path: root/meta/packages/linux/linux-rp-2.6.23/wm97xx-lg13-r0.patch

Index: linux-2.6.17/drivers/input/touchscreen/Kconfig
===================================================================
--- linux-2.6.17.orig/drivers/input/touchscreen/Kconfig	2006-09-19 20:35:35.060495500 +0200
+++ linux-2.6.17/drivers/input/touchscreen/Kconfig	2006-09-19 20:36:47.965051750 +0200
@@ -121,4 +121,57 @@ config TOUCHSCREEN_TSC2101
 	  To compile this driver as a module, choose M here: the
 	  module will be called ads7846_ts.
 
+config TOUCHSCREEN_WM97XX
+	tristate "Support for WM97xx AC97 touchscreen controllers"
+	depends SND_AC97_BUS
+
+choice
+	prompt "WM97xx codec type"
+
+config TOUCHSCREEN_WM9705
+	bool "WM9705 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have the wm9705 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called wm9705.
+
+config TOUCHSCREEN_WM9712
+	bool "WM9712 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have the wm9712 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called wm9712.
+
+config TOUCHSCREEN_WM9713
+	bool "WM9713 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have the wm9713 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called wm9713.
+
+endchoice
+
+config TOUCHSCREEN_WM97XX_PXA
+	tristate "WM97xx PXA accelerated touch"
+	depends on TOUCHSCREEN_WM97XX && ARCH_PXA
+	help
+	  Say Y here for continuous mode touch on the PXA
+
+	  If unsure, say N
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pxa-wm97xx
+
 endif
Index: linux-2.6.17/drivers/input/touchscreen/Makefile
===================================================================
--- linux-2.6.17.orig/drivers/input/touchscreen/Makefile	2006-09-19 20:35:35.072496250 +0200
+++ linux-2.6.17/drivers/input/touchscreen/Makefile	2006-09-19 20:37:40.540337500 +0200
@@ -4,6 +4,8 @@
 
 # Each configuration option enables a list of files.
 
+wm97xx-ts-objs := wm97xx-core.o
+
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)	+= h3600_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_CORGI)	+= corgi_ts.o
@@ -13,3 +15,16 @@ obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtou
 obj-$(CONFIG_TOUCHSCREEN_MK712)	+= mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600)	+= hp680_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_TSC2101)	+= tsc2101_ts.o
+obj-$(CONFIG_TOUCHSCREEN_WM97XX)    	+= wm97xx-ts.o
+obj-$(CONFIG_TOUCHSCREEN_WM97XX_PXA)    += pxa-wm97xx.o
+
+ifeq ($(CONFIG_TOUCHSCREEN_WM9713),y)
+wm97xx-ts-objs += wm9713.o
+endif
+
+ifeq ($(CONFIG_TOUCHSCREEN_WM9712),y)
+wm97xx-ts-objs += wm9712.o
+endif
+ifeq ($(CONFIG_TOUCHSCREEN_WM9705),y)
+wm97xx-ts-objs += wm9705.o
+endif
Index: linux-2.6.17/drivers/input/touchscreen/pxa-wm97xx.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/drivers/input/touchscreen/pxa-wm97xx.c	2006-09-19 20:36:47.965051750 +0200
@@ -0,0 +1,289 @@
+/*
+ * pxa-wm97xx.c  --  pxa-wm97xx Continuous Touch screen driver for
+ *                   Wolfson WM97xx AC97 Codecs.
+ *
+ * Copyright 2004 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         liam.girdwood@wolfsonmicro.com or linux@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 to capture touch
+ *     data in a continuous manner on the Intel XScale archictecture
+ *
+ *  Features:
+ *       - codecs supported:- WM9705, WM9712, WM9713
+ *       - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
+ *
+ *  Revision history
+ *    18th Aug 2004   Initial version.
+ *    26th Jul 2005   Improved continous read back and added FIFO flushing.
+ *    06th Sep 2005   Mike Arthur <linux@wolfsonmicro.com>
+ *                    Moved to using the wm97xx bus
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/wm97xx.h>
+#include <asm/io.h>
+#include <asm/arch/pxa-regs.h>
+
+#define VERSION		"0.13"
+
+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[] = {
+	{WM9705_ID2, 0, WM_READS(94), 94},
+	{WM9705_ID2, 1, WM_READS(188), 188},
+	{WM9705_ID2, 2, WM_READS(375), 375},
+	{WM9705_ID2, 3, WM_READS(750), 750},
+	{WM9712_ID2, 0, WM_READS(94), 94},
+	{WM9712_ID2, 1, WM_READS(188), 188},
+	{WM9712_ID2, 2, WM_READS(375), 375},
+	{WM9712_ID2, 3, WM_READS(750), 750},
+	{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 = 0;
+static u16 last = 0, tries = 0;
+
+/*
+ * 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)");
+
+/*
+ * Pen down detection.
+ *
+ * This driver can either poll or use an interrupt to indicate a pen down
+ * event. If the irq request fails then it will fall back to polling mode.
+ */
+static int pen_int = 1;
+module_param(pen_int, int, 0);
+MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
+
+/*
+ * Pressure readback.
+ *
+ * Set to 1 to read back pen down pressure
+ */
+static int pressure = 0;
+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 on pxa machines */
+#ifdef CONFIG_PXA27x
+void wm97xx_acc_pen_up (struct wm97xx* wm)
+{
+	set_current_state(TASK_INTERRUPTIBLE);
+	schedule_timeout(1);
+
+	while (MISR & (1 << 2))
+		MODR;
+}
+#else
+void wm97xx_acc_pen_up (struct wm97xx* wm)
+{
+	int count = 16;
+	set_current_state(TASK_INTERRUPTIBLE);
+	schedule_timeout(1);
+
+	while (count < 16) {
+		MODR;
+		count--;
+	}
+}
+#endif
+
+int wm97xx_acc_pen_down (struct wm97xx* wm)
+{
+	u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
+	int reads = 0;
+
+	/* data is never immediately available after pen down irq */
+	set_current_state(TASK_INTERRUPTIBLE);
+	schedule_timeout(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 & 0x7000) != WM97XX_ADCSEL_X ||
+			(y & 0x7000) != WM97XX_ADCSEL_Y ||
+			(p & 0x7000) != WM97XX_ADCSEL_PRES)
+			goto up;
+
+		/* coordinate is good */
+		tries = 0;
+		//printk("x %x y %x p %x\n", x,y,p);
+		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_sync (wm->input_dev);
+		reads++;
+	} while (reads < cinfo[sp_idx].reads);
+up:
+	return RC_PENDOWN | RC_AGAIN;
+}
+
+int wm97xx_acc_startup(struct wm97xx* wm)
+{
+	int idx = 0;
+
+	/* 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;
+	printk(KERN_INFO "pxa2xx accelerated touchscreen driver, %d samples (sec)\n",
+		cinfo[sp_idx].speed);
+
+	/* codec specific irq config */
+	if (pen_int) {
+		switch (wm->id) {
+			case WM9705_ID2:
+				wm->pen_irq = IRQ_GPIO(4);
+				set_irq_type(IRQ_GPIO(4), IRQT_BOTHEDGE);
+				break;
+			case WM9712_ID2:
+			case WM9713_ID2:
+				/* enable pen down interrupt */
+				/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
+				wm->pen_irq = MAINSTONE_AC97_IRQ;
+				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);
+				break;
+			default:
+				printk(KERN_WARNING "pen down irq not supported on this device\n");
+				pen_int = 0;
+				break;
+		}
+	}
+
+	return 0;
+}
+
+void wm97xx_acc_shutdown(struct wm97xx* wm)
+{
+    /* codec specific deconfig */
+	if (pen_int) {
+		switch (wm->id & 0xffff) {
+			case WM9705_ID2:
+				wm->pen_irq = 0;
+				break;
+			case WM9712_ID2:
+			case WM9713_ID2:
+				/* disable interrupt */
+				wm->pen_irq = 0;
+				break;
+		}
+	}
+}
+
+static struct wm97xx_mach_ops pxa_mach_ops = {
+	.acc_enabled = 1,
+	.acc_pen_up = wm97xx_acc_pen_up,
+    .acc_pen_down = wm97xx_acc_pen_down,
+    .acc_startup = wm97xx_acc_startup,
+    .acc_shutdown = wm97xx_acc_shutdown,
+};
+
+int pxa_wm97xx_probe(struct device *dev)
+{
+    struct wm97xx *wm = dev->driver_data;
+    return wm97xx_register_mach_ops (wm, &pxa_mach_ops);
+}
+
+int pxa_wm97xx_remove(struct device *dev)
+{
+	struct wm97xx *wm = dev->driver_data;
+    wm97xx_unregister_mach_ops (wm);
+    return 0;
+}
+
+static struct device_driver  pxa_wm97xx_driver = {
+    .name = "wm97xx-touchscreen",
+    .bus = &wm97xx_bus_type,
+    .owner = THIS_MODULE,
+    .probe = pxa_wm97xx_probe,
+    .remove = pxa_wm97xx_remove
+};
+
+static int __init pxa_wm97xx_init(void)
+{
+    return driver_register(&pxa_wm97xx_driver);
+}
+
+static void __exit pxa_wm97xx_exit(void)
+{
+    driver_unregister(&pxa_wm97xx_driver);
+}
+
+module_init(pxa_wm97xx_init);
+module_exit(pxa_wm97xx_exit);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
+MODULE_DESCRIPTION("wm97xx continuous touch driver for pxa2xx");
+MODULE_LICENSE("GPL");
Index: linux-2.6.17/drivers/input/touchscreen/wm9705.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/drivers/input/touchscreen/wm9705.c	2006-09-19 20:36:47.969052000 +0200
@@ -0,0 +1,360 @@
+/*
+ * wm9705.c  --  Codec driver for Wolfson WM9705 AC97 Codec.
+ *
+ * Copyright 2003, 2004, 2005, 2006 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
+ * Parts Copyright : Ian Molton <spyro@f2s.com>
+ *                   Andrew Zabolotny <zap@homelink.ru>
+ *                   Russell King <rmk@arm.linux.org.uk>
+ *
+ *  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.
+ *
+ *  Revision history
+ *     6th Sep 2006  Mike Arthur <linux@wolfsonmicro.com>
+ *                   Added pre and post sample calls.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/wm97xx.h>
+
+#define TS_NAME			"wm97xx"
+#define WM9705_VERSION		"0.62"
+#define DEFAULT_PRESSURE	0xb0c0
+
+/*
+ * Debug
+ */
+#if 0
+#define dbg(format, arg...) printk(KERN_DEBUG TS_NAME ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...)
+#endif
+#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
+
+/*
+ * Module parameters
+ */
+
+/*
+ * Set current used for pressure measurement.
+ *
+ * Set pil = 2 to use 400uA
+ *     pil = 1 to use 200uA and
+ *     pil = 0 to disable pressure measurement.
+ *
+ * This is used to increase the range of values returned by the adc
+ * when measureing touchpanel pressure.
+ */
+static int pil = 0;
+module_param(pil, int, 0);
+MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
+
+/*
+ * Set threshold for pressure measurement.
+ *
+ * Pen down pressure below threshold is ignored.
+ */
+static int pressure = DEFAULT_PRESSURE & 0xfff;
+module_param(pressure, int, 0);
+MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
+
+/*
+ * Set adc sample delay.
