kernel/drivers/media/usb/gspca/m5602/m5602_ov7660.c

   1 /*
   2  * Driver for the ov7660 sensor
   3  *
   4  * Copyright (C) 2009 Erik Andrén
   5  * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
   6  * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
   7  *
   8  * Portions of code to USB interface and ALi driver software,
   9  * Copyright (c) 2006 Willem Duinker
  10  * v4l2 interface modeled after the V4L2 driver
  11  * for SN9C10x PC Camera Controllers
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation, version 2.
  16  *
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include "m5602_ov7660.h"
  22
  23 static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl);
  24 static void ov7660_dump_registers(struct sd *sd);
  25
  26 static struct v4l2_pix_format ov7660_modes[] = {
  27         {
  28                 640,
  29                 480,
  30                 V4L2_PIX_FMT_SBGGR8,
  31                 V4L2_FIELD_NONE,
  32                 .sizeimage =
  33                         640 * 480,
  34                 .bytesperline = 640,
  35                 .colorspace = V4L2_COLORSPACE_SRGB,
  36                 .priv = 0
  37         }
  38 };
  39
  40 static const struct v4l2_ctrl_ops ov7660_ctrl_ops = {
  41         .s_ctrl = ov7660_s_ctrl,
  42 };
  43
  44 int ov7660_probe(struct sd *sd)
  45 {
  46         int err = 0, i;
  47         u8 prod_id = 0, ver_id = 0;
  48
  49         if (force_sensor) {
  50                 if (force_sensor == OV7660_SENSOR) {
  51                         pr_info("Forcing an %s sensor\n", ov7660.name);
  52                         goto sensor_found;
  53                 }
  54                 /* If we want to force another sensor,
  55                 don't try to probe this one */
  56                 return -ENODEV;
  57         }
  58
  59         /* Do the preinit */
  60         for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
  61                 u8 data[2];
  62
  63                 if (preinit_ov7660[i][0] == BRIDGE) {
  64                         err = m5602_write_bridge(sd,
  65                                 preinit_ov7660[i][1],
  66                                 preinit_ov7660[i][2]);
  67                 } else {
  68                         data[0] = preinit_ov7660[i][2];
  69                         err = m5602_write_sensor(sd,
  70                                 preinit_ov7660[i][1], data, 1);
  71                 }
  72         }
  73         if (err < 0)
  74                 return err;
  75
  76         if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
  77                 return -ENODEV;
  78
  79         if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
  80                 return -ENODEV;
  81
  82         pr_info("Sensor reported 0x%x%x\n", prod_id, ver_id);
  83
  84         if ((prod_id == 0x76) && (ver_id == 0x60)) {
  85                 pr_info("Detected a ov7660 sensor\n");
  86                 goto sensor_found;
  87         }
  88         return -ENODEV;
  89
  90 sensor_found:
  91         sd->gspca_dev.cam.cam_mode = ov7660_modes;
  92         sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
  93
  94         return 0;
  95 }
  96
  97 int ov7660_init(struct sd *sd)
  98 {
  99         int i, err;
 100
 101         /* Init the sensor */
 102         for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
 103                 u8 data[2];
 104
 105                 if (init_ov7660[i][0] == BRIDGE) {
 106                         err = m5602_write_bridge(sd,
 107                                 init_ov7660[i][1],
 108                                 init_ov7660[i][2]);
 109                 } else {
 110                         data[0] = init_ov7660[i][2];
 111                         err = m5602_write_sensor(sd,
 112                                 init_ov7660[i][1], data, 1);
 113                 }
 114                 if (err < 0)
 115                         return err;
 116         }
 117
 118         if (dump_sensor)
 119                 ov7660_dump_registers(sd);
 120
 121         return 0;
 122 }
 123
 124 int ov7660_init_controls(struct sd *sd)
 125 {
 126         struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
 127
 128         sd->gspca_dev.vdev.ctrl_handler = hdl;
 129         v4l2_ctrl_handler_init(hdl, 6);
 130
 131         v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
 132                           0, 1, 1, 1);
 133         v4l2_ctrl_new_std_menu(hdl, &ov7660_ctrl_ops,
 134                           V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO);
 135
 136         sd->autogain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops,
 137                                          V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
 138         sd->gain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_GAIN, 0,
 139                                      255, 1, OV7660_DEFAULT_GAIN);
 140
 141         sd->hflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_HFLIP,
 142                                       0, 1, 1, 0);
 143         sd->vflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_VFLIP,
 144                                       0, 1, 1, 0);
 145
 146         if (hdl->error) {
 147                 pr_err("Could not initialize controls\n");
 148                 return hdl->error;
 149         }
 150
 151         v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, false);
