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 <linux/slab.h> 20 #include <media/v4l2-device.h> 21 #include <media/v4l2-ctrls.h> 22 23 MODULE_DESCRIPTION("TW9906 I2C subdev driver"); 24 MODULE_LICENSE("GPL v2"); 25 26 struct tw9906 { 27 struct v4l2_subdev sd; 28 struct v4l2_ctrl_handler hdl; 29 v4l2_std_id norm; 30 }; 31 32 static inline struct tw9906 *to_state(struct v4l2_subdev *sd) 33 { 34 return container_of(sd, struct tw9906, sd); 35 } 36 37 static const u8 initial_registers[] = { 38 0x02, 0x40, /* input 0, composite */ 39 0x03, 0xa2, /* correct digital format */ 40 0x05, 0x81, /* or 0x01 for PAL */ 41 0x07, 0x02, /* window */ 42 0x08, 0x14, /* window */ 43 0x09, 0xf0, /* window */ 44 0x0a, 0x10, /* window */ 45 0x0b, 0xd0, /* window */ 46 0x0d, 0x00, /* scaling */ 47 0x0e, 0x11, /* scaling */ 48 0x0f, 0x00, /* scaling */ 49 0x10, 0x00, /* brightness */ 50 0x11, 0x60, /* contrast */ 51 0x12, 0x11, /* sharpness */ 52 0x13, 0x7e, /* U gain */ 53 0x14, 0x7e, /* V gain */ 54 0x15, 0x00, /* hue */ 55 0x19, 0x57, /* vbi */ 56 0x1a, 0x0f, 57 0x1b, 0x40, 58 0x29, 0x03, 59 0x55, 0x00, 60 0x6b, 0x26, 61 0x6c, 0x36, 62 0x6d, 0xf0, 63 0x6e, 0x41, 64 0x6f, 0x13, 65 0xad, 0x70, 66 0x00, 0x00, /* Terminator (reg 0x00 is read-only) */ 67 }; 68 69 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value) 70 { 71 struct i2c_client *client = v4l2_get_subdevdata(sd); 72 73 return i2c_smbus_write_byte_data(client, reg, value); 74 } 75 76 static int write_regs(struct v4l2_subdev *sd, const u8 *regs) 77 { 78 int i; 79 80 for (i = 0; regs[i] != 0x00; i += 2) 81 if (write_reg(sd, regs[i], regs[i + 1]) < 0) 82 return -1; 83 return 0; 84 } 85 86 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input, 87 u32 output, u32 config) 88 { 89 write_reg(sd, 0x02, 0x40 | (input << 1)); 90 return 0; 91 } 92 93 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) 94 { 95 struct tw9906 *dec = to_state(sd); 96 bool is_60hz = norm & V4L2_STD_525_60; 97 static const u8 config_60hz[] = { 98 0x05, 0x81, 99 0x07, 0x02, 100 0x08, 0x14, 101 0x09, 0xf0, 102 0, 0, 103 }; 104 static const u8 config_50hz[] = { 105 0x05, 0x01, 106 0x07, 0x12, 107 0x08, 0x18, 108 0x09, 0x20, 109 0, 0, 110 }; 111 112 write_regs(sd, is_60hz ? config_60hz : config_50hz); 113 dec->norm = norm; 114 return 0; 115 } 116 117 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl) 118 { 119 struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl); 120 struct v4l2_subdev *sd = &dec->sd; 121 122 switch (ctrl->id) { 123 case V4L2_CID_BRIGHTNESS: 124 write_reg(sd, 0x10, ctrl->val); 125 break; 126 case V4L2_CID_CONTRAST: 127 write_reg(sd, 0x11, ctrl->val); 128 break; 129 case V4L2_CID_HUE: 130 write_reg(sd, 0x15, ctrl->val); 131 break; 132 default: 133 return -EINVAL; 134 } 135 return 0; 136 } 137 138 static int tw9906_log_status(struct v4l2_subdev *sd) 139 { 140 struct tw9906 *dec = to_state(sd); 141 bool is_60hz = dec->norm & V4L2_STD_525_60; 142 143 v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50); 144 v4l2_ctrl_subdev_log_status(sd); 145 return 0; 146 } 147 148 /* --------------------------------------------------------------------------*/ 149 150 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = { 151 .s_ctrl = tw9906_s_ctrl, 152 }; 153 154 static const struct v4l2_subdev_core_ops tw9906_core_ops = { 155 .log_status = tw9906_log_status, 156 }; 157 158 static const struct v4l2_subdev_video_ops tw9906_video_ops = { 159 .s_std = tw9906_s_std, 160 .s_routing = tw9906_s_video_routing, 161 }; 162 163 static const struct v4l2_subdev_ops tw9906_ops = { 164 .core = &tw9906_core_ops, 165 .video = &tw9906_video_ops, 166 }; 167 168 static int tw9906_probe(struct i2c_client *client, 169 const struct i2c_device_id *id) 170 { 171 struct tw9906 *dec; 172 struct v4l2_subdev *sd; 173 struct v4l2_ctrl_handler *hdl; 174 175 /* Check if the adapter supports the needed features */ 176 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 177 return -EIO; 178 179 v4l_info(client, "chip found @ 0x%02x (%s)\n", 180 client->addr << 1, client->adapter->name); 181 182 dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL); 183 if (dec == NULL) 184 return -ENOMEM; 185 sd = &dec->sd; 186 v4l2_i2c_subdev_init(sd, client, &tw9906_ops); 187 hdl = &dec->hdl; 188 v4l2_ctrl_handler_init(hdl, 4); 189 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, 190 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0); 191 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, 192 V4L2_CID_CONTRAST, 0, 255, 1, 0x60); 193 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops, 194 V4L2_CID_HUE, -128, 127, 1, 0); 195 sd->ctrl_handler = hdl; 196 if (hdl->error) { 197 int err = hdl->error; 198 199 v4l2_ctrl_handler_free(hdl); 200 return err; 201 } 202 203 /* Initialize tw9906 */ 204 dec->norm = V4L2_STD_NTSC; 205 206 if (write_regs(sd, initial_registers) < 0) { 207 v4l2_err(client, "error initializing TW9906\n"); 208 return -EINVAL; 209 } 210 211 return 0; 212 } 213 214 static int tw9906_remove(struct i2c_client *client) 215 { 216 struct v4l2_subdev *sd = i2c_get_clientdata(client); 217 218 v4l2_device_unregister_subdev(sd); 219 v4l2_ctrl_handler_free(&to_state(sd)->hdl); 220 return 0; 221 } 222 223 /* ----------------------------------------------------------------------- */ 224 225 static const struct i2c_device_id tw9906_id[] = { 226 { "tw9906", 0 }, 227 { } 228 }; 229 MODULE_DEVICE_TABLE(i2c, tw9906_id); 230 231 static struct i2c_driver tw9906_driver = { 232 .driver = { 233 .name = "tw9906", 234 }, 235 .probe = tw9906_probe, 236 .remove = tw9906_remove, 237 .id_table = tw9906_id, 238 }; 239 module_i2c_driver(tw9906_driver); 240