[PATCH RESEND v4 0/2] Add touch-keys support to the Zinitix touch driver

[PATCH RESEND v4 0/2] Add touch-keys support to the Zinitix touch driver

[Nikita Travkin]

This series adds support for the touch-keys that can be present on some
touchscreen configurations.

Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
Changes in v4:
- The series was partially applied, these patches dropped.
- Link to v3: https://lore.kernel.org/r/20220106072840.36851-1-nikita@trvn.ru

---
Nikita Travkin (2):
      dt-bindings: input: zinitix: Document touch-keys support
      input: zinitix: Add touchkey support

 .../bindings/input/touchscreen/zinitix,bt400.yaml  | 10 ++++
 drivers/input/touchscreen/zinitix.c                | 61 ++++++++++++++++++++--
 2 files changed, 68 insertions(+), 3 deletions(-)
---
base-commit: a734662572708cf062e974f659ae50c24fc1ad17
change-id: 20230801-zinitix-tkey-5a3023bc304c

Best regards,
-- 
Nikita Travkin <nikita@trvn.ru>

[PATCH RESEND v4 1/2] dt-bindings: input: zinitix: Document touch-keys support

[Nikita Travkin]

In some configurations the touch controller can support the touch-keys.
Document the linux,keycodes property that enables those keys and
specifies the keycodes that should be used to report the key events.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
 .../devicetree/bindings/input/touchscreen/zinitix,bt400.yaml   | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml b/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
index b1507463a03e..3f663ce3e44e 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
@@ -16,6 +16,7 @@ maintainers:
 
 allOf:
   - $ref: touchscreen.yaml#
+  - $ref: ../input.yaml#
 
 properties:
   $nodename:
@@ -79,6 +80,15 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [1, 2]
 
+  linux,keycodes:
+    description:
+      This property specifies an array of keycodes assigned to the
+      touch-keys that can be present in some touchscreen configurations.
+      If the touch-keys are enabled, controller firmware will assign some
+      touch sense lines to those keys.
+    minItems: 1
+    maxItems: 8
+
   touchscreen-size-x: true
   touchscreen-size-y: true
   touchscreen-fuzz-x: true

-- 
2.45.2

[PATCH RESEND v4 2/2] input: zinitix: Add touchkey support

[Nikita Travkin]

Zinitix touch controllers can use some of the sense lines for virtual
keys (like those found on many phones). Add support for those keys.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
 drivers/input/touchscreen/zinitix.c | 61 +++++++++++++++++++++++++++++++++++--
 1 file changed, 58 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
index 1b4807ba4624..75390d67689e 100644
--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -119,6 +119,7 @@
 
 #define DEFAULT_TOUCH_POINT_MODE		2
 #define MAX_SUPPORTED_FINGER_NUM		5
+#define MAX_SUPPORTED_BUTTON_NUM		8
 
 #define CHIP_ON_DELAY				15 // ms
 #define FIRMWARE_ON_DELAY			40 // ms
@@ -146,6 +147,8 @@ struct bt541_ts_data {
 	struct touchscreen_properties prop;
 	struct regulator_bulk_data supplies[2];
 	u32 zinitix_mode;
+	u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
+	int num_keycodes;
 };
 
 static int zinitix_read_data(struct i2c_client *client,
@@ -195,6 +198,7 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
 	struct i2c_client *client = bt541->client;
 	int i;
 	int error;
+	u16 int_flags = 0;
 
 	error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
 	if (error) {
@@ -225,6 +229,11 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
 	if (error)
 		return error;
 
+	error = zinitix_write_u16(client, ZINITIX_BUTTON_SUPPORTED_NUM,
+				  bt541->num_keycodes);
+	if (error)
+		return error;
+
 	error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
 				  bt541->zinitix_mode);
 	if (error)
@@ -235,9 +244,12 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
 	if (error)
 		return error;
 
-	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG,
-				  BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE |
-					BIT_UP);
+	int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
+
+	if (bt541->num_keycodes)
+		int_flags |= BIT_ICON_EVENT;
+
+	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, int_flags);
 	if (error)
 		return error;
 
@@ -350,6 +362,15 @@ static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
 	}
 }
 
+static void zinitix_report_keys(struct bt541_ts_data *bt541, u16 icon_events)
+{
+	int i;
+
+	for (i = 0; i < bt541->num_keycodes; i++)
+		input_report_key(bt541->input_dev,
+				 bt541->keycodes[i], !!(icon_events & BIT(i)));
+}
+
 static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
 {
 	struct bt541_ts_data *bt541 = bt541_handler;
@@ -358,6 +379,7 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
 	unsigned long finger_mask;
 	int error;
 	int i;
+	__le16 icon_events = 0;
 
 	memset(&touch_event, 0, sizeof(struct touch_event));
 
