hwmon: (lm85) Misc cleanups

Misc cleanups to the lm85 hardware monitoring driver:
* Mark constant arrays as const.
* Remove useless masks.
* Have lm85_write_value return void - nobody is checking the returned
  value anyway and in some cases it was plain wrong.
* Remove useless initializations.
* Rename new_client to client in lm85_detect.
* Replace cascaded if/else with a switch/case in lm85_detect.
* Group similar loops in lm85_update_device.
* Remove legacy comments.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Juerg Haefliger <juergh at gmail.com>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

1 files changed, 67 insertions, 84 deletions

diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 645b98c187c2..c7e10af0173f 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -110,7 +110,7 @@ I2C_CLIENT_INSMOD_6(lm85b, lm85c, adm1027, adt7463, emc6d100, emc6d102);
  */
 
 /* IN are scaled acording to built-in resistors */
-static int lm85_scaling[] = {  /* .001 Volts */
+static const int lm85_scaling[] = {  /* .001 Volts */
         2500, 2250, 3300, 5000, 12000,
         3300, 1500, 1800 /*EMC6D100*/
 };
@@ -164,7 +164,7 @@ static inline u16 FAN_TO_REG(unsigned long val)
  */
 
 /* These are the zone temperature range encodings in .001 degree C */
-static int lm85_range_map[] = {
+static const int lm85_range_map[] = {
         2000, 2500, 3300, 4000, 5000, 6600, 8000, 10000,
         13300, 16000, 20000, 26600, 32000, 40000, 53300, 80000
 };
@@ -190,13 +190,8 @@ static int RANGE_TO_REG(int range)
 }
 #define RANGE_FROM_REG(val)     lm85_range_map[(val) & 0x0f]
 
-/* These are the Acoustic Enhancement, or Temperature smoothing encodings
- * NOTE: The enable/disable bit is INCLUDED in these encodings as the
- *       MSB (bit 3, value 8).  If the enable bit is 0, the encoded value
- *       is ignored, or set to 0.
- */
 /* These are the PWM frequency encodings */
-static int lm85_freq_map[] = { /* .1 Hz */
+static const int lm85_freq_map[] = { /* .1 Hz */
         100, 150, 230, 300, 380, 470, 620, 940
 };
 
@@ -209,7 +204,7 @@ static int FREQ_TO_REG(int freq)
         for (i = 0; i < 7; ++i)
                 if (freq <= lm85_freq_map[i])
                         break;
-        return i & 0x07;
+        return i;
 }
 #define FREQ_FROM_REG(val)      lm85_freq_map[(val) & 0x07]
 
@@ -225,8 +220,8 @@ static int FREQ_TO_REG(int freq)
  *     -2 -- PWM responds to manual control
  */
 
-static int lm85_zone_map[] = { 1, 2, 3, -1, 0, 23, 123, -2 };
-#define ZONE_FROM_REG(val)      lm85_zone_map[((val) >> 5) & 0x07]
+static const int lm85_zone_map[] = { 1, 2, 3, -1, 0, 23, 123, -2 };
+#define ZONE_FROM_REG(val)      lm85_zone_map[(val) >> 5]
 
 static int ZONE_TO_REG(int zone)
 {
@@ -237,7 +232,7 @@ static int ZONE_TO_REG(int zone)
                         break;
         if (i > 7)   /* Not found. */
                 i = 3;  /* Always 100% */
-        return (i & 0x07) << 5;
+        return i << 5;
 }
 
 #define HYST_TO_REG(val)        SENSORS_LIMIT(((val) + 500) / 1000, 0, 15)
@@ -321,7 +316,7 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
 static int lm85_detach_client(struct i2c_client *client);
 
 static int lm85_read_value(struct i2c_client *client, u8 reg);
-static int lm85_write_value(struct i2c_client *client, u8 reg, int value);
+static void lm85_write_value(struct i2c_client *client, u8 reg, int value);
 static struct lm85_data *lm85_update_device(struct device *dev);
 static void lm85_init_client(struct i2c_client *client);
 
