- 根目录:
- drivers
- staging
- lirc
- lirc_imon.c
/*
* lirc_imon.c: LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD
* including the iMON PAD model
*
* Copyright(C) 2004 Venky Raju(dev@venky.ws)
* Copyright(C) 2009 Jarod Wilson <jarod@wilsonet.com>
*
* lirc_imon 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#define MOD_AUTHOR "Venky Raju <dev@venky.ws>"
#define MOD_DESC "Driver for SoundGraph iMON MultiMedia IR/Display"
#define MOD_NAME "lirc_imon"
#define MOD_VERSION "0.8"
#define DISPLAY_MINOR_BASE 144
#define DEVICE_NAME "lcd%d"
#define BUF_CHUNK_SIZE 4
#define BUF_SIZE 128
#define BIT_DURATION 250 /* each bit received is 250us */
/*** P R O T O T Y P E S ***/
/* USB Callback prototypes */
static int imon_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void imon_disconnect(struct usb_interface *interface);
static void usb_rx_callback(struct urb *urb);
static void usb_tx_callback(struct urb *urb);
/* suspend/resume support */
static int imon_resume(struct usb_interface *intf);
static int imon_suspend(struct usb_interface *intf, pm_message_t message);
/* Display file_operations function prototypes */
static int display_open(struct inode *inode, struct file *file);
static int display_close(struct inode *inode, struct file *file);
/* VFD write operation */
static ssize_t vfd_write(struct file *file, const char *buf,
size_t n_bytes, loff_t *pos);
/* LIRC driver function prototypes */
static int ir_open(void *data);
static void ir_close(void *data);
/* Driver init/exit prototypes */
static int __init imon_init(void);
static void __exit imon_exit(void);
/*** G L O B A L S ***/
#define IMON_DATA_BUF_SZ 35
struct imon_context {
struct usb_device *usbdev;
/* Newer devices have two interfaces */
int display; /* not all controllers do */
int display_isopen; /* display port has been opened */
int ir_isopen; /* IR port open */
int dev_present; /* USB device presence */
struct mutex ctx_lock; /* to lock this object */
wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
int vfd_proto_6p; /* some VFD require a 6th packet */
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 rx_data {
int count; /* length of 0 or 1 sequence */
int prev_bit; /* logic level of sequence */
int initial_space; /* initial space flag */
} rx;
struct tx_t {
unsigned char data_buf[IMON_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;
};
static const struct file_operations display_fops = {
.owner = THIS_MODULE,
.open = &display_open,
.write = &vfd_write,
.release = &display_close,
.llseek = noop_llseek,
};
/*
* USB Device ID for iMON USB Control Boards
*
* The Windows drivers contain 6 different inf files, more or less one for
* each new device until the 0x0034-0x0046 devices, which all use the same
* driver. Some of the devices in the 34-46 range haven't been definitively
* identified yet. Early devices have either a TriGem Computer, Inc. or a
* Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
* devices use the SoundGraph vendor ID (0x15c2).
