fpga: add method to get fpga manager from device

The intent is to provide a non-DT method of getting
ahold of a FPGA manager to do some FPGA programming.

This patch refactors of_fpga_mgr_get() to reuse most of it
while adding a new method fpga_mgr_get() for getting a
pointer to a fpga manager struct, given the device.

Signed-off-by: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Tull 2016-11-01 14:14:23 -05:00 committed by Greg Kroah-Hartman
parent 39a842e22c
commit 9dce0287a6
3 changed files with 60 additions and 24 deletions

View File

@ -38,11 +38,13 @@ To get/put a reference to a FPGA manager:
-----------------------------------------
struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
struct fpga_manager *fpga_mgr_get(struct device *dev);
Given a DT node or device, get an exclusive reference to a FPGA manager.
void fpga_mgr_put(struct fpga_manager *mgr);
Given a DT node, get an exclusive reference to a FPGA manager or release
the reference.
Release the reference.
To register or unregister the low level FPGA-specific driver:

View File

@ -39,7 +39,8 @@ static struct class *fpga_mgr_class;
* Step the low level fpga manager through the device-specific steps of getting
* an FPGA ready to be configured, writing the image to it, then doing whatever
* post-configuration steps necessary. This code assumes the caller got the
* mgr pointer from of_fpga_mgr_get() and checked that it is not an error code.
* mgr pointer from of_fpga_mgr_get() or fpga_mgr_get() and checked that it is
* not an error code.
*
* Return: 0 on success, negative error code otherwise.
*/
@ -99,7 +100,8 @@ EXPORT_SYMBOL_GPL(fpga_mgr_buf_load);
* Request an FPGA image using the firmware class, then write out to the FPGA.
* Update the state before each step to provide info on what step failed if
* there is a failure. This code assumes the caller got the mgr pointer
* from of_fpga_mgr_get() and checked that it is not an error code.
* from of_fpga_mgr_get() or fpga_mgr_get() and checked that it is not an error
* code.
*
* Return: 0 on success, negative error code otherwise.
*/
@ -181,30 +183,11 @@ static struct attribute *fpga_mgr_attrs[] = {
};
ATTRIBUTE_GROUPS(fpga_mgr);
static int fpga_mgr_of_node_match(struct device *dev, const void *data)
{
return dev->of_node == data;
}
/**
* of_fpga_mgr_get - get an exclusive reference to a fpga mgr
* @node: device node
*
* Given a device node, get an exclusive reference to a fpga mgr.
*
* Return: fpga manager struct or IS_ERR() condition containing error code.
*/
struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
struct fpga_manager *__fpga_mgr_get(struct device *dev)
{
struct fpga_manager *mgr;
struct device *dev;
int ret = -ENODEV;
dev = class_find_device(fpga_mgr_class, NULL, node,
fpga_mgr_of_node_match);
if (!dev)
return ERR_PTR(-ENODEV);
mgr = to_fpga_manager(dev);
if (!mgr)
goto err_dev;
@ -226,6 +209,55 @@ err_dev:
put_device(dev);
return ERR_PTR(ret);
}
static int fpga_mgr_dev_match(struct device *dev, const void *data)
{
return dev->parent == data;
}
/**
* fpga_mgr_get - get an exclusive reference to a fpga mgr
* @dev: parent device that fpga mgr was registered with
*
* Given a device, get an exclusive reference to a fpga mgr.
*
* Return: fpga manager struct or IS_ERR() condition containing error code.
*/
struct fpga_manager *fpga_mgr_get(struct device *dev)
{
struct device *mgr_dev = class_find_device(fpga_mgr_class, NULL, dev,
fpga_mgr_dev_match);
if (!mgr_dev)
return ERR_PTR(-ENODEV);
return __fpga_mgr_get(mgr_dev);
}
EXPORT_SYMBOL_GPL(fpga_mgr_get);
static int fpga_mgr_of_node_match(struct device *dev, const void *data)
{
return dev->of_node == data;
}
/**
* of_fpga_mgr_get - get an exclusive reference to a fpga mgr
* @node: device node
*
* Given a device node, get an exclusive reference to a fpga mgr.
*
* Return: fpga manager struct or IS_ERR() condition containing error code.
*/
struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
{
struct device *dev;
dev = class_find_device(fpga_mgr_class, NULL, node,
fpga_mgr_of_node_match);
if (!dev)
return ERR_PTR(-ENODEV);
return __fpga_mgr_get(dev);
}
EXPORT_SYMBOL_GPL(of_fpga_mgr_get);
/**

View File

@ -117,6 +117,8 @@ int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags,
struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
struct fpga_manager *fpga_mgr_get(struct device *dev);
void fpga_mgr_put(struct fpga_manager *mgr);
int fpga_mgr_register(struct device *dev, const char *name,