Hi Jeffy,
On Thu, Mar 08, 2018 at 03:32:11PM +0800, Jeffy Chen wrote:
> Add support for specifying event actions to trigger wakeup when using
> the gpio-keys input device as a wakeup source.
>
> This would allow the device to configure when to wakeup the system. For
> example a gpio-keys input device for pen insert, may only want to wakeup
> the system when ejecting the pen.
>
> Suggested-by: Brian Norris <briannorris@xxxxxxxxxxxx>
> Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
> ---
>
> Changes in v5:
> Remove unneeded irq_wake flag as Andy suggested.
>
> Changes in v4:
> Add dt-binding gpio-keys.h, stop saving irq trigger type, add enable/disable wakeup helpers as Dmitry suggested.
>
> Changes in v3:
> Adding more comments as Brian suggested.
>
> Changes in v2:
> Specify wakeup event action instead of irq trigger type as Brian
> suggested.
>
> drivers/input/keyboard/gpio_keys.c | 63 +++++++++++++++++++++++++++++++++--
> include/dt-bindings/input/gpio-keys.h | 13 ++++++++
> include/linux/gpio_keys.h | 2 ++
> 3 files changed, 75 insertions(+), 3 deletions(-)
> create mode 100644 include/dt-bindings/input/gpio-keys.h
>
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index 87e613dc33b8..f6d5cfd44833 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -30,6 +30,7 @@
> #include <linux/of.h>
> #include <linux/of_irq.h>
> #include <linux/spinlock.h>
> +#include <dt-bindings/input/gpio-keys.h>
>
> struct gpio_button_data {
> const struct gpio_keys_button *button;
> @@ -45,6 +46,7 @@ struct gpio_button_data {
> unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
>
> unsigned int irq;
> + unsigned int wakeup_trigger_type;
> spinlock_t lock;
> bool disabled;
> bool key_pressed;
> @@ -540,6 +542,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
> }
>
> if (bdata->gpiod) {
> + int active_low = gpiod_is_active_low(bdata->gpiod);
> +
> if (button->debounce_interval) {
> error = gpiod_set_debounce(bdata->gpiod,
> button->debounce_interval * 1000);
> @@ -568,6 +572,24 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
> isr = gpio_keys_gpio_isr;
> irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
>
> + switch (button->wakeup_event_action) {
> + case EV_ACT_ASSERTED:
> + bdata->wakeup_trigger_type = active_low ?
> + IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
> + break;
> + case EV_ACT_DEASSERTED:
> + bdata->wakeup_trigger_type = active_low ?
> + IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
> + break;
> + case EV_ACT_ANY:
> + /* fall through */
> + default:
> + /*
> + * For other cases, we are OK letting suspend/resume
> + * not reconfigure the trigger type.
> + */
> + break;
> + }
> } else {
> if (!button->irq) {
> dev_err(dev, "Found button without gpio or irq\n");
> @@ -586,6 +608,11 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
>
> isr = gpio_keys_irq_isr;
> irqflags = 0;
> +
> + /*
> + * For IRQ buttons, there is no interrupt for release.
> + * So we don't need to reconfigure the trigger type for wakeup.
> + */
> }
>
> bdata->code = &ddata->keymap[idx];
> @@ -718,6 +745,9 @@ gpio_keys_get_devtree_pdata(struct device *dev)
> /* legacy name */
> fwnode_property_read_bool(child, "gpio-key,wakeup");
>
> + fwnode_property_read_u32(child, "wakeup-event-action",
> + &button->wakeup_event_action);
> +
> button->can_disable =
> fwnode_property_read_bool(child, "linux,can-disable");
>
> @@ -845,6 +875,31 @@ static int gpio_keys_probe(struct platform_device *pdev)
> return 0;
> }
>
> +static int gpio_keys_enable_wakeup(struct gpio_button_data *bdata)
These new helpers need to be __maybe_unused in case we compile on system
without suspend support.
I also wanted a bit more of error handling, so I ended up with the
version of the patch below. Can you please try it and let me know if I
broke it.
Thanks.
--
Dmitry
Input: gpio-keys - add support for wakeup event action
From: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Add support for specifying event actions to trigger wakeup when using
the gpio-keys input device as a wakeup source.
This would allow the device to configure when to wakeup the system. For
example a gpio-keys input device for pen insert, may only want to wakeup
the system when ejecting the pen.
