Re: [PATCH v2 5/7] input: keyboard: Add support for MAX7360 keypad

[Christophe JAILLET <christophe.jaillet@wanadoo.fr>]

Le 23/12/2024 à 17:42, Mathieu Dubois-Briand a écrit :
> Add driver for Maxim Integrated MAX7360 keypad controller, providing
> support for up to 64 keys, with a matrix of 8 columns and 8 rows.
> 
> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>

...

> +static int max7360_keypad_open(struct input_dev *pdev)
> +{
> +	struct max7360_keypad *max7360_keypad = input_get_drvdata(pdev);
> +	int error;
> +
> +	/*
> +	 * Somebody is using the device: get out of sleep.
> +	 */
> +	error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_CONFIG,
> +				  MAX7360_CFG_SLEEP, MAX7360_CFG_SLEEP);
> +	if (error) {
> +		dev_err(&max7360_keypad->input->dev,
> +			"Failed to write max7360 configuration");

Missing \n.

> +		return error;
> +	}
> +
> +	return 0;
> +}
> +
> +static void max7360_keypad_close(struct input_dev *pdev)
> +{
> +	struct max7360_keypad *max7360_keypad = input_get_drvdata(pdev);
> +	int error;
> +
> +	/*
> +	 * Nobody is using the device anymore: go to sleep.
> +	 */
> +	error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_CONFIG,
> +				  MAX7360_CFG_SLEEP, ~MAX7360_CFG_SLEEP);
> +	if (error)
> +		dev_err(&max7360_keypad->input->dev,
> +			"Failed to write max7360 configuration");

Missing \n.

> +}
> +
> +static int max7360_keypad_hw_init(struct max7360_keypad *max7360_keypad)
> +{
> +	unsigned int val;
> +	int error;
> +
> +	val = max7360_keypad->debounce_ms - MAX7360_DEBOUNCE_MIN;
> +	error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_DEBOUNCE,
> +				  MAX7360_DEBOUNCE,
> +				  FIELD_PREP(MAX7360_DEBOUNCE, val));
> +	if (error) {
> +		dev_err(&max7360_keypad->input->dev,
> +			"Failed to write max7360 debounce configuration");

Missing \n.
This is called from probe. Use dev_err_rpobe()?

> +		return error;
> +	}
> +
> +	error = regmap_write_bits(max7360_keypad->regmap, MAX7360_REG_INTERRUPT,
> +				  MAX7360_INTERRUPT_TIME_MASK,
> +				  FIELD_PREP(MAX7360_INTERRUPT_TIME_MASK, 1));
> +	if (error) {
> +		dev_err(&max7360_keypad->input->dev,
> +			"Failed to write max7360 keypad interrupt configuration");

Missing \n.
This is called from probe. Use dev_err_rpobe()?

> +		return error;
> +	}
> +
> +	return 0;
> +}

...

> +static int max7360_keypad_probe(struct platform_device *pdev)
> +{
> +	struct max7360_keypad *max7360_keypad;
> +	struct input_dev *input;
> +	bool autorepeat;
> +	int error;
> +	int irq;
> +
> +	if (!pdev->dev.parent)
> +		return dev_err_probe(&pdev->dev, -ENODEV, "No parent device\n");
> +
> +	irq = platform_get_irq_byname(to_platform_device(pdev->dev.parent),
> +				      "intk");
> +	if (irq < 0)
> +		return irq;
> +
> +	max7360_keypad = devm_kzalloc(&pdev->dev, sizeof(*max7360_keypad),
> +				      GFP_KERNEL);
> +	if (!max7360_keypad)
> +		return -ENOMEM;
> +
> +	max7360_keypad->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!max7360_keypad->regmap)
> +		return dev_err_probe(&pdev->dev, -ENODEV,
> +				     "Could not get parent regmap\n");
> +
> +	error = max7360_keypad_parse_dt(pdev, max7360_keypad, &autorepeat);
> +	if (error)
> +		return error;
> +
> +	input = devm_input_allocate_device(pdev->dev.parent);
> +	if (!input)
> +		return dev_err_probe(&pdev->dev, -ENOMEM,
> +				     "Failed to allocate input device\n");

Not sure an error message is needed.

> +
> +	max7360_keypad->input = input;
> +
> +	input->id.bustype = BUS_I2C;
> +	input->name = pdev->name;
> +	input->open = max7360_keypad_open;
> +	input->close = max7360_keypad_close;
> +
> +	error = matrix_keypad_build_keymap(NULL, NULL,
> +					   MAX7360_MAX_KEY_ROWS,
> +					   MAX7360_MAX_KEY_COLS,
> +					   max7360_keypad->keycodes, input);
> +	if (error)
> +		return dev_err_probe(&pdev->dev, error,
> +				     "Failed to build keymap\n");
> +
> +	input_set_capability(input, EV_MSC, MSC_SCAN);
> +	if (autorepeat)
> +		__set_bit(EV_REP, input->evbit);
> +
> +	input_set_drvdata(input, max7360_keypad);
> +
> +	error = devm_request_threaded_irq(&pdev->dev, irq, NULL,
> +					  max7360_keypad_irq,
> +					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +					  "max7360-keypad", max7360_keypad);
> +	if (error)
> +		return dev_err_probe(&pdev->dev, error,
> +				     "Failed to register interrupt: %d\n",
> +				     error);

No need to duplicate error.

> +
> +	error = input_register_device(input);
> +	if (error)
> +		return dev_err_probe(&pdev->dev, error,
> +				     "Could not register input device: %d\n",
> +				     error);

No need to duplicate error.

> +
> +	platform_set_drvdata(pdev, max7360_keypad);
> +
> +	error = max7360_keypad_hw_init(max7360_keypad);
> +	if (error)
> +		return dev_err_probe(&pdev->dev, error,
> +				     "Failed to initialize max7360 keypad\n");
> +
> +	device_init_wakeup(&pdev->dev, true);
> +	error = dev_pm_set_wake_irq(&pdev->dev, irq);
> +	if (error)
> +		dev_warn(&pdev->dev, "Failed to set up wakeup irq: %d\n",
> +			 error);
> +
> +	return 0;
> +}

CJ