From 147e084792f22b52df65a3d9d0e8b2a9233e0aa8 Mon Sep 17 00:00:00 2001 From: Amit Kucheria Date: Fri, 11 Dec 2009 13:21:45 +0100 Subject: [PATCH] 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 Signed-off-by: Samuel Ortiz --- drivers/mfd/twl4030-core.c | 30 ++++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-) diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c index e4a5d48..7c2ec0a 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); -- 2.7.4