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OpenCloudOS-Kernel/drivers/usb/misc/ftdi-elan.c

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/*
* USB FTDI client driver for Elan Digital Systems's Uxxx adapters
*
* Copyright(C) 2006 Elan Digital Systems Limited
* http://www.elandigitalsystems.com
*
* Author and Maintainer - Tony Olech - Elan Digital Systems
* tony.olech@elandigitalsystems.com
*
* 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 was written by Tony Olech(tony.olech@elandigitalsystems.com)
* based on various USB client drivers in the 2.6.15 linux kernel
* with constant reference to the 3rd Edition of Linux Device Drivers
* published by O'Reilly
*
* The U132 adapter is a USB to CardBus adapter specifically designed
* for PC cards that contain an OHCI host controller. Typical PC cards
* are the Orange Mobile 3G Option GlobeTrotter Fusion card.
*
* The U132 adapter will *NOT *work with PC cards that do not contain
* an OHCI controller. A simple way to test whether a PC card has an
* OHCI controller as an interface is to insert the PC card directly
* into a laptop(or desktop) with a CardBus slot and if "lspci" shows
* a new USB controller and "lsusb -v" shows a new OHCI Host Controller
* then there is a good chance that the U132 adapter will support the
* PC card.(you also need the specific client driver for the PC card)
*
* Please inform the Author and Maintainer about any PC cards that
* contain OHCI Host Controller and work when directly connected to
* an embedded CardBus slot but do not work when they are connected
* via an ELAN U132 adapter.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/ioctl.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
MODULE_AUTHOR("Tony Olech");
MODULE_DESCRIPTION("FTDI ELAN driver");
MODULE_LICENSE("GPL");
#define INT_MODULE_PARM(n, v) static int n = v;module_param(n, int, 0444)
static bool distrust_firmware = 1;
module_param(distrust_firmware, bool, 0);
MODULE_PARM_DESC(distrust_firmware,
"true to distrust firmware power/overcurrent setup");
extern struct platform_driver u132_platform_driver;
static struct workqueue_struct *status_queue;
static struct workqueue_struct *command_queue;
static struct workqueue_struct *respond_queue;
/*
* ftdi_module_lock exists to protect access to global variables
*
*/
static struct mutex ftdi_module_lock;
static int ftdi_instances = 0;
static struct list_head ftdi_static_list;
/*
* end of the global variables protected by ftdi_module_lock
*/
#include "usb_u132.h"
#include <asm/io.h>
#include <linux/usb/hcd.h>
/* FIXME ohci.h is ONLY for internal use by the OHCI driver.
* If you're going to try stuff like this, you need to split
* out shareable stuff (register declarations?) into its own
* file, maybe name <linux/usb/ohci.h>
*/
#include "../host/ohci.h"
/* Define these values to match your devices*/
#define USB_FTDI_ELAN_VENDOR_ID 0x0403
#define USB_FTDI_ELAN_PRODUCT_ID 0xd6ea
/* table of devices that work with this driver*/
static const struct usb_device_id ftdi_elan_table[] = {
{USB_DEVICE(USB_FTDI_ELAN_VENDOR_ID, USB_FTDI_ELAN_PRODUCT_ID)},
{ /* Terminating entry */ }
};
MODULE_DEVICE_TABLE(usb, ftdi_elan_table);
/* only the jtag(firmware upgrade device) interface requires
* a device file and corresponding minor number, but the
* interface is created unconditionally - I suppose it could
* be configured or not according to a module parameter.
* But since we(now) require one interface per device,
* and since it unlikely that a normal installation would
* require more than a couple of elan-ftdi devices, 8 seems
* like a reasonable limit to have here, and if someone
* really requires more than 8 devices, then they can frig the
* code and recompile
*/
#define USB_FTDI_ELAN_MINOR_BASE 192
#define COMMAND_BITS 5
#define COMMAND_SIZE (1<<COMMAND_BITS)
#define COMMAND_MASK (COMMAND_SIZE-1)
struct u132_command {
u8 header;
u16 length;
u8 address;
u8 width;
u32 value;
int follows;
void *buffer;
};
#define RESPOND_BITS 5
#define RESPOND_SIZE (1<<RESPOND_BITS)
#define RESPOND_MASK (RESPOND_SIZE-1)
struct u132_respond {
u8 header;
u8 address;
u32 *value;
int *result;
struct completion wait_completion;
};
struct u132_target {
void *endp;
struct urb *urb;
int toggle_bits;
int error_count;
int condition_code;
int repeat_number;
int halted;
int skipped;
int actual;
int non_null;
int active;
int abandoning;
void (*callback)(void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code,
int repeat_number, int halted, int skipped, int actual,
int non_null);
};
/* Structure to hold all of our device specific stuff*/
struct usb_ftdi {
struct list_head ftdi_list;
struct mutex u132_lock;
int command_next;
int command_head;
struct u132_command command[COMMAND_SIZE];
int respond_next;
int respond_head;
struct u132_respond respond[RESPOND_SIZE];
struct u132_target target[4];
char device_name[16];
unsigned synchronized:1;
unsigned enumerated:1;
unsigned registered:1;
unsigned initialized:1;
unsigned card_ejected:1;
int function;
int sequence_num;
int disconnected;
int gone_away;
int stuck_status;
int status_queue_delay;
struct semaphore sw_lock;
struct usb_device *udev;
struct usb_interface *interface;
struct usb_class_driver *class;
struct delayed_work status_work;
struct delayed_work command_work;
struct delayed_work respond_work;
struct u132_platform_data platform_data;
struct resource resources[0];
struct platform_device platform_dev;
unsigned char *bulk_in_buffer;
size_t bulk_in_size;
size_t bulk_in_last;
size_t bulk_in_left;
__u8 bulk_in_endpointAddr;
__u8 bulk_out_endpointAddr;
struct kref kref;
u32 controlreg;
u8 response[4 + 1024];
int expected;
int received;
int ed_found;
};
#define kref_to_usb_ftdi(d) container_of(d, struct usb_ftdi, kref)
#define platform_device_to_usb_ftdi(d) container_of(d, struct usb_ftdi, \
platform_dev)
static struct usb_driver ftdi_elan_driver;
static void ftdi_elan_delete(struct kref *kref)
{
struct usb_ftdi *ftdi = kref_to_usb_ftdi(kref);
dev_warn(&ftdi->udev->dev, "FREEING ftdi=%p\n", ftdi);
usb_put_dev(ftdi->udev);
ftdi->disconnected += 1;
mutex_lock(&ftdi_module_lock);
list_del_init(&ftdi->ftdi_list);
ftdi_instances -= 1;
mutex_unlock(&ftdi_module_lock);
kfree(ftdi->bulk_in_buffer);
ftdi->bulk_in_buffer = NULL;
}
static void ftdi_elan_put_kref(struct usb_ftdi *ftdi)
{
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_elan_get_kref(struct usb_ftdi *ftdi)
{
kref_get(&ftdi->kref);
}
static void ftdi_elan_init_kref(struct usb_ftdi *ftdi)
{
kref_init(&ftdi->kref);
}
static void ftdi_status_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
if (!queue_delayed_work(status_queue, &ftdi->status_work, delta))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_status_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
if (queue_delayed_work(status_queue, &ftdi->status_work, delta))
kref_get(&ftdi->kref);
}
static void ftdi_status_cancel_work(struct usb_ftdi *ftdi)
{
if (cancel_delayed_work(&ftdi->status_work))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_command_requeue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
if (!queue_delayed_work(command_queue, &ftdi->command_work, delta))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_command_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
if (queue_delayed_work(command_queue, &ftdi->command_work, delta))
kref_get(&ftdi->kref);
}
static void ftdi_command_cancel_work(struct usb_ftdi *ftdi)
{
if (cancel_delayed_work(&ftdi->command_work))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_response_requeue_work(struct usb_ftdi *ftdi,
unsigned int delta)
{
if (!queue_delayed_work(respond_queue, &ftdi->respond_work, delta))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
static void ftdi_respond_queue_work(struct usb_ftdi *ftdi, unsigned int delta)
{
if (queue_delayed_work(respond_queue, &ftdi->respond_work, delta))
kref_get(&ftdi->kref);
}
static void ftdi_response_cancel_work(struct usb_ftdi *ftdi)
{
if (cancel_delayed_work(&ftdi->respond_work))
kref_put(&ftdi->kref, ftdi_elan_delete);
}
void ftdi_elan_gone_away(struct platform_device *pdev)
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
ftdi->gone_away += 1;
ftdi_elan_put_kref(ftdi);
}
EXPORT_SYMBOL_GPL(ftdi_elan_gone_away);
