linux/drivers/media/usb/gspca/stv06xx/stv06xx_st6422.c
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   1/*
   2 * Support for the sensor part which is integrated (I think) into the
   3 * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
   4 * but instead direct bridge writes.
   5 *
   6 * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
   7 *
   8 * Strongly based on qc-usb-messenger, which is:
   9 * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
  10 *                    Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
  11 * Copyright (c) 2002, 2003 Tuukka Toivonen
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 */
  24
  25#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  26
  27#include "stv06xx_st6422.h"
  28
  29static struct v4l2_pix_format st6422_mode[] = {
  30        /* Note we actually get 124 lines of data, of which we skip the 4st
  31           4 as they are garbage */
  32        {
  33                162,
  34                120,
  35                V4L2_PIX_FMT_SGRBG8,
  36                V4L2_FIELD_NONE,
  37                .sizeimage = 162 * 120,
  38                .bytesperline = 162,
  39                .colorspace = V4L2_COLORSPACE_SRGB,
  40                .priv = 1
  41        },
  42        /* Note we actually get 248 lines of data, of which we skip the 4st
  43           4 as they are garbage, and we tell the app it only gets the
  44           first 240 of the 244 lines it actually gets, so that it ignores
  45           the last 4. */
  46        {
  47                324,
  48                240,
  49                V4L2_PIX_FMT_SGRBG8,
  50                V4L2_FIELD_NONE,
  51                .sizeimage = 324 * 244,
  52                .bytesperline = 324,
  53                .colorspace = V4L2_COLORSPACE_SRGB,
  54                .priv = 0
  55        },
  56};
  57
  58/* V4L2 controls supported by the driver */
  59static int setbrightness(struct sd *sd, s32 val);
  60static int setcontrast(struct sd *sd, s32 val);
  61static int setgain(struct sd *sd, u8 gain);
  62static int setexposure(struct sd *sd, s16 expo);
  63
  64static int st6422_s_ctrl(struct v4l2_ctrl *ctrl)
  65{
  66        struct gspca_dev *gspca_dev =
  67                container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
  68        struct sd *sd = (struct sd *)gspca_dev;
  69        int err = -EINVAL;
  70
  71        switch (ctrl->id) {
  72        case V4L2_CID_BRIGHTNESS:
  73                err = setbrightness(sd, ctrl->val);
  74                break;
  75        case V4L2_CID_CONTRAST:
  76                err = setcontrast(sd, ctrl->val);
  77                break;
  78        case V4L2_CID_GAIN:
  79                err = setgain(sd, ctrl->val);
  80                break;
  81        case V4L2_CID_EXPOSURE:
  82                err = setexposure(sd, ctrl->val);
  83                break;
  84        }
  85
  86        /* commit settings */
  87        if (err >= 0)
  88                err = stv06xx_write_bridge(sd, 0x143f, 0x01);
  89        sd->gspca_dev.usb_err = err;
  90        return err;
  91}
  92
  93static const struct v4l2_ctrl_ops st6422_ctrl_ops = {
  94        .s_ctrl = st6422_s_ctrl,
  95};
  96
  97static int st6422_init_controls(struct sd *sd)
  98{
  99        struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
 100
 101        v4l2_ctrl_handler_init(hdl, 4);
 102        v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
 103                        V4L2_CID_BRIGHTNESS, 0, 31, 1, 3);
 104        v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
 105                        V4L2_CID_CONTRAST, 0, 15, 1, 11);
 106        v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
 107                        V4L2_CID_EXPOSURE, 0, 1023, 1, 256);
 108        v4l2_ctrl_new_std(hdl, &st6422_ctrl_ops,
 109                        V4L2_CID_GAIN, 0, 255, 1, 64);
 110
 111        return hdl->error;
 112}
 113
 114static int st6422_probe(struct sd *sd)
 115{
 116        if (sd->bridge != BRIDGE_ST6422)
 117                return -ENODEV;
 118
 119        pr_info("st6422 sensor detected\n");
 120
 121        sd->gspca_dev.cam.cam_mode = st6422_mode;
 122        sd->gspca_dev.cam.nmodes = ARRAY_SIZE(st6422_mode);
 123        return 0;
 124}
 125
 126static int st6422_init(struct sd *sd)
 127{
 128        int err = 0, i;
 129
 130        const u16 st6422_bridge_init[][2] = {
 131                { STV_ISO_ENABLE, 0x00 }, /* disable capture */
 132                { 0x1436, 0x00 },
 133                { 0x1432, 0x03 },       /* 0x00-0x1F brightness */
 134                { 0x143a, 0xf9 },       /* 0x00-0x0F contrast */
 135                { 0x0509, 0x38 },       /* R */
