linux/drivers/media/i2c/tw9906.c
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   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
  27MODULE_DESCRIPTION("TW9906 I2C subdev driver");
  28MODULE_LICENSE("GPL v2");
  29
  30struct tw9906 {
  31        struct v4l2_subdev sd;
  32        struct v4l2_ctrl_handler hdl;
  33        v4l2_std_id norm;
  34};
  35
  36static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
  37{
  38        return container_of(sd, struct tw9906, sd);
  39}
  40
  41static 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
  73static 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
  80static 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
  90static 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
  97static 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
 121static 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
 142static 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
 154static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
 155        .s_ctrl = tw9906_s_ctrl,
 156};
 157
 158static const struct v4l2_subdev_core_ops tw9906_core_ops = {
 159        .log_status = tw9906_log_status,
 160};
 161
 162static const struct v4l2_subdev_video_ops tw9906_video_ops = {
 163        .s_std = tw9906_s_std,
 164        .s_routing = tw9906_s_video_routing,
 165};
 166
 167static const struct v4l2_subdev_ops tw9906_ops = {
 168        .core = &tw9906_core_ops,
 169        .video = &tw9906_video_ops,
 170};
 171
 172static 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
 218static 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
 229static const struct i2c_device_id tw9906_id[] = {
 230        { "tw9906", 0 },
 231        { }
 232};
 233MODULE_DEVICE_TABLE(i2c, tw9906_id);
 234
 235static struct i2c_driver tw9906_driver = {
 236        .driver = {
 237                .name   = "tw9906",
 238        },
 239        .probe = tw9906_probe,
 240        .remove = tw9906_remove,
 241        .id_table = tw9906_id,
 242};
 243module_i2c_driver(tw9906_driver);
 244