Input: touchscreen: use wrapper for pxa2xx ac97 registers

To avoid a dependency on the pxa platform header files with
hardcoded registers, change the driver to call a wrapper
in the pxa2xx-ac97-lib that encapsulates all the other
ac97 stuff.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: linux-input@vger.kernel.org
Cc: alsa-devel@alsa-project.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/input/touchscreen/Kconfig

@@ -902,6 +902,7 @@ config TOUCHSCREEN_WM9713
 config TOUCHSCREEN_WM97XX_MAINSTONE
 	tristate "WM97xx Mainstone/Palm accelerated touch"
 	depends on TOUCHSCREEN_WM97XX && ARCH_PXA
+	depends on SND_PXA2XX_LIB_AC97
 	help
 	  Say Y here for support for streaming mode with WM97xx touchscreens
 	  on Mainstone, Palm Tungsten T5, TX and LifeDrive systems.
@@ -914,6 +915,7 @@ config TOUCHSCREEN_WM97XX_MAINSTONE
 config TOUCHSCREEN_WM97XX_ZYLONITE
 	tristate "Zylonite accelerated touch"
 	depends on TOUCHSCREEN_WM97XX && MACH_ZYLONITE
+	depends on SND_PXA2XX_LIB_AC97
 	select TOUCHSCREEN_WM9713
 	help
 	  Say Y here for support for streaming mode with the touchscreen

drivers/input/touchscreen/mainstone-wm97xx.c

@@ -28,7 +28,7 @@
 #include <linux/soc/pxa/cpu.h>
 #include <linux/wm97xx.h>
 
-#include <mach/regs-ac97.h>
+#include <sound/pxa2xx-lib.h>
 
 #include <asm/mach-types.h>
 
@@ -104,11 +104,11 @@ static void wm97xx_acc_pen_up(struct wm97xx *wm)
 	msleep(1);
 
 	if (cpu_is_pxa27x()) {
-		while (MISR & (1 << 2))
-			MODR;
+		while (pxa2xx_ac97_read_misr() & (1 << 2))
+			pxa2xx_ac97_read_modr();
 	} else if (cpu_is_pxa3xx()) {
 		for (count = 0; count < 16; count++)
-			MODR;
+			pxa2xx_ac97_read_modr();
 	}
 }
 
@@ -130,7 +130,7 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
 		return RC_PENUP;
 	}
 
-	x = MODR;
+	x = pxa2xx_ac97_read_modr();
 	if (x == last) {
 		tries++;
 		return RC_AGAIN;
@@ -138,10 +138,10 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
 	last = x;
 	do {
 		if (reads)
-			x = MODR;
-		y = MODR;
+			x = pxa2xx_ac97_read_modr();
+		y = pxa2xx_ac97_read_modr();
 		if (pressure)
-			p = MODR;
+			p = pxa2xx_ac97_read_modr();
 
 		dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
 			x, y, p);

drivers/input/touchscreen/zylonite-wm97xx.c

@@ -24,7 +24,7 @@
 #include <linux/soc/pxa/cpu.h>
 #include <linux/wm97xx.h>
 
-#include <mach/regs-ac97.h>
+#include <sound/pxa2xx-lib.h>
 
 struct continuous {
 	u16 id;    /* codec id */
@@ -79,7 +79,7 @@ static void wm97xx_acc_pen_up(struct wm97xx *wm)
 	msleep(1);
 
 	for (i = 0; i < 16; i++)
-		MODR;
+		pxa2xx_ac97_read_modr();
 }
 
 static int wm97xx_acc_pen_down(struct wm97xx *wm)
@@ -100,7 +100,7 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
 		return RC_PENUP;
 	}
 
-	x = MODR;
+	x = pxa2xx_ac97_read_modr();
 	if (x == last) {
 		tries++;
 		return RC_AGAIN;
@@ -108,10 +108,10 @@ static int wm97xx_acc_pen_down(struct wm97xx *wm)
 	last = x;
 	do {
 		if (reads)
-			x = MODR;
-		y = MODR;
+			x = pxa2xx_ac97_read_modr();
+		y = pxa2xx_ac97_read_modr();
 		if (pressure)
-			p = MODR;
+			p = pxa2xx_ac97_read_modr();
 
 		dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
 			x, y, p);

include/sound/pxa2xx-lib.h

@@ -52,4 +52,8 @@ extern int pxa2xx_ac97_hw_resume(void);
 extern int pxa2xx_ac97_hw_probe(struct platform_device *dev);
 extern void pxa2xx_ac97_hw_remove(struct platform_device *dev);
 
+/* modem registers, used by touchscreen driver */
+u32 pxa2xx_ac97_read_modr(void);
+u32 pxa2xx_ac97_read_misr(void);
+
 #endif

sound/arm/pxa2xx-ac97-lib.c

@@ -428,6 +428,18 @@ void pxa2xx_ac97_hw_remove(struct platform_device *dev)
 }
 EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_remove);
 
+u32 pxa2xx_ac97_read_modr(void)
+{
+	return MODR;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_read_modr);
+
+u32 pxa2xx_ac97_read_misr(void)
+{
+	return MISR;
+}
+EXPORT_SYMBOL_GPL(pxa2xx_ac97_read_misr);
+
 MODULE_AUTHOR("Nicolas Pitre");
 MODULE_DESCRIPTION("Intel/Marvell PXA sound library");
 MODULE_LICENSE("GPL");