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authorMichal Nazarewicz <m.nazarewicz@samsung.com>2009-10-28 16:57:14 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 11:55:18 -0800
commitb6058d0fefc0b5ff777dfbff990a0a50a4ac144b (patch)
tree8ed791c196d814c56a5a0bd16b07b60628aa0254 /drivers/usb/gadget/storage_common.c
parent7e8d5cd93fac4d3720d8f780b350c9421e8997d4 (diff)
USB: g_file_storage: parts of file_storage.c moved to separate file
Moved parts of the file_storage.c file which do not reference fsg_dev structure to newly created storage_common.c file. dump_msg() and dump_cdb() have been changed to macros to remove fsg_dev reference. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/storage_common.c')
-rw-r--r--drivers/usb/gadget/storage_common.c567
1 files changed, 567 insertions, 0 deletions
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
new file mode 100644
index 000000000000..fa86fdaafc1d
--- /dev/null
+++ b/drivers/usb/gadget/storage_common.c
@@ -0,0 +1,567 @@
+/*
+ * storage_common.c -- Common definitions for mass storage functionality
+ *
+ * Copyright (C) 2003-2008 Alan Stern
+ * Copyeight (C) 2009 Samsung Electronics
+ * Author: Michal Nazarewicz (m.nazarewicz@samsung.com)
+ */
+
+
+
+/*-------------------------------------------------------------------------*/
+
+
+#ifndef DEBUG
+#undef VERBOSE_DEBUG
+#undef DUMP_MSGS
+#endif /* !DEBUG */
+
+#ifdef VERBOSE_DEBUG
+#define VLDBG LDBG
+#else
+#define VLDBG(lun, fmt, args...) do { } while (0)
+#endif /* VERBOSE_DEBUG */
+
+#define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
+#define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
+#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
+#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
+
+#define DBG(d, fmt, args...) dev_dbg (&(d)->gadget->dev, fmt, ## args)
+#define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev, fmt, ## args)
+#define ERROR(d, fmt, args...) dev_err (&(d)->gadget->dev, fmt, ## args)
+#define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev, fmt, ## args)
+#define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev, fmt, ## args)
+
+
+
+#ifdef DUMP_MSGS
+
+# define dump_msg(fsg, /* const char * */ label, \
+ /* const u8 * */ buf, /* unsigned */ length) do { \
+ if (length < 512) { \
+ DBG(fsg, "%s, length %u:\n", label, length); \
+ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
+ 16, 1, buf, length, 0); \
+ } \
+} while (0)
+
+# define dump_cdb(fsg) do { } while (0)
+
+#else
+
+# define dump_msg(fsg, /* const char * */ label, \
+ /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
+
+# ifdef VERBOSE_DEBUG
+
+#define dump_cdb(fsg) \
+ print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
+ 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
+
+# else
+
+# define dump_cdb(fsg) do { } while (0)
+
+# endif /* VERBOSE_DEBUG */
+
+#endif /* DUMP_MSGS */
+
+
+
+
+
+/*-------------------------------------------------------------------------*/
+
+/* SCSI device types */
+#define TYPE_DISK 0x00
+#define TYPE_CDROM 0x05
+
+/* USB protocol value = the transport method */
+#define USB_PR_CBI 0x00 // Control/Bulk/Interrupt
+#define USB_PR_CB 0x01 // Control/Bulk w/o interrupt
+#define USB_PR_BULK 0x50 // Bulk-only
+
+/* USB subclass value = the protocol encapsulation */
+#define USB_SC_RBC 0x01 // Reduced Block Commands (flash)
+#define USB_SC_8020 0x02 // SFF-8020i, MMC-2, ATAPI (CD-ROM)
+#define USB_SC_QIC 0x03 // QIC-157 (tape)
+#define USB_SC_UFI 0x04 // UFI (floppy)
+#define USB_SC_8070 0x05 // SFF-8070i (removable)
+#define USB_SC_SCSI 0x06 // Transparent SCSI
+
+/* Bulk-only data structures */
+
+/* Command Block Wrapper */
+struct bulk_cb_wrap {
+ __le32 Signature; // Contains 'USBC'
+ u32 Tag; // Unique per command id
+ __le32 DataTransferLength; // Size of the data
