sn9c20x.c

   1 /**
   2  * @file sn9c20x.c
   3  * @author Dave Neuer
   4  * @date 2008-03-02
   5  * @version v0.0.0
   6  *
   7  * @brief Common functions and data for the Sonix SN9C20x webcam bridge chips.
   8  *
   9  * @note Copyright (C) Dave Neuer
  10  *
  11  * @par Licences
  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  * 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  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  */
  27
  28 #include <linux/delay.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include "microdia.h"
  32 #include "sn9c20x.h"
  33
  34
  35 int sn9c20x_i2c_ack_wait(struct usb_microdia *, bool, bool *);
  36
  37
  38 /**
  39  * @brief Initializes IC2-registers 0x10c0-0x10c7
  40  *
  41  * @param dev Pointer to the device
  42  * @param flags The appropriate flags for bus speed and physical connection
  43  * @param slave The id of the I2C slave device
  44  *
  45  * @return Zero (success) or negative (USB-error value)
  46  *
  47  */
  48 int sn9c20x_initialize_i2c(struct usb_microdia * dev, __u8 flags, __u8 slave)
  49 {
  50         __u8 buf[8];
  51         int ret;
  52
  53         buf[0] = 0x81 & flags;
  54         buf[1] = slave;
  55         buf[2] = 0x00;
  56         buf[3] = 0x00;
  57         buf[4] = 0x00;
  58         buf[5] = 0x00;
  59         buf[6] = 0x00;
  60         buf[7] = 0x00;
  61         ret = usb_microdia_control_write(dev, 0x10c0, buf, 8);
  62         if (ret < 0)
  63                 return ret;
  64         else
  65                 return 0;
  66 }
  67
  68 /**
  69  * @brief Read up to 5 bytes of data from an I2C slave
  70  *
  71  * @param dev Pointer to the device
  72  * @param slave The id of the I2C slave device
  73  * @param nbytes Number of bytes to read
  74  * @param address The address of the register on the slave to read
  75  * @param flags The appropriate flags for bus speed and physical connection
  76  * @param result A pointer to the location at which the result should be stored
  77  *
  78  * @return Zero for success or a negative error value
  79  *
  80  */
  81 int sn9c20x_read_i2c_data(struct usb_microdia * dev, __u8 slave, __u8 nbytes, __u8 address,
  82         __u8 flags, __u8 * result)
  83 {
  84         int ret, i, j;
  85         __u8 row[5];
  86
  87         if(!dev || nbytes > 4)
  88                 return -EINVAL;
  89
  90         /* first, we must do a dummy write of just the address */
  91         ret = sn9c20x_write_i2c_data(dev, slave, 0, address, flags, NULL);
  92         if(ret < 0)
  93                 return ret;
  94
  95         memset(row, 0, 5);
  96         /* now we issue the same command but with the read bit set
  97          * and no slave register address */
  98         ret = sn9c20x_write_i2c_data(dev, slave, nbytes - 1, 0, flags |
  99                 SN9C20X_I2C_READ, row);
 100         if(ret < 0)
 101                 return ret;
 102
 103         /* finally, ask the bridge for the data */
 104         ret = usb_microdia_control_read(dev, 0x10c2, row, 5);
 105         if(ret < 0)
 106                 return ret;
 107
 108         for(i = 0, j = 5 - nbytes; i < nbytes; i++, j++)
 109                 result[i] = row[j];
 110
 111         return 0;
 112 }
 113
 114 /**
 115  * @brief Read up to 4 bytes of data from an I2C slave an return them as 16bit values
 116  *
 117  * @param dev Pointer to the device
 118  * @param slave The id of the I2C slave device
 119  * @param datalen Number of 16bit values to read
 120  * @param address The address of the register on the slave to read
 121  * @param flags The appropriate flags for bus speed and physical connection
 122  * @param result A pointer to the location at which the result should be stored
 123  *
 124  * @return Zero for success or a negative error value
 125  *
 126  */
 127 int sn9c20x_read_i2c_data16(struct usb_microdia * dev, __u8 slave, __u8 datalen, __u8 address,
 128         __u8 flags, __u16 * result)
 129 {
 130         __u8 result8[4];
 131         __u8 k;
 132         int ret;
 133
 134         if(datalen > 2) return -EINVAL;
