[net-next-2.6.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/slab.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;
	spinlock_t		 lock;

	unsigned int		 prescale;

	int			 irq;
};

static struct adc_device *adc_dev;

static LIST_HEAD(adc_pending);	/* protected by adc_device.lock */

#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;

	spin_lock_irqsave(&adc->lock, 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);

	spin_unlock_irqrestore(&adc->lock, 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)
{
	unsigned long flags;

	spin_lock_irqsave(&adc_dev->lock, flags);

	/* 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);

	spin_unlock_irqrestore(&adc_dev->lock, flags);
	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 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 {
		spin_lock(&adc->lock);
		(client->select_cb)(client, 0);
		adc->cur = NULL;

		s3c_adc_try(adc);
		spin_unlock(&adc->lock);
	}

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;
	}

	spin_lock_init(&adc->lock);

	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);
	unsigned long flags;
	u32 con;

	spin_lock_irqsave(&adc->lock, flags);

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

	disable_irq(adc->irq);
	spin_unlock_irqrestore(&adc->lock, flags);
	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	18	#include <linux/list.h>
5a0e3ad6	19	#include <linux/slab.h>
28ab44c5 BD	20	#include <linux/err.h>
	21	#include <linux/clk.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/io.h>
	24
	25	#include <plat/regs-adc.h>
	26	#include <plat/adc.h>
	27
	28	/* This driver is designed to control the usage of the ADC block between
	29	* the touchscreen and any other drivers that may need to use it, such as
	30	* the hwmon driver.
	31	*
	32	* Priority will be given to the touchscreen driver, but as this itself is
	33	* rate limited it should not starve other requests which are processed in
	34	* order that they are received.
	35	*
	36	* Each user registers to get a client block which uniquely identifies it
	37	* and stores information such as the necessary functions to callback when
	38	* action is required.
	39	*/
	40
bcedfa98 MC	41	enum s3c_cpu_type {
	42	TYPE_S3C24XX,
	43	TYPE_S3C64XX
	44	};
	45
28ab44c5 BD	46	struct s3c_adc_client {
	47	struct platform_device *pdev;
	48	struct list_head pend;
e170adcb	49	wait_queue_head_t *wait;
28ab44c5 BD	50
28ab44c5 BD	51	unsigned int nr_samples;
e170adcb	52	int result;
28ab44c5 BD	53	unsigned char is_ts;
	54	unsigned char channel;
	55
e170adcb BD	56	void (select_cb)(struct s3c_adc_client c, unsigned selected);
	57	void (convert_cb)(struct s3c_adc_client c,
	58	unsigned val1, unsigned val2,
3f7ea467	59	unsigned *samples_left);
28ab44c5 BD	60	};
	61
	62	struct adc_device {
	63	struct platform_device *pdev;
	64	struct platform_device *owner;
	65	struct clk *clk;
	66	struct s3c_adc_client *cur;
	67	struct s3c_adc_client *ts_pend;
	68	void __iomem *regs;
1f1f584c	69	spinlock_t lock;
28ab44c5 BD	70
	71	unsigned int prescale;
	72
	73	int irq;
	74	};
	75
	76	static struct adc_device *adc_dev;
	77
1f1f584c	78	static LIST_HEAD(adc_pending); /* protected by adc_device.lock */
28ab44c5 BD	79
	80	#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
	81
	82	static inline void s3c_adc_convert(struct adc_device *adc)
	83	{
	84	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	85
	86	con \|= S3C2410_ADCCON_ENABLE_START;
	87	writel(con, adc->regs + S3C2410_ADCCON);
	88	}
	89
	90	static inline void s3c_adc_select(struct adc_device *adc,
