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hwmon: (w83791d) Convert to a new-style i2c driver 

The new-style w83791d 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: Marc Hulsman <m.hulsman@tudelft.nl>
This commit is contained in:
Jean Delvare 2008-07-16 19:30:17 +02:00 committed by Jean Delvare
parent ccf3748832
commit cb0c1af379
1 changed files with 72 additions and 135 deletions
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207
drivers/hwmon/w83791d.c
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@ -247,7 +247,6 @@ static u8 div_to_reg(int nr, long val)
}
struct w83791d_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
@ -286,9 +285,11 @@ struct w83791d_data {
u8 vrm; /* hwmon-vid */
};
static int w83791d_attach_adapter(struct i2c_adapter *adapter);
static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83791d_detach_client(struct i2c_client *client);
static int w83791d_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int w83791d_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static int w83791d_remove(struct i2c_client *client);
static int w83791d_read(struct i2c_client *client, u8 register);
static int w83791d_write(struct i2c_client *client, u8 register, u8 value);
@ -300,12 +301,22 @@ static void w83791d_print_debug(struct w83791d_data *data, struct device *dev);
static void w83791d_init_client(struct i2c_client *client);
static const struct i2c_device_id w83791d_id[] = {
{ "w83791d", w83791d },
{ }
};
MODULE_DEVICE_TABLE(i2c, w83791d_id);
static struct i2c_driver w83791d_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "w83791d",
},
.attach_adapter = w83791d_attach_adapter,
.detach_client = w83791d_detach_client,
.probe = w83791d_probe,
.remove = w83791d_remove,
.id_table = w83791d_id,
.detect = w83791d_detect,
.address_data = &addr_data,
};
/* following are the sysfs callback functions */
@ -905,49 +916,12 @@ static const struct attribute_group w83791d_group = {
.attrs = w83791d_attributes,
};
/* This function is called when:
* w83791d_driver is inserted (when this module is loaded), for each
available adapter
* when a new adapter is inserted (and w83791d_driver is still present) */
static int w83791d_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, w83791d_detect);
}
static int w83791d_create_subclient(struct i2c_adapter *adapter,
struct i2c_client *client, int addr,
struct i2c_client **sub_cli)
{
int err;
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 = &w83791d_driver;
strlcpy(sub_client->name, "w83791d 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;
}
return 0;
}
static int w83791d_detect_subclients(struct i2c_adapter *adapter, int address,
int kind, struct i2c_client *client)
static int w83791d_detect_subclients(struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
struct w83791d_data *data = i2c_get_clientdata(client);
int address = client->addr;
int i, id, err;
u8 val;
@ -971,10 +945,7 @@ static int w83791d_detect_subclients(struct i2c_adapter *adapter, int address,
val = w83791d_read(client, W83791D_REG_I2C_SUBADDR);
if (!(val & 0x08)) {
err = w83791d_create_subclient(adapter, client,
val & 0x7, &data->lm75[0]);
if (err < 0)
goto error_sc_0;
data->lm75[0] = i2c_new_dummy(adapter, 0x48 + (val & 0x7));
}
if (!(val & 0x80)) {
if ((data->lm75[0] != NULL) &&
@ -986,10 +957,8 @@ static int w83791d_detect_subclients(struct i2c_adapter *adapter, int address,
err = -ENODEV;
goto error_sc_1;
}
err = w83791d_create_subclient(adapter, client,
(val >> 4) & 0x7, &data->lm75[1]);
if (err < 0)
goto error_sc_1;
data->lm75[1] = i2c_new_dummy(adapter,
0x48 + ((val >> 4) & 0x7));
}
return 0;
@ -997,53 +966,31 @@ static int w83791d_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 w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
/* Return 0 if detection is successful, -ENODEV otherwise */
static int w83791d_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
struct i2c_client *client;
struct device *dev;
struct w83791d_data *data;
int i, val1, val2;
int err = 0;
const char *client_name = "";
struct i2c_adapter *adapter = client->adapter;
int val1, val2;
unsigned short address = client->addr;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
goto error0;
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 w83791d_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct w83791d_data), GFP_KERNEL))) {
err = -ENOMEM;
goto error0;
}
client = &data->client;
dev = &client->dev;
i2c_set_clientdata(client, data);
client->addr = address;
client->adapter = adapter;
client->driver = &w83791d_driver;
mutex_init(&data->update_lock);
/* Now, we do the remaining detection. */
/* The w83791d may be stuck in some other bank than bank 0. This may
make reading other information impossible. Specify a force=...
