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kernel_samsung_a34x-permissive/drivers/usb/gadget/function/f_mtp_samsung.c
Fede2782 c05564c4d8
Import A346BXXU1AWB9 kernel source 
Android 13
2024-04-28 15:49:01 +02:00

2213 lines
57 KiB
C
Executable file
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/*
* drivers/usb/gadget/f_mtp_samsung.c
*
* Function Driver for USB MTP,
* f_mtp_samsung.c -- MTP Driver, for MTP development,
*
* Copyright (C) 2009 by Samsung Electronics,
* Author:Deepak M.G. <deepak.guru@samsung.com>,
* Author:Madhukar.J <madhukar.j@samsung.com>,
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* f_mtp_samsung.c file is the driver for MTP device. Totally three
* EndPoints will be configured in which 2 Bulk End Points
* and 1 Interrupt End point. This driver will also register as
* misc driver and exposes file operation funtions to user space.
*/
/* Includes */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/usb_usual.h>
#include <linux/usb/ch9.h>
#include <linux/usb/composite.h>
#include <linux/usb/gadget.h>
#include <linux/hardirq.h>
#include <linux/sched.h>
#include <linux/usb/f_accessory.h>
#include <asm-generic/siginfo.h>
#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/configfs.h>
#include <linux/sched/signal.h>
#include "f_mtp.h"
#include "configfs.h"
#ifdef CONFIG_MEDIATEK_SOLUTION
#include "usb_boost.h"
#endif
/*-------------------------------------------------------------------------*/
/*Only for Debug*/
#define DEBUG_MTP 0
/*#define CSY_TEST */
#if DEBUG_MTP
#define DEBUG_MTP_SETUP
#define DEBUG_MTP_READ
#define DEBUG_MTP_WRITE
#else
#undef DEBUG_MTP_SETUP
#undef DEBUG_MTP_READ
#undef DEBUG_MTP_WRITE
#endif
/*#define DEBUG_MTP_SETUP*/
/*#define DEBUG_MTP_READ*/
/*#define DEBUG_MTP_WRITE*/
#ifdef DEBUG_MTP_SETUP
#define DEBUG_MTPB(fmt, args...) printk(fmt, ##args)
#else
#define DEBUG_MTPB(fmt, args...) do {} while (0)
#endif
#ifdef DEBUG_MTP_READ
#define DEBUG_MTPR(fmt, args...) printk(fmt, ##args)
#else
#define DEBUG_MTPR(fmt, args...) do {} while (0)
#endif
#ifdef DEBUG_MTP_WRITE
#define DEBUG_MTPW(fmt, args...) printk(fmt, ##args)
#else
#define DEBUG_MTPW(fmt, args...) do {} while (0)
#endif
/*-------------------------------------------------------------------------*/
#define MTPG_BULK_BUFFER_SIZE 32768
#define MTPG_INTR_BUFFER_SIZE 28
/* number of rx and tx requests to allocate */
#define MTPG_RX_REQ_MAX 8
#define MTPG_MTPG_TX_REQ_MAX 8
#define MTPG_INTR_REQ_MAX 5
/* ID for Microsoft MTP OS String */
#define MTPG_OS_STRING_ID 0xEE
#define INTR_BUFFER_SIZE 28
#define MAX_INST_NAME_LEN 40
#define DRIVER_NAME "usb_mtp_gadget"
#if IS_ENABLED(CONFIG_USB_CONFIGFS_UEVENT)
#define DRIVER_NAME_PTP "ptp"
#endif
#define MAX_GUID_SIZE 0x28
static const char mtpg_longname[] = "mtp";
static const char shortname[] = DRIVER_NAME;
static int mtp_pid;
char guid_info[MAX_GUID_SIZE+1];
/* MTP Device Structure*/
struct mtpg_dev {
struct usb_function function;
#if IS_ENABLED(CONFIG_USB_CONFIGFS_UEVENT)
struct usb_function function_ptp;
#endif
struct usb_composite_dev *cdev;
struct usb_gadget *gadget;
spinlock_t lock;
u8 config;
int online;
int error;
int read_ready;
struct list_head tx_idle;
struct list_head rx_idle;
struct list_head rx_done;
struct list_head intr_idle;
wait_queue_head_t read_wq;
wait_queue_head_t write_wq;
wait_queue_head_t intr_wq;
struct usb_request *read_req;
unsigned char *read_buf;
unsigned read_count;
struct usb_ep *bulk_in;
struct usb_ep *bulk_out;
struct usb_ep *int_in;
struct usb_request *notify_req;
struct workqueue_struct *wq;
struct work_struct read_send_work;
struct file *read_send_file;
int64_t read_send_length;
uint16_t read_send_cmd;
uint32_t read_send_id;
int read_send_result;
atomic_t read_excl;
atomic_t write_excl;
atomic_t ioctl_excl;
atomic_t open_excl;
atomic_t wintfd_excl;
char cancel_io_buf[USB_PTPREQUEST_CANCELIO_SIZE+1];
int cancel_io;
};
/* Global mtpg_dev Structure
* the_mtpg variable be used between mtpg_open() and mtpg_function_bind() */
static struct mtpg_dev *the_mtpg;
/* Three full-speed and high-speed endpoint descriptors: bulk-in, bulk-out,
* and interrupt-in. */
struct usb_interface_descriptor mtpg_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
.bInterfaceProtocol = 0,
};
static struct usb_interface_descriptor ptp_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_STILL_IMAGE,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 1,
};
static struct usb_endpoint_descriptor mtpg_superspeed_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(1024),
};
static struct usb_endpoint_descriptor mtpg_superspeed_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(1024),
};
static struct usb_ss_ep_comp_descriptor mtpg_superspeed_bulk_comp_desc = {
.bLength = sizeof mtpg_superspeed_bulk_comp_desc,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 2 values can be tweaked if necessary */
.bMaxBurst = 4,
/* .bmAttributes = 0, */
};
static struct usb_endpoint_descriptor fs_mtpg_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* wMaxPacketSize set by autoconfiguration */
};
static struct usb_endpoint_descriptor fs_mtpg_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* wMaxPacketSize set by autoconfiguration */
};
static struct usb_endpoint_descriptor int_fs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = __constant_cpu_to_le16(MTPG_INTR_BUFFER_SIZE),
.bInterval = 6,
};
static struct usb_descriptor_header *fs_mtpg_desc[] = {
(struct usb_descriptor_header *) &mtpg_interface_desc,
(struct usb_descriptor_header *) &fs_mtpg_in_desc,
(struct usb_descriptor_header *) &fs_mtpg_out_desc,
(struct usb_descriptor_header *) &int_fs_notify_desc,
NULL,
};
static struct usb_endpoint_descriptor hs_mtpg_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
/*bEndpointAddress copied from fs_mtpg_in_desc
during mtpg_function_bind()*/
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_mtpg_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
/*bEndpointAddress copied from fs_mtpg_out_desc
during mtpg_function_bind()*/
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(512),
.bInterval = 1, /* NAK every 1 uframe */
};
static struct usb_endpoint_descriptor int_hs_notify_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = __constant_cpu_to_le16(MTPG_INTR_BUFFER_SIZE),
.bInterval = 6,
};
static struct usb_ss_ep_comp_descriptor ss_intr_notify_desc = {
.bLength = sizeof ss_intr_notify_desc,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
/* the following 3 values can be tweaked if necessary */
/* .bMaxBurst = 0, */
