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USB: g_mass_storage: fsg_config added & module params handlig changed
Removed all references to mod_data in f_mass_storage.c and instead created fsg_config structure fsg_common_init() takes as an argument -- it stores all configuration options that were previously taken from mod_data. Moreover, The fsg_config structure allows per-LUN configuration of removable and CD-ROM emulation. Module parameters are handled by defining an object of fsg_module_parameters structure and then declaring module parameters via FSG_MODULE_PARAMETERS() macro. It adds proper declarations to the code making specified object be populated from module parameters. To use values stored there one may use either fsg_config_from_params() which will will a fsg_config structure with values taken from fsg_module_parameters structure or fsg_common_from_params() which will initialise fsg_common structure directly. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michal Nazarewicz
Greg Kroah-Hartman
parent
d23b0f08d1
commit
481e49296a
@ -253,51 +253,6 @@ static const char fsg_string_interface[] = "Mass Storage";
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/*-------------------------------------------------------------------------*/
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/* Encapsulate the module parameter settings */
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static struct {
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char *file[FSG_MAX_LUNS];
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int ro[FSG_MAX_LUNS];
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unsigned int num_filenames;
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unsigned int num_ros;
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unsigned int nluns;
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int removable;
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int can_stall;
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int cdrom;
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unsigned short release;
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} mod_data = { // Default values
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.removable = 0,
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.can_stall = 1,
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.cdrom = 0,
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.release = 0xffff,
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};
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module_param_array_named(file, mod_data.file, charp, &mod_data.num_filenames,
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S_IRUGO);
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MODULE_PARM_DESC(file, "names of backing files or devices");
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module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
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MODULE_PARM_DESC(ro, "true to force read-only");
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module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
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MODULE_PARM_DESC(luns, "number of LUNs");
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module_param_named(removable, mod_data.removable, bool, S_IRUGO);
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MODULE_PARM_DESC(removable, "true to simulate removable media");
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module_param_named(stall, mod_data.can_stall, bool, S_IRUGO);
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MODULE_PARM_DESC(stall, "false to prevent bulk stalls");
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module_param_named(cdrom, mod_data.cdrom, bool, S_IRUGO);
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MODULE_PARM_DESC(cdrom, "true to emulate cdrom instead of disk");
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/*-------------------------------------------------------------------------*/
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/* Data shared by all the FSG instances. */
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struct fsg_common {
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struct usb_gadget *gadget;
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@ -317,12 +272,34 @@ struct fsg_common {
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struct fsg_lun *luns;
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struct fsg_lun *curlun;
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unsigned int can_stall:1;
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unsigned int free_storage_on_release:1;
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/* Vendor (8 chars), product (16 chars), release (4
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* hexadecimal digits) and NUL byte */
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char inquiry_string[8 + 16 + 4 + 1];
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struct kref ref;
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};
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struct fsg_config {
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unsigned nluns;
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struct fsg_lun_config {
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const char *filename;
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char ro;
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char removable;
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char cdrom;
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} luns[FSG_MAX_LUNS];
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const char *vendor_name; /* 8 characters or less */
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const char *product_name; /* 16 characters or less */
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u16 release;
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char can_stall;
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};
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struct fsg_dev {
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struct usb_function function;
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struct usb_composite_dev*cdev;
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@ -351,6 +328,7 @@ struct fsg_dev {
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unsigned int phase_error : 1;
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unsigned int short_packet_received : 1;
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unsigned int bad_lun_okay : 1;
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unsigned int can_stall : 1;
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unsigned long atomic_bitflags;
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#define REGISTERED 0
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@ -1065,13 +1043,10 @@ static int do_verify(struct fsg_dev *fsg)
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static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
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{
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struct fsg_lun *curlun = fsg->common->curlun;
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u8 *buf = (u8 *) bh->buf;
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static char vendor_id[] = "Linux ";
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static char product_disk_id[] = "File-Stor Gadget";
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static char product_cdrom_id[] = "File-CD Gadget ";
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if (!fsg->common->curlun) { // Unsupported LUNs are okay
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if (!curlun) { /* Unsupported LUNs are okay */
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fsg->bad_lun_okay = 1;
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memset(buf, 0, 36);
