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/ioctl.h>
31 #include <asm/uaccess.h>
32 #include <linux/i2c.h>
33 #include <linux/i2c-id.h>
34 #include <linux/videodev2.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include <media/v4l2-i2c-drv.h>
39 MODULE_DESCRIPTION("wm8775 driver");
40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
41 MODULE_LICENSE("GPL");
45 /* ----------------------------------------------------------------------- */
49 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
54 struct v4l2_subdev sd;
55 u8 input; /* Last selected input (0-0xf) */
59 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
61 return container_of(sd, struct wm8775_state, sd);
64 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
66 struct i2c_client *client = v4l2_get_subdevdata(sd);
69 if (reg < 0 || reg >= TOT_REGS) {
70 v4l2_err(sd, "Invalid register R%d\n", reg);
74 for (i = 0; i < 3; i++)
75 if (i2c_smbus_write_byte_data(client,
76 (reg << 1) | (val >> 8), val & 0xff) == 0)
78 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
82 static int wm8775_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
84 struct wm8775_state *state = to_state(sd);
86 /* There are 4 inputs and one output. Zero or more inputs
87 are multiplexed together to the output. Hence there are
89 If only one input is active (the normal case) then the
90 input values 1, 2, 4 or 8 should be used. */
91 if (route->input > 15) {
92 v4l2_err(sd, "Invalid input %d.\n", route->input);
95 state->input = route->input;
98 wm8775_write(sd, R21, 0x0c0);
99 wm8775_write(sd, R14, 0x1d4);
100 wm8775_write(sd, R15, 0x1d4);
101 wm8775_write(sd, R21, 0x100 + state->input);
105 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
107 struct wm8775_state *state = to_state(sd);
109 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
111 ctrl->value = state->muted;
115 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
117 struct wm8775_state *state = to_state(sd);
119 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
121 state->muted = ctrl->value;
122 wm8775_write(sd, R21, 0x0c0);
123 wm8775_write(sd, R14, 0x1d4);
124 wm8775_write(sd, R15, 0x1d4);
126 wm8775_write(sd, R21, 0x100 + state->input);
130 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
132 struct i2c_client *client = v4l2_get_subdevdata(sd);
134 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
137 static int wm8775_log_status(struct v4l2_subdev *sd)
139 struct wm8775_state *state = to_state(sd);
141 v4l2_info(sd, "Input: %d%s\n", state->input,
142 state->muted ? " (muted)" : "");
146 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
148 struct wm8775_state *state = to_state(sd);
150 /* If I remove this, then it can happen that I have no
151 sound the first time I tune from static to a valid channel.
152 It's difficult to reproduce and is almost certainly related
153 to the zero cross detect circuit. */
154 wm8775_write(sd, R21, 0x0c0);
155 wm8775_write(sd, R14, 0x1d4);
156 wm8775_write(sd, R15, 0x1d4);
157 wm8775_write(sd, R21, 0x100 + state->input);
161 /* ----------------------------------------------------------------------- */
163 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
164 .log_status = wm8775_log_status,
165 .g_chip_ident = wm8775_g_chip_ident,
166 .g_ctrl = wm8775_g_ctrl,
167 .s_ctrl = wm8775_s_ctrl,
170 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
171 .s_frequency = wm8775_s_frequency,
174 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
175 .s_routing = wm8775_s_routing,
178 static const struct v4l2_subdev_ops wm8775_ops = {
179 .core = &wm8775_core_ops,
180 .tuner = &wm8775_tuner_ops,
181 .audio = &wm8775_audio_ops,
184 /* ----------------------------------------------------------------------- */
186 /* i2c implementation */
190 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
193 static int wm8775_probe(struct i2c_client *client,
194 const struct i2c_device_id *id)
196 struct wm8775_state *state;
197 struct v4l2_subdev *sd;
199 /* Check if the adapter supports the needed features */
200 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
203 v4l_info(client, "chip found @ 0x%02x (%s)\n",
204 client->addr << 1, client->adapter->name);
206 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
210 v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
214 /* Initialize wm8775 */
217 wm8775_write(sd, R23, 0x000);
218 /* Disable zero cross detect timeout */
219 wm8775_write(sd, R7, 0x000);
220 /* Left justified, 24-bit mode */
221 wm8775_write(sd, R11, 0x021);
222 /* Master mode, clock ratio 256fs */
223 wm8775_write(sd, R12, 0x102);
225 wm8775_write(sd, R13, 0x000);
226 /* ADC gain +2.5dB, enable zero cross */
227 wm8775_write(sd, R14, 0x1d4);
228 /* ADC gain +2.5dB, enable zero cross */
229 wm8775_write(sd, R15, 0x1d4);
230 /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
231 wm8775_write(sd, R16, 0x1bf);
232 /* Enable gain control, use zero cross detection,
233 ALC hold time 42.6 ms */
234 wm8775_write(sd, R17, 0x185);
235 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
236 wm8775_write(sd, R18, 0x0a2);
237 /* Enable noise gate, threshold -72dBfs */
238 wm8775_write(sd, R19, 0x005);
239 /* Transient window 4ms, lower PGA gain limit -1dB */
240 wm8775_write(sd, R20, 0x07a);
241 /* LRBOTH = 1, use input 2. */
242 wm8775_write(sd, R21, 0x102);
246 static int wm8775_remove(struct i2c_client *client)
248 struct v4l2_subdev *sd = i2c_get_clientdata(client);
250 v4l2_device_unregister_subdev(sd);
255 static const struct i2c_device_id wm8775_id[] = {
259 MODULE_DEVICE_TABLE(i2c, wm8775_id);
261 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
263 .probe = wm8775_probe,
264 .remove = wm8775_remove,
265 .id_table = wm8775_id,