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
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/i2c.h>
  22 #include <linux/videodev2.h>
  23 #include <linux/slab.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/i2c/upd64083.h>
  26
  27 MODULE_DESCRIPTION("uPD64083 driver");
  28 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  29 MODULE_LICENSE("GPL");
  30
  31 static bool debug;
  32 module_param(debug, bool, 0644);
  33
  34 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  35
  36
  37 enum {
  38         R00 = 0, R01, R02, R03, R04,
  39         R05, R06, R07, R08, R09,
  40         R0A, R0B, R0C, R0D, R0E, R0F,
  41         R10, R11, R12, R13, R14,
  42         R15, R16,
  43         TOT_REGS
  44 };
  45
  46 struct upd64083_state {
  47         struct v4l2_subdev sd;
  48         u8 mode;
  49         u8 ext_y_adc;
  50         u8 regs[TOT_REGS];
  51 };
  52
  53 static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  54 {
  55         return container_of(sd, struct upd64083_state, sd);
  56 }
  57
  58 /* Initial values when used in combination with the
  59    NEC upd64031a ghost reduction chip. */
  60 static u8 upd64083_init[] = {
  61         0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  62         0x36, 0xdd, 0x05, 0x56, 0x48,
  63         0x00, 0x3a, 0xa0, 0x05, 0x08,
  64         0x44, 0x60, 0x08, 0x52, 0xf8,
  65         0x53, 0x60, 0x10
  66 };
  67
  68 /* ------------------------------------------------------------------------ */
  69
  70 static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  71 {
  72         struct i2c_client *client = v4l2_get_subdevdata(sd);
  73         u8 buf[2];
  74
  75         buf[0] = reg;
  76         buf[1] = val;
  77         v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
  78         if (i2c_master_send(client, buf, 2) != 2)
  79                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
  80 }
  81
  82 /* ------------------------------------------------------------------------ */
  83
  84 #ifdef CONFIG_VIDEO_ADV_DEBUG
  85 static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
  86 {
  87         struct i2c_client *client = v4l2_get_subdevdata(sd);
  88         u8 buf[7];
  89
  90         if (reg >= sizeof(buf))
  91                 return 0xff;
  92         i2c_master_recv(client, buf, sizeof(buf));
  93         return buf[reg];
  94 }
  95 #endif
  96
  97 /* ------------------------------------------------------------------------ */
  98
  99 static int upd64083_s_routing(struct v4l2_subdev *sd,
 100                               u32 input, u32 output, u32 config)
 101 {
 102         struct upd64083_state *state = to_state(sd);
 103         u8 r00, r02;
 104
 105         if (input > 7 || (input & 6) == 6)
 106                 return -EINVAL;
 107         state->mode = (input & 3) << 6;
 108         state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
 109         r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
 110         r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
 111         upd64083_write(sd, R00, r00);
 112         upd64083_write(sd, R02, r02);
 113         return 0;
 114 }
 115
 116 #ifdef CONFIG_VIDEO_ADV_DEBUG
 117 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 118 {
 119         reg->val = upd64083_read(sd, reg->reg & 0xff);
 120         reg->size = 1;
 121         return 0;
 122 }
 123
 124 static int upd64083_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 125 {
 126         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 127         return 0;
 128 }
 129 #endif
 130
 131 static int upd64083_log_status(struct v4l2_subdev *sd)
 132 {
 133         struct i2c_client *client = v4l2_get_subdevdata(sd);
 134         u8 buf[7];
 135
 136         i2c_master_recv(client, buf, 7);
 137         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 138                       "SA04=%02x SA05=%02x SA06=%02x\n",
 139                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 140         return 0;
 141 }
 142
 143 /* ----------------------------------------------------------------------- */
 144
 145 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 146         .log_status = upd64083_log_status,
 147 #ifdef CONFIG_VIDEO_ADV_DEBUG
 148         .g_register = upd64083_g_register,
 149         .s_register = upd64083_s_register,
 150 #endif
 151 };
 152
 153 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 154         .s_routing = upd64083_s_routing,
 155 };
 156
 157 static const struct v4l2_subdev_ops upd64083_ops = {
 158         .core = &upd64083_core_ops,
 159         .video = &upd64083_video_ops,
 160 };
 161
 162 /* ------------------------------------------------------------------------ */
 163
 164 /* i2c implementation */
 165
 166 static int upd64083_probe(struct i2c_client *client,
 167                           const struct i2c_device_id *id)
 168 {
 169         struct upd64083_state *state;
 170         struct v4l2_subdev *sd;
 171         int i;
 172
 173         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 174                 return -EIO;
 175
 176         v4l_info(client, "chip found @ 0x%x (%s)\n",
 177                         client->addr << 1, client->adapter->name);
 178
 179         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 180         if (state == NULL)
 181                 return -ENOMEM;
 182         sd = &state->sd;
 183         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 184         /* Initially assume that a ghost reduction chip is present */
 185         state->mode = 0;  /* YCS mode */
 186         state->ext_y_adc = (1 << 5);
 187         memcpy(state->regs, upd64083_init, TOT_REGS);
 188         for (i = 0; i < TOT_REGS; i++)
 189                 upd64083_write(sd, i, state->regs[i]);
 190         return 0;
 191 }
 192
 193 static int upd64083_remove(struct i2c_client *client)
 194 {
 195         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 196
 197         v4l2_device_unregister_subdev(sd);
 198         return 0;
 199 }
 200
 201 /* ----------------------------------------------------------------------- */
 202
 203 static const struct i2c_device_id upd64083_id[] = {
 204         { "upd64083", 0 },
 205         { }
 206 };
 207 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 208
 209 static struct i2c_driver upd64083_driver = {
 210         .driver = {
 211                 .name   = "upd64083",
 212         },
 213         .probe          = upd64083_probe,
 214         .remove         = upd64083_remove,
 215         .id_table       = upd64083_id,
 216 };
 217
 218 module_i2c_driver(upd64083_driver);