[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>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/media/video/tea5767.c b/drivers/media/video/tea5767.c
index c8fd4204cd0a..cebcc1fa68d1 100644
--- 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;