1 files changed, 203 insertions, 79 deletions

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index de698dc73020..7880c273c2c5 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -30,14 +30,37 @@
 #include "lm75.h"
 
 
-/* Addresses to scan */
+/*
+ * This driver handles the LM75 and compatible digital temperature sensors.
+ * Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be
+ * listed here.  We start at 9 since I2C_CLIENT_INSMOD_*() currently allow
+ * definition of up to 8 chip types (plus zero).
+ */
+
+enum lm75_type {                /* keep sorted in alphabetical order */
+        ds1775 = 9,
+        ds75,
+        /* lm75 -- in I2C_CLIENT_INSMOD_1() */
+        lm75a,
+        max6625,
+        max6626,
+        mcp980x,
+        stds75,
+        tcn75,
+        tmp100,
+        tmp101,
+        tmp175,
+        tmp275,
+        tmp75,
+};
+
+/* Addresses scanned by legacy style driver binding */
 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
                                         0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 
-/* Insmod parameters */
+/* Insmod parameters (only for legacy style driver binding) */
 I2C_CLIENT_INSMOD_1(lm75);
 
-/* Many LM75 constants specified below */
 
 /* The LM75 registers */
 #define LM75_REG_CONF           0x01
@@ -49,10 +72,11 @@ static const u8 LM75_REG_TEMP[3] = {
 
 /* Each client has this additional data */
 struct lm75_data {
-        struct i2c_client       client;
-        struct device *hwmon_dev;
+        struct i2c_client       *client;
+        struct device           *hwmon_dev;
         struct mutex            update_lock;
-        char                    valid;          /* !=0 if following fields are valid */
+        u8                      orig_conf;
+        char                    valid;          /* !=0 if registers are valid */
         unsigned long           last_updated;   /* In jiffies */
         u16                     temp[3];        /* Register values,
                                                    0 = input
@@ -60,23 +84,14 @@ struct lm75_data {
                                                    2 = hyst */
 };
 
-static int lm75_attach_adapter(struct i2c_adapter *adapter);
-static int lm75_detect(struct i2c_adapter *adapter, int address, int kind);
-static void lm75_init_client(struct i2c_client *client);
-static int lm75_detach_client(struct i2c_client *client);
 static int lm75_read_value(struct i2c_client *client, u8 reg);
 static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
 static struct lm75_data *lm75_update_device(struct device *dev);
 
 
-/* This is the driver that will be inserted */
-static struct i2c_driver lm75_driver = {
-        .driver = {
-                .name   = "lm75",
-        },
-        .attach_adapter = lm75_attach_adapter,
-        .detach_client  = lm75_detach_client,
-};
+/*-----------------------------------------------------------------------*/
+
+/* sysfs attributes for hwmon */
 
 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
                          char *buf)
@@ -109,13 +124,6 @@ static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
                         show_temp, set_temp, 2);
 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 
-static int lm75_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, lm75_detect);
-}
-
 static struct attribute *lm75_attributes[] = {
         &sensor_dev_attr_temp1_input.dev_attr.attr,
         &sensor_dev_attr_temp1_max.dev_attr.attr,
@@ -128,32 +136,144 @@ static const struct attribute_group lm75_group = {
         .attrs = lm75_attributes,
 };
 
