PM / input / touchscreen: Make st1232 use device PM QoS constraints

Make the st1232 driver use dev_pm_qos_add_ancestor_request() to
add a device PM QoS latency constraint for the controller it
depends on, so that the controller won't go into an overly deep
low-power state when the touchscreen has to be particularly
responsive (e.g. when the user moves his or her finger on it).

This change is based on a prototype patch from Guennadi Liakhovetski.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index 4ab371358b33..8825fe37d433 100644
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -23,6 +23,7 @@
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/pm_qos.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 
@@ -46,6 +47,7 @@ struct st1232_ts_data {
         struct i2c_client *client;
         struct input_dev *input_dev;
         struct st1232_ts_finger finger[MAX_FINGERS];
+        struct dev_pm_qos_request low_latency_req;
 };
 
 static int st1232_ts_read_data(struct st1232_ts_data *ts)
@@ -118,8 +120,17 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
         }
 
         /* SYN_MT_REPORT only if no contact */
-        if (!count)
+        if (!count) {
                 input_mt_sync(input_dev);
+                if (ts->low_latency_req.dev) {
+                        dev_pm_qos_remove_request(&ts->low_latency_req);
+                        ts->low_latency_req.dev = NULL;
+                }
+        } else if (!ts->low_latency_req.dev) {
+                /* First contact, request 100 us latency. */
+                dev_pm_qos_add_ancestor_request(&ts->client->dev,
+                                                &ts->low_latency_req, 100);
+        }
 
         /* SYN_REPORT */
         input_sync(input_dev);