static void ftdi_release_platform_dev(struct device *dev)
{
dev->parent = NULL;
}
static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
struct u132_target *target, u8 *buffer, int length);
static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi);
static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi);
static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi);
static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi);
static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi);
static int ftdi_elan_synchronize(struct usb_ftdi *ftdi);
static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi);
static int ftdi_elan_command_engine(struct usb_ftdi *ftdi);
static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi);
static int ftdi_elan_hcd_init(struct usb_ftdi *ftdi)
{
int result;
if (ftdi->platform_dev.dev.parent)
return -EBUSY;
ftdi_elan_get_kref(ftdi);
ftdi->platform_data.potpg = 100;
ftdi->platform_data.reset = NULL;
ftdi->platform_dev.id = ftdi->sequence_num;
ftdi->platform_dev.resource = ftdi->resources;
ftdi->platform_dev.num_resources = ARRAY_SIZE(ftdi->resources);
ftdi->platform_dev.dev.platform_data = &ftdi->platform_data;
ftdi->platform_dev.dev.parent = NULL;
ftdi->platform_dev.dev.release = ftdi_release_platform_dev;
ftdi->platform_dev.dev.dma_mask = NULL;
snprintf(ftdi->device_name, sizeof(ftdi->device_name), "u132_hcd");
ftdi->platform_dev.name = ftdi->device_name;
dev_info(&ftdi->udev->dev, "requesting module '%s'\n", "u132_hcd");
request_module("u132_hcd");
dev_info(&ftdi->udev->dev, "registering '%s'\n",
ftdi->platform_dev.name);
result = platform_device_register(&ftdi->platform_dev);
return result;
}
static void ftdi_elan_abandon_completions(struct usb_ftdi *ftdi)
{
mutex_lock(&ftdi->u132_lock);
while (ftdi->respond_next > ftdi->respond_head) {
struct u132_respond *respond = &ftdi->respond[RESPOND_MASK &
ftdi->respond_head++];
*respond->result = -ESHUTDOWN;
*respond->value = 0;
complete(&respond->wait_completion);
} mutex_unlock(&ftdi->u132_lock);
}
static void ftdi_elan_abandon_targets(struct usb_ftdi *ftdi)
{
int ed_number = 4;
mutex_lock(&ftdi->u132_lock);
while (ed_number-- > 0) {
struct u132_target *target = &ftdi->target[ed_number];
if (target->active == 1) {
target->condition_code = TD_DEVNOTRESP;
mutex_unlock(&ftdi->u132_lock);
ftdi_elan_do_callback(ftdi, target, NULL, 0);
mutex_lock(&ftdi->u132_lock);
}
}
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
mutex_unlock(&ftdi->u132_lock);
}
static void ftdi_elan_flush_targets(struct usb_ftdi *ftdi)
{
int ed_number = 4;
mutex_lock(&ftdi->u132_lock);
while (ed_number-- > 0) {
struct u132_target *target = &ftdi->target[ed_number];
target->abandoning = 1;
wait_1:if (target->active == 1) {
int command_size = ftdi->command_next -
ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x80 | (ed_number << 5) | 0x4;
command->length = 0x00;
command->address = 0x00;
command->width = 0x00;
command->follows = 0;
command->value = 0;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
mutex_lock(&ftdi->u132_lock);
goto wait_1;
}
}
wait_2:if (target->active == 1) {
int command_size = ftdi->command_next -
ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x90 | (ed_number << 5);
command->length = 0x00;
command->address = 0x00;
command->width = 0x00;
command->follows = 0;
command->value = 0;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
mutex_lock(&ftdi->u132_lock);
goto wait_2;
}
}
}
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
mutex_unlock(&ftdi->u132_lock);
}
static void ftdi_elan_cancel_targets(struct usb_ftdi *ftdi)
{
int ed_number = 4;
mutex_lock(&ftdi->u132_lock);
while (ed_number-- > 0) {
struct u132_target *target = &ftdi->target[ed_number];
target->abandoning = 1;
wait:if (target->active == 1) {
int command_size = ftdi->command_next -
ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x80 | (ed_number << 5) | 0x4;
command->length = 0x00;
command->address = 0x00;
command->width = 0x00;
command->follows = 0;
command->value = 0;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
mutex_lock(&ftdi->u132_lock);
goto wait;
}
}
}
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
mutex_unlock(&ftdi->u132_lock);
}
static void ftdi_elan_kick_command_queue(struct usb_ftdi *ftdi)
{
ftdi_command_queue_work(ftdi, 0);
}
static void ftdi_elan_command_work(struct work_struct *work)
{
struct usb_ftdi *ftdi =
container_of(work, struct usb_ftdi, command_work.work);
if (ftdi->disconnected > 0) {
ftdi_elan_put_kref(ftdi);
return;
} else {
int retval = ftdi_elan_command_engine(ftdi);
if (retval == -ESHUTDOWN) {
ftdi->disconnected += 1;
} else if (retval == -ENODEV) {
ftdi->disconnected += 1;
} else if (retval)
dev_err(&ftdi->udev->dev, "command error %d\n", retval);
ftdi_command_requeue_work(ftdi, msecs_to_jiffies(10));
return;
}
}
static void ftdi_elan_kick_respond_queue(struct usb_ftdi *ftdi)
{
ftdi_respond_queue_work(ftdi, 0);
}
static void ftdi_elan_respond_work(struct work_struct *work)
{
struct usb_ftdi *ftdi =
container_of(work, struct usb_ftdi, respond_work.work);
if (ftdi->disconnected > 0) {
ftdi_elan_put_kref(ftdi);
return;
} else {
int retval = ftdi_elan_respond_engine(ftdi);
if (retval == 0) {
} else if (retval == -ESHUTDOWN) {
ftdi->disconnected += 1;
} else if (retval == -ENODEV) {
ftdi->disconnected += 1;
} else if (retval == -EILSEQ) {
ftdi->disconnected += 1;
} else {
ftdi->disconnected += 1;
dev_err(&ftdi->udev->dev, "respond error %d\n", retval);
}
if (ftdi->disconnected > 0) {
ftdi_elan_abandon_completions(ftdi);
ftdi_elan_abandon_targets(ftdi);
}
ftdi_response_requeue_work(ftdi, msecs_to_jiffies(10));
return;
}
}
/*
* the sw_lock is initially held and will be freed
* after the FTDI has been synchronized
*
*/
static void ftdi_elan_status_work(struct work_struct *work)
{
struct usb_ftdi *ftdi =
container_of(work, struct usb_ftdi, status_work.work);
int work_delay_in_msec = 0;
if (ftdi->disconnected > 0) {
ftdi_elan_put_kref(ftdi);
return;
} else if (ftdi->synchronized == 0) {
down(&ftdi->sw_lock);
if (ftdi_elan_synchronize(ftdi) == 0) {
ftdi->synchronized = 1;
ftdi_command_queue_work(ftdi, 1);
ftdi_respond_queue_work(ftdi, 1);
up(&ftdi->sw_lock);
work_delay_in_msec = 100;
} else {
dev_err(&ftdi->udev->dev, "synchronize failed\n");
up(&ftdi->sw_lock);
work_delay_in_msec = 10 *1000;
}
} else if (ftdi->stuck_status > 0) {
if (ftdi_elan_stuck_waiting(ftdi) == 0) {
ftdi->stuck_status = 0;
ftdi->synchronized = 0;
} else if ((ftdi->stuck_status++ % 60) == 1) {
dev_err(&ftdi->udev->dev, "WRONG type of card inserted - please remove\n");
} else
dev_err(&ftdi->udev->dev, "WRONG type of card inserted - checked %d times\n",
ftdi->stuck_status);
work_delay_in_msec = 100;
} else if (ftdi->enumerated == 0) {
if (ftdi_elan_enumeratePCI(ftdi) == 0) {
ftdi->enumerated = 1;
work_delay_in_msec = 250;
} else
work_delay_in_msec = 1000;
} else if (ftdi->initialized == 0) {
if (ftdi_elan_setupOHCI(ftdi) == 0) {
ftdi->initialized = 1;
work_delay_in_msec = 500;
} else {
dev_err(&ftdi->udev->dev, "initialized failed - trying again in 10 seconds\n");
work_delay_in_msec = 1 *1000;
}
} else if (ftdi->registered == 0) {
work_delay_in_msec = 10;
if (ftdi_elan_hcd_init(ftdi) == 0) {
ftdi->registered = 1;
} else
dev_err(&ftdi->udev->dev, "register failed\n");
work_delay_in_msec = 250;
} else {
if (ftdi_elan_checkingPCI(ftdi) == 0) {
work_delay_in_msec = 250;
} else if (ftdi->controlreg & 0x00400000) {
if (ftdi->gone_away > 0) {
dev_err(&ftdi->udev->dev, "PCI device eject confirmed platform_dev.dev.parent=%p platform_dev.dev=%p\n",
ftdi->platform_dev.dev.parent,
&ftdi->platform_dev.dev);
platform_device_unregister(&ftdi->platform_dev);
ftdi->platform_dev.dev.parent = NULL;
ftdi->registered = 0;
ftdi->enumerated = 0;
ftdi->card_ejected = 0;
ftdi->initialized = 0;
ftdi->gone_away = 0;
} else
ftdi_elan_flush_targets(ftdi);
work_delay_in_msec = 250;
} else {
dev_err(&ftdi->udev->dev, "PCI device has disappeared\n");
ftdi_elan_cancel_targets(ftdi);
work_delay_in_msec = 500;
ftdi->enumerated = 0;
ftdi->initialized = 0;
}
}
if (ftdi->disconnected > 0) {
ftdi_elan_put_kref(ftdi);
return;
} else {
ftdi_status_requeue_work(ftdi,
msecs_to_jiffies(work_delay_in_msec));
return;
}
}
/*
* file_operations for the jtag interface
*
* the usage count for the device is incremented on open()
