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staging: comedi: add generic auto-config functions

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Add (and export) generic auto-config function `comedi_auto_config()` to
allow hardware devices on arbitrary bus types (e.g. platform devices,
spi devices, etc.) to be auto-configured as comedi devices.  This uses a
new `auto_attach()` hook in the `struct comedi_driver`.  This new hook
will eventually replace the bus-specific `attach_pci()` and
`attach_usb()` hooks in the low-level comedi drivers.

When the `auto_attach()` hook is called in the low-level driver, the
`hw_dev` member of the `struct comedi_device` will have already been set
to the hardware device passed to `comedi_auto_config()`.  The low-level
driver can convert this to some bus-device wrapper structure pointer,
possibly with the help of the `context` parameter that is passed
unchanged from the `comedi_auto_config()` call.

Also export the existing `comedi_auto_unconfig()` function as the
matching call to `comedi_auto_config()`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2012-10-27 21:44:14 +01:00 committed by Greg Kroah-Hartman
parent 156096a039
commit 8ed705aff0
2 changed files with 26 additions and 1 deletions
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4
drivers/staging/comedi/comedidev.h
View File

@ -204,6 +204,7 @@ struct comedi_driver {
void (*detach) (struct comedi_device *);
int (*attach_pci) (struct comedi_device *, struct pci_dev *);
int (*attach_usb) (struct comedi_device *, struct usb_interface *);
int (*auto_attach) (struct comedi_device *, unsigned long);
/* number of elements in board_name and board_id arrays */
unsigned int num_names;
@ -510,6 +511,9 @@ static inline void *comedi_aux_data(int options[], int n)
int comedi_alloc_subdevice_minor(struct comedi_device *dev,
struct comedi_subdevice *s);
void comedi_free_subdevice_minor(struct comedi_subdevice *s);
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_pci_auto_config(struct pci_dev *pcidev,
struct comedi_driver *driver);
void comedi_pci_auto_unconfig(struct pci_dev *pcidev);

23
drivers/staging/comedi/drivers.c
View File

@ -922,7 +922,27 @@ static int comedi_old_auto_config(struct device *hardware_device,
(unsigned long)&it);
}
static void comedi_auto_unconfig(struct device *hardware_device)
static int comedi_auto_config_wrapper(struct comedi_device *dev,
unsigned long context)
{
if (!dev->driver->auto_attach) {
dev_warn(dev->class_dev,
"BUG! driver '%s' has no auto_attach handler\n",
dev->driver->driver_name);
return -EINVAL;
}
return dev->driver->auto_attach(dev, context);
}
int comedi_auto_config(struct device *hardware_device,
struct comedi_driver *driver, unsigned long context)
{
return comedi_auto_config_helper(hardware_device, driver,
comedi_auto_config_wrapper, context);
}
EXPORT_SYMBOL_GPL(comedi_auto_config);
void comedi_auto_unconfig(struct device *hardware_device)
{
int minor;
@ -934,6 +954,7 @@ static void comedi_auto_unconfig(struct device *hardware_device)
BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
comedi_free_board_minor(minor);
}
EXPORT_SYMBOL_GPL(comedi_auto_unconfig);
/**
* comedi_pci_enable() - Enable the PCI device and request the regions.