+ *
+ * For accurate touchpanel measurements, some settling time may be
+ * required between the switch matrix applying a voltage across the
+ * touchpanel plate and the ADC sampling the signal.
+ *
+ * This delay can be set by setting delay = n, where n is the array
+ * position of the delay in the array delay_table below.
+ * Long delays > 1ms are supported for completeness, but are not
+ * recommended.
+ */
+static int delay = 4;
+module_param(delay, int, 0);
+MODULE_PARM_DESC(delay, "Set adc sample delay.");
+
+/*
+ * Pen detect comparator threshold.
+ *
+ * 0 to Vmid in 15 steps, 0 = use zero power comparator with Vmid threshold
+ * i.e. 1 =  Vmid/15 threshold
+ *      15 =  Vmid/1 threshold
+ *
+ * Adjust this value if you are having problems with pen detect not
+ * detecting any down events.
+ */
+static int pdd = 8;
+module_param(pdd, int, 0);
+MODULE_PARM_DESC(pdd, "Set pen detect comparator threshold");
+
+/*
+ * Set adc mask function.
+ *
+ * Sources of glitch noise, such as signals driving an LCD display, may feed
+ * through to the touch screen plates and affect measurement accuracy. In
+ * order to minimise this, a signal may be applied to the MASK pin to delay or
+ * synchronise the sampling.
+ *
+ * 0 = No delay or sync
+ * 1 = High on pin stops conversions
+ * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
+ * 3 = Edge triggered, edge on pin starts conversion after delay param
+ */
+static int mask = 0;
+module_param(mask, int, 0);
+MODULE_PARM_DESC(mask, "Set adc mask function.");
+
+/*
+ * ADC sample delay times in uS
+ */
+static const int delay_table[] = {
+	21,    // 1 AC97 Link frames
+	42,    // 2
+	84,    // 4
+	167,   // 8
+	333,   // 16
+	667,   // 32
+	1000,  // 48
+	1333,  // 64
+	2000,  // 96
+	2667,  // 128
+	3333,  // 160
+	4000,  // 192
+	4667,  // 224
+	5333,  // 256
+	6000,  // 288
+	0      // No delay, switch matrix always on
+};
+
+/*
+ * Delay after issuing a POLL command.
+ *
+ * The delay is 3 AC97 link frames + the touchpanel settling delay
+ */
+static inline void poll_delay(int d)
+{
+	udelay (3 * AC97_LINK_FRAME + delay_table [d]);
+}
+
+/*
+ * set up the physical settings of the WM9705
+ */
+static void init_wm9705_phy(struct wm97xx* wm)
+{
+	u16 dig1 = 0, dig2 = WM97XX_RPR;
+
+	/*
+	* mute VIDEO and AUX as they share X and Y touchscreen
+	* inputs on the WM9705
+	*/
+	wm97xx_reg_write(wm, AC97_AUX, 0x8000);
+	wm97xx_reg_write(wm, AC97_VIDEO, 0x8000);
+
+	/* touchpanel pressure current*/
+	if  (pil == 2) {
+		dig2 |= WM9705_PIL;
+		dbg("setting pressure measurement current to 400uA.");
+	} else if (pil)
+		dbg("setting pressure measurement current to 200uA.");
+	if(!pil)
+		pressure = 0;
+
+	/* polling mode sample settling delay */
+	if (delay!=4) {
+		if (delay < 0 || delay > 15) {
+		    dbg("supplied delay out of range.");
+		    delay = 4;
+		}
+	}
+	dig1 &= 0xff0f;
+	dig1 |= WM97XX_DELAY(delay);
+	dbg("setting adc sample delay to %d u Secs.", delay_table[delay]);
+
+	/* WM9705 pdd */
+	dig2 |= (pdd & 0x000f);
+	dbg("setting pdd to Vmid/%d", 1 - (pdd & 0x000f));
+
+	/* mask */
+	dig2 |= ((mask & 0x3) << 4);
+
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
+}
+
+static int wm9705_digitiser_ioctl(struct wm97xx* wm, int cmd)
+{
+	switch(cmd) {
+	case WM97XX_DIG_START:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig[2] | WM97XX_PRP_DET_DIG);
+		wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
+		break;
+	case WM97XX_DIG_STOP:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig[2] & ~WM97XX_PRP_DET_DIG);
+		break;
+	case WM97XX_AUX_PREPARE:
+		memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
+		break;
+	case WM97XX_DIG_RESTORE:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
+		break;
+	case WM97XX_PHY_INIT:
+		init_wm9705_phy(wm);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static inline int is_pden (struct wm97xx* wm)
+{
+	return wm->dig[2] & WM9705_PDEN;
+}
+
+/*
+ * Read a sample from the WM9705 adc in polling mode.
+ */
+static int wm9705_poll_sample (struct wm97xx* wm, int adcsel, int *sample)
+{
+	int timeout = 5 * delay;
+
+	if (!wm->pen_probably_down) {
+		u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(data & WM97XX_PEN_DOWN))
+			return RC_PENUP;
+		wm->pen_probably_down = 1;
+	}
+
+	/* set up digitiser */
+	if (adcsel & 0x8000)
+		adcsel = ((adcsel & 0x7fff) + 3) << 12;
+
+	if (wm->mach_ops && wm->mach_ops->pre_sample)
+		wm->mach_ops->pre_sample(adcsel);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, adcsel | WM97XX_POLL | WM97XX_DELAY(delay));
+
+	/* wait 3 AC97 time slots + delay for conversion */
+	poll_delay (delay);
+
+	/* wait for POLL to go low */
+	while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL) && timeout) {
+		udelay(AC97_LINK_FRAME);
+		timeout--;
+	}
+
+	if (timeout <= 0) {
+		/* If PDEN is set, we can get a timeout when pen goes up */
+		if (is_pden(wm))
+			wm->pen_probably_down = 0;
+		else
+			dbg ("adc sample timeout");
+		return RC_PENUP;
+	}
+
+	*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	if (wm->mach_ops && wm->mach_ops->post_sample)
+		wm->mach_ops->post_sample(adcsel);
+
+	/* check we have correct sample */
+	if ((*sample & WM97XX_ADCSEL_MASK) != adcsel) {
+		dbg ("adc wrong sample, read %x got %x", adcsel,
+		*sample & WM97XX_ADCSEL_MASK);
+		return RC_PENUP;
+	}
+
+	if (!(*sample & WM97XX_PEN_DOWN)) {
+		wm->pen_probably_down = 0;
+		return RC_PENUP;
+	}
+
+	return RC_VALID;
+}
+
+/*
+ * Sample the WM9705 touchscreen in polling mode
+ */
+static int wm9705_poll_touch(struct wm97xx* wm, struct wm97xx_data *data)
+{
+	int rc;
+
+	if ((rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_X, &data->x)) != RC_VALID)
+		return rc;
+	if ((rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y)) != RC_VALID)
+		return rc;
+	if (pil) {
+		if ((rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_PRES, &data->p)) != RC_VALID)
+			return rc;
+	} else
+		data->p = DEFAULT_PRESSURE;
+
+	return RC_VALID;
+}
+
+/*
+ * Enable WM9705 continuous mode, i.e. touch data is streamed across an AC97 slot
+ */
+static int wm9705_acc_enable (struct wm97xx* wm, int enable)
+{
+	u16 dig1, dig2;
+	int ret = 0;
+
+	dig1 = wm->dig[1];
+	dig2 = wm->dig[2];
+
+	if (enable) {
+		/* continous mode */
+		if (wm->mach_ops->acc_startup && (ret = wm->mach_ops->acc_startup(wm)) < 0)
+			return ret;
+		dig1 &= ~(WM97XX_CM_RATE_MASK | WM97XX_ADCSEL_MASK |
+			WM97XX_DELAY_MASK | WM97XX_SLT_MASK);
+		dig1 |= WM97XX_CTC | WM97XX_COO | WM97XX_SLEN |
+			WM97XX_DELAY (delay) |
+			WM97XX_SLT (wm->acc_slot) |
+			WM97XX_RATE (wm->acc_rate);
+		if (pil)
+			dig1 |= WM97XX_ADCSEL_PRES;
+		dig2 |= WM9705_PDEN;
+	} else {
+		dig1 &= ~(WM97XX_CTC | WM97XX_COO | WM97XX_SLEN);
+		dig2 &= ~WM9705_PDEN;
+		if (wm->mach_ops->acc_shutdown)
+			wm->mach_ops->acc_shutdown(wm);
+	}
+
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
+	return ret;
+}
+
+struct wm97xx_codec_drv wm97xx_codec = {
+	.id = 	WM9705_ID2,
+	.name = "wm9705",
+	.poll_sample = wm9705_poll_sample,
+	.poll_touch = wm9705_poll_touch,
+	.acc_enable = wm9705_acc_enable,
+	.digitiser_ioctl = wm9705_digitiser_ioctl,
+};
+
+EXPORT_SYMBOL_GPL(wm97xx_codec);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("WM9705 Touch Screen Driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.17/drivers/input/touchscreen/wm9712.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/drivers/input/touchscreen/wm9712.c	2006-09-19 20:36:47.969052000 +0200
@@ -0,0 +1,464 @@
+/*
+ * wm9712.c  --  Codec driver for Wolfson WM9712 AC97 Codecs.
+ *
+ * Copyright 2003, 2004, 2005, 2006 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
+ * Parts Copyright : Ian Molton <spyro@f2s.com>
+ *                   Andrew Zabolotny <zap@homelink.ru>
+ *                   Russell King <rmk@arm.linux.org.uk>
+ *
+ *  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.
+ *
+ *  Revision history
+ *     4th Jul 2005  Initial version.
+ *     6th Sep 2006  Mike Arthur <linux@wolfsonmicro.com>
+ *                   Added pre and post sample calls.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/wm97xx.h>
+
+#define TS_NAME			"wm97xx"
+#define WM9712_VERSION		"0.61"
+#define DEFAULT_PRESSURE	0xb0c0
+
+/*
+ * Debug
+ */
+#if 0
+#define dbg(format, arg...) printk(KERN_DEBUG TS_NAME ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...)
+#endif
+#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
+
+/*
+ * Module parameters
+ */
+
+/*
+ * Set internal pull up for pen detect.
+ *
+ * Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
+ * i.e. pull up resistance = 64k Ohms / rpu.
+ *
+ * Adjust this value if you are having problems with pen detect not
+ * detecting any down event.
+ */
+static int rpu = 3;
+module_param(rpu, int, 0);
+MODULE_PARM_DESC(rpu, "Set internal pull up resitor for pen detect.");
+
+/*
+ * Set current used for pressure measurement.
+ *
+ * Set pil = 2 to use 400uA
+ *     pil = 1 to use 200uA and
+ *     pil = 0 to disable pressure measurement.
+ *
+ * This is used to increase the range of values returned by the adc
+ * when measureing touchpanel pressure.
+ */
+static int pil = 0;
+module_param(pil, int, 0);
+MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
+
+/*
+ * Set threshold for pressure measurement.
+ *
+ * Pen down pressure below threshold is ignored.
+ */
+static int pressure = DEFAULT_PRESSURE & 0xfff;
+module_param(pressure, int, 0);
+MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
+
+/*
+ * Set adc sample delay.
+ *
+ * For accurate touchpanel measurements, some settling time may be
+ * required between the switch matrix applying a voltage across the
+ * touchpanel plate and the ADC sampling the signal.
+ *
+ * This delay can be set by setting delay = n, where n is the array
+ * position of the delay in the array delay_table below.
