diff options
| author | Andy Walls <awalls@radix.net> | 2009-11-21 01:47:45 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-05 18:41:55 -0200 |
| commit | f412d36a8c9f8e40e057b71e80d534ac388e903e (patch) | |
| tree | 36f5a0005efce82787a3dc99af8417dee79f0055 /drivers/media/video/ivtv/ivtv-driver.c | |
| parent | e45e8f5cee75b0559ce1ca7007b4963b91910fa8 (diff) | |
V4L/DVB (13442): ivtv: Add module parameter to adjust I2C SCL clock period per board
Add a module parameter to adjust I2C SCL clock period per board. This allows
some experimental fine tuning by end users to overcome quirky I2C device
problems.
Reported-by: "Aleksandr V. Piskunov" <aleksandr.v.piskunov@gmail.com>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-driver.c')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-driver.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/media/video/ivtv/ivtv-driver.c b/drivers/media/video/ivtv/ivtv-driver.c index 7cdbc1a8f21..8330fb5c7eb 100644 --- a/drivers/media/video/ivtv/ivtv-driver.c +++ b/drivers/media/video/ivtv/ivtv-driver.c @@ -91,10 +91,15 @@ static int radio[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; +static int i2c_clock_period[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1 }; static unsigned int cardtype_c = 1; static unsigned int tuner_c = 1; static unsigned int radio_c = 1; +static unsigned int i2c_clock_period_c = 1; static char pal[] = "---"; static char secam[] = "--"; static char ntsc[] = "-"; @@ -151,6 +156,7 @@ module_param(dec_vbi_buffers, int, 0644); module_param(tunertype, int, 0644); module_param(newi2c, int, 0644); +module_param_array(i2c_clock_period, int, &i2c_clock_period_c, 0644); MODULE_PARM_DESC(tuner, "Tuner type selection,\n" "\t\t\tsee tuner.h for values"); @@ -245,6 +251,10 @@ MODULE_PARM_DESC(newi2c, "Use new I2C implementation\n" "\t\t\t-1 is autodetect, 0 is off, 1 is on\n" "\t\t\tDefault is autodetect"); +MODULE_PARM_DESC(i2c_clock_period, + "Period of SCL for the I2C bus controlled by the CX23415/6\n" + "\t\t\tMin: 10 usec (100 kHz), Max: 4500 usec (222 Hz)\n" + "\t\t\tDefault: " __stringify(IVTV_DEFAULT_I2C_CLOCK_PERIOD)); MODULE_PARM_DESC(ivtv_first_minor, "Set device node number assigned to first card"); @@ -600,6 +610,15 @@ static void ivtv_process_options(struct ivtv *itv) itv->options.cardtype = cardtype[itv->instance]; itv->options.tuner = tuner[itv->instance]; itv->options.radio = radio[itv->instance]; + + itv->options.i2c_clock_period = i2c_clock_period[itv->instance]; + if (itv->options.i2c_clock_period == -1) + itv->options.i2c_clock_period = IVTV_DEFAULT_I2C_CLOCK_PERIOD; + else if (itv->options.i2c_clock_period < 10) + itv->options.i2c_clock_period = 10; + else if (itv->options.i2c_clock_period > 4500) + itv->options.i2c_clock_period = 4500; + itv->options.newi2c = newi2c; if (tunertype < -1 || tunertype > 1) { IVTV_WARN("Invalid tunertype argument, will autodetect instead\n"); |