[linux-2.6-block.git] / drivers / mfd / jz4740-adc.c

/*
 * 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");
Commit	Line	Data
91f4debf LPC	1	/*
	2	* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
	3	* JZ4740 SoC ADC driver
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*
	10	* You should have received a copy of the GNU General Public License along
	11	* with this program; if not, write to the Free Software Foundation, Inc.,
	12	* 675 Mass Ave, Cambridge, MA 02139, USA.
	13	*
	14	* This driver synchronizes access to the JZ4740 ADC core between the
	15	* JZ4740 battery and hwmon drivers.
	16	*/
	17
	18	#include <linux/err.h>
	19	#include <linux/irq.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/slab.h>
	25	#include <linux/spinlock.h>
	26
	27	#include <linux/clk.h>
	28	#include <linux/mfd/core.h>
	29
	30	#include <linux/jz4740-adc.h>
	31
	32
	33	#define JZ_REG_ADC_ENABLE 0x00
	34	#define JZ_REG_ADC_CFG 0x04
	35	#define JZ_REG_ADC_CTRL 0x08
	36	#define JZ_REG_ADC_STATUS 0x0c
	37
	38	#define JZ_REG_ADC_TOUCHSCREEN_BASE 0x10
	39	#define JZ_REG_ADC_BATTERY_BASE 0x1c
	40	#define JZ_REG_ADC_HWMON_BASE 0x20
	41
	42	#define JZ_ADC_ENABLE_TOUCH BIT(2)
	43	#define JZ_ADC_ENABLE_BATTERY BIT(1)
	44	#define JZ_ADC_ENABLE_ADCIN BIT(0)
	45
	46	enum {
	47	JZ_ADC_IRQ_ADCIN = 0,
	48	JZ_ADC_IRQ_BATTERY,
	49	JZ_ADC_IRQ_TOUCH,
	50	JZ_ADC_IRQ_PENUP,
	51	JZ_ADC_IRQ_PENDOWN,
	52	};
	53
	54	struct jz4740_adc {
	55	struct resource *mem;
	56	void __iomem *base;
	57
	58	int irq;
	59	int irq_base;
	60
	61	struct clk *clk;
	62	atomic_t clk_ref;
	63
	64	spinlock_t lock;
65	};
66
67	static inline void jz4740_adc_irq_set_masked(struct jz4740_adc *adc, int irq,
68	bool masked)
69	{
70	unsigned long flags;
71	uint8_t val;
72
73	irq -= adc->irq_base;
74
75	spin_lock_irqsave(&adc->lock, flags);
76
77	val = readb(adc->base + JZ_REG_ADC_CTRL);
78	if (masked)
79	val \|= BIT(irq);
80	else
81	val &= ~BIT(irq);
82	writeb(val, adc->base + JZ_REG_ADC_CTRL);
83
84	spin_unlock_irqrestore(&adc->lock, flags);
85	}
86
5af3bde8	87	static void jz4740_adc_irq_mask(struct irq_data *data)
91f4debf	88	{
5af3bde8 MB	89	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
5af3bde8 MB	90	jz4740_adc_irq_set_masked(adc, data->irq, true);
91f4debf LPC	91	}
91f4debf LPC	92
5af3bde8	93	static void jz4740_adc_irq_unmask(struct irq_data *data)
91f4debf	94	{
5af3bde8 MB	95	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
5af3bde8 MB	96	jz4740_adc_irq_set_masked(adc, data->irq, false);
91f4debf LPC	97	}
91f4debf LPC	98
5af3bde8	99	static void jz4740_adc_irq_ack(struct irq_data *data)
91f4debf	100	{
5af3bde8 MB	101	struct jz4740_adc *adc = irq_data_get_irq_chip_data(data);
5af3bde8 MB	102	unsigned int irq = data->irq - adc->irq_base;
91f4debf LPC	103	writeb(BIT(irq), adc->base + JZ_REG_ADC_STATUS);
	104	}
	105
	106	static struct irq_chip jz4740_adc_irq_chip = {
	107	.name = "jz4740-adc",
5af3bde8 MB	108	.irq_mask = jz4740_adc_irq_mask,
	109	.irq_unmask = jz4740_adc_irq_unmask,
	110	.irq_ack = jz4740_adc_irq_ack,
91f4debf LPC	111	};
	112
	113	static void jz4740_adc_irq_demux(unsigned int irq, struct irq_desc *desc)
	114	{
	115	struct jz4740_adc *adc = get_irq_desc_data(desc);
	116	uint8_t status;
	117	unsigned int i;
	118
	119	status = readb(adc->base + JZ_REG_ADC_STATUS);
	120
	121	for (i = 0; i < 5; ++i) {
	122	if (status & BIT(i))
	123	generic_handle_irq(adc->irq_base + i);
	124	}
	125	}
	126
	127
	128	/* Refcounting for the ADC clock is done in here instead of in the clock
