[linux-dvb] [PATCH] Make grundig_29504-401 tuner work on module re-insertion

[Jon Burgess <mplayer@jburgess.uklinux.net>]

I noticed that if I remove and re-insert the grundig tuner and 
dvb-ttpci-budget modules then the tuner module doesn't recognise the 
hardware.

I tracked this down to two of the initialisation sanity checks failing 
during the re-insertion. I have disabled these using the patch attached 
and it works for me. Does anyone have a good enough understanding of the 
chip to know if disabling these checks would cause a problem?

Are the relevant datasheets available?

Thanks,
	Jon

--- grundig_29504-401.c~	2003-06-07 12:53:55.000000000 +0100
+++ grundig_29504-401.c	2003-06-09 23:11:23.000000000 +0100
@@ -433,16 +433,20 @@
 	struct i2c_msg msg [] = { { .addr = 0x55, .flags = 0, .buf = b0, .len = 1 },
 			   { .addr = 0x55, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
 
+#if 0 // This test fails on re-insertion
 	if (i2c->xfer (i2c, msg, 2) == 2)   /*  probably an EEPROM... */
 		return -ENODEV;
+#endif
 
 	reset_and_configure (i2c);
 
 	if (i2c->xfer (i2c, msg, 2) != 2)   /*  nothing... */
 		return -ENODEV;
 
+#if 0 // This test fails on re-insertion
 	if (b1[0] != 0xa1)
 		return -ENODEV;
+#endif
 
 	dvb_register_frontend (grundig_29504_401_ioctl, i2c, NULL,
 			       &grundig_29504_401_info);