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![Arnd Bergmann](/assets/img/avatar_default.png)
All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1608 lines
40 KiB
C
1608 lines
40 KiB
C
/*
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* printer.c -- Printer gadget driver
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*
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* Copyright (C) 2003-2005 David Brownell
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* Copyright (C) 2006 Craig W. Nadler
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/utsname.h>
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#include <linux/device.h>
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#include <linux/moduleparam.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/types.h>
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#include <linux/ctype.h>
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#include <linux/cdev.h>
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#include <asm/byteorder.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <asm/system.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/g_printer.h>
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#include "gadget_chips.h"
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "usbstring.c"
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#include "config.c"
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#include "epautoconf.c"
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/*-------------------------------------------------------------------------*/
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#define DRIVER_DESC "Printer Gadget"
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#define DRIVER_VERSION "2007 OCT 06"
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static DEFINE_MUTEX(printer_mutex);
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static const char shortname [] = "printer";
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static const char driver_desc [] = DRIVER_DESC;
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static dev_t g_printer_devno;
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static struct class *usb_gadget_class;
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/*-------------------------------------------------------------------------*/
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struct printer_dev {
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spinlock_t lock; /* lock this structure */
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/* lock buffer lists during read/write calls */
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struct mutex lock_printer_io;
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struct usb_gadget *gadget;
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struct usb_request *req; /* for control responses */
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u8 config;
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s8 interface;
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struct usb_ep *in_ep, *out_ep;
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const struct usb_endpoint_descriptor
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*in, *out;
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struct list_head rx_reqs; /* List of free RX structs */
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struct list_head rx_reqs_active; /* List of Active RX xfers */
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struct list_head rx_buffers; /* List of completed xfers */
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/* wait until there is data to be read. */
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wait_queue_head_t rx_wait;
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struct list_head tx_reqs; /* List of free TX structs */
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struct list_head tx_reqs_active; /* List of Active TX xfers */
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/* Wait until there are write buffers available to use. */
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wait_queue_head_t tx_wait;
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/* Wait until all write buffers have been sent. */
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wait_queue_head_t tx_flush_wait;
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struct usb_request *current_rx_req;
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size_t current_rx_bytes;
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u8 *current_rx_buf;
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u8 printer_status;
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u8 reset_printer;
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struct cdev printer_cdev;
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struct device *pdev;
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u8 printer_cdev_open;
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wait_queue_head_t wait;
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};
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static struct printer_dev usb_printer_gadget;
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/*-------------------------------------------------------------------------*/
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/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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/* Thanks to NetChip Technologies for donating this product ID.
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*/
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#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
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#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
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/* Some systems will want different product identifers published in the
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* device descriptor, either numbers or strings or both. These string
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* parameters are in UTF-8 (superset of ASCII's 7 bit characters).
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*/
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static ushort __initdata idVendor;
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module_param(idVendor, ushort, S_IRUGO);
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MODULE_PARM_DESC(idVendor, "USB Vendor ID");
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static ushort __initdata idProduct;
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module_param(idProduct, ushort, S_IRUGO);
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MODULE_PARM_DESC(idProduct, "USB Product ID");
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static ushort __initdata bcdDevice;
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module_param(bcdDevice, ushort, S_IRUGO);
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MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
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static char *__initdata iManufacturer;
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module_param(iManufacturer, charp, S_IRUGO);
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MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
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static char *__initdata iProduct;
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module_param(iProduct, charp, S_IRUGO);
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MODULE_PARM_DESC(iProduct, "USB Product string");
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static char *__initdata iSerialNum;
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module_param(iSerialNum, charp, S_IRUGO);
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MODULE_PARM_DESC(iSerialNum, "1");
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static char *__initdata iPNPstring;
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module_param(iPNPstring, charp, S_IRUGO);
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MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
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/* Number of requests to allocate per endpoint, not used for ep0. */
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static unsigned qlen = 10;
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module_param(qlen, uint, S_IRUGO|S_IWUSR);
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#define QLEN qlen
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#ifdef CONFIG_USB_GADGET_DUALSPEED
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#define DEVSPEED USB_SPEED_HIGH
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#else /* full speed (low speed doesn't do bulk) */
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#define DEVSPEED USB_SPEED_FULL
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#endif
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/*-------------------------------------------------------------------------*/
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#define xprintk(d, level, fmt, args...) \
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printk(level "%s: " fmt, DRIVER_DESC, ## args)
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#ifdef DEBUG
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#define DBG(dev, fmt, args...) \
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xprintk(dev, KERN_DEBUG, fmt, ## args)
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#else
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#define DBG(dev, fmt, args...) \
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do { } while (0)
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#endif /* DEBUG */
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#ifdef VERBOSE
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#define VDBG(dev, fmt, args...) \
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xprintk(dev, KERN_DEBUG, fmt, ## args)
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#else
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#define VDBG(dev, fmt, args...) \
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do { } while (0)
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#endif /* VERBOSE */
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#define ERROR(dev, fmt, args...) \
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xprintk(dev, KERN_ERR, fmt, ## args)
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#define WARNING(dev, fmt, args...) \
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xprintk(dev, KERN_WARNING, fmt, ## args)
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#define INFO(dev, fmt, args...) \
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xprintk(dev, KERN_INFO, fmt, ## args)
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/*-------------------------------------------------------------------------*/
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/* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
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* ep0 implementation: descriptors, config management, setup().
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* also optional class-specific notification interrupt transfer.
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*/
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/*
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* DESCRIPTORS ... most are static, but strings and (full) configuration
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* descriptors are built on demand.
