Input: WM97xx - add chip driver for WM9712 touchscreen (de22b9ef) · Commits · e / devices / android_kernel_sony_msm8998

drivers/input/touchscreen/Kconfig

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		@@ -208,6 +208,15 @@ config TOUCHSCREEN_WM9705

		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_USB_COMPOSITE
		tristate "USB Touchscreen Driver"
		depends on USB_ARCH_HAS_HCD

drivers/input/touchscreen/Makefile

+1 −0

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		@@ -23,3 +23,4 @@ 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

drivers/input/touchscreen/wm9712.c

0 → 100644

+462 −0

Original line number	Diff line number	Diff line
		/*
		* wm9712.c -- Codec driver for Wolfson WM9712 AC97 Codecs.
		*
		* 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 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);
		}

		/* 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;

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

		/* 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) {
		/* continous 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 <liam.girdwood@wolfsonmicro.com>");
		MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
		MODULE_LICENSE("GPL");