Hi,
this patch adds interrupt driven touchscreen driver. It's an addition to
mainstone-wm97xx, but does some reorganization of the code there.
Mark, it's the same patch we discussed on IRC, so it should be OK.
Please consider applying, it's against Eric's tree.
Thanks
From a652b9cb63a8ef4293ef7028017219337553053d Mon Sep 17 00:00:00 2001
From: Marek Vasut <marek.vasut@xxxxxxxxx>
Date: Wed, 3 Jun 2009 19:50:49 +0200
Subject: [PATCH] Add Palm support to Mainstone accelerated touch
This patch refactors the Mainstone accelerated touch code a little and
adds support for interrupt driven touchscreen on Palm LifeDrive, TX and
Tungsten T5.
Signed-off-by: Marek Vasut <marek.vasut@xxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 4 +-
drivers/input/touchscreen/mainstone-wm97xx.c | 52 +++++++++++++++++--------
2 files changed, 37 insertions(+), 19 deletions(-)
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index b01fd61..4072d22 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -342,11 +342,11 @@ config TOUCHSCREEN_WM9713
WM9713 touchscreen controller.
config TOUCHSCREEN_WM97XX_MAINSTONE
- tristate "WM97xx Mainstone accelerated touch"
+ tristate "WM97xx Mainstone/Palm accelerated touch"
depends on TOUCHSCREEN_WM97XX && ARCH_PXA
help
Say Y here for support for streaming mode with WM97xx touchscreens
- on Mainstone systems.
+ on Mainstone, Palm Tungsten T5, TX and LifeDrive systems.
If unsure, say N.
diff --git a/drivers/input/touchscreen/mainstone-wm97xx.c b/drivers/input/touchscreen/mainstone-wm97xx.c
index 4cc047a..892ed43 100644
--- a/drivers/input/touchscreen/mainstone-wm97xx.c
+++ b/drivers/input/touchscreen/mainstone-wm97xx.c
@@ -31,9 +31,13 @@
#include <linux/interrupt.h>
#include <linux/wm97xx.h>
#include <linux/io.h>
+
#include <mach/regs-ac97.h>
+#include <mach/gpio.h>
+
+#include <asm/mach-types.h>
-#define VERSION "0.13"
+#define VERSION "0.14"
struct continuous {
u16 id; /* codec id */
@@ -62,6 +66,7 @@ static const struct continuous cinfo[] = {
/* continuous speed index */
static int sp_idx;
static u16 last, tries;
+static int irq;
/*
* Pen sampling frequency (Hz) in continuous mode.
@@ -171,7 +176,7 @@ up:
static int wm97xx_acc_startup(struct wm97xx *wm)
{
- int idx = 0;
+ int idx = 0, ret = 0;
/* check we have a codec */
if (wm->ac97 == NULL)
@@ -191,18 +196,37 @@ static int wm97xx_acc_startup(struct wm97xx *wm)
"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;
+ } 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:
- wm->pen_irq = IRQ_GPIO(4);
- set_irq_type(IRQ_GPIO(4), IRQ_TYPE_EDGE_BOTH);
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,
@@ -220,23 +244,17 @@ static int wm97xx_acc_startup(struct wm97xx *wm)
}
}
- return 0;
+out:
+ return ret;
}
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;
- }
+ if (irq)
+ gpio_free(irq);
+ wm->pen_irq = 0;
}
}
--
1.6.2.1
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