USB: android: Add a new LUN as CD-ROM in mass-storage
Add a new LUN(lun0) which will be exposed as a CD-ROM having the
attributes ro(read-only) & removable as enabled.
This CD-ROM lun is used for saving read-only files which can be used
for system requirements.
Change-Id: Idff5aea8bce233e8b77a4b689323a2f1eb2523e1
Signed-off-by: Rajkumar Raghupathy <raghup@codeaurora.org>
diff --git a/drivers/usb/gadget/android.c b/drivers/usb/gadget/android.c
index a13b5da..2ed642a 100644
--- a/drivers/usb/gadget/android.c
+++ b/drivers/usb/gadget/android.c
@@ -1065,9 +1065,12 @@
static int mass_storage_function_init(struct android_usb_function *f,
struct usb_composite_dev *cdev)
{
+ struct android_dev *dev = _android_dev;
struct mass_storage_function_config *config;
struct fsg_common *common;
int err;
+ int i;
+ const char *name[2];
config = kzalloc(sizeof(struct mass_storage_function_config),
GFP_KERNEL);
@@ -1075,6 +1078,15 @@
return -ENOMEM;
config->fsg.nluns = 1;
+ name[0] = "lun";
+ if (dev->pdata->cdrom) {
+ config->fsg.nluns = 2;
+ config->fsg.luns[1].cdrom = 1;
+ config->fsg.luns[1].ro = 1;
+ config->fsg.luns[1].removable = 1;
+ name[1] = "lun0";
+ }
+
config->fsg.luns[0].removable = 1;
common = fsg_common_init(NULL, cdev, &config->fsg);
@@ -1083,18 +1095,24 @@
return PTR_ERR(common);
}
- err = sysfs_create_link(&f->dev->kobj,
- &common->luns[0].dev.kobj,
- "lun");
- if (err) {
- fsg_common_release(&common->ref);
- kfree(config);
- return err;
+ for (i = 0; i < config->fsg.nluns; i++) {
+ err = sysfs_create_link(&f->dev->kobj,
+ &common->luns[i].dev.kobj,
+ name[i]);
+ if (err)
+ goto error;
}
config->common = common;
f->config = config;
return 0;
+error:
+ for (; i > 0 ; i--)
+ sysfs_remove_link(&f->dev->kobj, name[i-1]);
+
+ fsg_common_release(&common->ref);
+ kfree(config);
+ return err;
}
static void mass_storage_function_cleanup(struct android_usb_function *f)