[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/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/regulator/consumer.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_ADCV1, /* S3C24XX */
	TYPE_ADCV11, /* S3C2443 */
	TYPE_ADCV12, /* S3C2416, S3C2450 */
	TYPE_ADCV2, /* S3C64XX, S5P64X0, S5PC100 */
	TYPE_ADCV3, /* S5PV210, S5PC110, EXYNOS4210 */
};

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;
	struct regulator	*vdd;
};

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);
	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;

	client->select_cb(client, 1);

	if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV2)
		con &= ~S3C2410_ADCCON_MUXMASK;
	con &= ~S3C2410_ADCCON_STDBM;
	con &= ~S3C2410_ADCCON_STARTMASK;

	if (!client->is_ts) {
		if (cpu == TYPE_ADCV3)
			writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);
		else if (cpu == TYPE_ADCV11 || cpu == TYPE_ADCV12)
			writel(client->channel & 0xf,
						adc->regs + S3C2443_ADCMUX);
		else
			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;
	}

	spin_lock_irqsave(&adc->lock, flags);

	if (client->is_ts && adc->ts_pend) {
		spin_unlock_irqrestore(&adc->lock, flags);
		return -EAGAIN;
	}

	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_ADCV1 || cpu == TYPE_ADCV11) {
		data0 &= 0x3ff;
		data1 &= 0x3ff;
	} else {
		/* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */
		data0 &= 0xfff;
		data1 &= 0xfff;
	}

	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_ADCV2 || cpu == TYPE_ADCV3) {
		/* 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;
	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
	int ret;
	unsigned tmp;

	adc = devm_kzalloc(dev, 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->vdd = devm_regulator_get(dev, "vdd");
	if (IS_ERR(adc->vdd)) {
		dev_err(dev, "operating without regulator \"vdd\" .\n");
		return PTR_ERR(adc->vdd);
	}

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

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

	adc->clk = devm_clk_get(dev, "adc");
	if (IS_ERR(adc->clk)) {
		dev_err(dev, "failed to get adc clock\n");
		return PTR_ERR(adc->clk);
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	adc->regs = devm_ioremap_resource(dev, regs);
	if (IS_ERR(adc->regs))
		return PTR_ERR(adc->regs);

	ret = regulator_enable(adc->vdd);
	if (ret)
		return ret;

	clk_enable(adc->clk);

	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;

	/* Enable 12-bit ADC resolution */
	if (cpu == TYPE_ADCV12)
		tmp |= S3C2416_ADCCON_RESSEL;
	if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
		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;
}

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

	clk_disable(adc->clk);
	regulator_disable(adc->vdd);

	return 0;
}

#ifdef CONFIG_PM
static int s3c_adc_suspend(struct device *dev)
{
	struct platform_device *pdev = container_of(dev,
			struct platform_device, dev);
	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);
	regulator_disable(adc->vdd);

	return 0;
}

static int s3c_adc_resume(struct device *dev)
{
	struct platform_device *pdev = container_of(dev,
			struct platform_device, dev);
	struct adc_device *adc = platform_get_drvdata(pdev);
	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
	int ret;
	unsigned long tmp;

	ret = regulator_enable(adc->vdd);
	if (ret)
		return ret;
	clk_enable(adc->clk);
	enable_irq(adc->irq);

	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;

	/* Enable 12-bit ADC resolution */
	if (cpu == TYPE_ADCV12)
		tmp |= S3C2416_ADCCON_RESSEL;
	if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
		tmp |= S3C64XX_ADCCON_RESSEL;

	writel(tmp, 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_ADCV1,
	}, {
		.name		= "s3c2443-adc",
		.driver_data	= TYPE_ADCV11,
	}, {
		.name		= "s3c2416-adc",
		.driver_data	= TYPE_ADCV12,
	}, {
		.name           = "s3c64xx-adc",
		.driver_data    = TYPE_ADCV2,
	}, {
		.name		= "samsung-adc-v3",
		.driver_data	= TYPE_ADCV3,
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);

static const struct dev_pm_ops adc_pm_ops = {
	.suspend	= s3c_adc_suspend,
	.resume		= s3c_adc_resume,
};

static struct platform_driver s3c_adc_driver = {
	.id_table	= s3c_adc_driver_ids,
	.driver		= {
		.name	= "s3c-adc",
		.owner	= THIS_MODULE,
		.pm	= &adc_pm_ops,
	},
	.probe		= s3c_adc_probe,
	.remove		= s3c_adc_remove,
};

