Merge git://git.infradead.org/mtd-2.6
[pandora-kernel.git] / drivers / media / video / ak881x.c
1 /*
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>
14 #include <linux/slab.h>
15 #include <linux/videodev2.h>
16 #include <linux/module.h>
17
18 #include <media/ak881x.h>
19 #include <media/v4l2-chip-ident.h>
20 #include <media/v4l2-common.h>
21 #include <media/v4l2-device.h>
22
23 #define AK881X_INTERFACE_MODE   0
24 #define AK881X_VIDEO_PROCESS1   1
25 #define AK881X_VIDEO_PROCESS2   2
26 #define AK881X_VIDEO_PROCESS3   3
27 #define AK881X_DAC_MODE         5
28 #define AK881X_STATUS           0x24
29 #define AK881X_DEVICE_ID        0x25
30 #define AK881X_DEVICE_REVISION  0x26
31
32 struct ak881x {
33         struct v4l2_subdev subdev;
34         struct ak881x_pdata *pdata;
35         unsigned int lines;
36         int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
37         char revision;  /* DEVICE_REVISION content */
38 };
39
40 static int reg_read(struct i2c_client *client, const u8 reg)
41 {
42         return i2c_smbus_read_byte_data(client, reg);
43 }
44
45 static int reg_write(struct i2c_client *client, const u8 reg,
46                      const u8 data)
47 {
48         return i2c_smbus_write_byte_data(client, reg, data);
49 }
50
51 static int reg_set(struct i2c_client *client, const u8 reg,
52                    const u8 data, u8 mask)
53 {
54         int ret = reg_read(client, reg);
55         if (ret < 0)
56                 return ret;
57         return reg_write(client, reg, (ret & ~mask) | (data & mask));
58 }
59
60 static struct ak881x *to_ak881x(const struct i2c_client *client)
61 {
62         return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
63 }
64
65 static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
66                                struct v4l2_dbg_chip_ident *id)
67 {
68         struct i2c_client *client = v4l2_get_subdevdata(sd);
69         struct ak881x *ak881x = to_ak881x(client);
70
71         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
72                 return -EINVAL;
73
74         if (id->match.addr != client->addr)
75                 return -ENODEV;
76
77         id->ident       = ak881x->id;
78         id->revision    = ak881x->revision;
79
80         return 0;
81 }
82
83 #ifdef CONFIG_VIDEO_ADV_DEBUG
84 static int ak881x_g_register(struct v4l2_subdev *sd,
85                              struct v4l2_dbg_register *reg)
86 {
87         struct i2c_client *client = v4l2_get_subdevdata(sd);
88
89         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
90                 return -EINVAL;
91
92         if (reg->match.addr != client->addr)
93                 return -ENODEV;
94
95         reg->val = reg_read(client, reg->reg);
96
97         if (reg->val > 0xffff)
98                 return -EIO;
99
100         return 0;
101 }
102
103 static int ak881x_s_register(struct v4l2_subdev *sd,
104                              struct v4l2_dbg_register *reg)
105 {
106         struct i2c_client *client = v4l2_get_subdevdata(sd);
107
108         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
109                 return -EINVAL;
110
111         if (reg->match.addr != client->addr)
112                 return -ENODEV;
113
114         if (reg_write(client, reg->reg, reg->val) < 0)
115                 return -EIO;
116
117         return 0;
118 }
119 #endif
120
121 static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
122                                  struct v4l2_mbus_framefmt *mf)
123 {
124         struct i2c_client *client = v4l2_get_subdevdata(sd);
125         struct ak881x *ak881x = to_ak881x(client);
126
127         v4l_bound_align_image(&mf->width, 0, 720, 2,
128                               &mf->height, 0, ak881x->lines, 1, 0);
129         mf->field       = V4L2_FIELD_INTERLACED;
130         mf->code        = V4L2_MBUS_FMT_YUYV8_2X8;
131         mf->colorspace  = V4L2_COLORSPACE_SMPTE170M;
132
133         return 0;
134 }
135
136 static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
137                              struct v4l2_mbus_framefmt *mf)
138 {
139         if (mf->field != V4L2_FIELD_INTERLACED ||
140             mf->code != V4L2_MBUS_FMT_YUYV8_2X8)
141                 return -EINVAL;
142
143         return ak881x_try_g_mbus_fmt(sd, mf);
144 }
145
146 static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
147                                 enum v4l2_mbus_pixelcode *code)
148 {
149         if (index)
150                 return -EINVAL;
151
152         *code = V4L2_MBUS_FMT_YUYV8_2X8;
153         return 0;
154 }
155
156 static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
157 {
158         struct i2c_client *client = v4l2_get_subdevdata(sd);
159         struct ak881x *ak881x = to_ak881x(client);
160
161         a->bounds.left                  = 0;
162         a->bounds.top                   = 0;
163         a->bounds.width                 = 720;
164         a->bounds.height                = ak881x->lines;
165         a->defrect                      = a->bounds;
166         a->type                         = V4L2_BUF_TYPE_VIDEO_OUTPUT;
167         a->pixelaspect.numerator        = 1;
168         a->pixelaspect.denominator      = 1;
169
170         return 0;
171 }
172
173 static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
174 {
175         struct i2c_client *client = v4l2_get_subdevdata(sd);
176         struct ak881x *ak881x = to_ak881x(client);
177         u8 vp1;
178
179         if (std == V4L2_STD_NTSC_443) {
180                 vp1 = 3;
181                 ak881x->lines = 480;
182         } else if (std == V4L2_STD_PAL_M) {
183                 vp1 = 5;
184                 ak881x->lines = 480;
185         } else if (std == V4L2_STD_PAL_60) {
186                 vp1 = 7;
187                 ak881x->lines = 480;
188         } else if (std && !(std & ~V4L2_STD_PAL)) {
189                 vp1 = 0xf;
190                 ak881x->lines = 576;
191         } else if (std && !(std & ~V4L2_STD_NTSC)) {
192                 vp1 = 0;