+ * Long delays > 1ms are supported for completeness, but are not
+ * recommended.
+ */
+static int delay = 3;
+module_param(delay, int, 0);
+MODULE_PARM_DESC(delay, "Set adc sample delay.");
+
+/*
+ * Set five_wire = 1 to use a 5 wire touchscreen.
+ *
+ * NOTE: Five wire mode does not allow for readback of pressure.
+ */
+static int five_wire;
+module_param(five_wire, int, 0);
+MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
+
+/*
+ * Set adc mask function.
+ *
+ * Sources of glitch noise, such as signals driving an LCD display, may feed
+ * through to the touch screen plates and affect measurement accuracy. In
+ * order to minimise this, a signal may be applied to the MASK pin to delay or
+ * synchronise the sampling.
+ *
+ * 0 = No delay or sync
+ * 1 = High on pin stops conversions
+ * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
+ * 3 = Edge triggered, edge on pin starts conversion after delay param
+ */
+static int mask = 0;
+module_param(mask, int, 0);
+MODULE_PARM_DESC(mask, "Set adc mask function.");
+
+/*
+ * Coordinate Polling Enable.
+ *
+ * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
+ * for every poll.
+ */
+static int coord = 0;
+module_param(coord, int, 0);
+MODULE_PARM_DESC(coord, "Polling coordinate mode");
+
+/*
+ * ADC sample delay times in uS
+ */
+static const int delay_table[] = {
+	21,    // 1 AC97 Link frames
+	42,    // 2
+	84,    // 4
+	167,   // 8
+	333,   // 16
+	667,   // 32
+	1000,  // 48
+	1333,  // 64
+	2000,  // 96
+	2667,  // 128
+	3333,  // 160
+	4000,  // 192
+	4667,  // 224
+	5333,  // 256
+	6000,  // 288
+	0      // No delay, switch matrix always on
+};
+
+/*
+ * Delay after issuing a POLL command.
+ *
+ * The delay is 3 AC97 link frames + the touchpanel settling delay
+ */
+static inline void poll_delay(int d)
+{
+	udelay (3 * AC97_LINK_FRAME + delay_table [d]);
+}
+
+/*
+ * set up the physical settings of the WM9712
+ */
+static void init_wm9712_phy(struct wm97xx* wm)
+{
+	u16 dig1 = 0;
+	u16 dig2 = WM97XX_RPR | WM9712_RPU(1);
+
+	/* WM9712 rpu */
+	if (rpu) {
+		dig2 &= 0xffc0;
+		dig2 |= WM9712_RPU(rpu);
+		dbg("setting pen detect pull-up to %d Ohms",64000 / rpu);
+	}
+
+	/* touchpanel pressure current*/
+	if (pil == 2) {
+		dig2 |= WM9712_PIL;
+		dbg("setting pressure measurement current to 400uA.");
+	} else if (pil)
+		dbg("setting pressure measurement current to 200uA.");
+	if(!pil)
+		pressure = 0;
+
+	/* WM9712 five wire */
+	if (five_wire) {
+		dig2 |= WM9712_45W;
+		dbg("setting 5-wire touchscreen mode.");
+	}
+
+	/* polling mode sample settling delay */
+	if (delay < 0 || delay > 15) {
+		dbg("supplied delay out of range.");
+		delay = 4;
+	}
+	dig1 &= 0xff0f;
+	dig1 |= WM97XX_DELAY(delay);
+	dbg("setting adc sample delay to %d u Secs.", delay_table[delay]);
+
+	/* mask */
+	dig2 |= ((mask & 0x3) << 6);
+	if (mask) {
+		u16 reg;
+		/* Set GPIO4 as Mask Pin*/
+		reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
+		wm97xx_reg_write(wm, AC97_MISC_AFE, reg | WM97XX_GPIO_4);
+		reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
+		wm97xx_reg_write(wm, AC97_GPIO_CFG, reg | WM97XX_GPIO_4);
+	}
+
+	/* wait - coord mode */
+	if(coord)
+		dig2 |= WM9712_WAIT;
+
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
+}
+
+static int wm9712_digitiser_ioctl(struct wm97xx* wm, int cmd)
+{
+	u16 dig2 = wm->dig[2];
+
+	switch(cmd) {
+	case WM97XX_DIG_START:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2 | WM97XX_PRP_DET_DIG);
+		wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
+		break;
+	case WM97XX_DIG_STOP:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2 & ~WM97XX_PRP_DET_DIG);
+		break;
+	case WM97XX_AUX_PREPARE:
+		memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
+		break;
+	case WM97XX_DIG_RESTORE:
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
+		break;
+	case WM97XX_PHY_INIT:
+		init_wm9712_phy(wm);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static inline int is_pden (struct wm97xx* wm)
+{
+	return wm->dig[2] & WM9712_PDEN;
+}
+
+/*
+ * Read a sample from the WM9712 adc in polling mode.
+ */
+static int wm9712_poll_sample (struct wm97xx* wm, int adcsel, int *sample)
+{
+	int timeout = 5 * delay;
+
+	if (!wm->pen_probably_down) {
+		u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(data & WM97XX_PEN_DOWN))
+			return RC_PENUP;
+		wm->pen_probably_down = 1;
+	}
+
+	/* set up digitiser */
+	if (adcsel & 0x8000)
+		adcsel = ((adcsel & 0x7fff) + 3) << 12;
+
+	if (wm->mach_ops && wm->mach_ops->pre_sample)
+		wm->mach_ops->pre_sample(adcsel);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, adcsel | WM97XX_POLL | WM97XX_DELAY(delay));
+
+	/* wait 3 AC97 time slots + delay for conversion */
+	poll_delay (delay);
+
+	/* wait for POLL to go low */
+	while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL) && timeout) {
+		udelay(AC97_LINK_FRAME);
+		timeout--;
+	}
+
+	if (timeout <= 0) {
+		/* If PDEN is set, we can get a timeout when pen goes up */
+		if (is_pden(wm))
+			wm->pen_probably_down = 0;
+		else
+			dbg ("adc sample timeout");
+		return RC_PENUP;
+	}
+
+	*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	if (wm->mach_ops && wm->mach_ops->post_sample)
+		wm->mach_ops->post_sample(adcsel);
+
+	/* check we have correct sample */
+	if ((*sample & WM97XX_ADCSEL_MASK) != adcsel) {
+		dbg ("adc wrong sample, read %x got %x", adcsel,
+		*sample & WM97XX_ADCSEL_MASK);
+		return RC_PENUP;
+	}
+
+	if (!(*sample & WM97XX_PEN_DOWN)) {
+		wm->pen_probably_down = 0;
+		return RC_PENUP;
+	}
+
+	return RC_VALID;
+}
+
+/*
+ * Read a coord from the WM9712 adc in polling mode.
+ */
+static int wm9712_poll_coord (struct wm97xx* wm, struct wm97xx_data *data)
+{
+	int timeout = 5 * delay;
+
+	if (!wm->pen_probably_down) {
+		u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(data & WM97XX_PEN_DOWN))
+			return RC_PENUP;
+		wm->pen_probably_down = 1;
+	}
+
+	/* set up digitiser */
+	if (wm->mach_ops && wm->mach_ops->pre_sample)
+		wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1,
+		WM97XX_COO | WM97XX_POLL | WM97XX_DELAY(delay));
+
+	/* wait 3 AC97 time slots + delay for conversion and read x */
+	poll_delay(delay);
+	data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	/* wait for POLL to go low */
+	while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL) && timeout) {
+		udelay(AC97_LINK_FRAME);
+		timeout--;
+	}
+
+	if (timeout <= 0) {
+		/* If PDEN is set, we can get a timeout when pen goes up */
+		if (is_pden(wm))
+			wm->pen_probably_down = 0;
+		else
+			dbg ("adc sample timeout");
+		return RC_PENUP;
+	}
+
+	/* read back y data */
+	data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	if (pil)
+		data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	else
+		data->p = DEFAULT_PRESSURE;
+
+	if (wm->mach_ops && wm->mach_ops->post_sample)
+		wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+
+	/* check we have correct sample */
+	if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
+		goto err;
+	if(pil && !(data->p & WM97XX_ADCSEL_PRES))
+		goto err;
+
+	if (!(data->x & WM97XX_PEN_DOWN)) {
+		wm->pen_probably_down = 0;
+		return RC_PENUP;
+	}
+	return RC_VALID;
+err:
+	return RC_PENUP;
+}
+
+/*
+ * Sample the WM9712 touchscreen in polling mode
+ */
+static int wm9712_poll_touch(struct wm97xx* wm, struct wm97xx_data *data)
+{
+	int rc;
+
+	if(coord) {
+		if((rc = wm9712_poll_coord(wm, data)) != RC_VALID)
+			return rc;
+	} else {
+		if ((rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X, &data->x)) != RC_VALID)
+			return rc;
+
+		if ((rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y)) != RC_VALID)
+			return rc;
+
+		if (pil && !five_wire) {
+			if ((rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES, &data->p)) != RC_VALID)
+				return rc;
+		} else
+			data->p = DEFAULT_PRESSURE;
+	}
+	return RC_VALID;
+}
+
+/*
+ * Enable WM9712 continuous mode, i.e. touch data is streamed across an AC97 slot
+ */
+static int wm9712_acc_enable (struct wm97xx* wm, int enable)
+{
+	u16 dig1, dig2;
+	int ret = 0;
+
+	dig1 = wm->dig[1];
+	dig2 = wm->dig[2];
+
+	if (enable) {
+		/* continous mode */
+		if (wm->mach_ops->acc_startup && (ret = wm->mach_ops->acc_startup(wm)) < 0)
+			return ret;
+		dig1 &= ~(WM97XX_CM_RATE_MASK | WM97XX_ADCSEL_MASK |
+			WM97XX_DELAY_MASK | WM97XX_SLT_MASK);
+		dig1 |= WM97XX_CTC | WM97XX_COO | WM97XX_SLEN |
+			WM97XX_DELAY (delay) |
+			WM97XX_SLT (wm->acc_slot) |
+			WM97XX_RATE (wm->acc_rate);
+		if (pil)
+			dig1 |= WM97XX_ADCSEL_PRES;
+		dig2 |= WM9712_PDEN;
+	} else {
+		dig1 &= ~(WM97XX_CTC | WM97XX_COO | WM97XX_SLEN);
+		dig2 &= ~WM9712_PDEN;
+		if (wm->mach_ops->acc_shutdown)
+			wm->mach_ops->acc_shutdown(wm);
+	}
+
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
+	return 0;
+}
+
+struct wm97xx_codec_drv wm97xx_codec = {
+	.id = 	WM9712_ID2,
+	.name = "wm9712",
+	.poll_sample = wm9712_poll_sample,
+	.poll_touch = wm9712_poll_touch,
+	.acc_enable = wm9712_acc_enable,
+	.digitiser_ioctl = wm9712_digitiser_ioctl,
+};
+
+EXPORT_SYMBOL_GPL(wm97xx_codec);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.17/drivers/input/touchscreen/wm9713.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/drivers/input/touchscreen/wm9713.c	2006-09-19 20:36:47.969052000 +0200
@@ -0,0 +1,461 @@
+/*
+ * wm9713.c  --  Codec touch driver for Wolfson WM9713 AC97 Codec.