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;
}

module_init(adc_init);
Commit	Line	Data
	1	/* arch/arm/plat-samsung/adc.c
	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	*
	7	* Samsung ADC device core
	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>
	17	#include <linux/sched.h>
	18	#include <linux/list.h>
	19	#include <linux/slab.h>
	20	#include <linux/err.h>
	21	#include <linux/clk.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/io.h>
	24	#include <linux/regulator/consumer.h>
	25
	26	#include <plat/regs-adc.h>
	27	#include <plat/adc.h>
	28
	29	/* This driver is designed to control the usage of the ADC block between
	30	* the touchscreen and any other drivers that may need to use it, such as
	31	* the hwmon driver.
	32	*
	33	* Priority will be given to the touchscreen driver, but as this itself is
	34	* rate limited it should not starve other requests which are processed in
	35	* order that they are received.
	36	*
	37	* Each user registers to get a client block which uniquely identifies it
	38	* and stores information such as the necessary functions to callback when
	39	* action is required.
	40	*/
	41
	42	enum s3c_cpu_type {
	43	TYPE_ADCV1, /* S3C24XX */
	44	TYPE_ADCV11, /* S3C2443 */
	45	TYPE_ADCV12, /* S3C2416, S3C2450 */
	46	TYPE_ADCV2, /* S3C64XX, S5P64X0, S5PC100 */
	47	TYPE_ADCV3, /* S5PV210, S5PC110, EXYNOS4210 */
	48	};
	49
	50	struct s3c_adc_client {
	51	struct platform_device *pdev;
	52	struct list_head pend;
	53	wait_queue_head_t *wait;
	54
	55	unsigned int nr_samples;
	56	int result;
	57	unsigned char is_ts;
	58	unsigned char channel;
	59
	60	void (select_cb)(struct s3c_adc_client c, unsigned selected);
	61	void (convert_cb)(struct s3c_adc_client c,
	62	unsigned val1, unsigned val2,
	63	unsigned *samples_left);
	64	};
	65
	66	struct adc_device {
	67	struct platform_device *pdev;
	68	struct platform_device *owner;
	69	struct clk *clk;
	70	struct s3c_adc_client *cur;
	71	struct s3c_adc_client *ts_pend;
	72	void __iomem *regs;
	73	spinlock_t lock;
	74
	75	unsigned int prescale;
	76
	77	int irq;
	78	struct regulator *vdd;
	79	};
	80
	81	static struct adc_device *adc_dev;
	82
	83	static LIST_HEAD(adc_pending); /* protected by adc_device.lock */
	84
	85	#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
	86
	87	static inline void s3c_adc_convert(struct adc_device *adc)
	88	{
	89	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	90
	91	con \|= S3C2410_ADCCON_ENABLE_START;
	92	writel(con, adc->regs + S3C2410_ADCCON);
	93	}
	94
	95	static inline void s3c_adc_select(struct adc_device *adc,
	96	struct s3c_adc_client *client)
	97	{
	98	unsigned con = readl(adc->regs + S3C2410_ADCCON);
	99	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
	100
	101	client->select_cb(client, 1);
	102
	103	if (cpu == TYPE_ADCV1 \|\| cpu == TYPE_ADCV2)
	104	con &= ~S3C2410_ADCCON_MUXMASK;
	105	con &= ~S3C2410_ADCCON_STDBM;
	106	con &= ~S3C2410_ADCCON_STARTMASK;
	107
	108	if (!client->is_ts) {
	109	if (cpu == TYPE_ADCV3)
	110	writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);
	111	else if (cpu == TYPE_ADCV11 \|\| cpu == TYPE_ADCV12)
	112	writel(client->channel & 0xf,
	113	adc->regs + S3C2443_ADCMUX);
	114	else
	115	con \|= S3C2410_ADCCON_SELMUX(client->channel);
	116	}
	117
	118	writel(con, adc->regs + S3C2410_ADCCON);
	119	}
	120
	121	static void s3c_adc_dbgshow(struct adc_device *adc)
	122	{