	129	* framework, because it is the only clock which is shared between multiple
	130	* devices and thus is the only clock which needs refcounting */
	131	static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)
	132	{
	133	if (atomic_inc_return(&adc->clk_ref) == 1)
	134	clk_enable(adc->clk);
	135	}
	136
	137	static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)
	138	{
	139	if (atomic_dec_return(&adc->clk_ref) == 0)
	140	clk_disable(adc->clk);
	141	}
	142
	143	static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,
	144	bool enabled)
	145	{
	146	unsigned long flags;
	147	uint8_t val;
	148
	149	spin_lock_irqsave(&adc->lock, flags);
	150
	151	val = readb(adc->base + JZ_REG_ADC_ENABLE);
	152	if (enabled)
	153	val \|= BIT(engine);
	154	else
f9c28019	155	val &= ~BIT(engine);
91f4debf LPC	156	writeb(val, adc->base + JZ_REG_ADC_ENABLE);
	157
	158	spin_unlock_irqrestore(&adc->lock, flags);
	159	}
	160
	161	static int jz4740_adc_cell_enable(struct platform_device *pdev)
	162	{
	163	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
	164
	165	jz4740_adc_clk_enable(adc);
	166	jz4740_adc_set_enabled(adc, pdev->id, true);
	167
	168	return 0;
	169	}
	170
	171	static int jz4740_adc_cell_disable(struct platform_device *pdev)
	172	{
	173	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);
	174
	175	jz4740_adc_set_enabled(adc, pdev->id, false);
	176	jz4740_adc_clk_disable(adc);
	177
	178	return 0;
	179	}
	180
	181	int jz4740_adc_set_config(struct device *dev, uint32_t mask, uint32_t val)
	182	{
	183	struct jz4740_adc *adc = dev_get_drvdata(dev);
	184	unsigned long flags;
	185	uint32_t cfg;
	186
	187	if (!adc)
	188	return -ENODEV;
	189
	190	spin_lock_irqsave(&adc->lock, flags);
	191
	192	cfg = readl(adc->base + JZ_REG_ADC_CFG);
	193
	194	cfg &= ~mask;
	195	cfg \|= val;
	196
	197	writel(cfg, adc->base + JZ_REG_ADC_CFG);
	198
	199	spin_unlock_irqrestore(&adc->lock, flags);
	200
	201	return 0;
	202	}
	203	EXPORT_SYMBOL_GPL(jz4740_adc_set_config);
	204
	205	static struct resource jz4740_hwmon_resources[] = {
	206	{
	207	.start = JZ_ADC_IRQ_ADCIN,
	208	.flags = IORESOURCE_IRQ,
	209	},
	210	{
	211	.start = JZ_REG_ADC_HWMON_BASE,
	212	.end = JZ_REG_ADC_HWMON_BASE + 3,
	213	.flags = IORESOURCE_MEM,
	214	},
	215	};
	216
	217	static struct resource jz4740_battery_resources[] = {
	218	{
	219	.start = JZ_ADC_IRQ_BATTERY,
220	.flags = IORESOURCE_IRQ,
221	},
222	{
223	.start = JZ_REG_ADC_BATTERY_BASE,
224	.end = JZ_REG_ADC_BATTERY_BASE + 3,
225	.flags = IORESOURCE_MEM,
226	},
227	};
228
229	const struct mfd_cell jz4740_adc_cells[] = {
230	{
231	.id = 0,
232	.name = "jz4740-hwmon",
233	.num_resources = ARRAY_SIZE(jz4740_hwmon_resources),
234	.resources = jz4740_hwmon_resources,
235	.platform_data = (void *)&jz4740_adc_cells[0],
236	.data_size = sizeof(struct mfd_cell),
237
238	.enable = jz4740_adc_cell_enable,
239	.disable = jz4740_adc_cell_disable,
240	},
241	{
242	.id = 1,
243	.name = "jz4740-battery",
244	.num_resources = ARRAY_SIZE(jz4740_battery_resources),
245	.resources = jz4740_battery_resources,
246	.platform_data = (void *)&jz4740_adc_cells[1],
247	.data_size = sizeof(struct mfd_cell),
248
249	.enable = jz4740_adc_cell_enable,
250	.disable = jz4740_adc_cell_disable,
251	},
252	};
253
254	static int __devinit jz4740_adc_probe(struct platform_device *pdev)
255	{
256	int ret;
257	struct jz4740_adc *adc;
258	struct resource *mem_base;
259	int irq;
260
261	adc = kmalloc(sizeof(*adc), GFP_KERNEL);
789133b7 AL	262	if (!adc) {
	263	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
	264	return -ENOMEM;
	265	}
91f4debf LPC	266
