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authorJean Delvare <khali@linux-fr.org>2008-07-16 21:30:06 +0400
committerJean Delvare <khali@mahadeva.delvare>2008-07-16 21:30:06 +0400
commit8b77e6ac4911a79993e583ece719736a9e035b1d (patch)
tree91019e9effc2ceb173c08c00ed5698057beb4ccf /drivers/i2c
parent68be3363740e4ac3b4309faebcdf8fe5bf62ed2f (diff)
downloadlinux-8b77e6ac4911a79993e583ece719736a9e035b1d.tar.xz
i2c: Convert the pcf8591 driver to a new-style i2c driver
The new-style pcf8591 driver implements the optional detect() callback to cover the use cases of the legacy driver. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/chips/pcf8591.c94
1 files changed, 40 insertions, 54 deletions
diff --git a/drivers/i2c/chips/pcf8591.c b/drivers/i2c/chips/pcf8591.c
index db735379f22f..16ce3e193776 100644
--- a/drivers/i2c/chips/pcf8591.c
+++ b/drivers/i2c/chips/pcf8591.c
@@ -72,28 +72,15 @@ MODULE_PARM_DESC(input_mode,
#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
struct pcf8591_data {
- struct i2c_client client;
struct mutex update_lock;
u8 control;
u8 aout;
};
-static int pcf8591_attach_adapter(struct i2c_adapter *adapter);
-static int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind);
-static int pcf8591_detach_client(struct i2c_client *client);
static void pcf8591_init_client(struct i2c_client *client);
static int pcf8591_read_channel(struct device *dev, int channel);
-/* This is the driver that will be inserted */
-static struct i2c_driver pcf8591_driver = {
- .driver = {
- .name = "pcf8591",
- },
- .attach_adapter = pcf8591_attach_adapter,
- .detach_client = pcf8591_detach_client,
-};
-
/* following are the sysfs callback functions */
#define show_in_channel(channel) \
static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf) \
@@ -180,58 +167,46 @@ static const struct attribute_group pcf8591_attr_group_opt = {
/*
* Real code
*/
-static int pcf8591_attach_adapter(struct i2c_adapter *adapter)
-{
- return i2c_probe(adapter, &addr_data, pcf8591_detect);
-}
-/* This function is called by i2c_probe */
-static int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int pcf8591_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info)
{
- struct i2c_client *client;
- struct pcf8591_data *data;
- int err = 0;
+ struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
| I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
- goto exit;
+ return -ENODEV;
+
+ /* Now, we would do the remaining detection. But the PCF8591 is plainly
+ impossible to detect! Stupid chip. */
+
+ strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int pcf8591_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pcf8591_data *data;
+ int err;
- /* 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 pcf8591_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- client = &data->client;
i2c_set_clientdata(client, data);
- client->addr = address;
- client->adapter = adapter;
- client->driver = &pcf8591_driver;
-
- /* Now, we would do the remaining detection. But the PCF8591 is plainly
- impossible to detect! Stupid chip. */
-
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = pcf8591;
-
- /* Fill in the remaining client fields and put it into the global
- list */
- strlcpy(client->name, "pcf8591", I2C_NAME_SIZE);
mutex_init(&data->update_lock);
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(client)))
- goto exit_kfree;
-
/* Initialize the PCF8591 chip */
pcf8591_init_client(client);
/* Register sysfs hooks */
err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
if (err)
- goto exit_detach;
+ goto exit_kfree;
/* Register input2 if not in "two differential inputs" mode */
if (input_mode != 3) {
@@ -252,24 +227,16 @@ static int pcf8591_detect(struct i2c_adapter *adapter, int address, int kind)
exit_sysfs_remove:
sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
-exit_detach:
- i2c_detach_client(client);
exit_kfree:
kfree(data);
exit:
return err;
}
-static int pcf8591_detach_client(struct i2c_client *client)
+static int pcf8591_remove(struct i2c_client *client)
{
- int err;
-
sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
-
- if ((err = i2c_detach_client(client)))
- return err;
-
kfree(i2c_get_clientdata(client));
return 0;
}
@@ -316,6 +283,25 @@ static int pcf8591_read_channel(struct device *dev, int channel)
return (10 * value);
}
+static const struct i2c_device_id pcf8591_id[] = {
+ { "pcf8591", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcf8591_id);
+
+static struct i2c_driver pcf8591_driver = {
+ .driver = {
+ .name = "pcf8591",
+ },
+ .probe = pcf8591_probe,
+ .remove = pcf8591_remove,
+ .id_table = pcf8591_id,
+
+ .class = I2C_CLASS_HWMON, /* Nearest choice */
+ .detect = pcf8591_detect,
+ .address_data = &addr_data,
+};
+
static int __init pcf8591_init(void)
{
if (input_mode < 0 || input_mode > 3) {