+/*-----------------------------------------------------------------------*/
+
+/* "New style" I2C driver binding -- following the driver model */
+
+static int
+lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+        struct lm75_data *data;
+        int status;
+        u8 set_mask, clr_mask;
+        int new;
+
+        if (!i2c_check_functionality(client->adapter,
+                        I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+                return -EIO;
+
+        data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, data);
+
+        data->client = client;
+        mutex_init(&data->update_lock);
+
+        /* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
+         * Then tweak to be more precise when appropriate.
+         */
+        set_mask = 0;
+        clr_mask = (1 << 0)                     /* continuous conversions */
+                | (1 << 6) | (1 << 5);          /* 9-bit mode */
+
+        /* configure as specified */
+        status = lm75_read_value(client, LM75_REG_CONF);
+        if (status < 0) {
+                dev_dbg(&client->dev, "Can't read config? %d\n", status);
+                goto exit_free;
+        }
+        data->orig_conf = status;
+        new = status & ~clr_mask;
+        new |= set_mask;
+        if (status != new)
+                lm75_write_value(client, LM75_REG_CONF, new);
+        dev_dbg(&client->dev, "Config %02x\n", new);
+
+        /* Register sysfs hooks */
+        status = sysfs_create_group(&client->dev.kobj, &lm75_group);
+        if (status)
+                goto exit_free;
+
+        data->hwmon_dev = hwmon_device_register(&client->dev);
+        if (IS_ERR(data->hwmon_dev)) {
+                status = PTR_ERR(data->hwmon_dev);
+                goto exit_remove;
+        }
+
+        dev_info(&client->dev, "%s: sensor '%s'\n",
+                data->hwmon_dev->bus_id, client->name);
+
+        return 0;
+
+exit_remove:
+        sysfs_remove_group(&client->dev.kobj, &lm75_group);
+exit_free:
+        i2c_set_clientdata(client, NULL);
+        kfree(data);
+        return status;
+}
+
+static int lm75_remove(struct i2c_client *client)
+{
+        struct lm75_data *data = i2c_get_clientdata(client);
+
+        hwmon_device_unregister(data->hwmon_dev);
+        sysfs_remove_group(&client->dev.kobj, &lm75_group);
+        lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
+        i2c_set_clientdata(client, NULL);
+        kfree(data);
+        return 0;
+}
+
+static const struct i2c_device_id lm75_ids[] = {
+        { "ds1775", ds1775, },
+        { "ds75", ds75, },
+        { "lm75", lm75, },
+        { "lm75a", lm75a, },
+        { "max6625", max6625, },
+        { "max6626", max6626, },
+        { "mcp980x", mcp980x, },
+        { "stds75", stds75, },
+        { "tcn75", tcn75, },
+        { "tmp100", tmp100, },
+        { "tmp101", tmp101, },
+        { "tmp175", tmp175, },
+        { "tmp275", tmp275, },
+        { "tmp75", tmp75, },
+        { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, lm75_ids);
+
+static struct i2c_driver lm75_driver = {
+        .driver = {
+                .name   = "lm75",
+        },
+        .probe          = lm75_probe,
+        .remove         = lm75_remove,
+        .id_table       = lm75_ids,
+};
+
+/*-----------------------------------------------------------------------*/
+
+/* "Legacy" I2C driver binding */
+
+static struct i2c_driver lm75_legacy_driver;
+
 /* This function is called by i2c_probe */
 static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
 {
         int i;
         struct i2c_client *new_client;
-        struct lm75_data *data;
         int err = 0;
-        const char *name = "";
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
                                      I2C_FUNC_SMBUS_WORD_DATA))
                 goto exit;
 
-        /* OK. For now, we presume we have a valid client. We now create the
-           client structure, even though we cannot fill it completely yet.
-           But it allows us to access lm75_{read,write}_value. */
-        if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) {
+        /* OK. For now, we presume we have a valid address. We create the
+           client structure, even though there may be no sensor present.
+           But it allows us to use i2c_smbus_read_*_data() calls. */
+        new_client = kzalloc(sizeof *new_client, GFP_KERNEL);
+        if (!new_client) {
                 err = -ENOMEM;
                 goto exit;
         }
 
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
         new_client->addr = address;
         new_client->adapter = adapter;
-        new_client->driver = &lm75_driver;
+        new_client->driver = &lm75_legacy_driver;
         new_client->flags = 0;
 
         /* Now, we do the remaining detection. There is no identification-
@@ -174,17 +294,17 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
                  || i2c_smbus_read_word_data(new_client, 5) != hyst
                  || i2c_smbus_read_word_data(new_client, 6) != hyst
                  || i2c_smbus_read_word_data(new_client, 7) != hyst)
-                        goto exit_free;
+                        goto exit_free;
                 os = i2c_smbus_read_word_data(new_client, 3);
                 if (i2c_smbus_read_word_data(new_client, 4) != os
                  || i2c_smbus_read_word_data(new_client, 5) != os
                  || i2c_smbus_read_word_data(new_client, 6) != os
                  || i2c_smbus_read_word_data(new_client, 7) != os)
-                        goto exit_free;
+                        goto exit_free;
 
