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Subject[PATCH 08/18] lirc driver for the Soundgraph IMON IR Receivers
Date
Successfully tested earlier tonight, see:
https://bugzilla.redhat.com/show_bug.cgi?id=459523

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Janne Grunau <j@jannau.net>
CC: Christoph Bartelmus <lirc@bartelmus.de>
Tested-by: Tom Horsley <tom.horsley@att.net>
---
drivers/input/lirc/Kconfig | 7 +
drivers/input/lirc/Makefile | 1 +
drivers/input/lirc/lirc_imon.c | 1280 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1288 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/lirc/lirc_imon.c

diff --git a/drivers/input/lirc/Kconfig b/drivers/input/lirc/Kconfig
index 67802fe..7e37b2d 100644
--- a/drivers/input/lirc/Kconfig
+++ b/drivers/input/lirc/Kconfig
@@ -40,6 +40,13 @@ config LIRC_I2C
Driver for I2C-based IR receivers, such as those commonly
found onboard Hauppauge PVR-150/250/350 video capture cards

+config LIRC_IMON
+ tristate "Soundgraph IMON Receiver"
+ default n
+ depends on LIRC_DEV
+ help
+ Driver for the Soundgraph IMON IR Receiver
+
config LIRC_MCEUSB
tristate "Microsoft Media Center Ed. Receiver, v1"
default n
diff --git a/drivers/input/lirc/Makefile b/drivers/input/lirc/Makefile
index 86df97d..f39fa06 100644
--- a/drivers/input/lirc/Makefile
+++ b/drivers/input/lirc/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_LIRC_DEV) += lirc_dev.o
obj-$(CONFIG_LIRC_ATIUSB) += lirc_atiusb.o
obj-$(CONFIG_LIRC_CMDIR) += lirc_cmdir.o
obj-$(CONFIG_LIRC_I2C) += lirc_i2c.o
+obj-$(CONFIG_LIRC_IMON) += lirc_imon.o
obj-$(CONFIG_LIRC_MCEUSB) += lirc_mceusb.o
obj-$(CONFIG_LIRC_MCEUSB2) += lirc_mceusb2.o
obj-$(CONFIG_LIRC_SERIAL) += lirc_serial.o
diff --git a/drivers/input/lirc/lirc_imon.c b/drivers/input/lirc/lirc_imon.c
new file mode 100644
index 0000000..bdfd953
--- /dev/null
+++ b/drivers/input/lirc/lirc_imon.c
@@ -0,0 +1,1280 @@
+/*
+ * lirc_imon.c: LIRC plugin/VFD driver for Ahanix/Soundgraph IMON IR/VFD
+ *
+ * Version 0.3
+ * Supports newer iMON models that send decoded IR signals.
+ * This includes the iMON PAD model.
+ * Removed module option for vfd_proto_6p. This driver supports
+ * multiple iMON devices so it is meaningless to have
+ * a global option to set protocol variants.
