From: Reinhard Pfau pfau@gdsys.de
if alen is 0: no longer start a write cycle before reading data.
Signed-off-by: Dirk Eibach eibach@gdsys.cc Signed-off-by: Reinhard Pfau pfau@gdsys.cc
Signed-off-by: Dirk Eibach dirk.eibach@gdsys.cc --- Changes in v2: - whitespace fixes
drivers/i2c/fsl_i2c.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 1c7265d..ab86bef 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -383,13 +383,16 @@ i2c_read(u8 dev, uint addr, int alen, u8 *data, int length) int i = -1; /* signal error */ u8 *a = (u8*)&addr;
- if (i2c_wait4bus() >= 0 + if (i2c_wait4bus() < 0) + return -1; + + if (alen > 0 && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0 && __i2c_write(&a[4 - alen], alen) == alen) i = 0; /* No error so far */
- if (length - && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0) + if (length && + i2c_write_addr(dev, I2C_READ_BIT, alen ? 1 : 0) != 0) i = __i2c_read(data, length);
writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);