i2c/pcf8574: No arbitrary initialization

Do not initialize the PCF8574 with an arbitrary value. Users will have
to write the initial value to sysfs themselves.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Aurelien Jarno <aurelien@aurel32.net>

diff --git a/Documentation/i2c/chips/pcf8574 b/Documentation/i2c/chips/pcf8574
index 2752c8ce3167c523eaf14bc82d975268cd502515..5c1ad1376b62e5588d1b95b0f573211b39e70851 100644 (file)
--- a/Documentation/i2c/chips/pcf8574
+++ b/Documentation/i2c/chips/pcf8574
@@ -62,8 +62,6 @@ if the corresponding output is set as 1, otherwise the current output
 value, that is to say 0.
 
 The write file is read/write. Writing a value outputs it on the I/O
-port. Reading returns the last written value.
-
-On module initialization the chip is configured as eight inputs (all
-outputs to 1), so you can connect any circuit to the PCF8574(A) without
-being afraid of short-circuit.
+port. Reading returns the last written value. As it is not possible
+to read this value from the chip, you need to write at least once to
+this file before you can read back from it.

diff --git a/drivers/i2c/chips/pcf8574.c b/drivers/i2c/chips/pcf8574.c
index 32b25427eaba6e54ecc0a6674ab60a0a18f2c297..21c6dd69193c21804ab55ced727ff412df9f48ce 100644 (file)
--- a/drivers/i2c/chips/pcf8574.c
+++ b/drivers/i2c/chips/pcf8574.c
@@ -48,14 +48,11 @@ static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
 /* Insmod parameters */
 I2C_CLIENT_INSMOD_2(pcf8574, pcf8574a);
 
-/* Initial values */
-#define PCF8574_INIT 255       /* All outputs on (input mode) */
-
 /* Each client has this additional data */
 struct pcf8574_data {
        struct i2c_client client;
 
-       u8 write;                       /* Remember last written value */
+       int write;                      /* Remember last written value */
 };
 
 static int pcf8574_attach_adapter(struct i2c_adapter *adapter);
@@ -85,7 +82,11 @@ static DEVICE_ATTR(read, S_IRUGO, show_read, NULL);
 static ssize_t show_write(struct device *dev, struct device_attribute *attr, char *buf)
 {
        struct pcf8574_data *data = i2c_get_clientdata(to_i2c_client(dev));
-       return sprintf(buf, "%u\n", data->write);
+
+       if (data->write < 0)
+               return data->write;
+
+       return sprintf(buf, "%d\n", data->write);
 }
 
 static ssize_t set_write(struct device *dev, struct device_attribute *attr, const char *buf,
@@ -206,8 +207,7 @@ static int pcf8574_detach_client(struct i2c_client *client)
 static void pcf8574_init_client(struct i2c_client *client)
 {
        struct pcf8574_data *data = i2c_get_clientdata(client);
-       data->write = PCF8574_INIT;
-       i2c_smbus_write_byte(client, data->write);
+       data->write = -EAGAIN;
 }
 
 static int __init pcf8574_init(void)