Merge branch 'wm97xx'

MAINTAINERS

@@ -4343,6 +4343,16 @@ L:	linux-wireless@vger.kernel.org
 W:	http://oops.ghostprotocols.net:81/blog
 S:	Maintained
 
+WM97XX TOUCHSCREEN DRIVERS
+P:	Mark Brown
+M:	broonie@opensource.wolfsonmicro.com
+P:	Liam Girdwood
+M:	liam.girdwood@wolfsonmicro.com
+L:	linux-input@vger.kernel.org
+T:	git git://opensource.wolfsonmicro.com/linux-2.6-touch
+W:	http://opensource.wolfsonmicro.com/node/7
+S:	Supported
+
 X.25 NETWORK LAYER
 P:	Henner Eisen
 M:	eis@baty.hanse.de

drivers/input/touchscreen/Kconfig

@@ -185,6 +185,59 @@ config TOUCHSCREEN_UCB1400
 	  To compile this driver as a module, choose M here: the
 	  module will be called ucb1400_ts.
 
+config TOUCHSCREEN_WM97XX
+	tristate "Support for WM97xx AC97 touchscreen controllers"
+	depends on AC97_BUS
+	help
+	  Say Y here if you have a Wolfson Microelectronics WM97xx
+	  touchscreen connected to your system. Note that this option
+	  only enables core driver, you will also need to select
+	  support for appropriate chip below.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called wm97xx-ts.
+
+config TOUCHSCREEN_WM9705
+	bool "WM9705 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have a Wolfson Microelectronics WM9705
+	  touchscreen controller connected to your system.
+
+	  If unsure, say N.
+
+config TOUCHSCREEN_WM9712
+	bool "WM9712 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have a Wolfson Microelectronics WM9712
+	  touchscreen controller connected to your system.
+
+	  If unsure, say N.
+
+config TOUCHSCREEN_WM9713
+	bool "WM9713 Touchscreen interface support"
+	depends on TOUCHSCREEN_WM97XX
+	help
+	  Say Y here if you have a Wolfson Microelectronics WM9713 touchscreen
+	  controller connected to your system.
+
+	  If unsure, say N.
+
+config TOUCHSCREEN_WM97XX_MAINSTONE
+	tristate "WM97xx Mainstone accelerated touch"
+	depends on TOUCHSCREEN_WM97XX && ARCH_PXA
+	help
+	  Say Y here for support for streaming mode with WM97xx touchscreens
+	  on Mainstone systems.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mainstone-wm97xx.
+
 config TOUCHSCREEN_USB_COMPOSITE
 	tristate "USB Touchscreen Driver"
 	depends on USB_ARCH_HAS_HCD

drivers/input/touchscreen/Makefile

@@ -4,6 +4,8 @@
 
 # Each configuration option enables a list of files.
 
+wm97xx-ts-y := wm97xx-core.o
+
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)		+= h3600_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_CORGI)		+= corgi_ts.o
@@ -19,3 +21,8 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= penmount.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o
+obj-$(CONFIG_TOUCHSCREEN_WM97XX)	+= wm97xx-ts.o
+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

