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linux/drivers/usb/gadget/printer.c

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/*
* printer.c -- Printer gadget driver
*
* Copyright (C) 2003-2005 David Brownell
* Copyright (C) 2006 Craig W. Nadler
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/cdev.h>
#include <asm/byteorder.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/g_printer.h>
#include "gadget_chips.h"
/*
* Kbuild is not very cooperative with respect to linking separately
* compiled library objects into one module. So for now we won't use
* separate compilation ... ensuring init/exit sections work to shrink
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#include "composite.c"
#include "usbstring.c"
#include "config.c"
#include "epautoconf.c"
/*-------------------------------------------------------------------------*/
#define DRIVER_DESC "Printer Gadget"
#define DRIVER_VERSION "2007 OCT 06"
static DEFINE_MUTEX(printer_mutex);
static const char shortname [] = "printer";
static const char driver_desc [] = DRIVER_DESC;
static dev_t g_printer_devno;
static struct class *usb_gadget_class;
/*-------------------------------------------------------------------------*/
struct printer_dev {
spinlock_t lock; /* lock this structure */
/* lock buffer lists during read/write calls */
struct mutex lock_printer_io;
struct usb_gadget *gadget;
s8 interface;
struct usb_ep *in_ep, *out_ep;
struct list_head rx_reqs; /* List of free RX structs */
struct list_head rx_reqs_active; /* List of Active RX xfers */
struct list_head rx_buffers; /* List of completed xfers */
/* wait until there is data to be read. */
wait_queue_head_t rx_wait;
struct list_head tx_reqs; /* List of free TX structs */
struct list_head tx_reqs_active; /* List of Active TX xfers */
/* Wait until there are write buffers available to use. */
wait_queue_head_t tx_wait;
/* Wait until all write buffers have been sent. */
wait_queue_head_t tx_flush_wait;
struct usb_request *current_rx_req;
size_t current_rx_bytes;
u8 *current_rx_buf;
u8 printer_status;
u8 reset_printer;
struct cdev printer_cdev;
struct device *pdev;
u8 printer_cdev_open;
wait_queue_head_t wait;
struct usb_function function;
};
static struct printer_dev usb_printer_gadget;
/*-------------------------------------------------------------------------*/
/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
/* Thanks to NetChip Technologies for donating this product ID.
*/
#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */
#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */
/* Some systems will want different product identifiers published in the
* device descriptor, either numbers or strings or both. These string
* parameters are in UTF-8 (superset of ASCII's 7 bit characters).
*/
static char *iSerialNum;
module_param(iSerialNum, charp, S_IRUGO);
MODULE_PARM_DESC(iSerialNum, "1");
static char *iPNPstring;
module_param(iPNPstring, charp, S_IRUGO);
MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
/* Number of requests to allocate per endpoint, not used for ep0. */
static unsigned qlen = 10;
module_param(qlen, uint, S_IRUGO|S_IWUSR);
#define QLEN qlen
/*-------------------------------------------------------------------------*/
/*
* DESCRIPTORS ... most are static, but strings and (full) configuration
* descriptors are built on demand.
*/
#define STRING_MANUFACTURER 1
#define STRING_PRODUCT 2
#define STRING_SERIALNUM 3
/* holds our biggest descriptor */
#define USB_DESC_BUFSIZE 256
#define USB_BUFSIZE 8192
/* This device advertises one configuration. */
#define DEV_CONFIG_VALUE 1
#define PRINTER_INTERFACE 0
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_PER_INTERFACE,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.idVendor = cpu_to_le16(PRINTER_VENDOR_NUM),
.idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM),
.iManufacturer = STRING_MANUFACTURER,
.iProduct = STRING_PRODUCT,
.iSerialNumber = STRING_SERIALNUM,
.bNumConfigurations = 1
};
static struct usb_interface_descriptor intf_desc = {
.bLength = sizeof intf_desc,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = PRINTER_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_PRINTER,
.bInterfaceSubClass = 1, /* Printer Sub-Class */
.bInterfaceProtocol = 2, /* Bi-Directional */
.iInterface = 0
};
static struct usb_endpoint_descriptor fs_ep_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK
};
static struct usb_endpoint_descriptor fs_ep_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK
};
static struct usb_descriptor_header *fs_printer_function[] = {
(struct usb_descriptor_header *) &intf_desc,
(struct usb_descriptor_header *) &fs_ep_in_desc,
(struct usb_descriptor_header *) &fs_ep_out_desc,
NULL
};
/*
* usb 2.0 devices need to expose both high speed and full speed
* descriptors, unless they only run at full speed.