/* .bmAttributes = 0, */
.wBytesPerInterval = __constant_cpu_to_le16(MTPG_INTR_BUFFER_SIZE),
};
/* In VZW Models size of MTU is fixed using Devguru AVD Descriptor */
struct usb_mtp_avd_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u16 bDAU1_Type;
__u16 bDAU1_Length;
__u8 bDAU1_Value;
} __attribute__ ((packed));
static struct usb_mtp_avd_descriptor mtp_avd_descriptor = {
.bLength = 0x08,
.bDescriptorType = 0x24,
.bDescriptorSubType = 0x80,
/* First DAU = MTU Size */
.bDAU1_Type = 0x000C,
.bDAU1_Length = 0x0001,
.bDAU1_Value = 0x01,
};
static struct usb_descriptor_header *ss_mtpg_descs[] = {
(struct usb_descriptor_header *) &mtpg_interface_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_in_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_bulk_comp_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_out_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_bulk_comp_desc,
(struct usb_descriptor_header *) &int_hs_notify_desc,
(struct usb_descriptor_header *) &ss_intr_notify_desc,
(struct usb_descriptor_header *) &mtp_avd_descriptor,
NULL,
};
static struct usb_descriptor_header *hs_mtpg_desc[] = {
(struct usb_descriptor_header *) &mtpg_interface_desc,
(struct usb_descriptor_header *) &hs_mtpg_in_desc,
(struct usb_descriptor_header *) &hs_mtpg_out_desc,
(struct usb_descriptor_header *) &int_hs_notify_desc,
(struct usb_descriptor_header *) &mtp_avd_descriptor,
NULL
};
static struct usb_descriptor_header *ss_ptpg_descs[] = {
(struct usb_descriptor_header *) &ptp_interface_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_in_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_bulk_comp_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_out_desc,
(struct usb_descriptor_header *) &mtpg_superspeed_bulk_comp_desc,
(struct usb_descriptor_header *) &int_hs_notify_desc,
(struct usb_descriptor_header *) &ss_intr_notify_desc,
(struct usb_descriptor_header *) &mtp_avd_descriptor,
NULL,
};
static struct usb_descriptor_header *fs_ptp_descs[] = {
(struct usb_descriptor_header *) &ptp_interface_desc,
(struct usb_descriptor_header *) &fs_mtpg_in_desc,
(struct usb_descriptor_header *) &fs_mtpg_out_desc,
(struct usb_descriptor_header *) &int_fs_notify_desc,
(struct usb_descriptor_header *) &mtp_avd_descriptor,
NULL,
};
static struct usb_descriptor_header *hs_ptp_descs[] = {
(struct usb_descriptor_header *) &ptp_interface_desc,
(struct usb_descriptor_header *) &hs_mtpg_in_desc,
(struct usb_descriptor_header *) &hs_mtpg_out_desc,
(struct usb_descriptor_header *) &int_hs_notify_desc,
(struct usb_descriptor_header *) &mtp_avd_descriptor,
NULL,
};
/* string IDs are assigned dynamically */
#define F_MTP_IDX 0
#define STRING_PRODUCT_IDX 1
#define STRING_SERIAL_IDX 2
/* default serial number takes at least two packets */
static const char serial[] = "0123456789.0123456789.0123456789";
static struct usb_string strings_dev_mtp[] = {
[F_MTP_IDX].s = "MTP",
[STRING_PRODUCT_IDX].s = mtpg_longname,
[STRING_SERIAL_IDX].s = serial,
{ }, /* end of list */
};
static struct usb_gadget_strings stringtab_mtp = {
.language = 0x0409, /* en-us */
.strings = strings_dev_mtp,
};
static struct usb_gadget_strings *mtpg_dev_strings[] = {
&stringtab_mtp,
NULL,
};
/* Microsoft MTP OS String */
static u8 mtpg_os_string[] = {
18, /* sizeof(mtpg_os_string) */
USB_DT_STRING,
/* Signature field: "MSFT100" */
'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0,
/* vendor code */
1,
/* padding */
0
};
/* Microsoft Extended Configuration Descriptor Header Section */
struct mtpg_ext_config_desc_header {
__le32 dwLength;
__u16 bcdVersion;
__le16 wIndex;
__u8 bCount;
__u8 reserved[7];
};
/* Microsoft Extended Configuration Descriptor Function Section */
struct mtpg_ext_config_desc_function {
__u8 bFirstInterfaceNumber;
__u8 bInterfaceCount;
__u8 compatibleID[8];
__u8 subCompatibleID[8];
__u8 reserved[6];
};
/* MTP Extended Configuration Descriptor */
struct {
struct mtpg_ext_config_desc_header header;
struct mtpg_ext_config_desc_function function;
} mtpg_ext_config_desc = {
.header = {
.dwLength = __constant_cpu_to_le32
(sizeof(mtpg_ext_config_desc)),
.bcdVersion = __constant_cpu_to_le16(0x0100),
.wIndex = __constant_cpu_to_le16(4),
.bCount = __constant_cpu_to_le16(1),
},
.function = {
.bFirstInterfaceNumber = 0,
.bInterfaceCount = 1,
.compatibleID = { 'M', 'T', 'P' },
},
};
struct mtp_instance {
struct usb_function_instance func_inst;
const char *name;
struct mtpg_dev *dev;
char mtp_ext_compat_id[16];
struct usb_os_desc mtp_os_desc;
};
/* Function : Change config for multi configuration
* Parameter : int conf_num (config number)
* 0 - use mtp only without Samsung USB Driver
* 1 - use mtp + acm with Samsung USB Driver
* Description
* Below function is for samsung multi configuration
* feature made by soonyong,cho.
* Please add below handler to set_config_desc of function.
* Date : 2011-08-03
*/
static int mtp_set_config_desc(int conf_num)
{
switch (conf_num) {
case 0:
mtpg_interface_desc.bInterfaceClass =
USB_CLASS_VENDOR_SPEC;
mtpg_interface_desc.bInterfaceSubClass =
USB_SUBCLASS_VENDOR_SPEC;
mtpg_interface_desc.bInterfaceProtocol =
0x0;
break;
case 1:
mtpg_interface_desc.bInterfaceClass =
USB_CLASS_STILL_IMAGE;
mtpg_interface_desc.bInterfaceSubClass =
0x01;
mtpg_interface_desc.bInterfaceProtocol =
0x01;
break;
}
return 1;
}
/* -------------------------------------------------------------------------
* Main Functionalities Start!
* ------------------------------------------------------------------------- */
static inline struct mtpg_dev *mtpg_func_to_dev(struct usb_function *f)
{
#if IS_ENABLED(CONFIG_USB_CONFIGFS_UEVENT)
if (!strcmp(f->name, DRIVER_NAME_PTP))
return container_of(f, struct mtpg_dev, function_ptp);
#endif
return container_of(f, struct mtpg_dev, function);
}
static inline int _lock(atomic_t *excl)
{
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
if (atomic_inc_return(excl) == 1) {
return 0;
} else {
atomic_dec(excl);
return -1;
}
}
static inline void _unlock(atomic_t *excl)
{
atomic_dec(excl);
}
/* add a request to the tail of a list */
static void mtpg_req_put(struct mtpg_dev *dev, struct list_head *head,
struct usb_request *req)
{
unsigned long flags;
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
spin_lock_irqsave(&dev->lock, flags);
list_add_tail(&req->list, head);
spin_unlock_irqrestore(&dev->lock, flags);
}
static ssize_t guid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
printk(KERN_DEBUG "mtp: [%s]\tline = [%d]\n", __func__, __LINE__);
memcpy(buf, guid_info, MAX_GUID_SIZE);
return MAX_GUID_SIZE;
}
