[PATCH V3 1/5] dt-bindings: fsl: scu: add scu key binding

[PATCH V3 1/5] dt-bindings: fsl: scu: add scu key binding

[Anson Huang]

NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
system controller, the system controller is in charge of system
power, clock and scu key event etc. management, Linux kernel has
to communicate with system controller via MU (message unit) IPC
to get scu key event, add binding doc for i.MX system controller
key driver.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V2:
	- use "key" instead of "pwrkey" as the key function can be defined in DT.
---
 .../devicetree/bindings/arm/freescale/fsl,scu.txt          | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index c149fad..5eab7d0 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -157,6 +157,15 @@ Required properties:
 Optional properties:
 - timeout-sec: contains the watchdog timeout in seconds.
 
+SCU key bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible: should be:
+              "fsl,imx8qxp-sc-key"
+              followed by "fsl,imx-sc-key";
+- linux,keycodes: See Documentation/devicetree/bindings/input/keys.txt
+
 Example (imx8qxp):
 -------------
 aliases {
@@ -220,6 +229,11 @@ firmware {
 			compatible = "fsl,imx8qxp-sc-rtc";
 		};
 
+		scu_key: scu-key {
+			compatible = "fsl,imx8qxp-sc-key", "fsl,imx-sc-key";
+			linux,keycode = <KEY_POWER>;
+		};
+
 		watchdog {
 			compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
 			timeout-sec = <60>;
-- 
2.7.4


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Re: [PATCH V3 1/5] dt-bindings: fsl: scu: add scu key binding

[Rob Herring]

On Tue,  3 Sep 2019 17:36:36 -0400, Anson Huang wrote:
> NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
> system controller, the system controller is in charge of system
> power, clock and scu key event etc. management, Linux kernel has
> to communicate with system controller via MU (message unit) IPC
> to get scu key event, add binding doc for i.MX system controller
> key driver.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> Changes since V2:
> 	- use "key" instead of "pwrkey" as the key function can be defined in DT.
> ---
>  .../devicetree/bindings/arm/freescale/fsl,scu.txt          | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

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[PATCH V3 2/5] input: keyboard: imx_sc: Add i.MX system controller key support

[Anson Huang]

i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
inside, the system controller is in charge of controlling power,
clock and scu key etc..

Adds i.MX system controller key driver support, Linux kernel has
to communicate with system controller via MU (message unit) IPC
to get scu key's status.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V2:
	- use private platform data instead of global data;
	- use "key" instead of "pwrkey";
	- fix some data format.
---
 drivers/input/keyboard/Kconfig      |   7 ++
 drivers/input/keyboard/Makefile     |   1 +
 drivers/input/keyboard/imx_sc_key.c | 178 ++++++++++++++++++++++++++++++++++++
 3 files changed, 186 insertions(+)
 create mode 100644 drivers/input/keyboard/imx_sc_key.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 2e6d288..607acf2 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -469,6 +469,13 @@ config KEYBOARD_IMX
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx_keypad.
 
