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[media] staging: lirc_sasem: remove 

This driver was merged in 2010 and never had the necessary work done
to promote it out of staging (port to rc-core), so remove it.

I have not managed to track down the hardware. If anyone has the
hardware and would like a driver for it, please contact me and
hopefully we can work together to write a new driver.

Signed-off-by: Sean Young <sean@mess.org>
Cc: Oliver Stabel <oliver.stabel@gmx.de>
Cc: Tim Davies <tim@opensystems.net.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2017-03-07 17:09:11 -03:00 committed by Mauro Carvalho Chehab
parent e662671619
commit 51bb3fd788
3 changed files with 0 additions and 906 deletions
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6
drivers/staging/media/lirc/Kconfig
View File

@ -12,12 +12,6 @@ menuconfig LIRC_STAGING
if LIRC_STAGING
config LIRC_SASEM
tristate "Sasem USB IR Remote"
depends on LIRC && USB
help
Driver for the Sasem OnAir Remocon-V or Dign HV5 HTPC IR/VFD Module
config LIRC_ZILOG
tristate "Zilog/Hauppauge IR Transmitter"
depends on LIRC && I2C

1
drivers/staging/media/lirc/Makefile
View File

@ -3,5 +3,4 @@
# Each configuration option enables a list of files.
obj-$(CONFIG_LIRC_SASEM) += lirc_sasem.o
obj-$(CONFIG_LIRC_ZILOG) += lirc_zilog.o

899
drivers/staging/media/lirc/lirc_sasem.c
View File

@ -1,899 +0,0 @@
/*
* lirc_sasem.c - USB remote support for LIRC
* Version 0.5
*
* Copyright (C) 2004-2005 Oliver Stabel <oliver.stabel@gmx.de>
* Tim Davies <tim@opensystems.net.au>
*
* This driver was derived from:
* Venky Raju <dev@venky.ws>
* "lirc_imon - "LIRC/VFD driver for Ahanix/Soundgraph IMON IR/VFD"
* Paul Miller <pmiller9@users.sourceforge.net>'s 2003-2004
* "lirc_atiusb - USB remote support for LIRC"
* Culver Consulting Services <henry@culcon.com>'s 2003
* "Sasem OnAir VFD/IR USB driver"
*
*
* NOTE - The LCDproc iMon driver should work with this module. More info at
* http://www.frogstorm.info/sasem
*/
/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/ktime.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#define MOD_AUTHOR "Oliver Stabel <oliver.stabel@gmx.de>, " \
"Tim Davies <tim@opensystems.net.au>"
#define MOD_DESC "USB Driver for Sasem Remote Controller V1.1"
#define MOD_NAME "lirc_sasem"
#define MOD_VERSION "0.5"
#define VFD_MINOR_BASE 144 /* Same as LCD */
#define DEVICE_NAME "lcd%d"
#define BUF_CHUNK_SIZE 8
#define BUF_SIZE 128
#define IOCTL_LCD_CONTRAST 1
/*** P R O T O T Y P E S ***/
/* USB Callback prototypes */
static int sasem_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void sasem_disconnect(struct usb_interface *interface);
static void usb_rx_callback(struct urb *urb);
static void usb_tx_callback(struct urb *urb);
/* VFD file_operations function prototypes */
static int vfd_open(struct inode *inode, struct file *file);
static long vfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
static int vfd_close(struct inode *inode, struct file *file);
static ssize_t vfd_write(struct file *file, const char __user *buf,
size_t n_bytes, loff_t *pos);
/* LIRC driver function prototypes */
static int ir_open(void *data);
static void ir_close(void *data);
/*** G L O B A L S ***/
#define SASEM_DATA_BUF_SZ 32
struct sasem_context {
struct usb_device *dev;
int vfd_isopen; /* VFD port has been opened */
unsigned int vfd_contrast; /* VFD contrast */
int ir_isopen; /* IR port has been opened */
