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ft60x.c
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ft60x.c
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/*
* USB FT60x driver - 2.2
*
* Copyright (C) 2018 ramtin@lambdaconcept.com
* po@lambdaconcept.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.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
/* Define these values to match your devices */
#define USB_FT60X_VENDOR_ID 0x0403
#define USB_FT60X_PRODUCT_ID 0x601f
/* table of devices that work with this driver */
static const struct usb_device_id ft60x_table[] = {
{USB_DEVICE(USB_FT60X_VENDOR_ID, USB_FT60X_PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, ft60x_table);
/* Get a minor */
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define USB_FT60X_MINOR_BASE 0
#else
#define USB_FT60X_MINOR_BASE 192
#endif
/* our private defines. if this grows any larger, use your own .h file */
#define MAX_TRANSFER 2048
#define WRITES_IN_FLIGHT 8
/* arbitrarily chosen */
#define FT60X_MAX_IF 5
struct ft60x_config {
/* Device Descriptor */
u16 VendorID;
u16 ProductID;
/* String Descriptors */
u8 StringDescriptors[128];
/* Configuration Descriptor */
u8 Reserved;
u8 PowerAttributes;
u16 PowerConsumption;
/* Data Transfer Configuration */
u8 Reserved2;
u8 FIFOClock;
u8 FIFOMode;
u8 ChannelConfig;
/* Optional Feature Support */
u16 OptionalFeatureSupport;
u8 BatteryChargingGPIOConfig;
u8 FlashEEPROMDetection; /* Read-only */
/* MSIO and GPIO Configuration */
u32 MSIO_Control;
u32 GPIO_Control;
} __attribute__ ((packed));
/* Structure to hold all of our device specific stuff */
struct usb_ft60x {
struct ft60x_device *ft;
struct usb_device *udev; /* the usb device for this device */
struct usb_interface *interface; /* the interface for this device */
struct semaphore limit_sem; /* limiting the number of writes in progress */
struct usb_anchor submitted; /* in case we need to retract our submissions */
struct urb *int_in_urb; /* the urb to read data with */
size_t int_in_size; /* the size of the receive buffer */
signed char *int_in_buffer; /* the buffer to receive int data */
dma_addr_t int_in_data_dma; /* the dma buffer to receive int data */
wait_queue_head_t int_in_wait; /* to wait for an ongoing read */
bool got_int; /* got interrupted */
bool busy_write; /* for the writing poll */
bool done_reading;
struct urb *bulk_in_urb; /* the urb to read data with */
size_t bulk_in_size; /* the size of the receive buffer */
size_t bulk_in_filled; /* number of bytes in the buffer */
size_t bulk_in_copied; /* already copied to user space */
unsigned char *bulk_in_buffer; /* the buffer to receive data */
wait_queue_head_t bulk_in_wait; /* to wait for an ongoing read */
wait_queue_head_t bulk_out_wait; /* to wait for an ongoing write */
bool ongoing_read; /* a read is going on */
int len_to_read;
bool sent_cmd_read;
bool waiting_int;
__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
__u8 int_in_endpointAddr; /* the address of the int in endpoint */
int errors; /* the last request tanked */
spinlock_t err_lock; /* lock for errors */
struct kref kref;
struct mutex io_mutex; /* synchronize I/O with disconnect */
};
#define to_ft60x_dev(d) container_of(d, struct usb_ft60x, kref)
struct ft60x_ctrlreq {
u32 idx;
u8 pipe;
u8 cmd;
u8 unk1;
u8 unk2;
u32 len;
u32 unk4;
u32 unk5;
} __attribute__ ((packed));
struct ft60x_irqresp {
int idx;
short ep;
short len;
int val2;
} __attribute__ ((packed));