+ *
+ * Version 0.2 beta 2 [January 31, 2005]
+ * USB disconnect/reconnect no longer causes problems for lircd
+ *
+ * Version 0.2 beta 1 [January 29, 2005]
+ * Added support for original iMON receiver(ext USB)
+ *
+ * Version 0.2 alpha 2 [January 24, 2005]
+ * Added support for VFDs with 6-packet protocol
+ *
+ * Version 0.2 alpha 1 [January 23, 2005]
+ * Added support for 2.6 kernels
+ * Reworked disconnect handling
+ * Incorporated Changwoo Ryu's algorithm
+ *
+ * Version 0.1 alpha 1[July 5, 2004]
+ *
+ * Copyright(C) 2004 Venky Raju(dev@venky.ws)
+ *
+ * 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/version.h>
+#include <linux/autoconf.h>
+
+#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 "lirc.h"
+#include "lirc_dev.h"
+
+
+#define MOD_AUTHOR "Venky Raju <dev@venky.ws>"
+#define MOD_DESC "Driver for Soundgraph iMON MultiMedia IR/VFD"
+#define MOD_NAME "lirc_imon"
+#define MOD_VERSION "0.3"
+
+#define VFD_MINOR_BASE 144 /* Same as LCD */
+#define DEVICE_NAME "lcd%d"
+
+#define BUF_CHUNK_SIZE 4
+#define BUF_SIZE 128
+
+#define BIT_DURATION 250 /* each bit received is 250us */
+
+#define SUCCESS 0
+#define TRUE 1
+#define FALSE 0
+
+
+/* ------------------------------------------------------------
+ * 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);
+
+/* VFD file_operations function prototypes */
+static int vfd_open(struct inode *inode, struct file *file);
+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);
+
+/* LCD file_operations override function prototypes */
+static ssize_t lcd_write(struct file *file, const char *buf,
+ size_t n_bytes, loff_t *pos);
+
+/* LIRC plugin 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
+ * ------------------------------------------------------------
+ */
+
+struct imon_context {
+ struct usb_device *dev;
+ int vfd_supported; /* not all controllers do */
+ int vfd_isopen; /* VFD port has been opened */
+ int ir_isopen; /* IR port open */
+ int ir_isassociating; /* IR port open for association */
+ int dev_present; /* USB device presence */
+ struct mutex lock; /* to lock this object */
+ wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
+
+ int vfd_proto_6p; /* VFD requires 6th packet */
+ int ir_onboard_decode; /* IR signals decoded onboard */
+
+ struct lirc_plugin *plugin;
+ struct usb_endpoint_descriptor *rx_endpoint;
+ struct usb_endpoint_descriptor *tx_endpoint;
+ struct urb *rx_urb;
+ struct urb *tx_urb;
+ int tx_control;
+ 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[35]; /* user data buffer */
+ struct completion finished; /* wait for write to finish */
+ atomic_t busy; /* write in progress */
+ int status; /* status of tx completion */
+ } tx;
+};
+
+#define LOCK_CONTEXT mutex_lock(&context->lock)
+#define UNLOCK_CONTEXT mutex_unlock(&context->lock)
+
+/* VFD file operations */
+static struct file_operations vfd_fops = {
+ .owner = THIS_MODULE,
+ .open = &vfd_open,
+ .write = &vfd_write,
+ .release = &vfd_close
+};
+
+/* USB Device ID for IMON USB Control Board */
+static struct usb_device_id imon_usb_id_table[] = {
+ /* IMON USB Control Board (IR & VFD) */
+ { USB_DEVICE(0x0aa8, 0xffda) },
+ /* IMON USB Control Board (IR only) */
+ { USB_DEVICE(0x0aa8, 0x8001) },
+ /* IMON USB Control Board (IR & VFD) */
+ { USB_DEVICE(0x15c2, 0xffda) },
+ /* IMON USB Control Board (IR & VFD) */
+ { USB_DEVICE(0x15c2, 0xffdc) },
+ /* IMON USB Control Board (IR & LCD) */
+ { USB_DEVICE(0x15c2, 0x0038) },
+ /* IMON USB Control Board (ext IR only) */
+ { USB_DEVICE(0x04e8, 0xff30) },
+ {}
+};
+
+/* Some iMON VFD models requires a 6th packet */
