Greg KH
2005-06-22T05:43:44Z

[PATCH] I2C: pcf8574 driver cleanup

I found a possible cleanup in the pcf8574 driver. We don't need to store
the read value in our private data structure, as we then never use it
again. I asked Aurelien and he is fine with the change. Please apply,
thanks.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
commit eb071cbbc38efa4b1d707f540de2ec6283ab0894
tree dd9037caf6acb546abe76f76d60987b8d870a1e4
parent 5d740fe9fefda41292b5cabe70f4f8eff9f8aad0
author Jean Delvare <khali@linux-fr.org> Sat, 04 Jun 2005 13:17:43 +0200
committer Greg Kroah-Hartman <gregkh@suse.de> Tue, 21 Jun 2005 21:52:03 -0700

drivers/i2c/chips/pcf8574.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/chips/pcf8574.c b/drivers/i2c/chips/pcf8574.c
--- a/drivers/i2c/chips/pcf8574.c
+++ b/drivers/i2c/chips/pcf8574.c
@@ -57,7 +57,7 @@ SENSORS_INSMOD_2(pcf8574, pcf8574a);
struct pcf8574_data {
struct i2c_client client;

- u8 read, write; /* Register values */
+ u8 write; /* Remember last written value */
};

static int pcf8574_attach_adapter(struct i2c_adapter *adapter);
@@ -79,9 +79,7 @@ static struct i2c_driver pcf8574_driver
static ssize_t show_read(struct device *dev, struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
- struct pcf8574_data *data = i2c_get_clientdata(client);
- data->read = i2c_smbus_read_byte(client);
- return sprintf(buf, "%u\n", data->read);
+ return sprintf(buf, "%u\n", i2c_smbus_read_byte(client));
}

static DEVICE_ATTR(read, S_IRUGO, show_read, NULL);