* requirement amounts to two 16K buffers, size configurable by a parameter.
* Support is included for both full-speed and high-speed operation.
*
+ * Note that the driver is slightly non-portable in that it assumes a
+ * single memory/DMA buffer will be useable for bulk-in, bulk-out, and
+ * interrupt-in endpoints. With most device controllers this isn't an
+ * issue, but there may be some with hardware restrictions that prevent
+ * a buffer from being used by more than one endpoint.
+ *
* Module options:
*
* file=filename[,filename...]
* setting are not allowed when the medium is loaded.
*
* This gadget driver is heavily based on "Gadget Zero" by David Brownell.
+ * The driver's SCSI command interface was based on the "Information
+ * technology - Small Computer System Interface - 2" document from
+ * X3T9.2 Project 375D, Revision 10L, 7-SEP-93, available at
+ * <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>. The single exception
+ * is opcode 0x23 (READ FORMAT CAPACITIES), which was based on the
+ * "Universal Serial Bus Mass Storage Class UFI Command Specification"
+ * document, Revision 1.0, December 14, 1998, available at
+ * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
*/
#include <linux/string.h>
#include <linux/suspend.h>
#include <linux/utsname.h>
-#include <linux/wait.h>
#include <linux/usb_ch9.h>
#include <linux/usb_gadget.h>
#define DRIVER_DESC "File-backed Storage Gadget"
#define DRIVER_NAME "g_file_storage"
-#define DRIVER_VERSION "20 October 2004"
+#define DRIVER_VERSION "28 November 2005"
static const char longname[] = DRIVER_DESC;
static const char shortname[] = DRIVER_NAME;
#define MAX_LUNS 8
- /* Arggh! There should be a module_param_array_named macro! */
-static char *file[MAX_LUNS] = {NULL, };
-static int ro[MAX_LUNS] = {0, };
-
static struct {
+ char *file[MAX_LUNS];
+ int ro[MAX_LUNS];
int num_filenames;
int num_ros;
unsigned int nluns;
};
-module_param_array(file, charp, &mod_data.num_filenames, S_IRUGO);
+module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
+ S_IRUGO);
MODULE_PARM_DESC(file, "names of backing files or devices");
-module_param_array(ro, bool, &mod_data.num_ros, S_IRUGO);
+module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
MODULE_PARM_DESC(ro, "true to force read-only");
module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
struct fsg_buffhd {
void *buf;
dma_addr_t dma;
- volatile enum fsg_buffer_state state;
+ enum fsg_buffer_state state;
struct fsg_buffhd *next;
/* The NetChip 2280 is faster, and handles some protocol faults
unsigned int bulk_out_intended_length;
struct usb_request *inreq;
- volatile int inreq_busy;
+ int inreq_busy;
struct usb_request *outreq;
- volatile int outreq_busy;
+ int outreq_busy;
};
enum fsg_state {
struct usb_ep *ep0; // Handy copy of gadget->ep0
struct usb_request *ep0req; // For control responses
- volatile unsigned int ep0_req_tag;
+ unsigned int ep0_req_tag;
const char *ep0req_name;
struct usb_request *intreq; // For interrupt responses
- volatile int intreq_busy;
+ int intreq_busy;
struct fsg_buffhd *intr_buffhd;
unsigned int bulk_out_maxpacket;
struct fsg_buffhd *next_buffhd_to_drain;
struct fsg_buffhd buffhds[NUM_BUFFERS];
- wait_queue_head_t thread_wqh;
int thread_wakeup_needed;
struct completion thread_notifier;
struct task_struct *thread_task;
/* These routines may be called in process context or in_irq */
+/* Caller must hold fsg->lock */
static void wakeup_thread(struct fsg_dev *fsg)
{
/* Tell the main thread that something has happened */
fsg->thread_wakeup_needed = 1;
- wake_up_all(&fsg->thread_wqh);
+ if (fsg->thread_task)
+ wake_up_process(fsg->thread_task);
}
usb_ep_fifo_flush(ep);
/* Hold the lock while we update the request and buffer states */
+ smp_wmb();
spin_lock(&fsg->lock);
bh->inreq_busy = 0;
bh->state = BUF_STATE_EMPTY;
- spin_unlock(&fsg->lock);
wakeup_thread(fsg);
+ spin_unlock(&fsg->lock);
}
static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
usb_ep_fifo_flush(ep);
/* Hold the lock while we update the request and buffer states */
+ smp_wmb();
spin_lock(&fsg->lock);
bh->outreq_busy = 0;
bh->state = BUF_STATE_FULL;
- spin_unlock(&fsg->lock);
wakeup_thread(fsg);
+ spin_unlock(&fsg->lock);
}
usb_ep_fifo_flush(ep);
/* Hold the lock while we update the request and buffer states */
+ smp_wmb();
spin_lock(&fsg->lock);
fsg->intreq_busy = 0;
