Orange Pi5 kernel

 // SPDX-License-Identifier: GPL-2.0-or-later
/*
 * wm9705.c  --  Codec driver for Wolfson WM9705 AC97 Codec.
 *
 * Copyright 2003, 2004, 2005, 2006, 2007 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 * Parts Copyright : Ian Molton <spyro@f2s.com>
 *                   Andrew Zabolotny <zap@homelink.ru>
 *                   Russell King <rmk@arm.linux.org.uk>
 */
 
#include <linux/module.h>
#include <linux/moduleparam.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;
<------>bool wants_pen = adcsel & WM97XX_PEN_DOWN;
 
<------>if (wants_pen && !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(adcsel);
<------>wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, (adcsel & WM97XX_ADCSEL_MASK)
<------><------><------><------>| 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 ^ adcsel) & WM97XX_ADCSEL_MASK) {
<------><------>dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
<------><------><------>adcsel & WM97XX_ADCSEL_MASK,
<------><------><------>*sample & WM97XX_ADCSEL_MASK);
<------><------>return RC_PENUP;
<------>}
 
<------>if (wants_pen && !(*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 | WM97XX_PEN_DOWN, &data->x);
<------>if (rc != RC_VALID)
<------><------>return rc;
<------>rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
<------>if (rc != RC_VALID)
<------><------>return rc;
<------>if (pil) {
<------><------>rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN, &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) {
<------><------>/* continuous 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 <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("WM9705 Touch Screen Driver");
MODULE_LICENSE("GPL");

	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* wm9705.c -- Codec driver for Wolfson WM9705 AC97 Codec.
	*
	* Copyright 2003, 2004, 2005, 2006, 2007 Wolfson Microelectronics PLC.
	* Author: Liam Girdwood <lrg@slimlogic.co.uk>
	* Parts Copyright : Ian Molton <spyro@f2s.com>
	* Andrew Zabolotny <zap@homelink.ru>
	* Russell King <rmk@arm.linux.org.uk>
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.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;
	<------>bool wants_pen = adcsel & WM97XX_PEN_DOWN;

	<------>if (wants_pen && !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(adcsel);
	<------>wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, (adcsel & WM97XX_ADCSEL_MASK)
	<------><------><------><------>\| 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 ^ adcsel) & WM97XX_ADCSEL_MASK) {
	<------><------>dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
	<------><------><------>adcsel & WM97XX_ADCSEL_MASK,
	<------><------><------>*sample & WM97XX_ADCSEL_MASK);
	<------><------>return RC_PENUP;
	<------>}

	<------>if (wants_pen && !(*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 \| WM97XX_PEN_DOWN, &data->x);
	<------>if (rc != RC_VALID)
	<------><------>return rc;
	<------>rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y \| WM97XX_PEN_DOWN, &data->y);
	<------>if (rc != RC_VALID)
	<------><------>return rc;
	<------>if (pil) {
	<------><------>rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_PRES \| WM97XX_PEN_DOWN, &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) {
	<------><------>/* continuous 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 <lrg@slimlogic.co.uk>");
	MODULE_DESCRIPTION("WM9705 Touch Screen Driver");
	MODULE_LICENSE("GPL");