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 <media/v4l2-device.h> 12 #include <media/v4l2-ctrls.h> 13 #include <linux/slab.h> 14 15 MODULE_DESCRIPTION("TW9903 I2C subdev driver"); 16 MODULE_LICENSE("GPL v2"); 17 18 /* 19 * This driver is based on the wis-tw9903.c source that was in 20 * drivers/staging/media/go7007. That source had commented out code for 21 * saturation and scaling (neither seemed to work). If anyone ever gets 22 * hardware to test this driver, then that code might be useful to look at. 23 * You need to get the kernel sources of, say, kernel 3.8 where that 24 * wis-tw9903 driver is still present. 25 */ 26 27 struct tw9903 { 28 struct v4l2_subdev sd; 29 struct v4l2_ctrl_handler hdl; 30 v4l2_std_id norm; 31 }; 32 33 static inline struct tw9903 *to_state(struct v4l2_subdev *sd) 34 { 35 return container_of(sd, struct tw9903, sd); 36 } 37 38 static const u8 initial_registers[] = { 39 0x02, 0x44, /* input 1, composite */ 40 0x03, 0x92, /* correct digital format */ 41 0x04, 0x00, 42 0x05, 0x80, /* or 0x00 for PAL */ 43 0x06, 0x40, /* second internal current reference */ 44 0x07, 0x02, /* window */ 45 0x08, 0x14, /* window */ 46 0x09, 0xf0, /* window */ 47 0x0a, 0x81, /* window */ 48 0x0b, 0xd0, /* window */ 49 0x0c, 0x8c, 50 0x0d, 0x00, /* scaling */ 51 0x0e, 0x11, /* scaling */ 52 0x0f, 0x00, /* scaling */ 53 0x10, 0x00, /* brightness */ 54 0x11, 0x60, /* contrast */ 55 0x12, 0x01, /* sharpness */ 56 0x13, 0x7f, /* U gain */ 57 0x14, 0x5a, /* V gain */ 58 0x15, 0x00, /* hue */ 59 0x16, 0xc3, /* sharpness */ 60 0x18, 0x00, 61 0x19, 0x58, /* vbi */ 62 0x1a, 0x80, 63 0x1c, 0x0f, /* video norm */ 64 0x1d, 0x7f, /* video norm */ 65 0x20, 0xa0, /* clamping gain (working 0x50) */ 66 0x21, 0x22, 67 0x22, 0xf0, 68 0x23, 0xfe, 69 0x24, 0x3c, 70 0x25, 0x38, 71 0x26, 0x44, 72 0x27, 0x20, 73 0x28, 0x00, 74 0x29, 0x15, 75 0x2a, 0xa0, 76 0x2b, 0x44, 77 0x2c, 0x37, 78 0x2d, 0x00, 79 0x2e, 0xa5, /* burst PLL control (working: a9) */ 80 0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */ 81 0x31, 0x00, 82 0x33, 0x22, 83 0x34, 0x11, 84 0x35, 0x35, 85 0x3b, 0x05, 86 0x06, 0xc0, /* reset device */ 87 0x00, 0x00, /* Terminator (reg 0x00 is read-only) */ 88 }; 89 90 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value) 91 { 92 struct i2c_client *client = v4l2_get_subdevdata(sd); 93 94 return i2c_smbus_write_byte_data(client, reg, value); 95 } 96 97 static int write_regs(struct v4l2_subdev *sd, const u8 *regs) 98 { 99 int i; 100 101 for (i = 0; regs[i] != 0x00; i += 2) 102 if (write_reg(sd, regs[i], regs[i + 1]) < 0) 103 return -1; 104 return 0; 105 } 106 107 static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input, 108 u32 output, u32 config) 109 { 110 write_reg(sd, 0x02, 0x40 | (input << 1)); 111 return 0; 112 } 113 114 static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) 115 { 116 struct tw9903 *dec = to_state(sd); 117 bool is_60hz = norm & V4L2_STD_525_60; 118 static const u8 config_60hz[] = { 119 0x05, 0x80, 120 0x07, 0x02, 121 0x08, 0x14, 122 0x09, 0xf0, 123 0, 0, 124 }; 125 static const u8 config_50hz[] = { 126 0x05, 0x00, 127 0x07, 0x12, 128 0x08, 0x18, 129 0x09, 0x20, 130 0, 0, 131 }; 132 133 write_regs(sd, is_60hz ? config_60hz : config_50hz); 134 dec->norm = norm; 135 return 0; 136 } 137 138 139 static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl) 140 { 141 struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl); 142 struct v4l2_subdev *sd = &dec->sd; 143 144 switch (ctrl->id) { 145 case V4L2_CID_BRIGHTNESS: 146 write_reg(sd, 0x10, ctrl->val); 147 break; 148 case V4L2_CID_CONTRAST: 149 write_reg(sd, 0x11, ctrl->val); 150 break; 151 case V4L2_CID_HUE: 152 write_reg(sd, 0x15, ctrl->val); 153 break; 154 default: 155 return -EINVAL; 156 } 157 return 0; 158 } 159 160 static int tw9903_log_status(struct v4l2_subdev *sd) 161 { 162 struct tw9903 *dec = to_state(sd); 163 bool is_60hz = dec->norm & V4L2_STD_525_60; 164 165 v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50); 166 v4l2_ctrl_subdev_log_status(sd); 167 return 0; 168 } 169 170 /* --------------------------------------------------------------------------*/ 171 172 static const struct v4l2_ctrl_ops tw9903_ctrl_ops = { 173 .s_ctrl = tw9903_s_ctrl, 174 }; 175 176 static const struct v4l2_subdev_core_ops tw9903_core_ops = { 177 .log_status = tw9903_log_status, 178 }; 179 180 static const struct v4l2_subdev_video_ops tw9903_video_ops = { 181 .s_std = tw9903_s_std, 182 .s_routing = tw9903_s_video_routing, 183 }; 184 185 static const struct v4l2_subdev_ops tw9903_ops = { 186 .core = &tw9903_core_ops, 187 .video = &tw9903_video_ops, 188 }; 189 190 /* --------------------------------------------------------------------------*/ 191 192 static int tw9903_probe(struct i2c_client *client, 193 const struct i2c_device_id *id) 194 { 195 struct tw9903 *dec; 196 struct v4l2_subdev *sd; 197 struct v4l2_ctrl_handler *hdl; 198 199 /* Check if the adapter supports the needed features */ 200 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 201 return -EIO; 202 203 v4l_info(client, "chip found @ 0x%02x (%s)\n", 204 client->addr << 1, client->adapter->name); 205 206 dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL); 207 if (dec == NULL) 208 return -ENOMEM; 209 sd = &dec->sd; 210 v4l2_i2c_subdev_init(sd, client, &tw9903_ops); 211 hdl = &dec->hdl; 212 v4l2_ctrl_handler_init(hdl, 4); 213 v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops, 214 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0); 215 v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops, 216 V4L2_CID_CONTRAST, 0, 255, 1, 0x60); 217 v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops, 218 V4L2_CID_HUE, -128, 127, 1, 0); 219 sd->ctrl_handler = hdl; 220 if (hdl->error) { 221 int err = hdl->error; 222 223 v4l2_ctrl_handler_free(hdl); 224 return err; 225 } 226 227 /* Initialize tw9903 */ 228 dec->norm = V4L2_STD_NTSC; 229 230 if (write_regs(sd, initial_registers) < 0) { 231 v4l2_err(client, "error initializing TW9903\n"); 232 return -EINVAL; 233 } 234 235 return 0; 236 } 237 238 static void tw9903_remove(struct i2c_client *client) 239 { 240 struct v4l2_subdev *sd = i2c_get_clientdata(client); 241 242 v4l2_device_unregister_subdev(sd); 243 v4l2_ctrl_handler_free(&to_state(sd)->hdl); 244 } 245 246 /* ----------------------------------------------------------------------- */ 247 248 static const struct i2c_device_id tw9903_id[] = { 249 { "tw9903", 0 }, 250 { } 251 }; 252 MODULE_DEVICE_TABLE(i2c, tw9903_id); 253 254 static struct i2c_driver tw9903_driver = { 255 .driver = { 256 .name = "tw9903", 257 }, 258 .probe = tw9903_probe, 259 .remove = tw9903_remove, 260 .id_table = tw9903_id, 261 }; 262 module_i2c_driver(tw9903_driver); 263