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staging: frontier: remove driver 

The driver hasn't been cleaned up and it doesn't look like anyone is
working on it anymore (including the original author). So remove the
driver from the kernel. If someone wants to work on cleaning it up and
moving it out of staging, this commit can be reverted.

Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Cc: David Täht <d@teklibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kristina Martšenko 2014-07-24 01:35:00 +03:00 committed by Greg Kroah-Hartman
parent 53b903093b
commit 0d317b91d6
10 changed files with 0 additions and 1971 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
MAINTAINERS
View File

@ -8542,11 +8542,6 @@ M: Marek Belisko <marek.belisko@gmail.com>
S: Odd Fixes
F: drivers/staging/ft1000/
STAGING - FRONTIER TRANZPORT AND ALPHATRACK
M: David Täht <d@teklibre.com>
S: Odd Fixes
F: drivers/staging/frontier/
STAGING - GO7007 MPEG CODEC
M: Hans Verkuil <hans.verkuil@cisco.com>
S: Maintained

2
drivers/staging/Kconfig
View File

@ -54,8 +54,6 @@ source "drivers/staging/rtl8821ae/Kconfig"
source "drivers/staging/rts5208/Kconfig"
source "drivers/staging/frontier/Kconfig"
source "drivers/staging/phison/Kconfig"
source "drivers/staging/line6/Kconfig"

1
drivers/staging/Makefile
View File

@ -19,7 +19,6 @@ obj-$(CONFIG_R8192EE) += rtl8192ee/
obj-$(CONFIG_R8723AU) += rtl8723au/
obj-$(CONFIG_R8821AE) += rtl8821ae/
obj-$(CONFIG_RTS5208) += rts5208/
obj-$(CONFIG_TRANZPORT) += frontier/
obj-$(CONFIG_IDE_PHISON) += phison/
obj-$(CONFIG_LINE6_USB) += line6/
obj-$(CONFIG_NETLOGIC_XLR_NET) += netlogic/

5
drivers/staging/frontier/Kconfig
View File

@ -1,5 +0,0 @@
config TRANZPORT
tristate "Frontier Tranzport and Alphatrack support"
depends on USB
---help---
Enable support for the Frontier Tranzport and Alphatrack devices.

2
drivers/staging/frontier/Makefile
View File

@ -1,2 +0,0 @@
obj-$(CONFIG_TRANZPORT) += tranzport.o
obj-$(CONFIG_TRANZPORT) += alphatrack.o

47
drivers/staging/frontier/README
View File

@ -1,47 +0,0 @@
This directory contains the Linux USB Tranzport and Alphatrack Kernel drivers.
See http://www.frontierdesign.com for details on these devices.
Userspace test code is available from
git://toutatis.isc.org/home/d/src/git/frontier.git
At present the tranzport does reads/writes of 8 byte cmds to
/dev/tranzport0 to control the lights, screen, and wheel.
At present the alphatrack accepts reads/writes of 12 byte cmds to
/dev/tranzport0 to control the lights, screen, fader and touchpad.
The tranzport driver provides a rudimentary sysfs interface for the status of
the device and a writable parameter for turning wheel compression on and off.
The API is nothing more than the USB commands issued to the device. Why?
The control wheel/fader can generate events far too quickly for
a typical userspace application to keep up with them via libusb. Input
needs to be 100% accurate and fast in order for the alphatrack or tranzport
to be useful.
UIO would be useful except that usb disconnect events need
to be handled correctly.
A sysfs interface is perfect for simple userspace apps to do fun things with
the lights and screen. But it's fairly lousy for handling input events and
very lousy for watching the state of the shuttle wheel.
A linux input events interface is great for the input events and shuttle wheel.
* It's theoretically OK on LEDs.
* A fader can be mapped to an absolute mouse device.
* But there is no LCD support at all, or fader feedback support in that API
So, thus, these stubby drivers exist.
In the end this could be driven by a midi layer, which handles all those
cases via a well defined API, but - among other things - is slow, doesn't do
flow control, and is a LOT of extra work, none of which is required at
the kernel level (probably). Frankly, I'd like to keep the
core driver simple because the only realtime work really required is
the bottom half interrupt handler and the output overlapping.
Exposing some sort of clean api to userspace would be perfect. What that
API looks like? Gah. beats me.

9
drivers/staging/frontier/TODO
View File

@ -1,9 +0,0 @@
TODO:
- checkpatch.pl clean
- sparse clean
- fix userspace interface to be sane
- possibly just port to userspace with libusb
- review by the USB developer community
Please send any patches for this driver to Greg Kroah-Hartman <greg@kroah.com>
and David Taht <d@teklibre.com>.

