V4L/DVB: wm8739: convert to the new control framework
[pandora-kernel.git] / 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/slab.h>
27 #include <linux/ioctl.h>
28 #include <asm/uaccess.h>
29 #include <linux/i2c.h>
30 #include <linux/videodev2.h>
31 #include <media/v4l2-device.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv.h>
34 #include <media/v4l2-ctrls.h>
35
36 MODULE_DESCRIPTION("wm8739 driver");
37 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
38 MODULE_LICENSE("GPL");
39
40 static int debug;
41
42 module_param(debug, int, 0644);
43
44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
45
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         struct v4l2_subdev sd;
57         struct v4l2_ctrl_handler hdl;
58         struct {
59                 /* audio cluster */
60                 struct v4l2_ctrl *volume;
61                 struct v4l2_ctrl *mute;
62                 struct v4l2_ctrl *balance;
63         };
64         u32 clock_freq;
65 };
66
67 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
68 {
69         return container_of(sd, struct wm8739_state, sd);
70 }
71
72 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
73 {
74         return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
75 }
76
77 /* ------------------------------------------------------------------------ */
78
79 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
80 {
81         struct i2c_client *client = v4l2_get_subdevdata(sd);
82         int i;
83
84         if (reg < 0 || reg >= TOT_REGS) {
85                 v4l2_err(sd, "Invalid register R%d\n", reg);
86                 return -1;
87         }
88
89         v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
90
91         for (i = 0; i < 3; i++)
92                 if (i2c_smbus_write_byte_data(client,
93                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
94                         return 0;
95         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
96         return -1;
97 }
98
99 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
100 {
101         struct v4l2_subdev *sd = to_sd(ctrl);
102         struct wm8739_state *state = to_state(sd);
103         unsigned int work_l, work_r;
104         u8 vol_l;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
105         u8 vol_r;       /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
106         u16 mute;
107
108         switch (ctrl->id) {
109         case V4L2_CID_AUDIO_VOLUME:
110                 break;
111
112         default:
113                 return -EINVAL;
114         }
115
116         /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
117         work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
118         work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
119
120         vol_l = (long)work_l * 31 / 65535;
121         vol_r = (long)work_r * 31 / 65535;
122
123         /* set audio volume etc. */
124         mute = state->mute->val ? 0x80 : 0;
125
126         /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
127          * Default setting: 0x17 = 0 dB
128          */
129         wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
130         wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
131         return 0;
132 }
133
134 /* ------------------------------------------------------------------------ */
135
136 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
137 {
138         struct wm8739_state *state = to_state(sd);
139
140         state->clock_freq = audiofreq;
141         /* de-activate */
142         wm8739_write(sd, R9, 0x000);
143         switch (audiofreq) {
144         case 44100:
145                 /* 256fps, fs=44.1k */
146                 wm8739_write(sd, R8, 0x020);
147                 break;
148         case 48000:
149                 /* 256fps, fs=48k */
150                 wm8739_write(sd, R8, 0x000);
151                 break;
152         case 32000:
153                 /* 256fps, fs=32k */
154                 wm8739_write(sd, R8, 0x018);
155                 break;
156         default:
157                 break;
158         }
159         /* activate */
160         wm8739_write(sd, R9, 0x001);
161         return 0;
162 }
163
164 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
165 {
166         struct i2c_client *client = v4l2_get_subdevdata(sd);
167
168         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
169 }
170
171 static int wm8739_log_status(struct v4l2_subdev *sd)
172 {
173         struct wm8739_state *state = to_state(sd);
174
175         v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
176         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
177         return 0;
178 }
179
180 /* ----------------------------------------------------------------------- */
181
182 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
183         .s_ctrl = wm8739_s_ctrl,
184 };
185
186 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
187         .log_status = wm8739_log_status,
188         .g_chip_ident = wm8739_g_chip_ident,
189         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
190         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
191         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
192         .g_ctrl = v4l2_subdev_g_ctrl,
193         .s_ctrl = v4l2_subdev_s_ctrl,
194         .queryctrl = v4l2_subdev_queryctrl,
195         .querymenu = v4l2_subdev_querymenu,
196 };
197
198 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
199         .s_clock_freq = wm8739_s_clock_freq,
200 };
201
202 static const struct v4l2_subdev_ops wm8739_ops = {
203         .core = &wm8739_core_ops,
204         .audio = &wm8739_audio_ops,
205 };
206
207 /* ------------------------------------------------------------------------ */
208
209 /* i2c implementation */
210
211 static int wm8739_probe(struct i2c_client *client,
212                         const struct i2c_device_id *id)
213 {
214         struct wm8739_state *state;
215         struct v4l2_subdev *sd;
216
217         /* Check if the adapter supports the needed features */
218         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
219                 return -EIO;
220
221         v4l_info(client, "chip found @ 0x%x (%s)\n",
222                         client->addr << 1, client->adapter->name);
223
224         state = kzalloc(sizeof(struct wm8739_state), GFP_KERNEL);
225         if (state == NULL)
226                 return -ENOMEM;
227         sd = &state->sd;
228         v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
229         v4l2_ctrl_handler_init(&state->hdl, 2);
230         state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
231                         V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
232         state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
233                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
234         state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
235                         V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
236         sd->ctrl_handler = &state->hdl;
237         if (state->hdl.error) {
238                 int err = state->hdl.error;
239
240                 v4l2_ctrl_handler_free(&state->hdl);
241                 kfree(state);
242                 return err;
243         }
244         v4l2_ctrl_cluster(3, &state->volume);
245
246         state->clock_freq = 48000;
247
248         /* Initialize wm8739 */
249
250         /* reset */
251         wm8739_write(sd, R15, 0x00);
252         /* filter setting, high path, offet clear */
253         wm8739_write(sd, R5, 0x000);
254         /* ADC, OSC, Power Off mode Disable */
255         wm8739_write(sd, R6, 0x000);
256         /* Digital Audio interface format:
257            Enable Master mode, 24 bit, MSB first/left justified */
258         wm8739_write(sd, R7, 0x049);
259         /* sampling control: normal, 256fs, 48KHz sampling rate */
260         wm8739_write(sd, R8, 0x000);
261         /* activate */
262         wm8739_write(sd, R9, 0x001);
263         /* set volume/mute */
264         v4l2_ctrl_handler_setup(&state->hdl);
265         return 0;
266 }
267
268 static int wm8739_remove(struct i2c_client *client)
269 {
270         struct v4l2_subdev *sd = i2c_get_clientdata(client);
271         struct wm8739_state *state = to_state(sd);
272
273         v4l2_device_unregister_subdev(sd);
274         v4l2_ctrl_handler_free(&state->hdl);
275         kfree(to_state(sd));
276         return 0;
277 }
278
279 static const struct i2c_device_id wm8739_id[] = {
280         { "wm8739", 0 },
281         { }
282 };
283 MODULE_DEVICE_TABLE(i2c, wm8739_id);
284
285 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
286         .name = "wm8739",
287         .probe = wm8739_probe,
288         .remove = wm8739_remove,
289         .id_table = wm8739_id,
290 };