+static struct usb_device_id vfd_proto_6p_list[] = {
+ { USB_DEVICE(0x15c2, 0xffda) },
+ { USB_DEVICE(0x15c2, 0xffdc) },
+ { USB_DEVICE(0x15c2, 0x0038) },
+ {}
+};
+static unsigned char vfd_packet6[] = {
+ 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
+
+/* Some iMON LCD models use control endpoint */
+static struct usb_device_id lcd_control_endpoint_list[] = {
+ { USB_DEVICE(0x15c2, 0x0038) },
+ {}
+};
+
+/* Newer iMON models decode the signal onboard */
+static struct usb_device_id ir_onboard_decode_list[] = {
+ { USB_DEVICE(0x15c2, 0xffdc) },
+ { USB_DEVICE(0x15c2, 0x0038) },
+ {}
+};
+
+/* USB Device data */
+static struct usb_driver imon_driver = {
+ .name = MOD_NAME,
+ .probe = imon_probe,
+ .disconnect = imon_disconnect,
+ .id_table = imon_usb_id_table,
+};
+
+static struct usb_class_driver imon_class = {
+ .name = DEVICE_NAME,
+ .fops = &vfd_fops,
+ .minor_base = VFD_MINOR_BASE,
+};
+
+/* to prevent races between open() and disconnect() */
+static DECLARE_MUTEX(disconnect_sem);
+
+static int debug;
+
+/* lcd or vfd? */
+static int is_lcd;
+
+
+/* ------------------------------------------------------------
+ * M O D U L E C O D E
+ * ------------------------------------------------------------
+ */
+
+MODULE_AUTHOR(MOD_AUTHOR);
+MODULE_DESCRIPTION(MOD_DESC);
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
+module_param(is_lcd, int, 0);
+MODULE_PARM_DESC(is_lcd, "The device is an LCD: 0=no (it's a VFD), "
+ "1=yes (default: no)");
+
+static inline void delete_context(struct imon_context *context)
+{
+ if (context->vfd_supported)
+ usb_free_urb(context->tx_urb);
+ usb_free_urb(context->rx_urb);
+ lirc_buffer_free(context->plugin->rbuf);
+ kfree(context->plugin->rbuf);
+ kfree(context->plugin);
+ kfree(context);
+
+ if (debug)
+ info("%s: context deleted", __func__);
+}
+
+static inline void deregister_from_lirc(struct imon_context *context)
+{
+ int retval;
+ int minor = context->plugin->minor;
+
+ retval = lirc_unregister_plugin(minor);
+ if (retval)
+ err("%s: unable to deregister from lirc(%d)",
+ __func__, retval);
+ else
+ info("Deregistered iMON plugin(minor:%d)", 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 imon_context *context = NULL;
+ int subminor;
+ int retval = SUCCESS;
+
+ /* prevent races with disconnect */
+ down(&disconnect_sem);
+
+ 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;
+ }
+
+ LOCK_CONTEXT;
+
+ if (!context->vfd_supported) {
+ err("%s: VFD not supported by device", __func__);
+ retval = -ENODEV;
+ } else if (context->vfd_isopen) {
+ err("%s: VFD port is already open", __func__);
+ retval = -EBUSY;
+ } else {
+ context->vfd_isopen = TRUE;
+ file->private_data = context;
+ info("VFD port opened");
+ }
+
+ UNLOCK_CONTEXT;
+
+exit:
+ up(&disconnect_sem);
+ return retval;
+}
+
+/**
+ * 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 imon_context *context = NULL;
+ int retval = SUCCESS;
+
+ context = (struct imon_context *) file->private_data;
+
+ if (!context) {
+ err("%s: no context for device", __func__);
+ return -ENODEV;
+ }
+
+ LOCK_CONTEXT;
+
+ if (!context->vfd_supported) {
+ err("%s: VFD not supported by device", __func__);
+ retval = -ENODEV;
+ } else if (!context->vfd_isopen) {
+ err("%s: VFD is not open", __func__);
+ retval = -EIO;
+ } else {
+ context->vfd_isopen = FALSE;
+ info("VFD port closed");
+ 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. */
+ UNLOCK_CONTEXT;
+ delete_context(context);
+ return retval;
+ }
+ }
+
+ UNLOCK_CONTEXT;
+ return retval;
+}
+
+/**
+ * Sends a packet to the VFD.
