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,
83 u32 input, u32 output, u32 config)
85 struct wm8775_state *state = to_state(sd);
87 /* There are 4 inputs and one output. Zero or more inputs
88 are multiplexed together to the output. Hence there are
90 If only one input is active (the normal case) then the
91 input values 1, 2, 4 or 8 should be used. */
93 v4l2_err(sd, "Invalid input %d.\n", input);
99 wm8775_write(sd, R21, 0x0c0);
100 wm8775_write(sd, R14, 0x1d4);
101 wm8775_write(sd, R15, 0x1d4);
102 wm8775_write(sd, R21, 0x100 + state->input);
106 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
108 struct wm8775_state *state = to_state(sd);
110 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
112 ctrl->value = state->muted;
116 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
118 struct wm8775_state *state = to_state(sd);
120 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
122 state->muted = ctrl->value;
123 wm8775_write(sd, R21, 0x0c0);
124 wm8775_write(sd, R14, 0x1d4);
125 wm8775_write(sd, R15, 0x1d4);
127 wm8775_write(sd, R21, 0x100 + state->input);
131 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
133 struct i2c_client *client = v4l2_get_subdevdata(sd);
135 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
138 static int wm8775_log_status(struct v4l2_subdev *sd)
140 struct wm8775_state *state = to_state(sd);
142 v4l2_info(sd, "Input: %d%s\n", state->input,
143 state->muted ? " (muted)" : "");
147 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
149 struct wm8775_state *state = to_state(sd);
151 /* If I remove this, then it can happen that I have no
152 sound the first time I tune from static to a valid channel.
153 It's difficult to reproduce and is almost certainly related
154 to the zero cross detect circuit. */
155 wm8775_write(sd, R21, 0x0c0);
156 wm8775_write(sd, R14, 0x1d4);
157 wm8775_write(sd, R15, 0x1d4);
158 wm8775_write(sd, R21, 0x100 + state->input);
162 /* ----------------------------------------------------------------------- */
164 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
165 .log_status = wm8775_log_status,
166 .g_chip_ident = wm8775_g_chip_ident,
167 .g_ctrl = wm8775_g_ctrl,
168 .s_ctrl = wm8775_s_ctrl,
171 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
172 .s_frequency = wm8775_s_frequency,
175 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
176 .s_routing = wm8775_s_routing,
179 static const struct v4l2_subdev_ops wm8775_ops = {
180 .core = &wm8775_core_ops,
181 .tuner = &wm8775_tuner_ops,
182 .audio = &wm8775_audio_ops,
185 /* ----------------------------------------------------------------------- */
187 /* i2c implementation */
191 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
194 static int wm8775_probe(struct i2c_client *client,
195 const struct i2c_device_id *id)
197 struct wm8775_state *state;
198 struct v4l2_subdev *sd;
200 /* Check if the adapter supports the needed features */
201 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
204 v4l_info(client, "chip found @ 0x%02x (%s)\n",
205 client->addr << 1, client->adapter->name);
207 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
211 v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
215 /* Initialize wm8775 */
218 wm8775_write(sd, R23, 0x000);
219 /* Disable zero cross detect timeout */
220 wm8775_write(sd, R7, 0x000);
221 /* Left justified, 24-bit mode */
222 wm8775_write(sd, R11, 0x021);
223 /* Master mode, clock ratio 256fs */
224 wm8775_write(sd, R12, 0x102);
226 wm8775_write(sd, R13, 0x000);
227 /* ADC gain +2.5dB, enable zero cross */
228 wm8775_write(sd, R14, 0x1d4);
229 /* ADC gain +2.5dB, enable zero cross */
230 wm8775_write(sd, R15, 0x1d4);
231 /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
232 wm8775_write(sd, R16, 0x1bf);
233 /* Enable gain control, use zero cross detection,
234 ALC hold time 42.6 ms */
235 wm8775_write(sd, R17, 0x185);
236 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
237 wm8775_write(sd, R18, 0x0a2);
238 /* Enable noise gate, threshold -72dBfs */
239 wm8775_write(sd, R19, 0x005);
240 /* Transient window 4ms, lower PGA gain limit -1dB */
241 wm8775_write(sd, R20, 0x07a);
242 /* LRBOTH = 1, use input 2. */
243 wm8775_write(sd, R21, 0x102);
247 static int wm8775_remove(struct i2c_client *client)
249 struct v4l2_subdev *sd = i2c_get_clientdata(client);
251 v4l2_device_unregister_subdev(sd);
256 static const struct i2c_device_id wm8775_id[] = {
260 MODULE_DEVICE_TABLE(i2c, wm8775_id);
262 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
264 .probe = wm8775_probe,
265 .remove = wm8775_remove,
266 .id_table = wm8775_id,