Suggested-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
.../devicetree/bindings/input/gpio-keys.txt | 8 +
drivers/input/keyboard/gpio_keys.c | 145 ++++++++++++++++++--
include/dt-bindings/input/gpio-keys.h | 13 ++
include/linux/gpio_keys.h | 2
4 files changed, 154 insertions(+), 14 deletions(-)
create mode 100644 include/dt-bindings/input/gpio-keys.h
diff --git a/Documentation/devicetree/bindings/input/gpio-keys.txt b/Documentation/devicetree/bindings/input/gpio-keys.txt
index a94940481e55a..996ce84352cbf 100644
--- a/Documentation/devicetree/bindings/input/gpio-keys.txt
+++ b/Documentation/devicetree/bindings/input/gpio-keys.txt
@@ -26,6 +26,14 @@ Optional subnode-properties:
If not specified defaults to 5.
- wakeup-source: Boolean, button can wake-up the system.
(Legacy property supported: "gpio-key,wakeup")
+ - wakeup-event-action: Specifies whether the key should wake the
+ system when asserted, when deasserted, or both. This property is
+ only valid for keys that wake up the system (e.g., when the
+ "wakeup-source" property is also provided).
+ Supported values are defined in linux-event-codes.h:
+ EV_ACT_ASSERTED - asserted
+ EV_ACT_DEASSERTED - deasserted
+ EV_ACT_ANY - both asserted and deasserted
- linux,can-disable: Boolean, indicates that button is connected
to dedicated (not shared) interrupt which can be disabled to
suppress events from the button.
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 87e613dc33b80..966428da6bc71 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -30,6 +30,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/spinlock.h>
+#include <dt-bindings/input/gpio-keys.h>
struct gpio_button_data {
const struct gpio_keys_button *button;
@@ -45,6 +46,7 @@ struct gpio_button_data {
unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
unsigned int irq;
+ unsigned int wakeup_trigger_type;
spinlock_t lock;
bool disabled;
bool key_pressed;
@@ -540,6 +542,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
}
if (bdata->gpiod) {
+ bool active_low = gpiod_is_active_low(bdata->gpiod);
+
if (button->debounce_interval) {
error = gpiod_set_debounce(bdata->gpiod,
button->debounce_interval * 1000);
@@ -568,6 +572,24 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_gpio_isr;
irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
+ switch (button->wakeup_event_action) {
+ case EV_ACT_ASSERTED:
+ bdata->wakeup_trigger_type = active_low ?
+ IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
+ break;
+ case EV_ACT_DEASSERTED:
+ bdata->wakeup_trigger_type = active_low ?
+ IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
+ break;
+ case EV_ACT_ANY:
+ /* fall through */
+ default:
+ /*
+ * For other cases, we are OK letting suspend/resume
+ * not reconfigure the trigger type.
+ */
+ break;
+ }
} else {
if (!button->irq) {
dev_err(dev, "Found button without gpio or irq\n");
@@ -586,6 +608,11 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_irq_isr;
irqflags = 0;
+
+ /*
+ * For IRQ buttons, there is no interrupt for release.
+ * So we don't need to reconfigure the trigger type for wakeup.
+ */
}
bdata->code = &ddata->keymap[idx];
@@ -718,6 +745,9 @@ gpio_keys_get_devtree_pdata(struct device *dev)
/* legacy name */
fwnode_property_read_bool(child, "gpio-key,wakeup");
+ fwnode_property_read_u32(child, "wakeup-event-action",
+ &button->wakeup_event_action);
+
button->can_disable =
fwnode_property_read_bool(child, "linux,can-disable");
@@ -845,19 +875,112 @@ static int gpio_keys_probe(struct platform_device *pdev)
return 0;
}
+static int __maybe_unused
+gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata)
+{
+ int error;
+
+ error = enable_irq_wake(bdata->irq);
+ if (error) {
+ dev_err(bdata->input->dev.parent,
+ "failed to configure IRQ %d as wakeup source: %d\n",
+ bdata->irq, error);
+ return error;
+ }
+
+ if (bdata->wakeup_trigger_type) {
+ error = irq_set_irq_type(bdata->irq,
+ bdata->wakeup_trigger_type);
+ if (error) {
+ dev_err(bdata->input->dev.parent,
+ "failed to set wakeup trigger %08x for IRQ %d: %d\n",
+ bdata->wakeup_trigger_type, bdata->irq, error);
+ disable_irq_wake(bdata->irq);
+ return error;
+ }
+ }
+
+ return 0;
+}
+
+static void __maybe_unused
+gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata)
+{
+ int error;
+
+ /*
+ * The trigger type is always both edges for gpio-based keys and we do
+ * not support changing wakeup trigger for interrupt-based keys.