+ */
+static inline int send_packet(struct imon_context *context)
+{
+ unsigned int pipe;
+ int interval = 0;
+ int retval = SUCCESS;
+ struct usb_ctrlrequest *control_req = NULL;
+
+ /* Check if we need to use control or interrupt urb */
+ if (!context->tx_control) {
+ 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;
+ } else {
+ /* fill request into kmalloc'ed space: */
+ control_req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
+ if (control_req == NULL)
+ return -ENOMEM;
+
+ /* setup packet is '21 09 0200 0001 0008' */
+ control_req->bRequestType = 0x21;
+ control_req->bRequest = 0x09;
+ control_req->wValue = cpu_to_le16(0x0002);
+ control_req->wIndex = cpu_to_le16(0x0100);
+ control_req->wLength = cpu_to_le16(0x0800);
+
+ /* control pipe is endpoint 0x00 */
+ pipe = usb_sndctrlpipe(context->dev, 0);
+
+ /* build the control urb */
+ usb_fill_control_urb(context->tx_urb, context->dev, pipe,
+ (unsigned char *)control_req,
+ context->usb_tx_buf,
+ sizeof(context->usb_tx_buf),
+ usb_tx_callback, context);
+ 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 != SUCCESS) {
+ atomic_set(&(context->tx.busy), 0);
+ err("%s: error submitting urb(%d)", __func__, retval);
+ } else {
+ /* Wait for tranmission to complete(or abort) */
+ UNLOCK_CONTEXT;
+ wait_for_completion(&context->tx.finished);
+ LOCK_CONTEXT;
+
+ retval = context->tx.status;
+ if (retval != SUCCESS)
+ err("%s: packet tx failed(%d)", __func__, retval);
+ }
+
+ kfree(control_req);
+
+ return retval;
+}
+
+/**
+ * Sends an associate packet to the iMON 2.4G.
+ *
+ * This might not be such a good idea, since it has an id
+ * collition with some versions of the "IR & VFD" combo.
+ * The only way to determine if it is a RF version is to look
+ * at the product description string.(Which we currently do
+ * not fetch).
+ */
+static inline int send_associate_24g(struct imon_context *context)
+{
+ int retval;
+ const unsigned char packet[8] = { 0x01, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x20 };
+
+ if (!context) {
+ err("%s: no context for device", __func__);
+ return -ENODEV;
+ }
+
+ LOCK_CONTEXT;
+
+ if (!context->dev_present) {
+ err("%s: no iMON device present", __func__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ memcpy(context->usb_tx_buf, packet, sizeof(packet));
+ retval = send_packet(context);
+
+exit:
+ UNLOCK_CONTEXT;
+
+ return retval;
+}
+
+/**
+ * This is the sysfs functions to handle the association og the iMON 2.4G LT.
+ *
+ *
+ */
+
+static ssize_t show_associate_remote(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct imon_context *context = dev_get_drvdata(d);
+
+ if (!context)
+ return -ENODEV;
+
+ if (context->ir_isassociating) {
+ strcpy(buf, "The device it associating press some button "
+ "on the remote.\n");
+ } else if (context->ir_isopen) {
+ strcpy(buf, "Device is open and ready to associate.\n"
+ "Echo something into this file to start "
+ "the process.\n");
+ } else {
+ strcpy(buf, "Device is closed, you need to open it to "
+ "associate the remote(you can use irw).\n");
+ }
+ return strlen(buf);
+}
+
+static ssize_t store_associate_remote(struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct imon_context *context;
+
+ context = dev_get_drvdata(d);
+
+ if (!context)
+ return -ENODEV;
+
+ if (!context->ir_isopen)
+ return -EINVAL;
+
+ if (context->ir_isopen) {
+ context->ir_isassociating = TRUE;
+ send_associate_24g(context);
+ }
+
+ return count;
+}
+
+static DEVICE_ATTR(associate_remote, S_IWUSR | S_IRUGO, show_associate_remote,
+ store_associate_remote);
+
+static struct attribute *imon_sysfs_entries[] = {
+ &dev_attr_associate_remote.attr,
+ NULL
+};
+
+static struct attribute_group imon_attribute_group = {
+ .attrs = imon_sysfs_entries
+};
+
+
+
+
+/**
+ * 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 = SUCCESS;
+ struct imon_context *context;
+
+ context = (struct imon_context *) file->private_data;
+ if (!context) {
+ err("%s: no context for device", __func__);
+ return -ENODEV;
+ }
+
