drivers/media/rc/ir-hix5hd2.c - vendor/opensource/backports - Git at Google

 /*
  * Copyright (c) 2014 Linaro Ltd.
  * Copyright (c) 2014 Hisilicon Limited.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <media/rc-core.h>
 #include <linux/of.h>

 /* Allow the driver to compile on all architectures */
 #ifndef writel_relaxed
 # define writel_relaxed writel
 #endif
 #ifndef readl_relaxed
 # define readl_relaxed readl
 #endif

 #define IR_ENABLE		0x00
 #define IR_CONFIG		0x04
 #define CNT_LEADS		0x08
 #define CNT_LEADE		0x0c
 #define CNT_SLEADE		0x10
 #define CNT0_B			0x14
 #define CNT1_B			0x18
 #define IR_BUSY			0x1c
 #define IR_DATAH		0x20
 #define IR_DATAL		0x24
 #define IR_INTM			0x28
 #define IR_INTS			0x2c
 #define IR_INTC			0x30
 #define IR_START		0x34

 /* interrupt mask */
 #define INTMS_SYMBRCV		(BIT(24) | BIT(8))
 #define INTMS_TIMEOUT		(BIT(25) | BIT(9))
 #define INTMS_OVERFLOW		(BIT(26) | BIT(10))
 #define INT_CLR_OVERFLOW	BIT(18)
 #define INT_CLR_TIMEOUT		BIT(17)
 #define INT_CLR_RCV		BIT(16)
 #define INT_CLR_RCVTIMEOUT	(BIT(16) | BIT(17))

 #define IR_CLK			0x48
 #define IR_CLK_ENABLE		BIT(4)
 #define IR_CLK_RESET		BIT(5)

 #define IR_CFG_WIDTH_MASK	0xffff
 #define IR_CFG_WIDTH_SHIFT	16
 #define IR_CFG_FORMAT_MASK	0x3
 #define IR_CFG_FORMAT_SHIFT	14
 #define IR_CFG_INT_LEVEL_MASK	0x3f
 #define IR_CFG_INT_LEVEL_SHIFT	8
 /* only support raw mode */
 #define IR_CFG_MODE_RAW		BIT(7)
 #define IR_CFG_FREQ_MASK	0x7f
 #define IR_CFG_FREQ_SHIFT	0
 #define IR_CFG_INT_THRESHOLD	1
 /* symbol start from low to high, symbol stream end at high*/
 #define IR_CFG_SYMBOL_FMT	0
 #define IR_CFG_SYMBOL_MAXWIDTH	0x3e80

 #define IR_HIX5HD2_NAME		"hix5hd2-ir"

 struct hix5hd2_ir_priv {
 	int			irq;
 	void volatile __iomem	*base;
 	struct device		*dev;
 	struct rc_dev		*rdev;
 	struct regmap		*regmap;
 	struct clk		*clock;
 	unsigned long		rate;
 };

 static void hix5hd2_ir_enable(struct hix5hd2_ir_priv *dev, bool on)
 {
 	u32 val;

 	regmap_read(dev->regmap, IR_CLK, &val);
 	if (on) {
 		val &= ~IR_CLK_RESET;
 		val |= IR_CLK_ENABLE;
 	} else {
 		val &= ~IR_CLK_ENABLE;
 		val |= IR_CLK_RESET;
 	}
 	regmap_write(dev->regmap, IR_CLK, val);
 }

 static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv)
 {
 	int timeout = 10000;
 	u32 val, rate;

 	writel_relaxed(0x01, priv->base + IR_ENABLE);
 	while (readl_relaxed(priv->base + IR_BUSY)) {
 		if (timeout--) {
 			udelay(1);
 		} else {
 			dev_err(priv->dev, "IR_BUSY timeout\n");
 			return -ETIMEDOUT;
 		}
 	}

 	/* Now only support raw mode, with symbol start from low to high */
 	rate = DIV_ROUND_CLOSEST(priv->rate, 1000000);
 	val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT;
 	val |= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT;
 	val |= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK
 	       << IR_CFG_INT_LEVEL_SHIFT;
 	val |= IR_CFG_MODE_RAW;
 	val |= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT;
 	writel_relaxed(val, priv->base + IR_CONFIG);

 	writel_relaxed(0x00, priv->base + IR_INTM);
 	/* write arbitrary value to start  */
 	writel_relaxed(0x01, priv->base + IR_START);
 	return 0;
 }

 static int hix5hd2_ir_open(struct rc_dev *rdev)
 {
 	struct hix5hd2_ir_priv *priv = rdev->priv;

