A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

i2c/pcf8574: No arbitrary initialization

Browse source 
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 <[email protected]>
Acked-by: Aurelien Jarno <[email protected]>
This commit is contained in:
Jean Delvare 2007-10-13 23:56:31 +02:00 • committed by Jean Delvare
commit 553515e5c5
2 changed files with 10 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

14
drivers/i2c/chips/pcf8574.c
View file

@ -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)