* and decremented on release()
*/
static int ftdi_elan_open(struct inode *inode, struct file *file)
{
int subminor;
struct usb_interface *interface;
subminor = iminor(inode);
interface = usb_find_interface(&ftdi_elan_driver, subminor);
if (!interface) {
pr_err("can't find device for minor %d\n", subminor);
return -ENODEV;
} else {
struct usb_ftdi *ftdi = usb_get_intfdata(interface);
if (!ftdi) {
return -ENODEV;
} else {
if (down_interruptible(&ftdi->sw_lock)) {
return -EINTR;
} else {
ftdi_elan_get_kref(ftdi);
file->private_data = ftdi;
return 0;
}
}
}
}
static int ftdi_elan_release(struct inode *inode, struct file *file)
{
struct usb_ftdi *ftdi = file->private_data;
if (ftdi == NULL)
return -ENODEV;
up(&ftdi->sw_lock); /* decrement the count on our device */
ftdi_elan_put_kref(ftdi);
return 0;
}
/*
*
* blocking bulk reads are used to get data from the device
*
*/
static ssize_t ftdi_elan_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
char data[30 *3 + 4];
char *d = data;
int m = (sizeof(data) - 1) / 3;
int bytes_read = 0;
int retry_on_empty = 10;
int retry_on_timeout = 5;
struct usb_ftdi *ftdi = file->private_data;
if (ftdi->disconnected > 0) {
return -ENODEV;
}
data[0] = 0;
have:if (ftdi->bulk_in_left > 0) {
if (count-- > 0) {
char *p = ++ftdi->bulk_in_last + ftdi->bulk_in_buffer;
ftdi->bulk_in_left -= 1;
if (bytes_read < m) {
d += sprintf(d, " %02X", 0x000000FF & *p);
} else if (bytes_read > m) {
} else
d += sprintf(d, " ..");
if (copy_to_user(buffer++, p, 1)) {
return -EFAULT;
} else {
bytes_read += 1;
goto have;
}
} else
return bytes_read;
}
more:if (count > 0) {
int packet_bytes = 0;
int retval = usb_bulk_msg(ftdi->udev,
usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
ftdi->bulk_in_buffer, ftdi->bulk_in_size,
&packet_bytes, 50);
if (packet_bytes > 2) {
ftdi->bulk_in_left = packet_bytes - 2;
ftdi->bulk_in_last = 1;
goto have;
} else if (retval == -ETIMEDOUT) {
if (retry_on_timeout-- > 0) {
goto more;
} else if (bytes_read > 0) {
return bytes_read;
} else
return retval;
} else if (retval == 0) {
if (retry_on_empty-- > 0) {
goto more;
} else
return bytes_read;
} else
return retval;
} else
return bytes_read;
}
static void ftdi_elan_write_bulk_callback(struct urb *urb)
{
struct usb_ftdi *ftdi = urb->context;
int status = urb->status;
if (status && !(status == -ENOENT || status == -ECONNRESET ||
status == -ESHUTDOWN)) {
dev_err(&ftdi->udev->dev,
"urb=%p write bulk status received: %d\n", urb, status);
}
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
}
static int fill_buffer_with_all_queued_commands(struct usb_ftdi *ftdi,
char *buf, int command_size, int total_size)
{
int ed_commands = 0;
int b = 0;
int I = command_size;
int i = ftdi->command_head;
while (I-- > 0) {
struct u132_command *command = &ftdi->command[COMMAND_MASK &
i++];
int F = command->follows;
u8 *f = command->buffer;
if (command->header & 0x80) {
ed_commands |= 1 << (0x3 & (command->header >> 5));
}
buf[b++] = command->header;
buf[b++] = (command->length >> 0) & 0x00FF;
buf[b++] = (command->length >> 8) & 0x00FF;
buf[b++] = command->address;
buf[b++] = command->width;
while (F-- > 0) {
buf[b++] = *f++;
}
}
return ed_commands;
}
static int ftdi_elan_total_command_size(struct usb_ftdi *ftdi, int command_size)
{
int total_size = 0;
int I = command_size;
int i = ftdi->command_head;
while (I-- > 0) {
struct u132_command *command = &ftdi->command[COMMAND_MASK &
i++];
total_size += 5 + command->follows;
} return total_size;
}
static int ftdi_elan_command_engine(struct usb_ftdi *ftdi)
{
int retval;
char *buf;
int ed_commands;
int total_size;
struct urb *urb;
int command_size = ftdi->command_next - ftdi->command_head;
if (command_size == 0)
return 0;
total_size = ftdi_elan_total_command_size(ftdi, command_size);
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
dev_err(&ftdi->udev->dev, "could not get a urb to write %d commands totaling %d bytes to the Uxxx\n",
command_size, total_size);
return -ENOMEM;
}
buf = usb_alloc_coherent(ftdi->udev, total_size, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
dev_err(&ftdi->udev->dev, "could not get a buffer to write %d commands totaling %d bytes to the Uxxx\n",
command_size, total_size);
usb_free_urb(urb);
return -ENOMEM;
}
ed_commands = fill_buffer_with_all_queued_commands(ftdi, buf,
command_size, total_size);
usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
ftdi->bulk_out_endpointAddr), buf, total_size,
ftdi_elan_write_bulk_callback, ftdi);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
if (ed_commands) {
char diag[40 *3 + 4];
char *d = diag;
int m = total_size;
u8 *c = buf;
int s = (sizeof(diag) - 1) / 3;
diag[0] = 0;
while (s-- > 0 && m-- > 0) {
if (s > 0 || m == 0) {
d += sprintf(d, " %02X", *c++);
} else
d += sprintf(d, " ..");
}
}
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
dev_err(&ftdi->udev->dev, "failed %d to submit urb %p to write %d commands totaling %d bytes to the Uxxx\n",
retval, urb, command_size, total_size);
usb_free_coherent(ftdi->udev, total_size, buf, urb->transfer_dma);
usb_free_urb(urb);
return retval;
}
usb_free_urb(urb); /* release our reference to this urb,
the USB core will eventually free it entirely */
ftdi->command_head += command_size;
ftdi_elan_kick_respond_queue(ftdi);
return 0;
}
static void ftdi_elan_do_callback(struct usb_ftdi *ftdi,
struct u132_target *target, u8 *buffer, int length)
{
struct urb *urb = target->urb;
int halted = target->halted;
int skipped = target->skipped;
int actual = target->actual;
int non_null = target->non_null;
int toggle_bits = target->toggle_bits;
int error_count = target->error_count;
int condition_code = target->condition_code;
int repeat_number = target->repeat_number;
void (*callback) (void *, struct urb *, u8 *, int, int, int, int, int,
int, int, int, int) = target->callback;
target->active -= 1;
target->callback = NULL;
(*callback) (target->endp, urb, buffer, length, toggle_bits,
error_count, condition_code, repeat_number, halted, skipped,
actual, non_null);
}
static char *have_ed_set_response(struct usb_ftdi *ftdi,
struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
char *b)
{
int payload = (ed_length >> 0) & 0x07FF;
mutex_lock(&ftdi->u132_lock);
target->actual = 0;
target->non_null = (ed_length >> 15) & 0x0001;
target->repeat_number = (ed_length >> 11) & 0x000F;
if (ed_type == 0x02) {
if (payload == 0 || target->abandoning > 0) {
target->abandoning = 0;
mutex_unlock(&ftdi->u132_lock);
ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
payload);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
return ftdi->response;
} else {
ftdi->expected = 4 + payload;
ftdi->ed_found = 1;
mutex_unlock(&ftdi->u132_lock);
return b;
}
} else if (ed_type == 0x03) {
if (payload == 0 || target->abandoning > 0) {
target->abandoning = 0;
mutex_unlock(&ftdi->u132_lock);
ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
payload);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
return ftdi->response;
} else {
ftdi->expected = 4 + payload;
ftdi->ed_found = 1;
mutex_unlock(&ftdi->u132_lock);
return b;
}
} else if (ed_type == 0x01) {
target->abandoning = 0;
mutex_unlock(&ftdi->u132_lock);
ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
payload);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
return ftdi->response;
} else {
target->abandoning = 0;
mutex_unlock(&ftdi->u132_lock);
ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
payload);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
return ftdi->response;
}
}
static char *have_ed_get_response(struct usb_ftdi *ftdi,
struct u132_target *target, u16 ed_length, int ed_number, int ed_type,
char *b)
{
mutex_lock(&ftdi->u132_lock);
target->condition_code = TD_DEVNOTRESP;
target->actual = (ed_length >> 0) & 0x01FF;
target->non_null = (ed_length >> 15) & 0x0001;
target->repeat_number = (ed_length >> 11) & 0x000F;
mutex_unlock(&ftdi->u132_lock);
if (target->active)
ftdi_elan_do_callback(ftdi, target, NULL, 0);
target->abandoning = 0;
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
return ftdi->response;
}
/*
* The engine tries to empty the FTDI fifo
*
* all responses found in the fifo data are dispatched thus
* the response buffer can only ever hold a maximum sized
* response from the Uxxx.
