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usb: gadget: f_mass_storage: convert to new function interface with backward compatibility

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Converting mass storage to the new function interface requires converting
the USB mass storage's function code and its users.
This patch converts the f_mass_storage.c to the new function interface.
The file is now compiled into a separate usb_f_mass_storage.ko module.
The old function interface is provided by means of a preprocessor conditional
directives. After all users are converted, the old interface can be removed.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2013-10-09 10:06:01 +02:00 committed by Felipe Balbi
parent 5de862d73b
commit e5eaa0dc48
7 changed files with 179 additions and 22 deletions
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3
drivers/usb/gadget/Kconfig
View File

@ -528,6 +528,9 @@ config USB_F_RNDIS
config USB_U_MS
tristate
config USB_F_MASS_STORAGE
tristate
choice
tristate "USB Gadget Drivers"
default USB_ETH

2
drivers/usb/gadget/Makefile
View File

@ -62,6 +62,8 @@ usb_f_rndis-y := f_rndis.o
obj-$(CONFIG_USB_F_RNDIS) += usb_f_rndis.o
u_ms-y := storage_common.o
obj-$(CONFIG_USB_U_MS) += u_ms.o
usb_f_mass_storage-y := f_mass_storage.o
obj-$(CONFIG_USB_F_MASS_STORAGE)+= usb_f_mass_storage.o
#
# USB gadget drivers

1
drivers/usb/gadget/acm_ms.c
View File

@ -40,6 +40,7 @@
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#define USB_FMS_INCLUDED
#include "f_mass_storage.c"
/*-------------------------------------------------------------------------*/