 	hix5hd2_ir_enable(priv, true);
 	return hix5hd2_ir_config(priv);
 }

 static void hix5hd2_ir_close(struct rc_dev *rdev)
 {
 	struct hix5hd2_ir_priv *priv = rdev->priv;

 	hix5hd2_ir_enable(priv, false);
 }

 static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data)
 {
 	u32 symb_num, symb_val, symb_time;
 	u32 data_l, data_h;
 	u32 irq_sr, i;
 	struct hix5hd2_ir_priv *priv = data;

 	irq_sr = readl_relaxed(priv->base + IR_INTS);
 	if (irq_sr & INTMS_OVERFLOW) {
 		/*
 		 * we must read IR_DATAL first, then we can clean up
 		 * IR_INTS availably since logic would not clear
 		 * fifo when overflow, drv do the job
 		 */
 		ir_raw_event_reset(priv->rdev);
 		symb_num = readl_relaxed(priv->base + IR_DATAH);
 		for (i = 0; i < symb_num; i++)
 			readl_relaxed(priv->base + IR_DATAL);

 		writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC);
 		dev_info(priv->dev, "overflow, level=%d\n",
 			 IR_CFG_INT_THRESHOLD);
 	}

 	if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) {
 		DEFINE_IR_RAW_EVENT(ev);

 		symb_num = readl_relaxed(priv->base + IR_DATAH);
 		for (i = 0; i < symb_num; i++) {
 			symb_val = readl_relaxed(priv->base + IR_DATAL);
 			data_l = ((symb_val & 0xffff) * 10);
 			data_h =  ((symb_val >> 16) & 0xffff) * 10;
 			symb_time = (data_l + data_h) / 10;

 			ev.duration = US_TO_NS(data_l);
 			ev.pulse = true;
 			ir_raw_event_store(priv->rdev, &ev);

 			if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) {
 				ev.duration = US_TO_NS(data_h);
 				ev.pulse = false;
 				ir_raw_event_store(priv->rdev, &ev);
 			} else {
 				ir_raw_event_set_idle(priv->rdev, true);
 			}
 		}

 		if (irq_sr & INTMS_SYMBRCV)
 			writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC);
 		if (irq_sr & INTMS_TIMEOUT)
 			writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC);
 	}

 	/* Empty software fifo */
 	ir_raw_event_handle(priv->rdev);
 	return IRQ_HANDLED;
 }

 static int hix5hd2_ir_probe(struct platform_device *pdev)
 {
 	struct rc_dev *rdev;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct hix5hd2_ir_priv *priv;
 	struct device_node *node = pdev->dev.of_node;
 	const char *map_name;
 	int ret;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->regmap = syscon_regmap_lookup_by_phandle(node,
 						       "hisilicon,power-syscon");
 	if (IS_ERR(priv->regmap)) {
 		dev_err(dev, "no power-reg\n");
 		return -EINVAL;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->base = devm_ioremap_resource(dev, res);
 	if (IS_ERR((__force void *)priv->base))
 		return PTR_ERR((__force void *)priv->base);

 	priv->irq = platform_get_irq(pdev, 0);
 	if (priv->irq < 0) {
 		dev_err(dev, "irq can not get\n");
 		return priv->irq;
 	}

 	rdev = rc_allocate_device();
 	if (!rdev)
 		return -ENOMEM;

 	priv->clock = devm_clk_get(dev, NULL);
 	if (IS_ERR(priv->clock)) {
 		dev_err(dev, "clock not found\n");
 		ret = PTR_ERR(priv->clock);
 		goto err;
 	}
 	clk_prepare_enable(priv->clock);
 	priv->rate = clk_get_rate(priv->clock);

 	rdev->driver_type = RC_DRIVER_IR_RAW;
 	rdev->allowed_protocols = RC_BIT_ALL;
 	rdev->priv = priv;
 	rdev->open = hix5hd2_ir_open;
 	rdev->close = hix5hd2_ir_close;
 	rdev->driver_name = IR_HIX5HD2_NAME;
 	map_name = of_get_property(node, "linux,rc-map-name", NULL);
 	rdev->map_name = map_name ?: RC_MAP_EMPTY;
 	rdev->input_name = IR_HIX5HD2_NAME;
 	rdev->input_phys = IR_HIX5HD2_NAME "/input0";
 	rdev->input_id.bustype = BUS_HOST;
 	rdev->input_id.vendor = 0x0001;
 	rdev->input_id.product = 0x0001;
 	rdev->input_id.version = 0x0100;
 	rdev->rx_resolution = US_TO_NS(10);
 	rdev->timeout = US_TO_NS(IR_CFG_SYMBOL_MAXWIDTH * 10);

