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-subdev.h> 13 #include <media/v4l2-device.h> 14 #include <media/v4l2-ctrls.h> 15 16 #define TW2804_REG_AUTOGAIN 0x02 17 #define TW2804_REG_HUE 0x0f 18 #define TW2804_REG_SATURATION 0x10 19 #define TW2804_REG_CONTRAST 0x11 20 #define TW2804_REG_BRIGHTNESS 0x12 21 #define TW2804_REG_COLOR_KILLER 0x14 22 #define TW2804_REG_GAIN 0x3c 23 #define TW2804_REG_CHROMA_GAIN 0x3d 24 #define TW2804_REG_BLUE_BALANCE 0x3e 25 #define TW2804_REG_RED_BALANCE 0x3f 26 27 struct tw2804 { 28 struct v4l2_subdev sd; 29 struct v4l2_ctrl_handler hdl; 30 u8 channel:2; 31 u8 input:1; 32 int norm; 33 }; 34 35 static const u8 global_registers[] = { 36 0x39, 0x00, 37 0x3a, 0xff, 38 0x3b, 0x84, 39 0x3c, 0x80, 40 0x3d, 0x80, 41 0x3e, 0x82, 42 0x3f, 0x82, 43 0x78, 0x00, 44 0xff, 0xff, /* Terminator (reg 0xff does not exist) */ 45 }; 46 47 static const u8 channel_registers[] = { 48 0x01, 0xc4, 49 0x02, 0xa5, 50 0x03, 0x20, 51 0x04, 0xd0, 52 0x05, 0x20, 53 0x06, 0xd0, 54 0x07, 0x88, 55 0x08, 0x20, 56 0x09, 0x07, 57 0x0a, 0xf0, 58 0x0b, 0x07, 59 0x0c, 0xf0, 60 0x0d, 0x40, 61 0x0e, 0xd2, 62 0x0f, 0x80, 63 0x10, 0x80, 64 0x11, 0x80, 65 0x12, 0x80, 66 0x13, 0x1f, 67 0x14, 0x00, 68 0x15, 0x00, 69 0x16, 0x00, 70 0x17, 0x00, 71 0x18, 0xff, 72 0x19, 0xff, 73 0x1a, 0xff, 74 0x1b, 0xff, 75 0x1c, 0xff, 76 0x1d, 0xff, 77 0x1e, 0xff, 78 0x1f, 0xff, 79 0x20, 0x07, 80 0x21, 0x07, 81 0x22, 0x00, 82 0x23, 0x91, 83 0x24, 0x51, 84 0x25, 0x03, 85 0x26, 0x00, 86 0x27, 0x00, 87 0x28, 0x00, 88 0x29, 0x00, 89 0x2a, 0x00, 90 0x2b, 0x00, 91 0x2c, 0x00, 92 0x2d, 0x00, 93 0x2e, 0x00, 94 0x2f, 0x00, 95 0x30, 0x00, 96 0x31, 0x00, 97 0x32, 0x00, 98 0x33, 0x00, 99 0x34, 0x00, 100 0x35, 0x00, 101 0x36, 0x00, 102 0x37, 0x00, 103 0xff, 0xff, /* Terminator (reg 0xff does not exist) */ 104 }; 105 106 static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel) 107 { 108 return i2c_smbus_write_byte_data(client, reg | (channel << 6), value); 109 } 110 111 static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel) 112 { 113 int ret; 114 int i; 115 116 for (i = 0; regs[i] != 0xff; i += 2) { 117 ret = i2c_smbus_write_byte_data(client, 118 regs[i] | (channel << 6), regs[i + 1]); 119 if (ret < 0) 120 return ret; 121 } 122 return 0; 123 } 124 125 static int read_reg(struct i2c_client *client, u8 reg, u8 channel) 126 { 127 return i2c_smbus_read_byte_data(client, (reg) | (channel << 6)); 128 } 129 130 static inline struct tw2804 *to_state(struct v4l2_subdev *sd) 131 { 132 return container_of(sd, struct tw2804, sd); 133 } 134 135 static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl) 136 { 137 return container_of(ctrl->handler, struct tw2804, hdl); 138 } 139 140 static int tw2804_log_status(struct v4l2_subdev *sd) 141 { 142 struct tw2804 *state = to_state(sd); 143 144 v4l2_info(sd, "Standard: %s\n", 145 state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz"); 146 v4l2_info(sd, "Channel: %d\n", state->channel); 147 v4l2_info(sd, "Input: %d\n", state->input); 148 return v4l2_ctrl_subdev_log_status(sd); 149 } 150 151 /* 152 * These volatile controls are needed because all four channels share 153 * these controls. So a change made to them through one channel would 154 * require another channel to be updated. 155 * 156 * Normally this would have been done in a different way, but since the one 157 * board that uses this driver sees this single chip as if it was on four 158 * different i2c adapters (each adapter belonging to a separate instance of 159 * the same USB driver) there is no reliable method that I have found to let 160 * the instances know about each other. 