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authorAmit Kucheria2009-12-11 13:21:45 +0100
committerSamuel Ortiz2009-12-13 19:22:00 +0100
commit147e084792f22b52df65a3d9d0e8b2a9233e0aa8 (patch)
treeb5598f79a70eaddce240fca1dfd2434544d1fb4e /drivers
parentab4abe056d8828341d2a7d6463b13eafaf210181 (diff)
mfd: Clarify twl4030 return value for read and write
We should be checking if all the messages were tranferred. If not, then we should propagate the i2c core error code or EIO. Currently we return success (0) even if none of messages were transferred successfully. Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mfd/twl4030-core.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
index e4a5d489b8e7..7c2ec0aa9d87 100644
--- a/drivers/mfd/twl4030-core.c
+++ b/drivers/mfd/twl4030-core.c
@@ -306,10 +306,17 @@ int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
mutex_unlock(&twl->xfer_lock);
- /* i2cTransfer returns num messages.translate it pls.. */
- if (ret >= 0)
- ret = 0;
- return ret;
+ /* i2c_transfer returns number of messages transferred */
+ if (ret != 1) {
+ pr_err("%s: i2c_write failed to transfer all messages\n",
+ DRIVER_NAME);
+ if (ret < 0)
+ return ret;
+ else
+ return -EIO;
+ } else {
+ return 0;
+ }
}
EXPORT_SYMBOL(twl4030_i2c_write);
@@ -358,10 +365,17 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
mutex_unlock(&twl->xfer_lock);
- /* i2cTransfer returns num messages.translate it pls.. */
- if (ret >= 0)
- ret = 0;
- return ret;
+ /* i2c_transfer returns number of messages transferred */
+ if (ret != 2) {
+ pr_err("%s: i2c_read failed to transfer all messages\n",
+ DRIVER_NAME);
+ if (ret < 0)
+ return ret;
+ else
+ return -EIO;
+ } else {
+ return 0;
+ }
}
EXPORT_SYMBOL(twl4030_i2c_read);