drivers/media/usb/gspca/stv06xx/stv06xx_st6422.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/gspca/stv06xx/stv06xx_st6422.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/gspca/stv06xx/stv06xx_st6422.c
Extension
.c
Size
6584 bytes
Lines
274
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Support for the sensor part which is integrated (I think) into the
 * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
 * but instead direct bridge writes.
 *
 * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
 *
 * Strongly based on qc-usb-messenger, which is:
 * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
 *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
 * Copyright (c) 2002, 2003 Tuukka Toivonen
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "stv06xx_st6422.h"

static struct v4l2_pix_format st6422_mode[] = {
	/* Note we actually get 124 lines of data, of which we skip the 4st
	   4 as they are garbage */
	{
		162,
		120,
		V4L2_PIX_FMT_SGRBG8,
		V4L2_FIELD_NONE,
		.sizeimage = 162 * 120,
		.bytesperline = 162,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 1
	},
	/* Note we actually get 248 lines of data, of which we skip the 4st
	   4 as they are garbage, and we tell the app it only gets the
	   first 240 of the 244 lines it actually gets, so that it ignores
	   the last 4. */
	{
		324,
		240,
		V4L2_PIX_FMT_SGRBG8,
		V4L2_FIELD_NONE,
		.sizeimage = 324 * 244,
		.bytesperline = 324,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0
	},
};

/* V4L2 controls supported by the driver */
static int setbrightness(struct sd *sd, s32 val);
static int setcontrast(struct sd *sd, s32 val);
static int setgain(struct sd *sd, u8 gain);
static int setexposure(struct sd *sd, s16 expo);

static int st6422_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct gspca_dev *gspca_dev =
		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
	struct sd *sd = (struct sd *)gspca_dev;
	int err = -EINVAL;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		err = setbrightness(sd, ctrl->val);
		break;
	case V4L2_CID_CONTRAST:
		err = setcontrast(sd, ctrl->val);
		break;
	case V4L2_CID_GAIN:
		err = setgain(sd, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE:
		err = setexposure(sd, ctrl->val);
		break;
	}

	/* commit settings */
	if (err >= 0)
		err = stv06xx_write_bridge(sd, 0x143f, 0x01);
	sd->gspca_dev.usb_err = err;
	return err;
}

static const struct v4l2_ctrl_ops st6422_ctrl_ops = {
	.s_ctrl = st6422_s_ctrl,
};

static int st6422_init_controls(struct sd *sd)
{
	struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;

Annotation

Implementation Notes