parameter, and the Winbond will be reset to the right bank. */
if (kind < 0) {
if (w83791d_read(client, W83791D_REG_CONFIG) & 0x80) {
dev_dbg(dev, "Detection failed at step 1\n");
goto error1;
return -ENODEV;
}
val1 = w83791d_read(client, W83791D_REG_BANK);
val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
@ -1052,15 +999,13 @@ static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
/* yes it is Bank0 */
if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
((val1 & 0x80) && (val2 != 0x5c))) {
dev_dbg(dev, "Detection failed at step 2\n");
goto error1;
return -ENODEV;
}
}
/* If Winbond chip, address of chip and W83791D_REG_I2C_ADDR
should match */
if (w83791d_read(client, W83791D_REG_I2C_ADDR) != address) {
dev_dbg(dev, "Detection failed at step 3\n");
goto error1;
return -ENODEV;
}
}
@ -1075,30 +1020,33 @@ static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
/* get vendor ID */
val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
if (val2 != 0x5c) { /* the vendor is NOT Winbond */
dev_dbg(dev, "Detection failed at step 4\n");
goto error1;
return -ENODEV;
}
val1 = w83791d_read(client, W83791D_REG_WCHIPID);
if (val1 == 0x71) {
kind = w83791d;
} else {
if (kind == 0)
dev_warn(dev,
dev_warn(&adapter->dev,
"w83791d: Ignoring 'force' parameter "
"for unknown chip at adapter %d, "
"address 0x%02x\n",
i2c_adapter_id(adapter), address);
goto error1;
return -ENODEV;
}
}
if (kind == w83791d) {
client_name = "w83791d";
} else {
dev_err(dev, "w83791d: Internal error: unknown kind (%d)?!?\n",
kind);
goto error1;
}
strlcpy(info->type, "w83791d", I2C_NAME_SIZE);
return 0;
}
static int w83791d_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct w83791d_data *data;
struct device *dev = &client->dev;
int i, val1, err;
#ifdef DEBUG
val1 = w83791d_read(client, W83791D_REG_DID_VID4);
@ -1106,16 +1054,19 @@ static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
(val1 >> 5) & 0x07, (val1 >> 1) & 0x0f, val1);
#endif
/* Fill in the remaining client fields and put into the global list */
strlcpy(client->name, client_name, I2C_NAME_SIZE);
data = kzalloc(sizeof(struct w83791d_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto error0;
}
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(client)))
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
err = w83791d_detect_subclients(client);
if (err)
goto error1;
if ((err = w83791d_detect_subclients(adapter, address, kind, client)))
goto error2;
/* Initialize the chip */
w83791d_init_client(client);
@ -1141,43 +1092,29 @@ static int w83791d_detect(struct i2c_adapter *adapter, int address, int kind)
error4:
sysfs_remove_group(&client->dev.kobj, &w83791d_group);
error3:
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]);
}
error2:
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]);
error1:
kfree(data);
error0:
return err;
}
static int w83791d_detach_client(struct i2c_client *client)
static int w83791d_remove(struct i2c_client *client)
{
struct w83791d_data *data = i2c_get_clientdata(client);
int err;
/* main client */
if (data) {
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &w83791d_group);
}
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &w83791d_group);
if ((err = i2c_detach_client(client)))
return err;
/* main client */
if (data)
kfree(data);
/* subclient */
else
kfree(client);
if (data->lm75[0] != NULL)
i2c_unregister_device(data->lm75[0]);
if (data->lm75[1] != NULL)
i2c_unregister_device(data->lm75[1]);
kfree(data);
return 0;
}