Add support for pure I2C reads. Needed by si2157 tuner driver.
Signed-off-by: Olli Salonen <olli.salonen@xxxxxx>
---
drivers/media/pci/saa7164/saa7164-i2c.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/media/pci/saa7164/saa7164-i2c.c b/drivers/media/pci/saa7164/saa7164-i2c.c
index 4f7e3b4..e30e206 100644
--- a/drivers/media/pci/saa7164/saa7164-i2c.c
+++ b/drivers/media/pci/saa7164/saa7164-i2c.c
@@ -39,9 +39,12 @@ static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
__func__, num, msgs[i].addr, msgs[i].len);
if (msgs[i].flags & I2C_M_RD) {
- /* Unsupported - Yet*/
- printk(KERN_ERR "%s() Unsupported - Yet\n", __func__);
- continue;
+ /* dummy write before read */
+ retval = saa7164_api_i2c_read(bus, msgs[i].addr,
+ 0, NULL, msgs[i].len, msgs[i].buf);
+
+ if (retval < 0)
+ goto err;
} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
msgs[i].addr == msgs[i + 1].addr) {
/* write then read from same address */
--
1.9.1
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