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Input: WM97xx - add support for streaming mode on Mainstone
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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>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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Mark Brown authored and Dmitry Torokhov committed Apr 2, 2008
1 parent dca98e9 commit 4db8a5f
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12 changes: 12 additions & 0 deletions drivers/input/touchscreen/Kconfig
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Expand Up @@ -226,6 +226,18 @@ config TOUCHSCREEN_WM9713

If unsure, say N.

config TOUCHSCREEN_WM97XX_MAINSTONE
tristate "WM97xx Mainstone accelerated touch"
depends on TOUCHSCREEN_WM97XX && ARCH_PXA
help
Say Y here for support for streaming mode with WM97xx touchscreens
on Mainstone systems.

If unsure, say N.

To compile this driver as a module, choose M here: the
module will be called mainstone-wm97xx.

config TOUCHSCREEN_USB_COMPOSITE
tristate "USB Touchscreen Driver"
depends on USB_ARCH_HAS_HCD
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1 change: 1 addition & 0 deletions drivers/input/touchscreen/Makefile
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Expand Up @@ -25,3 +25,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
302 changes: 302 additions & 0 deletions drivers/input/touchscreen/mainstone-wm97xx.c
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@@ -0,0 +1,302 @@
/*
* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
* Wolfson WM97xx AC97 Codecs.
*
* Copyright 2004, 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>
*
* 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.
*
* Notes:
* This is a wm97xx extended touch driver to capture touch
* data in a continuous manner on the Intel XScale archictecture
*
* Features:
* - codecs supported:- WM9705, WM9712, WM9713
* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
*
*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/wm97xx.h>
#include <linux/io.h>
#include <asm/arch/pxa-regs.h>

#define VERSION "0.13"

struct continuous {
u16 id; /* codec id */
u8 code; /* continuous code */
u8 reads; /* number of coord reads per read cycle */
u32 speed; /* number of coords per second */
};

#define WM_READS(sp) ((sp / HZ) + 1)

static const struct continuous cinfo[] = {
{WM9705_ID2, 0, WM_READS(94), 94},
{WM9705_ID2, 1, WM_READS(188), 188},
{WM9705_ID2, 2, WM_READS(375), 375},
{WM9705_ID2, 3, WM_READS(750), 750},
{WM9712_ID2, 0, WM_READS(94), 94},
{WM9712_ID2, 1, WM_READS(188), 188},
{WM9712_ID2, 2, WM_READS(375), 375},
{WM9712_ID2, 3, WM_READS(750), 750},
{WM9713_ID2, 0, WM_READS(94), 94},
{WM9713_ID2, 1, WM_READS(120), 120},
{WM9713_ID2, 2, WM_READS(154), 154},
{WM9713_ID2, 3, WM_READS(188), 188},
};

/* continuous speed index */
static int sp_idx;
static u16 last, tries;

/*
* Pen sampling frequency (Hz) in continuous mode.
*/
static int cont_rate = 200;
module_param(cont_rate, int, 0);
MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");

/*
* Pen down detection.
*
* This driver can either poll or use an interrupt to indicate a pen down
* event. If the irq request fails then it will fall back to polling mode.
*/
static int pen_int;
module_param(pen_int, int, 0);
MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");

/*
* Pressure readback.
*
* Set to 1 to read back pen down pressure
*/
static int pressure;
module_param(pressure, int, 0);
MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");

/*
* AC97 touch data slot.
*
* Touch screen readback data ac97 slot
*/
static int ac97_touch_slot = 5;
module_param(ac97_touch_slot, int, 0);
MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");


/* flush AC97 slot 5 FIFO on pxa machines */
#ifdef CONFIG_PXA27x
static void wm97xx_acc_pen_up(struct wm97xx *wm)
{
schedule_timeout_uninterruptible(1);

while (MISR & (1 << 2))
MODR;
}
#else
static void wm97xx_acc_pen_up(struct wm97xx *wm)
{
int count = 16;
schedule_timeout_uninterruptible(1);

while (count < 16) {
MODR;
count--;
}
}
#endif

static int wm97xx_acc_pen_down(struct wm97xx *wm)
{
u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
int reads = 0;