+ *
+ * Copyright 2003, 2004, 2005, 2006 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
+ * Parts Copyright : Ian Molton <spyro@f2s.com>
+ *                   Andrew Zabolotny <zap@homelink.ru>
+ *                   Russell King <rmk@arm.linux.org.uk>
+ *
+ *  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.
+ *
+ *  Revision history
+ *     6th Sep 2006  Mike Arthur <linux@wolfsonmicro.com>
+ *                   Added pre and post sample calls.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/wm97xx.h>
+
+#define TS_NAME			"wm97xx"
+#define WM9713_VERSION		"0.53"
+#define DEFAULT_PRESSURE	0xb0c0
+
+/*
+ * Debug
+ */
+#if 0
+#define dbg(format, arg...) printk(KERN_DEBUG TS_NAME ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...)
+#endif
+#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
+
+/*
+ * Module parameters
+ */
+
+/*
+ * Set internal pull up for pen detect.
+ *
+ * Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
+ * i.e. pull up resistance = 64k Ohms / rpu.
+ *
+ * Adjust this value if you are having problems with pen detect not
+ * detecting any down event.
+ */
+static int rpu = 1;
+module_param(rpu, int, 0);
+MODULE_PARM_DESC(rpu, "Set internal pull up resitor for pen detect.");
+
+/*
+ * Set current used for pressure measurement.
+ *
+ * Set pil = 2 to use 400uA
+ *     pil = 1 to use 200uA and
+ *     pil = 0 to disable pressure measurement.
+ *
+ * This is used to increase the range of values returned by the adc
+ * when measureing touchpanel pressure.
+ */
+static int pil = 0;
+module_param(pil, int, 0);
+MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
+
+/*
+ * Set threshold for pressure measurement.
+ *
+ * Pen down pressure below threshold is ignored.
+ */
+static int pressure = DEFAULT_PRESSURE & 0xfff;
+module_param(pressure, int, 0);
+MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
+
+/*
+ * Set adc sample delay.
+ *
+ * For accurate touchpanel measurements, some settling time may be
+ * required between the switch matrix applying a voltage across the
+ * touchpanel plate and the ADC sampling the signal.
+ *
+ * This delay can be set by setting delay = n, where n is the array
+ * position of the delay in the array delay_table below.
+ * Long delays > 1ms are supported for completeness, but are not
+ * recommended.
+ */
+static int delay = 4;
+module_param(delay, int, 0);
+MODULE_PARM_DESC(delay, "Set adc sample delay.");
+
+/*
+ * Set adc mask function.
+ *
+ * Sources of glitch noise, such as signals driving an LCD display, may feed
+ * through to the touch screen plates and affect measurement accuracy. In
+ * order to minimise this, a signal may be applied to the MASK pin to delay or
+ * synchronise the sampling.
+ *
+ * 0 = No delay or sync
+ * 1 = High on pin stops conversions
+ * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
+ * 3 = Edge triggered, edge on pin starts conversion after delay param
+ */
+static int mask = 0;
+module_param(mask, int, 0);
+MODULE_PARM_DESC(mask, "Set adc mask function.");
+
+/*
+ * Coordinate Polling Enable.
+ *
+ * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
+ * for every poll.
+ */
+static int coord = 1;
+module_param(coord, int, 0);
+MODULE_PARM_DESC(coord, "Polling coordinate mode");
+
+/*
+ * ADC sample delay times in uS
+ */
+static const int delay_table[] = {
+	21,    // 1 AC97 Link frames
+	42,    // 2
+	84,    // 4
+	167,   // 8
+	333,   // 16
+	667,   // 32
+	1000,  // 48
+	1333,  // 64
+	2000,  // 96
+	2667,  // 128
+	3333,  // 160
+	4000,  // 192
+	4667,  // 224
+	5333,  // 256
+	6000,  // 288
+	0      // No delay, switch matrix always on
+};
+
+/*
+ * Delay after issuing a POLL command.
+ *
+ * The delay is 3 AC97 link frames + the touchpanel settling delay
+ */
+static inline void poll_delay(int d)
+{
+	udelay (3 * AC97_LINK_FRAME + delay_table [d]);
+}
+
+/*
+ * set up the physical settings of the WM9713
+ */
+static void init_wm9713_phy(struct wm97xx* wm)
+{
+	u16 dig1 = 0, dig2, dig3;
+
+	/* default values */
+	dig2 = WM97XX_DELAY(4) | WM97XX_SLT(5);
+	dig3= WM9712_RPU(1);
+
+	/* rpu */
+	if (rpu) {
+		dig3 &= 0xffc0;
+		dig3 |= WM9712_RPU(rpu);
+		info("setting pen detect pull-up to %d Ohms",64000 / rpu);
+	}
+
+	/* touchpanel pressure */
+	if (pil == 2) {
+		dig3 |= WM9712_PIL;
+		info("setting pressure measurement current to 400uA.");
+	} else if (pil)
+		info ("setting pressure measurement current to 200uA.");
+	if(!pil)
+		pressure = 0;
+
+	/* sample settling delay */
+	if (delay < 0 || delay > 15) {
+		info ("supplied delay out of range.");
+		delay = 4;
+		info("setting adc sample delay to %d u Secs.", delay_table[delay]);
+	}
+	dig2 &= 0xff0f;
+	dig2 |= WM97XX_DELAY(delay);
+
+	/* mask */
+	dig3 |= ((mask & 0x3) << 4);
+	if(coord)
+		dig3 |= WM9713_WAIT;
+
+	wm->misc = wm97xx_reg_read(wm, 0x5a);
+
+	wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
+	wm97xx_reg_write(wm, AC97_GPIO_STICKY, 0x0);
+}
+
+static int wm9713_digitiser_ioctl(struct wm97xx* wm, int cmd)
+{
+	u16 val = 0;
+
+	switch(cmd){
+	case WM97XX_DIG_START:
+		val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
+		wm97xx_reg_write(wm, AC97_EXTENDED_MID, val & 0x7fff);
+		wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] | WM97XX_PRP_DET_DIG);
+		wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
+		break;
+	case WM97XX_DIG_STOP:
+		wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] & ~WM97XX_PRP_DET_DIG);
+		val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
+		wm97xx_reg_write(wm, AC97_EXTENDED_MID, val | 0x8000);
+		break;
+	case WM97XX_AUX_PREPARE:
+		memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
+		wm97xx_reg_write(wm, AC97_WM9713_DIG1, 0);
+		wm97xx_reg_write(wm, AC97_WM9713_DIG2, 0);
+		wm97xx_reg_write(wm, AC97_WM9713_DIG3, WM97XX_PRP_DET_DIG);
+		break;
+	case WM97XX_DIG_RESTORE:
+		wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]);
+		wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]);
+		wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]);
+		break;
+	case WM97XX_PHY_INIT:
+		init_wm9713_phy(wm);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static inline int is_pden (struct wm97xx* wm)
+{
+	return wm->dig[2] & WM9713_PDEN;
+}
+
+/*
+ * Read a sample from the WM9713 adc in polling mode.
+ */
+static int wm9713_poll_sample (struct wm97xx* wm, int adcsel, int *sample)
+{
+	u16 dig1;
+	int timeout = 5 * delay;
+
+	if (!wm->pen_probably_down) {
+		u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(data & WM97XX_PEN_DOWN))
+			return RC_PENUP;
+		wm->pen_probably_down = 1;
+	}
+
+	/* set up digitiser */
+	if (adcsel & 0x8000)
+		adcsel = 1 << ((adcsel & 0x7fff) + 3);
+
+	dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
+	dig1 &= ~WM9713_ADCSEL_MASK;
+
+	if (wm->mach_ops && wm->mach_ops->pre_sample)
+		wm->mach_ops->pre_sample(adcsel);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | adcsel |WM9713_POLL);
+
+	/* wait 3 AC97 time slots + delay for conversion */
+	poll_delay(delay);
+
+	/* wait for POLL to go low */
+	while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) && timeout) {
+		udelay(AC97_LINK_FRAME);
+		timeout--;
+	}
+
+	if (timeout <= 0) {
+		/* If PDEN is set, we can get a timeout when pen goes up */
+		if (is_pden(wm))
+			wm->pen_probably_down = 0;
+		else
+			dbg ("adc sample timeout");
+		return RC_PENUP;
+	}
+
+	*sample =wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	if (wm->mach_ops && wm->mach_ops->post_sample)
+		wm->mach_ops->post_sample(adcsel);
+
+	/* check we have correct sample */
+	if ((*sample & WM97XX_ADCSRC_MASK) != ffs(adcsel >> 1) << 12) {
+		dbg ("adc wrong sample, read %x got %x", adcsel,
+		     *sample & WM97XX_ADCSRC_MASK);
+		return RC_PENUP;
+	}
+
+	if (!(*sample & WM97XX_PEN_DOWN)) {
+		wm->pen_probably_down = 0;
+		return RC_PENUP;
+	}
+
+	return RC_VALID;
+}
+
+/*
+ * Read a coordinate from the WM9713 adc in polling mode.
