diff options
| -rw-r--r-- | Documentation/video4linux/bttv/Insmod-options | 6 | ||||
| -rw-r--r-- | drivers/media/video/bt8xx/bttv-i2c.c | 16 | ||||
| -rw-r--r-- | drivers/media/video/cx88/cx88-i2c.c | 10 |
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/video4linux/bttv/Insmod-options b/Documentation/video4linux/bttv/Insmod-options index fc94ff235ff..bb7c2cac791 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 4b562b386fc..03ee170181f 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 2aec4c18268..a74ed632dda 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, |