/* * Driver for USB Mass Storage compliant devices * * Current development and maintenance by: * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) * * Developed with the assistance of: * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) * (c) 2002 Alan Stern (stern@rowland.org) * * Initial work by: * (c) 1999 Michael Gee (michael@linuxspecific.com) * * This driver is based on the 'USB Mass Storage Class' document. This * describes in detail the protocol used to communicate with such * devices. Clearly, the designers had SCSI and ATAPI commands in * mind when they created this document. The commands are all very * similar to commands in the SCSI-II and ATAPI specifications. * * It is important to note that in a number of cases this class * exhibits class-specific exemptions from the USB specification. * Notably the usage of NAK, STALL and ACK differs from the norm, in * that they are used to communicate wait, failed and OK on commands. * * Also, for certain devices, the interrupt endpoint is used to convey * status of a command. * * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more * information about this driver. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include "usb.h" #include "protocol.h" #include "debug.h" #include "scsiglue.h" #include "transport.h" /*********************************************************************** * Protocol routines ***********************************************************************/ void usb_stor_pad12_command(struct scsi_cmnd *srb, struct us_data *us) { /* * Pad the SCSI command with zeros out to 12 bytes. If the * command already is 12 bytes or longer, leave it alone. * * NOTE: This only works because a scsi_cmnd struct field contains * a unsigned char cmnd[16], so we know we have storage available */ for (; srb->cmd_len < 12; srb->cmd_len++) srb->cmnd[srb->cmd_len] = 0; /* send the command to the transport layer */ usb_stor_invoke_transport(srb, us); } void usb_stor_ufi_command(struct scsi_cmnd *srb, struct us_data *us) { /* * fix some commands -- this is a form of mode translation * UFI devices only accept 12 byte long commands * * NOTE: This only works because a scsi_cmnd struct field contains * a unsigned char cmnd[16], so we know we have storage available */ /* Pad the ATAPI command with zeros */ for (; srb->cmd_len < 12; srb->cmd_len++) srb->cmnd[srb->cmd_len] = 0; /* set command length to 12 bytes (this affects the transport layer) */ srb->cmd_len = 12; /* XXX We should be constantly re-evaluating the need for these */ /* determine the correct data length for these commands */ switch (srb->cmnd[0]) { /* for INQUIRY, UFI devices only ever return 36 bytes */ case INQUIRY: srb->cmnd[4] = 36; break; /* again, for MODE_SENSE_10, we get the minimum (8) */ case MODE_SENSE_10: srb->cmnd[7] = 0; srb->cmnd[8] = 8; break; /* for REQUEST_SENSE, UFI devices only ever return 18 bytes */ case REQUEST_SENSE: srb->cmnd[4] = 18; break; } /* end switch on cmnd[0] */ /* send the command to the transport layer */ usb_stor_invoke_transport(srb, us); } void usb_stor_transparent_scsi_command(struct scsi_cmnd *srb, struct us_data *us) { /* send the command to the transport layer */ usb_stor_invoke_transport(srb, us); } EXPORT_SYMBOL_GPL(usb_stor_transparent_scsi_command); /*********************************************************************** * Scatter-gather transfer buffer access routines ***********************************************************************/ /* * Copy a buffer of length buflen to/from the srb's transfer buffer. * Update the **sgptr and *offset variables so that the next copy will * pick up from where this one left off. */ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer, unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **sgptr, unsigned int *offset, enum xfer_buf_dir dir) { unsigned int cnt = 0; struct scatterlist *sg = *sgptr; struct sg_mapping_iter miter; unsigned int nents = scsi_sg_count(srb); if (sg) nents = sg_nents(sg); else sg = scsi_sglist(srb); sg_miter_start(&miter, sg, nents, dir == FROM_XFER_BUF ? SG_MITER_FROM_SG: SG_MITER_TO_SG); if (!sg_miter_skip(&miter, *offset)) return cnt; while (sg_miter_next(&miter) && cnt < buflen) { unsigned int len = min_t(unsigned int, miter.length, buflen - cnt); if (dir == FROM_XFER_BUF) memcpy(buffer + cnt, miter.addr, len); else memcpy(miter.addr, buffer + cnt, len); if (*offset + len < miter.piter.sg->length) { *offset += len; *sgptr = miter.piter.sg; } else { *offset = 0; *sgptr = sg_next(miter.piter.sg); } cnt += len; } sg_miter_stop(&miter); return cnt; } EXPORT_SYMBOL_GPL(usb_stor_access_xfer_buf); /* * Store the contents of buffer into srb's transfer buffer and set the * SCSI residue. */ void usb_stor_set_xfer_buf(unsigned char *buffer, unsigned int buflen, struct scsi_cmnd *srb) { unsigned int offset = 0; struct scatterlist *sg = NULL; buflen = min(buflen, scsi_bufflen(srb)); buflen = usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset, TO_XFER_BUF); if (buflen < scsi_bufflen(srb)) scsi_set_resid(srb, scsi_bufflen(srb) - buflen); } EXPORT_SYMBOL_GPL(usb_stor_set_xfer_buf); diff/tools/perf/util?h=nds-private-remove&id=1b5b42216469b05ef4b5916cb40b127dfab1da88&id2=1001354ca34179f3db924eb66672442a173147dc'>diff)
regulator: core: Add new API to poll for error conditions
Regulator consumers can receive event notifications when errors are reported to the driver, but currently, there is no way for a regulator consumer to know when the error is over. To allow a regulator consumer to poll for error conditions add a new API: regulator_get_error_flags. Signed-off-by: Axel Haslam <ahaslam@baylibre.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'tools/perf/util')