+ */
+static int wm9713_poll_coord (struct wm97xx* wm, struct wm97xx_data *data)
+{
+	u16 dig1;
+	int timeout = 5 * delay;
+
+	if (!wm->pen_probably_down) {
+		u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+		if (!(data & WM97XX_PEN_DOWN))
+			return RC_PENUP;
+		wm->pen_probably_down = 1;
+	}
+
+	/* set up digitiser */
+	dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
+	dig1 &= ~WM9713_ADCSEL_MASK;
+	if(pil)
+		dig1 |= WM97XX_ADCSEL_PRES;
+
+	if (wm->mach_ops && wm->mach_ops->pre_sample)
+		wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | WM9713_POLL | WM9713_COO);
+
+	/* wait 3 AC97 time slots + delay for conversion */
+	poll_delay(delay);
+	data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	/* wait for POLL to go low */
+	while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) && timeout) {
+		udelay(AC97_LINK_FRAME);
+		timeout--;
+	}
+
+	if (timeout <= 0) {
+		/* If PDEN is set, we can get a timeout when pen goes up */
+		if (is_pden(wm))
+			wm->pen_probably_down = 0;
+		else
+			dbg ("adc sample timeout");
+		return RC_PENUP;
+	}
+
+	/* read back data */
+	data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	if (pil)
+		data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+	else
+		data->p = DEFAULT_PRESSURE;
+
+	if (wm->mach_ops && wm->mach_ops->post_sample)
+		wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
+
+	/* check we have correct sample */
+	if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
+		goto err;
+	if(pil && !(data->p & WM97XX_ADCSEL_PRES))
+		goto err;
+
+	if (!(data->x & WM97XX_PEN_DOWN)) {
+		wm->pen_probably_down = 0;
+		return RC_PENUP;
+	}
+	return RC_VALID;
+err:
+	return RC_PENUP;
+}
+
+/*
+ * Sample the WM9713 touchscreen in polling mode
+ */
+static int wm9713_poll_touch(struct wm97xx* wm, struct wm97xx_data *data)
+{
+	int rc;
+
+	if(coord) {
+		if((rc = wm9713_poll_coord(wm, data)) != RC_VALID)
+			return rc;
+	} else {
+		if ((rc = wm9713_poll_sample(wm, WM9713_ADCSEL_X, &data->x)) != RC_VALID)
+			return rc;
+		if ((rc = wm9713_poll_sample(wm, WM9713_ADCSEL_Y, &data->y)) != RC_VALID)
+			return rc;
+		if (pil) {
+			if ((rc = wm9713_poll_sample(wm, WM9713_ADCSEL_PRES, &data->p)) != RC_VALID)
+				return rc;
+		} else
+			data->p = DEFAULT_PRESSURE;
+	}
+	return RC_VALID;
+}
+
+/*
+ * Enable WM9713 continuous mode, i.e. touch data is streamed across an AC97 slot
+ */
+static int wm9713_acc_enable (struct wm97xx* wm, int enable)
+{
+	u16 dig1, dig2, dig3;
+	int ret = 0;
+
+	dig1 = wm->dig[0];
+	dig2 = wm->dig[1];
+	dig3 = wm->dig[2];
+
+	if (enable) {
+		/* continous mode */
+		if (wm->mach_ops->acc_startup &&
+			(ret = wm->mach_ops->acc_startup(wm)) < 0)
+			return ret;
+
+		dig1 &= ~WM9713_ADCSEL_MASK;
+		dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X | WM9713_ADCSEL_Y;
+        if (pil)
+		dig1 |= WM9713_ADCSEL_PRES;
+		dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK  | WM97XX_CM_RATE_MASK);
+		dig2 |= WM97XX_SLEN | WM97XX_DELAY (delay) |
+		WM97XX_SLT (wm->acc_slot) | WM97XX_RATE (wm->acc_rate);
+		dig3 |= WM9713_PDEN;
+	} else {
+		dig1 &= ~(WM9713_CTC | WM9713_COO);
+		dig2 &= ~WM97XX_SLEN;
+		dig3 &= ~WM9713_PDEN;
+        if (wm->mach_ops->acc_shutdown)
+            wm->mach_ops->acc_shutdown(wm);
+	}
+
+	wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
+	return ret;
+}
+
+struct wm97xx_codec_drv wm97xx_codec = {
+	.id = 	WM9713_ID2,
+    .name = "wm9713",
+	.poll_sample = wm9713_poll_sample,
+	.poll_touch = wm9713_poll_touch,
+	.acc_enable = wm9713_acc_enable,
+	.digitiser_ioctl = wm9713_digitiser_ioctl,
+};
+
+EXPORT_SYMBOL_GPL(wm97xx_codec);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("WM9713 Touch Screen Driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.17/drivers/input/touchscreen/wm97xx-core.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/drivers/input/touchscreen/wm97xx-core.c	2006-09-19 20:36:47.969052000 +0200
@@ -0,0 +1,912 @@
+/*
+ * wm97xx-core.c  --  Touch screen driver core for Wolfson WM9705, WM9712
+ *                    and WM9713 AC97 Codecs.
+ *
+ * Copyright 2003, 2004, 2005, 2006 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
+ * Parts Copyright : Ian Molton <spyro@f2s.com>
+ *                   Andrew Zabolotny <zap@homelink.ru>
+ *                   Russell King <rmk@arm.linux.org.uk>
+ *
+ *  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:
+ *
+ *  Features:
+ *       - supports WM9705, WM9712, WM9713
+ *       - polling mode
+ *       - continuous mode (arch-dependent)
+ *       - adjustable rpu/dpp settings
+ *       - adjustable pressure current
+ *       - adjustable sample settle delay
+ *       - 4 and 5 wire touchscreens (5 wire is WM9712 only)
+ *       - pen down detection
+ *       - battery monitor
+ *       - sample AUX adc's
+ *       - power management
+ *       - codec GPIO
+ *       - codec event notification
+ * Todo
+ *       - Support for async sampling control for noisy LCD's.
+ *
+ *  Revision history
+ *    7th May 2003   Initial version.
+ *    6th June 2003  Added non module support and AC97 registration.
+ *   18th June 2003  Added AUX adc sampling.
+ *   23rd June 2003  Did some minimal reformatting, fixed a couple of
+ *                   codec_mutexing bugs and noted a race to fix.
+ *   24th June 2003  Added power management and fixed race condition.
+ *   10th July 2003  Changed to a misc device.
+ *   31st July 2003  Moved TS_EVENT and TS_CAL to wm97xx.h
+ *    8th Aug  2003  Added option for read() calling wm97xx_sample_touch()
+ *                   because some ac97_read/ac_97_write call schedule()
+ *    7th Nov  2003  Added Input touch event interface, stanley.cai@intel.com
+ *   13th Nov  2003  Removed h3600 touch interface, added interrupt based
+ *                   pen down notification and implemented continous mode
+ *                   on XScale arch.
+ *   16th Nov  2003  Ian Molton <spyro@f2s.com>
+ *                   Modified so that it suits the new 2.6 driver model.
+ *   25th Jan  2004  Andrew Zabolotny <zap@homelink.ru>
+ *                   Implemented IRQ-driven pen down detection, implemented
+ *                   the private API meant to be exposed to platform-specific
+ *                   drivers, reorganized the driver so that it supports
+ *                   an arbitrary number of devices.
+ *    1st Feb  2004  Moved continuous mode handling to a separate
+ *                   architecture-dependent file. For now only PXA
+ *                   built-in AC97 controller is supported (pxa-ac97-wm97xx.c).
+ *    11th Feb 2004  Reduced CPU usage by keeping a cached copy of both
+ *                   digitizer registers instead of reading them every time.
+ *                   A reorganization of the whole code for better
+ *                   error handling.
+ *    17th Apr 2004  Added BMON support.
+ *    17th Nov 2004  Added codec GPIO, codec event handling (real and virtual
+ *                   GPIOs) and 2.6 power management.
+ *    29th Nov 2004  Added WM9713 support.
+ *     4th Jul 2005  Moved codec specific code out to seperate files.
+ *     6th Sep 2006  Mike Arthur <linux@wolfsonmicro.com>
+ *                   Added bus interface.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/proc_fs.h>
+#include <linux/pm.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/wm97xx.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define TS_NAME			"wm97xx"
+#define WM_CORE_VERSION		"0.63"
+#define DEFAULT_PRESSURE	0xb0c0
+
+/*
+ * WM97xx - enable/disable AUX ADC sysfs
+ */
+static int aux_sys = 1;
+module_param(aux_sys, int, 0);
+MODULE_PARM_DESC(aux_sys, "enable AUX ADC sysfs entries");
+
+/*
+ * WM97xx - enable/disable codec status sysfs
+ */
+static int status_sys = 1;
+module_param(status_sys, int, 0);
+MODULE_PARM_DESC(status_sys, "enable codec status sysfs entries");
+
+/*
+ * Touchscreen absolute values
+ *
+ * These parameters are used to help the input layer discard out of
+ * range readings and reduce jitter etc.
+ *
+ *   o min, max:- indicate the min and max values your touch screen returns
+ *   o fuzz:- use a higher number to reduce jitter
+ *
+ * The default values correspond to Mainstone II in QVGA mode
+ *
+ * Please read
+ * Documentation/input/input-programming.txt for more details.
+ */
+
+static int abs_x[3] = {350,3900,5};
+module_param_array(abs_x, int, NULL, 0);
+MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
+
+static int abs_y[3] = {320,3750,40};
+module_param_array(abs_y, int, NULL, 0);
+MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
+
+static int abs_p[3] = {0,150,4};
+module_param_array(abs_p, int, NULL, 0);
+MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
+
+/*
+ * Debug
+ */
+#if 0
+#define dbg(format, arg...) printk(KERN_DEBUG TS_NAME ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...)
+#endif
+#define err(format, arg...) printk(KERN_ERR TS_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) printk(KERN_INFO TS_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING TS_NAME ": " format "\n" , ## arg)
+
+/* codec AC97 IO access */
+int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
+{
+	if (wm->ac97)
+		return wm->ac97->bus->ops->read(wm->ac97, reg);
+	else
+		return -1;
+}
+
+void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
+{
+	/* cache digitiser registers */
+	if(reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
+		wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
+
+	/* cache gpio regs */
+	if(reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
+		wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
+
+	/* wm9713 irq reg */
+	if(reg == 0x5a)
+		wm->misc = val;
+
+	if (wm->ac97)
+		wm->ac97->bus->ops->write(wm->ac97, reg, val);
+}
+
+
+/**
+ *	wm97xx_read_aux_adc - Read the aux adc.
+ *	@wm: wm97xx device.
+ *  @adcsel: codec ADC to be read
+ *
+ *	Reads the selected AUX ADC.
+ */
+
+int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
+{
+	int power_adc = 0, auxval;
+	u16 power = 0;
+
+	/* get codec */
+	mutex_lock(&wm->codec_mutex);
+
+	/* When the touchscreen is not in use, we may have to power up the AUX ADC
+	 * before we can use sample the AUX inputs->
+	 */
+	if (wm->id == WM9713_ID2 &&
+	    (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
+		power_adc = 1;
+		wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
+	}
+
+	/* Prepare the codec for AUX reading */
+	wm->codec->digitiser_ioctl(wm, WM97XX_AUX_PREPARE);
+
+	/* Turn polling mode on to read AUX ADC */
+	wm->pen_probably_down = 1;
+	wm->codec->poll_sample(wm, adcsel, &auxval);
+
+	if (power_adc)
+		wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
+
+	wm->codec->digitiser_ioctl(wm, WM97XX_DIG_RESTORE);
+
+	wm->pen_probably_down = 0;
+
+	mutex_unlock(&wm->codec_mutex);
+	return auxval & 0xfff;
+}
+
+#define WM97XX_AUX_ATTR(name,input) \
+static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf)   \
+{ \
+	struct wm97xx *wm = (struct wm97xx*)dev->driver_data; \
+	return sprintf(buf, "%d\n", wm97xx_read_aux_adc(wm, input)); \
+} \
+static DEVICE_ATTR(name, 0444, name##_show, NULL)
+
+WM97XX_AUX_ATTR(aux1, WM97XX_AUX_ID1);
+WM97XX_AUX_ATTR(aux2, WM97XX_AUX_ID2);
+WM97XX_AUX_ATTR(aux3, WM97XX_AUX_ID3);
+WM97XX_AUX_ATTR(aux4, WM97XX_AUX_ID4);
+
+#define WM97XX_STATUS_ATTR(name) \
+static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf)   \
+{ \
+	struct wm97xx *wm = (struct wm97xx*)dev->driver_data; \
+	return sprintf(buf, "%d\n", wm97xx_reg_read(wm, AC97_GPIO_STATUS)); \
+} \
+static DEVICE_ATTR(name, 0444, name##_show, NULL)
+
+WM97XX_STATUS_ATTR(gpio);
+
+static int wm97xx_sys_add(struct device *dev)
+{
+	if (aux_sys) {
+		device_create_file(dev, &dev_attr_aux1);
+		device_create_file(dev, &dev_attr_aux2);
+		device_create_file(dev, &dev_attr_aux3);
+		device_create_file(dev, &dev_attr_aux4);
+	}
+	if (status_sys)
+		device_create_file(dev, &dev_attr_gpio);
+	return 0;
+}
+
+static void wm97xx_sys_remove(struct device *dev)
+{
+	if (status_sys)
+		device_remove_file(dev, &dev_attr_gpio);
+	if (aux_sys) {
+		device_remove_file(dev, &dev_attr_aux1);
+		device_remove_file(dev, &dev_attr_aux2);
+		device_remove_file(dev, &dev_attr_aux3);
+		device_remove_file(dev, &dev_attr_aux4);
+	}
+}
+
+/**
+ *	wm97xx_get_gpio - Get the status of a codec GPIO.
+ *	@wm: wm97xx device.