*
*/
static int ftdi_elan_respond_engine(struct usb_ftdi *ftdi)
{
u8 *b = ftdi->response + ftdi->received;
int bytes_read = 0;
int retry_on_empty = 1;
int retry_on_timeout = 3;
int empty_packets = 0;
read:{
int packet_bytes = 0;
int retval = usb_bulk_msg(ftdi->udev,
usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
ftdi->bulk_in_buffer, ftdi->bulk_in_size,
&packet_bytes, 500);
char diag[30 *3 + 4];
char *d = diag;
int m = packet_bytes;
u8 *c = ftdi->bulk_in_buffer;
int s = (sizeof(diag) - 1) / 3;
diag[0] = 0;
while (s-- > 0 && m-- > 0) {
if (s > 0 || m == 0) {
d += sprintf(d, " %02X", *c++);
} else
d += sprintf(d, " ..");
}
if (packet_bytes > 2) {
ftdi->bulk_in_left = packet_bytes - 2;
ftdi->bulk_in_last = 1;
goto have;
} else if (retval == -ETIMEDOUT) {
if (retry_on_timeout-- > 0) {
dev_err(&ftdi->udev->dev, "TIMED OUT with packet_bytes = %d with total %d bytes%s\n",
packet_bytes, bytes_read, diag);
goto more;
} else if (bytes_read > 0) {
dev_err(&ftdi->udev->dev, "ONLY %d bytes%s\n",
bytes_read, diag);
return -ENOMEM;
} else {
dev_err(&ftdi->udev->dev, "TIMED OUT with packet_bytes = %d with total %d bytes%s\n",
packet_bytes, bytes_read, diag);
return -ENOMEM;
}
} else if (retval == -EILSEQ) {
dev_err(&ftdi->udev->dev, "error = %d with packet_bytes = %d with total %d bytes%s\n",
retval, packet_bytes, bytes_read, diag);
return retval;
} else if (retval) {
dev_err(&ftdi->udev->dev, "error = %d with packet_bytes = %d with total %d bytes%s\n",
retval, packet_bytes, bytes_read, diag);
return retval;
} else if (packet_bytes == 2) {
unsigned char s0 = ftdi->bulk_in_buffer[0];
unsigned char s1 = ftdi->bulk_in_buffer[1];
empty_packets += 1;
if (s0 == 0x31 && s1 == 0x60) {
if (retry_on_empty-- > 0) {
goto more;
} else
return 0;
} else if (s0 == 0x31 && s1 == 0x00) {
if (retry_on_empty-- > 0) {
goto more;
} else
return 0;
} else {
if (retry_on_empty-- > 0) {
goto more;
} else
return 0;
}
} else if (packet_bytes == 1) {
if (retry_on_empty-- > 0) {
goto more;
} else
return 0;
} else {
if (retry_on_empty-- > 0) {
goto more;
} else
return 0;
}
}
more:{
goto read;
}
have:if (ftdi->bulk_in_left > 0) {
u8 c = ftdi->bulk_in_buffer[++ftdi->bulk_in_last];
bytes_read += 1;
ftdi->bulk_in_left -= 1;
if (ftdi->received == 0 && c == 0xFF) {
goto have;
} else
*b++ = c;
if (++ftdi->received < ftdi->expected) {
goto have;
} else if (ftdi->ed_found) {
int ed_number = (ftdi->response[0] >> 5) & 0x03;
u16 ed_length = (ftdi->response[2] << 8) |
ftdi->response[1];
struct u132_target *target = &ftdi->target[ed_number];
int payload = (ed_length >> 0) & 0x07FF;
char diag[30 *3 + 4];
char *d = diag;
int m = payload;
u8 *c = 4 + ftdi->response;
int s = (sizeof(diag) - 1) / 3;
diag[0] = 0;
while (s-- > 0 && m-- > 0) {
if (s > 0 || m == 0) {
d += sprintf(d, " %02X", *c++);
} else
d += sprintf(d, " ..");
}
ftdi_elan_do_callback(ftdi, target, 4 + ftdi->response,
payload);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
b = ftdi->response;
goto have;
} else if (ftdi->expected == 8) {
u8 buscmd;
int respond_head = ftdi->respond_head++;
struct u132_respond *respond = &ftdi->respond[
RESPOND_MASK & respond_head];
u32 data = ftdi->response[7];
data <<= 8;
data |= ftdi->response[6];
data <<= 8;
data |= ftdi->response[5];
data <<= 8;
data |= ftdi->response[4];
*respond->value = data;
*respond->result = 0;
complete(&respond->wait_completion);
ftdi->received = 0;
ftdi->expected = 4;
ftdi->ed_found = 0;
b = ftdi->response;
buscmd = (ftdi->response[0] >> 0) & 0x0F;
if (buscmd == 0x00) {
} else if (buscmd == 0x02) {
} else if (buscmd == 0x06) {
} else if (buscmd == 0x0A) {
} else
dev_err(&ftdi->udev->dev, "Uxxx unknown(%0X) value = %08X\n",
buscmd, data);
goto have;
} else {
if ((ftdi->response[0] & 0x80) == 0x00) {
ftdi->expected = 8;
goto have;
} else {
int ed_number = (ftdi->response[0] >> 5) & 0x03;
int ed_type = (ftdi->response[0] >> 0) & 0x03;
u16 ed_length = (ftdi->response[2] << 8) |
ftdi->response[1];
struct u132_target *target = &ftdi->target[
ed_number];
target->halted = (ftdi->response[0] >> 3) &
0x01;
target->skipped = (ftdi->response[0] >> 2) &
0x01;
target->toggle_bits = (ftdi->response[3] >> 6)
& 0x03;
target->error_count = (ftdi->response[3] >> 4)
& 0x03;
target->condition_code = (ftdi->response[
3] >> 0) & 0x0F;
if ((ftdi->response[0] & 0x10) == 0x00) {
b = have_ed_set_response(ftdi, target,
ed_length, ed_number, ed_type,
b);
goto have;
} else {
b = have_ed_get_response(ftdi, target,
ed_length, ed_number, ed_type,
b);
goto have;
}
}
}
} else
goto more;
}
/*
* create a urb, and a buffer for it, and copy the data to the urb
*
*/
static ssize_t ftdi_elan_write(struct file *file,
const char __user *user_buffer, size_t count,
loff_t *ppos)
{
int retval = 0;
struct urb *urb;
char *buf;
struct usb_ftdi *ftdi = file->private_data;
if (ftdi->disconnected > 0) {
return -ENODEV;
}
if (count == 0) {
goto exit;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
retval = -ENOMEM;
goto error_1;
}
buf = usb_alloc_coherent(ftdi->udev, count, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
retval = -ENOMEM;
goto error_2;
}
if (copy_from_user(buf, user_buffer, count)) {
retval = -EFAULT;
goto error_3;
}
usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
ftdi->bulk_out_endpointAddr), buf, count,
ftdi_elan_write_bulk_callback, ftdi);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
dev_err(&ftdi->udev->dev,
"failed submitting write urb, error %d\n", retval);
goto error_3;
}
usb_free_urb(urb);
exit:
return count;
error_3:
usb_free_coherent(ftdi->udev, count, buf, urb->transfer_dma);
error_2:
usb_free_urb(urb);
error_1:
return retval;
}
static const struct file_operations ftdi_elan_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = ftdi_elan_read,
.write = ftdi_elan_write,
.open = ftdi_elan_open,
.release = ftdi_elan_release,
};
/*
* 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 ftdi_elan_jtag_class = {
.name = "ftdi-%d-jtag",
.fops = &ftdi_elan_fops,
.minor_base = USB_FTDI_ELAN_MINOR_BASE,
};
/*
* the following definitions are for the
* ELAN FPGA state machgine processor that
* lies on the other side of the FTDI chip
*/
#define cPCIu132rd 0x0
#define cPCIu132wr 0x1
#define cPCIiord 0x2
#define cPCIiowr 0x3
#define cPCImemrd 0x6
#define cPCImemwr 0x7
#define cPCIcfgrd 0xA
#define cPCIcfgwr 0xB
#define cPCInull 0xF
#define cU132cmd_status 0x0
#define cU132flash 0x1
#define cPIDsetup 0x0
#define cPIDout 0x1
#define cPIDin 0x2
#define cPIDinonce 0x3
#define cCCnoerror 0x0
#define cCCcrc 0x1
#define cCCbitstuff 0x2
#define cCCtoggle 0x3
#define cCCstall 0x4
#define cCCnoresp 0x5
#define cCCbadpid1 0x6
#define cCCbadpid2 0x7
#define cCCdataoverrun 0x8
#define cCCdataunderrun 0x9
#define cCCbuffoverrun 0xC
#define cCCbuffunderrun 0xD
#define cCCnotaccessed 0xF
static int ftdi_elan_write_reg(struct usb_ftdi *ftdi, u32 data)
{
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x00 | cPCIu132wr;
command->length = 0x04;
command->address = 0x00;
command->width = 0x00;
command->follows = 4;
command->value = data;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
static int ftdi_elan_write_config(struct usb_ftdi *ftdi, int config_offset,
u8 width, u32 data)
{
u8 addressofs = config_offset / 4;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x00 | (cPCIcfgwr & 0x0F);
command->length = 0x04;
command->address = addressofs;
command->width = 0x00 | (width & 0x0F);
command->follows = 4;
command->value = data;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
static int ftdi_elan_write_pcimem(struct usb_ftdi *ftdi, int mem_offset,
u8 width, u32 data)
{
u8 addressofs = mem_offset / 4;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x00 | (cPCImemwr & 0x0F);
command->length = 0x04;
command->address = addressofs;
command->width = 0x00 | (width & 0x0F);
command->follows = 4;
command->value = data;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_write_pcimem(struct platform_device *pdev, int mem_offset,
u8 width, u32 data)
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_write_pcimem(ftdi, mem_offset, width, data);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_write_pcimem);
static int ftdi_elan_read_reg(struct usb_ftdi *ftdi, u32 *data)
{
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
int respond_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
respond_size = ftdi->respond_next - ftdi->respond_head;
if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
{
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
struct u132_respond *respond = &ftdi->respond[
RESPOND_MASK & ftdi->respond_next];
int result = -ENODEV;
respond->result = &result;