178
drivers/usb/gadget/f_mass_storage.c
View File

@ -213,6 +213,7 @@
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/freezer.h>
#include <linux/module.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
@ -226,6 +227,13 @@
#define FSG_DRIVER_DESC "Mass Storage Function"
#define FSG_DRIVER_VERSION "2009/09/11"
/* to avoid a lot of #ifndef-#endif in the temporary compatibility layer */
#ifndef USB_FMS_INCLUDED
#define EXPORT_SYMBOL_GPL_IF_MODULE(m) EXPORT_SYMBOL_GPL(m);
#else
#define EXPORT_SYMBOL_GPL_IF_MODULE(m)
#endif
static const char fsg_string_interface[] = "Mass Storage";
#include "storage_common.h"
@ -2627,11 +2635,13 @@ void fsg_common_get(struct fsg_common *common)
{
kref_get(&common->ref);
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_get);
void fsg_common_put(struct fsg_common *common)
{
kref_put(&common->ref, fsg_common_release);
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_put);
/* check if fsg_num_buffers is within a valid range */
static inline int fsg_num_buffers_validate(unsigned int fsg_num_buffers)
@ -2643,7 +2653,7 @@ static inline int fsg_num_buffers_validate(unsigned int fsg_num_buffers)
return -EINVAL;
}
static struct fsg_common *fsg_common_setup(struct fsg_common *common)
static struct fsg_common *fsg_common_setup(struct fsg_common *common, bool zero)
{
if (!common) {
common = kzalloc(sizeof(*common), GFP_KERNEL);
@ -2651,7 +2661,8 @@ static struct fsg_common *fsg_common_setup(struct fsg_common *common)
return ERR_PTR(-ENOMEM);
common->free_storage_on_release = 1;
} else {
memset(common, 0, sizeof(*common));
if (zero)
memset(common, 0, sizeof(*common));
common->free_storage_on_release = 0;
}
init_rwsem(&common->filesem);
@ -2668,6 +2679,7 @@ void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs)
{
common->sysfs = sysfs;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_set_sysfs);
static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n)
{
@ -2723,6 +2735,7 @@ error_release:
return -ENOMEM;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_set_num_buffers);
static inline void fsg_common_remove_sysfs(struct fsg_lun *lun)
{
@ -2761,6 +2774,7 @@ void fsg_common_remove_lun(struct fsg_lun *lun, bool sysfs)
fsg_lun_close(lun);
kfree(lun);
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_remove_lun);
static void _fsg_common_remove_luns(struct fsg_common *common, int n)
{
@ -2772,6 +2786,7 @@ static void _fsg_common_remove_luns(struct fsg_common *common, int n)
common->luns[i] = NULL;
}
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_remove_luns);
void fsg_common_remove_luns(struct fsg_common *common)
{
@ -2784,6 +2799,7 @@ void fsg_common_free_luns(struct fsg_common *common)
kfree(common->luns);
common->luns = NULL;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_free_luns);
int fsg_common_set_nluns(struct fsg_common *common, int nluns)
{
@ -2809,6 +2825,14 @@ int fsg_common_set_nluns(struct fsg_common *common, int nluns)
return 0;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_set_nluns);
void fsg_common_free_buffers(struct fsg_common *common)
{
_fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers);
common->buffhds = NULL;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_free_buffers);
int fsg_common_set_cdev(struct fsg_common *common,
struct usb_composite_dev *cdev, bool can_stall)
@ -2836,6 +2860,7 @@ int fsg_common_set_cdev(struct fsg_common *common,
return 0;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_set_cdev);
static inline int fsg_common_add_sysfs(struct fsg_common *common,
struct fsg_lun *lun)
@ -2958,6 +2983,7 @@ error_sysfs:
kfree(lun);
return rc;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_create_lun);
int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg)
{
@ -2979,6 +3005,7 @@ fail:
_fsg_common_remove_luns(common, i);
return rc;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_create_luns);
void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
const char *pn)
@ -2995,6 +3022,7 @@ void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
: "File-Stor Gadget"),
i);
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_set_inquiry_string);
int fsg_common_run_thread(struct fsg_common *common)
{
@ -3013,6 +3041,7 @@ int fsg_common_run_thread(struct fsg_common *common)
return 0;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_run_thread);
struct fsg_common *fsg_common_init(struct fsg_common *common,
struct usb_composite_dev *cdev,
@ -3020,7 +3049,7 @@ struct fsg_common *fsg_common_init(struct fsg_common *common,
{
int rc;
common = fsg_common_setup(common);
common = fsg_common_setup(common, !!common);
if (IS_ERR(common))
return common;
fsg_common_set_sysfs(common, true);
@ -3066,6 +3095,7 @@ error_release:
fsg_common_release(&common->ref);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_common_init);
static void fsg_common_release(struct kref *ref)
{
@ -3105,24 +3135,6 @@ static void fsg_common_release(struct kref *ref)
/*-------------------------------------------------------------------------*/
static void fsg_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_common *common = fsg->common;
DBG(fsg, "unbind\n");
if (fsg->common->fsg == fsg) {
fsg->common->new_fsg = NULL;
raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE);
/* FIXME: make interruptible or killable somehow? */
wait_event(common->fsg_wait, common->fsg != fsg);
}
fsg_common_put(common);
usb_free_all_descriptors(&fsg->function);
kfree(fsg);
}
static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
@ -3132,6 +3144,21 @@ static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
unsigned max_burst;
int ret;
#ifndef USB_FMS_INCLUDED
struct fsg_opts *opts;
opts = fsg_opts_from_func_inst(f->fi);
if (!opts->no_configfs) {
ret = fsg_common_set_cdev(fsg->common, c->cdev,
fsg->common->can_stall);
if (ret)
return ret;
fsg_common_set_inquiry_string(fsg->common, 0, 0);
ret = fsg_common_run_thread(fsg->common);
if (ret)
return ret;
}
#endif
fsg->gadget = gadget;
/* New interface */
@ -3183,7 +3210,31 @@ autoconf_fail:
return -ENOTSUPP;
}
/****************************** ADD FUNCTION ******************************/
/****************************** ALLOCATE FUNCTION *************************/
static void fsg_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_common *common = fsg->common;
DBG(fsg, "unbind\n");
if (fsg->common->fsg == fsg) {
fsg->common->new_fsg = NULL;
raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE);
/* FIXME: make interruptible or killable somehow? */
wait_event(common->fsg_wait, common->fsg != fsg);
}
#ifdef USB_FMS_INCLUDED
fsg_common_put(common);
#endif
usb_free_all_descriptors(&fsg->function);
#ifdef USB_FMS_INCLUDED
kfree(fsg);
#endif
}
#ifdef USB_FMS_INCLUDED
static int fsg_bind_config(struct usb_composite_dev *cdev,
struct usb_configuration *c,
@ -3220,6 +3271,88 @@ static int fsg_bind_config(struct usb_composite_dev *cdev,
return rc;
}
#else
static void fsg_free_inst(struct usb_function_instance *fi)
{
struct fsg_opts *opts;
opts = fsg_opts_from_func_inst(fi);
fsg_common_put(opts->common);
kfree(opts);
}
static struct usb_function_instance *fsg_alloc_inst(void)
{
struct fsg_opts *opts;
int rc;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
opts->func_inst.free_func_inst = fsg_free_inst;
opts->common = fsg_common_setup(opts->common, false);
if (IS_ERR(opts->common)) {
rc = PTR_ERR(opts->common);
goto release_opts;
}
rc = fsg_common_set_nluns(opts->common, FSG_MAX_LUNS);
if (rc)
goto release_opts;
rc = fsg_common_set_num_buffers(opts->common,
CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS);
if (rc)
goto release_luns;
pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n");
return &opts->func_inst;
release_luns:
kfree(opts->common->luns);
release_opts:
kfree(opts);
return ERR_PTR(rc);
}
static void fsg_free(struct usb_function *f)
{
struct fsg_dev *fsg;
fsg = container_of(f, struct fsg_dev, function);
kfree(fsg);
}
static struct usb_function *fsg_alloc(struct usb_function_instance *fi)
{
struct fsg_opts *opts = fsg_opts_from_func_inst(fi);
struct fsg_common *common = opts->common;
struct fsg_dev *fsg;
fsg = kzalloc(sizeof(*fsg), GFP_KERNEL);
if (unlikely(!fsg))
return ERR_PTR(-ENOMEM);
fsg->function.name = FSG_DRIVER_DESC;
fsg->function.bind = fsg_bind;
fsg->function.unbind = fsg_unbind;
fsg->function.setup = fsg_setup;
fsg->function.set_alt = fsg_set_alt;
fsg->function.disable = fsg_disable;
fsg->function.free_func = fsg_free;
fsg->common = common;
return &fsg->function;
}
DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Nazarewicz");
#endif
/************************* Module parameters *************************/
@ -3256,4 +3389,5 @@ void fsg_config_from_params(struct fsg_config *cfg,
cfg->can_stall = params->stall;
cfg->fsg_num_buffers = fsg_num_buffers;
}
EXPORT_SYMBOL_GPL_IF_MODULE(fsg_config_from_params);

