Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
.../ABI/testing/configfs-usb-gadget-mass-storage | 31 ++
drivers/usb/gadget/Kconfig | 11 +
drivers/usb/gadget/f_mass_storage.c | 368 ++++++++++++++++++++
drivers/usb/gadget/f_mass_storage.h | 17 +
4 files changed, 427 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-mass-storage
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-mass-storage b/Documentation/ABI/testing/configfs-usb-gadget-mass-storage
new file mode 100644
index 0000000..e1e918e
--- /dev/null
+++ b/Documentation/ABI/testing/configfs-usb-gadget-mass-storage
@@ -0,0 +1,31 @@
+What: /config/usb-gadget/gadget/functions/mass_storage.name
+Date: Jul 2013
+KenelVersion: 3.12
+Description:
+ The attributes:
+
+ stall - Set to permit function to halt bulk endpoints.
+ Disabled on some USB devices known not to work
+ correctly. You should set it to true.
+ num_buffers - Number of pipeline buffers. Valid numbers
+ are 2..4. Available only if
+ CONFIG_USB_GADGET_DEBUG_FILES is set.
+
+What: /config/usb-gadget/gadget/functions/mass_storage.name/lun.name
+Date: Jul 2013
+KenelVersion: 3.12
+Description:
+ The attributes:
+
+ file - The path to the backing file for the LUN.
+ Required if LUN is not marked as removable.
+ ro - Flag specifying access to the LUN shall be
+ read-only. This is implied if CD-ROM emulation
+ is enabled as well as when it was impossible
+ to open "filename" in R/W mode.
+ removable - Flag specifying that LUN shall be indicated as
+ being removable.
+ cdrom - Flag specifying that LUN shall be reported as
+ being a CD-ROM.
+ nofua - Flag specifying that FUA flag
+ in SCSI WRITE(10,12)
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index a678f35..8b0b965 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -727,6 +727,17 @@ config USB_CONFIGFS_PHONET
help
The Phonet protocol implementation for USB device.
+config USB_CONFIGFS_MASS_STORAGE
+ boolean "Mass storage"
+ depends on USB_CONFIGFS
+ select USB_U_MS
+ select USB_F_MASS_STORAGE
+ help
+ The Mass Storage Gadget acts as a USB Mass Storage disk drive.
+ As its storage repository it can use a regular file or a block
+ device (in much the same way as the "loop" device driver),
+ specified as a module parameter or sysfs option.
+
config USB_ZERO
tristate "Gadget Zero (DEVELOPMENT)"
select USB_LIBCOMPOSITE
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 1c5dc0a..70db26a 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -220,6 +220,7 @@
#include <linux/usb/composite.h>
#include "gadget_chips.h"
+#include "configfs.h"
/*------------------------------------------------------------------------*/
@@ -3349,6 +3350,350 @@ static int fsg_bind_config(struct usb_composite_dev *cdev,
#else
+static inline struct fsg_lun_opts *to_fsg_lun_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct fsg_lun_opts, group);
+}
+
+static inline struct fsg_opts *to_fsg_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct fsg_opts,
+ func_inst.group);
+}
+
+CONFIGFS_ATTR_STRUCT(fsg_lun_opts);
+CONFIGFS_ATTR_OPS(fsg_lun_opts);
+
+static void fsg_lun_attr_release(struct config_item *item)
+{
+ struct fsg_lun_opts *lun_opts;
+
+ lun_opts = to_fsg_lun_opts(item);
+ kfree(lun_opts);
+}
+
+static struct configfs_item_operations fsg_lun_item_ops = {
+ .release = fsg_lun_attr_release,
+ .show_attribute = fsg_lun_opts_attr_show,
+ .store_attribute = fsg_lun_opts_attr_store,
+};
+
