[deliverable/linux.git] / drivers / input / touchscreen / wm9712.c

/*
 * wm9712.c  --  Codec driver for Wolfson WM9712 AC97 Codecs.
 *
 * 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>
 *
 *  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/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		"1.00"
#define DEFAULT_PRESSURE	0xb0c0

/*
 * 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 = 8;
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;
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;
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;
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 wm9712_phy_init(struct wm97xx *wm)
{
	u16 dig1 = 0;
	u16 dig2 = WM97XX_RPR | WM9712_RPU(1);

	/* WM9712 rpu */
	if (rpu) {
		dig2 &= 0xffc0;
		dig2 |= WM9712_RPU(rpu);
		dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms",
			64000 / rpu);
	}

	/* WM9712 five wire */
	if (five_wire) {
		dig2 |= WM9712_45W;
		dev_dbg(wm->dev, "setting 5-wire touchscreen mode.");

		if (pil) {
			dev_warn(wm->dev, "pressure measurement is not "
				 "supported in 5-wire mode\n");
			pil = 0;
		}
	}

	/* touchpanel pressure current*/
	if (pil == 2) {
		dig2 |= WM9712_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 < 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]);

	/* 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 void wm9712_dig_enable(struct wm97xx *wm, int enable)
{
	u16 dig2 = wm->dig[2];

	if (enable) {
		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
				 dig2 | WM97XX_PRP_DET_DIG);
		wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
	} else
		wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
				 dig2 & ~WM97XX_PRP_DET_DIG);
}

static void wm9712_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 wm9712_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] & 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
			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;
}

/*
 * 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_rd = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
		if (!(data_rd & 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
			dev_dbg(wm->dev, "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) || !(data->y & WM97XX_PEN_DOWN)) {
		wm->pen_probably_down = 0;
		return RC_PENUP;
	}
	return RC_VALID;
err:
	return 0;
}

/*
 * Sample the WM9712 touchscreen in polling mode
 */
static int wm9712_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
{
	int rc;

	if (coord) {
		rc = wm9712_poll_coord(wm, data);
		if (rc != RC_VALID)
			return rc;
	} else {
		rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X, &data->x);
		if (rc != RC_VALID)
			return rc;

		rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y);
		if (rc != RC_VALID)
			return rc;

		if (pil && !five_wire) {
			rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES,
						&data->p);
			if (rc != 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) {
		/* continuous mode */
		if (wm->mach_ops->acc_startup) {
			ret = wm->mach_ops->acc_startup(wm);
			if (ret < 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 wm9712_codec = {
	.id = WM9712_ID2,
	.name = "wm9712",
	.poll_sample = wm9712_poll_sample,
	.poll_touch = wm9712_poll_touch,
	.acc_enable = wm9712_acc_enable,
	.phy_init = wm9712_phy_init,
	.dig_enable = wm9712_dig_enable,
	.dig_restore = wm9712_dig_restore,
	.aux_prepare = wm9712_aux_prepare,
};
EXPORT_SYMBOL_GPL(wm9712_codec);

