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    Subject[PATCH 09/15] staging/lirc: add lirc_sasem driver
    Signed-off-by: Jarod Wilson <jarod@redhat.com>
    ---
    drivers/staging/lirc/lirc_sasem.c | 933 +++++++++++++++++++++++++++++++++++++
    1 files changed, 933 insertions(+), 0 deletions(-)
    create mode 100644 drivers/staging/lirc/lirc_sasem.c

    diff --git a/drivers/staging/lirc/lirc_sasem.c b/drivers/staging/lirc/lirc_sasem.c
    new file mode 100644
    index 0000000..9e516a1
    --- /dev/null
    +++ b/drivers/staging/lirc/lirc_sasem.c
    @@ -0,0 +1,933 @@
    +/*
    + * 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
    + */
    +
    +#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 "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 cmd, unsigned long arg);
    +static int vfd_close(struct inode *inode, struct file *file);
    +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 sasem_init(void);
    +static void __exit sasem_exit(void);
    +
    +/*** 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!) */
    + struct timeval presstime;
    + char lastcode[8];
    + int codesaved;
    +};
    +
    +/* VFD file operations */
    +static struct file_operations vfd_fops = {
    + .owner = THIS_MODULE,
    + .open = &vfd_open,
    + .write = &vfd_write,
    + .unlocked_ioctl = &vfd_ioctl,
    + .release = &vfd_close,
    +};
    +
    +/* 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, S_IRUGO | S_IWUSR);
    +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);
    +
    + if (debug)
    + printk(KERN_INFO "%s: context deleted\n", __func__);
    +}
    +
    +static void deregister_from_lirc(struct sasem_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 "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) {
    + 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->vfd_isopen) {
    + err("%s: VFD port is already open", __func__);
    + retval = -EBUSY;
    + } else {
    + context->vfd_isopen = 1;
    + file->private_data = context;
    + printk(KERN_INFO "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 cmd, unsigned long arg)
    +{
    + struct sasem_context *context = NULL;
    +
    + context = (struct sasem_context *) file->private_data;
    +
    + if (!context) {
    + err("%s: no context for device", __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:
    + printk(KERN_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) {
    + err("%s: no context for device", __func__);
    + return -ENODEV;
    + }
    +
    + mutex_lock(&context->ctx_lock);
    +
    + if (!context->vfd_isopen) {
    + err("%s: VFD is not open", __func__);
    + retval = -EIO;
    + } else {
    + context->vfd_isopen = 0;
    + printk(KERN_INFO "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);
    + err("%s: error submitting urb (%d)", __func__, 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)
    + err("%s: packet tx failed (%d)", __func__, 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 *buf,
    + size_t n_bytes, loff_t *pos)
    +{
    + int i;
    + int retval = 0;
    + struct sasem_context *context;
    + int *data_buf;
    +
    + context = (struct sasem_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 Sasem device present", __func__);
    + retval = -ENODEV;
    + goto exit;
    + }
    +
    + if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
    + err("%s: invalid payload size", __func__);
    + retval = -EINVAL;
    + goto exit;
    + }
    +
    + data_buf = memdup_user(buf, n_bytes);
    + if (PTR_ERR(data_buf))
    + 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) {
    +
    + err("%s: send packet failed for packet #%d",
    + __func__, i);
    + goto exit;
    + }
    + }
    +exit:
    +
    + mutex_unlock(&context->ctx_lock);
    +
    + 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);
    +
    + return;
    +}
    +
    +/**
    + * 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 = (struct sasem_context *) data;
    +
    + mutex_lock(&context->ctx_lock);
    +
    + if (context->ir_isopen) {
    + err("%s: IR port is already open", __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)
    + err("%s: usb_submit_urb failed for ir_open (%d)",
    + __func__, retval);
    + else {
    + context->ir_isopen = 1;
    + printk(KERN_INFO "IR port opened\n");
    + }
    +
    +exit:
    + mutex_unlock(&context->ctx_lock);
    +
    + mutex_unlock(&disconnect_lock);
    + return 0;
    +}
    +
    +/**
    + * Called by lirc_dev when the application closes /dev/lirc
    + */
    +static void ir_close(void *data)
    +{
    + struct sasem_context *context;
    +
    + context = (struct sasem_context *)data;
    + if (!context) {
    + err("%s: no context for device", __func__);
    + return;
    + }
    +
    + mutex_lock(&context->ctx_lock);
    +
    + usb_kill_urb(context->rx_urb);
    + context->ir_isopen = 0;
