Commit 4bb8548d authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Nicholas Bellinger

usb: gadget: f_tcm: add configfs support

Allow using the tcm function as a component of a gadget composed with
ConfigFS.
Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Acked-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 9beab5d4
What: /config/usb-gadget/gadget/functions/tcm.name
Date: Dec 2015
KernelVersion: 4.5
Description:
There are no attributes because all the configuration
is performed in the "target" subsystem of configfs.
......@@ -454,6 +454,20 @@ config USB_CONFIGFS_F_PRINTER
For more information, see Documentation/usb/gadget_printer.txt
which includes sample code for accessing the device file.
config USB_CONFIGFS_F_TCM
bool "USB Gadget Target Fabric"
depends on TARGET_CORE
depends on USB_CONFIGFS
select USB_LIBCOMPOSITE
select USB_F_TCM
help
This fabric is a USB gadget component. Two USB protocols are
supported that is BBB or BOT (Bulk Only Transport) and UAS
(USB Attached SCSI). BOT is advertised on alternative
interface 0 (primary) and UAS is on alternative interface 1.
Both protocols can work on USB2.0 and USB3.0.
UAS utilizes the USB 3.0 feature called streams support.
source "drivers/usb/gadget/legacy/Kconfig"
endchoice
......
......@@ -23,6 +23,7 @@
#include "tcm.h"
#include "u_tcm.h"
#include "configfs.h"
#define TPG_INSTANCES 1
......@@ -1402,8 +1403,16 @@ static struct se_portal_group *usbg_make_tpg(
if (!opts->ready)
goto unlock_dep;
if (opts->has_dep && !try_module_get(opts->dependent))
goto unlock_dep;
if (opts->has_dep) {
if (!try_module_get(opts->dependent))
goto unlock_dep;
} else {
ret = configfs_depend_item_unlocked(
group->cg_subsys,
&opts->func_inst.group.cg_item);
if (ret)
goto unlock_dep;
}
tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
ret = -ENOMEM;
......@@ -1437,7 +1446,10 @@ static struct se_portal_group *usbg_make_tpg(
free_tpg:
kfree(tpg);
unref_dep:
module_put(opts->dependent);
if (opts->has_dep)
module_put(opts->dependent);
else
configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
unlock_dep:
mutex_unlock(&opts->dep_lock);
unlock_inst:
......@@ -1468,7 +1480,10 @@ static void usbg_drop_tpg(struct se_portal_group *se_tpg)
opts = container_of(tpg_instances[i].func_inst,
struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
module_put(opts->dependent);
if (opts->has_dep)
module_put(opts->dependent);
else
configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
mutex_unlock(&opts->dep_lock);
mutex_unlock(&tpg_instances_lock);
......@@ -2175,6 +2190,28 @@ static int tcm_setup(struct usb_function *f,
return usbg_bot_setup(f, ctrl);
}
static inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_tcm_opts,
func_inst.group);
}
static void tcm_attr_release(struct config_item *item)
{
struct f_tcm_opts *opts = to_f_tcm_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations tcm_item_ops = {
.release = tcm_attr_release,
};
static struct config_item_type tcm_func_type = {
.ct_item_ops = &tcm_item_ops,
.ct_owner = THIS_MODULE,
};
static void tcm_free_inst(struct usb_function_instance *f)
{
struct f_tcm_opts *opts;
......@@ -2193,6 +2230,28 @@ static void tcm_free_inst(struct usb_function_instance *f)
kfree(opts);
}
static int tcm_register_callback(struct usb_function_instance *f)
{
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
opts->can_attach = true;
mutex_unlock(&opts->dep_lock);
return 0;
}
static void tcm_unregister_callback(struct usb_function_instance *f)
{
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
unregister_gadget_item(opts->
func_inst.group.cg_item.ci_parent->ci_parent);
opts->can_attach = false;
mutex_unlock(&opts->dep_lock);
}
static int usbg_attach(struct usbg_tpg *tpg)
{
struct usb_function_instance *f = tpg->fi;
......@@ -2252,6 +2311,11 @@ static struct usb_function_instance *tcm_alloc_inst(void)
mutex_init(&opts->dep_lock);
opts->func_inst.set_inst_name = tcm_set_name;
opts->func_inst.free_func_inst = tcm_free_inst;
opts->tcm_register_callback = tcm_register_callback;
opts->tcm_unregister_callback = tcm_unregister_callback;
config_group_init_type_name(&opts->func_inst.group, "",
&tcm_func_type);
return &opts->func_inst;
}
......
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