int dev_present; /* USB device presence */
struct mutex ctx_lock; /* to lock this object */
wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
struct lirc_driver *driver;
struct usb_endpoint_descriptor *rx_endpoint;
struct usb_endpoint_descriptor *tx_endpoint;
struct urb *rx_urb;
struct urb *tx_urb;
unsigned char usb_rx_buf[8];
unsigned char usb_tx_buf[8];
struct tx_t {
unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data
* buffer
*/
struct completion finished; /* wait for write to finish */
atomic_t busy; /* write in progress */
int status; /* status of tx completion */
} tx;
/* for dealing with repeat codes (wish there was a toggle bit!) */
ktime_t presstime;
char lastcode[8];
int codesaved;
};
/* VFD file operations */
static const struct file_operations vfd_fops = {
.owner = THIS_MODULE,
.open = &vfd_open,
.write = vfd_write,
.unlocked_ioctl = &vfd_ioctl,
.release = &vfd_close,
.llseek = noop_llseek,
};
/* USB Device ID for Sasem USB Control Board */
static struct usb_device_id sasem_usb_id_table[] = {
/* Sasem USB Control Board */
{ USB_DEVICE(0x11ba, 0x0101) },
/* Terminating entry */
{}
};
/* USB Device data */
static struct usb_driver sasem_driver = {
.name = MOD_NAME,
.probe = sasem_probe,
.disconnect = sasem_disconnect,
.id_table = sasem_usb_id_table,
};
static struct usb_class_driver sasem_class = {
.name = DEVICE_NAME,
.fops = &vfd_fops,
.minor_base = VFD_MINOR_BASE,
};
/* to prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_lock);
static int debug;
/*** M O D U L E C O D E ***/
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_DESCRIPTION(MOD_DESC);
MODULE_LICENSE("GPL");
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
static void delete_context(struct sasem_context *context)
{
usb_free_urb(context->tx_urb); /* VFD */
usb_free_urb(context->rx_urb); /* IR */
lirc_buffer_free(context->driver->rbuf);
kfree(context->driver->rbuf);
kfree(context->driver);
kfree(context);
}
static void deregister_from_lirc(struct sasem_context *context)
{
int retval;
int minor = context->driver->minor;
retval = lirc_unregister_driver(minor);
if (retval)
dev_err(&context->dev->dev,
"%s: unable to deregister from lirc (%d)\n",
__func__, retval);
else
dev_info(&context->dev->dev,
"Deregistered Sasem driver (minor:%d)\n", minor);
}
/**
* Called when the VFD device (e.g. /dev/usb/lcd)
* is opened by the application.
*/
static int vfd_open(struct inode *inode, struct file *file)
{
struct usb_interface *interface;
struct sasem_context *context = NULL;
int subminor;
int retval = 0;
/* prevent races with disconnect */
mutex_lock(&disconnect_lock);
subminor = iminor(inode);
interface = usb_find_interface(&sasem_driver, subminor);
if (!interface) {
pr_err("%s: could not find interface for minor %d\n",
__func__, subminor);
retval = -ENODEV;
goto exit;
}
context = usb_get_intfdata(interface);
if (!context) {
dev_err(&interface->dev, "no context found for minor %d\n",
subminor);
retval = -ENODEV;
goto exit;
}
mutex_lock(&context->ctx_lock);
if (context->vfd_isopen) {
dev_err(&interface->dev,
"%s: VFD port is already open", __func__);
retval = -EBUSY;
} else {
context->vfd_isopen = 1;
file->private_data = context;
dev_info(&interface->dev, "VFD port opened\n");
}
mutex_unlock(&context->ctx_lock);
exit:
mutex_unlock(&disconnect_lock);
return retval;
}
/**
* Called when the VFD device (e.g. /dev/usb/lcd)
* is closed by the application.
