Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[sfrench/cifs-2.6.git] / drivers / media / video / bt8xx / bttv-i2c.c
index 0dfbcc85ebb9d901ba36c53d509da2f794157673..70de6c96e201c9dba69a010d1b40d9d8294bc64a 100644 (file)
@@ -8,6 +8,9 @@
                           & Marcus Metzler (mocm@thp.uni-koeln.de)
     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
 
+    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
+       - Multituner support and i2c address binding
+
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
@@ -45,10 +48,18 @@ static int i2c_debug;
 static int i2c_hw;
 static int i2c_scan;
 module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_hw,"configure i2c debug level");
 module_param(i2c_hw,    int, 0444);
+MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, "
+                       "instead of software bitbang");
 module_param(i2c_scan,  int, 0444);
 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
 
+static unsigned int i2c_udelay = 5;
+module_param(i2c_udelay, int, 0444);
+MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs "
+               "(should be 5 or higher). Lower value means higher bus speed.");
+
 /* ----------------------------------------------------------------------- */
 /* I2C functions - bitbanging adapter (software i2c)                       */
 
@@ -425,6 +436,11 @@ int __devinit init_bttv_i2c(struct bttv *btv)
                       sizeof(bttv_i2c_adap_hw_template));
        } else {
                /* bt848 */
+       /* Prevents usage of invalid delay values */
+               if (i2c_udelay<5)
+                       i2c_udelay=5;
+               bttv_i2c_algo_bit_template.udelay=i2c_udelay;
+
                memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template,
                       sizeof(bttv_i2c_adap_sw_template));
                memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,