Input: WM97xx - add support for streaming mode on Mainstone
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>
This commit is contained in:
Mark Brown
Dmitry Torokhov
parent
dca98e91fb
commit
4db8a5f21e
@ -226,6 +226,18 @@ config TOUCHSCREEN_WM9713
|
|||||||
|
|
||||||
If unsure, say N.
|
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
|
config TOUCHSCREEN_USB_COMPOSITE
|
||||||
tristate "USB Touchscreen Driver"
|
tristate "USB Touchscreen Driver"
|
||||||
depends on USB_ARCH_HAS_HCD
|
depends on USB_ARCH_HAS_HCD
|
||||||
|
|||||||
@ -25,3 +25,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
|
|||||||
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
|
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
|
||||||
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
|
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
|
||||||
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
|
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
|
||||||
|
obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
|
||||||
|
|||||||
302
drivers/input/touchscreen/mainstone-wm97xx.c
Normal file
302
drivers/input/touchscreen/mainstone-wm97xx.c
Normal file
@ -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");
|
||||||
Loading…
Reference in New Issue
Block a user