/* Module information */
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
de22b9ef MB	1	/*
	2	* wm9712.c -- Codec driver for Wolfson WM9712 AC97 Codecs.
	3	*
	4	* Copyright 2003, 2004, 2005, 2006, 2007 Wolfson Microelectronics PLC.
b8d055a8	5	* Author: Liam Girdwood <lrg@slimlogic.co.uk>
de22b9ef MB	6	* Parts Copyright : Ian Molton <spyro@f2s.com>
	7	* Andrew Zabolotny <zap@homelink.ru>
	8	* Russell King <rmk@arm.linux.org.uk>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
de22b9ef MB	19	#include <linux/kernel.h>
	20	#include <linux/input.h>
	21	#include <linux/delay.h>
	22	#include <linux/bitops.h>
	23	#include <linux/wm97xx.h>
	24
	25	#define TS_NAME "wm97xx"
	26	#define WM9712_VERSION "1.00"
	27	#define DEFAULT_PRESSURE 0xb0c0
	28
	29	/*
	30	* Module parameters
	31	*/
	32
	33	/*
	34	* Set internal pull up for pen detect.
	35	*
	36	* Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
	37	* i.e. pull up resistance = 64k Ohms / rpu.
	38	*
	39	* Adjust this value if you are having problems with pen detect not
	40	* detecting any down event.
	41	*/
	42	static int rpu = 8;
	43	module_param(rpu, int, 0);
	44	MODULE_PARM_DESC(rpu, "Set internal pull up resitor for pen detect.");
	45
	46	/*
	47	* Set current used for pressure measurement.
	48	*
	49	* Set pil = 2 to use 400uA
	50	* pil = 1 to use 200uA and
	51	* pil = 0 to disable pressure measurement.
	52	*
	53	* This is used to increase the range of values returned by the adc
	54	* when measureing touchpanel pressure.
	55	*/
	56	static int pil;
	57	module_param(pil, int, 0);
	58	MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
	59
	60	/*
	61	* Set threshold for pressure measurement.
	62	*
	63	* Pen down pressure below threshold is ignored.
	64	*/
	65	static int pressure = DEFAULT_PRESSURE & 0xfff;
	66	module_param(pressure, int, 0);
	67	MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
	68
	69	/*
	70	* Set adc sample delay.
	71	*
	72	* For accurate touchpanel measurements, some settling time may be
	73	* required between the switch matrix applying a voltage across the
	74	* touchpanel plate and the ADC sampling the signal.
	75	*
	76	* This delay can be set by setting delay = n, where n is the array
	77	* position of the delay in the array delay_table below.
	78	* Long delays > 1ms are supported for completeness, but are not
	79	* recommended.
	80	*/
	81	static int delay = 3;
	82	module_param(delay, int, 0);
83	MODULE_PARM_DESC(delay, "Set adc sample delay.");
84
85	/*
86	* Set five_wire = 1 to use a 5 wire touchscreen.
87	*
88	* NOTE: Five wire mode does not allow for readback of pressure.
89	*/
90	static int five_wire;
91	module_param(five_wire, int, 0);
92	MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
93
94	/*
95	* Set adc mask function.
96	*
97	* Sources of glitch noise, such as signals driving an LCD display, may feed
98	* through to the touch screen plates and affect measurement accuracy. In
99	* order to minimise this, a signal may be applied to the MASK pin to delay or
100	* synchronise the sampling.
101	*
102	* 0 = No delay or sync
103	* 1 = High on pin stops conversions
104	* 2 = Edge triggered, edge on pin delays conversion by delay param (above)
105	* 3 = Edge triggered, edge on pin starts conversion after delay param
106	*/
107	static int mask;
108	module_param(mask, int, 0);
109	MODULE_PARM_DESC(mask, "Set adc mask function.");
110
111	/*
112	* Coordinate Polling Enable.
113	*
114	* Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
115	* for every poll.
116	*/
117	static int coord;
118	module_param(coord, int, 0);
119	MODULE_PARM_DESC(coord, "Polling coordinate mode");
120
121	/*
122	* ADC sample delay times in uS
123	*/
124	static const int delay_table[] = {
125	21, /* 1 AC97 Link frames */
126	42, /* 2 */
127	84, /* 4 */
128	167, /* 8 */
129	333, /* 16 */
130	667, /* 32 */
131	1000, /* 48 */
132	1333, /* 64 */
133	2000, /* 96 */
134	2667, /* 128 */
135	3333, /* 160 */
136	4000, /* 192 */
137	4667, /* 224 */
138	5333, /* 256 */
139	6000, /* 288 */
140	0 /* No delay, switch matrix always on */
141	};
142
143	/*
144	* Delay after issuing a POLL command.
145	*
146	* The delay is 3 AC97 link frames + the touchpanel settling delay
147	*/
148	static inline void poll_delay(int d)
149	{
150	udelay(3 * AC97_LINK_FRAME + delay_table[d]);
151	}
152
153	/*
154	* set up the physical settings of the WM9712
155	*/
