[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / plat-samsung / adc.c

/* arch/arm/plat-samsung/adc.c
 *
 * Copyright (c) 2008 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
 *
 * Samsung ADC device core
 *
 * 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.
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>

#include <plat/regs-adc.h>
#include <plat/adc.h>

/* This driver is designed to control the usage of the ADC block between
 * the touchscreen and any other drivers that may need to use it, such as
 * the hwmon driver.
 *
 * Priority will be given to the touchscreen driver, but as this itself is
 * rate limited it should not starve other requests which are processed in
 * order that they are received.
 *
 * Each user registers to get a client block which uniquely identifies it
 * and stores information such as the necessary functions to callback when
 * action is required.
 */

enum s3c_cpu_type {
	TYPE_S3C24XX,
	TYPE_S3C64XX
};

struct s3c_adc_client {
	struct platform_device	*pdev;
	struct list_head	 pend;
	wait_queue_head_t	*wait;

	unsigned int		 nr_samples;
	int			 result;
	unsigned char		 is_ts;
	unsigned char		 channel;

	void	(*select_cb)(struct s3c_adc_client *c, unsigned selected);
	void	(*convert_cb)(struct s3c_adc_client *c,
			      unsigned val1, unsigned val2,
			      unsigned *samples_left);
};

struct adc_device {
	struct platform_device	*pdev;
	struct platform_device	*owner;
	struct clk		*clk;
	struct s3c_adc_client	*cur;
	struct s3c_adc_client	*ts_pend;
	void __iomem		*regs;

	unsigned int		 prescale;

	int			 irq;
};

static struct adc_device *adc_dev;

static LIST_HEAD(adc_pending);

#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)

static inline void s3c_adc_convert(struct adc_device *adc)
{
	unsigned con = readl(adc->regs + S3C2410_ADCCON);

	con |= S3C2410_ADCCON_ENABLE_START;
	writel(con, adc->regs + S3C2410_ADCCON);
}

static inline void s3c_adc_select(struct adc_device *adc,
				  struct s3c_adc_client *client)
{
	unsigned con = readl(adc->regs + S3C2410_ADCCON);

	client->select_cb(client, 1);

	con &= ~S3C2410_ADCCON_MUXMASK;
	con &= ~S3C2410_ADCCON_STDBM;
	con &= ~S3C2410_ADCCON_STARTMASK;

	if (!client->is_ts)
		con |= S3C2410_ADCCON_SELMUX(client->channel);

	writel(con, adc->regs + S3C2410_ADCCON);
}

static void s3c_adc_dbgshow(struct adc_device *adc)
{
	adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
		readl(adc->regs + S3C2410_ADCCON),
		readl(adc->regs + S3C2410_ADCTSC),
		readl(adc->regs + S3C2410_ADCDLY));
}

static void s3c_adc_try(struct adc_device *adc)
{
	struct s3c_adc_client *next = adc->ts_pend;

	if (!next && !list_empty(&adc_pending)) {
		next = list_first_entry(&adc_pending,
					struct s3c_adc_client, pend);
		list_del(&next->pend);
	} else
		adc->ts_pend = NULL;

	if (next) {
		adc_dbg(adc, "new client is %p\n", next);
		adc->cur = next;
		s3c_adc_select(adc, next);
		s3c_adc_convert(adc);
		s3c_adc_dbgshow(adc);
	}
}

int s3c_adc_start(struct s3c_adc_client *client,
		  unsigned int channel, unsigned int nr_samples)
{
	struct adc_device *adc = adc_dev;
	unsigned long flags;

	if (!adc) {
		printk(KERN_ERR "%s: failed to find adc\n", __func__);
		return -EINVAL;
	}

	if (client->is_ts && adc->ts_pend)
		return -EAGAIN;

	local_irq_save(flags);

	client->channel = channel;
	client->nr_samples = nr_samples;

	if (client->is_ts)
		adc->ts_pend = client;
	else
		list_add_tail(&client->pend, &adc_pending);

	if (!adc->cur)
		s3c_adc_try(adc);
	local_irq_restore(flags);

	return 0;
}
EXPORT_SYMBOL_GPL(s3c_adc_start);

static void s3c_convert_done(struct s3c_adc_client *client,
			     unsigned v, unsigned u, unsigned *left)
{
	client->result = v;
	wake_up(client->wait);
}

int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
{
	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
	int ret;

	client->convert_cb = s3c_convert_done;
	client->wait = &wake;
	client->result = -1;

	ret = s3c_adc_start(client, ch, 1);
	if (ret < 0)
		goto err;

	ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
	if (client->result < 0) {
		ret = -ETIMEDOUT;
		goto err;
	}

	client->convert_cb = NULL;
	return client->result;

err:
	return ret;
}
EXPORT_SYMBOL_GPL(s3c_adc_read);

static void s3c_adc_default_select(struct s3c_adc_client *client,
				   unsigned select)
{
}

struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
					void (*select)(struct s3c_adc_client *client,
						       unsigned int selected),
					void (*conv)(struct s3c_adc_client *client,
						     unsigned d0, unsigned d1,
						     unsigned *samples_left),
					unsigned int is_ts)
{
	struct s3c_adc_client *client;

	WARN_ON(!pdev);

	if (!select)
		select = s3c_adc_default_select;

	if (!pdev)
		return ERR_PTR(-EINVAL);

	client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
	if (!client) {
		dev_err(&pdev->dev, "no memory for adc client\n");
		return ERR_PTR(-ENOMEM);
	}

	client->pdev = pdev;
	client->is_ts = is_ts;
	client->select_cb = select;
	client->convert_cb = conv;

	return client;
}
EXPORT_SYMBOL_GPL(s3c_adc_register);

void s3c_adc_release(struct s3c_adc_client *client)
{
	/* We should really check that nothing is in progress. */
	if (adc_dev->cur == client)
		adc_dev->cur = NULL;
	if (adc_dev->ts_pend == client)
		adc_dev->ts_pend = NULL;
	else {
		struct list_head *p, *n;
		struct s3c_adc_client *tmp;

		list_for_each_safe(p, n, &adc_pending) {
			tmp = list_entry(p, struct s3c_adc_client, pend);
			if (tmp == client)
				list_del(&tmp->pend);
		}
	}

	if (adc_dev->cur == NULL)
		s3c_adc_try(adc_dev);
	kfree(client);
}
EXPORT_SYMBOL_GPL(s3c_adc_release);

static irqreturn_t s3c_adc_irq(int irq, void *pw)
{
	struct adc_device *adc = pw;
	struct s3c_adc_client *client = adc->cur;
	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
	unsigned long flags;
	unsigned data0, data1;

	if (!client) {
		dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
		goto exit;
	}

	data0 = readl(adc->regs + S3C2410_ADCDAT0);
	data1 = readl(adc->regs + S3C2410_ADCDAT1);
	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);

	client->nr_samples--;

	if (cpu == TYPE_S3C64XX) {
		/* S3C64XX ADC resolution is 12-bit */
		data0 &= 0xfff;
		data1 &= 0xfff;
	} else {
		data0 &= 0x3ff;
		data1 &= 0x3ff;
	}

	if (client->convert_cb)
		(client->convert_cb)(client, data0, data1, &client->nr_samples);

	if (client->nr_samples > 0) {
		/* fire another conversion for this */

		client->select_cb(client, 1);
		s3c_adc_convert(adc);
	} else {
		local_irq_save(flags);
		(client->select_cb)(client, 0);
		adc->cur = NULL;

		s3c_adc_try(adc);
		local_irq_restore(flags);
	}

exit:
	if (cpu == TYPE_S3C64XX) {
		/* Clear ADC interrupt */
		writel(0, adc->regs + S3C64XX_ADCCLRINT);
	}
	return IRQ_HANDLED;
}

static int s3c_adc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct adc_device *adc;
	struct resource *regs;
	int ret;
	unsigned tmp;

	adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
	if (adc == NULL) {
		dev_err(dev, "failed to allocate adc_device\n");
		return -ENOMEM;
	}

	adc->pdev = pdev;
	adc->prescale = S3C2410_ADCCON_PRSCVL(49);

	adc->irq = platform_get_irq(pdev, 1);
	if (adc->irq <= 0) {
		dev_err(dev, "failed to get adc irq\n");
		ret = -ENOENT;
		goto err_alloc;
	}

	ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
	if (ret < 0) {
		dev_err(dev, "failed to attach adc irq\n");
		goto err_alloc;
	}

	adc->clk = clk_get(dev, "adc");
	if (IS_ERR(adc->clk)) {
		dev_err(dev, "failed to get adc clock\n");
		ret = PTR_ERR(adc->clk);
		goto err_irq;
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs) {
		dev_err(dev, "failed to find registers\n");
		ret = -ENXIO;
		goto err_clk;
	}

	adc->regs = ioremap(regs->start, resource_size(regs));
	if (!adc->regs) {
		dev_err(dev, "failed to map registers\n");
		ret = -ENXIO;
		goto err_clk;
	}

	clk_enable(adc->clk);

	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
	if (platform_get_device_id(pdev)->driver_data == TYPE_S3C64XX) {
		/* Enable 12-bit ADC resolution */
		tmp |= S3C64XX_ADCCON_RESSEL;
	}
	writel(tmp, adc->regs + S3C2410_ADCCON);

	dev_info(dev, "attached adc driver\n");

	platform_set_drvdata(pdev, adc);
	adc_dev = adc;

	return 0;

 err_clk:
	clk_put(adc->clk);

 err_irq:
	free_irq(adc->irq, adc);

 err_alloc:
	kfree(adc);
	return ret;
}

static int __devexit s3c_adc_remove(struct platform_device *pdev)
{
	struct adc_device *adc = platform_get_drvdata(pdev);

	iounmap(adc->regs);
	free_irq(adc->irq, adc);
	clk_disable(adc->clk);
	clk_put(adc->clk);
	kfree(adc);

	return 0;
}

#ifdef CONFIG_PM
static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct adc_device *adc = platform_get_drvdata(pdev);
	u32 con;

	con = readl(adc->regs + S3C2410_ADCCON);
	con |= S3C2410_ADCCON_STDBM;
	writel(con, adc->regs + S3C2410_ADCCON);

	disable_irq(adc->irq);
	clk_disable(adc->clk);

	return 0;
}

static int s3c_adc_resume(struct platform_device *pdev)
{
	struct adc_device *adc = platform_get_drvdata(pdev);

	clk_enable(adc->clk);
	enable_irq(adc->irq);

	writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
	       adc->regs + S3C2410_ADCCON);

	return 0;
}

#else
#define s3c_adc_suspend NULL
#define s3c_adc_resume NULL
#endif

static struct platform_device_id s3c_adc_driver_ids[] = {
	{
		.name           = "s3c24xx-adc",
		.driver_data    = TYPE_S3C24XX,
	}, {
		.name           = "s3c64xx-adc",
		.driver_data    = TYPE_S3C64XX,
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);

static struct platform_driver s3c_adc_driver = {
	.id_table	= s3c_adc_driver_ids,
	.driver		= {
		.name	= "s3c-adc",
		.owner	= THIS_MODULE,
	},
	.probe		= s3c_adc_probe,
	.remove		= __devexit_p(s3c_adc_remove),
	.suspend	= s3c_adc_suspend,
	.resume		= s3c_adc_resume,
};

static int __init adc_init(void)
{
	int ret;

	ret = platform_driver_register(&s3c_adc_driver);
	if (ret)
		printk(KERN_ERR "%s: failed to add adc driver\n", __func__);