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*/
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#define STRING_MANUFACTURER 1
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#define STRING_PRODUCT 2
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#define STRING_SERIALNUM 3
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/* holds our biggest descriptor */
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#define USB_DESC_BUFSIZE 256
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#define USB_BUFSIZE 8192
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/* This device advertises one configuration. */
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#define DEV_CONFIG_VALUE 1
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#define PRINTER_INTERFACE 0
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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.idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
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.idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
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.iManufacturer = STRING_MANUFACTURER,
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.iProduct = STRING_PRODUCT,
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.iSerialNumber = STRING_SERIALNUM,
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.bNumConfigurations = 1
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};
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static struct usb_otg_descriptor otg_desc = {
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.bLength = sizeof otg_desc,
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.bDescriptorType = USB_DT_OTG,
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.bmAttributes = USB_OTG_SRP
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};
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static struct usb_config_descriptor config_desc = {
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.bLength = sizeof config_desc,
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.bDescriptorType = USB_DT_CONFIG,
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/* compute wTotalLength on the fly */
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.bNumInterfaces = 1,
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.bConfigurationValue = DEV_CONFIG_VALUE,
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.iConfiguration = 0,
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.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
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};
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static struct usb_interface_descriptor intf_desc = {
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.bLength = sizeof intf_desc,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = PRINTER_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_PRINTER,
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.bInterfaceSubClass = 1, /* Printer Sub-Class */
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.bInterfaceProtocol = 2, /* Bi-Directional */
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.iInterface = 0
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};
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static struct usb_endpoint_descriptor fs_ep_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK
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};
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static struct usb_endpoint_descriptor fs_ep_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK
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};
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static const struct usb_descriptor_header *fs_printer_function [11] = {
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(struct usb_descriptor_header *) &otg_desc,
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(struct usb_descriptor_header *) &intf_desc,
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(struct usb_descriptor_header *) &fs_ep_in_desc,
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(struct usb_descriptor_header *) &fs_ep_out_desc,
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NULL
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};
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#ifdef CONFIG_USB_GADGET_DUALSPEED
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/*
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* usb 2.0 devices need to expose both high speed and full speed
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* descriptors, unless they only run at full speed.
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*/
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static struct usb_endpoint_descriptor hs_ep_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512)
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};
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static struct usb_endpoint_descriptor hs_ep_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512)
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};
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static struct usb_qualifier_descriptor dev_qualifier = {
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.bLength = sizeof dev_qualifier,
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.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
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.bcdUSB = cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_PRINTER,
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.bNumConfigurations = 1
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};
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static const struct usb_descriptor_header *hs_printer_function [11] = {
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(struct usb_descriptor_header *) &otg_desc,
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(struct usb_descriptor_header *) &intf_desc,
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(struct usb_descriptor_header *) &hs_ep_in_desc,
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(struct usb_descriptor_header *) &hs_ep_out_desc,
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NULL
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};
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/* maxpacket and other transfer characteristics vary by speed. */
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#define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
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#else
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/* if there's no high speed support, maxpacket doesn't change. */
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#define ep_desc(g, hs, fs) (((void)(g)), (fs))
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#endif /* !CONFIG_USB_GADGET_DUALSPEED */
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/*-------------------------------------------------------------------------*/
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/* descriptors that are built on-demand */
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static char manufacturer [50];
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static char product_desc [40] = DRIVER_DESC;
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static char serial_num [40] = "1";
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static char pnp_string [1024] =
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"XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
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/* static strings, in UTF-8 */
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static struct usb_string strings [] = {
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{ STRING_MANUFACTURER, manufacturer, },
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{ STRING_PRODUCT, product_desc, },
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{ STRING_SERIALNUM, serial_num, },
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab = {
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.language = 0x0409, /* en-us */
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.strings = strings,
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};
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/*-------------------------------------------------------------------------*/
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static struct usb_request *
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printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
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{
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struct usb_request *req;
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req = usb_ep_alloc_request(ep, gfp_flags);
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if (req != NULL) {
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req->length = len;
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req->buf = kmalloc(len, gfp_flags);
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if (req->buf == NULL) {
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usb_ep_free_request(ep, req);
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return NULL;
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}
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}
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return req;
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}
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static void
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printer_req_free(struct usb_ep *ep, struct usb_request *req)
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{
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if (ep != NULL && req != NULL) {
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kfree(req->buf);
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usb_ep_free_request(ep, req);
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}
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}
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/*-------------------------------------------------------------------------*/
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static void rx_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct printer_dev *dev = ep->driver_data;
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int status = req->status;
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unsigned long flags;
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spin_lock_irqsave(&dev->lock, flags);
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list_del_init(&req->list); /* Remode from Active List */
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switch (status) {
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/* normal completion */
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case 0:
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if (req->actual > 0) {
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list_add_tail(&req->list, &dev->rx_buffers);
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DBG(dev, "G_Printer : rx length %d\n", req->actual);
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} else {
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list_add(&req->list, &dev->rx_reqs);
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}
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break;
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|
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/* software-driven interface shutdown */
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case -ECONNRESET: /* unlink */
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case -ESHUTDOWN: /* disconnect etc */
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VDBG(dev, "rx shutdown, code %d\n", status);
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list_add(&req->list, &dev->rx_reqs);
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break;
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|
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/* for hardware automagic (such as pxa) */
|
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case -ECONNABORTED: /* endpoint reset */
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DBG(dev, "rx %s reset\n", ep->name);
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list_add(&req->list, &dev->rx_reqs);
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break;
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|
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/* data overrun */
|
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case -EOVERFLOW:
|
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/* FALLTHROUGH */
|
|
|
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default:
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DBG(dev, "rx status %d\n", status);
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list_add(&req->list, &dev->rx_reqs);
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break;
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}
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|
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wake_up_interruptible(&dev->rx_wait);
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spin_unlock_irqrestore(&dev->lock, flags);
|
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}
|
|
|
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static void tx_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct printer_dev *dev = ep->driver_data;
|
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|
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switch (req->status) {
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default:
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VDBG(dev, "tx err %d\n", req->status);
|
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/* FALLTHROUGH */
|
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case -ECONNRESET: /* unlink */
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case -ESHUTDOWN: /* disconnect etc */
|
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break;
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case 0:
|
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break;
|
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}
|
|
|
|
spin_lock(&dev->lock);
|
|
/* Take the request struct off the active list and put it on the
|
|
* free list.