849
drivers/staging/frontier/alphatrack.c
View File

@ -1,849 +0,0 @@
/*
* Frontier Designs Alphatrack driver
*
* Copyright (C) 2007 Michael Taht (m@taht.net)
*
* Based on the usbled driver and ldusb drivers by
*
* Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
*
* The ldusb driver was, in turn, derived from Lego USB Tower driver
* Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
* 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
*
* 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, version 2.
*
*/
/**
* This driver uses a ring buffer for time critical reading of
* interrupt in reports and provides read and write methods for
* raw interrupt reports.
*/
/*
* Note: this currently uses a dumb ringbuffer for reads and writes.
* A more optimal driver would cache and kill off outstanding urbs that are
* now invalid, and ignore ones that already were in the queue but valid
* as we only have 30 commands for the alphatrack. In particular this is
* key for getting lights to flash in time as otherwise many commands
* can be buffered up before the light change makes it to the interface.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/poll.h>
#include "alphatrack.h"
#define VENDOR_ID 0x165b
#define PRODUCT_ID 0xfad1
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define USB_ALPHATRACK_MINOR_BASE 0
#else
/* FIXME 176 - is another driver's minor - apply for that */
#define USB_ALPHATRACK_MINOR_BASE 176
#endif
/* table of devices that work with this driver */
static const struct usb_device_id usb_alphatrack_table[] = {
{USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_alphatrack_table);
MODULE_VERSION("0.41");
MODULE_AUTHOR("Mike Taht <m@taht.net>");
MODULE_DESCRIPTION("Alphatrack USB Driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface");
/* These aren't done yet */
#define SUPPRESS_EXTRA_ONLINE_EVENTS 0
#define BUFFERED_WRITES 0
#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0
#define COMPRESS_FADER_EVENTS 0
#define BUFFERED_READS 1
#define RING_BUFFER_SIZE 512
#define WRITE_BUFFER_SIZE 34
#define ALPHATRACK_USB_TIMEOUT 10
#define OUTPUT_CMD_SIZE 8
#define INPUT_CMD_SIZE 12
#define ALPHATRACK_DEBUG 0
static int debug = ALPHATRACK_DEBUG;
/* Use our own dbg macro */
#define dbg_info(dev, format, arg...) do \
{ if (debug) dev_info(dev , format , ## arg); } while (0)
#define alphatrack_ocmd_info(dev, cmd, format, arg...)
#define alphatrack_icmd_info(dev, cmd, format, arg...)
/* Module parameters */
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
/*
* All interrupt in transfers are collected in a ring buffer to
* avoid racing conditions and get better performance of the driver.
*/
static int ring_buffer_size = RING_BUFFER_SIZE;
module_param(ring_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size");
/* The write_buffer can one day contain more than one interrupt out transfer.*/
static int write_buffer_size = WRITE_BUFFER_SIZE;
module_param(write_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
/*
* Increase the interval for debugging purposes.
* or set to 1 to use the standard interval from the endpoint descriptors.
*/
static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT;
module_param(min_interrupt_in_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_in_interval,
"Minimum interrupt in interval in ms");
static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT;
module_param(min_interrupt_out_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_out_interval,
"Minimum interrupt out interval in ms");
/* Structure to hold all of our device specific stuff */
struct usb_alphatrack {
struct mutex mtx; /* locks this structure */
struct usb_interface *intf; /* save off the usb interface pointer */
int open_count; /* number of times this port has been opened */
/* make gcc happy */
struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE];
struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE];
unsigned int ring_head;
unsigned int ring_tail;
wait_queue_head_t read_wait;
wait_queue_head_t write_wait;
unsigned char *interrupt_in_buffer;
unsigned char *oldi_buffer;
struct usb_endpoint_descriptor *interrupt_in_endpoint;
struct urb *interrupt_in_urb;
int interrupt_in_interval;
size_t interrupt_in_endpoint_size;
int interrupt_in_running;
int interrupt_in_done;
char *interrupt_out_buffer;
struct usb_endpoint_descriptor *interrupt_out_endpoint;
struct urb *interrupt_out_urb;
int interrupt_out_interval;
size_t interrupt_out_endpoint_size;
int interrupt_out_busy;
atomic_t writes_pending;
int event; /* alternate interface to events */
int fader; /* 10 bits */
int lights; /* 23 bits */
unsigned char dump_state; /* 0 if disabled 1 if enabled */
unsigned char enable; /* 0 if disabled 1 if enabled */
unsigned char offline; /* if the device is out of range or asleep */
unsigned char verbose; /* be verbose in error reporting */
unsigned char last_cmd[OUTPUT_CMD_SIZE];
unsigned char screen[32];
};
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
/* forward declaration */
static struct usb_driver usb_alphatrack_driver;
/**
* usb_alphatrack_abort_transfers
* aborts transfers and frees associated data structures
*/
static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev)
{
/* shutdown transfer */
if (dev->interrupt_in_running) {
dev->interrupt_in_running = 0;
if (dev->intf)
usb_kill_urb(dev->interrupt_in_urb);
}
if (dev->interrupt_out_busy)
if (dev->intf)
usb_kill_urb(dev->interrupt_out_urb);
}
/** usb_alphatrack_delete */
static void usb_alphatrack_delete(struct usb_alphatrack *dev)
{
usb_alphatrack_abort_transfers(dev);
usb_free_urb(dev->interrupt_in_urb);
usb_free_urb(dev->interrupt_out_urb);
kfree(dev->ring_buffer);
kfree(dev->interrupt_in_buffer);
kfree(dev->interrupt_out_buffer);
kfree(dev->oldi_buffer);
kfree(dev->write_buffer);
kfree(dev);
}
/** usb_alphatrack_interrupt_in_callback */
static void usb_alphatrack_interrupt_in_callback(struct urb *urb)
{
struct usb_alphatrack *dev = urb->context;
unsigned int next_ring_head;
int retval = -1;
if (urb->status) {
if (urb->status == -ENOENT ||
urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) {
goto exit;
} else {
dbg_info(&dev->intf->dev,
"%s: nonzero status received: %d\n", __func__,
urb->status);
goto resubmit; /* maybe we can recover */
}
}
if (urb->actual_length != INPUT_CMD_SIZE) {
dev_warn(&dev->intf->dev,
"Urb length was %d bytes!! Do something intelligent\n",
urb->actual_length);