+static ssize_t fsg_lun_opts_file_show(struct fsg_lun_opts *opts, char *page)
+{
+ struct fsg_opts *fsg_opts;
+
+ fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
+
+ return fsg_show_file(opts->lun, &fsg_opts->common->filesem, page);
+}
+
+static ssize_t fsg_lun_opts_file_store(struct fsg_lun_opts *opts,
+ const char *page, size_t len)
+{
+ struct fsg_opts *fsg_opts;
+
+ fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
+
+ return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len);
+}
+
+static struct fsg_lun_opts_attribute fsg_lun_opts_file =
+ __CONFIGFS_ATTR(file, S_IRUGO | S_IWUSR, fsg_lun_opts_file_show,
+ fsg_lun_opts_file_store);
+
+static ssize_t fsg_lun_opts_ro_show(struct fsg_lun_opts *opts, char *page)
+{
+ return fsg_show_ro(opts->lun, page);
+}
+
+static ssize_t fsg_lun_opts_ro_store(struct fsg_lun_opts *opts,
+ const char *page, size_t len)
+{
+ struct fsg_opts *fsg_opts;
+
+ fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
+
+ return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len);
+}
+
+static struct fsg_lun_opts_attribute fsg_lun_opts_ro =
+ __CONFIGFS_ATTR(ro, S_IRUGO | S_IWUSR, fsg_lun_opts_ro_show,
+ fsg_lun_opts_ro_store);
+
+static ssize_t fsg_lun_opts_removable_show(struct fsg_lun_opts *opts,
+ char *page)
+{
+ return fsg_show_removable(opts->lun, page);
+}
+
+static ssize_t fsg_lun_opts_removable_store(struct fsg_lun_opts *opts,
+ const char *page, size_t len)
+{
+ return fsg_store_removable(opts->lun, page, len);
+}
+
+static struct fsg_lun_opts_attribute fsg_lun_opts_removable =
+ __CONFIGFS_ATTR(removable, S_IRUGO | S_IWUSR,
+ fsg_lun_opts_removable_show,
+ fsg_lun_opts_removable_store);
+
+static ssize_t fsg_lun_opts_cdrom_show(struct fsg_lun_opts *opts, char *page)
+{
+ return fsg_show_cdrom(opts->lun, page);
+}
+
+static ssize_t fsg_lun_opts_cdrom_store(struct fsg_lun_opts *opts,
+ const char *page, size_t len)
+{
+ return fsg_store_cdrom(opts->lun, page, len);
+}
+
+static struct fsg_lun_opts_attribute fsg_lun_opts_cdrom =
+ __CONFIGFS_ATTR(cdrom, S_IRUGO | S_IWUSR, fsg_lun_opts_cdrom_show,
+ fsg_lun_opts_cdrom_store);
+
+static ssize_t fsg_lun_opts_nofua_show(struct fsg_lun_opts *opts, char *page)
+{
+ return fsg_show_nofua(opts->lun, page);
+}
+
+static ssize_t fsg_lun_opts_nofua_store(struct fsg_lun_opts *opts,
+ const char *page, size_t len)
+{
+ return fsg_store_nofua(opts->lun, page, len);
+}
+
+static struct fsg_lun_opts_attribute fsg_lun_opts_nofua =
+ __CONFIGFS_ATTR(nofua, S_IRUGO | S_IWUSR, fsg_lun_opts_nofua_show,
+ fsg_lun_opts_nofua_store);
+
+static struct configfs_attribute *fsg_lun_attrs[] = {
+ &fsg_lun_opts_file.attr,
+ &fsg_lun_opts_ro.attr,
+ &fsg_lun_opts_removable.attr,
+ &fsg_lun_opts_cdrom.attr,
+ &fsg_lun_opts_nofua.attr,
+ NULL,
+};
+
+static struct config_item_type fsg_lun_type = {
+ .ct_item_ops = &fsg_lun_item_ops,
+ .ct_attrs = fsg_lun_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+#define MAX_NAME_LEN 40
+
+static struct config_group *fsg_lun_make(struct config_group *group,
+ const char *name)
+{
+ struct fsg_lun_opts *opts;
+ struct fsg_opts *fsg_opts;
+ char buf[MAX_NAME_LEN];
+ char lun_name[MAX_LUN_NAME_LEN];
+ struct fsg_lun_config config;
+ char *num_str;
+ u8 num;
+ int ret;
+
+ ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
+ if (ret >= MAX_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ num_str = strchr(buf, '.');
+ if (!num_str) {
