drivers/input/touchscreen/w90p910_ts.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2008 Nuvoton technology corporation.
  *
  * Wan ZongShun <mcuos.com@gmail.com>
  *
  * 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;version 2 of the License.
  *
  */

 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>

 /* ADC controller bit defines */
 #define ADC_DELAY	0xf00
 #define ADC_DOWN	0x01
 #define ADC_TSC_Y	(0x01 << 8)
 #define ADC_TSC_X	(0x00 << 8)
 #define TSC_FOURWIRE	(~(0x03 << 1))
 #define ADC_CLK_EN	(0x01 << 28)	/* ADC clock enable */
 #define ADC_READ_CON	(0x01 << 12)
 #define ADC_CONV	(0x01 << 13)
 #define ADC_SEMIAUTO	(0x01 << 14)
 #define ADC_WAITTRIG	(0x03 << 14)
 #define ADC_RST1	(0x01 << 16)
 #define ADC_RST0	(0x00 << 16)
 #define ADC_EN		(0x01 << 17)
 #define ADC_INT		(0x01 << 18)
 #define WT_INT		(0x01 << 20)
 #define ADC_INT_EN	(0x01 << 21)
 #define LVD_INT_EN	(0x01 << 22)
 #define WT_INT_EN	(0x01 << 23)
 #define ADC_DIV		(0x04 << 1)	/* div = 6 */

 enum ts_state {
 	TS_WAIT_NEW_PACKET,	/* We are waiting next touch report */
 	TS_WAIT_X_COORD,	/* We are waiting for ADC to report X coord */
 	TS_WAIT_Y_COORD,	/* We are waiting for ADC to report Y coord */
 	TS_IDLE,		/* Input device is closed, don't do anything */
 };

 struct w90p910_ts {
 	struct input_dev *input;
 	struct timer_list timer;
 	struct clk *clk;
 	int irq_num;
 	void __iomem *ts_reg;
 	spinlock_t lock;
 	enum ts_state state;
 };

 static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
 {
 	struct input_dev *dev = w90p910_ts->input;

 	if (down) {
 		input_report_abs(dev, ABS_X,
 				 __raw_readl(w90p910_ts->ts_reg + 0x0c));
 		input_report_abs(dev, ABS_Y,
 				 __raw_readl(w90p910_ts->ts_reg + 0x10));
 	}

 	input_report_key(dev, BTN_TOUCH, down);
 	input_sync(dev);
 }

 static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
 {
 	unsigned long ctlreg;

 	__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
 	ctlreg = __raw_readl(w90p910_ts->ts_reg);
 	ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN);
 	ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
 	__raw_writel(ctlreg, w90p910_ts->ts_reg);

 	w90p910_ts->state = TS_WAIT_X_COORD;
 }

 static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
 {
 	unsigned long ctlreg;

 	__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
 	ctlreg = __raw_readl(w90p910_ts->ts_reg);
 	ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN);
 	ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
 	__raw_writel(ctlreg, w90p910_ts->ts_reg);

 	w90p910_ts->state = TS_WAIT_Y_COORD;
 }

 static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
 {
 	unsigned long ctlreg;

 	ctlreg = __raw_readl(w90p910_ts->ts_reg);
 	ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV);
 	ctlreg |= ADC_WAITTRIG | WT_INT_EN;
 	__raw_writel(ctlreg, w90p910_ts->ts_reg);

 	w90p910_ts->state = TS_WAIT_NEW_PACKET;
 }

 static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
 {
 	struct w90p910_ts *w90p910_ts = dev_id;
 	unsigned long flags;

 	spin_lock_irqsave(&w90p910_ts->lock, flags);

 	switch (w90p910_ts->state) {
 	case TS_WAIT_NEW_PACKET:
 		/*
 		 * The controller only generates interrupts when pen
 		 * is down.
 		 */
 		del_timer(&w90p910_ts->timer);
 		w90p910_prepare_x_reading(w90p910_ts);
 		break;


 	case TS_WAIT_X_COORD:
 		w90p910_prepare_y_reading(w90p910_ts);
 		break;

 	case TS_WAIT_Y_COORD:
 		w90p910_report_event(w90p910_ts, true);
 		w90p910_prepare_next_packet(w90p910_ts);
 		mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
 		break;

 	case TS_IDLE:
 		break;
 	}

 	spin_unlock_irqrestore(&w90p910_ts->lock, flags);

 	return IRQ_HANDLED;
 }

 static void w90p910_check_pen_up(unsigned long data)
 {
 	struct w90p910_ts *w90p910_ts = (struct w90p910_ts *) data;
 	unsigned long flags;

 	spin_lock_irqsave(&w90p910_ts->lock, flags);

 	if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
 	    !(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {

 		w90p910_report_event(w90p910_ts, false);
 	}

 	spin_unlock_irqrestore(&w90p910_ts->lock, flags);
 }

 static int w90p910_open(struct input_dev *dev)
 {
 	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
 	unsigned long val;