	123	adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
	124	readl(adc->regs + S3C2410_ADCCON),
	125	readl(adc->regs + S3C2410_ADCTSC),
	126	readl(adc->regs + S3C2410_ADCDLY));
	127	}
	128
	129	static void s3c_adc_try(struct adc_device *adc)
	130	{
	131	struct s3c_adc_client *next = adc->ts_pend;
	132
	133	if (!next && !list_empty(&adc_pending)) {
	134	next = list_first_entry(&adc_pending,
	135	struct s3c_adc_client, pend);
	136	list_del(&next->pend);
	137	} else
	138	adc->ts_pend = NULL;
	139
	140	if (next) {
	141	adc_dbg(adc, "new client is %p\n", next);
	142	adc->cur = next;
	143	s3c_adc_select(adc, next);
	144	s3c_adc_convert(adc);
	145	s3c_adc_dbgshow(adc);
	146	}
	147	}
	148
	149	int s3c_adc_start(struct s3c_adc_client *client,
	150	unsigned int channel, unsigned int nr_samples)
	151	{
	152	struct adc_device *adc = adc_dev;
	153	unsigned long flags;
	154
	155	if (!adc) {
	156	printk(KERN_ERR "%s: failed to find adc\n", __func__);
	157	return -EINVAL;
	158	}
	159
	160	spin_lock_irqsave(&adc->lock, flags);
	161
	162	if (client->is_ts && adc->ts_pend) {
	163	spin_unlock_irqrestore(&adc->lock, flags);
	164	return -EAGAIN;
	165	}
	166
	167	client->channel = channel;
	168	client->nr_samples = nr_samples;
	169
	170	if (client->is_ts)
	171	adc->ts_pend = client;
	172	else
	173	list_add_tail(&client->pend, &adc_pending);
	174
	175	if (!adc->cur)
	176	s3c_adc_try(adc);
	177
	178	spin_unlock_irqrestore(&adc->lock, flags);
	179
	180	return 0;
	181	}
	182	EXPORT_SYMBOL_GPL(s3c_adc_start);
	183
	184	static void s3c_convert_done(struct s3c_adc_client *client,
	185	unsigned v, unsigned u, unsigned *left)
	186	{
	187	client->result = v;
	188	wake_up(client->wait);
	189	}
	190
	191	int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
	192	{
	193	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
	194	int ret;
	195
	196	client->convert_cb = s3c_convert_done;
	197	client->wait = &wake;
	198	client->result = -1;
	199
	200	ret = s3c_adc_start(client, ch, 1);
	201	if (ret < 0)
	202	goto err;
	203
	204	ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
	205	if (client->result < 0) {
	206	ret = -ETIMEDOUT;
	207	goto err;
	208	}
	209
	210	client->convert_cb = NULL;
	211	return client->result;
	212
	213	err:
	214	return ret;
	215	}
	216	EXPORT_SYMBOL_GPL(s3c_adc_read);
	217
	218	static void s3c_adc_default_select(struct s3c_adc_client *client,
	219	unsigned select)
	220	{
	221	}
	222
	223	struct s3c_adc_client s3c_adc_register(struct platform_device pdev,
	224	void (select)(struct s3c_adc_client client,
	225	unsigned int selected),
	226	void (conv)(struct s3c_adc_client client,
	227	unsigned d0, unsigned d1,
	228	unsigned *samples_left),
	229	unsigned int is_ts)
	230	{
	231	struct s3c_adc_client *client;
	232
	233	WARN_ON(!pdev);
	234
	235	if (!select)
	236	select = s3c_adc_default_select;
	237
	238	if (!pdev)
	239	return ERR_PTR(-EINVAL);
	240
	241	client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
	242	if (!client) {
	243	dev_err(&pdev->dev, "no memory for adc client\n");
	244	return ERR_PTR(-ENOMEM);
	245	}
	246
	247	client->pdev = pdev;
	248	client->is_ts = is_ts;
	249	client->select_cb = select;
	250	client->convert_cb = conv;
	251
	252	return client;
	253	}
	254	EXPORT_SYMBOL_GPL(s3c_adc_register);
	255
	256	void s3c_adc_release(struct s3c_adc_client *client)
	257	{
	258	unsigned long flags;
	259
	260	spin_lock_irqsave(&adc_dev->lock, flags);
	261