@@ -368,6 +390,17 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
 		goto out;
 	}
 
+	if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
+		error = zinitix_read_data(bt541->client, ZINITIX_ICON_STATUS_REG,
+					  &icon_events, sizeof(icon_events));
+		if (error) {
+			dev_err(&client->dev, "Failed to read icon events\n");
+			goto out;
+		}
+
+		zinitix_report_keys(bt541, le16_to_cpu(icon_events));
+	}
+
 	finger_mask = touch_event.finger_mask;
 	for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
 		const struct point_coord *p = &touch_event.point_coord[i];
@@ -453,6 +486,7 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
 {
 	struct input_dev *input_dev;
 	int error;
+	int i;
 
 	input_dev = devm_input_allocate_device(&bt541->client->dev);
 	if (!input_dev) {
@@ -470,6 +504,14 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
 	input_dev->open = zinitix_input_open;
 	input_dev->close = zinitix_input_close;
 
+	if (bt541->num_keycodes) {
+		input_dev->keycode = bt541->keycodes;
+		input_dev->keycodemax = bt541->num_keycodes;
+		input_dev->keycodesize = sizeof(bt541->keycodes[0]);
+		for (i = 0; i < bt541->num_keycodes; i++)
+			input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
+	}
+
 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
 	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
 	input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
@@ -534,6 +576,19 @@ static int zinitix_ts_probe(struct i2c_client *client)
 		return error;
 	}
 
+	bt541->num_keycodes = of_property_read_variable_u32_array(
+					client->dev.of_node, "linux,keycodes",
+					bt541->keycodes, 0,
+					ARRAY_SIZE(bt541->keycodes));
+	if (bt541->num_keycodes == -EINVAL) {
+		bt541->num_keycodes = 0;
+	} else if (bt541->num_keycodes < 0) {
+		dev_err(&client->dev,
+			"Unable to parse \"linux,keycodes\" property: %d\n",
+			bt541->num_keycodes);
+		return bt541->num_keycodes;
+	}
+
 	error = zinitix_init_input_dev(bt541);
 	if (error) {
 		dev_err(&client->dev,

-- 
2.45.2

Re: [PATCH RESEND v4 2/2] input: zinitix: Add touchkey support

[Dmitry Torokhov]

Hi Nikita,

On Sat, Jul 13, 2024 at 08:28:09PM +0500, Nikita Travkin wrote:
> Zinitix touch controllers can use some of the sense lines for virtual
> keys (like those found on many phones). Add support for those keys.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Nikita Travkin <nikita@trvn.ru>

A few comments:

> ---
>  drivers/input/touchscreen/zinitix.c | 61 +++++++++++++++++++++++++++++++++++--
>  1 file changed, 58 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
> index 1b4807ba4624..75390d67689e 100644
> --- a/drivers/input/touchscreen/zinitix.c
> +++ b/drivers/input/touchscreen/zinitix.c
> @@ -119,6 +119,7 @@
>  
>  #define DEFAULT_TOUCH_POINT_MODE		2
>  #define MAX_SUPPORTED_FINGER_NUM		5
> +#define MAX_SUPPORTED_BUTTON_NUM		8
>  
>  #define CHIP_ON_DELAY				15 // ms
>  #define FIRMWARE_ON_DELAY			40 // ms
> @@ -146,6 +147,8 @@ struct bt541_ts_data {
>  	struct touchscreen_properties prop;
>  	struct regulator_bulk_data supplies[2];
>  	u32 zinitix_mode;
> +	u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
> +	int num_keycodes;
>  };
>  
>  static int zinitix_read_data(struct i2c_client *client,
> @@ -195,6 +198,7 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>  	struct i2c_client *client = bt541->client;
>  	int i;
>  	int error;
> +	u16 int_flags = 0;

It is initialized unconditionally below, no need to initialize here.

>  
>  	error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
>  	if (error) {
> @@ -225,6 +229,11 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>  	if (error)
>  		return error;
>  
> +	error = zinitix_write_u16(client, ZINITIX_BUTTON_SUPPORTED_NUM,
> +				  bt541->num_keycodes);
> +	if (error)
> +		return error;
> +
>  	error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
>  				  bt541->zinitix_mode);
>  	if (error)
> @@ -235,9 +244,12 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>  	if (error)
>  		return error;
>  
> -	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG,
> -				  BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE |
> -					BIT_UP);
> +	int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
> +

Drop empty line.

