linux/drivers/media/common/saa7146/saa7146_hlp.c

// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/export.h>
#include <media/drv-intf/saa7146_vv.h>

static void calculate_output_format_register(struct saa7146_dev* saa, u32 palette, u32* clip_format)
{ … }

static void calculate_hps_source_and_sync(struct saa7146_dev *dev, int source, int sync, u32* hps_ctrl)
{ … }

static void calculate_hxo_and_hyo(struct saa7146_vv *vv, u32* hps_h_scale, u32* hps_ctrl)
{ … }

/* helper functions for the calculation of the horizontal- and vertical
   scaling registers, clip-format-register etc ...
   these functions take pointers to the (most-likely read-out
   original-values) and manipulate them according to the requested
   changes.
*/

/* hps_coeff used for CXY and CXUV; scale 1/1 -> scale 1/64 */
static struct { … } hps_h_coeff_tab [] = …;

/* table of attenuation values for horizontal scaling */
static u8 h_attenuation[] = …;

/* calculate horizontal scale registers */
static int calculate_h_scale_registers(struct saa7146_dev *dev,
	int in_x, int out_x, int flip_lr,
	u32* hps_ctrl, u32* hps_v_gain, u32* hps_h_prescale, u32* hps_h_scale)
{ … }

static struct { … } hps_v_coeff_tab [] = …;

/* table of attenuation values for vertical scaling */
static u16 v_attenuation[] = …;

/* calculate vertical scale registers */
static int calculate_v_scale_registers(struct saa7146_dev *dev, enum v4l2_field field,
	int in_y, int out_y, u32* hps_v_scale, u32* hps_v_gain)
{ … }

/* simple bubble-sort algorithm with duplicate elimination */
static void saa7146_set_window(struct saa7146_dev *dev, int width, int height, enum v4l2_field field)
{ … }

static void saa7146_set_output_format(struct saa7146_dev *dev, unsigned long palette)
{ … }

/* select input-source */
void saa7146_set_hps_source_and_sync(struct saa7146_dev *dev, int source, int sync)
{ … }
EXPORT_SYMBOL_GPL(…);

void saa7146_write_out_dma(struct saa7146_dev* dev, int which, struct saa7146_video_dma* vdma)
{ … }

static int calculate_video_dma_grab_packed(struct saa7146_dev* dev, struct saa7146_buf *buf)
{ … }

static int calc_planar_422(struct saa7146_vv *vv, struct saa7146_buf *buf, struct saa7146_video_dma *vdma2, struct saa7146_video_dma *vdma3)
{ … }

static int calc_planar_420(struct saa7146_vv *vv, struct saa7146_buf *buf, struct saa7146_video_dma *vdma2, struct saa7146_video_dma *vdma3)
{ … }

static int calculate_video_dma_grab_planar(struct saa7146_dev* dev, struct saa7146_buf *buf)
{ … }

static void program_capture_engine(struct saa7146_dev *dev, int planar)
{ … }

/* disable clipping */
static void saa7146_disable_clipping(struct saa7146_dev *dev)
{ … }

void saa7146_set_capture(struct saa7146_dev *dev, struct saa7146_buf *buf, struct saa7146_buf *next)
{ … }