Pull dock into release branch
[linux-2.6] / drivers / media / video / wm8739.c
1 /*
2  * wm8739
3  *
4  * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
5  *
6  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
7  * - Cleanup
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/ioctl.h>
27 #include <asm/uaccess.h>
28 #include <linux/i2c.h>
29 #include <linux/i2c-id.h>
30 #include <linux/videodev.h>
31 #include <media/v4l2-common.h>
32
33 MODULE_DESCRIPTION("wm8739 driver");
34 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
35 MODULE_LICENSE("GPL");
36
37 static int debug = 0;
38 static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
39
40 module_param(debug, int, 0644);
41
42 MODULE_PARM_DESC(debug, "Debug level (0-1)");
43
44
45 I2C_CLIENT_INSMOD;
46
47 /* ------------------------------------------------------------------------ */
48
49 enum {
50         R0 = 0, R1,
51         R5 = 5, R6, R7, R8, R9, R15 = 15,
52         TOT_REGS
53 };
54
55 struct wm8739_state {
56         u32 clock_freq;
57         u8 muted;
58         u16 volume;
59         u16 balance;
60         u8 vol_l;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
61         u8 vol_r;               /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
62 };
63
64 /* ------------------------------------------------------------------------ */
65
66 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
67 {
68         int i;
69
70         if (reg < 0 || reg >= TOT_REGS) {
71                 v4l_err(client, "Invalid register R%d\n", reg);
72                 return -1;
73         }
74
75         v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
76
77         for (i = 0; i < 3; i++) {
78                 if (i2c_smbus_write_byte_data(client, (reg << 1) |
79                                         (val >> 8), val & 0xff) == 0) {
80                         return 0;
81                 }
82         }
83         v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
84         return -1;
85 }
86
87 /* write regs to set audio volume etc */
88 static void wm8739_set_audio(struct i2c_client *client)
89 {
90         struct wm8739_state *state = i2c_get_clientdata(client);
91         u16 mute = state->muted ? 0x80 : 0;
92
93         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
94          * Default setting: 0x17 = 0 dB
95          */
96         wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
97         wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
98 }
99
100 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
101 {
102         struct wm8739_state *state = i2c_get_clientdata(client);
103
104         switch (ctrl->id) {
105         case V4L2_CID_AUDIO_MUTE:
106                 ctrl->value = state->muted;
107                 break;
108
109         case V4L2_CID_AUDIO_VOLUME:
110                 ctrl->value = state->volume;
111                 break;
112
113         case V4L2_CID_AUDIO_BALANCE:
114                 ctrl->value = state->balance;
115                 break;
116
117         default:
118                 return -EINVAL;
119         }
120         return 0;
121 }
122
123 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
124 {
125         struct wm8739_state *state = i2c_get_clientdata(client);
126         unsigned int work_l, work_r;
127
128         switch (ctrl->id) {
129         case V4L2_CID_AUDIO_MUTE:
130                 state->muted = ctrl->value;
131                 break;
132
133         case V4L2_CID_AUDIO_VOLUME:
134                 state->volume = ctrl->value;
135                 break;
136
137         case V4L2_CID_AUDIO_BALANCE:
138                 state->balance = ctrl->value;
139                 break;
140
141         default:
142                 return -EINVAL;
143         }
144
145         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
146         work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
147         work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
148
149         state->vol_l = (long)work_l * 31 / 65535;
150         state->vol_r = (long)work_r * 31 / 65535;
151
152         /* set audio volume etc. */
153         wm8739_set_audio(client);
154         return 0;
155 }
156
157 /* ------------------------------------------------------------------------ */
158
159 static struct v4l2_queryctrl wm8739_qctrl[] = {
160         {
161                 .id            = V4L2_CID_AUDIO_VOLUME,
162                 .name          = "Volume",
163                 .minimum       = 0,
164                 .maximum       = 65535,
165                 .step          = 65535/100,
166                 .default_value = 58880,
167                 .flags         = 0,
168                 .type          = V4L2_CTRL_TYPE_INTEGER,
169         },{
170                 .id            = V4L2_CID_AUDIO_MUTE,
171                 .name          = "Mute",
172                 .minimum       = 0,
173                 .maximum       = 1,
174                 .step          = 1,
175                 .default_value = 1,
176                 .flags         = 0,
177                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
178         },{
179                 .id            = V4L2_CID_AUDIO_BALANCE,
180                 .name          = "Balance",
181                 .minimum       = 0,
182                 .maximum       = 65535,
183                 .step          = 65535/100,
184                 .default_value = 32768,
185                 .flags         = 0,
186                 .type          = V4L2_CTRL_TYPE_INTEGER,
187         }
188 };
189
190 /* ------------------------------------------------------------------------ */
191
192 static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
193 {