	262	/* We should really check that nothing is in progress. */
	263	if (adc_dev->cur == client)
	264	adc_dev->cur = NULL;
	265	if (adc_dev->ts_pend == client)
	266	adc_dev->ts_pend = NULL;
	267	else {
	268	struct list_head p, n;
	269	struct s3c_adc_client *tmp;
	270
	271	list_for_each_safe(p, n, &adc_pending) {
	272	tmp = list_entry(p, struct s3c_adc_client, pend);
	273	if (tmp == client)
	274	list_del(&tmp->pend);
	275	}
	276	}
	277
	278	if (adc_dev->cur == NULL)
	279	s3c_adc_try(adc_dev);
	280
	281	spin_unlock_irqrestore(&adc_dev->lock, flags);
	282	kfree(client);
	283	}
	284	EXPORT_SYMBOL_GPL(s3c_adc_release);
	285
	286	static irqreturn_t s3c_adc_irq(int irq, void *pw)
	287	{
	288	struct adc_device *adc = pw;
	289	struct s3c_adc_client *client = adc->cur;
	290	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
	291	unsigned data0, data1;
	292
	293	if (!client) {
	294	dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
	295	goto exit;
	296	}
	297
	298	data0 = readl(adc->regs + S3C2410_ADCDAT0);
	299	data1 = readl(adc->regs + S3C2410_ADCDAT1);
	300	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
	301
	302	client->nr_samples--;
	303
	304	if (cpu == TYPE_ADCV1 \|\| cpu == TYPE_ADCV11) {
	305	data0 &= 0x3ff;
	306	data1 &= 0x3ff;
	307	} else {
	308	/* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */
	309	data0 &= 0xfff;
	310	data1 &= 0xfff;
	311	}
	312
	313	if (client->convert_cb)
	314	(client->convert_cb)(client, data0, data1, &client->nr_samples);
	315
	316	if (client->nr_samples > 0) {
	317	/* fire another conversion for this */
	318
	319	client->select_cb(client, 1);
	320	s3c_adc_convert(adc);
	321	} else {
	322	spin_lock(&adc->lock);
	323	(client->select_cb)(client, 0);
	324	adc->cur = NULL;
	325
	326	s3c_adc_try(adc);
	327	spin_unlock(&adc->lock);
	328	}
	329
	330	exit:
	331	if (cpu == TYPE_ADCV2 \|\| cpu == TYPE_ADCV3) {
	332	/* Clear ADC interrupt */
	333	writel(0, adc->regs + S3C64XX_ADCCLRINT);
	334	}
	335	return IRQ_HANDLED;
	336	}
	337
	338	static int s3c_adc_probe(struct platform_device *pdev)
	339	{
	340	struct device *dev = &pdev->dev;
	341	struct adc_device *adc;
	342	struct resource *regs;
	343	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
	344	int ret;
	345	unsigned tmp;
	346
	347	adc = devm_kzalloc(dev, sizeof(struct adc_device), GFP_KERNEL);
	348	if (adc == NULL) {
	349	dev_err(dev, "failed to allocate adc_device\n");
	350	return -ENOMEM;
	351	}
	352
	353	spin_lock_init(&adc->lock);
	354
	355	adc->pdev = pdev;
	356	adc->prescale = S3C2410_ADCCON_PRSCVL(49);
	357
	358	adc->vdd = devm_regulator_get(dev, "vdd");
	359	if (IS_ERR(adc->vdd)) {
	360	dev_err(dev, "operating without regulator \"vdd\" .\n");
	361	return PTR_ERR(adc->vdd);
	362	}
	363
	364	adc->irq = platform_get_irq(pdev, 1);
	365	if (adc->irq <= 0) {
	366	dev_err(dev, "failed to get adc irq\n");
	367	return -ENOENT;
	368	}
	369
	370	ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev),
	371	adc);
	372	if (ret < 0) {
	373	dev_err(dev, "failed to attach adc irq\n");
	374	return ret;
	375	}
	376
	377	adc->clk = devm_clk_get(dev, "adc");
	378	if (IS_ERR(adc->clk)) {
	379	dev_err(dev, "failed to get adc clock\n");
	380	return PTR_ERR(adc->clk);
	381	}
	382
	383	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	384	adc->regs = devm_ioremap_resource(dev, regs);
	385	if (IS_ERR(adc->regs))
	386	return PTR_ERR(adc->regs);
	387