bh->state = BUF_STATE_EMPTY;
- spin_unlock(&fsg->lock);
wakeup_thread(fsg);
+ spin_unlock(&fsg->lock);
}
#else
fsg->cbbuf_cmnd_size = req->actual;
memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size);
- spin_unlock(&fsg->lock);
wakeup_thread(fsg);
+ spin_unlock(&fsg->lock);
}
#else
/* Use this for bulk or interrupt transfers, not ep0 */
static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
- struct usb_request *req, volatile int *pbusy,
- volatile enum fsg_buffer_state *state)
+ struct usb_request *req, int *pbusy,
+ enum fsg_buffer_state *state)
{
int rc;
dump_msg(fsg, "bulk-in", req->buf, req->length);
else if (ep == fsg->intr_in)
dump_msg(fsg, "intr-in", req->buf, req->length);
+
+ spin_lock_irq(&fsg->lock);
*pbusy = 1;
*state = BUF_STATE_BUSY;
+ spin_unlock_irq(&fsg->lock);
rc = usb_ep_queue(ep, req, GFP_KERNEL);
if (rc != 0) {
*pbusy = 0;
static int sleep_thread(struct fsg_dev *fsg)
{
- int rc;
+ int rc = 0;
/* Wait until a signal arrives or we are woken up */
- rc = wait_event_interruptible(fsg->thread_wqh,
- fsg->thread_wakeup_needed);
+ for (;;) {
+ try_to_freeze();
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+ if (fsg->thread_wakeup_needed)
+ break;
+ schedule();
+ }
+ __set_current_state(TASK_RUNNING);
fsg->thread_wakeup_needed = 0;
- try_to_freeze();
- return (rc ? -EINTR : 0);
+ return rc;
}
* the bulk-out maxpacket size */
bh->outreq->length = bh->bulk_out_intended_length =
amount;
+ bh->outreq->short_not_ok = 1;
start_transfer(fsg, fsg->bulk_out, bh->outreq,
&bh->outreq_busy, &bh->state);
fsg->next_buffhd_to_fill = bh->next;
if (bh->state == BUF_STATE_EMPTY && !get_some_more)
break; // We stopped early
if (bh->state == BUF_STATE_FULL) {
+ smp_rmb();
fsg->next_buffhd_to_drain = bh->next;
bh->state = BUF_STATE_EMPTY;
return -EINVAL;
inode = filp->f_dentry->d_inode;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
current->flags |= PF_SYNCWRITE;
rc = filemap_fdatawrite(inode->i_mapping);
err = filp->f_op->fsync(filp, filp->f_dentry, 1);
if (!rc)
rc = err;
current->flags &= ~PF_SYNCWRITE;
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
VLDBG(curlun, "fdatasync -> %d\n", rc);
return rc;
}
/* Throw away the data in a filled buffer */
if (bh->state == BUF_STATE_FULL) {
+ smp_rmb();
bh->state = BUF_STATE_EMPTY;
fsg->next_buffhd_to_drain = bh->next;
* the bulk-out maxpacket size */
bh->outreq->length = bh->bulk_out_intended_length =
amount;
+ bh->outreq->short_not_ok = 1;
start_transfer(fsg, fsg->bulk_out, bh->outreq,
&bh->outreq_busy, &bh->state);
fsg->next_buffhd_to_fill = bh->next;
/* Queue a request to read a Bulk-only CBW */
set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN);
+ bh->outreq->short_not_ok = 1;
start_transfer(fsg, fsg->bulk_out, bh->outreq,
&bh->outreq_busy, &bh->state);
if ((rc = sleep_thread(fsg)) != 0)
return rc;
}
+ smp_rmb();
rc = received_cbw(fsg, bh);
bh->state = BUF_STATE_EMPTY;
kref_put(&fsg->ref, fsg_release);
}
-static void fsg_unbind(struct usb_gadget *gadget)
+static void __exit fsg_unbind(struct usb_gadget *gadget)
{
struct fsg_dev *fsg = get_gadget_data(gadget);
int i;
for (i = 0; i < fsg->nluns; ++i) {
curlun = &fsg->luns[i];
- curlun->ro = ro[i];
+ curlun->ro = mod_data.ro[i];
curlun->dev.parent = &gadget->dev;
curlun->dev.driver = &fsg_driver.driver;
dev_set_drvdata(&curlun->dev, fsg);
kref_get(&fsg->ref);
}
- if (file[i] && *file[i]) {
- if ((rc = open_backing_file(curlun, file[i])) != 0)
+ if (mod_data.file[i] && *mod_data.file[i]) {
+ if ((rc = open_backing_file(curlun,
+ mod_data.file[i])) != 0)
goto out;
} else if (!mod_data.removable) {
ERROR(fsg, "no file given for LUN%d\n", i);
for (i = 0; i < NUM_BUFFERS; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
+ /* Allocate for the bulk-in endpoint. We assume that
+ * the buffer will also work with the bulk-out (and
+ * interrupt-in) endpoint. */
bh->buf = usb_ep_alloc_buffer(fsg->bulk_in, mod_data.buflen,
&bh->dma, GFP_KERNEL);
if (!bh->buf)
#endif
.function = (char *) longname,
.bind = fsg_bind,
- .unbind = fsg_unbind,
+ .unbind = __exit_p(fsg_unbind),
.disconnect = fsg_disconnect,
.setup = fsg_setup,
.suspend = fsg_suspend,
spin_lock_init(&fsg->lock);
init_rwsem(&fsg->filesem);
kref_init(&fsg->ref);
- init_waitqueue_head(&fsg->thread_wqh);
init_completion(&fsg->thread_notifier);
the_fsg = fsg;
git.openpandora.org / pandora-kernel.git / blobdiff