|
|
*/
|
|
list_del_init(&req->list);
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
wake_up_interruptible(&dev->tx_wait);
|
|
if (likely(list_empty(&dev->tx_reqs_active)))
|
|
wake_up_interruptible(&dev->tx_flush_wait);
|
|
|
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spin_unlock(&dev->lock);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int
|
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printer_open(struct inode *inode, struct file *fd)
|
|
{
|
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struct printer_dev *dev;
|
|
unsigned long flags;
|
|
int ret = -EBUSY;
|
|
|
|
mutex_lock(&printer_mutex);
|
|
dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
if (!dev->printer_cdev_open) {
|
|
dev->printer_cdev_open = 1;
|
|
fd->private_data = dev;
|
|
ret = 0;
|
|
/* Change the printer status to show that it's on-line. */
|
|
dev->printer_status |= PRINTER_SELECTED;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
DBG(dev, "printer_open returned %x\n", ret);
|
|
mutex_unlock(&printer_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
printer_close(struct inode *inode, struct file *fd)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
dev->printer_cdev_open = 0;
|
|
fd->private_data = NULL;
|
|
/* Change printer status to show that the printer is off-line. */
|
|
dev->printer_status &= ~PRINTER_SELECTED;
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
DBG(dev, "printer_close\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This function must be called with interrupts turned off. */
|
|
static void
|
|
setup_rx_reqs(struct printer_dev *dev)
|
|
{
|
|
struct usb_request *req;
|
|
|
|
while (likely(!list_empty(&dev->rx_reqs))) {
|
|
int error;
|
|
|
|
req = container_of(dev->rx_reqs.next,
|
|
struct usb_request, list);
|
|
list_del_init(&req->list);
|
|
|
|
/* The USB Host sends us whatever amount of data it wants to
|
|
* so we always set the length field to the full USB_BUFSIZE.
|
|
* If the amount of data is more than the read() caller asked
|
|
* for it will be stored in the request buffer until it is
|
|
* asked for by read().
|
|
*/
|
|
req->length = USB_BUFSIZE;
|
|
req->complete = rx_complete;
|
|
|
|
error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
|
|
if (error) {
|
|
DBG(dev, "rx submit --> %d\n", error);
|
|
list_add(&req->list, &dev->rx_reqs);
|
|
break;
|
|
} else {
|
|
list_add(&req->list, &dev->rx_reqs_active);
|
|
}
|
|
}
|
|
}
|
|
|
|
static ssize_t
|
|
printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
size_t size;
|
|
size_t bytes_copied;
|
|
struct usb_request *req;
|
|
/* This is a pointer to the current USB rx request. */
|
|
struct usb_request *current_rx_req;
|
|
/* This is the number of bytes in the current rx buffer. */
|
|
size_t current_rx_bytes;
|
|
/* This is a pointer to the current rx buffer. */
|
|
u8 *current_rx_buf;
|
|
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
|
|
DBG(dev, "printer_read trying to read %d bytes\n", (int)len);
|
|
|
|
mutex_lock(&dev->lock_printer_io);
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
/* We will use this flag later to check if a printer reset happened
|
|
* after we turn interrupts back on.
|
|
*/
|
|
dev->reset_printer = 0;
|
|
|
|
setup_rx_reqs(dev);
|
|
|
|
bytes_copied = 0;
|
|
current_rx_req = dev->current_rx_req;
|
|
current_rx_bytes = dev->current_rx_bytes;
|
|
current_rx_buf = dev->current_rx_buf;
|
|
dev->current_rx_req = NULL;
|
|
dev->current_rx_bytes = 0;
|
|
dev->current_rx_buf = NULL;
|
|
|
|
/* Check if there is any data in the read buffers. Please note that
|
|
* current_rx_bytes is the number of bytes in the current rx buffer.
|
|
* If it is zero then check if there are any other rx_buffers that
|
|
* are on the completed list. We are only out of data if all rx
|
|
* buffers are empty.
|
|
*/
|
|
if ((current_rx_bytes == 0) &&
|
|
(likely(list_empty(&dev->rx_buffers)))) {
|
|
/* Turn interrupts back on before sleeping. */
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
/*
|
|
* If no data is available check if this is a NON-Blocking
|
|
* call or not.
|
|
*/
|
|
if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Sleep until data is available */
|
|
wait_event_interruptible(dev->rx_wait,
|
|
(likely(!list_empty(&dev->rx_buffers))));
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
}
|
|
|
|
/* We have data to return then copy it to the caller's buffer.*/
|
|
while ((current_rx_bytes || likely(!list_empty(&dev->rx_buffers)))
|
|
&& len) {
|
|
if (current_rx_bytes == 0) {
|
|
req = container_of(dev->rx_buffers.next,
|
|
struct usb_request, list);
|
|
list_del_init(&req->list);
|
|
|
|
if (req->actual && req->buf) {
|
|
current_rx_req = req;
|
|
current_rx_bytes = req->actual;
|
|
current_rx_buf = req->buf;
|
|
} else {
|
|
list_add(&req->list, &dev->rx_reqs);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Don't leave irqs off while doing memory copies */
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
if (len > current_rx_bytes)
|
|
size = current_rx_bytes;
|
|
else
|
|
size = len;
|
|
|
|
size -= copy_to_user(buf, current_rx_buf, size);
|
|
bytes_copied += size;
|
|
len -= size;
|
|
buf += size;
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
/* We've disconnected or reset so return. */
|
|
if (dev->reset_printer) {
|
|
list_add(¤t_rx_req->list, &dev->rx_reqs);
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* If we not returning all the data left in this RX request
|
|
* buffer then adjust the amount of data left in the buffer.
|
|
* Othewise if we are done with this RX request buffer then
|
|
* requeue it to get any incoming data from the USB host.