+ */
+ if (bdata->wakeup_trigger_type) {
+ error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH);
+ if (error)
+ dev_warn(bdata->input->dev.parent,
+ "failed to restore interrupt trigger for IRQ %d: %d\n",
+ bdata->irq, error);
+ }
+
+ error = disable_irq_wake(bdata->irq);
+ if (error)
+ dev_warn(bdata->input->dev.parent,
+ "failed to disable IRQ %d as wake source: %d\n",
+ bdata->irq, error);
+}
+
+static int __maybe_unused
+gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata)
+{
+ struct gpio_button_data *bdata;
+ int error;
+ int i;
+
+ for (i = 0; i < ddata->pdata->nbuttons; i++) {
+ bdata = &ddata->data[i];
+ if (bdata->button->wakeup) {
+ error = gpio_keys_button_enable_wakeup(bdata);
+ if (error)
+ goto err_out;
+ }
+ bdata->suspended = true;
+ }
+
+ return 0;
+
+err_out:
+ while (--i >= 0) {
+ bdata = &ddata->data[i];
+ if (bdata->button->wakeup)
+ gpio_keys_button_disable_wakeup(bdata);
+ bdata->suspended = false;
+ }
+
+ return error;
+}
+
+static void __maybe_unused
+gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata)
+{
+ struct gpio_button_data *bdata;
+ int i;
+
+ for (i = 0; i < ddata->pdata->nbuttons; i++) {
+ bdata = &ddata->data[i];
+ bdata->suspended = false;
+ if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq)))
+ gpio_keys_button_disable_wakeup(bdata);
+ }
+}
+
static int __maybe_unused gpio_keys_suspend(struct device *dev)
{
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
- int i;
+ int error;
if (device_may_wakeup(dev)) {
- for (i = 0; i < ddata->pdata->nbuttons; i++) {
- struct gpio_button_data *bdata = &ddata->data[i];
- if (bdata->button->wakeup)
- enable_irq_wake(bdata->irq);
- bdata->suspended = true;
- }
+ error = gpio_keys_enable_wakeup(ddata);
+ if (error)
+ return error;
} else {
mutex_lock(&input->mutex);
if (input->users)
@@ -873,15 +996,9 @@ static int __maybe_unused gpio_keys_resume(struct device *dev)
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int error = 0;
- int i;
if (device_may_wakeup(dev)) {
- for (i = 0; i < ddata->pdata->nbuttons; i++) {
- struct gpio_button_data *bdata = &ddata->data[i];
- if (bdata->button->wakeup)
- disable_irq_wake(bdata->irq);
- bdata->suspended = false;
- }
+ gpio_keys_disable_wakeup(ddata);
} else {
mutex_lock(&input->mutex);
if (input->users)
diff --git a/include/dt-bindings/input/gpio-keys.h b/include/dt-bindings/input/gpio-keys.h
new file mode 100644
index 0000000000000..8962df79e753b
--- /dev/null
+++ b/include/dt-bindings/input/gpio-keys.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for gpio keys bindings.
+ */
+
+#ifndef _DT_BINDINGS_GPIO_KEYS_H
+#define _DT_BINDINGS_GPIO_KEYS_H
+
+#define EV_ACT_ANY 0x00 /* asserted or deasserted */
+#define EV_ACT_ASSERTED 0x01 /* asserted */
+#define EV_ACT_DEASSERTED 0x02 /* deasserted */
+
+#endif /* _DT_BINDINGS_GPIO_KEYS_H */
diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index d06bf77400f16..7160df54a6fe3 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h
@@ -13,6 +13,7 @@ struct device;
* @desc: label that will be attached to button's gpio
* @type: input event type (%EV_KEY, %EV_SW, %EV_ABS)
* @wakeup: configure the button as a wake-up source
+ * @wakeup_event_action: event action to trigger wakeup
* @debounce_interval: debounce ticks interval in msecs
* @can_disable: %true indicates that userspace is allowed to
* disable button via sysfs
@@ -26,6 +27,7 @@ struct gpio_keys_button {
const char *desc;
unsigned int type;
int wakeup;
+ int wakeup_event_action;
int debounce_interval;
bool can_disable;
int value;
--
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