 135         ret = sn9c20x_read_i2c_data(dev, slave, 2*datalen, address, flags, result8);
 136         for (k=0; k<datalen; k++)
 137                 result[k] = (result8[k*2] << 8) | result8[k*2+1];
 138         return ret;
 139 }
 140
 141 static const char *wasread = "read from";
 142 static const char *waswrite = "write to";
 143
 144 /**
 145  * @brief Write up to 5 bytes of data to an I2C slave
 146  *
 147  * @param dev Pointer to the device
 148  * @param slave The id of the I2C slave device
 149  * @param nbytes The number of bytes of data
 150  * @param address The address of the register on the slave to write
 151  * @param flags The appropriate flags for bus speed and physical connection
 152  * @param data An array containing the data to write
 153  *
 154  * @return Zero for success or a negative error value
 155  *
 156  */
 157 int sn9c20x_write_i2c_data(struct usb_microdia * dev, __u8 slave, __u8 nbytes,
 158         __u8 address, __u8 flags, const __u8 data[nbytes])
 159 {
 160         int ret, i;
 161         __u8 row[8];
 162         bool slave_error = 0;
 163
 164         if(!dev || (nbytes > 0 && !data) || nbytes > 4)
 165                 return -EINVAL;
 166
 167         /* from the point of view of the bridge, the length
 168          * includes the address */
 169         row[0] = flags | ((nbytes + 1) << 4);
 170         row[1] = slave;
 171         row[2] = address;
 172         row[7] = 0x10; /* I think this means we want an ack */
 173
 174         for(i = 0; i < 4; i++)
 175                 row[i + 3] = i < nbytes ? data[i] : 0;
 176
 177         UDIA_DEBUG("I2C %s %02x: %02x %02x %02x %02x %02x %02x %02x %02x\n",
 178                 (flags & SN9C20X_I2C_READ ? wasread : waswrite), address,
 179                 row[0], row[1], row[2], row[3], row[4], row[5], row[6], row[7]);
 180
 181         ret = usb_microdia_control_write(dev, 0x10c0, row, 8);
 182         if(ret >= 0)
 183                 ret = sn9c20x_i2c_ack_wait(dev, flags & SN9C20X_I2C_400KHZ,
 184                         &slave_error);
 185
 186         if(slave_error) {
 187                 UDIA_ERROR("I2C slave 0x%02x returned error during %s address 0x%02x\n",
 188                         slave,
 189                         (flags & SN9C20X_I2C_READ ? wasread : waswrite),
 190                         address);
 191                 return -1000;   // there should be no interference with USB errors
 192         }
 193
 194         if(ret < 0) {
 195                 /* we got no ack */
 196                 UDIA_ERROR("No ack from I2C slave 0x%02x for %s address 0x%02x\n",
 197                         slave,
 198                         (flags & SN9C20X_I2C_READ ? wasread : waswrite),
 199                         address);
 200                 return ret;
 201         }
 202
 203         return 0;
 204 }
 205
 206 /**
 207  * @brief Write up to 2 16bit values als single bytes to an I2C slave
 208  *
 209  * @param dev Pointer to the device
 210  * @param slave The id of the I2C slave device
 211  * @param datalen The number of 16bit data values to write
 212  * @param address The address of the register on the slave to write
 213  * @param flags The appropriate flags for bus speed and physical connection
 214  * @param data An array containing the data to write
 215  *
 216  * @return Zero for success or a negative error value
 217  *
 218  */
 219 int sn9c20x_write_i2c_data16(struct usb_microdia * dev, __u8 slave, __u8 datalen,
 220         __u8 address, __u8 flags, const __u16 data[datalen])
 221 {
 222         __u8 data8[4];
 223         __u8 k;
 224         int ret;
 225
 226         if(datalen > 2) return -EINVAL;
 227         for (k=0; k<datalen; k++)
 228         {
 229                 data8[k*2] = data[k] >> 8;
 230                 data8[k*2+1] = data[k] & 0xff;
 231         }
 232         ret = sn9c20x_write_i2c_data(dev, slave, 2*datalen, address, flags, data8);
 233         return ret;
 234 }
 235
 236 /**
 237  * @brief Wait until the I2C slave is ready for the next operation
 238  *
 239  * @param dev Pointer to the device
 240  * @param highspeed
 241  * @param slave_error
 242  *