15
drivers/usb/gadget/f_mass_storage.h
View File

@ -1,6 +1,7 @@
#ifndef USB_F_MASS_STORAGE_H
#define USB_F_MASS_STORAGE_H
#include <linux/usb/composite.h>
#include "storage_common.h"
struct fsg_module_parameters {
@ -70,6 +71,12 @@ struct fsg_operations {
int (*thread_exits)(struct fsg_common *common);
};
struct fsg_opts {
struct fsg_common *common;
struct usb_function_instance func_inst;
bool no_configfs; /* for legacy gadgets */
};
struct fsg_lun_config {
const char *filename;
char ro;
@ -94,6 +101,12 @@ struct fsg_config {
unsigned int fsg_num_buffers;
};
static inline struct fsg_opts *
fsg_opts_from_func_inst(const struct usb_function_instance *fi)
{
return container_of(fi, struct fsg_opts, func_inst);
}
void fsg_common_get(struct fsg_common *common);
void fsg_common_put(struct fsg_common *common);
@ -106,6 +119,8 @@ void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs);
int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n);
void fsg_common_free_buffers(struct fsg_common *common);
int fsg_common_set_cdev(struct fsg_common *common,
struct usb_composite_dev *cdev, bool can_stall);

1
drivers/usb/gadget/mass_storage.c
View File

@ -55,6 +55,7 @@
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#define USB_FMS_INCLUDED
#include "f_mass_storage.c"
/*-------------------------------------------------------------------------*/

1
drivers/usb/gadget/multi.c
View File

@ -41,6 +41,7 @@ MODULE_LICENSE("GPL");
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#define USB_FMS_INCLUDED
#include "f_mass_storage.c"
#define USBF_ECM_INCLUDED