struct ft60x_device {
struct usb_device *udev;
struct ft60x_config ft60x_cfg;
struct usb_ft60x *ft60x_interface[FT60X_MAX_IF];
struct ft60x_ctrlreq ctrlreq;
int respidx;
int n_interface;
struct list_head list;
wait_queue_head_t int_in_wait; /* to wait for an ongoing read */
};
static LIST_HEAD(ft60x_list);
#define to_ft60x_dev(d) container_of(d, struct usb_ft60x, kref)
static struct usb_driver ft60x_driver;
static void ft60x_draw_down(struct usb_ft60x *dev);
static int ft60x_set_config(struct ft60x_device *ft,
struct ft60x_config *ft60x_cfg);
static void ft60x_delete(struct kref *kref)
{
struct usb_ft60x *dev = to_ft60x_dev(kref);
if (dev->bulk_in_urb) {
usb_free_urb(dev->bulk_in_urb);
dev->bulk_in_urb = NULL;
}
if (dev->int_in_urb) {
usb_free_urb(dev->int_in_urb);
dev->int_in_urb = NULL;
}
usb_put_dev(dev->udev);
if (dev->int_in_buffer) {
usb_free_coherent(dev->udev,
dev->int_in_size,
dev->int_in_buffer, dev->int_in_data_dma);
dev->int_in_buffer = NULL;
}
if (dev->bulk_in_buffer) {
kfree(dev->bulk_in_buffer);
dev->bulk_in_buffer = NULL;
}
dev->ft->n_interface--;
if (dev->ft->n_interface == 0) {
/* last interface, so removing device */
list_del(&dev->ft->list);
kfree(dev->ft);
}
kfree(dev);
}
static int ft60x_ctrl_req(struct ft60x_device *ft)
{
int actual_len = 0;
u8 *b = NULL;
int retval = 0;
//printk(KERN_INFO "IN_FUNCTION %s\n", __func__);
if (!ft) {
retval = -EINVAL;
goto exit;
}
b = kmalloc(sizeof(struct ft60x_ctrlreq), GFP_KERNEL);
if (!b) {
retval = -ENOMEM;
printk(KERN_ERR "NOT ENOUGH MEM\n");
goto exit;
}
memcpy(b, &ft->ctrlreq, sizeof(struct ft60x_ctrlreq));
retval = usb_bulk_msg(ft->udev,
usb_sndbulkpipe(ft->udev, 1), b,
sizeof(struct ft60x_ctrlreq), &actual_len, 1000);
if (retval) {
printk("%s: command bulk message failed: error %d\n",
__func__, retval);
goto exit;
}
exit:
if (b) {
kfree(b);
}
return retval;
}
static int ft60x_open(struct inode *inode, struct file *file)
{
struct usb_ft60x *dev;
struct usb_interface *interface;
int subminor;
int retval = 0;
subminor = iminor(inode);
interface = usb_find_interface(&ft60x_driver, subminor);
if (!interface) {
pr_err("%s - error, can't find device for minor %d\n",
__func__, subminor);
retval = -ENODEV;
goto exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto exit;
}
retval = usb_autopm_get_interface(interface);
if (retval)
goto exit;
/* increment our usage count for the device */
kref_get(&dev->kref);
/* save our object in the file's private structure */
file->private_data = dev;
exit:
return retval;
}
static int ft60x_release(struct inode *inode, struct file *file)
{
struct usb_ft60x *dev;
struct ft60x_device *ft;
dev = file->private_data;
if (dev == NULL)
return -ENODEV;
ft = dev->ft;
ft->ctrlreq.idx++;
ft->ctrlreq.pipe = dev->bulk_in_endpointAddr;
ft->ctrlreq.cmd = 0;
ft->ctrlreq.unk1 = 0;
ft->ctrlreq.unk2 = 0;
ft->ctrlreq.len = 0;
ft->ctrlreq.unk4 = 0;
ft->ctrlreq.unk5 = 0;
ft60x_ctrl_req(ft);
ft->ctrlreq.idx++;
ft->ctrlreq.pipe = dev->bulk_in_endpointAddr;
ft->ctrlreq.cmd = 3;
ft->ctrlreq.unk1 = 0;
ft->ctrlreq.unk2 = 0;
ft->ctrlreq.len = 0;
ft->ctrlreq.unk4 = 0;
ft->ctrlreq.unk5 = 0;
ft60x_ctrl_req(ft);
/* allow the device to be autosuspended */
mutex_lock(&dev->io_mutex);
if (dev->interface)
usb_autopm_put_interface(dev->interface);
mutex_unlock(&dev->io_mutex);
/* decrement the count on our device */
kref_put(&dev->kref, ft60x_delete);
return 0;
}
static unsigned int ft60x_poll(struct file *file, poll_table * wait)
{
struct usb_ft60x *dev;
