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Commit 00e049b0 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] msi3101: a lot of small cleanups 

Add comments, remove useless code and so. House cleaning party.
Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 093cdc79
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drivers/staging/media/msi3101/sdr-msi3101.c
View file @ 00e049b0
......@@ -16,20 +16,36 @@
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* That driver is somehow based of pwc driver:
* (C) 1999-2004 Nemosoft Unv.
* (C) 2004-2006 Luc Saillard (luc@saillard.org)
* (C) 2011 Hans de Goede <hdegoede@redhat.com>
*
* Development tree of that driver will be on:
* http://git.linuxtv.org/anttip/media_tree.git/shortlog/refs/heads/mirics
*
* GNU Radio plugin "gr-kernel" for device usage will be on:
* http://git.linuxtv.org/anttip/gr-kernel.git
*
* TODO:
* I will look these:
* - split RF tuner and USB ADC interface to own drivers (msi2500 and msi001)
* - move controls to V4L2 API
*
* Help is very highly welcome for these + all the others you could imagine:
* - use libv4l2 for stream format conversions
* - gr-kernel: switch to v4l2_mmap (current read eats a lot of cpu)
* - SDRSharp support
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include <media/videobuf2-vmalloc.h>
struct msi3101_gain {
......@@ -358,9 +374,9 @@ static const struct msi3101_gain msi3101_gain_lut_1000[] = {
#define ISO_FRAMES_PER_DESC (8)
#define ISO_MAX_FRAME_SIZE (3 * 1024)
#define ISO_BUFFER_SIZE (ISO_FRAMES_PER_DESC * ISO_MAX_FRAME_SIZE)
#define MAX_ISOC_ERRORS 20
/* TODO: These should be moved to V4L2 API */
#define MSI3101_CID_SAMPLING_MODE ((V4L2_CID_USER_BASE | 0xf000) + 0)
#define MSI3101_CID_SAMPLING_RATE ((V4L2_CID_USER_BASE | 0xf000) + 1)
#define MSI3101_CID_SAMPLING_RESOLUTION ((V4L2_CID_USER_BASE | 0xf000) + 2)
......@@ -373,8 +389,6 @@ static const struct msi3101_gain msi3101_gain_lut_1000[] = {
struct msi3101_frame_buf {
struct vb2_buffer vb; /* common v4l buffer stuff -- must be first */
struct list_head list;
void *data; /* raw data from USB device */
int filled; /* number of bytes filled to *data */
};
struct msi3101_state {
......@@ -478,14 +492,19 @@ static struct msi3101_frame_buf *msi3101_get_next_fill_buf(
*/
/*
* Converts signed 10-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.)
* Integer to 32-bit IEEE floating point representation routine is taken
* from Radeon R600 driver (drivers/gpu/drm/radeon/r600_blit_kms.c).
*
* TODO: Currently we do conversion here in Kernel, but in future that will
* be moved to the libv4l2 library as video format conversions are.
*/
#define I2F_FRAC_BITS 23
#define I2F_MASK ((1 << I2F_FRAC_BITS) - 1)
/*
* Converts signed ~10+3-bit integer into 32-bit IEEE floating point
* representation.
*/
static u32 msi3101_convert_sample_384(struct msi3101_state *s, u16 x, int shift)
{
u32 msb, exponent, fraction, sign;
......@@ -510,35 +529,26 @@ static u32 msi3101_convert_sample_384(struct msi3101_state *s, u16 x, int shift)
/* 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;
}
#define MSI3101_CONVERT_IN_URB_HANDLER
#define MSI3101_EXTENSIVE_DEBUG
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;
u16 sample[4];
u32 bits;
#ifdef MSI3101_EXTENSIVE_DEBUG
u32 sample_num[3];
#endif
/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
for (i = 0; i < i_max; i++) {
#ifdef MSI3101_EXTENSIVE_DEBUG
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(&s->udev->dev,
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]);
......@@ -550,9 +560,7 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u32 *dst,
*/
dev_dbg_ratelimited(&s->udev->dev,
"%*ph %*ph\n", 12, &src[4], 24, &src[1000]);
memset(&src[4], 0, 12);
memset(&src[1000], 0, 24);
#endif
src += 16;
for (j = 0; j < 6; j++) {
bits = src[160 + 3] << 24 | src[160 + 2] << 16 | src[160 + 1] << 8 | src[160 + 0] << 0;
......@@ -567,22 +575,18 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u32 *dst,