} else {
alphatrack_ocmd_info(&dev->intf->dev,
&(*dev->ring_buffer)[dev->ring_tail].cmd,
"%s", "bla");
if (memcmp
(dev->interrupt_in_buffer, dev->oldi_buffer,
INPUT_CMD_SIZE) == 0) {
goto resubmit;
}
memcpy(dev->oldi_buffer, dev->interrupt_in_buffer,
INPUT_CMD_SIZE);
#if SUPPRESS_EXTRA_OFFLINE_EVENTS
if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
goto resubmit;
if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
dev->offline = 2;
goto resubmit;
}
/* Always pass one offline event up the stack */
if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
dev->offline = 0;
if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
dev->offline = 1;
#endif
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
if (next_ring_head != dev->ring_tail) {
memcpy(&((*dev->ring_buffer)[dev->ring_head]),
dev->interrupt_in_buffer, urb->actual_length);
dev->ring_head = next_ring_head;
retval = 0;
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
} else {
dev_warn(&dev->intf->dev,
"Ring buffer overflow, %d bytes dropped\n",
urb->actual_length);
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
}
}
resubmit:
/* resubmit if we're still running */
if (dev->interrupt_in_running && dev->intf) {
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
if (retval)
dev_err(&dev->intf->dev,
"usb_submit_urb failed (%d)\n", retval);
}
exit:
dev->interrupt_in_done = 1;
wake_up_interruptible(&dev->read_wait);
}
/** usb_alphatrack_interrupt_out_callback */
static void usb_alphatrack_interrupt_out_callback(struct urb *urb)
{
struct usb_alphatrack *dev = urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status && !(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN))
dbg_info(&dev->intf->dev,
"%s - nonzero write interrupt status received: %d\n",
__func__, urb->status);
atomic_dec(&dev->writes_pending);
dev->interrupt_out_busy = 0;
wake_up_interruptible(&dev->write_wait);
}
/** usb_alphatrack_open */
static int usb_alphatrack_open(struct inode *inode, struct file *file)
{
struct usb_alphatrack *dev;
int subminor;
int retval = 0;
struct usb_interface *interface;
nonseekable_open(inode, file);
subminor = iminor(inode);
mutex_lock(&disconnect_mutex);
interface = usb_find_interface(&usb_alphatrack_driver, subminor);
if (!interface) {
pr_err("%s - error, can't find device for minor %d\n",
__func__, subminor);
retval = -ENODEV;
goto unlock_disconnect_exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto unlock_disconnect_exit;
}
/* lock this device */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto unlock_disconnect_exit;
}
/* allow opening only once */
if (dev->open_count) {
retval = -EBUSY;
goto unlock_exit;
}
dev->open_count = 1;
/* initialize in direction */
dev->ring_head = 0;
dev->ring_tail = 0;
usb_fill_int_urb(dev->interrupt_in_urb,
interface_to_usbdev(interface),
usb_rcvintpipe(interface_to_usbdev(interface),
dev->interrupt_in_endpoint->
bEndpointAddress),
dev->interrupt_in_buffer,
dev->interrupt_in_endpoint_size,
usb_alphatrack_interrupt_in_callback, dev,
dev->interrupt_in_interval);
dev->interrupt_in_running = 1;
dev->interrupt_in_done = 0;
dev->enable = 1;
dev->offline = 0;
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
if (retval) {
dev_err(&interface->dev,
"Couldn't submit interrupt_in_urb %d\n", retval);
dev->interrupt_in_running = 0;
dev->open_count = 0;
goto unlock_exit;
}
/* save device in the file's private structure */
file->private_data = dev;
unlock_exit:
mutex_unlock(&dev->mtx);
unlock_disconnect_exit:
mutex_unlock(&disconnect_mutex);
return retval;
}
/** usb_alphatrack_release */
static int usb_alphatrack_release(struct inode *inode, struct file *file)
{
struct usb_alphatrack *dev;
int retval = 0;
dev = file->private_data;
if (dev == NULL) {
retval = -ENODEV;
goto exit;
}
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
if (dev->intf == NULL) {
/* the device was unplugged before the file was released */
mutex_unlock(&dev->mtx);
/* unlock here as usb_alphatrack_delete frees dev */
usb_alphatrack_delete(dev);
retval = -ENODEV;
goto exit;
}
/* wait until write transfer is finished */
if (dev->interrupt_out_busy)
wait_event_interruptible_timeout(dev->write_wait,
!dev->interrupt_out_busy,
2 * HZ);
usb_alphatrack_abort_transfers(dev);
dev->open_count = 0;
unlock_exit:
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/** usb_alphatrack_poll */
static unsigned int usb_alphatrack_poll(struct file *file, poll_table *wait)
{
struct usb_alphatrack *dev;
unsigned int mask = 0;
dev = file->private_data;
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
if (dev->ring_head != dev->ring_tail)
mask |= POLLIN | POLLRDNORM;
if (!dev->interrupt_out_busy)
mask |= POLLOUT | POLLWRNORM;
return mask;
}
/** usb_alphatrack_read */
static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
struct usb_alphatrack *dev;
int retval = 0;
int c = 0;
dev = file->private_data;
/* verify that we actually have some data to read */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */
if (dev->intf == NULL) {
retval = -ENODEV;
pr_err("%s: No device or device unplugged %d\n",
__func__, retval);
goto unlock_exit;
}
while (dev->ring_head == dev->ring_tail) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
dev->interrupt_in_done = 0;
retval =
wait_event_interruptible(dev->read_wait,
dev->interrupt_in_done);
if (retval < 0)
goto unlock_exit;
}
alphatrack_ocmd_info(&dev->intf->dev,
&(*dev->ring_buffer)[dev->ring_tail].cmd, "%s",
": copying to userspace");
c = 0;
while ((c < count) && (dev->ring_tail != dev->ring_head)) {
if (copy_to_user
(&buffer[c], &(*dev->ring_buffer)[dev->ring_tail],
INPUT_CMD_SIZE)) {
retval = -EFAULT;
goto unlock_exit;
}
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
c += INPUT_CMD_SIZE;
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
}
retval = c;
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/** usb_alphatrack_write */
static ssize_t usb_alphatrack_write(struct file *file,
const char __user *buffer, size_t count,
loff_t *ppos)
{
struct usb_alphatrack *dev;
size_t bytes_to_write;
int retval = 0;
dev = file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */
if (dev->intf == NULL) {
retval = -ENODEV;
pr_err("%s: No device or device unplugged %d\n",
__func__, retval);
goto unlock_exit;
}
/* wait until previous transfer is finished */
if (dev->interrupt_out_busy) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
retval =
wait_event_interruptible(dev->write_wait,