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buf[0] = 0x7f; // Unsupported, no device-type
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@ -1079,18 +1054,16 @@ static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh)
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return 36;
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}
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memset(buf, 0, 8);
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buf[0] = (mod_data.cdrom ? TYPE_CDROM : TYPE_DISK);
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if (mod_data.removable)
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buf[1] = 0x80;
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buf[0] = curlun->cdrom ? TYPE_CDROM : TYPE_DISK;
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buf[1] = curlun->removable ? 0x80 : 0;
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buf[2] = 2; // ANSI SCSI level 2
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buf[3] = 2; // SCSI-2 INQUIRY data format
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buf[4] = 31; // Additional length
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// No special options
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sprintf(buf + 8, "%-8s%-16s%04x", vendor_id,
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(mod_data.cdrom ? product_cdrom_id :
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product_disk_id),
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mod_data.release);
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buf[5] = 0; // No special options
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buf[6] = 0;
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buf[7] = 0;
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memcpy(buf + 8, fsg->common->inquiry_string,
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sizeof fsg->common->inquiry_string);
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return 36;
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}
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@ -1303,7 +1276,9 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
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static int do_start_stop(struct fsg_dev *fsg)
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{
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if (!mod_data.removable) {
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if (!fsg->common->curlun) {
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return -EINVAL;
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} else if (!fsg->common->curlun->removable) {
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fsg->common->curlun->sense_data = SS_INVALID_COMMAND;
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return -EINVAL;
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}
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@ -1316,8 +1291,10 @@ static int do_prevent_allow(struct fsg_dev *fsg)
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struct fsg_lun *curlun = fsg->common->curlun;
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int prevent;
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if (!mod_data.removable) {
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curlun->sense_data = SS_INVALID_COMMAND;
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if (!fsg->common->curlun) {
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return -EINVAL;
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} else if (!fsg->common->curlun->removable) {
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fsg->common->curlun->sense_data = SS_INVALID_COMMAND;
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return -EINVAL;
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}
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@ -1505,7 +1482,7 @@ static int finish_reply(struct fsg_dev *fsg)
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* try to send or receive any data. So stall both bulk pipes
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* if we can and wait for a reset. */
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case DATA_DIR_UNKNOWN:
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if (mod_data.can_stall) {
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if (fsg->can_stall) {
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fsg_set_halt(fsg, fsg->bulk_out);
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rc = halt_bulk_in_endpoint(fsg);
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}
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@ -1526,7 +1503,7 @@ static int finish_reply(struct fsg_dev *fsg)
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/* For Bulk-only, if we're allowed to stall then send the
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* short packet and halt the bulk-in endpoint. If we can't
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* stall, pad out the remaining data with 0's. */
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} else if (mod_data.can_stall) {
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} else if (fsg->can_stall) {
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bh->inreq->zero = 1;
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start_transfer(fsg, fsg->bulk_in, bh->inreq,
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&bh->inreq_busy, &bh->state);
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@ -1556,7 +1533,7 @@ static int finish_reply(struct fsg_dev *fsg)
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* STALL. Not realizing the endpoint was halted, it wouldn't
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* clear the halt -- leading to problems later on. */
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#if 0
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else if (mod_data.can_stall) {
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else if (fsg->can_stall) {
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fsg_set_halt(fsg, fsg->bulk_out);
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raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT);
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rc = -EINTR;
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@ -1866,7 +1843,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
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break;
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case SC_READ_HEADER:
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if (!mod_data.cdrom)
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if (!fsg->common->curlun || !fsg->common->curlun->cdrom)
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goto unknown_cmnd;
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fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->common->cmnd[7]);
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if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
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@ -1876,7 +1853,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
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break;
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case SC_READ_TOC:
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if (!mod_data.cdrom)
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if (!fsg->common->curlun || !fsg->common->curlun->cdrom)
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goto unknown_cmnd;
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fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->common->cmnd[7]);
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if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
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@ -2043,7 +2020,7 @@ static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
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/* We can do anything we want here, so let's stall the
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* bulk pipes if we are allowed to. */