static ssize_t guid_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
int value;
printk(KERN_DEBUG "mtp: [%s]\tline = [%d]\n", __func__, __LINE__);
if (size > MAX_GUID_SIZE)
return -EINVAL;
value = strlcpy(guid_info, buf, size);
return value;
}
/* remove a request from the head of a list */
static struct usb_request *mtpg_req_get(struct mtpg_dev *dev,
struct list_head *head)
{
unsigned long flags;
struct usb_request *req;
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
spin_lock_irqsave(&dev->lock, flags);
if (list_empty(head)) {
req = 0;
} else {
req = list_first_entry(head, struct usb_request, list);
list_del(&req->list);
}
spin_unlock_irqrestore(&dev->lock, flags);
return req;
}
static int mtp_send_signal(int value)
{
int ret;
struct siginfo info;
struct task_struct *t;
memset(&info, 0, sizeof(struct siginfo));
info.si_signo = SIG_SETUP;
info.si_code = SI_QUEUE;
info.si_int = value;
rcu_read_lock();
if (!current->nsproxy) {
printk(KERN_DEBUG "process has gone\n");
rcu_read_unlock();
return -ENODEV;
}
t = pid_task(find_vpid(mtp_pid), PIDTYPE_PID);
if (t == NULL) {
printk(KERN_DEBUG "no such pid\n");
rcu_read_unlock();
return -ENODEV;
}
rcu_read_unlock();
/*send the signal*/
ret = send_sig_info(SIG_SETUP, &info, t);
if (ret < 0) {
printk(KERN_ERR "[%s]error sending signal\n", __func__);
return ret;
}
return 0;
}
static int mtpg_open(struct inode *ip, struct file *fp)
{
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
if (_lock(&the_mtpg->open_excl)) {
printk(KERN_ERR "mtpg_open fn mtpg device busy\n");
return -EBUSY;
}
fp->private_data = the_mtpg;
/* clear the error latch */
DEBUG_MTPB("[%s] mtpg_open and clearing the error = 0\n", __func__);
the_mtpg->error = 0;
return 0;
}
static ssize_t mtpg_read(struct file *fp, char __user *buf,
size_t count, loff_t *pos)
{
struct mtpg_dev *dev = fp->private_data;
struct usb_request *req;
int r = count, xfer;
int ret;
// DEBUG_MTPR("[%s] and count = (%d)\n", __func__, count);
if (_lock(&dev->read_excl))
return -EBUSY;
while (!((dev->online || dev->error) && dev->read_ready)) {
DEBUG_MTPR("[%s] and line is = %d\n", __func__, __LINE__);
ret = wait_event_interruptible(dev->read_wq,
((dev->online || dev->error) && dev->read_ready));
if (ret < 0) {
_unlock(&dev->read_excl);
printk(KERN_DEBUG "[%s]line is = %d,mtp_read ret<0\n",
__func__, __LINE__);
return ret;
}
}
while (count > 0) {
DEBUG_MTPR("[%s] and line is = %d\n", __func__, __LINE__);
if (dev->error) {
r = -EIO;
printk(KERN_ERR "[%s]\t%d:dev->error so break r=%d\n",
__func__, __LINE__, r);
break;
}
/* if we have idle read requests, get them queued */
DEBUG_MTPR("[%s]\t%d: get request\n", __func__, __LINE__);
while ((req = mtpg_req_get(dev, &dev->rx_idle))) {
requeue_req:
req->length = MTPG_BULK_BUFFER_SIZE;
DEBUG_MTPR("[%s]\t%d:usb-ep-queue\n",
__func__, __LINE__);
ret = usb_ep_queue(dev->bulk_out, req, GFP_ATOMIC);
DEBUG_MTPR("[%s]\t%d:Endpoint: %s\n",
__func__, __LINE__, dev->bulk_out->name);
if (ret < 0) {
r = -EIO;
dev->error = 1;
mtpg_req_put(dev, &dev->rx_idle, req);
printk(KERN_ERR "[%s]line[%d]FAIL r=%d\n",
__func__, __LINE__, r);
goto fail;
} else {
DEBUG_MTPR("[%s]rx req queue%p\n",
__func__, req);
}
}
DEBUG_MTPR("[%s]\t%d:read_count = %d\n",
__func__, __LINE__, dev->read_count);
/* if we have data pending, give it to userspace */
if (dev->read_count > 0) {
DEBUG_MTPR("[%s]\t%d: read_count = %d\n",
__func__, __LINE__, dev->read_count);
if (dev->read_count < count)
xfer = dev->read_count;
else
xfer = count;
DEBUG_MTPR("[%s]copy_to_user 0x%x bytes on EP %p\n",
__func__, dev->read_count, dev->bulk_out);
if (copy_to_user(buf, dev->read_buf, xfer)) {
r = -EFAULT;
printk(KERN_ERR "[%s]%d:cpytouer fail r=%d\n",
__func__, __LINE__, r);
break;
}
dev->read_buf += xfer;
dev->read_count -= xfer;
buf += xfer;
count -= xfer;
/* if we've emptied the buffer, release the request */
if (dev->read_count == 0) {
DEBUG_MTPR("[%s] and line is = %d\n",
__func__, __LINE__);
mtpg_req_put(dev, &dev->rx_idle, dev->read_req);
dev->read_req = 0;
}
/*Updating the buffer size and returnung
from mtpg_read */
r = xfer;
DEBUG_MTPR("[%s] \t %d: returning lenght %d\n",
__func__, __LINE__, r);
goto fail;
}
/* wait for a request to complete */
req = 0;
DEBUG_MTPR("[%s] and line is = %d\n", __func__, __LINE__);
ret = wait_event_interruptible(dev->read_wq,
((req = mtpg_req_get(dev, &dev->rx_done))
|| dev->error));
DEBUG_MTPR("[%s]\t%d: dev->error %d and req = %p\n",
__func__, __LINE__, dev->error, req);
if (req != 0) {
/* if we got a 0-len one we need to put it back into
** service. if we made it the current read req we'd
** be stuck forever
*/
if (req->actual == 0)
goto requeue_req;
dev->read_req = req;
dev->read_count = req->actual;
dev->read_buf = req->buf;
DEBUG_MTPR("[%s]\t%d: rx_req=%p req->actual=%d\n",
__func__, __LINE__, req, req->actual);
}
if (ret < 0) {
r = ret;
printk(KERN_DEBUG "[%s]\t%d after ret=%d brk ret=%d\n",
__func__, __LINE__, ret, r);
break;
}
}
fail:
_unlock(&dev->read_excl);
DEBUG_MTPR("[%s]\t%d: RETURNING Back to USpace r=%d\n",
__func__, __LINE__, r);
return r;
}
static ssize_t mtpg_write(struct file *fp, const char __user *buf,
size_t count, loff_t *pos)
{
struct mtpg_dev *dev = fp->private_data;
struct usb_request *req = 0;
int r = count, xfer;
int ret;
DEBUG_MTPW("[%s] \t%d ep bulk_out name = %s\n",
__func__, __LINE__, dev->bulk_out->name);
if (_lock(&dev->write_excl))
return -EBUSY;
while (count > 0) {
if (dev->error) {
r = -EIO;
printk(KERN_DEBUG "[%s]%d count>0 dev->error so brk\n",
__func__, __LINE__);
break;
}
/* get an idle tx request to use */
req = 0;
ret = wait_event_interruptible(dev->write_wq,
((req = mtpg_req_get(dev, &dev->tx_idle))
|| dev->error));
if (ret < 0) {
r = ret;
printk(KERN_DEBUG "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
break;
}
if (req != 0) {
if (count > MTPG_BULK_BUFFER_SIZE)
xfer = MTPG_BULK_BUFFER_SIZE;
else
xfer = count;
DEBUG_MTPW("[%s]\t%d copy_from_user length %d\n",
__func__, __LINE__, xfer);
if (copy_from_user(req->buf, buf, xfer)) {
printk(KERN_ERR "mtpwrite cpyfrmusr error\n");
r = -EFAULT;
break;
}
req->length = xfer;
ret = usb_ep_queue(dev->bulk_in, req, GFP_ATOMIC);
if (ret < 0) {
dev->error = 1;
r = -EIO;
printk(KERN_ERR "[%s]\t%d ep_que ret=%d brk ret=%d\n",
__func__, __LINE__, ret, r);
break;
}
buf += xfer;
count -= xfer;
/* zero this so we don't try to free it on error exit */
req = 0;
}
}
if (req) {
DEBUG_MTPW("[%s] \t%d mtpg_req_put\n", __func__, __LINE__);
mtpg_req_put(dev, &dev->tx_idle, req);
}
_unlock(&dev->write_excl);
DEBUG_MTPW("[%s]\t%d RETURN back to USpace r=%d\n",
