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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-device.h>13#include <media/v4l2-ctrls.h>14 15MODULE_DESCRIPTION("TW9906 I2C subdev driver");16MODULE_LICENSE("GPL v2");17 18struct tw9906 {19 struct v4l2_subdev sd;20 struct v4l2_ctrl_handler hdl;21 v4l2_std_id norm;22};23 24static inline struct tw9906 *to_state(struct v4l2_subdev *sd)25{26 return container_of(sd, struct tw9906, sd);27}28 29static 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 61static 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 68static 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 78static 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 85static 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 109static 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 130static 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 142static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {143 .s_ctrl = tw9906_s_ctrl,144};145 146static const struct v4l2_subdev_core_ops tw9906_core_ops = {147 .log_status = tw9906_log_status,148};149 150static const struct v4l2_subdev_video_ops tw9906_video_ops = {151 .s_std = tw9906_s_std,152 .s_routing = tw9906_s_video_routing,153};154 155static const struct v4l2_subdev_ops tw9906_ops = {156 .core = &tw9906_core_ops,157 .video = &tw9906_video_ops,158};159 160static int tw9906_probe(struct i2c_client *client)161{162 struct tw9906 *dec;163 struct v4l2_subdev *sd;164 struct v4l2_ctrl_handler *hdl;165 166 /* Check if the adapter supports the needed features */167 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))168 return -EIO;169 170 v4l_info(client, "chip found @ 0x%02x (%s)\n",171 client->addr << 1, client->adapter->name);172 173 dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);174 if (dec == NULL)175 return -ENOMEM;176 sd = &dec->sd;177 v4l2_i2c_subdev_init(sd, client, &tw9906_ops);178 hdl = &dec->hdl;179 v4l2_ctrl_handler_init(hdl, 4);180 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,181 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);182 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,183 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);184 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,185 V4L2_CID_HUE, -128, 127, 1, 0);186 sd->ctrl_handler = hdl;187 if (hdl->error) {188 int err = hdl->error;189 190 v4l2_ctrl_handler_free(hdl);191 return err;192 }193 194 /* Initialize tw9906 */195 dec->norm = V4L2_STD_NTSC;196 197 if (write_regs(sd, initial_registers) < 0) {198 v4l2_err(client, "error initializing TW9906\n");199 return -EINVAL;200 }201 202 return 0;203}204 205static void tw9906_remove(struct i2c_client *client)206{207 struct v4l2_subdev *sd = i2c_get_clientdata(client);208 209 v4l2_device_unregister_subdev(sd);210 v4l2_ctrl_handler_free(&to_state(sd)->hdl);211}212 213/* ----------------------------------------------------------------------- */214 215static const struct i2c_device_id tw9906_id[] = {216 { "tw9906" },217 { }218};219MODULE_DEVICE_TABLE(i2c, tw9906_id);220 221static struct i2c_driver tw9906_driver = {222 .driver = {223 .name = "tw9906",224 },225 .probe = tw9906_probe,226 .remove = tw9906_remove,227 .id_table = tw9906_id,228};229module_i2c_driver(tw9906_driver);230