kernel/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  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/i2c.h>
  21 #include <linux/videodev2.h>
  22 #include <linux/ioctl.h>
  23 #include <linux/slab.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-ctrls.h>
  26
  27 MODULE_DESCRIPTION("TW9906 I2C subdev driver");
  28 MODULE_LICENSE("GPL v2");
  29
  30 struct tw9906 {
  31         struct v4l2_subdev sd;
  32         struct v4l2_ctrl_handler hdl;
  33         v4l2_std_id norm;
  34 };
  35
  36 static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
  37 {
  38         return container_of(sd, struct tw9906, sd);
  39 }
  40
  41 static const u8 initial_registers[] = {
  42         0x02, 0x40, /* input 0, composite */
  43         0x03, 0xa2, /* correct digital format */
  44         0x05, 0x81, /* or 0x01 for PAL */
  45         0x07, 0x02, /* window */
  46         0x08, 0x14, /* window */
  47         0x09, 0xf0, /* window */
  48         0x0a, 0x10, /* window */
  49         0x0b, 0xd0, /* window */
  50         0x0d, 0x00, /* scaling */
  51         0x0e, 0x11, /* scaling */
  52         0x0f, 0x00, /* scaling */
  53         0x10, 0x00, /* brightness */
  54         0x11, 0x60, /* contrast */
  55         0x12, 0x11, /* sharpness */
  56         0x13, 0x7e, /* U gain */
  57         0x14, 0x7e, /* V gain */
  58         0x15, 0x00, /* hue */
  59         0x19, 0x57, /* vbi */
  60         0x1a, 0x0f,
  61         0x1b, 0x40,
  62         0x29, 0x03,
  63         0x55, 0x00,
  64         0x6b, 0x26,
  65         0x6c, 0x36,
  66         0x6d, 0xf0,
  67         0x6e, 0x41,
  68         0x6f, 0x13,
  69         0xad, 0x70,
  70         0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
  71 };
  72
  73 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  74 {
  75         struct i2c_client *client = v4l2_get_subdevdata(sd);
  76
  77         return i2c_smbus_write_byte_data(client, reg, value);
  78 }
  79
  80 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
  81 {
  82         int i;
  83
  84         for (i = 0; regs[i] != 0x00; i += 2)
  85                 if (write_reg(sd, regs[i], regs[i + 1]) < 0)
  86                         return -1;
  87         return 0;
  88 }
  89
  90 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
  91                                       u32 output, u32 config)
  92 {
  93         write_reg(sd, 0x02, 0x40 | (input << 1));
  94         return 0;
  95 }
  96
  97 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  98 {
  99         struct tw9906 *dec = to_state(sd);
 100         bool is_60hz = norm & V4L2_STD_525_60;
 101         static const u8 config_60hz[] = {
 102                 0x05, 0x81,
 103                 0x07, 0x02,
 104                 0x08, 0x14,
 105                 0x09, 0xf0,
 106                 0,    0,
 107         };
 108         static const u8 config_50hz[] = {
 109                 0x05, 0x01,
 110                 0x07, 0x12,
 111                 0x08, 0x18,
 112                 0x09, 0x20,
 113                 0,    0,
 114         };
 115
 116         write_regs(sd, is_60hz ? config_60hz : config_50hz);
 117         dec->norm = norm;
 118         return 0;
 119 }
 120
 121 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
 122 {
 123         struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
 124         struct v4l2_subdev *sd = &dec->sd;
 125
 126         switch (ctrl->id) {
 127         case V4L2_CID_BRIGHTNESS:
 128                 write_reg(sd, 0x10, ctrl->val);
 129                 break;
 130         case V4L2_CID_CONTRAST:
 131                 write_reg(sd, 0x11, ctrl->val);
 132                 break;
 133         case V4L2_CID_HUE:
 134                 write_reg(sd, 0x15, ctrl->val);
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139         return 0;
 140 }
 141
 142 static int tw9906_log_status(struct v4l2_subdev *sd)
 143 {
 144         struct tw9906 *dec = to_state(sd);
 145         bool is_60hz = dec->norm & V4L2_STD_525_60;
 146
 147         v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 148         v4l2_ctrl_subdev_log_status(sd);
 149         return 0;
 150 }
 151
 152 /* --------------------------------------------------------------------------*/
 153
 154 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
 155         .s_ctrl = tw9906_s_ctrl,
 156 };
 157
 158 static const struct v4l2_subdev_core_ops tw9906_core_ops = {
 159         .log_status = tw9906_log_status,
 160 };
 161
 162 static const struct v4l2_subdev_video_ops tw9906_video_ops = {
 163         .s_std = tw9906_s_std,
 164         .s_routing = tw9906_s_video_routing,
 165 };
 166
 167 static const struct v4l2_subdev_ops tw9906_ops = {
 168         .core = &tw9906_core_ops,
 169         .video = &tw9906_video_ops,
 170 };
 171
 172 static int tw9906_probe(struct i2c_client *client,
 173                              const struct i2c_device_id *id)
 174 {
 175         struct tw9906 *dec;
 176         struct v4l2_subdev *sd;
 177         struct v4l2_ctrl_handler *hdl;
 178
 179         /* Check if the adapter supports the needed features */
 180         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 181                 return -EIO;
 182
 183         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 184                         client->addr << 1, client->adapter->name);
 185
 186         dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 187         if (dec == NULL)
 188                 return -ENOMEM;
 189         sd = &dec->sd;
 190         v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
 191         hdl = &dec->hdl;
 192         v4l2_ctrl_handler_init(hdl, 4);
 193         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 194                 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 195         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 196                 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 197         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 198                 V4L2_CID_HUE, -128, 127, 1, 0);
 199         sd->ctrl_handler = hdl;
 200         if (hdl->error) {
 201                 int err = hdl->error;
 202
 203                 v4l2_ctrl_handler_free(hdl);
 204                 return err;
 205         }
 206
 207         /* Initialize tw9906 */
 208         dec->norm = V4L2_STD_NTSC;
 209
 210         if (write_regs(sd, initial_registers) < 0) {
 211                 v4l2_err(client, "error initializing TW9906\n");
 212                 return -EINVAL;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int tw9906_remove(struct i2c_client *client)
 219 {
 220         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 221
 222         v4l2_device_unregister_subdev(sd);
 223         v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 224         return 0;
 225 }
 226
 227 /* ----------------------------------------------------------------------- */
 228
 229 static const struct i2c_device_id tw9906_id[] = {
 230         { "tw9906", 0 },
 231         { }
 232 };
 233 MODULE_DEVICE_TABLE(i2c, tw9906_id);
 234
 235 static struct i2c_driver tw9906_driver = {
 236         .driver = {
 237                 .owner  = THIS_MODULE,
 238                 .name   = "tw9906",
 239         },
 240         .probe = tw9906_probe,
 241         .remove = tw9906_remove,
 242         .id_table = tw9906_id,
 243 };
 244 module_i2c_driver(tw9906_driver);