hwmon: (w83793) Convert to a new-style i2c driver
authorJean Delvare <khali@linux-fr.org>
Wed, 16 Jul 2008 17:30:17 +0000 (19:30 +0200)
committerJean Delvare <khali@mahadeva.delvare>
Wed, 16 Jul 2008 17:30:17 +0000 (19:30 +0200)
The new-style w83793 driver implements the optional detect()
callback to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
drivers/hwmon/w83793.c

index ed3c019b78c7284f805a83596abba56f77664028..0a739f1c69be568890d0168d739933b4acdf9655 100644 (file)
@@ -179,7 +179,6 @@ static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
 }
 
 struct w83793_data {
-       struct i2c_client client;
        struct i2c_client *lm75[2];
        struct device *hwmon_dev;
        struct mutex update_lock;
@@ -226,19 +225,31 @@ struct w83793_data {
 
 static u8 w83793_read_value(struct i2c_client *client, u16 reg);
 static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);
-static int w83793_attach_adapter(struct i2c_adapter *adapter);
-static int w83793_detect(struct i2c_adapter *adapter, int address, int kind);
-static int w83793_detach_client(struct i2c_client *client);
+static int w83793_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id);
+static int w83793_detect(struct i2c_client *client, int kind,
+                        struct i2c_board_info *info);
+static int w83793_remove(struct i2c_client *client);
 static void w83793_init_client(struct i2c_client *client);
 static void w83793_update_nonvolatile(struct device *dev);
 static struct w83793_data *w83793_update_device(struct device *dev);
 
+static const struct i2c_device_id w83793_id[] = {
+       { "w83793", w83793 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, w83793_id);
+
 static struct i2c_driver w83793_driver = {
+       .class          = I2C_CLASS_HWMON,
        .driver = {
                   .name = "w83793",
        },
-       .attach_adapter = w83793_attach_adapter,
-       .detach_client = w83793_detach_client,
+       .probe          = w83793_probe,
+       .remove         = w83793_remove,
+       .id_table       = w83793_id,
+       .detect         = w83793_detect,
+       .address_data   = &addr_data,
 };
 
 static ssize_t
@@ -1053,89 +1064,51 @@ static void w83793_init_client(struct i2c_client *client)
 
 }
 
-static int w83793_attach_adapter(struct i2c_adapter *adapter)
-{
-       if (!(adapter->class & I2C_CLASS_HWMON))
-               return 0;
-       return i2c_probe(adapter, &addr_data, w83793_detect);
-}
-
-static int w83793_detach_client(struct i2c_client *client)
+static int w83793_remove(struct i2c_client *client)
 {
        struct w83793_data *data = i2c_get_clientdata(client);
        struct device *dev = &client->dev;
-       int err, i;
+       int i;
 
-       /* main client */
-       if (data) {
-               hwmon_device_unregister(data->hwmon_dev);
+       hwmon_device_unregister(data->hwmon_dev);
 
-               for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
-                       device_remove_file(dev,
-                                          &w83793_sensor_attr_2[i].dev_attr);
+       for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
+               device_remove_file(dev,
+                                  &w83793_sensor_attr_2[i].dev_attr);
 
-               for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
-                       device_remove_file(dev, &sda_single_files[i].dev_attr);
+       for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
+               device_remove_file(dev, &sda_single_files[i].dev_attr);
 
-               for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
-                       device_remove_file(dev, &w83793_vid[i].dev_attr);
-               device_remove_file(dev, &dev_attr_vrm);
+       for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
+               device_remove_file(dev, &w83793_vid[i].dev_attr);
+       device_remove_file(dev, &dev_attr_vrm);
 
-               for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
-                       device_remove_file(dev, &w83793_left_fan[i].dev_attr);
+       for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
+               device_remove_file(dev, &w83793_left_fan[i].dev_attr);
 
-               for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
-                       device_remove_file(dev, &w83793_left_pwm[i].dev_attr);
+       for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
+               device_remove_file(dev, &w83793_left_pwm[i].dev_attr);
 
-               for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
-                       device_remove_file(dev, &w83793_temp[i].dev_attr);
-       }
+       for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
+               device_remove_file(dev, &w83793_temp[i].dev_attr);
 
