| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * f_printer.c - USB printer function driver |
| * |
| * Copied from drivers/usb/gadget/legacy/printer.c, |
| * which was: |
| * |
| * printer.c -- Printer gadget driver |
| * |
| * Copyright (C) 2003-2005 David Brownell |
| * Copyright (C) 2006 Craig W. Nadler |
| */ |
| |
| #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/idr.h> |
| #include <linux/timer.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.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 <linux/kref.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/composite.h> |
| #include <linux/usb/gadget.h> |
| #include <linux/usb/g_printer.h> |
| |
| #include "u_printer.h" |
| |
| #define PRINTER_MINORS 4 |
| #define GET_DEVICE_ID 0 |
| #define GET_PORT_STATUS 1 |
| #define SOFT_RESET 2 |
| |
| #define DEFAULT_Q_LEN 10 /* same as legacy g_printer gadget */ |
| |
| static int major, minors; |
| static const struct class usb_gadget_class = { |
| .name = "usb_printer_gadget", |
| }; |
| |
| static DEFINE_IDA(printer_ida); |
| static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */ |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| 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 kref kref; |
| 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; |
| int minor; |
| struct cdev printer_cdev; |
| u8 printer_cdev_open; |
| wait_queue_head_t wait; |
| unsigned q_len; |
| char **pnp_string; /* We don't own memory! */ |
| struct usb_function function; |
| }; |
| |
| static inline struct printer_dev *func_to_printer(struct usb_function *f) |
| { |
| return container_of(f, struct printer_dev, function); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * DESCRIPTORS ... most are static, but strings and (full) configuration |
| * descriptors are built on demand. |
| */ |
| |
| /* holds our biggest descriptor */ |
| #define USB_DESC_BUFSIZE 256 |
| #define USB_BUFSIZE 8192 |
| |
| static struct usb_interface_descriptor intf_desc = { |
| .bLength = sizeof(intf_desc), |
| .bDescriptorType = USB_DT_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_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 |
| }; |
| |
| /* |
| * Added endpoint descriptors for 3.0 devices |
| */ |
| |
| static struct usb_endpoint_descriptor ss_ep_in_desc = { |
| .bLength = USB_DT_ENDPOINT_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| .wMaxPacketSize = cpu_to_le16(1024), |
| }; |
| |
| static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = { |
| .bLength = sizeof(ss_ep_in_comp_desc), |
| .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| }; |
| |
| static struct usb_endpoint_descriptor ss_ep_out_desc = { |
| .bLength = USB_DT_ENDPOINT_SIZE, |
| .bDescriptorType = USB_DT_ENDPOINT, |
| .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| .wMaxPacketSize = cpu_to_le16(1024), |
| }; |
| |
| static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = { |
| .bLength = sizeof(ss_ep_out_comp_desc), |
| .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| }; |
| |
| static struct usb_descriptor_header *ss_printer_function[] = { |
| (struct usb_descriptor_header *) &intf_desc, |
| (struct usb_descriptor_header *) &ss_ep_in_desc, |
| (struct usb_descriptor_header *) &ss_ep_in_comp_desc, |
| (struct usb_descriptor_header *) &ss_ep_out_desc, |
| (struct usb_descriptor_header *) &ss_ep_out_comp_desc, |
| NULL |
| }; |
| |
| /* maxpacket and other transfer characteristics vary by speed. */ |
| static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget, |
| struct usb_endpoint_descriptor *fs, |