+ pr_err("Unable to locate . in LUN.NUMBER\n");
+ return ERR_PTR(-EINVAL);
+ }
+ *num_str = '\0';
+ num_str++;
+
+ ret = kstrtou8(num_str, 0, &num);
+ if (ret)
+ return ERR_PTR(ret);
+
+ fsg_opts = to_fsg_opts(&group->cg_item);
+ if (num >= FSG_MAX_LUNS)
+ return ERR_PTR(-ENODEV);
+ mutex_lock(&fsg_opts->lock);
+ if (fsg_opts->refcnt || fsg_opts->common->luns[num]) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ memset(&config, 0, sizeof(config));
+ config.removable = true;
+
+ snprintf(lun_name, MAX_LUN_NAME_LEN, "%s/%s",
+ group->cg_item.ci_name, name);
+ ret = fsg_common_create_lun(fsg_opts->common, &config, num, lun_name,
+ NULL);
+ if (ret) {
+ kfree(opts);
+ goto out;
+ }
+ opts->lun = fsg_opts->common->luns[num];
+ opts->lun_id = num;
+ mutex_unlock(&fsg_opts->lock);
+
+ config_group_init_type_name(&opts->group, name, &fsg_lun_type);
+
+ return &opts->group;
+out:
+ mutex_unlock(&fsg_opts->lock);
+ return ERR_PTR(ret);
+}
+
+static void fsg_lun_drop(struct config_group *group, struct config_item *item)
+{
+ struct fsg_lun_opts *lun_opts;
+ struct fsg_opts *fsg_opts;
+
+ lun_opts = to_fsg_lun_opts(item);
+ fsg_opts = to_fsg_opts(&group->cg_item);
+
+ mutex_lock(&fsg_opts->lock);
+ if (fsg_opts->refcnt) {
+ struct config_item *gadget;
+
+ gadget = group->cg_item.ci_parent->ci_parent;
+ unregister_gadget_item(gadget);
+ }
+
+ fsg_common_remove_lun(lun_opts->lun, fsg_opts->common->sysfs);
+ fsg_opts->common->luns[lun_opts->lun_id] = NULL;
+ lun_opts->lun_id = 0;
+ mutex_unlock(&fsg_opts->lock);
+
+ config_item_put(item);
+}
+
+CONFIGFS_ATTR_STRUCT(fsg_opts);
+CONFIGFS_ATTR_OPS(fsg_opts);
+
+static void fsg_attr_release(struct config_item *item)
+{
+ struct fsg_opts *opts = to_fsg_opts(item);
+
+ usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations fsg_item_ops = {
+ .release = fsg_attr_release,
+ .show_attribute = fsg_opts_attr_show,
+ .store_attribute = fsg_opts_attr_store,
+};
+
+static ssize_t fsg_opts_stall_show(struct fsg_opts *opts, char *page)
+{
+ int result;
+
+ mutex_lock(&opts->lock);
+ result = sprintf(page, "%d", opts->common->can_stall);
+ mutex_unlock(&opts->lock);
+
+ return result;
+}
+
+static ssize_t fsg_opts_stall_store(struct fsg_opts *opts, const char *page,
+ size_t len)
+{
+ int ret;
+ u8 num;
+
+ mutex_lock(&opts->lock);
+ if (opts->refcnt) {
+ ret = -EBUSY;
+ goto end;
+ }
+ ret = kstrtou8(page, 0, &num);
+ if (ret)
+ goto end;
+
+ opts->common->can_stall = num != 0;
+ ret = len;
+
+end:
+ mutex_unlock(&opts->lock);
+ return ret;
+}
+
+static struct fsg_opts_attribute fsg_opts_stall =
+ __CONFIGFS_ATTR(stall, S_IRUGO | S_IWUSR, fsg_opts_stall_show,
+ fsg_opts_stall_store);
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+static ssize_t fsg_opts_num_buffers_show(struct fsg_opts *opts, char *page)
+{
+ int result;
+
+ mutex_lock(&opts->lock);
+ result = sprintf(page, "%d", opts->common->fsg_num_buffers);
+ mutex_unlock(&opts->lock);
+
+ return result;
+}
+
+static ssize_t fsg_opts_num_buffers_store(struct fsg_opts *opts,
+ const char *page, size_t len)
+{
+ int ret;
+ u8 num;
+
+ mutex_lock(&opts->lock);
+ if (opts->refcnt) {
+ ret = -EBUSY;
+ goto end;
+ }
+ ret = kstrtou8(page, 0, &num);
+ if (ret)
+ goto end;
+
+ ret = fsg_num_buffers_validate(num);
+ if (ret)
+ goto end;
+
+ fsg_common_set_num_buffers(opts->common, num);
+ ret = len;
+
+end:
+ mutex_unlock(&opts->lock);
+ return ret;
+}
+