*/
static struct usb_endpoint_descriptor hs_ep_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512)
};
static struct usb_endpoint_descriptor hs_ep_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512)
};
static struct usb_qualifier_descriptor dev_qualifier = {
.bLength = sizeof dev_qualifier,
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_PRINTER,
.bNumConfigurations = 1
};
static struct usb_descriptor_header *hs_printer_function[] = {
(struct usb_descriptor_header *) &intf_desc,
(struct usb_descriptor_header *) &hs_ep_in_desc,
(struct usb_descriptor_header *) &hs_ep_out_desc,
NULL
};
static struct usb_otg_descriptor otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
.bmAttributes = USB_OTG_SRP,
};
static const struct usb_descriptor_header *otg_desc[] = {
(struct usb_descriptor_header *) &otg_descriptor,
NULL,
};
/* maxpacket and other transfer characteristics vary by speed. */
#define ep_desc(g, hs, fs) (((g)->speed == USB_SPEED_HIGH)?(hs):(fs))
/*-------------------------------------------------------------------------*/
/* descriptors that are built on-demand */
static char manufacturer [50];
static char product_desc [40] = DRIVER_DESC;
static char serial_num [40] = "1";
static char pnp_string [1024] =
"XXMFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
/* static strings, in UTF-8 */
static struct usb_string strings [] = {
{ STRING_MANUFACTURER, manufacturer, },
{ STRING_PRODUCT, product_desc, },
{ STRING_SERIALNUM, serial_num, },
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
/*-------------------------------------------------------------------------*/
static struct usb_request *
printer_req_alloc(struct usb_ep *ep, unsigned len, gfp_t gfp_flags)
{
struct usb_request *req;
req = usb_ep_alloc_request(ep, gfp_flags);
if (req != NULL) {
req->length = len;
req->buf = kmalloc(len, gfp_flags);
if (req->buf == NULL) {
usb_ep_free_request(ep, req);
return NULL;
}
}
return req;
}
static void
printer_req_free(struct usb_ep *ep, struct usb_request *req)
{
if (ep != NULL && req != NULL) {
kfree(req->buf);
usb_ep_free_request(ep, req);
}
}
/*-------------------------------------------------------------------------*/
static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
struct printer_dev *dev = ep->driver_data;
int status = req->status;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
list_del_init(&req->list); /* Remode from Active List */
switch (status) {
/* normal completion */
case 0:
if (req->actual > 0) {
list_add_tail(&req->list, &dev->rx_buffers);
DBG(dev, "G_Printer : rx length %d\n", req->actual);
} else {
list_add(&req->list, &dev->rx_reqs);
}
break;
/* software-driven interface shutdown */
case -ECONNRESET: /* unlink */
case -ESHUTDOWN: /* disconnect etc */
VDBG(dev, "rx shutdown, code %d\n", status);
list_add(&req->list, &dev->rx_reqs);
break;
/* for hardware automagic (such as pxa) */
case -ECONNABORTED: /* endpoint reset */
DBG(dev, "rx %s reset\n", ep->name);
list_add(&req->list, &dev->rx_reqs);
break;
/* data overrun */
case -EOVERFLOW:
/* FALLTHROUGH */
default:
DBG(dev, "rx status %d\n", status);
list_add(&req->list, &dev->rx_reqs);
break;
}
wake_up_interruptible(&dev->rx_wait);
spin_unlock_irqrestore(&dev->lock, flags);
}
static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
struct printer_dev *dev = ep->driver_data;
switch (req->status) {
default:
VDBG(dev, "tx err %d\n", req->status);
/* FALLTHROUGH */
case -ECONNRESET: /* unlink */
case -ESHUTDOWN: /* disconnect etc */
break;
case 0:
break;
}
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);
spin_unlock(&dev->lock);
}
/*-------------------------------------------------------------------------*/
static int
printer_open(struct inode *inode, struct file *fd)
{
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(&current_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(&current_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, loff_t start, loff_t end, int datasync)
{
struct printer_dev *dev = fd->private_data;
struct inode *inode = fd->f_path.dentry->d_inode;
unsigned long flags;
int tx_list_empty;
mutex_lock(&inode->i_mutex);
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))));
}
mutex_unlock(&inode->i_mutex);
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,
.llseek = noop_llseek,
};
/*-------------------------------------------------------------------------*/
static int
set_printer_interface(struct printer_dev *dev)
{
int result = 0;
dev->in_ep->desc = ep_desc(dev->gadget, &hs_ep_in_desc, &fs_ep_in_desc);
dev->in_ep->driver_data = dev;