| struct usb_endpoint_descriptor *hs, |
| struct usb_endpoint_descriptor *ss) |
| { |
| switch (gadget->speed) { |
| case USB_SPEED_SUPER: |
| return ss; |
| case USB_SPEED_HIGH: |
| return hs; |
| default: |
| return fs; |
| } |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void printer_dev_free(struct kref *kref) |
| { |
| struct printer_dev *dev = container_of(kref, struct printer_dev, kref); |
| |
| kfree(dev); |
| } |
| |
| 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; |
| |
| dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| return -ENODEV; |
| } |
| |
| 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); |
| |
| kref_get(&dev->kref); |
| |
| 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); |
| |
| kref_put(&dev->kref, printer_dev_free); |
| |
| 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; |
| |
| /* here, we unlock, and only unlock, to avoid deadlock. */ |
| spin_unlock(&dev->lock); |
| error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); |
| spin_lock(&dev->lock); |
| if (error) { |
| DBG(dev, "rx submit --> %d\n", error); |
| list_add(&req->list, &dev->rx_reqs); |
| break; |
| } |
| /* if the req is empty, then add it into dev->rx_reqs_active. */ |
| else if (list_empty(&req->list)) |
| 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); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| mutex_unlock(&dev->lock_printer_io); |
| return -ENODEV; |
| } |
| |
| /* 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; |
| int value; |
| |
| 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); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| mutex_unlock(&dev->lock_printer_io); |
| return -ENODEV; |
| } |
| |
| /* 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 multiple 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; |
| } |
| |
| list_add(&req->list, &dev->tx_reqs_active); |
| |
| /* here, we unlock, and only unlock, to avoid deadlock. */ |
| spin_unlock(&dev->lock); |
| value = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC); |
| spin_lock(&dev->lock); |
| if (value) { |
| list_move(&req->list, &dev->tx_reqs); |
| spin_unlock_irqrestore(&dev->lock, flags); |
| mutex_unlock(&dev->lock_printer_io); |
| return -EAGAIN; |
| } |
| } |
| |
| 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 = file_inode(fd); |
| unsigned long flags; |
| int tx_list_empty; |
| |
| inode_lock(inode); |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| inode_unlock(inode); |
| return -ENODEV; |
| } |
| |
| 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)))); |
| } |
| inode_unlock(inode); |
| |
| return 0; |
| } |
| |
| static __poll_t |
| printer_poll(struct file *fd, poll_table *wait) |
| { |
| struct printer_dev *dev = fd->private_data; |
| unsigned long flags; |
| __poll_t status = 0; |
| |
| mutex_lock(&dev->lock_printer_io); |
| spin_lock_irqsave(&dev->lock, flags); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| mutex_unlock(&dev->lock_printer_io); |
| return EPOLLERR | EPOLLHUP; |
| } |
| |
| 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 |= EPOLLOUT | EPOLLWRNORM; |
| |
| if (likely(dev->current_rx_bytes) || |
| likely(!list_empty(&dev->rx_buffers))) |
| status |= EPOLLIN | EPOLLRDNORM; |
| |
| 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); |
| |
| if (dev->interface < 0) { |
| spin_unlock_irqrestore(&dev->lock, flags); |
| return -ENODEV; |
| } |
| |
| 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, &fs_ep_in_desc, &hs_ep_in_desc, |
| &ss_ep_in_desc); |
| dev->in_ep->driver_data = dev; |
