diff options
Diffstat (limited to 'recipes/linux/linux-rp-2.6.24/tosa/0031-Add-chip-driver-for-WM9705-touchscreen.patch')
| -rw-r--r-- | recipes/linux/linux-rp-2.6.24/tosa/0031-Add-chip-driver-for-WM9705-touchscreen.patch | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/recipes/linux/linux-rp-2.6.24/tosa/0031-Add-chip-driver-for-WM9705-touchscreen.patch b/recipes/linux/linux-rp-2.6.24/tosa/0031-Add-chip-driver-for-WM9705-touchscreen.patch new file mode 100644 index 0000000000..3890795f61 --- /dev/null +++ b/recipes/linux/linux-rp-2.6.24/tosa/0031-Add-chip-driver-for-WM9705-touchscreen.patch @@ -0,0 +1,383 @@ +From 7b366ca784d0540613a43908de803e4dedc100d3 Mon Sep 17 00:00:00 2001 +From: Mark Brown <broonie@opensource.wolfsonmicro.com> +Date: Sat, 26 Jan 2008 21:14:20 +0300 +Subject: [PATCH 31/64] Add chip driver for WM9705 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/wm9705.c | 352 ++++++++++++++++++++++++++++++++++++ + 1 files changed, 352 insertions(+), 0 deletions(-) + create mode 100644 drivers/input/touchscreen/wm9705.c + +diff --git a/drivers/input/touchscreen/wm9705.c b/drivers/input/touchscreen/wm9705.c +new file mode 100644 +index 0000000..f185104 +--- /dev/null ++++ b/drivers/input/touchscreen/wm9705.c +@@ -0,0 +1,352 @@ ++/* ++ * 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 "0.62" ++#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"); +-- +1.5.3.8 + |