Hi, Dmitry
Anson Huang
Best Regards!
> -----Original Message-----
> From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Sent: Thursday, September 6, 2018 1:27 AM
> To: Anson Huang <anson.huang@xxxxxxx>
> Cc: robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; Marco Antonio Franchi
> <marco.franchi@xxxxxxx>; Fabio Estevam <fabio.estevam@xxxxxxx>;
> linux-input@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>
> Subject: Re: [PATCH 1/2] input: egalax_ts: add system wakeup support
>
> Hi Anson,
>
> On Wed, Sep 05, 2018 at 05:26:46PM +0800, Anson Huang wrote:
> > This patch adds wakeup function support for egalax touch screen, if
> > "wakeup-source" is added to device tree's egalax touch screen node,
> > the wakeup function will be enabled, and egalax touch screen will be
> > able to wakeup system from suspend.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> > ---
> > drivers/input/touchscreen/egalax_ts.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/input/touchscreen/egalax_ts.c
> > b/drivers/input/touchscreen/egalax_ts.c
> > index 80e69bb..74984ed 100644
> > --- a/drivers/input/touchscreen/egalax_ts.c
> > +++ b/drivers/input/touchscreen/egalax_ts.c
> > @@ -164,6 +164,7 @@ static int egalax_firmware_version(struct
> > i2c_client *client) static int egalax_ts_probe(struct i2c_client *client,
> > const struct i2c_device_id *id) {
> > + struct device_node *np = client->dev.of_node;
> > struct egalax_ts *ts;
> > struct input_dev *input_dev;
> > int error;
> > @@ -224,6 +225,9 @@ static int egalax_ts_probe(struct i2c_client *client,
> > if (error)
> > return error;
> >
> > + if (of_property_read_bool(np, "wakeup-source"))
> > + device_init_wakeup(&client->dev, true);
>
> This is done in i2c core, there is no need to do it in the driver.
Correct, I removed it in V2 patch.
>
> > +
> > return 0;
> > }
> >
> > @@ -241,6 +245,9 @@ static int __maybe_unused
> egalax_ts_suspend(struct device *dev)
> > struct i2c_client *client = to_i2c_client(dev);
> > int ret;
> >
> > + if (device_may_wakeup(dev))
> > + return enable_irq_wake(client->irq);
> > +
> > ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
> > return ret > 0 ? 0 : ret;
> > }
> > @@ -249,6 +256,9 @@ static int __maybe_unused egalax_ts_resume(struct
> > device *dev) {
> > struct i2c_client *client = to_i2c_client(dev);
> >
> > + if (device_may_wakeup(dev))
> > + return 0;
>
> This will end up with unbalanced enable_irq_wake() from suspend.
Ah, it is a mistake, I fix it in V2 patch, please help review it.
And for the other patch about adding "wakeup-source" into dt-binding, I think it may
be no need now, since it is already included in i2c's dt-binding, right?
Thanks.
Anson.
>
> > +
> > return egalax_wake_up_device(client); }
> >
> > --
> > 2.7.4
> >
>
> Thanks.
>
> --
> Dmitry
