Input: add accelerated touchscreen support for Marvell Zylonite
This patch implements accelerated touchscreen support for the Marvell Zylonite development platform, supporting pen down interrupts and continuous mode data transfers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Mark Brown
Dmitry Torokhov
parent
cd2d64b1a0
commit
22e39d344f
3 changed files with 254 additions and 0 deletions
|
|
@ -308,6 +308,19 @@ config TOUCHSCREEN_WM97XX_MAINSTONE
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called mainstone-wm97xx.
|
||||
|
||||
config TOUCHSCREEN_WM97XX_ZYLONITE
|
||||
tristate "Zylonite accelerated touch"
|
||||
depends on TOUCHSCREEN_WM97XX && MACH_ZYLONITE
|
||||
select TOUCHSCREEN_WM9713
|
||||
help
|
||||
Say Y here for support for streaming mode with the touchscreen
|
||||
on Zylonite systems.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called zylonite-wm97xx.
|
||||
|
||||
config TOUCHSCREEN_USB_COMPOSITE
|
||||
tristate "USB Touchscreen Driver"
|
||||
depends on USB_ARCH_HAS_HCD
|
||||
|
|
|
|||
|
|
@ -34,3 +34,4 @@ 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
|
||||
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
|
||||
|
|
|
|||
240
drivers/input/touchscreen/zylonite-wm97xx.c
Normal file
240
drivers/input/touchscreen/zylonite-wm97xx.c
Normal file
|
|
@ -0,0 +1,240 @@
|
|||
/*
|
||||
* zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver
|
||||
*
|
||||
* Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC.
|
||||
* Author: Mark Brown <broonie@opensource.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 supporting interrupt driven
|
||||
* and continuous operation on Marvell Zylonite development systems
|
||||
* (which have a WM9713 on board).
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/wm97xx.h>
|
||||
|
||||
#include <mach/hardware.h>
|
||||
#include <mach/mfp.h>
|
||||
#include <mach/regs-ac97.h>
|
||||
|
||||
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[] = {
|
||||
{ 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;
|
||||
|
||||
/*
|
||||
* 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)");
|
||||
|
||||
/*
|
||||
* 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 machines */
|
||||
static void wm97xx_acc_pen_up(struct wm97xx *wm)
|
||||
{
|
||||
int i;
|
||||
|
||||
msleep(1);
|
||||
|
||||
for (i = 0; i < 16; i++)
|
||||
MODR;
|
||||
}
|
||||
|
||||
static int wm97xx_acc_pen_down(struct wm97xx *wm)
|
||||
{
|
||||
u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
|
||||
int reads = 0;
|
||||
static u16 last, tries;
|
||||
|
||||
/* 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.
|
||||
*/
|
||||
msleep(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_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
|
||||
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;
|
||||
|
||||
/* 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,
|
||||
"zylonite accelerated touchscreen driver, %d samples/sec\n",
|
||||
cinfo[sp_idx].speed);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
|
||||
{
|
||||
if (enable)
|
||||
enable_irq(wm->pen_irq);
|
||||
else
|
||||
disable_irq_nosync(wm->pen_irq);
|
||||
}
|
||||
|
||||
static struct wm97xx_mach_ops zylonite_mach_ops = {
|
||||
.acc_enabled = 1,
|
||||
.acc_pen_up = wm97xx_acc_pen_up,
|
||||
.acc_pen_down = wm97xx_acc_pen_down,
|
||||
.acc_startup = wm97xx_acc_startup,
|
||||
.irq_enable = wm97xx_irq_enable,
|
||||
.irq_gpio = WM97XX_GPIO_2,
|
||||
};
|
||||
|
||||
static int zylonite_wm97xx_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct wm97xx *wm = platform_get_drvdata(pdev);
|
||||
int gpio_touch_irq;
|
||||
|
||||
if (cpu_is_pxa320())
|
||||
gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15);
|
||||
else
|
||||
gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26);
|
||||
|
||||
wm->pen_irq = IRQ_GPIO(gpio_touch_irq);
|
||||
set_irq_type(IRQ_GPIO(gpio_touch_irq), IRQ_TYPE_EDGE_BOTH);
|
||||
|
||||
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);
|
||||
|
||||
return wm97xx_register_mach_ops(wm, &zylonite_mach_ops);
|
||||
}
|
||||
|
||||
static int zylonite_wm97xx_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct wm97xx *wm = platform_get_drvdata(pdev);
|
||||
|
||||
wm97xx_unregister_mach_ops(wm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver zylonite_wm97xx_driver = {
|
||||
.probe = zylonite_wm97xx_probe,
|
||||
.remove = zylonite_wm97xx_remove,
|
||||
.driver = {
|
||||
.name = "wm97xx-touch",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init zylonite_wm97xx_init(void)
|
||||
{
|
||||
return platform_driver_register(&zylonite_wm97xx_driver);
|
||||
}
|
||||
|
||||
static void __exit zylonite_wm97xx_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&zylonite_wm97xx_driver);
|
||||
}
|
||||
|
||||
module_init(zylonite_wm97xx_init);
|
||||
module_exit(zylonite_wm97xx_exit);
|
||||
|
||||
/* Module information */
|
||||
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
||||
MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in a new issue