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uru4000: retry scanner powerup 3 times

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When we include the await_finger_off procedure (i.e. set mode 12), the
current power-up code is unreliable - no 56aa interrupt arrives sometimes.
Comparing the F0 data and hwstat at this point between a working and a
non-working run yields no differences.

Work around this issue by retrying power-on 3 times.
This commit is contained in:
Daniel Drake 2007-11-04 19:01:15 +00:00
parent cbe1111e4e
commit f733ddcc3b
1 changed files with 20 additions and 12 deletions
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28
libfprint/drivers/uru4000.c
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@ -188,8 +188,10 @@ static int get_irq(struct fp_img_dev *dev, unsigned char *buf, int timeout)
int r;
int infinite_timeout = 0;
if (timeout == 0)
if (timeout == 0) {
infinite_timeout = 1;
timeout = 1000;
}
/* Darwin and Linux behave inconsistently with regard to infinite timeouts.
* Linux accepts a timeout value of 0 as infinite timeout, whereas darwin
@ -198,15 +200,12 @@ static int get_irq(struct fp_img_dev *dev, unsigned char *buf, int timeout)
* See http://thread.gmane.org/gmane.comp.lib.libusb.devel.general/1315 */
retry:
r = usb_interrupt_read(dev->udev, EP_INTR, buf, IRQ_LENGTH, 1000);
if (r == -ETIMEDOUT &&
((!infinite_timeout && timeout > 0) || infinite_timeout)) {
fp_dbg("timeout, retry");
timeout--;
r = usb_interrupt_read(dev->udev, EP_INTR, buf, IRQ_LENGTH, timeout);
if (r == -ETIMEDOUT && infinite_timeout)
goto retry;
}
if (r < 0) {
if (r != -ETIMEDOUT)
fp_err("interrupt read failed, error %d", r);
return r;
} else if (r < IRQ_LENGTH) {
@ -367,6 +366,7 @@ static int do_init(struct fp_img_dev *dev)
{
unsigned char status;
unsigned char tmp;
int timeouts = 0;
int i;
int r;
@ -440,10 +440,18 @@ retry:
return -EIO;
}
r = get_irq_with_type(dev, IRQDATA_SCANPWR_ON, 5);
if (r == GET_IRQ_OVERFLOW)
r = get_irq_with_type(dev, IRQDATA_SCANPWR_ON, 400);
if (r == GET_IRQ_OVERFLOW) {
goto retry;
else
} else if (r == -ETIMEDOUT) {
timeouts++;
if (timeouts <= 3) {
fp_dbg("scan power up timeout, retrying...");
goto retry;
} else {
fp_err("could not power up scanner after 3 attempts");
}
}
return r;
}