drivers/media/i2c/upd64031a.c

   1 /*
   2  * upd64031A - NEC Electronics Ghost Reduction for NTSC in Japan
   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 modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (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
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/i2c.h>
  23 #include <linux/videodev2.h>
  24 #include <linux/slab.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/i2c/upd64031a.h>
  27
  28 /* --------------------- read registers functions define -------------------- */
  29
  30 /* bit masks */
  31 #define GR_MODE_MASK              0xc0
  32 #define DIRECT_3DYCS_CONNECT_MASK 0xc0
  33 #define SYNC_CIRCUIT_MASK         0xa0
  34
  35 /* -------------------------------------------------------------------------- */
  36
  37 MODULE_DESCRIPTION("uPD64031A driver");
  38 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  39 MODULE_LICENSE("GPL");
  40
  41 static int debug;
  42 module_param(debug, int, 0644);
  43
  44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  45
  46
  47 enum {
  48         R00 = 0, R01, R02, R03, R04,
  49         R05, R06, R07, R08, R09,
  50         R0A, R0B, R0C, R0D, R0E, R0F,
  51         /* unused registers
  52          R10, R11, R12, R13, R14,
  53          R15, R16, R17,
  54          */
  55         TOT_REGS
  56 };
  57
  58 struct upd64031a_state {
  59         struct v4l2_subdev sd;
  60         u8 regs[TOT_REGS];
  61         u8 gr_mode;
  62         u8 direct_3dycs_connect;
  63         u8 ext_comp_sync;
  64         u8 ext_vert_sync;
  65 };
  66
  67 static inline struct upd64031a_state *to_state(struct v4l2_subdev *sd)
  68 {
  69         return container_of(sd, struct upd64031a_state, sd);
  70 }
  71
  72 static u8 upd64031a_init[] = {
  73         0x00, 0xb8, 0x48, 0xd2, 0xe6,
  74         0x03, 0x10, 0x0b, 0xaf, 0x7f,
  75         0x00, 0x00, 0x1d, 0x5e, 0x00,
  76         0xd0
  77 };
  78
  79 /* ------------------------------------------------------------------------ */
  80
  81 static u8 upd64031a_read(struct v4l2_subdev *sd, u8 reg)
  82 {
  83         struct i2c_client *client = v4l2_get_subdevdata(sd);
  84         u8 buf[2];
  85
  86         if (reg >= sizeof(buf))
  87                 return 0xff;
  88         i2c_master_recv(client, buf, 2);
  89         return buf[reg];
  90 }
  91
  92 /* ------------------------------------------------------------------------ */
  93
  94 static void upd64031a_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  95 {
  96         struct i2c_client *client = v4l2_get_subdevdata(sd);
  97         u8 buf[2];
  98
  99         buf[0] = reg;
 100         buf[1] = val;
 101         v4l2_dbg(1, debug, sd, "write reg: %02X val: %02X\n", reg, val);
 102         if (i2c_master_send(client, buf, 2) != 2)
 103                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
 104 }
 105
 106 /* ------------------------------------------------------------------------ */
 107
 108 /* The input changed due to new input or channel changed */
 109 static int upd64031a_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq)
 110 {
 111         struct upd64031a_state *state = to_state(sd);
 112         u8 reg = state->regs[R00];
 113
 114         v4l2_dbg(1, debug, sd, "changed input or channel\n");
 115         upd64031a_write(sd, R00, reg | 0x10);
 116         upd64031a_write(sd, R00, reg & ~0x10);
 117         return 0;
 118 }
 119
 120 /* ------------------------------------------------------------------------ */
 121
 122 static int upd64031a_s_routing(struct v4l2_subdev *sd,
 123                                u32 input, u32 output, u32 config)
 124 {
 125         struct upd64031a_state *state = to_state(sd);
 126         u8 r00, r05, r08;
 127
 128         state->gr_mode = (input & 3) << 6;
 129         state->direct_3dycs_connect = (input & 0xc) << 4;
 130         state->ext_comp_sync =
 131                 (input & UPD64031A_COMPOSITE_EXTERNAL) << 1;
 132         state->ext_vert_sync =
 133                 (input & UPD64031A_VERTICAL_EXTERNAL) << 2;
