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[media] msi3101: add stream format 336 I+Q pairs per frame 

That one seem to have 12-bit resolution. Use it for streams that
has sampling rate 6 <= rate (Msps) < 8, between 6 and 8Msps.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2013-08-07 11:27:21 -03:00 committed by Mauro Carvalho Chehab
parent 35111f5bc9
commit 8e2efac7d2
1 changed files with 95 additions and 0 deletions
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95
drivers/staging/media/msi3101/sdr-msi3101.c
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@ -604,6 +604,98 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u32 *dst,
return dst_len;
}
/*
* Converts signed 12-bit integer into 32-bit IEEE floating point
* representation.
*/
static u32 msi3101_convert_sample_336(struct msi3101_state *s, u16 x)
{
u32 msb, exponent, fraction, sign;
/* Zero is special */
if (!x)
return 0;
/* Negative / positive value */
if (x & (1 << 11)) {
x = -x;
x &= 0x7ff; /* result is 11 bit ... + sign */
sign = 1 << 31;
} else {
sign = 0 << 31;
}
/* Get location of the most significant bit */
msb = __fls(x);
/*
* Use a rotate instead of a shift because that works both leftwards
* and rightwards due to the mod(32) behaviour. This means we don't
* need to check to see if we are above 2^24 or not.
*/
fraction = ror32(x, (msb - I2F_FRAC_BITS) & 0x1f) & I2F_MASK;
exponent = (127 + msb) << I2F_FRAC_BITS;
return (fraction + exponent) | sign;
}
static int msi3101_convert_stream_336(struct msi3101_state *s, u32 *dst,
u8 *src, unsigned int src_len)
{
int i, j, i_max, dst_len = 0;
u16 sample[2];
u32 sample_num[3];
/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
for (i = 0; i < i_max; i++) {
sample_num[i] = src[3] << 24 | src[2] << 16 | src[1] << 8 | src[0] << 0;
if (i == 0 && s->next_sample != sample_num[0]) {
dev_dbg_ratelimited(&s->udev->dev,
"%d samples lost, %d %08x:%08x\n",
sample_num[0] - s->next_sample,
src_len, s->next_sample, sample_num[0]);
}
/*
* Dump all unknown 'garbage' data - maybe we will discover
* someday if there is something rational...
*/
dev_dbg_ratelimited(&s->udev->dev, "%*ph\n", 12, &src[4]);
src += 16;
for (j = 0; j < 1008; j += 3) {
sample[0] = (src[j + 0] & 0xff) >> 0 | (src[j + 1] & 0x0f) << 8;
sample[1] = (src[j + 1] & 0xf0) >> 4 | (src[j + 2] & 0xff) << 4;
*dst++ = msi3101_convert_sample_336(s, sample[0]);
*dst++ = msi3101_convert_sample_336(s, sample[1]);
}
/* 336 x I+Q 32bit float samples */
dst_len += 336 * 2 * 4;
src += 1008;
}
/* calculate samping rate and output it in 10 seconds intervals */
if ((s->jiffies + msecs_to_jiffies(10000)) <= jiffies) {
unsigned long jiffies_now = jiffies;
unsigned long msecs = jiffies_to_msecs(jiffies_now) - jiffies_to_msecs(s->jiffies);
unsigned int samples = sample_num[i_max - 1] - s->sample;
s->jiffies = jiffies_now;
s->sample = sample_num[i_max - 1];
dev_dbg(&s->udev->dev,
"slen=%d samples=%u msecs=%lu sampling rate=%lu\n",
src_len, samples, msecs,
samples * 1000UL / msecs);
}
/* next sample (sample = sample + i * 336) */
s->next_sample = sample_num[i_max - 1] + 336;
return dst_len;
}
/*
* Converts signed 14-bit integer into 32-bit IEEE floating point
* representation.
@ -1097,6 +1189,9 @@ static int msi3101_set_usb_adc(struct msi3101_state *s)
if (f_sr < 6000000) {
s->convert_stream = msi3101_convert_stream_252;
reg7 = 0x00009407;
} else if (f_sr < 8000000) {
s->convert_stream = msi3101_convert_stream_336;
reg7 = 0x00008507;
} else {
s->convert_stream = msi3101_convert_stream_384;
reg7 = 0x0000a507;