+ u8 Flags; // Direction in bit 7
+ u8 Lun; // LUN (normally 0)
+ u8 Length; // Of the CDB, <= MAX_COMMAND_SIZE
+ u8 CDB[16]; // Command Data Block
+};
+
+#define USB_BULK_CB_WRAP_LEN 31
+#define USB_BULK_CB_SIG 0x43425355 // Spells out USBC
+#define USB_BULK_IN_FLAG 0x80
+
+/* Command Status Wrapper */
+struct bulk_cs_wrap {
+ __le32 Signature; // Should = 'USBS'
+ u32 Tag; // Same as original command
+ __le32 Residue; // Amount not transferred
+ u8 Status; // See below
+};
+
+#define USB_BULK_CS_WRAP_LEN 13
+#define USB_BULK_CS_SIG 0x53425355 // Spells out 'USBS'
+#define USB_STATUS_PASS 0
+#define USB_STATUS_FAIL 1
+#define USB_STATUS_PHASE_ERROR 2
+
+/* Bulk-only class specific requests */
+#define USB_BULK_RESET_REQUEST 0xff
+#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
+
+
+/* CBI Interrupt data structure */
+struct interrupt_data {
+ u8 bType;
+ u8 bValue;
+};
+
+#define CBI_INTERRUPT_DATA_LEN 2
+
+/* CBI Accept Device-Specific Command request */
+#define USB_CBI_ADSC_REQUEST 0x00
+
+
+#define MAX_COMMAND_SIZE 16 // Length of a SCSI Command Data Block
+
+/* SCSI commands that we recognize */
+#define SC_FORMAT_UNIT 0x04
+#define SC_INQUIRY 0x12
+#define SC_MODE_SELECT_6 0x15
+#define SC_MODE_SELECT_10 0x55
+#define SC_MODE_SENSE_6 0x1a
+#define SC_MODE_SENSE_10 0x5a
+#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
+#define SC_READ_6 0x08
+#define SC_READ_10 0x28
+#define SC_READ_12 0xa8
+#define SC_READ_CAPACITY 0x25
+#define SC_READ_FORMAT_CAPACITIES 0x23
+#define SC_READ_HEADER 0x44
+#define SC_READ_TOC 0x43
+#define SC_RELEASE 0x17
+#define SC_REQUEST_SENSE 0x03
+#define SC_RESERVE 0x16
+#define SC_SEND_DIAGNOSTIC 0x1d
+#define SC_START_STOP_UNIT 0x1b
+#define SC_SYNCHRONIZE_CACHE 0x35
+#define SC_TEST_UNIT_READY 0x00
+#define SC_VERIFY 0x2f
+#define SC_WRITE_6 0x0a
+#define SC_WRITE_10 0x2a
+#define SC_WRITE_12 0xaa
+
+/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
+#define SS_NO_SENSE 0
+#define SS_COMMUNICATION_FAILURE 0x040800
+#define SS_INVALID_COMMAND 0x052000
+#define SS_INVALID_FIELD_IN_CDB 0x052400
+#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
+#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
+#define SS_MEDIUM_NOT_PRESENT 0x023a00
+#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
+#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
+#define SS_RESET_OCCURRED 0x062900
+#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
+#define SS_UNRECOVERED_READ_ERROR 0x031100
+#define SS_WRITE_ERROR 0x030c02
+#define SS_WRITE_PROTECTED 0x072700
+
+#define SK(x) ((u8) ((x) >> 16)) // Sense Key byte, etc.
+#define ASC(x) ((u8) ((x) >> 8))
+#define ASCQ(x) ((u8) (x))
+
+
+/*-------------------------------------------------------------------------*/
+
+
+struct lun {
+ struct file *filp;
+ loff_t file_length;
+ loff_t num_sectors;
+
+ unsigned int ro : 1;
+ unsigned int prevent_medium_removal : 1;
+ unsigned int registered : 1;
+ unsigned int info_valid : 1;
+
+ u32 sense_data;
+ u32 sense_data_info;
+ u32 unit_attention_data;
+
+ struct device dev;
+};
+
+#define backing_file_is_open(curlun) ((curlun)->filp != NULL)
+
+static struct lun *dev_to_lun(struct device *dev)
+{
+ return container_of(dev, struct lun, dev);
+}
+
+
+/* Big enough to hold our biggest descriptor */
+#define EP0_BUFSIZE 256
+#define DELAYED_STATUS (EP0_BUFSIZE + 999) // An impossibly large value
+
+/* Number of buffers we will use. 2 is enough for double-buffering */
+#define NUM_BUFFERS 2
+
+enum fsg_buffer_state {
+ BUF_STATE_EMPTY = 0,
+ BUF_STATE_FULL,
+ BUF_STATE_BUSY
+};
+
+struct fsg_buffhd {
+ void *buf;
+ enum fsg_buffer_state state;
+ struct fsg_buffhd *next;
+
+ /* The NetChip 2280 is faster, and handles some protocol faults
+ * better, if we don't submit any short bulk-out read requests.
