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| author | Danielle Costantino <danielle.costantino@gmail.com> | 2014-11-12 05:08:09 -0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-11-12 16:34:11 +0100 |
| commit | ab0831d0f35b44724390134d03bcff99ae0d8a7e (patch) | |
| tree | 5cf920115157bc2ab112e8c9f8cb42736b4bfd3c /drivers/i2c | |
| parent | 550d0407a8c0be348e9f6f5c24de8478101d995b (diff) | |
| download | linux-ab0831d0f35b44724390134d03bcff99ae0d8a7e.tar.gz linux-ab0831d0f35b44724390134d03bcff99ae0d8a7e.tar.bz2 linux-ab0831d0f35b44724390134d03bcff99ae0d8a7e.zip | |
i2c: mpc: report correct I2C error return codes
This patch enforces correct I2C error returned codes from Freescale's
MPC i2c bus driver, allowing for proper user-space/kernel error
handling.
Signed-off-by: Danielle Costantino <danielle.costantino@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mpc.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index 0edf630b099a..4c5d7d92b9fe 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -124,7 +124,7 @@ static void mpc_i2c_fixup(struct mpc_i2c *i2c) static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing) { unsigned long orig_jiffies = jiffies; - u32 x; + u32 cmd_err; int result = 0; if (!i2c->irq) { @@ -133,11 +133,11 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing) if (time_after(jiffies, orig_jiffies + timeout)) { dev_dbg(i2c->dev, "timeout\n"); writeccr(i2c, 0); - result = -EIO; + result = -ETIMEDOUT; break; } } - x = readb(i2c->base + MPC_I2C_SR); + cmd_err = readb(i2c->base + MPC_I2C_SR); writeb(0, i2c->base + MPC_I2C_SR); } else { /* Interrupt mode */ @@ -150,28 +150,28 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing) result = -ETIMEDOUT; } - x = i2c->interrupt; + cmd_err = i2c->interrupt; i2c->interrupt = 0; } if (result < 0) return result; - if (!(x & CSR_MCF)) { + if (!(cmd_err & CSR_MCF)) { dev_dbg(i2c->dev, "unfinished\n"); return -EIO; } - if (x & CSR_MAL) { + if (cmd_err & CSR_MAL) { dev_dbg(i2c->dev, "MAL\n"); - return -EIO; + return -EAGAIN; } - if (writing && (x & CSR_RXAK)) { + if (writing && (cmd_err & CSR_RXAK)) { dev_dbg(i2c->dev, "No RXAK\n"); /* generate stop */ writeccr(i2c, CCR_MEN); - return -EIO; + return -ENXIO; } return 0; } |