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1// SPDX-License-Identifier: GPL-2.0-only2/*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 0x0217#define TW2804_REG_HUE 0x0f18#define TW2804_REG_SATURATION 0x1019#define TW2804_REG_CONTRAST 0x1120#define TW2804_REG_BRIGHTNESS 0x1221#define TW2804_REG_COLOR_KILLER 0x1422#define TW2804_REG_GAIN 0x3c23#define TW2804_REG_CHROMA_GAIN 0x3d24#define TW2804_REG_BLUE_BALANCE 0x3e25#define TW2804_REG_RED_BALANCE 0x3f26 27struct 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 35static 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 47static 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 106static 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 111static 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 125static 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 130static inline struct tw2804 *to_state(struct v4l2_subdev *sd)131{132 return container_of(sd, struct tw2804, sd);133}134 135static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)136{137 return container_of(ctrl->handler, struct tw2804, hdl);138}139 140static 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 share153 * these controls. So a change made to them through one channel would154 * require another channel to be updated.155 *156 * Normally this would have been done in a different way, but since the one157 * board that uses this driver sees this single chip as if it was on four158 * different i2c adapters (each adapter belonging to a separate instance of159 * the same USB driver) there is no reliable method that I have found to let160 * the instances know about each other.161 *162 * So implementing these global registers as volatile is the best we can do.163 */164static 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 189static 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 else205 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 250static 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 274static 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 else316 reg |= 1 << 2;317 reg = write_reg(client, 0x22, reg, dec->channel);318 }319 320 if (reg >= 0)321 dec->input = input;322 else323 return reg;324 return 0;325}326 327static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {328 .g_volatile_ctrl = tw2804_g_volatile_ctrl,329 .s_ctrl = tw2804_s_ctrl,330};331 332static const struct v4l2_subdev_video_ops tw2804_video_ops = {333 .s_std = tw2804_s_std,334 .s_routing = tw2804_s_video_routing,335};336 337static const struct v4l2_subdev_core_ops tw2804_core_ops = {338 .log_status = tw2804_log_status,339};340 341static const struct v4l2_subdev_ops tw2804_ops = {342 .core = &tw2804_core_ops,343 .video = &tw2804_video_ops,344};345 346static int tw2804_probe(struct i2c_client *client)347{348 struct i2c_adapter *adapter = client->adapter;349 struct tw2804 *state;350 struct v4l2_subdev *sd;351 struct v4l2_ctrl *ctrl;352 int err;353 354 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))355 return -ENODEV;356 357 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);358 if (state == NULL)359 return -ENOMEM;360 sd = &state->sd;361 v4l2_i2c_subdev_init(sd, client, &tw2804_ops);362 state->channel = -1;363 state->norm = V4L2_STD_NTSC;364 365 v4l2_ctrl_handler_init(&state->hdl, 10);366 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,367 V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);368 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,369 V4L2_CID_CONTRAST, 0, 255, 1, 128);370 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,371 V4L2_CID_SATURATION, 0, 255, 1, 128);372 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,373 V4L2_CID_HUE, 0, 255, 1, 128);374 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,375 V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);376 v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,377 V4L2_CID_AUTOGAIN, 0, 1, 1, 0);378 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,379 V4L2_CID_GAIN, 0, 255, 1, 128);380 if (ctrl)381 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;382 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,383 V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128);384 if (ctrl)385 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;386 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,387 V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122);388 if (ctrl)389 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;390 ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,391 V4L2_CID_RED_BALANCE, 0, 255, 1, 122);392 if (ctrl)393 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;394 sd->ctrl_handler = &state->hdl;395 err = state->hdl.error;396 if (err) {397 v4l2_ctrl_handler_free(&state->hdl);398 return err;399 }400 401 v4l_info(client, "chip found @ 0x%02x (%s)\n",402 client->addr << 1, client->adapter->name);403 404 return 0;405}406 407static void tw2804_remove(struct i2c_client *client)408{409 struct v4l2_subdev *sd = i2c_get_clientdata(client);410 struct tw2804 *state = to_state(sd);411 412 v4l2_device_unregister_subdev(sd);413 v4l2_ctrl_handler_free(&state->hdl);414}415 416static const struct i2c_device_id tw2804_id[] = {417 { "tw2804" },418 { }419};420MODULE_DEVICE_TABLE(i2c, tw2804_id);421 422static struct i2c_driver tw2804_driver = {423 .driver = {424 .name = "tw2804",425 },426 .probe = tw2804_probe,427 .remove = tw2804_remove,428 .id_table = tw2804_id,429};430 431module_i2c_driver(tw2804_driver);432 433MODULE_LICENSE("GPL v2");434MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");435MODULE_AUTHOR("Micronas USA Inc");436