+ LOCK_CONTEXT;
+
+ if (!context->dev_present) {
+ err("%s: no iMON device present", __func__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ if (n_bytes <= 0 || n_bytes > 32) {
+ err("%s: invalid payload size", __func__);
+ retval = -EINVAL;
+ goto exit;
+ }
+
+ if (copy_from_user(context->tx.data_buf, buf, n_bytes)) {
+ retval = -EFAULT;
+ goto exit;
+ }
+
+ /* Pad with spaces */
+ for (i = n_bytes; i < 32; ++i)
+ context->tx.data_buf[i] = ' ';
+
+ for (i = 32; i < 35; ++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 != SUCCESS) {
+ err("%s: send packet failed for packet #%d",
+ __func__, seq/2);
+ goto exit;
+ } else {
+ seq += 2;
+ offset += 7;
+ }
+
+ } while (offset < 35);
+
+ if (context->vfd_proto_6p) {
+ /* Send packet #6 */
+ memcpy(context->usb_tx_buf, vfd_packet6, 7);
+ context->usb_tx_buf[7] = (unsigned char) seq;
+ retval = send_packet(context);
+ if (retval != SUCCESS)
+ err("%s: send packet failed for packet #%d",
+ __func__, seq/2);
+ }
+
+exit:
+ UNLOCK_CONTEXT;
+
+ return (retval == SUCCESS) ? n_bytes : retval;
+}
+
+/**
+ * Writes data to the LCD. The iMON OEM LCD screen excepts 8-byte
+ * packets. We accept data as 16 hexadecimal digits, followed by a
+ * newline (to make it easy to drive the device from a command-line
+ * -- even though the actual binary data is a bit complicated).
+ *
+ * The device itself is not a "traditional" text-mode display. It's
+ * actually a 16x96 pixel bitmap display. That means if you want to
+ * display text, you've got to have your own "font" and translate the
+ * text into bitmaps for display. This is really flexible (you can
+ * display whatever diacritics you need, and so on), but it's also
+ * a lot more complicated than most LCDs...
+ */
+static ssize_t lcd_write(struct file *file, const char *buf,
+ size_t n_bytes, loff_t *pos)
+{
+ int retval = SUCCESS;
+ struct imon_context *context;
+
+ context = (struct imon_context *) file->private_data;
+ if (!context) {
+ err("%s: no context for device", __func__);
+ return -ENODEV;
+ }
+
+ LOCK_CONTEXT;
+
+ if (!context->dev_present) {
+ err("%s: no iMON device present", __func__);
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ if (n_bytes != 8) {
+ err("%s: invalid payload size: %d (expecting 8)",
+ __func__, (int) n_bytes);
+ retval = -EINVAL;
+ goto exit;
+ }
+
+ if (copy_from_user(context->usb_tx_buf, buf, 8)) {
+ retval = -EFAULT;
+ goto exit;
+ }
+
+ retval = send_packet(context);
+ if (retval != SUCCESS) {
+ err("%s: send packet failed!", __func__);
+ goto exit;
+ } else if (debug) {
+ info("%s: write %d bytes to LCD", __func__, (int) n_bytes);
+ }
+exit:
+ UNLOCK_CONTEXT;
+ return (retval == SUCCESS) ? 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 = SUCCESS;
+ struct imon_context *context;
+
+ /* prevent races with disconnect */
+ down(&disconnect_sem);
+
+ context = (struct imon_context *) data;
+
+ LOCK_CONTEXT;
+
+ if (context->ir_isopen) {
+ err("%s: IR port is already open", __func__);
+ retval = -EBUSY;
+ goto exit;
+ }
+
+ /* initial IR protocol decode variables */
+ context->rx.count = 0;
+ context->rx.initial_space = 1;
+ context->rx.prev_bit = 0;
+
+ 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 = TRUE;
+ info("IR port opened");
+ }
+
+exit:
+ UNLOCK_CONTEXT;
+
+ up(&disconnect_sem);
+ return SUCCESS;
+}
+
+/**
+ * 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;
+ }
+
+ LOCK_CONTEXT;
+
+ usb_kill_urb(context->rx_urb);
+ context->ir_isopen = FALSE;
+ context->ir_isassociating = FALSE;
+ info("IR port closed");
+
+ if (!context->dev_present) {
+ /* Device disconnected while IR port was
+ * still open. Plugin was not deregistered
+ * at disconnect time, so do it now. */
+ deregister_from_lirc(context);
+
+ if (!context->vfd_isopen) {
+ UNLOCK_CONTEXT;
+ delete_context(context);
+ return;
+ }
+ /* If VFD port is open, context will be deleted by vfd_close */
+ }
+
+ UNLOCK_CONTEXT;
+ return;
+}
+
+/**
+ * Convert bit count to time duration(in us) and submit
+ * the value to lirc_dev.