__func__, __LINE__, r);
return r;
}
/*
static void interrupt_complete(struct usb_ep *ep, struct usb_request *req)
{
printk(KERN_DEBUG "Finished Writing Interrupt Data\n");
}
*/
#ifdef CONFIG_COMPAT
static ssize_t interrupt_write_config_compat(struct file *fd,
const char __user *buf, size_t count)
{
struct mtpg_dev *dev = fd->private_data;
struct usb_request *req = 0;
int ret;
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
if (count > MTPG_INTR_BUFFER_SIZE)
return -EINVAL;
ret = wait_event_interruptible_timeout(dev->intr_wq,
(req = mtpg_req_get(dev, &dev->intr_idle)),
msecs_to_jiffies(1000));
if (!req) {
printk(KERN_ERR "[%s]Alloc has failed\n", __func__);
return -ENOMEM;
}
if (copy_from_user(req->buf, buf, count)) {
mtpg_req_put(dev, &dev->intr_idle, req);
printk(KERN_ERR "[%s]copy from user has failed\n", __func__);
return -EIO;
}
req->length = count;
/*req->complete = interrupt_complete;*/
ret = usb_ep_queue(dev->int_in, req, GFP_ATOMIC);
if (ret) {
printk(KERN_ERR "[%s:%d]\n", __func__, __LINE__);
mtpg_req_put(dev, &dev->intr_idle, req);
}
DEBUG_MTPB("[%s] \tline = [%d] returning ret is %d\\n",
__func__, __LINE__, ret);
return ret;
}
#endif
static ssize_t interrupt_write(struct file *fd,
struct mtp_event *event, size_t count)
{
struct mtpg_dev *dev = fd->private_data;
struct usb_request *req = 0;
int ret;
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
if (count > MTPG_INTR_BUFFER_SIZE)
return -EINVAL;
ret = wait_event_interruptible_timeout(dev->intr_wq,
(req = mtpg_req_get(dev, &dev->intr_idle)),
msecs_to_jiffies(1000));
if (!req) {
printk(KERN_ERR "[%s]Alloc has failed\n", __func__);
return -ENOMEM;
}
if (copy_from_user(req->buf, (void __user *)event->data, count)) {
mtpg_req_put(dev, &dev->intr_idle, req);
printk(KERN_ERR "[%s]copy from user has failed\n", __func__);
return -EIO;
}
req->length = (unsigned)count;
/*req->complete = interrupt_complete;*/
ret = usb_ep_queue(dev->int_in, req, GFP_KERNEL);
if (ret) {
printk(KERN_ERR "[%s:%d]\n", __func__, __LINE__);
mtpg_req_put(dev, &dev->intr_idle, req);
}
DEBUG_MTPB("[%s] \tline = [%d] returning ret is %d\\n",
__func__, __LINE__, ret);
return ret;
}
static void mtp_complete_ep0_transection(struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length) {
DEBUG_MTPB("[%s]\tline = [%d]\n", __func__, __LINE__);
}
}
static void read_send_work(struct work_struct *work)
{
struct mtpg_dev *dev = container_of(work, struct mtpg_dev,
read_send_work);
//struct usb_composite_dev *cdev = dev->cdev;
struct usb_request *req = 0;
struct usb_container_header *hdr;
struct file *file;
loff_t file_pos = 0;
int64_t count = 0;
int xfer = 0;
int ret = -1;
int64_t hdr_length = 0;
int r = 0;
int ZLP_flag = 0;
/* read our parameters */
smp_rmb();
file = dev->read_send_file;
count = dev->read_send_length;
hdr_length = sizeof(struct usb_container_header);
count += hdr_length;
printk(KERN_DEBUG "[%s:%d] offset=[%lld]\t leth+hder=[%lld]\n",
__func__, __LINE__, file_pos, count);
if (count < 0) {
r = -EIO;
printk(KERN_ERR "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
}
/* Zero Length Packet should be sent if the last trasfer
* size is equals to the max packet size.
*/
if ((count & (dev->bulk_in->maxpacket - 1)) == 0)
ZLP_flag = 1;
while (count > 0 || ZLP_flag) {
/*Breaking the loop after sending Zero Length Packet*/
if (count == 0)
ZLP_flag = 0;
if (dev->cancel_io == 1) {
dev->cancel_io = 0; /*reported to user space*/
r = -EIO;
printk(KERN_DEBUG "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
break;
}
/* get an idle tx request to use */
req = 0;
ret = wait_event_interruptible(dev->write_wq,
((req = mtpg_req_get(dev, &dev->tx_idle))
|| dev->error));
if (ret < 0 || !req) {
r = ret;
printk(KERN_DEBUG "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
break;
}
if (count > MTPG_BULK_BUFFER_SIZE)
xfer = MTPG_BULK_BUFFER_SIZE;
else
xfer = count;
if (hdr_length) {
hdr = (struct usb_container_header *)req->buf;
hdr->Length = __cpu_to_le32(count);
hdr->Type = __cpu_to_le16(2);
hdr->Code = __cpu_to_le16(dev->read_send_cmd);
hdr->TransactionID = __cpu_to_le32(dev->read_send_id);
}
#ifdef CONFIG_MEDIATEK_SOLUTION
usb_boost();
#endif
ret = vfs_read(file, req->buf + hdr_length,
xfer - hdr_length, &file_pos);
if (ret < 0 || !req) {
r = ret;
printk(KERN_DEBUG "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
break;
}
xfer = ret + hdr_length;
hdr_length = 0;
req->length = xfer;
ret = usb_ep_queue(dev->bulk_in, req, GFP_KERNEL);
if (ret < 0 || !req) {
dev->error = 1;
r = -EIO;
printk(KERN_DEBUG "[%s]\t%d ret = %d\n",
__func__, __LINE__, r);
break;
}
count -= xfer;
req = 0;
}
if (req)
mtpg_req_put(dev, &dev->tx_idle, req);
DEBUG_MTPB("[%s] \tline = [%d] \t r = [%d]\n", __func__, __LINE__, r);
dev->read_send_result = r;
smp_wmb();
}
static long mtpg_ioctl(struct file *fd, unsigned int code, unsigned long arg)
{
struct mtpg_dev *dev = fd->private_data;
struct mtp_event event;
struct usb_composite_dev *cdev;
struct usb_request *req;
int status = 0;
int size = 0;
int ret_value = 0;
int max_pkt = 0;
char *buf_ptr = NULL;
char buf[USB_PTPREQUEST_GETSTATUS_SIZE+1] = {0};
cdev = dev->cdev;
if (!cdev) {
printk(KERN_ERR "usb: %s cdev not ready\n", __func__);
return -EAGAIN;
}
req = cdev->req;
if (!cdev->req) {
printk(KERN_ERR "usb: %s cdev->req not ready\n", __func__);
return -EAGAIN;
}
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
switch (code) {
case MTP_ONLY_ENABLE:
printk(KERN_DEBUG "[%s:%d] MTP_ONLY_ENABLE ioctl:\n",
__func__, __LINE__);
if (dev->cdev && dev->cdev->gadget) {
usb_gadget_disconnect(cdev->gadget);
printk(KERN_DEBUG "[%s:%d] B4 disconectng gadget\n",
__func__, __LINE__);
msleep(400);
usb_gadget_connect(cdev->gadget);
printk(KERN_DEBUG "[%s:%d] after usb_gadget_connect\n",
__func__, __LINE__);
}
status = 10;
printk(KERN_DEBUG "[%s:%d] MTP_ONLY_ENABLE clearing error 0\n",
__func__, __LINE__);
the_mtpg->error = 0;
break;
case MTP_DISABLE:
/*mtp_function_enable(mtp_disable_desc);*/
if (dev->cdev && dev->cdev->gadget) {
usb_gadget_disconnect(dev->cdev->gadget);
mdelay(5);
usb_gadget_connect(dev->cdev->gadget);
}
break;
case MTP_CLEAR_HALT:
status = usb_ep_clear_halt(dev->bulk_in);
status = usb_ep_clear_halt(dev->bulk_out);
break;
case MTP_WRITE_INT_DATA:
printk(KERN_INFO "[%s]\t%d MTP intrpt_Write no slep\n",
__func__, __LINE__);
if (copy_from_user(&event, (void __user *)arg, sizeof(event))){
status = -EFAULT;
printk(KERN_ERR "[%s]\t%d:copyfrmuser fail\n",
__func__, __LINE__);
break;
}
printk(KERN_INFO "[%s]\t%d event length : %zu\n", __func__, __LINE__, event.length);