                 /* Unused bits */
                 if (conf & 0xe0)
-                        goto exit_free;
+                        goto exit_free;
 
                 /* Addresses cycling */
                 for (i = 8; i < 0xff; i += 8)
@@ -194,58 +314,57 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
                                 goto exit_free;
         }
 
-        /* Determine the chip type - only one kind supported! */
-        if (kind <= 0)
-                kind = lm75;
-
-        if (kind == lm75) {
-                name = "lm75";
-        }
-
-        /* Fill in the remaining client fields and put it into the global list */
-        strlcpy(new_client->name, name, I2C_NAME_SIZE);
-        data->valid = 0;
-        mutex_init(&data->update_lock);
+        /* NOTE: we treat "force=..." and "force_lm75=..." the same.
+         * Only new-style driver binding distinguishes chip types.
+         */
+        strlcpy(new_client->name, "lm75", I2C_NAME_SIZE);
 
         /* Tell the I2C layer a new client has arrived */
-        if ((err = i2c_attach_client(new_client)))
+        err = i2c_attach_client(new_client);
+        if (err)
                 goto exit_free;
 
-        /* Initialize the LM75 chip */
-        lm75_init_client(new_client);
-        
-        /* Register sysfs hooks */
-        if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group)))
+        err = lm75_probe(new_client, NULL);
+        if (err < 0)
                 goto exit_detach;
 
-        data->hwmon_dev = hwmon_device_register(&new_client->dev);
-        if (IS_ERR(data->hwmon_dev)) {
-                err = PTR_ERR(data->hwmon_dev);
-                goto exit_remove;
-        }
-
         return 0;
 
-exit_remove:
-        sysfs_remove_group(&new_client->dev.kobj, &lm75_group);
 exit_detach:
         i2c_detach_client(new_client);
 exit_free:
-        kfree(data);
+        kfree(new_client);
 exit:
         return err;
 }
 
+static int lm75_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_probe(adapter, &addr_data, lm75_detect);
+}
+
 static int lm75_detach_client(struct i2c_client *client)
 {
-        struct lm75_data *data = i2c_get_clientdata(client);
-        hwmon_device_unregister(data->hwmon_dev);
-        sysfs_remove_group(&client->dev.kobj, &lm75_group);
+        lm75_remove(client);
         i2c_detach_client(client);
-        kfree(data);
+        kfree(client);
         return 0;
 }
 
+static struct i2c_driver lm75_legacy_driver = {
+        .driver = {
+                .name   = "lm75_legacy",
+        },
+        .attach_adapter = lm75_attach_adapter,
+        .detach_client  = lm75_detach_client,
+};
+
+/*-----------------------------------------------------------------------*/
+
+/* register access */
+
 /* All registers are word-sized, except for the configuration register.
    LM75 uses a high-byte first convention, which is exactly opposite to
    the SMBus standard. */
@@ -268,16 +387,6 @@ static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
                 return i2c_smbus_write_word_data(client, reg, swab16(value));
 }
 
-static void lm75_init_client(struct i2c_client *client)
-{
-        int reg;
-
-        /* Enable if in shutdown mode */
-        reg = lm75_read_value(client, LM75_REG_CONF);
-        if (reg >= 0 && (reg & 0x01))
-                lm75_write_value(client, LM75_REG_CONF, reg & 0xfe);
-}
-
 static struct lm75_data *lm75_update_device(struct device *dev)
 {
         struct i2c_client *client = to_i2c_client(dev);
@@ -309,13 +418,28 @@ static struct lm75_data *lm75_update_device(struct device *dev)
         return data;
 }
 
+/*-----------------------------------------------------------------------*/
+
+/* module glue */
+
 static int __init sensors_lm75_init(void)
 {
-        return i2c_add_driver(&lm75_driver);
+        int status;
+
+        status = i2c_add_driver(&lm75_driver);
+        if (status < 0)
+                return status;
+
+        status = i2c_add_driver(&lm75_legacy_driver);
+        if (status < 0)
+                i2c_del_driver(&lm75_driver);
+
+        return status;
 }
 
 static void __exit sensors_lm75_exit(void)
 {
+        i2c_del_driver(&lm75_legacy_driver);
         i2c_del_driver(&lm75_driver);
 }