@@ -1095,13 +1090,12 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
                 int kind)
 {
         int company, verstep;
-        struct i2c_client *new_client = NULL;
+        struct i2c_client *client;
         struct lm85_data *data;
         int err = 0;
-        const char *type_name = "";
+        const char *type_name;
 
-        if (!i2c_check_functionality(adapter,
-                                        I2C_FUNC_SMBUS_BYTE_DATA)) {
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
                 /* We need to be able to do byte I/O */
                 goto ERROR0;
         }
@@ -1115,21 +1109,20 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
                 goto ERROR0;
         }
 
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
-        new_client->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &lm85_driver;
-        new_client->flags = 0;
+        client = &data->client;
+        i2c_set_clientdata(client, data);
+        client->addr = address;
+        client->adapter = adapter;
+        client->driver = &lm85_driver;
 
         /* Now, we do the remaining detection. */
 
-        company = lm85_read_value(new_client, LM85_REG_COMPANY);
-        verstep = lm85_read_value(new_client, LM85_REG_VERSTEP);
+        company = lm85_read_value(client, LM85_REG_COMPANY);
+        verstep = lm85_read_value(client, LM85_REG_VERSTEP);
 
         dev_dbg(&adapter->dev, "Detecting device at %d,0x%02x with"
                 " COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
-                i2c_adapter_id(new_client->adapter), new_client->addr,
+                i2c_adapter_id(client->adapter), client->addr,
                 company, verstep);
 
         /* If auto-detecting, Determine the chip type. */
@@ -1196,56 +1189,65 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
         }
 
         /* Fill in the chip specific driver values */
-        if (kind == any_chip)
-                type_name = "lm85";
-        else if (kind == lm85b)
+        switch (kind) {
+        case lm85b:
                 type_name = "lm85b";
-        else if (kind == lm85c)
+                break;
+        case lm85c:
                 type_name = "lm85c";
-        else if (kind == adm1027)
+                break;
+        case adm1027:
                 type_name = "adm1027";
-        else if (kind == adt7463)
+                break;
+        case adt7463:
                 type_name = "adt7463";
-        else if (kind == emc6d100)
+                break;
+        case emc6d100:
                 type_name = "emc6d100";
-        else if (kind == emc6d102)
+                break;
+        case emc6d102:
                 type_name = "emc6d102";
-        strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
+                break;
+        default:
+                type_name = "lm85";
+        }
+        strlcpy(client->name, type_name, I2C_NAME_SIZE);
 
         /* Fill in the remaining client fields */
         data->type = kind;
-        data->valid = 0;
         mutex_init(&data->update_lock);
 
         /* Tell the I2C layer a new client has arrived */
-        if ((err = i2c_attach_client(new_client)))
+        err = i2c_attach_client(client);
+        if (err)
                 goto ERROR1;
 
         /* Set the VRM version */
         data->vrm = vid_which_vrm();
 
         /* Initialize the LM85 chip */
-        lm85_init_client(new_client);
+        lm85_init_client(client);
 
         /* Register sysfs hooks */
-        if ((err = sysfs_create_group(&new_client->dev.kobj, &lm85_group)))
+        err = sysfs_create_group(&client->dev.kobj, &lm85_group);
+        if (err)
                 goto ERROR2;
 
         /* The ADT7463 has an optional VRM 10 mode where pin 21 is used
            as a sixth digital VID input rather than an analog input. */
-        data->vid = lm85_read_value(new_client, LM85_REG_VID);
+        data->vid = lm85_read_value(client, LM85_REG_VID);
         if (!(kind == adt7463 && (data->vid & 0x80)))
-                if ((err = sysfs_create_group(&new_client->dev.kobj,
+                if ((err = sysfs_create_group(&client->dev.kobj,
                                         &lm85_group_in4)))
                         goto ERROR3;
 