!dev->interrupt_out_busy);
if (retval < 0)
goto unlock_exit;
}
/* write the data into interrupt_out_buffer from userspace */
/* FIXME - if you write more than 12 bytes this breaks */
bytes_to_write =
min(count, write_buffer_size * dev->interrupt_out_endpoint_size);
if (bytes_to_write < count)
dev_warn(&dev->intf->dev,
"Write buffer overflow, %zd bytes dropped\n",
count - bytes_to_write);
dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
__func__, count, bytes_to_write);
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
retval = -EFAULT;
goto unlock_exit;
}
if (dev->interrupt_out_endpoint == NULL) {
dev_err(&dev->intf->dev, "Endpoint should not be null!\n");
goto unlock_exit;
}
/* send off the urb */
usb_fill_int_urb(dev->interrupt_out_urb,
interface_to_usbdev(dev->intf),
usb_sndintpipe(interface_to_usbdev(dev->intf),
dev->interrupt_out_endpoint->
bEndpointAddress),
dev->interrupt_out_buffer, bytes_to_write,
usb_alphatrack_interrupt_out_callback, dev,
dev->interrupt_out_interval);
dev->interrupt_out_busy = 1;
atomic_inc(&dev->writes_pending);
wmb();
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
if (retval) {
dev->interrupt_out_busy = 0;
dev_err(&dev->intf->dev,
"Couldn't submit interrupt_out_urb %d\n", retval);
atomic_dec(&dev->writes_pending);
goto unlock_exit;
}
retval = bytes_to_write;
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/* file operations needed when we register this driver */
static const struct file_operations usb_alphatrack_fops = {
.owner = THIS_MODULE,
.read = usb_alphatrack_read,
.write = usb_alphatrack_write,
.open = usb_alphatrack_open,
.release = usb_alphatrack_release,
.poll = usb_alphatrack_poll,
.llseek = no_llseek,
};
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with the driver core
*/
static struct usb_class_driver usb_alphatrack_class = {
.name = "alphatrack%d",
.fops = &usb_alphatrack_fops,
.minor_base = USB_ALPHATRACK_MINOR_BASE,
};
/**
* usb_alphatrack_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int usb_alphatrack_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_alphatrack *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int i;
int true_size;
int retval = -ENOMEM;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL)
goto exit;
mutex_init(&dev->mtx);
dev->intf = intf;
init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait);
iface_desc = intf->cur_altsetting;
/* set up the endpoint information */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (usb_endpoint_is_int_in(endpoint))
dev->interrupt_in_endpoint = endpoint;
if (usb_endpoint_is_int_out(endpoint))
dev->interrupt_out_endpoint = endpoint;
}
if (dev->interrupt_in_endpoint == NULL) {
dev_err(&intf->dev, "Interrupt in endpoint not found\n");
goto error;
}
if (dev->interrupt_out_endpoint == NULL)
dev_warn(&intf->dev,
"Interrupt out endpoint not found (using control endpoint instead)\n");
dev->interrupt_in_endpoint_size =
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
if (dev->interrupt_in_endpoint_size != 64)
dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
if (ring_buffer_size == 0)
ring_buffer_size = RING_BUFFER_SIZE;
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
/*
* FIXME - there are more usb_alloc routines for dma correctness.
* Needed?
*/
dev->ring_buffer = kmalloc_array(true_size,
sizeof(struct alphatrack_icmd),
GFP_KERNEL);
if (!dev->ring_buffer)
goto error;
dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size,
GFP_KERNEL);
if (!dev->interrupt_in_buffer)
goto error;
dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
if (!dev->oldi_buffer)
goto error;
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_in_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
goto error;
}
dev->interrupt_out_endpoint_size =
dev->interrupt_out_endpoint ? le16_to_cpu(dev->
interrupt_out_endpoint->
wMaxPacketSize) : udev->
descriptor.bMaxPacketSize0;
if (dev->interrupt_out_endpoint_size != 64)
dev_warn(&intf->dev,
"Interrupt out endpoint size is not 64!)\n");
if (write_buffer_size == 0)
write_buffer_size = WRITE_BUFFER_SIZE;
true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
dev->interrupt_out_buffer =
kmalloc_array(true_size,
dev->interrupt_out_endpoint_size,
GFP_KERNEL);
if (!dev->interrupt_out_buffer)
goto error;
dev->write_buffer = kmalloc_array(true_size,
sizeof(struct alphatrack_ocmd),
GFP_KERNEL);
if (!dev->write_buffer)
goto error;
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
goto error;
}
dev->interrupt_in_interval =
min_interrupt_in_interval >
dev->interrupt_in_endpoint->
bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
bInterval;
if (dev->interrupt_out_endpoint)
dev->interrupt_out_interval =
min_interrupt_out_interval >
dev->interrupt_out_endpoint->
bInterval ? min_interrupt_out_interval : dev->
interrupt_out_endpoint->bInterval;
/* we can register the device now, as it is ready */
usb_set_intfdata(intf, dev);
atomic_set(&dev->writes_pending, 0);
retval = usb_register_dev(intf, &usb_alphatrack_class);
if (retval) {
/* something prevented us from registering this driver */
dev_err(&intf->dev,
"Not able to get a minor for this device.\n");
usb_set_intfdata(intf, NULL);
goto error;
}
/* let the user know what node this device is now attached to */
dev_info(&intf->dev,
"Alphatrack Device #%d now attached to major %d minor %d\n",
(intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR,
intf->minor);
exit:
return retval;
error:
usb_alphatrack_delete(dev);
return retval;
}
/**
* usb_alphatrack_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void usb_alphatrack_disconnect(struct usb_interface *intf)
{
struct usb_alphatrack *dev;
int minor;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
mutex_lock(&dev->mtx);
minor = intf->minor;
/* give back our minor */
usb_deregister_dev(intf, &usb_alphatrack_class);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
mutex_unlock(&dev->mtx);
usb_alphatrack_delete(dev);
} else {
atomic_set(&dev->writes_pending, 0);
dev->intf = NULL;
mutex_unlock(&dev->mtx);
}
mutex_unlock(&disconnect_mutex);
dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
(minor - USB_ALPHATRACK_MINOR_BASE));
}
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver usb_alphatrack_driver = {
.name = "alphatrack",
.probe = usb_alphatrack_probe,
.disconnect = usb_alphatrack_disconnect,
.id_table = usb_alphatrack_table,
};
module_usb_driver(usb_alphatrack_driver);