	return ret;
}

arch_initcall(adc_init);
Commit	Line	Data
3929e1e7	1	/* arch/arm/plat-samsung/adc.c
28ab44c5 BD	2	*
	3	* Copyright (c) 2008 Simtec Electronics
	4	* http://armlinux.simtec.co.uk/
	5	* Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
	6	*
3929e1e7	7	* Samsung ADC device core
28ab44c5 BD	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/platform_device.h>
d43c36dc	17	#include <linux/sched.h>
28ab44c5 BD	18	#include <linux/list.h>
	19	#include <linux/err.h>
	20	#include <linux/clk.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/io.h>
	23
	24	#include <plat/regs-adc.h>
	25	#include <plat/adc.h>
	26
	27	/* This driver is designed to control the usage of the ADC block between
	28	* the touchscreen and any other drivers that may need to use it, such as
	29	* the hwmon driver.
	30	*
	31	* Priority will be given to the touchscreen driver, but as this itself is
	32	* rate limited it should not starve other requests which are processed in
	33	* order that they are received.
	34	*
	35	* Each user registers to get a client block which uniquely identifies it
	36	* and stores information such as the necessary functions to callback when
	37	* action is required.
	38	*/
	39
bcedfa98 MC	40	enum s3c_cpu_type {
	41	TYPE_S3C24XX,
	42	TYPE_S3C64XX
	43	};
	44
28ab44c5 BD	45	struct s3c_adc_client {
	46	struct platform_device *pdev;
	47	struct list_head pend;
e170adcb	48	wait_queue_head_t *wait;
28ab44c5 BD	49
28ab44c5 BD	50	unsigned int nr_samples;
e170adcb	51	int result;
28ab44c5 BD	52	unsigned char is_ts;
	53	unsigned char channel;
	54
e170adcb BD	55	void (select_cb)(struct s3c_adc_client c, unsigned selected);
	56	void (convert_cb)(struct s3c_adc_client c,
	57	unsigned val1, unsigned val2,
3f7ea467	58	unsigned *samples_left);
28ab44c5 BD	59	};
	60
	61	struct adc_device {
	62	struct platform_device *pdev;
	63	struct platform_device *owner;
	64	struct clk *clk;
	65	struct s3c_adc_client *cur;
	66	struct s3c_adc_client *ts_pend;
	67	void __iomem *regs;
	68
	69	unsigned int prescale;
	70
	71	int irq;
	72	};
	73
	74	static struct adc_device *adc_dev;
	75
	76	static LIST_HEAD(adc_pending);
	77
	78	#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
	79
	80	static inline void s3c_adc_convert(struct adc_device *adc)
	81	{
	82	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	83
	84	con \|= S3C2410_ADCCON_ENABLE_START;
	85	writel(con, adc->regs + S3C2410_ADCCON);
	86	}
	87
	88	static inline void s3c_adc_select(struct adc_device *adc,
	89	struct s3c_adc_client *client)
	90	{
	91	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	92
e170adcb	93	client->select_cb(client, 1);
28ab44c5 BD	94
	95	con &= ~S3C2410_ADCCON_MUXMASK;
	96	con &= ~S3C2410_ADCCON_STDBM;
	97	con &= ~S3C2410_ADCCON_STARTMASK;
	98
	99	if (!client->is_ts)
	100	con \|= S3C2410_ADCCON_SELMUX(client->channel);
	101
	102	writel(con, adc->regs + S3C2410_ADCCON);
	103	}
	104
	105	static void s3c_adc_dbgshow(struct adc_device *adc)
	106	{
	107	adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
	108	readl(adc->regs + S3C2410_ADCCON),
	109	readl(adc->regs + S3C2410_ADCTSC),
