drivers/mfd/jz4740-adc.c - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  * JZ4740 SoC ADC driver
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * This driver synchronizes access to the JZ4740 ADC core between the
  * JZ4740 battery and hwmon drivers.
  */

 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>

 #include <linux/clk.h>
 #include <linux/mfd/core.h>

 #include <linux/jz4740-adc.h>


 #define JZ_REG_ADC_ENABLE	0x00
 #define JZ_REG_ADC_CFG		0x04
 #define JZ_REG_ADC_CTRL		0x08
 #define JZ_REG_ADC_STATUS	0x0c

 #define JZ_REG_ADC_TOUCHSCREEN_BASE	0x10
 #define JZ_REG_ADC_BATTERY_BASE	0x1c
 #define JZ_REG_ADC_HWMON_BASE	0x20

 #define JZ_ADC_ENABLE_TOUCH	BIT(2)
 #define JZ_ADC_ENABLE_BATTERY	BIT(1)
 #define JZ_ADC_ENABLE_ADCIN	BIT(0)

 enum {
 	JZ_ADC_IRQ_ADCIN = 0,
 	JZ_ADC_IRQ_BATTERY,
 	JZ_ADC_IRQ_TOUCH,
 	JZ_ADC_IRQ_PENUP,
 	JZ_ADC_IRQ_PENDOWN,
 };

 struct jz4740_adc {
 	struct resource *mem;
 	void __iomem *base;

 	int irq;
 	int irq_base;

 	struct clk *clk;
 	atomic_t clk_ref;

 	spinlock_t lock;
 };

 static inline void jz4740_adc_irq_set_masked(struct jz4740_adc *adc, int irq,
 	bool masked)
 {
 	unsigned long flags;
 	uint8_t val;

 	irq -= adc->irq_base;

 	spin_lock_irqsave(&adc->lock, flags);

 	val = readb(adc->base + JZ_REG_ADC_CTRL);
 	if (masked)
 		val |= BIT(irq);
 	else
 		val &= ~BIT(irq);
 	writeb(val, adc->base + JZ_REG_ADC_CTRL);

 	spin_unlock_irqrestore(&adc->lock, flags);
 }

 static void jz4740_adc_irq_mask(struct irq_data *data)
 {
 	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
 	jz4740_adc_irq_set_masked(adc, data->irq, true);
 }

 static void jz4740_adc_irq_unmask(struct irq_data *data)
 {
 	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
 	jz4740_adc_irq_set_masked(adc, data->irq, false);
 }

 static void jz4740_adc_irq_ack(struct irq_data *data)
 {
 	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
 	unsigned int irq = data->irq - adc->irq_base;
 	writeb(BIT(irq), adc->base + JZ_REG_ADC_STATUS);
 }

 static struct irq_chip jz4740_adc_irq_chip = {
 	.name = "jz4740-adc",
 	.irq_mask = jz4740_adc_irq_mask,
 	.irq_unmask = jz4740_adc_irq_unmask,
 	.irq_ack = jz4740_adc_irq_ack,
 };

 static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
 {
 	struct jz4740_adc *adc = get_irq_desc_data(desc);
 	uint8_t status;
 	unsigned int i;

 	status = readb(adc->base + JZ_REG_ADC_STATUS);

 	for (i = 0; i < 5; ++i) {
 		if (status & BIT(i))
 			generic_handle_irq(adc->irq_base + i);
 	}
 }


 /* Refcounting for the ADC clock is done in here instead of in the clock
  * framework, because it is the only clock which is shared between multiple
  * devices and thus is the only clock which needs refcounting */
 static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
 {
 	if (atomic_inc_return(&adc->clk_ref) == 1)
 		clk_enable(adc->clk);
 }

 static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
 {
 	if (atomic_dec_return(&adc->clk_ref) == 0)
 		clk_disable(adc->clk);
 }

 static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
 	bool enabled)
 {
 	unsigned long flags;
 	uint8_t val;

 	spin_lock_irqsave(&adc->lock, flags);

 	val = readb(adc->base + JZ_REG_ADC_ENABLE);
 	if (enabled)
 		val |= BIT(engine);
 	else
 		val &= ~BIT(engine);
 	writeb(val, adc->base + JZ_REG_ADC_ENABLE);