 152         v4l2_ctrl_cluster(2, &sd->hflip);
 153
 154         return 0;
 155 }
 156
 157 int ov7660_start(struct sd *sd)
 158 {
 159         return 0;
 160 }
 161
 162 int ov7660_stop(struct sd *sd)
 163 {
 164         return 0;
 165 }
 166
 167 void ov7660_disconnect(struct sd *sd)
 168 {
 169         ov7660_stop(sd);
 170
 171         sd->sensor = NULL;
 172 }
 173
 174 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 175 {
 176         int err;
 177         u8 i2c_data = val;
 178         struct sd *sd = (struct sd *) gspca_dev;
 179
 180         PDEBUG(D_CONF, "Setting gain to %d", val);
 181
 182         err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
 183         return err;
 184 }
 185
 186 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
 187                                          __s32 val)
 188 {
 189         int err;
 190         u8 i2c_data;
 191         struct sd *sd = (struct sd *) gspca_dev;
 192
 193         PDEBUG(D_CONF, "Set auto white balance to %d", val);
 194
 195         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 196         if (err < 0)
 197                 return err;
 198
 199         i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
 200         err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 201
 202         return err;
 203 }
 204
 205 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
 206 {
 207         int err;
 208         u8 i2c_data;
 209         struct sd *sd = (struct sd *) gspca_dev;
 210
 211         PDEBUG(D_CONF, "Set auto gain control to %d", val);
 212
 213         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 214         if (err < 0)
 215                 return err;
 216
 217         i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
 218
 219         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 220 }
 221
 222 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
 223                                     __s32 val)
 224 {
 225         int err;
 226         u8 i2c_data;
 227         struct sd *sd = (struct sd *) gspca_dev;
 228
 229         PDEBUG(D_CONF, "Set auto exposure control to %d", val);
 230
 231         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 232         if (err < 0)
 233                 return err;
 234
 235         val = (val == V4L2_EXPOSURE_AUTO);
 236         i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
 237
 238         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 239 }
 240
 241 static int ov7660_set_hvflip(struct gspca_dev *gspca_dev)
 242 {
 243         int err;
 244         u8 i2c_data;
 245         struct sd *sd = (struct sd *) gspca_dev;
 246
 247         PDEBUG(D_CONF, "Set hvflip to %d, %d", sd->hflip->val, sd->vflip->val);
 248
 249         i2c_data = (sd->hflip->val << 5) | (sd->vflip->val << 4);
 250
 251         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 252
 253         return err;
 254 }
 255
 256 static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl)
 257 {
 258         struct gspca_dev *gspca_dev =
 259                 container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 260         struct sd *sd = (struct sd *) gspca_dev;
 261         int err;
 262
 263         if (!gspca_dev->streaming)
 264                 return 0;
 265
 266         switch (ctrl->id) {
 267         case V4L2_CID_AUTO_WHITE_BALANCE:
 268                 err = ov7660_set_auto_white_balance(gspca_dev, ctrl->val);
 269                 break;
 270         case V4L2_CID_EXPOSURE_AUTO:
 271                 err = ov7660_set_auto_exposure(gspca_dev, ctrl->val);
 272                 break;
 273         case V4L2_CID_AUTOGAIN:
 274                 err = ov7660_set_auto_gain(gspca_dev, ctrl->val);
 275                 if (err || ctrl->val)
 276                         return err;
 277                 err = ov7660_set_gain(gspca_dev, sd->gain->val);
 278                 break;
 279         case V4L2_CID_HFLIP:
 280                 err = ov7660_set_hvflip(gspca_dev);
 281                 break;
 282         default:
 283                 return -EINVAL;
 284         }
 285
 286         return err;
 287 }
 288
 289 static void ov7660_dump_registers(struct sd *sd)
 290 {
 291         int address;
 292         pr_info("Dumping the ov7660 register state\n");
 293         for (address = 0; address < 0xa9; address++) {
 294                 u8 value;
 295                 m5602_read_sensor(sd, address, &value, 1);
 296                 pr_info("register 0x%x contains 0x%x\n", address, value);
 297         }
 298
 299         pr_info("ov7660 register state dump complete\n");
 300
 301         pr_info("Probing for which registers that are read/write\n");
 302         for (address = 0; address < 0xff; address++) {
 303                 u8 old_value, ctrl_value;
 304                 u8 test_value[2] = {0xff, 0xff};
 305
 306                 m5602_read_sensor(sd, address, &old_value, 1);
 307                 m5602_write_sensor(sd, address, test_value, 1);
 308                 m5602_read_sensor(sd, address, &ctrl_value, 1);
 309
 310                 if (ctrl_value == test_value[0])
 311                         pr_info("register 0x%x is writeable\n", address);
 312                 else
 313                         pr_info("register 0x%x is read only\n", address);
 314
 315                 /* Restore original value */
 316                 m5602_write_sensor(sd, address, &old_value, 1);
 317         }
 318 }