	110	readl(adc->regs + S3C2410_ADCDLY));
	111	}
	112
f8c8ac81	113	static void s3c_adc_try(struct adc_device *adc)
28ab44c5 BD	114	{
	115	struct s3c_adc_client *next = adc->ts_pend;
	116
	117	if (!next && !list_empty(&adc_pending)) {
	118	next = list_first_entry(&adc_pending,
	119	struct s3c_adc_client, pend);
	120	list_del(&next->pend);
	121	} else
	122	adc->ts_pend = NULL;
	123
	124	if (next) {
	125	adc_dbg(adc, "new client is %p\n", next);
	126	adc->cur = next;
	127	s3c_adc_select(adc, next);
	128	s3c_adc_convert(adc);
	129	s3c_adc_dbgshow(adc);
	130	}
	131	}
	132
	133	int s3c_adc_start(struct s3c_adc_client *client,
	134	unsigned int channel, unsigned int nr_samples)
	135	{
	136	struct adc_device *adc = adc_dev;
	137	unsigned long flags;
	138
	139	if (!adc) {
	140	printk(KERN_ERR "%s: failed to find adc\n", __func__);
	141	return -EINVAL;
	142	}
	143
	144	if (client->is_ts && adc->ts_pend)
	145	return -EAGAIN;
	146
	147	local_irq_save(flags);
	148
	149	client->channel = channel;
	150	client->nr_samples = nr_samples;
	151
	152	if (client->is_ts)
	153	adc->ts_pend = client;
	154	else
	155	list_add_tail(&client->pend, &adc_pending);
	156
	157	if (!adc->cur)
	158	s3c_adc_try(adc);
	159	local_irq_restore(flags);
	160
	161	return 0;
	162	}
	163	EXPORT_SYMBOL_GPL(s3c_adc_start);
	164
e170adcb BD	165	static void s3c_convert_done(struct s3c_adc_client *client,
	166	unsigned v, unsigned u, unsigned *left)
	167	{
	168	client->result = v;
	169	wake_up(client->wait);
	170	}
	171
	172	int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
	173	{
	174	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
	175	int ret;
	176
	177	client->convert_cb = s3c_convert_done;
	178	client->wait = &wake;
	179	client->result = -1;
	180
	181	ret = s3c_adc_start(client, ch, 1);
	182	if (ret < 0)
	183	goto err;
	184
	185	ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
	186	if (client->result < 0) {
	187	ret = -ETIMEDOUT;
	188	goto err;
	189	}
	190
	191	client->convert_cb = NULL;
	192	return client->result;
	193
	194	err:
	195	return ret;
	196	}
d3bf3956	197	EXPORT_SYMBOL_GPL(s3c_adc_read);
e170adcb BD	198
	199	static void s3c_adc_default_select(struct s3c_adc_client *client,
	200	unsigned select)
28ab44c5 BD	201	{
	202	}
	203
	204	struct s3c_adc_client s3c_adc_register(struct platform_device pdev,
e170adcb BD	205	void (select)(struct s3c_adc_client client,
	206	unsigned int selected),
	207	void (conv)(struct s3c_adc_client client,
	208	unsigned d0, unsigned d1,
3f7ea467	209	unsigned *samples_left),
28ab44c5 BD	210	unsigned int is_ts)
	211	{
	212	struct s3c_adc_client *client;
	213
	214	WARN_ON(!pdev);
28ab44c5 BD	215
	216	if (!select)
	217	select = s3c_adc_default_select;
	218
e170adcb	219	if (!pdev)
28ab44c5 BD	220	return ERR_PTR(-EINVAL);
	221
	222	client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
	223	if (!client) {
	224	dev_err(&pdev->dev, "no memory for adc client\n");
	225	return ERR_PTR(-ENOMEM);
	226	}
	227
	228	client->pdev = pdev;
	229	client->is_ts = is_ts;
	230	client->select_cb = select;
	231	client->convert_cb = conv;
	232
	233	return client;
	234	}