 	spin_unlock_irqrestore(&adc->lock, flags);
 }

 static int jz4740_adc_cell_enable(struct platform_device *pdev)
 {
 	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);

 	jz4740_adc_clk_enable(adc);
 	jz4740_adc_set_enabled(adc, pdev->id, true);

 	return 0;
 }

 static int jz4740_adc_cell_disable(struct platform_device *pdev)
 {
 	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);

 	jz4740_adc_set_enabled(adc, pdev->id, false);
 	jz4740_adc_clk_disable(adc);

 	return 0;
 }

 int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
 {
 	struct jz4740_adc *adc = dev_get_drvdata(dev);
 	unsigned long flags;
 	uint32_t cfg;

 	if (!adc)
 		return -ENODEV;

 	spin_lock_irqsave(&adc->lock, flags);

 	cfg = readl(adc->base + JZ_REG_ADC_CFG);

 	cfg &= ~mask;
 	cfg |= val;

 	writel(cfg, adc->base + JZ_REG_ADC_CFG);

 	spin_unlock_irqrestore(&adc->lock, flags);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(jz4740_adc_set_config);

 static struct resource jz4740_hwmon_resources[] = {
 	{
 		.start = JZ_ADC_IRQ_ADCIN,
 		.flags = IORESOURCE_IRQ,
 	},
 	{
 		.start	= JZ_REG_ADC_HWMON_BASE,
 		.end	= JZ_REG_ADC_HWMON_BASE + 3,
 		.flags	= IORESOURCE_MEM,
 	},
 };

 static struct resource jz4740_battery_resources[] = {
 	{
 		.start = JZ_ADC_IRQ_BATTERY,
 		.flags = IORESOURCE_IRQ,
 	},
 	{
 		.start	= JZ_REG_ADC_BATTERY_BASE,
 		.end	= JZ_REG_ADC_BATTERY_BASE + 3,
 		.flags	= IORESOURCE_MEM,
 	},
 };

 const struct mfd_cell jz4740_adc_cells[] = {
 	{
 		.id = 0,
 		.name = "jz4740-hwmon",
 		.num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
 		.resources = jz4740_hwmon_resources,
 		.platform_data = (void *)&jz4740_adc_cells[0],
 		.data_size = sizeof(struct mfd_cell),

 		.enable = jz4740_adc_cell_enable,
 		.disable = jz4740_adc_cell_disable,
 	},
 	{
 		.id = 1,
 		.name = "jz4740-battery",
 		.num_resources = ARRAY_SIZE(jz4740_battery_resources),
 		.resources = jz4740_battery_resources,
 		.platform_data = (void *)&jz4740_adc_cells[1],
 		.data_size = sizeof(struct mfd_cell),

 		.enable = jz4740_adc_cell_enable,
 		.disable = jz4740_adc_cell_disable,
 	},
 };

 static int __devinit jz4740_adc_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct jz4740_adc *adc;
 	struct resource *mem_base;
 	int irq;

 	adc = kmalloc(sizeof(*adc), GFP_KERNEL);
 	if (!adc) {
 		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 		return -ENOMEM;
 	}

 	adc->irq = platform_get_irq(pdev, 0);
 	if (adc->irq < 0) {
 		ret = adc->irq;
 		dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 		goto err_free;
 	}

 	adc->irq_base = platform_get_irq(pdev, 1);
 	if (adc->irq_base < 0) {
 		ret = adc->irq_base;
 		dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
 		goto err_free;
 	}

 	mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem_base) {
 		ret = -ENOENT;
 		dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
 		goto err_free;
 	}

