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linux/drivers/input/touchscreen/mainstone-wm97xx.c
Marek Vasut 99fde513f5 Input: wm97xx - add possibility to control the GPIO_STATUS shift 
This patch allows tweaking the behaviour of GPIO_STATUS register
shift quirk that's in wm97xx-core. The problem with GPIO_STATUS
register being shifted by one doesn't appear on all hardware it
seems and causes problems with accelerated touchscreen drivers on
Palm hardware. Therefore an accelerated touchscreen driver can select
if the shift is/isn't happening on the hardware.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-07-20 22:30:33 -07:00

320 lines
7.7 KiB
C
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/*
* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
* Wolfson WM97xx AC97 Codecs.
*
* Copyright 2004, 2007 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
* 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/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 <linux/gpio.h>
#include <mach/regs-ac97.h>
#include <asm/mach-types.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[] = {
{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;
static int irq;
/*
* 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)
{
unsigned int count;
schedule_timeout_uninterruptible(1);
for (count = 0; count < 16; count++)
MODR;
}
#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_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 = 0, ret = 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);
/* IRQ driven touchscreen is used on Palm hardware */
if (machine_is_palmt5() || machine_is_palmtx() || machine_is_palmld()) {
pen_int = 1;
irq = 27;
/* There is some obscure mutant of WM9712 interbred with WM9713
* used on Palm HW */
wm->variant = WM97xx_WM1613;
} else if (machine_is_mainstone() && pen_int)
irq = 4;
if (irq) {
ret = gpio_request(irq, "Touchscreen IRQ");
if (ret)
goto out;
ret = gpio_direction_input(irq);
if (ret) {
gpio_free(irq);
goto out;
}
wm->pen_irq = gpio_to_irq(irq);
set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
} else /* pen irq not supported */
pen_int = 0;
/* codec specific irq config */
if (pen_int) {
switch (wm->id) {
case WM9705_ID2:
break;
case WM9712_ID2:
case WM9713_ID2:
/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
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;
}
}
out:
return ret;
}
static void wm97xx_acc_shutdown(struct wm97xx *wm)
{
/* codec specific deconfig */
if (pen_int) {
if (irq)
gpio_free(irq);
wm->pen_irq = 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 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 <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
MODULE_LICENSE("GPL");
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