diff options
| author |   Jeremy Kerr <jk@ozlabs.org> | 2017-06-06 16:08:36 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-09 11:52:07 +0200 |
| commit | 09aecfab93b8f728c5d65d33f26055b7e726df3b (patch) | |
| tree | 07849ad0a3a42c9a608f00f49c545839e734314e /drivers/fsi/fsi-core.c | |
| parent | config: android-base: disable CONFIG_NFSD and CONFIG_NFS_FS (diff) | |
| download | linux-dev-09aecfab93b8f728c5d65d33f26055b7e726df3b.tar.xz linux-dev-09aecfab93b8f728c5d65d33f26055b7e726df3b.zip | |
drivers/fsi: Add fsi master definition
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>
Diffstat (limited to 'drivers/fsi/fsi-core.c')
| -rw-r--r-- | drivers/fsi/fsi-core.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 3d55bd547178..ca02913866f5 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -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) |