 243  * @return Zero for success or a negative error value
 244  *
 245  */
 246 int sn9c20x_i2c_ack_wait(struct usb_microdia *dev, bool highspeed, bool * slave_error)
 247 {
 248         int ret, i;
 249         __u8 readbuf;
 250         int delay = highspeed ? 100 : 400;
 251
 252         for(i = 0; i< 5; i++) {
 253                 ret = usb_microdia_control_read(dev, 0x10c0, &readbuf, 1);
 254
 255                 if(ret < 0)
 256                         return ret;
 257                 else if(readbuf & SN9C20X_I2C_ERROR) {
 258                         *slave_error = 1;
 259                         /* probably should come up w/ an error value and
 260                          * return it via the error return */
 261                         return 0;
 262                 }
 263                 else if(readbuf & SN9C20X_I2C_READY)
 264                         return 0;
 265                 else
 266                         udelay(delay);
 267         }
 268
 269         return -EBUSY;
 270 }
 271
 272
 273 int sn9c20x_set_contrast(struct usb_microdia *dev)
 274 {
 275         /* from 0x26 to 0x4b */
 276         __u8 brightness_contrast[21] = {0x16, 0x0, 0x2b, 0x0, 0x8, 0x0, 0xf6, 0x0f,
 277                                 0xd2, 0x0f, 0x38, 0x0, 0x34, 0x0, 0xcf, 0x0f,
 278                                 0xfd, 0x0f, 0x0, 0x0, 0x0};
 279         __u8 contrast_val = (dev->vsettings.contrast >> 8) * 0x25 / 0x100;
 280         __u8 brightness_val = dev->vsettings.brightness >> 8;
 281
 282         brightness_val -= 0x80;
 283         brightness_contrast[18] = brightness_val;
 284
 285         contrast_val += 0x26;
 286         brightness_contrast[2] = contrast_val;
 287         brightness_contrast[0] = 0x13 + (brightness_contrast[2] - 0x26) * 0x13 / 0x25;
 288         brightness_contrast[4] = 0x7 + (brightness_contrast[2] - 0x26) * 0x7 / 0x25;
 289
 290         return usb_microdia_control_write(dev, 0x10e1, brightness_contrast, 21);
 291 }
 292
 293 int sn9c20x_set_brightness(struct usb_microdia *dev)
 294 {
 295         return dev_microdia_camera_set_contrast(dev);
 296 }
 297
 298 int sn9c20x_set_gamma(struct usb_microdia *dev)
 299 {
 300         int value = (dev->vsettings.whiteness >> 8) * 0xb8 / 0x100;
 301         int r = 0;
 302
 303         __u8 gamma_val[17] = {0x0a, 0x13, 0x25, 0x37, 0x45, 0x55, 0x65, 0x74,
 304                         0x83, 0x92, 0xa1, 0xb0, 0xbf, 0xce, 0xdf, 0xea, 0xf5};
 305
 306         gamma_val[0] = 0x0a;
 307         gamma_val[1] = 0x13 + (value * (0xcb - 0x13) / 0xb8);
 308         gamma_val[2] = 0x25 + (value * (0xee - 0x25) / 0xb8);
 309         gamma_val[3] = 0x37 + (value * (0xfa - 0x37) / 0xb8);
 310         gamma_val[4] = 0x45 + (value * (0xfc - 0x45) / 0xb8);
 311         gamma_val[5] = 0x55 + (value * (0xfb - 0x55) / 0xb8);
 312         gamma_val[6] = 0x65 + (value * (0xfc - 0x65) / 0xb8);
 313         gamma_val[7] = 0x74 + (value * (0xfd - 0x74) / 0xb8);
 314         gamma_val[8] = 0x83 + (value * (0xfe - 0x83) / 0xb8);
 315         gamma_val[9] = 0x92 + (value * (0xfc - 0x92) / 0xb8);
 316         gamma_val[10] = 0xa1 + (value * (0xfc - 0xa1) / 0xb8);
 317         gamma_val[11] = 0xb0 + (value * (0xfc - 0xb0) / 0xb8);
 318         gamma_val[12] = 0xbf + (value * (0xfb - 0xbf) / 0xb8);
 319         gamma_val[13] = 0xce + (value * (0xfb - 0xce) / 0xb8);
 320         gamma_val[14] = 0xdf + (value * (0xfd - 0xdf) / 0xb8);
 321         gamma_val[15] = 0xea + (value * (0xf9 - 0xea) / 0xb8);
 322         gamma_val[16] = 0xf5;
 323
 324         r = usb_microdia_control_write(dev, 0x1190, gamma_val, 17);
 325
 326         return r;
 327 }
 328
 329 int sn9c20x_set_sharpness(struct usb_microdia *dev)
 330 {
 331         __u8 val[1];
 332         int ret;
 333
 334         ret = usb_microdia_control_read(dev, 0x10f6, val, 1);
 335         if (ret < 0)
 336                 return ret;
 337         val[0] = (val[0] & 0xc0) | (dev->vsettings.sharpness & 0x3f);
 338         ret = usb_microdia_control_write(dev, 0x10f6, val, 1);
 339         if (ret < 0)
 340                 return ret;
 341         else
 342                 return 0;
 343 }
 344