*/
static struct usb_device_id imon_usb_id_table[] = {
/* TriGem iMON (IR only) -- TG_iMON.inf */
{ USB_DEVICE(0x0aa8, 0x8001) },
/* SoundGraph iMON (IR only) -- sg_imon.inf */
{ USB_DEVICE(0x04e8, 0xff30) },
/* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
{ USB_DEVICE(0x0aa8, 0xffda) },
/* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
{ USB_DEVICE(0x15c2, 0xffda) },
{}
};
/* Some iMON VFD models requires a 6th packet for VFD writes */
static struct usb_device_id vfd_proto_6p_list[] = {
{ USB_DEVICE(0x15c2, 0xffda) },
{}
};
/* Some iMON devices have no lcd/vfd, don't set one up */
static struct usb_device_id ir_only_list[] = {
{ USB_DEVICE(0x0aa8, 0x8001) },
{ USB_DEVICE(0x04e8, 0xff30) },
{}
};
/* USB Device data */
static struct usb_driver imon_driver = {
.name = MOD_NAME,
.probe = imon_probe,
.disconnect = imon_disconnect,
.suspend = imon_suspend,
.resume = imon_resume,
.id_table = imon_usb_id_table,
};
static struct usb_class_driver imon_class = {
.name = DEVICE_NAME,
.fops = &display_fops,
.minor_base = DISPLAY_MINOR_BASE,
};
/* to prevent races between open() and disconnect(), probing, etc */
static DEFINE_MUTEX(driver_lock);
static int debug;
/*** M O D U L E C O D E ***/
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_DESCRIPTION(MOD_DESC);
MODULE_VERSION(MOD_VERSION);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
static void free_imon_context(struct imon_context *context)
{
struct device *dev = context->driver->dev;
usb_free_urb(context->tx_urb);
usb_free_urb(context->rx_urb);
lirc_buffer_free(context->driver->rbuf);
kfree(context->driver->rbuf);
kfree(context->driver);
kfree(context);
dev_dbg(dev, "%s: iMON context freed\n", __func__);
}
static void deregister_from_lirc(struct imon_context *context)
{
int retval;
int minor = context->driver->minor;
retval = lirc_unregister_driver(minor);
if (retval)
err("%s: unable to deregister from lirc(%d)",
__func__, retval);
else
printk(KERN_INFO MOD_NAME ": Deregistered iMON driver "
"(minor:%d)\n", minor);
}
/**
* Called when the Display device (e.g. /dev/lcd0)
* is opened by the application.
*/
static int display_open(struct inode *inode, struct file *file)
{
struct usb_interface *interface;
struct imon_context *context = NULL;
int subminor;
int retval = 0;
/* prevent races with disconnect */
mutex_lock(&driver_lock);
subminor = iminor(inode);
interface = usb_find_interface(&imon_driver, subminor);
if (!interface) {
err("%s: could not find interface for minor %d",
__func__, subminor);
retval = -ENODEV;
goto exit;
}
context = usb_get_intfdata(interface);
if (!context) {
err("%s: no context found for minor %d",
__func__, subminor);
retval = -ENODEV;
goto exit;
}
mutex_lock(&context->ctx_lock);
if (!context->display) {
err("%s: display not supported by device", __func__);
retval = -ENODEV;
} else if (context->display_isopen) {
err("%s: display port is already open", __func__);
retval = -EBUSY;
} else {
context->display_isopen = 1;
file->private_data = context;
dev_info(context->driver->dev, "display port opened\n");
}
mutex_unlock(&context->ctx_lock);
exit:
mutex_unlock(&driver_lock);
return retval;
}
/**
* Called when the display device (e.g. /dev/lcd0)
* is closed by the application.
*/
static int display_close(struct inode *inode, struct file *file)
{
struct imon_context *context = NULL;
int retval = 0;
context = file->private_data;
if (!context) {
err("%s: no context for device", __func__);
return -ENODEV;
}
mutex_lock(&context->ctx_lock);
if (!context->display) {
err("%s: display not supported by device", __func__);
retval = -ENODEV;
} else if (!context->display_isopen) {
err("%s: display is not open", __func__);
retval = -EIO;
} else {
context->display_isopen = 0;
dev_info(context->driver->dev, "display 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);
free_imon_context(context);
return retval;
}
}
mutex_unlock(&context->ctx_lock);
return retval;
}
/**
* Sends a packet to the device -- this function must be called
* with context->ctx_lock held.