 	/* Only request the shared registers for the MFD driver */
 	adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
 					pdev->name);
 	if (!adc->mem) {
 		ret = -EBUSY;
 		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
 		goto err_free;
 	}

 	adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
 	if (!adc->base) {
 		ret = -EBUSY;
 		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
 		goto err_release_mem_region;
 	}

 	adc->clk = clk_get(&pdev->dev, "adc");
 	if (IS_ERR(adc->clk)) {
 		ret = PTR_ERR(adc->clk);
 		dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
 		goto err_iounmap;
 	}

 	spin_lock_init(&adc->lock);
 	atomic_set(&adc->clk_ref, 0);

 	platform_set_drvdata(pdev, adc);

 	for (irq = adc->irq_base; irq < adc->irq_base + 5; ++irq) {
 		set_irq_chip_data(irq, adc);
 		set_irq_chip_and_handler(irq, &jz4740_adc_irq_chip,
 		    handle_level_irq);
 	}

 	set_irq_data(adc->irq, adc);
 	set_irq_chained_handler(adc->irq, jz4740_adc_irq_demux);

 	writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
 	writeb(0xff, adc->base + JZ_REG_ADC_CTRL);

 	ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
 		ARRAY_SIZE(jz4740_adc_cells), mem_base, adc->irq_base);
 	if (ret < 0)
 		goto err_clk_put;

 	return 0;

 err_clk_put:
 	clk_put(adc->clk);
 err_iounmap:
 	platform_set_drvdata(pdev, NULL);
 	iounmap(adc->base);
 err_release_mem_region:
 	release_mem_region(adc->mem->start, resource_size(adc->mem));
 err_free:
 	kfree(adc);

 	return ret;
 }

 static int __devexit jz4740_adc_remove(struct platform_device *pdev)
 {
 	struct jz4740_adc *adc = platform_get_drvdata(pdev);

 	mfd_remove_devices(&pdev->dev);

 	set_irq_data(adc->irq, NULL);
 	set_irq_chained_handler(adc->irq, NULL);

 	iounmap(adc->base);
 	release_mem_region(adc->mem->start, resource_size(adc->mem));

 	clk_put(adc->clk);

 	platform_set_drvdata(pdev, NULL);

 	kfree(adc);

 	return 0;
 }

 struct platform_driver jz4740_adc_driver = {
 	.probe	= jz4740_adc_probe,
 	.remove = __devexit_p(jz4740_adc_remove),
 	.driver = {
 		.name = "jz4740-adc",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init jz4740_adc_init(void)
 {
 	return platform_driver_register(&jz4740_adc_driver);
 }
 module_init(jz4740_adc_init);

 static void __exit jz4740_adc_exit(void)
 {
 	platform_driver_unregister(&jz4740_adc_driver);
 }
 module_exit(jz4740_adc_exit);

 MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:jz4740-adc");
	/*
	* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
	* JZ4740 SoC ADC driver
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* This driver synchronizes access to the JZ4740 ADC core between the
	* JZ4740 battery and hwmon drivers.
	*/

	#include <linux/err.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>

	#include <linux/clk.h>
	#include <linux/mfd/core.h>

	#include <linux/jz4740-adc.h>


	#define JZ_REG_ADC_ENABLE 0x00
	#define JZ_REG_ADC_CFG 0x04
	#define JZ_REG_ADC_CTRL 0x08
	#define JZ_REG_ADC_STATUS 0x0c

	#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
	#define JZ_REG_ADC_BATTERY_BASE 0x1c
	#define JZ_REG_ADC_HWMON_BASE 0x20

	#define JZ_ADC_ENABLE_TOUCH BIT(2)
	#define JZ_ADC_ENABLE_BATTERY BIT(1)
	#define JZ_ADC_ENABLE_ADCIN BIT(0)

	enum {
	JZ_ADC_IRQ_ADCIN = 0,
	JZ_ADC_IRQ_BATTERY,
	JZ_ADC_IRQ_TOUCH,
	JZ_ADC_IRQ_PENUP,
	JZ_ADC_IRQ_PENDOWN,
	};

	struct jz4740_adc {
	struct resource *mem;
	void __iomem *base;

	int irq;
	int irq_base;

	struct clk *clk;
	atomic_t clk_ref;

	spinlock_t lock;
	};

	static inline void jz4740_adc_irq_set_masked(struct jz4740_adc *adc, int irq,
	bool masked)
	{
	unsigned long flags;
	uint8_t val;

	irq -= adc->irq_base;

	spin_lock_irqsave(&adc->lock, flags);

	val = readb(adc->base + JZ_REG_ADC_CTRL);
	if (masked)
	val \|= BIT(irq);
	else
	val &= ~BIT(irq);
	writeb(val, adc->base + JZ_REG_ADC_CTRL);

