summaryrefslogtreecommitdiff
path: root/drivers/i2c/chips/pca9539.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/chips/pca9539.c')
-rw-r--r--drivers/i2c/chips/pca9539.c110
1 files changed, 33 insertions, 77 deletions
diff --git a/drivers/i2c/chips/pca9539.c b/drivers/i2c/chips/pca9539.c
index f43c4e79b55e..270de4e56a81 100644
--- a/drivers/i2c/chips/pca9539.c
+++ b/drivers/i2c/chips/pca9539.c
@@ -14,8 +14,8 @@
#include <linux/i2c.h>
#include <linux/hwmon-sysfs.h>
-/* Addresses to scan */
-static unsigned short normal_i2c[] = {0x74, 0x75, 0x76, 0x77, I2C_CLIENT_END};
+/* Addresses to scan: none, device is not autodetected */
+static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(pca9539);
@@ -32,23 +32,6 @@ enum pca9539_cmd
PCA9539_DIRECTION_1 = 7,
};
-static int pca9539_attach_adapter(struct i2c_adapter *adapter);
-static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind);
-static int pca9539_detach_client(struct i2c_client *client);
-
-/* This is the driver that will be inserted */
-static struct i2c_driver pca9539_driver = {
- .driver = {
- .name = "pca9539",
- },
- .attach_adapter = pca9539_attach_adapter,
- .detach_client = pca9539_detach_client,
-};
-
-struct pca9539_data {
- struct i2c_client client;
-};
-
/* following are the sysfs callback functions */
static ssize_t pca9539_show(struct device *dev, struct device_attribute *attr,
char *buf)
@@ -105,78 +88,51 @@ static struct attribute_group pca9539_defattr_group = {
.attrs = pca9539_attributes,
};
-static int pca9539_attach_adapter(struct i2c_adapter *adapter)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int pca9539_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info)
{
- return i2c_probe(adapter, &addr_data, pca9539_detect);
-}
-
-/* This function is called by i2c_probe */
-static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *new_client;
- struct pca9539_data *data;
- int err = 0;
+ struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- 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. */
- if (!(data = kzalloc(sizeof(struct pca9539_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &pca9539_driver;
- new_client->flags = 0;
-
- if (kind < 0) {
- /* Detection: the pca9539 only has 8 registers (0-7).
- A read of 7 should succeed, but a read of 8 should fail. */
- if ((i2c_smbus_read_byte_data(new_client, 7) < 0) ||
- (i2c_smbus_read_byte_data(new_client, 8) >= 0))
- goto exit_kfree;
- }
-
- strlcpy(new_client->name, "pca9539", I2C_NAME_SIZE);
-
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_kfree;
+ return -ENODEV;
- /* Register sysfs hooks */
- err = sysfs_create_group(&new_client->dev.kobj,
- &pca9539_defattr_group);
- if (err)
- goto exit_detach;
+ strlcpy(info->type, "pca9539", I2C_NAME_SIZE);
return 0;
-
-exit_detach:
- i2c_detach_client(new_client);
-exit_kfree:
- kfree(data);
-exit:
- return err;
}
-static int pca9539_detach_client(struct i2c_client *client)
+static int pca9539_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
- int err;
+ /* Register sysfs hooks */
+ return sysfs_create_group(&client->dev.kobj,
+ &pca9539_defattr_group);
+}
+static int pca9539_remove(struct i2c_client *client)
+{
sysfs_remove_group(&client->dev.kobj, &pca9539_defattr_group);
-
- if ((err = i2c_detach_client(client)))
- return err;
-
- kfree(i2c_get_clientdata(client));
return 0;
}
+static const struct i2c_device_id pca9539_id[] = {
+ { "pca9539", 0 },
+ { }
+};
+
+static struct i2c_driver pca9539_driver = {
+ .driver = {
+ .name = "pca9539",
+ },
+ .probe = pca9539_probe,
+ .remove = pca9539_remove,
+ .id_table = pca9539_id,
+
+ .detect = pca9539_detect,
+ .address_data = &addr_data,
+};
+
static int __init pca9539_init(void)
{
return i2c_add_driver(&pca9539_driver);