drivers/media/i2c/tw9906.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2005-2006 Micronas USA Inc.
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/i2c.h>
   9 #include <linux/videodev2.h>
  10 #include <linux/ioctl.h>
  11 #include <linux/slab.h>
  12 #include <media/v4l2-device.h>
  13 #include <media/v4l2-ctrls.h>
  14
  15 MODULE_DESCRIPTION("TW9906 I2C subdev driver");
  16 MODULE_LICENSE("GPL v2");
  17
  18 struct tw9906 {
  19         struct v4l2_subdev sd;
  20         struct v4l2_ctrl_handler hdl;
  21         v4l2_std_id norm;
  22 };
  23
  24 static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
  25 {
  26         return container_of(sd, struct tw9906, sd);
  27 }
  28
  29 static const u8 initial_registers[] = {
  30         0x02, 0x40, /* input 0, composite */
  31         0x03, 0xa2, /* correct digital format */
  32         0x05, 0x81, /* or 0x01 for PAL */
  33         0x07, 0x02, /* window */
  34         0x08, 0x14, /* window */
  35         0x09, 0xf0, /* window */
  36         0x0a, 0x10, /* window */
  37         0x0b, 0xd0, /* window */
  38         0x0d, 0x00, /* scaling */
  39         0x0e, 0x11, /* scaling */
  40         0x0f, 0x00, /* scaling */
  41         0x10, 0x00, /* brightness */
  42         0x11, 0x60, /* contrast */
  43         0x12, 0x11, /* sharpness */
  44         0x13, 0x7e, /* U gain */
  45         0x14, 0x7e, /* V gain */
  46         0x15, 0x00, /* hue */
  47         0x19, 0x57, /* vbi */
  48         0x1a, 0x0f,
  49         0x1b, 0x40,
  50         0x29, 0x03,
  51         0x55, 0x00,
  52         0x6b, 0x26,
  53         0x6c, 0x36,
  54         0x6d, 0xf0,
  55         0x6e, 0x41,
  56         0x6f, 0x13,
  57         0xad, 0x70,
  58         0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
  59 };
  60
  61 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
  62 {
  63         struct i2c_client *client = v4l2_get_subdevdata(sd);
  64
  65         return i2c_smbus_write_byte_data(client, reg, value);
  66 }
  67
  68 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
  69 {
  70         int i;
  71
  72         for (i = 0; regs[i] != 0x00; i += 2)
  73                 if (write_reg(sd, regs[i], regs[i + 1]) < 0)
  74                         return -1;
  75         return 0;
  76 }
  77
  78 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
  79                                       u32 output, u32 config)
  80 {
  81         write_reg(sd, 0x02, 0x40 | (input << 1));
  82         return 0;
  83 }
  84
  85 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
  86 {
  87         struct tw9906 *dec = to_state(sd);
  88         bool is_60hz = norm & V4L2_STD_525_60;
  89         static const u8 config_60hz[] = {
  90                 0x05, 0x81,
  91                 0x07, 0x02,
  92                 0x08, 0x14,
  93                 0x09, 0xf0,
  94                 0,    0,
  95         };
  96         static const u8 config_50hz[] = {
  97                 0x05, 0x01,
  98                 0x07, 0x12,
  99                 0x08, 0x18,
 100                 0x09, 0x20,
 101                 0,    0,
 102         };
 103
 104         write_regs(sd, is_60hz ? config_60hz : config_50hz);
 105         dec->norm = norm;
 106         return 0;
 107 }
 108
 109 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
 110 {
 111         struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
 112         struct v4l2_subdev *sd = &dec->sd;
 113
 114         switch (ctrl->id) {
 115         case V4L2_CID_BRIGHTNESS:
 116                 write_reg(sd, 0x10, ctrl->val);
 117                 break;
 118         case V4L2_CID_CONTRAST:
 119                 write_reg(sd, 0x11, ctrl->val);
 120                 break;
 121         case V4L2_CID_HUE:
 122                 write_reg(sd, 0x15, ctrl->val);
 123                 break;
 124         default:
 125                 return -EINVAL;
 126         }
 127         return 0;
 128 }
 129
 130 static int tw9906_log_status(struct v4l2_subdev *sd)
 131 {
 132         struct tw9906 *dec = to_state(sd);
 133         bool is_60hz = dec->norm & V4L2_STD_525_60;
 134
 135         v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
 136         v4l2_ctrl_subdev_log_status(sd);
 137         return 0;
 138 }
 139
 140 /* --------------------------------------------------------------------------*/
 141
 142 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
 143         .s_ctrl = tw9906_s_ctrl,
 144 };
 145
 146 static const struct v4l2_subdev_core_ops tw9906_core_ops = {
 147         .log_status = tw9906_log_status,
 148 };
 149
 150 static const struct v4l2_subdev_video_ops tw9906_video_ops = {
 151         .s_std = tw9906_s_std,
 152         .s_routing = tw9906_s_video_routing,
 153 };
 154
 155 static const struct v4l2_subdev_ops tw9906_ops = {
 156         .core = &tw9906_core_ops,
 157         .video = &tw9906_video_ops,
 158 };
 159
 160 static int tw9906_probe(struct i2c_client *client,
 161                              const struct i2c_device_id *id)
 162 {
 163         struct tw9906 *dec;
 164         struct v4l2_subdev *sd;
 165         struct v4l2_ctrl_handler *hdl;
 166
 167         /* Check if the adapter supports the needed features */
 168         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 169                 return -EIO;
 170
 171         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 172                         client->addr << 1, client->adapter->name);
 173
 174         dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
 175         if (dec == NULL)
 176                 return -ENOMEM;
 177         sd = &dec->sd;
 178         v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
 179         hdl = &dec->hdl;
 180         v4l2_ctrl_handler_init(hdl, 4);
 181         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 182                 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
 183         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 184                 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
 185         v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
 186                 V4L2_CID_HUE, -128, 127, 1, 0);
 187         sd->ctrl_handler = hdl;
 188         if (hdl->error) {
 189                 int err = hdl->error;
 190
 191                 v4l2_ctrl_handler_free(hdl);
 192                 return err;
 193         }
 194
 195         /* Initialize tw9906 */
 196         dec->norm = V4L2_STD_NTSC;
 197
 198         if (write_regs(sd, initial_registers) < 0) {
 199                 v4l2_err(client, "error initializing TW9906\n");
 200                 return -EINVAL;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int tw9906_remove(struct i2c_client *client)
 207 {
 208         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 209
 210         v4l2_device_unregister_subdev(sd);
 211         v4l2_ctrl_handler_free(&to_state(sd)->hdl);
 212         return 0;
 213 }
 214
 215 /* ----------------------------------------------------------------------- */
 216
 217 static const struct i2c_device_id tw9906_id[] = {
 218         { "tw9906", 0 },
 219         { }
 220 };
 221 MODULE_DEVICE_TABLE(i2c, tw9906_id);
 222
 223 static struct i2c_driver tw9906_driver = {
 224         .driver = {
 225                 .name   = "tw9906",
 226         },
 227         .probe = tw9906_probe,
 228         .remove = tw9906_remove,
 229         .id_table = tw9906_id,
 230 };
 231 module_i2c_driver(tw9906_driver);