linux/drivers/media/i2c/tw9903.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 <media/v4l2-device.h>
  24#include <media/v4l2-ctrls.h>
  25#include <linux/slab.h>
  26
  27MODULE_DESCRIPTION("TW9903 I2C subdev driver");
  28MODULE_LICENSE("GPL v2");
  29
  30/*
  31 * This driver is based on the wis-tw9903.c source that was in
  32 * drivers/staging/media/go7007. That source had commented out code for
  33 * saturation and scaling (neither seemed to work). If anyone ever gets
  34 * hardware to test this driver, then that code might be useful to look at.
  35 * You need to get the kernel sources of, say, kernel 3.8 where that
  36 * wis-tw9903 driver is still present.
  37 */
  38
  39struct tw9903 {
  40        struct v4l2_subdev sd;
  41        struct v4l2_ctrl_handler hdl;
  42        v4l2_std_id norm;
  43};
  44
  45static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
  46{
  47        return container_of(sd, struct tw9903, sd);
  48}
  49
  50static const u8 initial_registers[] = {
  51        0x02, 0x44, /* input 1, composite */
  52        0x03, 0x92, /* correct digital format */
  53        0x04, 0x00,
  54        0x05, 0x80, /* or 0x00 for PAL */
  55        0x06, 0x40, /* second internal current reference */
  56        0x07, 0x02, /* window */
  57        0x08, 0x14, /* window */
  58        0x09, 0xf0, /* window */
  59        0x0a, 0x81, /* window */
  60        0x0b, 0xd0, /* window */
  61        0x0c, 0x8c,
  62        0x0d, 0x00, /* scaling */
  63        0x0e, 0x11, /* scaling */
  64        0x0f, 0x00, /* scaling */
  65        0x10, 0x00, /* brightness */
  66        0x11, 0x60, /* contrast */
  67        0x12, 0x01, /* sharpness */
  68        0x13, 0x7f, /* U gain */
  69        0x14, 0x5a, /* V gain */
  70        0x15, 0x00, /* hue */
  71        0x16, 0xc3, /* sharpness */
  72        0x18, 0x00,
  73        0x19, 0x58, /* vbi */
  74        0x1a, 0x80,
  75        0x1c, 0x0f, /* video norm */
  76        0x1d, 0x7f, /* video norm */
  77        0x20, 0xa0, /* clamping gain (working 0x50) */
  78        0x21, 0x22,
  79        0x22, 0xf0,
  80        0x23, 0xfe,
  81        0x24, 0x3c,
  82        0x25, 0x38,
  83        0x26, 0x44,
  84        0x27, 0x20,
  85        0x28, 0x00,
  86        0x29, 0x15,
  87        0x2a, 0xa0,
  88        0x2b, 0x44,
  89        0x2c, 0x37,
  90        0x2d, 0x00,
  91        0x2e, 0xa5, /* burst PLL control (working: a9) */
  92        0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
  93        0x31, 0x00,
  94        0x33, 0x22,
  95        0x34, 0x11,
  96        0x35, 0x35,
  97        0x3b, 0x05,
  98        0x06, 0xc0, /* reset device */
  99        0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
 100};
 101
 102static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
 103{
 104        struct i2c_client *client = v4l2_get_subdevdata(sd);
 105
 106        return i2c_smbus_write_byte_data(client, reg, value);
 107}
 108
 109static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
 110{
 111        int i;
 112
 113        for (i = 0; regs[i] != 0x00; i += 2)
 114                if (write_reg(sd, regs[i], regs[i + 1]) < 0)
 115                        return -1;
 116        return 0;
 117}
 118
 119static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
 120                                      u32 output, u32 config)
 121{
 122        write_reg(sd, 0x02, 0x40 | (input << 1));
 123        return 0;
 124}
 125
 126static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 127{
 128        struct tw9903 *dec = to_state(sd);
 129        bool is_60hz = norm & V4L2_STD_525_60;
 130        static const u8 config_60hz[] = {
 131                0x05, 0x80,
 132                0x07, 0x02,
 133                0x08, 0x14,
 134                0x09, 0xf0,
 135                0,    0,
 136        };
 137        static const u8 config_50hz[] = {
 138                0x05, 0x00,
 139                0x07, 0x12,
 140                0x08, 0x18,
 141                0x09, 0x20,
 142                0,    0,
 143        };
 144
 145        write_regs(sd, is_60hz ? config_60hz : config_50hz);
 146        dec->norm = norm;
 147        return 0;
 148}
 149
 150
