hwmon: (lm87) Fix checkpatch issues

Fixed:
ERROR: do not use assignment in if condition
ERROR: space required after that close brace '}'
ERROR: space required after that ',' (ctx:VxV)
ERROR: spaces required around that '<' (ctx:VxV)
ERROR: trailing statements should be on next line
WARNING: line over 80 characters
WARNING: simple_strtol is obsolete, use kstrtol instead
WARNING: simple_strtoul is obsolete, use kstrtoul instead

Modify multi-line comments to follow Documentation/CodingStyle.

Not fixed everywhere (code complexity):
ERROR: do not use assignment in if condition

As a side effect of the changes made, attribute set functions now return an
error if an attempt is made to write non-numeric values. Previously, such
writes were interpreted as writing 0.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 174 insertions, 83 deletions

diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index 126d0cc42090..0216592a794b 100644
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -119,20 +119,21 @@ static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  * The LM87 uses signed 8-bit values for temperatures.
  */
 
-#define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
-#define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
+#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
+#define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
                                  (val) * 192 >= (scale) * 255 ? 255 : \
-                                 ((val) * 192 + (scale)/2) / (scale))
+                                 ((val) * 192 + (scale) / 2) / (scale))
 
 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
                                  (val) >= 126500 ? 127 : \
-                                 (((val) < 0 ? (val)-500 : (val)+500) / 1000))
+                                 (((val) < 0 ? (val) - 500 : \
+                                   (val) + 500) / 1000))
 
-#define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
-                                 (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
-#define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
-                                 (1350000 + (val)*(div) / 2) / ((val)*(div)))
+#define FAN_FROM_REG(reg, div)  ((reg) == 255 || (reg) == 0 ? 0 : \
+                                 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
+#define FAN_TO_REG(val, div)    ((val) * (div) * 255 <= 1350000 ? 255 : \
+                                 (1350000 + (val)*(div) / 2) / ((val) * (div)))
 
 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
 
@@ -232,19 +233,23 @@ static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 }
 
 #define show_in(offset) \
-static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_in##offset##_input(struct device *dev, \
+                                       struct device_attribute *attr, \
+                                       char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
                        data->in_scale[offset])); \
 } \
-static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_in##offset##_min(struct device *dev, \
+                                     struct device_attribute *attr, char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
                        data->in_scale[offset])); \
 } \
-static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_in##offset##_max(struct device *dev, \
+                                     struct device_attribute *attr, char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
@@ -261,44 +266,58 @@ show_in(5);
 show_in(6);
 show_in(7);
 
-static void set_in_min(struct device *dev, const char *buf, int nr)
+static ssize_t set_in_min(struct device *dev, const char *buf, int nr,
+                          size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
-        lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
-                         LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
+        lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
+                         LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
         mutex_unlock(&data->update_lock);
+        return count;
 }
 
-static void set_in_max(struct device *dev, const char *buf, int nr)
+static ssize_t set_in_max(struct device *dev, const char *buf, int nr,
+                          size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
-        lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
-                         LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
+        lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
+                         LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
         mutex_unlock(&data->update_lock);
+        return count;
 }
 
 #define set_in(offset) \
-static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
-                const char *buf, size_t count) \
+static ssize_t set_in##offset##_min(struct device *dev, \
+                                    struct device_attribute *attr, \
+                                    const char *buf, size_t count) \
 { \
-        set_in_min(dev, buf, offset); \
-        return count; \
+        return set_in_min(dev, buf, offset, count); \
 } \
-static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
-                const char *buf, size_t count) \
+static ssize_t set_in##offset##_max(struct device *dev, \
+                                    struct device_attribute *attr, \
+                                    const char *buf, size_t count) \
 { \
-        set_in_max(dev, buf, offset); \
-        return count; \
+        return set_in_max(dev, buf, offset, count); \
 } \
 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
                 show_in##offset##_min, set_in##offset##_min); \
@@ -314,63 +333,85 @@ set_in(6);
 set_in(7);
 