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if (mod_data.can_stall) {
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if (fsg->can_stall) {
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fsg_set_halt(fsg, fsg->bulk_out);
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halt_bulk_in_endpoint(fsg);
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}
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@ -2499,18 +2476,18 @@ static inline void fsg_common_put(struct fsg_common *common)
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static struct fsg_common *fsg_common_init(struct fsg_common *common,
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struct usb_composite_dev *cdev)
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struct usb_composite_dev *cdev,
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struct fsg_config *cfg)
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{
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struct usb_gadget *gadget = cdev->gadget;
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struct fsg_buffhd *bh;
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struct fsg_lun *curlun;
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struct fsg_lun_config *lcfg;
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int nluns, i, rc;
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char *pathbuf;
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/* Find out how many LUNs there should be */
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nluns = mod_data.nluns;
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if (nluns == 0)
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nluns = max(mod_data.num_filenames, 1u);
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nluns = cfg->nluns;
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if (nluns < 1 || nluns > FSG_MAX_LUNS) {
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dev_err(&gadget->dev, "invalid number of LUNs: %u\n", nluns);
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return ERR_PTR(-EINVAL);
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@ -2539,10 +2516,10 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
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init_rwsem(&common->filesem);
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for (i = 0; i < nluns; ++i, ++curlun) {
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curlun->cdrom = !!mod_data.cdrom;
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curlun->ro = mod_data.cdrom || mod_data.ro[i];
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curlun->removable = mod_data.removable;
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for (i = 0, lcfg = cfg->luns; i < nluns; ++i, ++curlun, ++lcfg) {
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curlun->cdrom = !!lcfg->cdrom;
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curlun->ro = lcfg->cdrom || lcfg->ro;
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curlun->removable = lcfg->removable;
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curlun->dev.release = fsg_lun_release;
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curlun->dev.parent = &gadget->dev;
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/* curlun->dev.driver = &fsg_driver.driver; XXX */
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@ -2564,11 +2541,11 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
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if (rc)
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goto error_luns;
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if (mod_data.file[i] && *mod_data.file[i]) {
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rc = fsg_lun_open(curlun, mod_data.file[i]);
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if (lcfg->filename) {
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rc = fsg_lun_open(curlun, lcfg->filename);
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if (rc)
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goto error_luns;
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} else if (!mod_data.removable) {
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} else if (!curlun->removable) {
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ERROR(common, "no file given for LUN%d\n", i);
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rc = -EINVAL;
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goto error_luns;
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@ -2588,33 +2565,40 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
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bh->next = common->buffhds;
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/* Release */
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if (mod_data.release == 0xffff) { // Parameter wasn't set
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int gcnum;
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/* Prepare inquiryString */
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if (cfg->release != 0xffff) {
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i = cfg->release;
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} else {
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/* The sa1100 controller is not supported */
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if (gadget_is_sa1100(gadget))
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gcnum = -1;
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else
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gcnum = usb_gadget_controller_number(gadget);
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if (gcnum >= 0)
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mod_data.release = 0x0300 + gcnum;
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else {
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i = gadget_is_sa1100(gadget)
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? -1
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: usb_gadget_controller_number(gadget);
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if (i >= 0) {
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i = 0x0300 + i;
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} else {
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WARNING(common, "controller '%s' not recognized\n",
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gadget->name);
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WARNING(common, "controller '%s' not recognized\n",
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gadget->name);
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mod_data.release = 0x0399;
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i = 0x0399;
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}
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}
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#define OR(x, y) ((x) ? (x) : (y))
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snprintf(common->inquiry_string, sizeof common->inquiry_string,
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"%-8s%-16s%04x",
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OR(cfg->vendor_name, "Linux "),
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/* Assume product name dependent on the first LUN */
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OR(cfg->product_name, common->luns->cdrom
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? "File-Stor Gadget"
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: "File-CD Gadget "),
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i);
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#undef OR
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/* Some peripheral controllers are known not to be able to
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* halt bulk endpoints correctly. If one of them is present,
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* disable stalls.