|
|
*/
|
|
if (size < current_rx_bytes) {
|
|
current_rx_bytes -= size;
|
|
current_rx_buf += size;
|
|
} else {
|
|
list_add(¤t_rx_req->list, &dev->rx_reqs);
|
|
current_rx_bytes = 0;
|
|
current_rx_buf = NULL;
|
|
current_rx_req = NULL;
|
|
}
|
|
}
|
|
|
|
dev->current_rx_req = current_rx_req;
|
|
dev->current_rx_bytes = current_rx_bytes;
|
|
dev->current_rx_buf = current_rx_buf;
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
|
|
DBG(dev, "printer_read returned %d bytes\n", (int)bytes_copied);
|
|
|
|
if (bytes_copied)
|
|
return bytes_copied;
|
|
else
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static ssize_t
|
|
printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
size_t size; /* Amount of data in a TX request. */
|
|
size_t bytes_copied = 0;
|
|
struct usb_request *req;
|
|
|
|
DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
|
|
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&dev->lock_printer_io);
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
/* Check if a printer reset happens while we have interrupts on */
|
|
dev->reset_printer = 0;
|
|
|
|
/* Check if there is any available write buffers */
|
|
if (likely(list_empty(&dev->tx_reqs))) {
|
|
/* Turn interrupts back on before sleeping. */
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
/*
|
|
* If write buffers are available check if this is
|
|
* a NON-Blocking call or not.
|
|
*/
|
|
if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) {
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Sleep until a write buffer is available */
|
|
wait_event_interruptible(dev->tx_wait,
|
|
(likely(!list_empty(&dev->tx_reqs))));
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
}
|
|
|
|
while (likely(!list_empty(&dev->tx_reqs)) && len) {
|
|
|
|
if (len > USB_BUFSIZE)
|
|
size = USB_BUFSIZE;
|
|
else
|
|
size = len;
|
|
|
|
req = container_of(dev->tx_reqs.next, struct usb_request,
|
|
list);
|
|
list_del_init(&req->list);
|
|
|
|
req->complete = tx_complete;
|
|
req->length = size;
|
|
|
|
/* Check if we need to send a zero length packet. */
|
|
if (len > size)
|
|
/* They will be more TX requests so no yet. */
|
|
req->zero = 0;
|
|
else
|
|
/* If the data amount is not a multple of the
|
|
* maxpacket size then send a zero length packet.
|
|
*/
|
|
req->zero = ((len % dev->in_ep->maxpacket) == 0);
|
|
|
|
/* Don't leave irqs off while doing memory copies */
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
if (copy_from_user(req->buf, buf, size)) {
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return bytes_copied;
|
|
}
|
|
|
|
bytes_copied += size;
|
|
len -= size;
|
|
buf += size;
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
/* We've disconnected or reset so free the req and buffer */
|
|
if (dev->reset_printer) {
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
list_add(&req->list, &dev->tx_reqs_active);
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
|
|
DBG(dev, "printer_write sent %d bytes\n", (int)bytes_copied);
|
|
|
|
if (bytes_copied) {
|
|
return bytes_copied;
|
|
} else {
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
static int
|
|
printer_fsync(struct file *fd, int datasync)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
int tx_list_empty;
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
if (!tx_list_empty) {
|
|
/* Sleep until all data has been sent */
|
|
wait_event_interruptible(dev->tx_flush_wait,
|
|
(likely(list_empty(&dev->tx_reqs_active))));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int
|
|
printer_poll(struct file *fd, poll_table *wait)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
int status = 0;
|
|
|
|
mutex_lock(&dev->lock_printer_io);
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
setup_rx_reqs(dev);
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
mutex_unlock(&dev->lock_printer_io);
|
|
|
|
poll_wait(fd, &dev->rx_wait, wait);
|
|
poll_wait(fd, &dev->tx_wait, wait);
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
if (likely(!list_empty(&dev->tx_reqs)))
|
|
status |= POLLOUT | POLLWRNORM;
|
|
|
|
if (likely(dev->current_rx_bytes) ||
|
|
likely(!list_empty(&dev->rx_buffers)))
|
|
status |= POLLIN | POLLRDNORM;
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
return status;
|
|
}
|
|
|
|
static long
|
|
printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
|
|
{
|
|
struct printer_dev *dev = fd->private_data;
|
|
unsigned long flags;
|
|
int status = 0;
|
|
|
|
DBG(dev, "printer_ioctl: cmd=0x%4.4x, arg=%lu\n", code, arg);
|
|
|
|
/* handle ioctls */
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
switch (code) {
|
|
case GADGET_GET_PRINTER_STATUS:
|
|
status = (int)dev->printer_status;
|
|
break;
|
|
case GADGET_SET_PRINTER_STATUS:
|
|
dev->printer_status = (u8)arg;
|
|
break;
|
|
default:
|
|
/* could not handle ioctl */
|
|
DBG(dev, "printer_ioctl: ERROR cmd=0x%4.4xis not supported\n",
|
|
code);
|
|
status = -ENOTTY;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
|
|
return status;
|
|
}
|
|
|
|
/* used after endpoint configuration */
|
|
static const struct file_operations printer_io_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = printer_open,
|
|
.read = printer_read,
|
|
.write = printer_write,
|
|
.fsync = printer_fsync,
|
|
.poll = printer_poll,
|
|
.unlocked_ioctl = printer_ioctl,
|
|
.release = printer_close
|
|
};
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int
|
|
set_printer_interface(struct printer_dev *dev)
|
|
{
|
|
int result = 0;
|
|
|
|
dev->in = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
|
|
dev->in_ep->driver_data = dev;
|
|
|
|
dev->out = ep_desc(dev->gadget, &hs_ep_out_desc, &fs_ep_out_desc);
|
|
dev->out_ep->driver_data = dev;
|
|
|
|
result = usb_ep_enable(dev->in_ep, dev->in);
|
|
if (result != 0) {
|
|
DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
|
|
goto done;
|
|
}
|
|
|
|
result = usb_ep_enable(dev->out_ep, dev->out);
|
|
if (result != 0) {
|
|
DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
/* on error, disable any endpoints */
|
|
if (result != 0) {
|
|
(void) usb_ep_disable(dev->in_ep);
|
|
(void) usb_ep_disable(dev->out_ep);
|
|
dev->in = NULL;
|
|
dev->out = NULL;
|
|
}
|
|
|
|
/* caller is responsible for cleanup on error */
|
|
return result;
|
|
}
|
|
|
|
static void printer_reset_interface(struct printer_dev *dev)
|
|
{
|
|
if (dev->interface < 0)
|
|
return;
|
|
|
|
DBG(dev, "%s\n", __func__);
|
|
|
|
if (dev->in)
|
|
usb_ep_disable(dev->in_ep);
|
|
|
|
if (dev->out)
|
|
usb_ep_disable(dev->out_ep);
|
|
|
|
dev->interface = -1;
|
|
}
|
|
|
|
/* change our operational config. must agree with the code
|
|
* that returns config descriptors, and altsetting code.