 134         r00 = (state->regs[R00] & ~GR_MODE_MASK) | state->gr_mode;
 135         r05 = (state->regs[R00] & ~SYNC_CIRCUIT_MASK) |
 136                 state->ext_comp_sync | state->ext_vert_sync;
 137         r08 = (state->regs[R08] & ~DIRECT_3DYCS_CONNECT_MASK) |
 138                 state->direct_3dycs_connect;
 139         upd64031a_write(sd, R00, r00);
 140         upd64031a_write(sd, R05, r05);
 141         upd64031a_write(sd, R08, r08);
 142         return upd64031a_s_frequency(sd, NULL);
 143 }
 144
 145 static int upd64031a_log_status(struct v4l2_subdev *sd)
 146 {
 147         v4l2_info(sd, "Status: SA00=0x%02x SA01=0x%02x\n",
 148                         upd64031a_read(sd, 0), upd64031a_read(sd, 1));
 149         return 0;
 150 }
 151
 152 #ifdef CONFIG_VIDEO_ADV_DEBUG
 153 static int upd64031a_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 154 {
 155         reg->val = upd64031a_read(sd, reg->reg & 0xff);
 156         reg->size = 1;
 157         return 0;
 158 }
 159
 160 static int upd64031a_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 161 {
 162         upd64031a_write(sd, reg->reg & 0xff, reg->val & 0xff);
 163         return 0;
 164 }
 165 #endif
 166
 167 /* ----------------------------------------------------------------------- */
 168
 169 static const struct v4l2_subdev_core_ops upd64031a_core_ops = {
 170         .log_status = upd64031a_log_status,
 171 #ifdef CONFIG_VIDEO_ADV_DEBUG
 172         .g_register = upd64031a_g_register,
 173         .s_register = upd64031a_s_register,
 174 #endif
 175 };
 176
 177 static const struct v4l2_subdev_tuner_ops upd64031a_tuner_ops = {
 178         .s_frequency = upd64031a_s_frequency,
 179 };
 180
 181 static const struct v4l2_subdev_video_ops upd64031a_video_ops = {
 182         .s_routing = upd64031a_s_routing,
 183 };
 184
 185 static const struct v4l2_subdev_ops upd64031a_ops = {
 186         .core = &upd64031a_core_ops,
 187         .tuner = &upd64031a_tuner_ops,
 188         .video = &upd64031a_video_ops,
 189 };
 190
 191 /* ------------------------------------------------------------------------ */
 192
 193 /* i2c implementation */
 194
 195 static int upd64031a_probe(struct i2c_client *client,
 196                            const struct i2c_device_id *id)
 197 {
 198         struct upd64031a_state *state;
 199         struct v4l2_subdev *sd;
 200         int i;
 201
 202         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 203                 return -EIO;
 204
 205         v4l_info(client, "chip found @ 0x%x (%s)\n",
 206                         client->addr << 1, client->adapter->name);
 207
 208         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 209         if (state == NULL)
 210                 return -ENOMEM;
 211         sd = &state->sd;
 212         v4l2_i2c_subdev_init(sd, client, &upd64031a_ops);
 213         memcpy(state->regs, upd64031a_init, sizeof(state->regs));
 214         state->gr_mode = UPD64031A_GR_ON << 6;
 215         state->direct_3dycs_connect = UPD64031A_3DYCS_COMPOSITE << 4;
 216         state->ext_comp_sync = state->ext_vert_sync = 0;
 217         for (i = 0; i < TOT_REGS; i++)
 218                 upd64031a_write(sd, i, state->regs[i]);
 219         return 0;
 220 }
 221
 222 static int upd64031a_remove(struct i2c_client *client)
 223 {
 224         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 225
 226         v4l2_device_unregister_subdev(sd);
 227         return 0;
 228 }
 229
 230 /* ----------------------------------------------------------------------- */
 231
 232 static const struct i2c_device_id upd64031a_id[] = {
 233         { "upd64031a", 0 },
 234         { }
 235 };
 236 MODULE_DEVICE_TABLE(i2c, upd64031a_id);
 237
 238 static struct i2c_driver upd64031a_driver = {
 239         .driver = {
 240                 .name   = "upd64031a",
 241         },
 242         .probe          = upd64031a_probe,
 243         .remove         = upd64031a_remove,
 244         .id_table       = upd64031a_id,
 245 };
 246
 247 module_i2c_driver(upd64031a_driver);