if( event.length == MTP_MAX_PACKET_LEN_FROM_APP){
ret_value = interrupt_write(fd, &event, MTP_MAX_PACKET_LEN_FROM_APP);
if (ret_value < 0) {
printk(KERN_ERR "[%s]\t%d interptFD failed : %d\n",
__func__, __LINE__, ret_value);
status = -EIO;
} else {
printk(KERN_DEBUG "[%s]\t%d intruptFD suces\n",
__func__, __LINE__);
status = MTP_MAX_PACKET_LEN_FROM_APP;
}
}
else{
#ifdef CONFIG_COMPAT
ret_value = interrupt_write_config_compat(fd, (const char *)arg , MTP_MAX_PACKET_LEN_FROM_APP);
if (ret_value < 0) {
printk(KERN_ERR "[%s]\t%d MTP_WRITE_INT_DATA_CONFIG_COMPAT interptFD failed\n",
__func__, __LINE__);
status = -EIO;
} else {
printk(KERN_DEBUG "[%s]\t%d MTP_WRITE_INT_DATA_CONFIG_COMPAT intruptFD suces\n",
__func__, __LINE__);
status = MTP_MAX_PACKET_LEN_FROM_APP;
}
#else
status = -EIO;
#endif
}
break;
case SET_MTP_USER_PID:
mtp_pid = arg;
printk(KERN_DEBUG "[%s]SET_MTP_USER_PID;pid=%d\tline=[%d]\n",
__func__, mtp_pid, __LINE__);
break;
case GET_SETUP_DATA:
buf_ptr = (char *)arg;
printk(KERN_DEBUG "[%s] GET_SETUP_DATA\tline = [%d]\n",
__func__, __LINE__);
if (copy_to_user(buf_ptr, dev->cancel_io_buf,
USB_PTPREQUEST_CANCELIO_SIZE)) {
status = -EIO;
printk(KERN_ERR "[%s]\t%d:coptousr failed\n",
__func__, __LINE__);
}
break;
case SEND_RESET_ACK:
/*req->zero = 1;*/
req->length = 0;
/*printk(KERN_DEBUG "[%s]SEND_RESET_ACK and usb_ep_queu
ZERO data size = %d\tline=[%d]\n",
__func__, size, __LINE__);*/
req->complete = mtp_complete_ep0_transection;
status = usb_ep_queue(cdev->gadget->ep0,
req, GFP_ATOMIC);
if (status < 0)
printk(KERN_ERR "[%s]ep_queue line = [%d]\n",
__func__, __LINE__);
break;
case SET_SETUP_DATA:
buf_ptr = (char *)arg;
if (copy_from_user(buf, buf_ptr,
USB_PTPREQUEST_GETSTATUS_SIZE)) {
status = -EIO;
printk(KERN_ERR "[%s]\t%d:copyfrmuser fail\n",
__func__, __LINE__);
break;
}
size = buf[0];
printk(KERN_DEBUG "[%s]SET_SETUP_DATA size=%d line=[%d]\n",
__func__, size, __LINE__);
if (size < 0) {
status = -EIO;
printk(KERN_ERR "[%s]\t%d:size is negative\n",
__func__, __LINE__);
break;
}
if (size > USB_PTPREQUEST_GETSTATUS_SIZE) {
size = USB_PTPREQUEST_GETSTATUS_SIZE;
}
memcpy(req->buf, buf, size);
req->zero = 0;
req->length = size;
req->complete = mtp_complete_ep0_transection;
status = usb_ep_queue(cdev->gadget->ep0, req,
GFP_ATOMIC);
if (status < 0)
printk(KERN_ERR "[%s]usbepqueue line=[%d]\n",
__func__, __LINE__);
break;
case SET_ZLP_DATA:
/*req->zero = 1;*/
req = mtpg_req_get(dev, &dev->tx_idle);
if (!req) {
printk(KERN_DEBUG "[%s] Failed to get ZLP_DATA\n",
__func__);
return -EAGAIN;
}
req->length = 0;
printk(KERN_DEBUG "[%s]ZLP_DATA data=%d\tline=[%d]\n",
__func__, size, __LINE__);
status = usb_ep_queue(dev->bulk_in, req, GFP_ATOMIC);
if (status < 0) {
printk(KERN_ERR "[%s]usbepqueue line=[%d]\n",
__func__, __LINE__);
} else {
printk(KERN_DEBUG "%sZLPstatus=%d\tline=%d\n",
__func__, __LINE__, status);
status = 20;
}
break;
case GET_HIGH_FULL_SPEED:
printk(KERN_DEBUG "[%s]GET_HIGH_FULLSPEED line=[%d]\n",
__func__, __LINE__);
max_pkt = dev->bulk_in->maxpacket;
printk(KERN_DEBUG "[%s] line = %d max_pkt = [%d]\n",
__func__, __LINE__, max_pkt);
status = max_pkt;
break;
case SEND_FILE_WITH_HEADER:
{
struct read_send_info info;
struct work_struct *work;
struct file *file = NULL;
if (_lock(&dev->ioctl_excl)){
status = -EBUSY;
goto exit;
}
printk(KERN_DEBUG "[%s]SEND_FILE_WITH_HEADER line=[%d]\n",
__func__, __LINE__);
if (copy_from_user(&info, (void __user *)arg, sizeof(info))) {
status = -EFAULT;
_unlock(&dev->ioctl_excl);
goto exit;
}
file = fget(info.Fd);
if (!file) {
status = -EBADF;
_unlock(&dev->ioctl_excl);
printk(KERN_DEBUG "[%s] line=[%d] bad file number\n",
__func__, __LINE__);
goto exit;
}
dev->read_send_file = file;
dev->read_send_length = info.Length;
smp_wmb();
work = &dev->read_send_work;
dev->read_send_cmd = info.Code;
dev->read_send_id = info.TransactionID;
queue_work(dev->wq, work);
/* Wait for the work to be complted on work queue */
flush_workqueue(dev->wq);
fput(file);
smp_rmb();
status = dev->read_send_result;
_unlock(&dev->ioctl_excl);
break;
}
case MTP_VBUS_DISABLE:
printk(KERN_DEBUG "[%s] line=[%d] \n",
__func__, __LINE__);
if (dev->cdev && dev->cdev->gadget) {
usb_gadget_vbus_disconnect(cdev->gadget);
printk(KERN_DEBUG "Restricted policy so disconnecting mtp gadget\n");
}
break;
default:
status = -ENOTTY;
}
exit:
return status;
}
#ifdef CONFIG_COMPAT //2014.11.12 for 64bit kernel & 32bit platform
static long mtpg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret;
ret = mtpg_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
return ret;
}
#endif
static int mtpg_release_device(struct inode *ip, struct file *fp)
{
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
if (the_mtpg != NULL)
_unlock(&the_mtpg->open_excl);
return 0;
}
/* file operations for MTP device /dev/usb_mtp_gadget */
static const struct file_operations mtpg_fops = {
.owner = THIS_MODULE,
.read = mtpg_read,
.write = mtpg_write,
.open = mtpg_open,
.unlocked_ioctl = mtpg_ioctl,
.release = mtpg_release_device,
#ifdef CONFIG_COMPAT
.compat_ioctl = mtpg_compat_ioctl,
#endif
};
static struct miscdevice mtpg_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = shortname,
.fops = &mtpg_fops,
};
struct usb_request *mtp_alloc_ep_req(struct usb_ep *ep,
unsigned len, gfp_t kmalloc_flags)
{
struct usb_request *req;
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req) {
req->length = len;
req->buf = kmalloc(len, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request(ep, req);
req = NULL;
}
}
return req;
}
static void mtpg_request_free(struct usb_request *req, struct usb_ep *ep)
{
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
if (req) {
kfree(req->buf);
usb_ep_free_request(ep, req);
}
}
static struct usb_request *mtpg_request_new(struct usb_ep *ep, int buffer_size)
{
struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
DEBUG_MTPB("[%s] \tline = [%d]\n", __func__, __LINE__);
if (!req) {
printk(KERN_ERR "[%s]\tline %d ERROR\n", __func__, __LINE__);
return NULL;
}
/* now allocate buffers for the requests */
#if defined(CONFIG_64BIT) && defined(CONFIG_MTK_LM_MODE)
req->buf = kmalloc(buffer_size, GFP_KERNEL | GFP_DMA);
#else
req->buf = kmalloc(buffer_size, GFP_KERNEL);
#endif
if (!req->buf) {
usb_ep_free_request(ep, req);
return NULL;
}
return req;
}
static void mtpg_complete_in(struct usb_ep *ep, struct usb_request *req)
{
struct mtpg_dev *dev = the_mtpg;
DEBUG_MTPB("[%s]\t %d req->status is = %d\n",
__func__, __LINE__, req->status);
if (req->status != 0)
dev->error = 1;