+ */
+static inline void submit_data(struct imon_context *context)
+{
+ unsigned char buf[4];
+ int value = context->rx.count;
+ int i;
+
+ if (debug)
+ info("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_1(context->plugin->rbuf, buf);
+ wake_up(&context->plugin->rbuf->wait_poll);
+ return;
+}
+
+/**
+ * Process the incoming packet
+ */
+static inline void incoming_packet(struct imon_context *context,
+ struct urb *urb)
+{
+ int len = urb->actual_length;
+ unsigned char *buf = urb->transfer_buffer;
+ int octet, bit;
+ unsigned char mask;
+ int chunk_num;
+#ifdef DEBUG
+ int i;
+#endif
+
+ if (len != 8) {
+ warn("%s: invalid incoming packet size(%d)",
+ __func__, len);
+ return;
+ }
+
+ /* iMON 2.4G associate frame */
+ if (buf[0] == 0x00 &&
+ buf[2] == 0xFF && /* REFID */
+ buf[3] == 0xFF &&
+ buf[4] == 0xFF &&
+ buf[5] == 0xFF && /* iMON 2.4G */
+ ((buf[6] == 0x4E && buf[7] == 0xDF) || /* LT */
+ (buf[6] == 0x5E && buf[7] == 0xDF))) { /* DT */
+ warn("%s: remote associated refid=%02X", __func__, buf[1]);
+ context->ir_isassociating = FALSE;
+ }
+
+ chunk_num = buf[7];
+
+ if (chunk_num == 0xFF)
+ return; /* filler frame, no data here */
+
+ if (buf[0] == 0xFF &&
+ buf[1] == 0xFF &&
+ buf[2] == 0xFF &&
+ buf[3] == 0xFF &&
+ buf[4] == 0xFF &&
+ buf[5] == 0xFF && /* iMON 2.4G */
+ ((buf[6] == 0x4E && buf[7] == 0xAF) || /* LT */
+ (buf[6] == 0x5E && buf[7] == 0xAF))) /* DT */
+ return; /* filler frame, no data here */
+
+#ifdef DEBUG
+ for (i = 0; i < 8; ++i)
+ printk(KERN_INFO "%02x ", buf[i]);
+ printk(KERN_INFO "\n");
+#endif
+
+ if (context->ir_onboard_decode) {
+ /* The signals have been decoded onboard the iMON controller */
+ lirc_buffer_write_1(context->plugin->rbuf, buf);
+ wake_up(&context->plugin->rbuf->wait_poll);
+ return;
+ }
+
+ /* 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 (chunk_num == 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;
+
+ if (!urb)
+ return;
+ context = (struct imon_context *) urb->context;
+ if (!context)
+ return;
+
+ switch (urb->status) {
+ case -ENOENT: /* usbcore unlink successful! */
+ return;
+ case SUCCESS:
+ if (context->ir_isopen)
+ incoming_packet(context, urb);
+ break;
+ default:
+ warn("%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 imon_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_plugin *plugin = NULL;
+ struct lirc_buffer *rbuf = NULL;
+ int lirc_minor = 0;
+ int num_endpoints;
+ int retval = SUCCESS;
+ int vfd_ep_found;
+ int ir_ep_found;
+ int alloc_status;
+ int vfd_proto_6p = FALSE;
+ int ir_onboard_decode = FALSE;
+ int tx_control = FALSE;
+ struct imon_context *context = NULL;
+ int i;
+
+ info("%s: found IMON device", __func__);
+
+ /*
+ * If it's the LCD, as opposed to the VFD, we just need to replace
+ * the "write" file op.
