From 837a0443cc560c614007ee839ca6d8fd0a51644a Mon Sep 17 00:00:00 2001 From: Mike Lockwood Date: Tue, 15 Jun 2010 17:34:25 -0700 Subject: [PATCH] USB: gadget: f_mass_storage: Integrate android customizations Integrate support for android composite driver and platform data within CONFIG_USB_ANDROID_MASS_STORAGE. Signed-off-by: Mike Lockwood --- drivers/usb/gadget/Makefile | 2 +- drivers/usb/gadget/f_mass_storage.c | 80 + drivers/usb/gadget/f_mass_storage_tmp.c | 3019 ------------------------------- 3 files changed, 81 insertions(+), 3020 deletions(-) delete mode 100644 drivers/usb/gadget/f_mass_storage_tmp.c diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile index 216271a..f3a5061 100644 --- a/drivers/usb/gadget/Makefile +++ b/drivers/usb/gadget/Makefile @@ -70,5 +70,5 @@ obj-$(CONFIG_USB_G_NCM) += g_ncm.o obj-$(CONFIG_USB_ANDROID) += android.o obj-$(CONFIG_USB_ANDROID_ACM) += f_acm.o u_serial.o obj-$(CONFIG_USB_ANDROID_ADB) += f_adb.o -obj-$(CONFIG_USB_ANDROID_MASS_STORAGE) += f_mass_storage_tmp.o +obj-$(CONFIG_USB_ANDROID_MASS_STORAGE) += f_mass_storage.o obj-$(CONFIG_USB_ANDROID_RNDIS) += f_rndis.o u_ether.o diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index efb58f9..a5d2f24 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -297,6 +297,12 @@ #include "gadget_chips.h" +#ifdef CONFIG_USB_ANDROID_MASS_STORAGE +#include +#include + +#define FUNCTION_NAME "usb_mass_storage" +#endif /*------------------------------------------------------------------------*/ @@ -432,6 +438,10 @@ struct fsg_config { u16 release; char can_stall; + +#ifdef CONFIG_USB_ANDROID_MASS_STORAGE + struct platform_device *pdev; +#endif }; struct fsg_dev { @@ -2780,7 +2790,13 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common, curlun->initially_ro = curlun->ro; curlun->removable = lcfg->removable; curlun->dev.release = fsg_lun_release; + +#ifdef CONFIG_USB_ANDROID_MASS_STORAGE + /* use "usb_mass_storage" platform device as parent */ + curlun->dev.parent = &cfg->pdev->dev; +#else curlun->dev.parent = &gadget->dev; +#endif /* curlun->dev.driver = &fsg_driver.driver; XXX */ dev_set_drvdata(&curlun->dev, &common->filesem); dev_set_name(&curlun->dev, @@ -3052,7 +3068,11 @@ static int fsg_bind_config(struct usb_composite_dev *cdev, if (unlikely(!fsg)) return -ENOMEM; +#ifdef CONFIG_USB_ANDROID_MASS_STORAGE + fsg->function.name = FUNCTION_NAME; +#else fsg->function.name = FSG_DRIVER_DESC; +#endif fsg->function.strings = fsg_strings_array; fsg->function.bind = fsg_bind; fsg->function.unbind = fsg_unbind; @@ -3178,3 +3198,63 @@ fsg_common_from_params(struct fsg_common *common, return fsg_common_init(common, cdev, &cfg); } +#ifdef CONFIG_USB_ANDROID_MASS_STORAGE + +static struct fsg_config fsg_cfg; + +static int __init fsg_probe(struct platform_device *pdev) +{ + struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data; + int i, nluns; + + printk(KERN_INFO "fsg_probe pdev: %p, pdata: %p\n", pdev, pdata); + if (!pdata) + return -1; + + nluns = pdata->nluns; + if (nluns > FSG_MAX_LUNS) + nluns = FSG_MAX_LUNS; + fsg_cfg.nluns = nluns; + for (i = 0; i < nluns; i++) + fsg_cfg.luns[i].removable = 1; + + fsg_cfg.vendor_name = pdata->vendor; + fsg_cfg.product_name = pdata->product; + fsg_cfg.release = pdata->release; + fsg_cfg.can_stall = 0; + fsg_cfg.pdev = pdev; + + return 0; +} + +static struct platform_driver fsg_platform_driver = { + .driver = { .name = FUNCTION_NAME, }, + .probe = fsg_probe, +}; + +int mass_storage_bind_config(struct usb_configuration *c) +{ + struct fsg_common *common = fsg_common_init(NULL, c->cdev, &fsg_cfg); + if (IS_ERR(common)) + return -1; + return fsg_add(c->cdev, c, common); +} + +static struct android_usb_function mass_storage_function = { + .name = FUNCTION_NAME, + .bind_config = mass_storage_bind_config, +}; + +static int __init init(void) +{ + int rc; + printk(KERN_INFO "f_mass_storage init\n"); + rc = platform_driver_register(&fsg_platform_driver); + if (rc != 0) + return rc; + android_register_function(&mass_storage_function); + return 0; +}module_init(init); + +#endif /* CONFIG_USB_ANDROID_MASS_STORAGE */ + diff --git a/drivers/usb/gadget/f_mass_storage_tmp.c b/drivers/usb/gadget/f_mass_storage_tmp.c deleted file mode 100644 index 14fd333..0000000 --- a/drivers/usb/gadget/f_mass_storage_tmp.c +++ /dev/null @@ -1,3019 +0,0 @@ -/* - * drivers/usb/gadget/f_mass_storage.c - * - * Function Driver for USB Mass Storage - * - * Copyright (C) 2008 Google, Inc. - * Author: Mike Lockwood - * - * Based heavily on the file_storage gadget driver in - * drivers/usb/gadget/file_storage.c and licensed under the same terms: - * - * Copyright (C) 2003-2007 Alan Stern - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions, and the following disclaimer, - * without modification. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The names of the above-listed copyright holders may not be used - * to endorse or promote products derived from this software without - * specific prior written permission. - * - * ALTERNATIVELY, this software may be distributed under the terms of the - * GNU General Public License ("GPL") as published by the Free Software - * Foundation, either version 2 of that License or (at your option) any - * later version. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS - * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, - * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -/* #define DEBUG */ -/* #define VERBOSE_DEBUG */ -/* #define DUMP_MSGS */ - - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -#include "gadget_chips.h" - - -#define BULK_BUFFER_SIZE 4096 - -/* flush after every 4 meg of writes to avoid excessive block level caching */ -#define MAX_UNFLUSHED_BYTES (4 * 1024 * 1024) - -/*-------------------------------------------------------------------------*/ - -#define DRIVER_NAME "usb_mass_storage" -#define MAX_LUNS 8 - -static const char shortname[] = DRIVER_NAME; - -#ifdef DEBUG -#define LDBG(lun, fmt, args...) \ - dev_dbg(&(lun)->dev , fmt , ## args) -#define MDBG(fmt,args...) \ - printk(KERN_DEBUG DRIVER_NAME ": " fmt , ## args) -#else -#define LDBG(lun, fmt, args...) \ - do { } while (0) -#define MDBG(fmt,args...) \ - do { } while (0) -#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 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 MINFO(fmt,args...) \ - printk(KERN_INFO DRIVER_NAME ": " fmt , ## args) - -#undef DBG -#undef VDBG -#undef ERROR -#undef WARNING -#undef INFO -#define DBG(d, fmt, args...) \ - dev_dbg(&(d)->cdev->gadget->dev , fmt , ## args) -#define VDBG(d, fmt, args...) \ - dev_vdbg(&(d)->cdev->gadget->dev , fmt , ## args) -#define ERROR(d, fmt, args...) \ - dev_err(&(d)->cdev->gadget->dev , fmt , ## args) -#define WARNING(d, fmt, args...) \ - dev_warn(&(d)->cdev->gadget->dev , fmt , ## args) -#define INFO(d, fmt, args...) \ - dev_info(&(d)->cdev->gadget->dev , fmt , ## args) - - -/*-------------------------------------------------------------------------*/ - -/* 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 - -/* Length of a SCSI Command Data Block */ -#define MAX_COMMAND_SIZE 16 - -/* 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_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 unflushed_bytes; - - 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 - -/* 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 { - /* This one isn't used anywhere */ - FSG_STATE_COMMAND_PHASE = -10, - - FSG_STATE_DATA_PHASE, - FSG_STATE_STATUS_PHASE, - - FSG_STATE_IDLE = 0, - FSG_STATE_ABORT_BULK_OUT, - FSG_STATE_RESET, - FSG_STATE_CONFIG_CHANGE, - FSG_STATE_EXIT, - FSG_STATE_TERMINATED -}; - -enum data_direction { - DATA_DIR_UNKNOWN = 0, - DATA_DIR_FROM_HOST, - DATA_DIR_TO_HOST, - DATA_DIR_NONE -}; - -struct fsg_dev { - struct usb_function function; - struct usb_composite_dev *cdev; - - /* optional "usb_mass_storage" platform device */ - struct platform_device *pdev; - - /* lock protects: state and all the req_busy's */ - spinlock_t lock; - - /* filesem protects: backing files in use */ - struct rw_semaphore filesem; - - /* reference counting: wait until all LUNs are released */ - struct kref ref; - - unsigned int bulk_out_maxpacket; - enum fsg_state state; /* For exception handling */ - - u8 config, new_config; - - unsigned int running : 1; - unsigned int bulk_in_enabled : 1; - unsigned int bulk_out_enabled : 1; - unsigned int phase_error : 1; - unsigned int short_packet_received : 1; - unsigned int bad_lun_okay : 1; - - unsigned long atomic_bitflags; -#define REGISTERED 0 -#define CLEAR_BULK_HALTS 1 -#define SUSPENDED 2 - - struct usb_ep *bulk_in; - struct usb_ep *bulk_out; - - struct fsg_buffhd *next_buffhd_to_fill; - struct fsg_buffhd *next_buffhd_to_drain; - struct fsg_buffhd buffhds[NUM_BUFFERS]; - - int thread_wakeup_needed; - struct completion thread_notifier; - struct task_struct *thread_task; - - int cmnd_size; - u8 cmnd[MAX_COMMAND_SIZE]; - enum data_direction data_dir; - u32 data_size; - u32 data_size_from_cmnd; - u32 tag; - unsigned int lun; - u32 residue; - u32 usb_amount_left; - - unsigned int nluns; - struct lun *luns; - struct lun *curlun; - - u32 buf_size; - const char *vendor; - const char *product; - int release; - - struct switch_dev sdev; - - struct wake_lock wake_lock; -}; - -static inline struct fsg_dev *func_to_dev(struct usb_function *f) -{ - return container_of(f, struct fsg_dev, function); -} - -static int exception_in_progress(struct fsg_dev *fsg) -{ - return (fsg->state > FSG_STATE_IDLE); -} - -/* Make bulk-out requests be divisible by the maxpacket size */ -static void set_bulk_out_req_length(struct fsg_dev *fsg, - struct fsg_buffhd *bh, unsigned int length) -{ - unsigned int rem; - - bh->bulk_out_intended_length = length; - rem = length % fsg->bulk_out_maxpacket; - if (rem > 0) - length += fsg->bulk_out_maxpacket - rem; - bh->outreq->length = length; -} - -static struct fsg_dev *the_fsg; - -static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun); -static void close_all_backing_files(struct fsg_dev *fsg); -static int fsync_sub(struct lun *curlun); - -/*-------------------------------------------------------------------------*/ - -#ifdef DUMP_MSGS - -static void dump_msg(struct fsg_dev *fsg, const char *label, - const u8 *buf, unsigned int length) -{ - if (length < 512) { - DBG(fsg, "%s, length %u:\n", label, length); - print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, - 16, 1, buf, length, 0); - } -} - -static void dump_cdb(struct fsg_dev *fsg) -{} - -#else - -static void dump_msg(struct fsg_dev *fsg, const char *label, - const u8 *buf, unsigned int length) -{} - -#ifdef VERBOSE_DEBUG - -static void dump_cdb(struct fsg_dev *fsg) -{ - print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, - 16, 1, fsg->cmnd, fsg->cmnd_size, 0); -} - -#else - -static void dump_cdb(struct fsg_dev *fsg) -{} - -#endif /* VERBOSE_DEBUG */ -#endif /* DUMP_MSGS */ - - -/*-------------------------------------------------------------------------*/ - -/* Routines for unaligned data access */ - -static u16 get_be16(u8 *buf) -{ - return ((u16) buf[0] << 8) | ((u16) buf[1]); -} - -static u32 get_be32(u8 *buf) -{ - return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) | - ((u32) buf[2] << 8) | ((u32) buf[3]); -} - -static void put_be16(u8 *buf, u16 val) -{ - buf[0] = val >> 8; - buf[1] = val; -} - -static void put_be32(u8 *buf, u32 val) -{ - buf[0] = val >> 24; - buf[1] = val >> 16; - buf[2] = val >> 8; - buf[3] = val & 0xff; -} - -/*-------------------------------------------------------------------------*/ - -/* - * DESCRIPTORS ... most are static, but strings and (full) configuration - * descriptors are built on demand. Also the (static) config and interface - * descriptors are adjusted during fsg_bind(). - */ - -/* 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 = US_SC_SCSI, - .bInterfaceProtocol = US_PR_BULK, -}; - -/* 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_descriptor_header *fs_function[] = { - (struct usb_descriptor_header *) &intf_desc, - (struct usb_descriptor_header *) &fs_bulk_in_desc, - (struct usb_descriptor_header *) &fs_bulk_out_desc, - NULL, -}; -#define FS_FUNCTION_PRE_EP_ENTRIES 2 - - -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 = __constant_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 = __constant_cpu_to_le16(512), - .bInterval = 1, /* NAK every 1 uframe */ -}; - - -static struct usb_descriptor_header *hs_function[] = { - (struct usb_descriptor_header *) &intf_desc, - (struct usb_descriptor_header *) &hs_bulk_in_desc, - (struct usb_descriptor_header *) &hs_bulk_out_desc, - NULL, -}; - -/* 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; -} - -/*-------------------------------------------------------------------------*/ - -/* 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; - if (fsg->thread_task) - wake_up_process(fsg->thread_task); -} - - -static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state) -{ - unsigned long flags; - - DBG(fsg, "raise_exception %d\n", (int)new_state); - /* Do nothing if a higher-priority exception is already in progress. - * If a lower-or-equal priority exception is in progress, preempt it - * and notify the main thread by sending it a signal. */ - spin_lock_irqsave(&fsg->lock, flags); - if (fsg->state <= new_state) { - fsg->state = new_state; - if (fsg->thread_task) - send_sig_info(SIGUSR1, SEND_SIG_FORCED, - fsg->thread_task); - } - spin_unlock_irqrestore(&fsg->lock, flags); -} - - -/*-------------------------------------------------------------------------*/ - -/* Bulk and interrupt endpoint completion handlers. - * These always run in_irq. */ - -static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) -{ - struct fsg_dev *fsg = ep->driver_data; - struct fsg_buffhd *bh = req->context; - unsigned long flags; - - if (req->status || req->actual != req->length) - DBG(fsg, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, req->length); - - /* Hold the lock while we update the request and buffer states */ - smp_wmb(); - spin_lock_irqsave(&fsg->lock, flags); - bh->inreq_busy = 0; - bh->state = BUF_STATE_EMPTY; - wakeup_thread(fsg); - spin_unlock_irqrestore(&fsg->lock, flags); -} - -static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) -{ - struct fsg_dev *fsg = ep->driver_data; - struct fsg_buffhd *bh = req->context; - unsigned long flags; - - dump_msg(fsg, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != bh->bulk_out_intended_length) - DBG(fsg, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, - bh->bulk_out_intended_length); - - /* Hold the lock while we update the request and buffer states */ - smp_wmb(); - spin_lock_irqsave(&fsg->lock, flags); - bh->outreq_busy = 0; - bh->state = BUF_STATE_FULL; - wakeup_thread(fsg); - spin_unlock_irqrestore(&fsg->lock, flags); -} - -static int fsg_function_setup(struct usb_function *f, - const struct usb_ctrlrequest *ctrl) -{ - struct fsg_dev *fsg = func_to_dev(f); - struct usb_composite_dev *cdev = fsg->cdev; - int value = -EOPNOTSUPP; - u16 w_index = le16_to_cpu(ctrl->wIndex); - u16 w_value = le16_to_cpu(ctrl->wValue); - u16 w_length = le16_to_cpu(ctrl->wLength); - - DBG(fsg, "fsg_function_setup\n"); - /* Handle Bulk-only class-specific requests */ - if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { - DBG(fsg, "USB_TYPE_CLASS\n"); - switch (ctrl->bRequest) { - case USB_BULK_RESET_REQUEST: - if (ctrl->bRequestType != (USB_DIR_OUT | - USB_TYPE_CLASS | USB_RECIP_INTERFACE)) - break; - if (w_index != 0 || w_value != 0) { - value = -EDOM; - break; - } - - /* Raise an exception to stop the current operation - * and reinitialize our state. */ - DBG(fsg, "bulk reset request\n"); - raise_exception(fsg, FSG_STATE_RESET); - value = 0; - break; - - case USB_BULK_GET_MAX_LUN_REQUEST: - if (ctrl->bRequestType != (USB_DIR_IN | - USB_TYPE_CLASS | USB_RECIP_INTERFACE)) - break; - if (w_index != 0 || w_value != 0) { - value = -EDOM; - break; - } - VDBG(fsg, "get max LUN\n"); - *(u8 *)cdev->req->buf = fsg->nluns - 1; - value = 1; - break; - } - } - - /* respond with data transfer or status phase? */ - if (value >= 0) { - int rc; - cdev->req->zero = value < w_length; - cdev->req->length = value; - rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); - if (rc < 0) - printk("%s setup response queue error\n", __func__); - } - - if (value == -EOPNOTSUPP) - VDBG(fsg, - "unknown class-specific control req " - "%02x.%02x v%04x i%04x l%u\n", - ctrl->bRequestType, ctrl->bRequest, - le16_to_cpu(ctrl->wValue), w_index, w_length); - return value; -} - -/*-------------------------------------------------------------------------*/ - -/* All the following routines run in process context */ - - -/* 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, int *pbusy, - enum fsg_buffer_state *state) -{ - int rc; - unsigned long flags; - - DBG(fsg, "start_transfer req: %p, req->buf: %p\n", req, req->buf); - if (ep == fsg->bulk_in) - dump_msg(fsg, "bulk-in", req->buf, req->length); - - spin_lock_irqsave(&fsg->lock, flags); - *pbusy = 1; - *state = BUF_STATE_BUSY; - spin_unlock_irqrestore(&fsg->lock, flags); - rc = usb_ep_queue(ep, req, GFP_KERNEL); - if (rc != 0) { - *pbusy = 0; - *state = BUF_STATE_EMPTY; - - /* We can't do much more than wait for a reset */ - - /* Note: currently the net2280 driver fails zero-length - * submissions if DMA is enabled. */ - if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP && - req->length == 0)) - WARN(fsg, "error in submission: %s --> %d\n", - (ep == fsg->bulk_in ? "bulk-in" : "bulk-out"), - rc); - } -} - - -static int sleep_thread(struct fsg_dev *fsg) -{ - int rc = 0; - - /* Wait until a signal arrives or we are woken up */ - 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; - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -static int do_read(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - u32 lba; - struct fsg_buffhd *bh; - int rc; - u32 amount_left; - loff_t file_offset, file_offset_tmp; - unsigned int amount; - unsigned int partial_page; - ssize_t nread; - - /* Get the starting Logical Block Address and check that it's - * not too big */ - if (fsg->cmnd[0] == SC_READ_6) - lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]); - else { - lba = get_be32(&fsg->cmnd[2]); - - /* We allow DPO (Disable Page Out = don't save data in the - * cache) and FUA (Force Unit Access = don't read from the - * cache), but we don't implement them. */ - if ((fsg->cmnd[1] & ~0x18) != 0) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - } - if (lba >= curlun->num_sectors) { - curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - return -EINVAL; - } - file_offset = ((loff_t) lba) << 