193                 ak881x->lines = 480;
194         } else {
195                 /* No SECAM or PAL_N/Nc supported */
196                 return -EINVAL;
197         }
198
199         reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
200
201         return 0;
202 }
203
204 static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
205 {
206         struct i2c_client *client = v4l2_get_subdevdata(sd);
207         struct ak881x *ak881x = to_ak881x(client);
208
209         if (enable) {
210                 u8 dac;
211                 /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
212                 /* Default: composite output */
213                 if (ak881x->pdata->flags & AK881X_COMPONENT)
214                         dac = 3;
215                 else
216                         dac = 4;
217                 /* Turn on the DAC(s) */
218                 reg_write(client, AK881X_DAC_MODE, dac);
219                 dev_dbg(&client->dev, "chip status 0x%x\n",
220                         reg_read(client, AK881X_STATUS));
221         } else {
222                 /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
223                 reg_write(client, AK881X_DAC_MODE, 0);
224                 dev_dbg(&client->dev, "chip status 0x%x\n",
225                         reg_read(client, AK881X_STATUS));
226         }
227
228         return 0;
229 }
230
231 static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
232         .g_chip_ident   = ak881x_g_chip_ident,
233 #ifdef CONFIG_VIDEO_ADV_DEBUG
234         .g_register     = ak881x_g_register,
235         .s_register     = ak881x_s_register,
236 #endif
237 };
238
239 static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
240         .s_mbus_fmt     = ak881x_s_mbus_fmt,
241         .g_mbus_fmt     = ak881x_try_g_mbus_fmt,
242         .try_mbus_fmt   = ak881x_try_g_mbus_fmt,
243         .cropcap        = ak881x_cropcap,
244         .enum_mbus_fmt  = ak881x_enum_mbus_fmt,
245         .s_std_output   = ak881x_s_std_output,
246         .s_stream       = ak881x_s_stream,
247 };
248
249 static struct v4l2_subdev_ops ak881x_subdev_ops = {
250         .core   = &ak881x_subdev_core_ops,
251         .video  = &ak881x_subdev_video_ops,
252 };
253
254 static int ak881x_probe(struct i2c_client *client,
255                         const struct i2c_device_id *did)
256 {
257         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
258         struct ak881x *ak881x;
259         u8 ifmode, data;
260
261         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
262                 dev_warn(&adapter->dev,
263                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
264                 return -EIO;
265         }
266
267         ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
268         if (!ak881x)
269                 return -ENOMEM;
270
271         v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
272
273         data = reg_read(client, AK881X_DEVICE_ID);
274
275         switch (data) {
276         case 0x13:
277                 ak881x->id = V4L2_IDENT_AK8813;
278                 break;
279         case 0x14:
280                 ak881x->id = V4L2_IDENT_AK8814;
281                 break;
282         default:
283                 dev_err(&client->dev,
284                         "No ak881x chip detected, register read %x\n", data);
285                 kfree(ak881x);
286                 return -ENODEV;
287         }
288
289         ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
290         ak881x->pdata = client->dev.platform_data;
291
292         if (ak881x->pdata) {
293                 if (ak881x->pdata->flags & AK881X_FIELD)
294                         ifmode = 4;
295                 else
296                         ifmode = 0;
297
298                 switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
299                 case AK881X_IF_MODE_BT656:
300                         ifmode |= 1;
301                         break;
302                 case AK881X_IF_MODE_MASTER:
303                         ifmode |= 2;
304                         break;
305                 case AK881X_IF_MODE_SLAVE:
306                 default:
307                         break;
308                 }
309
310                 dev_dbg(&client->dev, "IF mode %x\n", ifmode);
311
312                 /*
313                  * "Line Blanking No." seems to be the same as the number of
314                  * "black" lines on, e.g., SuperH VOU, whose default value of 20
315                  * "incidentally" matches ak881x' default
316                  */
317                 reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
318         }
319
320         /* Hardware default: NTSC-M */
321         ak881x->lines = 480;
322
323         dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
324                  data, ak881x->revision);
325
326         return 0;
327 }
328
329 static int ak881x_remove(struct i2c_client *client)
330 {
331         struct ak881x *ak881x = to_ak881x(client);
332
333         v4l2_device_unregister_subdev(&ak881x->subdev);
334         kfree(ak881x);
335
336         return 0;
337 }
338
339 static const struct i2c_device_id ak881x_id[] = {
340         { "ak8813", 0 },
341         { "ak8814", 0 },
342         { }
343 };
344 MODULE_DEVICE_TABLE(i2c, ak881x_id);
345
346 static struct i2c_driver ak881x_i2c_driver = {
347         .driver = {
348                 .name = "ak881x",
349         },
350         .probe          = ak881x_probe,
351         .remove         = ak881x_remove,
352         .id_table       = ak881x_id,
353 };
354
355 static int __init ak881x_module_init(void)
356 {
357         return i2c_add_driver(&ak881x_i2c_driver);
358 }
359
360 static void __exit ak881x_module_exit(void)
361 {
362         i2c_del_driver(&ak881x_i2c_driver);
363 }
364
365 module_init(ak881x_module_init);
366 module_exit(ak881x_module_exit);
367
368 MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
369 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
370 MODULE_LICENSE("GPL v2");