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From f7dad1cd9c1bd3fce5d228e0b644a51baea50cd9 Mon Sep 17 00:00:00 2001
From: Dmitry Baryshkov <dbaryshkov@gmail.com>
Date: Fri, 15 Feb 2008 15:35:07 +0300
Subject: [PATCH] Preliminary tosa denoiser
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
---
drivers/input/touchscreen/Kconfig | 12 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/tosa-wm97xx.c | 182 +++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/tosa-wm97xx.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 0be05a2..938aed2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -210,6 +210,18 @@ config TOUCHSCREEN_WM97XX_MAINSTONE
To compile this driver as a module, choose M here: the
module will be called mainstone-wm97xx
+config TOUCHSCREEN_WM97XX_TOSA
+ tristate "WM97xx Tosa denoiser"
+ depends on TOUCHSCREEN_WM97XX && MACH_TOSA
+ help
+ Say Y here for support for touchscreen denoising on
+ Sharl Zaurus SL-6000 (tosa) system.
+
+ If unsure, say N
+
+ To compile this driver as a module, choose M here: the
+ module will be called tosa-wm97xx
+
config TOUCHSCREEN_TOUCHWIN
tristate "Touchwin serial touchscreen"
select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index d38156e..d86278b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
+obj-$(CONFIG_TOUCHSCREEN_WM97XX_TOSA) += tosa-wm97xx.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
diff --git a/drivers/input/touchscreen/tosa-wm97xx.c b/drivers/input/touchscreen/tosa-wm97xx.c
new file mode 100644
index 0000000..8fd542b
--- /dev/null
+++ b/drivers/input/touchscreen/tosa-wm97xx.c
@@ -0,0 +1,182 @@
+/*
+ * tosa_ts.c -- Touchscreen driver for Sharp SL-6000 (Tosa).
+ *
+ * Copyright 2008 Dmitry Baryshkov
+ * Copyright 2006 Wolfson Microelectronics PLC.
+ * Author: Mike Arthur
+ * linux@wolfsonmicro.com
+ *
+ * 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.
+ *
+ * Revision history
+ * 1st Sep 2006 Initial version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/wm97xx.h>
+#include <linux/fb.h>
+
+#include <asm/arch/tosa.h>
+#include <asm/gpio.h>
+
+static unsigned long hsync_time = 0;
+
+static void calc_hsync_time(const struct fb_videomode *mode)
+{
+ /* The 25 and 44 'magic numbers' are from Sharp's 2.4 patches */
+ if (mode->yres == 640) {
+ hsync_time = 25;
+ } else if (mode->yres == 320) {
+ hsync_time = 44;
+ } else {
+ printk(KERN_ERR "unknown video mode res specified: %dx%d!", mode->xres, mode->yres);
+ WARN_ON(1);
+ }
+
+ printk(KERN_ERR "tosa-wm97xx: using %lu hsync time\n", hsync_time);
+}
+
+static int fb_notifier_callback(struct notifier_block *self,
+ unsigned long event, void *_data)
+{
+ if (event != FB_EVENT_MODE_CHANGE && event != FB_EVENT_MODE_CHANGE_ALL)
+ return 0;
+
+ calc_hsync_time(tosa_lcd_get_mode());
+
+ return 0;
+}
+
+static void tosa_lcd_wait_hsync(void)
+{
+ /* Waits for a rising edge on the VGA line */
+ while (gpio_get_value(TOSA_GPIO_VGA_LINE) == 0);
+ while (gpio_get_value(TOSA_GPIO_VGA_LINE) != 0);
+}
+
+/* Taken from the Sharp 2.4 kernel code */
+#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
+#define CCNT_ON() asm("mcr p14, 0, %0, C0, C0, 0" : : "r"(1))
+#define CCNT_OFF() asm("mcr p14, 0, %0, C0, C0, 0" : : "r"(0))
+
+/* On the Sharp SL-6000 (Tosa), due to a noisy LCD, we need to perform a wait
+ * before sampling the Y axis of the touchscreen */
+static void tosa_lcd_sync_on(int adcsel)
+{
+ unsigned long timer1 = 0, timer2 = 0, wait_time = 0;
+ if (adcsel & WM97XX_ADCSEL_Y) {
+ CCNT_ON();
+ wait_time = hsync_time;
+
+ if (wait_time) {
+
+ /* wait for LCD rising edge */
+ tosa_lcd_wait_hsync();
+ /* get clock */
+ CCNT(timer1);
+ CCNT(timer2);
+
+ while ((timer2 - timer1) < wait_time) {
+ CCNT(timer2);
+ }
+ }
+ }
+}
+
+static void tosa_lcd_sync_off(int adcsel)
+{
+ if (adcsel & WM97XX_ADCSEL_Y)
+ CCNT_OFF();
+}
+
+static struct wm97xx_mach_ops tosa_mach_ops = {
+ .pre_sample = tosa_lcd_sync_on,
+ .post_sample = tosa_lcd_sync_off,
+};
+
+static int __devinit tosa_ts_probe(struct platform_device *dev) {
+ struct wm97xx *wm = platform_get_drvdata(dev);
+ struct notifier_block *notif;
+ int err = -ENOMEM;
+
+ notif = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
+ if (!notif)
+ goto err_alloc;
+
+ notif->notifier_call = fb_notifier_callback;
+
+ err = gpio_request(TOSA_GPIO_VGA_LINE, "hsync");
+ if (err)
+ goto err_gpio;
+
+ err = gpio_direction_input(TOSA_GPIO_VGA_LINE);
+ if (err)
+ goto err_gpio;
+
+ platform_set_drvdata(dev, notif);
+
+ err = fb_register_client(notif);
+ if (err)
+ goto err_register;
+
+ err = wm97xx_register_mach_ops(wm, &tosa_mach_ops);
+ if (err)
+ goto err_wm97xx;
+
+ calc_hsync_time(tosa_lcd_get_mode());
+
+ return 0;
+
+err_wm97xx:
+ fb_unregister_client(notif);
+err_register:
+ gpio_free(TOSA_GPIO_VGA_LINE);
+err_gpio:
+ kfree(notif);
+err_alloc:
+ return err;
+}
+
+
+static int __devexit tosa_ts_remove(struct platform_device *dev) {
+ struct wm97xx *wm = platform_get_drvdata(dev);
+
+ wm97xx_unregister_mach_ops(wm);
+
+ fb_unregister_client(platform_get_drvdata(dev));
+ gpio_free(TOSA_GPIO_VGA_LINE);
+ kfree(platform_get_drvdata(dev));
+
+ return 0;
+}
+
+static struct platform_driver tosa_ts_driver = {
+ .driver.name = "wm97xx-touch",
+ .driver.owner = THIS_MODULE,
+ .probe = tosa_ts_probe,
+ .remove = __devexit_p(tosa_ts_remove),
+};
+
+static int __init tosa_ts_init(void)
+{
+ return platform_driver_register(&tosa_ts_driver);
+}
+
+static void __exit tosa_ts_exit(void)
+{
+ platform_driver_unregister(&tosa_ts_driver);
+}
+
+module_init(tosa_ts_init);
+module_exit(tosa_ts_exit);
+
+/* Module information */
+MODULE_AUTHOR("Dmitry Baryshkov, Mike Arthur, mike@mikearthur.co.uk, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("Sharp SL6000 Tosa Touch Screen Denoiser");
+MODULE_LICENSE("GPL");
--
1.5.4.1
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