9; - - /* Carry out the file reads */ - amount_left = fsg->data_size_from_cmnd; - if (unlikely(amount_left == 0)) - return -EIO; /* No default reply */ - - for (;;) { - - /* Figure out how much we need to read: - * Try to read the remaining amount. - * But don't read more than the buffer size. - * And don't try to read past the end of the file. - * Finally, if we're not at a page boundary, don't read past - * the next page. - * If this means reading 0 then we were asked to read past - * the end of file. */ - amount = min((unsigned int) amount_left, - (unsigned int)fsg->buf_size); - amount = min((loff_t) amount, - curlun->file_length - file_offset); - partial_page = file_offset & (PAGE_CACHE_SIZE - 1); - if (partial_page > 0) - amount = min(amount, (unsigned int) PAGE_CACHE_SIZE - - partial_page); - - /* Wait for the next buffer to become available */ - bh = fsg->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(fsg); - if (rc) - return rc; - } - - /* If we were asked to read past the end of file, - * end with an empty buffer. */ - if (amount == 0) { - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - bh->inreq->length = 0; - bh->state = BUF_STATE_FULL; - break; - } - - /* Perform the read */ - file_offset_tmp = file_offset; - nread = vfs_read(curlun->filp, - (char __user *) bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, - (unsigned long long) file_offset, - (int) nread); - if (signal_pending(current)) - return -EINTR; - - if (nread < 0) { - LDBG(curlun, "error in file read: %d\n", - (int) nread); - nread = 0; - } else if (nread < amount) { - LDBG(curlun, "partial file read: %d/%u\n", - (int) nread, amount); - nread -= (nread & 511); /* Round down to a block */ - } - file_offset += nread; - amount_left -= nread; - fsg->residue -= nread; - bh->inreq->length = nread; - bh->state = BUF_STATE_FULL; - - /* If an error occurred, report it and its position */ - if (nread < amount) { - curlun->sense_data = SS_UNRECOVERED_READ_ERROR; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - break; - } - - if (amount_left == 0) - break; /* No more left to read */ - - /* Send this buffer and go read some more */ - start_transfer(fsg, fsg->bulk_in, bh->inreq, - &bh->inreq_busy, &bh->state); - fsg->next_buffhd_to_fill = bh->next; - } - - return -EIO; /* No default reply */ -} - - -/*-------------------------------------------------------------------------*/ - -static int do_write(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - u32 lba; - struct fsg_buffhd *bh; - int get_some_more; - u32 amount_left_to_req, amount_left_to_write; - loff_t usb_offset, file_offset, file_offset_tmp; - unsigned int amount; - unsigned int partial_page; - ssize_t nwritten; - int rc; - - if (curlun->ro) { - curlun->sense_data = SS_WRITE_PROTECTED; - return -EINVAL; - } - curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */ - - /* Get the starting Logical Block Address and check that it's - * not too big */ - if (fsg->cmnd[0] == SC_WRITE_6) - lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]); - else { - lba = get_be32(&fsg->cmnd[2]); - - /* We allow DPO (Disable Page Out = don't save data in the - * cache) and FUA (Force Unit Access = write directly to the - * medium). We don't implement DPO; we implement FUA by - * performing synchronous output. */ - if ((fsg->cmnd[1] & ~0x18) != 0) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - if (fsg->cmnd[1] & 0x08) /* FUA */ - curlun->filp->f_flags |= O_SYNC; - } - if (lba >= curlun->num_sectors) { - curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - return -EINVAL; - } - - /* Carry out the file writes */ - get_some_more = 1; - file_offset = usb_offset = ((loff_t) lba) << 9; - amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd; - - while (amount_left_to_write > 0) { - - /* Queue a request for more data from the host */ - bh = fsg->next_buffhd_to_fill; - if (bh->state == BUF_STATE_EMPTY && get_some_more) { - - /* Figure out how much we want to get: - * Try to get the remaining amount. - * But don't get more than the buffer size. - * And don't try to go past the end of the file. - * If we're not at a page boundary, - * don't go past the next page. - * If this means getting 0, then we were asked - * to write past the end of file. - * Finally, round down to a block boundary. */ - amount = min(amount_left_to_req, (u32)fsg->buf_size); - amount = min((loff_t) amount, curlun->file_length - - usb_offset); - partial_page = usb_offset & (PAGE_CACHE_SIZE - 1); - if (partial_page > 0) - amount = min(amount, - (unsigned int) PAGE_CACHE_SIZE - partial_page); - - if (amount == 0) { - get_some_more = 0; - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = usb_offset >> 9; - curlun->info_valid = 1; - continue; - } - amount -= (amount & 511); - if (amount == 0) { - - /* Why were we were asked to transfer a - * partial block? */ - get_some_more = 0; - continue; - } - - /* Get the next buffer */ - usb_offset += amount; - fsg->usb_amount_left -= amount; - amount_left_to_req -= amount; - if (amount_left_to_req == 0) - get_some_more = 0; - - /* amount is always divisible by 512, hence by - * the bulk-out maxpacket size */ - bh->outreq->length = bh->bulk_out_intended_length = - amount; - start_transfer(fsg, fsg->bulk_out, bh->outreq, - &bh->outreq_busy, &bh->state); - fsg->next_buffhd_to_fill = bh->next; - continue; - } - - /* Write the received data to the backing file */ - bh = fsg->next_buffhd_to_drain; - 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; - - /* Did something go wrong with the transfer? */ - if (bh->outreq->status != 0) { - curlun->sense_data = SS_COMMUNICATION_FAILURE; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - break; - } - - amount = bh->outreq->actual; - if (curlun->file_length - file_offset < amount) { - LERROR(curlun, - "write %u @ %llu beyond end %llu\n", - amount, (unsigned long long) file_offset, - (unsigned long long) curlun->file_length); - amount = curlun->file_length - file_offset; - } - - /* Perform the write */ - file_offset_tmp = file_offset; - nwritten = vfs_write(curlun->filp, - (char __user *) bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file write %u @ %llu -> %d\n", amount, - (unsigned long long) file_offset, - (int) nwritten); - if (signal_pending(current)) - return -EINTR; /* Interrupted! */ - - if (nwritten < 0) { - LDBG(curlun, "error in file write: %d\n", - (int) nwritten); - nwritten = 0; - } else if (nwritten < amount) { - LDBG(curlun, "partial file write: %d/%u\n", - (int) nwritten, amount); - nwritten -= (nwritten & 511); - /* Round down to a block */ - } - file_offset += nwritten; - amount_left_to_write -= nwritten; - fsg->residue -= nwritten; - -#ifdef MAX_UNFLUSHED_BYTES - curlun->unflushed_bytes += nwritten; - if (curlun->unflushed_bytes >= MAX_UNFLUSHED_BYTES) { - fsync_sub(curlun); - curlun->unflushed_bytes = 0; - } -#endif - /* If an error occurred, report it and its position */ - if (nwritten < amount) { - curlun->sense_data = SS_WRITE_ERROR; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - break; - } - - /* Did the host decide to stop early? */ - if (bh->outreq->actual != bh->outreq->length) { - fsg->short_packet_received = 1; - break; - } - continue; - } - - /* Wait for something to happen */ - rc = sleep_thread(fsg); - if (rc) - return rc; - } - - return -EIO; /* No default reply */ -} - - -/*-------------------------------------------------------------------------*/ - -/* Sync the file data, don't bother with the metadata. - * The caller must own fsg->filesem. - * This code was copied from fs/buffer.c:sys_fdatasync(). */ -static int fsync_sub(struct lun *curlun) -{ - struct file *filp = curlun->filp; - struct inode *inode; - int rc, err; - - if (curlun->ro || !filp) - return 0; - if (!filp->f_op->fsync) - return -EINVAL; - - inode = filp->f_path.dentry->d_inode; - mutex_lock(&inode->i_mutex); - rc = filemap_fdatawrite(inode->i_mapping); - err = filp->f_op->fsync(filp, 1); - if (!rc) - rc = err; - err = filemap_fdatawait(inode->i_mapping); - if (!rc) - rc = err; - mutex_unlock(&inode->i_mutex); - VLDBG(curlun, "fdatasync -> %d\n", rc); - return rc; -} - -static void fsync_all(struct fsg_dev *fsg) -{ - int i; - - for (i = 0; i < fsg->nluns; ++i) - fsync_sub(&fsg->luns[i]); -} - -static int do_synchronize_cache(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - int rc; - - /* We ignore the requested LBA and write out all file's - * dirty data buffers. */ - rc = fsync_sub(curlun); - if (rc) - curlun->sense_data = SS_WRITE_ERROR; - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -static void invalidate_sub(struct lun *curlun) -{ - struct file *filp = curlun->filp; - struct inode *inode = filp->f_path.dentry->d_inode; - unsigned long rc; - - rc = invalidate_mapping_pages(inode->i_mapping, 0, -1); - VLDBG(curlun, "invalidate_inode_pages -> %ld\n", rc); -} - -static int do_verify(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - u32 lba; - u32 verification_length; - struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; - loff_t file_offset, file_offset_tmp; - u32 amount_left; - unsigned int amount; - ssize_t nread; - - /* Get the starting Logical Block Address and check that it's - * not too big */ - lba = get_be32(&fsg->cmnd[2]); - if (lba >= curlun->num_sectors) { - curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - return -EINVAL; - } - - /* We allow DPO (Disable Page Out = don't save data in the - * cache) but we don't implement it. */ - if ((fsg->cmnd[1] & ~0x10) != 0) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - verification_length = get_be16(&fsg->cmnd[7]); - if (unlikely(verification_length == 0)) - return -EIO; /* No default reply */ - - /* Prepare to carry out the file verify */ - amount_left = verification_length << 9; - file_offset = ((loff_t) lba) << 9; - - /* Write out all the dirty buffers before invalidating them */ - fsync_sub(curlun); - if (signal_pending(current)) - return -EINTR; - - invalidate_sub(curlun); - if (signal_pending(current)) - return -EINTR; - - /* Just try to read the requested blocks */ - while (amount_left > 0) { - - /* Figure out how much we need to read: - * Try to read the remaining amount, but not more than - * the buffer size. - * And don't try to read past the end of the file. - * If this means reading 0 then we were asked to read - * past the end of file. */ - amount = min((unsigned int) amount_left, - (unsigned int)fsg->buf_size); - amount = min((loff_t) amount, - curlun->file_length - file_offset); - if (amount == 0) { - curlun->sense_data = - SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - break; - } - - /* Perform the read */ - file_offset_tmp = file_offset; - nread = vfs_read(curlun->filp, - (char __user *) bh->buf, - amount, &file_offset_tmp); - VLDBG(curlun, "file read %u @ %llu -> %d\n", amount, - (unsigned long long) file_offset, - (int) nread); - if (signal_pending(current)) - return -EINTR; - - if (nread < 0) { - LDBG(curlun, "error in file verify: %d\n", - (int) nread); - nread = 0; - } else if (nread < amount) { - LDBG(curlun, "partial file verify: %d/%u\n", - (int) nread, amount); - nread -= (nread & 511); /* Round down to a sector */ - } - if (nread == 0) { - curlun->sense_data = SS_UNRECOVERED_READ_ERROR; - curlun->sense_data_info = file_offset >> 9; - curlun->info_valid = 1; - break; - } - file_offset += nread; - amount_left -= nread; - } - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -static int do_inquiry(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - u8 *buf = (u8 *) bh->buf; - - if (!fsg->curlun) { /* Unsupported LUNs are okay */ - fsg->bad_lun_okay = 1; - memset(buf, 0, 36); - buf[0] = 0x7f; /* Unsupported, no device-type */ - return 36; - } - - memset(buf, 0, 8); /* Non-removable, direct-access device */ - - buf[1] = 0x80; /* set removable bit */ - buf[2] = 2; /* ANSI SCSI level 2 */ - buf[3] = 2; /* SCSI-2 INQUIRY data format */ - buf[4] = 31; /* Additional length */ - /* No special options */ - sprintf(buf + 8, "%-8s%-16s%04x", fsg->vendor, - fsg->product, fsg->release); - return 36; -} - - -static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct lun *curlun = fsg->curlun; - u8 *buf = (u8 *) bh->buf; - u32 sd, sdinfo; - int valid; - - /* - * From the SCSI-2 spec., section 7.9 (Unit attention condition): - * - * If a REQUEST SENSE command is received from an initiator - * with a pending unit attention condition (before the target - * generates the contingent allegiance condition), then the - * target shall either: - * a) report any pending sense data and preserve the unit - * attention condition on the logical unit, or, - * b) report the unit attention condition, may discard any - * pending sense data, and clear the unit attention - * condition on the logical unit for that initiator. - * - * FSG normally uses option a); enable this code to use option b). - */ -#if 0 - if (curlun && curlun->unit_attention_data != SS_NO_SENSE) { - curlun->sense_data = curlun->unit_attention_data; - curlun->unit_attention_data = SS_NO_SENSE; - } -#endif - - if (!curlun) { /* Unsupported LUNs are okay */ - fsg->bad_lun_okay = 1; - sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; - sdinfo = 0; - valid = 0; - } else { - sd = curlun->sense_data; - sdinfo = curlun->sense_data_info; - valid = curlun->info_valid << 7; - curlun->sense_data = SS_NO_SENSE; - curlun->sense_data_info = 0; - curlun->info_valid = 0; - } - - memset(buf, 0, 18); - buf[0] = valid | 0x70; /* Valid, current error */ - buf[2] = SK(sd); - put_be32(&buf[3], sdinfo); /* Sense information */ - buf[7] = 18 - 8; /* Additional sense length */ - buf[12] = ASC(sd); - buf[13] = ASCQ(sd); - return 18; -} - - -static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct lun *curlun = fsg->curlun; - u32 lba = get_be32(&fsg->cmnd[2]); - int pmi = fsg->cmnd[8]; - u8 *buf = (u8 *) bh->buf; - - /* Check the PMI and LBA fields */ - if (pmi > 1 || (pmi == 0 && lba != 0)) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - put_be32(&buf[0], curlun->num_sectors - 1); /* Max logical block */ - put_be32(&buf[4], 512); /* Block length */ - return 8; -} - - -static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct lun *curlun = fsg->curlun; - int mscmnd = fsg->cmnd[0]; - u8 *buf = (u8 *) bh->buf; - u8 *buf0 = buf; - int pc, page_code; - int changeable_values, all_pages; - int valid_page = 0; - int len, limit; - - if ((fsg->cmnd[1] & ~0x08) != 0) { /* Mask away DBD */ - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - pc = fsg->cmnd[2] >> 6; - page_code = fsg->cmnd[2] & 0x3f; - if (pc == 3) { - curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED; - return -EINVAL; - } - changeable_values = (pc == 1); - all_pages = (page_code == 0x3f); - - /* Write the mode parameter header. Fixed values are: default - * medium type, no cache control (DPOFUA), and no block descriptors. - * The only variable value is the WriteProtect bit. We will fill in - * the mode data length later. */ - memset(buf, 0, 8); - if (mscmnd == SC_MODE_SENSE_6) { - buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ - buf += 4; - limit = 255; - } else { /* SC_MODE_SENSE_10 */ - buf[3] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */ - buf += 8; - limit = 65535; - } - - /* No block descriptors */ - - /* Disabled to workaround USB reset problems with a Vista host. - */ -#if 0 - /* The mode pages, in numerical order. The only page we support - * is the Caching page. */ - if (page_code == 0x08 || all_pages) { - valid_page = 1; - buf[0] = 0x08; /* Page code */ - buf[1] = 10; /* Page length */ - memset(buf+2, 0, 10); /* None of the fields are changeable */ - - if (!changeable_values) { - buf[2] = 0x04; /* Write cache enable, */ - /* Read cache not disabled */ - /* No cache retention priorities */ - put_be16(&buf[4], 0xffff); /* Don't disable prefetch */ - /* Minimum prefetch = 0 */ - put_be16(&buf[8], 0xffff); /* Maximum prefetch */ - /* Maximum prefetch ceiling */ - put_be16(&buf[10], 0xffff); - } - buf += 12; - } -#else - valid_page = 1; -#endif - - /* Check that a valid page was requested and the mode data length - * isn't too long. */ - len = buf - buf0; - if (!valid_page || len > limit) { - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - /* Store the mode data length */ - if (mscmnd == SC_MODE_SENSE_6) - buf0[0] = len - 1; - else - put_be16(buf0, len - 2); - return len; -} - -static int do_start_stop(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - int loej, start; - - /* int immed = fsg->cmnd[1] & 0x01; */ - loej = fsg->cmnd[4] & 0x02; - start = fsg->cmnd[4] & 0x01; - - if (loej) { - /* eject request from the host */ - if (backing_file_is_open(curlun)) { - close_backing_file(fsg, curlun); - curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; - } - } - - return 0; -} - -static int do_prevent_allow(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - int prevent; - - prevent = fsg->cmnd[4] & 0x01; - if ((fsg->cmnd[4] & ~0x01) != 0) { /* Mask away Prevent */ - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - return -EINVAL; - } - - if (curlun->prevent_medium_removal && !prevent) - fsync_sub(curlun); - curlun->prevent_medium_removal = prevent; - return 0; -} - - -static int do_read_format_capacities(struct fsg_dev *fsg, - struct fsg_buffhd *bh) -{ - struct lun *curlun = fsg->curlun; - u8 *buf = (u8 *) bh->buf; - - buf[0] = buf[1] = buf[2] = 0; - buf[3] = 8; /* Only the Current/Maximum Capacity Descriptor */ - buf += 4; - - put_be32(&buf[0], curlun->num_sectors); /* Number of blocks */ - put_be32(&buf[4], 512); /* Block length */ - buf[4] = 0x02; /* Current capacity */ - return 12; -} - - -static int do_mode_select(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct lun *curlun = fsg->curlun; - - /* We don't support MODE SELECT */ - curlun->sense_data = SS_INVALID_COMMAND; - return -EINVAL; -} - - -/*-------------------------------------------------------------------------*/ -#if 0 -static int write_zero(struct fsg_dev *fsg) -{ - struct fsg_buffhd *bh; - int rc; - - DBG(fsg, "write_zero\n"); - /* Wait for the next buffer to become available */ - bh = fsg->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(fsg); - if (rc) - return rc; - } - - bh->inreq->length = 0; - start_transfer(fsg, fsg->bulk_in, bh->inreq, - &bh->inreq_busy, &bh->state); - - fsg->next_buffhd_to_fill = bh->next; - return 0; -} -#endif - -static int throw_away_data(struct fsg_dev *fsg) -{ - struct fsg_buffhd *bh; - u32 amount; - int rc; - - DBG(fsg, "throw_away_data\n"); - while ((bh = fsg->next_buffhd_to_drain)->state != BUF_STATE_EMPTY || - fsg->usb_amount_left > 0) { - - /* 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; - - /* A