[mirror_ubuntu-bionic-kernel.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;

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