*/
static int send_packet(struct imon_context *context)
{
unsigned int pipe;
int interval = 0;
int retval = 0;
/* Check if we need to use control or interrupt urb */
pipe = usb_sndintpipe(context->usbdev,
context->tx_endpoint->bEndpointAddress);
interval = context->tx_endpoint->bInterval;
usb_fill_int_urb(context->tx_urb, context->usbdev, 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);
err("%s: error submitting urb(%d)", __func__, retval);
} else {
/* Wait for transmission to complete (or abort) */
mutex_unlock(&context->ctx_lock);
retval = wait_for_completion_interruptible(
&context->tx.finished);
if (retval)
err("%s: task interrupted", __func__);
mutex_lock(&context->ctx_lock);
retval = context->tx.status;
if (retval)
err("%s: packet tx failed (%d)", __func__, retval);
}
return retval;
}
/**
* Writes data to the VFD. The iMON VFD is 2x16 characters
* and requires data in 5 consecutive USB interrupt packets,
* each packet but the last carrying 7 bytes.
*
* I don't know if the VFD board supports features such as
* scrolling, clearing rows, blanking, etc. so at
* the caller must provide a full screen of data. If fewer
* than 32 bytes are provided spaces will be appended to
* generate a full screen.
*/
static ssize_t vfd_write(struct file *file, const char *buf,
size_t n_bytes, loff_t *pos)
{
int i;
int offset;
int seq;
int retval = 0;
struct imon_context *context;
const unsigned char vfd_packet6[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
int *data_buf = NULL;
context = file->private_data;
if (!context) {
err("%s: no context for device", __func__);
return -ENODEV;
}
mutex_lock(&context->ctx_lock);
if (!context->dev_present) {
err("%s: no iMON device present", __func__);
retval = -ENODEV;
goto exit;
}
if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
err("%s: invalid payload size", __func__);
retval = -EINVAL;
goto exit;
}
data_buf = memdup_user(buf, n_bytes);
if (IS_ERR(data_buf)) {
retval = PTR_ERR(data_buf);
goto exit;
}
memcpy(context->tx.data_buf, data_buf, n_bytes);
/* Pad with spaces */
for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
context->tx.data_buf[i] = ' ';
for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
context->tx.data_buf[i] = 0xFF;
offset = 0;
seq = 0;
do {
memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
context->usb_tx_buf[7] = (unsigned char) seq;
retval = send_packet(context);
if (retval) {
err("%s: send packet failed for packet #%d",
__func__, seq/2);
goto exit;
} else {
seq += 2;
offset += 7;
}
} while (offset < IMON_DATA_BUF_SZ);
if (context->vfd_proto_6p) {
/* Send packet #6 */
memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
context->usb_tx_buf[7] = (unsigned char) seq;
retval = send_packet(context);
if (retval)
err("%s: send packet failed for packet #%d",
__func__, seq/2);
}
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 imon_context *context;
if (!urb)
return;
context = (struct imon_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);
return;
}
/**
* Called by lirc_dev when the application opens /dev/lirc
*/
static int ir_open(void *data)
{
int retval = 0;
struct imon_context *context;
/* prevent races with disconnect */
mutex_lock(&driver_lock);
context = (struct imon_context *)data;
/* initial IR protocol decode variables */
context->rx.count = 0;
context->rx.initial_space = 1;
context->rx.prev_bit = 0;
context->ir_isopen = 1;
dev_info(context->driver->dev, "IR port opened\n");
mutex_unlock(&driver_lock);
return retval;
}
/**
* Called by lirc_dev when the application closes /dev/lirc
*/
static void ir_close(void *data)
{
struct imon_context *context;
context = (struct imon_context *)data;
if (!context) {
err("%s: no context for device", __func__);
return;
}
mutex_lock(&context->ctx_lock);
context->ir_isopen = 0;
dev_info(context->driver->dev, "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->display_isopen) {
mutex_unlock(&context->ctx_lock);
free_imon_context(context);
return;
}
/*
* If display port is open, context will be deleted by
* display_close
*/
}
mutex_unlock(&context->ctx_lock);
return;
}
/**
* Convert bit count to time duration (in us) and submit
* the value to lirc_dev.
