319 lines
7.2 KiB
C
319 lines
7.2 KiB
C
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/*
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* Driver for the ov7660 sensor
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*
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* Copyright (C) 2009 Erik Andrén
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* Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
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* Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
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*
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* Portions of code to USB interface and ALi driver software,
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* Copyright (c) 2006 Willem Duinker
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* v4l2 interface modeled after the V4L2 driver
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* for SN9C10x PC Camera Controllers
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include "m5602_ov7660.h"
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static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl);
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static void ov7660_dump_registers(struct sd *sd);
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static struct v4l2_pix_format ov7660_modes[] = {
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{
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640,
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480,
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V4L2_PIX_FMT_SBGGR8,
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V4L2_FIELD_NONE,
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.sizeimage =
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640 * 480,
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.bytesperline = 640,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.priv = 0
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}
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};
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static const struct v4l2_ctrl_ops ov7660_ctrl_ops = {
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.s_ctrl = ov7660_s_ctrl,
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};
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int ov7660_probe(struct sd *sd)
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{
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int err = 0, i;
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u8 prod_id = 0, ver_id = 0;
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if (force_sensor) {
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if (force_sensor == OV7660_SENSOR) {
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pr_info("Forcing an %s sensor\n", ov7660.name);
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goto sensor_found;
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}
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/* If we want to force another sensor,
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don't try to probe this one */
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return -ENODEV;
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}
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/* Do the preinit */
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for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
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u8 data[2];
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if (preinit_ov7660[i][0] == BRIDGE) {
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err = m5602_write_bridge(sd,
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preinit_ov7660[i][1],
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preinit_ov7660[i][2]);
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} else {
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data[0] = preinit_ov7660[i][2];
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err = m5602_write_sensor(sd,
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preinit_ov7660[i][1], data, 1);
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}
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}
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if (err < 0)
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return err;
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if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
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return -ENODEV;
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if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
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return -ENODEV;
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pr_info("Sensor reported 0x%x%x\n", prod_id, ver_id);
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if ((prod_id == 0x76) && (ver_id == 0x60)) {
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pr_info("Detected a ov7660 sensor\n");
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goto sensor_found;
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}
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return -ENODEV;
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sensor_found:
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sd->gspca_dev.cam.cam_mode = ov7660_modes;
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sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
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return 0;
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}
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int ov7660_init(struct sd *sd)
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{
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int i, err;
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/* Init the sensor */
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for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
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u8 data[2];
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if (init_ov7660[i][0] == BRIDGE) {
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err = m5602_write_bridge(sd,
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init_ov7660[i][1],
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init_ov7660[i][2]);
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} else {
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data[0] = init_ov7660[i][2];
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err = m5602_write_sensor(sd,
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init_ov7660[i][1], data, 1);
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}
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if (err < 0)
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return err;
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}
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if (dump_sensor)
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ov7660_dump_registers(sd);
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return 0;
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}
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int ov7660_init_controls(struct sd *sd)
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{
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struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
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sd->gspca_dev.vdev.ctrl_handler = hdl;
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v4l2_ctrl_handler_init(hdl, 6);
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v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
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0, 1, 1, 1);
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v4l2_ctrl_new_std_menu(hdl, &ov7660_ctrl_ops,
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V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO);
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sd->autogain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops,
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V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
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sd->gain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_GAIN, 0,
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255, 1, OV7660_DEFAULT_GAIN);
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sd->hflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_HFLIP,
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0, 1, 1, 0);
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sd->vflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_VFLIP,
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0, 1, 1, 0);
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if (hdl->error) {
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pr_err("Could not initialize controls\n");
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return hdl->error;
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}
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v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, false);
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v4l2_ctrl_cluster(2, &sd->hflip);
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return 0;
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}
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int ov7660_start(struct sd *sd)
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{
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return 0;
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}
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int ov7660_stop(struct sd *sd)
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{
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return 0;
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}
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void ov7660_disconnect(struct sd *sd)
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{
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ov7660_stop(sd);
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sd->sensor = NULL;
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}
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static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
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{
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int err;
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u8 i2c_data = val;
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struct sd *sd = (struct sd *) gspca_dev;
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PDEBUG(D_CONF, "Setting gain to %d", val);
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err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
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return err;
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}
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static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
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__s32 val)
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{
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int err;
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u8 i2c_data;
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struct sd *sd = (struct sd *) gspca_dev;
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PDEBUG(D_CONF, "Set auto white balance to %d", val);
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err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
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if (err < 0)
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return err;
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i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
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err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
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return err;
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}
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static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
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{
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int err;
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u8 i2c_data;
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struct sd *sd = (struct sd *) gspca_dev;
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PDEBUG(D_CONF, "Set auto gain control to %d", val);
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err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
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if (err < 0)
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return err;
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i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
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return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
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}
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static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
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__s32 val)
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{
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int err;
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u8 i2c_data;
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struct sd *sd = (struct sd *) gspca_dev;
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PDEBUG(D_CONF, "Set auto exposure control to %d", val);
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err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
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if (err < 0)
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return err;
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val = (val == V4L2_EXPOSURE_AUTO);
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i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
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return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
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}
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static int ov7660_set_hvflip(struct gspca_dev *gspca_dev)
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{
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int err;
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u8 i2c_data;
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struct sd *sd = (struct sd *) gspca_dev;
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PDEBUG(D_CONF, "Set hvflip to %d, %d", sd->hflip->val, sd->vflip->val);
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i2c_data = (sd->hflip->val << 5) | (sd->vflip->val << 4);
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err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
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return err;
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}
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static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct gspca_dev *gspca_dev =
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container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
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struct sd *sd = (struct sd *) gspca_dev;
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int err;
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if (!gspca_dev->streaming)
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return 0;
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switch (ctrl->id) {
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case V4L2_CID_AUTO_WHITE_BALANCE:
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err = ov7660_set_auto_white_balance(gspca_dev, ctrl->val);
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break;
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case V4L2_CID_EXPOSURE_AUTO:
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err = ov7660_set_auto_exposure(gspca_dev, ctrl->val);
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break;
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case V4L2_CID_AUTOGAIN:
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err = ov7660_set_auto_gain(gspca_dev, ctrl->val);
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if (err || ctrl->val)
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return err;
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err = ov7660_set_gain(gspca_dev, sd->gain->val);
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break;
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case V4L2_CID_HFLIP:
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err = ov7660_set_hvflip(gspca_dev);
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break;
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default:
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return -EINVAL;
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}
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return err;
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}
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static void ov7660_dump_registers(struct sd *sd)
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{
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int address;
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pr_info("Dumping the ov7660 register state\n");
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for (address = 0; address < 0xa9; address++) {
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u8 value;
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m5602_read_sensor(sd, address, &value, 1);
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pr_info("register 0x%x contains 0x%x\n", address, value);
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}
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pr_info("ov7660 register state dump complete\n");
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pr_info("Probing for which registers that are read/write\n");
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for (address = 0; address < 0xff; address++) {
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u8 old_value, ctrl_value;
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u8 test_value[2] = {0xff, 0xff};
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m5602_read_sensor(sd, address, &old_value, 1);
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m5602_write_sensor(sd, address, test_value, 1);
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m5602_read_sensor(sd, address, &ctrl_value, 1);
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if (ctrl_value == test_value[0])
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pr_info("register 0x%x is writeable\n", address);
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else
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pr_info("register 0x%x is read only\n", address);
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/* Restore original value */
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m5602_write_sensor(sd, address, &old_value, 1);
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}
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}
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