 	/* enable the ADC clock */
 	clk_enable(w90p910_ts->clk);

 	__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
 	msleep(1);
 	__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
 	msleep(1);

 	/* set delay and screen type */
 	val = __raw_readl(w90p910_ts->ts_reg + 0x04);
 	__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
 	__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);

 	w90p910_ts->state = TS_WAIT_NEW_PACKET;
 	wmb();

 	/* set trigger mode */
 	val = __raw_readl(w90p910_ts->ts_reg);
 	val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN;
 	__raw_writel(val, w90p910_ts->ts_reg);

 	return 0;
 }

 static void w90p910_close(struct input_dev *dev)
 {
 	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
 	unsigned long val;

 	/* disable trigger mode */

 	spin_lock_irq(&w90p910_ts->lock);

 	w90p910_ts->state = TS_IDLE;

 	val = __raw_readl(w90p910_ts->ts_reg);
 	val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN);
 	__raw_writel(val, w90p910_ts->ts_reg);

 	spin_unlock_irq(&w90p910_ts->lock);

 	/* Now that interrupts are shut off we can safely delete timer */
 	del_timer_sync(&w90p910_ts->timer);

 	/* stop the ADC clock */
 	clk_disable(w90p910_ts->clk);
 }

 static int w90x900ts_probe(struct platform_device *pdev)
 {
 	struct w90p910_ts *w90p910_ts;
 	struct input_dev *input_dev;
 	struct resource *res;
 	int err;

 	w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!w90p910_ts || !input_dev) {
 		err = -ENOMEM;
 		goto fail1;
 	}

 	w90p910_ts->input = input_dev;
 	w90p910_ts->state = TS_IDLE;
 	spin_lock_init(&w90p910_ts->lock);
 	setup_timer(&w90p910_ts->timer, w90p910_check_pen_up,
 		    (unsigned long)w90p910_ts);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		err = -ENXIO;
 		goto fail1;
 	}

 	if (!request_mem_region(res->start, resource_size(res),
 				pdev->name)) {
 		err = -EBUSY;
 		goto fail1;
 	}

 	w90p910_ts->ts_reg = ioremap(res->start, resource_size(res));
 	if (!w90p910_ts->ts_reg) {
 		err = -ENOMEM;
 		goto fail2;
 	}

 	w90p910_ts->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(w90p910_ts->clk)) {
 		err = PTR_ERR(w90p910_ts->clk);
 		goto fail3;
 	}

 	input_dev->name = "W90P910 TouchScreen";
 	input_dev->phys = "w90p910ts/event0";
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor  = 0x0005;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0100;
 	input_dev->dev.parent = &pdev->dev;
 	input_dev->open = w90p910_open;
 	input_dev->close = w90p910_close;

 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

 	input_set_abs_params(input_dev, ABS_X, 0, 0x400, 0, 0);
 	input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);

 	input_set_drvdata(input_dev, w90p910_ts);

 	w90p910_ts->irq_num = platform_get_irq(pdev, 0);
 	if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
 			0, "w90p910ts", w90p910_ts)) {
 		err = -EBUSY;
 		goto fail4;
 	}

 	err = input_register_device(w90p910_ts->input);
 	if (err)
 		goto fail5;

 	platform_set_drvdata(pdev, w90p910_ts);

 	return 0;

 fail5:	free_irq(w90p910_ts->irq_num, w90p910_ts);
 fail4:	clk_put(w90p910_ts->clk);
 fail3:	iounmap(w90p910_ts->ts_reg);
 fail2:	release_mem_region(res->start, resource_size(res));
 fail1:	input_free_device(input_dev);
 	kfree(w90p910_ts);
 	return err;
 }

 static int w90x900ts_remove(struct platform_device *pdev)
 {
 	struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
 	struct resource *res;

 	free_irq(w90p910_ts->irq_num, w90p910_ts);
 	del_timer_sync(&w90p910_ts->timer);
 	iounmap(w90p910_ts->ts_reg);

 	clk_put(w90p910_ts->clk);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));

 	input_unregister_device(w90p910_ts->input);
 	kfree(w90p910_ts);

 	return 0;
 }

 static struct platform_driver w90x900ts_driver = {
 	.probe		= w90x900ts_probe,
 	.remove		= w90x900ts_remove,
 	.driver		= {
 		.name	= "nuc900-ts",
 	},
 };
 module_platform_driver(w90x900ts_driver);