unsigned int mask = 0;
char notif;
//printk(KERN_INFO "IN_FUNCTION %s\n", __func__);
dev = file->private_data;
if (!dev->interface)
return POLLERR | POLLHUP;
notif = (dev->ft->ft60x_cfg.OptionalFeatureSupport >> dev->bulk_out_endpointAddr) & 1;
poll_wait(file, &dev->bulk_in_wait, wait);
//poll_wait(file, &dev->bulk_out_wait, wait);
poll_wait(file, &dev->int_in_wait, wait);
/* if no notif, we always can read/write, better not use poll */
if (!notif) {
mask |= POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
return mask;
}
if (((dev->bulk_in_filled - dev->bulk_in_copied) && dev->done_reading)
|| dev->got_int) {
dev->got_int = 0;
mask |= POLLIN | POLLRDNORM;
}
if (!dev->busy_write) {
mask |= POLLOUT | POLLWRNORM;
}
return mask;
}
static int ft60x_flush(struct file *file, fl_owner_t id)
{
struct usb_ft60x *dev;
int res;
dev = file->private_data;
if (dev == NULL)
return -ENODEV;
/* wait for io to stop */
mutex_lock(&dev->io_mutex);
ft60x_draw_down(dev);
/* read out errors, leave subsequent opens a clean slate */
spin_lock_irq(&dev->err_lock);
res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0;
dev->errors = 0;
spin_unlock_irq(&dev->err_lock);
mutex_unlock(&dev->io_mutex);
return res;
}
static void ft60x_int_callback(struct urb *urb)
{
int retval;
struct usb_ft60x *dev = urb->context;
struct usb_ft60x *tmpdev;
struct ft60x_device *ft = dev->ft;
struct ft60x_irqresp *irqresp;
int i;
int ongoing_read;
switch (urb->status) {
case 0: /* success */
irqresp = (struct ft60x_irqresp *)dev->int_in_buffer;
for (i = 0; i < FT60X_MAX_IF; i++) {
tmpdev = ft->ft60x_interface[i];
if (tmpdev) {
if (tmpdev->bulk_in_endpointAddr == irqresp->ep) {
tmpdev->got_int = 1;
tmpdev->len_to_read = irqresp->len;
tmpdev->sent_cmd_read = 0;
spin_lock(&tmpdev->err_lock);
ongoing_read = tmpdev->ongoing_read;
spin_unlock(&tmpdev->err_lock);
/* we had a read URB going on, have to kill it */
if (ongoing_read && !tmpdev->waiting_int) {
usb_unlink_urb(tmpdev->bulk_in_urb);
}
if (tmpdev->waiting_int) {
spin_lock(&tmpdev->err_lock);
tmpdev->ongoing_read = 0;
spin_unlock(&tmpdev->err_lock);
tmpdev->waiting_int = 0;
}
wake_up_interruptible(&tmpdev->int_in_wait);
wake_up_interruptible(&tmpdev->bulk_in_wait);
}
}
}
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
printk(KERN_INFO "%s - urb shutting down with status: %d\n",
__func__, urb->status);
return;
default:
printk(KERN_INFO "%s - nonzero urb status received: %d\n",
__func__, urb->status);
goto exit;
}
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval) {
printk(KERN_ERR "%s - usb_submit_urb failed with result: %d\n",
__func__, retval);
}
}
static void ft60x_read_bulk_callback(struct urb *urb)
{
struct usb_ft60x *dev;
//printk(KERN_INFO "IN_FUNCTION %s\n", __func__);
dev = urb->context;
spin_lock(&dev->err_lock);
/* sync/async unlink faults aren't errors */
if (urb->status) {
if (!(urb->status == -ENOENT ||
urb->status == -ECONNRESET || urb->status == -ESHUTDOWN))
dev_err(&dev->interface->dev,
"%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
dev->errors = urb->status;
}
dev->bulk_in_filled = urb->actual_length;
dev->len_to_read -= urb->actual_length;
dev->ongoing_read = 0;
spin_unlock(&dev->err_lock);
wake_up_interruptible(&dev->bulk_in_wait);
}
static int ft60x_send_cmd_read(struct usb_ft60x *dev, size_t count)
{
int retval = 0;
char notif;
if (!dev) {
retval = -ENODEV;
goto exit;
}
notif = (dev->ft->ft60x_cfg.OptionalFeatureSupport >> dev->bulk_out_endpointAddr) & 1;
