提交 ccf37488 编写于 作者: J Jean Delvare 提交者: Jean Delvare

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: NJean Delvare <khali@linux-fr.org>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
上级 8fb597bb
......@@ -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 @@ static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind)
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);
}
......
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