Now it is possible to set desired sampling rate via v4l2 controls. Signed-off-by: Antti Palosaari <crope@xxxxxx> --- drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c b/drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c index c4b72c1..0e12e1a 100644 --- a/drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c +++ b/drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c @@ -38,6 +38,8 @@ #include <media/v4l2-event.h> #include <media/videobuf2-vmalloc.h> +#include <linux/math64.h> + /* TODO: These should be moved to V4L2 API */ #define RTL2832_SDR_CID_SAMPLING_MODE ((V4L2_CID_USER_BASE | 0xf000) + 0) #define RTL2832_SDR_CID_SAMPLING_RATE ((V4L2_CID_USER_BASE | 0xf000) + 1) @@ -643,7 +645,7 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_state *s) struct dvb_frontend *fe = s->fe; int ret; unsigned int f_sr, f_if; - u8 buf[3], tmp; + u8 buf[4], tmp; u64 u64tmp; u32 u32tmp; @@ -696,8 +698,17 @@ static int rtl2832_sdr_set_adc(struct rtl2832_sdr_state *s) if (ret) goto err; - ret = rtl2832_sdr_wr_regs(s, 0x19f, "\x03\x84", 2); - ret = rtl2832_sdr_wr_regs(s, 0x1a1, "\x00\x00", 2); + /* program sampling rate (resampling down) */ + u32tmp = div_u64(s->cfg->xtal * 0x400000ULL, f_sr * 4U); + u32tmp <<= 2; + buf[0] = (u32tmp >> 24) & 0xff; + buf[1] = (u32tmp >> 16) & 0xff; + buf[2] = (u32tmp >> 8) & 0xff; + buf[3] = (u32tmp >> 0) & 0xff; + ret = rtl2832_sdr_wr_regs(s, 0x19f, buf, 4); + if (ret) + goto err; + ret = rtl2832_sdr_wr_regs(s, 0x11c, "\xca", 1); ret = rtl2832_sdr_wr_regs(s, 0x11d, "\xdc", 1); ret = rtl2832_sdr_wr_regs(s, 0x11e, "\xd7", 1); @@ -1090,8 +1101,8 @@ struct dvb_frontend *rtl2832_sdr_attach(struct dvb_frontend *fe, .id = RTL2832_SDR_CID_SAMPLING_RATE, .type = V4L2_CTRL_TYPE_INTEGER64, .name = "Sampling Rate", - .min = 500000, - .max = 4000000, + .min = 900001, + .max = 2800000, .def = 2048000, .step = 1, }; -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
