[ARM] Sharp sl-5500 touchscreen support

This adds support for sharp zaurus sl-5500 touchscreen.  It introduces
some not-too-nice ifs, but I guess copying whole ucb1x00-ts.c would be
bad idea...
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mfd/ucb1x00-ts.c

@@ -32,9 +32,12 @@
 #include <linux/suspend.h>
 #include <linux/slab.h>
 #include <linux/kthread.h>
+#include <linux/delay.h>
 
 #include <asm/dma.h>
 #include <asm/semaphore.h>
+#include <asm/arch/collie.h>
+#include <asm/mach-types.h>
 
 #include "ucb1x00.h"
 
@@ -85,12 +88,23 @@ static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts)
  */
 static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
 {
+	if (machine_is_collie()) {
+		ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0);
+		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
+				  UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW |
+				  UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
+
+		udelay(55);
+
+		return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync);
+	} else {
 		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 				  UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
 				  UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
 				  UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
 
 		return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
+	}
 }
 
 /*
@@ -101,12 +115,16 @@ static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
  */
 static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
 {
+	if (machine_is_collie())
+		ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
+	else {
 		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 				  UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
 				  UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
 		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 				  UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
 				  UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+	}
 	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
 			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
@@ -124,12 +142,17 @@ static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
  */
 static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts)
 {
+	if (machine_is_collie())
+		ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
+	else {
 		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 				  UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
 				  UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
 		ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 				  UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
 				  UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
+	}
+
 	ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
 			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
 			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
@@ -163,6 +186,15 @@ static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts)
 	return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
 }
 
+static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts)
+{
+	unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR);
+	if (machine_is_collie())
+		return (!(val & (UCB_TS_CR_TSPX_LOW)));
+	else
+		return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW));
+}
+
 /*
  * This is a RT kernel thread that handles the ADC accesses
  * (mainly so we can use semaphores in the UCB1200 core code
@@ -186,7 +218,7 @@ static int ucb1x00_thread(void *_ts)
 
 	add_wait_queue(&ts->irq_wait, &wait);
 	while (!kthread_should_stop()) {
-		unsigned int x, y, p, val;
+		unsigned int x, y, p;
 		signed long timeout;
 
 		ts->restart = 0;
@@ -206,12 +238,12 @@ static int ucb1x00_thread(void *_ts)
 		msleep(10);
 
 		ucb1x00_enable(ts->ucb);
-		val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR);
 
-		if (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW)) {
+
+		if (ucb1x00_ts_pen_down(ts)) {
 			set_task_state(tsk, TASK_INTERRUPTIBLE);
 
-			ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING);
+			ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING);
 			ucb1x00_disable(ts->ucb);
 
 			/*