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Subject[PATCH 2/2] tsc2007: make platform callbacks optional
The platform callbacks are only called if supplied. Makes the driver
to fallback on only pressure calculation to decide when the pen is up.

Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
---
Index: linux-2.6.30/drivers/input/touchscreen/tsc2007.c
===================================================================
--- linux-2.6.30/drivers/input/touchscreen/tsc2007.c (revision 943)
+++ linux-2.6.30/drivers/input/touchscreen/tsc2007.c (revision 945)
@@ -59,6 +59,10 @@
#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)

+#define PEN_STATE_UP 0x00
+#define PEN_STATE_DOWN 0x01
+#define PEN_STATE_IRQ 0x01
+
struct ts_event {
u16 x;
u16 y;
@@ -76,7 +80,7 @@
u16 model;
u16 x_plate_ohms;

- unsigned pendown;
+ unsigned penstate;
int irq;

int (*get_pendown_state)(void);
@@ -149,15 +153,18 @@
*
* The only safe way to check for the pen up condition is in the
* work function by reading the pen signal state (it's a GPIO and IRQ).
+ *
+ * But sadly we don't always have the possibility to use such callback
+ * in that case rely on the pressure anyway
*/
if (rt) {
struct input_dev *input = ts->input;

- if (!ts->pendown) {
+ if (ts->penstate != PEN_STATE_DOWN) {
dev_dbg(&ts->client->dev, "DOWN\n");

input_report_key(input, BTN_TOUCH, 1);
- ts->pendown = 1;
+ ts->penstate = PEN_STATE_DOWN;
}

input_report_abs(input, ABS_X, x);
@@ -168,7 +175,9 @@

dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
x, y, rt);
- }
+ } else if (!ts->get_pendown_state)
+ /* no callback to check pendown state, use pressure */
+ ts->penstate = PEN_STATE_UP;

schedule_delayed_work(&ts->work, TS_POLL_PERIOD);
}
@@ -195,7 +204,14 @@
{
struct tsc2007 *ts =
container_of(to_delayed_work(work), struct tsc2007, work);
- if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
+
+ /* either we have the pendown callback, and use it, otherwise
+ * we look at the pendown variable
+ */
+ if ((ts->get_pendown_state && unlikely(!ts->get_pendown_state()) &&
+ ts->penstate != PEN_STATE_UP) ||
+ (!ts->get_pendown_state &&
+ unlikely(ts->penstate == PEN_STATE_UP))) {
struct input_dev *input = ts->input;

dev_dbg(&ts->client->dev, "UP\n");
@@ -204,7 +220,7 @@
input_report_abs(input, ABS_PRESSURE, 0);
input_sync(input);

- ts->pendown = 0;
+ ts->penstate = PEN_STATE_UP;
enable_irq(ts->irq);
} else {
/* pen is still down, continue with the measurement */
@@ -219,8 +235,9 @@
{
struct tsc2007 *ts = handle;

- if (likely(ts->get_pendown_state())) {
+ if (!ts->get_pendown_state || likely(ts->get_pendown_state())) {
disable_irq_nosync(ts->irq);
+ ts->penstate = PEN_STATE_IRQ;
schedule_delayed_work(&ts->work, 0);
}

@@ -264,7 +281,8 @@
ts->get_pendown_state = pdata->get_pendown_state;
ts->clear_penirq = pdata->clear_penirq;

- pdata->init_platform_hw();
+ if (pdata->init_platform_hw)
+ pdata->init_platform_hw();

snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
--
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