161 * 162 * So implementing these global registers as volatile is the best we can do. 163 */ 164 static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl) 165 { 166 struct tw2804 *state = to_state_from_ctrl(ctrl); 167 struct i2c_client *client = v4l2_get_subdevdata(&state->sd); 168 169 switch (ctrl->id) { 170 case V4L2_CID_GAIN: 171 ctrl->val = read_reg(client, TW2804_REG_GAIN, 0); 172 return 0; 173 174 case V4L2_CID_CHROMA_GAIN: 175 ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0); 176 return 0; 177 178 case V4L2_CID_BLUE_BALANCE: 179 ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0); 180 return 0; 181 182 case V4L2_CID_RED_BALANCE: 183 ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0); 184 return 0; 185 } 186 return 0; 187 } 188 189 static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl) 190 { 191 struct tw2804 *state = to_state_from_ctrl(ctrl); 192 struct i2c_client *client = v4l2_get_subdevdata(&state->sd); 193 int addr; 194 int reg; 195 196 switch (ctrl->id) { 197 case V4L2_CID_AUTOGAIN: 198 addr = TW2804_REG_AUTOGAIN; 199 reg = read_reg(client, addr, state->channel); 200 if (reg < 0) 201 return reg; 202 if (ctrl->val == 0) 203 reg &= ~(1 << 7); 204 else 205 reg |= 1 << 7; 206 return write_reg(client, addr, reg, state->channel); 207 208 case V4L2_CID_COLOR_KILLER: 209 addr = TW2804_REG_COLOR_KILLER; 210 reg = read_reg(client, addr, state->channel); 211 if (reg < 0) 212 return reg; 213 reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03); 214 return write_reg(client, addr, reg, state->channel); 215 216 case V4L2_CID_GAIN: 217 return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0); 218 219 case V4L2_CID_CHROMA_GAIN: 220 return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0); 221 222 case V4L2_CID_BLUE_BALANCE: 223 return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0); 224 225 case V4L2_CID_RED_BALANCE: 226 return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0); 227 228 case V4L2_CID_BRIGHTNESS: 229 return write_reg(client, TW2804_REG_BRIGHTNESS, 230 ctrl->val, state->channel); 231 232 case V4L2_CID_CONTRAST: 233 return write_reg(client, TW2804_REG_CONTRAST, 234 ctrl->val, state->channel); 235 236 case V4L2_CID_SATURATION: 237 return write_reg(client, TW2804_REG_SATURATION, 238 ctrl->val, state->channel); 239 240 case V4L2_CID_HUE: 241 return write_reg(client, TW2804_REG_HUE, 242 ctrl->val, state->channel); 243 244 default: 245 break; 246 } 247 return -EINVAL; 248 } 249 250 static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) 251 { 252 struct tw2804 *dec = to_state(sd); 253 struct i2c_client *client = v4l2_get_subdevdata(sd); 254 bool is_60hz = norm & V4L2_STD_525_60; 255 u8 regs[] = { 256 0x01, is_60hz ? 0xc4 : 0x84, 257 0x09, is_60hz ? 0x07 : 0x04, 258 0x0a, is_60hz ? 0xf0 : 0x20, 259 0x0b, is_60hz ? 0x07 : 0x04, 260 0x0c, is_60hz ? 0xf0 : 0x20, 261 0x0d, is_60hz ? 0x40 : 0x4a, 262 0x16, is_60hz ? 0x00 : 0x40, 263 0x17, is_60hz ? 0x00 : 0x40, 264 0x20, is_60hz ? 0x07 : 0x0f, 265 0x21, is_60hz ? 0x07 : 0x0f, 266 0xff, 0xff, 267 }; 268 269 write_regs(client, regs, dec->channel); 270 dec->norm = norm; 271 return 0; 272 } 273 274 static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output, 275 u32 config) 276 { 277 struct tw2804 *dec = to_state(sd); 278 struct i2c_client *client = v4l2_get_subdevdata(sd); 279 int reg; 280 281 if (config && config - 1 != dec->channel) { 282 if (config > 4) { 283 dev_err(&client->dev, 284 "channel %d is not between 1 and 4!