+config KEYBOARD_IMX_SC_KEY
+	tristate "IMX SCU Key Driver"
+	depends on IMX_SCU
+	help
+	  This is the system controller key driver for NXP i.MX SoCs with
+	  system controller inside.
+
 config KEYBOARD_NEWTON
 	tristate "Newton keyboard"
 	select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 9510325..f5b1752 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
 obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o
 obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
 obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
+obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
 obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
 obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
 obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
new file mode 100644
index 0000000..e69479b
--- /dev/null
+++ b/drivers/input/keyboard/imx_sc_key.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+#define DEBOUNCE_TIME	100
+#define REPEAT_INTERVAL	60
+
+#define SC_IRQ_BUTTON		1
+#define SC_IRQ_GROUP_WAKE	3
+#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS	18
+
+struct imx_key_drv_data {
+	int keycode;
+	bool keystate;  /* 1: pressed, 0: release */
+	bool delay_check;
+	struct delayed_work check_work;
+	struct input_dev *input;
+	struct imx_sc_ipc *key_ipc_handle;
+	struct notifier_block key_notifier;
+};
+
+struct imx_sc_msg_key {
+	struct imx_sc_rpc_msg hdr;
+	u8 state;
+};
+
+static int imx_sc_key_notify(struct notifier_block *nb,
+			     unsigned long event, void *group)
+{
+	struct imx_key_drv_data *priv =
+				 container_of(nb,
+					      struct imx_key_drv_data,
+					      key_notifier);
+
+	if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE)
+	    && !priv->delay_check) {
+		priv->delay_check = 1;
+		schedule_delayed_work(&priv->check_work,
+				      msecs_to_jiffies(REPEAT_INTERVAL));
+	}
+
+	return 0;
+}
+
+static void imx_sc_check_for_events(struct work_struct *work)
+{
+	struct imx_key_drv_data *priv =
+				 container_of(work,
+					      struct imx_key_drv_data,
+					      check_work.work);
+	struct input_dev *input = priv->input;
+	struct imx_sc_msg_key msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	bool state;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_MISC;
+	hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
+	hdr->size = 1;
+
+	ret = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
+	if (ret) {
+		dev_err(&input->dev, "read imx sc key failed, ret %d\n", ret);
+		return;
+	}
+
+	state = (bool)msg.state;
+
+	if (!state && !priv->keystate)
+		state = true;
+
+	if (state ^ priv->keystate) {
+		pm_wakeup_event(input->dev.parent, 0);
+		priv->keystate = state;
+		input_event(input, EV_KEY, priv->keycode, state);
+		input_sync(input);
+		if (!state)
+			priv->delay_check = 0;
+		pm_relax(priv->input->dev.parent);
+	}
+
+	if (state)
+		schedule_delayed_work(&priv->check_work,
+				      msecs_to_jiffies(DEBOUNCE_TIME));
+}
+
+static int imx_sc_key_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	static struct imx_key_drv_data *priv;
+	struct input_dev *input;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ret = imx_scu_get_handle(&priv->key_ipc_handle);
+	if (ret)
+		return ret;
+
+	if (of_property_read_u32(np, "linux,keycode", &priv->keycode)) {
+		dev_err(&pdev->dev, "missing KEY_POWER in DT\n");
+		return -EINVAL;
+	}
+
+	INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events);
+
+	input = devm_input_allocate_device(&pdev->dev);
+	if (!input) {
+		dev_err(&pdev->dev, "failed to allocate the input device\n");
+		return -ENOMEM;
+	}
+
+	input->name = pdev->name;
+	input->phys = "imx-sc-key/input0";
+	input->id.bustype = BUS_HOST;
+
+	input_set_capability(input, EV_KEY, priv->keycode);
+
+	ret = input_register_device(input);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		return ret;
+	}
+
+	priv->input = input;
+	platform_set_drvdata(pdev, priv);
+
+	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, true);
+	if (ret) {
+		dev_warn(&pdev->dev, "enable scu group irq failed\n");
+		return ret;
+	}
+
+	priv->key_notifier.notifier_call = imx_sc_key_notify;
+	ret = imx_scu_irq_register_notifier(&priv->key_notifier);
+	if (ret) {
+		imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false);
+		dev_warn(&pdev->dev, "register scu notifier failed\n");
+	}
+
+	return ret;
+}
+
+static const struct of_device_id imx_sc_key_ids[] = {
+	{ .compatible = "fsl,imx-sc-key" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
+
+static struct platform_driver imx_sc_key_driver = {
+	.driver = {
+		.name = "imx-sc-key",
+		.of_match_table = imx_sc_key_ids,
+	},
+	.probe = imx_sc_key_probe,
+};
+module_platform_driver(imx_sc_key_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("i.MX System Controller Key Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4


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Re: [PATCH V3 2/5] input: keyboard: imx_sc: Add i.MX system controller key support

[Oleksij Rempel]

