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-device.h> 13 #include <media/v4l2-ctrls.h> 14 15 MODULE_DESCRIPTION("TW9906 I2C subdev driver"); 16 MODULE_LICENSE("GPL v2"); 17 18 struct tw9906 { 19 struct v4l2_subdev sd; 20 struct v4l2_ctrl_handler hdl; 21 v4l2_std_id norm; 22 }; 23 24 static inline struct tw9906 *to_state(struct v4l2_subdev *sd) 25 { 26 return container_of(sd, struct tw9906, sd); 27 } 28 29 static 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 61 static 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 68 static 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 78 static 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 85 static 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 } 108 109 static 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 } 129 130 static 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 /* --------------------------------------------------------------------------*/ 141 142 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = { 143 .s_ctrl = tw9906_s_ctrl, 144 }; 145 146 static const struct v4l2_subdev_core_ops tw9906_core_ops = { 147 .log_status = tw9906_log_status, 148 }; 149 150 static const struct v4l2_subdev_video_ops tw9906_video_ops = { 151 .s_std = tw9906_s_std, 152 .s_routing = tw9906_s_video_routing, 153 }; 154 155 static const struct v4l2_subdev_ops tw9906_ops = { 156 .core = &tw9906_core_ops, 157 .video = &tw9906_video_ops, 158 }; 159 160 static 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 } 204 205 static 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 /* ----------------------------------------------------------------------- */ 214 215 static const struct i2c_device_id tw9906_id[] = { 216 { "tw9906" }, 217 { } 218 }; 219 MODULE_DEVICE_TABLE(i2c, tw9906_id); 220 221 static 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 }; 229 module_i2c_driver(tw9906_driver); 230