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| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2014-05-02 21:15:08 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-05-22 10:09:22 +0200 |
| commit | 5a72b25e7896e6358b62b590ce5b3a457516ae40 (patch) | |
| tree | 5ae28e2f484605b1bb6b9634755afd43527527c6 /drivers/i2c/busses/i2c-sh_mobile.c | |
| parent | i2c: sh_mobile: replace magic hex values with constants (diff) | |
| download | linux-5a72b25e7896e6358b62b590ce5b3a457516ae40.tar.xz linux-5a72b25e7896e6358b62b590ce5b3a457516ae40.zip | |
i2c: sh_mobile: improve error handling
Use standard i2c error codes for i2c failures. Also, don't print
something on timeout since it happens regularly with i2c. Simplify some,
logic, too.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-sh_mobile.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-sh_mobile.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index d91625eea6bb..d2fa222df3d1 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -480,7 +480,7 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, { if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) { dev_err(pd->dev, "Unsupported zero length i2c read\n"); - return -EIO; + return -EOPNOTSUPP; } if (do_init) { @@ -515,17 +515,12 @@ static int poll_dte(struct sh_mobile_i2c_data *pd) break; if (val & ICSR_TACK) - return -EIO; + return -ENXIO; udelay(10); } - if (!i) { - dev_warn(pd->dev, "Timeout polling for DTE!\n"); - return -ETIMEDOUT; - } - - return 0; + return i ? 0 : -ETIMEDOUT; } static int poll_busy(struct sh_mobile_i2c_data *pd) @@ -543,20 +538,18 @@ static int poll_busy(struct sh_mobile_i2c_data *pd) */ if (!(val & ICSR_BUSY)) { /* handle missing acknowledge and arbitration lost */ - if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) - return -EIO; + val |= pd->sr; + if (val & ICSR_TACK) + return -ENXIO; + if (val & ICSR_AL) + return -EAGAIN; break; } udelay(10); } - if (!i) { - dev_err(pd->dev, "Polling timed out\n"); - return -ETIMEDOUT; - } - - return 0; + return i ? 0 : -ETIMEDOUT; } static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, |