ret;
if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) {
dev_warn(dev->class_dev,
"async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n");
return -EINVAL;
}
if (!s->do_cmdtest) {
dev_warn(dev->class_dev,
"async subdevices must have a do_cmdtest() function\n");
return -EINVAL;
}
async = kzalloc(sizeof(*async), GFP_KERNEL);
if (!async)
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;
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(s);
return 0;
}
static int __comedi_device_postconfig(struct comedi_device *dev)
{
struct comedi_subdevice *s;
int ret;
int i;
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) {
ret = __comedi_device_postconfig_async(dev, s);
if (ret)
return ret;
}
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;
}
/* do a little post-config cleanup */
static int comedi_device_postconfig(struct comedi_device *dev)
{
int ret;
ret = __comedi_device_postconfig(dev);
if (ret < 0)
return ret;
smp_wmb();
dev->attached = true;
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);
}
/**
* comedi_load_firmware() - Request and load firmware for a device.
* @dev: comedi_device struct
* @hw_device: device struct for the comedi_device
* @name: the name of the firmware image
* @cb: callback to the upload the firmware image
* @context: private context from the driver
*/
int comedi_load_firmware(struct comedi_device *dev,
struct device *device,
const char *name,
int (*cb)(struct comedi_device *dev,
const u8 *data, size_t size,
unsigned long context),
unsigned long context)
{
const struct firmware *fw;
int ret;
if (!cb)
return -EINVAL;
ret = request_firmware(&fw, name, device);
if (ret == 0) {
ret = cb(dev, fw->data, fw->size, context);
release_firmware(fw);
}
return ret;
}
EXPORT_SYMBOL_GPL(comedi_load_firmware);
/**
* __comedi_request_region() - Request an I/O reqion for a legacy driver.
* @dev: comedi_device struct
* @start: base address of the I/O reqion
* @len: length of the I/O region
*/
int __comedi_request_region(struct comedi_device *dev,
unsigned long start, unsigned long len)
{
if (!start) {
dev_warn(dev->class_dev,
"%s: a I/O base address must be specified\n",
dev->board_name);
return -EINVAL;
}
if (!request_region(start, len, dev->board_name)) {
dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n",
dev->board_name, start, len);
return -EIO;
}
return 0;
}
EXPORT_SYMBOL_GPL(__comedi_request_region);
/**
* comedi_request_region() - Request an I/O reqion for a legacy driver.
* @dev: comedi_device struct
* @start: base address of the I/O reqion
* @len: length of the I/O region
*/
int comedi_request_region(struct comedi_device *dev,
unsigned long start, unsigned long len)
{
int ret;
ret = __comedi_request_region(dev, start, len);
if (ret == 0) {
dev->iobase = start;
dev->iolen = len;
}
return ret;
}
EXPORT_SYMBOL_GPL(comedi_request_region);
/**
* comedi_legacy_detach() - A generic (*detach) function for legacy drivers.
* @dev: comedi_device struct
*/
void comedi_legacy_detach(struct comedi_device *dev)
{
if (dev->irq) {
free_irq(dev->irq, dev);
dev->irq = 0;
}
if (dev->iobase && dev->iolen) {
release_region(dev->iobase, dev->iolen);
dev->iobase = 0;
dev->iolen = 0;
}
}
EXPORT_SYMBOL_GPL(comedi_legacy_detach);
int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct comedi_driver *driv;
int ret;
if (dev->attached)
return -EBUSY;
mutex_lock(&comedi_drivers_list_lock);
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);
}
ret = -EIO;
goto out;
}
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);
ret = -ENOSYS;
goto out;
}
/* initialize dev->driver here so
* comedi_error() can be called from attach */
dev->driver = driv;
dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr
: dev->driver->driver_name;
ret = driv->attach(dev, it);
if (ret >= 0)
ret = comedi_device_postconfig(dev);
if (ret < 0) {
comedi_device_detach(dev);
module_put(driv->module);
}
/* On success, the driver module count has been incremented. */
out:
mutex_unlock(&comedi_drivers_list_lock);
return ret;
}
int comedi_auto_config(struct device *hardware_device,
struct comedi_driver *driver, unsigned long context)
{
struct comedi_device *dev;
int ret;
if (!hardware_device) {
pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n");
return -EINVAL;
}
if (!driver) {
dev_warn(hardware_device,
"BUG! comedi_auto_config called with NULL comedi driver\n");
return -EINVAL;
}
if (!driver->auto_attach) {
dev_warn(hardware_device,
"BUG! comedi driver '%s' has no auto_attach handler\n",
driver->driver_name);
return -EINVAL;
}
dev = comedi_alloc_board_minor(hardware_device);
if (IS_ERR(dev))
return PTR_ERR(dev);
/* Note: comedi_alloc_board_minor() locked dev->mutex. */
dev->driver = driver;
dev->board_name = dev->driver->driver_name;
ret = driver->auto_attach(dev, context);
if (ret >= 0)
ret = comedi_device_postconfig(dev);
if (ret < 0)
comedi_device_detach(dev);
mutex_unlock(&dev->mutex);
if (ret < 0)
comedi_release_hardware_device(hardware_device);
return ret;
}
EXPORT_SYMBOL_GPL(comedi_auto_config);
void comedi_auto_unconfig(struct device *hardware_device)
{
if (hardware_device == NULL)
return;
comedi_release_hardware_device(hardware_device);
}
EXPORT_SYMBOL_GPL(comedi_auto_unconfig);
int comedi_driver_register(struct comedi_driver *driver)
{
mutex_lock(&comedi_drivers_list_lock);
driver->next = comedi_drivers;
comedi_drivers = driver;
mutex_unlock(&comedi_drivers_list_lock);
return 0;
}
EXPORT_SYMBOL_GPL(comedi_driver_register);
void comedi_driver_unregister(struct comedi_driver *driver)
{
struct comedi_driver *prev;
int i;
/* unlink the driver */
mutex_lock(&comedi_drivers_list_lock);
if (comedi_drivers == driver) {
comedi_drivers = driver->next;
} else {
for (prev = comedi_drivers; prev->next; prev = prev->next) {
if (prev->next == driver) {
prev->next = driver->next;
break;
}
}
}
mutex_unlock(&comedi_drivers_list_lock);
/* check for devices using this driver */
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
struct comedi_device *dev = comedi_dev_from_minor(i);
if (!dev)
continue;
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);
}
}
EXPORT_SYMBOL_GPL(comedi_driver_unregister);