	388	ret = regulator_enable(adc->vdd);
	389	if (ret)
	390	return ret;
	391
	392	clk_enable(adc->clk);
	393
	394	tmp = adc->prescale \| S3C2410_ADCCON_PRSCEN;
	395
	396	/* Enable 12-bit ADC resolution */
	397	if (cpu == TYPE_ADCV12)
	398	tmp \|= S3C2416_ADCCON_RESSEL;
	399	if (cpu == TYPE_ADCV2 \|\| cpu == TYPE_ADCV3)
	400	tmp \|= S3C64XX_ADCCON_RESSEL;
	401
	402	writel(tmp, adc->regs + S3C2410_ADCCON);
	403
	404	dev_info(dev, "attached adc driver\n");
	405
	406	platform_set_drvdata(pdev, adc);
	407	adc_dev = adc;
	408
	409	return 0;
	410	}
	411
	412	static int s3c_adc_remove(struct platform_device *pdev)
	413	{
	414	struct adc_device *adc = platform_get_drvdata(pdev);
	415
	416	clk_disable(adc->clk);
	417	regulator_disable(adc->vdd);
	418
	419	return 0;
	420	}
	421
	422	#ifdef CONFIG_PM
	423	static int s3c_adc_suspend(struct device *dev)
	424	{
	425	struct platform_device *pdev = container_of(dev,
	426	struct platform_device, dev);
	427	struct adc_device *adc = platform_get_drvdata(pdev);
	428	unsigned long flags;
	429	u32 con;
	430
	431	spin_lock_irqsave(&adc->lock, flags);
	432
	433	con = readl(adc->regs + S3C2410_ADCCON);
	434	con \|= S3C2410_ADCCON_STDBM;
	435	writel(con, adc->regs + S3C2410_ADCCON);
	436
	437	disable_irq(adc->irq);
	438	spin_unlock_irqrestore(&adc->lock, flags);
	439	clk_disable(adc->clk);
	440	regulator_disable(adc->vdd);
	441
	442	return 0;
	443	}
	444
	445	static int s3c_adc_resume(struct device *dev)
	446	{
	447	struct platform_device *pdev = container_of(dev,
	448	struct platform_device, dev);
	449	struct adc_device *adc = platform_get_drvdata(pdev);
	450	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
	451	int ret;
	452	unsigned long tmp;
	453
	454	ret = regulator_enable(adc->vdd);
	455	if (ret)
	456	return ret;
	457	clk_enable(adc->clk);
	458	enable_irq(adc->irq);
	459
	460	tmp = adc->prescale \| S3C2410_ADCCON_PRSCEN;
	461
	462	/* Enable 12-bit ADC resolution */
	463	if (cpu == TYPE_ADCV12)
	464	tmp \|= S3C2416_ADCCON_RESSEL;
	465	if (cpu == TYPE_ADCV2 \|\| cpu == TYPE_ADCV3)
	466	tmp \|= S3C64XX_ADCCON_RESSEL;
	467
	468	writel(tmp, adc->regs + S3C2410_ADCCON);
	469
	470	return 0;
	471	}
	472
	473	#else
	474	#define s3c_adc_suspend NULL
	475	#define s3c_adc_resume NULL
	476	#endif
	477
	478	static struct platform_device_id s3c_adc_driver_ids[] = {
	479	{
	480	.name = "s3c24xx-adc",
	481	.driver_data = TYPE_ADCV1,
	482	}, {
	483	.name = "s3c2443-adc",
	484	.driver_data = TYPE_ADCV11,
	485	}, {
	486	.name = "s3c2416-adc",
	487	.driver_data = TYPE_ADCV12,
	488	}, {
	489	.name = "s3c64xx-adc",
	490	.driver_data = TYPE_ADCV2,
	491	}, {
	492	.name = "samsung-adc-v3",
	493	.driver_data = TYPE_ADCV3,
	494	},
	495	{ }
	496	};
	497	MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
	498
	499	static const struct dev_pm_ops adc_pm_ops = {
	500	.suspend = s3c_adc_suspend,
	501	.resume = s3c_adc_resume,
	502	};
	503
	504	static struct platform_driver s3c_adc_driver = {
	505	.id_table = s3c_adc_driver_ids,
	506	.driver = {
	507	.name = "s3c-adc",
	508	.owner = THIS_MODULE,
	509	.pm = &adc_pm_ops,
	510	},
	511	.probe = s3c_adc_probe,
	512	.remove = s3c_adc_remove,
	513	};
	514
	515	static int __init adc_init(void)
	516	{
	517	int ret;
	518
	519	ret = platform_driver_register(&s3c_adc_driver);
	520	if (ret)
	521	printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
	522
	523	return ret;
	524	}
	525
	526	module_init(adc_init);