*/
static void submit_data(struct imon_context *context)
{
unsigned char buf[4];
int value = context->rx.count;
int i;
dev_dbg(context->driver->dev, "submitting data to LIRC\n");
value *= BIT_DURATION;
value &= PULSE_MASK;
if (context->rx.prev_bit)
value |= PULSE_BIT;
for (i = 0; i < 4; ++i)
buf[i] = value>>(i*8);
lirc_buffer_write(context->driver->rbuf, buf);
wake_up(&context->driver->rbuf->wait_poll);
return;
}
static inline int tv2int(const struct timeval *a, const struct timeval *b)
{
int usecs = 0;
int sec = 0;
if (b->tv_usec > a->tv_usec) {
usecs = 1000000;
sec--;
}
usecs += a->tv_usec - b->tv_usec;
sec += a->tv_sec - b->tv_sec;
sec *= 1000;
usecs /= 1000;
sec += usecs;
if (sec < 0)
sec = 1000;
return sec;
}
/**
* Process the incoming packet
*/
static void imon_incoming_packet(struct imon_context *context,
struct urb *urb, int intf)
{
int len = urb->actual_length;
unsigned char *buf = urb->transfer_buffer;
struct device *dev = context->driver->dev;
int octet, bit;
unsigned char mask;
int i;
/*
* just bail out if no listening IR client
*/
if (!context->ir_isopen)
return;
if (len != 8) {
dev_warn(dev, "imon %s: invalid incoming packet "
"size (len = %d, intf%d)\n", __func__, len, intf);
return;
}
if (debug) {
printk(KERN_INFO "raw packet: ");
for (i = 0; i < len; ++i)
printk("%02x ", buf[i]);
printk("\n");
}
/*
* Translate received data to pulse and space lengths.
* Received data is active low, i.e. pulses are 0 and
* spaces are 1.
*
* My original algorithm was essentially similar to
* Changwoo Ryu's with the exception that he switched
* the incoming bits to active high and also fed an
* initial space to LIRC at the start of a new sequence
* if the previous bit was a pulse.
*
* I've decided to adopt his algorithm.
*/
if (buf[7] == 1 && context->rx.initial_space) {
/* LIRC requires a leading space */
context->rx.prev_bit = 0;
context->rx.count = 4;
submit_data(context);
context->rx.count = 0;
}
for (octet = 0; octet < 5; ++octet) {
mask = 0x80;
for (bit = 0; bit < 8; ++bit) {
int curr_bit = !(buf[octet] & mask);
if (curr_bit != context->rx.prev_bit) {
if (context->rx.count) {
submit_data(context);
context->rx.count = 0;
}
context->rx.prev_bit = curr_bit;
}
++context->rx.count;
mask >>= 1;
}
}
if (buf[7] == 10) {
if (context->rx.count) {
submit_data(context);
context->rx.count = 0;
}
context->rx.initial_space = context->rx.prev_bit;
}
}
/**
* Callback function for USB core API: receive data
*/
static void usb_rx_callback(struct urb *urb)
{
struct imon_context *context;
unsigned char *buf;
int len;
int intfnum = 0;
if (!urb)
return;
context = (struct imon_context *)urb->context;
if (!context)
return;
buf = urb->transfer_buffer;
len = urb->actual_length;
switch (urb->status) {
case -ENOENT: /* usbcore unlink successful! */
return;
case 0:
imon_incoming_packet(context, urb, intfnum);
break;
default:
dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
__func__, urb->status);
break;
}
usb_submit_urb(context->rx_urb, GFP_ATOMIC);
return;
}
/**
* Callback function for USB core API: Probe
*/
static int imon_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *usbdev = 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;
struct device *dev = &interface->dev;
int ifnum;
int lirc_minor = 0;
int num_endpts;
int retval = 0;
int display_ep_found = 0;
int ir_ep_found = 0;
int alloc_status = 0;
int vfd_proto_6p = 0;
int code_length;
struct imon_context *context = NULL;
int i;
u16 vendor, product;
context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
if (!context) {
err("%s: kzalloc failed for context", __func__);
alloc_status = 1;
goto alloc_status_switch;
}
/*
* Try to auto-detect the type of display if the user hasn't set
* it by hand via the display_type modparam. Default is VFD.