 	ret = rc_register_device(rdev);
 	if (ret < 0)
 		goto clkerr;

 	if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt,
 			     IRQF_NO_SUSPEND, pdev->name, priv) < 0) {
 		dev_err(dev, "IRQ %d register failed\n", priv->irq);
 		ret = -EINVAL;
 		goto regerr;
 	}

 	priv->rdev = rdev;
 	priv->dev = dev;
 	platform_set_drvdata(pdev, priv);

 	return ret;

 regerr:
 	rc_unregister_device(rdev);
 	rdev = NULL;
 clkerr:
 	clk_disable_unprepare(priv->clock);
 err:
 	rc_free_device(rdev);
 	dev_err(dev, "Unable to register device (%d)\n", ret);
 	return ret;
 }

 static int hix5hd2_ir_remove(struct platform_device *pdev)
 {
 	struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev);

 	clk_disable_unprepare(priv->clock);
 	rc_unregister_device(priv->rdev);
 	return 0;
 }

 #ifdef CONFIG_PM
 static int hix5hd2_ir_suspend(struct device *dev)
 {
 	struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);

 	clk_disable_unprepare(priv->clock);
 	hix5hd2_ir_enable(priv, false);

 	return 0;
 }

 static int hix5hd2_ir_resume(struct device *dev)
 {
 	struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);

 	hix5hd2_ir_enable(priv, true);
 	clk_prepare_enable(priv->clock);

 	writel_relaxed(0x01, priv->base + IR_ENABLE);
 	writel_relaxed(0x00, priv->base + IR_INTM);
 	writel_relaxed(0xff, priv->base + IR_INTC);
 	writel_relaxed(0x01, priv->base + IR_START);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend,
 			 hix5hd2_ir_resume);

 static struct of_device_id hix5hd2_ir_table[] = {
 	{ .compatible = "hisilicon,hix5hd2-ir", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, hix5hd2_ir_table);

 static struct platform_driver hix5hd2_ir_driver = {
 	.driver = {
 		.name = IR_HIX5HD2_NAME,
 		.of_match_table = hix5hd2_ir_table,
 		.pm     = &hix5hd2_ir_pm_ops,
 	},
 	.probe = hix5hd2_ir_probe,
 	.remove = hix5hd2_ir_remove,
 };

 module_platform_driver(hix5hd2_ir_driver);

 MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms");
 MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:hix5hd2-ir");
	/*
	* Copyright (c) 2014 Linaro Ltd.
	* Copyright (c) 2014 Hisilicon Limited.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/syscon.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>
	#include <media/rc-core.h>
	#include <linux/of.h>

	/* Allow the driver to compile on all architectures */
	#ifndef writel_relaxed
	# define writel_relaxed writel
	#endif
	#ifndef readl_relaxed
	# define readl_relaxed readl
	#endif

	#define IR_ENABLE 0x00
	#define IR_CONFIG 0x04
	#define CNT_LEADS 0x08
	#define CNT_LEADE 0x0c
	#define CNT_SLEADE 0x10
	#define CNT0_B 0x14
	#define CNT1_B 0x18
	#define IR_BUSY 0x1c
	#define IR_DATAH 0x20
	#define IR_DATAL 0x24
	#define IR_INTM 0x28
	#define IR_INTS 0x2c
	#define IR_INTC 0x30
	#define IR_START 0x34

	/* interrupt mask */
	#define INTMS_SYMBRCV (BIT(24) \| BIT(8))
	#define INTMS_TIMEOUT (BIT(25) \| BIT(9))
	#define INTMS_OVERFLOW (BIT(26) \| BIT(10))
	#define INT_CLR_OVERFLOW BIT(18)
	#define INT_CLR_TIMEOUT BIT(17)
	#define INT_CLR_RCV BIT(16)
	#define INT_CLR_RCVTIMEOUT (BIT(16) \| BIT(17))

	#define IR_CLK 0x48
	#define IR_CLK_ENABLE BIT(4)
	#define IR_CLK_RESET BIT(5)

	#define IR_CFG_WIDTH_MASK 0xffff
	#define IR_CFG_WIDTH_SHIFT 16
	#define IR_CFG_FORMAT_MASK 0x3
	#define IR_CFG_FORMAT_SHIFT 14
	#define IR_CFG_INT_LEVEL_MASK 0x3f
	#define IR_CFG_INT_LEVEL_SHIFT 8
	/* only support raw mode */
	#define IR_CFG_MODE_RAW BIT(7)
	#define IR_CFG_FREQ_MASK 0x7f
	#define IR_CFG_FREQ_SHIFT 0
	#define IR_CFG_INT_THRESHOLD 1
	/* symbol start from low to high, symbol stream end at high*/
	#define IR_CFG_SYMBOL_FMT 0
	#define IR_CFG_SYMBOL_MAXWIDTH 0x3e80

