From 9ee27ffbe303ce18e7336115f1d443e9911eba53 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 23 Dec 2011 01:24:25 +0100 Subject: 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 --- drivers/input/touchscreen/st1232.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'drivers/input') 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 #include #include +#include #include #include @@ -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); -- cgit v1.2.3