	91	struct s3c_adc_client *client)
	92	{
	93	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	94
e170adcb	95	client->select_cb(client, 1);
28ab44c5 BD	96
	97	con &= ~S3C2410_ADCCON_MUXMASK;
	98	con &= ~S3C2410_ADCCON_STDBM;
	99	con &= ~S3C2410_ADCCON_STARTMASK;
	100
	101	if (!client->is_ts)
	102	con \|= S3C2410_ADCCON_SELMUX(client->channel);
	103
	104	writel(con, adc->regs + S3C2410_ADCCON);
	105	}
	106
	107	static void s3c_adc_dbgshow(struct adc_device *adc)
	108	{
	109	adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
	110	readl(adc->regs + S3C2410_ADCCON),
	111	readl(adc->regs + S3C2410_ADCTSC),
	112	readl(adc->regs + S3C2410_ADCDLY));
	113	}
	114
f8c8ac81	115	static void s3c_adc_try(struct adc_device *adc)
28ab44c5 BD	116	{
	117	struct s3c_adc_client *next = adc->ts_pend;
	118
	119	if (!next && !list_empty(&adc_pending)) {
	120	next = list_first_entry(&adc_pending,
	121	struct s3c_adc_client, pend);
	122	list_del(&next->pend);
	123	} else
	124	adc->ts_pend = NULL;
	125
	126	if (next) {
	127	adc_dbg(adc, "new client is %p\n", next);
	128	adc->cur = next;
	129	s3c_adc_select(adc, next);
	130	s3c_adc_convert(adc);
	131	s3c_adc_dbgshow(adc);
	132	}
	133	}
	134
	135	int s3c_adc_start(struct s3c_adc_client *client,
	136	unsigned int channel, unsigned int nr_samples)
	137	{
	138	struct adc_device *adc = adc_dev;
	139	unsigned long flags;
	140
	141	if (!adc) {
	142	printk(KERN_ERR "%s: failed to find adc\n", __func__);
	143	return -EINVAL;
	144	}
	145
	146	if (client->is_ts && adc->ts_pend)
	147	return -EAGAIN;
	148
1f1f584c	149	spin_lock_irqsave(&adc->lock, flags);
28ab44c5 BD	150
	151	client->channel = channel;
	152	client->nr_samples = nr_samples;
	153
	154	if (client->is_ts)
	155	adc->ts_pend = client;
	156	else
	157	list_add_tail(&client->pend, &adc_pending);
	158
	159	if (!adc->cur)
	160	s3c_adc_try(adc);
1f1f584c BD	161
1f1f584c BD	162	spin_unlock_irqrestore(&adc->lock, flags);
28ab44c5 BD	163
	164	return 0;
	165	}
	166	EXPORT_SYMBOL_GPL(s3c_adc_start);
	167
e170adcb BD	168	static void s3c_convert_done(struct s3c_adc_client *client,
	169	unsigned v, unsigned u, unsigned *left)
	170	{
	171	client->result = v;
	172	wake_up(client->wait);
	173	}
	174
	175	int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
	176	{
	177	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
	178	int ret;
	179
	180	client->convert_cb = s3c_convert_done;
	181	client->wait = &wake;
	182	client->result = -1;
	183
	184	ret = s3c_adc_start(client, ch, 1);
	185	if (ret < 0)
	186	goto err;
	187
	188	ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
	189	if (client->result < 0) {
	190	ret = -ETIMEDOUT;
	191	goto err;
	192	}
	193
	194	client->convert_cb = NULL;
	195	return client->result;
	196
	197	err:
	198	return ret;
	199	}
d3bf3956	200	EXPORT_SYMBOL_GPL(s3c_adc_read);
e170adcb BD	201
	202	static void s3c_adc_default_select(struct s3c_adc_client *client,
	203	unsigned select)
28ab44c5 BD	204	{
	205	}
	206
	207	struct s3c_adc_client s3c_adc_register(struct platform_device pdev,
e170adcb BD	208	void (select)(struct s3c_adc_client client,
	209	unsigned int selected),
	210	void (conv)(struct s3c_adc_client client,
	211	unsigned d0, unsigned d1,
3f7ea467	212	unsigned *samples_left),
28ab44c5 BD	213	unsigned int is_ts)
	214	{
	215	struct s3c_adc_client *client;
	216
	217	WARN_ON(!pdev);
28ab44c5 BD	218
	219	if (!select)
	220	select = s3c_adc_default_select;
	221
e170adcb	222	if (!pdev)
28ab44c5 BD	223	return ERR_PTR(-EINVAL);
	224