         /* The EMC6D100 has 3 additional voltage inputs */
         if (kind == emc6d100)
-                if ((err = sysfs_create_group(&new_client->dev.kobj,
+                if ((err = sysfs_create_group(&client->dev.kobj,
                                         &lm85_group_in567)))
                         goto ERROR3;
 
-        data->hwmon_dev = hwmon_device_register(&new_client->dev);
+        data->hwmon_dev = hwmon_device_register(&client->dev);
         if (IS_ERR(data->hwmon_dev)) {
                 err = PTR_ERR(data->hwmon_dev);
                 goto ERROR3;
@@ -1255,12 +1257,12 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
 
         /* Error out and cleanup code */
  ERROR3:
-        sysfs_remove_group(&new_client->dev.kobj, &lm85_group);
-        sysfs_remove_group(&new_client->dev.kobj, &lm85_group_in4);
+        sysfs_remove_group(&client->dev.kobj, &lm85_group);
+        sysfs_remove_group(&client->dev.kobj, &lm85_group_in4);
         if (kind == emc6d100)
-                sysfs_remove_group(&new_client->dev.kobj, &lm85_group_in567);
+                sysfs_remove_group(&client->dev.kobj, &lm85_group_in567);
  ERROR2:
-        i2c_detach_client(new_client);
+        i2c_detach_client(client);
  ERROR1:
         kfree(data);
  ERROR0:
@@ -1307,10 +1309,8 @@ static int lm85_read_value(struct i2c_client *client, u8 reg)
         return res;
 }
 
-static int lm85_write_value(struct i2c_client *client, u8 reg, int value)
+static void lm85_write_value(struct i2c_client *client, u8 reg, int value)
 {
-        int res;
-
         switch (reg) {
         case LM85_REG_FAN(0):  /* Write WORD data */
         case LM85_REG_FAN(1):
@@ -1321,16 +1321,13 @@ static int lm85_write_value(struct i2c_client *client, u8 reg, int value)
         case LM85_REG_FAN_MIN(2):
         case LM85_REG_FAN_MIN(3):
         /* NOTE: ALARM is read only, so not included here */
-                res = i2c_smbus_write_byte_data(client, reg, value & 0xff);
-                res |= i2c_smbus_write_byte_data(client, reg + 1,
-                                                 (value >> 8) & 0xff);
+                i2c_smbus_write_byte_data(client, reg, value & 0xff);
+                i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
                 break;
         default:        /* Write BYTE data */
-                res = i2c_smbus_write_byte_data(client, reg, value);
+                i2c_smbus_write_byte_data(client, reg, value);
                 break;
         }
-
-        return res;
 }
 
 static void lm85_init_client(struct i2c_client *client)
@@ -1414,6 +1411,8 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                 for (i = 0; i <= 3; ++i) {
                         data->in[i] =
                             lm85_read_value(client, LM85_REG_IN(i));
+                        data->fan[i] =
+                            lm85_read_value(client, LM85_REG_FAN(i));
                 }
 
                 if (!(data->type == adt7463 && (data->vid & 0x80))) {
@@ -1421,17 +1420,9 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                                       LM85_REG_IN(4));
                 }
 
-                for (i = 0; i <= 3; ++i) {
-                        data->fan[i] =
-                            lm85_read_value(client, LM85_REG_FAN(i));
-                }
-
                 for (i = 0; i <= 2; ++i) {
                         data->temp[i] =
                             lm85_read_value(client, LM85_REG_TEMP(i));
-                }
-
-                for (i = 0; i <= 2; ++i) {
                         data->pwm[i] =
                             lm85_read_value(client, LM85_REG_PWM(i));
                 }
@@ -1462,13 +1453,13 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                                                    EMC6D102_REG_EXTEND_ADC4);
                         data->in_ext[0] = ext3 & 0x0f;
                         data->in_ext[1] = ext4 & 0x0f;
-                        data->in_ext[2] = (ext4 >> 4) & 0x0f;
-                        data->in_ext[3] = (ext3 >> 4) & 0x0f;
-                        data->in_ext[4] = (ext2 >> 4) & 0x0f;
+                        data->in_ext[2] = ext4 >> 4;
+                        data->in_ext[3] = ext3 >> 4;
+                        data->in_ext[4] = ext2 >> 4;
 
