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

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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>
This commit is contained in:
Rafael J. Wysocki 2011-12-23 01:24:25 +01:00
parent 40a5f8be2f
commit 9ee27ffbe3
1 changed files with 12 additions and 1 deletions
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13
drivers/input/touchscreen/st1232.c
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@ -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);