	267	adc->irq = platform_get_irq(pdev, 0);
	268	if (adc->irq < 0) {
	269	ret = adc->irq;
	270	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
	271	goto err_free;
	272	}
	273
	274	adc->irq_base = platform_get_irq(pdev, 1);
	275	if (adc->irq_base < 0) {
	276	ret = adc->irq_base;
	277	dev_err(&pdev->dev, "Failed to get irq base: %d\n", ret);
	278	goto err_free;
	279	}
	280
	281	mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	282	if (!mem_base) {
	283	ret = -ENOENT;
	284	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
	285	goto err_free;
	286	}
	287
	288	/* Only request the shared registers for the MFD driver */
	289	adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,
	290	pdev->name);
	291	if (!adc->mem) {
	292	ret = -EBUSY;
	293	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
	294	goto err_free;
	295	}
	296
	297	adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));
	298	if (!adc->base) {
	299	ret = -EBUSY;
	300	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
	301	goto err_release_mem_region;
	302	}
	303
	304	adc->clk = clk_get(&pdev->dev, "adc");
	305	if (IS_ERR(adc->clk)) {
	306	ret = PTR_ERR(adc->clk);
	307	dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
	308	goto err_iounmap;
	309	}
	310
	311	spin_lock_init(&adc->lock);
	312	atomic_set(&adc->clk_ref, 0);
	313
	314	platform_set_drvdata(pdev, adc);
	315
	316	for (irq = adc->irq_base; irq < adc->irq_base + 5; ++irq) {
	317	set_irq_chip_data(irq, adc);
	318	set_irq_chip_and_handler(irq, &jz4740_adc_irq_chip,
	319	handle_level_irq);
	320	}
	321
	322	set_irq_data(adc->irq, adc);
	323	set_irq_chained_handler(adc->irq, jz4740_adc_irq_demux);
	324
	325	writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);
	326	writeb(0xff, adc->base + JZ_REG_ADC_CTRL);
	327
48736c80	328	ret = mfd_add_devices(&pdev->dev, 0, jz4740_adc_cells,
91f4debf	329	ARRAY_SIZE(jz4740_adc_cells), mem_base, adc->irq_base);
48736c80 AL	330	if (ret < 0)
48736c80 AL	331	goto err_clk_put;
91f4debf	332
48736c80 AL	333	return 0;
	334
	335	err_clk_put:
	336	clk_put(adc->clk);
91f4debf LPC	337	err_iounmap:
	338	platform_set_drvdata(pdev, NULL);
	339	iounmap(adc->base);
	340	err_release_mem_region:
	341	release_mem_region(adc->mem->start, resource_size(adc->mem));
	342	err_free:
	343	kfree(adc);
	344
	345	return ret;
	346	}
	347
	348	static int __devexit jz4740_adc_remove(struct platform_device *pdev)
	349	{
	350	struct jz4740_adc *adc = platform_get_drvdata(pdev);
	351
	352	mfd_remove_devices(&pdev->dev);
	353
	354	set_irq_data(adc->irq, NULL);
	355	set_irq_chained_handler(adc->irq, NULL);
	356
	357	iounmap(adc->base);
	358	release_mem_region(adc->mem->start, resource_size(adc->mem));
	359
	360	clk_put(adc->clk);
	361
	362	platform_set_drvdata(pdev, NULL);
	363
	364	kfree(adc);
	365
	366	return 0;
	367	}
	368
	369	struct platform_driver jz4740_adc_driver = {
	370	.probe = jz4740_adc_probe,
	371	.remove = __devexit_p(jz4740_adc_remove),
	372	.driver = {
	373	.name = "jz4740-adc",
	374	.owner = THIS_MODULE,
	375	},
	376	};
	377
	378	static int __init jz4740_adc_init(void)
	379	{
	380	return platform_driver_register(&jz4740_adc_driver);
	381	}
	382	module_init(jz4740_adc_init);
	383
	384	static void __exit jz4740_adc_exit(void)
	385	{
	386	platform_driver_unregister(&jz4740_adc_driver);
	387	}
	388	module_exit(jz4740_adc_exit);
	389
	390	MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
	391	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	392	MODULE_LICENSE("GPL");
	393	MODULE_ALIAS("platform:jz4740-adc");