blob: b388654d48cd6bce3859ff7601e7a7ab1abffc82 [file] [log] [blame]
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -03001/*
2 * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
3 *
4 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 *
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.
9 */
10
11#include <linux/i2c.h>
12#include <linux/init.h>
13#include <linux/platform_device.h>
Randy Dunlap1db2c222010-05-20 18:08:23 -030014#include <linux/slab.h>
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -030015#include <linux/videodev2.h>
16
17#include <media/ak881x.h>
18#include <media/v4l2-chip-ident.h>
19#include <media/v4l2-common.h>
20#include <media/v4l2-device.h>
21
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
30
31struct ak881x {
32 struct v4l2_subdev subdev;
33 struct ak881x_pdata *pdata;
34 unsigned int lines;
35 int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
36 char revision; /* DEVICE_REVISION content */
37};
38
39static int reg_read(struct i2c_client *client, const u8 reg)
40{
41 return i2c_smbus_read_byte_data(client, reg);
42}
43
44static int reg_write(struct i2c_client *client, const u8 reg,
45 const u8 data)
46{
47 return i2c_smbus_write_byte_data(client, reg, data);
48}
49
50static int reg_set(struct i2c_client *client, const u8 reg,
51 const u8 data, u8 mask)
52{
53 int ret = reg_read(client, reg);
54 if (ret < 0)
55 return ret;
56 return reg_write(client, reg, (ret & ~mask) | (data & mask));
57}
58
59static struct ak881x *to_ak881x(const struct i2c_client *client)
60{
61 return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
62}
63
64static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
65 struct v4l2_dbg_chip_ident *id)
66{
67 struct i2c_client *client = v4l2_get_subdevdata(sd);
68 struct ak881x *ak881x = to_ak881x(client);
69
70 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
71 return -EINVAL;
72
73 if (id->match.addr != client->addr)
74 return -ENODEV;
75
76 id->ident = ak881x->id;
77 id->revision = ak881x->revision;
78
79 return 0;
80}
81
82#ifdef CONFIG_VIDEO_ADV_DEBUG
83static int ak881x_g_register(struct v4l2_subdev *sd,
84 struct v4l2_dbg_register *reg)
85{
86 struct i2c_client *client = v4l2_get_subdevdata(sd);
87
88 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
89 return -EINVAL;
90
91 if (reg->match.addr != client->addr)
92 return -ENODEV;
93
94 reg->val = reg_read(client, reg->reg);
95
96 if (reg->val > 0xffff)
97 return -EIO;
98
99 return 0;
100}
101
102static int ak881x_s_register(struct v4l2_subdev *sd,
103 struct v4l2_dbg_register *reg)
104{
105 struct i2c_client *client = v4l2_get_subdevdata(sd);
106
107 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
108 return -EINVAL;
109
110 if (reg->match.addr != client->addr)
111 return -ENODEV;
112
113 if (reg_write(client, reg->reg, reg->val) < 0)
114 return -EIO;
115
116 return 0;
117}
118#endif
119
120static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
121 struct v4l2_mbus_framefmt *mf)
122{
123 struct i2c_client *client = v4l2_get_subdevdata(sd);
124 struct ak881x *ak881x = to_ak881x(client);
125
126 v4l_bound_align_image(&mf->width, 0, 720, 2,
127 &mf->height, 0, ak881x->lines, 1, 0);
128 mf->field = V4L2_FIELD_INTERLACED;
Guennadi Liakhovetskiace6e972010-07-22 16:52:51 -0300129 mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -0300130 mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
131
132 return 0;
133}
134
135static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
136 struct v4l2_mbus_framefmt *mf)
137{
138 if (mf->field != V4L2_FIELD_INTERLACED ||
Guennadi Liakhovetskiace6e972010-07-22 16:52:51 -0300139 mf->code != V4L2_MBUS_FMT_YUYV8_2X8)
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -0300140 return -EINVAL;
141
142 return ak881x_try_g_mbus_fmt(sd, mf);
143}
144
Hans Verkuil3805f202010-05-08 17:55:00 -0300145static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -0300146 enum v4l2_mbus_pixelcode *code)
147{
148 if (index)
149 return -EINVAL;
150
Guennadi Liakhovetskiace6e972010-07-22 16:52:51 -0300151 *code = V4L2_MBUS_FMT_YUYV8_2X8;
Guennadi Liakhovetskiaec11e52010-03-29 04:45:22 -0300152 return 0;
153}
154
155static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
156{
157 struct i2c_client *client = v4l2_get_subdevdata(sd);
158 struct ak881x *ak881x = to_ak881x(client);
159
