hwmon: (thmc50) Convert to a new-style i2c driver

The new-style thmc50 driver implements the optional detect()
callback to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>

1 files changed, 53 insertions, 54 deletions

diff --git a/drivers/hwmon/thmc50.c b/drivers/hwmon/thmc50.c
index 76a3859c3fbe..3b01001108c1 100644
--- a/drivers/hwmon/thmc50.c
+++ b/drivers/hwmon/thmc50.c
@@ -60,7 +60,6 @@ static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
 
 /* Each client has this additional data */
 struct thmc50_data {
-        struct i2c_client client;
         struct device *hwmon_dev;
 
         struct mutex update_lock;
@@ -77,17 +76,31 @@ struct thmc50_data {
         u8 alarms;
 };
 
-static int thmc50_attach_adapter(struct i2c_adapter *adapter);
-static int thmc50_detach_client(struct i2c_client *client);
+static int thmc50_detect(struct i2c_client *client, int kind,
+                         struct i2c_board_info *info);
+static int thmc50_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id);
+static int thmc50_remove(struct i2c_client *client);
 static void thmc50_init_client(struct i2c_client *client);
 static struct thmc50_data *thmc50_update_device(struct device *dev);
 
+static const struct i2c_device_id thmc50_id[] = {
+        { "adm1022", adm1022 },
+        { "thmc50", thmc50 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, thmc50_id);
+
 static struct i2c_driver thmc50_driver = {
+        .class = I2C_CLASS_HWMON,
         .driver = {
                 .name = "thmc50",
         },
-        .attach_adapter = thmc50_attach_adapter,
-        .detach_client = thmc50_detach_client,
+        .probe = thmc50_probe,
+        .remove = thmc50_remove,
+        .id_table = thmc50_id,
+        .detect = thmc50_detect,
+        .address_data = &addr_data,
 };
 
 static ssize_t show_analog_out(struct device *dev,
@@ -250,39 +263,23 @@ static const struct attribute_group temp3_group = {
         .attrs = temp3_attributes,
 };
 
-static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int thmc50_detect(struct i2c_client *client, int kind,
+                         struct i2c_board_info *info)
 {
         unsigned company;
         unsigned revision;
         unsigned config;
-        struct i2c_client *client;
-        struct thmc50_data *data;
-        struct device *dev;
+        struct i2c_adapter *adapter = client->adapter;
         int err = 0;
         const char *type_name;
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
                 pr_debug("thmc50: detect failed, "
                          "smbus byte data not supported!\n");
-                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 thmc50 registers. */
-        if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) {
-                pr_debug("thmc50: detect failed, kzalloc failed!\n");
-                err = -ENOMEM;
-                goto exit;
+                return -ENODEV;
         }
 
-        client = &data->client;
-        i2c_set_clientdata(client, data);
-        client->addr = address;
-        client->adapter = adapter;
-        client->driver = &thmc50_driver;
-        dev = &client->dev;
-
         pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
                  client->addr, i2c_adapter_id(client->adapter));
 
@@ -307,21 +304,22 @@ static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
         }
         if (err == -ENODEV) {
                 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
-                goto exit_free;
+                return err;
         }
-        data->type = kind;
 
         if (kind == adm1022) {
                 int id = i2c_adapter_id(client->adapter);
                 int i;
 
                 type_name = "adm1022";
-                data->has_temp3 = (config >> 7) & 1;    /* config MSB */
                 for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
                         if (adm1022_temp3[i] == id &&
-                            adm1022_temp3[i + 1] == address) {
+                            adm1022_temp3[i + 1] == client->addr) {
                                 /* enable 2nd remote temp */
-                                data->has_temp3 = 1;
+                                config |= (1 << 7);
+                                i2c_smbus_write_byte_data(client,
+                                                          THMC50_REG_CONF,
+                                                          config);
                                 break;
                         }
         } else {
@@ -330,19 +328,33 @@ static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
         pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
                  type_name, (revision >> 4) - 0xc, revision & 0xf);
 
-        /* Fill in the remaining client fields & put it into the global list */
-        strlcpy(client->name, type_name, I2C_NAME_SIZE);
-        mutex_init(&data->update_lock);
+        strlcpy(info->type, type_name, I2C_NAME_SIZE);
 
-        /* Tell the I2C layer a new client has arrived */
-        if ((err = i2c_attach_client(client)))
-                goto exit_free;
+        return 0;
+}
+
+static int thmc50_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct thmc50_data *data;
+        int err;
+
+        data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL);
+        if (!data) {
+                pr_debug("thmc50: detect failed, kzalloc failed!\n");
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        i2c_set_clientdata(client, data);
+        data->type = id->driver_data;
+        mutex_init(&data->update_lock);
 
         thmc50_init_client(client);
 
         /* Register sysfs hooks */
         if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group)))
-                goto exit_detach;
+                goto exit_free;
 
         /* Register ADM1022 sysfs hooks */
         if (data->has_temp3)
@@ -364,34 +376,21 @@ exit_remove_sysfs:
                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 exit_remove_sysfs_thmc50:
         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
-exit_detach:
-        i2c_detach_client(client);
 exit_free:
         kfree(data);
 exit:
         return err;
 }
 
-static int thmc50_attach_adapter(struct i2c_adapter *adapter)
-{
-        if (!(adapter->class & I2C_CLASS_HWMON))
-                return 0;
-        return i2c_probe(adapter, &addr_data, thmc50_detect);
-}
-
-static int thmc50_detach_client(struct i2c_client *client)
+static int thmc50_remove(struct i2c_client *client)
 {
         struct thmc50_data *data = i2c_get_clientdata(client);
-        int err;
 
         hwmon_device_unregister(data->hwmon_dev);
         sysfs_remove_group(&client->dev.kobj, &thmc50_group);
         if (data->has_temp3)
                 sysfs_remove_group(&client->dev.kobj, &temp3_group);
 
-        if ((err = i2c_detach_client(client)))
-                return err;
-
         kfree(data);
 
         return 0;
@@ -412,8 +411,8 @@ static void thmc50_init_client(struct i2c_client *client)
         }
         config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
         config |= 0x1;  /* start the chip if it is in standby mode */
-        if (data->has_temp3)
-                config |= 0x80;         /* enable 2nd remote temp */
+        if (data->type == adm1022 && (config & (1 << 7)))
+                data->has_temp3 = 1;
         i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 }