 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 MODULE_DESCRIPTION("w90p910 touch screen driver!");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:nuc900-ts");
	/*
	* Copyright (c) 2008 Nuvoton technology corporation.
	*
	* Wan ZongShun <mcuos.com@gmail.com>
	*
	* 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;version 2 of the License.
	*
	*/

	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/clk.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>

	/* ADC controller bit defines */
	#define ADC_DELAY 0xf00
	#define ADC_DOWN 0x01
	#define ADC_TSC_Y (0x01 << 8)
	#define ADC_TSC_X (0x00 << 8)
	#define TSC_FOURWIRE (~(0x03 << 1))
	#define ADC_CLK_EN (0x01 << 28) /* ADC clock enable */
	#define ADC_READ_CON (0x01 << 12)
	#define ADC_CONV (0x01 << 13)
	#define ADC_SEMIAUTO (0x01 << 14)
	#define ADC_WAITTRIG (0x03 << 14)
	#define ADC_RST1 (0x01 << 16)
	#define ADC_RST0 (0x00 << 16)
	#define ADC_EN (0x01 << 17)
	#define ADC_INT (0x01 << 18)
	#define WT_INT (0x01 << 20)
	#define ADC_INT_EN (0x01 << 21)
	#define LVD_INT_EN (0x01 << 22)
	#define WT_INT_EN (0x01 << 23)
	#define ADC_DIV (0x04 << 1) /* div = 6 */

	enum ts_state {
	TS_WAIT_NEW_PACKET, /* We are waiting next touch report */
	TS_WAIT_X_COORD, /* We are waiting for ADC to report X coord */
	TS_WAIT_Y_COORD, /* We are waiting for ADC to report Y coord */
	TS_IDLE, /* Input device is closed, don't do anything */
	};

	struct w90p910_ts {
	struct input_dev *input;
	struct timer_list timer;
	struct clk *clk;
	int irq_num;
	void __iomem *ts_reg;
	spinlock_t lock;
	enum ts_state state;
	};

	static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
	{
	struct input_dev *dev = w90p910_ts->input;

	if (down) {
	input_report_abs(dev, ABS_X,
	__raw_readl(w90p910_ts->ts_reg + 0x0c));
	input_report_abs(dev, ABS_Y,
	__raw_readl(w90p910_ts->ts_reg + 0x10));
	}

	input_report_key(dev, BTN_TOUCH, down);
	input_sync(dev);
	}

	static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
	{
	unsigned long ctlreg;

	__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
	ctlreg = __raw_readl(w90p910_ts->ts_reg);
	ctlreg &= ~(ADC_WAITTRIG \| WT_INT \| WT_INT_EN);
	ctlreg \|= ADC_SEMIAUTO \| ADC_INT_EN \| ADC_CONV;
	__raw_writel(ctlreg, w90p910_ts->ts_reg);

	w90p910_ts->state = TS_WAIT_X_COORD;
	}

	static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
	{
	unsigned long ctlreg;

	__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
	ctlreg = __raw_readl(w90p910_ts->ts_reg);
	ctlreg &= ~(ADC_WAITTRIG \| ADC_INT \| WT_INT_EN);
	ctlreg \|= ADC_SEMIAUTO \| ADC_INT_EN \| ADC_CONV;
	__raw_writel(ctlreg, w90p910_ts->ts_reg);

	w90p910_ts->state = TS_WAIT_Y_COORD;
	}

	static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
	{
	unsigned long ctlreg;

	ctlreg = __raw_readl(w90p910_ts->ts_reg);
	ctlreg &= ~(ADC_INT \| ADC_INT_EN \| ADC_SEMIAUTO \| ADC_CONV);
	ctlreg \|= ADC_WAITTRIG \| WT_INT_EN;
	__raw_writel(ctlreg, w90p910_ts->ts_reg);

	w90p910_ts->state = TS_WAIT_NEW_PACKET;
	}

	static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
	{
	struct w90p910_ts *w90p910_ts = dev_id;
	unsigned long flags;

	spin_lock_irqsave(&w90p910_ts->lock, flags);

	switch (w90p910_ts->state) {
	case TS_WAIT_NEW_PACKET:
	/*
	* The controller only generates interrupts when pen
	* is down.
	*/
	del_timer(&w90p910_ts->timer);
	w90p910_prepare_x_reading(w90p910_ts);
	break;


	case TS_WAIT_X_COORD:
	w90p910_prepare_y_reading(w90p910_ts);
	break;

	case TS_WAIT_Y_COORD:
	w90p910_report_event(w90p910_ts, true);
	w90p910_prepare_next_packet(w90p910_ts);
	mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
	break;

	case TS_IDLE:
	break;
	}

	spin_unlock_irqrestore(&w90p910_ts->lock, flags);

	return IRQ_HANDLED;
	}

	static void w90p910_check_pen_up(unsigned long data)
	{
	struct w90p910_ts w90p910_ts = (struct w90p910_ts ) data;
	unsigned long flags;

	spin_lock_irqsave(&w90p910_ts->lock, flags);

	if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
	!(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {

	w90p910_report_event(w90p910_ts, false);
	}

	spin_unlock_irqrestore(&w90p910_ts->lock, flags);
	}

	static int w90p910_open(struct input_dev *dev)
	{
	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
	unsigned long val;

