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_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a) 128 { 129 struct i2c_client *client = v4l2_get_subdevdata(sd); 130 struct ak881x *ak881x = to_ak881x(client); 131 132 a->bounds.left = 0; 133 a->bounds.top = 0; 134 a->bounds.width = 720; 135 a->bounds.height = ak881x->lines; 136 a->defrect = a->bounds; 137 a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; 138 a->pixelaspect.numerator = 1; 139 a->pixelaspect.denominator = 1; 140 141 return 0; 142 } 143 144 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) 145 { 146 struct i2c_client *client = v4l2_get_subdevdata(sd); 147 struct ak881x *ak881x = to_ak881x(client); 148 u8 vp1; 149 150 if (std == V4L2_STD_NTSC_443) { 151 vp1 = 3; 152 ak881x->lines = 480; 153 } else if (std == V4L2_STD_PAL_M) { 154 vp1 = 5; 155 ak881x->lines = 480; 156 } else if (std == V4L2_STD_PAL_60) { 157 vp1 = 7; 158 ak881x->lines = 480; 159 } else if (std & V4L2_STD_NTSC) { 160 vp1 = 0; 161 ak881x->lines = 480; 162 } else if (std & V4L2_STD_PAL) { 163 vp1 = 0xf; 164 ak881x->lines = 576; 165 } else { 166 /* No SECAM or PAL_N/Nc supported */ 167 return -EINVAL; 168 } 169 170 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf); 171 172 return 0; 173 } 174 175 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable) 176 { 177 struct i2c_client *client = v4l2_get_subdevdata(sd); 178 struct ak881x *ak881x = to_ak881x(client); 179 180 if (enable) { 181 u8 dac; 182 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */ 183 /* Default: composite output */ 184 if (ak881x->pdata->flags & AK881X_COMPONENT) 185 dac = 3; 186 else 187 dac = 4; 188 /* Turn on the DAC(s) */ 189 reg_write(client, AK881X_DAC_MODE, dac); 190 dev_dbg(&client->dev, "chip status 0x%x\n", 191 reg_read(client, AK881X_STATUS)); 192 } else { 193 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */ 194 reg_write(client, AK881X_DAC_MODE, 0); 195 dev_dbg(&client->dev, "chip status 0x%x\n", 196 reg_read(client, AK881X_STATUS)); 197 } 198 199 return 0; 200 } 201 202 static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = { 203 #ifdef CONFIG_VIDEO_ADV_DEBUG 204 .g_register = ak881x_g_register, 205 .s_register = ak881x_s_register, 206 #endif 207 }; 208 209 static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = { 210 .cropcap = ak881x_cropcap, 211 .s_std_output = ak881x_s_std_output, 212 .s_stream = ak881x_s_stream, 213 }; 214 215 static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = { 216 .enum_mbus_code = ak881x_enum_mbus_code, 217 .set_fmt = ak881x_fill_fmt, 218 .get_fmt = ak881x_fill_fmt, 219 }; 220 221 static struct v4l2_subdev_ops ak881x_subdev_ops = { 222 .core = &ak881x_subdev_core_ops, 223 .video = &ak881x_subdev_video_ops, 224 .pad = &ak881x_subdev_pad_ops, 225 }; 226 227 static int ak881x_probe(struct i2c_client *client, 228 const struct i2c_device_id *did) 229 { 230 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 231 struct ak881x *ak881x; 232 u8 ifmode, data; 233 234 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 235 dev_warn(&adapter->dev, 236 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 237 return -EIO; 238 } 239 240 ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL); 241 if (!ak881x) 242 return -ENOMEM; 243 244 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops); 245 246 data = reg_read(client, AK881X_DEVICE_ID); 247 248 switch (data) { 249 case 0x13: 250 case 0x14: 251 break; 252 default: 253 dev_err(&client->dev, 254 "No ak881x chip detected, register read %x\n", data); 255 return -ENODEV; 256 } 257 258 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION); 259 ak881x->pdata = client->dev.platform_data; 260 261 if (ak881x->pdata) { 262 if (ak881x->pdata->flags & AK881X_FIELD) 263 ifmode = 4; 264 else 265 ifmode = 0; 266 267 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) { 268 case AK881X_IF_MODE_BT656: 269 ifmode |= 1; 270 break; 271 case AK881X_IF_MODE_MASTER: 272 ifmode |= 2; 273 break; 274 case AK881X_IF_MODE_SLAVE: 275 default: 276 break; 277 } 278 279 dev_dbg(&client->dev, "IF mode %x\n", ifmode); 280 281 /* 282 * "Line Blanking No." seems to be the same as the number of 283 * "black" lines on, e.g., SuperH VOU, whose default value of 20 284 * "incidentally" matches ak881x' default 285 */ 286 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3)); 287 } 288 289 /* Hardware default: NTSC-M */ 290 ak881x->lines = 480; 291 292 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n", 293 data, ak881x->revision); 294 295 return 0; 296 } 297 298 static int ak881x_remove(struct i2c_client *client) 299 { 300 struct ak881x *ak881x = to_ak881x(client); 301 302 v4l2_device_unregister_subdev(&ak881x->subdev); 303 304 return 0; 305 } 306 307 static const struct i2c_device_id ak881x_id[] = { 308 { "ak8813", 0 }, 309 { "ak8814", 0 }, 310 { } 311 }; 312 MODULE_DEVICE_TABLE(i2c, ak881x_id); 313 314 static struct i2c_driver ak881x_i2c_driver = { 315 .driver = { 316 .name = "ak881x", 317 }, 318 .probe = ak881x_probe, 319 .remove = ak881x_remove, 320 .id_table = ak881x_id, 321 }; 322 323 module_i2c_driver(ak881x_i2c_driver); 324 325 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814"); 326 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 327 MODULE_LICENSE("GPL v2"); 328