/* When the AC97 queue has been drained we need to allow time
* to buffer up samples otherwise we end up spinning polling
* for samples. The controller can't have a suitably low
* threashold set to use the notifications it gives.
*/
schedule_timeout_uninterruptible(1);

if (tries > 5) {
tries = 0;
return RC_PENUP;
}

x = MODR;
if (x == last) {
tries++;
return RC_AGAIN;
}
last = x;
do {
if (reads)
x = MODR;
y = MODR;
if (pressure)
p = MODR;

/* are samples valid */
if ((x & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_X ||
(y & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_Y ||
(p & WM97XX_ADCSRC_MASK) != WM97XX_ADCSEL_PRES)
goto up;

/* coordinate is good */
tries = 0;
input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
input_sync(wm->input_dev);
reads++;
} while (reads < cinfo[sp_idx].reads);
up:
return RC_PENDOWN | RC_AGAIN;
}

static int wm97xx_acc_startup(struct wm97xx *wm)
{
int idx = 0;

/* check we have a codec */
if (wm->ac97 == NULL)
return -ENODEV;

/* Go you big red fire engine */
for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
if (wm->id != cinfo[idx].id)
continue;
sp_idx = idx;
if (cont_rate <= cinfo[idx].speed)
break;
}
wm->acc_rate = cinfo[sp_idx].code;
wm->acc_slot = ac97_touch_slot;
dev_info(wm->dev,
"mainstone accelerated touchscreen driver, %d samples/sec\n",
cinfo[sp_idx].speed);

/* codec specific irq config */
if (pen_int) {
switch (wm->id) {
case WM9705_ID2:
wm->pen_irq = IRQ_GPIO(4);
set_irq_type(IRQ_GPIO(4), IRQT_BOTHEDGE);
break;
case WM9712_ID2:
case WM9713_ID2:
/* enable pen down interrupt */
/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
wm->pen_irq = MAINSTONE_AC97_IRQ;
wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
WM97XX_GPIO_POL_HIGH,
WM97XX_GPIO_STICKY,
WM97XX_GPIO_WAKE);
wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
WM97XX_GPIO_POL_HIGH,
WM97XX_GPIO_NOTSTICKY,
WM97XX_GPIO_NOWAKE);
break;
default:
dev_err(wm->dev,
"pen down irq not supported on this device\n");
pen_int = 0;
break;
}
}

return 0;
}

static void wm97xx_acc_shutdown(struct wm97xx *wm)
{
/* codec specific deconfig */
if (pen_int) {
switch (wm->id & 0xffff) {
case WM9705_ID2:
wm->pen_irq = 0;
break;
case WM9712_ID2:
case WM9713_ID2:
/* disable interrupt */
wm->pen_irq = 0;
break;
}
}
}

static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
{
if (enable)
enable_irq(wm->pen_irq);
else
disable_irq(wm->pen_irq);
}

static struct wm97xx_mach_ops mainstone_mach_ops = {
.acc_enabled = 1,
.acc_pen_up = wm97xx_acc_pen_up,
.acc_pen_down = wm97xx_acc_pen_down,
.acc_startup = wm97xx_acc_startup,
.acc_shutdown = wm97xx_acc_shutdown,
.irq_enable = wm97xx_irq_enable,
.irq_gpio = WM97XX_GPIO_2,
};

static int mainstone_wm97xx_probe(struct platform_device *pdev)
{
struct wm97xx *wm = platform_get_drvdata(pdev);

return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
}

static int mainstone_wm97xx_remove(struct platform_device *pdev)
{
struct wm97xx *wm = platform_get_drvdata(pdev);

wm97xx_unregister_mach_ops(wm);
return 0;
}

static struct platform_driver mainstone_wm97xx_driver = {
.probe = mainstone_wm97xx_probe,
.remove = mainstone_wm97xx_remove,
.driver = {
.name = "wm97xx-touch",
},
};

static int __init mainstone_wm97xx_init(void)
{
return platform_driver_register(&mainstone_wm97xx_driver);
}

static void __exit mainstone_wm97xx_exit(void)
{
platform_driver_unregister(&mainstone_wm97xx_driver);
}

module_init(mainstone_wm97xx_init);
module_exit(mainstone_wm97xx_exit);

/* Module information */
MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
MODULE_LICENSE("GPL");

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