On 03.09.19 23:36, Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and scu key etc..
> 
> Adds i.MX system controller key driver support, Linux kernel has
> to communicate with system controller via MU (message unit) IPC
> to get scu key's status.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>

> ---
> Changes since V2:
> 	- use private platform data instead of global data;
> 	- use "key" instead of "pwrkey";
> 	- fix some data format.
> ---
>   drivers/input/keyboard/Kconfig      |   7 ++
>   drivers/input/keyboard/Makefile     |   1 +
>   drivers/input/keyboard/imx_sc_key.c | 178 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 186 insertions(+)
>   create mode 100644 drivers/input/keyboard/imx_sc_key.c
> 
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index 2e6d288..607acf2 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -469,6 +469,13 @@ config KEYBOARD_IMX
>   	  To compile this driver as a module, choose M here: the
>   	  module will be called imx_keypad.
>   
> +config KEYBOARD_IMX_SC_KEY
> +	tristate "IMX SCU Key Driver"
> +	depends on IMX_SCU
> +	help
> +	  This is the system controller key driver for NXP i.MX SoCs with
> +	  system controller inside.
> +
>   config KEYBOARD_NEWTON
>   	tristate "Newton keyboard"
>   	select SERIO
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 9510325..f5b1752 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
>   obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o
>   obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
>   obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
> +obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
>   obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
>   obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
>   obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
> diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
> new file mode 100644
> index 0000000..e69479b
> --- /dev/null
> +++ b/drivers/input/keyboard/imx_sc_key.c
> @@ -0,0 +1,178 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/firmware/imx/sci.h>
> +#include <linux/init.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +
> +#define DEBOUNCE_TIME	100
> +#define REPEAT_INTERVAL	60
> +
> +#define SC_IRQ_BUTTON		1
> +#define SC_IRQ_GROUP_WAKE	3
> +#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS	18
> +
> +struct imx_key_drv_data {
> +	int keycode;
> +	bool keystate;  /* 1: pressed, 0: release */
> +	bool delay_check;
> +	struct delayed_work check_work;
> +	struct input_dev *input;
> +	struct imx_sc_ipc *key_ipc_handle;
> +	struct notifier_block key_notifier;
> +};
> +
> +struct imx_sc_msg_key {
> +	struct imx_sc_rpc_msg hdr;
> +	u8 state;
> +};
> +
> +static int imx_sc_key_notify(struct notifier_block *nb,
> +			     unsigned long event, void *group)
> +{
> +	struct imx_key_drv_data *priv =
> +				 container_of(nb,
> +					      struct imx_key_drv_data,
> +					      key_notifier);
> +
> +	if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE)
> +	    && !priv->delay_check) {
> +		priv->delay_check = 1;
> +		schedule_delayed_work(&priv->check_work,
> +				      msecs_to_jiffies(REPEAT_INTERVAL));
> +	}
> +
> +	return 0;
> +}
> +
> +static void imx_sc_check_for_events(struct work_struct *work)
> +{
> +	struct imx_key_drv_data *priv =
> +				 container_of(work,
> +					      struct imx_key_drv_data,
> +					      check_work.work);
> +	struct input_dev *input = priv->input;
> +	struct imx_sc_msg_key msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	bool state;
> +	int ret;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_MISC;
> +	hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
> +	hdr->size = 1;
> +
> +	ret = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
> +	if (ret) {
> +		dev_err(&input->dev, "read imx sc key failed, ret %d\n", ret);
> +		return;
> +	}
> +
> +	state = (bool)msg.state;
> +
> +	if (!state && !priv->keystate)
> +		state = true;
> +
> +	if (state ^ priv->keystate) {
> +		pm_wakeup_event(input->dev.parent, 0);
> +		priv->keystate = state;
> +		input_event(input, EV_KEY, priv->keycode, state);
> +		input_sync(input);
> +		if (!state)
> +			priv->delay_check = 0;
> +		pm_relax(priv->input->dev.parent);
> +	}
> +
> +	if (state)
> +		schedule_delayed_work(&priv->check_work,
> +				      msecs_to_jiffies(DEBOUNCE_TIME));
> +}
> +
> +static int imx_sc_key_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	static struct imx_key_drv_data *priv;
> +	struct input_dev *input;
> +	int ret;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	ret = imx_scu_get_handle(&priv->key_ipc_handle);
> +	if (ret)
> +		return ret;
> +
> +	if (of_property_read_u32(np, "linux,keycode", &priv->keycode)) {
> +		dev_err(&pdev->dev, "missing KEY_POWER in DT\n");
> +		return -EINVAL;
> +	}
> +
> +	INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events);
> +
> +	input = devm_input_allocate_device(&pdev->dev);
> +	if (!input) {
> +		dev_err(&pdev->dev, "failed to allocate the input device\n");
> +		return -ENOMEM;
> +	}
> +
> +	input->name = pdev->name;
> +	input->phys = "imx-sc-key/input0";
> +	input->id.bustype = BUS_HOST;
> +
> +	input_set_capability(input, EV_KEY, priv->keycode);
> +
> +	ret = input_register_device(input);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register input device\n");
> +		return ret;
> +	}
> +
> +	priv->input = input;
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, true);
> +	if (ret) {
> +		dev_warn(&pdev->dev, "enable scu group irq failed\n");
> +		return ret;
> +	}
> +
> +	priv->key_notifier.notifier_call = imx_sc_key_notify;
> +	ret = imx_scu_irq_register_notifier(&priv->key_notifier);
> +	if (ret) {
> +		imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false);
> +		dev_warn(&pdev->dev, "register scu notifier failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id imx_sc_key_ids[] = {
> +	{ .compatible = "fsl,imx-sc-key" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
> +
> +static struct platform_driver imx_sc_key_driver = {
> +	.driver = {
> +		.name = "imx-sc-key",
> +		.of_match_table = imx_sc_key_ids,
> +	},
> +	.probe = imx_sc_key_probe,
> +};
> +module_platform_driver(imx_sc_key_driver);
> +
> +MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
> +MODULE_DESCRIPTION("i.MX System Controller Key Driver");
> +MODULE_LICENSE("GPL v2");
> 