respond->header = command->header = 0x00 | cPCIu132rd;
command->length = 0x04;
respond->address = command->address = cU132cmd_status;
command->width = 0x00;
command->follows = 0;
command->value = 0;
command->buffer = NULL;
respond->value = data;
init_completion(&respond->wait_completion);
ftdi->command_next += 1;
ftdi->respond_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
wait_for_completion(&respond->wait_completion);
return result;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
static int ftdi_elan_read_config(struct usb_ftdi *ftdi, int config_offset,
u8 width, u32 *data)
{
u8 addressofs = config_offset / 4;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
int respond_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
respond_size = ftdi->respond_next - ftdi->respond_head;
if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
{
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
struct u132_respond *respond = &ftdi->respond[
RESPOND_MASK & ftdi->respond_next];
int result = -ENODEV;
respond->result = &result;
respond->header = command->header = 0x00 | (cPCIcfgrd &
0x0F);
command->length = 0x04;
respond->address = command->address = addressofs;
command->width = 0x00 | (width & 0x0F);
command->follows = 0;
command->value = 0;
command->buffer = NULL;
respond->value = data;
init_completion(&respond->wait_completion);
ftdi->command_next += 1;
ftdi->respond_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
wait_for_completion(&respond->wait_completion);
return result;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
static int ftdi_elan_read_pcimem(struct usb_ftdi *ftdi, int mem_offset,
u8 width, u32 *data)
{
u8 addressofs = mem_offset / 4;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else {
int command_size;
int respond_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
respond_size = ftdi->respond_next - ftdi->respond_head;
if (command_size < COMMAND_SIZE && respond_size < RESPOND_SIZE)
{
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
struct u132_respond *respond = &ftdi->respond[
RESPOND_MASK & ftdi->respond_next];
int result = -ENODEV;
respond->result = &result;
respond->header = command->header = 0x00 | (cPCImemrd &
0x0F);
command->length = 0x04;
respond->address = command->address = addressofs;
command->width = 0x00 | (width & 0x0F);
command->follows = 0;
command->value = 0;
command->buffer = NULL;
respond->value = data;
init_completion(&respond->wait_completion);
ftdi->command_next += 1;
ftdi->respond_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
wait_for_completion(&respond->wait_completion);
return result;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_read_pcimem(struct platform_device *pdev, int mem_offset,
u8 width, u32 *data)
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
if (ftdi->initialized == 0) {
return -ENODEV;
} else
return ftdi_elan_read_pcimem(ftdi, mem_offset, width, data);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_read_pcimem);
static int ftdi_elan_edset_setup(struct usb_ftdi *ftdi, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
u8 ed = ed_number - 1;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_target *target = &ftdi->target[ed];
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x80 | (ed << 5);
command->length = 0x8007;
command->address = (toggle_bits << 6) | (ep_number << 2)
| (address << 0);
command->width = usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe));
command->follows = 8;
command->value = 0;
command->buffer = urb->setup_packet;
target->callback = callback;
target->endp = endp;
target->urb = urb;
target->active = 1;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_edset_setup(struct platform_device *pdev, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_setup(ftdi, ed_number, endp, urb, address,
ep_number, toggle_bits, callback);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_setup);
static int ftdi_elan_edset_input(struct usb_ftdi *ftdi, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
u8 ed = ed_number - 1;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_target *target = &ftdi->target[ed];
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
u32 remaining_length = urb->transfer_buffer_length -
urb->actual_length;
command->header = 0x82 | (ed << 5);
if (remaining_length == 0) {
command->length = 0x0000;
} else if (remaining_length > 1024) {
command->length = 0x8000 | 1023;
} else
command->length = 0x8000 | (remaining_length -
1);
command->address = (toggle_bits << 6) | (ep_number << 2)
| (address << 0);
command->width = usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe));
command->follows = 0;
command->value = 0;
command->buffer = NULL;
target->callback = callback;
target->endp = endp;
target->urb = urb;
target->active = 1;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_edset_input(struct platform_device *pdev, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_input(ftdi, ed_number, endp, urb, address,
ep_number, toggle_bits, callback);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_input);
static int ftdi_elan_edset_empty(struct usb_ftdi *ftdi, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
u8 ed = ed_number - 1;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_target *target = &ftdi->target[ed];
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x81 | (ed << 5);
command->length = 0x0000;
command->address = (toggle_bits << 6) | (ep_number << 2)
| (address << 0);
command->width = usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe));
command->follows = 0;
command->value = 0;
command->buffer = NULL;
target->callback = callback;
target->endp = endp;
target->urb = urb;
target->active = 1;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_edset_empty(struct platform_device *pdev, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_empty(ftdi, ed_number, endp, urb, address,
ep_number, toggle_bits, callback);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_empty);
static int ftdi_elan_edset_output(struct usb_ftdi *ftdi, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
u8 ed = ed_number - 1;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
u8 *b;
u16 urb_size;
int i = 0;
char data[30 *3 + 4];
char *d = data;
int m = (sizeof(data) - 1) / 3;
int l = 0;
struct u132_target *target = &ftdi->target[ed];
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x81 | (ed << 5);
command->address = (toggle_bits << 6) | (ep_number << 2)
| (address << 0);
command->width = usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe));
command->follows = min_t(u32, 1024,
urb->transfer_buffer_length -
urb->actual_length);
command->value = 0;
command->buffer = urb->transfer_buffer +
urb->actual_length;
command->length = 0x8000 | (command->follows - 1);
b = command->buffer;
urb_size = command->follows;
data[0] = 0;
while (urb_size-- > 0) {
if (i > m) {
} else if (i++ < m) {
int w = sprintf(d, " %02X", *b++);
d += w;
l += w;
} else
d += sprintf(d, " ..");
}
target->callback = callback;
target->endp = endp;
target->urb = urb;
target->active = 1;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_edset_output(struct platform_device *pdev, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_output(ftdi, ed_number, endp, urb, address,
ep_number, toggle_bits, callback);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_output);
static int ftdi_elan_edset_single(struct usb_ftdi *ftdi, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
u8 ed = ed_number - 1;
wait:if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
int command_size;
mutex_lock(&ftdi->u132_lock);
command_size = ftdi->command_next - ftdi->command_head;
if (command_size < COMMAND_SIZE) {
u32 remaining_length = urb->transfer_buffer_length -
urb->actual_length;
struct u132_target *target = &ftdi->target[ed];
struct u132_command *command = &ftdi->command[
COMMAND_MASK & ftdi->command_next];
command->header = 0x83 | (ed << 5);
if (remaining_length == 0) {
command->length = 0x0000;
} else if (remaining_length > 1024) {
command->length = 0x8000 | 1023;
} else
command->length = 0x8000 | (remaining_length -
1);
command->address = (toggle_bits << 6) | (ep_number << 2)
| (address << 0);
command->width = usb_maxpacket(urb->dev, urb->pipe,
usb_pipeout(urb->pipe));
command->follows = 0;
command->value = 0;
command->buffer = NULL;
target->callback = callback;
target->endp = endp;
target->urb = urb;
target->active = 1;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
goto wait;
}
}
}
int usb_ftdi_elan_edset_single(struct platform_device *pdev, u8 ed_number,
void *endp, struct urb *urb, u8 address, u8 ep_number, u8 toggle_bits,