dev->out_ep->desc = 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);
if (result != 0) {
DBG(dev, "enable %s --> %d\n", dev->in_ep->name, result);
goto done;
}
result = usb_ep_enable(dev->out_ep);
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_ep->desc = NULL;
dev->out_ep->desc = 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_ep->desc)
usb_ep_disable(dev->in_ep);
if (dev->out_ep->desc)
usb_ep_disable(dev->out_ep);
dev->in_ep->desc = NULL;
dev->out_ep->desc = NULL;
dev->interface = -1;
}
/* 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_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))
DBG(dev, "Failed to enable USB in_ep\n");
if (usb_ep_enable(dev->out_ep))
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_func_setup(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct printer_dev *dev = container_of(f, struct printer_dev, function);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->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);
switch (ctrl->bRequestType&USB_TYPE_MASK) {
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;
}
/* host either stalls (value < 0) or reports success */
return value;
}
static int __init printer_func_bind(struct usb_configuration *c,
struct usb_function *f)
{
return 0;
}
static void printer_func_unbind(struct usb_configuration *c,
struct usb_function *f)
{
}
static int printer_func_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct printer_dev *dev = container_of(f, struct printer_dev, function);
int ret = -ENOTSUPP;
if (!alt)
ret = set_interface(dev, PRINTER_INTERFACE);
return ret;
}
static void printer_func_disable(struct usb_function *f)
{
struct printer_dev *dev = container_of(f, struct printer_dev, function);
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_cfg_unbind(struct usb_configuration *c)
{
struct printer_dev *dev;
struct usb_request *req;
dev = &usb_printer_gadget;
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);
}
}
static struct usb_configuration printer_cfg_driver = {
.label = "printer",
.unbind = printer_cfg_unbind,
.bConfigurationValue = 1,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
};
static int __init printer_bind_config(struct usb_configuration *c)
{
struct usb_gadget *gadget = c->cdev->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;
dev->function.name = shortname;
dev->function.descriptors = fs_printer_function;
dev->function.hs_descriptors = hs_printer_function;
dev->function.bind = printer_func_bind;
dev->function.setup = printer_func_setup;
dev->function.unbind = printer_func_unbind;
dev->function.set_alt = printer_func_set_alt;
dev->function.disable = printer_func_disable;
/* 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);
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 */
/* assumes 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;
usb_gadget_set_selfpowered(gadget);
if (gadget->is_otg) {
otg_descriptor.bmAttributes |= USB_OTG_HNP;
printer_cfg_driver.descriptors = otg_desc;
printer_cfg_driver.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->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;
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);
}
/* finish hookup to lower layer ... */
dev->gadget = gadget;
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_cfg_unbind(c);
return status;
}
static int printer_unbind(struct usb_composite_dev *cdev)
{
return 0;
}
static int __init printer_bind(struct usb_composite_dev *cdev)
{
return usb_add_config(cdev, &printer_cfg_driver, printer_bind_config);
}
static struct usb_composite_driver printer_driver = {
.name = shortname,
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_HIGH,
.unbind = printer_unbind,
};
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);
pr_err("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) {
pr_err("alloc_chrdev_region %d\n", status);
class_destroy(usb_gadget_class);
return status;
}
status = usb_composite_probe(&printer_driver, printer_bind);
if (status) {
class_destroy(usb_gadget_class);
unregister_chrdev_region(g_printer_devno, 1);
pr_err("usb_gadget_probe_driver %x\n", status);
}
return status;
}
module_init(init);
static void __exit
cleanup(void)
{
mutex_lock(&usb_printer_gadget.lock_printer_io);
usb_composite_unregister(&printer_driver);
unregister_chrdev_region(g_printer_devno, 1);
class_destroy(usb_gadget_class);
mutex_unlock(&usb_printer_gadget.lock_printer_io);
}
module_exit(cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Craig Nadler");
MODULE_LICENSE("GPL");
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