| |
| dev->out_ep->desc = ep_desc(dev->gadget, &fs_ep_out_desc, |
| &hs_ep_out_desc, &ss_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->out_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) |
| { |
| unsigned long flags; |
| |
| if (dev->interface < 0) |
| return; |
| |
| if (dev->in_ep->desc) |
| usb_ep_disable(dev->in_ep); |
| |
| if (dev->out_ep->desc) |
| usb_ep_disable(dev->out_ep); |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| dev->in_ep->desc = NULL; |
| dev->out_ep->desc = NULL; |
| dev->interface = -1; |
| spin_unlock_irqrestore(&dev->lock, flags); |
| } |
| |
| /* Change our operational Interface. */ |
| static int set_interface(struct printer_dev *dev, unsigned number) |
| { |
| int result = 0; |
| |
| /* Free the current interface */ |
| printer_reset_interface(dev); |
| |
| result = set_printer_interface(dev); |
| if (result) |
| printer_reset_interface(dev); |
| else |
| dev->interface = number; |
| |
| if (!result) |
| INFO(dev, "Using interface %x\n", number); |
| |
| return result; |
| } |
| |
| static void printer_soft_reset(struct printer_dev *dev) |
| { |
| struct usb_request *req; |
| |
| 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); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static bool gprinter_req_match(struct usb_function *f, |
| const struct usb_ctrlrequest *ctrl, |
| bool config0) |
| { |
| struct printer_dev *dev = func_to_printer(f); |
| u16 w_index = le16_to_cpu(ctrl->wIndex); |
| u16 w_value = le16_to_cpu(ctrl->wValue); |
| u16 w_length = le16_to_cpu(ctrl->wLength); |
| |
| if (config0) |
| return false; |
| |
| if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE || |
| (ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) |
| return false; |
| |
| switch (ctrl->bRequest) { |
| case GET_DEVICE_ID: |
| w_index >>= 8; |
| if (USB_DIR_IN & ctrl->bRequestType) |
| break; |
| return false; |
| case GET_PORT_STATUS: |
| if (!w_value && w_length == 1 && |
| (USB_DIR_IN & ctrl->bRequestType)) |
| break; |
| return false; |
| case SOFT_RESET: |
| if (!w_value && !w_length && |
| !(USB_DIR_IN & ctrl->bRequestType)) |
| break; |
| fallthrough; |
| default: |
| return false; |
| } |
| return w_index == dev->interface; |
| } |
| |
| /* |
| * 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 = func_to_printer(f); |
| struct usb_composite_dev *cdev = f->config->cdev; |
| struct usb_request *req = cdev->req; |
| u8 *buf = req->buf; |
| 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 GET_DEVICE_ID: /* Get the IEEE-1284 PNP String */ |
| /* Only one printer interface is supported. */ |
| if ((wIndex>>8) != dev->interface) |
| break; |
| |
| if (!*dev->pnp_string) { |
| value = 0; |
| break; |
| } |
| value = strlen(*dev->pnp_string); |
| buf[0] = (value >> 8) & 0xFF; |
| buf[1] = value & 0xFF; |
| memcpy(buf + 2, *dev->pnp_string, value); |
| DBG(dev, "1284 PNP String: %x %s\n", value, |
| *dev->pnp_string); |
| break; |
| |
| case GET_PORT_STATUS: /* Get Port Status */ |
| /* Only one printer interface is supported. */ |
| if (wIndex != dev->interface) |
| break; |
| |
| buf[0] = dev->printer_status; |
| value = min_t(u16, wLength, 1); |
| break; |
| |
| case SOFT_RESET: /* Soft Reset */ |
| /* Only one printer interface is supported. */ |
| if (wIndex != dev->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 */ |
| if (value >= 0) { |
| req->length = value; |
| req->zero = value < wLength; |
| value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| if (value < 0) { |
| ERROR(dev, "%s:%d Error!\n", __func__, __LINE__); |
