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authorTomas Winkler <tomas.winkler@intel.com>2015-07-23 15:08:43 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-03 17:24:16 -0700
commit71ce789115f878a07e4a6c43d6006cea6aee1078 (patch)
treeaef1e29741969c8b7b3d0501e4c451fba1fe456a /drivers/misc
parent0ff0a8d853039aa60bba3ca3e04e4fb74584a736 (diff)
mei: bus: enable running fixup routines before device registration
Split the device registration into allocation and device struct initialization, device setup, and the final device registration. This why it is possible to run fixups and quirks during the setup stage on an initialized device. Each fixup routine effects do_match flag. If the flag is set to false at the end the device won't be registered on the bus. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/bus-fixup.c30
-rw-r--r--drivers/misc/mei/bus.c91
-rw-r--r--drivers/misc/mei/mei_dev.h2
3 files changed, 107 insertions, 16 deletions
diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 47aa1523d9e1..865e33bcd226 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -20,12 +20,15 @@
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/slab.h>
+#include <linux/uuid.h>
#include <linux/mei_cl_bus.h>
#include "mei_dev.h"
#include "client.h"
+#define MEI_UUID_ANY NULL_UUID_LE
+
struct mei_nfc_cmd {
u8 command;
u8 status;
@@ -412,4 +415,31 @@ void mei_nfc_host_exit(struct mei_device *bus)
mutex_unlock(&bus->device_lock);
}
+#define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
+
+static struct mei_fixup {
+
+ const uuid_le uuid;
+ void (*hook)(struct mei_cl_device *cldev);
+} mei_fixups[] = {};
+
+/**
+ * mei_cl_dev_fixup - run fixup handlers
+ *
+ * @cldev: me client device
+ */
+void mei_cl_dev_fixup(struct mei_cl_device *cldev)
+{
+ struct mei_fixup *f;
+ const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
+
+ f = &mei_fixups[i];
+ if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
+ uuid_le_cmp(f->uuid, *uuid) == 0)
+ f->hook(cldev);
+ }
+}
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 34b14dda050c..68b7756bf384 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -436,6 +436,9 @@ static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
if (!cldev)
return 0;
+ if (!cldev->do_match)
+ return 0;
+
if (!cldrv || !cldrv->id_table)
return 0;
@@ -634,6 +637,76 @@ struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *bus,
return NULL;
}
+/**
+ * mei_cl_dev_alloc - initialize and allocate mei client device
+ *
+ * @bus: mei device
+ * @me_cl: me client
+ *
+ * Return: allocated device structur or NULL on allocation failure
+ */
+static struct mei_cl_device *mei_cl_dev_alloc(struct mei_device *bus,
+ struct mei_me_client *me_cl)
+{
+ struct mei_cl_device *cldev;
+
+ cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
+ if (!cldev)
+ return NULL;
+
+ device_initialize(&cldev->dev);
+ cldev->dev.parent = bus->dev;
+ cldev->dev.bus = &mei_cl_bus_type;
+ cldev->dev.type = &mei_cl_device_type;
+ cldev->bus = mei_dev_bus_get(bus);
+ cldev->me_cl = mei_me_cl_get(me_cl);
+ cldev->is_added = 0;
+ INIT_LIST_HEAD(&cldev->bus_list);
+
+ return cldev;
+}
+
+/**
+ * mei_cl_dev_setup - setup me client device
+ * run fix up routines and set the device name
+ *
+ * @bus: mei device
+ * @cldev: me client device
+ *
+ * Return: true if the device is eligible for enumeration
+ */
+static bool mei_cl_dev_setup(struct mei_device *bus,
+ struct mei_cl_device *cldev)
+{
+ cldev->do_match = 1;
+ mei_cl_dev_fixup(cldev);
+
+ if (cldev->do_match)
+ dev_set_name(&cldev->dev, "mei:%s:%pUl",
+ cldev->name, mei_me_cl_uuid(cldev->me_cl));
+
+ return cldev->do_match == 1;
+}
+
+/**
+ * mei_cl_bus_dev_add - add me client devices
+ *
+ * @cldev: me client device
+ *
+ * Return: 0 on success; < 0 on failre
+ */
+static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
+{
+ int ret;
+
+ dev_dbg(cldev->bus->dev, "adding %pUL\n", mei_me_cl_uuid(cldev->me_cl));
+ ret = device_add(&cldev->dev);
+ if (!ret)
+ cldev->is_added = 1;
+
+ return ret;
+}
+
struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
struct mei_me_client *me_cl,
struct mei_cl *cl,
@@ -642,28 +715,16 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
struct mei_cl_device *cldev;
int status;
- cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
+ cldev = mei_cl_dev_alloc(bus, me_cl);
if (!cldev)
return NULL;
- cldev->me_cl = mei_me_cl_get(me_cl);
- if (!cldev->me_cl) {
- kfree(cldev);
- return NULL;
- }
-
cldev->cl = cl;
- cldev->dev.parent = bus->dev;
- cldev->dev.bus = &mei_cl_bus_type;
- cldev->dev.type = &mei_cl_device_type;
- cldev->bus = mei_dev_bus_get(bus);
- INIT_LIST_HEAD(&cldev->bus_list);
-
strlcpy(cldev->name, name, sizeof(cldev->name));
- dev_set_name(&cldev->dev, "mei:%s:%pUl", name, mei_me_cl_uuid(me_cl));
+ mei_cl_dev_setup(bus, cldev);
- status = device_register(&cldev->dev);
+ status = mei_cl_bus_dev_add(cldev);
if (status) {
dev_err(bus->dev, "Failed to register MEI device\n");
mei_me_cl_put(cldev->me_cl);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 882e6f77084a..ad59ab776f2d 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -335,7 +335,7 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
struct mei_cl *cl,
char *name);
void mei_cl_remove_device(struct mei_cl_device *cldev);
-
+void mei_cl_dev_fixup(struct mei_cl_device *dev);
ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
bool blocking);
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);