*/
if (usb_match_id(interface, ir_only_list))
context->display = 0;
else
context->display = 1;
code_length = BUF_CHUNK_SIZE * 8;
usbdev = usb_get_dev(interface_to_usbdev(interface));
iface_desc = interface->cur_altsetting;
num_endpts = iface_desc->desc.bNumEndpoints;
ifnum = iface_desc->desc.bInterfaceNumber;
vendor = le16_to_cpu(usbdev->descriptor.idVendor);
product = le16_to_cpu(usbdev->descriptor.idProduct);
dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
__func__, vendor, product, ifnum);
/* prevent races probing devices w/multiple interfaces */
mutex_lock(&driver_lock);
/*
* Scan the endpoint list and set:
* first input endpoint = IR endpoint
* first output endpoint = display endpoint
*/
for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
struct usb_endpoint_descriptor *ep;
int ep_dir;
int ep_type;
ep = &iface_desc->endpoint[i].desc;
ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
if (!ir_ep_found &&
ep_dir == USB_DIR_IN &&
ep_type == USB_ENDPOINT_XFER_INT) {
rx_endpoint = ep;
ir_ep_found = 1;
dev_dbg(dev, "%s: found IR endpoint\n", __func__);
} else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
ep_type == USB_ENDPOINT_XFER_INT) {
tx_endpoint = ep;
display_ep_found = 1;
dev_dbg(dev, "%s: found display endpoint\n", __func__);
}
}
/*
* Some iMON receivers have no display. Unfortunately, it seems
* that SoundGraph recycles device IDs between devices both with
* and without... :\
*/
if (context->display == 0) {
display_ep_found = 0;
dev_dbg(dev, "%s: device has no display\n", __func__);
}
/* Input endpoint is mandatory */
if (!ir_ep_found) {
err("%s: no valid input (IR) endpoint found.", __func__);
retval = -ENODEV;
alloc_status = 2;
goto alloc_status_switch;
}
/* Determine if display requires 6 packets */
if (display_ep_found) {
if (usb_match_id(interface, vfd_proto_6p_list))
vfd_proto_6p = 1;
dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
__func__, vfd_proto_6p);
}
driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
if (!driver) {
err("%s: kzalloc failed for lirc_driver", __func__);
alloc_status = 2;
goto alloc_status_switch;
}
rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
if (!rbuf) {
err("%s: kmalloc failed for lirc_buffer", __func__);
alloc_status = 3;
goto alloc_status_switch;
}
if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
err("%s: lirc_buffer_init failed", __func__);
alloc_status = 4;
goto alloc_status_switch;
}
rx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!rx_urb) {
err("%s: usb_alloc_urb failed for IR urb", __func__);
alloc_status = 5;
goto alloc_status_switch;
}
tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!tx_urb) {
err("%s: usb_alloc_urb failed for display urb",
__func__);
alloc_status = 6;
goto alloc_status_switch;
}
mutex_init(&context->ctx_lock);
context->vfd_proto_6p = vfd_proto_6p;
strcpy(driver->name, MOD_NAME);
driver->minor = -1;
driver->code_length = sizeof(int) * 8;
driver->sample_rate = 0;
driver->features = LIRC_CAN_REC_MODE2;
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);
context->driver = driver;
/* start out in keyboard mode */
lirc_minor = lirc_register_driver(driver);
if (lirc_minor < 0) {
err("%s: lirc_register_driver failed", __func__);
alloc_status = 7;
goto unlock;
} else
dev_info(dev, "Registered iMON driver "
"(lirc minor: %d)\n", lirc_minor);
/* Needed while unregistering! */
driver->minor = lirc_minor;
context->usbdev = usbdev;
context->dev_present = 1;
context->rx_endpoint = rx_endpoint;
context->rx_urb = rx_urb;
/*
* tx is used to send characters to lcd/vfd, associate RF
* remotes, set IR protocol, and maybe more...
