drivers/media/i2c/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/upd64083.h>
  31
  32 MODULE_DESCRIPTION("uPD64083 driver");
  33 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  34 MODULE_LICENSE("GPL");
  35
  36 static bool debug;
  37 module_param(debug, bool, 0644);
  38
  39 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  40
  41
  42 enum {
  43         R00 = 0, R01, R02, R03, R04,
  44         R05, R06, R07, R08, R09,
  45         R0A, R0B, R0C, R0D, R0E, R0F,
  46         R10, R11, R12, R13, R14,
  47         R15, R16,
  48         TOT_REGS
  49 };
  50
  51 struct upd64083_state {
  52         struct v4l2_subdev sd;
  53         u8 mode;
  54         u8 ext_y_adc;
  55         u8 regs[TOT_REGS];
  56 };
  57
  58 static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  59 {
  60         return container_of(sd, struct upd64083_state, sd);
  61 }
  62
  63 /* Initial values when used in combination with the
  64    NEC upd64031a ghost reduction chip. */
  65 static u8 upd64083_init[] = {
  66         0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  67         0x36, 0xdd, 0x05, 0x56, 0x48,
  68         0x00, 0x3a, 0xa0, 0x05, 0x08,
  69         0x44, 0x60, 0x08, 0x52, 0xf8,
  70         0x53, 0x60, 0x10
  71 };
  72
  73 /* ------------------------------------------------------------------------ */
  74
  75 static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  76 {
  77         struct i2c_client *client = v4l2_get_subdevdata(sd);
  78         u8 buf[2];
  79
  80         buf[0] = reg;
  81         buf[1] = val;
  82         v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
  83         if (i2c_master_send(client, buf, 2) != 2)
  84                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
  85 }
  86
  87 /* ------------------------------------------------------------------------ */
  88
  89 #ifdef CONFIG_VIDEO_ADV_DEBUG
  90 static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
  91 {
  92         struct i2c_client *client = v4l2_get_subdevdata(sd);
  93         u8 buf[7];
  94
  95         if (reg >= sizeof(buf))
  96                 return 0xff;
  97         i2c_master_recv(client, buf, sizeof(buf));
  98         return buf[reg];
  99 }
 100 #endif
 101
 102 /* ------------------------------------------------------------------------ */
 103
 104 static int upd64083_s_routing(struct v4l2_subdev *sd,
 105                               u32 input, u32 output, u32 config)
 106 {
 107         struct upd64083_state *state = to_state(sd);
 108         u8 r00, r02;
 109
 110         if (input > 7 || (input & 6) == 6)
 111                 return -EINVAL;
 112         state->mode = (input & 3) << 6;
 113         state->ext_y_adc = (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         reg->val = upd64083_read(sd, reg->reg & 0xff);
 125         reg->size = 1;
 126         return 0;
 127 }
 128
 129 static int upd64083_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 130 {
 131         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 132         return 0;
 133 }
 134 #endif
 135
 136 static int upd64083_log_status(struct v4l2_subdev *sd)
 137 {
 138         struct i2c_client *client = v4l2_get_subdevdata(sd);
 139         u8 buf[7];
 140
 141         i2c_master_recv(client, buf, 7);
 142         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 143                       "SA04=%02x SA05=%02x SA06=%02x\n",
 144                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 145         return 0;
 146 }
 147
 148 /* ----------------------------------------------------------------------- */
 149
 150 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 151         .log_status = upd64083_log_status,
 152 #ifdef CONFIG_VIDEO_ADV_DEBUG
 153         .g_register = upd64083_g_register,
 154         .s_register = upd64083_s_register,
 155 #endif
 156 };
 157
 158 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 159         .s_routing = upd64083_s_routing,
 160 };
 161
 162 static const struct v4l2_subdev_ops upd64083_ops = {
 163         .core = &upd64083_core_ops,
 164         .video = &upd64083_video_ops,
 165 };
 166
 167 /* ------------------------------------------------------------------------ */
 168
 169 /* i2c implementation */
 170
 171 static int upd64083_probe(struct i2c_client *client,
 172                           const struct i2c_device_id *id)
 173 {
 174         struct upd64083_state *state;
 175         struct v4l2_subdev *sd;
 176         int i;
 177
 178         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 179                 return -EIO;
 180
 181         v4l_info(client, "chip found @ 0x%x (%s)\n",
 182                         client->addr << 1, client->adapter->name);
 183
 184         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 185         if (state == NULL)
 186                 return -ENOMEM;
 187         sd = &state->sd;
 188         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 189         /* Initially assume that a ghost reduction chip is present */
 190         state->mode = 0;  /* YCS mode */
 191         state->ext_y_adc = (1 << 5);
 192         memcpy(state->regs, upd64083_init, TOT_REGS);
 193         for (i = 0; i < TOT_REGS; i++)
 194                 upd64083_write(sd, i, state->regs[i]);
 195         return 0;
 196 }
 197
 198 static int upd64083_remove(struct i2c_client *client)
 199 {
 200         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 201
 202         v4l2_device_unregister_subdev(sd);
 203         return 0;
 204 }
 205
 206 /* ----------------------------------------------------------------------- */
 207
 208 static const struct i2c_device_id upd64083_id[] = {
 209         { "upd64083", 0 },
 210         { }
 211 };
 212 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 213
 214 static struct i2c_driver upd64083_driver = {
 215         .driver = {
 216                 .owner  = THIS_MODULE,
 217                 .name   = "upd64083",
 218         },
 219         .probe          = upd64083_probe,
 220         .remove         = upd64083_remove,
 221         .id_table       = upd64083_id,
 222 };
 223
 224 module_i2c_driver(upd64083_driver);