dev->ft->ctrlreq.idx++;
dev->ft->ctrlreq.pipe = dev->bulk_in_endpointAddr;
dev->ft->ctrlreq.cmd = 1;
if (notif) {
dev->ft->ctrlreq.len = umin(dev->bulk_in_size * 128, dev->len_to_read);
} else {
dev->ft->ctrlreq.len = dev->bulk_in_size * 128;
}
retval = ft60x_ctrl_req(dev->ft);
dev->sent_cmd_read = 1;
exit:
return retval;
}
static int ft60x_do_read_io(struct usb_ft60x *dev, size_t count)
{
int rv = 0;
char notif;
//printk(KERN_INFO "IN_FUNCTION %s\n", __func__);
/* If we are in notification mode */
notif = (dev->ft->ft60x_cfg.OptionalFeatureSupport >> dev->bulk_out_endpointAddr) & 1;
if (notif) {
if ((dev->len_to_read > 0) && !dev->sent_cmd_read) {
ft60x_send_cmd_read(dev, count);
}
} else {
ft60x_send_cmd_read(dev, count);
}
/* Can't read now ! */
if (notif && (dev->len_to_read <= 0)) {
spin_lock_irq(&dev->err_lock);
dev->ongoing_read = 1;
dev->waiting_int = 1;
spin_unlock_irq(&dev->err_lock);
return rv;
}
if (notif) {
usb_fill_bulk_urb(dev->bulk_in_urb,
dev->udev,
usb_rcvbulkpipe(dev->udev,
dev->bulk_in_endpointAddr),
dev->bulk_in_buffer,
umin(dev->bulk_in_size * 128,
dev->len_to_read),
ft60x_read_bulk_callback, dev);
} else {
usb_fill_bulk_urb(dev->bulk_in_urb,
dev->udev,
usb_rcvbulkpipe(dev->udev,
dev->bulk_in_endpointAddr),
dev->bulk_in_buffer,
dev->bulk_in_size * 128,
ft60x_read_bulk_callback, dev);
}
/* tell everybody to leave the URB alone */
spin_lock_irq(&dev->err_lock);
dev->ongoing_read = 1;
spin_unlock_irq(&dev->err_lock);
/* submit bulk in urb, which means no data to deliver */
dev->bulk_in_filled = 0;
dev->bulk_in_copied = 0;
/* do it */
rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL);
if (rv < 0) {
dev_err(&dev->interface->dev,
"%s - failed submitting read urb, error %d\n",
__func__, rv);
rv = (rv == -ENOMEM) ? rv : -EIO;
spin_lock_irq(&dev->err_lock);
dev->ongoing_read = 0;
spin_unlock_irq(&dev->err_lock);
}
return rv;
}
static ssize_t ft60x_read(struct file *file, char *buffer, size_t count,
loff_t * ppos)
{
struct usb_ft60x *dev;
int rv;
bool ongoing_io;
//printk(KERN_INFO "IN_FUNCTION %s\n", __func__);
dev = file->private_data;
/* if we cannot read at all, return EOF */
if (!dev->bulk_in_urb || !count)
return 0;
/* no concurrent readers */
rv = mutex_lock_interruptible(&dev->io_mutex);
if (rv < 0)
return rv;
if (!dev->interface) { /* disconnect() was called */
rv = -ENODEV;
goto exit;
}
dev->done_reading = 0;
/* if IO is under way, we must not touch things */
retry:
spin_lock_irq(&dev->err_lock);
ongoing_io = dev->ongoing_read;
spin_unlock_irq(&dev->err_lock);
if (ongoing_io) {
/* nonblocking IO shall not wait */
if (file->f_flags & O_NONBLOCK) {
rv = -EAGAIN;
goto exit;
}
/*
* IO may take forever
* hence wait in an interruptible state
*/
rv = wait_event_interruptible(dev->bulk_in_wait,
(!dev->ongoing_read));
if (rv < 0)
goto exit;
}
/* errors must be reported */
rv = dev->errors;
if (rv == -ECONNRESET) {
dev->errors = 0;
if (!dev->bulk_in_filled) {
rv = ft60x_send_cmd_read(dev, count);
if (rv < 0)
goto exit;
printk(KERN_INFO "FROM here 1 %d \n",
dev->bulk_in_urb->actual_length);
rv = ft60x_do_read_io(dev, count);
if (rv < 0) {
goto exit;
} else
goto retry;
}
}
if ((rv < 0) && (rv != -ECONNRESET)) {
/* any error is reported once */
dev->errors = 0;
/* to preserve notifications about reset */
rv = (rv == -EPIPE) ? rv : -EIO;
/* report it */
goto exit;
}
/*
* if the buffer is filled we may satisfy the read
* else we need to start IO
*/
if (dev->bulk_in_filled) {
/* we had read data */