+static struct fsg_opts_attribute fsg_opts_num_buffers =
+ __CONFIGFS_ATTR(num_buffers, S_IRUGO | S_IWUSR,
+ fsg_opts_num_buffers_show,
+ fsg_opts_num_buffers_store);
+
+#endif
+
+static struct configfs_attribute *fsg_attrs[] = {
+ &fsg_opts_stall.attr,
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+ &fsg_opts_num_buffers.attr,
+#endif
+ NULL,
+};
+
+static struct configfs_group_operations fsg_group_ops = {
+ .make_group = fsg_lun_make,
+ .drop_item = fsg_lun_drop,
+};
+
+static struct config_item_type fsg_func_type = {
+ .ct_item_ops = &fsg_item_ops,
+ .ct_group_ops = &fsg_group_ops,
+ .ct_attrs = fsg_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
static void fsg_free_inst(struct usb_function_instance *fi)
{
struct fsg_opts *opts;
@@ -3361,11 +3706,13 @@ static void fsg_free_inst(struct usb_function_instance *fi)
static struct usb_function_instance *fsg_alloc_inst(void)
{
struct fsg_opts *opts;
+ struct fsg_lun_config config;
int ret;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
+ mutex_init(&opts->lock);
opts->func_inst.free_func_inst = fsg_free_inst;
opts->common = fsg_common_setup(opts->common, false);
if (IS_ERR(opts->common)) {
@@ -3383,6 +3730,18 @@ static struct usb_function_instance *fsg_alloc_inst(void)
pr_info(FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n");
+ memset(&config, 0, sizeof(config));
+ config.removable = true;
+ ret = fsg_common_create_lun(opts->common, &config, 0, "lun.0",
+ (const char **)&opts->func_inst.group.cg_item.ci_name);
+ opts->lun0.lun = opts->common->luns[0];
+ opts->lun0.lun_id = 0;
+ config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type);
+ opts->default_groups[0] = &opts->lun0.group;
+ opts->func_inst.group.default_groups = opts->default_groups;
+
+ config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type);
+
return &opts->func_inst;
release_luns:
@@ -3395,8 +3754,14 @@ release_opts:
static void fsg_free(struct usb_function *f)
{
struct fsg_dev *fsg;
+ struct fsg_opts *opts;
fsg = container_of(f, struct fsg_dev, function);
+ opts = container_of(f->fi, struct fsg_opts, func_inst);
+
+ mutex_lock(&opts->lock);
+ opts->refcnt--;
+ mutex_unlock(&opts->lock);
kfree(fsg);
}
@@ -3427,6 +3792,9 @@ static struct usb_function *fsg_alloc(struct usb_function_instance *fi)
if (unlikely(!fsg))
return ERR_PTR(-ENOMEM);
+ mutex_lock(&opts->lock);
+ opts->refcnt++;
+ mutex_unlock(&opts->lock);
fsg->function.name = FSG_DRIVER_DESC;
fsg->function.bind = fsg_bind;
fsg->function.unbind = fsg_unbind;
diff --git a/drivers/usb/gadget/f_mass_storage.h b/drivers/usb/gadget/f_mass_storage.h
index 7aed1d9..62b4b8f 100644
--- a/drivers/usb/gadget/f_mass_storage.h
+++ b/drivers/usb/gadget/f_mass_storage.h
@@ -71,10 +71,27 @@ struct fsg_operations {
int (*thread_exits)(struct fsg_common *common);
};
+struct fsg_lun_opts {
+ struct config_group group;
+ struct fsg_lun *lun;
+ int lun_id;
+};
+
struct fsg_opts {
struct fsg_common *common;
struct usb_function_instance func_inst;
+ struct fsg_lun_opts lun0;
+ struct config_group *default_groups[2];
bool no_configfs; /* for legacy gadgets */
+
+ /*
+ * Read/write access to configfs attributes is handled by configfs.
+ *
+ * This is to protect the data from concurrent access by read/write
+ * and create symlink/remove symlink.
+ */
+ struct mutex lock;
+ int refcnt;
};
struct fsg_lun_config {
--
1.7.0.4
--
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