drivers/media/i2c/tw9906.c

   1 /*
   2  * Copyright (C) 2005-2006 Micronas USA Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License (Version 2) as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/i2c.h>
  17 #include <linux/videodev2.h>
  18 #include <linux/ioctl.h>
  19 #include <linux/slab.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-ctrls.h>
  22
  23 MODULE_DESCRIPTION("TW9906 I2C subdev driver");
  24 MODULE_LICENSE("GPL v2");
  25
  26 struct tw9906 {
  27         struct v4l2_subdev sd;
  28         struct v4l2_ctrl_handler hdl;
  29         v4l2_std_id norm;
  30 };
  31
  32 static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
  33 {
  34         return container_of(sd, struct tw9906, sd);
  35 }
  36
  37 static const u8 initial_registers[] = {
  38         0x02, 0x40, /* input 0, composite */
  39         0x03, 0xa2, /* correct digital format */
  40         0x05, 0x81, /* or 0x01 for PAL */
  41         0x07, 0x02, /* window */
  42         0x08, 0x14, /* window */
  43         0x09, 0xf0, /* window */
  44         0x0a, 0x10, /* window */
  45         0x0b, 0xd0, /* window */
  46         0x0d, 0x00, /* scaling */
  47         0x0e, 0x11, /* scaling */
  48         0x0f, 0x00, /* scaling */
  49         0x10, 0x00, /* brightness */
  50         0x11, 0x60, /* contrast */
  51         0x12, 0x11, /* sharpness */
  52         0x13, 0x7e, /* U gain */
  53         0x14, 0x7e, /* V gain */
  54         0x15, 0x00, /* hue */
  55         0x19, 0x57, /* vbi */
  56         0x1a, 0x0f,
  57         0x1b, 0x40,
  58         0x29, 0x03,
  59         0x55, 0x00,
  60         0x6b, 0x26,
  61         0x6c, 0x36,
  62         0x6d, 0xf0,
  63         0x6e, 0x41,
  64         0x6f, 0x13,
  65         0xad, 0x70,
  66         0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
  67 };
  68
  69 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  70 {
  71         struct i2c_client *client = v4l2_get_subdevdata(sd);
  72
  73         return i2c_smbus_write_byte_data(client, reg, value);
  74 }
  75
  76 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
  77 {
  78         int i;
  79
  80         for (i = 0; regs[i] != 0x00; i += 2)
  81                 if (write_reg(sd, regs[i], regs[i + 1]) < 0)
  82                         return -1;
  83         return 0;
  84 }
  85
  86 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
  87                                       u32 output, u32 config)
  88 {
  89         write_reg(sd, 0x02, 0x40 | (input << 1));
  90         return 0;
  91 }
  92
  93 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  94 {
  95         struct tw9906 *dec = to_state(sd);
  96         bool is_60hz = norm & V4L2_STD_525_60;
  97         static const u8 config_60hz[] = {
  98                 0x05, 0x81,
  99                 0x07, 0x02,
 100                 0x08, 0x14,
 101                 0x09, 0xf0,
 102                 0,    0,
 103         };
 104         static const u8 config_50hz[] = {
 105                 0x05, 0x01,
 106                 0x07, 0x12,
 107                 0x08, 0x18,
 108                 0x09, 0x20,
 109                 0,    0,
 110         };
 111
 112         write_regs(sd, is_60hz ? config_60hz : config_50hz);
 113         dec->norm = norm;
 114         return 0;
 115 }
 116
 117 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
 118 {
 119         struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
 120         struct v4l2_subdev *sd = &dec->sd;
 121
 122         switch (ctrl->id) {
 123         case V4L2_CID_BRIGHTNESS:
 124                 write_reg(sd, 0x10, ctrl->val);
 125                 break;
 126         case V4L2_CID_CONTRAST:
 127                 write_reg(sd, 0x11, ctrl->val);
 128                 break;
 129         case V4L2_CID_HUE:
 130                 write_reg(sd, 0x15, ctrl->val);
 131                 break;
 132         default:
 133                 return -EINVAL;
 134         }
 135         return 0;
 136 }
 137
 138 static int tw9906_log_status(struct v4l2_subdev *sd)
 139 {
 140         struct tw9906 *dec = to_state(sd);
 141         bool is_60hz = dec->norm & V4L2_STD_525_60;
 142
 143         v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 144         v4l2_ctrl_subdev_log_status(sd);
 145         return 0;
 146 }
 147
 148 /* --------------------------------------------------------------------------*/
 149
 150 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
 151         .s_ctrl = tw9906_s_ctrl,
 152 };
 153
 154 static const struct v4l2_subdev_core_ops tw9906_core_ops = {
 155         .log_status = tw9906_log_status,
 156 };
 157
 158 static const struct v4l2_subdev_video_ops tw9906_video_ops = {
 159         .s_std = tw9906_s_std,
 160         .s_routing = tw9906_s_video_routing,
 161 };
 162
 163 static const struct v4l2_subdev_ops tw9906_ops = {
 164         .core = &tw9906_core_ops,
 165         .video = &tw9906_video_ops,
 166 };
 167
 168 static int tw9906_probe(struct i2c_client *client,
 169                              const struct i2c_device_id *id)
 170 {
 171         struct tw9906 *dec;
 172         struct v4l2_subdev *sd;
 173         struct v4l2_ctrl_handler *hdl;
 174
 175         /* Check if the adapter supports the needed features */
 176         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 177                 return -EIO;
 178
 179         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 180                         client->addr << 1, client->adapter->name);
 181
 182         dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 183         if (dec == NULL)
 184                 return -ENOMEM;
 185         sd = &dec->sd;
 186         v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
 187         hdl = &dec->hdl;
 188         v4l2_ctrl_handler_init(hdl, 4);
 189         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 190                 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 191         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 192                 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 193         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 194                 V4L2_CID_HUE, -128, 127, 1, 0);
 195         sd->ctrl_handler = hdl;
 196         if (hdl->error) {
 197                 int err = hdl->error;
 198
 199                 v4l2_ctrl_handler_free(hdl);
 200                 return err;
 201         }
 202
 203         /* Initialize tw9906 */
 204         dec->norm = V4L2_STD_NTSC;
 205
 206         if (write_regs(sd, initial_registers) < 0) {
 207                 v4l2_err(client, "error initializing TW9906\n");
 208                 return -EINVAL;
 209         }
 210
 211         return 0;
 212 }
 213
 214 static int tw9906_remove(struct i2c_client *client)
 215 {
 216         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 217
 218         v4l2_device_unregister_subdev(sd);
 219         v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 220         return 0;
 221 }
 222
 223 /* ----------------------------------------------------------------------- */
 224
 225 static const struct i2c_device_id tw9906_id[] = {
 226         { "tw9906", 0 },
 227         { }
 228 };
 229 MODULE_DEVICE_TABLE(i2c, tw9906_id);
 230
 231 static struct i2c_driver tw9906_driver = {
 232         .driver = {
 233                 .name   = "tw9906",
 234         },
 235         .probe = tw9906_probe,
 236         .remove = tw9906_remove,
 237         .id_table = tw9906_id,
 238 };
 239 module_i2c_driver(tw9906_driver);