drivers/media/i2c/tw9903.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 <media/v4l2-device.h>
  20 #include <media/v4l2-ctrls.h>
  21 #include <linux/slab.h>
  22
  23 MODULE_DESCRIPTION("TW9903 I2C subdev driver");
  24 MODULE_LICENSE("GPL v2");
  25
  26 /*
  27  * This driver is based on the wis-tw9903.c source that was in
  28  * drivers/staging/media/go7007. That source had commented out code for
  29  * saturation and scaling (neither seemed to work). If anyone ever gets
  30  * hardware to test this driver, then that code might be useful to look at.
  31  * You need to get the kernel sources of, say, kernel 3.8 where that
  32  * wis-tw9903 driver is still present.
  33  */
  34
  35 struct tw9903 {
  36         struct v4l2_subdev sd;
  37         struct v4l2_ctrl_handler hdl;
  38         v4l2_std_id norm;
  39 };
  40
  41 static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
  42 {
  43         return container_of(sd, struct tw9903, sd);
  44 }
  45
  46 static const u8 initial_registers[] = {
  47         0x02, 0x44, /* input 1, composite */
  48         0x03, 0x92, /* correct digital format */
  49         0x04, 0x00,
  50         0x05, 0x80, /* or 0x00 for PAL */
  51         0x06, 0x40, /* second internal current reference */
  52         0x07, 0x02, /* window */
  53         0x08, 0x14, /* window */
  54         0x09, 0xf0, /* window */
  55         0x0a, 0x81, /* window */
  56         0x0b, 0xd0, /* window */
  57         0x0c, 0x8c,
  58         0x0d, 0x00, /* scaling */
  59         0x0e, 0x11, /* scaling */
  60         0x0f, 0x00, /* scaling */
  61         0x10, 0x00, /* brightness */
  62         0x11, 0x60, /* contrast */
  63         0x12, 0x01, /* sharpness */
  64         0x13, 0x7f, /* U gain */
  65         0x14, 0x5a, /* V gain */
  66         0x15, 0x00, /* hue */
  67         0x16, 0xc3, /* sharpness */
  68         0x18, 0x00,
  69         0x19, 0x58, /* vbi */
  70         0x1a, 0x80,
  71         0x1c, 0x0f, /* video norm */
  72         0x1d, 0x7f, /* video norm */
  73         0x20, 0xa0, /* clamping gain (working 0x50) */
  74         0x21, 0x22,
  75         0x22, 0xf0,
  76         0x23, 0xfe,
  77         0x24, 0x3c,
  78         0x25, 0x38,
  79         0x26, 0x44,
  80         0x27, 0x20,
  81         0x28, 0x00,
  82         0x29, 0x15,
  83         0x2a, 0xa0,
  84         0x2b, 0x44,
  85         0x2c, 0x37,
  86         0x2d, 0x00,
  87         0x2e, 0xa5, /* burst PLL control (working: a9) */
  88         0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
  89         0x31, 0x00,
  90         0x33, 0x22,
  91         0x34, 0x11,
  92         0x35, 0x35,
  93         0x3b, 0x05,
  94         0x06, 0xc0, /* reset device */
  95         0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
  96 };
  97
  98 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  99 {
 100         struct i2c_client *client = v4l2_get_subdevdata(sd);
 101
 102         return i2c_smbus_write_byte_data(client, reg, value);
 103 }
 104
 105 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
 106 {
 107         int i;
 108
 109         for (i = 0; regs[i] != 0x00; i += 2)
 110                 if (write_reg(sd, regs[i], regs[i + 1]) < 0)
 111                         return -1;
 112         return 0;
 113 }
 114
 115 static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
 116                                       u32 output, u32 config)
 117 {
 118         write_reg(sd, 0x02, 0x40 | (input << 1));
 119         return 0;
 120 }
 121
 122 static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 123 {
 124         struct tw9903 *dec = to_state(sd);
 125         bool is_60hz = norm & V4L2_STD_525_60;
 126         static const u8 config_60hz[] = {
 127                 0x05, 0x80,
 128                 0x07, 0x02,
 129                 0x08, 0x14,
 130                 0x09, 0xf0,
 131                 0,    0,
 132         };
 133         static const u8 config_50hz[] = {
 134                 0x05, 0x00,
 135                 0x07, 0x12,
 136                 0x08, 0x18,
 137                 0x09, 0x20,
 138                 0,    0,
 139         };
 140
 141         write_regs(sd, is_60hz ? config_60hz : config_50hz);
 142         dec->norm = norm;
 143         return 0;
 144 }
 145
 146