mtpg_req_put(dev, &dev->tx_idle, req);
wake_up(&dev->write_wq);
}
#ifdef CONFIG_MEDIATEK_SOLUTION
static bool mtp_rx_boost = true;
module_param(mtp_rx_boost, bool, 0644);
#endif
static void mtpg_complete_out(struct usb_ep *ep, struct usb_request *req)
{
struct mtpg_dev *dev = the_mtpg;
DEBUG_MTPB("[%s]\tline = [%d]req->status is = %d\n",
__func__, __LINE__, req->status);
if (req->status != 0) {
dev->error = 1;
DEBUG_MTPB("[%s]\t%d dev->error is=%d for rx_idle\n",
__func__, __LINE__, dev->error);
mtpg_req_put(dev, &dev->rx_idle, req);
} else {
DEBUG_MTPB("[%s]\t%d for rx_done\n", __func__, __LINE__);
mtpg_req_put(dev, &dev->rx_done, req);
}
#ifdef CONFIG_MEDIATEK_SOLUTION
if (mtp_rx_boost)
usb_boost();
#endif
wake_up(&dev->read_wq);
}
static void mtpg_complete_intr(struct usb_ep *ep, struct usb_request *req)
{
struct mtpg_dev *dev = the_mtpg;
/*printk(KERN_INFO "[%s]\tline = [%d]\n", __func__, __LINE__);*/
if (req->status != 0)
dev->error = 1;
mtpg_req_put(dev, &dev->intr_idle, req);
wake_up(&dev->intr_wq);
}
static DEVICE_ATTR(guid, S_IRUGO | S_IWUSR,
guid_show, guid_store);
static void
mtpg_function_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct mtpg_dev *dev = mtpg_func_to_dev(f);
struct usb_request *req;
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
strings_dev_mtp[F_MTP_IDX].id = 0;
while ((req = mtpg_req_get(dev, &dev->rx_idle)))
mtpg_request_free(req, dev->bulk_out);
while ((req = mtpg_req_get(dev, &dev->tx_idle)))
mtpg_request_free(req, dev->bulk_in);
while ((req = mtpg_req_get(dev, &dev->intr_idle)))
mtpg_request_free(req, dev->int_in);
memset(guid_info, 0, sizeof (guid_info));
//printk(KERN_DEBUG "mtp: %s guid after reset = %s\n", __func__, guid_info);
}
static int
mtpg_function_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct mtpg_dev *mtpg = mtpg_func_to_dev(f);
struct usb_request *req;
struct usb_ep *ep;
int i, id;
int status = 0;
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
id = usb_interface_id(c, f);
if (id < 0) {
printk(KERN_ERR "[%s]Error in usb_interface_id\n", __func__);
return id;
}
mtpg_interface_desc.bInterfaceNumber = id;
if (strings_dev_mtp[F_MTP_IDX].id == 0) {
status = usb_string_id(c->cdev);
if (status < 0)
return status;
strings_dev_mtp[F_MTP_IDX].id = status;
mtpg_interface_desc.iInterface = status;
}
ep = usb_ep_autoconfig(cdev->gadget, &fs_mtpg_in_desc);
if (!ep) {
printk(KERN_ERR "[%s]Error usb_ep_autoconfig IN\n", __func__);
goto autoconf_fail;
}
ep->driver_data = mtpg; /* claim the endpoint */
mtpg->bulk_in = ep;
the_mtpg->bulk_in = ep;
ep = usb_ep_autoconfig(cdev->gadget, &fs_mtpg_out_desc);
if (!ep) {
printk(KERN_ERR "[%s]Eror usb_ep_autoconfig OUT\n", __func__);
goto autoconf_fail;
}
ep->driver_data = mtpg; /* claim the endpoint */
mtpg->bulk_out = ep;
the_mtpg->bulk_out = ep;
/* Interrupt Support for MTP */
ep = usb_ep_autoconfig(cdev->gadget, &int_fs_notify_desc);
if (!ep) {
printk(KERN_ERR "[%s]Eror usb_ep_autoconfig INT\n", __func__);
goto autoconf_fail;
}
ep->driver_data = mtpg;
mtpg->int_in = ep;
the_mtpg->int_in = ep;
for (i = 0; i < MTPG_INTR_REQ_MAX; i++) {
req = mtpg_request_new(mtpg->int_in, MTPG_INTR_BUFFER_SIZE);
if (!req)
goto out;
req->complete = mtpg_complete_intr;
mtpg_req_put(mtpg, &mtpg->intr_idle, req);
}
for (i = 0; i < MTPG_RX_REQ_MAX; i++) {
req = mtpg_request_new(mtpg->bulk_out, MTPG_BULK_BUFFER_SIZE);
if (!req)
goto out;
req->complete = mtpg_complete_out;
mtpg_req_put(mtpg, &mtpg->rx_idle, req);
}
for (i = 0; i < MTPG_MTPG_TX_REQ_MAX; i++) {
req = mtpg_request_new(mtpg->bulk_in, MTPG_BULK_BUFFER_SIZE);
if (!req)
goto out;
req->complete = mtpg_complete_in;
mtpg_req_put(mtpg, &mtpg->tx_idle, req);
}
if (gadget_is_dualspeed(cdev->gadget)) {
DEBUG_MTPB("[%s]\tdual speed line = [%d]\n",
__func__, __LINE__);
/* Assume endpoint addresses are the same for both speeds */
hs_mtpg_in_desc.bEndpointAddress =
fs_mtpg_in_desc.bEndpointAddress;
hs_mtpg_out_desc.bEndpointAddress =
fs_mtpg_out_desc.bEndpointAddress;
int_hs_notify_desc.bEndpointAddress =
int_fs_notify_desc.bEndpointAddress;
}
if (gadget_is_superspeed(c->cdev->gadget)) {
DEBUG_MTPB("[%s]\tdual speed line = [%d]\n",
__func__, __LINE__);
mtpg_superspeed_in_desc.bEndpointAddress =
fs_mtpg_in_desc.bEndpointAddress;
mtpg_superspeed_out_desc.bEndpointAddress =
fs_mtpg_out_desc.bEndpointAddress;
}
printk("%s speed %s: IN/%s, OUT/%s\n",
gadget_is_superspeed(c->cdev->gadget) ? "super" :
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
f->name, mtpg->bulk_in->name, mtpg->bulk_out->name);
mtpg->cdev = cdev;
the_mtpg->cdev = cdev;
return 0;
autoconf_fail:
printk(KERN_ERR "mtpg unable to autoconfigure all endpoints\n");
return -ENOTSUPP;
out:
mtpg_function_unbind(c, f);
return -1;
}
static int mtpg_function_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct mtpg_dev *dev = mtpg_func_to_dev(f);
struct usb_composite_dev *cdev = f->config->cdev;
int ret;
if (dev->int_in->driver_data)
usb_ep_disable(dev->int_in);
ret = config_ep_by_speed(cdev->gadget, f, dev->int_in);
if (ret) {
dev->int_in->desc = NULL;
ERROR(cdev, "config_ep_by_speed failes for ep %s, result %d\n",
dev->int_in->name, ret);
return ret;
}
ret = usb_ep_enable(dev->int_in);
if (ret) {
ERROR(cdev, "failed to enable ep %s, result %d\n",
dev->int_in->name, ret);
return ret;
}
dev->int_in->driver_data = dev;
if (dev->bulk_in->driver_data)
usb_ep_disable(dev->bulk_in);
ret = config_ep_by_speed(cdev->gadget, f, dev->bulk_in);
if (ret) {
dev->bulk_in->desc = NULL;
ERROR(cdev, "config_ep_by_speed failes for ep %s, result %d\n",
dev->bulk_in->name, ret);
return ret;
}
ret = usb_ep_enable(dev->bulk_in);
if (ret) {
ERROR(cdev, "failed to enable ep %s, result %d\n",
dev->bulk_in->name, ret);
return ret;
}
dev->bulk_in->driver_data = dev;
if (dev->bulk_out->driver_data)
usb_ep_disable(dev->bulk_out);
ret = config_ep_by_speed(cdev->gadget, f, dev->bulk_out);
if (ret) {
dev->bulk_out->desc = NULL;
ERROR(cdev, "config_ep_by_speed failes for ep %s, result %d\n",
dev->bulk_out->name, ret);
return ret;
}
ret = usb_ep_enable(dev->bulk_out);
if (ret) {
ERROR(cdev, "failed to enable ep %s, result %d\n",
dev->bulk_out->name, ret);
return ret;
}
dev->bulk_out->driver_data = dev;
dev->online = 1;
dev->error = 0;
dev->read_ready = 1;
dev->cancel_io = 0;
/* readers may be blocked waiting for us to go online */
wake_up(&dev->read_wq);
return 0;
}
static void mtpg_function_disable(struct usb_function *f)
{
struct mtpg_dev *dev = mtpg_func_to_dev(f);
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
memset(guid_info, 0, sizeof (guid_info));