|
|
*/
|
|
static int
|
|
printer_set_config(struct printer_dev *dev, unsigned number)
|
|
{
|
|
int result = 0;
|
|
struct usb_gadget *gadget = dev->gadget;
|
|
|
|
switch (number) {
|
|
case DEV_CONFIG_VALUE:
|
|
result = 0;
|
|
break;
|
|
default:
|
|
result = -EINVAL;
|
|
/* FALL THROUGH */
|
|
case 0:
|
|
break;
|
|
}
|
|
|
|
if (result) {
|
|
usb_gadget_vbus_draw(dev->gadget,
|
|
dev->gadget->is_otg ? 8 : 100);
|
|
} else {
|
|
char *speed;
|
|
unsigned power;
|
|
|
|
power = 2 * config_desc.bMaxPower;
|
|
usb_gadget_vbus_draw(dev->gadget, power);
|
|
|
|
switch (gadget->speed) {
|
|
case USB_SPEED_FULL: speed = "full"; break;
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
case USB_SPEED_HIGH: speed = "high"; break;
|
|
#endif
|
|
default: speed = "?"; break;
|
|
}
|
|
|
|
dev->config = number;
|
|
INFO(dev, "%s speed config #%d: %d mA, %s\n",
|
|
speed, number, power, driver_desc);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
config_buf(enum usb_device_speed speed, u8 *buf, u8 type, unsigned index,
|
|
int is_otg)
|
|
{
|
|
int len;
|
|
const struct usb_descriptor_header **function;
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
int hs = (speed == USB_SPEED_HIGH);
|
|
|
|
if (type == USB_DT_OTHER_SPEED_CONFIG)
|
|
hs = !hs;
|
|
|
|
if (hs) {
|
|
function = hs_printer_function;
|
|
} else {
|
|
function = fs_printer_function;
|
|
}
|
|
#else
|
|
function = fs_printer_function;
|
|
#endif
|
|
|
|
if (index >= device_desc.bNumConfigurations)
|
|
return -EINVAL;
|
|
|
|
/* for now, don't advertise srp-only devices */
|
|
if (!is_otg)
|
|
function++;
|
|
|
|
len = usb_gadget_config_buf(&config_desc, buf, USB_DESC_BUFSIZE,
|
|
function);
|
|
if (len < 0)
|
|
return len;
|
|
((struct usb_config_descriptor *) buf)->bDescriptorType = type;
|
|
return len;
|
|
}
|
|
|
|
/* Change our operational Interface. */
|
|
static int
|
|
set_interface(struct printer_dev *dev, unsigned number)
|
|
{
|
|
int result = 0;
|
|
|
|
/* Free the current interface */
|
|
switch (dev->interface) {
|
|
case PRINTER_INTERFACE:
|
|
printer_reset_interface(dev);
|
|
break;
|
|
}
|
|
|
|
switch (number) {
|
|
case PRINTER_INTERFACE:
|
|
result = set_printer_interface(dev);
|
|
if (result) {
|
|
printer_reset_interface(dev);
|
|
} else {
|
|
dev->interface = PRINTER_INTERFACE;
|
|
}
|
|
break;
|
|
default:
|
|
result = -EINVAL;
|
|
/* FALL THROUGH */
|
|
}
|
|
|
|
if (!result)
|
|
INFO(dev, "Using interface %x\n", number);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void printer_setup_complete(struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
if (req->status || req->actual != req->length)
|
|
DBG((struct printer_dev *) ep->driver_data,
|
|
"setup complete --> %d, %d/%d\n",
|
|
req->status, req->actual, req->length);
|
|
}
|
|
|
|
static void printer_soft_reset(struct printer_dev *dev)
|
|
{
|
|
struct usb_request *req;
|
|
|
|
INFO(dev, "Received Printer Reset Request\n");
|
|
|
|
if (usb_ep_disable(dev->in_ep))
|
|
DBG(dev, "Failed to disable USB in_ep\n");
|
|
if (usb_ep_disable(dev->out_ep))
|
|
DBG(dev, "Failed to disable USB out_ep\n");
|
|
|
|
if (dev->current_rx_req != NULL) {
|
|
list_add(&dev->current_rx_req->list, &dev->rx_reqs);
|
|
dev->current_rx_req = NULL;
|
|
}
|
|
dev->current_rx_bytes = 0;
|
|
dev->current_rx_buf = NULL;
|
|
dev->reset_printer = 1;
|
|
|
|
while (likely(!(list_empty(&dev->rx_buffers)))) {
|
|
req = container_of(dev->rx_buffers.next, struct usb_request,
|
|
list);
|
|
list_del_init(&req->list);
|
|
list_add(&req->list, &dev->rx_reqs);
|
|
}
|
|
|
|
while (likely(!(list_empty(&dev->rx_reqs_active)))) {
|
|
req = container_of(dev->rx_buffers.next, struct usb_request,
|
|
list);
|
|
list_del_init(&req->list);
|
|
list_add(&req->list, &dev->rx_reqs);
|
|
}
|
|
|
|
while (likely(!(list_empty(&dev->tx_reqs_active)))) {
|
|
req = container_of(dev->tx_reqs_active.next,
|
|
struct usb_request, list);
|
|
list_del_init(&req->list);
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
}
|
|
|
|
if (usb_ep_enable(dev->in_ep, dev->in))
|
|
DBG(dev, "Failed to enable USB in_ep\n");
|
|
if (usb_ep_enable(dev->out_ep, dev->out))
|
|
DBG(dev, "Failed to enable USB out_ep\n");
|
|
|
|
wake_up_interruptible(&dev->rx_wait);
|
|
wake_up_interruptible(&dev->tx_wait);
|
|
wake_up_interruptible(&dev->tx_flush_wait);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* The setup() callback implements all the ep0 functionality that's not
|
|
* handled lower down.