+ * So we will record the intended request length here. */
+ unsigned int bulk_out_intended_length;
+
+ struct usb_request *inreq;
+ int inreq_busy;
+ struct usb_request *outreq;
+ int outreq_busy;
+};
+
+enum fsg_state {
+ FSG_STATE_COMMAND_PHASE = -10, // This one isn't used anywhere
+ FSG_STATE_DATA_PHASE,
+ FSG_STATE_STATUS_PHASE,
+
+ FSG_STATE_IDLE = 0,
+ FSG_STATE_ABORT_BULK_OUT,
+ FSG_STATE_RESET,
+ FSG_STATE_INTERFACE_CHANGE,
+ FSG_STATE_CONFIG_CHANGE,
+ FSG_STATE_DISCONNECT,
+ FSG_STATE_EXIT,
+ FSG_STATE_TERMINATED
+};
+
+enum data_direction {
+ DATA_DIR_UNKNOWN = 0,
+ DATA_DIR_FROM_HOST,
+ DATA_DIR_TO_HOST,
+ DATA_DIR_NONE
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+
+static inline u32 get_unaligned_be24(u8 *buf)
+{
+ return 0xffffff & (u32) get_unaligned_be32(buf - 1);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+
+#define STRING_MANUFACTURER 1
+#define STRING_PRODUCT 2
+#define STRING_SERIAL 3
+#define STRING_CONFIG 4
+#define STRING_INTERFACE 5
+
+
+static struct usb_otg_descriptor
+otg_desc = {
+ .bLength = sizeof(otg_desc),
+ .bDescriptorType = USB_DT_OTG,
+
+ .bmAttributes = USB_OTG_SRP,
+};
+
+/* There is only one interface. */
+
+static struct usb_interface_descriptor
+intf_desc = {
+ .bLength = sizeof intf_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bNumEndpoints = 2, // Adjusted during fsg_bind()
+ .bInterfaceClass = USB_CLASS_MASS_STORAGE,
+ .bInterfaceSubClass = USB_SC_SCSI, // Adjusted during fsg_bind()
+ .bInterfaceProtocol = USB_PR_BULK, // Adjusted during fsg_bind()
+ .iInterface = STRING_INTERFACE,
+};
+
+/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
+ * and interrupt-in. */
+
+static struct usb_endpoint_descriptor
+fs_bulk_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ /* wMaxPacketSize set by autoconfiguration */
+};
+
+static struct usb_endpoint_descriptor
+fs_bulk_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ /* wMaxPacketSize set by autoconfiguration */
+};
+
+static struct usb_endpoint_descriptor
+fs_intr_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = cpu_to_le16(2),
+ .bInterval = 32, // frames -> 32 ms
+};
+
+static const struct usb_descriptor_header *fs_function[] = {
+ (struct usb_descriptor_header *) &otg_desc,
+ (struct usb_descriptor_header *) &intf_desc,
+ (struct usb_descriptor_header *) &fs_bulk_in_desc,
+ (struct usb_descriptor_header *) &fs_bulk_out_desc,
+ (struct usb_descriptor_header *) &fs_intr_in_desc,
+ NULL,
+};
+#define FS_FUNCTION_PRE_EP_ENTRIES 2
+
+
+/*
+ * USB 2.0 devices need to expose both high speed and full speed
+ * descriptors, unless they only run at full speed.
+ *
+ * That means alternate endpoint descriptors (bigger packets)
+ * and a "device qualifier" ... plus more construction options
+ * for the config descriptor.