 136                { 0x050a, 0x38 },       /* G */
 137                { 0x050b, 0x38 },       /* B */
 138                { 0x050c, 0x2a },
 139                { 0x050d, 0x01 },
 140
 141
 142                { 0x1431, 0x00 },       /* 0x00-0x07 ??? */
 143                { 0x1433, 0x34 },       /* 160x120, 0x00-0x01 night filter */
 144                { 0x1438, 0x18 },       /* 640x480 */
 145/* 18 bayes */
 146/* 10 compressed? */
 147
 148                { 0x1439, 0x00 },
 149/* anti-noise?  0xa2 gives a perfect image */
 150
 151                { 0x143b, 0x05 },
 152                { 0x143c, 0x00 },       /* 0x00-0x01 - ??? */
 153
 154
 155/* shutter time 0x0000-0x03FF */
 156/* low value  give good picures on moving objects (but requires much light) */
 157/* high value gives good picures in darkness (but tends to be overexposed) */
 158                { 0x143e, 0x01 },
 159                { 0x143d, 0x00 },
 160
 161                { 0x1442, 0xe2 },
 162/* write: 1x1x xxxx */
 163/* read:  1x1x xxxx */
 164/*        bit 5 == button pressed and hold if 0 */
 165/* write 0xe2,0xea */
 166
 167/* 0x144a */
 168/* 0x00 init */
 169/* bit 7 == button has been pressed, but not handled */
 170
 171/* interrupt */
 172/* if(urb->iso_frame_desc[i].status == 0x80) { */
 173/* if(urb->iso_frame_desc[i].status == 0x88) { */
 174
 175                { 0x1500, 0xd0 },
 176                { 0x1500, 0xd0 },
 177                { 0x1500, 0x50 },       /* 0x00 - 0xFF  0x80 == compr ? */
 178
 179                { 0x1501, 0xaf },
 180/* high val-> light area gets darker */
 181/* low val -> light area gets lighter */
 182                { 0x1502, 0xc2 },
 183/* high val-> light area gets darker */
 184/* low val -> light area gets lighter */
 185                { 0x1503, 0x45 },
 186/* high val-> light area gets darker */
 187/* low val -> light area gets lighter */
 188                { 0x1505, 0x02 },
 189/* 2  : 324x248  80352 bytes */
 190/* 7  : 248x162  40176 bytes */
 191/* c+f: 162*124  20088 bytes */
 192
 193                { 0x150e, 0x8e },
 194                { 0x150f, 0x37 },
 195                { 0x15c0, 0x00 },
 196                { 0x15c3, 0x08 },       /* 0x04/0x14 ... test pictures ??? */
 197
 198
 199                { 0x143f, 0x01 },       /* commit settings */
 200
 201        };
 202
 203        for (i = 0; i < ARRAY_SIZE(st6422_bridge_init) && !err; i++) {
 204                err = stv06xx_write_bridge(sd, st6422_bridge_init[i][0],
 205                                               st6422_bridge_init[i][1]);
 206        }
 207
 208        return err;
 209}
 210
 211static int setbrightness(struct sd *sd, s32 val)
 212{
 213        /* val goes from 0 -> 31 */
 214        return stv06xx_write_bridge(sd, 0x1432, val);
 215}
 216
 217static int setcontrast(struct sd *sd, s32 val)
 218{
 219        /* Val goes from 0 -> 15 */
 220        return stv06xx_write_bridge(sd, 0x143a, val | 0xf0);
 221}
 222
 223static int setgain(struct sd *sd, u8 gain)
 224{
 225        int err;
 226
 227        /* Set red, green, blue, gain */
 228        err = stv06xx_write_bridge(sd, 0x0509, gain);
 229        if (err < 0)
 230                return err;
 231
 232        err = stv06xx_write_bridge(sd, 0x050a, gain);
 233        if (err < 0)
 234                return err;
 235
 236        err = stv06xx_write_bridge(sd, 0x050b, gain);
 237        if (err < 0)
 238                return err;
 239
 240        /* 2 mystery writes */
 241        err = stv06xx_write_bridge(sd, 0x050c, 0x2a);
 242        if (err < 0)
 243                return err;
 244
 245        return stv06xx_write_bridge(sd, 0x050d, 0x01);
 246}
 247
 248static int setexposure(struct sd *sd, s16 expo)
 249{
 250        int err;
 251
 252        err = stv06xx_write_bridge(sd, 0x143d, expo & 0xff);
 253        if (err < 0)
 254                return err;
 255
 256        return stv06xx_write_bridge(sd, 0x143e, expo >> 8);
 257}
 258
 259static int st6422_start(struct sd *sd)
 260{
 261        int err;
 262        struct cam *cam = &sd->gspca_dev.cam;
 263
 264        if (cam->cam_mode[sd->gspca_dev.curr_mode].priv)
 265                err = stv06xx_write_bridge(sd, 0x1505, 0x0f);
 266        else
 267                err = stv06xx_write_bridge(sd, 0x1505, 0x02);
 268        if (err < 0)
 269                return err;
 270
 271        /* commit settings */
 272        err = stv06xx_write_bridge(sd, 0x143f, 0x01);
 273        return (err < 0) ? err : 0;
 274}
 275
 276static int st6422_stop(struct sd *sd)
 277{
 278        struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
 279
 280        gspca_dbg(gspca_dev, D_STREAM, "Halting stream\n");
 281
 282        return 0;
 283}
 284