|
|
*/
|
|
static int
|
|
printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
|
|
{
|
|
struct printer_dev *dev = get_gadget_data(gadget);
|
|
struct usb_request *req = dev->req;
|
|
int value = -EOPNOTSUPP;
|
|
u16 wIndex = le16_to_cpu(ctrl->wIndex);
|
|
u16 wValue = le16_to_cpu(ctrl->wValue);
|
|
u16 wLength = le16_to_cpu(ctrl->wLength);
|
|
|
|
DBG(dev, "ctrl req%02x.%02x v%04x i%04x l%d\n",
|
|
ctrl->bRequestType, ctrl->bRequest, wValue, wIndex, wLength);
|
|
|
|
req->complete = printer_setup_complete;
|
|
|
|
switch (ctrl->bRequestType&USB_TYPE_MASK) {
|
|
|
|
case USB_TYPE_STANDARD:
|
|
switch (ctrl->bRequest) {
|
|
|
|
case USB_REQ_GET_DESCRIPTOR:
|
|
if (ctrl->bRequestType != USB_DIR_IN)
|
|
break;
|
|
switch (wValue >> 8) {
|
|
|
|
case USB_DT_DEVICE:
|
|
value = min(wLength, (u16) sizeof device_desc);
|
|
memcpy(req->buf, &device_desc, value);
|
|
break;
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
case USB_DT_DEVICE_QUALIFIER:
|
|
if (!gadget->is_dualspeed)
|
|
break;
|
|
value = min(wLength,
|
|
(u16) sizeof dev_qualifier);
|
|
memcpy(req->buf, &dev_qualifier, value);
|
|
break;
|
|
|
|
case USB_DT_OTHER_SPEED_CONFIG:
|
|
if (!gadget->is_dualspeed)
|
|
break;
|
|
/* FALLTHROUGH */
|
|
#endif /* CONFIG_USB_GADGET_DUALSPEED */
|
|
case USB_DT_CONFIG:
|
|
value = config_buf(gadget->speed, req->buf,
|
|
wValue >> 8,
|
|
wValue & 0xff,
|
|
gadget->is_otg);
|
|
if (value >= 0)
|
|
value = min(wLength, (u16) value);
|
|
break;
|
|
|
|
case USB_DT_STRING:
|
|
value = usb_gadget_get_string(&stringtab,
|
|
wValue & 0xff, req->buf);
|
|
if (value >= 0)
|
|
value = min(wLength, (u16) value);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case USB_REQ_SET_CONFIGURATION:
|
|
if (ctrl->bRequestType != 0)
|
|
break;
|
|
if (gadget->a_hnp_support)
|
|
DBG(dev, "HNP available\n");
|
|
else if (gadget->a_alt_hnp_support)
|
|
DBG(dev, "HNP needs a different root port\n");
|
|
value = printer_set_config(dev, wValue);
|
|
break;
|
|
case USB_REQ_GET_CONFIGURATION:
|
|
if (ctrl->bRequestType != USB_DIR_IN)
|
|
break;
|
|
*(u8 *)req->buf = dev->config;
|
|
value = min(wLength, (u16) 1);
|
|
break;
|
|
|
|
case USB_REQ_SET_INTERFACE:
|
|
if (ctrl->bRequestType != USB_RECIP_INTERFACE ||
|
|
!dev->config)
|
|
break;
|
|
|
|
value = set_interface(dev, PRINTER_INTERFACE);
|
|
break;
|
|
case USB_REQ_GET_INTERFACE:
|
|
if (ctrl->bRequestType !=
|
|
(USB_DIR_IN|USB_RECIP_INTERFACE)
|
|
|| !dev->config)
|
|
break;
|
|
|
|
*(u8 *)req->buf = dev->interface;
|
|
value = min(wLength, (u16) 1);
|
|
break;
|
|
|
|
default:
|
|
goto unknown;
|
|
}
|
|
break;
|
|
|
|
case USB_TYPE_CLASS:
|
|
switch (ctrl->bRequest) {
|
|
case 0: /* Get the IEEE-1284 PNP String */
|
|
/* Only one printer interface is supported. */
|
|
if ((wIndex>>8) != PRINTER_INTERFACE)
|
|
break;
|
|
|
|
value = (pnp_string[0]<<8)|pnp_string[1];
|
|
memcpy(req->buf, pnp_string, value);
|
|
DBG(dev, "1284 PNP String: %x %s\n", value,
|
|
&pnp_string[2]);
|
|
break;
|
|
|
|
case 1: /* Get Port Status */
|
|
/* Only one printer interface is supported. */
|
|
if (wIndex != PRINTER_INTERFACE)
|
|
break;
|
|
|
|
*(u8 *)req->buf = dev->printer_status;
|
|
value = min(wLength, (u16) 1);
|
|
break;
|
|
|
|
case 2: /* Soft Reset */
|
|
/* Only one printer interface is supported. */
|
|
if (wIndex != PRINTER_INTERFACE)
|
|
break;
|
|
|
|
printer_soft_reset(dev);
|
|
|
|
value = 0;
|
|
break;
|
|
|
|
default:
|
|
goto unknown;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
unknown:
|
|
VDBG(dev,
|
|
"unknown ctrl req%02x.%02x v%04x i%04x l%d\n",
|
|
ctrl->bRequestType, ctrl->bRequest,
|
|
wValue, wIndex, wLength);
|
|
break;
|
|
}
|
|
|
|
/* respond with data transfer before status phase? */
|
|
if (value >= 0) {
|
|
req->length = value;
|
|
req->zero = value < wLength;
|
|
value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
|
|
if (value < 0) {
|
|
DBG(dev, "ep_queue --> %d\n", value);
|
|
req->status = 0;
|
|
printer_setup_complete(gadget->ep0, req);
|
|
}
|
|
}
|
|
|
|
/* host either stalls (value < 0) or reports success */
|
|
return value;
|
|
}
|
|
|
|
static void
|
|
printer_disconnect(struct usb_gadget *gadget)
|
|
{
|
|
struct printer_dev *dev = get_gadget_data(gadget);
|
|
unsigned long flags;
|
|
|
|
DBG(dev, "%s\n", __func__);
|
|
|
|
spin_lock_irqsave(&dev->lock, flags);
|
|
|
|
printer_reset_interface(dev);
