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-rw-r--r--Documentation/video4linux/bttv/Insmod-options6
-rw-r--r--drivers/media/video/bt8xx/bttv-i2c.c16
-rw-r--r--drivers/media/video/cx88/cx88-i2c.c10
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/video4linux/bttv/Insmod-options b/Documentation/video4linux/bttv/Insmod-options
index fc94ff235ffa..bb7c2cac7917 100644
--- a/Documentation/video4linux/bttv/Insmod-options
+++ b/Documentation/video4linux/bttv/Insmod-options
@@ -54,6 +54,12 @@ bttv.o
dropouts.
chroma_agc=0/1 AGC of chroma signal, off by default.
adc_crush=0/1 Luminance ADC crush, on by default.
+ i2c_udelay= Allow reduce I2C speed. Default is 5 usecs
+ (meaning 66,67 Kbps). The default is the
+ maximum supported speed by kernel bitbang
+ algoritm. You may use lower numbers, if I2C
+ messages are lost (16 is known to work on
+ all supported cards).
bttv_gpio=0/1
gpiomask=
diff --git a/drivers/media/video/bt8xx/bttv-i2c.c b/drivers/media/video/bt8xx/bttv-i2c.c
index 4b562b386fcf..03ee170181f2 100644
--- a/drivers/media/video/bt8xx/bttv-i2c.c
+++ b/drivers/media/video/bt8xx/bttv-i2c.c
@@ -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) */
@@ -426,6 +437,11 @@ 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,
diff --git a/drivers/media/video/cx88/cx88-i2c.c b/drivers/media/video/cx88/cx88-i2c.c
index 2aec4c18268a..a74ed632dda0 100644
--- a/drivers/media/video/cx88/cx88-i2c.c
+++ b/drivers/media/video/cx88/cx88-i2c.c
@@ -43,6 +43,11 @@ static unsigned int i2c_scan = 0;
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, 0644);
+MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
+ "(should be 5 or higher). Lower value means higher bus speed.");
+
#define dprintk(level,fmt, arg...) if (i2c_debug >= level) \
printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)
@@ -202,6 +207,11 @@ static void do_i2c_scan(char *name, struct i2c_client *c)
/* init + register i2c algo-bit adapter */
int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
{
+ /* Prevents usage of invalid delay values */
+ if (i2c_udelay<5)
+ i2c_udelay=5;
+ cx8800_i2c_algo_template.udelay=i2c_udelay;
+
memcpy(&core->i2c_adap, &cx8800_i2c_adap_template,
sizeof(core->i2c_adap));
memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,