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  * 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
  27 MODULE_DESCRIPTION("TW9903 I2C subdev driver");
  28 MODULE_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
  39 struct tw9903 {
  40         struct v4l2_subdev sd;
  41         struct v4l2_ctrl_handler hdl;
  42         v4l2_std_id norm;
  43 };
  44
  45 static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
  46 {
  47         return container_of(sd, struct tw9903, sd);
  48 }
  49
  50 static 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
 102 static 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
 109 static 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
 119 static 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
 126 static 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
 151 static 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
 172 static 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
 184 static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
 185         .s_ctrl = tw9903_s_ctrl,
 186 };
 187
 188 static const struct v4l2_subdev_core_ops tw9903_core_ops = {
 189         .log_status = tw9903_log_status,
 190 };
 191
 192 static const struct v4l2_subdev_video_ops tw9903_video_ops = {
 193         .s_std = tw9903_s_std,
 194         .s_routing = tw9903_s_video_routing,
 195 };
 196
 197 static const struct v4l2_subdev_ops tw9903_ops = {
 198         .core = &tw9903_core_ops,
 199         .video = &tw9903_video_ops,
 200 };
 201
 202 /* --------------------------------------------------------------------------*/
 203
 204 static 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
 250 static 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
 261 static const struct i2c_device_id tw9903_id[] = {
 262         { "tw9903", 0 },
 263         { }
 264 };
 265 MODULE_DEVICE_TABLE(i2c, tw9903_id);
 266
 267 static struct i2c_driver tw9903_driver = {
 268         .driver = {
 269                 .owner  = THIS_MODULE,
 270                 .name   = "tw9903",
 271         },
 272         .probe = tw9903_probe,
 273         .remove = tw9903_remove,
 274         .id_table = tw9903_id,
 275 };
 276 module_i2c_driver(tw9903_driver);