*/
static long vfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct sasem_context *context;
context = (struct sasem_context *) file->private_data;
if (!context) {
pr_err("%s: no context for device\n", __func__);
return -ENODEV;
}
mutex_lock(&context->ctx_lock);
switch (cmd) {
case IOCTL_LCD_CONTRAST:
if (arg > 1000)
arg = 1000;
context->vfd_contrast = (unsigned int)arg;
break;
default:
pr_info("Unknown IOCTL command\n");
mutex_unlock(&context->ctx_lock);
return -ENOIOCTLCMD; /* not supported */
}
mutex_unlock(&context->ctx_lock);
return 0;
}
/**
* Called when the VFD device (e.g. /dev/usb/lcd)
* is closed by the application.
*/
static int vfd_close(struct inode *inode, struct file *file)
{
struct sasem_context *context = NULL;
int retval = 0;
context = (struct sasem_context *) file->private_data;
if (!context) {
pr_err("%s: no context for device\n", __func__);
return -ENODEV;
}
mutex_lock(&context->ctx_lock);
if (!context->vfd_isopen) {
dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
retval = -EIO;
} else {
context->vfd_isopen = 0;
dev_info(&context->dev->dev, "VFD port closed\n");
if (!context->dev_present && !context->ir_isopen) {
/* Device disconnected before close and IR port is
* not open. If IR port is open, context will be
* deleted by ir_close.
*/
mutex_unlock(&context->ctx_lock);
delete_context(context);
return retval;
}
}
mutex_unlock(&context->ctx_lock);
return retval;
}
/**
* Sends a packet to the VFD.
*/
static int send_packet(struct sasem_context *context)
{
unsigned int pipe;
int interval = 0;
int retval = 0;
pipe = usb_sndintpipe(context->dev,
context->tx_endpoint->bEndpointAddress);
interval = context->tx_endpoint->bInterval;
usb_fill_int_urb(context->tx_urb, context->dev, pipe,
context->usb_tx_buf, sizeof(context->usb_tx_buf),
usb_tx_callback, context, interval);
context->tx_urb->actual_length = 0;
init_completion(&context->tx.finished);
atomic_set(&context->tx.busy, 1);
retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
if (retval) {
atomic_set(&context->tx.busy, 0);
dev_err(&context->dev->dev, "error submitting urb (%d)\n",
retval);
} else {
/* Wait for transmission to complete (or abort) */
mutex_unlock(&context->ctx_lock);
wait_for_completion(&context->tx.finished);
mutex_lock(&context->ctx_lock);
retval = context->tx.status;
if (retval)
dev_err(&context->dev->dev,
"packet tx failed (%d)\n", retval);
}
return retval;
}
/**
* Writes data to the VFD. The Sasem VFD is 2x16 characters
* and requires data in 9 consecutive USB interrupt packets,
* each packet carrying 8 bytes.
*/
static ssize_t vfd_write(struct file *file, const char __user *buf,
size_t n_bytes, loff_t *pos)
{
int i;
int retval = 0;
struct sasem_context *context;
int *data_buf = NULL;
context = (struct sasem_context *) file->private_data;
if (!context) {
pr_err("%s: no context for device\n", __func__);
return -ENODEV;
}
mutex_lock(&context->ctx_lock);
if (!context->dev_present) {
pr_err("%s: no Sasem device present\n", __func__);
retval = -ENODEV;
goto exit;
}
if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
dev_err(&context->dev->dev, "%s: invalid payload size\n",
__func__);
retval = -EINVAL;
goto exit;
}
data_buf = memdup_user(buf, n_bytes);
if (IS_ERR(data_buf)) {
mutex_unlock(&context->ctx_lock);
return PTR_ERR(data_buf);
}
memcpy(context->tx.data_buf, data_buf, n_bytes);
/* Pad with spaces */
for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
context->tx.data_buf[i] = ' ';
/* Nine 8 byte packets to be sent */
/* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
* will clear the VFD
*/
for (i = 0; i < 9; i++) {
switch (i) {
case 0:
memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
context->usb_tx_buf[1] = (context->vfd_contrast) ?
