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Commit 22e39d34 authored by Mark Brown's avatar Mark Brown Committed by Dmitry Torokhov
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Input: add accelerated touchscreen support for Marvell Zylonite 



This patch implements accelerated touchscreen support for the Marvell
Zylonite development platform, supporting pen down interrupts and
continuous mode data transfers.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent cd2d64b1

drivers/input/touchscreen/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -308,6 +308,19 @@ config TOUCHSCREEN_WM97XX_MAINSTONE 
	  To compile this driver as a module, choose M here: the

	  module will be called mainstone-wm97xx.



config TOUCHSCREEN_WM97XX_ZYLONITE

	tristate "Zylonite accelerated touch"

	depends on TOUCHSCREEN_WM97XX && MACH_ZYLONITE

	select TOUCHSCREEN_WM9713

	help

	  Say Y here for support for streaming mode with the touchscreen

	  on Zylonite systems.



	  If unsure, say N.



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

	  module will be called zylonite-wm97xx.



config TOUCHSCREEN_USB_COMPOSITE

	tristate "USB Touchscreen Driver"

	depends on USB_ARCH_HAS_HCD

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,3 +34,4 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o 
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)	+= wm9712.o

wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713)	+= wm9713.o

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

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

drivers/input/touchscreen/zylonite-wm97xx.c

0 → 100644
+240 −0
Original line number Diff line number Diff line 
/*

 * zylonite-wm97xx.c  --  Zylonite Continuous Touch screen driver

 *

 * Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC.

 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

 * Parts Copyright : Ian Molton <spyro@f2s.com>

 *                   Andrew Zabolotny <zap@homelink.ru>

 *

 *  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, or (at your

 *  option) any later version.

 *

 * Notes:

 *     This is a wm97xx extended touch driver supporting interrupt driven

 *     and continuous operation on Marvell Zylonite development systems

 *     (which have a WM9713 on board).

 */



#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/wm97xx.h>



#include <mach/hardware.h>

#include <mach/mfp.h>

#include <mach/regs-ac97.h>



struct continuous {

	u16 id;    /* codec id */

	u8 code;   /* continuous code */

	u8 reads;  /* number of coord reads per read cycle */

	u32 speed; /* number of coords per second */

};



#define WM_READS(sp) ((sp / HZ) + 1)



static const struct continuous cinfo[] = {

	{ WM9713_ID2, 0, WM_READS(94),  94  },

	{ WM9713_ID2, 1, WM_READS(120), 120 },

	{ WM9713_ID2, 2, WM_READS(154), 154 },

	{ WM9713_ID2, 3, WM_READS(188), 188 },

};



/* continuous speed index */

static int sp_idx;



/*

 * Pen sampling frequency (Hz) in continuous mode.

 */

static int cont_rate = 200;

module_param(cont_rate, int, 0);

MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");



/*

 * Pressure readback.

 *

 * Set to 1 to read back pen down pressure

 */

static int pressure;

module_param(pressure, int, 0);

MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");



/*

 * AC97 touch data slot.

 *

 * Touch screen readback data ac97 slot

 */

static int ac97_touch_slot = 5;

module_param(ac97_touch_slot, int, 0);

MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");





/* flush AC97 slot 5 FIFO machines */

static void wm97xx_acc_pen_up(struct wm97xx *wm)

{

	int i;



	msleep(1);



	for (i = 0; i < 16; i++)

		MODR;

}



static int wm97xx_acc_pen_down(struct wm97xx *wm)

{

	u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;

	int reads = 0;

	static u16 last, tries;



	/* When the AC97 queue has been drained we need to allow time

	 * to buffer up samples otherwise we end up spinning polling

	 * for samples.  The controller can't have a suitably low

	 * threashold set to use the notifications it gives.

	 */

	msleep(1);



	if (tries > 5) {

		tries = 0;

		return RC_PENUP;

	}



	x = MODR;

	if (x == last) {

		tries++;

		return RC_AGAIN;

	}

	last = x;

	do {

		if (reads)

			x = MODR;

		y = MODR;

		if (pressure)

			p = MODR;



		/* are samples valid */

		if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X ||

		    (y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y ||

		    (p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)

			goto up;



		/* coordinate is good */

		tries = 0;

		input_report_abs(wm->input_dev, ABS_X, x & 0xfff);

		input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);

		input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);

		input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));

		input_sync(wm->input_dev);

		reads++;

	} while (reads < cinfo[sp_idx].reads);

up:

	return RC_PENDOWN | RC_AGAIN;

}



static int wm97xx_acc_startup(struct wm97xx *wm)

{

	int idx;



	/* check we have a codec */

	if (wm->ac97 == NULL)

		return -ENODEV;



	/* Go you big red fire engine */

	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {

		if (wm->id != cinfo[idx].id)

			continue;

		sp_idx = idx;

		if (cont_rate <= cinfo[idx].speed)

			break;

	}

	wm->acc_rate = cinfo[sp_idx].code;

	wm->acc_slot = ac97_touch_slot;

	dev_info(wm->dev,

		 "zylonite accelerated touchscreen driver, %d samples/sec\n",

		 cinfo[sp_idx].speed);



	return 0;

}



static void wm97xx_irq_enable(struct wm97xx *wm, int enable)

{

	if (enable)

		enable_irq(wm->pen_irq);

	else

		disable_irq_nosync(wm->pen_irq);

}



static struct wm97xx_mach_ops zylonite_mach_ops = {

	.acc_enabled	= 1,

	.acc_pen_up	= wm97xx_acc_pen_up,

	.acc_pen_down	= wm97xx_acc_pen_down,

	.acc_startup	= wm97xx_acc_startup,

	.irq_enable	= wm97xx_irq_enable,

	.irq_gpio	= WM97XX_GPIO_2,

};



static int zylonite_wm97xx_probe(struct platform_device *pdev)

{

	struct wm97xx *wm = platform_get_drvdata(pdev);

	int gpio_touch_irq;



	if (cpu_is_pxa320())

		gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15);

	else

		gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26);



	wm->pen_irq = IRQ_GPIO(gpio_touch_irq);

	set_irq_type(IRQ_GPIO(gpio_touch_irq), IRQ_TYPE_EDGE_BOTH);



	wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,

			   WM97XX_GPIO_POL_HIGH,

			   WM97XX_GPIO_STICKY,

			   WM97XX_GPIO_WAKE);

	wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,

			   WM97XX_GPIO_POL_HIGH,

			   WM97XX_GPIO_NOTSTICKY,

			   WM97XX_GPIO_NOWAKE);



	return wm97xx_register_mach_ops(wm, &zylonite_mach_ops);

}



static int zylonite_wm97xx_remove(struct platform_device *pdev)

{

	struct wm97xx *wm = platform_get_drvdata(pdev);



	wm97xx_unregister_mach_ops(wm);



	return 0;

}



static struct platform_driver zylonite_wm97xx_driver = {

	.probe	= zylonite_wm97xx_probe,

	.remove	= zylonite_wm97xx_remove,

	.driver	= {

		.name	= "wm97xx-touch",

	},

};



static int __init zylonite_wm97xx_init(void)

{

	return platform_driver_register(&zylonite_wm97xx_driver);

}



static void __exit zylonite_wm97xx_exit(void)

{

	platform_driver_unregister(&zylonite_wm97xx_driver);

}



module_init(zylonite_wm97xx_init);

module_exit(zylonite_wm97xx_exit);



/* Module information */

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");

MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite");

MODULE_LICENSE("GPL");