1 // SPDX-License-Identifier: GPL-2.0-only
3 * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
5 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
9 #include <linux/init.h>
10 #include <linux/platform_device.h>
11 #include <linux/slab.h>
12 #include <linux/videodev2.h>
13 #include <linux/module.h>
15 #include <media/i2c/ak881x.h>
16 #include <media/v4l2-common.h>
17 #include <media/v4l2-device.h>
19 #define AK881X_INTERFACE_MODE 0
20 #define AK881X_VIDEO_PROCESS1 1
21 #define AK881X_VIDEO_PROCESS2 2
22 #define AK881X_VIDEO_PROCESS3 3
23 #define AK881X_DAC_MODE 5
24 #define AK881X_STATUS 0x24
25 #define AK881X_DEVICE_ID 0x25
26 #define AK881X_DEVICE_REVISION 0x26
29 struct v4l2_subdev subdev;
30 struct ak881x_pdata *pdata;
32 char revision; /* DEVICE_REVISION content */
35 static int reg_read(struct i2c_client *client, const u8 reg)
37 return i2c_smbus_read_byte_data(client, reg);
40 static int reg_write(struct i2c_client *client, const u8 reg,
43 return i2c_smbus_write_byte_data(client, reg, data);
46 static int reg_set(struct i2c_client *client, const u8 reg,
47 const u8 data, u8 mask)
49 int ret = reg_read(client, reg);
52 return reg_write(client, reg, (ret & ~mask) | (data & mask));
55 static struct ak881x *to_ak881x(const struct i2c_client *client)
57 return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
60 #ifdef CONFIG_VIDEO_ADV_DEBUG
61 static int ak881x_g_register(struct v4l2_subdev *sd,
62 struct v4l2_dbg_register *reg)
64 struct i2c_client *client = v4l2_get_subdevdata(sd);
70 reg->val = reg_read(client, reg->reg);
72 if (reg->val > 0xffff)
78 static int ak881x_s_register(struct v4l2_subdev *sd,
79 const struct v4l2_dbg_register *reg)
81 struct i2c_client *client = v4l2_get_subdevdata(sd);
86 if (reg_write(client, reg->reg, reg->val) < 0)
93 static int ak881x_fill_fmt(struct v4l2_subdev *sd,
94 struct v4l2_subdev_pad_config *cfg,
95 struct v4l2_subdev_format *format)
97 struct v4l2_mbus_framefmt *mf = &format->format;
98 struct i2c_client *client = v4l2_get_subdevdata(sd);
99 struct ak881x *ak881x = to_ak881x(client);
104 v4l_bound_align_image(&mf->width, 0, 720, 2,
105 &mf->height, 0, ak881x->lines, 1, 0);
106 mf->field = V4L2_FIELD_INTERLACED;
107 mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
108 mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
113 static int ak881x_enum_mbus_code(struct v4l2_subdev *sd,
114 struct v4l2_subdev_pad_config *cfg,
115 struct v4l2_subdev_mbus_code_enum *code)
117 if (code->pad || code->index)
120 code->code = MEDIA_BUS_FMT_YUYV8_2X8;
124 static int ak881x_get_selection(struct v4l2_subdev *sd,
125 struct v4l2_subdev_pad_config *cfg,
126 struct v4l2_subdev_selection *sel)
128 struct i2c_client *client = v4l2_get_subdevdata(sd);
129 struct ak881x *ak881x = to_ak881x(client);
131 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
134 switch (sel->target) {
135 case V4L2_SEL_TGT_CROP_BOUNDS:
139 sel->r.height = ak881x->lines;
146 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
148 struct i2c_client *client = v4l2_get_subdevdata(sd);
149 struct ak881x *ak881x = to_ak881x(client);
152 if (std == V4L2_STD_NTSC_443) {
155 } else if (std == V4L2_STD_PAL_M) {
158 } else if (std == V4L2_STD_PAL_60) {
161 } else if (std & V4L2_STD_NTSC) {
164 } else if (std & V4L2_STD_PAL) {
168 /* No SECAM or PAL_N/Nc supported */
172 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
177 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
179 struct i2c_client *client = v4l2_get_subdevdata(sd);
180 struct ak881x *ak881x = to_ak881x(client);
184 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
185 /* Default: composite output */
186 if (ak881x->pdata->flags & AK881X_COMPONENT)
190 /* Turn on the DAC(s) */
191 reg_write(client, AK881X_DAC_MODE, dac);
192 dev_dbg(&client->dev, "chip status 0x%x\n",
193 reg_read(client, AK881X_STATUS));
195 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
196 reg_write(client, AK881X_DAC_MODE, 0);
197 dev_dbg(&client->dev, "chip status 0x%x\n",
198 reg_read(client, AK881X_STATUS));
204 static const struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
205 #ifdef CONFIG_VIDEO_ADV_DEBUG
206 .g_register = ak881x_g_register,
207 .s_register = ak881x_s_register,
211 static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
212 .s_std_output = ak881x_s_std_output,
213 .s_stream = ak881x_s_stream,
216 static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = {
217 .enum_mbus_code = ak881x_enum_mbus_code,
218 .get_selection = ak881x_get_selection,
219 .set_fmt = ak881x_fill_fmt,
220 .get_fmt = ak881x_fill_fmt,
223 static const struct v4l2_subdev_ops ak881x_subdev_ops = {
224 .core = &ak881x_subdev_core_ops,
225 .video = &ak881x_subdev_video_ops,
226 .pad = &ak881x_subdev_pad_ops,
229 static int ak881x_probe(struct i2c_client *client,
230 const struct i2c_device_id *did)
232 struct i2c_adapter *adapter = client->adapter;
233 struct ak881x *ak881x;
236 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
237 dev_warn(&adapter->dev,
238 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
242 ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL);
246 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
248 data = reg_read(client, AK881X_DEVICE_ID);
255 dev_err(&client->dev,
256 "No ak881x chip detected, register read %x\n", data);
260 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
261 ak881x->pdata = client->dev.platform_data;
264 if (ak881x->pdata->flags & AK881X_FIELD)
269 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
270 case AK881X_IF_MODE_BT656:
273 case AK881X_IF_MODE_MASTER:
276 case AK881X_IF_MODE_SLAVE:
281 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
284 * "Line Blanking No." seems to be the same as the number of
285 * "black" lines on, e.g., SuperH VOU, whose default value of 20
286 * "incidentally" matches ak881x' default
288 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
291 /* Hardware default: NTSC-M */
294 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
295 data, ak881x->revision);
300 static int ak881x_remove(struct i2c_client *client)
302 struct ak881x *ak881x = to_ak881x(client);
304 v4l2_device_unregister_subdev(&ak881x->subdev);
309 static const struct i2c_device_id ak881x_id[] = {
314 MODULE_DEVICE_TABLE(i2c, ak881x_id);
316 static struct i2c_driver ak881x_i2c_driver = {
320 .probe = ak881x_probe,
321 .remove = ak881x_remove,
322 .id_table = ak881x_id,
325 module_i2c_driver(ak881x_i2c_driver);
327 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
328 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
329 MODULE_LICENSE("GPL v2");