-       if ((err = i2c_detach_client(client)))
-               return err;
+       if (data->lm75[0] != NULL)
+               i2c_unregister_device(data->lm75[0]);
+       if (data->lm75[1] != NULL)
+               i2c_unregister_device(data->lm75[1]);
 
-       /* main client */
-       if (data)
-               kfree(data);
-       /* subclient */
-       else
-               kfree(client);
+       kfree(data);
 
        return 0;
 }
 
 static int
-w83793_create_subclient(struct i2c_adapter *adapter,
-                       struct i2c_client *client, int addr,
-                       struct i2c_client **sub_cli)
-{
-       int err = 0;
-       struct i2c_client *sub_client;
-
-       (*sub_cli) = sub_client =
-           kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
-       if (!(sub_client)) {
-               return -ENOMEM;
-       }
-       sub_client->addr = 0x48 + addr;
-       i2c_set_clientdata(sub_client, NULL);
-       sub_client->adapter = adapter;
-       sub_client->driver = &w83793_driver;
-       strlcpy(sub_client->name, "w83793 subclient", I2C_NAME_SIZE);
-       if ((err = i2c_attach_client(sub_client))) {
-               dev_err(&client->dev, "subclient registration "
-                       "at address 0x%x failed\n", sub_client->addr);
-               kfree(sub_client);
-       }
-       return err;
-}
-
-static int
-w83793_detect_subclients(struct i2c_adapter *adapter, int address,
-                        int kind, struct i2c_client *client)
+w83793_detect_subclients(struct i2c_client *client)
 {
        int i, id, err;
+       int address = client->addr;
        u8 tmp;
+       struct i2c_adapter *adapter = client->adapter;
        struct w83793_data *data = i2c_get_clientdata(client);
 
        id = i2c_adapter_id(adapter);
@@ -1158,11 +1131,7 @@ w83793_detect_subclients(struct i2c_adapter *adapter, int address,
 
        tmp = w83793_read_value(client, W83793_REG_I2C_SUBADDR);
        if (!(tmp & 0x08)) {
-               err =
-                   w83793_create_subclient(adapter, client, tmp & 0x7,
-                                           &data->lm75[0]);
-               if (err < 0)
-                       goto ERROR_SC_0;
+               data->lm75[0] = i2c_new_dummy(adapter, 0x48 + (tmp & 0x7));
        }
        if (!(tmp & 0x80)) {
                if ((data->lm75[0] != NULL)
@@ -1173,10 +1142,8 @@ w83793_detect_subclients(struct i2c_adapter *adapter, int address,
                        err = -ENODEV;
                        goto ERROR_SC_1;
                }
-               err = w83793_create_subclient(adapter, client,
-                                             (tmp >> 4) & 0x7, &data->lm75[1]);
-               if (err < 0)
-                       goto ERROR_SC_1;
+               data->lm75[1] = i2c_new_dummy(adapter,
+                                             0x48 + ((tmp >> 4) & 0x7));
        }
 
        return 0;
@@ -1184,69 +1151,44 @@ w83793_detect_subclients(struct i2c_adapter *adapter, int address,
        /* Undo inits in case of errors */
 
 ERROR_SC_1:
-       if (data->lm75[0] != NULL) {
-               i2c_detach_client(data->lm75[0]);
-               kfree(data->lm75[0]);
-       }
+       if (data->lm75[0] != NULL)
+               i2c_unregister_device(data->lm75[0]);
 ERROR_SC_0:
        return err;
 }
 
-static int w83793_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int w83793_detect(struct i2c_client *client, int kind,
+                        struct i2c_board_info *info)
 {
-       int i;
-       u8 tmp, val;
-       struct i2c_client *client;
-       struct device *dev;
-       struct w83793_data *data;
-       int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
-       int files_pwm = ARRAY_SIZE(w83793_left_pwm) / 5;
-       int files_temp = ARRAY_SIZE(w83793_temp) / 6;
-       int err = 0;
+       u8 tmp, bank;
+       struct i2c_adapter *adapter = client->adapter;
+       unsigned short address = client->addr;
 
        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
-               goto exit;
+               return -ENODEV;
        }
 