 151static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
 152{
 153        struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
 154        struct v4l2_subdev *sd = &dec->sd;
 155
 156        switch (ctrl->id) {
 157        case V4L2_CID_BRIGHTNESS:
 158                write_reg(sd, 0x10, ctrl->val);
 159                break;
 160        case V4L2_CID_CONTRAST:
 161                write_reg(sd, 0x11, ctrl->val);
 162                break;
 163        case V4L2_CID_HUE:
 164                write_reg(sd, 0x15, ctrl->val);
 165                break;
 166        default:
 167                return -EINVAL;
 168        }
 169        return 0;
 170}
 171
 172static int tw9903_log_status(struct v4l2_subdev *sd)
 173{
 174        struct tw9903 *dec = to_state(sd);
 175        bool is_60hz = dec->norm & V4L2_STD_525_60;
 176
 177        v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 178        v4l2_ctrl_subdev_log_status(sd);
 179        return 0;
 180}
 181
 182/* --------------------------------------------------------------------------*/
 183
 184static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
 185        .s_ctrl = tw9903_s_ctrl,
 186};
 187
 188static const struct v4l2_subdev_core_ops tw9903_core_ops = {
 189        .log_status = tw9903_log_status,
 190};
 191
 192static const struct v4l2_subdev_video_ops tw9903_video_ops = {
 193        .s_std = tw9903_s_std,
 194        .s_routing = tw9903_s_video_routing,
 195};
 196
 197static const struct v4l2_subdev_ops tw9903_ops = {
 198        .core = &tw9903_core_ops,
 199        .video = &tw9903_video_ops,
 200};
 201
 202/* --------------------------------------------------------------------------*/
 203
 204static int tw9903_probe(struct i2c_client *client,
 205                             const struct i2c_device_id *id)
 206{
 207        struct tw9903 *dec;
 208        struct v4l2_subdev *sd;
 209        struct v4l2_ctrl_handler *hdl;
 210
 211        /* Check if the adapter supports the needed features */
 212        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 213                return -EIO;
 214
 215        v4l_info(client, "chip found @ 0x%02x (%s)\n",
 216                        client->addr << 1, client->adapter->name);
 217
 218        dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 219        if (dec == NULL)
 220                return -ENOMEM;
 221        sd = &dec->sd;
 222        v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
 223        hdl = &dec->hdl;
 224        v4l2_ctrl_handler_init(hdl, 4);
 225        v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 226                V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 227        v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 228                V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 229        v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 230                V4L2_CID_HUE, -128, 127, 1, 0);
 231        sd->ctrl_handler = hdl;
 232        if (hdl->error) {
 233                int err = hdl->error;
 234
 235                v4l2_ctrl_handler_free(hdl);
 236                return err;
 237        }
 238
 239        /* Initialize tw9903 */
 240        dec->norm = V4L2_STD_NTSC;
 241
 242        if (write_regs(sd, initial_registers) < 0) {
 243                v4l2_err(client, "error initializing TW9903\n");
 244                return -EINVAL;
 245        }
 246
 247        return 0;
 248}
 249
 250static int tw9903_remove(struct i2c_client *client)
 251{
 252        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 253
 254        v4l2_device_unregister_subdev(sd);
 255        v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 256        return 0;
 257}
 258
 259/* ----------------------------------------------------------------------- */
 260
 261static const struct i2c_device_id tw9903_id[] = {
 262        { "tw9903", 0 },
 263        { }
 264};
 265MODULE_DEVICE_TABLE(i2c, tw9903_id);
 266
 267static struct i2c_driver tw9903_driver = {
 268        .driver = {
 269                .name   = "tw9903",
 270        },
 271        .probe = tw9903_probe,
 272        .remove = tw9903_remove,
 273        .id_table = tw9903_id,
 274};
 275module_i2c_driver(tw9903_driver);
 276