	/* enable the ADC clock */
	clk_enable(w90p910_ts->clk);

	__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
	msleep(1);
	__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
	msleep(1);

	/* set delay and screen type */
	val = __raw_readl(w90p910_ts->ts_reg + 0x04);
	__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
	__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);

	w90p910_ts->state = TS_WAIT_NEW_PACKET;
	wmb();

	/* set trigger mode */
	val = __raw_readl(w90p910_ts->ts_reg);
	val \|= ADC_WAITTRIG \| ADC_DIV \| ADC_EN \| WT_INT_EN;
	__raw_writel(val, w90p910_ts->ts_reg);

	return 0;
	}

	static void w90p910_close(struct input_dev *dev)
	{
	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
	unsigned long val;

	/* disable trigger mode */

	spin_lock_irq(&w90p910_ts->lock);

	w90p910_ts->state = TS_IDLE;

	val = __raw_readl(w90p910_ts->ts_reg);
	val &= ~(ADC_WAITTRIG \| ADC_DIV \| ADC_EN \| WT_INT_EN \| ADC_INT_EN);
	__raw_writel(val, w90p910_ts->ts_reg);

	spin_unlock_irq(&w90p910_ts->lock);

	/* Now that interrupts are shut off we can safely delete timer */
	del_timer_sync(&w90p910_ts->timer);

	/* stop the ADC clock */
	clk_disable(w90p910_ts->clk);
	}

	static int w90x900ts_probe(struct platform_device *pdev)
	{
	struct w90p910_ts *w90p910_ts;
	struct input_dev *input_dev;
	struct resource *res;
	int err;

	w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!w90p910_ts \|\| !input_dev) {
	err = -ENOMEM;
	goto fail1;
	}

	w90p910_ts->input = input_dev;
	w90p910_ts->state = TS_IDLE;
	spin_lock_init(&w90p910_ts->lock);
	setup_timer(&w90p910_ts->timer, w90p910_check_pen_up,
	(unsigned long)w90p910_ts);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	err = -ENXIO;
	goto fail1;
	}

	if (!request_mem_region(res->start, resource_size(res),
	pdev->name)) {
	err = -EBUSY;
	goto fail1;
	}

	w90p910_ts->ts_reg = ioremap(res->start, resource_size(res));
	if (!w90p910_ts->ts_reg) {
	err = -ENOMEM;
	goto fail2;
	}

	w90p910_ts->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(w90p910_ts->clk)) {
	err = PTR_ERR(w90p910_ts->clk);
	goto fail3;
	}

	input_dev->name = "W90P910 TouchScreen";
	input_dev->phys = "w90p910ts/event0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0005;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &pdev->dev;
	input_dev->open = w90p910_open;
	input_dev->close = w90p910_close;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X, 0, 0x400, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);

	input_set_drvdata(input_dev, w90p910_ts);

	w90p910_ts->irq_num = platform_get_irq(pdev, 0);
	if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
	0, "w90p910ts", w90p910_ts)) {
	err = -EBUSY;
	goto fail4;
	}

	err = input_register_device(w90p910_ts->input);
	if (err)
	goto fail5;

	platform_set_drvdata(pdev, w90p910_ts);

	return 0;

	fail5: free_irq(w90p910_ts->irq_num, w90p910_ts);
	fail4: clk_put(w90p910_ts->clk);
	fail3: iounmap(w90p910_ts->ts_reg);
	fail2: release_mem_region(res->start, resource_size(res));
	fail1: input_free_device(input_dev);
	kfree(w90p910_ts);
	return err;
	}

	static int w90x900ts_remove(struct platform_device *pdev)
	{
	struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
	struct resource *res;

	free_irq(w90p910_ts->irq_num, w90p910_ts);
	del_timer_sync(&w90p910_ts->timer);
	iounmap(w90p910_ts->ts_reg);

	clk_put(w90p910_ts->clk);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	input_unregister_device(w90p910_ts->input);
	kfree(w90p910_ts);

	return 0;
	}

	static struct platform_driver w90x900ts_driver = {
	.probe = w90x900ts_probe,
	.remove = w90x900ts_remove,
	.driver = {
	.name = "nuc900-ts",
	},
	};
	module_platform_driver(w90x900ts_driver);

	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
	MODULE_DESCRIPTION("w90p910 touch screen driver!");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:nuc900-ts");