2 * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
4 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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.
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>
18 #include <media/i2c/ak881x.h>
19 #include <media/v4l2-common.h>
20 #include <media/v4l2-device.h>
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
32 struct v4l2_subdev subdev;
33 struct ak881x_pdata *pdata;
35 char revision; /* DEVICE_REVISION content */
38 static int reg_read(struct i2c_client *client, const u8 reg)
40 return i2c_smbus_read_byte_data(client, reg);
43 static int reg_write(struct i2c_client *client, const u8 reg,
46 return i2c_smbus_write_byte_data(client, reg, data);
49 static int reg_set(struct i2c_client *client, const u8 reg,
50 const u8 data, u8 mask)
52 int ret = reg_read(client, reg);
55 return reg_write(client, reg, (ret & ~mask) | (data & mask));
58 static struct ak881x *to_ak881x(const struct i2c_client *client)
60 return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
63 #ifdef CONFIG_VIDEO_ADV_DEBUG
64 static int ak881x_g_register(struct v4l2_subdev *sd,
65 struct v4l2_dbg_register *reg)
67 struct i2c_client *client = v4l2_get_subdevdata(sd);
73 reg->val = reg_read(client, reg->reg);
75 if (reg->val > 0xffff)
81 static int ak881x_s_register(struct v4l2_subdev *sd,
82 const struct v4l2_dbg_register *reg)
84 struct i2c_client *client = v4l2_get_subdevdata(sd);
89 if (reg_write(client, reg->reg, reg->val) < 0)
96 static int ak881x_fill_fmt(struct v4l2_subdev *sd,
97 struct v4l2_subdev_pad_config *cfg,
98 struct v4l2_subdev_format *format)
100 struct v4l2_mbus_framefmt *mf = &format->format;
101 struct i2c_client *client = v4l2_get_subdevdata(sd);
102 struct ak881x *ak881x = to_ak881x(client);
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;
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)
120 if (code->pad || code->index)
123 code->code = MEDIA_BUS_FMT_YUYV8_2X8;
127 static int ak881x_get_selection(struct v4l2_subdev *sd,
128 struct v4l2_subdev_pad_config *cfg,
129 struct v4l2_subdev_selection *sel)
131 struct i2c_client *client = v4l2_get_subdevdata(sd);
132 struct ak881x *ak881x = to_ak881x(client);
134 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
137 switch (sel->target) {
138 case V4L2_SEL_TGT_CROP_BOUNDS:
139 case V4L2_SEL_TGT_CROP_DEFAULT:
143 sel->r.height = ak881x->lines;
150 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
152 struct i2c_client *client = v4l2_get_subdevdata(sd);
153 struct ak881x *ak881x = to_ak881x(client);
156 if (std == V4L2_STD_NTSC_443) {
159 } else if (std == V4L2_STD_PAL_M) {
162 } else if (std == V4L2_STD_PAL_60) {
165 } else if (std & V4L2_STD_NTSC) {
168 } else if (std & V4L2_STD_PAL) {
172 /* No SECAM or PAL_N/Nc supported */
176 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
181 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
183 struct i2c_client *client = v4l2_get_subdevdata(sd);
184 struct ak881x *ak881x = to_ak881x(client);
188 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
189 /* Default: composite output */
190 if (ak881x->pdata->flags & AK881X_COMPONENT)
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));
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));
208 static const 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,
215 static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
216 .s_std_output = ak881x_s_std_output,
217 .s_stream = ak881x_s_stream,
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,
227 static const 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,
233 static int ak881x_probe(struct i2c_client *client,
234 const struct i2c_device_id *did)
236 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
237 struct ak881x *ak881x;
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");
246 ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL);
250 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
252 data = reg_read(client, AK881X_DEVICE_ID);
259 dev_err(&client->dev,
260 "No ak881x chip detected, register read %x\n", data);
264 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
265 ak881x->pdata = client->dev.platform_data;
268 if (ak881x->pdata->flags & AK881X_FIELD)
273 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
274 case AK881X_IF_MODE_BT656:
277 case AK881X_IF_MODE_MASTER:
280 case AK881X_IF_MODE_SLAVE:
285 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
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
292 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
295 /* Hardware default: NTSC-M */
298 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
299 data, ak881x->revision);
304 static int ak881x_remove(struct i2c_client *client)
306 struct ak881x *ak881x = to_ak881x(client);
308 v4l2_device_unregister_subdev(&ak881x->subdev);
313 static const struct i2c_device_id ak881x_id[] = {
318 MODULE_DEVICE_TABLE(i2c, ak881x_id);
320 static struct i2c_driver ak881x_i2c_driver = {
324 .probe = ak881x_probe,
325 .remove = ak881x_remove,
326 .id_table = ak881x_id,
329 module_i2c_driver(ak881x_i2c_driver);
331 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
332 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
333 MODULE_LICENSE("GPL v2");