void (*callback) (void *endp, struct urb *urb, u8 *buf, int len,
int toggle_bits, int error_count, int condition_code, int repeat_number,
int halted, int skipped, int actual, int non_null))
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_single(ftdi, ed_number, endp, urb, address,
ep_number, toggle_bits, callback);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_single);
static int ftdi_elan_edset_flush(struct usb_ftdi *ftdi, u8 ed_number,
void *endp)
{
u8 ed = ed_number - 1;
if (ftdi->disconnected > 0) {
return -ENODEV;
} else if (ftdi->initialized == 0) {
return -ENODEV;
} else {
struct u132_target *target = &ftdi->target[ed];
mutex_lock(&ftdi->u132_lock);
if (target->abandoning > 0) {
mutex_unlock(&ftdi->u132_lock);
return 0;
} else {
target->abandoning = 1;
wait_1:if (target->active == 1) {
int command_size = ftdi->command_next -
ftdi->command_head;
if (command_size < COMMAND_SIZE) {
struct u132_command *command =
&ftdi->command[COMMAND_MASK &
ftdi->command_next];
command->header = 0x80 | (ed << 5) |
0x4;
command->length = 0x00;
command->address = 0x00;
command->width = 0x00;
command->follows = 0;
command->value = 0;
command->buffer = &command->value;
ftdi->command_next += 1;
ftdi_elan_kick_command_queue(ftdi);
} else {
mutex_unlock(&ftdi->u132_lock);
msleep(100);
mutex_lock(&ftdi->u132_lock);
goto wait_1;
}
}
mutex_unlock(&ftdi->u132_lock);
return 0;
}
}
}
int usb_ftdi_elan_edset_flush(struct platform_device *pdev, u8 ed_number,
void *endp)
{
struct usb_ftdi *ftdi = platform_device_to_usb_ftdi(pdev);
return ftdi_elan_edset_flush(ftdi, ed_number, endp);
}
EXPORT_SYMBOL_GPL(usb_ftdi_elan_edset_flush);
static int ftdi_elan_flush_input_fifo(struct usb_ftdi *ftdi)
{
int retry_on_empty = 10;
int retry_on_timeout = 5;
int retry_on_status = 20;
more:{
int packet_bytes = 0;
int retval = usb_bulk_msg(ftdi->udev,
usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
ftdi->bulk_in_buffer, ftdi->bulk_in_size,
&packet_bytes, 100);
if (packet_bytes > 2) {
char diag[30 *3 + 4];
char *d = diag;
int m = (sizeof(diag) - 1) / 3;
char *b = ftdi->bulk_in_buffer;
int bytes_read = 0;
diag[0] = 0;
while (packet_bytes-- > 0) {
char c = *b++;
if (bytes_read < m) {
d += sprintf(d, " %02X",
0x000000FF & c);
} else if (bytes_read > m) {
} else
d += sprintf(d, " ..");
bytes_read += 1;
continue;
}
goto more;
} else if (packet_bytes > 1) {
char s1 = ftdi->bulk_in_buffer[0];
char s2 = ftdi->bulk_in_buffer[1];
if (s1 == 0x31 && s2 == 0x60) {
return 0;
} else if (retry_on_status-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
return -EFAULT;
}
} else if (packet_bytes > 0) {
char b1 = ftdi->bulk_in_buffer[0];
dev_err(&ftdi->udev->dev, "only one byte flushed from FTDI = %02X\n",
b1);
if (retry_on_status-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
return -EFAULT;
}
} else if (retval == -ETIMEDOUT) {
if (retry_on_timeout-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
return -ENOMEM;
}
} else if (retval == 0) {
if (retry_on_empty-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
return -ENOMEM;
}
} else {
dev_err(&ftdi->udev->dev, "error = %d\n", retval);
return retval;
}
}
return -1;
}
/*
* send the long flush sequence
*
*/
static int ftdi_elan_synchronize_flush(struct usb_ftdi *ftdi)
{
int retval;
struct urb *urb;
char *buf;
int I = 257;
int i = 0;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
dev_err(&ftdi->udev->dev, "could not alloc a urb for flush sequence\n");
return -ENOMEM;
}
buf = usb_alloc_coherent(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
if (!buf) {
dev_err(&ftdi->udev->dev, "could not get a buffer for flush sequence\n");
usb_free_urb(urb);
return -ENOMEM;
}
while (I-- > 0)
buf[i++] = 0x55;
usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
ftdi->bulk_out_endpointAddr), buf, i,
ftdi_elan_write_bulk_callback, ftdi);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
dev_err(&ftdi->udev->dev, "failed to submit urb containing the flush sequence\n");
usb_free_coherent(ftdi->udev, i, buf, urb->transfer_dma);
usb_free_urb(urb);
return -ENOMEM;
}
usb_free_urb(urb);
return 0;
}
/*
* send the reset sequence
*
*/
static int ftdi_elan_synchronize_reset(struct usb_ftdi *ftdi)
{
int retval;
struct urb *urb;
char *buf;
int I = 4;
int i = 0;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
dev_err(&ftdi->udev->dev, "could not get a urb for the reset sequence\n");
return -ENOMEM;
}
buf = usb_alloc_coherent(ftdi->udev, I, GFP_KERNEL, &urb->transfer_dma);
if (!buf) {
dev_err(&ftdi->udev->dev, "could not get a buffer for the reset sequence\n");
usb_free_urb(urb);
return -ENOMEM;
}
buf[i++] = 0x55;
buf[i++] = 0xAA;
buf[i++] = 0x5A;
buf[i++] = 0xA5;
usb_fill_bulk_urb(urb, ftdi->udev, usb_sndbulkpipe(ftdi->udev,
ftdi->bulk_out_endpointAddr), buf, i,
ftdi_elan_write_bulk_callback, ftdi);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
dev_err(&ftdi->udev->dev, "failed to submit urb containing the reset sequence\n");
usb_free_coherent(ftdi->udev, i, buf, urb->transfer_dma);
usb_free_urb(urb);
return -ENOMEM;
}
usb_free_urb(urb);
return 0;
}
static int ftdi_elan_synchronize(struct usb_ftdi *ftdi)
{
int retval;
int long_stop = 10;
int retry_on_timeout = 5;
int retry_on_empty = 10;
int err_count = 0;
retval = ftdi_elan_flush_input_fifo(ftdi);
if (retval)
return retval;
ftdi->bulk_in_left = 0;
ftdi->bulk_in_last = -1;
while (long_stop-- > 0) {
int read_stop;
int read_stuck;
retval = ftdi_elan_synchronize_flush(ftdi);
if (retval)
return retval;
retval = ftdi_elan_flush_input_fifo(ftdi);
if (retval)
return retval;
reset:retval = ftdi_elan_synchronize_reset(ftdi);
if (retval)
return retval;
read_stop = 100;
read_stuck = 10;
read:{
int packet_bytes = 0;
retval = usb_bulk_msg(ftdi->udev,
usb_rcvbulkpipe(ftdi->udev,
ftdi->bulk_in_endpointAddr),
ftdi->bulk_in_buffer, ftdi->bulk_in_size,
&packet_bytes, 500);
if (packet_bytes > 2) {
char diag[30 *3 + 4];
char *d = diag;
int m = (sizeof(diag) - 1) / 3;
char *b = ftdi->bulk_in_buffer;
int bytes_read = 0;
unsigned char c = 0;
diag[0] = 0;
while (packet_bytes-- > 0) {
c = *b++;
if (bytes_read < m) {
d += sprintf(d, " %02X", c);
} else if (bytes_read > m) {
} else
d += sprintf(d, " ..");
bytes_read += 1;
continue;
}
if (c == 0x7E) {
return 0;
} else {
if (c == 0x55) {
goto read;
} else if (read_stop-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "retry limit reached\n");
continue;
}
}
} else if (packet_bytes > 1) {
unsigned char s1 = ftdi->bulk_in_buffer[0];
unsigned char s2 = ftdi->bulk_in_buffer[1];
if (s1 == 0x31 && s2 == 0x00) {
if (read_stuck-- > 0) {
goto read;
} else
goto reset;
} else if (s1 == 0x31 && s2 == 0x60) {
if (read_stop-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "retry limit reached\n");
continue;
}
} else {
if (read_stop-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "retry limit reached\n");
continue;
}
}
} else if (packet_bytes > 0) {
if (read_stop-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "retry limit reached\n");
continue;
}
} else if (retval == -ETIMEDOUT) {
if (retry_on_timeout-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
continue;
}
} else if (retval == 0) {
if (retry_on_empty-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
continue;
}
} else {
err_count += 1;
dev_err(&ftdi->udev->dev, "error = %d\n",
retval);
if (read_stop-- > 0) {
goto read;
} else {
dev_err(&ftdi->udev->dev, "retry limit reached\n");
continue;
}
}
}
}
dev_err(&ftdi->udev->dev, "failed to synchronize\n");
return -EFAULT;
}
static int ftdi_elan_stuck_waiting(struct usb_ftdi *ftdi)
{
int retry_on_empty = 10;
int retry_on_timeout = 5;
int retry_on_status = 50;
more:{
int packet_bytes = 0;
int retval = usb_bulk_msg(ftdi->udev,
usb_rcvbulkpipe(ftdi->udev, ftdi->bulk_in_endpointAddr),
ftdi->bulk_in_buffer, ftdi->bulk_in_size,
&packet_bytes, 1000);
if (packet_bytes > 2) {
char diag[30 *3 + 4];
char *d = diag;
int m = (sizeof(diag) - 1) / 3;
char *b = ftdi->bulk_in_buffer;
int bytes_read = 0;
diag[0] = 0;
while (packet_bytes-- > 0) {
char c = *b++;
if (bytes_read < m) {
d += sprintf(d, " %02X",
0x000000FF & c);
} else if (bytes_read > m) {
} else
d += sprintf(d, " ..");
bytes_read += 1;
continue;
}
goto more;
} else if (packet_bytes > 1) {
char s1 = ftdi->bulk_in_buffer[0];
char s2 = ftdi->bulk_in_buffer[1];
if (s1 == 0x31 && s2 == 0x60) {
return 0;
} else if (retry_on_status-- > 0) {
msleep(5);
goto more;
} else
return -EFAULT;
} else if (packet_bytes > 0) {
char b1 = ftdi->bulk_in_buffer[0];
dev_err(&ftdi->udev->dev, "only one byte flushed from FTDI = %02X\n", b1);
if (retry_on_status-- > 0) {
msleep(5);
goto more;
} else {
dev_err(&ftdi->udev->dev, "STATUS ERROR retry limit reached\n");