 147 static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
 148 {
 149         struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
 150         struct v4l2_subdev *sd = &dec->sd;
 151
 152         switch (ctrl->id) {
 153         case V4L2_CID_BRIGHTNESS:
 154                 write_reg(sd, 0x10, ctrl->val);
 155                 break;
 156         case V4L2_CID_CONTRAST:
 157                 write_reg(sd, 0x11, ctrl->val);
 158                 break;
 159         case V4L2_CID_HUE:
 160                 write_reg(sd, 0x15, ctrl->val);
 161                 break;
 162         default:
 163                 return -EINVAL;
 164         }
 165         return 0;
 166 }
 167
 168 static int tw9903_log_status(struct v4l2_subdev *sd)
 169 {
 170         struct tw9903 *dec = to_state(sd);
 171         bool is_60hz = dec->norm & V4L2_STD_525_60;
 172
 173         v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 174         v4l2_ctrl_subdev_log_status(sd);
 175         return 0;
 176 }
 177
 178 /* --------------------------------------------------------------------------*/
 179
 180 static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
 181         .s_ctrl = tw9903_s_ctrl,
 182 };
 183
 184 static const struct v4l2_subdev_core_ops tw9903_core_ops = {
 185         .log_status = tw9903_log_status,
 186 };
 187
 188 static const struct v4l2_subdev_video_ops tw9903_video_ops = {
 189         .s_std = tw9903_s_std,
 190         .s_routing = tw9903_s_video_routing,
 191 };
 192
 193 static const struct v4l2_subdev_ops tw9903_ops = {
 194         .core = &tw9903_core_ops,
 195         .video = &tw9903_video_ops,
 196 };
 197
 198 /* --------------------------------------------------------------------------*/
 199
 200 static int tw9903_probe(struct i2c_client *client,
 201                              const struct i2c_device_id *id)
 202 {
 203         struct tw9903 *dec;
 204         struct v4l2_subdev *sd;
 205         struct v4l2_ctrl_handler *hdl;
 206
 207         /* Check if the adapter supports the needed features */
 208         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 209                 return -EIO;
 210
 211         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 212                         client->addr << 1, client->adapter->name);
 213
 214         dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 215         if (dec == NULL)
 216                 return -ENOMEM;
 217         sd = &dec->sd;
 218         v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
 219         hdl = &dec->hdl;
 220         v4l2_ctrl_handler_init(hdl, 4);
 221         v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 222                 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 223         v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 224                 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 225         v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
 226                 V4L2_CID_HUE, -128, 127, 1, 0);
 227         sd->ctrl_handler = hdl;
 228         if (hdl->error) {
 229                 int err = hdl->error;
 230
 231                 v4l2_ctrl_handler_free(hdl);
 232                 return err;
 233         }
 234
 235         /* Initialize tw9903 */
 236         dec->norm = V4L2_STD_NTSC;
 237
 238         if (write_regs(sd, initial_registers) < 0) {
 239                 v4l2_err(client, "error initializing TW9903\n");
 240                 return -EINVAL;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int tw9903_remove(struct i2c_client *client)
 247 {
 248         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 249
 250         v4l2_device_unregister_subdev(sd);
 251         v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 252         return 0;
 253 }
 254
 255 /* ----------------------------------------------------------------------- */
 256
 257 static const struct i2c_device_id tw9903_id[] = {
 258         { "tw9903", 0 },
 259         { }
 260 };
 261 MODULE_DEVICE_TABLE(i2c, tw9903_id);
 262
 263 static struct i2c_driver tw9903_driver = {
 264         .driver = {
 265                 .name   = "tw9903",
 266         },
 267         .probe = tw9903_probe,
 268         .remove = tw9903_remove,
 269         .id_table = tw9903_id,
 270 };
 271 module_i2c_driver(tw9903_driver);