Kind regards,
Oleksij Rempel

-- 
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Re: [PATCH V3 2/5] input: keyboard: imx_sc: Add i.MX system controller key support

[Dmitry Torokhov]

Hi Anson,

On Tue, Sep 03, 2019 at 05:36:37PM -0400, Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and scu key etc..
> 
> Adds i.MX system controller key driver support, Linux kernel has
> to communicate with system controller via MU (message unit) IPC
> to get scu key's status.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> Changes since V2:
> 	- use private platform data instead of global data;
> 	- use "key" instead of "pwrkey";
> 	- fix some data format.
> ---
>  drivers/input/keyboard/Kconfig      |   7 ++
>  drivers/input/keyboard/Makefile     |   1 +
>  drivers/input/keyboard/imx_sc_key.c | 178 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 186 insertions(+)
>  create mode 100644 drivers/input/keyboard/imx_sc_key.c
> 
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index 2e6d288..607acf2 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -469,6 +469,13 @@ config KEYBOARD_IMX
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called imx_keypad.
>  
> +config KEYBOARD_IMX_SC_KEY
> +	tristate "IMX SCU Key Driver"
> +	depends on IMX_SCU
> +	help
> +	  This is the system controller key driver for NXP i.MX SoCs with
> +	  system controller inside.
> +
>  config KEYBOARD_NEWTON
>  	tristate "Newton keyboard"
>  	select SERIO
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 9510325..f5b1752 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
>  obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o
>  obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
>  obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
> +obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
>  obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
>  obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
>  obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
> diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
> new file mode 100644
> index 0000000..e69479b
> --- /dev/null
> +++ b/drivers/input/keyboard/imx_sc_key.c
> @@ -0,0 +1,178 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2019 NXP.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/firmware/imx/sci.h>
> +#include <linux/init.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +
> +#define DEBOUNCE_TIME	100
> +#define REPEAT_INTERVAL	60
> +
> +#define SC_IRQ_BUTTON		1
> +#define SC_IRQ_GROUP_WAKE	3
> +#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS	18
> +
> +struct imx_key_drv_data {
> +	int keycode;
> +	bool keystate;  /* 1: pressed, 0: release */
> +	bool delay_check;
> +	struct delayed_work check_work;
> +	struct input_dev *input;
> +	struct imx_sc_ipc *key_ipc_handle;
> +	struct notifier_block key_notifier;
> +};
> +
> +struct imx_sc_msg_key {
> +	struct imx_sc_rpc_msg hdr;
> +	u8 state;
> +};
> +
> +static int imx_sc_key_notify(struct notifier_block *nb,
> +			     unsigned long event, void *group)
> +{
> +	struct imx_key_drv_data *priv =
> +				 container_of(nb,
> +					      struct imx_key_drv_data,
> +					      key_notifier);
> +
> +	if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE)
> +	    && !priv->delay_check) {
> +		priv->delay_check = 1;
