int omap3isp_stat_init(struct ispstat *stat, const char *name,
const struct v4l2_subdev_ops *sd_ops)
{
stat->buf = kcalloc(STAT_MAX_BUFS, sizeof(*stat->buf), GFP_KERNEL);
if (!stat->buf)
return -ENOMEM;
isp_stat_buf_clear(stat);
mutex_init(&stat->ioctl_lock);
atomic_set(&stat->buf_err, 0);
return isp_stat_init_entities(stat, name, sd_ops);
}
/*
* omap3isp_stat_enable - Disable/Enable statistic engine as soon as possible
* @enable: 0/1 - Disables/Enables the engine.
*
* Client should configure all the module registers before this.
* This function can be called from a userspace request.
*/
int omap3isp_stat_enable(struct ispstat *stat, u8 enable)
{
unsigned long irqflags;
dev_dbg(stat->isp->dev, "%s: user wants to %s module.\n",
stat->subdev.name, enable ? "enable" : "disable");
/* Prevent enabling while configuring */
mutex_lock(&stat->ioctl_lock);
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
if (!stat->configured && enable) {
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
mutex_unlock(&stat->ioctl_lock);
dev_dbg(stat->isp->dev, "%s: cannot enable module as it's "
"never been successfully configured so far.\n",
stat->subdev.name);
return -EINVAL;
}
if (enable) {
if (stat->state == ISPSTAT_DISABLING)
/* Previous disabling request wasn't done yet */
stat->state = ISPSTAT_ENABLED;
else if (stat->state == ISPSTAT_DISABLED)
/* Module is now being enabled */
stat->state = ISPSTAT_ENABLING;
} else {
if (stat->state == ISPSTAT_ENABLING) {
/* Previous enabling request wasn't done yet */
stat->state = ISPSTAT_DISABLED;
} else if (stat->state == ISPSTAT_ENABLED) {
/* Module is now being disabled */
stat->state = ISPSTAT_DISABLING;
isp_stat_buf_clear(stat);
}
}
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
mutex_unlock(&stat->ioctl_lock);
return 0;
}
