hwmon: (dell-smm-hwmon) Use platform device

Register a platform device for usage with
devm_hwmon_device_register_with_groups since
the platform device is necessary for future
changes.
Also fix some checkpatch warnings.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20210728221557.8891-2-W_Armin@gmx.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/dell-smm-hwmon.c

@@ -14,7 +14,9 @@
 
 #include <linux/cpu.h>
 #include <linux/delay.h>
+#include <linux/err.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/proc_fs.h>
@@ -896,7 +898,7 @@ static const struct attribute_group i8k_group = {
 };
 __ATTRIBUTE_GROUPS(i8k);
 
-static int __init i8k_init_hwmon(void)
+static int __init dell_smm_init_hwmon(struct device *dev)
 {
 	int err;
 
@@ -956,15 +958,9 @@ static int __init i8k_init_hwmon(void)
 	if (err >= 0)
 		i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
 
-	i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
-							  NULL, i8k_groups);
-	if (IS_ERR(i8k_hwmon_dev)) {
-		err = PTR_ERR(i8k_hwmon_dev);
-		i8k_hwmon_dev = NULL;
-		pr_err("hwmon registration failed (%d)\n", err);
-		return err;
-	}
-	return 0;
+	i8k_hwmon_dev = devm_hwmon_device_register_with_groups(dev, "dell_smm", NULL, i8k_groups);
+
+	return PTR_ERR_OR_ZERO(i8k_hwmon_dev);
 }
 
 struct i8k_config_data {
@@ -1221,28 +1217,11 @@ static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = {
 	{ }
 };
 
-/*
- * Probe for the presence of a supported laptop.
- */
-static int __init i8k_probe(void)
+static int __init dell_smm_probe(struct platform_device *pdev)
 {
 	const struct dmi_system_id *id, *fan_control;
 	int fan, ret;
 
-	/*
-	 * Get DMI information
-	 */
-	if (!dmi_check_system(i8k_dmi_table)) {
-		if (!ignore_dmi && !force)
-			return -ENODEV;
-
-		pr_info("not running on a supported Dell system.\n");
-		pr_info("vendor=%s, model=%s, version=%s\n",
-			i8k_get_dmi_data(DMI_SYS_VENDOR),
-			i8k_get_dmi_data(DMI_PRODUCT_NAME),
-			i8k_get_dmi_data(DMI_BIOS_VERSION));
-	}
-
 	if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
 		pr_warn("broken Dell BIOS detected, disallow fan support\n");
 		if (!force)
@@ -1255,21 +1234,11 @@ static int __init i8k_probe(void)
 			disallow_fan_type_call = true;
 	}
 
-	strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
+	strscpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
 		sizeof(bios_version));
-	strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+	strscpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
 		sizeof(bios_machineid));
 
-	/*
-	 * Get SMM Dell signature
-	 */
-	if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
-	    i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
-		pr_err("unable to get SMM Dell signature\n");
-		if (!force)
-			return -ENODEV;
-	}
-
 	/*
 	 * Set fan multiplier and maximal fan speed from dmi config
 	 * Values specified in module parameters override values from dmi
@@ -1277,6 +1246,7 @@ static int __init i8k_probe(void)
 	id = dmi_first_match(i8k_dmi_table);
 	if (id && id->driver_data) {
 		const struct i8k_config_data *conf = id->driver_data;
+
 		if (!fan_mult && conf->fan_mult)
 			fan_mult = conf->fan_mult;
 		if (!fan_max && conf->fan_max)
@@ -1313,29 +1283,70 @@ static int __init i8k_probe(void)
 		i8k_fan_mult = fan_mult;
 	}
 
+	ret = dell_smm_init_hwmon(&pdev->dev);
+	if (ret)
+		return ret;
+
+	i8k_init_procfs();
+
 	return 0;
 }
 
+static int dell_smm_remove(struct platform_device *pdev)
+{
+	i8k_exit_procfs();
+
+	return 0;
+}
+
+static struct platform_driver dell_smm_driver = {
+	.driver		= {
+		.name	= KBUILD_MODNAME,
+	},
+	.remove		= dell_smm_remove,
+};
+
+static struct platform_device *dell_smm_device;
+
+/*
+ * Probe for the presence of a supported laptop.
+ */
 static int __init i8k_init(void)
 {
-	int err;
+	/*
+	 * Get DMI information
+	 */
+	if (!dmi_check_system(i8k_dmi_table)) {
+		if (!ignore_dmi && !force)
+			return -ENODEV;
 
-	/* Are we running on an supported laptop? */
-	if (i8k_probe())
-		return -ENODEV;
+		pr_info("not running on a supported Dell system.\n");
+		pr_info("vendor=%s, model=%s, version=%s\n",
+			i8k_get_dmi_data(DMI_SYS_VENDOR),
+			i8k_get_dmi_data(DMI_PRODUCT_NAME),
+			i8k_get_dmi_data(DMI_BIOS_VERSION));
+	}
 
-	err = i8k_init_hwmon();
-	if (err)
-		return err;
+	/*
+	 * Get SMM Dell signature
+	 */
+	if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
+	    i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
+		pr_err("unable to get SMM Dell signature\n");
+		if (!force)
+			return -ENODEV;
+	}
 
-	i8k_init_procfs();
-	return 0;
+	dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL,
+						 0);
+
+	return PTR_ERR_OR_ZERO(dell_smm_device);
 }
 
 static void __exit i8k_exit(void)
 {
-	hwmon_device_unregister(i8k_hwmon_dev);
-	i8k_exit_procfs();
+	platform_device_unregister(dell_smm_device);
+	platform_driver_unregister(&dell_smm_driver);
 }
 
 module_init(i8k_init);