156	static void wm9712_phy_init(struct wm97xx *wm)
157	{
158	u16 dig1 = 0;
159	u16 dig2 = WM97XX_RPR \| WM9712_RPU(1);
160
161	/* WM9712 rpu */
162	if (rpu) {
163	dig2 &= 0xffc0;
164	dig2 \|= WM9712_RPU(rpu);
165	dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms",
166	64000 / rpu);
167	}
168
8a65c02f MB	169	/* WM9712 five wire */
	170	if (five_wire) {
	171	dig2 \|= WM9712_45W;
	172	dev_dbg(wm->dev, "setting 5-wire touchscreen mode.");
	173
	174	if (pil) {
	175	dev_warn(wm->dev, "pressure measurement is not "
	176	"supported in 5-wire mode\n");
	177	pil = 0;
	178	}
	179	}
	180
de22b9ef MB	181	/* touchpanel pressure current*/
	182	if (pil == 2) {
	183	dig2 \|= WM9712_PIL;
	184	dev_dbg(wm->dev,
	185	"setting pressure measurement current to 400uA.");
	186	} else if (pil)
	187	dev_dbg(wm->dev,
	188	"setting pressure measurement current to 200uA.");
	189	if (!pil)
	190	pressure = 0;
	191
de22b9ef MB	192	/* polling mode sample settling delay */
	193	if (delay < 0 \|\| delay > 15) {
	194	dev_dbg(wm->dev, "supplied delay out of range.");
	195	delay = 4;
	196	}
	197	dig1 &= 0xff0f;
	198	dig1 \|= WM97XX_DELAY(delay);
	199	dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",
	200	delay_table[delay]);
	201
	202	/* mask */
	203	dig2 \|= ((mask & 0x3) << 6);
	204	if (mask) {
	205	u16 reg;
	206	/* Set GPIO4 as Mask Pin*/
	207	reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
	208	wm97xx_reg_write(wm, AC97_MISC_AFE, reg \| WM97XX_GPIO_4);
	209	reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
	210	wm97xx_reg_write(wm, AC97_GPIO_CFG, reg \| WM97XX_GPIO_4);
	211	}
	212
	213	/* wait - coord mode */
	214	if (coord)
	215	dig2 \|= WM9712_WAIT;
	216
	217	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
	218	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
	219	}
	220
	221	static void wm9712_dig_enable(struct wm97xx *wm, int enable)
	222	{
	223	u16 dig2 = wm->dig[2];
	224
	225	if (enable) {
	226	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
	227	dig2 \| WM97XX_PRP_DET_DIG);
	228	wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
	229	} else
	230	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
	231	dig2 & ~WM97XX_PRP_DET_DIG);
	232	}
	233
	234	static void wm9712_aux_prepare(struct wm97xx *wm)
	235	{
	236	memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
	237	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
	238	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
	239	}
	240
	241	static void wm9712_dig_restore(struct wm97xx *wm)
	242	{
	243	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
	244	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
	245	}
	246
	247	static inline int is_pden(struct wm97xx *wm)
	248	{
	249	return wm->dig[2] & WM9712_PDEN;
	250	}
	251
	252	/*
	253	* Read a sample from the WM9712 adc in polling mode.
	254	*/
	255	static int wm9712_poll_sample(struct wm97xx wm, int adcsel, int sample)
256	{
257	int timeout = 5 * delay;
258
259	if (!wm->pen_probably_down) {
260	u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
261	if (!(data & WM97XX_PEN_DOWN))
262	return RC_PENUP;
263	wm->pen_probably_down = 1;
264	}
265
266	/* set up digitiser */
267	if (adcsel & 0x8000)
268	adcsel = ((adcsel & 0x7fff) + 3) << 12;
269
270	if (wm->mach_ops && wm->mach_ops->pre_sample)
271	wm->mach_ops->pre_sample(adcsel);
272	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1,
273	adcsel \| WM97XX_POLL \| WM97XX_DELAY(delay));
274
275	/* wait 3 AC97 time slots + delay for conversion */
276	poll_delay(delay);
277
278	/* wait for POLL to go low */
279	while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
280	&& timeout) {
281	udelay(AC97_LINK_FRAME);
282	timeout--;
283	}
284
285	if (timeout <= 0) {
286	/* If PDEN is set, we can get a timeout when pen goes up */
287	if (is_pden(wm))
288	wm->pen_probably_down = 0;
289	else
290	dev_dbg(wm->dev, "adc sample timeout");
291	return RC_PENUP;
292	}
293
294	*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
295	if (wm->mach_ops && wm->mach_ops->post_sample)
296	wm->mach_ops->post_sample(adcsel);
297
298	/* check we have correct sample */
299	if ((*sample & WM97XX_ADCSEL_MASK) != adcsel) {
300	dev_dbg(wm->dev, "adc wrong sample, read %x got %x", adcsel,
301	*sample & WM97XX_ADCSEL_MASK);
302	return RC_PENUP;
303	}
304
305	if (!(*sample & WM97XX_PEN_DOWN)) {
306	wm->pen_probably_down = 0;
307	return RC_PENUP;
308	}
309