*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;
}
src += 10;
}
#ifdef MSI3101_EXTENSIVE_DEBUG
dev_dbg_ratelimited(&s->udev->dev,
"sample control bits %08x\n", bits);
#endif
src += 4;
}
/* 384 x I+Q 32bit float samples */
dst_len += 384 * 2 * 4;
src += 24;
}
#ifdef MSI3101_EXTENSIVE_DEBUG
/* calculate samping rate and output it in 10 seconds intervals */
if ((s->jiffies + msecs_to_jiffies(10000)) <= jiffies) {
unsigned long jiffies_now = jiffies;
......@@ -600,7 +604,7 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u32 *dst,
/* next sample (sample = sample + i * 384) */
s->next_sample = sample_num[i_max - 1] + 384;
#endif
return dst_len;
}
......@@ -628,11 +632,6 @@ static u32 msi3101_convert_sample_336(struct msi3101_state *s, u16 x)
/* 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;
......@@ -699,12 +698,7 @@ static int msi3101_convert_stream_336(struct msi3101_state *s, u32 *dst,
/*
* 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;
......@@ -725,11 +719,6 @@ static u32 msi3101_convert_sample_252(struct msi3101_state *s, u16 x)
/* 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;
......@@ -832,7 +821,7 @@ static void msi3101_isoc_handler(struct urb *urb)
/* Check frame error */
fstatus = urb->iso_frame_desc[i].status;
if (fstatus) {
dev_dbg(&s->udev->dev,
dev_dbg_ratelimited(&s->udev->dev,
"frame=%d/%d has error %d skipping\n",
i, urb->number_of_packets, fstatus);
goto skip;
......@@ -856,14 +845,9 @@ static void msi3101_isoc_handler(struct urb *urb)
}
/* fill framebuffer */
#ifdef MSI3101_CONVERT_IN_URB_HANDLER
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;
#endif
vb2_buffer_done(&fbuf->vb, VB2_BUF_STATE_DONE);
skip:
;
......@@ -1063,20 +1047,6 @@ static int msi3101_queue_setup(struct vb2_queue *vq,
return 0;
}
static int msi3101_buf_init(struct vb2_buffer *vb)
{
struct msi3101_state *s = vb2_get_drv_priv(vb->vb2_queue);
struct msi3101_frame_buf *fbuf =
container_of(vb, struct msi3101_frame_buf, vb);
dev_dbg(&s->udev->dev, "%s:\n", __func__);
fbuf->data = vzalloc(ISO_MAX_FRAME_SIZE);
if (fbuf->data == NULL)
return -ENOMEM;
return 0;
}
static int msi3101_buf_prepare(struct vb2_buffer *vb)
{
struct msi3101_state *s = vb2_get_drv_priv(vb->vb2_queue);
......@@ -1088,34 +1058,6 @@ static int msi3101_buf_prepare(struct vb2_buffer *vb)
return 0;
}
#ifdef MSI3101_CONVERT_IN_URB_HANDLER
static int msi3101_buf_finish(struct vb2_buffer *vb)
{
return 0;
}
#else
static int msi3101_buf_finish(struct vb2_buffer *vb)
{
struct msi3101_state *s = vb2_get_drv_priv(vb->vb2_queue);
struct msi3101_frame_buf *fbuf =
container_of(vb, struct msi3101_frame_buf, vb);
int ret;
u32 *dst = vb2_plane_vaddr(&fbuf->vb, 0);
ret = msi3101_convert_stream_384(s, dst, fbuf->data, fbuf->filled);
vb2_set_plane_payload(&fbuf->vb, 0, ret);
return 0;
}
#endif
static void msi3101_buf_cleanup(struct vb2_buffer *vb)
{
struct msi3101_state *s = vb2_get_drv_priv(vb->vb2_queue);
struct msi3101_frame_buf *buf =
container_of(vb, struct msi3101_frame_buf, vb);
dev_dbg(&s->udev->dev, "%s:\n", __func__);
vfree(buf->data);
}
static void msi3101_buf_queue(struct vb2_buffer *vb)
{
struct msi3101_state *s = vb2_get_drv_priv(vb->vb2_queue);
......@@ -1544,10 +1486,7 @@ static int msi3101_stop_streaming(struct vb2_queue *vq)
static struct vb2_ops msi3101_vb2_ops = {
.queue_setup = msi3101_queue_setup,
.buf_init = msi3101_buf_init,
.buf_prepare = msi3101_buf_prepare,
.buf_finish = msi3101_buf_finish,
.buf_cleanup = msi3101_buf_cleanup,
.buf_queue = msi3101_buf_queue,
.start_streaming = msi3101_start_streaming,
.stop_streaming = msi3101_stop_streaming,
......@@ -1862,7 +1801,7 @@ static int msi3101_probe(struct usb_interface *intf,
/* USB device ID list */
static struct usb_device_id msi3101_id_table[] = {
{ USB_DEVICE(0x1df7, 0x2500) },
{ USB_DEVICE(0x1df7, 0x2500) }, /* Mirics MSi3101 SDR Dongle */
{ USB_DEVICE(0x2040, 0xd300) }, /* Hauppauge WinTV 133559 LF */
{ }
};
......
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