+ *  @gpio: gpio
+ *
+ *	Get the status of a codec GPIO pin
+ */
+
+wm97xx_gpio_status_t wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
+{
+	u16 status;
+	wm97xx_gpio_status_t ret;
+
+	mutex_lock(&wm->codec_mutex);
+	status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
+
+	if (status & gpio)
+		ret = WM97XX_GPIO_HIGH;
+	else
+		ret = WM97XX_GPIO_LOW;
+
+	mutex_unlock(&wm->codec_mutex);
+	return ret;
+}
+
+/**
+ *	wm97xx_set_gpio - Set the status of a codec GPIO.
+ *	@wm: wm97xx device.
+ *  @gpio: gpio
+ *
+ *
+ *	Set the status of a codec GPIO pin
+ */
+
+void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
+				wm97xx_gpio_status_t status)
+{
+	u16 reg;
+
+	mutex_lock(&wm->codec_mutex);
+	reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
+
+	if (status & WM97XX_GPIO_HIGH)
+		reg |= gpio;
+	else
+		reg &= ~gpio;
+
+	if (wm->id == WM9712_ID2)
+		wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
+	else
+		wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
+	mutex_unlock(&wm->codec_mutex);
+}
+
+/*
+ * Codec GPIO pin configuration, this set's pin direction, polarity,
+ * stickyness and wake up.
+ */
+void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, wm97xx_gpio_dir_t dir,
+		   wm97xx_gpio_pol_t pol, wm97xx_gpio_sticky_t sticky,
+		   wm97xx_gpio_wake_t wake)
+{
+	u16 reg;
+
+	mutex_lock(&wm->codec_mutex);
+	reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
+
+	if (pol == WM97XX_GPIO_POL_HIGH)
+		reg |= gpio;
+	else
+		reg &= ~gpio;
+
+	wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
+	reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
+
+	if (sticky == WM97XX_GPIO_STICKY)
+		reg |= gpio;
+	else
+		reg &= ~gpio;
+
+	wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
+	reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
+
+	if (wake == WM97XX_GPIO_WAKE)
+		reg |= gpio;
+	else
+		reg &= ~gpio;
+
+	wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
+	reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
+
+	if (dir == WM97XX_GPIO_IN)
+		reg |= gpio;
+	else
+		reg &= ~gpio;
+
+	wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
+	mutex_unlock(&wm->codec_mutex);
+}
+
+/*
+ * Handle a pen down interrupt.
+ */
+static void wm97xx_pen_irq_worker(void *ptr)
+{
+	struct wm97xx *wm = (struct wm97xx *) ptr;
+
+	/* do we need to enable the touch panel reader */
+	if (wm->id == WM9705_ID2) {
+		if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & WM97XX_PEN_DOWN)
+			wm->pen_is_down = 1;
+		else
+			wm->pen_is_down = 0;
+		wake_up_interruptible(&wm->pen_irq_wait);
+	} else {
+		u16 status, pol;
+		mutex_lock(&wm->codec_mutex);
+		status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
+		pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
+
+		if (WM97XX_GPIO_13 & pol & status) {
+			wm->pen_is_down = 1;
+			wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & ~WM97XX_GPIO_13);
+		} else {
+			wm->pen_is_down = 0;
+		    wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | WM97XX_GPIO_13);
+		}
+
+		if (wm->id == WM9712_ID2)
+			wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & ~WM97XX_GPIO_13) << 1);
+		else
+			wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & ~WM97XX_GPIO_13);
+		mutex_unlock(&wm->codec_mutex);
+		wake_up_interruptible(&wm->pen_irq_wait);
+	}
+
+	if (!wm->pen_is_down && wm->mach_ops && wm->mach_ops->acc_enabled)
+		wm->mach_ops->acc_pen_up(wm);
+	enable_irq(wm->pen_irq);
+}
+
+/*
+ * Codec PENDOWN irq handler
+ *
+ * We have to disable the codec interrupt in the handler because it can
+ * take upto 1ms to clear the interrupt source. The interrupt is then enabled
+ * again in the slow handler when the source has been cleared.
+ */
+static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id,
+					struct pt_regs *regs)
+{
+	struct wm97xx *wm = (struct wm97xx *) dev_id;
+	disable_irq(wm->pen_irq);
+	queue_work(wm->pen_irq_workq, &wm->pen_event_work);
+	return IRQ_HANDLED;
+}
+
+/*
+ * initialise pen IRQ handler and workqueue
+ */
+static int wm97xx_init_pen_irq(struct wm97xx *wm)
+{
+	u16 reg;
+
+	INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker, wm);
+	if ((wm->pen_irq_workq =
+		create_singlethread_workqueue("kwm97pen")) == NULL) {
+		err("could not create pen irq work queue");
+		wm->pen_irq = 0;
+		return -EINVAL;
+	}
+
+	if (request_irq (wm->pen_irq, wm97xx_pen_interrupt, SA_SHIRQ, "wm97xx-pen", wm)) {
+		err("could not register codec pen down interrupt, will poll for pen down");
+		destroy_workqueue(wm->pen_irq_workq);
+		wm->pen_irq = 0;
+		return -EINVAL;
+	}
+
+	/* enable PEN down on wm9712/13 */
+	if (wm->id != WM9705_ID2) {
+		reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
+		wm97xx_reg_write(wm, AC97_MISC_AFE, reg & 0xfffb);
+		reg = wm97xx_reg_read(wm, 0x5a);
+		wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
+	}
+
+	return 0;
+}
+
+/* Private struct for communication between struct wm97xx_tshread
+ * and wm97xx_read_samples */
+struct ts_state {
+	int sleep_time;
+	int min_sleep_time;
+};
+
+static int wm97xx_read_samples(struct wm97xx *wm, struct ts_state *state)
+{
+	struct wm97xx_data data;
+	int rc;
+
+	mutex_lock(&wm->codec_mutex);
+
+    if (wm->mach_ops && wm->mach_ops->acc_enabled)
+	   rc = wm->mach_ops->acc_pen_down(wm);
+    else
+        rc = wm->codec->poll_touch(wm, &data);
+
+	if (rc & RC_PENUP) {
+		if (wm->pen_is_down) {
+			wm->pen_is_down = 0;
+			dbg("pen up");
+			input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
+			input_sync(wm->input_dev);
+		} else if (!(rc & RC_AGAIN)) {
+			/* We need high frequency updates only while pen is down,
+			* the user never will be able to touch screen faster than
+			* a few times per second... On the other hand, when the
+			* user is actively working with the touchscreen we don't
+			* want to lose the quick response. So we will slowly
+			* increase sleep time after the pen is up and quicky
+			* restore it to ~one task switch when pen is down again.
+			*/
+			if (state->sleep_time < HZ / 10)
+				state->sleep_time++;
+		}
+
+	} else if (rc & RC_VALID) {
+		dbg("pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
+			data.x >> 12, data.x & 0xfff, data.y >> 12,
+			data.y & 0xfff, data.p >> 12, data.p & 0xfff);
+		input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
+		input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
+		input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
+		input_sync(wm->input_dev);
+		wm->pen_is_down = 1;
+		state->sleep_time = state->min_sleep_time;
+	} else if (rc & RC_PENDOWN) {
+		dbg("pen down");
+		wm->pen_is_down = 1;
+		state->sleep_time = state->min_sleep_time;
+	}
+
+	mutex_unlock(&wm->codec_mutex);
+	return rc;
+}
+
+/*
+* The touchscreen sample reader thread.
+*/
+static int wm97xx_ts_read(void *data)
+{
+	int rc;
+	struct ts_state state;
+	struct wm97xx *wm = (struct wm97xx *) data;
+
+	/* set up thread context */
+	wm->ts_task = current;
+	daemonize("kwm97xxts");
+
+	if (wm->codec == NULL) {
+		wm->ts_task = NULL;
+		printk(KERN_ERR "codec is NULL, bailing\n");
+	}
+
+	complete(&wm->ts_init);
+	wm->pen_is_down = 0;
+	state.min_sleep_time = HZ >= 100 ? HZ / 100 : 1;
+	if (state.min_sleep_time < 1)
+		state.min_sleep_time = 1;
+	state.sleep_time = state.min_sleep_time;
+
+	/* touch reader loop */
+	while (wm->ts_task) {
+		do {
+			try_to_freeze();
+			rc = wm97xx_read_samples(wm, &state);
+		} while (rc & RC_AGAIN);
+		if (!wm->pen_is_down && wm->pen_irq) {
+			/* Nice, we don't have to poll for pen down event */
+			wait_event_interruptible(wm->pen_irq_wait, wm->pen_is_down);
+		} else {
+			set_task_state(current, TASK_INTERRUPTIBLE);
+			schedule_timeout(state.sleep_time);
+		}
+	}
+	complete_and_exit(&wm->ts_exit, 0);
+}
+
+/**
+ *	wm97xx_ts_input_open - Open the touch screen input device.
+ *	@idev:	Input device to be opened.
+ *
+ *	Called by the input sub system to open a wm97xx touchscreen device.
+ *  Starts the touchscreen thread and touch digitiser.
+ */
+static int wm97xx_ts_input_open(struct input_dev *idev)
+{
+	int ret = 0;
+	struct wm97xx *wm = (struct wm97xx *) idev->private;
+
+	mutex_lock(&wm->codec_mutex);
+	/* first time opened ? */
+	if (wm->ts_use_count++ == 0) {
+		/* start touchscreen thread */
+		init_completion(&wm->ts_init);
+		init_completion(&wm->ts_exit);
+		ret = kernel_thread(wm97xx_ts_read, wm, CLONE_KERNEL);
+
+		if (ret >= 0) {
+			wait_for_completion(&wm->ts_init);
+			if (wm->ts_task == NULL)
+				ret = -EINVAL;
+		} else {
+			mutex_unlock(&wm->codec_mutex);
+			return ret;
+		}
+
+		/* start digitiser */
+        if (wm->mach_ops && wm->mach_ops->acc_enabled)
+            wm->codec->acc_enable(wm, 1);
+		wm->codec->digitiser_ioctl(wm, WM97XX_DIG_START);
+
+		/* init pen down/up irq handling */
+		if (wm->pen_irq) {
+			wm97xx_init_pen_irq(wm);
+
+			if (wm->pen_irq == 0) {
+				/* we failed to get an irq for pen down events,
+				 * so we resort to polling. kickstart the reader */
+				wm->pen_is_down = 1;
+				wake_up_interruptible(&wm->pen_irq_wait);
+			}
+		}
+	}
+
+	mutex_unlock(&wm->codec_mutex);
+	return 0;
+}
+
+/**
+ *	wm97xx_ts_input_close - Close the touch screen input device.
+ *	@idev:	Input device to be closed.
+ *
+ *	Called by the input sub system to close a wm97xx touchscreen device.
+ *  Kills the touchscreen thread and stops the touch digitiser.
