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-rw-r--r--recipes/linux/linux-rp-2.6.24/tosa/0032-Add-chip-driver-for-WM9712-touchscreen.patch492
1 files changed, 492 insertions, 0 deletions
diff --git a/recipes/linux/linux-rp-2.6.24/tosa/0032-Add-chip-driver-for-WM9712-touchscreen.patch b/recipes/linux/linux-rp-2.6.24/tosa/0032-Add-chip-driver-for-WM9712-touchscreen.patch
new file mode 100644
index 0000000000..6265910a1e
--- /dev/null
+++ b/recipes/linux/linux-rp-2.6.24/tosa/0032-Add-chip-driver-for-WM9712-touchscreen.patch
@@ -0,0 +1,492 @@
+From b2640063b8321bdfb324c00d5f0c3366ac31696b Mon Sep 17 00:00:00 2001
+From: Mark Brown <broonie@opensource.wolfsonmicro.com>
+Date: Sat, 26 Jan 2008 21:14:19 +0300
+Subject: [PATCH 32/64] Add chip driver for WM9712 touchscreen
+
+Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
+Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com>
+Signed-off-by: Mike Arthur <mike.arthur@wolfsonmicro.com>
+Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
+Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
+Cc: Stanley Cai <stanley.cai@intel.com>
+Cc: Rodolfo Giometti <giometti@enneenne.com>
+Cc: Russell King <rmk@arm.linux.org.uk>
+Cc: Marc Kleine-Budde <mkl@pengutronix.de>
+Cc: Ian Molton <spyro@f2s.com>
+Cc: Vince Sanders <vince@kyllikki.org>
+Cc: Andrew Zabolotny <zap@homelink.ru>
+---
+ drivers/input/touchscreen/wm9712.c | 461 ++++++++++++++++++++++++++++++++++++
+ 1 files changed, 461 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/input/touchscreen/wm9712.c
+
+diff --git a/drivers/input/touchscreen/wm9712.c b/drivers/input/touchscreen/wm9712.c
+new file mode 100644
+index 0000000..eaab326
+--- /dev/null
++++ b/drivers/input/touchscreen/wm9712.c
+@@ -0,0 +1,461 @@
++/*
++ * 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 "0.61"
++#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)) {
++ 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) {
++ 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");
+--
+1.5.3.8
+
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