Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:
 - ltc2945: Don't unecessarily crash kernel on implementation error
 - vexpress: Fix 'name' and 'label' attributes

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (ltc2945) Don't crash the kernel unnecessarily
  hwmon: (vexpress) Avoid creating non-existing attributes
  hwmon: (vexpress) Use legal hwmon device names

2 files changed, 74 insertions, 15 deletions

diff --git a/drivers/hwmon/ltc2945.c b/drivers/hwmon/ltc2945.c
index c104cc32989d..c9cddf5f056b 100644
--- a/drivers/hwmon/ltc2945.c
+++ b/drivers/hwmon/ltc2945.c
@@ -1,4 +1,4 @@
-/*
+    /*
  * Driver for Linear Technology LTC2945 I2C Power Monitor
  *
  * Copyright (c) 2014 Guenter Roeck
@@ -314,8 +314,8 @@ static ssize_t ltc2945_reset_history(struct device *dev,
                 reg = LTC2945_MAX_ADIN_H;
                 break;
         default:
-                BUG();
-                break;
+                WARN_ONCE(1, "Bad register: 0x%x\n", reg);
+                return -EINVAL;
         }
         /* Reset maximum */
         ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
diff --git a/drivers/hwmon/vexpress.c b/drivers/hwmon/vexpress.c
index d867e6bb2be1..8242b75d96c8 100644
--- a/drivers/hwmon/vexpress.c
+++ b/drivers/hwmon/vexpress.c
@@ -27,15 +27,15 @@
 struct vexpress_hwmon_data {
         struct device *hwmon_dev;
         struct vexpress_config_func *func;
+        const char *name;
 };
 
 static ssize_t vexpress_hwmon_name_show(struct device *dev,
                 struct device_attribute *dev_attr, char *buffer)
 {
-        const char *compatible = of_get_property(dev->of_node, "compatible",
-                        NULL);
+        struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
 
-        return sprintf(buffer, "%s\n", compatible);
+        return sprintf(buffer, "%s\n", data->name);
 }
 
 static ssize_t vexpress_hwmon_label_show(struct device *dev,
@@ -43,9 +43,6 @@ static ssize_t vexpress_hwmon_label_show(struct device *dev,
 {
         const char *label = of_get_property(dev->of_node, "label", NULL);
 
-        if (!label)
-                return -ENOENT;
-
         return snprintf(buffer, PAGE_SIZE, "%s\n", label);
 }
 
@@ -84,6 +81,20 @@ static ssize_t vexpress_hwmon_u64_show(struct device *dev,
                         to_sensor_dev_attr(dev_attr)->index));
 }
 
+static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
+                struct attribute *attr, int index)
+{
+        struct device *dev = kobj_to_dev(kobj);
+        struct device_attribute *dev_attr = container_of(attr,
+                                struct device_attribute, attr);
+
+        if (dev_attr->show == vexpress_hwmon_label_show &&
+                        !of_get_property(dev->of_node, "label", NULL))
+                return 0;
+
+        return attr->mode;
+}
+
 static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);
 
 #define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr)   \
@@ -94,14 +105,27 @@ struct attribute *vexpress_hwmon_attrs_##_name[] = {		\
         NULL                                                    \
 }
 
+struct vexpress_hwmon_type {
+        const char *name;
+        const struct attribute_group **attr_groups;
+};
+
 #if !defined(CONFIG_REGULATOR_VEXPRESS)
 static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
                 NULL, 1000);
 static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
 static struct attribute_group vexpress_hwmon_group_volt = {
+        .is_visible = vexpress_hwmon_attr_is_visible,
         .attrs = vexpress_hwmon_attrs_volt,
 };
+static struct vexpress_hwmon_type vexpress_hwmon_volt = {
+        .name = "vexpress_volt",
+        .attr_groups = (const struct attribute_group *[]) {
+                &vexpress_hwmon_group_volt,
+                NULL,
+        },
+};
 #endif
 
 static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
@@ -109,52 +133,84 @@ static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
                 NULL, 1000);
 static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
 static struct attribute_group vexpress_hwmon_group_amp = {
+        .is_visible = vexpress_hwmon_attr_is_visible,
         .attrs = vexpress_hwmon_attrs_amp,
 };
+static struct vexpress_hwmon_type vexpress_hwmon_amp = {
+        .name = "vexpress_amp",
+        .attr_groups = (const struct attribute_group *[]) {
+                &vexpress_hwmon_group_amp,
+                NULL
+        },
+};
 
 static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
                 NULL, 1000);
 static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
 static struct attribute_group vexpress_hwmon_group_temp = {
+        .is_visible = vexpress_hwmon_attr_is_visible,
         .attrs = vexpress_hwmon_attrs_temp,
 };
+static struct vexpress_hwmon_type vexpress_hwmon_temp = {
+        .name = "vexpress_temp",
+        .attr_groups = (const struct attribute_group *[]) {
+                &vexpress_hwmon_group_temp,
+                NULL
+        },
+};
 
 static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
                 NULL, 1);
 static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
 static struct attribute_group vexpress_hwmon_group_power = {
+        .is_visible = vexpress_hwmon_attr_is_visible,
         .attrs = vexpress_hwmon_attrs_power,
 };
+static struct vexpress_hwmon_type vexpress_hwmon_power = {
+        .name = "vexpress_power",
+        .attr_groups = (const struct attribute_group *[]) {
+                &vexpress_hwmon_group_power,
+                NULL
+        },
+};
 
 static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
 static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
                 NULL, 1);
 static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
 static struct attribute_group vexpress_hwmon_group_energy = {
+        .is_visible = vexpress_hwmon_attr_is_visible,
         .attrs = vexpress_hwmon_attrs_energy,
 };
+static struct vexpress_hwmon_type vexpress_hwmon_energy = {
+        .name = "vexpress_energy",
+        .attr_groups = (const struct attribute_group *[]) {
+                &vexpress_hwmon_group_energy,
+                NULL
+        },
+};
 
 static struct of_device_id vexpress_hwmon_of_match[] = {
 #if !defined(CONFIG_REGULATOR_VEXPRESS)
         {
                 .compatible = "arm,vexpress-volt",
-                .data = &vexpress_hwmon_group_volt,
+                .data = &vexpress_hwmon_volt,
         },
 #endif
         {
                 .compatible = "arm,vexpress-amp",
-                .data = &vexpress_hwmon_group_amp,
+                .data = &vexpress_hwmon_amp,
         }, {
                 .compatible = "arm,vexpress-temp",
-                .data = &vexpress_hwmon_group_temp,
+                .data = &vexpress_hwmon_temp,
         }, {
                 .compatible = "arm,vexpress-power",
-                .data = &vexpress_hwmon_group_power,
+                .data = &vexpress_hwmon_power,
         }, {
                 .compatible = "arm,vexpress-energy",
-                .data = &vexpress_hwmon_group_energy,
+                .data = &vexpress_hwmon_energy,
         },
         {}
 };
@@ -165,6 +221,7 @@ static int vexpress_hwmon_probe(struct platform_device *pdev)
         int err;
         const struct of_device_id *match;
         struct vexpress_hwmon_data *data;
+        const struct vexpress_hwmon_type *type;
 
         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
         if (!data)
@@ -174,12 +231,14 @@ static int vexpress_hwmon_probe(struct platform_device *pdev)
         match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
         if (!match)
                 return -ENODEV;
+        type = match->data;
+        data->name = type->name;
 
         data->func = vexpress_config_func_get_by_dev(&pdev->dev);
         if (!data->func)
                 return -ENODEV;
 
-        err = sysfs_create_group(&pdev->dev.kobj, match->data);
+        err = sysfs_create_groups(&pdev->dev.kobj, type->attr_groups);
         if (err)
                 goto error;