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https://github.com/adulau/aha.git
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hwmon: (w83792d) Convert to a new-style i2c driver
The new-style w83792d driver implements the optional detect() callback to cover the use cases of the legacy driver. Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare
Jean Delvare
parent
cb0c1af379
commit
31d5d275a1
1 changed files with 72 additions and 142 deletions
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@ -267,9 +267,7 @@ DIV_TO_REG(long val)
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}
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struct w83792d_data {
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struct i2c_client client;
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struct device *hwmon_dev;
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enum chips type;
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struct mutex update_lock;
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char valid; /* !=0 if following fields are valid */
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@ -299,9 +297,11 @@ struct w83792d_data {
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u8 sf2_levels[3][4]; /* Smart FanII: Fan1,2,3 duty cycle levels */
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};
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static int w83792d_attach_adapter(struct i2c_adapter *adapter);
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static int w83792d_detect(struct i2c_adapter *adapter, int address, int kind);
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static int w83792d_detach_client(struct i2c_client *client);
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static int w83792d_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static int w83792d_detect(struct i2c_client *client, int kind,
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struct i2c_board_info *info);
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static int w83792d_remove(struct i2c_client *client);
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static struct w83792d_data *w83792d_update_device(struct device *dev);
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#ifdef DEBUG
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@ -310,12 +310,22 @@ static void w83792d_print_debug(struct w83792d_data *data, struct device *dev);
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static void w83792d_init_client(struct i2c_client *client);
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static const struct i2c_device_id w83792d_id[] = {
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{ "w83792d", w83792d },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, w83792d_id);
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static struct i2c_driver w83792d_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "w83792d",
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},
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.attach_adapter = w83792d_attach_adapter,
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.detach_client = w83792d_detach_client,
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.probe = w83792d_probe,
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.remove = w83792d_remove,
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.id_table = w83792d_id,
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.detect = w83792d_detect,
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.address_data = &addr_data,
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};
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static inline long in_count_from_reg(int nr, struct w83792d_data *data)
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@ -864,53 +874,14 @@ store_sf2_level(struct device *dev, struct device_attribute *attr,
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return count;
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}
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/* This function is called when:
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* w83792d_driver is inserted (when this module is loaded), for each
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available adapter
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* when a new adapter is inserted (and w83792d_driver is still present) */
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static int
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w83792d_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_probe(adapter, &addr_data, w83792d_detect);
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}
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static int
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w83792d_create_subclient(struct i2c_adapter *adapter,
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struct i2c_client *new_client, int addr,
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struct i2c_client **sub_cli)
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{
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int err;
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struct i2c_client *sub_client;
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(*sub_cli) = sub_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (!(sub_client)) {
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return -ENOMEM;
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}
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sub_client->addr = 0x48 + addr;
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i2c_set_clientdata(sub_client, NULL);
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sub_client->adapter = adapter;
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sub_client->driver = &w83792d_driver;
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sub_client->flags = 0;
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strlcpy(sub_client->name, "w83792d subclient", I2C_NAME_SIZE);
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if ((err = i2c_attach_client(sub_client))) {
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dev_err(&new_client->dev, "subclient registration "
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"at address 0x%x failed\n", sub_client->addr);
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kfree(sub_client);
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return err;
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}
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return 0;
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}
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static int
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w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
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struct i2c_client *new_client)
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w83792d_detect_subclients(struct i2c_client *new_client)
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{
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int i, id, err;
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int address = new_client->addr;
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u8 val;
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struct i2c_adapter *adapter = new_client->adapter;
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struct w83792d_data *data = i2c_get_clientdata(new_client);
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id = i2c_adapter_id(adapter);
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@ -932,10 +903,7 @@ w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
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val = w83792d_read_value(new_client, W83792D_REG_I2C_SUBADDR);
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if (!(val & 0x08)) {
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err = w83792d_create_subclient(adapter, new_client, val & 0x7,
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&data->lm75[0]);
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if (err < 0)
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goto ERROR_SC_0;
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data->lm75[0] = i2c_new_dummy(adapter, 0x48 + (val & 0x7));
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}
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if (!(val & 0x80)) {
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if ((data->lm75[0] != NULL) &&
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@ -945,10 +913,8 @@ w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
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err = -ENODEV;
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goto ERROR_SC_1;
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}
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err = w83792d_create_subclient(adapter, new_client,
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(val >> 4) & 0x7, &data->lm75[1]);
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if (err < 0)
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goto ERROR_SC_1;
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data->lm75[1] = i2c_new_dummy(adapter,
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0x48 + ((val >> 4) & 0x7));
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}
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return 0;
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@ -956,10 +922,8 @@ w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
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/* Undo inits in case of errors */
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ERROR_SC_1:
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if (data->lm75[0] != NULL) {
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i2c_detach_client(data->lm75[0]);
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kfree(data->lm75[0]);
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}
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if (data->lm75[0] != NULL)
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i2c_unregister_device(data->lm75[0]);
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ERROR_SC_0:
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return err;
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}
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@ -1294,47 +1258,25 @@ static const struct attribute_group w83792d_group = {
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.attrs = w83792d_attributes,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int
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w83792d_detect(struct i2c_adapter *adapter, int address, int kind)
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w83792d_detect(struct i2c_client *client, int kind, struct i2c_board_info *info)
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{
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int i = 0, val1 = 0, val2;
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struct i2c_client *client;
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struct device *dev;
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struct w83792d_data *data;
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int err = 0;
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const char *client_name = "";
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struct i2c_adapter *adapter = client->adapter;
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int val1, val2;
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unsigned short address = client->addr;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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goto ERROR0;
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return -ENODEV;
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}
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/* OK. For now, we presume we have a valid client. We now create the
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client structure, even though we cannot fill it completely yet.