	#define IR_HIX5HD2_NAME "hix5hd2-ir"

	struct hix5hd2_ir_priv {
	int irq;
	void volatile __iomem *base;
	struct device *dev;
	struct rc_dev *rdev;
	struct regmap *regmap;
	struct clk *clock;
	unsigned long rate;
	};

	static void hix5hd2_ir_enable(struct hix5hd2_ir_priv *dev, bool on)
	{
	u32 val;

	regmap_read(dev->regmap, IR_CLK, &val);
	if (on) {
	val &= ~IR_CLK_RESET;
	val \|= IR_CLK_ENABLE;
	} else {
	val &= ~IR_CLK_ENABLE;
	val \|= IR_CLK_RESET;
	}
	regmap_write(dev->regmap, IR_CLK, val);
	}

	static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv)
	{
	int timeout = 10000;
	u32 val, rate;

	writel_relaxed(0x01, priv->base + IR_ENABLE);
	while (readl_relaxed(priv->base + IR_BUSY)) {
	if (timeout--) {
	udelay(1);
	} else {
	dev_err(priv->dev, "IR_BUSY timeout\n");
	return -ETIMEDOUT;
	}
	}

	/* Now only support raw mode, with symbol start from low to high */
	rate = DIV_ROUND_CLOSEST(priv->rate, 1000000);
	val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT;
	val \|= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT;
	val \|= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK
	<< IR_CFG_INT_LEVEL_SHIFT;
	val \|= IR_CFG_MODE_RAW;
	val \|= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT;
	writel_relaxed(val, priv->base + IR_CONFIG);

	writel_relaxed(0x00, priv->base + IR_INTM);
	/* write arbitrary value to start */
	writel_relaxed(0x01, priv->base + IR_START);
	return 0;
	}

	static int hix5hd2_ir_open(struct rc_dev *rdev)
	{
	struct hix5hd2_ir_priv *priv = rdev->priv;

	hix5hd2_ir_enable(priv, true);
	return hix5hd2_ir_config(priv);
	}

	static void hix5hd2_ir_close(struct rc_dev *rdev)
	{
	struct hix5hd2_ir_priv *priv = rdev->priv;

	hix5hd2_ir_enable(priv, false);
	}

	static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data)
	{
	u32 symb_num, symb_val, symb_time;
	u32 data_l, data_h;
	u32 irq_sr, i;
	struct hix5hd2_ir_priv *priv = data;

	irq_sr = readl_relaxed(priv->base + IR_INTS);
	if (irq_sr & INTMS_OVERFLOW) {
	/*
	* we must read IR_DATAL first, then we can clean up
	* IR_INTS availably since logic would not clear
	* fifo when overflow, drv do the job
	*/
	ir_raw_event_reset(priv->rdev);
	symb_num = readl_relaxed(priv->base + IR_DATAH);
	for (i = 0; i < symb_num; i++)
	readl_relaxed(priv->base + IR_DATAL);

	writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC);
	dev_info(priv->dev, "overflow, level=%d\n",
	IR_CFG_INT_THRESHOLD);
	}

	if ((irq_sr & INTMS_SYMBRCV) \|\| (irq_sr & INTMS_TIMEOUT)) {
	DEFINE_IR_RAW_EVENT(ev);

	symb_num = readl_relaxed(priv->base + IR_DATAH);
	for (i = 0; i < symb_num; i++) {
	symb_val = readl_relaxed(priv->base + IR_DATAL);
	data_l = ((symb_val & 0xffff) * 10);
	data_h = ((symb_val >> 16) & 0xffff) * 10;
	symb_time = (data_l + data_h) / 10;

	ev.duration = US_TO_NS(data_l);
	ev.pulse = true;
	ir_raw_event_store(priv->rdev, &ev);

	if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) {
	ev.duration = US_TO_NS(data_h);
	ev.pulse = false;
	ir_raw_event_store(priv->rdev, &ev);
	} else {
	ir_raw_event_set_idle(priv->rdev, true);
	}
	}

	if (irq_sr & INTMS_SYMBRCV)
	writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC);
	if (irq_sr & INTMS_TIMEOUT)
	writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC);
	}

