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>
17 #include <media/ak881x.h>
18 #include <media/v4l2-chip-ident.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 int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
36 char revision; /* DEVICE_REVISION content */
39 static int reg_read(struct i2c_client *client, const u8 reg)
41 return i2c_smbus_read_byte_data(client, reg);
44 static int reg_write(struct i2c_client *client, const u8 reg,
47 return i2c_smbus_write_byte_data(client, reg, data);
50 static int reg_set(struct i2c_client *client, const u8 reg,
51 const u8 data, u8 mask)
53 int ret = reg_read(client, reg);
56 return reg_write(client, reg, (ret & ~mask) | (data & mask));
59 static struct ak881x *to_ak881x(const struct i2c_client *client)
61 return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
64 static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
65 struct v4l2_dbg_chip_ident *id)
67 struct i2c_client *client = v4l2_get_subdevdata(sd);
68 struct ak881x *ak881x = to_ak881x(client);
70 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
73 if (id->match.addr != client->addr)
76 id->ident = ak881x->id;
77 id->revision = ak881x->revision;
82 #ifdef CONFIG_VIDEO_ADV_DEBUG
83 static int ak881x_g_register(struct v4l2_subdev *sd,
84 struct v4l2_dbg_register *reg)
86 struct i2c_client *client = v4l2_get_subdevdata(sd);
88 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
91 if (reg->match.addr != client->addr)
94 reg->val = reg_read(client, reg->reg);
96 if (reg->val > 0xffff)
102 static int ak881x_s_register(struct v4l2_subdev *sd,
103 struct v4l2_dbg_register *reg)
105 struct i2c_client *client = v4l2_get_subdevdata(sd);
107 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
110 if (reg->match.addr != client->addr)
113 if (reg_write(client, reg->reg, reg->val) < 0)
120 static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
121 struct v4l2_mbus_framefmt *mf)
123 struct i2c_client *client = v4l2_get_subdevdata(sd);
124 struct ak881x *ak881x = to_ak881x(client);
126 v4l_bound_align_image(&mf->width, 0, 720, 2,
127 &mf->height, 0, ak881x->lines, 1, 0);
128 mf->field = V4L2_FIELD_INTERLACED;
129 mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
130 mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
135 static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
136 struct v4l2_mbus_framefmt *mf)
138 if (mf->field != V4L2_FIELD_INTERLACED ||
139 mf->code != V4L2_MBUS_FMT_YUYV8_2X8)
142 return ak881x_try_g_mbus_fmt(sd, mf);
145 static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
146 enum v4l2_mbus_pixelcode *code)
151 *code = V4L2_MBUS_FMT_YUYV8_2X8;
155 static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
157 struct i2c_client *client = v4l2_get_subdevdata(sd);
158 struct ak881x *ak881x = to_ak881x(client);
162 a->bounds.width = 720;
163 a->bounds.height = ak881x->lines;
164 a->defrect = a->bounds;
165 a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
166 a->pixelaspect.numerator = 1;
167 a->pixelaspect.denominator = 1;
172 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
174 struct i2c_client *client = v4l2_get_subdevdata(sd);
175 struct ak881x *ak881x = to_ak881x(client);
178 if (std == V4L2_STD_NTSC_443) {
181 } else if (std == V4L2_STD_PAL_M) {
184 } else if (std == V4L2_STD_PAL_60) {
187 } else if (std && !(std & ~V4L2_STD_PAL)) {
190 } else if (std && !(std & ~V4L2_STD_NTSC)) {
194 /* No SECAM or PAL_N/Nc supported */
198 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
203 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
205 struct i2c_client *client = v4l2_get_subdevdata(sd);
206 struct ak881x *ak881x = to_ak881x(client);
210 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
211 /* Default: composite output */
212 if (ak881x->pdata->flags & AK881X_COMPONENT)
216 /* Turn on the DAC(s) */
217 reg_write(client, AK881X_DAC_MODE, dac);
218 dev_dbg(&client->dev, "chip status 0x%x\n",
219 reg_read(client, AK881X_STATUS));
221 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
222 reg_write(client, AK881X_DAC_MODE, 0);
223 dev_dbg(&client->dev, "chip status 0x%x\n",
224 reg_read(client, AK881X_STATUS));
230 static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
231 .g_chip_ident = ak881x_g_chip_ident,
232 #ifdef CONFIG_VIDEO_ADV_DEBUG
233 .g_register = ak881x_g_register,
234 .s_register = ak881x_s_register,
238 static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
239 .s_mbus_fmt = ak881x_s_mbus_fmt,
240 .g_mbus_fmt = ak881x_try_g_mbus_fmt,
241 .try_mbus_fmt = ak881x_try_g_mbus_fmt,
242 .cropcap = ak881x_cropcap,
243 .enum_mbus_fmt = ak881x_enum_mbus_fmt,
244 .s_std_output = ak881x_s_std_output,
245 .s_stream = ak881x_s_stream,
248 static struct v4l2_subdev_ops ak881x_subdev_ops = {
249 .core = &ak881x_subdev_core_ops,
250 .video = &ak881x_subdev_video_ops,
253 static int ak881x_probe(struct i2c_client *client,
254 const struct i2c_device_id *did)
256 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
257 struct ak881x *ak881x;
260 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
261 dev_warn(&adapter->dev,
262 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
266 ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
270 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
272 data = reg_read(client, AK881X_DEVICE_ID);
276 ak881x->id = V4L2_IDENT_AK8813;
279 ak881x->id = V4L2_IDENT_AK8814;
282 dev_err(&client->dev,
283 "No ak881x chip detected, register read %x\n", data);
288 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
289 ak881x->pdata = client->dev.platform_data;
292 if (ak881x->pdata->flags & AK881X_FIELD)
297 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
298 case AK881X_IF_MODE_BT656:
301 case AK881X_IF_MODE_MASTER:
304 case AK881X_IF_MODE_SLAVE:
309 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
312 * "Line Blanking No." seems to be the same as the number of
313 * "black" lines on, e.g., SuperH VOU, whose default value of 20
314 * "incidentally" matches ak881x' default
316 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
319 /* Hardware default: NTSC-M */
322 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
323 data, ak881x->revision);
328 static int ak881x_remove(struct i2c_client *client)
330 struct ak881x *ak881x = to_ak881x(client);
332 v4l2_device_unregister_subdev(&ak881x->subdev);
338 static const struct i2c_device_id ak881x_id[] = {
343 MODULE_DEVICE_TABLE(i2c, ak881x_id);
345 static struct i2c_driver ak881x_i2c_driver = {
349 .probe = ak881x_probe,
350 .remove = ak881x_remove,
351 .id_table = ak881x_id,
354 static int __init ak881x_module_init(void)
356 return i2c_add_driver(&ak881x_i2c_driver);
359 static void __exit ak881x_module_exit(void)
361 i2c_del_driver(&ak881x_i2c_driver);
364 module_init(ak881x_module_init);
365 module_exit(ak881x_module_exit);
367 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
368 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
369 MODULE_LICENSE("GPL v2");