78
drivers/staging/frontier/alphatrack.h
View File

@ -1,78 +0,0 @@
struct alphatrack_icmd {
unsigned char cmd[12];
};
struct alphatrack_ocmd {
unsigned char cmd[8];
};
/*
* These are unused by the present driver but provide documentation for the
* userspace API.
*/
enum LightID {
LIGHT_EQ = 0,
LIGHT_OUT,
LIGHT_F2,
LIGHT_SEND,
LIGHT_IN,
LIGHT_F1,
LIGHT_PAN,
LIGHT_UNDEF1,
LIGHT_UNDEF2,
LIGHT_SHIFT,
LIGHT_TRACKMUTE,
LIGHT_TRACKSOLO,
LIGHT_TRACKREC,
LIGHT_READ,
LIGHT_WRITE,
LIGHT_ANYSOLO,
LIGHT_AUTO,
LIGHT_F4,
LIGHT_RECORD,
LIGHT_WINDOW,
LIGHT_PLUGIN,
LIGHT_F3,
LIGHT_LOOP
};
#define BUTTONMASK_BATTERY 0x00004000
#define BUTTONMASK_BACKLIGHT 0x00008000
#define BUTTONMASK_FASTFORWARD 0x04000000
#define BUTTONMASK_TRACKMUTE 0x00040000
#define BUTTONMASK_TRACKSOLO 0x00800000
#define BUTTONMASK_TRACKLEFT 0x80000000
#define BUTTONMASK_RECORD 0x02000000
#define BUTTONMASK_SHIFT 0x20000000
#define BUTTONMASK_PUNCH 0x00800000
#define BUTTONMASK_TRACKRIGHT 0x00020000
#define BUTTONMASK_REWIND 0x01000000
#define BUTTONMASK_STOP 0x10000000
#define BUTTONMASK_LOOP 0x00010000
#define BUTTONMASK_TRACKREC 0x00001000
#define BUTTONMASK_PLAY 0x08000000
#define BUTTONMASK_TOUCH1 0x00000008
#define BUTTONMASK_TOUCH2 0x00000010
#define BUTTONMASK_TOUCH3 0x00000020
#define BUTTONMASK_PRESS1 0x00000009
#define BUTTONMASK_PRESS2 0x00008010
#define BUTTONMASK_PRESS3 0x00002020
/*
* last 3 bytes are the slider position
* 40 is the actual slider moving, the most sig bits, and 3 lsb
*/
#define BUTTONMASK_FLIP 0x40000000
#define BUTTONMASK_F1 0x00100000
#define BUTTONMASK_F2 0x00400000
#define BUTTONMASK_F3 0x00200000
#define BUTTONMASK_F4 0x00080000
#define BUTTONMASK_PAN 0x00000200
#define BUTTONMASK_SEND 0x00000800
#define BUTTONMASK_EQ 0x00004000
#define BUTTONMASK_PLUGIN 0x00000400
#define BUTTONMASK_AUTO 0x00000100
/* #define BUTTONMASK_FOOTSWITCH FIXME */