> +		schedule_delayed_work(&priv->check_work,
> +				      msecs_to_jiffies(REPEAT_INTERVAL));
> +	}
> +
> +	return 0;
> +}
> +
> +static void imx_sc_check_for_events(struct work_struct *work)
> +{
> +	struct imx_key_drv_data *priv =
> +				 container_of(work,
> +					      struct imx_key_drv_data,
> +					      check_work.work);
> +	struct input_dev *input = priv->input;
> +	struct imx_sc_msg_key msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	bool state;
> +	int ret;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_MISC;
> +	hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
> +	hdr->size = 1;
> +
> +	ret = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
> +	if (ret) {
> +		dev_err(&input->dev, "read imx sc key failed, ret %d\n", ret);
> +		return;
> +	}
> +
> +	state = (bool)msg.state;
> +
> +	if (!state && !priv->keystate)
> +		state = true;
> +
> +	if (state ^ priv->keystate) {
> +		pm_wakeup_event(input->dev.parent, 0);
> +		priv->keystate = state;
> +		input_event(input, EV_KEY, priv->keycode, state);
> +		input_sync(input);
> +		if (!state)
> +			priv->delay_check = 0;
> +		pm_relax(priv->input->dev.parent);
> +	}
> +
> +	if (state)
> +		schedule_delayed_work(&priv->check_work,
> +				      msecs_to_jiffies(DEBOUNCE_TIME));

Hmm, I am not quite sure follow the code. Judging by the name, you are
trying to handle debounce, but if I understand this correctly you
already sent out the press event for now.

Could you please explain what you are trying to do here.

> +}
> +
> +static int imx_sc_key_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	static struct imx_key_drv_data *priv;
> +	struct input_dev *input;
> +	int ret;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	ret = imx_scu_get_handle(&priv->key_ipc_handle);
> +	if (ret)
> +		return ret;
> +
> +	if (of_property_read_u32(np, "linux,keycode", &priv->keycode)) {
> +		dev_err(&pdev->dev, "missing KEY_POWER in DT\n");
> +		return -EINVAL;
> +	}
> +
> +	INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events);
> +
> +	input = devm_input_allocate_device(&pdev->dev);
> +	if (!input) {
> +		dev_err(&pdev->dev, "failed to allocate the input device\n");
> +		return -ENOMEM;
> +	}
> +
> +	input->name = pdev->name;
> +	input->phys = "imx-sc-key/input0";
> +	input->id.bustype = BUS_HOST;
> +
> +	input_set_capability(input, EV_KEY, priv->keycode);
> +
> +	ret = input_register_device(input);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register input device\n");
> +		return ret;
> +	}
> +
> +	priv->input = input;
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, true);
> +	if (ret) {
> +		dev_warn(&pdev->dev, "enable scu group irq failed\n");
> +		return ret;
> +	}
> +
> +	priv->key_notifier.notifier_call = imx_sc_key_notify;
> +	ret = imx_scu_irq_register_notifier(&priv->key_notifier);
> +	if (ret) {
> +		imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false);
> +		dev_warn(&pdev->dev, "register scu notifier failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id imx_sc_key_ids[] = {
> +	{ .compatible = "fsl,imx-sc-key" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
> +
> +static struct platform_driver imx_sc_key_driver = {
> +	.driver = {
> +		.name = "imx-sc-key",
> +		.of_match_table = imx_sc_key_ids,
> +	},
> +	.probe = imx_sc_key_probe,