    + printk(KERN_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);
    + return;
    +}
    +
    +/**
    + * 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;
    + long ms;
    + struct timeval tv;
    +
    + if (len != 8) {
    + printk(KERN_WARNING "%s: invalid incoming packet size (%d)\n",
    + __func__, len);
    + return;
    + }
    +
    +#ifdef DEBUG
    + int i;
    + for (i = 0; i < 8; ++i)
    + printk(KERN_INFO "%02x ", buf[i]);
    + printk(KERN_INFO "\n");
    +#endif
    +
    + /*
    + * 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 */
    + do_gettimeofday(&tv);
    + ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
    + (tv.tv_usec - context->presstime.tv_usec) / 1000;
    +
    + 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 ((ms < 250) && (context->codesaved != 0)) {
    + memcpy(buf, &context->lastcode, 8);
    + context->presstime.tv_sec = tv.tv_sec;
    + context->presstime.tv_usec = tv.tv_usec;
    + }
    + } 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.tv_sec = tv.tv_sec;
    + context->presstime.tv_usec = tv.tv_usec;
    + }
    +
    + 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:
    + printk(KERN_WARNING "%s: status (%d): ignored",
    + __func__, urb->status);
    + break;
    + }
    +
    + usb_submit_urb(context->rx_urb, GFP_ATOMIC);
    + return;
    +}
    +
    +
    +
    +/**
    + * 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;
    +
    + printk(KERN_INFO "%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;
    + 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;
    + if (debug)
    + printk(KERN_INFO "%s: found IR endpoint\n",
    + __func__);
    +
    + } else if (!vfd_ep_found &&
    + ep_dir == USB_DIR_OUT &&
    + ep_type == USB_ENDPOINT_XFER_INT) {
    +
    + tx_endpoint = ep;
    + vfd_ep_found = 1;
    + if (debug)
    + printk(KERN_INFO "%s: found VFD endpoint\n",
    + __func__);
    + }
    + }
    +
    + /* Input endpoint is mandatory */
    + if (!ir_ep_found) {
    +
    + err("%s: no valid input (IR) endpoint found.", __func__);
    + retval = -ENODEV;
    + goto exit;
    + }
    +
    + if (!vfd_ep_found)
    + printk(KERN_INFO "%s: no valid output (VFD) endpoint found.\n",
    + __func__);
    +
    +
    + /* Allocate memory */
    + alloc_status = 0;
    +
    + context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
    + if (!context) {
    + err("%s: kzalloc failed for context", __func__);
    + alloc_status = 1;
    + goto alloc_status_switch;
    + }
    + 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;
    + }
    + if (vfd_ep_found) {
    + tx_urb = usb_alloc_urb(0, GFP_KERNEL);
    + if (!tx_urb) {
    + err("%s: usb_alloc_urb failed for VFD urb",
    + __func__);
    + 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) {
    + err("%s: lirc_register_driver failed", __func__);
    + alloc_status = 7;
    + mutex_unlock(&context->ctx_lock);
    + } else
    + printk(KERN_INFO "%s: Registered Sasem driver (minor:%d)\n",
    + __func__, lirc_minor);
    +
    +alloc_status_switch:
    +
    + switch (alloc_status) {
    +
    + case 7:
    + if (vfd_ep_found)
    + usb_free_urb(tx_urb);
    + case 6:
    + usb_free_urb(rx_urb);
    + case 5:
    + lirc_buffer_free(rbuf);
    + case 4:
    + kfree(rbuf);
    + case 3:
    + kfree(driver);
    + case 2:
    + kfree(context);
    + context = NULL;
    + case 1:
    + retval = -ENOMEM;
    + goto exit;
    + }
    +
    + /* 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)
    + printk(KERN_INFO "Registering VFD with sysfs\n");
    + if (usb_register_dev(interface, &sasem_class))
    + /* Not a fatal error, so ignore */
    + printk(KERN_INFO "%s: could not get a minor number "
    + "for VFD\n", __func__);
    + }
    +
    + printk(KERN_INFO "%s: Sasem device on usb<%d:%d> initialized\n",
    + __func__, dev->bus->busnum, dev->devnum);
    +
    + mutex_unlock(&context->ctx_lock);
    +exit:
    + return retval;
    +}
    +
    +/**
    + * Callback function for USB core API: disonnect
    + */
    +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);
    +
    + printk(KERN_INFO "%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);
    +}
    +
    +static int __init sasem_init(void)
    +{
    + int rc;
    +
    + printk(KERN_INFO MOD_DESC ", v" MOD_VERSION "\n");
    + printk(KERN_INFO MOD_AUTHOR "\n");
    +
    + rc = usb_register(&sasem_driver);
    + if (rc < 0) {
    + err("%s: usb register failed (%d)", __func__, rc);
    + return -ENODEV;
    + }
    + return 0;
    +}
    +
    +static void __exit sasem_exit(void)
    +{
    + usb_deregister(&sasem_driver);
    + printk(KERN_INFO "module removed. Goodbye!\n");
    +}
    +
    +
    +module_init(sasem_init);
    +module_exit(sasem_exit);
    --
    1.7.1.1
    --
    Jarod Wilson
    jarod@redhat.com



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