1 /* 2 * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM) 3 * 4 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/i2c.h> 12 #include <linux/init.h> 13 #include <linux/platform_device.h> 14 #include <linux/slab.h> 15 #include <linux/videodev2.h> 16 #include <linux/module.h> 17 18 #include <media/i2c/ak881x.h> 19 #include <media/v4l2-common.h> 20 #include <media/v4l2-device.h> 21 22 #define AK881X_INTERFACE_MODE 0 23 #define AK881X_VIDEO_PROCESS1 1 24 #define AK881X_VIDEO_PROCESS2 2 25 #define AK881X_VIDEO_PROCESS3 3 26 #define AK881X_DAC_MODE 5 27 #define AK881X_STATUS 0x24 28 #define AK881X_DEVICE_ID 0x25 29 #define AK881X_DEVICE_REVISION 0x26 30 31 struct ak881x { 32 struct v4l2_subdev subdev; 33 struct ak881x_pdata *pdata; 34 unsigned int lines; 35 char revision; /* DEVICE_REVISION content */ 36 }; 37 38 static int reg_read(struct i2c_client *client, const u8 reg) 39 { 40 return i2c_smbus_read_byte_data(client, reg); 41 } 42 43 static int reg_write(struct i2c_client *client, const u8 reg, 44 const u8 data) 45 { 46 return i2c_smbus_write_byte_data(client, reg, data); 47 } 48 49 static int reg_set(struct i2c_client *client, const u8 reg, 50 const u8 data, u8 mask) 51 { 52 int ret = reg_read(client, reg); 53 if (ret < 0) 54 return ret; 55 return reg_write(client, reg, (ret & ~mask) | (data & mask)); 56 } 57 58 static struct ak881x *to_ak881x(const struct i2c_client *client) 59 { 60 return container_of(i2c_get_clientdata(client), struct ak881x, subdev); 61 } 62 63 #ifdef CONFIG_VIDEO_ADV_DEBUG 64 static int ak881x_g_register(struct v4l2_subdev *sd, 65 struct v4l2_dbg_register *reg) 66 { 67 struct i2c_client *client = v4l2_get_subdevdata(sd); 68 69 if (reg->reg > 0x26) 70 return -EINVAL; 71 72 reg->size = 1; 73 reg->val = reg_read(client, reg->reg); 74 75 if (reg->val > 0xffff) 76 return -EIO; 77 78 return 0; 79 } 80 81 static int ak881x_s_register(struct v4l2_subdev *sd, 82 const struct v4l2_dbg_register *reg) 83 { 84 struct i2c_client *client = v4l2_get_subdevdata(sd); 85 86 if (reg->reg > 0x26) 87 return -EINVAL; 88 89 if (reg_write(client, reg->reg, reg->val) < 0) 90 return -EIO; 91 92 return 0; 93 } 94 #endif 95 96 static int ak881x_fill_fmt(struct v4l2_subdev *sd, 97 struct v4l2_subdev_pad_config *cfg, 98 struct v4l2_subdev_format *format) 99 { 100 struct v4l2_mbus_framefmt *mf = &format->format; 101 struct i2c_client *client = v4l2_get_subdevdata(sd); 102 struct ak881x *ak881x = to_ak881x(client); 103 104 if (format->pad) 105 return -EINVAL; 106 107 v4l_bound_align_image(&mf->width, 0, 720, 2, 108 &mf->height, 0, ak881x->lines, 1, 0); 109 mf->field = V4L2_FIELD_INTERLACED; 110 mf->code = MEDIA_BUS_FMT_YUYV8_2X8; 111 mf->colorspace = V4L2_COLORSPACE_SMPTE170M; 112 113 return 0; 114 } 115 116 static int ak881x_enum_mbus_code(struct v4l2_subdev *sd, 117 struct v4l2_subdev_pad_config *cfg, 118 struct v4l2_subdev_mbus_code_enum *code) 119 { 120 if (code->pad || code->index) 121 return -EINVAL; 122 123 code->code = MEDIA_BUS_FMT_YUYV8_2X8; 124 return 0; 125 } 126 127 static int ak881x_get_selection(struct v4l2_subdev *sd, 128 struct v4l2_subdev_pad_config *cfg, 129 struct v4l2_subdev_selection *sel) 130 { 131 struct i2c_client *client = v4l2_get_subdevdata(sd); 132 struct ak881x *ak881x = to_ak881x(client); 133 134 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) 135 return -EINVAL; 136 137 switch (sel->target) { 138 case V4L2_SEL_TGT_CROP_BOUNDS: 139 sel->r.left = 0; 140 sel->r.top = 0; 141 sel->r.width = 720; 142 sel->r.height = ak881x->lines; 143 return 0; 144 default: 145 return -EINVAL; 146 } 147 } 148 149 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) 150 { 151 struct i2c_client *client = v4l2_get_subdevdata(sd); 152 struct ak881x *ak881x = to_ak881x(client); 153 u8 vp1; 154 155 if (std == V4L2_STD_NTSC_443) { 156 vp1 = 3; 157 ak881x->lines = 480; 158 } else if (std == V4L2_STD_PAL_M) { 159 vp1 = 5; 160 ak881x->lines = 480; 161 } else if (std == V4L2_STD_PAL_60) { 162 vp1 = 7; 163 ak881x->lines = 480; 164 } else if (std & V4L2_STD_NTSC) { 165 vp1 = 0; 166 ak881x->lines = 480; 167 } else if (std & V4L2_STD_PAL) { 168 vp1 = 0xf; 169 ak881x->lines = 576; 170 } else { 171 /* No SECAM or