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drivers/fsi: Add fsi master definition

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Add a `struct fsi_master` to represent a FSI master controller.

FSI master drivers register one of these structs to provide
device-specific of the standard operations: read/write/term/break and
link control.

Includes changes from Edward A. James <eajames@us.ibm.com> & Jeremy Kerr
<jk@ozlabs.org>.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Kerr
2017-06-06 16:08:36 -05:00
committed by Greg Kroah-Hartman
parent 9e69dd0179
commit 09aecfab93
2 changed files with 76 additions and 0 deletions
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35
drivers/fsi/fsi-core.c
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@@ -15,8 +15,43 @@
#include <linux/device.h>
#include <linux/fsi.h>
#include <linux/idr.h>
#include <linux/module.h>
#include "fsi-master.h"
static DEFINE_IDA(master_ida);
/* FSI master support */
int fsi_master_register(struct fsi_master *master)
{
int rc;
if (!master)
return -EINVAL;
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
dev_set_name(&master->dev, "fsi%d", master->idx);
rc = device_register(&master->dev);
if (rc)
ida_simple_remove(&master_ida, master->idx);
return rc;
}
EXPORT_SYMBOL_GPL(fsi_master_register);
void fsi_master_unregister(struct fsi_master *master)
{
if (master->idx >= 0) {
ida_simple_remove(&master_ida, master->idx);
master->idx = -1;
}
device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(fsi_master_unregister);
/* FSI core & Linux bus type definitions */
static int fsi_bus_match(struct device *dev, struct device_driver *drv)