 #define show_temp(offset) \
-static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_temp##offset##_input(struct device *dev, \
+                                         struct device_attribute *attr, \
+                                         char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset - 1])); \
 } \
-static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_temp##offset##_low(struct device *dev, \
+                                       struct device_attribute *attr, \
+                                       char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
+        return sprintf(buf, "%d\n", \
+                       TEMP_FROM_REG(data->temp_low[offset - 1])); \
 } \
-static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_temp##offset##_high(struct device *dev, \
+                                        struct device_attribute *attr, \
+                                        char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
-}\
+        return sprintf(buf, "%d\n", \
+                       TEMP_FROM_REG(data->temp_high[offset - 1])); \
+} \
 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
                 show_temp##offset##_input, NULL);
 show_temp(1);
 show_temp(2);
 show_temp(3);
 
-static void set_temp_low(struct device *dev, const char *buf, int nr)
+static ssize_t set_temp_low(struct device *dev, const char *buf, int nr,
+                            size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->temp_low[nr] = TEMP_TO_REG(val);
         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
         mutex_unlock(&data->update_lock);
+        return count;
 }
 
-static void set_temp_high(struct device *dev, const char *buf, int nr)
+static ssize_t set_temp_high(struct device *dev, const char *buf, int nr,
+                             size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->temp_high[nr] = TEMP_TO_REG(val);
         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
         mutex_unlock(&data->update_lock);
+        return count;
 }
 
 #define set_temp(offset) \
-static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
-                const char *buf, size_t count) \
+static ssize_t set_temp##offset##_low(struct device *dev, \
+                                      struct device_attribute *attr, \
+                                      const char *buf, size_t count) \
 { \
-        set_temp_low(dev, buf, offset-1); \
-        return count; \
+        return set_temp_low(dev, buf, offset - 1, count); \
 } \
-static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
-                const char *buf, size_t count) \
+static ssize_t set_temp##offset##_high(struct device *dev, \
+                                       struct device_attribute *attr, \
+                                       const char *buf, size_t count) \
 { \
-        set_temp_high(dev, buf, offset-1); \
-        return count; \
+        return set_temp_high(dev, buf, offset - 1, count); \
 } \
 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
                 show_temp##offset##_high, set_temp##offset##_high); \
@@ -380,13 +421,15 @@ set_temp(1);
 set_temp(2);
 set_temp(3);
 
-static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_temp_crit_int(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
 {
         struct lm87_data *data = lm87_update_device(dev);
         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
 }
 
-static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_temp_crit_ext(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
 {
         struct lm87_data *data = lm87_update_device(dev);
         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
@@ -397,63 +440,92 @@ static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
 
 #define show_fan(offset) \
-static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_fan##offset##_input(struct device *dev, \
+                                        struct device_attribute *attr, \
+                                        char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
-                       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
+        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset - 1], \
+                       FAN_DIV_FROM_REG(data->fan_div[offset - 1]))); \
 } \
-static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_fan##offset##_min(struct device *dev, \
+                                      struct device_attribute *attr, \
+                                      char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
-                       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
+        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset - 1], \
+                       FAN_DIV_FROM_REG(data->fan_div[offset - 1]))); \
 } \
-static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_fan##offset##_div(struct device *dev, \
+                                      struct device_attribute *attr, \
+                                      char *buf) \
 { \
         struct lm87_data *data = lm87_update_device(dev); \
-        return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
+        return sprintf(buf, "%d\n", \
+                       FAN_DIV_FROM_REG(data->fan_div[offset - 1])); \
 } \
 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
                 show_fan##offset##_input, NULL);
 show_fan(1);
 show_fan(2);
 
-static void set_fan_min(struct device *dev, const char *buf, int nr)
+static ssize_t set_fan_min(struct device *dev, const char *buf, int nr,
+                           size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->fan_min[nr] = FAN_TO_REG(val,
                             FAN_DIV_FROM_REG(data->fan_div[nr]));
         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
         mutex_unlock(&data->update_lock);
+        return count;
 }
 
