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/v4l2-i2c-drv.h>
  32 #include <media/upd64083.h>
  33
  34 MODULE_DESCRIPTION("uPD64083 driver");
  35 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  36 MODULE_LICENSE("GPL");
  37
  38 static int debug;
  39 module_param(debug, bool, 0644);
  40
  41 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  42
  43
  44 enum {
  45         R00 = 0, R01, R02, R03, R04,
  46         R05, R06, R07, R08, R09,
  47         R0A, R0B, R0C, R0D, R0E, R0F,
  48         R10, R11, R12, R13, R14,
  49         R15, R16,
  50         TOT_REGS
  51 };
  52
  53 struct upd64083_state {
  54         struct v4l2_subdev sd;
  55         u8 mode;
  56         u8 ext_y_adc;
  57         u8 regs[TOT_REGS];
  58 };
  59
  60 static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  61 {
  62         return container_of(sd, struct upd64083_state, sd);
  63 }
  64
  65 /* Initial values when used in combination with the
  66    NEC upd64031a ghost reduction chip. */
  67 static u8 upd64083_init[] = {
  68         0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  69         0x36, 0xdd, 0x05, 0x56, 0x48,
  70         0x00, 0x3a, 0xa0, 0x05, 0x08,
  71         0x44, 0x60, 0x08, 0x52, 0xf8,
  72         0x53, 0x60, 0x10
  73 };
  74
  75 /* ------------------------------------------------------------------------ */
  76
  77 static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  78 {
  79         struct i2c_client *client = v4l2_get_subdevdata(sd);
  80         u8 buf[2];
  81
  82         buf[0] = reg;
  83         buf[1] = val;
  84         v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
  85         if (i2c_master_send(client, buf, 2) != 2)
  86                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
  87 }
  88
  89 /* ------------------------------------------------------------------------ */
  90
  91 #ifdef CONFIG_VIDEO_ADV_DEBUG
  92 static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
  93 {
  94         struct i2c_client *client = v4l2_get_subdevdata(sd);
  95         u8 buf[7];
  96
  97         if (reg >= sizeof(buf))
  98                 return 0xff;
  99         i2c_master_recv(client, buf, sizeof(buf));
 100         return buf[reg];
 101 }
 102 #endif
 103
 104 /* ------------------------------------------------------------------------ */
 105
 106 static int upd64083_s_routing(struct v4l2_subdev *sd,
 107                               u32 input, u32 output, u32 config)
 108 {
 109         struct upd64083_state *state = to_state(sd);
 110         u8 r00, r02;
 111
 112         if (input > 7 || (input & 6) == 6)
 113                 return -EINVAL;
 114         state->mode = (input & 3) << 6;
 115         state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
 116         r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
 117         r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
 118         upd64083_write(sd, R00, r00);
 119         upd64083_write(sd, R02, r02);
 120         return 0;
 121 }
 122
 123 #ifdef CONFIG_VIDEO_ADV_DEBUG
 124 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 125 {
 126         struct i2c_client *client = v4l2_get_subdevdata(sd);
 127
 128         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 129                 return -EINVAL;
 130         if (!capable(CAP_SYS_ADMIN))
 131                 return -EPERM;
 132         reg->val = upd64083_read(sd, reg->reg & 0xff);
 133         reg->size = 1;
 134         return 0;
 135 }
 136
 137 static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 138 {
 139         struct i2c_client *client = v4l2_get_subdevdata(sd);
 140
 141         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 142                 return -EINVAL;
 143         if (!capable(CAP_SYS_ADMIN))
 144                 return -EPERM;
 145         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 146         return 0;
 147 }
 148 #endif
 149
 150 static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 151 {
 152         struct i2c_client *client = v4l2_get_subdevdata(sd);
 153
 154         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
 155 }
 156
 157 static int upd64083_log_status(struct v4l2_subdev *sd)
 158 {
 159         struct i2c_client *client = v4l2_get_subdevdata(sd);
 160         u8 buf[7];
 161
 162         i2c_master_recv(client, buf, 7);
 163         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 164                       "SA04=%02x SA05=%02x SA06=%02x\n",
 165                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 166         return 0;
 167 }
 168
 169 /* ----------------------------------------------------------------------- */
 170
 171 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 172         .log_status = upd64083_log_status,
 173         .g_chip_ident = upd64083_g_chip_ident,
 174 #ifdef CONFIG_VIDEO_ADV_DEBUG
 175         .g_register = upd64083_g_register,
 176         .s_register = upd64083_s_register,
 177 #endif
 178 };
 179
 180 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 181         .s_routing = upd64083_s_routing,
 182 };
 183
 184 static const struct v4l2_subdev_ops upd64083_ops = {
 185         .core = &upd64083_core_ops,
 186         .video = &upd64083_video_ops,
 187 };
 188
 189 /* ------------------------------------------------------------------------ */
 190
 191 /* i2c implementation */
 192
 193 static int upd64083_probe(struct i2c_client *client,
 194                           const struct i2c_device_id *id)
 195 {
 196         struct upd64083_state *state;
 197         struct v4l2_subdev *sd;
 198         int i;
 199
 200         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 201                 return -EIO;
 202
 203         v4l_info(client, "chip found @ 0x%x (%s)\n",
 204                         client->addr << 1, client->adapter->name);
 205
 206         state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);
 207         if (state == NULL)
 208                 return -ENOMEM;
 209         sd = &state->sd;
 210         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 211         /* Initially assume that a ghost reduction chip is present */
 212         state->mode = 0;  /* YCS mode */
 213         state->ext_y_adc = (1 << 5);
 214         memcpy(state->regs, upd64083_init, TOT_REGS);
 215         for (i = 0; i < TOT_REGS; i++)
 216                 upd64083_write(sd, i, state->regs[i]);
 217         return 0;
 218 }
 219
 220 static int upd64083_remove(struct i2c_client *client)
 221 {
 222         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 223
 224         v4l2_device_unregister_subdev(sd);
 225         kfree(to_state(sd));
 226         return 0;
 227 }
 228
 229 /* ----------------------------------------------------------------------- */
 230
 231 static const struct i2c_device_id upd64083_id[] = {
 232         { "upd64083", 0 },
 233         { }
 234 };
 235 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 236
 237 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 238         .name = "upd64083",
 239         .probe = upd64083_probe,
 240         .remove = upd64083_remove,
 241         .id_table = upd64083_id,
 242 };