return -EFAULT;
}
} else if (retval == -ETIMEDOUT) {
if (retry_on_timeout-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "TIMED OUT retry limit reached\n");
return -ENOMEM;
}
} else if (retval == 0) {
if (retry_on_empty-- > 0) {
goto more;
} else {
dev_err(&ftdi->udev->dev, "empty packet retry limit reached\n");
return -ENOMEM;
}
} else {
dev_err(&ftdi->udev->dev, "error = %d\n", retval);
return -ENOMEM;
}
}
return -1;
}
static int ftdi_elan_checkingPCI(struct usb_ftdi *ftdi)
{
int UxxxStatus = ftdi_elan_read_reg(ftdi, &ftdi->controlreg);
if (UxxxStatus)
return UxxxStatus;
if (ftdi->controlreg & 0x00400000) {
if (ftdi->card_ejected) {
} else {
ftdi->card_ejected = 1;
dev_err(&ftdi->udev->dev, "CARD EJECTED - controlreg = %08X\n",
ftdi->controlreg);
}
return -ENODEV;
} else {
u8 fn = ftdi->function - 1;
int activePCIfn = fn << 8;
u32 pcidata;
u32 pciVID;
u32 pciPID;
int reg = 0;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
pciVID = pcidata & 0xFFFF;
pciPID = (pcidata >> 16) & 0xFFFF;
if (pciVID == ftdi->platform_data.vendor && pciPID ==
ftdi->platform_data.device) {
return 0;
} else {
dev_err(&ftdi->udev->dev, "vendor=%04X pciVID=%04X device=%04X pciPID=%04X\n",
ftdi->platform_data.vendor, pciVID,
ftdi->platform_data.device, pciPID);
return -ENODEV;
}
}
}
#define ftdi_read_pcimem(ftdi, member, data) ftdi_elan_read_pcimem(ftdi, \
offsetof(struct ohci_regs, member), 0, data);
#define ftdi_write_pcimem(ftdi, member, data) ftdi_elan_write_pcimem(ftdi, \
offsetof(struct ohci_regs, member), 0, data);
#define OHCI_CONTROL_INIT OHCI_CTRL_CBSR
#define OHCI_INTR_INIT (OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_RD | \
OHCI_INTR_WDH)
static int ftdi_elan_check_controller(struct usb_ftdi *ftdi, int quirk)
{
int devices = 0;
int retval;
u32 hc_control;
int num_ports;
u32 control;
u32 rh_a = -1;
u32 status;
u32 fminterval;
u32 hc_fminterval;
u32 periodicstart;
u32 cmdstatus;
u32 roothub_a;
int mask = OHCI_INTR_INIT;
int sleep_time = 0;
int reset_timeout = 30; /* ... allow extra time */
int temp;
retval = ftdi_write_pcimem(ftdi, intrdisable, OHCI_INTR_MIE);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, roothub.a, &rh_a);
if (retval)
return retval;
num_ports = rh_a & RH_A_NDP;
retval = ftdi_read_pcimem(ftdi, fminterval, &hc_fminterval);
if (retval)
return retval;
hc_fminterval &= 0x3fff;
if (hc_fminterval != FI) {
}
hc_fminterval |= FSMP(hc_fminterval) << 16;
retval = ftdi_read_pcimem(ftdi, control, &hc_control);
if (retval)
return retval;
switch (hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
sleep_time = 0;
break;
case OHCI_USB_SUSPEND:
case OHCI_USB_RESUME:
hc_control &= OHCI_CTRL_RWC;
hc_control |= OHCI_USB_RESUME;
sleep_time = 10;
break;
default:
hc_control &= OHCI_CTRL_RWC;
hc_control |= OHCI_USB_RESET;
sleep_time = 50;
break;
}
retval = ftdi_write_pcimem(ftdi, control, hc_control);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
msleep(sleep_time);
retval = ftdi_read_pcimem(ftdi, roothub.a, &roothub_a);
if (retval)
return retval;
if (!(roothub_a & RH_A_NPS)) { /* power down each port */
for (temp = 0; temp < num_ports; temp++) {
retval = ftdi_write_pcimem(ftdi,
roothub.portstatus[temp], RH_PS_LSDA);
if (retval)
return retval;
}
}
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
retry:retval = ftdi_read_pcimem(ftdi, cmdstatus, &status);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, cmdstatus, OHCI_HCR);
if (retval)
return retval;
extra:{
retval = ftdi_read_pcimem(ftdi, cmdstatus, &status);
if (retval)
return retval;
if (0 != (status & OHCI_HCR)) {
if (--reset_timeout == 0) {
dev_err(&ftdi->udev->dev, "USB HC reset timed out!\n");
return -ENODEV;
} else {
msleep(5);
goto extra;
}
}
}
if (quirk & OHCI_QUIRK_INITRESET) {
retval = ftdi_write_pcimem(ftdi, control, hc_control);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
}
retval = ftdi_write_pcimem(ftdi, ed_controlhead, 0x00000000);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, ed_bulkhead, 0x11000000);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, hcca, 0x00000000);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, fminterval, &fminterval);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, fminterval,
((fminterval & FIT) ^ FIT) | hc_fminterval);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, periodicstart,
((9 *hc_fminterval) / 10) & 0x3fff);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, fminterval, &fminterval);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, periodicstart, &periodicstart);
if (retval)
return retval;
if (0 == (fminterval & 0x3fff0000) || 0 == periodicstart) {
if (!(quirk & OHCI_QUIRK_INITRESET)) {
quirk |= OHCI_QUIRK_INITRESET;
goto retry;
} else
dev_err(&ftdi->udev->dev, "init err(%08x %04x)\n",
fminterval, periodicstart);
} /* start controller operations */
hc_control &= OHCI_CTRL_RWC;
hc_control |= OHCI_CONTROL_INIT | OHCI_CTRL_BLE | OHCI_USB_OPER;
retval = ftdi_write_pcimem(ftdi, control, hc_control);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, cmdstatus, OHCI_BLF);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, cmdstatus, &cmdstatus);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, roothub.status, RH_HS_DRWE);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, intrstatus, mask);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, intrdisable,
OHCI_INTR_MIE | OHCI_INTR_OC | OHCI_INTR_RHSC | OHCI_INTR_FNO |
OHCI_INTR_UE | OHCI_INTR_RD | OHCI_INTR_SF | OHCI_INTR_WDH |
OHCI_INTR_SO);
if (retval)
return retval; /* handle root hub init quirks ... */
retval = ftdi_read_pcimem(ftdi, roothub.a, &roothub_a);
if (retval)
return retval;
roothub_a &= ~(RH_A_PSM | RH_A_OCPM);
if (quirk & OHCI_QUIRK_SUPERIO) {
roothub_a |= RH_A_NOCP;
roothub_a &= ~(RH_A_POTPGT | RH_A_NPS);
retval = ftdi_write_pcimem(ftdi, roothub.a, roothub_a);
if (retval)
return retval;
} else if ((quirk & OHCI_QUIRK_AMD756) || distrust_firmware) {
roothub_a |= RH_A_NPS;
retval = ftdi_write_pcimem(ftdi, roothub.a, roothub_a);
if (retval)
return retval;
}
retval = ftdi_write_pcimem(ftdi, roothub.status, RH_HS_LPSC);
if (retval)
return retval;
retval = ftdi_write_pcimem(ftdi, roothub.b,
(roothub_a & RH_A_NPS) ? 0 : RH_B_PPCM);
if (retval)
return retval;
retval = ftdi_read_pcimem(ftdi, control, &control);
if (retval)
return retval;
mdelay((roothub_a >> 23) & 0x1fe);
for (temp = 0; temp < num_ports; temp++) {
u32 portstatus;
retval = ftdi_read_pcimem(ftdi, roothub.portstatus[temp],
&portstatus);
if (retval)
return retval;
if (1 & portstatus)
devices += 1;
}
return devices;
}
static int ftdi_elan_setup_controller(struct usb_ftdi *ftdi, int fn)
{
u32 latence_timer;
int UxxxStatus;
u32 pcidata;
int reg = 0;
int activePCIfn = fn << 8;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x2800);
if (UxxxStatus)
return UxxxStatus;
reg = 16;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
0xFFFFFFFF);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
0xF0000000);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
reg = 12;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&latence_timer);
if (UxxxStatus)
return UxxxStatus;
latence_timer &= 0xFFFF00FF;
latence_timer |= 0x00001600;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
latence_timer);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
reg = 4;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
0x06);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
for (reg = 0; reg <= 0x54; reg += 4) {
UxxxStatus = ftdi_elan_read_pcimem(ftdi, reg, 0, &pcidata);
if (UxxxStatus)
return UxxxStatus;
}
return 0;
}
static int ftdi_elan_close_controller(struct usb_ftdi *ftdi, int fn)
{
u32 latence_timer;
int UxxxStatus;
u32 pcidata;
int reg = 0;
int activePCIfn = fn << 8;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x2800);
if (UxxxStatus)
return UxxxStatus;
reg = 16;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
0xFFFFFFFF);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0,
0x00000000);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
reg = 12;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&latence_timer);
if (UxxxStatus)
return UxxxStatus;
latence_timer &= 0xFFFF00FF;
latence_timer |= 0x00001600;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
latence_timer);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
reg = 4;
UxxxStatus = ftdi_elan_write_config(ftdi, activePCIfn | reg, 0x00,
0x00);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
return 0;
}
static int ftdi_elan_found_controller(struct usb_ftdi *ftdi, int fn, int quirk)
{
int result;
int UxxxStatus;
UxxxStatus = ftdi_elan_setup_controller(ftdi, fn);