+ */
+ if (is_lcd)
+ vfd_fops.write = &lcd_write;
+
+ 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 = FALSE;
+ vfd_ep_found = FALSE;
+
+ 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 = TRUE;
+ if (debug)
+ info("%s: found IR endpoint", __func__);
+
+ } else if (!vfd_ep_found &&
+ ep_dir == USB_DIR_OUT &&
+ ep_type == USB_ENDPOINT_XFER_INT) {
+ tx_endpoint = ep;
+ vfd_ep_found = TRUE;
+ if (debug)
+ info("%s: found VFD endpoint", __func__);
+ }
+ }
+
+ /*
+ * If we didn't find a vfd endpoint, and we have a next-gen LCD,
+ * use control urb instead of interrupt
+ */
+ if (!vfd_ep_found) {
+ if (usb_match_id(interface, lcd_control_endpoint_list)) {
+ tx_control = 1;
+ vfd_ep_found = TRUE;
+ if (debug)
+ info("%s: LCD device uses control endpoint, "
+ "not interface OUT endpoint", __func__);
+ }
+ }
+
+ /* Input endpoint is mandatory */
+ if (!ir_ep_found) {
+ err("%s: no valid input(IR) endpoint found.", __func__);
+ retval = -ENODEV;
+ goto exit;
+ } else {
+ /* Determine if the IR signals are decoded onboard */
+ if (usb_match_id(interface, ir_onboard_decode_list))
+ ir_onboard_decode = TRUE;
+
+ if (debug)
+ info("ir_onboard_decode: %d", ir_onboard_decode);
+ }
+
+ /* Determine if VFD requires 6 packets */
+ if (vfd_ep_found) {
+ if (usb_match_id(interface, vfd_proto_6p_list))
+ vfd_proto_6p = TRUE;
+
+ if (debug)
+ info("vfd_proto_6p: %d", vfd_proto_6p);
+ }
+
+
+ /* Allocate memory */
+
+ alloc_status = SUCCESS;
+
+ context = kmalloc(sizeof(struct imon_context), GFP_KERNEL);
+ if (!context) {
+ err("%s: kmalloc failed for context", __func__);
+ alloc_status = 1;
+ goto alloc_status_switch;
+ }
+ plugin = kmalloc(sizeof(struct lirc_plugin), GFP_KERNEL);
+ if (!plugin) {
+ err("%s: kmalloc failed for lirc_plugin", __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;
+ }
+ }
+
+ /* clear all members of imon_context and lirc_plugin */
+ memset(context, 0, sizeof(struct imon_context));
+ mutex_init(&context->lock);
+ context->vfd_proto_6p = vfd_proto_6p;
+ context->ir_onboard_decode = ir_onboard_decode;
+
+ memset(plugin, 0, sizeof(struct lirc_plugin));
+
+ strcpy(plugin->name, MOD_NAME);
+ plugin->minor = -1;
+ plugin->code_length = (ir_onboard_decode) ?
+ 32 : sizeof(int) * 8;
+ plugin->sample_rate = 0;
+ plugin->features = (ir_onboard_decode) ?
