summaryrefslogtreecommitdiffstats
path: root/drivers/video/via/via_i2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/via/via_i2c.c')
-rw-r--r--drivers/video/via/via_i2c.c31
1 files changed, 26 insertions, 5 deletions
diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
index da9e4ca..3844b55 100644
--- a/drivers/video/via/via_i2c.c
+++ b/drivers/video/via/via_i2c.c
@@ -114,6 +114,7 @@ static void via_i2c_setsda(void *data, int state)
int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
{
+ int ret;
u8 mm1[] = {0x00};
struct i2c_msg msgs[2];
@@ -126,11 +127,18 @@ int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
mm1[0] = index;
msgs[0].len = 1; msgs[1].len = 1;
msgs[0].buf = mm1; msgs[1].buf = pdata;
- return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
}
int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
{
+ int ret;
u8 msg[2] = { index, data };
struct i2c_msg msgs;
@@ -140,11 +148,18 @@ int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
msgs.addr = slave_addr / 2;
msgs.len = 2;
msgs.buf = msg;
- return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
+ if (ret == 1)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
}
int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
{
+ int ret;
u8 mm1[] = {0x00};
struct i2c_msg msgs[2];
@@ -156,7 +171,13 @@ int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len
mm1[0] = index;
msgs[0].len = 1; msgs[1].len = buff_len;
msgs[0].buf = mm1; msgs[1].buf = buff;
- return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
}
/*
@@ -181,8 +202,8 @@ static int create_i2c_bus(struct i2c_adapter *adapter,
algo->setscl = via_i2c_setscl;
algo->getsda = via_i2c_getsda;
algo->getscl = via_i2c_getscl;
- algo->udelay = 40;
- algo->timeout = 20;
+ algo->udelay = 10;
+ algo->timeout = 2;
algo->data = adap_cfg;
sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
OpenPOWER on IntegriCloud