	225	client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
	226	if (!client) {
	227	dev_err(&pdev->dev, "no memory for adc client\n");
	228	return ERR_PTR(-ENOMEM);
	229	}
	230
	231	client->pdev = pdev;
	232	client->is_ts = is_ts;
	233	client->select_cb = select;
	234	client->convert_cb = conv;
	235
	236	return client;
	237	}
	238	EXPORT_SYMBOL_GPL(s3c_adc_register);
	239
	240	void s3c_adc_release(struct s3c_adc_client *client)
	241	{
1f1f584c BD	242	unsigned long flags;
	243
	244	spin_lock_irqsave(&adc_dev->lock, flags);
	245
28ab44c5	246	/* We should really check that nothing is in progress. */
0c3ee078 RL	247	if (adc_dev->cur == client)
	248	adc_dev->cur = NULL;
	249	if (adc_dev->ts_pend == client)
	250	adc_dev->ts_pend = NULL;
	251	else {
	252	struct list_head p, n;
	253	struct s3c_adc_client *tmp;
	254
	255	list_for_each_safe(p, n, &adc_pending) {
	256	tmp = list_entry(p, struct s3c_adc_client, pend);
	257	if (tmp == client)
	258	list_del(&tmp->pend);
	259	}
	260	}
	261
	262	if (adc_dev->cur == NULL)
	263	s3c_adc_try(adc_dev);
1f1f584c BD	264
1f1f584c BD	265	spin_unlock_irqrestore(&adc_dev->lock, flags);
28ab44c5 BD	266	kfree(client);
	267	}
	268	EXPORT_SYMBOL_GPL(s3c_adc_release);
	269
	270	static irqreturn_t s3c_adc_irq(int irq, void *pw)
	271	{
	272	struct adc_device *adc = pw;
	273	struct s3c_adc_client *client = adc->cur;
91492b4a	274	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
28ab44c5 BD	275	unsigned data0, data1;
	276
	277	if (!client) {
	278	dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
bcedfa98	279	goto exit;
28ab44c5 BD	280	}
	281
	282	data0 = readl(adc->regs + S3C2410_ADCDAT0);
	283	data1 = readl(adc->regs + S3C2410_ADCDAT1);
	284	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
	285
3f7ea467	286	client->nr_samples--;
e170adcb	287
91492b4a MC	288	if (cpu == TYPE_S3C64XX) {
	289	/* S3C64XX ADC resolution is 12-bit */
	290	data0 &= 0xfff;
	291	data1 &= 0xfff;
	292	} else {
	293	data0 &= 0x3ff;
	294	data1 &= 0x3ff;
	295	}
	296
e170adcb	297	if (client->convert_cb)
91492b4a	298	(client->convert_cb)(client, data0, data1, &client->nr_samples);
28ab44c5	299
3f7ea467	300	if (client->nr_samples > 0) {
28ab44c5 BD	301	/* fire another conversion for this */
28ab44c5 BD	302
e170adcb	303	client->select_cb(client, 1);
28ab44c5 BD	304	s3c_adc_convert(adc);
28ab44c5 BD	305	} else {
1f1f584c	306	spin_lock(&adc->lock);
e170adcb	307	(client->select_cb)(client, 0);
28ab44c5 BD	308	adc->cur = NULL;
	309
	310	s3c_adc_try(adc);
1f1f584c	311	spin_unlock(&adc->lock);
28ab44c5 BD	312	}
28ab44c5 BD	313
bcedfa98	314	exit:
91492b4a	315	if (cpu == TYPE_S3C64XX) {
bcedfa98 MC	316	/* Clear ADC interrupt */
	317	writel(0, adc->regs + S3C64XX_ADCCLRINT);
	318	}
28ab44c5 BD	319	return IRQ_HANDLED;
	320	}
	321
	322	static int s3c_adc_probe(struct platform_device *pdev)
	323	{
	324	struct device *dev = &pdev->dev;
	325	struct adc_device *adc;
	326	struct resource *regs;
	327	int ret;
91492b4a	328	unsigned tmp;
28ab44c5 BD	329
	330	adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
	331	if (adc == NULL) {
	332	dev_err(dev, "failed to allocate adc_device\n");
	333	return -ENOMEM;
	334	}
	335
1f1f584c BD	336	spin_lock_init(&adc->lock);
1f1f584c BD	337
28ab44c5 BD	338	adc->pdev = pdev;
	339	adc->prescale = S3C2410_ADCCON_PRSCVL(49);
	340
	341	adc->irq = platform_get_irq(pdev, 1);
	342	if (adc->irq <= 0) {
	343	dev_err(dev, "failed to get adc irq\n");
	344	ret = -ENOENT;
	345	goto err_alloc;
	346	}
	347
	348	ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