+ */
+static struct usb_endpoint_descriptor
+hs_bulk_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor
+hs_bulk_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = cpu_to_le16(512),
+ .bInterval = 1, // NAK every 1 uframe
+};
+
+static struct usb_endpoint_descriptor
+hs_intr_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = cpu_to_le16(2),
+ .bInterval = 9, // 2**(9-1) = 256 uframes -> 32 ms
+};
+
+static const struct usb_descriptor_header *hs_function[] = {
+ (struct usb_descriptor_header *) &otg_desc,
+ (struct usb_descriptor_header *) &intf_desc,
+ (struct usb_descriptor_header *) &hs_bulk_in_desc,
+ (struct usb_descriptor_header *) &hs_bulk_out_desc,
+ (struct usb_descriptor_header *) &hs_intr_in_desc,
+ NULL,
+};
+#define HS_FUNCTION_PRE_EP_ENTRIES 2
+
+/* Maxpacket and other transfer characteristics vary by speed. */
+static struct usb_endpoint_descriptor *
+ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
+ struct usb_endpoint_descriptor *hs)
+{
+ if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
+ return hs;
+ return fs;
+}
+
+
+/* The CBI specification limits the serial string to 12 uppercase hexadecimal
+ * characters. */
+static char manufacturer[64];
+static char serial[13];
+
+/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
+static struct usb_string strings[] = {
+ {STRING_MANUFACTURER, manufacturer},
+ {STRING_PRODUCT, longname},
+ {STRING_SERIAL, serial},
+ {STRING_CONFIG, "Self-powered"},
+ {STRING_INTERFACE, "Mass Storage"},
+ {}
+};
+
+static struct usb_gadget_strings stringtab = {
+ .language = 0x0409, // en-us
+ .strings = strings,
+};
+
+
+ /*-------------------------------------------------------------------------*/
+
+/* If the next two routines are called while the gadget is registered,
+ * the caller must own fsg->filesem for writing. */
+
+static int open_backing_file(struct lun *curlun, const char *filename)
+{
+ int ro;
+ struct file *filp = NULL;
+ int rc = -EINVAL;
+ struct inode *inode = NULL;
+ loff_t size;
+ loff_t num_sectors;
+ loff_t min_sectors;
+
+ /* R/W if we can, R/O if we must */
+ ro = curlun->ro;
+ if (!ro) {
+ filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
+ if (-EROFS == PTR_ERR(filp))
+ ro = 1;
+ }
+ if (ro)
+ filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
+ if (IS_ERR(filp)) {
+ LINFO(curlun, "unable to open backing file: %s\n", filename);
+ return PTR_ERR(filp);
+ }
+
+ if (!(filp->f_mode & FMODE_WRITE))
+ ro = 1;
+
+ if (filp->f_path.dentry)
+ inode = filp->f_path.dentry->d_inode;
+ if (inode && S_ISBLK(inode->i_mode)) {
+ if (bdev_read_only(inode->i_bdev))
+ ro = 1;
+ } else if (!inode || !S_ISREG(inode->i_mode)) {
+ LINFO(curlun, "invalid file type: %s\n", filename);
+ goto out;
+ }
+
+ /* If we can't read the file, it's no good.
+ * If we can't write the file, use it read-only. */
+ if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
+ LINFO(curlun, "file not readable: %s\n", filename);
+ goto out;
+ }
+ if (!(filp->f_op->write || filp->f_op->aio_write))
+ ro = 1;
+
+ size = i_size_read(inode->i_mapping->host);
+ if (size < 0) {
+ LINFO(curlun, "unable to find file size: %s\n", filename);
+ rc = (int) size;
+ goto out;
+ }
+ num_sectors = size >> 9; // File size in 512-byte blocks
+ min_sectors = 1;
+ if (mod_data.cdrom) {
+ num_sectors &= ~3; // Reduce to a multiple of 2048
+ min_sectors = 300*4; // Smallest track is 300 frames
+ if (num_sectors >= 256*60*75*4) {
+ num_sectors = (256*60*75 - 1) * 4;
+ LINFO(curlun, "file too big: %s\n", filename);
+ LINFO(curlun, "using only first %d blocks\n",
+ (int) num_sectors);
+ }
+ }
+ if (num_sectors < min_sectors) {
+ LINFO(curlun, "file too small: %s\n", filename);
+ rc = -ETOOSMALL;
+ goto out;
+ }
+
+ get_file(filp);
+ curlun->ro = ro;
+ curlun->filp = filp;
+ curlun->file_length = size;
+ curlun->num_sectors = num_sectors;
+ LDBG(curlun, "open backing file: %s\n", filename);
+ rc = 0;
+
+out:
+ filp_close(filp, current->files);
+ return rc;
+}
+
+
+static void close_backing_file(struct lun *curlun)
+{
+ if (curlun->filp) {
+ LDBG(curlun, "close backing file\n");
+ fput(curlun->filp);
+ curlun->filp = NULL;
+ }
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Sync the file data, don't bother with the metadata.
+ * This code was copied from fs/buffer.c:sys_fdatasync(). */
+static int fsync_sub(struct lun *curlun)
+{
+ struct file *filp = curlun->filp;
+
+ if (curlun->ro || !filp)
+ return 0;
+ return vfs_fsync(filp, filp->f_path.dentry, 1);
+}
+
+static void store_cdrom_address(u8 *dest, int msf, u32 addr)
+{
+ if (msf) {
+ /* Convert to Minutes-Seconds-Frames */
+ addr >>= 2; /* Convert to 2048-byte frames */
+ addr += 2*75; /* Lead-in occupies 2 seconds */
+ dest[3] = addr % 75; /* Frames */
+ addr /= 75;
+ dest[2] = addr % 60; /* Seconds */
+ addr /= 60;
+ dest[1] = addr; /* Minutes */
+ dest[0] = 0; /* Reserved */
+ } else {
+ /* Absolute sector */
+ put_unaligned_be32(addr, dest);
+ }
+}