	235	EXPORT_SYMBOL_GPL(s3c_adc_register);
	236
	237	void s3c_adc_release(struct s3c_adc_client *client)
	238	{
	239	/* We should really check that nothing is in progress. */
0c3ee078 RL	240	if (adc_dev->cur == client)
	241	adc_dev->cur = NULL;
	242	if (adc_dev->ts_pend == client)
	243	adc_dev->ts_pend = NULL;
	244	else {
	245	struct list_head p, n;
	246	struct s3c_adc_client *tmp;
	247
	248	list_for_each_safe(p, n, &adc_pending) {
	249	tmp = list_entry(p, struct s3c_adc_client, pend);
	250	if (tmp == client)
	251	list_del(&tmp->pend);
	252	}
	253	}
	254
	255	if (adc_dev->cur == NULL)
	256	s3c_adc_try(adc_dev);
28ab44c5 BD	257	kfree(client);
	258	}
	259	EXPORT_SYMBOL_GPL(s3c_adc_release);
	260
	261	static irqreturn_t s3c_adc_irq(int irq, void *pw)
	262	{
	263	struct adc_device *adc = pw;
	264	struct s3c_adc_client *client = adc->cur;
91492b4a	265	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
28ab44c5 BD	266	unsigned long flags;
	267	unsigned data0, data1;
	268
	269	if (!client) {
	270	dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
bcedfa98	271	goto exit;
28ab44c5 BD	272	}
	273
	274	data0 = readl(adc->regs + S3C2410_ADCDAT0);
	275	data1 = readl(adc->regs + S3C2410_ADCDAT1);
	276	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
	277
3f7ea467	278	client->nr_samples--;
e170adcb	279
91492b4a MC	280	if (cpu == TYPE_S3C64XX) {
	281	/* S3C64XX ADC resolution is 12-bit */
	282	data0 &= 0xfff;
	283	data1 &= 0xfff;
	284	} else {
	285	data0 &= 0x3ff;
	286	data1 &= 0x3ff;
	287	}
	288
e170adcb	289	if (client->convert_cb)
91492b4a	290	(client->convert_cb)(client, data0, data1, &client->nr_samples);
28ab44c5	291
3f7ea467	292	if (client->nr_samples > 0) {
28ab44c5 BD	293	/* fire another conversion for this */
28ab44c5 BD	294
e170adcb	295	client->select_cb(client, 1);
28ab44c5 BD	296	s3c_adc_convert(adc);
	297	} else {
	298	local_irq_save(flags);
e170adcb	299	(client->select_cb)(client, 0);
28ab44c5 BD	300	adc->cur = NULL;
	301
	302	s3c_adc_try(adc);
	303	local_irq_restore(flags);
	304	}
	305
bcedfa98	306	exit:
91492b4a	307	if (cpu == TYPE_S3C64XX) {
bcedfa98 MC	308	/* Clear ADC interrupt */
	309	writel(0, adc->regs + S3C64XX_ADCCLRINT);
	310	}
28ab44c5 BD	311	return IRQ_HANDLED;
	312	}
	313
	314	static int s3c_adc_probe(struct platform_device *pdev)
	315	{
	316	struct device *dev = &pdev->dev;
	317	struct adc_device *adc;
	318	struct resource *regs;
	319	int ret;
91492b4a	320	unsigned tmp;
28ab44c5 BD	321
	322	adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
	323	if (adc == NULL) {
	324	dev_err(dev, "failed to allocate adc_device\n");
	325	return -ENOMEM;
	326	}
	327
	328	adc->pdev = pdev;
	329	adc->prescale = S3C2410_ADCCON_PRSCVL(49);
	330
	331	adc->irq = platform_get_irq(pdev, 1);
	332	if (adc->irq <= 0) {
	333	dev_err(dev, "failed to get adc irq\n");
	334	ret = -ENOENT;
	335	goto err_alloc;
	336	}
	337
	338	ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
	339	if (ret < 0) {
	340	dev_err(dev, "failed to attach adc irq\n");
	341	goto err_alloc;
	342	}
	343
	344	adc->clk = clk_get(dev, "adc");
	345	if (IS_ERR(adc->clk)) {