|
|
|
|
spin_unlock_irqrestore(&dev->lock, flags);
|
|
}
|
|
|
|
static void
|
|
printer_unbind(struct usb_gadget *gadget)
|
|
{
|
|
struct printer_dev *dev = get_gadget_data(gadget);
|
|
struct usb_request *req;
|
|
|
|
|
|
DBG(dev, "%s\n", __func__);
|
|
|
|
/* Remove sysfs files */
|
|
device_destroy(usb_gadget_class, g_printer_devno);
|
|
|
|
/* Remove Character Device */
|
|
cdev_del(&dev->printer_cdev);
|
|
|
|
/* we must already have been disconnected ... no i/o may be active */
|
|
WARN_ON(!list_empty(&dev->tx_reqs_active));
|
|
WARN_ON(!list_empty(&dev->rx_reqs_active));
|
|
|
|
/* Free all memory for this driver. */
|
|
while (!list_empty(&dev->tx_reqs)) {
|
|
req = container_of(dev->tx_reqs.next, struct usb_request,
|
|
list);
|
|
list_del(&req->list);
|
|
printer_req_free(dev->in_ep, req);
|
|
}
|
|
|
|
if (dev->current_rx_req != NULL)
|
|
printer_req_free(dev->out_ep, dev->current_rx_req);
|
|
|
|
while (!list_empty(&dev->rx_reqs)) {
|
|
req = container_of(dev->rx_reqs.next,
|
|
struct usb_request, list);
|
|
list_del(&req->list);
|
|
printer_req_free(dev->out_ep, req);
|
|
}
|
|
|
|
while (!list_empty(&dev->rx_buffers)) {
|
|
req = container_of(dev->rx_buffers.next,
|
|
struct usb_request, list);
|
|
list_del(&req->list);
|
|
printer_req_free(dev->out_ep, req);
|
|
}
|
|
|
|
if (dev->req) {
|
|
printer_req_free(gadget->ep0, dev->req);
|
|
dev->req = NULL;
|
|
}
|
|
|
|
set_gadget_data(gadget, NULL);
|
|
}
|
|
|
|
static int __ref
|
|
printer_bind(struct usb_gadget *gadget)
|
|
{
|
|
struct printer_dev *dev;
|
|
struct usb_ep *in_ep, *out_ep;
|
|
int status = -ENOMEM;
|
|
int gcnum;
|
|
size_t len;
|
|
u32 i;
|
|
struct usb_request *req;
|
|
|
|
dev = &usb_printer_gadget;
|
|
|
|
|
|
/* Setup the sysfs files for the printer gadget. */
|
|
dev->pdev = device_create(usb_gadget_class, NULL, g_printer_devno,
|
|
NULL, "g_printer");
|
|
if (IS_ERR(dev->pdev)) {
|
|
ERROR(dev, "Failed to create device: g_printer\n");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Register a character device as an interface to a user mode
|
|
* program that handles the printer specific functionality.
|
|
*/
|
|
cdev_init(&dev->printer_cdev, &printer_io_operations);
|
|
dev->printer_cdev.owner = THIS_MODULE;
|
|
status = cdev_add(&dev->printer_cdev, g_printer_devno, 1);
|
|
if (status) {
|
|
ERROR(dev, "Failed to open char device\n");
|
|
goto fail;
|
|
}
|
|
|
|
gcnum = usb_gadget_controller_number(gadget);
|
|
if (gcnum >= 0) {
|
|
device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
|
|
} else {
|
|
dev_warn(&gadget->dev, "controller '%s' not recognized\n",
|
|
gadget->name);
|
|
/* unrecognized, but safe unless bulk is REALLY quirky */
|
|
device_desc.bcdDevice =
|
|
cpu_to_le16(0xFFFF);
|
|
}
|
|
snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
|
|
init_utsname()->sysname, init_utsname()->release,
|
|
gadget->name);
|
|
|
|
device_desc.idVendor =
|
|
cpu_to_le16(PRINTER_VENDOR_NUM);
|
|
device_desc.idProduct =
|
|
cpu_to_le16(PRINTER_PRODUCT_NUM);
|
|
|
|
/* support optional vendor/distro customization */
|
|
if (idVendor) {
|
|
if (!idProduct) {
|
|
dev_err(&gadget->dev, "idVendor needs idProduct!\n");
|
|
return -ENODEV;
|
|
}
|
|
device_desc.idVendor = cpu_to_le16(idVendor);
|
|
device_desc.idProduct = cpu_to_le16(idProduct);
|
|
if (bcdDevice)
|
|
device_desc.bcdDevice = cpu_to_le16(bcdDevice);
|
|
}
|
|
|
|
if (iManufacturer)
|
|
strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
|
|
|
|
if (iProduct)
|
|
strlcpy(product_desc, iProduct, sizeof product_desc);
|
|
|
|
if (iSerialNum)
|
|
strlcpy(serial_num, iSerialNum, sizeof serial_num);
|
|
|
|
if (iPNPstring)
|
|
strlcpy(&pnp_string[2], iPNPstring, (sizeof pnp_string)-2);
|
|
|
|
len = strlen(pnp_string);
|
|
pnp_string[0] = (len >> 8) & 0xFF;
|
|
pnp_string[1] = len & 0xFF;
|
|
|
|
/* all we really need is bulk IN/OUT */
|
|
usb_ep_autoconfig_reset(gadget);
|
|
in_ep = usb_ep_autoconfig(gadget, &fs_ep_in_desc);
|
|
if (!in_ep) {
|
|
autoconf_fail:
|
|
dev_err(&gadget->dev, "can't autoconfigure on %s\n",
|
|
gadget->name);
|
|
return -ENODEV;
|
|
}
|
|
in_ep->driver_data = in_ep; /* claim */
|
|
|
|
out_ep = usb_ep_autoconfig(gadget, &fs_ep_out_desc);
|
|
if (!out_ep)
|
|
goto autoconf_fail;
|
|
out_ep->driver_data = out_ep; /* claim */
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