(0x2B - (context->vfd_contrast - 1) / 250)
: 0x2B;
break;
case 1:
memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
break;
case 2:
memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
break;
case 3:
memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
break;
case 4:
memcpy(context->usb_tx_buf,
context->tx.data_buf + 8, 8);
break;
case 5:
memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
break;
case 6:
memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
break;
case 7:
memcpy(context->usb_tx_buf,
context->tx.data_buf + 16, 8);
break;
case 8:
memcpy(context->usb_tx_buf,
context->tx.data_buf + 24, 8);
break;
}
retval = send_packet(context);
if (retval) {
dev_err(&context->dev->dev,
"send packet failed for packet #%d\n", i);
goto exit;
}
}
exit:
mutex_unlock(&context->ctx_lock);
kfree(data_buf);
return (!retval) ? n_bytes : retval;
}
/**
* Callback function for USB core API: transmit data
*/
static void usb_tx_callback(struct urb *urb)
{
struct sasem_context *context;
if (!urb)
return;
context = (struct sasem_context *) urb->context;
if (!context)
return;
context->tx.status = urb->status;
/* notify waiters that write has finished */
atomic_set(&context->tx.busy, 0);
complete(&context->tx.finished);
}
/**
* Called by lirc_dev when the application opens /dev/lirc
*/
static int ir_open(void *data)
{
int retval = 0;
struct sasem_context *context;
/* prevent races with disconnect */
mutex_lock(&disconnect_lock);
context = data;
mutex_lock(&context->ctx_lock);
if (context->ir_isopen) {
dev_err(&context->dev->dev, "%s: IR port is already open\n",
__func__);
retval = -EBUSY;
goto exit;
}
usb_fill_int_urb(context->rx_urb, context->dev,
usb_rcvintpipe(context->dev,
context->rx_endpoint->bEndpointAddress),
context->usb_rx_buf, sizeof(context->usb_rx_buf),
usb_rx_callback, context, context->rx_endpoint->bInterval);
retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
if (retval)
dev_err(&context->dev->dev,
"usb_submit_urb failed for ir_open (%d)\n", retval);
else {
context->ir_isopen = 1;
dev_info(&context->dev->dev, "IR port opened\n");
}
exit:
mutex_unlock(&context->ctx_lock);
mutex_unlock(&disconnect_lock);
return retval;
}
/**
* Called by lirc_dev when the application closes /dev/lirc
*/
static void ir_close(void *data)
{
struct sasem_context *context;
context = data;
if (!context) {
pr_err("%s: no context for device\n", __func__);
return;
}
mutex_lock(&context->ctx_lock);
usb_kill_urb(context->rx_urb);
context->ir_isopen = 0;
pr_info("IR port closed\n");
if (!context->dev_present) {
/*
* Device disconnected while IR port was
* still open. Driver was not deregistered
* at disconnect time, so do it now.
*/
deregister_from_lirc(context);
if (!context->vfd_isopen) {
mutex_unlock(&context->ctx_lock);
delete_context(context);
return;
}
/* If VFD port is open, context will be deleted by vfd_close */
}
mutex_unlock(&context->ctx_lock);
}
/**
* Process the incoming packet
*/
static void incoming_packet(struct sasem_context *context,
struct urb *urb)
{
int len = urb->actual_length;
unsigned char *buf = urb->transfer_buffer;
u64 ns;
ktime_t kt;
if (len != 8) {
dev_warn(&context->dev->dev,
"%s: invalid incoming packet size (%d)\n",
__func__, len);
return;
}
if (debug)
dev_info(&context->dev->dev, "Incoming data: %*ph\n", len, buf);
/*
* Lirc could deal with the repeat code, but we really need to block it
* if it arrives too late. Otherwise we could repeat the wrong code.