*/
context->tx_endpoint = tx_endpoint;
context->tx_urb = tx_urb;
if (display_ep_found)
context->display = 1;
usb_fill_int_urb(context->rx_urb, context->usbdev,
usb_rcvintpipe(context->usbdev,
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) {
err("%s: usb_submit_urb failed for intf0 (%d)",
__func__, retval);
mutex_unlock(&context->ctx_lock);
goto exit;
}
usb_set_intfdata(interface, context);
if (context->display && ifnum == 0) {
dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
__func__);
if (usb_register_dev(interface, &imon_class)) {
/* Not a fatal error, so ignore */
dev_info(dev, "%s: could not get a minor number for "
"display\n", __func__);
}
}
dev_info(dev, "iMON device (%04x:%04x, intf%d) on "
"usb<%d:%d> initialized\n", vendor, product, ifnum,
usbdev->bus->busnum, usbdev->devnum);
unlock:
mutex_unlock(&context->ctx_lock);
alloc_status_switch:
switch (alloc_status) {
case 7:
usb_free_urb(tx_urb);
case 6:
usb_free_urb(rx_urb);
case 5:
if (rbuf)
lirc_buffer_free(rbuf);
case 4:
kfree(rbuf);
case 3:
kfree(driver);
case 2:
kfree(context);
context = NULL;
case 1:
if (retval != -ENODEV)
retval = -ENOMEM;
break;
case 0:
retval = 0;
}
exit:
mutex_unlock(&driver_lock);
return retval;
}
/**
* Callback function for USB core API: disconnect
*/
static void imon_disconnect(struct usb_interface *interface)
{
struct imon_context *context;
int ifnum;
/* prevent races with ir_open()/display_open() */
mutex_lock(&driver_lock);
context = usb_get_intfdata(interface);
ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
mutex_lock(&context->ctx_lock);
usb_set_intfdata(interface, NULL);
/* Abort ongoing write */
if (atomic_read(&context->tx.busy)) {
usb_kill_urb(context->tx_urb);
complete_all(&context->tx.finished);
}
context->dev_present = 0;
usb_kill_urb(context->rx_urb);
if (context->display)
usb_deregister_dev(interface, &imon_class);
if (!context->ir_isopen && !context->dev_present) {
deregister_from_lirc(context);
mutex_unlock(&context->ctx_lock);
if (!context->display_isopen)
free_imon_context(context);
} else
mutex_unlock(&context->ctx_lock);
mutex_unlock(&driver_lock);
printk(KERN_INFO "%s: iMON device (intf%d) disconnected\n",
__func__, ifnum);
}
static int imon_suspend(struct usb_interface *intf, pm_message_t message)
{
struct imon_context *context = usb_get_intfdata(intf);
usb_kill_urb(context->rx_urb);
return 0;
}
static int imon_resume(struct usb_interface *intf)
{
int rc = 0;
struct imon_context *context = usb_get_intfdata(intf);
usb_fill_int_urb(context->rx_urb, context->usbdev,
usb_rcvintpipe(context->usbdev,
context->rx_endpoint->bEndpointAddress),
context->usb_rx_buf, sizeof(context->usb_rx_buf),
usb_rx_callback, context,
context->rx_endpoint->bInterval);
rc = usb_submit_urb(context->rx_urb, GFP_ATOMIC);
return rc;
}
static int __init imon_init(void)
{
int rc;
printk(KERN_INFO MOD_NAME ": " MOD_DESC ", v" MOD_VERSION "\n");
rc = usb_register(&imon_driver);
if (rc) {
err("%s: usb register failed(%d)", __func__, rc);
return -ENODEV;
}
return 0;
}
static void __exit imon_exit(void)
{
usb_deregister(&imon_driver);
printk(KERN_INFO MOD_NAME ": module removed. Goodbye!\n");
}
module_init(imon_init);
module_exit(imon_exit);