drivers/media/video/upd64083.c

   1 /*
   2  * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
   3  *
   4  * 2003 by T.Adachi (tadachi@tadachi-net.com)
   5  * 2003 by Takeru KOMORIYA <komoriya@paken.org>
   6  * 2006 by Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/i2c.h>
  27 #include <linux/videodev2.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-chip-ident.h>
  30 #include <media/v4l2-i2c-drv.h>
  31 #include <media/upd64083.h>
  32
  33 MODULE_DESCRIPTION("uPD64083 driver");
  34 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  35 MODULE_LICENSE("GPL");
  36
  37 static int debug;
  38 module_param(debug, bool, 0644);
  39
  40 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  41
  42
  43 enum {
  44         R00 = 0, R01, R02, R03, R04,
  45         R05, R06, R07, R08, R09,
  46         R0A, R0B, R0C, R0D, R0E, R0F,
  47         R10, R11, R12, R13, R14,
  48         R15, R16,
  49         TOT_REGS
  50 };
  51
  52 struct upd64083_state {
  53         struct v4l2_subdev sd;
  54         u8 mode;
  55         u8 ext_y_adc;
  56         u8 regs[TOT_REGS];
  57 };
  58
  59 static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  60 {
  61         return container_of(sd, struct upd64083_state, sd);
  62 }
  63
  64 /* Initial values when used in combination with the
  65    NEC upd64031a ghost reduction chip. */
  66 static u8 upd64083_init[] = {
  67         0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  68         0x36, 0xdd, 0x05, 0x56, 0x48,
  69         0x00, 0x3a, 0xa0, 0x05, 0x08,
  70         0x44, 0x60, 0x08, 0x52, 0xf8,
  71         0x53, 0x60, 0x10
  72 };
  73
  74 /* ------------------------------------------------------------------------ */
  75
  76 static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  77 {
  78         struct i2c_client *client = v4l2_get_subdevdata(sd);
  79         u8 buf[2];
  80
  81         buf[0] = reg;
  82         buf[1] = val;
  83         v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
  84         if (i2c_master_send(client, buf, 2) != 2)
  85                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
  86 }
  87
  88 /* ------------------------------------------------------------------------ */
  89
  90 #ifdef CONFIG_VIDEO_ADV_DEBUG
  91 static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
  92 {
  93         struct i2c_client *client = v4l2_get_subdevdata(sd);
  94         u8 buf[7];
  95
  96         if (reg >= sizeof(buf))
  97                 return 0xff;
  98         i2c_master_recv(client, buf, sizeof(buf));
  99         return buf[reg];
 100 }
 101 #endif
 102
 103 /* ------------------------------------------------------------------------ */
 104
 105 static int upd64083_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
 106 {
 107         struct upd64083_state *state = to_state(sd);
 108         u8 r00, r02;
 109
 110         if (route->input > 7 || (route->input & 6) == 6)
 111                 return -EINVAL;
 112         state->mode = (route->input & 3) << 6;
 113         state->ext_y_adc = (route->input & UPD64083_EXT_Y_ADC) << 3;
 114         r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
 115         r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
 116         upd64083_write(sd, R00, r00);
 117         upd64083_write(sd, R02, r02);
 118         return 0;
 119 }
 120
 121 #ifdef CONFIG_VIDEO_ADV_DEBUG
 122 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 123 {
 124         struct i2c_client *client = v4l2_get_subdevdata(sd);
 125
 126         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 127                 return -EINVAL;
 128         if (!capable(CAP_SYS_ADMIN))
 129                 return -EPERM;
 130         reg->val = upd64083_read(sd, reg->reg & 0xff);
 131         reg->size = 1;
 132         return 0;
 133 }
 134
 135 static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 136 {
 137         struct i2c_client *client = v4l2_get_subdevdata(sd);
 138
 139         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 140                 return -EINVAL;
 141         if (!capable(CAP_SYS_ADMIN))
 142                 return -EPERM;
 143         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 144         return 0;
 145 }
 146 #endif
 147
 148 static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 149 {
 150         struct i2c_client *client = v4l2_get_subdevdata(sd);
 151
 152         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
 153 }
 154
 155 static int upd64083_log_status(struct v4l2_subdev *sd)
 156 {
 157         struct i2c_client *client = v4l2_get_subdevdata(sd);
 158         u8 buf[7];
 159
 160         i2c_master_recv(client, buf, 7);
 161         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 162                       "SA04=%02x SA05=%02x SA06=%02x\n",
 163                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 164         return 0;
 165 }
 166
 167 static int upd64083_command(struct i2c_client *client, unsigned cmd, void *arg)
 168 {
 169         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
 170 }
 171
 172 /* ----------------------------------------------------------------------- */
 173
 174 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 175         .log_status = upd64083_log_status,
 176         .g_chip_ident = upd64083_g_chip_ident,
 177 #ifdef CONFIG_VIDEO_ADV_DEBUG
 178         .g_register = upd64083_g_register,
 179         .s_register = upd64083_s_register,
 180 #endif
 181 };
 182
 183 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 184         .s_routing = upd64083_s_routing,
 185 };
 186
 187 static const struct v4l2_subdev_ops upd64083_ops = {
 188         .core = &upd64083_core_ops,
 189         .video = &upd64083_video_ops,
 190 };
 191
 192 /* ------------------------------------------------------------------------ */
 193
 194 /* i2c implementation */
 195
 196 static int upd64083_probe(struct i2c_client *client,
 197                           const struct i2c_device_id *id)
 198 {
 199         struct upd64083_state *state;
 200         struct v4l2_subdev *sd;
 201         int i;
 202
 203         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 204                 return -EIO;
 205
 206         v4l_info(client, "chip found @ 0x%x (%s)\n",
 207                         client->addr << 1, client->adapter->name);
 208
 209         state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);
 210         if (state == NULL)
 211                 return -ENOMEM;
 212         sd = &state->sd;
 213         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 214         /* Initially assume that a ghost reduction chip is present */
 215         state->mode = 0;  /* YCS mode */
 216         state->ext_y_adc = (1 << 5);
 217         memcpy(state->regs, upd64083_init, TOT_REGS);
 218         for (i = 0; i < TOT_REGS; i++)
 219                 upd64083_write(sd, i, state->regs[i]);
 220         return 0;
 221 }
 222
 223 static int upd64083_remove(struct i2c_client *client)
 224 {
 225         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 226
 227         v4l2_device_unregister_subdev(sd);
 228         kfree(to_state(sd));
 229         return 0;
 230 }
 231
 232 /* ----------------------------------------------------------------------- */
 233
 234 static const struct i2c_device_id upd64083_id[] = {
 235         { "upd64083", 0 },
 236         { }
 237 };
 238 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 239
 240 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 241         .name = "upd64083",
 242         .driverid = I2C_DRIVERID_UPD64083,
 243         .command = upd64083_command,
 244         .probe = upd64083_probe,
 245         .remove = upd64083_remove,
 246         .id_table = upd64083_id,
 247 };