> +	if (bt541->num_keycodes)
> +		int_flags |= BIT_ICON_EVENT;
> +
> +	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, int_flags);
>  	if (error)
>  		return error;
>  
> @@ -350,6 +362,15 @@ static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
>  	}
>  }
>  
> +static void zinitix_report_keys(struct bt541_ts_data *bt541, u16 icon_events)
> +{
> +	int i;
> +
> +	for (i = 0; i < bt541->num_keycodes; i++)
> +		input_report_key(bt541->input_dev,
> +				 bt541->keycodes[i], !!(icon_events & BIT(i)));
> +}
> +
>  static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>  {
>  	struct bt541_ts_data *bt541 = bt541_handler;
> @@ -358,6 +379,7 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>  	unsigned long finger_mask;
>  	int error;
>  	int i;
> +	__le16 icon_events = 0;

I do not believe this needs to be initialized.

>  
>  	memset(&touch_event, 0, sizeof(struct touch_event));
>  
> @@ -368,6 +390,17 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>  		goto out;
>  	}
>  
> +	if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
> +		error = zinitix_read_data(bt541->client, ZINITIX_ICON_STATUS_REG,
> +					  &icon_events, sizeof(icon_events));
> +		if (error) {
> +			dev_err(&client->dev, "Failed to read icon events\n");
> +			goto out;
> +		}
> +
> +		zinitix_report_keys(bt541, le16_to_cpu(icon_events));
> +	}
> +
>  	finger_mask = touch_event.finger_mask;
>  	for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
>  		const struct point_coord *p = &touch_event.point_coord[i];
> @@ -453,6 +486,7 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>  {
>  	struct input_dev *input_dev;
>  	int error;
> +	int i;
>  
>  	input_dev = devm_input_allocate_device(&bt541->client->dev);
>  	if (!input_dev) {
> @@ -470,6 +504,14 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>  	input_dev->open = zinitix_input_open;
>  	input_dev->close = zinitix_input_close;
>  
> +	if (bt541->num_keycodes) {
> +		input_dev->keycode = bt541->keycodes;
> +		input_dev->keycodemax = bt541->num_keycodes;
> +		input_dev->keycodesize = sizeof(bt541->keycodes[0]);
> +		for (i = 0; i < bt541->num_keycodes; i++)
> +			input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
> +	}
> +
>  	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
>  	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
>  	input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
> @@ -534,6 +576,19 @@ static int zinitix_ts_probe(struct i2c_client *client)
>  		return error;
>  	}
>  
> +	bt541->num_keycodes = of_property_read_variable_u32_array(
> +					client->dev.of_node, "linux,keycodes",
> +					bt541->keycodes, 0,
> +					ARRAY_SIZE(bt541->keycodes));

Please use generic device properties (device_property_*). There is no
equivalent for "read variable" so you'll need 2 calls, one to figure out
the array size and another one to read it.

See drivers/input/keyboard/mpr121_touchkey.c for an example.

> +	if (bt541->num_keycodes == -EINVAL) {
> +		bt541->num_keycodes = 0;
> +	} else if (bt541->num_keycodes < 0) {
> +		dev_err(&client->dev,
> +			"Unable to parse \"linux,keycodes\" property: %d\n",
> +			bt541->num_keycodes);
> +		return bt541->num_keycodes;
> +	}
> +
>  	error = zinitix_init_input_dev(bt541);
>  	if (error) {
>  		dev_err(&client->dev,
> 
> -- 
> 2.45.2
> 

Thanks.

-- 
Dmitry

Re: [PATCH RESEND v4 2/2] input: zinitix: Add touchkey support

[Nikita Travkin]

Dmitry Torokhov писал(а) 16.07.2024 10:45:
> Hi Nikita,
> 
> On Sat, Jul 13, 2024 at 08:28:09PM +0500, Nikita Travkin wrote:
>> Zinitix touch controllers can use some of the sense lines for virtual
>> keys (like those found on many phones). Add support for those keys.
>>
>> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
>> Signed-off-by: Nikita Travkin <nikita@trvn.ru>
> 
> A few comments:
> 
>> ---
>>  drivers/input/touchscreen/zinitix.c | 61 +++++++++++++++++++++++++++++++++++--
>>  1 file changed, 58 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
>> index 1b4807ba4624..75390d67689e 100644
>> --- a/drivers/input/touchscreen/zinitix.c
>> +++ b/drivers/input/touchscreen/zinitix.c
>> @@ -119,6 +119,7 @@
>>
>>  #define DEFAULT_TOUCH_POINT_MODE		2
>>  #define MAX_SUPPORTED_FINGER_NUM		5
>> +#define MAX_SUPPORTED_BUTTON_NUM		8
>>
>>  #define CHIP_ON_DELAY				15 // ms
>>  #define FIRMWARE_ON_DELAY			40 // ms
>> @@ -146,6 +147,8 @@ struct bt541_ts_data {
>>  	struct touchscreen_properties prop;
>>  	struct regulator_bulk_data supplies[2];
>>  	u32 zinitix_mode;
>> +	u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
>> +	int num_keycodes;
>>  };
>>
>>  static int zinitix_read_data(struct i2c_client *client,
>> @@ -195,6 +198,7 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>>  	struct i2c_client *client = bt541->client;
>>  	int i;
>>  	int error;
>> +	u16 int_flags = 0;
> 
> It is initialized unconditionally below, no need to initialize here.
> 
>>
>>  	error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
>>  	if (error) {
>> @@ -225,6 +229,11 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>>  	if (error)
>>  		return error;
>>
>> +	error = zinitix_write_u16(client, ZINITIX_BUTTON_SUPPORTED_NUM,
>> +				  bt541->num_keycodes);
>> +	if (error)
>> +		return error;
>> +
>>  	error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
>>  				  bt541->zinitix_mode);
>>  	if (error)
>> @@ -235,9 +244,12 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
>>  	if (error)
>>  		return error;
>>
>> -	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG,
>> -				  BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE |
>> -					BIT_UP);
>> +	int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
>> +
> 
> Drop empty line.
> 
>> +	if (bt541->num_keycodes)
>> +		int_flags |= BIT_ICON_EVENT;
>> +
>> +	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, int_flags);
>>  	if (error)
>>  		return error;
>>
>> @@ -350,6 +362,15 @@ static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
>>  	}
>>  }
>>
>> +static void zinitix_report_keys(struct bt541_ts_data *bt541, u16 icon_events)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < bt541->num_keycodes; i++)
>> +		input_report_key(bt541->input_dev,
>> +				 bt541->keycodes[i], !!(icon_events & BIT(i)));
>> +}
>> +
>>  static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>>  {
>>  	struct bt541_ts_data *bt541 = bt541_handler;
>> @@ -358,6 +379,7 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>>  	unsigned long finger_mask;
>>  	int error;
>>  	int i;
>> +	__le16 icon_events = 0;
> 
> I do not believe this needs to be initialized.
> 
>>
>>  	memset(&touch_event, 0, sizeof(struct touch_event));
>>
>> @@ -368,6 +390,17 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
>>  		goto out;
>>  	}
>>
>> +	if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
>> +		error = zinitix_read_data(bt541->client, ZINITIX_ICON_STATUS_REG,
>> +					  &icon_events, sizeof(icon_events));
>> +		if (error) {
>> +			dev_err(&client->dev, "Failed to read icon events\n");
>> +			goto out;
>> +		}
>> +
>> +		zinitix_report_keys(bt541, le16_to_cpu(icon_events));
>> +	}
>> +
>>  	finger_mask = touch_event.finger_mask;
>>  	for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
>>  		const struct point_coord *p = &touch_event.point_coord[i];
>> @@ -453,6 +486,7 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>>  {
>>  	struct input_dev *input_dev;
>>  	int error;
>> +	int i;
>>
>>  	input_dev = devm_input_allocate_device(&bt541->client->dev);
>>  	if (!input_dev) {
>> @@ -470,6 +504,14 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
>>  	input_dev->open = zinitix_input_open;
>>  	input_dev->close = zinitix_input_close;
>>
>> +	if (bt541->num_keycodes) {
>> +		input_dev->keycode = bt541->keycodes;
>> +		input_dev->keycodemax = bt541->num_keycodes;
>> +		input_dev->keycodesize = sizeof(bt541->keycodes[0]);
>> +		for (i = 0; i < bt541->num_keycodes; i++)
>> +			input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
>> +	}
>> +
>>  	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
>>  	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
>>  	input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
>> @@ -534,6 +576,19 @@ static int zinitix_ts_probe(struct i2c_client *client)
>>  		return error;
>>  	}
>>
>> +	bt541->num_keycodes = of_property_read_variable_u32_array(
>> +					client->dev.of_node, "linux,keycodes",
>> +					bt541->keycodes, 0,
>> +					ARRAY_SIZE(bt541->keycodes));
> 
> Please use generic device properties (device_property_*). There is no
> equivalent for "read variable" so you'll need 2 calls, one to figure out
> the array size and another one to read it.
> 
> See drivers/input/keyboard/mpr121_touchkey.c for an example.
> 

Ack, will switch to using device_property_ and fix all the above
suggestions in v5.

Thanks for your review!
Nikita

>> +	if (bt541->num_keycodes == -EINVAL) {
>> +		bt541->num_keycodes = 0;
>> +	} else if (bt541->num_keycodes < 0) {
>> +		dev_err(&client->dev,
>> +			"Unable to parse \"linux,keycodes\" property: %d\n",
>> +			bt541->num_keycodes);
>> +		return bt541->num_keycodes;
>> +	}
>> +
>>  	error = zinitix_init_input_dev(bt541);
>>  	if (error) {
>>  		dev_err(&client->dev,
>>
>> --
>> 2.45.2
>>
> 
> Thanks.