Now it is possible to set desired sampling rate via v4l2 controls.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
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
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