	spin_unlock_irqrestore(&adc->lock, flags);
	}

	static void jz4740_adc_irq_mask(struct irq_data *data)
	{
	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
	jz4740_adc_irq_set_masked(adc, data->irq, true);
	}

	static void jz4740_adc_irq_unmask(struct irq_data *data)
	{
	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
	jz4740_adc_irq_set_masked(adc, data->irq, false);
	}

	static void jz4740_adc_irq_ack(struct irq_data *data)
	{
	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
	unsigned int irq = data->irq - adc->irq_base;
	writeb(BIT(irq), adc->base + JZ_REG_ADC_STATUS);
	}

	static struct irq_chip jz4740_adc_irq_chip = {
	.name = "jz4740-adc",
	.irq_mask = jz4740_adc_irq_mask,
	.irq_unmask = jz4740_adc_irq_unmask,
	.irq_ack = jz4740_adc_irq_ack,
	};

	static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
	{
	struct jz4740_adc *adc = get_irq_desc_data(desc);
	uint8_t status;
	unsigned int i;

	status = readb(adc->base + JZ_REG_ADC_STATUS);

	for (i = 0; i < 5; ++i) {
	if (status & BIT(i))
	generic_handle_irq(adc->irq_base + i);
	}
	}


	/* Refcounting for the ADC clock is done in here instead of in the clock
	* framework, because it is the only clock which is shared between multiple
	* devices and thus is the only clock which needs refcounting */
	static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
	{
	if (atomic_inc_return(&adc->clk_ref) == 1)
	clk_enable(adc->clk);
	}

	static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
	{
	if (atomic_dec_return(&adc->clk_ref) == 0)
	clk_disable(adc->clk);
	}

	static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
	bool enabled)
	{
	unsigned long flags;
	uint8_t val;

	spin_lock_irqsave(&adc->lock, flags);

	val = readb(adc->base + JZ_REG_ADC_ENABLE);
	if (enabled)
	val \|= BIT(engine);
	else
	val &= ~BIT(engine);
	writeb(val, adc->base + JZ_REG_ADC_ENABLE);

	spin_unlock_irqrestore(&adc->lock, flags);
	}

	static int jz4740_adc_cell_enable(struct platform_device *pdev)
	{
	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);

	jz4740_adc_clk_enable(adc);
	jz4740_adc_set_enabled(adc, pdev->id, true);

	return 0;
	}

	static int jz4740_adc_cell_disable(struct platform_device *pdev)
	{
	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);

	jz4740_adc_set_enabled(adc, pdev->id, false);
	jz4740_adc_clk_disable(adc);

	return 0;
	}

	int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
	{
	struct jz4740_adc *adc = dev_get_drvdata(dev);
	unsigned long flags;
	uint32_t cfg;

	if (!adc)
	return -ENODEV;

	spin_lock_irqsave(&adc->lock, flags);

	cfg = readl(adc->base + JZ_REG_ADC_CFG);

	cfg &= ~mask;
	cfg \|= val;

	writel(cfg, adc->base + JZ_REG_ADC_CFG);

	spin_unlock_irqrestore(&adc->lock, flags);

	return 0;
	}
	EXPORT_SYMBOL_GPL(jz4740_adc_set_config);

	static struct resource jz4740_hwmon_resources[] = {
	{
	.start = JZ_ADC_IRQ_ADCIN,
	.flags = IORESOURCE_IRQ,
	},
	{
	.start = JZ_REG_ADC_HWMON_BASE,
	.end = JZ_REG_ADC_HWMON_BASE + 3,
	.flags = IORESOURCE_MEM,
	},
	};

	static struct resource jz4740_battery_resources[] = {
	{
	.start = JZ_ADC_IRQ_BATTERY,
	.flags = IORESOURCE_IRQ,
	},
	{
	.start = JZ_REG_ADC_BATTERY_BASE,
	.end = JZ_REG_ADC_BATTERY_BASE + 3,
	.flags = IORESOURCE_MEM,
	},
	};

	const struct mfd_cell jz4740_adc_cells[] = {
	{
	.id = 0,
	.name = "jz4740-hwmon",
	.num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
	.resources = jz4740_hwmon_resources,
	.platform_data = (void *)&jz4740_adc_cells[0],
	.data_size = sizeof(struct mfd_cell),

