Re: [PATCH] Missing usb_find_device symbol from usb.c
From: Pekka J Enberg
Date: Thu Jan 24 2008 - 14:25:53 EST
Hi Greg,
On Thu, Jan 24, 2008 at 07:42:20PM +0200, Pekka Enberg wrote:
> > Yeah, that would work but why do we want to mount all devices under
> > the same mount point? If you move device discovery to ->probe() it's
> > simple to have per-device mount points by overriding ->get_sb() to
> > check for USB_DEVICE_MAJOR and look up the actual device, no?
> > Otherwise you have to deal with device plug/unplug at filesystem
> > level...
On Thu, 24 Jan 2008, Greg KH wrote:
> Yes, you could do that (per device mount), but it might be confusing for
> users to have to control things that way.
Well, that's how it works for all other music players (especially ones
that support USB storage natively). But anyway, here's a skeleton driver
for what I was proposing in case someone is interested.
Pekka
---
drivers/usb/misc/Kconfig | 6
drivers/usb/misc/Makefile | 1
drivers/usb/misc/iriver.c | 312 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 319 insertions(+)
Index: linux-2.6/drivers/usb/misc/iriver.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6/drivers/usb/misc/iriver.c 2008-01-24 21:15:07.000000000 +0200
@@ -0,0 +1,312 @@
+#include <linux/kref.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/usb.h>
+
+#define USB_IRIVER_MINOR_BASE 128 /* FIXME: ask for one */
+
+#define IRIVER_VENDOR_ID 0x4102
+
+static struct usb_device_id iriver_table[] = {
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1001) },
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1003) },
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1005) },
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1007) },
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1008) },
+ { USB_DEVICE(IRIVER_VENDOR_ID, 0x1010) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, iriver_table);
+
+struct iriver_device {
+ struct usb_device *udev;
+ struct usb_interface *interface;
+ unsigned char *bulk_in_buffer;
+ size_t bulk_in_size;
+ __u8 bulk_in_endpoint_addr;
+ __u8 bulk_out_endpoint_addr;
+ struct mutex mutex;
+ struct kref kref;
+};
+#define to_iriver_dev(d) container_of(d, struct iriver_device, kref)
+
+static struct usb_class_driver iriver_class = {
+ .name = "iriver%d",
+ .minor_base = USB_IRIVER_MINOR_BASE,
+};
+
+static void iriver_delete(struct kref *kref)
+{
+ struct iriver_device *dev = to_iriver_dev(kref);
+
+ usb_put_dev(dev->udev);
+ kfree(dev);
+}
+
+static void iriver_disconnect(struct usb_interface *interface)
+{
+ struct iriver_device *dev;
+
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ usb_deregister_dev(interface, &iriver_class);
+ kref_put(&dev->kref, iriver_delete);
+}
+
+static int iriver_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_host_interface *iface_desc;
+ struct iriver_device *dev;
+ int i, err;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+ kref_init(&dev->kref);
+ mutex_init(&dev->mutex);
+
+ dev->udev = usb_get_dev(interface_to_usbdev(interface));
+ dev->interface = interface;
+
+ iface_desc = interface->cur_altsetting;
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ struct usb_endpoint_descriptor *endpoint;
+
+ endpoint = &iface_desc->endpoint[i].desc;
+
+ if (!dev->bulk_in_endpoint_addr &&
+ usb_endpoint_is_bulk_in(endpoint)) {
+ size_t buffer_size;
+
+ buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+ dev->bulk_in_size = buffer_size;
+ dev->bulk_in_endpoint_addr = endpoint->bEndpointAddress;
+ dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
+ if (!dev->bulk_in_buffer) {
+ err = -ENOMEM;
+ goto failed;
+ }
+ }
+
+ if (!dev->bulk_out_endpoint_addr &&
+ usb_endpoint_is_bulk_out(endpoint))
+ dev->bulk_out_endpoint_addr = endpoint->bEndpointAddress;
+ }
+ if (!dev->bulk_in_endpoint_addr || !dev->bulk_out_endpoint_addr) {
+ err = -EINVAL;
+ goto failed;
+ }
+ usb_set_intfdata(interface, dev);
+
+ err = usb_register_dev(interface, &iriver_class);
+ if (err) {
+ usb_set_intfdata(interface, NULL);
+ goto failed;
+ }
+ return 0;
+failed:
+ if (dev)
+ kref_put(&dev->kref, iriver_delete);
+ return err;
+}
+
+static struct usb_driver iriver_driver = {
+ .name = "iriver",
+ .probe = iriver_probe,
+ .disconnect = iriver_disconnect,
+ .id_table = iriver_table,
+};
+
+#define IRIVERFS_MAGIC 0xdeadbeef
+#define IRIVERFS_BLOCK_SIZE 512
+#define IRIVERFS_BLOCK_BITS 9
+
+static int iriver_set_super(struct super_block *sb, void *data)
+{
+ sb->s_fs_info = data;
+ return set_anon_super(sb, data);
+}
+
+static struct iriver_device *iriver_sb_info(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+static void iriver_kill_sb(struct super_block *sb)
+{
+ generic_shutdown_super(sb);
+}
+
+static int iriverfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct super_block *sb = dentry->d_sb;
+ struct iriver_device *dev;
+
+ dev = iriver_sb_info(sb);
+ mutex_lock(&dev->mutex);
+ /*
+ * TODO: Fill in the blank.
