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 case V4L2_SEL_TGT_CROP_DEFAULT: 140 sel->r.left = 0; 141 sel->r.top = 0; 142 sel->r.width = 720; 143 sel->r.height = ak881x->lines; 144 return 0; 145 default: 146 return -EINVAL; 147 } 148 } 149 150 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) 151 { 152 struct i2c_client *client = v4l2_get_subdevdata(sd); 153 struct ak881x *ak881x = to_ak881x(client); 154 u8 vp1; 155 156 if (std == V4L2_STD_NTSC_443) { 157 vp1 = 3; 158 ak881x->lines = 480; 159 } else if (std == V4L2_STD_PAL_M) { 160 vp1 = 5; 161 ak881x->lines = 480; 162 } else if (std == V4L2_STD_PAL_60) { 163 vp1 = 7; 164 ak881x->lines = 480; 165 } else if (std & V4L2_STD_NTSC) { 166 vp1 = 0; 167 ak881x->lines = 480; 168 } else if (std & V4L2_STD_PAL) { 169 vp1 = 0xf; 170 ak881x->lines = 576; 171 } else { 172 /* No SECAM or PAL_N/Nc supported */ 173 return -EINVAL; 174 } 175 176 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf); 177 178 return 0; 179 } 180 181 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable) 182 { 183 struct i2c_client *client = v4l2_get_subdevdata(sd); 184 struct ak881x *ak881x = to_ak881x(client); 185 186 if (enable) { 187 u8 dac; 188 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */ 189 /* Default: composite output */ 190 if (ak881x->pdata->flags & AK881X_COMPONENT) 191 dac = 3; 192 else 193 dac = 4; 194 /* Turn on the DAC(s) */ 195 reg_write(client, AK881X_DAC_MODE, dac); 196 dev_dbg(&client->dev, "chip status 0x%x\n", 197 reg_read(client, AK881X_STATUS)); 198 } else { 199 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */ 200 reg_write(client, AK881X_DAC_MODE, 0); 201 dev_dbg(&client->dev, "chip status 0x%x\n", 202 reg_read(client, AK881X_STATUS)); 203 } 204 205 return 0; 206 } 207 208 static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = { 209 #ifdef CONFIG_VIDEO_ADV_DEBUG 210 .g_register = ak881x_g_register, 211 .s_register = ak881x_s_register, 212 #endif 213 }; 214 215 static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = { 216 .s_std_output = ak881x_s_std_output, 217 .s_stream = ak881x_s_stream, 218 }; 219 220 static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = { 221 .enum_mbus_code = ak881x_enum_mbus_code, 222 .get_selection = ak881x_get_selection, 223 .set_fmt = ak881x_fill_fmt, 224 .get_fmt = ak881x_fill_fmt, 225 }; 226 227 static struct v4l2_subdev_ops ak881x_subdev_ops = { 228 .core = &ak881x_subdev_core_ops, 229 .video = &ak881x_subdev_video_ops, 230 .pad = &ak881x_subdev_pad_ops, 231 }; 232 233 static int ak881x_probe(struct i2c_client *client, 234 const struct i2c_device_id *did) 235 { 236 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 237 struct ak881x *ak881x; 238 u8 ifmode, data; 239 240 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 241 dev_warn(&adapter->dev, 242 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 243 return -EIO; 244 } 245 246 ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL); 247 if (!ak881x) 248 return -ENOMEM; 249 250 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops); 251 252 data = reg_read(client, AK881X_DEVICE_ID); 253 254 switch (data) { 255 case 0x13: 256 case 0x14: 257 break; 258 default: 259 dev_err(&client->dev, 260 "No ak881x chip detected, register read %x\n", data); 261 return -ENODEV; 262 } 263 264 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION); 265 ak881x->pdata = client->dev.platform_data; 266 267 if (ak881x->pdata) { 268 if (ak881x->pdata->flags & AK881X_FIELD) 269 ifmode = 4; 270 else 271 ifmode = 0; 272 273 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) { 274 case AK881X_IF_MODE_BT656: 275 ifmode |= 1; 276 break; 277 case AK881X_IF_MODE_MASTER: 278 ifmode |= 2; 279 break; 280 case AK881X_IF_MODE_SLAVE: 281 default: 282 break; 283 } 284 285 dev_dbg(&client->dev, "IF mode %x\n", ifmode); 286 287 /* 288 * "Line Blanking No." seems to be the same as the number of 289 * "black" lines on, e.g., SuperH VOU, whose default value of 20 290 * "incidentally" matches ak881x' default 291 */ 292 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3)); 293 } 294 295 /* Hardware default: NTSC-M */ 296 ak881x->lines = 480; 297 298 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n", 299 data, ak881x->revision); 300 301 return 0; 302 } 303 304 static int ak881x_remove(struct i2c_client *client) 305 { 306 struct ak881x *ak881x = to_ak881x(client); 307 308 v4l2_device_unregister_subdev(&ak881x->subdev); 309 310 return 0; 311 } 312 313 static const struct i2c_device_id ak881x_id[] = { 314 { "ak8813", 0 }, 315 { "ak8814", 0 }, 316 { } 317 }; 318 MODULE_DEVICE_TABLE(i2c, ak881x_id); 319 320 static struct i2c_driver ak881x_i2c_driver = { 321 .driver = { 322 .name = "ak881x", 323 }, 324 .probe = ak881x_probe, 325 .remove = ak881x_remove, 326 .id_table = ak881x_id, 327 }; 328 329 module_i2c_driver(ak881x_i2c_driver); 330 331 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814"); 332 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 333 MODULE_LICENSE("GPL v2"); 334