	.enable = jz4740_adc_cell_enable,
	.disable = jz4740_adc_cell_disable,
	},
	{
	.id = 1,
	.name = "jz4740-battery",
	.num_resources = ARRAY_SIZE(jz4740_battery_resources),
	.resources = jz4740_battery_resources,
	.platform_data = (void *)&jz4740_adc_cells[1],
	.data_size = sizeof(struct mfd_cell),

	.enable = jz4740_adc_cell_enable,
	.disable = jz4740_adc_cell_disable,
	},
	};

	static int __devinit jz4740_adc_probe(struct platform_device *pdev)
	{
	int ret;
	struct jz4740_adc *adc;
	struct resource *mem_base;
	int irq;

	adc = kmalloc(sizeof(*adc), GFP_KERNEL);
	if (!adc) {
	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
	return -ENOMEM;
	}

	adc->irq = platform_get_irq(pdev, 0);
	if (adc->irq < 0) {
	ret = adc->irq;
	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
	goto err_free;
	}

	adc->irq_base = platform_get_irq(pdev, 1);
	if (adc->irq_base < 0) {
	ret = adc->irq_base;
	dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
	goto err_free;
	}

	mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem_base) {
	ret = -ENOENT;
	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
	goto err_free;
	}

	/* Only request the shared registers for the MFD driver */
	adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
	pdev->name);
	if (!adc->mem) {
	ret = -EBUSY;
	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
	goto err_free;
	}

	adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
	if (!adc->base) {
	ret = -EBUSY;
	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
	goto err_release_mem_region;
	}

	adc->clk = clk_get(&pdev->dev, "adc");
	if (IS_ERR(adc->clk)) {
	ret = PTR_ERR(adc->clk);
	dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
	goto err_iounmap;
	}

	spin_lock_init(&adc->lock);
	atomic_set(&adc->clk_ref, 0);

	platform_set_drvdata(pdev, adc);

	for (irq = adc->irq_base; irq < adc->irq_base + 5; ++irq) {
	set_irq_chip_data(irq, adc);
	set_irq_chip_and_handler(irq, &jz4740_adc_irq_chip,
	handle_level_irq);
	}

	set_irq_data(adc->irq, adc);
	set_irq_chained_handler(adc->irq, jz4740_adc_irq_demux);

	writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
	writeb(0xff, adc->base + JZ_REG_ADC_CTRL);

	ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
	ARRAY_SIZE(jz4740_adc_cells), mem_base, adc->irq_base);
	if (ret < 0)
	goto err_clk_put;

	return 0;

	err_clk_put:
	clk_put(adc->clk);
	err_iounmap:
	platform_set_drvdata(pdev, NULL);
	iounmap(adc->base);
	err_release_mem_region:
	release_mem_region(adc->mem->start, resource_size(adc->mem));
	err_free:
	kfree(adc);

	return ret;
	}

	static int __devexit jz4740_adc_remove(struct platform_device *pdev)
	{
	struct jz4740_adc *adc = platform_get_drvdata(pdev);

	mfd_remove_devices(&pdev->dev);

	set_irq_data(adc->irq, NULL);
	set_irq_chained_handler(adc->irq, NULL);

	iounmap(adc->base);
	release_mem_region(adc->mem->start, resource_size(adc->mem));

	clk_put(adc->clk);

	platform_set_drvdata(pdev, NULL);

	kfree(adc);

	return 0;
	}

	struct platform_driver jz4740_adc_driver = {
	.probe = jz4740_adc_probe,
	.remove = __devexit_p(jz4740_adc_remove),
	.driver = {
	.name = "jz4740-adc",
	.owner = THIS_MODULE,
	},
	};

	static int __init jz4740_adc_init(void)
	{
	return platform_driver_register(&jz4740_adc_driver);
	}
	module_init(jz4740_adc_init);

	static void __exit jz4740_adc_exit(void)
	{
	platform_driver_unregister(&jz4740_adc_driver);
	}
	module_exit(jz4740_adc_exit);

	MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:jz4740-adc");