\n", config); 285 return -EINVAL; 286 } 287 dec->channel = config - 1; 288 dev_dbg(&client->dev, "initializing TW2804 channel %d\n", 289 dec->channel); 290 if (dec->channel == 0 && 291 write_regs(client, global_registers, 0) < 0) { 292 dev_err(&client->dev, 293 "error initializing TW2804 global registers\n"); 294 return -EIO; 295 } 296 if (write_regs(client, channel_registers, dec->channel) < 0) { 297 dev_err(&client->dev, 298 "error initializing TW2804 channel %d\n", 299 dec->channel); 300 return -EIO; 301 } 302 } 303 304 if (input > 1) 305 return -EINVAL; 306 307 if (input == dec->input) 308 return 0; 309 310 reg = read_reg(client, 0x22, dec->channel); 311 312 if (reg >= 0) { 313 if (input == 0) 314 reg &= ~(1 << 2); 315 else 316 reg |= 1 << 2; 317 reg = write_reg(client, 0x22, reg, dec->channel); 318 } 319 320 if (reg >= 0) 321 dec->input = input; 322 else 323 return reg; 324 return 0; 325 } 326 327 static const struct v4l2_ctrl_ops tw2804_ctrl_ops = { 328 .g_volatile_ctrl = tw2804_g_volatile_ctrl, 329 .s_ctrl = tw2804_s_ctrl, 330 }; 331 332 static const struct v4l2_subdev_video_ops tw2804_video_ops = { 333 .s_std = tw2804_s_std, 334 .s_routing = tw2804_s_video_routing, 335 }; 336 337 static const struct v4l2_subdev_core_ops tw2804_core_ops = { 338 .log_status = tw2804_log_status, 339 }; 340 341 static const struct v4l2_subdev_ops tw2804_ops = { 342 .core = &tw2804_core_ops, 343 .video = &tw2804_video_ops, 344 }; 345 346 static int tw2804_probe(struct i2c_client *client, 347 const struct i2c_device_id *id) 348 { 349 struct i2c_adapter *adapter = client->adapter; 350 struct tw2804 *state; 351 struct v4l2_subdev *sd; 352 struct v4l2_ctrl *ctrl; 353 int err; 354 355 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 356 return -ENODEV; 357 358 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 359 if (state == NULL) 360 return -ENOMEM; 361 sd = &state->sd; 362 v4l2_i2c_subdev_init(sd, client, &tw2804_ops); 363 state->channel = -1; 364 state->norm = V4L2_STD_NTSC; 365 366 v4l2_ctrl_handler_init(&state->hdl, 10); 367 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 368 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128); 369 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 370 V4L2_CID_CONTRAST, 0, 255, 1, 128); 371 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 372 V4L2_CID_SATURATION, 0, 255, 1, 128); 373 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 374 V4L2_CID_HUE, 0, 255, 1, 128); 375 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 376 V4L2_CID_COLOR_KILLER, 0, 1, 1, 0); 377 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 378 V4L2_CID_AUTOGAIN, 0, 1, 1, 0); 379 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 380 V4L2_CID_GAIN, 0, 255, 1, 128); 381 if (ctrl) 382 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 383 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 384 V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128); 385 if (ctrl) 386 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 387 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 388 V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122); 389 if (ctrl) 390 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 391 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops, 392 V4L2_CID_RED_BALANCE, 0, 255, 1, 122); 393 if (ctrl) 394 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 395 sd->ctrl_handler = &state->hdl; 396 err = state->hdl.error; 397 if (err) { 398 v4l2_ctrl_handler_free(&state->hdl); 399 return err; 400 } 401 402 v4l_info(client, "chip found @ 0x%02x (%s)\n", 403 client->addr << 1, client->adapter->name); 404 405 return 0; 406 } 407 408 static void tw2804_remove(struct i2c_client *client) 409 { 410 struct v4l2_subdev *sd = i2c_get_clientdata(client); 411 struct tw2804 *state = to_state(sd); 412 413 v4l2_device_unregister_subdev(sd); 414 v4l2_ctrl_handler_free(&state->hdl); 415 } 416 417 static const struct i2c_device_id tw2804_id[] = { 418 { "tw2804", 0 }, 419 { } 420 }; 421 MODULE_DEVICE_TABLE(i2c, tw2804_id); 422 423 static struct i2c_driver tw2804_driver = { 424 .driver = { 425 .name = "tw2804", 426 }, 427 .probe = tw2804_probe, 428 .remove = tw2804_remove, 429 .id_table = tw2804_id, 430 }; 431 432 module_i2c_driver(tw2804_driver); 433 434 MODULE_LICENSE("GPL v2"); 435 MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver"); 436 MODULE_AUTHOR("Micronas USA Inc"); 437