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