Hello Dmitry,
Thank you for your review!
On Mon, 23 Jul 2018 15:39:26 -0700
Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> wrote:
> On Thu, Jul 19, 2018 at 12:46:45AM +0200, Ondřej Jirman wrote:
> > Hello Mylène,
> >
> > On Wed, Jul 18, 2018 at 08:27:17PM +0200, Mylène Josserand wrote:
> > > Add the support of regulator to use it as VCC source.
> > >
> > > Signed-off-by: Mylène Josserand <mylene.josserand@xxxxxxxxxxx>
> > > ---
> > > .../bindings/input/touchscreen/edt-ft5x06.txt | 1 +
> > > drivers/input/touchscreen/edt-ft5x06.c | 29 ++++++++++++++++++++++
> > > 2 files changed, 30 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > index 025cf8c9324a..48e975b9c1aa 100644
> > > --- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> > > @@ -30,6 +30,7 @@ Required properties:
> > > Optional properties:
> > > - reset-gpios: GPIO specification for the RESET input
> > > - wake-gpios: GPIO specification for the WAKE input
> > > + - vcc-supply: Regulator that supplies the touchscreen
> > >
> > > - pinctrl-names: should be "default"
> > > - pinctrl-0: a phandle pointing to the pin settings for the
> > > diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
> > > index 1e18ca0d1b4e..aa94494b06b5 100644
> > > --- a/drivers/input/touchscreen/edt-ft5x06.c
> > > +++ b/drivers/input/touchscreen/edt-ft5x06.c
> > > @@ -39,6 +39,7 @@
> > > #include <linux/input/mt.h>
> > > #include <linux/input/touchscreen.h>
> > > #include <linux/of_device.h>
> > > +#include <linux/regulator/consumer.h>
> > >
> > > #define WORK_REGISTER_THRESHOLD 0x00
> > > #define WORK_REGISTER_REPORT_RATE 0x08
> > > @@ -91,6 +92,7 @@ struct edt_ft5x06_ts_data {
> > > struct touchscreen_properties prop;
> > > u16 num_x;
> > > u16 num_y;
> > > + struct regulator *vcc;
> > >
> > > struct gpio_desc *reset_gpio;
> > > struct gpio_desc *wake_gpio;
> > > @@ -991,6 +993,22 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
> > >
> > > tsdata->max_support_points = chip_data->max_support_points;
> > >
> > > + tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
> > > + if (IS_ERR(tsdata->vcc)) {
> > > + error = PTR_ERR(tsdata->vcc);
> > > + if (error != -EPROBE_DEFER)
> > > + dev_err(&client->dev, "failed to request regulator: %d\n",
> > > + error);
> > > + return error;
> > > + }
> > > +
> > > + error = regulator_enable(tsdata->vcc);
> > > + if (error < 0) {
> > > + dev_err(&client->dev, "failed to enable vcc: %d\n",
> > > + error);
> > > + return error;
> > > + }
> > > +
> > > tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
> > > "reset", GPIOD_OUT_HIGH);
> > > if (IS_ERR(tsdata->reset_gpio)) {
>
> You need to disable regulator here. We do not have
> devm_regulator_enable() (and Mark had some concerns about mixing managed
> and unmanaged APIs for regulators so we can't simply introduce it),
> so I'd recommend using devm_add_action_or_reset() and iunstall custom
> action to turn off regulator.
Yep, I see. Thank you about "devm_add_action_or_reset", I did not know
this function. I will add it in next version.
>
> > > @@ -1120,20 +1138,31 @@ static int edt_ft5x06_ts_remove(struct i2c_client *client)
> > > static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
> > > {
> > > struct i2c_client *client = to_i2c_client(dev);
> > > + struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
> > >
> > > if (device_may_wakeup(dev))
> > > enable_irq_wake(client->irq);
> > >
> > > + regulator_disable(tsdata->vcc);
> > > +
> >
> > How will the touchscreen wakeup the system with interrupt if you power it off
> > on suspend? Perhaps guard this with device_may_wakeup() too?
>
> Exactly, it should be in an "else" branch.
>
> Thanks.
>
I see, I will add it in v4.
Best regards,
--
Mylène Josserand, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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