*/
/* get the time since the last button press */
kt = ktime_get();
ns = ktime_to_ns(ktime_sub(kt, context->presstime));
if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
/*
* the repeat code is being sent, so we copy
* the old code to LIRC
*/
/*
* NOTE: Only if the last code was less than 250ms ago
* - no one should be able to push another (undetected) button
* in that time and then get a false repeat of the previous
* press but it is long enough for a genuine repeat
*/
if ((ns < 250 * NSEC_PER_MSEC) && (context->codesaved != 0)) {
memcpy(buf, &context->lastcode, 8);
context->presstime = kt;
}
} else {
/* save the current valid code for repeats */
memcpy(&context->lastcode, buf, 8);
/*
* set flag to signal a valid code was save;
* just for safety reasons
*/
context->codesaved = 1;
context->presstime = kt;
}
lirc_buffer_write(context->driver->rbuf, buf);
wake_up(&context->driver->rbuf->wait_poll);
}
/**
* Callback function for USB core API: receive data
*/
static void usb_rx_callback(struct urb *urb)
{
struct sasem_context *context;
if (!urb)
return;
context = (struct sasem_context *) urb->context;
if (!context)
return;
switch (urb->status) {
case -ENOENT: /* usbcore unlink successful! */
return;
case 0:
if (context->ir_isopen)
incoming_packet(context, urb);
break;
default:
dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
__func__, urb->status);
break;
}
usb_submit_urb(context->rx_urb, GFP_ATOMIC);
}
/**
* Callback function for USB core API: Probe
*/
static int sasem_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *dev = NULL;
struct usb_host_interface *iface_desc = NULL;
struct usb_endpoint_descriptor *rx_endpoint = NULL;
struct usb_endpoint_descriptor *tx_endpoint = NULL;
struct urb *rx_urb = NULL;
struct urb *tx_urb = NULL;
struct lirc_driver *driver = NULL;
struct lirc_buffer *rbuf = NULL;
int lirc_minor = 0;
int num_endpoints;
int retval = 0;
int vfd_ep_found;
int ir_ep_found;
int alloc_status;
struct sasem_context *context = NULL;
int i;
dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
dev = usb_get_dev(interface_to_usbdev(interface));
iface_desc = interface->cur_altsetting;
num_endpoints = iface_desc->desc.bNumEndpoints;
/*
* Scan the endpoint list and set:
* first input endpoint = IR endpoint
* first output endpoint = VFD endpoint
*/
ir_ep_found = 0;
vfd_ep_found = 0;
for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
struct usb_endpoint_descriptor *ep;
ep = &iface_desc->endpoint [i].desc;
if (!ir_ep_found &&
usb_endpoint_is_int_in(ep)) {
rx_endpoint = ep;
ir_ep_found = 1;
if (debug)
dev_info(&interface->dev,
"%s: found IR endpoint\n", __func__);
} else if (!vfd_ep_found &&
usb_endpoint_is_int_out(ep)) {
tx_endpoint = ep;
vfd_ep_found = 1;
if (debug)
dev_info(&interface->dev,
"%s: found VFD endpoint\n", __func__);
}
}
/* Input endpoint is mandatory */
if (!ir_ep_found) {
dev_err(&interface->dev,
"%s: no valid input (IR) endpoint found.\n", __func__);
retval = -ENODEV;
goto exit;
}
if (!vfd_ep_found)
dev_info(&interface->dev,
"%s: no valid output (VFD) endpoint found.\n",
__func__);
/* Allocate memory */
alloc_status = 0;
context = kzalloc(sizeof(*context), GFP_KERNEL);
if (!context) {
alloc_status = 1;
goto alloc_status_switch;
}
driver = kzalloc(sizeof(*driver), GFP_KERNEL);
if (!driver) {
alloc_status = 2;
goto alloc_status_switch;