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But it allows us to access w83792d_{read,write}_value. */
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if (!(data = kzalloc(sizeof(struct w83792d_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto ERROR0;
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}
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client = &data->client;
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dev = &client->dev;
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i2c_set_clientdata(client, data);
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client->addr = address;
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client->adapter = adapter;
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client->driver = &w83792d_driver;
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client->flags = 0;
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/* Now, we do the remaining detection. */
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/* The w83792d may be stuck in some other bank than bank 0. This may
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make reading other information impossible. Specify a force=... or
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force_*=... parameter, and the Winbond will be reset to the right
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bank. */
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if (kind < 0) {
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if (w83792d_read_value(client, W83792D_REG_CONFIG) & 0x80) {
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dev_dbg(dev, "Detection failed at step 1\n");
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goto ERROR1;
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return -ENODEV;
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}
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val1 = w83792d_read_value(client, W83792D_REG_BANK);
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val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
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@ -1342,16 +1284,14 @@ w83792d_detect(struct i2c_adapter *adapter, int address, int kind)
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if (!(val1 & 0x07)) { /* is Bank0 */
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if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
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((val1 & 0x80) && (val2 != 0x5c))) {
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dev_dbg(dev, "Detection failed at step 2\n");
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goto ERROR1;
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return -ENODEV;
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}
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}
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/* If Winbond chip, address of chip and W83792D_REG_I2C_ADDR
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should match */
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if (w83792d_read_value(client,
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W83792D_REG_I2C_ADDR) != address) {
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dev_dbg(dev, "Detection failed at step 3\n");
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goto ERROR1;
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return -ENODEV;
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}
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}
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@ -1367,45 +1307,48 @@ w83792d_detect(struct i2c_adapter *adapter, int address, int kind)
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/* get vendor ID */
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val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
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if (val2 != 0x5c) { /* the vendor is NOT Winbond */
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goto ERROR1;
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return -ENODEV;
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}
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val1 = w83792d_read_value(client, W83792D_REG_WCHIPID);
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if (val1 == 0x7a) {
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kind = w83792d;
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} else {
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if (kind == 0)
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dev_warn(dev,
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dev_warn(&adapter->dev,
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"w83792d: Ignoring 'force' parameter for"
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" unknown chip at adapter %d, address"
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" 0x%02x\n", i2c_adapter_id(adapter),
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address);
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goto ERROR1;
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return -ENODEV;
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}
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}
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if (kind == w83792d) {
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client_name = "w83792d";
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} else {
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dev_err(dev, "w83792d: Internal error: unknown kind (%d)?!?\n",
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kind);
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goto ERROR1;
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strlcpy(info->type, "w83792d", I2C_NAME_SIZE);
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return 0;
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}
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static int
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w83792d_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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struct w83792d_data *data;
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struct device *dev = &client->dev;
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int i, val1, err;
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data = kzalloc(sizeof(struct w83792d_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto ERROR0;
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}
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/* Fill in the remaining client fields and put into the global list */
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strlcpy(client->name, client_name, I2C_NAME_SIZE);
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data->type = kind;
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i2c_set_clientdata(client, data);
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data->valid = 0;
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mutex_init(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(client)))
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err = w83792d_detect_subclients(client);
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if (err)
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goto ERROR1;
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if ((err = w83792d_detect_subclients(adapter, address,
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kind, client)))
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goto ERROR2;
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/* Initialize the chip */
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w83792d_init_client(client);
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@ -1457,16 +1400,10 @@ exit_remove_files:
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for (i = 0; i < ARRAY_SIZE(w83792d_group_fan); i++)
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sysfs_remove_group(&dev->kobj, &w83792d_group_fan[i]);
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ERROR3:
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if (data->lm75[0] != NULL) {
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i2c_detach_client(data->lm75[0]);
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kfree(data->lm75[0]);
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}
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if (data->lm75[1] != NULL) {
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i2c_detach_client(data->lm75[1]);
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kfree(data->lm75[1]);
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}
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ERROR2:
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i2c_detach_client(client);
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if (data->lm75[0] != NULL)
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i2c_unregister_device(data->lm75[0]);
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if (data->lm75[1] != NULL)
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i2c_unregister_device(data->lm75[1]);
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ERROR1:
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kfree(data);
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ERROR0:
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@ -1474,30 +1411,23 @@ ERROR0:
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}
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static int
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w83792d_detach_client(struct i2c_client *client)
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w83792d_remove(struct i2c_client *client)
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{
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struct w83792d_data *data = i2c_get_clientdata(client);
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int err, i;
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int i;
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/* main client */
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if (data) {
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &w83792d_group);
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for (i = 0; i < ARRAY_SIZE(w83792d_group_fan); i++)
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sysfs_remove_group(&client->dev.kobj,
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&w83792d_group_fan[i]);
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}
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &w83792d_group);
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for (i = 0; i < ARRAY_SIZE(w83792d_group_fan); i++)
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sysfs_remove_group(&client->dev.kobj,
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&w83792d_group_fan[i]);
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if ((err = i2c_detach_client(client)))
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return err;
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/* main client */
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if (data)
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kfree(data);
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/* subclient */
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else
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kfree(client);
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if (data->lm75[0] != NULL)
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i2c_unregister_device(data->lm75[0]);
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if (data->lm75[1] != NULL)
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i2c_unregister_device(data->lm75[1]);
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kfree(data);
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return 0;
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}
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