-/* Note: we save and restore the fan minimum here, because its value is
-   determined in part by the fan clock divider.  This follows the principle
-   of least surprise; the user doesn't expect the fan minimum to change just
-   because the divider changed. */
+/*
+ * Note: we save and restore the fan minimum here, because its value is
+ * determined in part by the fan clock divider.  This follows the principle
+ * of least surprise; the user doesn't expect the fan minimum to change just
+ * because the divider changed.
+ */
 static ssize_t set_fan_div(struct device *dev, const char *buf,
                 size_t count, int nr)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
         unsigned long min;
         u8 reg;
 
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
+
         mutex_lock(&data->update_lock);
         min = FAN_FROM_REG(data->fan_min[nr],
                            FAN_DIV_FROM_REG(data->fan_div[nr]));
 
         switch (val) {
-        case 1: data->fan_div[nr] = 0; break;
-        case 2: data->fan_div[nr] = 1; break;
-        case 4: data->fan_div[nr] = 2; break;
-        case 8: data->fan_div[nr] = 3; break;
+        case 1:
+                data->fan_div[nr] = 0;
+                break;
+        case 2:
+                data->fan_div[nr] = 1;
+                break;
+        case 4:
+                data->fan_div[nr] = 2;
+                break;
+        case 8:
+                data->fan_div[nr] = 3;
+                break;
         default:
                 mutex_unlock(&data->update_lock);
                 return -EINVAL;
@@ -479,16 +551,17 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
 }
 
 #define set_fan(offset) \
-static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
-                size_t count) \
+static ssize_t set_fan##offset##_min(struct device *dev, \
+                                     struct device_attribute *attr, \
+                                     const char *buf, size_t count) \
 { \
-        set_fan_min(dev, buf, offset-1); \
-        return count; \
+        return set_fan_min(dev, buf, offset - 1, count); \
 } \
-static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
-                size_t count) \
+static ssize_t set_fan##offset##_div(struct device *dev, \
+                                     struct device_attribute *attr, \
+                                     const char *buf, size_t count) \
 { \
-        return set_fan_div(dev, buf, count, offset-1); \
+        return set_fan_div(dev, buf, count, offset - 1); \
 } \
 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
                 show_fan##offset##_min, set_fan##offset##_min); \
@@ -497,43 +570,60 @@ static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 set_fan(1);
 set_fan(2);
 
-static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
+                           char *buf)
 {
         struct lm87_data *data = lm87_update_device(dev);
         return sprintf(buf, "%d\n", data->alarms);
 }
 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 
-static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
+                        char *buf)
 {
         struct lm87_data *data = lm87_update_device(dev);
         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 }
 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 
-static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
+                        char *buf)
 {
         struct lm87_data *data = dev_get_drvdata(dev);
         return sprintf(buf, "%d\n", data->vrm);
 }
-static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
+                       const char *buf, size_t count)
 {
         struct lm87_data *data = dev_get_drvdata(dev);
-        data->vrm = simple_strtoul(buf, NULL, 10);
+        unsigned long val;
+        int err;
+
+        err = kstrtoul(buf, 10, &val);
+        if (err)
+                return err;
+        data->vrm = val;
         return count;
 }
 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 
-static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
+                         char *buf)
 {
         struct lm87_data *data = lm87_update_device(dev);
         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 }
-static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_aout(struct device *dev, struct device_attribute *attr,
+                        const char *buf, size_t count)
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct lm87_data *data = i2c_get_clientdata(client);
-        long val = simple_strtol(buf, NULL, 10);
+        long val;
+        int err;
+
+        err = kstrtol(buf, 10, &val);
+        if (err)
+                return err;
 
         mutex_lock(&data->update_lock);
         data->aout = AOUT_TO_REG(val);
@@ -721,7 +811,8 @@ static int lm87_probe(struct i2c_client *new_client,
         data->in_scale[7] = 1875;
 
         /* Register sysfs hooks */
-        if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
+        err = sysfs_create_group(&new_client->dev.kobj, &lm87_group);
+        if (err)
                 goto exit_free;
 
         if (data->channel & CHAN_NO_FAN(0)) {