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    Subject[PATCH 05/15] staging/lirc: add lirc_imon driver
    Nb: this is a very trimmed-down lirc_imon, which only supports the
    oldest generation of imon devices that don't do onboard signal decoding
    like the most recent generation imon devices -- those are now supported
    by the ir-core imon driver.

    Signed-off-by: Jarod Wilson <jarod@redhat.com>
    ---
    drivers/staging/lirc/lirc_imon.c | 1058 ++++++++++++++++++++++++++++++++++++++
    1 files changed, 1058 insertions(+), 0 deletions(-)
    create mode 100644 drivers/staging/lirc/lirc_imon.c

    diff --git a/drivers/staging/lirc/lirc_imon.c b/drivers/staging/lirc/lirc_imon.c
    new file mode 100644
    index 0000000..43856d6
    --- /dev/null
    +++ b/drivers/staging/lirc/lirc_imon.c
    @@ -0,0 +1,1058 @@
    +/*
    + * 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 struct file_operations display_fops = {
    + .owner = THIS_MODULE,
    + .open = &display_open,
    + .write = &vfd_write,
    + .release = &display_close
    +};
    +
    +/*
    + * 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 = (struct imon_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;
    + struct usb_ctrlrequest *control_req = NULL;
    +
    + /* 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);
    + }
    +
    + kfree(control_req);
    +
    + 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;
    +
    + context = (struct imon_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);
    +
    + 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, chunk_num;
    +
    + /*
    + * 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 (chunk_num == 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 alloc_status_switch;
    + } 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);
    +
    +alloc_status_switch:
    + mutex_unlock(&context->ctx_lock);
    +
    + 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);
    --
    1.7.1.1
    --
    Jarod Wilson
    jarod@redhat.com



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