2 * tlv320aic23b - driver version 0.0.1
4 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
6 * Based on wm8775 driver
8 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
9 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/ioctl.h>
29 #include <asm/uaccess.h>
30 #include <linux/i2c.h>
31 #include <linux/i2c-id.h>
32 #include <linux/videodev2.h>
33 #include <media/v4l2-device.h>
34 #include <media/v4l2-i2c-drv.h>
36 MODULE_DESCRIPTION("tlv320aic23b driver");
37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38 MODULE_LICENSE("GPL");
41 /* ----------------------------------------------------------------------- */
43 struct tlv320aic23b_state {
44 struct v4l2_subdev sd;
48 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
50 return container_of(sd, struct tlv320aic23b_state, sd);
53 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
55 struct i2c_client *client = v4l2_get_subdevdata(sd);
58 if ((reg < 0 || reg > 9) && (reg != 15)) {
59 v4l2_err(sd, "Invalid register R%d\n", reg);
63 for (i = 0; i < 3; i++)
64 if (i2c_smbus_write_byte_data(client,
65 (reg << 1) | (val >> 8), val & 0xff) == 0)
67 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
71 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
74 case 32000: /* set sample rate to 32 kHz */
75 tlv320aic23b_write(sd, 8, 0x018);
77 case 44100: /* set sample rate to 44.1 kHz */
78 tlv320aic23b_write(sd, 8, 0x022);
80 case 48000: /* set sample rate to 48 kHz */
81 tlv320aic23b_write(sd, 8, 0x000);
89 static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
91 struct tlv320aic23b_state *state = to_state(sd);
93 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
95 ctrl->value = state->muted;
99 static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
101 struct tlv320aic23b_state *state = to_state(sd);
103 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
105 state->muted = ctrl->value;
106 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
107 /* set gain on both channels to +3.0 dB */
109 tlv320aic23b_write(sd, 0, 0x119);
113 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
115 struct tlv320aic23b_state *state = to_state(sd);
117 v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
121 static int tlv320aic23b_command(struct i2c_client *client, unsigned cmd, void *arg)
123 return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
126 /* ----------------------------------------------------------------------- */
128 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
129 .log_status = tlv320aic23b_log_status,
130 .g_ctrl = tlv320aic23b_g_ctrl,
131 .s_ctrl = tlv320aic23b_s_ctrl,
134 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
135 .s_clock_freq = tlv320aic23b_s_clock_freq,
138 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
139 .core = &tlv320aic23b_core_ops,
140 .audio = &tlv320aic23b_audio_ops,
143 /* ----------------------------------------------------------------------- */
145 /* i2c implementation */
149 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
152 static int tlv320aic23b_probe(struct i2c_client *client,
153 const struct i2c_device_id *id)
155 struct tlv320aic23b_state *state;
156 struct v4l2_subdev *sd;
158 /* Check if the adapter supports the needed features */
159 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
162 v4l_info(client, "chip found @ 0x%x (%s)\n",
163 client->addr << 1, client->adapter->name);
165 state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
169 v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
172 /* Initialize tlv320aic23b */
175 tlv320aic23b_write(sd, 15, 0x000);
176 /* turn off DAC & mic input */
177 tlv320aic23b_write(sd, 6, 0x00A);
178 /* left-justified, 24-bit, master mode */
179 tlv320aic23b_write(sd, 7, 0x049);
180 /* set gain on both channels to +3.0 dB */
181 tlv320aic23b_write(sd, 0, 0x119);
182 /* set sample rate to 48 kHz */
183 tlv320aic23b_write(sd, 8, 0x000);
184 /* activate digital interface */
185 tlv320aic23b_write(sd, 9, 0x001);
189 static int tlv320aic23b_remove(struct i2c_client *client)
191 struct v4l2_subdev *sd = i2c_get_clientdata(client);
193 v4l2_device_unregister_subdev(sd);
198 /* ----------------------------------------------------------------------- */
200 static const struct i2c_device_id tlv320aic23b_id[] = {
201 { "tlv320aic23b", 0 },
204 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
206 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
207 .name = "tlv320aic23b",
208 .command = tlv320aic23b_command,
209 .probe = tlv320aic23b_probe,
210 .remove = tlv320aic23b_remove,
211 .id_table = tlv320aic23b_id,