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| author | Daniel Kurtz <djkurtz@chromium.org> | 2012-06-28 21:08:11 +0800 |
|---|---|---|
| committer | Henrik Rydberg <rydberg@euromail.se> | 2012-06-29 15:58:03 +0200 |
| commit | 771733e348e3df5b6283ab3b97d28577452bf09f (patch) | |
| tree | dcdcc637e61aa21a8a345bfb3b4797a1bc6e81c1 /drivers/input/touchscreen | |
| parent | 794eb67e76118108af5280ace2be8ae4983a6a81 (diff) | |
| download | linux-771733e348e3df5b6283ab3b97d28577452bf09f.tar.gz linux-771733e348e3df5b6283ab3b97d28577452bf09f.tar.bz2 linux-771733e348e3df5b6283ab3b97d28577452bf09f.zip | |
Input: atmel_mxt_ts - return errors from i2c layer
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>
Diffstat (limited to 'drivers/input/touchscreen')
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index ee37b0b0e0e4..a68b2279e8df 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -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, |