+ */
+
+static void wm97xx_ts_input_close(struct input_dev *idev)
+{
+	struct wm97xx *wm = (struct wm97xx *) idev->private;
+
+	mutex_lock(&wm->codec_mutex);
+	if (--wm->ts_use_count == 0) {
+		/* destroy workqueues and free irqs */
+		if (wm->pen_irq) {
+			free_irq(wm->pen_irq, wm);
+			destroy_workqueue(wm->pen_irq_workq);
+		}
+
+		/* kill thread */
+		if (wm->ts_task) {
+			wm->ts_task = NULL;
+			wm->pen_is_down = 1;
+			wake_up_interruptible(&wm->pen_irq_wait);
+			wait_for_completion(&wm->ts_exit);
+			wm->pen_is_down = 0;
+		}
+
+		/* stop digitiser */
+		wm->codec->digitiser_ioctl(wm, WM97XX_DIG_STOP);
+		if (wm->mach_ops && wm->mach_ops->acc_enabled)
+			wm->codec->acc_enable(wm, 0);
+	}
+	mutex_unlock(&wm->codec_mutex);
+}
+
+static int wm97xx_bus_match(struct device *dev, struct device_driver *drv)
+{
+    return !(strcmp(dev->bus_id,drv->name));
+}
+
+/*
+ * The AC97 audio driver will do all the Codec suspend and resume
+ * tasks. This is just for anything machine specific or extra.
+ */
+static int wm97xx_bus_suspend(struct device *dev, pm_message_t state)
+{
+    int ret = 0;
+
+    if (dev->driver && dev->driver->suspend)
+        ret = dev->driver->suspend(dev, state);
+
+    return ret;
+}
+
+static int wm97xx_bus_resume(struct device *dev)
+{
+    int ret = 0;
+
+    if (dev->driver && dev->driver->resume)
+        ret = dev->driver->resume(dev);
+
+    return ret;
+}
+
+struct bus_type wm97xx_bus_type = {
+    .name       = "wm97xx",
+    .match      = wm97xx_bus_match,
+    .suspend    = wm97xx_bus_suspend,
+    .resume     = wm97xx_bus_resume,
+};
+
+static void  wm97xx_release(struct device *dev)
+{
+    kfree(dev);
+}
+
+static int wm97xx_probe(struct device *dev)
+{
+	struct wm97xx* wm;
+	int ret = 0, id = 0;
+
+	if (!(wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL)))
+		return -ENOMEM;
+    mutex_init(&wm->codec_mutex);
+
+	init_waitqueue_head(&wm->pen_irq_wait);
+	wm->dev = dev;
+	dev->driver_data = wm;
+	wm->ac97 = to_ac97_t(dev);
+
+	/* check that we have a supported codec */
+	if ((id = wm97xx_reg_read(wm, AC97_VENDOR_ID1)) != WM97XX_ID1) {
+		err("could not find a wm97xx, found a %x instead\n", id);
+		kfree(wm);
+		return -ENODEV;
+	}
+
+	wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
+	if(wm->id != wm97xx_codec.id) {
+		err("could not find a the selected codec, please build for wm97%2x", wm->id & 0xff);
+		kfree(wm);
+		return -ENODEV;
+	}
+
+	if((wm->input_dev = input_allocate_device()) == NULL) {
+        kfree(wm);
+		return -ENOMEM;
+    }
+
+	/* set up touch configuration */
+	info("detected a wm97%2x codec", wm->id & 0xff);
+	wm->input_dev->name = "wm97xx touchscreen";
+	wm->input_dev->open = wm97xx_ts_input_open;
+	wm->input_dev->close = wm97xx_ts_input_close;
+	set_bit(EV_ABS, wm->input_dev->evbit);
+	set_bit(ABS_X, wm->input_dev->absbit);
+	set_bit(ABS_Y, wm->input_dev->absbit);
+	set_bit(ABS_PRESSURE, wm->input_dev->absbit);
+	wm->input_dev->absmax[ABS_X] = abs_x[1];
+	wm->input_dev->absmax[ABS_Y] = abs_y[1];
+	wm->input_dev->absmax[ABS_PRESSURE] = abs_p[1];
+	wm->input_dev->absmin[ABS_X] = abs_x[0];
+	wm->input_dev->absmin[ABS_Y] = abs_y[0];
+	wm->input_dev->absmin[ABS_PRESSURE] = abs_p[0];
+	wm->input_dev->absfuzz[ABS_X] = abs_x[2];
+	wm->input_dev->absfuzz[ABS_Y] = abs_y[2];
+	wm->input_dev->absfuzz[ABS_PRESSURE] = abs_p[2];
+	wm->input_dev->private = wm;
+	wm->codec = &wm97xx_codec;
+	if((ret = input_register_device(wm->input_dev)) < 0) {
+		kfree(wm);
+		return -ENOMEM;
+    }
+
+	if(aux_sys)
+		wm97xx_sys_add(dev);
+
+	/* set up physical characteristics */
+	wm->codec->digitiser_ioctl(wm, WM97XX_PHY_INIT);
+
+	/* load gpio cache */
+	wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
+	wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
+	wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
+	wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
+	wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
+	wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
+
+	/* register our battery device */
+    if (!(wm->battery_dev = kzalloc(sizeof(struct device), GFP_KERNEL))) {
+    	ret = -ENOMEM;
+        goto batt_err;
+    }
+    wm->battery_dev->bus = &wm97xx_bus_type;
+    strcpy(wm->battery_dev->bus_id,"wm97xx-battery");
+    wm->battery_dev->driver_data = wm;
+    wm->battery_dev->parent = dev;
+    wm->battery_dev->release = wm97xx_release;
+    if((ret = device_register(wm->battery_dev)) < 0)
+    	goto batt_reg_err;
+
+	/* register our extended touch device (for machine specific extensions) */
+    if (!(wm->touch_dev = kzalloc(sizeof(struct device), GFP_KERNEL))) {
+    	ret = -ENOMEM;
+        goto touch_err;
+    }
+    wm->touch_dev->bus = &wm97xx_bus_type;
+    strcpy(wm->touch_dev->bus_id,"wm97xx-touchscreen");
+    wm->touch_dev->driver_data = wm;
+    wm->touch_dev->parent = dev;
+    wm->touch_dev->release = wm97xx_release;
+    if((ret = device_register(wm->touch_dev)) < 0)
+    	goto touch_reg_err;
+
+    return ret;
+
+touch_reg_err:
+	kfree(wm->touch_dev);
+touch_err:
+    device_unregister(wm->battery_dev);
+batt_reg_err:
+	kfree(wm->battery_dev);
+batt_err:
+    input_unregister_device(wm->input_dev);
+    kfree(wm);
+    return ret;
+}
+
+static int wm97xx_remove(struct device *dev)
+{
+	struct wm97xx *wm = dev_get_drvdata(dev);
+
+	/* Stop touch reader thread */
+	if (wm->ts_task) {
+		wm->ts_task = NULL;
+		wm->pen_is_down = 1;
+		wake_up_interruptible(&wm->pen_irq_wait);
+		wait_for_completion(&wm->ts_exit);
+	}
+	device_unregister(wm->battery_dev);
+	device_unregister(wm->touch_dev);
+    input_unregister_device(wm->input_dev);
+
+	if(aux_sys)
+		wm97xx_sys_remove(dev);
+
+	kfree(wm);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+int wm97xx_resume(struct device* dev)
+{
+	struct wm97xx *wm = dev_get_drvdata(dev);
+
+	/* restore digitiser and gpio's */
+	if(wm->id == WM9713_ID2) {
+		wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
+		wm97xx_reg_write(wm, 0x5a, wm->misc);
+		if(wm->ts_use_count) {
+			u16 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
+			wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
+		}
+	}
+
+	wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
+	wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
+
+	wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
+	wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
+	wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
+	wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
+	wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
+	wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
+
+	return 0;
+}
+
+#else
+#define wm97xx_resume		NULL
+#endif
+
+int wm97xx_register_mach_ops(struct wm97xx *wm, struct wm97xx_mach_ops *mach_ops)
+{
+	mutex_lock(&wm->codec_mutex);
+    if(wm->mach_ops) {
+    	mutex_unlock(&wm->codec_mutex);
+    	return -EINVAL;
+    }
+    wm->mach_ops = mach_ops;
+    mutex_unlock(&wm->codec_mutex);
+    return 0;
+}
+
+void wm97xx_unregister_mach_ops(struct wm97xx *wm)
+{
+	mutex_lock(&wm->codec_mutex);
+    wm->mach_ops = NULL;
+    mutex_unlock(&wm->codec_mutex);
+}
+
+static struct device_driver wm97xx_driver = {
+	.name = 	"ac97",
+	.bus = 		&ac97_bus_type,
+	.owner = 	THIS_MODULE,
+	.probe = 	wm97xx_probe,
+	.remove = 	wm97xx_remove,
+	.resume =	wm97xx_resume,
+};
+
+static int __init wm97xx_init(void)
+{
+	int ret;
+
+	info("version %s liam.girdwood@wolfsonmicro.com", WM_CORE_VERSION);
+    if((ret = bus_register(&wm97xx_bus_type)) < 0)
+    	return ret;
+	return driver_register(&wm97xx_driver);
+}
+
+static void __exit wm97xx_exit(void)
+{
+	driver_unregister(&wm97xx_driver);
+    bus_unregister(&wm97xx_bus_type);
+}
+
+EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
+EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
+EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
+EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
+EXPORT_SYMBOL_GPL(wm97xx_reg_read);
+EXPORT_SYMBOL_GPL(wm97xx_reg_write);
+EXPORT_SYMBOL_GPL(wm97xx_bus_type);
+EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
+EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
+
+module_init(wm97xx_init);
+module_exit(wm97xx_exit);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.17/include/linux/wm97xx.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17/include/linux/wm97xx.h	2006-09-19 20:36:47.973052250 +0200
@@ -0,0 +1,291 @@
+
+/*
+ * Register bits and API for Wolfson WM97xx series of codecs
+ */
+
+#ifndef _LINUX_WM97XX_H
+#define _LINUX_WM97XX_H
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/input.h>	/* Input device layer */
+
+/*
+ * WM97xx AC97 Touchscreen registers
+ */
+#define AC97_WM97XX_DIGITISER1		0x76
+#define AC97_WM97XX_DIGITISER2		0x78
+#define AC97_WM97XX_DIGITISER_RD 	0x7a
+#define AC97_WM9713_DIG1			0x74
+#define AC97_WM9713_DIG2			AC97_WM97XX_DIGITISER1
+#define AC97_WM9713_DIG3			AC97_WM97XX_DIGITISER2
+
+/*
+ * WM97xx register bits
+ */
+#define WM97XX_POLL			0x8000	/* initiate a polling measurement */
+#define WM97XX_ADCSEL_X		0x1000	/* x coord measurement */
+#define WM97XX_ADCSEL_Y		0x2000	/* y coord measurement */
+#define WM97XX_ADCSEL_PRES	0x3000	/* pressure measurement */
+#define WM97XX_ADCSEL_MASK	0x7000