	/* Empty software fifo */
	ir_raw_event_handle(priv->rdev);
	return IRQ_HANDLED;
	}

	static int hix5hd2_ir_probe(struct platform_device *pdev)
	{
	struct rc_dev *rdev;
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct hix5hd2_ir_priv *priv;
	struct device_node *node = pdev->dev.of_node;
	const char *map_name;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->regmap = syscon_regmap_lookup_by_phandle(node,
	"hisilicon,power-syscon");
	if (IS_ERR(priv->regmap)) {
	dev_err(dev, "no power-reg\n");
	return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(dev, res);
	if (IS_ERR((__force void *)priv->base))
	return PTR_ERR((__force void *)priv->base);

	priv->irq = platform_get_irq(pdev, 0);
	if (priv->irq < 0) {
	dev_err(dev, "irq can not get\n");
	return priv->irq;
	}

	rdev = rc_allocate_device();
	if (!rdev)
	return -ENOMEM;

	priv->clock = devm_clk_get(dev, NULL);
	if (IS_ERR(priv->clock)) {
	dev_err(dev, "clock not found\n");
	ret = PTR_ERR(priv->clock);
	goto err;
	}
	clk_prepare_enable(priv->clock);
	priv->rate = clk_get_rate(priv->clock);

	rdev->driver_type = RC_DRIVER_IR_RAW;
	rdev->allowed_protocols = RC_BIT_ALL;
	rdev->priv = priv;
	rdev->open = hix5hd2_ir_open;
	rdev->close = hix5hd2_ir_close;
	rdev->driver_name = IR_HIX5HD2_NAME;
	map_name = of_get_property(node, "linux,rc-map-name", NULL);
	rdev->map_name = map_name ?: RC_MAP_EMPTY;
	rdev->input_name = IR_HIX5HD2_NAME;
	rdev->input_phys = IR_HIX5HD2_NAME "/input0";
	rdev->input_id.bustype = BUS_HOST;
	rdev->input_id.vendor = 0x0001;
	rdev->input_id.product = 0x0001;
	rdev->input_id.version = 0x0100;
	rdev->rx_resolution = US_TO_NS(10);
	rdev->timeout = US_TO_NS(IR_CFG_SYMBOL_MAXWIDTH * 10);

	ret = rc_register_device(rdev);
	if (ret < 0)
	goto clkerr;

	if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt,
	IRQF_NO_SUSPEND, pdev->name, priv) < 0) {
	dev_err(dev, "IRQ %d register failed\n", priv->irq);
	ret = -EINVAL;
	goto regerr;
	}

	priv->rdev = rdev;
	priv->dev = dev;
	platform_set_drvdata(pdev, priv);

	return ret;

	regerr:
	rc_unregister_device(rdev);
	rdev = NULL;
	clkerr:
	clk_disable_unprepare(priv->clock);
	err:
	rc_free_device(rdev);
	dev_err(dev, "Unable to register device (%d)\n", ret);
	return ret;
	}

	static int hix5hd2_ir_remove(struct platform_device *pdev)
	{
	struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev);

	clk_disable_unprepare(priv->clock);
	rc_unregister_device(priv->rdev);
	return 0;
	}

	#ifdef CONFIG_PM
	static int hix5hd2_ir_suspend(struct device *dev)
	{
	struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);

	clk_disable_unprepare(priv->clock);
	hix5hd2_ir_enable(priv, false);

	return 0;
	}

	static int hix5hd2_ir_resume(struct device *dev)
	{
	struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);

	hix5hd2_ir_enable(priv, true);
	clk_prepare_enable(priv->clock);

	writel_relaxed(0x01, priv->base + IR_ENABLE);
	writel_relaxed(0x00, priv->base + IR_INTM);
	writel_relaxed(0xff, priv->base + IR_INTC);
	writel_relaxed(0x01, priv->base + IR_START);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend,
	hix5hd2_ir_resume);

	static struct of_device_id hix5hd2_ir_table[] = {
	{ .compatible = "hisilicon,hix5hd2-ir", },
	{},
	};
	MODULE_DEVICE_TABLE(of, hix5hd2_ir_table);

	static struct platform_driver hix5hd2_ir_driver = {
	.driver = {
	.name = IR_HIX5HD2_NAME,
	.of_match_table = hix5hd2_ir_table,
	.pm = &hix5hd2_ir_pm_ops,
	},
	.probe = hix5hd2_ir_probe,
	.remove = hix5hd2_ir_remove,
	};

	module_platform_driver(hix5hd2_ir_driver);

	MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms");
	MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:hix5hd2-ir");