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Date: Sat, 3 May 2014 10:53:17 -0700
From: Maxime Ripard <maxime.ripard@...e-electrons.com>
To: Alexander Bersenev <bay@...kerdom.ru>
Cc: linux-sunxi@...glegroups.com, david@...deman.nu,
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,
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 v5 2/3] ARM: sunxi: Add driver for sunxi IR controller
On Wed, Apr 30, 2014 at 09:16:49PM +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.
>
> Signed-off-by: Alexander Bersenev <bay@...kerdom.ru>
> Signed-off-by: Alexsey Shestacov <wingrime@...ux-sunxi.org>
> ---
> drivers/media/rc/Kconfig | 10 ++
> drivers/media/rc/Makefile | 1 +
> drivers/media/rc/sunxi-ir.c | 303 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 314 insertions(+)
> create mode 100644 drivers/media/rc/sunxi-ir.c
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index 8fbd377..9427fad 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -343,4 +343,14 @@ config RC_ST
>
> If you're not sure, select N here.
>
> +config IR_SUNXI
> + tristate "SUNXI IR remote control"
> + depends on RC_CORE
> + depends on ARCH_SUNXI
> + ---help---
> + Say Y if you want to use sunXi internal IR Controller
> +
> + To compile this driver as a module, choose M here: the module will
> + be called sunxi-ir.
> +
> endif #RC_DEVICES
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index f8b54ff..93cdbe9 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -32,4 +32,5 @@ obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o
> obj-$(CONFIG_IR_IGUANA) += iguanair.o
> obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o
> obj-$(CONFIG_RC_ST) += st_rc.o
> +obj-$(CONFIG_IR_SUNXI) += sunxi-ir.o
> obj-$(CONFIG_IR_IMG) += img-ir/
> diff --git a/drivers/media/rc/sunxi-ir.c b/drivers/media/rc/sunxi-ir.c
> new file mode 100644
> index 0000000..f051d94
> --- /dev/null
> +++ b/drivers/media/rc/sunxi-ir.c
> @@ -0,0 +1,303 @@
> +/*
> + * Driver for Allwinner sunXi IR controller
> + *
> + * Copyright (C) 2014 Alexsey Shestacov <wingrime@...ux-sunxi.org>
> + * Copyright (C) 2014 Alexander Bersenev <bay@...kerdom.ru>
> + *
> + * Based on sun5i-ir.c:
> + * Copyright (C) 2007-2012 Daniel Wang
> + * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <media/rc-core.h>
> +
> +#define SUNXI_IR_DEV "sunxi-ir"
> +
> +/* Registers */
> +/* IR Control */
> +#define SUNXI_IR_CTL_REG 0x00
> +/* Rx Config */
> +#define SUNXI_IR_RXCTL_REG 0x10
> +/* Rx Data */
> +#define SUNXI_IR_RXFIFO_REG 0x20
> +/* Rx Interrupt Enable */
> +#define SUNXI_IR_RXINT_REG 0x2C
> +/* Rx Interrupt Status */
> +#define SUNXI_IR_RXSTA_REG 0x30
> +/* IR Sample Config */
> +#define SUNXI_IR_CIR_REG 0x34
> +
> +/* Bit Definition of IR_RXINTS_REG Register */
> +#define SUNXI_IR_RXINTS_RXOF BIT(0) /* Rx FIFO Overflow */
> +#define SUNXI_IR_RXINTS_RXPE BIT(1) /* Rx Packet End */
> +#define SUNXI_IR_RXINTS_RXDA BIT(4) /* Rx FIFO Data Available */
> +/* Hardware supported fifo size */
> +#define SUNXI_IR_FIFO_SIZE 16
> +/* How much messages in fifo triggers IRQ */
> +#define SUNXI_IR_FIFO_TRIG 8
> +/* Required frequency for IR0 or IR1 clock in CIR mode */
> +#define SUNXI_IR_BASE_CLK 8000000
> +/* Frequency after IR internal divider */
> +#define SUNXI_IR_CLK (SUNXI_IR_BASE_CLK / 64)
> +/* Sample period in ns */
> +#define SUNXI_IR_SAMPLE (1000000000ul / SUNXI_IR_CLK)
> +/* Filter threshold in samples */
> +#define SUNXI_IR_RXFILT 1
> +/* Idle Threshold in samples */
> +#define SUNXI_IR_RXIDLE 20
> +/* Time after which device stops sending data in ms */
> +#define SUNXI_IR_TIMEOUT 120
> +
> +struct sunxi_ir {
> + spinlock_t ir_lock;
> + struct rc_dev *rc;
> + void __iomem *base;
> + int irq;
> + struct clk *clk;
> + struct clk *apb_clk;
> + const char *map_name;
> +};
> +
> +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_irq(&ir->ir_lock);
> +
> + status = readl(ir->base + SUNXI_IR_RXSTA_REG);
> +
> + /* clean all pending statuses */
> + writel(status | 0xff, ir->base + SUNXI_IR_RXSTA_REG);
> +
> + if (status & SUNXI_IR_RXINTS_RXDA) {
> + /* How much messages in fifo */
> + rc = (status >> 8) & 0x3f;
> + /* 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;
