The new-style lm78 driver implements the optional detect() callback
to cover the use cases of the legacy driver.
Signed-off-by: Jean Delvare <khali at linux-fr.org>
---
drivers/hwmon/lm78.c | 200 +++++++++++++++++++++++---------------------------
1 file changed, 92 insertions(+), 108 deletions(-)
--- linux-2.6.27-rc6.orig/drivers/hwmon/lm78.c 2008-09-11 11:02:31.000000000 +0200
+++ linux-2.6.27-rc6/drivers/hwmon/lm78.c 2008-09-11 11:29:27.000000000 +0200
@@ -115,7 +115,7 @@ static inline int TEMP_FROM_REG(s8 val)
#define DIV_FROM_REG(val) (1 << (val))
struct lm78_data {
- struct i2c_client client;
+ struct i2c_client *client;
struct device *hwmon_dev;
struct mutex lock;
enum chips type;
@@ -142,9 +142,11 @@ struct lm78_data {
};
-static int lm78_attach_adapter(struct i2c_adapter *adapter);
-static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
-static int lm78_detach_client(struct i2c_client *client);
+static int lm78_i2c_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info);
+static int lm78_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id);
+static int lm78_i2c_remove(struct i2c_client *client);
static int __devinit lm78_isa_probe(struct platform_device *pdev);
static int __devexit lm78_isa_remove(struct platform_device *pdev);
@@ -155,12 +157,23 @@ static struct lm78_data *lm78_update_dev
static void lm78_init_device(struct lm78_data *data);
+static const struct i2c_device_id lm78_i2c_id[] = {
+ { "lm78", lm78 },
+ { "lm79", lm79 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
+
static struct i2c_driver lm78_driver = {
+ .class = I2C_CLASS_HWMON,
.driver = {
.name = "lm78",
},
- .attach_adapter = lm78_attach_adapter,
- .detach_client = lm78_detach_client,
+ .probe = lm78_i2c_probe,
+ .remove = lm78_i2c_remove,
+ .id_table = lm78_i2c_id,
+ .detect = lm78_i2c_detect,
+ .address_data = &addr_data,
};
static struct platform_driver lm78_isa_driver = {
@@ -445,29 +458,6 @@ static SENSOR_DEVICE_ATTR(fan2_alarm, S_
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
-/* This function is called when:
- * lm78_driver is inserted (when this module is loaded), for each
- available adapter
- * when a new adapter is inserted (and lm78_driver is still present)
- We block updates of the ISA device to minimize the risk of concurrent
- access to the same LM78 chip through different interfaces. */
-static int lm78_attach_adapter(struct i2c_adapter *adapter)
-{
- struct lm78_data *data;
- int err;
-
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
-
- data = pdev ? platform_get_drvdata(pdev) : NULL;
- if (data)
- mutex_lock(&data->update_lock);
- err = i2c_probe(adapter, &addr_data, lm78_detect);
- if (data)
- mutex_unlock(&data->update_lock);
- return err;
-}
-
static struct attribute *lm78_attributes[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_min.dev_attr.attr,
@@ -537,13 +527,11 @@ static DEVICE_ATTR(name, S_IRUGO, show_n
/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
{
- struct lm78_data *i2c, *isa;
+ struct lm78_data *isa;
int i;
if (!pdev) /* No ISA chip */
return 0;
-
- i2c = i2c_get_clientdata(client);
isa = platform_get_drvdata(pdev);
if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
@@ -554,70 +542,55 @@ static int lm78_alias_detect(struct i2c_
/* We compare all the limit registers, the config register and the
* interrupt mask registers */
for (i = 0x2b; i <= 0x3d; i++) {
- if (lm78_read_value(isa, i) != lm78_read_value(i2c, i))
+ if (lm78_read_value(isa, i) !=
+ i2c_smbus_read_byte_data(client, i))
return 0;
}
if (lm78_read_value(isa, LM78_REG_CONFIG) !=
- lm78_read_value(i2c, LM78_REG_CONFIG))
+ i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
return 0;
for (i = 0x43; i <= 0x46; i++) {
- if (lm78_read_value(isa, i) != lm78_read_value(i2c, i))
+ if (lm78_read_value(isa, i) !=
+ i2c_smbus_read_byte_data(client, i))
return 0;
}
return 1;
}
-/* This function is called by i2c_probe */
-static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
+static int lm78_i2c_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info)
{
- int i, err;
- struct i2c_client *new_client;
- struct lm78_data *data;
- const char *client_name = "";
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
- err = -ENODEV;
- goto ERROR1;
- }
-
- /* 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 lm78_{read,write}_value. */
-
- if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto ERROR1;