973
drivers/staging/frontier/tranzport.c
View File

@ -1,973 +0,0 @@
/*
* Frontier Designs Tranzport driver
*
* Copyright (C) 2007 Michael Taht (m@taht.net)
*
* Based on the usbled driver and ldusb drivers by
*
* Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
*
* The ldusb driver was, in turn, derived from Lego USB Tower driver
* Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
* 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
*
* 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, version 2.
*
*/
/*
* This driver uses a ring buffer for time critical reading of
* interrupt in reports and provides read and write methods for
* raw interrupt reports.
*/
/* Note: this currently uses a dumb ringbuffer for reads and writes.
* A more optimal driver would cache and kill off outstanding urbs that are
* now invalid, and ignore ones that already were in the queue but valid
* as we only have 17 commands for the tranzport. In particular this is
* key for getting lights to flash in time as otherwise many commands
* can be buffered up before the light change makes it to the interface.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/poll.h>
/* Define these values to match your devices */
#define VENDOR_ID 0x165b
#define PRODUCT_ID 0x8101
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define USB_TRANZPORT_MINOR_BASE 0
#else /* FIXME 177- is the another driver's minor - apply for a minor soon */
#define USB_TRANZPORT_MINOR_BASE 177
#endif
/* table of devices that work with this driver */
static const struct usb_device_id usb_tranzport_table[] = {
{USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_tranzport_table);
MODULE_VERSION("0.35");
MODULE_AUTHOR("Mike Taht <m@taht.net>");
MODULE_DESCRIPTION("Tranzport USB Driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("Frontier Designs Tranzport Control Surface");
#define SUPPRESS_EXTRA_OFFLINE_EVENTS 1
#define COMPRESS_WHEEL_EVENTS 1
#define BUFFERED_READS 1
#define RING_BUFFER_SIZE 1000
#define WRITE_BUFFER_SIZE 34
#define TRANZPORT_USB_TIMEOUT 10
#define TRANZPORT_DEBUG 0
static int debug = TRANZPORT_DEBUG;
/* Use our own dbg macro */
#define dbg_info(dev, format, arg...) do \
{ if (debug) dev_info(dev , format , ## arg); } while (0)
/* Module parameters */
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
/*
* All interrupt in transfers are collected in a ring buffer to
* avoid racing conditions and get better performance of the driver.
*/
static int ring_buffer_size = RING_BUFFER_SIZE;
module_param(ring_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
/*
* The write_buffer can one day contain more than one interrupt out transfer.
*/
static int write_buffer_size = WRITE_BUFFER_SIZE;
module_param(write_buffer_size, int, S_IRUGO);
MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
/*
* Increase the interval for debugging purposes.
* or set to 1 to use the standard interval from the endpoint descriptors.
*/
static int min_interrupt_in_interval = TRANZPORT_USB_TIMEOUT;
module_param(min_interrupt_in_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_in_interval,
"Minimum interrupt in interval in ms");
static int min_interrupt_out_interval = TRANZPORT_USB_TIMEOUT;
module_param(min_interrupt_out_interval, int, 0);
MODULE_PARM_DESC(min_interrupt_out_interval,
"Minimum interrupt out interval in ms");
struct tranzport_cmd {
unsigned char cmd[8];
};
/* Structure to hold all of our device specific stuff */
struct usb_tranzport {
struct mutex mtx; /* locks this structure */
struct usb_interface *intf; /* save off the usb interface pointer */
int open_count; /* number of times this port opened */
struct tranzport_cmd (*ring_buffer)[RING_BUFFER_SIZE];
unsigned int ring_head;
unsigned int ring_tail;
wait_queue_head_t read_wait;
wait_queue_head_t write_wait;
unsigned char *interrupt_in_buffer;
struct usb_endpoint_descriptor *interrupt_in_endpoint;
struct urb *interrupt_in_urb;
int interrupt_in_interval;
size_t interrupt_in_endpoint_size;
int interrupt_in_running;
int interrupt_in_done;
char *interrupt_out_buffer;
struct usb_endpoint_descriptor *interrupt_out_endpoint;
struct urb *interrupt_out_urb;
int interrupt_out_interval;
size_t interrupt_out_endpoint_size;
int interrupt_out_busy;
/* Sysfs support */
unsigned char enable; /* 0 if disabled 1 if enabled */
unsigned char offline; /* if the device is out of range or asleep */
unsigned char compress_wheel; /* flag to compress wheel events */
};
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
static struct usb_driver usb_tranzport_driver;
/**
* usb_tranzport_abort_transfers
* aborts transfers and frees associated data structures
*/
static void usb_tranzport_abort_transfers(struct usb_tranzport *dev)
{
/* shutdown transfer */
if (dev->interrupt_in_running) {
dev->interrupt_in_running = 0;
if (dev->intf)
usb_kill_urb(dev->interrupt_in_urb);
}
if (dev->interrupt_out_busy)
if (dev->intf)
usb_kill_urb(dev->interrupt_out_urb);
}
#define show_int(value) \
static ssize_t value##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
return sprintf(buf, "%d\n", t->value); \
} \
static DEVICE_ATTR_RO(value)
#define show_set_int(value) \
static ssize_t value##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
return sprintf(buf, "%d\n", t->value); \
} \
static ssize_t value##_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usb_tranzport *t = usb_get_intfdata(intf); \
unsigned long temp; \
if (kstrtoul(buf, 10, &temp)) \
return -EINVAL; \
t->value = temp; \
return count; \
} \
static DEVICE_ATTR_RW(value)
show_int(enable);
show_int(offline);
show_set_int(compress_wheel);
/**
* usb_tranzport_delete
*/
static void usb_tranzport_delete(struct usb_tranzport *dev)
{
usb_tranzport_abort_transfers(dev);
if (dev->intf != NULL) {
device_remove_file(&dev->intf->dev, &dev_attr_enable);
device_remove_file(&dev->intf->dev, &dev_attr_offline);
device_remove_file(&dev->intf->dev, &dev_attr_compress_wheel);
}
/* free data structures */
usb_free_urb(dev->interrupt_in_urb);
usb_free_urb(dev->interrupt_out_urb);
kfree(dev->ring_buffer);
kfree(dev->interrupt_in_buffer);
kfree(dev->interrupt_out_buffer);
kfree(dev);
}
/**
* usb_tranzport_interrupt_in_callback
*/
static void usb_tranzport_interrupt_in_callback(struct urb *urb)
{
struct usb_tranzport *dev = urb->context;
unsigned int next_ring_head;
int retval = -1;
if (urb->status) {
if (urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN) {
goto exit;
} else {
dbg_info(&dev->intf->dev,
"%s: nonzero status received: %d\n",
__func__, urb->status);
goto resubmit; /* maybe we can recover */
}
}
if (urb->actual_length != 8) {
dev_warn(&dev->intf->dev,
"Urb length was %d bytes!! Do something intelligent\n",
urb->actual_length);
} else {
dbg_info(&dev->intf->dev,
"%s: received: %02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__, dev->interrupt_in_buffer[0],
dev->interrupt_in_buffer[1],
dev->interrupt_in_buffer[2],
dev->interrupt_in_buffer[3],
dev->interrupt_in_buffer[4],
dev->interrupt_in_buffer[5],
dev->interrupt_in_buffer[6],
dev->interrupt_in_buffer[7]);
#if SUPPRESS_EXTRA_OFFLINE_EVENTS
if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
goto resubmit;
if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
dev->offline = 2;
goto resubmit;
}
/* Always pass one offline event up the stack */
if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
dev->offline = 0;
if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
dev->offline = 1;
#endif /* SUPPRESS_EXTRA_OFFLINE_EVENTS */
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
if (next_ring_head != dev->ring_tail) {