> + ir_raw_event_store_with_filter(ir->rc, &rawir);
> + }
> + }
> +
> + if (status & SUNXI_IR_RXINTS_RXOF)
> + ir_raw_event_reset(ir->rc);
> + else if (status & SUNXI_IR_RXINTS_RXPE) {
> + ir_raw_event_set_idle(ir->rc, true);
> + ir_raw_event_handle(ir->rc);
> + }
> +
> + spin_unlock_irq(&ir->ir_lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +
> +static int sunxi_ir_probe(struct platform_device *pdev)
> +{
> + int ret = 0;
> + unsigned long tmp = 0;
> +
> + struct device *dev = &pdev->dev;
> + struct device_node *dn = dev->of_node;
> + struct resource *res;
> + struct sunxi_ir *ir;
> +
> + ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL);
> + if (!ir)
> + return -ENOMEM;
> +
> + /* Clock */
> + ir->apb_clk = devm_clk_get(dev, "apb");
> + if (IS_ERR(ir->apb_clk)) {
> + dev_err(dev, "failed to get a apb clock.\n");
> + return -EINVAL;
> + }
> + ir->clk = devm_clk_get(dev, "ir");
> + if (IS_ERR(ir->clk)) {
> + dev_err(dev, "failed to get a ir clock.\n");
> + return -EINVAL;
> + }
> +
> + ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK);
> + if (ret) {
> + dev_err(dev, "set ir base clock failed!\n");
> + return -EINVAL;
> + }
> +
> + if (clk_prepare_enable(ir->apb_clk)) {
> + dev_err(dev, "try to enable apb_ir_clk failed\n");
> + return -EINVAL;
> + }
> +
> + if (clk_prepare_enable(ir->clk)) {
> + dev_err(dev, "try to enable ir_clk failed\n");
> + ret = -EINVAL;
> + goto exit_clkdisable_apb_clk;
> + }
> +
> + /* IO */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> + ir->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(ir->base)) {
> + dev_err(dev, "failed to map registers\n");
> + ret = -ENOMEM;
> + goto exit_clkdisable_clk;
> + }
> +
> + /* IRQ */
> + ir->irq = platform_get_irq(pdev, 0);
> + if (ir->irq < 0) {
> + dev_err(dev, "no irq resource\n");
> + ret = -EINVAL;
> + goto exit_clkdisable_clk;
> + }
> +
> + ret = devm_request_irq(dev, ir->irq, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir);
> + if (ret) {
> + dev_err(dev, "failed request irq\n");
> + ret = -EINVAL;
> + goto exit_clkdisable_clk;
> + }
> +
> + ir->rc = rc_allocate_device();
> +
> + if (!ir->rc) {
> + dev_err(dev, "failed to allocate device\n");
> + ret = -ENOMEM;
> + goto exit_clkdisable_clk;
> + }
> +
> + ir->rc->priv = ir;
> + ir->rc->input_name = SUNXI_IR_DEV;
> + ir->rc->input_phys = "sunxi-ir/input0";
> + ir->rc->input_id.bustype = BUS_HOST;
> + ir->rc->input_id.vendor = 0x0001;
> + ir->rc->input_id.product = 0x0001;
> + ir->rc->input_id.version = 0x0100;
> + ir->map_name = of_get_property(dn, "linux,rc-map-name", NULL);
> + ir->rc->map_name = ir->map_name ?: RC_MAP_EMPTY;
> + ir->rc->dev.parent = dev;
> + ir->rc->driver_type = RC_DRIVER_IR_RAW;
> + rc_set_allowed_protocols(ir->rc, RC_BIT_ALL);
> + ir->rc->rx_resolution = SUNXI_IR_SAMPLE;
> + ir->rc->timeout = MS_TO_NS(SUNXI_IR_TIMEOUT);
> + ir->rc->driver_name = SUNXI_IR_DEV;
> +
> + ret = rc_register_device(ir->rc);
> + if (ret) {
> + dev_err(dev, "failed to register rc device\n");
> + ret = -EINVAL;
> + goto exit_free_dev;
> + }
> +
> + platform_set_drvdata(pdev, ir);
> +
> + /* Enable CIR Mode */
> + writel(0x3 << 4, ir->base+SUNXI_IR_CTL_REG);
> +
> + /* Config IR Sample Register */
> + /* Fsample = clk */
> + tmp = 0;
> + /* Set Filter Threshold */
> + tmp |= (SUNXI_IR_RXFILT & 0x3f) << 2;
> + /* Set Idle Threshold */
> + tmp |= (SUNXI_IR_RXIDLE & 0xff) << 8;
> + writel(tmp, ir->base + SUNXI_IR_CIR_REG);
> +
> + /* Invert Input Signal */
> + writel(0x1 << 2, ir->base + SUNXI_IR_RXCTL_REG);
> +
> + /* Clear All Rx Interrupt Status */
> + writel(0xff, ir->base + SUNXI_IR_RXSTA_REG);
> +
> + /* Enable IRQ on data, overflow, packed end */
> + tmp = (0x1 << 4) | 0x3;
> +
> + /* Rx FIFO Threshold */
> + tmp |= (SUNXI_IR_FIFO_TRIG - 1) << 8;
> +
> + writel(tmp, ir->base + SUNXI_IR_RXINT_REG);
> +
> + /* Enable IR Module */
> + tmp = readl(ir->base + SUNXI_IR_CTL_REG);
> +
> + writel(tmp | 0x3, ir->base + SUNXI_IR_CTL_REG);
We don't like magic numbers too much. Please add some #define for
those.
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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