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[1/5] saa7164: add support for i2c read

Message ID 1427457439-1493-1-git-send-email-olli.salonen@iki.fi (mailing list archive)
State New, archived
Headers show

Commit Message

Olli Salonen March 27, 2015, 11:57 a.m. UTC 
Add support for pure I2C reads. Needed by si2157 tuner driver.

Signed-off-by: Olli Salonen <olli.salonen@iki.fi>
---
 drivers/media/pci/saa7164/saa7164-i2c.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
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Patch

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 */