short packet or an error ends everything */ - if (bh->outreq->actual != bh->outreq->length || - bh->outreq->status != 0) { - raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); - return -EINTR; - } - continue; - } - - /* Try to submit another request if we need one */ - bh = fsg->next_buffhd_to_fill; - if (bh->state == BUF_STATE_EMPTY && fsg->usb_amount_left > 0) { - amount = min(fsg->usb_amount_left, (u32) fsg->buf_size); - - /* amount is always divisible by 512, hence by - * the bulk-out maxpacket size */ - bh->outreq->length = bh->bulk_out_intended_length = - amount; - start_transfer(fsg, fsg->bulk_out, bh->outreq, - &bh->outreq_busy, &bh->state); - fsg->next_buffhd_to_fill = bh->next; - fsg->usb_amount_left -= amount; - continue; - } - - /* Otherwise wait for something to happen */ - rc = sleep_thread(fsg); - if (rc) - return rc; - } - return 0; -} - - -static int finish_reply(struct fsg_dev *fsg) -{ - struct fsg_buffhd *bh = fsg->next_buffhd_to_fill; - int rc = 0; - - switch (fsg->data_dir) { - case DATA_DIR_NONE: - break; /* Nothing to send */ - - case DATA_DIR_UNKNOWN: - rc = -EINVAL; - break; - - /* All but the last buffer of data must have already been sent */ - case DATA_DIR_TO_HOST: - if (fsg->data_size == 0) - ; /* Nothing to send */ - - /* If there's no residue, simply send the last buffer */ - else if (fsg->residue == 0) { - start_transfer(fsg, fsg->bulk_in, bh->inreq, - &bh->inreq_busy, &bh->state); - fsg->next_buffhd_to_fill = bh->next; - } else { - start_transfer(fsg, fsg->bulk_in, bh->inreq, - &bh->inreq_busy, &bh->state); - fsg->next_buffhd_to_fill = bh->next; -#if 0 - /* this is unnecessary, and was causing problems with MacOS */ - if (bh->inreq->length > 0) - write_zero(fsg); -#endif - } - break; - - /* We have processed all we want from the data the host has sent. - * There may still be outstanding bulk-out requests. */ - case DATA_DIR_FROM_HOST: - if (fsg->residue == 0) - ; /* Nothing to receive */ - - /* Did the host stop sending unexpectedly early? */ - else if (fsg->short_packet_received) { - raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); - rc = -EINTR; - } - - /* We haven't processed all the incoming data. Even though - * we may be allowed to stall, doing so would cause a race. - * The controller may already have ACK'ed all the remaining - * bulk-out packets, in which case the host wouldn't see a - * STALL. Not realizing the endpoint was halted, it wouldn't - * clear the halt -- leading to problems later on. */ -#if 0 - fsg_set_halt(fsg, fsg->bulk_out); - raise_exception(fsg, FSG_STATE_ABORT_BULK_OUT); - rc = -EINTR; -#endif - - /* We can't stall. Read in the excess data and throw it - * all away. */ - else - rc = throw_away_data(fsg); - break; - } - return rc; -} - - -static int send_status(struct fsg_dev *fsg) -{ - struct lun *curlun = fsg->curlun; - struct fsg_buffhd *bh; - int rc; - u8 status = USB_STATUS_PASS; - u32 sd, sdinfo = 0; - struct bulk_cs_wrap *csw; - - DBG(fsg, "send_status\n"); - /* Wait for the next buffer to become available */ - bh = fsg->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(fsg); - if (rc) - return rc; - } - - if (curlun) { - sd = curlun->sense_data; - sdinfo = curlun->sense_data_info; - } else if (fsg->bad_lun_okay) - sd = SS_NO_SENSE; - else - sd = SS_LOGICAL_UNIT_NOT_SUPPORTED; - - if (fsg->phase_error) { - DBG(fsg, "sending phase-error status\n"); - status = USB_STATUS_PHASE_ERROR; - sd = SS_INVALID_COMMAND; - } else if (sd != SS_NO_SENSE) { - DBG(fsg, "sending command-failure status\n"); - status = USB_STATUS_FAIL; - VDBG(fsg, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;" - " info x%x\n", - SK(sd), ASC(sd), ASCQ(sd), sdinfo); - } - - csw = bh->buf; - - /* Store and send the Bulk-only CSW */ - csw->Signature = __constant_cpu_to_le32(USB_BULK_CS_SIG); - csw->Tag = fsg->tag; - csw->Residue = cpu_to_le32(fsg->residue); - csw->Status = status; - - bh->inreq->length = USB_BULK_CS_WRAP_LEN; - start_transfer(fsg, fsg->bulk_in, bh->inreq, - &bh->inreq_busy, &bh->state); - - fsg->next_buffhd_to_fill = bh->next; - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -/* Check whether the command is properly formed and whether its data size - * and direction agree with the values we already have. */ -static int check_command(struct fsg_dev *fsg, int cmnd_size, - enum data_direction data_dir, unsigned int mask, - int needs_medium, const char *name) -{ - int i; - int lun = fsg->cmnd[1] >> 5; - static const char dirletter[4] = {'u', 'o', 'i', 'n'}; - char hdlen[20]; - struct lun *curlun; - - hdlen[0] = 0; - if (fsg->data_dir != DATA_DIR_UNKNOWN) - sprintf(hdlen, ", H%c=%u", dirletter[(int) fsg->data_dir], - fsg->data_size); - VDBG(fsg, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n", - name, cmnd_size, dirletter[(int) data_dir], - fsg->data_size_from_cmnd, fsg->cmnd_size, hdlen); - - /* We can't reply at all until we know the correct data direction - * and size. */ - if (fsg->data_size_from_cmnd == 0) - data_dir = DATA_DIR_NONE; - if (fsg->data_dir == DATA_DIR_UNKNOWN) { /* CB or CBI */ - fsg->data_dir = data_dir; - fsg->data_size = fsg->data_size_from_cmnd; - - } else { /* Bulk-only */ - if (fsg->data_size < fsg->data_size_from_cmnd) { - - /* Host data size < Device data size is a phase error. - * Carry out the command, but only transfer as much - * as we are allowed. */ - DBG(fsg, "phase error 1\n"); - fsg->data_size_from_cmnd = fsg->data_size; - fsg->phase_error = 1; - } - } - fsg->residue = fsg->usb_amount_left = fsg->data_size; - - /* Conflicting data directions is a phase error */ - if (fsg->data_dir != data_dir && fsg->data_size_from_cmnd > 0) { - fsg->phase_error = 1; - DBG(fsg, "phase error 2\n"); - return -EINVAL; - } - - /* Verify the length of the command itself */ - if (cmnd_size != fsg->cmnd_size) { - - /* Special case workaround: MS-Windows issues REQUEST_SENSE - * and INQUIRY commands with cbw->Length == 12 (it should be 6). */ - if ((fsg->cmnd[0] == SC_REQUEST_SENSE && fsg->cmnd_size == 12) - || (fsg->cmnd[0] == SC_INQUIRY && fsg->cmnd_size == 12)) - cmnd_size = fsg->cmnd_size; - else { - fsg->phase_error = 1; - return -EINVAL; - } - } - - /* Check that the LUN values are consistent */ - if (fsg->lun != lun) - DBG(fsg, "using LUN %d from CBW, " - "not LUN %d from CDB\n", - fsg->lun, lun); - - /* Check the LUN */ - if (fsg->lun >= 0 && fsg->lun < fsg->nluns) { - fsg->curlun = curlun = &fsg->luns[fsg->lun]; - if (fsg->cmnd[0] != SC_REQUEST_SENSE) { - curlun->sense_data = SS_NO_SENSE; - curlun->sense_data_info = 0; - curlun->info_valid = 0; - } - } else { - fsg->curlun = curlun = NULL; - fsg->bad_lun_okay = 0; - - /* INQUIRY and REQUEST SENSE commands are explicitly allowed - * to use unsupported LUNs; all others may not. */ - if (fsg->cmnd[0] != SC_INQUIRY && - fsg->cmnd[0] != SC_REQUEST_SENSE) { - DBG(fsg, "unsupported LUN %d\n", fsg->lun); - return -EINVAL; - } - } - - /* If a unit attention condition exists, only INQUIRY and - * REQUEST SENSE commands are allowed; anything else must fail. */ - if (curlun && curlun->unit_attention_data != SS_NO_SENSE && - fsg->cmnd[0] != SC_INQUIRY && - fsg->cmnd[0] != SC_REQUEST_SENSE) { - curlun->sense_data = curlun->unit_attention_data; - curlun->unit_attention_data = SS_NO_SENSE; - return -EINVAL; - } - - /* Check that only command bytes listed in the mask are non-zero */ - fsg->cmnd[1] &= 0x1f; /* Mask away the LUN */ - for (i = 1; i < cmnd_size; ++i) { - if (fsg->cmnd[i] && !(mask & (1 << i))) { - if (curlun) - curlun->sense_data = SS_INVALID_FIELD_IN_CDB; - DBG(fsg, "SS_INVALID_FIELD_IN_CDB\n"); - return -EINVAL; - } - } - - /* If the medium isn't mounted and the command needs to access - * it, return an error. */ - if (curlun && !backing_file_is_open(curlun) && needs_medium) { - curlun->sense_data = SS_MEDIUM_NOT_PRESENT; - DBG(fsg, "SS_MEDIUM_NOT_PRESENT\n"); - return -EINVAL; - } - - return 0; -} - - -static int do_scsi_command(struct fsg_dev *fsg) -{ - struct fsg_buffhd *bh; - int rc; - int reply = -EINVAL; - int i; - static char unknown[16]; - - dump_cdb(fsg); - - /* Wait for the next buffer to become available for data or status */ - bh = fsg->next_buffhd_to_drain = fsg->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(fsg); - if (rc) - return rc; - } - fsg->phase_error = 0; - fsg->short_packet_received = 0; - - down_read(&fsg->filesem); /* We're using the backing file */ - switch (fsg->cmnd[0]) { - - case SC_INQUIRY: - fsg->data_size_from_cmnd = fsg->cmnd[4]; - if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, - (1<<4), 0, - "INQUIRY")) == 0) - reply = do_inquiry(fsg, bh); - break; - - case SC_MODE_SELECT_6: - fsg->data_size_from_cmnd = fsg->cmnd[4]; - if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, - (1<<1) | (1<<4), 0, - "MODE SELECT(6)")) == 0) - reply = do_mode_select(fsg, bh); - break; - - case SC_MODE_SELECT_10: - fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); - if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, - (1<<1) | (3<<7), 0, - "MODE SELECT(10)")) == 0) - reply = do_mode_select(fsg, bh); - break; - - case SC_MODE_SENSE_6: - fsg->data_size_from_cmnd = fsg->cmnd[4]; - if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, - (1<<1) | (1<<2) | (1<<4), 0, - "MODE SENSE(6)")) == 0) - reply = do_mode_sense(fsg, bh); - break; - - case SC_MODE_SENSE_10: - fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); - if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, - (1<<1) | (1<<2) | (3<<7), 0, - "MODE SENSE(10)")) == 0) - reply = do_mode_sense(fsg, bh); - break; - - case SC_PREVENT_ALLOW_MEDIUM_REMOVAL: - fsg->data_size_from_cmnd = 0; - if ((reply = check_command(fsg, 6, DATA_DIR_NONE, - (1<<4), 0, - "PREVENT-ALLOW MEDIUM REMOVAL")) == 0) - reply = do_prevent_allow(fsg); - break; - - case SC_READ_6: - i = fsg->cmnd[4]; - fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; - if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, - (7<<1) | (1<<4), 1, - "READ(6)")) == 0) - reply = do_read(fsg); - break; - - case SC_READ_10: - fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9; - if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, - (1<<1) | (0xf<<2) | (3<<7), 1, - "READ(10)")) == 0) - reply = do_read(fsg); - break; - - case SC_READ_12: - fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9; - if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST, - (1<<1) | (0xf<<2) | (0xf<<6), 1, - "READ(12)")) == 0) - reply = do_read(fsg); - break; - - case SC_READ_CAPACITY: - fsg->data_size_from_cmnd = 8; - if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, - (0xf<<2) | (1<<8), 1, - "READ CAPACITY")) == 0) - reply = do_read_capacity(fsg, bh); - break; - - case SC_READ_FORMAT_CAPACITIES: - fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]); - if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST, - (3<<7), 1, - "READ FORMAT CAPACITIES")) == 0) - reply = do_read_format_capacities(fsg, bh); - break; - - case SC_REQUEST_SENSE: - fsg->data_size_from_cmnd = fsg->cmnd[4]; - if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST, - (1<<4), 0, - "REQUEST SENSE")) == 0) - reply = do_request_sense(fsg, bh); - break; - - case SC_START_STOP_UNIT: - fsg->data_size_from_cmnd = 0; - if ((reply = check_command(fsg, 6, DATA_DIR_NONE, - (1<<1) | (1<<4), 0, - "START-STOP UNIT")) == 0) - reply = do_start_stop(fsg); - break; - - case SC_SYNCHRONIZE_CACHE: - fsg->data_size_from_cmnd = 0; - if ((reply = check_command(fsg, 10, DATA_DIR_NONE, - (0xf<<2) | (3<<7), 1, - "SYNCHRONIZE CACHE")) == 0) - reply = do_synchronize_cache(fsg); - break; - - case SC_TEST_UNIT_READY: - fsg->data_size_from_cmnd = 0; - reply = check_command(fsg, 6, DATA_DIR_NONE, - 0, 1, - "TEST UNIT READY"); - break; - - /* Although optional, this command is used by MS-Windows. We - * support a minimal version: BytChk must be 0. */ - case SC_VERIFY: - fsg->data_size_from_cmnd = 0; - if ((reply = check_command(fsg, 10, DATA_DIR_NONE, - (1<<1) | (0xf<<2) | (3<<7), 1, - "VERIFY")) == 0) - reply = do_verify(fsg); - break; - - case SC_WRITE_6: - i = fsg->cmnd[4]; - fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9; - if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST, - (7<<1) | (1<<4), 1, - "WRITE(6)")) == 0) - reply = do_write(fsg); - break; - - case SC_WRITE_10: - fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9; - if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST, - (1<<1) | (0xf<<2) | (3<<7), 1, - "WRITE(10)")) == 0) - reply = do_write(fsg); - break; - - case SC_WRITE_12: - fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9; - if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST, - (1<<1) | (0xf<<2) | (0xf<<6), 1, - "WRITE(12)")) == 0) - reply = do_write(fsg); - break; - - /* Some mandatory commands that we recognize but don't implement. - * They don't mean much in this setting. It's left as an exercise - * for anyone interested to implement RESERVE and RELEASE in terms - * of Posix locks. */ - case SC_FORMAT_UNIT: - case SC_RELEASE: - case SC_RESERVE: - case SC_SEND_DIAGNOSTIC: - /* Fall through */ - - default: - fsg->data_size_from_cmnd = 0; - sprintf(unknown, "Unknown x%02x", fsg->cmnd[0]); - if ((reply = check_command(fsg, fsg->cmnd_size, - DATA_DIR_UNKNOWN, 0xff, 0, unknown)) == 0) { - fsg->curlun->sense_data = SS_INVALID_COMMAND; - reply = -EINVAL; - } - break; - } - up_read(&fsg->filesem); - - VDBG(fsg, "reply: %d, fsg->data_size_from_cmnd: %d\n", - reply, fsg->data_size_from_cmnd); - if (reply == -EINTR || signal_pending(current)) - return -EINTR; - - /* Set up the single reply buffer for finish_reply() */ - if (reply == -EINVAL) - reply = 0; /* Error reply length */ - if (reply >= 0 && fsg->data_dir == DATA_DIR_TO_HOST) { - reply = min((u32) reply, fsg->data_size_from_cmnd); - bh->inreq->length = reply; - bh->state = BUF_STATE_FULL; - fsg->residue -= reply; - } /* Otherwise it's already set */ - - return 0; -} - - -/*-------------------------------------------------------------------------*/ - -static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh) -{ - struct usb_request *req = bh->outreq; - struct bulk_cb_wrap *cbw = req->buf; - - /* Was this a real packet? */ - if (req->status) - return -EINVAL; - - /* Is the CBW valid? */ - if (req->actual != USB_BULK_CB_WRAP_LEN || - cbw->Signature != __constant_cpu_to_le32( - USB_BULK_CB_SIG)) { - DBG(fsg, "invalid CBW: len %u sig 0x%x\n", - req->actual, - le32_to_cpu(cbw->Signature)); - return -EINVAL; - } - - /* Is the CBW meaningful? */ - if (cbw->Lun >= MAX_LUNS || cbw->Flags & ~USB_BULK_IN_FLAG || - cbw->Length <= 0 || cbw->Length > MAX_COMMAND_SIZE) { - DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, " - "cmdlen %u\n", - cbw->Lun, cbw->Flags, cbw->Length); - return -EINVAL; - } - - /* Save the command for later */ - fsg->cmnd_size = cbw->Length; - memcpy(fsg->cmnd, cbw->CDB, fsg->cmnd_size); - if (cbw->Flags & USB_BULK_IN_FLAG) - fsg->data_dir = DATA_DIR_TO_HOST; - else - fsg->data_dir = DATA_DIR_FROM_HOST; - fsg->data_size = le32_to_cpu(cbw->DataTransferLength); - if (fsg->data_size == 0) - fsg->data_dir = DATA_DIR_NONE; - fsg->lun = cbw->Lun; - fsg->tag = cbw->Tag; - return 0; -} - - -static int get_next_command(struct fsg_dev *fsg) -{ - struct fsg_buffhd *bh; - int rc = 0; - - /* Wait for the next buffer to become available */ - bh = fsg->next_buffhd_to_fill; - while (bh->state != BUF_STATE_EMPTY) { - rc = sleep_thread(fsg); - if (rc) { - usb_ep_dequeue(fsg->bulk_out, bh->outreq); - bh->outreq_busy = 0; - bh->state = BUF_STATE_EMPTY; - return rc; - } - } - - /* Queue a request to read a Bulk-only CBW */ - set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); - start_transfer(fsg, fsg->bulk_out, bh->outreq, - &bh->outreq_busy, &bh->state); - - /* We will drain the buffer in software, which means we - * can reuse it for the next filling. No need to advance - * next_buffhd_to_fill. */ - - /* Wait for the CBW to arrive */ - while (bh->state != BUF_STATE_FULL) { - rc = sleep_thread(fsg); - if (rc) { - usb_ep_dequeue(fsg->bulk_out, bh->outreq); - bh->outreq_busy = 0; - bh->state = BUF_STATE_EMPTY; - return rc; - } - } - smp_rmb(); - rc = received_cbw(fsg, bh); - bh->state = BUF_STATE_EMPTY; - - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -static int enable_endpoint(struct fsg_dev *fsg, struct usb_ep *ep, - const struct usb_endpoint_descriptor *d) -{ - int rc; - - DBG(fsg, "usb_ep_enable %s\n", ep->name); - ep->driver_data = fsg; - rc = usb_ep_enable(ep, d); - if (rc) - ERROR(fsg, "can't enable %s, result %d\n", ep->name, rc); - return rc; -} - -static int alloc_request(struct fsg_dev *fsg, struct usb_ep *ep, - struct usb_request **preq) -{ - *preq = usb_ep_alloc_request(ep, GFP_ATOMIC); - if (*preq) - return 0; - ERROR(fsg, "can't allocate request for %s\n", ep->name); - return -ENOMEM; -} - -/* - * Reset interface setting and re-init endpoint state (toggle etc). - * Call with altsetting < 0 to disable the interface. The only other - * available altsetting is 0, which enables the interface. - */ -static int do_set_interface(struct fsg_dev *fsg, int altsetting) -{ - struct usb_composite_dev *cdev = fsg->cdev; - int rc = 0; - int i; - const struct usb_endpoint_descriptor *d; - - if (fsg->running) - DBG(fsg, "reset interface\n"); -reset: - /* Disable the endpoints */ - if (fsg->bulk_in_enabled) { - DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_in->name); - usb_ep_disable(fsg->bulk_in); - fsg->bulk_in_enabled = 0; - } - if (fsg->bulk_out_enabled) { - DBG(fsg, "usb_ep_disable %s\n", fsg->bulk_out->name); - usb_ep_disable(fsg->bulk_out); - fsg->bulk_out_enabled = 0; - } - - /* Deallocate the requests */ - for (i = 0; i < NUM_BUFFERS; ++i) { - struct fsg_buffhd *bh = &fsg->buffhds[i]; - if (bh->inreq) { - usb_ep_free_request(fsg->bulk_in, bh->inreq); - bh->inreq = NULL; - } - if (bh->outreq) { - usb_ep_free_request(fsg->bulk_out, bh->outreq); - bh->outreq = NULL; - } - } - - - fsg->running = 0; - if (altsetting < 0 || rc != 0) - return rc; - - DBG(fsg, "set interface %d\n", altsetting); - - /* Enable the endpoints */ - d = ep_desc(cdev->gadget, &fs_bulk_in_desc, &hs_bulk_in_desc); - if ((rc = enable_endpoint(fsg, fsg->bulk_in, d)) != 0) - goto reset; - fsg->bulk_in_enabled = 1; - - d = ep_desc(cdev->gadget, &fs_bulk_out_desc, &hs_bulk_out_desc); - if ((rc = enable_endpoint(fsg, fsg->bulk_out, d)) != 0) - goto reset; - fsg->bulk_out_enabled = 1; - fsg->bulk_out_maxpacket = le16_to_cpu(d->wMaxPacketSize); - - /* Allocate the requests */ - for (i = 0; i < NUM_BUFFERS; ++i) { - struct fsg_buffhd *bh = &fsg->buffhds[i]; - - rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq); - if (rc != 0) - goto reset; - rc = alloc_request(fsg, fsg->bulk_out, &bh->outreq); - if (rc != 0) - goto reset; - bh->inreq->buf = bh->outreq->buf = bh->buf; - bh->inreq->context = bh->outreq->context = bh; - bh->inreq->complete = bulk_in_complete; - bh->outreq->complete = bulk_out_complete; - } - - fsg->running = 1; - for (i = 0; i < fsg->nluns; ++i) - fsg->luns[i].unit_attention_data = SS_RESET_OCCURRED; - - return rc; -} - -static void adjust_wake_lock(struct fsg_dev *fsg) -{ - int ums_active = 0; - int i; - unsigned long flags; - - spin_lock_irqsave(&fsg->lock, flags); - - if (fsg->config) { - for (i = 0; i < fsg->nluns; ++i) { - if (backing_file_is_open(&fsg->luns[i])) - ums_active = 1; - } - } - - if (ums_active) - wake_lock(&fsg->wake_lock); - else - wake_unlock(&fsg->wake_lock); - - spin_unlock_irqrestore(&fsg->lock, flags); -} - -/* - * Change our operational configuration. This code must agree with the code - * that returns config descriptors, and with interface altsetting code. - * - * It's also responsible for power management interactions. Some - * configurations might not work with our current power sources. - * For now we just assume the gadget is always self-powered. - */ -static int do_set_config(struct fsg_dev *fsg, u8 new_config) -{ - int rc = 0; - - /* Disable the single interface */ - if (fsg->config != 0) { - DBG(fsg, "reset config\n"); - fsg->config = 0; - rc = do_set_interface(fsg, -1); - } - - /* Enable the interface */ - if (new_config != 0) { - fsg->config = new_config; - if ((rc = do_set_interface(fsg, 0)) != 0) - fsg->config = 0; // Reset on errors - } - - switch_set_state(&fsg->sdev, new_config); - adjust_wake_lock(fsg); - return rc; -} - - -/*-------------------------------------------------------------------------*/ - -static void handle_exception(struct fsg_dev *fsg) -{ - siginfo_t info; - int sig; - int i; - int num_active; - struct fsg_buffhd *bh; - enum fsg_state old_state; - u8 new_config; - struct lun *curlun; - int rc; - unsigned long flags; - - DBG(fsg, "handle_exception state: %d\n", (int)fsg->state); - /* Clear the existing signals. Anything but SIGUSR1 is converted - * into a high-priority EXIT exception. */ - for (;;) { - sig = dequeue_signal_lock(current, ¤t->blocked, &info); - if (!sig) - break; - if (sig != SIGUSR1) { - if (fsg->state < FSG_STATE_EXIT) - DBG(fsg, "Main thread exiting on signal\n"); - raise_exception(fsg, FSG_STATE_EXIT); - } - } - - /* Cancel all the pending transfers */ - for (i = 0; i < NUM_BUFFERS; ++i) { - bh = &fsg->buffhds[i]; - if (bh->inreq_busy) - usb_ep_dequeue(fsg->bulk_in, bh->inreq); - if (bh->outreq_busy) - usb_ep_dequeue(fsg->bulk_out, bh->outreq); - } - - /* Wait until everything is idle */ - for (;;) { - num_active = 0; - for (i = 0; i < NUM_BUFFERS; ++i) { - bh = &fsg->buffhds[i]; - num_active += bh->outreq_busy; - } - if (num_active == 0) - break; - if (sleep_thread(fsg)) - return; - } - - /* - * Do NOT flush the fifo after set_interface() - * Otherwise, it results in some data being lost - */ - if ((fsg->state != FSG_STATE_CONFIG_CHANGE) || - (fsg->new_config != 1)) { - /* Clear out the controller's fifos */ - if (fsg->bulk_in_enabled) - usb_ep_fifo_flush(fsg->bulk_in); - if (fsg->bulk_out_enabled) - usb_ep_fifo_flush(fsg->bulk_out); - } - /* Reset the I/O buffer states and pointers, the SCSI - * state, and the exception. Then invoke the handler. */ - spin_lock_irqsave(&fsg->lock, flags); - - for (i = 0; i < NUM_BUFFERS; ++i) { - bh = &fsg->buffhds[i]; - bh->state = BUF_STATE_EMPTY; - } - fsg->next_buffhd_to_fill = fsg->next_buffhd_to_drain = - &fsg->buffhds[0]; - - new_config = fsg->new_config; - old_state = fsg->state; - - if (old_state == FSG_STATE_ABORT_BULK_OUT) - fsg->state = FSG_STATE_STATUS_PHASE; - else { - for (i = 0; i < fsg->nluns; ++i) { - curlun = &fsg->luns[i]; - curlun->prevent_medium_removal = 0; - curlun->sense_data = curlun->unit_attention_data = - SS_NO_SENSE; - curlun->sense_data_info = 0; - curlun->info_valid = 0; - } - fsg->state = FSG_STATE_IDLE; - } - spin_unlock_irqrestore(&fsg->lock, flags); - - /* Carry out any extra actions required for the exception */ - switch (old_state) { - default: - break; - - case FSG_STATE_ABORT_BULK_OUT: - DBG(fsg, "FSG_STATE_ABORT_BULK_OUT\n"); - spin_lock_irqsave(&fsg->lock, flags); - if (fsg->state == FSG_STATE_STATUS_PHASE) - fsg->state = FSG_STATE_IDLE; - spin_unlock_irqrestore(&fsg->lock, flags); - break; - - case FSG_STATE_RESET: - /* really not much to do here */ - break; - - case FSG_STATE_CONFIG_CHANGE: - rc = do_set_config(fsg, new_config); - if (new_config == 0) { - /* We're using the backing file */ - down_read(&fsg->filesem); - fsync_all(fsg); - up_read(&fsg->filesem); - } - break; - - case FSG_STATE_EXIT: - case FSG_STATE_TERMINATED: - do_set_config(fsg, 0); /* Free resources */ - spin_lock_irqsave(&fsg->lock, flags); - fsg->state = FSG_STATE_TERMINATED; /* Stop the thread */ - spin_unlock_irqrestore(&fsg->lock, flags); - break; - } -} - - -/*-------------------------------------------------------------------------*/ - -static int fsg_main_thread(void *fsg_) -{ - struct fsg_dev *fsg = fsg_; - unsigned long flags; - - /* Allow the thread to be killed by a signal, but set the signal mask - * to block everything but INT, TERM, KILL, and USR1. */ - allow_signal(SIGINT); - allow_signal(SIGTERM); - allow_signal(SIGKILL); - allow_signal(SIGUSR1); - - /* Allow the thread to be frozen */ - set_freezable(); - - /* Arrange for userspace references to be interpreted as kernel - * pointers. That way we can pass a kernel pointer to a routine - * that expects a __user pointer and it will work okay. */ - set_fs(get_ds()); - - /* The main loop */ - while (fsg->state != FSG_STATE_TERMINATED) { - if (exception_in_progress(fsg) || signal_pending(current)) { - handle_exception(fsg); - continue; - } - - if (!fsg->running) { - sleep_thread(fsg); - continue; - } - - if (get_next_command(fsg)) - continue; - - spin_lock_irqsave(&fsg->lock, flags); - if (!exception_in_progress(fsg)) - fsg->state = FSG_STATE_DATA_PHASE; - spin_unlock_irqrestore(&fsg->lock, flags); - - if (do_scsi_command(fsg) || finish_reply(fsg)) - continue; - - spin_lock_irqsave(&fsg->lock, flags); - if (!exception_in_progress(fsg)) - fsg->state = FSG_STATE_STATUS_PHASE; - spin_unlock_irqrestore(&fsg->lock, flags); - - if (send_status(fsg)) - continue; - - spin_lock_irqsave(&fsg->lock, flags); - if (!exception_in_progress(fsg)) - fsg->state = FSG_STATE_IDLE; - spin_unlock_irqrestore(&fsg->lock, flags); - } - - spin_lock_irqsave(&fsg->lock, flags); - fsg->thread_task = NULL; - spin_unlock_irqrestore(&fsg->lock, flags); - - /* In case we are exiting because of a signal, unregister the - * gadget driver and close the backing file. */ - if (test_and_clear_bit(REGISTERED, &fsg->atomic_bitflags)) - close_all_backing_files(fsg); - - /* Let the unbind and cleanup routines know the thread has exited */ - complete_and_exit(&fsg->thread_notifier, 0); -} - - -/*-------------------------------------------------------------------------*/ - -/* 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 fsg_dev *fsg, 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; - - /* 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 sectors */ - if (num_sectors == 0) { - 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->unflushed_bytes = 0; - curlun->num_sectors = num_sectors; - LDBG(curlun, "open backing file: %s size: %lld num_sectors: %lld\n", - filename, size, num_sectors); - rc = 0; - adjust_wake_lock(fsg); - -out: - filp_close(filp, current->files); - return rc; -} - - -static void close_backing_file(struct fsg_dev *fsg, struct lun *curlun) -{ - if (curlun->filp) { - int rc; - - /* - * XXX: San: Ugly hack here added to ensure that - * our pages get synced to disk. - * Also drop caches here just to be extra-safe - */ - rc = vfs_fsync(curlun->filp, 1); - if (rc < 0) - printk(KERN_ERR "ums: Error syncing data (%d)\n", rc); - /* drop_pagecache and drop_slab are no longer available */ - /* drop_pagecache(); */ - /* drop_slab(); */ - - LDBG(curlun, "close backing file\n"); - fput(curlun->filp); - curlun->filp = NULL; - adjust_wake_lock(fsg); - } -} - -static void close_all_backing_files(struct fsg_dev *fsg) -{ - int i; - - for (i = 0; i < fsg->nluns; ++i) - close_backing_file(fsg, &fsg->luns[i]); -} - -static ssize_t show_file(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct lun *curlun = dev_to_lun(dev); - struct fsg_dev *fsg = dev_get_drvdata(dev); - char *p; - ssize_t rc; - - down_read(&fsg->filesem); - if (backing_file_is_open(curlun)) { /* Get the complete pathname */ - p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1); - if (IS_ERR(p)) - rc = PTR_ERR(p); - else { - rc = strlen(p); - memmove(buf, p, rc); - buf[rc] = '\n'; /* Add a newline */ - buf[++rc] = 0; - } - } else { /* No file, return 0 bytes */ - *buf = 0; - rc = 0; - } - up_read(&fsg->filesem); - return rc; -} - -static ssize_t store_file(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct lun *curlun = dev_to_lun(dev); - struct fsg_dev *fsg = dev_get_drvdata(dev); - int rc = 0; - - DBG(fsg, "store_file: \"%s\"\n", buf); -#if 0 - /* disabled because we need to allow closing the backing file if the media was removed */ - if (curlun->prevent_medium_removal && backing_file_is_open(curlun)) { - LDBG(curlun, "eject attempt prevented\n"); - return -EBUSY; /* "Door is locked" */ - } -#endif - - /* Remove a trailing newline */ - if (count > 0 && buf[count-1] == '\n') - ((char *) buf)[count-1] = 0; - - /* Eject current medium */ - down_write(&fsg->filesem); - if (backing_file_is_open(curlun)) { - close_backing_file(fsg, curlun); - curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; - } - - /* Load new medium */ - if (count > 0 && buf[0]) { - rc = open_backing_file(fsg, curlun, buf); - if (rc == 0) - curlun->unit_attention_data = - SS_NOT_READY_TO_READY_TRANSITION; - } - up_write(&fsg->filesem); - return (rc < 0 ? rc : count); -} - - -static DEVICE_ATTR(file, 0444, show_file, store_file); - -/*-------------------------------------------------------------------------*/ - -static void fsg_release(struct kref *ref) -{ - struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref); - - kfree(fsg->luns); - kfree(fsg); -} - -static void lun_release(struct device *dev) -{ - struct fsg_dev *fsg = dev_get_drvdata(dev); - - kref_put(&fsg->ref, fsg_release); -} - - -/*-------------------------------------------------------------------------*/ - -static int __init fsg_alloc(void) -{ - struct fsg_dev *fsg; - - fsg = kzalloc(sizeof *fsg, GFP_KERNEL); - if (!fsg) - return -ENOMEM; - spin_lock_init(&fsg->lock); - init_rwsem(&fsg->filesem); - kref_init(&fsg->ref); - init_completion(&fsg->thread_notifier); - - the_fsg = fsg; - return 0; -} - -static ssize_t print_switch_name(struct switch_dev *sdev, char *buf) -{ - return sprintf(buf, "%s\n", DRIVER_NAME); -} - -static ssize_t print_switch_state(struct switch_dev *sdev, char *buf) -{ - struct fsg_dev *fsg = container_of(sdev, struct fsg_dev, sdev); - return sprintf(buf, "%s\n", (fsg->config ? "online" : "offline")); -} - -static void -fsg_function_unbind(struct usb_configuration *c, struct usb_function *f) -{ - struct fsg_dev *fsg = func_to_dev(f); - int i; - struct lun *curlun; - - DBG(fsg, "fsg_function_unbind\n"); - clear_bit(REGISTERED, &fsg->atomic_bitflags); - - /* Unregister the sysfs attribute files and the LUNs */ - for (i = 0; i < fsg->nluns; ++i) { - curlun = &fsg->luns[i]; - if (curlun->registered) { - device_remove_file(&curlun->dev, &dev_attr_file); - device_unregister(&curlun->dev); - curlun->registered = 0; - } - } - - /* If the thread isn't already dead, tell it to exit now */ - if (fsg->state != FSG_STATE_TERMINATED) { - raise_exception(fsg, FSG_STATE_EXIT); - wait_for_completion(&fsg->thread_notifier); - - /* The cleanup routine waits for this completion also */ - complete(&fsg->thread_notifier); - } - - /* Free the data buffers */ - for (i = 0; i < NUM_BUFFERS; ++i) - kfree(fsg->buffhds[i].buf); - switch_dev_unregister(&fsg->sdev); -} - -static int -fsg_function_bind(struct usb_configuration *c, struct usb_function *f) -{ - struct usb_composite_dev *cdev = c->cdev; - struct fsg_dev *fsg = func_to_dev(f); - int rc; - int i; - int id; - struct lun *curlun; - struct usb_ep *ep; - char *pathbuf, *p; - - fsg->cdev = cdev; - DBG(fsg, "fsg_function_bind\n"); - - dev_attr_file.attr.mode = 0644; - - /* Find out how many LUNs there should be */ - i = fsg->nluns; - if (i == 0) - i = 1; - if (i > MAX_LUNS) { - ERROR(fsg, "invalid number of LUNs: %d\n", i); - rc = -EINVAL; - goto out; - } - - /* Create the LUNs, open their backing files, and register the - * LUN devices in sysfs. */ - fsg->luns = kzalloc(i * sizeof(struct lun), GFP_KERNEL); - if (!fsg->luns) { - rc = -ENOMEM; - goto out; - } - fsg->nluns = i; - - for (i = 0; i < fsg->nluns; ++i) { - curlun = &fsg->luns[i]; - curlun->ro = 0; - curlun->dev.release = lun_release; - /* use "usb_mass_storage" platform device as parent if available */ - if (fsg->pdev) - curlun->dev.parent = &fsg->pdev->dev; - else - curlun->dev.parent = &cdev->gadget->dev; - dev_set_drvdata(&curlun->dev, fsg); - dev_set_name(&curlun->dev,"lun%d", i); - - rc = device_register(&curlun->dev); - if (rc != 0) { - INFO(fsg, "failed to register LUN%d: %d\n", i, rc); - goto out; - } - rc = device_create_file(&curlun->dev, &dev_attr_file); - if (rc != 0) { - ERROR(fsg, "device_create_file failed: %d\n", rc); - device_unregister(&curlun->dev); - goto out; - } - curlun->registered = 1; - kref_get(&fsg->ref); - } - - /* allocate interface ID(s) */ - id = usb_interface_id(c, f); - if (id < 0) - return id; - intf_desc.bInterfaceNumber = id; - - ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_in_desc); - if (!ep) - goto autoconf_fail; - ep->driver_data = fsg; /* claim the endpoint */ - fsg->bulk_in = ep; - - ep = usb_ep_autoconfig(cdev->gadget, &fs_bulk_out_desc); - if (!ep) - goto autoconf_fail; - ep->driver_data = fsg; /* claim the endpoint */ - fsg->bulk_out = ep; - - rc = -ENOMEM; - - if (gadget_is_dualspeed(cdev->gadget)) { - /* Assume endpoint addresses are the same for both speeds */ - hs_bulk_in_desc.bEndpointAddress = - fs_bulk_in_desc.bEndpointAddress; - hs_bulk_out_desc.bEndpointAddress = - fs_bulk_out_desc.bEndpointAddress; - - f->hs_descriptors = hs_function; - } - - /* Allocate the data buffers */ - 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 = kmalloc(fsg->buf_size, GFP_KERNEL); - if (!bh->buf) - goto out; - bh->next = bh + 1; - } - fsg->buffhds[NUM_BUFFERS - 1].next = &fsg->buffhds[0]; - - fsg->thread_task = kthread_create(fsg_main_thread, fsg, - shortname); - if (IS_ERR(fsg->thread_task)) { - rc = PTR_ERR(fsg->thread_task); - ERROR(fsg, "kthread_create failed: %d\n", rc); - goto out; - } - - INFO(fsg, "Number of LUNs=%d\n", fsg->nluns); - - pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); - for (i = 0; i < fsg->nluns; ++i) { - curlun = &fsg->luns[i]; - if (backing_file_is_open(curlun)) { - p = NULL; - if (pathbuf) { - p = d_path(&curlun->filp->f_path, - pathbuf, PATH_MAX); - if (IS_ERR(p)) - p = NULL; - } - LINFO(curlun, "ro=%d, file: %s\n", - curlun->ro, (p ? p : "(error)")); - } - } - kfree(pathbuf); - - set_bit(REGISTERED, &fsg->atomic_bitflags); - - /* Tell the thread to start working */ - wake_up_process(fsg->thread_task); - return 0; - -autoconf_fail: - ERROR(fsg, "unable to autoconfigure all endpoints\n"); - rc = -ENOTSUPP; - -out: - DBG(fsg, "fsg_function_bind failed: %d\n", rc); - fsg->state = FSG_STATE_TERMINATED; /* The thread is dead */ - fsg_function_unbind(c, f); - close_all_backing_files(fsg); - return rc; -} - -static int fsg_function_set_alt(struct usb_function *f, - unsigned intf, unsigned alt) -{ - struct fsg_dev *fsg = func_to_dev(f); - DBG(fsg, "fsg_function_set_alt intf: %d alt: %d\n", intf, alt); - fsg->new_config = 1; - raise_exception(fsg, FSG_STATE_CONFIG_CHANGE); - return 0; -} - -static void fsg_function_disable(struct usb_function *f) -{ - struct fsg_dev *fsg = func_to_dev(f); - DBG(fsg, "fsg_function_disable\n"); - fsg->new_config = 0; - raise_exception(fsg, FSG_STATE_CONFIG_CHANGE); -} - -static int __init fsg_probe(struct platform_device *pdev) -{ - struct usb_mass_storage_platform_data *pdata = pdev->dev.platform_data; - struct fsg_dev *fsg = the_fsg; - - fsg->pdev = pdev; - printk(KERN_INFO "fsg_probe pdata: %p\n", pdata); - - if (pdata) { - if (pdata->vendor) - fsg->vendor = pdata->vendor; - - if (pdata->product) - fsg->product = pdata->product; - - if (pdata->release) - fsg->release = pdata->release; - fsg->nluns = pdata->nluns; - } - - return 0; -} - -static struct platform_driver fsg_platform_driver = { - .driver = { .name = "usb_mass_storage", }, - .probe = fsg_probe, -}; - -int mass_storage_bind_config(struct usb_configuration *c) -{ - int rc; - struct fsg_dev *fsg; - - printk(KERN_INFO "mass_storage_bind_config\n"); - rc = fsg_alloc(); - if (rc) - return rc; - fsg = the_fsg; - - spin_lock_init(&fsg->lock); - init_rwsem(&fsg->filesem); - kref_init(&fsg->ref); - init_completion(&fsg->thread_notifier); - - the_fsg->buf_size = BULK_BUFFER_SIZE; - the_fsg->sdev.name = DRIVER_NAME; - the_fsg->sdev.print_name = print_switch_name; - the_fsg->sdev.print_state = print_switch_state; - rc = switch_dev_register(&the_fsg->sdev); - if (rc < 0) - goto err_switch_dev_register; - - rc = platform_driver_register(&fsg_platform_driver); - if (rc != 0) - goto err_platform_driver_register; - - wake_lock_init(&the_fsg->wake_lock, WAKE_LOCK_SUSPEND, - "usb_mass_storage"); - - fsg->cdev = c->cdev; - fsg->function.name = shortname; - fsg->function.descriptors = fs_function; - fsg->function.bind = fsg_function_bind; - fsg->function.unbind = fsg_function_unbind; - fsg->function.setup = fsg_function_setup; - fsg->function.set_alt = fsg_function_set_alt; - fsg->function.disable = fsg_function_disable; - - rc = usb_add_function(c, &fsg->function); - if (rc != 0) - goto err_usb_add_function; - - - return 0; - -err_usb_add_function: - wake_lock_destroy(&the_fsg->wake_lock); - platform_driver_unregister(&fsg_platform_driver); -err_platform_driver_register: - switch_dev_unregister(&the_fsg->sdev); -err_switch_dev_register: - kref_put(&the_fsg->ref, fsg_release); - - return rc; -} - -static struct android_usb_function mass_storage_function = { - .name = "usb_mass_storage", - .bind_config = mass_storage_bind_config, -}; - -static int __init init(void) -{ - printk(KERN_INFO "f_mass_storage init\n"); - android_register_function(&mass_storage_function); - return 0; -} -module_init(init); - -- 2.7.4