PAL_N/Nc supported */ 172 return -EINVAL; 173 } 174 175 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf); 176 177 return 0; 178 } 179 180 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable) 181 { 182 struct i2c_client *client = v4l2_get_subdevdata(sd); 183 struct ak881x *ak881x = to_ak881x(client); 184 185 if (enable) { 186 u8 dac; 187 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */ 188 /* Default: composite output */ 189 if (ak881x->pdata->flags & AK881X_COMPONENT) 190 dac = 3; 191 else 192 dac = 4; 193 /* Turn on the DAC(s) */ 194 reg_write(client, AK881X_DAC_MODE, dac); 195 dev_dbg(&client->dev, "chip status 0x%x\n", 196 reg_read(client, AK881X_STATUS)); 197 } else { 198 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */ 199 reg_write(client, AK881X_DAC_MODE, 0); 200 dev_dbg(&client->dev, "chip status 0x%x\n", 201 reg_read(client, AK881X_STATUS)); 202 } 203 204 return 0; 205 } 206 207 static const struct v4l2_subdev_core_ops ak881x_subdev_core_ops = { 208 #ifdef CONFIG_VIDEO_ADV_DEBUG 209 .g_register = ak881x_g_register, 210 .s_register = ak881x_s_register, 211 #endif 212 }; 213 214 static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = { 215 .s_std_output = ak881x_s_std_output, 216 .s_stream = ak881x_s_stream, 217 }; 218 219 static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = { 220 .enum_mbus_code = ak881x_enum_mbus_code, 221 .get_selection = ak881x_get_selection, 222 .set_fmt = ak881x_fill_fmt, 223 .get_fmt = ak881x_fill_fmt, 224 }; 225 226 static const struct v4l2_subdev_ops ak881x_subdev_ops = { 227 .core = &ak881x_subdev_core_ops, 228 .video = &ak881x_subdev_video_ops, 229 .pad = &ak881x_subdev_pad_ops, 230 }; 231 232 static int ak881x_probe(struct i2c_client *client, 233 const struct i2c_device_id *did) 234 { 235 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 236 struct ak881x *ak881x; 237 u8 ifmode, data; 238 239 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 240 dev_warn(&adapter->dev, 241 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 242 return -EIO; 243 } 244 245 ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL); 246 if (!ak881x) 247 return -ENOMEM; 248 249 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops); 250 251 data = reg_read(client, AK881X_DEVICE_ID); 252 253 switch (data) { 254 case 0x13: 255 case 0x14: 256 break; 257 default: 258 dev_err(&client->dev, 259 "No ak881x chip detected, register read %x\n", data); 260 return -ENODEV; 261 } 262 263 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION); 264 ak881x->pdata = client->dev.platform_data; 265 266 if (ak881x->pdata) { 267 if (ak881x->pdata->flags & AK881X_FIELD) 268 ifmode = 4; 269 else 270 ifmode = 0; 271 272 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) { 273 case AK881X_IF_MODE_BT656: 274 ifmode |= 1; 275 break; 276 case AK881X_IF_MODE_MASTER: 277 ifmode |= 2; 278 break; 279 case AK881X_IF_MODE_SLAVE: 280 default: 281 break; 282 } 283 284 dev_dbg(&client->dev, "IF mode %x\n", ifmode); 285 286 /* 287 * "Line Blanking No." seems to be the same as the number of 288 * "black" lines on, e.g., SuperH VOU, whose default value of 20 289 * "incidentally" matches ak881x' default 290 */ 291 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3)); 292 } 293 294 /* Hardware default: NTSC-M */ 295 ak881x->lines = 480; 296 297 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n", 298 data, ak881x->revision); 299 300 return 0; 301 } 302 303 static int ak881x_remove(struct i2c_client *client) 304 { 305 struct ak881x *ak881x = to_ak881x(client); 306 307 v4l2_device_unregister_subdev(&ak881x->subdev); 308 309 return 0; 310 } 311 312 static const struct i2c_device_id ak881x_id[] = { 313 { "ak8813", 0 }, 314 { "ak8814", 0 }, 315 { } 316 }; 317 MODULE_DEVICE_TABLE(i2c, ak881x_id); 318 319 static struct i2c_driver ak881x_i2c_driver = { 320 .driver = { 321 .name = "ak881x", 322 }, 323 .probe = ak881x_probe, 324 .remove = ak881x_remove, 325 .id_table = ak881x_id, 326 }; 327 328 module_i2c_driver(ak881x_i2c_driver); 329 330 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814"); 331 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 332 MODULE_LICENSE("GPL v2"); 333