if (UxxxStatus)
return UxxxStatus;
result = ftdi_elan_check_controller(ftdi, quirk);
UxxxStatus = ftdi_elan_close_controller(ftdi, fn);
if (UxxxStatus)
return UxxxStatus;
return result;
}
static int ftdi_elan_enumeratePCI(struct usb_ftdi *ftdi)
{
u32 controlreg;
u8 sensebits;
int UxxxStatus;
UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000000L);
if (UxxxStatus)
return UxxxStatus;
msleep(750);
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x100);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x00000200L | 0x500);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020CL | 0x000);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020DL | 0x000);
if (UxxxStatus)
return UxxxStatus;
msleep(250);
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000020FL | 0x000);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_write_reg(ftdi, 0x0000025FL | 0x800);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
if (UxxxStatus)
return UxxxStatus;
UxxxStatus = ftdi_elan_read_reg(ftdi, &controlreg);
if (UxxxStatus)
return UxxxStatus;
msleep(1000);
sensebits = (controlreg >> 16) & 0x000F;
if (0x0D == sensebits)
return 0;
else
return - ENXIO;
}
static int ftdi_elan_setupOHCI(struct usb_ftdi *ftdi)
{
int UxxxStatus;
u32 pcidata;
int reg = 0;
u8 fn;
int activePCIfn = 0;
int max_devices = 0;
int controllers = 0;
int unrecognized = 0;
ftdi->function = 0;
for (fn = 0; (fn < 4); fn++) {
u32 pciVID = 0;
u32 pciPID = 0;
int devices = 0;
activePCIfn = fn << 8;
UxxxStatus = ftdi_elan_read_config(ftdi, activePCIfn | reg, 0,
&pcidata);
if (UxxxStatus)
return UxxxStatus;
pciVID = pcidata & 0xFFFF;
pciPID = (pcidata >> 16) & 0xFFFF;
if ((pciVID == PCI_VENDOR_ID_OPTI) && (pciPID == 0xc861)) {
devices = ftdi_elan_found_controller(ftdi, fn, 0);
controllers += 1;
} else if ((pciVID == PCI_VENDOR_ID_NEC) && (pciPID == 0x0035))
{
devices = ftdi_elan_found_controller(ftdi, fn, 0);
controllers += 1;
} else if ((pciVID == PCI_VENDOR_ID_AL) && (pciPID == 0x5237)) {
devices = ftdi_elan_found_controller(ftdi, fn, 0);
controllers += 1;
} else if ((pciVID == PCI_VENDOR_ID_ATT) && (pciPID == 0x5802))
{
devices = ftdi_elan_found_controller(ftdi, fn, 0);
controllers += 1;
} else if (pciVID == PCI_VENDOR_ID_AMD && pciPID == 0x740c) {
devices = ftdi_elan_found_controller(ftdi, fn,
OHCI_QUIRK_AMD756);
controllers += 1;
} else if (pciVID == PCI_VENDOR_ID_COMPAQ && pciPID == 0xa0f8) {
devices = ftdi_elan_found_controller(ftdi, fn,
OHCI_QUIRK_ZFMICRO);
controllers += 1;
} else if (0 == pcidata) {
} else
unrecognized += 1;
if (devices > max_devices) {
max_devices = devices;
ftdi->function = fn + 1;
ftdi->platform_data.vendor = pciVID;
ftdi->platform_data.device = pciPID;
}
}
if (ftdi->function > 0) {
UxxxStatus = ftdi_elan_setup_controller(ftdi,
ftdi->function - 1);
if (UxxxStatus)
return UxxxStatus;
return 0;
} else if (controllers > 0) {
return -ENXIO;
} else if (unrecognized > 0) {
return -ENXIO;
} else {
ftdi->enumerated = 0;
return -ENXIO;
}
}
/*
* we use only the first bulk-in and bulk-out endpoints
*/
static int ftdi_elan_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
size_t buffer_size;
int i;
int retval = -ENOMEM;
struct usb_ftdi *ftdi;
ftdi = kzalloc(sizeof(struct usb_ftdi), GFP_KERNEL);
if (!ftdi)
return -ENOMEM;
mutex_lock(&ftdi_module_lock);
list_add_tail(&ftdi->ftdi_list, &ftdi_static_list);
ftdi->sequence_num = ++ftdi_instances;
mutex_unlock(&ftdi_module_lock);
ftdi_elan_init_kref(ftdi);
sema_init(&ftdi->sw_lock, 1);
ftdi->udev = usb_get_dev(interface_to_usbdev(interface));
ftdi->interface = interface;
mutex_init(&ftdi->u132_lock);
ftdi->expected = 4;
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!ftdi->bulk_in_endpointAddr &&
usb_endpoint_is_bulk_in(endpoint)) {
buffer_size = usb_endpoint_maxp(endpoint);
ftdi->bulk_in_size = buffer_size;
ftdi->bulk_in_endpointAddr = endpoint->bEndpointAddress;
ftdi->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!ftdi->bulk_in_buffer) {
dev_err(&ftdi->udev->dev, "Could not allocate bulk_in_buffer\n");
retval = -ENOMEM;
goto error;
}
}
if (!ftdi->bulk_out_endpointAddr &&
usb_endpoint_is_bulk_out(endpoint)) {
ftdi->bulk_out_endpointAddr =
endpoint->bEndpointAddress;
}
}
if (!(ftdi->bulk_in_endpointAddr && ftdi->bulk_out_endpointAddr)) {
dev_err(&ftdi->udev->dev, "Could not find both bulk-in and bulk-out endpoints\n");
retval = -ENODEV;
goto error;
}
dev_info(&ftdi->udev->dev, "interface %d has I=%02X O=%02X\n",
iface_desc->desc.bInterfaceNumber, ftdi->bulk_in_endpointAddr,
ftdi->bulk_out_endpointAddr);
usb_set_intfdata(interface, ftdi);
if (iface_desc->desc.bInterfaceNumber == 0 &&
ftdi->bulk_in_endpointAddr == 0x81 &&
ftdi->bulk_out_endpointAddr == 0x02) {
retval = usb_register_dev(interface, &ftdi_elan_jtag_class);
if (retval) {
dev_err(&ftdi->udev->dev, "Not able to get a minor for this device\n");
usb_set_intfdata(interface, NULL);
retval = -ENOMEM;
goto error;
} else {
ftdi->class = &ftdi_elan_jtag_class;
dev_info(&ftdi->udev->dev, "USB FDTI=%p JTAG interface %d now attached to ftdi%d\n",
ftdi, iface_desc->desc.bInterfaceNumber,
interface->minor);
return 0;
}
} else if (iface_desc->desc.bInterfaceNumber == 1 &&
ftdi->bulk_in_endpointAddr == 0x83 &&
ftdi->bulk_out_endpointAddr == 0x04) {
ftdi->class = NULL;
dev_info(&ftdi->udev->dev, "USB FDTI=%p ELAN interface %d now activated\n",
ftdi, iface_desc->desc.bInterfaceNumber);
INIT_DELAYED_WORK(&ftdi->status_work, ftdi_elan_status_work);
INIT_DELAYED_WORK(&ftdi->command_work, ftdi_elan_command_work);
INIT_DELAYED_WORK(&ftdi->respond_work, ftdi_elan_respond_work);
ftdi_status_queue_work(ftdi, msecs_to_jiffies(3 *1000));
return 0;
} else {
dev_err(&ftdi->udev->dev,
"Could not find ELAN's U132 device\n");
retval = -ENODEV;
goto error;
}
error:if (ftdi) {
ftdi_elan_put_kref(ftdi);
}
return retval;
}
static void ftdi_elan_disconnect(struct usb_interface *interface)
{
struct usb_ftdi *ftdi = usb_get_intfdata(interface);
ftdi->disconnected += 1;
if (ftdi->class) {
int minor = interface->minor;
struct usb_class_driver *class = ftdi->class;
usb_set_intfdata(interface, NULL);
usb_deregister_dev(interface, class);
dev_info(&ftdi->udev->dev, "USB FTDI U132 jtag interface on minor %d now disconnected\n",
minor);
} else {
ftdi_status_cancel_work(ftdi);
ftdi_command_cancel_work(ftdi);
ftdi_response_cancel_work(ftdi);
ftdi_elan_abandon_completions(ftdi);
ftdi_elan_abandon_targets(ftdi);
if (ftdi->registered) {
platform_device_unregister(&ftdi->platform_dev);
ftdi->synchronized = 0;
ftdi->enumerated = 0;
ftdi->initialized = 0;
ftdi->registered = 0;
}
flush_workqueue(status_queue);
flush_workqueue(command_queue);
flush_workqueue(respond_queue);
ftdi->disconnected += 1;
usb_set_intfdata(interface, NULL);
dev_info(&ftdi->udev->dev, "USB FTDI U132 host controller interface now disconnected\n");
}
ftdi_elan_put_kref(ftdi);
}
static struct usb_driver ftdi_elan_driver = {
.name = "ftdi-elan",
.probe = ftdi_elan_probe,
.disconnect = ftdi_elan_disconnect,
.id_table = ftdi_elan_table,
};
static int __init ftdi_elan_init(void)
{
int result;
pr_info("driver %s\n", ftdi_elan_driver.name);
mutex_init(&ftdi_module_lock);
INIT_LIST_HEAD(&ftdi_static_list);
status_queue = create_singlethread_workqueue("ftdi-status-control");
if (!status_queue)
goto err_status_queue;
command_queue = create_singlethread_workqueue("ftdi-command-engine");
if (!command_queue)
goto err_command_queue;
respond_queue = create_singlethread_workqueue("ftdi-respond-engine");
if (!respond_queue)
goto err_respond_queue;
result = usb_register(&ftdi_elan_driver);
if (result) {
destroy_workqueue(status_queue);
destroy_workqueue(command_queue);
destroy_workqueue(respond_queue);
pr_err("usb_register failed. Error number %d\n", result);
}
return result;
err_respond_queue:
destroy_workqueue(command_queue);
err_command_queue:
destroy_workqueue(status_queue);
err_status_queue:
pr_err("%s couldn't create workqueue\n", ftdi_elan_driver.name);
return -ENOMEM;
}
static void __exit ftdi_elan_exit(void)
{
struct usb_ftdi *ftdi;
struct usb_ftdi *temp;
usb_deregister(&ftdi_elan_driver);
pr_info("ftdi_u132 driver deregistered\n");
list_for_each_entry_safe(ftdi, temp, &ftdi_static_list, ftdi_list) {
ftdi_status_cancel_work(ftdi);
ftdi_command_cancel_work(ftdi);
ftdi_response_cancel_work(ftdi);
} flush_workqueue(status_queue);
destroy_workqueue(status_queue);
status_queue = NULL;
flush_workqueue(command_queue);
destroy_workqueue(command_queue);
command_queue = NULL;
flush_workqueue(respond_queue);
destroy_workqueue(respond_queue);
respond_queue = NULL;
}
module_init(ftdi_elan_init);
module_exit(ftdi_elan_exit);
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