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*/
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if (gadget_is_sh(fsg->gadget) || gadget_is_at91(fsg->gadget))
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mod_data.can_stall = 0;
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common->can_stall = cfg->can_stall &&
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!(gadget_is_sh(fsg->gadget) || gadget_is_at91(fsg->gadget));
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kref_init(&common->ref);
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@ -2820,6 +2804,7 @@ static int fsg_add(struct usb_composite_dev *cdev,
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* from this function. So instead of incrementing counter now
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* and decrement in error recovery we increment it only when
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* call to usb_add_function() was successful. */
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fsg->can_stall = common->can_stall;
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rc = usb_add_function(c, &fsg->function);
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@ -2830,3 +2815,95 @@ static int fsg_add(struct usb_composite_dev *cdev,
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return rc;
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}
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/************************* Module parameters *************************/
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struct fsg_module_parameters {
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char *file[FSG_MAX_LUNS];
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int ro[FSG_MAX_LUNS];
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int removable[FSG_MAX_LUNS];
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int cdrom[FSG_MAX_LUNS];
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unsigned int file_count, ro_count, removable_count, cdrom_count;
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unsigned int luns; /* nluns */
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int stall; /* can_stall */
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};
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#define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc) \
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module_param_array_named(prefix ## name, params.name, type, \
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&prefix ## params.name ## _count, \
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S_IRUGO); \
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MODULE_PARM_DESC(prefix ## name, desc)
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#define _FSG_MODULE_PARAM(prefix, params, name, type, desc) \
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module_param_named(prefix ## name, params.name, type, \
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S_IRUGO); \
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MODULE_PARM_DESC(prefix ## name, desc)
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#define FSG_MODULE_PARAMETERS(prefix, params) \
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_FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp, \
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"names of backing files or devices"); \
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_FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool, \
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"true to force read-only"); \
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_FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool, \
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"true to simulate removable media"); \
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_FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool, \
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"true to simulate CD-ROM instead of disk"); \
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_FSG_MODULE_PARAM(prefix, params, luns, uint, \
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"number of LUNs"); \
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_FSG_MODULE_PARAM(prefix, params, stall, bool, \
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"false to prevent bulk stalls")
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static void
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fsg_config_from_params(struct fsg_config *cfg,
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const struct fsg_module_parameters *params)
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{
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struct fsg_lun_config *lun;
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unsigned i, nluns;
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/* Configure LUNs */
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nluns = cfg->nluns = !params->luns
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? params->file_count ? params->file_count : 1
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: params->luns;
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for (i = 0, lun = cfg->luns;
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i < FSG_MAX_LUNS && i < nluns;
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++i, ++lun) {
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lun->ro = !!params->ro[i];
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lun->cdrom = !!params->cdrom[i];
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lun->removable =
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params->removable_count <= i || params->removable[i];
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lun->filename =
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params->file_count > i && params->file[i][0]
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? params->file[i]
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: 0;
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}
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/* Let FSG use defaults */
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cfg->vendor_name = 0;
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cfg->product_name = 0;
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cfg->release = 0xffff;
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/* Finalise */
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cfg->can_stall = params->stall;
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}
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static inline struct fsg_common *
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fsg_common_from_params(struct fsg_common *common,
|
||||
struct usb_composite_dev *cdev,
|
||||
const struct fsg_module_parameters *params)
|
||||
__attribute__((unused));
|
||||
static inline struct fsg_common *
|
||||
fsg_common_from_params(struct fsg_common *common,
|
||||
struct usb_composite_dev *cdev,
|
||||
const struct fsg_module_parameters *params)
|
||||
{
|
||||
struct fsg_config cfg;
|
||||
fsg_config_from_params(&cfg, params);
|
||||
return fsg_common_init(common, cdev, &cfg);
|
||||
}
|
||||
|
||||
|
||||
@ -127,6 +127,11 @@ static struct usb_gadget_strings *dev_strings[] = {
|
||||
|
||||
/****************************** Configurations ******************************/
|
||||
|
||||
static struct fsg_module_parameters mod_data = {
|
||||
.stall = 1
|
||||
};
|
||||
FSG_MODULE_PARAMETERS(/* no prefix */, mod_data);
|
||||
|
||||
static int __init msg_do_config(struct usb_configuration *c)
|
||||
{
|
||||
struct fsg_common *common;
|
||||
@ -137,7 +142,7 @@ static int __init msg_do_config(struct usb_configuration *c)
|
||||
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
||||
}
|
||||
|
||||
common = fsg_common_init(0, c->cdev);
|
||||
common = fsg_common_from_params(0, c->cdev, &mod_data);
|
||||
if (IS_ERR(common))
|
||||
return PTR_ERR(common);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user