	349	if (ret < 0) {
	350	dev_err(dev, "failed to attach adc irq\n");
	351	goto err_alloc;
	352	}
	353
	354	adc->clk = clk_get(dev, "adc");
	355	if (IS_ERR(adc->clk)) {
	356	dev_err(dev, "failed to get adc clock\n");
	357	ret = PTR_ERR(adc->clk);
	358	goto err_irq;
	359	}
	360
	361	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	362	if (!regs) {
	363	dev_err(dev, "failed to find registers\n");
	364	ret = -ENXIO;
	365	goto err_clk;
	366	}
	367
	368	adc->regs = ioremap(regs->start, resource_size(regs));
	369	if (!adc->regs) {
	370	dev_err(dev, "failed to map registers\n");
	371	ret = -ENXIO;
	372	goto err_clk;
	373	}
	374
	375	clk_enable(adc->clk);
	376
91492b4a MC	377	tmp = adc->prescale \| S3C2410_ADCCON_PRSCEN;
	378	if (platform_get_device_id(pdev)->driver_data == TYPE_S3C64XX) {
	379	/* Enable 12-bit ADC resolution */
	380	tmp \|= S3C64XX_ADCCON_RESSEL;
	381	}
	382	writel(tmp, adc->regs + S3C2410_ADCCON);
28ab44c5 BD	383
	384	dev_info(dev, "attached adc driver\n");
	385
	386	platform_set_drvdata(pdev, adc);
	387	adc_dev = adc;
	388
	389	return 0;
	390
	391	err_clk:
	392	clk_put(adc->clk);
	393
	394	err_irq:
	395	free_irq(adc->irq, adc);
	396
	397	err_alloc:
	398	kfree(adc);
	399	return ret;
	400	}
	401
ad4e22fa	402	static int __devexit s3c_adc_remove(struct platform_device *pdev)
28ab44c5 BD	403	{
	404	struct adc_device *adc = platform_get_drvdata(pdev);
	405
	406	iounmap(adc->regs);
	407	free_irq(adc->irq, adc);
	408	clk_disable(adc->clk);
	409	clk_put(adc->clk);
	410	kfree(adc);
	411
	412	return 0;
	413	}
	414
	415	#ifdef CONFIG_PM
	416	static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
	417	{
	418	struct adc_device *adc = platform_get_drvdata(pdev);
1f1f584c	419	unsigned long flags;
28ab44c5 BD	420	u32 con;
28ab44c5 BD	421
1f1f584c BD	422	spin_lock_irqsave(&adc->lock, flags);
1f1f584c BD	423
28ab44c5 BD	424	con = readl(adc->regs + S3C2410_ADCCON);
	425	con \|= S3C2410_ADCCON_STDBM;
	426	writel(con, adc->regs + S3C2410_ADCCON);
	427
a0af8b3c	428	disable_irq(adc->irq);
1f1f584c	429	spin_unlock_irqrestore(&adc->lock, flags);
28ab44c5 BD	430	clk_disable(adc->clk);
	431
	432	return 0;
	433	}
	434
	435	static int s3c_adc_resume(struct platform_device *pdev)
	436	{
	437	struct adc_device *adc = platform_get_drvdata(pdev);
	438
	439	clk_enable(adc->clk);
a0af8b3c	440	enable_irq(adc->irq);
28ab44c5 BD	441
	442	writel(adc->prescale \| S3C2410_ADCCON_PRSCEN,
	443	adc->regs + S3C2410_ADCCON);
	444
	445	return 0;
	446	}
	447
	448	#else
	449	#define s3c_adc_suspend NULL
	450	#define s3c_adc_resume NULL
	451	#endif
	452
bcedfa98 MC	453	static struct platform_device_id s3c_adc_driver_ids[] = {
	454	{
	455	.name = "s3c24xx-adc",
	456	.driver_data = TYPE_S3C24XX,
	457	}, {
	458	.name = "s3c64xx-adc",
	459	.driver_data = TYPE_S3C64XX,
	460	},
	461	{ }
	462	};
	463	MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
	464
28ab44c5	465	static struct platform_driver s3c_adc_driver = {
bcedfa98	466	.id_table = s3c_adc_driver_ids,
28ab44c5	467	.driver = {
bcedfa98	468	.name = "s3c-adc",
28ab44c5 BD	469	.owner = THIS_MODULE,
	470	},
	471	.probe = s3c_adc_probe,
	472	.remove = __devexit_p(s3c_adc_remove),
	473	.suspend = s3c_adc_suspend,
	474	.resume = s3c_adc_resume,
	475	};
	476
	477	static int __init adc_init(void)
	478	{
	479	int ret;
	480
	481	ret = platform_driver_register(&s3c_adc_driver);
	482	if (ret)
	483	printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
	484
	485	return ret;
	486	}
	487
	488	arch_initcall(adc_init);