160 a->bounds.left = 0;
161 a->bounds.top = 0;
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;
168
169 return 0;
170}
171
172static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
173{
174 struct i2c_client *client = v4l2_get_subdevdata(sd);
175 struct ak881x *ak881x = to_ak881x(client);
176 u8 vp1;
177
178 if (std == V4L2_STD_NTSC_443) {
179 vp1 = 3;
180 ak881x->lines = 480;
181 } else if (std == V4L2_STD_PAL_M) {
182 vp1 = 5;
183 ak881x->lines = 480;
184 } else if (std == V4L2_STD_PAL_60) {
185 vp1 = 7;
186 ak881x->lines = 480;
187 } else if (std && !(std & ~V4L2_STD_PAL)) {
188 vp1 = 0xf;
189 ak881x->lines = 576;
190 } else if (std && !(std & ~V4L2_STD_NTSC)) {
191 vp1 = 0;
192 ak881x->lines = 480;
193 } else {
194 /* No SECAM or PAL_N/Nc supported */
195 return -EINVAL;
196 }
197
198 reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
199
200 return 0;
201}
202
203static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
204{
205 struct i2c_client *client = v4l2_get_subdevdata(sd);
206 struct ak881x *ak881x = to_ak881x(client);
207
208 if (enable) {
209 u8 dac;
210 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
211 /* Default: composite output */
212 if (ak881x->pdata->flags & AK881X_COMPONENT)
213 dac = 3;
214 else
215 dac = 4;
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));
220 } else {
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));
225 }
226
227 return 0;
228}
229
230static 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,
235#endif
236};
237
238static 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,
246};
247
248static struct v4l2_subdev_ops ak881x_subdev_ops = {
249 .core = &ak881x_subdev_core_ops,
250 .video = &ak881x_subdev_video_ops,
251};
252
253static int ak881x_probe(struct i2c_client *client,
254 const struct i2c_device_id *did)
255{
256 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
257 struct ak881x *ak881x;
258 u8 ifmode, data;
259
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");
263 return -EIO;
264 }
265
266 ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
267 if (!ak881x)
268 return -ENOMEM;
269
270 v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
271
272 data = reg_read(client, AK881X_DEVICE_ID);
273
274 switch (data) {
275 case 0x13:
276 ak881x->id = V4L2_IDENT_AK8813;
277 break;
278 case 0x14:
279 ak881x->id = V4L2_IDENT_AK8814;
280 break;
281 default:
282 dev_err(&client->dev,
283 "No ak881x chip detected, register read %x\n", data);
284 kfree(ak881x);
285 return -ENODEV;
286 }
287
288 ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
289 ak881x->pdata = client->dev.platform_data;
290
291 if (ak881x->pdata) {
292 if (ak881x->pdata->flags & AK881X_FIELD)
293 ifmode = 4;
294 else
295 ifmode = 0;
296
297 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
298 case AK881X_IF_MODE_BT656:
299 ifmode |= 1;
300 break;
301 case AK881X_IF_MODE_MASTER:
302 ifmode |= 2;
303 break;
304 case AK881X_IF_MODE_SLAVE:
305 default:
306 break;
307 }
308
309 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
310
311 /*
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
315 */
316 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
317 }
318
319 /* Hardware default: NTSC-M */
320 ak881x->lines = 480;
321
322 dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
323 data, ak881x->revision);
324
325 return 0;
326}
327
328static int ak881x_remove(struct i2c_client *client)
329{
330 struct ak881x *ak881x = to_ak881x(client);
331
332 v4l2_device_unregister_subdev(&ak881x->subdev);
333 kfree(ak881x);
334
335 return 0;
336}
337
338static const struct i2c_device_id ak881x_id[] = {
339 { "ak8813", 0 },
340 { "ak8814", 0 },
341 { }
342};
343MODULE_DEVICE_TABLE(i2c, ak881x_id);
344
345static struct i2c_driver ak881x_i2c_driver = {
346 .driver = {
347 .name = "ak881x",
348 },
349 .probe = ak881x_probe,
350 .remove = ak881x_remove,
351 .id_table = ak881x_id,
352};
353
354static int __init ak881x_module_init(void)
355{
356 return i2c_add_driver(&ak881x_i2c_driver);
357}
358
359static void __exit ak881x_module_exit(void)
360{
361 i2c_del_driver(&ak881x_i2c_driver);
362}
363
364module_init(ak881x_module_init);
365module_exit(ak881x_module_exit);
366
367MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
368MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
369MODULE_LICENSE("GPL v2");