ENGR00154016 DA9053 TSI: stop TSI threads during system idle and no touch event

Changes Made
--------------
1) On Pen UP the TSI threads are stopped and
On Pen DOWN TSI threads are started
2) Removed TSI thread creation from Probe,
instead creating the TSI threads when PEN DOWN

Expected Output
-------------------
1) TSI threads to stop either when system is suspended or,
there is no touch event.Thus conserving power during system
suspend, idle and no touch event.
2) TSI threads to start only on touch event and not when system is resumed.
3) On system Start/Restart TSI threads will not be created and started till
the touch detection.

Signed-off-by: Wayne Zou <b36644@freescale.com>

1 files changed, 25 insertions, 12 deletions

diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
index c6ff49eaaa4d..96a4f02831bc 100644
--- a/drivers/input/touchscreen/da9052_tsi.c
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -543,18 +543,6 @@ static ssize_t __init da9052_tsi_init_drv(struct da9052_ts_priv *priv)
 
 	da9052_init_tsi_fifos(priv);
 
-	init_completion(&priv->tsi_reg_proc_thread.notifier);
-	priv->tsi_reg_proc_thread.state = ACTIVE;
-	priv->tsi_reg_proc_thread.pid =
-				kernel_thread(da9052_tsi_reg_proc_thread,
-					priv, CLONE_KERNEL | SIGCHLD);
-
-	init_completion(&priv->tsi_raw_proc_thread.notifier);
-	priv->tsi_raw_proc_thread.state = ACTIVE;
-	priv->tsi_raw_proc_thread.pid =
-				kernel_thread(da9052_tsi_raw_proc_thread,
-					priv, CLONE_KERNEL | SIGCHLD);
-
 	ret = da9052_tsi_config_state(priv, DEFAULT_TSI_STATE);
 	if (ret) {
 		for (cnt = 0; cnt < NUM_INPUT_DEVS; cnt++) {
@@ -1159,6 +1147,8 @@ static void da9052_tsi_penup_event(struct da9052_ts_priv *priv)
 	priv->early_data_flag = TRUE;
 	priv->debounce_over = FALSE;
 	priv->win_reference_valid = FALSE;
+	priv->tsi_reg_proc_thread.state = INACTIVE;
+	priv->tsi_raw_proc_thread.state = INACTIVE;
 
 	printk(KERN_DEBUG "The raw data count is %d\n", priv->raw_data_cnt);
 	printk(KERN_DEBUG "The OS data count is %d\n", priv->os_data_cnt);
@@ -1218,6 +1208,25 @@ void da9052_tsi_pen_down_handler(struct da9052_eh_nb *eh_data, u32 event)
 
 	tsi_reg.tsi_state =  SAMPLING_ACTIVE;
 
+	init_completion(&priv->tsi_reg_proc_thread.notifier);
+	priv->tsi_reg_proc_thread.state = ACTIVE;
+	priv->tsi_reg_proc_thread.thread_task =
+	kthread_run(da9052_tsi_reg_proc_thread, (void *)priv, "da9052_tsi_reg");
+	if (IS_ERR(priv->tsi_reg_proc_thread.thread_task)) {
+		printk(KERN_ERR "da9052: failed to create kthread tsi_reg");
+		priv->tsi_reg_proc_thread.thread_task = NULL;
+		goto fail;
+	}
+
+	init_completion(&priv->tsi_raw_proc_thread.notifier);
+	priv->tsi_raw_proc_thread.state = ACTIVE;
+	priv->tsi_raw_proc_thread.thread_task =
+	kthread_run(da9052_tsi_raw_proc_thread, (void *)priv, "da9052_tsi_raw");
+	if (IS_ERR(priv->tsi_raw_proc_thread.thread_task)) {
+		printk(KERN_ERR "da9052: failed to create kthread tsi_raw");
+		priv->tsi_raw_proc_thread.thread_task = NULL;
+		goto fail;
+	}
 	goto success;
 
 fail:
@@ -1345,6 +1354,10 @@ static s32 da9052_tsi_get_rawdata(struct da9052_tsi_reg *buf, u8 cnt) {
 static ssize_t da9052_tsi_suspend(struct platform_device *dev, 
 							pm_message_t state)
 {
+	struct da9052_ts_priv *priv = platform_get_drvdata(dev);
+
+	priv->tsi_reg_proc_thread.state = INACTIVE;
+	priv->tsi_raw_proc_thread.state = INACTIVE;
 	printk(KERN_INFO "%s: called\n", __FUNCTION__);
 	return 0;
 }