You need a remove() handler to disable the itq group, remove the
notifier, cancel the delayed work, etc.

> +};
> +module_platform_driver(imx_sc_key_driver);
> +
> +MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
> +MODULE_DESCRIPTION("i.MX System Controller Key Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.7.4
> 

Thanks.

-- 
Dmitry

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RE: [PATCH V3 2/5] input: keyboard: imx_sc: Add i.MX system controller key support

[Anson Huang]

Hi, Dmitry

> On Tue, Sep 03, 2019 at 05:36:37PM -0400, Anson Huang wrote:
> > i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> > inside, the system controller is in charge of controlling power, clock
> > and scu key etc..
> >
> > Adds i.MX system controller key driver support, Linux kernel has to
> > communicate with system controller via MU (message unit) IPC to get
> > scu key's status.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > ---
> > Changes since V2:
> > 	- use private platform data instead of global data;
> > 	- use "key" instead of "pwrkey";
> > 	- fix some data format.
> > ---
> >  drivers/input/keyboard/Kconfig      |   7 ++
> >  drivers/input/keyboard/Makefile     |   1 +
> >  drivers/input/keyboard/imx_sc_key.c | 178
> > ++++++++++++++++++++++++++++++++++++
> >  3 files changed, 186 insertions(+)
> >  create mode 100644 drivers/input/keyboard/imx_sc_key.c
> >
> > diff --git a/drivers/input/keyboard/Kconfig
> > b/drivers/input/keyboard/Kconfig index 2e6d288..607acf2 100644
> > --- a/drivers/input/keyboard/Kconfig
> > +++ b/drivers/input/keyboard/Kconfig
> > @@ -469,6 +469,13 @@ config KEYBOARD_IMX
> >  	  To compile this driver as a module, choose M here: the
> >  	  module will be called imx_keypad.
> >
> > +config KEYBOARD_IMX_SC_KEY
> > +	tristate "IMX SCU Key Driver"
> > +	depends on IMX_SCU
> > +	help
> > +	  This is the system controller key driver for NXP i.MX SoCs with
> > +	  system controller inside.
> > +
> >  config KEYBOARD_NEWTON
> >  	tristate "Newton keyboard"
> >  	select SERIO
> > diff --git a/drivers/input/keyboard/Makefile
> > b/drivers/input/keyboard/Makefile index 9510325..f5b1752 100644
> > --- a/drivers/input/keyboard/Makefile
> > +++ b/drivers/input/keyboard/Makefile
> > @@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
> >  obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o
> >  obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
> >  obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
> > +obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
> >  obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
> >  obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
> >  obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
> > diff --git a/drivers/input/keyboard/imx_sc_key.c
> > b/drivers/input/keyboard/imx_sc_key.c
> > new file mode 100644
> > index 0000000..e69479b
> > --- /dev/null
> > +++ b/drivers/input/keyboard/imx_sc_key.c