//printk(KERN_DEBUG "mtp: %s guid after reset = %s\n", __func__, guid_info);
dev->online = 0;
dev->error = 1;
usb_ep_disable(dev->int_in);
dev->int_in->driver_data = NULL;
usb_ep_disable(dev->bulk_in);
dev->bulk_in->driver_data = NULL;
usb_ep_disable(dev->bulk_out);
dev->bulk_out->driver_data = NULL;
wake_up(&dev->read_wq);
}
/*PIMA15740-2000 spec: Class specific setup request for MTP*/
static void
mtp_complete_cancel_io(struct usb_ep *ep, struct usb_request *req)
{
int i;
struct mtpg_dev *dev = ep->driver_data;
DEBUG_MTPB("[%s]\tline = [%d]\n", __func__, __LINE__);
if (req->status != 0) {
DEBUG_MTPB("[%s]req->status !=0\tline = [%d]\n",
__func__, __LINE__);
return;
}
if (req->actual != USB_PTPREQUEST_CANCELIO_SIZE) {
DEBUG_MTPB("[%s]USB_PTPREQUEST_CANCELIO_SIZE line = [%d]\n",
__func__, __LINE__);
usb_ep_set_halt(ep);
} else {
memset(dev->cancel_io_buf, 0, USB_PTPREQUEST_CANCELIO_SIZE+1);
memcpy(dev->cancel_io_buf, req->buf,
USB_PTPREQUEST_CANCELIO_SIZE);
dev->cancel_io = 1;
/*Debugging*/
for (i = 0; i < USB_PTPREQUEST_CANCELIO_SIZE; i++)
DEBUG_MTPB("[%s]cancel_io_buf[%d]=%x\tline = [%d]\n",
__func__, i, dev->cancel_io_buf[i], __LINE__);
mtp_send_signal(USB_PTPREQUEST_CANCELIO);
}
}
static void
mtp_complete_get_guid(struct usb_ep *ep, struct usb_request *req)
{
int size;
printk(KERN_DEBUG "[%s]\tline = [%d]\n", __func__, __LINE__);
DEBUG_MTPB("[%s]\tline = [%d]\n", __func__, __LINE__);
if (req->status != 0) {
DEBUG_MTPB("[%s]req->status !=0\tline = [%d]\n",
__func__, __LINE__);
return;
}
if (req->actual >= sizeof(guid_info)) {
size = sizeof(guid_info)-1;
} else
size = req->actual;
//printk(KERN_DEBUG "mtp: %s guid = %s\n", __func__, guid_info);
memset(guid_info, 0, sizeof(guid_info));
//printk(KERN_DEBUG "mtp: %s guid after reset = %s\n", __func__, guid_info);
memcpy(guid_info, req->buf, size);
}
static int mtp_ctrlrequest(struct usb_composite_dev *cdev,
const struct usb_ctrlrequest *ctrl)
{
struct mtpg_dev *dev = the_mtpg;
struct usb_request *req = cdev->req;
int signal_request = 0;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
if (ctrl->bRequestType ==
(USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE)
&& ctrl->bRequest == USB_REQ_GET_DESCRIPTOR
&& (w_value >> 8) == USB_DT_STRING
&& (w_value & 0xFF) == MTPG_OS_STRING_ID) {
value = (w_length < sizeof(mtpg_os_string)
? w_length : sizeof(mtpg_os_string));
memcpy(cdev->req->buf, mtpg_os_string, value);
if (value >= 0) {
int rc;
cdev->req->zero = value < w_length;
cdev->req->length = value;
rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
if (rc < 0)
printk(KERN_DEBUG "[%s:%d] setup queue error\n",
__func__, __LINE__);
}
return value;
} else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
if ((ctrl->bRequest == 1 || ctrl->bRequest == 0x54 ||
ctrl->bRequest == 0x6F || ctrl->bRequest == 0xFE)
&& (ctrl->bRequestType & USB_DIR_IN)
&& (w_index == 4 || w_index == 5)) {
value = (w_length < sizeof(mtpg_ext_config_desc) ?
w_length : sizeof(mtpg_ext_config_desc));
memcpy(cdev->req->buf, &mtpg_ext_config_desc, value);
if (value >= 0) {
int rc;
cdev->req->zero = value < w_length;
cdev->req->length = value;
rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
if (rc < 0)
printk(KERN_DEBUG "[%s:%d] setup queue error\n",
__func__, __LINE__);
}
return value;
} else if ((ctrl->bRequest == 0xA3) && (!(ctrl->bRequestType & USB_DIR_IN))) {
printk("mtp: [%s] RECEIVE PC GUID / line[%d]\n",
__func__, __LINE__);
value = w_length;
cdev->gadget->ep0->driver_data = dev;
req->complete = mtp_complete_get_guid;
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0,
req, GFP_ATOMIC);
if (value < 0) {
printk(KERN_ERR "[%s:%d]Error usb_ep_queue\n",
__func__, __LINE__);
} else
DEBUG_MTPB("[%s] ep-queue-sucecc line[%d]\n",
__func__, __LINE__);
}
printk(KERN_DEBUG "mtp: mtp_ctrlrequest "\
"%02x.%02x v%04x i%04x l%u\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_PTPREQUEST_CANCELIO:
DEBUG_MTPB("[%s]\tline=[%d]w_v=%x, w_i=%x, w_l=%x\n",
__func__, __LINE__, w_value, w_index, w_length);
/* if (w_value == 0x00 && w_index ==
mtpg_interface_desc.bInterfaceNumber
&& w_length == 0x06) */
if (w_value == 0x00 && w_length == 0x06) {
DEBUG_MTPB("[%s]PTPREQUESTCANCLIO line[%d]\n",
__func__, __LINE__);
value = w_length;
cdev->gadget->ep0->driver_data = dev;
req->complete = mtp_complete_cancel_io;
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0,
req, GFP_ATOMIC);
if (value < 0) {
printk(KERN_ERR "[%s:%d]Error usb_ep_queue\n",
__func__, __LINE__);
} else
DEBUG_MTPB("[%s] ep-queue-sucecc line[%d]\n",
__func__, __LINE__);
}
return value;
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_PTPREQUEST_RESET:
DEBUG_MTPB("[%s] USB_PTPREQUEST_RESET\tline = [%d]\n",
__func__, __LINE__);
signal_request = USB_PTPREQUEST_RESET;
break;
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_PTPREQUEST_GETSTATUS:
signal_request = USB_PTPREQUEST_GETSTATUS;
break;
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_PTPREQUEST_GETEVENT:
signal_request = USB_PTPREQUEST_GETEVENT;
break;
default:
DEBUG_MTPB("[%s] INVALID REQUEST \tline = [%d]\n",
__func__, __LINE__);
return value;
}
value = mtp_send_signal(signal_request);
return value;
}
#if 0
static int mtp_bind_config(struct usb_configuration *c, bool ptp_config)
{
struct mtpg_dev *mtpg = the_mtpg;
int status = 0;
if (strings_dev_mtp[F_MTP_IDX].id == 0) {
status = usb_string_id(c->cdev);
if (status < 0)
return status;
strings_dev_mtp[F_MTP_IDX].id = status;
mtpg_interface_desc.iInterface = status;
}
mtpg->cdev = c->cdev;
mtpg->function.name = mtpg_longname;
mtpg->function.strings = mtpg_dev_strings;
/*Test the switch */
if (ptp_config) {
mtpg->function.fs_descriptors = fs_ptp_descs;
mtpg->function.hs_descriptors = hs_ptp_descs;
if (gadget_is_superspeed(c->cdev->gadget))
mtpg->function.ss_descriptors = ss_ptpg_descs;
} else {
mtpg->function.fs_descriptors = fs_mtpg_desc;
mtpg->function.hs_descriptors = hs_mtpg_desc;
if (gadget_is_superspeed(c->cdev->gadget))
mtpg->function.ss_descriptors = ss_mtpg_descs;
}
mtpg->function.bind = mtpg_function_bind;
mtpg->function.unbind = mtpg_function_unbind;
mtpg->function.set_alt = mtpg_function_set_alt;
mtpg->function.disable = mtpg_function_disable;
#ifdef CONFIG_USB_ANDROID_SAMSUNG_COMPOSITE
mtpg->function.set_config_desc = mtp_set_config_desc;
#endif
return usb_add_function(c, &mtpg->function);
}
#endif
static int mtp_setup(struct mtp_instance *fi_mtp)
{
struct mtpg_dev *mtpg;
int rc;
int err;
printk(KERN_DEBUG "[%s] \tline = [%d]\n", __func__, __LINE__);
memset(guid_info, '0', 1);