size_t available = dev->bulk_in_filled - dev->bulk_in_copied;
size_t chunk = min(available, count);
if (!available) {
/*
* all data has been used
* actual IO needs to be done
*/
rv = ft60x_do_read_io(dev, count);
if (rv < 0)
goto exit;
else
goto retry;
}
/*
* data is available
* chunk tells us how much shall be copied
*/
if (copy_to_user(buffer,
dev->bulk_in_buffer + dev->bulk_in_copied,
chunk))
rv = -EFAULT;
else {
rv = chunk;
}
dev->bulk_in_copied += chunk;
/*
* if we are asked for more than we have,
* we start IO but don't wait
*/
if (available < count) {
ft60x_do_read_io(dev, count - chunk);
}
} else {
/* no data in the buffer */
rv = ft60x_do_read_io(dev, count);
if (rv < 0)
goto exit;
else
goto retry;
}
exit:
dev->done_reading = 1;
mutex_unlock(&dev->io_mutex);
return rv;
}
static void ft60x_write_bulk_callback(struct urb *urb)
{
struct usb_ft60x *dev;
dev = urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status) {
if (!(urb->status == -ENOENT ||
urb->status == -ECONNRESET || urb->status == -ESHUTDOWN))
dev_err(&dev->interface->dev,
"%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
spin_lock(&dev->err_lock);
dev->busy_write = 0;
dev->errors = urb->status;
spin_unlock(&dev->err_lock);
wake_up_interruptible(&dev->bulk_out_wait);
}
/* free up our allocated buffer */
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
up(&dev->limit_sem);
}
static ssize_t ft60x_write(struct file *file, const char *user_buffer,
size_t count, loff_t * ppos)
{
struct usb_ft60x *dev;
int retval = 0;
struct urb *urb = NULL;
char *buf = NULL;
size_t writesize = min(count, (size_t) MAX_TRANSFER);
dev = file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
goto exit;
/*
* limit the number of URBs in flight to stop a user from using up all
* RAM
*/
if (!(file->f_flags & O_NONBLOCK)) {
if (down_interruptible(&dev->limit_sem)) {
retval = -ERESTARTSYS;
goto exit;
}
} else {
if (down_trylock(&dev->limit_sem)) {
retval = -EAGAIN;
goto exit;
}
}
spin_lock_irq(&dev->err_lock);
retval = dev->errors;
if (retval < 0) {
/* any error is reported once */
dev->errors = 0;
/* to preserve notifications about reset */
retval = (retval == -EPIPE) ? retval : -EIO;
}
spin_unlock_irq(&dev->err_lock);
if (retval < 0)
goto error;
/* create a urb, and a buffer for it, and copy the data to the urb */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
retval = -ENOMEM;
goto error;
}
buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
retval = -ENOMEM;
goto error;
}
if (copy_from_user(buf, user_buffer, writesize)) {
retval = -EFAULT;
goto error;
}
/* this lock makes sure we don't submit URBs to gone devices */
mutex_lock(&dev->io_mutex);
if (!dev->interface) { /* disconnect() was called */
mutex_unlock(&dev->io_mutex);
retval = -ENODEV;
goto error;
}
/* initialize the urb properly */
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev,
dev->bulk_out_endpointAddr), buf,
writesize, ft60x_write_bulk_callback, dev);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->submitted);
/* send the data out the bulk port */
retval = usb_submit_urb(urb, GFP_KERNEL);
mutex_unlock(&dev->io_mutex);
if (retval) {
dev_err(&dev->interface->dev,
"%s - failed submitting write urb, error %d\n",
__func__, retval);
goto error_unanchor;
}
spin_lock_irq(&dev->err_lock);
dev->busy_write = 1;
spin_unlock_irq(&dev->err_lock);
/*
* release our reference to this urb, the USB core will eventually free
* it entirely
*/
usb_free_urb(urb);
return writesize;
error_unanchor:
usb_unanchor_urb(urb);
error:
if (urb) {
usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma);
usb_free_urb(urb);
}
up(&dev->limit_sem);
exit:
return retval;
}
static long ft60x_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long retval = 0;
struct usb_ft60x *dev;
struct ft60x_config cfg;
dev = file->private_data;
if (!dev) {
retval = -ENODEV;
goto exit;
}
switch (cmd) {
case 0:
if (copy_to_user((unsigned char *)arg,
(unsigned char *)&dev->ft->ft60x_cfg,
sizeof(struct ft60x_config)))
retval = -EFAULT;
break;
case 1:
if (copy_from_user
(&cfg, (unsigned char *)arg, sizeof(struct ft60x_config))) {
retval = -EFAULT;
goto exit;
}
ft60x_set_config(dev->ft, &cfg);
break;
default:
printk(KERN_ERR "Unknown IOCTL %d\n", cmd);
}
exit:
return retval;
}
static const struct file_operations ft60x_fops = {
.owner = THIS_MODULE,
.read = ft60x_read,
.write = ft60x_write,
.open = ft60x_open,
.release = ft60x_release,
.flush = ft60x_flush,
.poll = ft60x_poll,
.unlocked_ioctl = ft60x_ioctl,
.llseek = noop_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 ft60x_class = {
.name = "ft60x%d",
.fops = &ft60x_fops,
.minor_base = USB_FT60X_MINOR_BASE,
};
static int ft60x_set_config(struct ft60x_device *ft,
struct ft60x_config *ft60x_cfg)
{
struct ft60x_config *cfg = NULL;
int ret;
if (!ft || !ft60x_cfg) {
ret = -EINVAL;
goto exit;
}
/* Make sure we are not sending the same thing because it'd disconnect us */
if (!memcmp(ft60x_cfg, &ft->ft60x_cfg, sizeof(struct ft60x_config))) {
return 0;
}
/* Changing configuration */
cfg = kmalloc(sizeof(struct ft60x_config), GFP_NOIO);
if (!cfg) {
ret = -ENOMEM;
goto exit;
}
memcpy(cfg, ft60x_cfg, sizeof(struct ft60x_config));
ret = usb_control_msg(ft->udev, usb_sndctrlpipe(ft->udev, 0),
0xcf, USB_TYPE_VENDOR | USB_DIR_OUT, 0, 0,
cfg, sizeof(struct ft60x_config),
USB_CTRL_SET_TIMEOUT);
if (ret < 0) {
ret = -EIO;
goto exit;
}
exit:
if (cfg)
kfree(cfg);
return ret;
}
static int ft60x_get_config(struct ft60x_device *ft)
{
struct ft60x_config *cfg = NULL;
int retval;
int ret;
if (!ft) {
retval = -EINVAL;
goto exit;
}
cfg = kmalloc(sizeof(struct ft60x_config), GFP_NOIO);
if (!cfg) {
retval = -ENOMEM;
goto exit;
}
ret = usb_control_msg(ft->udev, usb_rcvctrlpipe(ft->udev, 0),
0xcf, USB_TYPE_VENDOR | USB_DIR_IN, 1, 0,
cfg, sizeof(struct ft60x_config),
USB_CTRL_SET_TIMEOUT);
if (ret < 0) {
retval = -EIO;
goto exit;
}
if (ret <= sizeof(struct ft60x_config)) {
memcpy(&ft->ft60x_cfg, cfg, ret);
}
exit:
if (cfg) {
kfree(cfg);
}
return retval;
}
static int ft60x_get_unknown(struct ft60x_device *ft)
{
struct ft60x_config *cfg = NULL;
int retval;
int ret;
unsigned int *val = NULL;
if (!ft) {
retval = -EINVAL;
goto exit;
}
val = kmalloc(sizeof(unsigned int), GFP_NOIO);
if (!val) {
retval = -ENOMEM;
goto exit;
}
ret = usb_control_msg(ft->udev, usb_rcvctrlpipe(ft->udev, 0),
0xf1, USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
val, 4, USB_CTRL_SET_TIMEOUT);
if (ret < 0) {
retval = -EIO;
printk(KERN_ERR "GOT ERROR1: %d\n", retval);
goto exit;
}
exit:
if (val) {
kfree(cfg);
}
return retval;
}
static int ft60x_alloc_data_interface(struct usb_ft60x *dev,
struct usb_host_interface *iface_desc)
{
int i;
size_t buffer_size;
int retval = 0;
struct usb_endpoint_descriptor *endpoint;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->bulk_in_endpointAddr &&
usb_endpoint_is_bulk_in(endpoint)) {
/* we found a bulk in endpoint */
buffer_size = usb_endpoint_maxp(endpoint);
dev->bulk_in_size = buffer_size;