> > @@ -0,0 +1,178 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright 2019 NXP.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/err.h>
> > +#include <linux/firmware/imx/sci.h>
> > +#include <linux/init.h>
> > +#include <linux/input.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/jiffies.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/platform_device.h>
> > +
> > +#define DEBOUNCE_TIME	100
> > +#define REPEAT_INTERVAL	60
> > +
> > +#define SC_IRQ_BUTTON		1
> > +#define SC_IRQ_GROUP_WAKE	3
> > +#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS	18
> > +
> > +struct imx_key_drv_data {
> > +	int keycode;
> > +	bool keystate;  /* 1: pressed, 0: release */
> > +	bool delay_check;
> > +	struct delayed_work check_work;
> > +	struct input_dev *input;
> > +	struct imx_sc_ipc *key_ipc_handle;
> > +	struct notifier_block key_notifier;
> > +};
> > +
> > +struct imx_sc_msg_key {
> > +	struct imx_sc_rpc_msg hdr;
> > +	u8 state;
> > +};
> > +
> > +static int imx_sc_key_notify(struct notifier_block *nb,
> > +			     unsigned long event, void *group) {
> > +	struct imx_key_drv_data *priv =
> > +				 container_of(nb,
> > +					      struct imx_key_drv_data,
> > +					      key_notifier);
> > +
> > +	if ((event & SC_IRQ_BUTTON) && (*(u8 *)group ==
> SC_IRQ_GROUP_WAKE)
> > +	    && !priv->delay_check) {
> > +		priv->delay_check = 1;
> > +		schedule_delayed_work(&priv->check_work,
> > +				      msecs_to_jiffies(REPEAT_INTERVAL));
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static void imx_sc_check_for_events(struct work_struct *work) {
> > +	struct imx_key_drv_data *priv =
> > +				 container_of(work,
> > +					      struct imx_key_drv_data,
> > +					      check_work.work);
> > +	struct input_dev *input = priv->input;
> > +	struct imx_sc_msg_key msg;
> > +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> > +	bool state;
> > +	int ret;
> > +
> > +	hdr->ver = IMX_SC_RPC_VERSION;
> > +	hdr->svc = IMX_SC_RPC_SVC_MISC;
> > +	hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
> > +	hdr->size = 1;
> > +
> > +	ret = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
> > +	if (ret) {
> > +		dev_err(&input->dev, "read imx sc key failed, ret %d\n", ret);
> > +		return;
> > +	}
> > +
> > +	state = (bool)msg.state;
> > +
> > +	if (!state && !priv->keystate)
> > +		state = true;
> > +
> > +	if (state ^ priv->keystate) {
> > +		pm_wakeup_event(input->dev.parent, 0);
> > +		priv->keystate = state;
> > +		input_event(input, EV_KEY, priv->keycode, state);
> > +		input_sync(input);
> > +		if (!state)
> > +			priv->delay_check = 0;
> > +		pm_relax(priv->input->dev.parent);
> > +	}
> > +
> > +	if (state)
> > +		schedule_delayed_work(&priv->check_work,
> > +				      msecs_to_jiffies(DEBOUNCE_TIME));
> 
> Hmm, I am not quite sure follow the code. Judging by the name, you are
> trying to handle debounce, but if I understand this correctly you already sent
> out the press event for now.
> 
> Could you please explain what you are trying to do here.