mtpg = kzalloc(sizeof(*mtpg), GFP_KERNEL);
if (!mtpg) {
printk(KERN_ERR "mtpg_dev_alloc memory failed\n");
return -ENOMEM;
}
if (fi_mtp != NULL)
fi_mtp->dev = mtpg;
spin_lock_init(&mtpg->lock);
init_waitqueue_head(&mtpg->intr_wq);
init_waitqueue_head(&mtpg->read_wq);
init_waitqueue_head(&mtpg->write_wq);
atomic_set(&mtpg->open_excl, 0);
atomic_set(&mtpg->read_excl, 0);
atomic_set(&mtpg->write_excl, 0);
atomic_set(&mtpg->wintfd_excl, 0);
INIT_LIST_HEAD(&mtpg->rx_idle);
INIT_LIST_HEAD(&mtpg->rx_done);
INIT_LIST_HEAD(&mtpg->tx_idle);
INIT_LIST_HEAD(&mtpg->intr_idle);
mtpg->wq = create_singlethread_workqueue("mtp_read_send");
if (!mtpg->wq) {
printk(KERN_ERR "mtpg_dev_alloc work queue creation failed\n");
rc = -ENOMEM;
goto err_work;
}
INIT_WORK(&mtpg->read_send_work, read_send_work);
/* the_mtpg must be set before calling usb_gadget_register_driver */
the_mtpg = mtpg;
rc = misc_register(&mtpg_device);
if (rc != 0) {
printk(KERN_ERR " misc_register of mtpg Failed\n");
goto err_misc_register;
}
err = device_create_file(mtpg_device.this_device, &dev_attr_guid);
if (err) {
printk(KERN_DEBUG "mtp: %s failed to create guid attr\n",
__func__);
return err;
} else
printk(KERN_DEBUG "mtp: %s success to create guid attr\n",
__func__);
return 0;
err_work:
err_misc_register:
the_mtpg = NULL;
kfree(mtpg);
printk(KERN_ERR "mtp gadget driver failed to initialize\n");
return rc;
}
static void mtp_cleanup(void)
{
struct mtpg_dev *mtpg = the_mtpg;
printk(KERN_DEBUG "[%s:::%d]\n", __func__, __LINE__);
if (!mtpg)
return;
misc_deregister(&mtpg_device);
the_mtpg = NULL;
kfree(mtpg);
}
static int mtp_setup_configfs(struct mtp_instance *fi_mtp)
{
return mtp_setup(fi_mtp);
}
static struct mtp_instance *to_mtp_instance(struct config_item *item)
{
return container_of(to_config_group(item), struct mtp_instance,
func_inst.group);
}
static void mtp_attr_release(struct config_item *item)
{
struct mtp_instance *fi_mtp = to_mtp_instance(item);
usb_put_function_instance(&fi_mtp->func_inst);
}
static struct configfs_item_operations mtp_item_ops = {
.release = mtp_attr_release,
};
static struct config_item_type mtp_func_type = {
.ct_item_ops = &mtp_item_ops,
.ct_owner = THIS_MODULE,
};
static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi)
{
return container_of(fi, struct mtp_instance, func_inst);
}
static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name)
{
struct mtp_instance *fi_mtp;
char *ptr;
int name_len;
name_len = strlen(name) + 1;
if (name_len > MAX_INST_NAME_LEN)
return -ENAMETOOLONG;
ptr = kstrndup(name, name_len, GFP_KERNEL);
if (!ptr)
return -ENOMEM;
fi_mtp = to_fi_mtp(fi);
fi_mtp->name = ptr;
return 0;
}
static void mtp_free_inst(struct usb_function_instance *fi)
{
struct mtp_instance *fi_mtp;
fi_mtp = to_fi_mtp(fi);
kfree(fi_mtp->name);
mtp_cleanup();
kfree(fi_mtp);
}
struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config)
{
struct mtp_instance *fi_mtp;
int ret = 0;
struct usb_os_desc *descs[1];
char *names[1];
fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL);
if (!fi_mtp)
return ERR_PTR(-ENOMEM);
fi_mtp->func_inst.set_inst_name = mtp_set_inst_name;
fi_mtp->func_inst.free_func_inst = mtp_free_inst;
fi_mtp->mtp_os_desc.ext_compat_id = fi_mtp->mtp_ext_compat_id;
INIT_LIST_HEAD(&fi_mtp->mtp_os_desc.ext_prop);
descs[0] = &fi_mtp->mtp_os_desc;
names[0] = "MTP";
if (mtp_config) {
ret = mtp_setup_configfs(fi_mtp);
if (ret) {
kfree(fi_mtp);
pr_err("Error setting MTP\n");
return ERR_PTR(ret);
}
} else
fi_mtp->dev = the_mtpg;
config_group_init_type_name(&fi_mtp->func_inst.group,
"", &mtp_func_type);
return &fi_mtp->func_inst;
}
EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp);
static struct usb_function_instance *mtp_alloc_inst(void)
{
return alloc_inst_mtp_ptp(true);
}
static int mtp_ctrlreq_configfs(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
return mtp_ctrlrequest(f->config->cdev, ctrl);
}
static void mtp_free(struct usb_function *f)
{
/*NO-OP: no function specific resource allocation in mtp_alloc*/
}
struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi,
bool mtp_config)
{
struct mtp_instance *fi_mtp = to_fi_mtp(fi);
struct mtpg_dev *dev;
#ifdef CONFIG_USB_CONFIGFS_UEVENT
struct usb_function *function;
#endif
/*
* PTP piggybacks on MTP function so make sure we have
* created MTP function before we associate this PTP
* function with a gadget configuration.
*/
if (fi_mtp->dev == NULL) {
pr_err("Error: Create MTP function before linking"
" PTP function with a gadget configuration\n");
pr_err("\t1: Delete existing PTP function if any\n");
pr_err("\t2: Create MTP function\n");
pr_err("\t3: Create and symlink PTP function"
" with a gadget configuration\n");
return NULL;
}
dev = fi_mtp->dev;
#ifdef CONFIG_USB_CONFIGFS_UEVENT
if (mtp_config) {
function = &dev->function;
function->name = mtpg_longname;
function->fs_descriptors = fs_mtpg_desc;
function->hs_descriptors = hs_mtpg_desc;
function->ss_descriptors = ss_mtpg_descs;
} else {
function = &dev->function_ptp;
function->name = DRIVER_NAME_PTP;
function->fs_descriptors = fs_ptp_descs;
function->hs_descriptors = hs_ptp_descs;
function->ss_descriptors = ss_ptpg_descs;
}
function->strings = mtpg_dev_strings;
function->bind = mtpg_function_bind;
function->unbind = mtpg_function_unbind;
function->set_alt = mtpg_function_set_alt;
function->disable = mtpg_function_disable;
function->ctrlrequest = mtp_ctrlreq_configfs;
function->free_func = mtp_free;
#ifdef CONFIG_USB_ANDROID_SAMSUNG_COMPOSITE
function->set_config_desc = mtp_set_config_desc;
#endif
return function;
#else
dev->function.name = mtpg_longname;
dev->function.strings = mtpg_dev_strings;
if (mtp_config) {
dev->function.fs_descriptors = fs_mtpg_desc;
dev->function.hs_descriptors = hs_mtpg_desc;
dev->function.ss_descriptors = ss_mtpg_descs;
} else {
dev->function.fs_descriptors = fs_ptp_descs;
dev->function.hs_descriptors = hs_ptp_descs;
dev->function.ss_descriptors = ss_ptpg_descs;
}
dev->function.bind = mtpg_function_bind;
dev->function.unbind = mtpg_function_unbind;
dev->function.set_alt = mtpg_function_set_alt;
dev->function.disable = mtpg_function_disable;
dev->function.setup = mtp_ctrlreq_configfs;
dev->function.free_func = mtp_free;
return &dev->function;
#endif
}
EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp);
static struct usb_function *mtp_alloc(struct usb_function_instance *fi)
{
return function_alloc_mtp_ptp(fi, true);
}
DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc);
MODULE_AUTHOR("Deepak And Madhukar");
MODULE_LICENSE("GPL");
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