+ */
+ mutex_unlock(&dev->mutex);
+ return dcache_readdir(file, dirent, filldir);
+}
+
+static struct file_operations iriverfs_dir_ops = {
+ .open = dcache_dir_open,
+ .release = dcache_dir_close,
+ .read = generic_read_dir,
+ .readdir = iriverfs_readdir,
+};
+
+static struct dentry *iriverfs_lookup(struct inode *dir,
+ struct dentry *dentry,
+ struct nameidata *nd)
+{
+ return NULL;
+}
+
+static struct inode_operations iriverfs_dir_inode_ops = {
+ .lookup = iriverfs_lookup,
+};
+
+static struct inode *iriver_get_inode(struct super_block *sb, int mode)
+{
+ struct inode *inode = new_inode(sb);
+ if (inode) {
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ inode->i_op = &iriverfs_dir_inode_ops;
+ inode->i_fop = &iriverfs_dir_ops;
+ break;
+ default:
+ BUG();
+ }
+ }
+ return inode;
+}
+
+static const struct super_operations iriverfs_ops = {
+ .drop_inode = generic_delete_inode,
+};
+
+static int iriver_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct dentry *root;
+ struct inode *inode;
+ int err;
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = IRIVERFS_BLOCK_SIZE;
+ sb->s_blocksize_bits = IRIVERFS_BLOCK_BITS;
+ sb->s_magic = IRIVERFS_MAGIC;
+ sb->s_op = &iriverfs_ops;
+
+ inode = iriver_get_inode(sb, S_IFDIR | 0755);
+ if (!inode)
+ return -ENOMEM;
+
+ root = d_alloc_root(inode);
+ if (!root) {
+ iput(inode);
+ err = -ENOMEM;
+ }
+ sb->s_root = root;
+
+ return 0;
+}
+
+static int iriver_get_sb(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ struct usb_interface *interface;
+ struct iriver_device *dev;
+ struct super_block *sb;
+ struct nameidata nd;
+ unsigned minor;
+ int err;
+
+ if (!dev_name)
+ return -EINVAL;
+
+ err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
+ if (err)
+ return err;
+
+ if (nd.mnt->mnt_flags & MNT_NODEV) {
+ err = -EACCES;
+ goto error;
+ }
+ if (imajor(nd.dentry->d_inode) != USB_DEVICE_MAJOR) {
+ err = -EINVAL;
+ goto error;
+ }
+ minor = iminor(nd.dentry->d_inode);
+ path_release(&nd);
+ interface = usb_find_interface(&iriver_driver, minor);
+ if (!interface) {
+ err = -ENODEV;
+ goto error;
+ }
+ dev = usb_get_intfdata(interface);
+ sb = sget(fs_type, NULL, iriver_set_super, dev);
+ if (IS_ERR(sb)) {
+ err = PTR_ERR(sb);
+ goto error;
+ }
+ if (sb->s_root) {
+ err = -EBUSY;
+ goto error;
+ }
+ sb->s_flags = flags;
+ err = iriver_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
+ if (err) {
+ up_write(&sb->s_umount);
+ deactivate_super(sb);
+ goto error;
+ }
+ sb->s_flags |= MS_ACTIVE;
+ return simple_set_mnt(mnt, sb);
+error:
+ path_release(&nd);
+ return err;
+}
+
+static struct file_system_type iriverfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "iriverfs",
+ .get_sb = iriver_get_sb,
+ .kill_sb = iriver_kill_sb,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static int __init iriver_init(void)
+{
+ int err;
+
+ err = usb_register(&iriver_driver);
+ if (err)
+ return err;
+
+ err = register_filesystem(&iriverfs_fs_type);
+ if (err) {
+ usb_deregister(&iriver_driver);
+ return err;
+ }
+ return 0;
+}
+
+static void __exit iriver_exit(void)
+{
+ unregister_filesystem(&iriverfs_fs_type);
+ usb_deregister(&iriver_driver);
+}
+
+module_init(iriver_init);
+module_exit(iriver_exit);
+
+MODULE_LICENSE("GPL");
Index: linux-2.6/drivers/usb/misc/Kconfig
===================================================================
--- linux-2.6.orig/drivers/usb/misc/Kconfig 2008-01-24 21:15:14.000000000 +0200
+++ linux-2.6/drivers/usb/misc/Kconfig 2008-01-24 21:16:22.000000000 +0200
@@ -269,3 +269,9 @@
See <http://www.linux-usb.org/usbtest/> for more information,
including sample test device firmware and "how to use it".
+config USB_IRIVER
+ tristate "iRiver iFP portable music player driver (DEVELOPMENT)"
+ depends on USB && EXPERIMENTAL
+ help
+ This is a driver for the iRiver iFP portable music player.
+
Index: linux-2.6/drivers/usb/misc/Makefile
===================================================================
--- linux-2.6.orig/drivers/usb/misc/Makefile 2008-01-24 21:16:33.000000000 +0200
+++ linux-2.6/drivers/usb/misc/Makefile 2008-01-24 21:16:46.000000000 +0200
@@ -26,6 +26,7 @@
obj-$(CONFIG_USB_TEST) += usbtest.o
obj-$(CONFIG_USB_TRANCEVIBRATOR) += trancevibrator.o
obj-$(CONFIG_USB_USS720) += uss720.o
+obj-$(CONFIG_IRIVER) += iriver.o
obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/
--
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