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 <linux/slab.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-chip-ident.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,
 106                               u32 input, u32 output, u32 config)
 107 {
 108         struct upd64083_state *state = to_state(sd);
 109         u8 r00, r02;
 110
 111         if (input > 7 || (input & 6) == 6)
 112                 return -EINVAL;
 113         state->mode = (input & 3) << 6;
 114         state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
 115         r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
 116         r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
 117         upd64083_write(sd, R00, r00);
 118         upd64083_write(sd, R02, r02);
 119         return 0;
 120 }
 121
 122 #ifdef CONFIG_VIDEO_ADV_DEBUG
 123 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 124 {
 125         struct i2c_client *client = v4l2_get_subdevdata(sd);
 126
 127         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 128                 return -EINVAL;
 129         if (!capable(CAP_SYS_ADMIN))
 130                 return -EPERM;
 131         reg->val = upd64083_read(sd, reg->reg & 0xff);
 132         reg->size = 1;
 133         return 0;
 134 }
 135
 136 static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 137 {
 138         struct i2c_client *client = v4l2_get_subdevdata(sd);
 139
 140         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 141                 return -EINVAL;
 142         if (!capable(CAP_SYS_ADMIN))
 143                 return -EPERM;
 144         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 145         return 0;
 146 }
 147 #endif
 148
 149 static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 150 {
 151         struct i2c_client *client = v4l2_get_subdevdata(sd);
 152
 153         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
 154 }
 155
 156 static int upd64083_log_status(struct v4l2_subdev *sd)
 157 {
 158         struct i2c_client *client = v4l2_get_subdevdata(sd);
 159         u8 buf[7];
 160
 161         i2c_master_recv(client, buf, 7);
 162         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 163                       "SA04=%02x SA05=%02x SA06=%02x\n",
 164                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 165         return 0;
 166 }
 167
 168 /* ----------------------------------------------------------------------- */
 169
 170 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 171         .log_status = upd64083_log_status,
 172         .g_chip_ident = upd64083_g_chip_ident,
 173 #ifdef CONFIG_VIDEO_ADV_DEBUG
 174         .g_register = upd64083_g_register,
 175         .s_register = upd64083_s_register,
 176 #endif
 177 };
 178
 179 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 180         .s_routing = upd64083_s_routing,
 181 };
 182
 183 static const struct v4l2_subdev_ops upd64083_ops = {
 184         .core = &upd64083_core_ops,
 185         .video = &upd64083_video_ops,
 186 };
 187
 188 /* ------------------------------------------------------------------------ */
 189
 190 /* i2c implementation */
 191
 192 static int upd64083_probe(struct i2c_client *client,
 193                           const struct i2c_device_id *id)
 194 {
 195         struct upd64083_state *state;
 196         struct v4l2_subdev *sd;
 197         int i;
 198
 199         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 200                 return -EIO;
 201
 202         v4l_info(client, "chip found @ 0x%x (%s)\n",
 203                         client->addr << 1, client->adapter->name);
 204
 205         state = kzalloc(sizeof(struct upd64083_state), GFP_KERNEL);
 206         if (state == NULL)
 207                 return -ENOMEM;
 208         sd = &state->sd;
 209         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 210         /* Initially assume that a ghost reduction chip is present */
 211         state->mode = 0;  /* YCS mode */
 212         state->ext_y_adc = (1 << 5);
 213         memcpy(state->regs, upd64083_init, TOT_REGS);
 214         for (i = 0; i < TOT_REGS; i++)
 215                 upd64083_write(sd, i, state->regs[i]);
 216         return 0;
 217 }
 218
 219 static int upd64083_remove(struct i2c_client *client)
 220 {
 221         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 222
 223         v4l2_device_unregister_subdev(sd);
 224         kfree(to_state(sd));
 225         return 0;
 226 }
 227
 228 /* ----------------------------------------------------------------------- */
 229
 230 static const struct i2c_device_id upd64083_id[] = {
 231         { "upd64083", 0 },
 232         { }
 233 };
 234 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 235
 236 static struct i2c_driver upd64083_driver = {
 237         .driver = {
 238                 .owner  = THIS_MODULE,
 239                 .name   = "upd64083",
 240         },
 241         .probe          = upd64083_probe,
 242         .remove         = upd64083_remove,
 243         .id_table       = upd64083_id,
 244 };
 245
 246 static __init int init_upd64083(void)
 247 {
 248         return i2c_add_driver(&upd64083_driver);
 249 }
 250
 251 static __exit void exit_upd64083(void)
 252 {
 253         i2c_del_driver(&upd64083_driver);
 254 }
 255
 256 module_init(init_upd64083);
 257 module_exit(exit_upd64083);