unsigned int vb_full; /* vb is full and packets dropped */
struct urb *urbs[MAX_ISO_BUFS];
+ int (*convert_stream) (struct msi3101_state *s, u32 *dst, u8 *src,
+ unsigned int src_len);
/* Controls */
struct v4l2_ctrl_handler ctrl_handler;
*/
#define I2F_FRAC_BITS 23
#define I2F_MASK ((1 << I2F_FRAC_BITS) - 1)
-static u32 msi3101_convert_sample(struct msi3101_state *s, u16 x, int shift)
+static u32 msi3101_convert_sample_384(struct msi3101_state *s, u16 x, int shift)
{
u32 msb, exponent, fraction, sign;
s->sample_ctrl_bit[shift]++;
#define MSI3101_CONVERT_IN_URB_HANDLER
#define MSI3101_EXTENSIVE_DEBUG
-static int msi3101_convert_stream(struct msi3101_state *s, u32 *dst,
+static int msi3101_convert_stream_384(struct msi3101_state *s, u32 *dst,
u8 *src, unsigned int src_len)
{
int i, j, k, l, i_max, dst_len = 0;
sample[2] = (src[l + 2] & 0xf0) >> 4 | (src[l + 3] & 0x3f) << 4;
sample[3] = (src[l + 3] & 0xc0) >> 6 | (src[l + 4] & 0xff) << 2;
- *dst++ = msi3101_convert_sample(s, sample[0], (bits >> (2 * k)) & 0x3);
- *dst++ = msi3101_convert_sample(s, sample[1], (bits >> (2 * k)) & 0x3);
- *dst++ = msi3101_convert_sample(s, sample[2], (bits >> (2 * k)) & 0x3);
- *dst++ = msi3101_convert_sample(s, sample[3], (bits >> (2 * k)) & 0x3);
+ *dst++ = msi3101_convert_sample_384(s, sample[0], (bits >> (2 * k)) & 0x3);
+ *dst++ = msi3101_convert_sample_384(s, sample[1], (bits >> (2 * k)) & 0x3);
+ *dst++ = msi3101_convert_sample_384(s, sample[2], (bits >> (2 * k)) & 0x3);
+ *dst++ = msi3101_convert_sample_384(s, sample[3], (bits >> (2 * k)) & 0x3);
/* 4 x 32bit float samples */
dst_len += 4 * 4;
return dst_len;
}
+/*
+ * Converts signed 14-bit integer into 32-bit IEEE floating point
+ * representation.
+ * Will be exact from 0 to 2^24. Above that, we round towards zero
+ * as the fractional bits will not fit in a float. (It would be better to
+ * round towards even as the fpu does, but that is slower.)
+ */
+#define I2F_FRAC_BITS 23
+#define I2F_MASK ((1 << I2F_FRAC_BITS) - 1)
+static u32 msi3101_convert_sample_252(struct msi3101_state *s, u16 x)
+{
+ u32 msb, exponent, fraction, sign;
+
+ /* Zero is special */
+ if (!x)
+ return 0;
+
+ /* Negative / positive value */
+ if (x & (1 << 13)) {
+ x = -x;
+ x &= 0x1fff; /* result is 13 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_252(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 += 4) {
+ sample[0] = src[j + 0] >> 0 | src[j + 1] << 8;
+ sample[1] = src[j + 2] >> 0 | src[j + 3] << 8;
+
+ *dst++ = msi3101_convert_sample_252(s, sample[0]);
+ *dst++ = msi3101_convert_sample_252(s, sample[1]);
+ }
+ /* 252 x I+Q 32bit float samples */
+ dst_len += 252 * 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 * 252) */
+ s->next_sample = sample_num[i_max - 1] + 252;
+
+ return dst_len;
+}
+
/*
* This gets called for the Isochronous pipe (stream). This is done in interrupt
* time, so it has to be fast, not crash, and not stall. Neat.
/* Compact data */
for (i = 0; i < urb->number_of_packets; i++) {
+ void *ptr;
+
/* Check frame error */
fstatus = urb->iso_frame_desc[i].status;
if (fstatus) {
/* fill framebuffer */
#ifdef MSI3101_CONVERT_IN_URB_HANDLER
- vb2_set_plane_payload(&fbuf->vb, 0,
- msi3101_convert_stream(s,
- vb2_plane_vaddr(&fbuf->vb, 0), iso_buf, flen));
+ ptr = vb2_plane_vaddr(&fbuf->vb, 0);
+ flen = s->convert_stream(s, ptr, iso_buf, flen);
+ vb2_set_plane_payload(&fbuf->vb, 0, flen);
#else
memcpy(fbuf->data, iso_buf, flen);
fbuf->filled = flen;
container_of(vb, struct msi3101_frame_buf, vb);
int ret;
u32 *dst = vb2_plane_vaddr(&fbuf->vb, 0);
- ret = msi3101_convert_stream(s, dst, fbuf->data, fbuf->filled);
+ ret = msi3101_convert_stream_384(s, dst, fbuf->data, fbuf->filled);
vb2_set_plane_payload(&fbuf->vb, 0, ret);
return 0;
}
static int msi3101_set_usb_adc(struct msi3101_state *s)
{
int ret, div_n, div_m, div_r_out, f_sr, f_vco, fract;
- u32 reg4, reg3;
+ u32 reg3, reg4, reg7;
+
+ f_sr = s->ctrl_sampling_rate->val64;
+
+ /* select stream format */
+ if (f_sr < 6000000) {
+ s->convert_stream = msi3101_convert_stream_252;
+ reg7 = 0x00009407;
+ } else {
+ s->convert_stream = msi3101_convert_stream_384;
+ reg7 = 0x0000a507;
+ }
+
/*
* Synthesizer config is just a educated guess...
*
*
* VCO 202000000 - 720000000++
*/
-
- f_sr = s->ctrl_sampling_rate->val64;
reg3 = 0x01c00303;
reg4 = 0x00000004;
if (ret)
goto err;
- ret = msi3101_ctrl_msg(s, CMD_WREG, 0x0000a507);
+ ret = msi3101_ctrl_msg(s, CMD_WREG, reg7);
if (ret)
goto err;
projects / openwrt / staging / blogic.git / commitdiff