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From 564b757ba44b517ac6d693b94a177708bb5d3887 Mon Sep 17 00:00:00 2001
From: Dmitry Baryshkov <dbaryshkov@gmail.com>
Date: Fri, 19 Oct 2007 17:30:30 +0400
Subject: [PATCH] tosa-lcdnoise-r1.patch
---
drivers/input/touchscreen/Kconfig | 13 +++++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/tosa_ts.c | 102 +++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 3ac01b4..6862e8f 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -219,6 +219,19 @@ config TOUCHSCREEN_USB_DMC_TSC10
bool "DMC TSC-10/25 device support" if EMBEDDED
depends on TOUCHSCREEN_USB_COMPOSITE
+config TOUCHSCREEN_TOSA
+ tristate "Sharp Tosa touchscreen driver"
+ depends on TOUCHSCREEN_WM97XX && MACH_TOSA
+ default n
+ help
+ Say Y here to enable the driver for the touchscreen on the
+ Sharp Tosa PDA.
+ depends on TOUCHSCREEN_WM97XX && MACH_TOSA
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tosa_ts.
+
config TOUCHSCREEN_TSC2101
tristate "TI TSC2101 touchscreen input driver"
depends on MACH_HX2750 && INPUT && INPUT_TOUCHSCREEN
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index f64d1a5..4fc0e17 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
obj-$(CONFIG_TOUCHSCREEN_TSC2101) += tsc2101_ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX_PXA) += pxa-wm97xx.o
+obj-$(CONFIG_TOUCHSCREEN_TOSA) += tosa_ts.o
ifeq ($(CONFIG_TOUCHSCREEN_WM9713),y)
wm97xx-ts-objs += wm9713.o
diff --git a/drivers/input/touchscreen/tosa_ts.c b/drivers/input/touchscreen/tosa_ts.c
new file mode 100644
index 0000000..bc733e9
--- /dev/null
+++ b/drivers/input/touchscreen/tosa_ts.c
@@ -0,0 +1,102 @@
+/*
+ * tosa_ts.c -- Touchscreen driver for Sharp SL-6000 (Tosa).
+ *
+ * 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/wm97xx.h>
+#include <asm/arch/tosa.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+/* 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"(1))
+
+static inline void tosa_lcd_wait_hsync(void)
+{
+ /* Waits for a rising edge on the VGA line */
+ while((GPLR(TOSA_GPIO_VGA_LINE) & GPIO_bit(TOSA_GPIO_VGA_LINE)) == 0);
+ while((GPLR(TOSA_GPIO_VGA_LINE) & GPIO_bit(TOSA_GPIO_VGA_LINE)) != 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 */
+void tosa_lcd_sync_on(int adcsel) {
+ unsigned long timer1 = 0, timer2 = 0, wait_time = 0;
+ if (adcsel == WM97XX_ADCSEL_Y) {
+ wait_time = tosa_lcd_get_hsync_time();
+ CCNT_ON();
+
+ 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);
+ }
+ }
+ }
+}
+
+void tosa_lcd_sync_off(void) {
+ CCNT_OFF();
+}
+
+static struct wm97xx_mach_ops tosa_mach_ops = {
+ .pre_sample = tosa_lcd_sync_on,
+ .post_sample = tosa_lcd_sync_off,
+};
+
+int tosa_ts_probe(struct device *dev) {
+ struct wm97xx *wm = dev->driver_data;
+ return wm97xx_register_mach_ops (wm, &tosa_mach_ops);
+}
+
+
+int tosa_ts_remove(struct device *dev) {
+ struct wm97xx *wm = dev->driver_data;
+ wm97xx_unregister_mach_ops (wm);
+ return 0;
+}
+
+static struct device_driver tosa_ts_driver = {
+ .name = "wm97xx-touchscreen",
+ .bus = &wm97xx_bus_type,
+ .owner = THIS_MODULE,
+ .probe = tosa_ts_probe,
+ .remove = tosa_ts_remove,
+};
+
+static int __init tosa_ts_init(void)
+{
+ return driver_register(&tosa_ts_driver);
+}
+
+static void __exit tosa_ts_exit(void)
+{
+ driver_unregister(&tosa_ts_driver);
+}
+
+module_init(tosa_ts_init);
+module_exit(tosa_ts_exit);
+
+/* Module information */
+MODULE_AUTHOR("Mike Arthur, mike@mikearthur.co.uk, www.wolfsonmicro.com");
+MODULE_DESCRIPTION("Sharp SL6000 Tosa Touch Screen Driver");
+MODULE_LICENSE("GPL");
--
1.4.4.4
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