194         struct wm8739_state *state = i2c_get_clientdata(client);
195
196         switch (cmd) {
197         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
198         {
199                 u32 audiofreq = *(u32 *)arg;
200
201                 state->clock_freq = audiofreq;
202                 wm8739_write(client, R9, 0x000);        /* de-activate */
203                 switch (audiofreq) {
204                 case 44100:
205                         wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */
206                         break;
207                 case 48000:
208                         wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */
209                         break;
210                 case 32000:
211                         wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */
212                         break;
213                 default:
214                         break;
215                 }
216                 wm8739_write(client, R9, 0x001);        /* activate */
217                 break;
218         }
219
220         case VIDIOC_G_CTRL:
221                 return wm8739_get_ctrl(client, arg);
222
223         case VIDIOC_S_CTRL:
224                 return wm8739_set_ctrl(client, arg);
225
226         case VIDIOC_QUERYCTRL:
227         {
228                 struct v4l2_queryctrl *qc = arg;
229                 int i;
230
231                 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
232                         if (qc->id && qc->id == wm8739_qctrl[i].id) {
233                                 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
234                                 return 0;
235                         }
236                 return -EINVAL;
237         }
238
239         case VIDIOC_LOG_STATUS:
240                 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
241                 v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
242                                 state->muted ? " (muted)" : "");
243                 v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
244                                 state->muted ? " (muted)" : "");
245                 break;
246
247         default:
248                 return -EINVAL;
249         }
250
251         return 0;
252 }
253
254 /* ------------------------------------------------------------------------ */
255
256 /* i2c implementation */
257
258 static struct i2c_driver i2c_driver;
259
260 static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)
261 {
262         struct i2c_client *client;
263         struct wm8739_state *state;
264
265         /* Check if the adapter supports the needed features */
266         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
267                 return 0;
268
269         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
270         if (client == NULL)
271                 return -ENOMEM;
272
273         client->addr = address;
274         client->adapter = adapter;
275         client->driver = &i2c_driver;
276         snprintf(client->name, sizeof(client->name) - 1, "wm8739");
277
278         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
279
280         state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
281         if (state == NULL) {
282                 kfree(client);
283                 return -ENOMEM;
284         }
285         state->vol_l = 0x17; /* 0dB */
286         state->vol_r = 0x17; /* 0dB */
287         state->muted = 0;
288         state->balance = 32768;
289         /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
290         state->volume = ((long)state->vol_l + 1) * 65535 / 31;
291         state->clock_freq = 48000;
292         i2c_set_clientdata(client, state);
293
294         /* initialize wm8739 */
295         wm8739_write(client, R15, 0x00); /* reset */
296         wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
297         wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
298         wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
299                                          /* Enable Master mode */
300                                          /* 24 bit, MSB first/left justified */
301         wm8739_write(client, R8, 0x000); /* sampling control */
302                                          /* normal, 256fs, 48KHz sampling rate */
303         wm8739_write(client, R9, 0x001); /* activate */
304         wm8739_set_audio(client);        /* set volume/mute */
305
306         i2c_attach_client(client);
307
308         return 0;
309 }
310
311 static int wm8739_probe(struct i2c_adapter *adapter)
312 {
313         if (adapter->class & I2C_CLASS_TV_ANALOG)
314                 return i2c_probe(adapter, &addr_data, wm8739_attach);
315         return 0;
316 }
317
318 static int wm8739_detach(struct i2c_client *client)
319 {
320         int err;
321
322         err = i2c_detach_client(client);
323         if (err)
324                 return err;
325
326         kfree(client);
327         return 0;
328 }
329
330 /* ----------------------------------------------------------------------- */
331
332 /* i2c implementation */
333 static struct i2c_driver i2c_driver = {
334         .driver = {
335                 .name = "wm8739",
336         },
337         .id = I2C_DRIVERID_WM8739,
338         .attach_adapter = wm8739_probe,
339         .detach_client  = wm8739_detach,
340         .command = wm8739_command,
341 };
342
343
344 static int __init wm8739_init_module(void)
345 {
346         return i2c_add_driver(&i2c_driver);
347 }
348
349 static void __exit wm8739_cleanup_module(void)
350 {
351         i2c_del_driver(&i2c_driver);
352 }
353
354 module_init(wm8739_init_module);
355 module_exit(wm8739_cleanup_module);