+#define WM97XX_COO			0x0800	/* enable coordinate mode */
+#define WM97XX_CTC			0x0400	/* enable continuous mode */
+#define WM97XX_CM_RATE_93	0x0000	/* 93.75Hz continuous rate */
+#define WM97XX_CM_RATE_187	0x0100	/* 187.5Hz continuous rate */
+#define WM97XX_CM_RATE_375	0x0200	/* 375Hz continuous rate */
+#define WM97XX_CM_RATE_750	0x0300	/* 750Hz continuous rate */
+#define WM97XX_CM_RATE_8K	0x00f0	/* 8kHz continuous rate */
+#define WM97XX_CM_RATE_12K	0x01f0	/* 12kHz continuous rate */
+#define WM97XX_CM_RATE_24K	0x02f0	/* 24kHz continuous rate */
+#define WM97XX_CM_RATE_48K	0x03f0	/* 48kHz continuous rate */
+#define WM97XX_CM_RATE_MASK	0x03f0
+#define WM97XX_RATE(i)		(((i & 3) << 8) | ((i & 4) ? 0xf0 : 0))
+#define WM97XX_DELAY(i)		((i << 4) & 0x00f0)	/* sample delay times */
+#define WM97XX_DELAY_MASK	0x00f0
+#define WM97XX_SLEN			0x0008	/* slot read back enable */
+#define WM97XX_SLT(i)		((i - 5) & 0x7)	/* touchpanel slot selection (5-11) */
+#define WM97XX_SLT_MASK		0x0007
+#define WM97XX_PRP_DETW		0x4000	/* pen detect on, digitiser off, wake up */
+#define WM97XX_PRP_DET		0x8000	/* pen detect on, digitiser off, no wake up */
+#define WM97XX_PRP_DET_DIG	0xc000	/* pen detect on, digitiser on */
+#define WM97XX_RPR			0x2000	/* wake up on pen down */
+#define WM97XX_PEN_DOWN		0x8000	/* pen is down */
+#define WM97XX_ADCSRC_MASK	0x7000	/* ADC source mask */
+
+#define WM97XX_AUX_ID1		0x8001
+#define WM97XX_AUX_ID2		0x8002
+#define WM97XX_AUX_ID3		0x8003
+#define WM97XX_AUX_ID4		0x8004
+
+
+/* WM9712 Bits */
+#define WM9712_45W			0x1000	/* set for 5-wire touchscreen */
+#define WM9712_PDEN			0x0800	/* measure only when pen down */
+#define WM9712_WAIT			0x0200	/* wait until adc is read before next sample */
+#define WM9712_PIL			0x0100	/* current used for pressure measurement. set 400uA else 200uA */
+#define WM9712_MASK_HI		0x0040	/* hi on mask pin (47) stops conversions */
+#define WM9712_MASK_EDGE	0x0080	/* rising/falling edge on pin delays sample */
+#define	WM9712_MASK_SYNC	0x00c0	/* rising/falling edge on mask initiates sample */
+#define WM9712_RPU(i)		(i&0x3f)	/* internal pull up on pen detect (64k / rpu) */
+#define WM9712_PD(i)		(0x1 << i)	/* power management */
+
+/* WM9712 Registers */
+#define AC97_WM9712_POWER	0x24
+#define AC97_WM9712_REV		0x58
+
+/* WM9705 Bits */
+#define WM9705_PDEN			0x1000	/* measure only when pen is down */
+#define WM9705_PINV			0x0800	/* inverts sense of pen down output */
+#define WM9705_BSEN			0x0400	/* BUSY flag enable, pin47 is 1 when busy */
+#define WM9705_BINV			0x0200	/* invert BUSY (pin47) output */
+#define WM9705_WAIT			0x0100	/* wait until adc is read before next sample */
+#define WM9705_PIL			0x0080	/* current used for pressure measurement. set 400uA else 200uA */
+#define WM9705_PHIZ			0x0040	/* set PHONE and PCBEEP inputs to high impedance */
+#define WM9705_MASK_HI		0x0010	/* hi on mask stops conversions */
+#define WM9705_MASK_EDGE	0x0020	/* rising/falling edge on pin delays sample */
+#define	WM9705_MASK_SYNC	0x0030	/* rising/falling edge on mask initiates sample */
+#define WM9705_PDD(i)		(i & 0x000f)	/* pen detect comparator threshold */
+
+
+/* WM9713 Bits */
+#define WM9713_PDPOL		0x0400	/* Pen down polarity */
+#define WM9713_POLL			0x0200	/* initiate a polling measurement */
+#define WM9713_CTC			0x0100	/* enable continuous mode */
+#define WM9713_ADCSEL_X		0x0002	/* X measurement */
+#define WM9713_ADCSEL_Y		0x0004	/* Y measurement */
+#define WM9713_ADCSEL_PRES	0x0008	/* Pressure measurement */
+#define WM9713_COO			0x0001	/* enable coordinate mode */
+#define WM9713_PDEN			0x0800	/* measure only when pen down */
+#define WM9713_ADCSEL_MASK	0x00fe	/* ADC selection mask */
+#define WM9713_WAIT			0x0200	/* coordinate wait */
+
+/* AUX ADC ID's */
+#define TS_COMP1			0x0
+#define TS_COMP2			0x1
+#define TS_BMON				0x2
+#define TS_WIPER			0x3
+
+/* ID numbers */
+#define WM97XX_ID1			0x574d
+#define WM9712_ID2			0x4c12
+#define WM9705_ID2			0x4c05
+#define WM9713_ID2			0x4c13
+
+/* Codec GPIO's */
+#define WM97XX_MAX_GPIO		16
+#define WM97XX_GPIO_1		(1 << 1)
+#define WM97XX_GPIO_2		(1 << 2)
+#define WM97XX_GPIO_3		(1 << 3)
+#define WM97XX_GPIO_4		(1 << 4)
+#define WM97XX_GPIO_5		(1 << 5)
+#define WM97XX_GPIO_6		(1 << 6)
+#define WM97XX_GPIO_7		(1 << 7)
+#define WM97XX_GPIO_8		(1 << 8)
+#define WM97XX_GPIO_9		(1 << 9)
+#define WM97XX_GPIO_10		(1 << 10)
+#define WM97XX_GPIO_11		(1 << 11)
+#define WM97XX_GPIO_12		(1 << 12)
+#define WM97XX_GPIO_13		(1 << 13)
+#define WM97XX_GPIO_14		(1 << 14)
+#define WM97XX_GPIO_15		(1 << 15)
+
+
+#define AC97_LINK_FRAME		21	/* time in uS for AC97 link frame */
+
+
+/*---------------- Return codes from sample reading functions ---------------*/
+
+/* More data is available; call the sample gathering function again */
+#define RC_AGAIN			0x00000001
+/* The returned sample is valid */
+#define RC_VALID			0x00000002
+/* The pen is up (the first RC_VALID without RC_PENUP means pen is down) */
+#define RC_PENUP			0x00000004
+/* The pen is down (RC_VALID implies RC_PENDOWN, but sometimes it is helpful
+   to tell the handler that the pen is down but we don't know yet his coords,
+   so the handler should not sleep or wait for pendown irq) */
+#define RC_PENDOWN			0x00000008
+
+/* The wm97xx driver provides a private API for writing platform-specific
+ * drivers.
+ */
+
+/* The structure used to return arch specific sampled data into */
+struct wm97xx_data {
+    int x;
+    int y;
+    int p;
+};
+
+/* Codec GPIO status
+ */
+typedef enum {
+    WM97XX_GPIO_HIGH,
+    WM97XX_GPIO_LOW
+} wm97xx_gpio_status_t;
+
+/* Codec GPIO direction
+ */
+typedef enum {
+    WM97XX_GPIO_IN,
+    WM97XX_GPIO_OUT
+} wm97xx_gpio_dir_t;
+
+/* Codec GPIO polarity
+ */
+typedef enum {
+    WM97XX_GPIO_POL_HIGH,
+    WM97XX_GPIO_POL_LOW
+} wm97xx_gpio_pol_t;
+
+/* Codec GPIO sticky
+ */
+typedef enum {
+    WM97XX_GPIO_STICKY,
+    WM97XX_GPIO_NOTSTICKY
+} wm97xx_gpio_sticky_t;
+
+/* Codec GPIO wake
+ */
+typedef enum {
+    WM97XX_GPIO_WAKE,
+    WM97XX_GPIO_NOWAKE
+} wm97xx_gpio_wake_t;
+
+
+/*
+ * Digitiser ioctl commands
+ */
+#define WM97XX_DIG_START	0x1
+#define WM97XX_DIG_STOP		0x2
+#define WM97XX_PHY_INIT		0x3
+#define WM97XX_AUX_PREPARE	0x4
+#define WM97XX_DIG_RESTORE	0x5
+
+struct wm97xx;
+extern struct wm97xx_codec_drv wm97xx_codec;
+
+/*
+ * Codec driver interface - allows mapping to WM9705/12/13 and newer codecs
+ */
+struct wm97xx_codec_drv {
+	u16 id;
+    char *name;
+	int (*poll_sample) (struct wm97xx *, int adcsel, int *sample);	/* read 1 sample */
+	int (*poll_touch) (struct wm97xx *, struct wm97xx_data *);	/* read X,Y,[P] in poll */
+	int (*digitiser_ioctl) (struct wm97xx *, int cmd);
+	int (*acc_enable) (struct wm97xx *, int enable);
+};
+
+
+/* Machine specific and accelerated touch operations */
+struct wm97xx_mach_ops {
+
+	/* accelerated touch readback - coords are transmited on AC97 link */
+	int acc_enabled;
+    void (*acc_pen_up) (struct wm97xx *);
+    int (*acc_pen_down) (struct wm97xx *);
+    int (*acc_startup) (struct wm97xx *);
+    void (*acc_shutdown) (struct wm97xx *);
+
+    /* pre and post sample - can be used to minimise any analog noise */
+    void (*pre_sample) (int);  /* function to run before sampling */
+    void (*post_sample) (int);  /* function to run after sampling */
+};
+
+struct wm97xx {
+	u16 dig[3], id, gpio[6], misc;	/* Cached codec registers */
+	u16 dig_save[3];		/* saved during aux reading */
+	struct wm97xx_codec_drv *codec;	/* attached codec driver*/
+	struct input_dev* input_dev;	/* touchscreen input device */
+	ac97_t *ac97;			/* ALSA codec access */
+	struct device *dev;		/* ALSA device */
+    struct device *battery_dev;
+    struct device *touch_dev;
+    struct wm97xx_mach_ops *mach_ops;
+    struct mutex codec_mutex;
+	struct completion ts_init;
+	struct completion ts_exit;
+	struct task_struct *ts_task;
+	unsigned int pen_irq;	/* Pen IRQ number in use */
+	wait_queue_head_t pen_irq_wait;	/* Pen IRQ wait queue */
+	struct workqueue_struct *pen_irq_workq;
+	struct work_struct pen_event_work;
+	u16 acc_slot; /* AC97 slot used for acc touch data */
+	u16 acc_rate; /* acc touch data rate */
+	unsigned int ts_use_count;
+	unsigned pen_is_down:1;	/* Pen is down */
+	unsigned aux_waiting:1;	/* aux measurement waiting */
+	unsigned pen_probably_down:1;	/* used in polling mode */
+};
+
+/* Codec GPIO access (not supported on WM9705)
+ * This can be used to set/get codec GPIO and Virtual GPIO status.
+ */
+wm97xx_gpio_status_t wm97xx_get_gpio(struct wm97xx *wm, u32 gpio);
+void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
+			  wm97xx_gpio_status_t status);
+void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio,
+				     wm97xx_gpio_dir_t dir,
+				     wm97xx_gpio_pol_t pol,
+				     wm97xx_gpio_sticky_t sticky,
+				     wm97xx_gpio_wake_t wake);
+
+/* codec AC97 IO access */
+int wm97xx_reg_read(struct wm97xx *wm, u16 reg);
+void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val);
+
+/* aux adc readback */
+int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel);
+
+/* machine ops */
+int wm97xx_register_mach_ops(struct wm97xx *, struct wm97xx_mach_ops *);
+void wm97xx_unregister_mach_ops(struct wm97xx *);
+
+extern struct bus_type wm97xx_bus_type;
+#endif