memcpy(&((*dev->ring_buffer)[dev->ring_head]),
dev->interrupt_in_buffer, urb->actual_length);
dev->ring_head = next_ring_head;
retval = 0;
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
} else {
dev_warn(&dev->intf->dev,
"Ring buffer overflow, %d bytes dropped\n",
urb->actual_length);
memset(dev->interrupt_in_buffer, 0, urb->actual_length);
}
}
resubmit:
/* resubmit if we're still running */
if (dev->interrupt_in_running && dev->intf) {
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
if (retval)
dev_err(&dev->intf->dev,
"usb_submit_urb failed (%d)\n", retval);
}
exit:
dev->interrupt_in_done = 1;
wake_up_interruptible(&dev->read_wait);
}
/**
* usb_tranzport_interrupt_out_callback
*/
static void usb_tranzport_interrupt_out_callback(struct urb *urb)
{
struct usb_tranzport *dev = urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status && !(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN))
dbg_info(&dev->intf->dev,
"%s - nonzero write interrupt status received: %d\n",
__func__, urb->status);
dev->interrupt_out_busy = 0;
wake_up_interruptible(&dev->write_wait);
}
/**
* usb_tranzport_open
*/
static int usb_tranzport_open(struct inode *inode, struct file *file)
{
struct usb_tranzport *dev;
int subminor;
int retval = 0;
struct usb_interface *interface;
nonseekable_open(inode, file);
subminor = iminor(inode);
mutex_lock(&disconnect_mutex);
interface = usb_find_interface(&usb_tranzport_driver, subminor);
if (!interface) {
pr_err("%s - error, can't find device for minor %d\n",
__func__, subminor);
retval = -ENODEV;
goto unlock_disconnect_exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto unlock_disconnect_exit;
}
/* lock this device */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto unlock_disconnect_exit;
}
/* allow opening only once */
if (dev->open_count) {
retval = -EBUSY;
goto unlock_exit;
}
dev->open_count = 1;
/* initialize in direction */
dev->ring_head = 0;
dev->ring_tail = 0;
usb_fill_int_urb(dev->interrupt_in_urb,
interface_to_usbdev(interface),
usb_rcvintpipe(interface_to_usbdev(interface),
dev->interrupt_in_endpoint->
bEndpointAddress),
dev->interrupt_in_buffer,
dev->interrupt_in_endpoint_size,
usb_tranzport_interrupt_in_callback, dev,
dev->interrupt_in_interval);
dev->interrupt_in_running = 1;
dev->interrupt_in_done = 0;
dev->enable = 1;
dev->offline = 0;
dev->compress_wheel = 1;
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
if (retval) {
dev_err(&interface->dev,
"Couldn't submit interrupt_in_urb %d\n", retval);
dev->interrupt_in_running = 0;
dev->open_count = 0;
goto unlock_exit;
}
/* save device in the file's private structure */
file->private_data = dev;
unlock_exit:
mutex_unlock(&dev->mtx);
unlock_disconnect_exit:
mutex_unlock(&disconnect_mutex);
return retval;
}
/**
* usb_tranzport_release
*/
static int usb_tranzport_release(struct inode *inode, struct file *file)
{
struct usb_tranzport *dev;
int retval = 0;
dev = file->private_data;
if (dev == NULL) {
retval = -ENODEV;
goto exit;
}
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
if (dev->intf == NULL) {
/* the device was unplugged before the file was released */
mutex_unlock(&dev->mtx);
/* unlock here as usb_tranzport_delete frees dev */
usb_tranzport_delete(dev);
retval = -ENODEV;
goto exit;
}
/* wait until write transfer is finished */
if (dev->interrupt_out_busy)
wait_event_interruptible_timeout(dev->write_wait,
!dev->interrupt_out_busy,
2 * HZ);
usb_tranzport_abort_transfers(dev);
dev->open_count = 0;
unlock_exit:
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/**
* usb_tranzport_poll
*/
static unsigned int usb_tranzport_poll(struct file *file, poll_table *wait)
{
struct usb_tranzport *dev;
unsigned int mask = 0;
dev = file->private_data;
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
if (dev->ring_head != dev->ring_tail)
mask |= POLLIN | POLLRDNORM;
if (!dev->interrupt_out_busy)
mask |= POLLOUT | POLLWRNORM;
return mask;
}
/**
* usb_tranzport_read
*/
static ssize_t usb_tranzport_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
struct usb_tranzport *dev;
int retval = 0;
#if BUFFERED_READS
int c = 0;
#endif
#if COMPRESS_WHEEL_EVENTS
signed char oldwheel;
signed char newwheel;
int cancompress = 1;
int next_tail;
#endif
/* do I have such a thing as a null event? */
dev = file->private_data;
/* verify that we actually have some data to read */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */
if (dev->intf == NULL) {
retval = -ENODEV;
pr_err("%s: No device or device unplugged %d\n",
__func__, retval);
goto unlock_exit;
}
while (dev->ring_head == dev->ring_tail) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
/* tiny race - FIXME: make atomic? */
/* atomic_cmp_exchange(&dev->interrupt_in_done,0,0); */
dev->interrupt_in_done = 0;
retval = wait_event_interruptible(dev->read_wait,
dev->interrupt_in_done);
if (retval < 0)
goto unlock_exit;
}
dbg_info(&dev->intf->dev,
"%s: copying to userspace: %02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].cmd[0],
(*dev->ring_buffer)[dev->ring_tail].cmd[1],
(*dev->ring_buffer)[dev->ring_tail].cmd[2],
(*dev->ring_buffer)[dev->ring_tail].cmd[3],
(*dev->ring_buffer)[dev->ring_tail].cmd[4],
(*dev->ring_buffer)[dev->ring_tail].cmd[5],
(*dev->ring_buffer)[dev->ring_tail].cmd[6],
(*dev->ring_buffer)[dev->ring_tail].cmd[7]);
#if BUFFERED_READS
c = 0;
while ((c < count) && (dev->ring_tail != dev->ring_head)) {
#if COMPRESS_WHEEL_EVENTS
next_tail = (dev->ring_tail+1) % ring_buffer_size;
if (dev->compress_wheel)
cancompress = 1;
while (dev->ring_head != next_tail && cancompress == 1) {
newwheel = (*dev->ring_buffer)[next_tail].cmd[6];
oldwheel = (*dev->ring_buffer)[dev->ring_tail].cmd[6];
/* if both are wheel events, and
* no buttons have changes (FIXME, do I have to check?),
* and we are the same sign, we can compress +- 7F
*/
dbg_info(&dev->intf->dev,
"%s: trying to compress: %02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].cmd[0],
(*dev->ring_buffer)[dev->ring_tail].cmd[1],
(*dev->ring_buffer)[dev->ring_tail].cmd[2],
(*dev->ring_buffer)[dev->ring_tail].cmd[3],
(*dev->ring_buffer)[dev->ring_tail].cmd[4],
(*dev->ring_buffer)[dev->ring_tail].cmd[5],
(*dev->ring_buffer)[dev->ring_tail].cmd[6],
(*dev->ring_buffer)[dev->ring_tail].cmd[7]);
if (((*dev->ring_buffer)[dev->ring_tail].cmd[6] != 0 &&
(*dev->ring_buffer)[next_tail].cmd[6] != 0) &&
((newwheel > 0 && oldwheel > 0) ||
(newwheel < 0 && oldwheel < 0)) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[2] ==
(*dev->ring_buffer)[next_tail].cmd[2]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[3] ==
(*dev->ring_buffer)[next_tail].cmd[3]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[4] ==
(*dev->ring_buffer)[next_tail].cmd[4]) &&
((*dev->ring_buffer)[dev->ring_tail].cmd[5] ==
(*dev->ring_buffer)[next_tail].cmd[5])) {
dbg_info(&dev->intf->dev,
"%s: should compress: "
"%02x%02x%02x%02x%02x%02x%02x%02x\n",
__func__,
(*dev->ring_buffer)[dev->ring_tail].
cmd[0],
(*dev->ring_buffer)[dev->ring_tail].
cmd[1],
(*dev->ring_buffer)[dev->ring_tail].
cmd[2],
(*dev->ring_buffer)[dev->ring_tail].
cmd[3],
(*dev->ring_buffer)[dev->ring_tail].
cmd[4],
(*dev->ring_buffer)[dev->ring_tail].
cmd[5],
(*dev->ring_buffer)[dev->ring_tail].
cmd[6],
(*dev->ring_buffer)[dev->ring_tail].
cmd[7]);
newwheel += oldwheel;
if (oldwheel > 0 && !(newwheel > 0)) {
newwheel = 0x7f;
cancompress = 0;
}
if (oldwheel < 0 && !(newwheel < 0)) {
newwheel = 0x80;
cancompress = 0;
}
(*dev->ring_buffer)[next_tail].cmd[6] =
newwheel;
dev->ring_tail = next_tail;
next_tail =
(dev->ring_tail + 1) % ring_buffer_size;
} else {
cancompress = 0;
}
}
