[PATCH] v4l: bug fix to correct tea5767 autodetection

This patch does correct radio chip autodetection to avoid misdetecting
mt20xx microtune as tea5767 chip.

Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/media/video/tea5767.c b/drivers/media/video/tea5767.c
index c8fd4204cd0a8ac3909ff7523211c0b451c4ff04..cebcc1fa68d12968e69dbd9297853fd9bb6f64bf 100644 (file)
--- a/drivers/media/video/tea5767.c
+++ b/drivers/media/video/tea5767.c
@@ -2,7 +2,7 @@
  * For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
  * I2C address is allways 0xC0.
  *
- * $Id: tea5767.c,v 1.26 2005/07/27 12:00:36 mkrufky Exp $
+ * $Id: tea5767.c,v 1.27 2005/07/31 12:10:56 mchehab Exp $
  *
  * Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@brturbo.com.br)
  * This code is placed under the terms of the GNU General Public License
@@ -296,7 +296,7 @@ int tea5767_autodetection(struct i2c_client *c)
        int rc;
        struct tuner *t = i2c_get_clientdata(c);
 
-       if (5 != (rc = i2c_master_recv(c, buffer, 5))) {
+       if (7 != (rc = i2c_master_recv(c, buffer, 7))) {
                tuner_warn("It is not a TEA5767. Received %i bytes.\n", rc);
                return EINVAL;
        }
@@ -323,6 +323,12 @@ int tea5767_autodetection(struct i2c_client *c)
                return EINVAL;
        }
 
+       /* It seems that tea5767 returns 0xff after the 5th byte */
+       if ((buffer[5] != 0xff) || (buffer[6] != 0xff)) {
+               tuner_warn("Returned more than 5 bytes. It is not a TEA5767\n");
+               return EINVAL;
+       }
+
        tuner_warn("TEA5767 detected.\n");
        return 0;
 }
@@ -331,7 +337,8 @@ int tea5767_tuner_init(struct i2c_client *c)
 {
        struct tuner *t = i2c_get_clientdata(c);
 
-       tuner_info("type set to %d (%s)\n", t->type, "Philips TEA5767HN FM Radio");
+       tuner_info("type set to %d (%s)\n", t->type,
+                       "Philips TEA5767HN FM Radio");
        strlcpy(c->name, "tea5767", sizeof(c->name));
 
        t->tv_freq = set_tv_freq;