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Commit 7e3f7375 authored by Wan ZongShun's avatar Wan ZongShun Committed by Dmitry Torokhov
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Input: add support for touchscreen on W90P910 ARM platform 



The touchscreen works in two modes, wait trigger mode and auto-semi
mode. The device starts in wait trigger mode and waits until pressure
is detected, then device sets WT_INT bit and raises an interrupt.
The driver should put the device into auto-semi mode and prepare for
reading first X and then Y coordinates. When coordinate data is ready
the driver sets ADC_INT bit and raises interrupt again.

[dtor@mail.ru: various cleanups]
Signed-off-by: default avatarWan ZongShun <mcuos.com@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 4894e4ac

drivers/input/touchscreen/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -490,4 +490,12 @@ config TOUCHSCREEN_TSC2007 
	  To compile this driver as a module, choose M here: the

	  module will be called tsc2007.



config TOUCHSCREEN_W90X900

	tristate "W90P910 touchscreen driver"

	help

	  Say Y here if you have a W90P910 based touchscreen.



	  To compile this driver as a module, choose M here: the

	  module will be called w90p910_ts.



endif

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -39,3 +39,4 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o 
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL)	+= atmel-wm97xx.o

obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o

obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o

obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o

drivers/input/touchscreen/w90p910_ts.c

0 → 100644
+350 −0
Original line number Diff line number Diff line 
/*

 * 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/input.h>

#include <linux/interrupt.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;

	int irq_num;

	void __iomem *clocken;

	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 */

	val = __raw_readl(w90p910_ts->clocken);

	__raw_writel(val | ADC_CLK_EN, w90p910_ts->clocken);



	__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 */

	val = __raw_readl(w90p910_ts->clocken);

	__raw_writel(val & ~ADC_CLK_EN, w90p910_ts->clocken);

}



static int __devinit 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, res->end - res->start + 1,

				pdev->name)) {

		err = -EBUSY;

		goto fail1;

	}



	w90p910_ts->ts_reg = ioremap(res->start, res->end - res->start + 1);

	if (!w90p910_ts->ts_reg) {

		err = -ENOMEM;

		goto fail2;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!res) {

		err = -ENXIO;

		goto fail3;

	}



	w90p910_ts->clocken = (void __iomem *)res->start;



	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,

			IRQF_DISABLED, "w90p910ts", w90p910_ts)) {

		err = -EBUSY;

		goto fail3;

	}



	err = input_register_device(w90p910_ts->input);

	if (err)

		goto fail4;



	platform_set_drvdata(pdev, w90p910_ts);



	return 0;



fail4:	free_irq(w90p910_ts->irq_num, w90p910_ts);

fail3:	iounmap(w90p910_ts->ts_reg);

fail2:	release_mem_region(res->start, res->end - res->start + 1);

fail1:	input_free_device(input_dev);

	kfree(w90p910_ts);

	return err;

}



static int __devexit 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);



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	release_mem_region(res->start, res->end - res->start + 1);



	input_unregister_device(w90p910_ts->input);

	kfree(w90p910_ts);



	platform_set_drvdata(pdev, NULL);



	return 0;

}



static struct platform_driver w90x900ts_driver = {

	.probe		= w90x900ts_probe,

	.remove		= __devexit_p(w90x900ts_remove),

	.driver		= {

		.name	= "w90x900-ts",

		.owner	= THIS_MODULE,

	},

};



static int __init w90x900ts_init(void)

{

	return platform_driver_register(&w90x900ts_driver);

}



static void __exit w90x900ts_exit(void)

{

	platform_driver_unregister(&w90x900ts_driver);

}



module_init(w90x900ts_init);

module_exit(w90x900ts_exit);



MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");

MODULE_DESCRIPTION("w90p910 touch screen driver!");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:w90p910-ts");