| req->status = 0; |
| } |
| } |
| return value; |
| } |
| |
| static int printer_func_bind(struct usb_configuration *c, |
| struct usb_function *f) |
| { |
| struct usb_gadget *gadget = c->cdev->gadget; |
| struct printer_dev *dev = func_to_printer(f); |
| struct device *pdev; |
| struct usb_composite_dev *cdev = c->cdev; |
| struct usb_ep *in_ep; |
| struct usb_ep *out_ep = NULL; |
| struct usb_request *req; |
| dev_t devt; |
| int id; |
| int ret; |
| u32 i; |
| |
| id = usb_interface_id(c, f); |
| if (id < 0) |
| return id; |
| intf_desc.bInterfaceNumber = id; |
| |
| /* finish hookup to lower layer ... */ |
| dev->gadget = gadget; |
| |
| /* all we really need is bulk IN/OUT */ |
| in_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_in_desc); |
| if (!in_ep) { |
| autoconf_fail: |
| dev_err(&cdev->gadget->dev, "can't autoconfigure on %s\n", |
| cdev->gadget->name); |
| return -ENODEV; |
| } |
| |
| out_ep = usb_ep_autoconfig(cdev->gadget, &fs_ep_out_desc); |
| if (!out_ep) |
| goto autoconf_fail; |
| |
| /* 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; |
| ss_ep_in_desc.bEndpointAddress = fs_ep_in_desc.bEndpointAddress; |
| ss_ep_out_desc.bEndpointAddress = fs_ep_out_desc.bEndpointAddress; |
| |
| ret = usb_assign_descriptors(f, fs_printer_function, |
| hs_printer_function, ss_printer_function, |
| ss_printer_function); |
| if (ret) |
| return ret; |
| |
| dev->in_ep = in_ep; |
| dev->out_ep = out_ep; |
| |
| ret = -ENOMEM; |
| for (i = 0; i < dev->q_len; i++) { |
| req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL); |
| if (!req) |
| goto fail_tx_reqs; |
| list_add(&req->list, &dev->tx_reqs); |
| } |
| |
| for (i = 0; i < dev->q_len; i++) { |
| req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL); |
| if (!req) |
| goto fail_rx_reqs; |
| list_add(&req->list, &dev->rx_reqs); |
| } |
| |
| /* Setup the sysfs files for the printer gadget. */ |
| devt = MKDEV(major, dev->minor); |
| pdev = device_create(&usb_gadget_class, NULL, devt, |
| NULL, "g_printer%d", dev->minor); |
| if (IS_ERR(pdev)) { |
| ERROR(dev, "Failed to create device: g_printer\n"); |
| ret = PTR_ERR(pdev); |
| goto fail_rx_reqs; |
| } |
| |
| /* |
| * 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; |
| ret = cdev_add(&dev->printer_cdev, devt, 1); |
| if (ret) { |
| ERROR(dev, "Failed to open char device\n"); |
| goto fail_cdev_add; |
| } |
| |
| return 0; |
| |
| fail_cdev_add: |
| device_destroy(&usb_gadget_class, devt); |
| |
| fail_rx_reqs: |
| 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); |
| } |
| |
| fail_tx_reqs: |
| 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); |
| } |
| |
| usb_free_all_descriptors(f); |
| return ret; |
| |
| } |
| |
| static int printer_func_set_alt(struct usb_function *f, |
| unsigned intf, unsigned alt) |
| { |
| struct printer_dev *dev = func_to_printer(f); |
| int ret = -ENOTSUPP; |
| |
| if (!alt) |
| ret = set_interface(dev, intf); |
| |
| return ret; |
| } |
| |
| static void printer_func_disable(struct usb_function *f) |
| { |
| struct printer_dev *dev = func_to_printer(f); |
| |
| printer_reset_interface(dev); |
| } |
| |
| static inline struct f_printer_opts |
| *to_f_printer_opts(struct config_item *item) |
| { |
| return container_of(to_config_group(item), struct f_printer_opts, |
| func_inst.group); |
| } |
| |
| static void printer_attr_release(struct config_item *item) |
| { |
| struct f_printer_opts *opts = to_f_printer_opts(item); |
| |
| usb_put_function_instance(&opts->func_inst); |
| } |
| |
| static struct configfs_item_operations printer_item_ops = { |