-       /* 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 w83793_{read,write}_value. */
-
-       if (!(data = kzalloc(sizeof(struct w83793_data), GFP_KERNEL))) {
-               err = -ENOMEM;
-               goto exit;
-       }
-
-       client = &data->client;
-       dev = &client->dev;
-       i2c_set_clientdata(client, data);
-       client->addr = address;
-       client->adapter = adapter;
-       client->driver = &w83793_driver;
+       bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
 
-       data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
-
-       /* Now, we do the remaining detection. */
        if (kind < 0) {
-               tmp = data->bank & 0x80 ? 0x5c : 0xa3;
+               tmp = bank & 0x80 ? 0x5c : 0xa3;
                /* Check Winbond vendor ID */
                if (tmp != i2c_smbus_read_byte_data(client,
                                                        W83793_REG_VENDORID)) {
                        pr_debug("w83793: Detection failed at check "
                                 "vendor id\n");
-                       err = -ENODEV;
-                       goto free_mem;
+                       return -ENODEV;
                }
 
                /* If Winbond chip, address of chip and W83793_REG_I2C_ADDR
                   should match */
-               if ((data->bank & 0x07) == 0
+               if ((bank & 0x07) == 0
                 && i2c_smbus_read_byte_data(client, W83793_REG_I2C_ADDR) !=
                    (address << 1)) {
                        pr_debug("w83793: Detection failed at check "
                                 "i2c addr\n");
-                       err = -ENODEV;
-                       goto free_mem;
+                       return -ENODEV;
                }
 
        }
@@ -1255,30 +1197,47 @@ static int w83793_detect(struct i2c_adapter *adapter, int address, int kind)
           Winbond. Determine the chip type now */
 
        if (kind <= 0) {
-               if (0x7b == w83793_read_value(client, W83793_REG_CHIPID)) {
+               if (0x7b == i2c_smbus_read_byte_data(client,
+                                                    W83793_REG_CHIPID)) {
                        kind = w83793;
                } else {
                        if (kind == 0)
                                dev_warn(&adapter->dev, "w83793: Ignoring "
                                         "'force' parameter for unknown chip "
                                         "at address 0x%02x\n", address);
-                       err = -ENODEV;
-                       goto free_mem;
+                       return -ENODEV;
                }
        }
 
-       /* Fill in the remaining client fields and put into the global list */
-       strlcpy(client->name, "w83793", I2C_NAME_SIZE);
+       strlcpy(info->type, "w83793", I2C_NAME_SIZE);
+
+       return 0;
+}
 
+static int w83793_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       struct device *dev = &client->dev;
+       struct w83793_data *data;
+       int i, tmp, val, err;
+       int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
+       int files_pwm = ARRAY_SIZE(w83793_left_pwm) / 5;
+       int files_temp = ARRAY_SIZE(w83793_temp) / 6;
+
+       data = kzalloc(sizeof(struct w83793_data), GFP_KERNEL);
+       if (!data) {
+               err = -ENOMEM;
+               goto exit;
+       }
+
+       i2c_set_clientdata(client, data);
+       data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
        mutex_init(&data->update_lock);
 
-       /* Tell the I2C layer a new client has arrived */
-       if ((err = i2c_attach_client(client)))
+       err = w83793_detect_subclients(client);
+       if (err)
                goto free_mem;
 
-       if ((err = w83793_detect_subclients(adapter, address, kind, client)))
-               goto detach_client;
-
        /* Initialize the chip */
        w83793_init_client(client);
 
@@ -1459,16 +1418,10 @@ exit_remove:
        for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
                device_remove_file(dev, &w83793_temp[i].dev_attr);
 
-       if (data->lm75[0] != NULL) {
-               i2c_detach_client(data->lm75[0]);
-               kfree(data->lm75[0]);
-       }
-       if (data->lm75[1] != NULL) {
-               i2c_detach_client(data->lm75[1]);
-               kfree(data->lm75[1]);
-       }
-detach_client:
-       i2c_detach_client(client);
+       if (data->lm75[0] != NULL)
+               i2c_unregister_device(data->lm75[0]);
+       if (data->lm75[1] != NULL)
+               i2c_unregister_device(data->lm75[1]);
 free_mem:
        kfree(data);
 exit: