Re: [PATCH v6 6/9] platform/x86: serial-multi-instantiate: Reorganize I2C functions

[Hans de Goede]

Hi,

On 1/21/22 18:24, Stefan Binding wrote:
> From: Lucas Tanure <tanureal@xxxxxxxxxxxxxxxxxxxxx>
> 
> Reorganize I2C functions to accommodate SPI support
> Split the probe and factor out parts of the code
> that will be used in the SPI support
> Also switched from strlcpy() to strscpy()
> 
> Signed-off-by: Lucas Tanure <tanureal@xxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>

Regards,

Hans


> ---
>  .../platform/x86/serial-multi-instantiate.c   | 144 +++++++++++-------
>  1 file changed, 90 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
> index 33cbb0caed33..4cd6d72a0741 100644
> --- a/drivers/platform/x86/serial-multi-instantiate.c
> +++ b/drivers/platform/x86/serial-multi-instantiate.c
> @@ -29,96 +29,132 @@ struct smi_instance {
>  
>  struct smi {
>  	int i2c_num;
> -	struct i2c_client *i2c_devs[];
> +	struct i2c_client **i2c_devs;
>  };
>  
> -static int smi_probe(struct platform_device *pdev)
> +static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,
> +		       const struct smi_instance *inst)
> +{
> +	int ret;
> +
> +	switch (inst->flags & IRQ_RESOURCE_TYPE) {
> +	case IRQ_RESOURCE_GPIO:
> +		ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
> +		break;
> +	case IRQ_RESOURCE_APIC:
> +		ret = platform_get_irq(pdev, inst->irq_idx);
> +		break;
> +	default:
> +		return 0;
> +	}
> +
> +	if (ret < 0)
> +		dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d: %d\n",
> +			      inst->irq_idx, ret);
> +
> +	return ret;
> +}
> +
> +static void smi_devs_unregister(struct smi *smi)
> +{
> +	while (smi->i2c_num > 0)
> +		i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]);
> +}
> +
> +/**
> + * smi_i2c_probe - Instantiate multiple I2C devices from inst array
> + * @pdev:	Platform device
> + * @adev:	ACPI device
> + * @smi:	Internal struct for Serial multi instantiate driver
> + * @inst_array:	Array of instances to probe
> + *
> + * Returns the number of I2C devices instantiate, Zero if none is found or a negative error code.
> + */
> +static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi,
> +			 const struct smi_instance *inst_array)
>  {
>  	struct i2c_board_info board_info = {};
> -	const struct smi_instance *inst;
>  	struct device *dev = &pdev->dev;
> -	struct acpi_device *adev;
> -	struct smi *smi;
>  	char name[32];
> -	int i, ret;
> +	int i, ret, count;
>  
> -	inst = device_get_match_data(dev);
> -	if (!inst) {
> -		dev_err(dev, "Error ACPI match data is missing\n");
> -		return -ENODEV;
> -	}
> -
> -	adev = ACPI_COMPANION(dev);
> -
> -	/* Count number of clients to instantiate */
>  	ret = i2c_acpi_client_count(adev);
>  	if (ret < 0)
>  		return ret;
> +	else if (!ret)
> +		return -ENODEV;
>  
> -	smi = devm_kmalloc(dev, struct_size(smi, i2c_devs, ret), GFP_KERNEL);
> -	if (!smi)
> -		return -ENOMEM;
> +	count = ret;
>  
> -	smi->i2c_num = ret;
> +	smi->i2c_devs = devm_kcalloc(dev, count, sizeof(*smi->i2c_devs), GFP_KERNEL);
> +	if (!smi->i2c_devs)
> +		return -ENOMEM;
>  
> -	for (i = 0; i < smi->i2c_num && inst[i].type; i++) {
> +	for (i = 0; i < count && inst_array[i].type; i++) {
>  		memset(&board_info, 0, sizeof(board_info));
> -		strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
> -		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
> +		strscpy(board_info.type, inst_array[i].type, I2C_NAME_SIZE);
> +		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i);
>  		board_info.dev_name = name;
> -		switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
> -		case IRQ_RESOURCE_GPIO:
> -			ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
> -			if (ret < 0) {
> -				dev_err(dev, "Error requesting irq at index %d: %d\n",
> -						inst[i].irq_idx, ret);
> -				goto error;
> -			}
> -			board_info.irq = ret;
> -			break;
> -		case IRQ_RESOURCE_APIC:
> -			ret = platform_get_irq(pdev, inst[i].irq_idx);
> -			if (ret < 0) {
> -				dev_dbg(dev, "Error requesting irq at index %d: %d\n",
> -					inst[i].irq_idx, ret);
> -				goto error;
> -			}
> -			board_info.irq = ret;
> -			break;
> -		default:
> -			board_info.irq = 0;
> -			break;
> -		}
> +
> +		ret = smi_get_irq(pdev, adev, &inst_array[i]);
> +		if (ret < 0)
> +			goto error;
> +		board_info.irq = ret;
> +
>  		smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
>  		if (IS_ERR(smi->i2c_devs[i])) {
>  			ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]),
>  					    "Error creating i2c-client, idx %d\n", i);
>  			goto error;
>  		}
> +		smi->i2c_num++;
>  	}
> -	if (i < smi->i2c_num) {
> -		dev_err(dev, "Error finding driver, idx %d\n", i);
> +	if (smi->i2c_num < count) {
> +		dev_dbg(dev, "Error finding driver, idx %d\n", i);
>  		ret = -ENODEV;
>  		goto error;
>  	}
>  
> -	platform_set_drvdata(pdev, smi);
> -	return 0;
> +	dev_info(dev, "Instantiated %d I2C devices.\n", smi->i2c_num);
>  
> +	return 0;
>  error:
> -	while (--i >= 0)
> -		i2c_unregister_device(smi->i2c_devs[i]);
> +	smi_devs_unregister(smi);
>  
>  	return ret;
>  }
>  
> +static int smi_probe(struct platform_device *pdev)
> +{
> +	const struct smi_instance *inst_array;
> +	struct device *dev = &pdev->dev;
> +	struct acpi_device *adev;
> +	struct smi *smi;
> +
> +	adev = ACPI_COMPANION(dev);
> +	if (!adev)
> +		return -ENODEV;
> +
> +	inst_array = device_get_match_data(dev);
> +	if (!inst_array) {
> +		dev_dbg(dev, "Error ACPI match data is missing\n");
> +		return -ENODEV;
> +	}
> +
> +	smi = devm_kzalloc(dev, sizeof(*smi), GFP_KERNEL);
> +	if (!smi)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, smi);
> +
> +	return smi_i2c_probe(pdev, adev, smi, inst_array);
> +}
> +
>  static int smi_remove(struct platform_device *pdev)
>  {
>  	struct smi *smi = platform_get_drvdata(pdev);
> -	int i;
>  
> -	for (i = 0; i < smi->i2c_num; i++)
> -		i2c_unregister_device(smi->i2c_devs[i]);
> +	smi_devs_unregister(smi);
>  
>  	return 0;
>  }
>