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1552 lines
38 KiB
1552 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* f_printer.c - USB printer function driver |
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* |
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* Copied from drivers/usb/gadget/legacy/printer.c, |
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* which was: |
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* |
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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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|
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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/idr.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/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 <linux/kref.h> |
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|
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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 <linux/uaccess.h> |
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#include <asm/unaligned.h> |
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|
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#include <linux/usb/ch9.h> |
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#include <linux/usb/composite.h> |
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#include <linux/usb/gadget.h> |
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#include <linux/usb/g_printer.h> |
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|
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#include "u_printer.h" |
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|
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#define PRINTER_MINORS 4 |
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#define GET_DEVICE_ID 0 |
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#define GET_PORT_STATUS 1 |
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#define SOFT_RESET 2 |
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|
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#define DEFAULT_Q_LEN 10 /* same as legacy g_printer gadget */ |
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|
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static int major, minors; |
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static struct class *usb_gadget_class; |
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static DEFINE_IDA(printer_ida); |
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static DEFINE_MUTEX(printer_ida_lock); /* protects access do printer_ida */ |
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|
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/*-------------------------------------------------------------------------*/ |
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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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s8 interface; |
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struct usb_ep *in_ep, *out_ep; |
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struct kref kref; |
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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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int minor; |
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struct cdev printer_cdev; |
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u8 printer_cdev_open; |
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wait_queue_head_t wait; |
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unsigned q_len; |
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char *pnp_string; /* We don't own memory! */ |
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struct usb_function function; |
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}; |
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|
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static inline struct printer_dev *func_to_printer(struct usb_function *f) |
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{ |
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return container_of(f, struct printer_dev, function); |
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} |
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|
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/*-------------------------------------------------------------------------*/ |
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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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|
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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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|
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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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.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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|
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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 struct usb_descriptor_header *fs_printer_function[] = { |
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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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|
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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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|
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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_descriptor_header *hs_printer_function[] = { |
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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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|
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/* |
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* Added endpoint descriptors for 3.0 devices |
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*/ |
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static struct usb_endpoint_descriptor ss_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(1024), |
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}; |
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|
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static struct usb_ss_ep_comp_descriptor ss_ep_in_comp_desc = { |
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.bLength = sizeof(ss_ep_in_comp_desc), |
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
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}; |
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static struct usb_endpoint_descriptor ss_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(1024), |
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}; |
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|
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static struct usb_ss_ep_comp_descriptor ss_ep_out_comp_desc = { |
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.bLength = sizeof(ss_ep_out_comp_desc), |
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
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}; |
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|
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static struct usb_descriptor_header *ss_printer_function[] = { |
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(struct usb_descriptor_header *) &intf_desc, |
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(struct usb_descriptor_header *) &ss_ep_in_desc, |
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(struct usb_descriptor_header *) &ss_ep_in_comp_desc, |
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(struct usb_descriptor_header *) &ss_ep_out_desc, |
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(struct usb_descriptor_header *) &ss_ep_out_comp_desc, |
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NULL |
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}; |
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|
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/* maxpacket and other transfer characteristics vary by speed. */ |
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static inline struct usb_endpoint_descriptor *ep_desc(struct usb_gadget *gadget, |
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struct usb_endpoint_descriptor *fs, |
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struct usb_endpoint_descriptor *hs, |
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struct usb_endpoint_descriptor *ss) |
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{ |
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switch (gadget->speed) { |
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case USB_SPEED_SUPER: |
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return ss; |
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case USB_SPEED_HIGH: |
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return hs; |
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default: |
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return fs; |
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} |
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} |
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|
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/*-------------------------------------------------------------------------*/ |
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|
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static void printer_dev_free(struct kref *kref) |
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{ |
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struct printer_dev *dev = container_of(kref, struct printer_dev, kref); |
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|
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kfree(dev); |
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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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|
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req = usb_ep_alloc_request(ep, gfp_flags); |
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|
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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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|
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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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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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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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} |
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spin_lock(&dev->lock); |
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/* Take the request struct off the active list and put it on the |
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* free list. |
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*/ |
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list_del_init(&req->list); |
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list_add(&req->list, &dev->tx_reqs); |
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wake_up_interruptible(&dev->tx_wait); |
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if (likely(list_empty(&dev->tx_reqs_active))) |
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wake_up_interruptible(&dev->tx_flush_wait); |
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spin_unlock(&dev->lock); |
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} |
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/*-------------------------------------------------------------------------*/ |
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static int |