- }
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm78_driver;
+ int i;
+ struct lm78_data *isa = pdev ? platform_get_drvdata(pdev) : NULL;
+ const char *client_name;
+ struct i2c_adapter *adapter = client->adapter;
+ int address = client->addr;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ /* We block updates of the ISA device to minimize the risk of
+ concurrent access to the same LM78 chip through different
+ interfaces. */
+ if (isa)
+ mutex_lock(&isa->update_lock);
- /* Now, we do the remaining detection. */
if (kind < 0) {
- if (lm78_read_value(data, LM78_REG_CONFIG) & 0x80) {
- err = -ENODEV;
- goto ERROR2;
- }
- if (lm78_read_value(data, LM78_REG_I2C_ADDR) !=
- address) {
- err = -ENODEV;
- goto ERROR2;
- }
+ if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
+ || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR)
+ != address)
+ goto err_nodev;
+
/* Explicitly prevent the misdetection of Winbond chips */
- i = lm78_read_value(data, 0x4f);
- if (i == 0xa3 || i == 0x5c) {
- err = -ENODEV;
- goto ERROR2;
- }
+ i = i2c_smbus_read_byte_data(client, 0x4f);
+ if (i == 0xa3 || i == 0x5c)
+ goto err_nodev;
}
/* Determine the chip type. */
if (kind <= 0) {
- i = lm78_read_value(data, LM78_REG_CHIPID);
+ i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
if (i == 0x00 || i == 0x20 /* LM78 */
|| i == 0x40) /* LM78-J */
kind = lm78;
@@ -629,40 +602,59 @@ static int lm78_detect(struct i2c_adapte
"parameter for unknown chip at "
"adapter %d, address 0x%02x\n",
i2c_adapter_id(adapter), address);
- err = -ENODEV;
- goto ERROR2;
+ goto err_nodev;
}
- if (lm78_alias_detect(new_client, i)) {
+ if (lm78_alias_detect(client, i)) {
dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
"be the same as ISA device\n", address);
- err = -ENODEV;
- goto ERROR2;
+ goto err_nodev;
}
}
- if (kind == lm78) {
- client_name = "lm78";
- } else if (kind == lm79) {
+ if (isa)
+ mutex_unlock(&isa->update_lock);
+
+ switch (kind) {
+ case lm79:
client_name = "lm79";
+ break;
+ default:
+ client_name = "lm78";
}
+ strlcpy(info->type, client_name, I2C_NAME_SIZE);
+
+ return 0;
+
+ err_nodev:
+ if (isa)
+ mutex_unlock(&isa->update_lock);
+ return -ENODEV;
+}
- /* Fill in the remaining client fields and put into the global list */
- strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
- data->type = kind;
-
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto ERROR2;
+static int lm78_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lm78_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ data->client = client;
+ data->type = id->driver_data;
/* Initialize the LM78 chip */
lm78_init_device(data);
/* Register sysfs hooks */
- if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group)))
+ err = sysfs_create_group(&client->dev.kobj, &lm78_group);
+ if (err)
goto ERROR3;
- data->hwmon_dev = hwmon_device_register(&new_client->dev);
+ data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto ERROR4;
@@ -671,26 +663,18 @@ static int lm78_detect(struct i2c_adapte
return 0;
ERROR4:
- sysfs_remove_group(&new_client->dev.kobj, &lm78_group);
+ sysfs_remove_group(&client->dev.kobj, &lm78_group);
ERROR3:
- i2c_detach_client(new_client);
-ERROR2:
kfree(data);
-ERROR1:
return err;
}
-static int lm78_detach_client(struct i2c_client *client)
+static int lm78_i2c_remove(struct i2c_client *client)
{
struct lm78_data *data = i2c_get_clientdata(client);
- int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm78_group);
-
- if ((err = i2c_detach_client(client)))
- return err;
-
kfree(data);
return 0;
@@ -774,9 +758,9 @@ static int __devexit lm78_isa_remove(str
would slow down the LM78 access and should not be necessary. */
static int lm78_read_value(struct lm78_data *data, u8 reg)
{
- struct i2c_client *client = &data->client;
+ struct i2c_client *client = data->client;
- if (!client->driver) { /* ISA device */
+ if (!client) { /* ISA device */
int res;
mutex_lock(&data->lock);
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
@@ -796,9 +780,9 @@ static int lm78_read_value(struct lm78_d
nowhere else be necessary! */
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
{
- struct i2c_client *client = &data->client;
+ struct i2c_client *client = data->client;
- if (!client->driver) { /* ISA device */
+ if (!client) { /* ISA device */
mutex_lock(&data->lock);
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
--
Jean Delvare