                         data->temp_ext[0] = ext1 & 0x0f;
                         data->temp_ext[1] = ext2 & 0x0f;
-                        data->temp_ext[2] = (ext1 >> 4) & 0x0f;
+                        data->temp_ext[2] = ext1 >> 4;
                 }
 
                 data->last_reading = jiffies;
@@ -1484,6 +1475,8 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                             lm85_read_value(client, LM85_REG_IN_MIN(i));
                         data->in_max[i] =
                             lm85_read_value(client, LM85_REG_IN_MAX(i));
+                        data->fan_min[i] =
+                            lm85_read_value(client, LM85_REG_FAN_MIN(i));
                 }
 
                 if (!(data->type == adt7463 && (data->vid & 0x80))) {
@@ -1502,25 +1495,19 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                         }
                 }
 
-                for (i = 0; i <= 3; ++i) {
-                        data->fan_min[i] =
-                            lm85_read_value(client, LM85_REG_FAN_MIN(i));
-                }
-
                 for (i = 0; i <= 2; ++i) {
+                        int val;
+
                         data->temp_min[i] =
                             lm85_read_value(client, LM85_REG_TEMP_MIN(i));
                         data->temp_max[i] =
                             lm85_read_value(client, LM85_REG_TEMP_MAX(i));
-                }
 
-                for (i = 0; i <= 2; ++i) {
-                        int val;
                         data->autofan[i].config =
                             lm85_read_value(client, LM85_REG_AFAN_CONFIG(i));
                         val = lm85_read_value(client, LM85_REG_AFAN_RANGE(i));
                         data->autofan[i].freq = val & 0x07;
-                        data->zone[i].range = (val >> 4) & 0x0f;
+                        data->zone[i].range = val >> 4;
                         data->autofan[i].min_pwm =
                             lm85_read_value(client, LM85_REG_AFAN_MINPWM(i));
                         data->zone[i].limit =
@@ -1535,11 +1522,11 @@ static struct lm85_data *lm85_update_device(struct device *dev)
                 data->autofan[2].min_off = (i & 0x80) != 0;
 
                 i = lm85_read_value(client, LM85_REG_AFAN_HYST1);
-                data->zone[0].hyst = (i >> 4) & 0x0f;
+                data->zone[0].hyst = i >> 4;
                 data->zone[1].hyst = i & 0x0f;
 
                 i = lm85_read_value(client, LM85_REG_AFAN_HYST2);
-                data->zone[2].hyst = (i >> 4) & 0x0f;
+                data->zone[2].hyst = i >> 4;
 
                 data->last_config = jiffies;
         }  /* last_config */
@@ -1562,14 +1549,10 @@ static void __exit sm_lm85_exit(void)
         i2c_del_driver(&lm85_driver);
 }
 
-/* Thanks to Richard Barrington for adding the LM85 to sensors-detect.
- * Thanks to Margit Schubert-While <margitsw@t-online.de> for help with
- *     post 2.7.0 CVS changes.
- */
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Philip Pokorny <ppokorny@penguincomputing.com>, "
         "Margit Schubert-While <margitsw@t-online.de>, "
-        "Justin Thiessen <jthiessen@penguincomputing.com");
+        "Justin Thiessen <jthiessen@penguincomputing.com>");
 MODULE_DESCRIPTION("LM85-B, LM85-C driver");
 
 module_init(sm_lm85_init);