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printer_open(struct inode *inode, struct file *fd) |
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{ |
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struct printer_dev *dev; |
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unsigned long flags; |
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int ret = -EBUSY; |
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dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev); |
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spin_lock_irqsave(&dev->lock, flags); |
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if (dev->interface < 0) { |
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spin_unlock_irqrestore(&dev->lock, flags); |
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return -ENODEV; |
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} |
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if (!dev->printer_cdev_open) { |
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dev->printer_cdev_open = 1; |
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fd->private_data = dev; |
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ret = 0; |
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/* Change the printer status to show that it's on-line. */ |
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dev->printer_status |= PRINTER_SELECTED; |
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} |
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spin_unlock_irqrestore(&dev->lock, flags); |
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kref_get(&dev->kref); |
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DBG(dev, "printer_open returned %x\n", ret); |
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return ret; |
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} |
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|
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static int |
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printer_close(struct inode *inode, struct file *fd) |
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{ |
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struct printer_dev *dev = fd->private_data; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&dev->lock, flags); |
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dev->printer_cdev_open = 0; |
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fd->private_data = NULL; |
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/* Change printer status to show that the printer is off-line. */ |
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dev->printer_status &= ~PRINTER_SELECTED; |
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spin_unlock_irqrestore(&dev->lock, flags); |
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kref_put(&dev->kref, printer_dev_free); |
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DBG(dev, "printer_close\n"); |
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return 0; |
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} |
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|
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/* This function must be called with interrupts turned off. */ |
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static void |
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setup_rx_reqs(struct printer_dev *dev) |
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{ |
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struct usb_request *req; |
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|
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while (likely(!list_empty(&dev->rx_reqs))) { |
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int error; |
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req = container_of(dev->rx_reqs.next, |
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struct usb_request, list); |
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list_del_init(&req->list); |
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|
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/* The USB Host sends us whatever amount of data it wants to |
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* so we always set the length field to the full USB_BUFSIZE. |
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* If the amount of data is more than the read() caller asked |
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* for it will be stored in the request buffer until it is |
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* asked for by read(). |
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*/ |
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req->length = USB_BUFSIZE; |
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req->complete = rx_complete; |
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|
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/* here, we unlock, and only unlock, to avoid deadlock. */ |
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spin_unlock(&dev->lock); |
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error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC); |
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spin_lock(&dev->lock); |
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if (error) { |
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DBG(dev, "rx submit --> %d\n", error); |
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list_add(&req->list, &dev->rx_reqs); |
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break; |
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} |
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/* if the req is empty, then add it into dev->rx_reqs_active. */ |
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else if (list_empty(&req->list)) |
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list_add(&req->list, &dev->rx_reqs_active); |
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} |
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} |
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|
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static ssize_t |
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printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr) |
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{ |
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struct printer_dev *dev = fd->private_data; |
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unsigned long flags; |
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size_t size; |
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size_t bytes_copied; |
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struct usb_request *req; |
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/* This is a pointer to the current USB rx request. */ |
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struct usb_request *current_rx_req; |
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/* This is the number of bytes in the current rx buffer. */ |
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size_t current_rx_bytes; |
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/* This is a pointer to the current rx buffer. */ |
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u8 *current_rx_buf; |
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|
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if (len == 0) |
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return -EINVAL; |
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|
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DBG(dev, "printer_read trying to read %d bytes\n", (int)len); |
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|
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mutex_lock(&dev->lock_printer_io); |
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spin_lock_irqsave(&dev->lock, flags); |
|
|
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if (dev->interface < 0) { |
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spin_unlock_irqrestore(&dev->lock, flags); |
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mutex_unlock(&dev->lock_printer_io); |
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return -ENODEV; |
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} |
|
|
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/* We will use this flag later to check if a printer reset happened |
|
* after we turn interrupts back on. |
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*/ |
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dev->reset_printer = 0; |
|
|
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setup_rx_reqs(dev); |
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|
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bytes_copied = 0; |
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current_rx_req = dev->current_rx_req; |
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current_rx_bytes = dev->current_rx_bytes; |
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current_rx_buf = dev->current_rx_buf; |
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dev->current_rx_req = NULL; |
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dev->current_rx_bytes = 0; |
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dev->current_rx_buf = NULL; |
|
|
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/* 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. |
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*/ |
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if ((current_rx_bytes == 0) && |
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(likely(list_empty(&dev->rx_buffers)))) { |
|
/* Turn interrupts back on before sleeping. */ |
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spin_unlock_irqrestore(&dev->lock, flags); |
|
|
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/* |
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* If no data is available check if this is a NON-Blocking |
|
* call or not. |
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*/ |
|
if (fd->f_flags & (O_NONBLOCK|O_NDELAY)) { |
|
mutex_unlock(&dev->lock_printer_io); |
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return -EAGAIN; |
|
} |
|
|
|
/* Sleep until data is available */ |
|
wait_event_interruptible(dev->rx_wait, |
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(likely(!list_empty(&dev->rx_buffers)))); |
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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_del(&req->list); |
|
list_add(&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->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) |
|
{ |
|
unsigned long flags; |
|
|
|
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); |
|
|
|
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; |
|
|
|
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); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
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, NULL); |
|
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); |
|
|
|
DBG(dev, "%s\n", __func__); |
|
|
|
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 = strlcpy(page, opts->pnp_string, PAGE_SIZE); |
|
if (result >= PAGE_SIZE) { |
|
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; |
|
|
|
usb_gadget_class = class_create(THIS_MODULE, "usb_printer_gadget"); |
|
if (IS_ERR(usb_gadget_class)) { |
|
status = PTR_ERR(usb_gadget_class); |
|
usb_gadget_class = NULL; |
|
pr_err("unable to create usb_gadget class %d\n", status); |
|
return status; |
|
} |
|
|
|
status = alloc_chrdev_region(&devt, 0, count, "USB printer gadget"); |
|
if (status) { |
|
pr_err("alloc_chrdev_region %d\n", status); |
|
class_destroy(usb_gadget_class); |
|
usb_gadget_class = NULL; |
|
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_destroy(usb_gadget_class); |
|
usb_gadget_class = NULL; |
|
}
|
|
|