The name is kind of confused, the "DEBOUNCE_TIME" here should be "REPEAT_INTERVAL"
actually, the  "DEBOUNCE_TIME" should be used in the irq hanlder instead.	
As the SCU ONLY send out interrupt when the key is pressed, so here we have to repeat
the delay work to loop check the button release event, the press event is sent out once the
key state is valid, and then start to check until key is released.

I will switch the "DEBOUNCE_TIME" and "REPEAT_INTERVAL" in V4.

> 
> > +}
> > +
> > +static int imx_sc_key_probe(struct platform_device *pdev) {
> > +	struct device_node *np = pdev->dev.of_node;
> > +	static struct imx_key_drv_data *priv;
> > +	struct input_dev *input;
> > +	int ret;
> > +
> > +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return -ENOMEM;
> > +
> > +	ret = imx_scu_get_handle(&priv->key_ipc_handle);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (of_property_read_u32(np, "linux,keycode", &priv->keycode)) {
> > +		dev_err(&pdev->dev, "missing KEY_POWER in DT\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	INIT_DELAYED_WORK(&priv->check_work,
> imx_sc_check_for_events);
> > +
> > +	input = devm_input_allocate_device(&pdev->dev);
> > +	if (!input) {
> > +		dev_err(&pdev->dev, "failed to allocate the input device\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	input->name = pdev->name;
> > +	input->phys = "imx-sc-key/input0";
> > +	input->id.bustype = BUS_HOST;
> > +
> > +	input_set_capability(input, EV_KEY, priv->keycode);
> > +
> > +	ret = input_register_device(input);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "failed to register input device\n");
> > +		return ret;
> > +	}
> > +
> > +	priv->input = input;
> > +	platform_set_drvdata(pdev, priv);
> > +
> > +	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE,
> SC_IRQ_BUTTON, true);
> > +	if (ret) {
> > +		dev_warn(&pdev->dev, "enable scu group irq failed\n");
> > +		return ret;
> > +	}
> > +
> > +	priv->key_notifier.notifier_call = imx_sc_key_notify;
> > +	ret = imx_scu_irq_register_notifier(&priv->key_notifier);
> > +	if (ret) {
> > +		imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE,
> SC_IRQ_BUTTON, false);
> > +		dev_warn(&pdev->dev, "register scu notifier failed\n");
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static const struct of_device_id imx_sc_key_ids[] = {
> > +	{ .compatible = "fsl,imx-sc-key" },
> > +	{ /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
> > +
> > +static struct platform_driver imx_sc_key_driver = {
> > +	.driver = {
> > +		.name = "imx-sc-key",
> > +		.of_match_table = imx_sc_key_ids,
> > +	},
> > +	.probe = imx_sc_key_probe,
> 
> You need a remove() handler to disable the itq group, remove the notifier,
> cancel the delayed work, etc.

I will add it in V4.

Thanks,
Anson

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[PATCH V3 3/5] arm64: dts: imx8qxp: Add scu key node

[Anson Huang]

Add scu key node for i.MX8QXP, disabled by default as it
depends on board design.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V2:
	- use "key" instead of "pwrkey".
---
 arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
index 1133b41..71e38c1 100644
--- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
@@ -8,6 +8,7 @@
 #include <dt-bindings/clock/imx8-clock.h>
 #include <dt-bindings/firmware/imx/rsrc.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/pinctrl/pads-imx8qxp.h>
 
@@ -174,6 +175,12 @@
 			#power-domain-cells = <1>;
 		};
 
+		scu_key: scu-key {
+			compatible = "fsl,imx8qxp-sc-key", "fsl,imx-sc-key";
+			linux,keycode = <KEY_POWER>;
+			status = "disabled";
+		};
+
 		rtc: rtc {
 			compatible = "fsl,imx8qxp-sc-rtc";
 		};
-- 
2.7.4


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[PATCH V3 4/5] arm64: dts: imx8qxp-mek: Enable scu key

[Anson Huang]

Enable scu key for i.MX8QXP MEK board.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V2:
	- change node name accordingly.
---
 arch/arm64/boot/dts/freescale/imx8qxp-mek.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
index 1946805..88dd9132 100644
--- a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
+++ b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
@@ -234,3 +234,7 @@
 &adma_dsp {
 	status = "okay";
 };
+
+&scu_key {
+	status = "okay";
+};
-- 
2.7.4


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[PATCH V3 5/5] arm64: defconfig: Enable CONFIG_KEYBOARD_IMX_SC_KEY as module

[Anson Huang]

Select CONFIG_KEYBOARD_IMX_SC_KEY as module by default to
support i.MX8QXP scu key driver.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V2:
	- change CONFIG name.
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 49bb3d4..2913c21 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -313,6 +313,7 @@ CONFIG_INPUT_EVDEV=y
 CONFIG_KEYBOARD_ADC=m
 CONFIG_KEYBOARD_GPIO=y
 CONFIG_KEYBOARD_SNVS_PWRKEY=m
+CONFIG_KEYBOARD_IMX_SC_KEY=m
 CONFIG_KEYBOARD_CROS_EC=y
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_ATMEL_MXT=m
-- 
2.7.4


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