On Thu, May 15, 2014 at 03:56:41AM +0600, Alexander Bersenev wrote:
>This patch adds driver for sunxi IR controller.
>It is based on Alexsey Shestacov's work based on the original driver
>supplied by Allwinner.
>
...
>+static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id)
>+{
>+ unsigned long status;
>+ unsigned char dt;
>+ unsigned int cnt, rc;
>+ struct sunxi_ir *ir = dev_id;
>+ DEFINE_IR_RAW_EVENT(rawir);
>+
>+ spin_lock(&ir->ir_lock);
>+
>+ status = readl(ir->base + SUNXI_IR_RXSTA_REG);
>+
>+ /* clean all pending statuses */
>+ writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
>+
>+ if (status & REG_RXINT_RAI_EN) {
>+ /* How many messages in fifo */
>+ rc = (status >> REG_RXSTA_RAC__SHIFT) & REG_RXSTA_RAC__MASK;
>+ /* Sanity check */
>+ rc = rc > SUNXI_IR_FIFO_SIZE ? SUNXI_IR_FIFO_SIZE : rc;
>+ /* If we have data */
>+ for (cnt = 0; cnt < rc; cnt++) {
>+ /* for each bit in fifo */
>+ dt = readb(ir->base + SUNXI_IR_RXFIFO_REG);
>+ rawir.pulse = (dt & 0x80) != 0;
>+ rawir.duration = (dt & 0x7f) * SUNXI_IR_SAMPLE;
Can the hardware actually return a zero duration or should that be dt &
0x7f + 1?
(Not familiar with this particular hardware but I know I've seen that
behaviour before).
>+ ir_raw_event_store_with_filter(ir->rc, &rawir);
>+ }
>+ }
>+
>+ if (status & REG_RXINT_ROI_EN) {
>+ ir_raw_event_reset(ir->rc);
>+ } else if (status & REG_RXINT_RPEI_EN) {
>+ ir_raw_event_set_idle(ir->rc, true);
>+ ir_raw_event_handle(ir->rc);
>+ }
>+
>+ spin_unlock(&ir->ir_lock);
>+
>+ return IRQ_HANDLED;
>+}
....
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