#endif /* COMPRESS_WHEEL_EVENTS */
if (copy_to_user(
&buffer[c],
&(*dev->ring_buffer)[dev->ring_tail], 8)) {
retval = -EFAULT;
goto unlock_exit;
}
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
c += 8;
dbg_info(&dev->intf->dev,
"%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
}
retval = c;
#else
/* if (copy_to_user(buffer, &(*dev->ring_buffer)[dev->ring_tail], 8)) { */
retval = -EFAULT;
goto unlock_exit;
}
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
__func__, dev->ring_head, dev->ring_tail);
retval = 8;
#endif /* BUFFERED_READS */
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/**
* usb_tranzport_write
*/
static ssize_t usb_tranzport_write(struct file *file,
const char __user *buffer, size_t count,
loff_t *ppos)
{
struct usb_tranzport *dev;
size_t bytes_to_write;
int retval = 0;
dev = file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
goto exit;
/* lock this object */
if (mutex_lock_interruptible(&dev->mtx)) {
retval = -ERESTARTSYS;
goto exit;
}
/* verify that the device wasn't unplugged */
if (dev->intf == NULL) {
retval = -ENODEV;
pr_err("%s: No device or device unplugged %d\n",
__func__, retval);
goto unlock_exit;
}
/* wait until previous transfer is finished */
if (dev->interrupt_out_busy) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto unlock_exit;
}
retval = wait_event_interruptible(dev->write_wait,
!dev->interrupt_out_busy);
if (retval < 0)
goto unlock_exit;
}
/* write the data into interrupt_out_buffer from userspace */
bytes_to_write = min(count,
write_buffer_size *
dev->interrupt_out_endpoint_size);
if (bytes_to_write < count)
dev_warn(&dev->intf->dev,
"Write buffer overflow, %zd bytes dropped\n",
count - bytes_to_write);
dbg_info(&dev->intf->dev,
"%s: count = %zd, bytes_to_write = %zd\n", __func__,
count, bytes_to_write);
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
retval = -EFAULT;
goto unlock_exit;
}
if (dev->interrupt_out_endpoint == NULL) {
dev_err(&dev->intf->dev, "Endpoint should not be null!\n");
goto unlock_exit;
}
/* send off the urb */
usb_fill_int_urb(dev->interrupt_out_urb,
interface_to_usbdev(dev->intf),
usb_sndintpipe(interface_to_usbdev(dev->intf),
dev->interrupt_out_endpoint->
bEndpointAddress),
dev->interrupt_out_buffer, bytes_to_write,
usb_tranzport_interrupt_out_callback, dev,
dev->interrupt_out_interval);
dev->interrupt_out_busy = 1;
wmb();
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
if (retval) {
dev->interrupt_out_busy = 0;
dev_err(&dev->intf->dev,
"Couldn't submit interrupt_out_urb %d\n", retval);
goto unlock_exit;
}
retval = bytes_to_write;
unlock_exit:
/* unlock the device */
mutex_unlock(&dev->mtx);
exit:
return retval;
}
/* file operations needed when we register this driver */
static const struct file_operations usb_tranzport_fops = {
.owner = THIS_MODULE,
.read = usb_tranzport_read,
.write = usb_tranzport_write,
.open = usb_tranzport_open,
.release = usb_tranzport_release,
.poll = usb_tranzport_poll,
.llseek = no_llseek,
};
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with the driver core
*/
static struct usb_class_driver usb_tranzport_class = {
.name = "tranzport%d",
.fops = &usb_tranzport_fops,
.minor_base = USB_TRANZPORT_MINOR_BASE,
};
/**
* usb_tranzport_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int usb_tranzport_probe(struct usb_interface *intf,
const struct usb_device_id *id) {
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_tranzport *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int i;
int true_size;
int retval = -ENOMEM;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL)
goto exit;
mutex_init(&dev->mtx);
dev->intf = intf;
init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait);
iface_desc = intf->cur_altsetting;
/* set up the endpoint information */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (usb_endpoint_is_int_in(endpoint))
dev->interrupt_in_endpoint = endpoint;
if (usb_endpoint_is_int_out(endpoint))
dev->interrupt_out_endpoint = endpoint;
}
if (dev->interrupt_in_endpoint == NULL) {
dev_err(&intf->dev, "Interrupt in endpoint not found\n");
goto error;
}
if (dev->interrupt_out_endpoint == NULL)
dev_warn(&intf->dev,
"Interrupt out endpoint not found (using control endpoint instead)\n");
dev->interrupt_in_endpoint_size =
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
if (dev->interrupt_in_endpoint_size != 8)
dev_warn(&intf->dev, "Interrupt in endpoint size is not 8!\n");
if (ring_buffer_size == 0)
ring_buffer_size = RING_BUFFER_SIZE;
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
/*
* FIXME - there are more usb_alloc routines for dma correctness.
* Needed?
*/
dev->ring_buffer =
kmalloc((true_size * sizeof(struct tranzport_cmd)) + 8, GFP_KERNEL);
if (!dev->ring_buffer)
goto error;
dev->interrupt_in_buffer =
kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
if (!dev->interrupt_in_buffer)
goto error;
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_in_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
goto error;
}
dev->interrupt_out_endpoint_size =
dev->interrupt_out_endpoint ?
le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
udev->descriptor.bMaxPacketSize0;
if (dev->interrupt_out_endpoint_size != 8)
dev_warn(&intf->dev,
"Interrupt out endpoint size is not 8!)\n");
dev->interrupt_out_buffer =
kmalloc_array(write_buffer_size,
dev->interrupt_out_endpoint_size, GFP_KERNEL);
if (!dev->interrupt_out_buffer)
goto error;
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
goto error;
}
dev->interrupt_in_interval =
min_interrupt_in_interval >
dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval
: dev->interrupt_in_endpoint->bInterval;
if (dev->interrupt_out_endpoint) {
dev->interrupt_out_interval =
min_interrupt_out_interval >
dev->interrupt_out_endpoint->bInterval ?
min_interrupt_out_interval :
dev->interrupt_out_endpoint->bInterval;
}
/* we can register the device now, as it is ready */
usb_set_intfdata(intf, dev);
retval = usb_register_dev(intf, &usb_tranzport_class);
if (retval) {
/* something prevented us from registering this driver */
dev_err(&intf->dev,
"Not able to get a minor for this device.\n");
usb_set_intfdata(intf, NULL);
goto error;
}
retval = device_create_file(&intf->dev, &dev_attr_compress_wheel);
if (retval)
goto error;
retval = device_create_file(&intf->dev, &dev_attr_enable);
if (retval)
goto error;
retval = device_create_file(&intf->dev, &dev_attr_offline);
if (retval)
goto error;
/* let the user know what node this device is now attached to */
dev_info(&intf->dev,
"Tranzport Device #%d now attached to major %d minor %d\n",
(intf->minor - USB_TRANZPORT_MINOR_BASE), USB_MAJOR,
intf->minor);
exit:
return retval;
error:
usb_tranzport_delete(dev);
return retval;
}
/**
* usb_tranzport_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void usb_tranzport_disconnect(struct usb_interface *intf)
{
struct usb_tranzport *dev;
int minor;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
mutex_lock(&dev->mtx);
minor = intf->minor;
/* give back our minor */
usb_deregister_dev(intf, &usb_tranzport_class);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
mutex_unlock(&dev->mtx);
usb_tranzport_delete(dev);
} else {
dev->intf = NULL;
mutex_unlock(&dev->mtx);
}
mutex_unlock(&disconnect_mutex);
dev_info(&intf->dev, "Tranzport Surface #%d now disconnected\n",
(minor - USB_TRANZPORT_MINOR_BASE));
}
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver usb_tranzport_driver = {
.name = "tranzport",
.probe = usb_tranzport_probe,
.disconnect = usb_tranzport_disconnect,
.id_table = usb_tranzport_table,
};
module_usb_driver(usb_tranzport_driver);