linux-kernel - Re: [PATCH v7 2/3] [media] rc: add sunxi-ir driver

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Date:	Mon, 19 May 2014 22:26:16 +0200
From:	David Härdeman <david@...deman.nu>
To:	Alexander Bersenev <bay@...kerdom.ru>
Cc:	linux-sunxi@...glegroups.com, devicetree@...r.kernel.org,
	galak@...eaurora.org, grant.likely@...aro.org,
	ijc+devicetree@...lion.org.uk, james.hogan@...tec.com,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	m.chehab@...sung.com, mark.rutland@....com,
	maxime.ripard@...e-electrons.com, pawel.moll@....com,
	rdunlap@...radead.org, robh+dt@...nel.org, sean@...s.org,
	srinivas.kandagatla@...com, wingrime@...ux-sunxi.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: Re: [PATCH v7 2/3] [media] rc: add sunxi-ir driver

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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