hwmon: (lm75) Drop legacy i2c driver

Drop the legacy lm75 driver, and add a detect callback to the
new-style driver to achieve the same functionality.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <david-b@pacbell.net>

1 files changed, 22 insertions, 92 deletions

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 7880c273c2c5..8f9595f2fb53 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -54,11 +54,11 @@ enum lm75_type {		/* keep sorted in alphabetical order */
         tmp75,
 };
 
-/* Addresses scanned by legacy style driver binding */
+/* Addresses scanned */
 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
                                         0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
 
-/* Insmod parameters (only for legacy style driver binding) */
+/* Insmod parameters */
 I2C_CLIENT_INSMOD_1(lm75);
 
 
@@ -72,7 +72,6 @@ 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 mutex            update_lock;
         u8                      orig_conf;
@@ -138,7 +137,7 @@ static const struct attribute_group lm75_group = {
 
 /*-----------------------------------------------------------------------*/
 
-/* "New style" I2C driver binding -- following the driver model */
+/* device probe and removal */
 
 static int
 lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
@@ -157,8 +156,6 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
                 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.
@@ -236,45 +233,16 @@ static const struct i2c_device_id lm75_ids[] = {
 };
 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)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm75_detect(struct i2c_client *new_client, int kind,
+                       struct i2c_board_info *info)
 {
+        struct i2c_adapter *adapter = new_client->adapter;
         int i;
-        struct i2c_client *new_client;
-        int err = 0;
 
         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 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->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &lm75_legacy_driver;
-        new_client->flags = 0;
+                return -ENODEV;
 
         /* Now, we do the remaining detection. There is no identification-
            dedicated register so we have to rely on several tricks:
@@ -294,71 +262,44 @@ 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;
+                        return -ENODEV;
                 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;
+                        return -ENODEV;
 
                 /* Unused bits */
                 if (conf & 0xe0)
-                        goto exit_free;
+                        return -ENODEV;
 
                 /* Addresses cycling */
                 for (i = 8; i < 0xff; i += 8)
                         if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
                          || i2c_smbus_read_word_data(new_client, i + 2) != hyst
                          || i2c_smbus_read_word_data(new_client, i + 3) != os)
-                                goto exit_free;
+                                return -ENODEV;
         }
 
         /* 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 */
-        err = i2c_attach_client(new_client);
-        if (err)
-                goto exit_free;
-
-        err = lm75_probe(new_client, NULL);
-        if (err < 0)
-                goto exit_detach;
+        strlcpy(info->type, "lm75", I2C_NAME_SIZE);
 
         return 0;
-
-exit_detach:
-        i2c_detach_client(new_client);
-exit_free:
-        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)
-{
-        lm75_remove(client);
-        i2c_detach_client(client);
-        kfree(client);
-        return 0;
-}
-
-static struct i2c_driver lm75_legacy_driver = {
+static struct i2c_driver lm75_driver = {
+        .class          = I2C_CLASS_HWMON,
         .driver = {
-                .name   = "lm75_legacy",
+                .name   = "lm75",
         },
-        .attach_adapter = lm75_attach_adapter,
-        .detach_client  = lm75_detach_client,
+        .probe          = lm75_probe,
+        .remove         = lm75_remove,
+        .id_table       = lm75_ids,
+        .detect         = lm75_detect,
+        .address_data   = &addr_data,
 };
 
 /*-----------------------------------------------------------------------*/
@@ -424,22 +365,11 @@ static struct lm75_data *lm75_update_device(struct device *dev)
 
 static int __init sensors_lm75_init(void)
 {
-        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;
+        return i2c_add_driver(&lm75_driver);
 }
 
 static void __exit sensors_lm75_exit(void)
 {
-        i2c_del_driver(&lm75_legacy_driver);
         i2c_del_driver(&lm75_driver);
 }