| .release = printer_attr_release, |
| }; |
| |
| static ssize_t f_printer_opts_pnp_string_show(struct config_item *item, |
| char *page) |
| { |
| struct f_printer_opts *opts = to_f_printer_opts(item); |
| int result = 0; |
| |
| mutex_lock(&opts->lock); |
| if (!opts->pnp_string) |
| goto unlock; |
| |
| result = strscpy(page, opts->pnp_string, PAGE_SIZE); |
| if (result < 1) { |
| result = PAGE_SIZE; |
| } else if (page[result - 1] != '\n' && result + 1 < PAGE_SIZE) { |
| page[result++] = '\n'; |
| page[result] = '\0'; |
| } |
| |
| unlock: |
| mutex_unlock(&opts->lock); |
| |
| return result; |
| } |
| |
| static ssize_t f_printer_opts_pnp_string_store(struct config_item *item, |
| const char *page, size_t len) |
| { |
| struct f_printer_opts *opts = to_f_printer_opts(item); |
| char *new_pnp; |
| int result; |
| |
| mutex_lock(&opts->lock); |
| |
| new_pnp = kstrndup(page, len, GFP_KERNEL); |
| if (!new_pnp) { |
| result = -ENOMEM; |
| goto unlock; |
| } |
| |
| if (opts->pnp_string_allocated) |
| kfree(opts->pnp_string); |
| |
| opts->pnp_string_allocated = true; |
| opts->pnp_string = new_pnp; |
| result = len; |
| unlock: |
| mutex_unlock(&opts->lock); |
| |
| return result; |
| } |
| |
| CONFIGFS_ATTR(f_printer_opts_, pnp_string); |
| |
| static ssize_t f_printer_opts_q_len_show(struct config_item *item, |
| char *page) |
| { |
| struct f_printer_opts *opts = to_f_printer_opts(item); |
| int result; |
| |
| mutex_lock(&opts->lock); |
| result = sprintf(page, "%d\n", opts->q_len); |
| mutex_unlock(&opts->lock); |
| |
| return result; |
| } |
| |
| static ssize_t f_printer_opts_q_len_store(struct config_item *item, |
| const char *page, size_t len) |
| { |
| struct f_printer_opts *opts = to_f_printer_opts(item); |
| int ret; |
| u16 num; |
| |
| mutex_lock(&opts->lock); |
| if (opts->refcnt) { |
| ret = -EBUSY; |
| goto end; |
| } |
| |
| ret = kstrtou16(page, 0, &num); |
| if (ret) |
| goto end; |
| |
| opts->q_len = (unsigned)num; |
| ret = len; |
| end: |
| mutex_unlock(&opts->lock); |
| return ret; |
| } |
| |
| CONFIGFS_ATTR(f_printer_opts_, q_len); |
| |
| static struct configfs_attribute *printer_attrs[] = { |
| &f_printer_opts_attr_pnp_string, |
| &f_printer_opts_attr_q_len, |
| NULL, |
| }; |
| |
| static const struct config_item_type printer_func_type = { |
| .ct_item_ops = &printer_item_ops, |
| .ct_attrs = printer_attrs, |
| .ct_owner = THIS_MODULE, |
| }; |
| |
| static inline int gprinter_get_minor(void) |
| { |
| int ret; |
| |
| ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL); |
| if (ret >= PRINTER_MINORS) { |
| ida_simple_remove(&printer_ida, ret); |
| ret = -ENODEV; |
| } |
| |
| return ret; |
| } |
| |
| static inline void gprinter_put_minor(int minor) |
| { |
| ida_simple_remove(&printer_ida, minor); |
| } |
| |
| static int gprinter_setup(int); |
| static void gprinter_cleanup(void); |
| |
| static void gprinter_free_inst(struct usb_function_instance *f) |
| { |
| struct f_printer_opts *opts; |
| |
| opts = container_of(f, struct f_printer_opts, func_inst); |
| |
| mutex_lock(&printer_ida_lock); |
| |
| gprinter_put_minor(opts->minor); |
| if (ida_is_empty(&printer_ida)) |
| gprinter_cleanup(); |
| |
| mutex_unlock(&printer_ida_lock); |
| |
| if (opts->pnp_string_allocated) |
| kfree(opts->pnp_string); |
| kfree(opts); |
| } |
| |
| static struct usb_function_instance *gprinter_alloc_inst(void) |
| { |
| struct f_printer_opts *opts; |
| struct usb_function_instance *ret; |
| int status = 0; |
| |
| opts = kzalloc(sizeof(*opts), GFP_KERNEL); |
| if (!opts) |
