2 * wm8775 - driver version 0.0.1
4 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
6 * Based on saa7115 driver
8 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/slab.h>
31 #include <linux/ioctl.h>
32 #include <asm/uaccess.h>
33 #include <linux/i2c.h>
34 #include <linux/videodev2.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include <media/v4l2-ctrls.h>
38 #include <media/wm8775.h>
40 MODULE_DESCRIPTION("wm8775 driver");
41 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
42 MODULE_LICENSE("GPL");
46 /* ----------------------------------------------------------------------- */
50 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
54 #define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */
55 #define ALC_EN 0x100 /* R17: ALC enable */
58 struct v4l2_subdev sd;
59 struct v4l2_ctrl_handler hdl;
60 struct v4l2_ctrl *mute;
61 struct v4l2_ctrl *vol;
62 struct v4l2_ctrl *bal;
63 struct v4l2_ctrl *loud;
64 u8 input; /* Last selected input (0-0xf) */
67 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
69 return container_of(sd, struct wm8775_state, sd);
72 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
74 return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd;
77 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
79 struct i2c_client *client = v4l2_get_subdevdata(sd);
82 if (reg < 0 || reg >= TOT_REGS) {
83 v4l2_err(sd, "Invalid register R%d\n", reg);
87 for (i = 0; i < 3; i++)
88 if (i2c_smbus_write_byte_data(client,
89 (reg << 1) | (val >> 8), val & 0xff) == 0)
91 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
95 static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly)
97 struct wm8775_state *state = to_state(sd);
99 int muted = 0 != state->mute->val;
100 u16 volume = (u16)state->vol->val;
101 u16 balance = (u16)state->bal->val;
103 /* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */
104 vol_l = (min(65536 - balance, 32768) * volume) >> 23;
105 vol_r = (min(balance, (u16)32768) * volume) >> 23;
108 if (muted || quietly)
109 wm8775_write(sd, R21, 0x0c0 | state->input);
111 wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */
112 wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */
116 wm8775_write(sd, R21, state->input);
119 static int wm8775_s_routing(struct v4l2_subdev *sd,
120 u32 input, u32 output, u32 config)
122 struct wm8775_state *state = to_state(sd);
124 /* There are 4 inputs and one output. Zero or more inputs
125 are multiplexed together to the output. Hence there are
127 If only one input is active (the normal case) then the
128 input values 1, 2, 4 or 8 should be used. */
130 v4l2_err(sd, "Invalid input %d.\n", input);
133 state->input = input;
134 if (!v4l2_ctrl_g_ctrl(state->mute))
136 if (!v4l2_ctrl_g_ctrl(state->vol))
138 if (!v4l2_ctrl_g_ctrl(state->bal))
140 wm8775_set_audio(sd, 1);
144 static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl)
146 struct v4l2_subdev *sd = to_sd(ctrl);
149 case V4L2_CID_AUDIO_MUTE:
150 case V4L2_CID_AUDIO_VOLUME:
151 case V4L2_CID_AUDIO_BALANCE:
152 wm8775_set_audio(sd, 0);
154 case V4L2_CID_AUDIO_LOUDNESS:
155 wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD);
161 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
163 struct i2c_client *client = v4l2_get_subdevdata(sd);
165 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
168 static int wm8775_log_status(struct v4l2_subdev *sd)
170 struct wm8775_state *state = to_state(sd);
172 v4l2_info(sd, "Input: %d\n", state->input);
173 v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
177 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
179 wm8775_set_audio(sd, 0);
183 /* ----------------------------------------------------------------------- */
185 static const struct v4l2_ctrl_ops wm8775_ctrl_ops = {
186 .s_ctrl = wm8775_s_ctrl,
189 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
190 .log_status = wm8775_log_status,
191 .g_chip_ident = wm8775_g_chip_ident,
192 .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
193 .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
194 .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
195 .g_ctrl = v4l2_subdev_g_ctrl,
196 .s_ctrl = v4l2_subdev_s_ctrl,
197 .queryctrl = v4l2_subdev_queryctrl,
198 .querymenu = v4l2_subdev_querymenu,
201 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
202 .s_frequency = wm8775_s_frequency,
205 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
206 .s_routing = wm8775_s_routing,
209 static const struct v4l2_subdev_ops wm8775_ops = {
210 .core = &wm8775_core_ops,
211 .tuner = &wm8775_tuner_ops,
212 .audio = &wm8775_audio_ops,
215 /* ----------------------------------------------------------------------- */
217 /* i2c implementation */
221 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
224 static int wm8775_probe(struct i2c_client *client,
225 const struct i2c_device_id *id)
227 struct wm8775_state *state;
228 struct v4l2_subdev *sd;
231 /* Check if the adapter supports the needed features */
232 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
235 v4l_info(client, "chip found @ 0x%02x (%s)\n",
236 client->addr << 1, client->adapter->name);
238 state = kzalloc(sizeof(struct wm8775_state), GFP_KERNEL);
242 v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
243 sd->grp_id = WM8775_GID; /* subdev group id */
246 v4l2_ctrl_handler_init(&state->hdl, 4);
247 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
248 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
249 state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
250 V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/
251 state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
252 V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768);
253 state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops,
254 V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1);
255 sd->ctrl_handler = &state->hdl;
256 err = state->hdl.error;
258 v4l2_ctrl_handler_free(&state->hdl);
263 /* Initialize wm8775 */
266 wm8775_write(sd, R23, 0x000);
267 /* Disable zero cross detect timeout */
268 wm8775_write(sd, R7, 0x000);
269 /* HPF enable, I2S mode, 24-bit */
270 wm8775_write(sd, R11, 0x022);
271 /* Master mode, clock ratio 256fs */
272 wm8775_write(sd, R12, 0x102);
274 wm8775_write(sd, R13, 0x000);
275 /* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */
276 wm8775_write(sd, R16, 0x1bb);
277 /* Set ALC mode and hold time */
278 wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD);
279 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
280 wm8775_write(sd, R18, 0x0a2);
281 /* Enable noise gate, threshold -72dBfs */
282 wm8775_write(sd, R19, 0x005);
283 /* Transient window 4ms, ALC min gain -5dB */
284 wm8775_write(sd, R20, 0x0fb);
286 wm8775_set_audio(sd, 1); /* set volume/mute/mux */
291 static int wm8775_remove(struct i2c_client *client)
293 struct v4l2_subdev *sd = i2c_get_clientdata(client);
294 struct wm8775_state *state = to_state(sd);
296 v4l2_device_unregister_subdev(sd);
297 v4l2_ctrl_handler_free(&state->hdl);
302 static const struct i2c_device_id wm8775_id[] = {
306 MODULE_DEVICE_TABLE(i2c, wm8775_id);
308 static struct i2c_driver wm8775_driver = {
310 .owner = THIS_MODULE,
313 .probe = wm8775_probe,
314 .remove = wm8775_remove,
315 .id_table = wm8775_id,
318 static __init int init_wm8775(void)
320 return i2c_add_driver(&wm8775_driver);
323 static __exit void exit_wm8775(void)
325 i2c_del_driver(&wm8775_driver);
328 module_init(init_wm8775);
329 module_exit(exit_wm8775);