/* assumes ep0 uses the same value for both speeds ... */
|
|
dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
|
|
|
|
/* and that all endpoints are dual-speed */
|
|
hs_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress;
|
|
hs_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress;
|
|
#endif /* DUALSPEED */
|
|
|
|
device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
|
|
usb_gadget_set_selfpowered(gadget);
|
|
|
|
if (gadget->is_otg) {
|
|
otg_desc.bmAttributes |= USB_OTG_HNP,
|
|
config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
}
|
|
|
|
spin_lock_init(&dev->lock);
|
|
mutex_init(&dev->lock_printer_io);
|
|
INIT_LIST_HEAD(&dev->tx_reqs);
|
|
INIT_LIST_HEAD(&dev->tx_reqs_active);
|
|
INIT_LIST_HEAD(&dev->rx_reqs);
|
|
INIT_LIST_HEAD(&dev->rx_reqs_active);
|
|
INIT_LIST_HEAD(&dev->rx_buffers);
|
|
init_waitqueue_head(&dev->rx_wait);
|
|
init_waitqueue_head(&dev->tx_wait);
|
|
init_waitqueue_head(&dev->tx_flush_wait);
|
|
|
|
dev->config = 0;
|
|
dev->interface = -1;
|
|
dev->printer_cdev_open = 0;
|
|
dev->printer_status = PRINTER_NOT_ERROR;
|
|
dev->current_rx_req = NULL;
|
|
dev->current_rx_bytes = 0;
|
|
dev->current_rx_buf = NULL;
|
|
|
|
dev->in_ep = in_ep;
|
|
dev->out_ep = out_ep;
|
|
|
|
/* preallocate control message data and buffer */
|
|
dev->req = printer_req_alloc(gadget->ep0, USB_DESC_BUFSIZE,
|
|
GFP_KERNEL);
|
|
if (!dev->req) {
|
|
status = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < QLEN; i++) {
|
|
req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
|
|
if (!req) {
|
|
while (!list_empty(&dev->tx_reqs)) {
|
|
req = container_of(dev->tx_reqs.next,
|
|
struct usb_request, list);
|
|
list_del(&req->list);
|
|
printer_req_free(dev->in_ep, req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
list_add(&req->list, &dev->tx_reqs);
|
|
}
|
|
|
|
for (i = 0; i < QLEN; i++) {
|
|
req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
|
|
if (!req) {
|
|
while (!list_empty(&dev->rx_reqs)) {
|
|
req = container_of(dev->rx_reqs.next,
|
|
struct usb_request, list);
|
|
list_del(&req->list);
|
|
printer_req_free(dev->out_ep, req);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
list_add(&req->list, &dev->rx_reqs);
|
|
}
|
|
|
|
dev->req->complete = printer_setup_complete;
|
|
|
|
/* finish hookup to lower layer ... */
|
|
dev->gadget = gadget;
|
|
set_gadget_data(gadget, dev);
|
|
gadget->ep0->driver_data = dev;
|
|
|
|
INFO(dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
|
|
INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, out_ep->name,
|
|
in_ep->name);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
printer_unbind(gadget);
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static struct usb_gadget_driver printer_driver = {
|
|
.speed = DEVSPEED,
|
|
|
|
.function = (char *) driver_desc,
|
|
.bind = printer_bind,
|
|
.unbind = printer_unbind,
|
|
|
|
.setup = printer_setup,
|
|
.disconnect = printer_disconnect,
|
|
|
|
.driver = {
|
|
.name = (char *) shortname,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_AUTHOR("Craig Nadler");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init
|
|
init(void)
|
|
{
|
|
int status;
|
|
|
|
usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget");
|
|
if (IS_ERR(usb_gadget_class)) {
|
|
status = PTR_ERR(usb_gadget_class);
|
|
ERROR(dev, "unable to create usb_gadget class %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
status = alloc_chrdev_region(&g_printer_devno, 0, 1,
|
|
"USB printer gadget");
|
|
if (status) {
|
|
ERROR(dev, "alloc_chrdev_region %d\n", status);
|
|
class_destroy(usb_gadget_class);
|
|
return status;
|
|
}
|
|
|
|
status = usb_gadget_register_driver(&printer_driver);
|
|
if (status) {
|
|
class_destroy(usb_gadget_class);
|
|
unregister_chrdev_region(g_printer_devno, 1);
|
|
DBG(dev, "usb_gadget_register_driver %x\n", status);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
module_init(init);
|
|
|
|
static void __exit
|
|
cleanup(void)
|
|
{
|
|
int status;
|
|
|
|
mutex_lock(&usb_printer_gadget.lock_printer_io);
|
|
class_destroy(usb_gadget_class);
|
|
unregister_chrdev_region(g_printer_devno, 2);
|
|
|
|
status = usb_gadget_unregister_driver(&printer_driver);
|
|
if (status)
|
|
ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
|
|
|
|
mutex_unlock(&usb_printer_gadget.lock_printer_io);
|
|
}
|
|
module_exit(cleanup);
|