| return ERR_PTR(-ENOMEM); |
| |
| mutex_init(&opts->lock); |
| opts->func_inst.free_func_inst = gprinter_free_inst; |
| ret = &opts->func_inst; |
| |
| /* Make sure q_len is initialized, otherwise the bound device can't support read/write! */ |
| opts->q_len = DEFAULT_Q_LEN; |
| |
| mutex_lock(&printer_ida_lock); |
| |
| if (ida_is_empty(&printer_ida)) { |
| status = gprinter_setup(PRINTER_MINORS); |
| if (status) { |
| ret = ERR_PTR(status); |
| kfree(opts); |
| goto unlock; |
| } |
| } |
| |
| opts->minor = gprinter_get_minor(); |
| if (opts->minor < 0) { |
| ret = ERR_PTR(opts->minor); |
| kfree(opts); |
| if (ida_is_empty(&printer_ida)) |
| gprinter_cleanup(); |
| goto unlock; |
| } |
| config_group_init_type_name(&opts->func_inst.group, "", |
| &printer_func_type); |
| |
| unlock: |
| mutex_unlock(&printer_ida_lock); |
| return ret; |
| } |
| |
| static void gprinter_free(struct usb_function *f) |
| { |
| struct printer_dev *dev = func_to_printer(f); |
| struct f_printer_opts *opts; |
| |
| opts = container_of(f->fi, struct f_printer_opts, func_inst); |
| |
| kref_put(&dev->kref, printer_dev_free); |
| mutex_lock(&opts->lock); |
| --opts->refcnt; |
| mutex_unlock(&opts->lock); |
| } |
| |
| static void printer_func_unbind(struct usb_configuration *c, |
| struct usb_function *f) |
| { |
| struct printer_dev *dev; |
| struct usb_request *req; |
| |
| dev = func_to_printer(f); |
| |
| device_destroy(&usb_gadget_class, MKDEV(major, dev->minor)); |
| |
| /* 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); |
| } |
| usb_free_all_descriptors(f); |
| } |
| |
| static struct usb_function *gprinter_alloc(struct usb_function_instance *fi) |
| { |
| struct printer_dev *dev; |
| struct f_printer_opts *opts; |
| |
| opts = container_of(fi, struct f_printer_opts, func_inst); |
| |
| mutex_lock(&opts->lock); |
| if (opts->minor >= minors) { |
| mutex_unlock(&opts->lock); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) { |
| mutex_unlock(&opts->lock); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| kref_init(&dev->kref); |
| ++opts->refcnt; |
| dev->minor = opts->minor; |
| dev->pnp_string = &opts->pnp_string; |
| dev->q_len = opts->q_len; |
| mutex_unlock(&opts->lock); |
| |
| dev->function.name = "printer"; |
| 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; |
| dev->function.req_match = gprinter_req_match; |
| dev->function.free_func = gprinter_free; |
| |
| INIT_LIST_HEAD(&dev->tx_reqs); |
| INIT_LIST_HEAD(&dev->rx_reqs); |
| INIT_LIST_HEAD(&dev->rx_buffers); |
| INIT_LIST_HEAD(&dev->tx_reqs_active); |
| INIT_LIST_HEAD(&dev->rx_reqs_active); |
| |
| spin_lock_init(&dev->lock); |
| mutex_init(&dev->lock_printer_io); |
| 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; |
| |
| return &dev->function; |
| } |
| |
| DECLARE_USB_FUNCTION_INIT(printer, gprinter_alloc_inst, gprinter_alloc); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Craig Nadler"); |
| |
| static int gprinter_setup(int count) |
| { |
| int status; |
| dev_t devt; |
| |
| status = class_register(&usb_gadget_class); |
| if (status) |
| return status; |
| |
| status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget"); |
| if (status) { |
| pr_err("alloc_chrdev_region %d\n", status); |
| class_unregister(&usb_gadget_class); |
| return status; |
| } |
| |
| major = MAJOR(devt); |
| minors = count; |
| |
| return status; |
| } |
| |
| static void gprinter_cleanup(void) |
| { |
| if (major) { |
| unregister_chrdev_region(MKDEV(major, 0), minors); |
| major = minors = 0; |
| } |
| class_unregister(&usb_gadget_class); |
| } |