}
rbuf = kmalloc(sizeof(*rbuf), GFP_KERNEL);
if (!rbuf) {
alloc_status = 3;
goto alloc_status_switch;
}
if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
dev_err(&interface->dev,
"%s: lirc_buffer_init failed\n", __func__);
alloc_status = 4;
goto alloc_status_switch;
}
rx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!rx_urb) {
alloc_status = 5;
goto alloc_status_switch;
}
if (vfd_ep_found) {
tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!tx_urb) {
alloc_status = 6;
goto alloc_status_switch;
}
}
mutex_init(&context->ctx_lock);
strcpy(driver->name, MOD_NAME);
driver->minor = -1;
driver->code_length = 64;
driver->sample_rate = 0;
driver->features = LIRC_CAN_REC_LIRCCODE;
driver->data = context;
driver->rbuf = rbuf;
driver->set_use_inc = ir_open;
driver->set_use_dec = ir_close;
driver->dev = &interface->dev;
driver->owner = THIS_MODULE;
mutex_lock(&context->ctx_lock);
lirc_minor = lirc_register_driver(driver);
if (lirc_minor < 0) {
dev_err(&interface->dev,
"%s: lirc_register_driver failed\n", __func__);
alloc_status = 7;
retval = lirc_minor;
goto unlock;
} else
dev_info(&interface->dev,
"%s: Registered Sasem driver (minor:%d)\n",
__func__, lirc_minor);
/* Needed while unregistering! */
driver->minor = lirc_minor;
context->dev = dev;
context->dev_present = 1;
context->rx_endpoint = rx_endpoint;
context->rx_urb = rx_urb;
if (vfd_ep_found) {
context->tx_endpoint = tx_endpoint;
context->tx_urb = tx_urb;
context->vfd_contrast = 1000; /* range 0 - 1000 */
}
context->driver = driver;
usb_set_intfdata(interface, context);
if (vfd_ep_found) {
if (debug)
dev_info(&interface->dev,
"Registering VFD with sysfs\n");
if (usb_register_dev(interface, &sasem_class))
/* Not a fatal error, so ignore */
dev_info(&interface->dev,
"%s: could not get a minor number for VFD\n",
__func__);
}
dev_info(&interface->dev,
"%s: Sasem device on usb<%d:%d> initialized\n",
__func__, dev->bus->busnum, dev->devnum);
unlock:
mutex_unlock(&context->ctx_lock);
alloc_status_switch:
switch (alloc_status) {
case 7:
if (vfd_ep_found)
usb_free_urb(tx_urb);
case 6:
usb_free_urb(rx_urb);
/* fall-through */
case 5:
lirc_buffer_free(rbuf);
/* fall-through */
case 4:
kfree(rbuf);
/* fall-through */
case 3:
kfree(driver);
/* fall-through */
case 2:
kfree(context);
context = NULL;
/* fall-through */
case 1:
if (retval == 0)
retval = -ENOMEM;
}
exit:
return retval;
}
/**
* Callback function for USB core API: disconnect
*/
static void sasem_disconnect(struct usb_interface *interface)
{
struct sasem_context *context;
/* prevent races with ir_open()/vfd_open() */
mutex_lock(&disconnect_lock);
context = usb_get_intfdata(interface);
mutex_lock(&context->ctx_lock);
dev_info(&interface->dev, "%s: Sasem device disconnected\n",
__func__);
usb_set_intfdata(interface, NULL);
context->dev_present = 0;
/* Stop reception */
usb_kill_urb(context->rx_urb);
/* Abort ongoing write */
if (atomic_read(&context->tx.busy)) {
usb_kill_urb(context->tx_urb);
wait_for_completion(&context->tx.finished);
}
/* De-register from lirc_dev if IR port is not open */
if (!context->ir_isopen)
deregister_from_lirc(context);
usb_deregister_dev(interface, &sasem_class);
mutex_unlock(&context->ctx_lock);
if (!context->ir_isopen && !context->vfd_isopen)
delete_context(context);
mutex_unlock(&disconnect_lock);
}
module_usb_driver(sasem_driver);