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 27 MODULE_DESCRIPTION("TW9906 I2C subdev driver"); 28 MODULE_LICENSE("GPL v2"); 29 30 struct tw9906 { 31 struct v4l2_subdev sd; 32 struct v4l2_ctrl_handler hdl; 33 v4l2_std_id norm; 34 }; 35 36 static inline struct tw9906 *to_state(struct v4l2_subdev *sd) 37 { 38 return container_of(sd, struct tw9906, sd); 39 } 40 41 static 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 73 static 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 80 static 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 90 static 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 97 static 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 } 120 121 static 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 } 141 142 static 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 /* --------------------------------------------------------------------------*/ 153 154 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = { 155 .s_ctrl = tw9906_s_ctrl, 156 }; 157 158 static const struct v4l2_subdev_core_ops tw9906_core_ops = { 159 .log_status = tw9906_log_status, 160 }; 161 162 static const struct v4l2_subdev_video_ops tw9906_video_ops = { 163 .s_std = tw9906_s_std, 164 .s_routing = tw9906_s_video_routing, 165 }; 166 167 static const struct v4l2_subdev_ops tw9906_ops = { 168 .core = &tw9906_core_ops, 169 .video = &tw9906_video_ops, 170 }; 171 172 static 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 } 217 218 static 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 /* ----------------------------------------------------------------------- */ 228 229 static const struct i2c_device_id tw9906_id[] = { 230 { "tw9906", 0 }, 231 { } 232 }; 233 MODULE_DEVICE_TABLE(i2c, tw9906_id); 234 235 static 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 }; 243 module_i2c_driver(tw9906_driver); 244