+ LIRC_CAN_REC_LIRCCODE : LIRC_CAN_REC_MODE2;
+ plugin->data = context;
+ plugin->rbuf = rbuf;
+ plugin->set_use_inc = ir_open;
+ plugin->set_use_dec = ir_close;
+ plugin->dev = &dev->dev;
+ plugin->owner = THIS_MODULE;
+
+ LOCK_CONTEXT;
+
+ lirc_minor = lirc_register_plugin(plugin);
+ if (lirc_minor < 0) {
+ err("%s: lirc_register_plugin failed", __func__);
+ alloc_status = 7;
+ UNLOCK_CONTEXT;
+ goto alloc_status_switch;
+ } else
+ info("%s: Registered iMON plugin(minor:%d)",
+ __func__, lirc_minor);
+
+ /* Needed while unregistering! */
+ plugin->minor = lirc_minor;
+
+ context->dev = dev;
+ context->dev_present = TRUE;
+ context->rx_endpoint = rx_endpoint;
+ context->rx_urb = rx_urb;
+ if (vfd_ep_found) {
+ context->vfd_supported = TRUE;
+ context->tx_endpoint = tx_endpoint;
+ context->tx_urb = tx_urb;
+ context->tx_control = tx_control;
+ }
+ context->plugin = plugin;
+
+ usb_set_intfdata(interface, context);
+
+ if (cpu_to_le16(dev->descriptor.idProduct) == 0xffdc) {
+ int err;
+
+ err = sysfs_create_group(&interface->dev.kobj,
+ &imon_attribute_group);
+ if (err)
+ err("%s: Could not create sysfs entries(%d)",
+ __func__, err);
+ }
+
+ if (vfd_ep_found) {
+ if (debug)
+ info("Registering VFD with sysfs");
+ if (usb_register_dev(interface, &imon_class)) {
+ /* Not a fatal error, so ignore */
+ info("%s: could not get a minor number for VFD",
+ __func__);
+ }
+ }
+
+ info("%s: iMON device on usb<%d:%d> initialized",
+ __func__, dev->bus->busnum, dev->devnum);
+
+ UNLOCK_CONTEXT;
+
+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(plugin);
+ case 2:
+ kfree(context);
+ context = NULL;
+ case 1:
+ retval = -ENOMEM;
+ case SUCCESS:
+ ;
+ }
+
+exit:
+ return retval;
+}
+
+/**
+ * Callback function for USB core API: disonnect
+ */
+static void imon_disconnect(struct usb_interface *interface)
+{
+ struct imon_context *context;
+
+ /* prevent races with ir_open()/vfd_open() */
+ down(&disconnect_sem);
+
+ context = usb_get_intfdata(interface);
+ LOCK_CONTEXT;
+
+ info("%s: iMON device disconnected", __func__);
+
+ /* sysfs_remove_group is safe to call even if sysfs_create_group
+ * hasn't been called */
+ sysfs_remove_group(&interface->dev.kobj,
+ &imon_attribute_group);
+ usb_set_intfdata(interface, NULL);
+ context->dev_present = FALSE;
+
+ /* 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);
+
+ if (context->vfd_supported)
+ usb_deregister_dev(interface, &imon_class);
+
+ UNLOCK_CONTEXT;
+
+ if (!context->ir_isopen && !context->vfd_isopen)
+ delete_context(context);
+
+ up(&disconnect_sem);
+}
+
+static int __init imon_init(void)
+{
+ int rc;
+
+ info(MOD_DESC ", v" MOD_VERSION);
+ info(MOD_AUTHOR);
+
+ rc = usb_register(&imon_driver);
+ if (rc) {
+ err("%s: usb register failed(%d)", __func__, rc);
+ return -ENODEV;
+ }
+ return SUCCESS;
+}
+
+static void __exit imon_exit(void)
+{
+ usb_deregister(&imon_driver);
+ info("module removed. Goodbye!");
+}
+
+#ifdef MODULE
+module_init(imon_init);
+module_exit(imon_exit);
+
+#else
+subsys_initcall(imon_init);
+
+#endif /* MODULE */
--
1.6.0.1


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