drivers/input/touchscreen/mainstone-wm97xx.c

+/*
+ * mainstone-wm97xx.c  --  Mainstone Continuous Touch screen driver for
+ *                         Wolfson WM97xx AC97 Codecs.
+ *
+ * Copyright 2004, 2007 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
+ *
+ */
+
+#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/interrupt.h>
+#include <linux/wm97xx.h>
+#include <linux/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;
+static u16 last, tries;
+
+/*
+ * 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;
+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;
+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
+static void wm97xx_acc_pen_up(struct wm97xx *wm)
+{
+	schedule_timeout_uninterruptible(1);
+
+	while (MISR & (1 << 2))
+		MODR;
+}
+#else
+static void wm97xx_acc_pen_up(struct wm97xx *wm)
+{
+	int count = 16;
+	schedule_timeout_uninterruptible(1);
+
+	while (count < 16) {
+		MODR;
+		count--;
+	}
+}
+#endif
+
+static int wm97xx_acc_pen_down(struct wm97xx *wm)
+{
+	u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
+	int reads = 0;
+
+	/* 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.
+	 */
+	schedule_timeout_uninterruptible(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_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 = 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;
+	dev_info(wm->dev,
+		 "mainstone 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:
+			dev_err(wm->dev,
+				"pen down irq not supported on this device\n");
+			pen_int = 0;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static 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 void wm97xx_irq_enable(struct wm97xx *wm, int enable)
+{
+	if (enable)
+		enable_irq(wm->pen_irq);
+	else
+		disable_irq(wm->pen_irq);
+}
+
+static struct wm97xx_mach_ops mainstone_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,
+	.irq_enable = wm97xx_irq_enable,
+	.irq_gpio = WM97XX_GPIO_2,
+};
+
+static int mainstone_wm97xx_probe(struct platform_device *pdev)
+{
+	struct wm97xx *wm = platform_get_drvdata(pdev);
+
+	return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
+}
+
+static int mainstone_wm97xx_remove(struct platform_device *pdev)
+{
+	struct wm97xx *wm = platform_get_drvdata(pdev);
+
+	wm97xx_unregister_mach_ops(wm);
+	return 0;
+}
+
+static struct platform_driver mainstone_wm97xx_driver = {
+	.probe = mainstone_wm97xx_probe,
+	.remove = mainstone_wm97xx_remove,
+	.driver = {
+		.name = "wm97xx-touch",
+	},
+};
+
+static int __init mainstone_wm97xx_init(void)
+{
+	return platform_driver_register(&mainstone_wm97xx_driver);
+}
+
+static void __exit mainstone_wm97xx_exit(void)
+{
+	platform_driver_unregister(&mainstone_wm97xx_driver);
+}
+
+module_init(mainstone_wm97xx_init);
+module_exit(mainstone_wm97xx_exit);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
+MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
+MODULE_LICENSE("GPL");

drivers/input/touchscreen/wm9705.c

+/*
+ * wm9705.c  --  Codec driver for Wolfson WM9705 AC97 Codec.
+ *
+ * Copyright 2003, 2004, 2005, 2006, 2007 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.
+ *
+ */
+
+#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		"1.00"
+#define DEFAULT_PRESSURE	0xb0c0
+
+/*
+ * 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;
+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;
+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 wm9705_phy_init(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;
+		dev_dbg(wm->dev,
+			"setting pressure measurement current to 400uA.");
+	} else if (pil)
+		dev_dbg(wm->dev,
+			"setting pressure measurement current to 200uA.");
+	if (!pil)
+		pressure = 0;
+
+	/* polling mode sample settling delay */
+	if (delay != 4) {
+		if (delay < 0 || delay > 15) {
+			dev_dbg(wm->dev, "supplied delay out of range.");
+			delay = 4;
+		}
+	}
+	dig1 &= 0xff0f;
+	dig1 |= WM97XX_DELAY(delay);
+	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",
+		delay_table[delay]);
+
+	/* WM9705 pdd */
+	dig2 |= (pdd & 0x000f);
+	dev_dbg(wm->dev, "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 void wm9705_dig_enable(struct wm97xx *wm, int enable)
+{
+	if (enable) {
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
+				 wm->dig[2] | WM97XX_PRP_DET_DIG);
+		wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
+	} else
+		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
+				 wm->dig[2] & ~WM97XX_PRP_DET_DIG);
+}
+
+static void wm9705_aux_prepare(struct wm97xx *wm)
+{
+	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);
+}
+
+static void wm9705_dig_restore(struct wm97xx *wm)
+{
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
+	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
+}
+
+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
+			dev_dbg(wm->dev, "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) {
+		dev_dbg(wm->dev, "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;
+
+	rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_X, &data->x);
+	if (rc != RC_VALID)
+		return rc;
+	rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y);
+	if (rc != RC_VALID)
+		return rc;
+	if (pil) {
+		rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_PRES, &data->p);
+		if (rc != 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 wm9705_codec = {
+	.id = WM9705_ID2,
+	.name = "wm9705",
+	.poll_sample = wm9705_poll_sample,
+	.poll_touch = wm9705_poll_touch,
+	.acc_enable = wm9705_acc_enable,
+	.phy_init = wm9705_phy_init,
+	.dig_enable = wm9705_dig_enable,
+	.dig_restore = wm9705_dig_restore,
+	.aux_prepare = wm9705_aux_prepare,
+};
+EXPORT_SYMBOL_GPL(wm9705_codec);
+
+/* Module information */
+MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM9705 Touch Screen Driver");
+MODULE_LICENSE("GPL");