diff options
Diffstat (limited to 'drivers/media/i2c/ak881x.c')
| -rw-r--r-- | drivers/media/i2c/ak881x.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/drivers/media/i2c/ak881x.c b/drivers/media/i2c/ak881x.c new file mode 100644 index 0000000000..ce840adc2a --- /dev/null +++ b/drivers/media/i2c/ak881x.c @@ -0,0 +1,326 @@ +// 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 <g.liakhovetski@gmx.de> + */ + +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/videodev2.h> +#include <linux/module.h> + +#include <media/i2c/ak881x.h> +#include <media/v4l2-common.h> +#include <media/v4l2-device.h> + +#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", 0 }, + { "ak8814", 0 }, + { } +}; +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 <g.liakhovetski@gmx.de>"); +MODULE_LICENSE("GPL v2"); |