diff options
Diffstat (limited to 'drivers/usb/gadget/file_storage.c')
| -rw-r--r-- | drivers/usb/gadget/file_storage.c | 38 |
1 files changed, 29 insertions, 9 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index cf3be299e353..6f887478b148 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -71,6 +71,12 @@ * 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...] @@ -108,6 +114,14 @@ * 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>. */ @@ -334,11 +348,9 @@ MODULE_LICENSE("Dual BSD/GPL"); #define MAX_LUNS 8 - /* Arggh! There should be a module_param_array_named macro! */ -static char *file[MAX_LUNS]; -static int ro[MAX_LUNS]; - static struct { + char *file[MAX_LUNS]; + int ro[MAX_LUNS]; int num_filenames; int num_ros; unsigned int nluns; @@ -370,10 +382,11 @@ static struct { }; -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); @@ -1795,6 +1808,7 @@ static int do_write(struct fsg_dev *fsg) * 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; @@ -2398,6 +2412,7 @@ static int throw_away_data(struct fsg_dev *fsg) * 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; @@ -3029,6 +3044,7 @@ static int get_next_command(struct fsg_dev *fsg) /* 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); @@ -3859,7 +3875,7 @@ static int __init fsg_bind(struct usb_gadget *gadget) 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); @@ -3876,8 +3892,9 @@ static int __init fsg_bind(struct usb_gadget *gadget) 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); @@ -3953,6 +3970,9 @@ static int __init fsg_bind(struct usb_gadget *gadget) 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) |