Input: wm97xx - 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@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 35 insertions, 19 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 1c05b3286d65..07703bcb64c2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -366,11 +366,11 @@ config TOUCHSCREEN_WM97XX_ATMEL
           be called atmel-wm97xx.
 
 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 4cc047a5116e..c797bc04ee83 100644
--- a/drivers/input/touchscreen/mainstone-wm97xx.c
+++ b/drivers/input/touchscreen/mainstone-wm97xx.c
@@ -31,9 +31,11 @@
 #include <linux/interrupt.h>
 #include <linux/wm97xx.h>
 #include <linux/io.h>
+#include <linux/gpio.h>
+
 #include <mach/regs-ac97.h>
 
-#define VERSION         "0.13"
+#include <asm/mach-types.h>
 
 struct continuous {
         u16 id;    /* codec id */
@@ -62,6 +64,7 @@ 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 +174,7 @@ 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 +194,37 @@ 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 +242,17 @@ 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;
         }
 }