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/videodev2.h>
16 #include <media/ak881x.h>
17 #include <media/v4l2-chip-ident.h>
18 #include <media/v4l2-common.h>
19 #include <media/v4l2-device.h>
21 #define AK881X_INTERFACE_MODE 0
22 #define AK881X_VIDEO_PROCESS1 1
23 #define AK881X_VIDEO_PROCESS2 2
24 #define AK881X_VIDEO_PROCESS3 3
25 #define AK881X_DAC_MODE 5
26 #define AK881X_STATUS 0x24
27 #define AK881X_DEVICE_ID 0x25
28 #define AK881X_DEVICE_REVISION 0x26
31 struct v4l2_subdev subdev;
32 struct ak881x_pdata *pdata;
34 int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
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 static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
64 struct v4l2_dbg_chip_ident *id)
66 struct i2c_client *client = v4l2_get_subdevdata(sd);
67 struct ak881x *ak881x = to_ak881x(client);
69 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
72 if (id->match.addr != client->addr)
75 id->ident = ak881x->id;
76 id->revision = ak881x->revision;
81 #ifdef CONFIG_VIDEO_ADV_DEBUG
82 static int ak881x_g_register(struct v4l2_subdev *sd,
83 struct v4l2_dbg_register *reg)
85 struct i2c_client *client = v4l2_get_subdevdata(sd);
87 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
90 if (reg->match.addr != client->addr)
93 reg->val = reg_read(client, reg->reg);
95 if (reg->val > 0xffff)
101 static int ak881x_s_register(struct v4l2_subdev *sd,
102 struct v4l2_dbg_register *reg)
104 struct i2c_client *client = v4l2_get_subdevdata(sd);
106 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
109 if (reg->match.addr != client->addr)
112 if (reg_write(client, reg->reg, reg->val) < 0)
119 static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
120 struct v4l2_mbus_framefmt *mf)
122 struct i2c_client *client = v4l2_get_subdevdata(sd);
123 struct ak881x *ak881x = to_ak881x(client);
125 v4l_bound_align_image(&mf->width, 0, 720, 2,
126 &mf->height, 0, ak881x->lines, 1, 0);
127 mf->field = V4L2_FIELD_INTERLACED;
128 mf->code = V4L2_MBUS_FMT_YUYV8_2X8_LE;
129 mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
134 static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
135 struct v4l2_mbus_framefmt *mf)
137 if (mf->field != V4L2_FIELD_INTERLACED ||
138 mf->code != V4L2_MBUS_FMT_YUYV8_2X8_LE)
141 return ak881x_try_g_mbus_fmt(sd, mf);
144 static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
145 enum v4l2_mbus_pixelcode *code)
150 *code = V4L2_MBUS_FMT_YUYV8_2X8_LE;
154 static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
156 struct i2c_client *client = v4l2_get_subdevdata(sd);
157 struct ak881x *ak881x = to_ak881x(client);
161 a->bounds.width = 720;
162 a->bounds.height = ak881x->lines;
163 a->defrect = a->bounds;
164 a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
165 a->pixelaspect.numerator = 1;
166 a->pixelaspect.denominator = 1;
171 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
173 struct i2c_client *client = v4l2_get_subdevdata(sd);
174 struct ak881x *ak881x = to_ak881x(client);
177 if (std == V4L2_STD_NTSC_443) {
180 } else if (std == V4L2_STD_PAL_M) {
183 } else if (std == V4L2_STD_PAL_60) {
186 } else if (std && !(std & ~V4L2_STD_PAL)) {
189 } else if (std && !(std & ~V4L2_STD_NTSC)) {
193 /* No SECAM or PAL_N/Nc supported */
197 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
202 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
204 struct i2c_client *client = v4l2_get_subdevdata(sd);
205 struct ak881x *ak881x = to_ak881x(client);
209 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
210 /* Default: composite output */
211 if (ak881x->pdata->flags & AK881X_COMPONENT)
215 /* Turn on the DAC(s) */
216 reg_write(client, AK881X_DAC_MODE, dac);
217 dev_dbg(&client->dev, "chip status 0x%x\n",
218 reg_read(client, AK881X_STATUS));
220 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
221 reg_write(client, AK881X_DAC_MODE, 0);
222 dev_dbg(&client->dev, "chip status 0x%x\n",
223 reg_read(client, AK881X_STATUS));
229 static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
230 .g_chip_ident = ak881x_g_chip_ident,
231 #ifdef CONFIG_VIDEO_ADV_DEBUG
232 .g_register = ak881x_g_register,
233 .s_register = ak881x_s_register,
237 static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
238 .s_mbus_fmt = ak881x_s_mbus_fmt,
239 .g_mbus_fmt = ak881x_try_g_mbus_fmt,
240 .try_mbus_fmt = ak881x_try_g_mbus_fmt,
241 .cropcap = ak881x_cropcap,
242 .enum_mbus_fmt = ak881x_enum_mbus_fmt,
243 .s_std_output = ak881x_s_std_output,
244 .s_stream = ak881x_s_stream,
247 static struct v4l2_subdev_ops ak881x_subdev_ops = {
248 .core = &ak881x_subdev_core_ops,
249 .video = &ak881x_subdev_video_ops,
252 static int ak881x_probe(struct i2c_client *client,
253 const struct i2c_device_id *did)
255 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
256 struct ak881x *ak881x;
259 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
260 dev_warn(&adapter->dev,
261 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
265 ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
269 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
271 data = reg_read(client, AK881X_DEVICE_ID);
275 ak881x->id = V4L2_IDENT_AK8813;
278 ak881x->id = V4L2_IDENT_AK8814;
281 dev_err(&client->dev,
282 "No ak881x chip detected, register read %x\n", data);
287 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
288 ak881x->pdata = client->dev.platform_data;
291 if (ak881x->pdata->flags & AK881X_FIELD)
296 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
297 case AK881X_IF_MODE_BT656:
300 case AK881X_IF_MODE_MASTER:
303 case AK881X_IF_MODE_SLAVE:
308 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
311 * "Line Blanking No." seems to be the same as the number of
312 * "black" lines on, e.g., SuperH VOU, whose default value of 20
313 * "incidentally" matches ak881x' default
315 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
318 /* Hardware default: NTSC-M */
321 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
322 data, ak881x->revision);
327 static int ak881x_remove(struct i2c_client *client)
329 struct ak881x *ak881x = to_ak881x(client);
331 v4l2_device_unregister_subdev(&ak881x->subdev);
337 static const struct i2c_device_id ak881x_id[] = {
342 MODULE_DEVICE_TABLE(i2c, ak881x_id);
344 static struct i2c_driver ak881x_i2c_driver = {
348 .probe = ak881x_probe,
349 .remove = ak881x_remove,
350 .id_table = ak881x_id,
353 static int __init ak881x_module_init(void)
355 return i2c_add_driver(&ak881x_i2c_driver);
358 static void __exit ak881x_module_exit(void)
360 i2c_del_driver(&ak881x_i2c_driver);
363 module_init(ak881x_module_init);
364 module_exit(ak881x_module_exit);
366 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
367 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
368 MODULE_LICENSE("GPL v2");