Re: [lm-sensors] [RFT PATCH] hwmon: (k10temp) Convert to devm_hwmon_device_register_with_groups

[Clemens Ladisch <clemens@ladisch.de>]

Guenter Roeck wrote:
> Use devm_hwmon_device_register_with_groups() to simplify the code
> and reduce code size.
>
> Cc: Clemens Ladisch <clemens@ladisch.de>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
> Would be great if someone with access to hardware can test this patch
> and let me know if it works. Thanks!

The {name,temp*} files moved from /sys/devices/pci0000:00/0000:00:18.3/ to
/sys/devices/pci0000:00/0000:00:18.3/hwmon/hwmon3/.  (And my own little script
of course does not use libsensors.)


Tested-by: Clemens Ladisch <clemens@ladisch.de>


>  drivers/hwmon/k10temp.c | 124 +++++++++++++++++++-----------------------------
>  1 file changed, 48 insertions(+), 76 deletions(-)
>
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index 730bdf7..1e7bdcd 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -77,7 +77,7 @@ static ssize_t show_temp(struct device *dev,
>  			 struct device_attribute *attr, char *buf)
>  {
>  	u32 regval;
> -	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct pci_dev *pdev = dev_get_drvdata(dev);
>
>  	if (boot_cpu_data.x86 = 0x15 && boot_cpu_data.x86_model = 0x60) {
>  		amd_nb_smu_index_read(pdev, PCI_DEVFN(0, 0),
> @@ -103,7 +103,7 @@ static ssize_t show_temp_crit(struct device *dev,
>  	u32 regval;
>  	int value;
>
> -	pci_read_config_dword(to_pci_dev(dev),
> +	pci_read_config_dword(dev_get_drvdata(dev),
>  			      REG_HARDWARE_THERMAL_CONTROL, &regval);
>  	value = ((regval >> 16) & 0x7f) * 500 + 52000;
>  	if (show_hyst)
> @@ -111,17 +111,43 @@ static ssize_t show_temp_crit(struct device *dev,
>  	return sprintf(buf, "%d\n", value);
>  }
>
> -static ssize_t show_name(struct device *dev,
> -			 struct device_attribute *attr, char *buf)
> -{
> -	return sprintf(buf, "k10temp\n");
> -}
> -
>  static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
>  static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
>  static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
>  static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
> -static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
> +
> +static umode_t k10temp_is_visible(struct kobject *kobj,
> +				  struct attribute *attr, int index)
> +{
> +	struct device *dev = container_of(kobj, struct device, kobj);
> +	struct pci_dev *pdev = dev_get_drvdata(dev);
> +
> +	if (index >= 2) {
> +		u32 reg_caps, reg_htc;
> +
> +		pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES,
> +				      &reg_caps);
> +		pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL,
> +				      &reg_htc);
> +		if (!(reg_caps & NB_CAP_HTC) || !(reg_htc & HTC_ENABLE))
> +			return 0;
> +	}
> +	return attr->mode;
> +}
> +
> +static struct attribute *k10temp_attrs[] = {
> +	&dev_attr_temp1_input.attr,
> +	&dev_attr_temp1_max.attr,
> +	&sensor_dev_attr_temp1_crit.dev_attr.attr,
> +	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group k10temp_group = {
> +	.attrs = k10temp_attrs,
> +	.is_visible = k10temp_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(k10temp);
>
>  static bool has_erratum_319(struct pci_dev *pdev)
>  {
> @@ -160,76 +186,23 @@ static bool has_erratum_319(struct pci_dev *pdev)
>  static int k10temp_probe(struct pci_dev *pdev,
>  				   const struct pci_device_id *id)
>  {
> -	struct device *hwmon_dev;
> -	u32 reg_caps, reg_htc;
>  	int unreliable = has_erratum_319(pdev);
> -	int err;
> -
> -	if (unreliable && !force) {
> -		dev_err(&pdev->dev,
> -			"unreliable CPU thermal sensor; monitoring disabled\n");
> -		err = -ENODEV;
> -		goto exit;
> -	}
> -
> -	err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
> -	if (err)
> -		goto exit;
> -	err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
> -	if (err)
> -		goto exit_remove;
> -
> -	pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
> -	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
> -	if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
> -		err = device_create_file(&pdev->dev,
> -				&sensor_dev_attr_temp1_crit.dev_attr);
> -		if (err)
> -			goto exit_remove;
> -		err = device_create_file(&pdev->dev,
> -				&sensor_dev_attr_temp1_crit_hyst.dev_attr);
> -		if (err)
> -			goto exit_remove;
> -	}
> -
> -	err = device_create_file(&pdev->dev, &dev_attr_name);
> -	if (err)
> -		goto exit_remove;
> -
> -	hwmon_dev = hwmon_device_register(&pdev->dev);
> -	if (IS_ERR(hwmon_dev)) {
> -		err = PTR_ERR(hwmon_dev);
> -		goto exit_remove;
> -	}
> -	pci_set_drvdata(pdev, hwmon_dev);
> +	struct device *dev = &pdev->dev;
> +	struct device *hwmon_dev;
>
> -	if (unreliable && force)
> -		dev_warn(&pdev->dev,
> +	if (unreliable) {
> +		if (!force) {
> +			dev_err(dev,
> +				"unreliable CPU thermal sensor; monitoring disabled\n");
> +			return -ENODEV;
> +		}
> +		dev_warn(dev,
>  			 "unreliable CPU thermal sensor; check erratum 319\n");
> -	return 0;
> -
> -exit_remove:
> -	device_remove_file(&pdev->dev, &dev_attr_name);
> -	device_remove_file(&pdev->dev, &dev_attr_temp1_input);
> -	device_remove_file(&pdev->dev, &dev_attr_temp1_max);
> -	device_remove_file(&pdev->dev,
> -			   &sensor_dev_attr_temp1_crit.dev_attr);
> -	device_remove_file(&pdev->dev,
> -			   &sensor_dev_attr_temp1_crit_hyst.dev_attr);
> -exit:
> -	return err;
> -}
> +	}
>
> -static void k10temp_remove(struct pci_dev *pdev)
> -{
> -	hwmon_device_unregister(pci_get_drvdata(pdev));
> -	device_remove_file(&pdev->dev, &dev_attr_name);
> -	device_remove_file(&pdev->dev, &dev_attr_temp1_input);
> -	device_remove_file(&pdev->dev, &dev_attr_temp1_max);
> -	device_remove_file(&pdev->dev,
> -			   &sensor_dev_attr_temp1_crit.dev_attr);
> -	device_remove_file(&pdev->dev,
> -			   &sensor_dev_attr_temp1_crit_hyst.dev_attr);
> +	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "k10temp", pdev,
> +							   k10temp_groups);
> +	return PTR_ERR_OR_ZERO(hwmon_dev);
>  }
>
>  static const struct pci_device_id k10temp_id_table[] = {
> @@ -250,7 +223,6 @@ static struct pci_driver k10temp_driver = {
>  	.name = "k10temp",
>  	.id_table = k10temp_id_table,
>  	.probe = k10temp_probe,
> -	.remove = k10temp_remove,
>  };
>
>  module_pci_driver(k10temp_driver);

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