// SPDX-License-Identifier: GPL-2.0-only /* * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM) * * Copyright (C) 2010, Guennadi Liakhovetski */ #include #include #include #include #include #include #include #include #include #define AK881X_INTERFACE_MODE 0 #define AK881X_VIDEO_PROCESS1 1 #define AK881X_VIDEO_PROCESS2 2 #define AK881X_VIDEO_PROCESS3 3 #define AK881X_DAC_MODE 5 #define AK881X_STATUS 0x24 #define AK881X_DEVICE_ID 0x25 #define AK881X_DEVICE_REVISION 0x26 struct ak881x { struct v4l2_subdev subdev; struct ak881x_pdata *pdata; unsigned int lines; char revision; /* DEVICE_REVISION content */ }; static int reg_read(struct i2c_client *client, const u8 reg) { return i2c_smbus_read_byte_data(client, reg); } static int reg_write(struct i2c_client *client, const u8 reg, const u8 data) { return i2c_smbus_write_byte_data(client, reg, data); } static int reg_set(struct i2c_client *client, const u8 reg, const u8 data, u8 mask) { int ret = reg_read(client, reg); if (ret < 0) return ret; return reg_write(client, reg, (ret & ~mask) | (data & mask)); } static struct ak881x *to_ak881x(const struct i2c_client *client) { return container_of(i2c_get_clientdata(client), struct ak881x, subdev); } #ifdef CONFIG_VIDEO_ADV_DEBUG static int ak881x_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) { struct i2c_client *client = v4l2_get_subdevdata(sd); if (reg->reg > 0x26) return -EINVAL; reg->size = 1; reg->val = reg_read(client, reg->reg); if (reg->val > 0xffff) return -EIO; return 0; } static int ak881x_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg) { struct i2c_client *client = v4l2_get_subdevdata(sd); if (reg->reg > 0x26) return -EINVAL; if (reg_write(client, reg->reg, reg->val) < 0) return -EIO; return 0; } #endif static int ak881x_fill_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *sd_state, struct v4l2_subdev_format *format) { struct v4l2_mbus_framefmt *mf = &format->format; struct i2c_client *client = v4l2_get_subdevdata(sd); struct ak881x *ak881x = to_ak881x(client); if (format->pad) return -EINVAL; v4l_bound_align_image(&mf->width, 0, 720, 2, &mf->height, 0, ak881x->lines, 1, 0); mf->field = V4L2_FIELD_INTERLACED; mf->code = MEDIA_BUS_FMT_YUYV8_2X8; mf->colorspace = V4L2_COLORSPACE_SMPTE170M; return 0; } static int ak881x_enum_mbus_code(struct v4l2_subdev *sd, struct v4l2_subdev_state *sd_state, struct v4l2_subdev_mbus_code_enum *code) { if (code->pad || code->index) return -EINVAL; code->code = MEDIA_BUS_FMT_YUYV8_2X8; return 0; } static int ak881x_get_selection(struct v4l2_subdev *sd, struct v4l2_subdev_state *sd_state, struct v4l2_subdev_selection *sel) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct ak881x *ak881x = to_ak881x(client); if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; switch (sel->target) { case V4L2_SEL_TGT_CROP_BOUNDS: sel->r.left = 0; sel->r.top = 0; sel->r.width = 720; sel->r.height = ak881x->lines; return 0; default: return -EINVAL; } } static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct ak881x *ak881x = to_ak881x(client); u8 vp1; if (std == V4L2_STD_NTSC_443) { vp1 = 3; ak881x->lines = 480; } else if (std == V4L2_STD_PAL_M) { vp1 = 5; ak881x->lines = 480; } else if (std == V4L2_STD_PAL_60) { vp1 = 7; ak881x->lines = 480; } else if (std & V4L2_STD_NTSC) { vp1 = 0; ak881x->lines = 480; } else if (std & V4L2_STD_PAL) { vp1 = 0xf; ak881x->lines = 576; } else { /* No SECAM or PAL_N/Nc supported */ return -EINVAL; } reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf); return 0; } static int ak881x_s_stream(struct v4l2_subdev *sd, int enable) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct ak881x *ak881x = to_ak881x(client); if (enable) { u8 dac; /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */ /* Default: composite output */ if (ak881x->pdata->flags & AK881X_COMPONENT) dac = 3; else dac = 4; /* Turn on the DAC(s) */ reg_write(client, AK881X_DAC_MODE, dac); dev_dbg(&client->dev, "chip status 0x%x\n", reg_read(client, AK881X_STATUS)); } else { /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */ reg_write(client, AK881X_DAC_MODE, 0); dev_dbg(&client->dev, "chip status 0x%x\n", reg_read(client, AK881X_STATUS)); } return 0; } static const struct v4l2_subdev_core_ops ak881x_subdev_core_ops = { #ifdef CONFIG_VIDEO_ADV_DEBUG .g_register = ak881x_g_register, .s_register = ak881x_s_register, #endif }; static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = { .s_std_output = ak881x_s_std_output, .s_stream = ak881x_s_stream, }; static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = { .enum_mbus_code = ak881x_enum_mbus_code, .get_selection = ak881x_get_selection, .set_fmt = ak881x_fill_fmt, .get_fmt = ak881x_fill_fmt, }; static const struct v4l2_subdev_ops ak881x_subdev_ops = { .core = &ak881x_subdev_core_ops, .video = &ak881x_subdev_video_ops, .pad = &ak881x_subdev_pad_ops, }; static int ak881x_probe(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; struct ak881x *ak881x; u8 ifmode, data; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_warn(&adapter->dev, "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); return -EIO; } ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL); if (!ak881x) return -ENOMEM; v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops); data = reg_read(client, AK881X_DEVICE_ID); switch (data) { case 0x13: case 0x14: break; default: dev_err(&client->dev, "No ak881x chip detected, register read %x\n", data); return -ENODEV; } ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION); ak881x->pdata = client->dev.platform_data; if (ak881x->pdata) { if (ak881x->pdata->flags & AK881X_FIELD) ifmode = 4; else ifmode = 0; switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) { case AK881X_IF_MODE_BT656: ifmode |= 1; break; case AK881X_IF_MODE_MASTER: ifmode |= 2; break; case AK881X_IF_MODE_SLAVE: default: break; } dev_dbg(&client->dev, "IF mode %x\n", ifmode); /* * "Line Blanking No." seems to be the same as the number of * "black" lines on, e.g., SuperH VOU, whose default value of 20 * "incidentally" matches ak881x' default */ reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3)); } /* Hardware default: NTSC-M */ ak881x->lines = 480; dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n", data, ak881x->revision); return 0; } static void ak881x_remove(struct i2c_client *client) { struct ak881x *ak881x = to_ak881x(client); v4l2_device_unregister_subdev(&ak881x->subdev); } static const struct i2c_device_id ak881x_id[] = { { "ak8813" }, { "ak8814" }, { } }; MODULE_DEVICE_TABLE(i2c, ak881x_id); static struct i2c_driver ak881x_i2c_driver = { .driver = { .name = "ak881x", }, .probe = ak881x_probe, .remove = ak881x_remove, .id_table = ak881x_id, }; module_i2c_driver(ak881x_i2c_driver); MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814"); MODULE_AUTHOR("Guennadi Liakhovetski "); MODULE_LICENSE("GPL v2");