	346	dev_err(dev, "failed to get adc clock\n");
	347	ret = PTR_ERR(adc->clk);
	348	goto err_irq;
	349	}
	350
	351	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	352	if (!regs) {
	353	dev_err(dev, "failed to find registers\n");
	354	ret = -ENXIO;
	355	goto err_clk;
	356	}
	357
	358	adc->regs = ioremap(regs->start, resource_size(regs));
	359	if (!adc->regs) {
	360	dev_err(dev, "failed to map registers\n");
	361	ret = -ENXIO;
	362	goto err_clk;
	363	}
	364
	365	clk_enable(adc->clk);
	366
91492b4a MC	367	tmp = adc->prescale \| S3C2410_ADCCON_PRSCEN;
	368	if (platform_get_device_id(pdev)->driver_data == TYPE_S3C64XX) {
	369	/* Enable 12-bit ADC resolution */
	370	tmp \|= S3C64XX_ADCCON_RESSEL;
	371	}
	372	writel(tmp, adc->regs + S3C2410_ADCCON);
28ab44c5 BD	373
	374	dev_info(dev, "attached adc driver\n");
	375
	376	platform_set_drvdata(pdev, adc);
	377	adc_dev = adc;
	378
	379	return 0;
	380
	381	err_clk:
	382	clk_put(adc->clk);
	383
	384	err_irq:
	385	free_irq(adc->irq, adc);
	386
	387	err_alloc:
	388	kfree(adc);
	389	return ret;
	390	}
	391
ad4e22fa	392	static int __devexit s3c_adc_remove(struct platform_device *pdev)
28ab44c5 BD	393	{
	394	struct adc_device *adc = platform_get_drvdata(pdev);
	395
	396	iounmap(adc->regs);
	397	free_irq(adc->irq, adc);
	398	clk_disable(adc->clk);
	399	clk_put(adc->clk);
	400	kfree(adc);
	401
	402	return 0;
	403	}
	404
	405	#ifdef CONFIG_PM
	406	static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
	407	{
	408	struct adc_device *adc = platform_get_drvdata(pdev);
	409	u32 con;
	410
	411	con = readl(adc->regs + S3C2410_ADCCON);
	412	con \|= S3C2410_ADCCON_STDBM;
	413	writel(con, adc->regs + S3C2410_ADCCON);
	414
a0af8b3c	415	disable_irq(adc->irq);
28ab44c5 BD	416	clk_disable(adc->clk);
	417
	418	return 0;
	419	}
	420
	421	static int s3c_adc_resume(struct platform_device *pdev)
	422	{
	423	struct adc_device *adc = platform_get_drvdata(pdev);
	424
	425	clk_enable(adc->clk);
a0af8b3c	426	enable_irq(adc->irq);
28ab44c5 BD	427
	428	writel(adc->prescale \| S3C2410_ADCCON_PRSCEN,
	429	adc->regs + S3C2410_ADCCON);
	430
	431	return 0;
	432	}
	433
	434	#else
	435	#define s3c_adc_suspend NULL
	436	#define s3c_adc_resume NULL
	437	#endif
	438
bcedfa98 MC	439	static struct platform_device_id s3c_adc_driver_ids[] = {
	440	{
	441	.name = "s3c24xx-adc",
	442	.driver_data = TYPE_S3C24XX,
	443	}, {
	444	.name = "s3c64xx-adc",
	445	.driver_data = TYPE_S3C64XX,
	446	},
	447	{ }
	448	};
	449	MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
	450
28ab44c5	451	static struct platform_driver s3c_adc_driver = {
bcedfa98	452	.id_table = s3c_adc_driver_ids,
28ab44c5	453	.driver = {
bcedfa98	454	.name = "s3c-adc",
28ab44c5 BD	455	.owner = THIS_MODULE,
	456	},
	457	.probe = s3c_adc_probe,
	458	.remove = __devexit_p(s3c_adc_remove),
	459	.suspend = s3c_adc_suspend,
	460	.resume = s3c_adc_resume,
	461	};
	462
	463	static int __init adc_init(void)
	464	{
	465	int ret;
	466
	467	ret = platform_driver_register(&s3c_adc_driver);
	468	if (ret)
	469	printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
	470
	471	return ret;
	472	}
	473
	474	arch_initcall(adc_init);