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staging: comedi: vmk80xx: simplify vmk80xx_reset_device() 

vmk80xx_reset_device() is called during initialization of a Velleman
K8055 (aka VM110) to send a reset command to the hardware.  The current
function is a bit long-winded and doesn't set the TRANS_OUT_BUSY flag to
prevent re-use of the transmit buffer while the URB is in progress.

Rewrite the function to use vmk80xx_write_packet() to send the command.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-02-14 16:42:14 +00:00 committed by Greg Kroah-Hartman
parent 0cbfc8269b
commit e8f311a5b6
1 changed files with 9 additions and 35 deletions
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44
drivers/staging/comedi/drivers/vmk80xx.c
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@ -277,41 +277,6 @@ static void vmk80xx_read_eeprom(struct vmk80xx_private *devpriv, int flag)
strncpy(devpriv->fw.ic6_vers, rx + 25, 24);
}
static int vmk80xx_reset_device(struct vmk80xx_private *devpriv)
{
struct usb_device *usb = devpriv->usb;
unsigned char *tx_buf = devpriv->usb_tx_buf;
struct urb *urb;
unsigned int tx_pipe;
int ival;
size_t size;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return -ENOMEM;
tx_pipe = usb_sndintpipe(usb, 0x01);
ival = devpriv->ep_tx->bInterval;
size = le16_to_cpu(devpriv->ep_tx->wMaxPacketSize);
tx_buf[0] = VMK8055_CMD_RST;
tx_buf[1] = 0x00;
tx_buf[2] = 0x00;
tx_buf[3] = 0x00;
tx_buf[4] = 0x00;
tx_buf[5] = 0x00;
tx_buf[6] = 0x00;
tx_buf[7] = 0x00;
usb_fill_int_urb(urb, usb, tx_pipe, tx_buf, size,
vmk80xx_tx_callback, devpriv, ival);
usb_anchor_urb(urb, &devpriv->tx_anchor);
return usb_submit_urb(urb, GFP_KERNEL);
}
static void vmk80xx_build_int_urb(struct urb *urb, int flag)
{
struct vmk80xx_private *devpriv = urb->context;
@ -468,6 +433,15 @@ exit:
return retval;
}
static int vmk80xx_reset_device(struct vmk80xx_private *devpriv)
{
size_t size;
size = le16_to_cpu(devpriv->ep_tx->wMaxPacketSize);
memset(devpriv->usb_tx_buf, 0, size);
return vmk80xx_write_packet(devpriv, VMK8055_CMD_RST);
}
#define DIR_IN 1
#define DIR_OUT 2