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 = 0;
 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         }
 115
 116         if (dump_sensor)
 117                 ov7660_dump_registers(sd);
 118
 119         return 0;
 120 }
 121
 122 int ov7660_init_controls(struct sd *sd)
 123 {
 124         struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
 125
 126         sd->gspca_dev.vdev.ctrl_handler = hdl;
 127         v4l2_ctrl_handler_init(hdl, 6);
 128
 129         v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
 130                           0, 1, 1, 1);
 131         v4l2_ctrl_new_std_menu(hdl, &ov7660_ctrl_ops,
 132                           V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO);
 133
 134         sd->autogain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops,
 135                                          V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
 136         sd->gain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_GAIN, 0,
 137                                      255, 1, OV7660_DEFAULT_GAIN);
 138
 139         sd->hflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_HFLIP,
 140                                       0, 1, 1, 0);
 141         sd->vflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_VFLIP,
 142                                       0, 1, 1, 0);
 143
 144         if (hdl->error) {
 145                 pr_err("Could not initialize controls\n");
 146                 return hdl->error;
 147         }
 148
 149         v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, false);
 150         v4l2_ctrl_cluster(2, &sd->hflip);
 151
 152         return 0;
 153 }
 154
 155 int ov7660_start(struct sd *sd)
 156 {
 157         return 0;
 158 }
 159
 160 int ov7660_stop(struct sd *sd)
 161 {
 162         return 0;
 163 }
 164
 165 void ov7660_disconnect(struct sd *sd)
 166 {
 167         ov7660_stop(sd);
 168
 169         sd->sensor = NULL;
 170 }
 171
 172 static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 173 {
 174         int err;
 175         u8 i2c_data = val;
 176         struct sd *sd = (struct sd *) gspca_dev;
 177
 178         PDEBUG(D_V4L2, "Setting gain to %d", val);
 179
 180         err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
 181         return err;
 182 }
 183
 184 static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
 185                                          __s32 val)
 186 {
 187         int err;
 188         u8 i2c_data;
 189         struct sd *sd = (struct sd *) gspca_dev;
 190
 191         PDEBUG(D_V4L2, "Set auto white balance to %d", val);
 192
 193         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 194         if (err < 0)
 195                 return err;
 196
 197         i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
 198         err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 199
 200         return err;
 201 }
 202
 203 static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
 204 {
 205         int err;
 206         u8 i2c_data;
 207         struct sd *sd = (struct sd *) gspca_dev;
 208
 209         PDEBUG(D_V4L2, "Set auto gain control to %d", val);
 210
 211         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 212         if (err < 0)
 213                 return err;
 214
 215         i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
 216
 217         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 218 }
 219
 220 static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
 221                                     __s32 val)
 222 {
 223         int err;
 224         u8 i2c_data;
 225         struct sd *sd = (struct sd *) gspca_dev;
 226
 227         PDEBUG(D_V4L2, "Set auto exposure control to %d", val);
 228
 229         err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
 230         if (err < 0)
 231                 return err;
 232
 233         val = (val == V4L2_EXPOSURE_AUTO);
 234         i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
 235
 236         return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
 237 }
 238
 239 static int ov7660_set_hvflip(struct gspca_dev *gspca_dev)
 240 {
 241         int err;
 242         u8 i2c_data;
 243         struct sd *sd = (struct sd *) gspca_dev;
 244
 245         PDEBUG(D_V4L2, "Set hvflip to %d, %d", sd->hflip->val, sd->vflip->val);
 246
 247         i2c_data = (sd->hflip->val << 5) | (sd->vflip->val << 4);
 248
 249         err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
 250
 251         return err;
 252 }
 253
 254 static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl)
 255 {
 256         struct gspca_dev *gspca_dev =
 257                 container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 258         struct sd *sd = (struct sd *) gspca_dev;
 259         int err;
 260
 261         if (!gspca_dev->streaming)
 262                 return 0;
 263
 264         switch (ctrl->id) {
 265         case V4L2_CID_AUTO_WHITE_BALANCE:
 266                 err = ov7660_set_auto_white_balance(gspca_dev, ctrl->val);
 267                 break;
 268         case V4L2_CID_EXPOSURE_AUTO:
 269                 err = ov7660_set_auto_exposure(gspca_dev, ctrl->val);
 270                 break;
 271         case V4L2_CID_AUTOGAIN:
 272                 err = ov7660_set_auto_gain(gspca_dev, ctrl->val);
 273                 if (err || ctrl->val)
 274                         return err;
 275                 err = ov7660_set_gain(gspca_dev, sd->gain->val);
 276                 break;
 277         case V4L2_CID_HFLIP:
 278                 err = ov7660_set_hvflip(gspca_dev);
 279                 break;
 280         default:
 281                 return -EINVAL;
 282         }
 283
 284         return err;
 285 }
 286
 287 static void ov7660_dump_registers(struct sd *sd)
 288 {
 289         int address;
 290         pr_info("Dumping the ov7660 register state\n");
 291         for (address = 0; address < 0xa9; address++) {
 292                 u8 value;
 293                 m5602_read_sensor(sd, address, &value, 1);
 294                 pr_info("register 0x%x contains 0x%x\n", address, value);
 295         }
 296
 297         pr_info("ov7660 register state dump complete\n");
 298
 299         pr_info("Probing for which registers that are read/write\n");
 300         for (address = 0; address < 0xff; address++) {
 301                 u8 old_value, ctrl_value;
 302                 u8 test_value[2] = {0xff, 0xff};
 303
 304                 m5602_read_sensor(sd, address, &old_value, 1);
 305                 m5602_write_sensor(sd, address, test_value, 1);
 306                 m5602_read_sensor(sd, address, &ctrl_value, 1);
 307
 308                 if (ctrl_value == test_value[0])
 309                         pr_info("register 0x%x is writeable\n", address);
 310                 else
 311                         pr_info("register 0x%x is read only\n", address);
 312
 313                 /* Restore original value */
 314                 m5602_write_sensor(sd, address, &old_value, 1);
 315         }
 316 }