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Input: atmel_mxt_ts - return errors from i2c layer

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The i2c layer can report a variety of errors, including -ENXIO for an i2c
NAK.  Instead of treating them all as -EIO, pass the actual i2c layer
error up to the caller.

However, still report as -EIO the unlikely case that a transaction was
partially completed, and no error message was returned from i2c_*().

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
This commit is contained in:
Daniel Kurtz 2012-06-28 21:08:11 +08:00 committed by Henrik Rydberg
parent 794eb67e76
commit 771733e348
1 changed files with 20 additions and 8 deletions
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28
drivers/input/touchscreen/atmel_mxt_ts.c
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@ -396,6 +396,7 @@ static int __mxt_read_reg(struct i2c_client *client,
{
struct i2c_msg xfer[2];
u8 buf[2];
int ret;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
@ -412,12 +413,17 @@ static int __mxt_read_reg(struct i2c_client *client,
xfer[1].len = len;
xfer[1].buf = val;
if (i2c_transfer(client->adapter, xfer, 2) != 2) {
dev_err(&client->dev, "%s: i2c transfer failed\n", __func__);
return -EIO;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret == 2) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
__func__, ret);
}
return 0;
return ret;
}
static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
@ -428,17 +434,23 @@ static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
u8 buf[3];
int ret;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
buf[2] = val;
if (i2c_master_send(client, buf, 3) != 3) {
dev_err(&client->dev, "%s: i2c send failed\n", __func__);
return -EIO;
ret = i2c_master_send(client, buf, 3);
if (ret == 3) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
return 0;
return ret;
}
static int mxt_read_object_table(struct i2c_client *client,