310	return RC_VALID;
311	}
312
313	/*
314	* Read a coord from the WM9712 adc in polling mode.
315	*/
316	static int wm9712_poll_coord(struct wm97xx wm, struct wm97xx_data data)
317	{
318	int timeout = 5 * delay;
319
320	if (!wm->pen_probably_down) {
321	u16 data_rd = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
322	if (!(data_rd & WM97XX_PEN_DOWN))
323	return RC_PENUP;
324	wm->pen_probably_down = 1;
325	}
326
327	/* set up digitiser */
328	if (wm->mach_ops && wm->mach_ops->pre_sample)
329	wm->mach_ops->pre_sample(WM97XX_ADCSEL_X \| WM97XX_ADCSEL_Y);
330
331	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1,
332	WM97XX_COO \| WM97XX_POLL \| WM97XX_DELAY(delay));
333
334	/* wait 3 AC97 time slots + delay for conversion and read x */
335	poll_delay(delay);
336	data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
337	/* wait for POLL to go low */
338	while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
339	&& timeout) {
340	udelay(AC97_LINK_FRAME);
341	timeout--;
342	}
343
344	if (timeout <= 0) {
345	/* If PDEN is set, we can get a timeout when pen goes up */
346	if (is_pden(wm))
347	wm->pen_probably_down = 0;
348	else
349	dev_dbg(wm->dev, "adc sample timeout");
350	return RC_PENUP;
351	}
352
353	/* read back y data */
354	data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
355	if (pil)
356	data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
357	else
358	data->p = DEFAULT_PRESSURE;
359
360	if (wm->mach_ops && wm->mach_ops->post_sample)
361	wm->mach_ops->post_sample(WM97XX_ADCSEL_X \| WM97XX_ADCSEL_Y);
362
363	/* check we have correct sample */
364	if (!(data->x & WM97XX_ADCSEL_X) \|\| !(data->y & WM97XX_ADCSEL_Y))
365	goto err;
366	if (pil && !(data->p & WM97XX_ADCSEL_PRES))
367	goto err;
368
369	if (!(data->x & WM97XX_PEN_DOWN) \|\| !(data->y & WM97XX_PEN_DOWN)) {
370	wm->pen_probably_down = 0;
371	return RC_PENUP;
372	}
373	return RC_VALID;
374	err:
375	return 0;
376	}
377
378	/*
379	* Sample the WM9712 touchscreen in polling mode
380	*/
381	static int wm9712_poll_touch(struct wm97xx wm, struct wm97xx_data data)
382	{
383	int rc;
384
385	if (coord) {
386	rc = wm9712_poll_coord(wm, data);
387	if (rc != RC_VALID)
388	return rc;
389	} else {
390	rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X, &data->x);
391	if (rc != RC_VALID)
392	return rc;
393
394	rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y);
395	if (rc != RC_VALID)
396	return rc;
397
398	if (pil && !five_wire) {
399	rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES,
400	&data->p);
401	if (rc != RC_VALID)
402	return rc;
403	} else
404	data->p = DEFAULT_PRESSURE;
405	}
406	return RC_VALID;
407	}
408
409	/*
410	* Enable WM9712 continuous mode, i.e. touch data is streamed across
411	* an AC97 slot
412	*/
413	static int wm9712_acc_enable(struct wm97xx *wm, int enable)
414	{
415	u16 dig1, dig2;
416	int ret = 0;
417
418	dig1 = wm->dig[1];
419	dig2 = wm->dig[2];
420
421	if (enable) {
25985edc	422	/* continuous mode */
de22b9ef MB	423	if (wm->mach_ops->acc_startup) {
	424	ret = wm->mach_ops->acc_startup(wm);
	425	if (ret < 0)
	426	return ret;
	427	}
	428	dig1 &= ~(WM97XX_CM_RATE_MASK \| WM97XX_ADCSEL_MASK \|
	429	WM97XX_DELAY_MASK \| WM97XX_SLT_MASK);
	430	dig1 \|= WM97XX_CTC \| WM97XX_COO \| WM97XX_SLEN \|
	431	WM97XX_DELAY(delay) \|
	432	WM97XX_SLT(wm->acc_slot) \|
	433	WM97XX_RATE(wm->acc_rate);
	434	if (pil)
	435	dig1 \|= WM97XX_ADCSEL_PRES;
	436	dig2 \|= WM9712_PDEN;
	437	} else {
	438	dig1 &= ~(WM97XX_CTC \| WM97XX_COO \| WM97XX_SLEN);
	439	dig2 &= ~WM9712_PDEN;
	440	if (wm->mach_ops->acc_shutdown)
	441	wm->mach_ops->acc_shutdown(wm);
	442	}
	443
	444	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
	445	wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
	446
	447	return 0;
	448	}
	449
	450	struct wm97xx_codec_drv wm9712_codec = {
	451	.id = WM9712_ID2,
	452	.name = "wm9712",
	453	.poll_sample = wm9712_poll_sample,
	454	.poll_touch = wm9712_poll_touch,
	455	.acc_enable = wm9712_acc_enable,
	456	.phy_init = wm9712_phy_init,
	457	.dig_enable = wm9712_dig_enable,
	458	.dig_restore = wm9712_dig_restore,
	459	.aux_prepare = wm9712_aux_prepare,
	460	};
	461	EXPORT_SYMBOL_GPL(wm9712_codec);
	462
	463	/* Module information */
b8d055a8	464	MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
de22b9ef MB	465	MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
de22b9ef MB	466	MODULE_LICENSE("GPL");