1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * tlv320aic23b - driver version 0.0.1
4 *
5 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
6 *
7 * Based on wm8775 driver
8 *
9 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
10 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/slab.h>
16#include <linux/ioctl.h>
17#include <linux/uaccess.h>
18#include <linux/i2c.h>
19#include <linux/videodev2.h>
20#include <media/v4l2-device.h>
21#include <media/v4l2-ctrls.h>
22
23MODULE_DESCRIPTION("tlv320aic23b driver");
24MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
25MODULE_LICENSE("GPL");
26
27
28/* ----------------------------------------------------------------------- */
29
30struct tlv320aic23b_state {
31 struct v4l2_subdev sd;
32 struct v4l2_ctrl_handler hdl;
33};
34
35static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
36{
37 return container_of(sd, struct tlv320aic23b_state, sd);
38}
39
40static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
41{
42 return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
43}
44
45static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
46{
47 struct i2c_client *client = v4l2_get_subdevdata(sd);
48 int i;
49
50 if ((reg < 0 || reg > 9) && (reg != 15)) {
51 v4l2_err(sd, "Invalid register R%d\n", reg);
52 return -1;
53 }
54
55 for (i = 0; i < 3; i++)
56 if (i2c_smbus_write_byte_data(client,
57 command: (reg << 1) | (val >> 8), value: val & 0xff) == 0)
58 return 0;
59 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
60 return -1;
61}
62
63static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
64{
65 switch (freq) {
66 case 32000: /* set sample rate to 32 kHz */
67 tlv320aic23b_write(sd, reg: 8, val: 0x018);
68 break;
69 case 44100: /* set sample rate to 44.1 kHz */
70 tlv320aic23b_write(sd, reg: 8, val: 0x022);
71 break;
72 case 48000: /* set sample rate to 48 kHz */
73 tlv320aic23b_write(sd, reg: 8, val: 0x000);
74 break;
75 default:
76 return -EINVAL;
77 }
78 return 0;
79}
80
81static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
82{
83 struct v4l2_subdev *sd = to_sd(ctrl);
84
85 switch (ctrl->id) {
86 case V4L2_CID_AUDIO_MUTE:
87 tlv320aic23b_write(sd, reg: 0, val: 0x180); /* mute both channels */
88 /* set gain on both channels to +3.0 dB */
89 if (!ctrl->val)
90 tlv320aic23b_write(sd, reg: 0, val: 0x119);
91 return 0;
92 }
93 return -EINVAL;
94}
95
96static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
97{
98 struct tlv320aic23b_state *state = to_state(sd);
99
100 v4l2_ctrl_handler_log_status(hdl: &state->hdl, prefix: sd->name);
101 return 0;
102}
103
104/* ----------------------------------------------------------------------- */
105
106static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
107 .s_ctrl = tlv320aic23b_s_ctrl,
108};
109
110static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
111 .log_status = tlv320aic23b_log_status,
112};
113
114static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
115 .s_clock_freq = tlv320aic23b_s_clock_freq,
116};
117
118static const struct v4l2_subdev_ops tlv320aic23b_ops = {
119 .core = &tlv320aic23b_core_ops,
120 .audio = &tlv320aic23b_audio_ops,
121};
122
123/* ----------------------------------------------------------------------- */
124
125/* i2c implementation */
126
127/*
128 * Generic i2c probe
129 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
130 */
131
132static int tlv320aic23b_probe(struct i2c_client *client)
133{
134 struct tlv320aic23b_state *state;
135 struct v4l2_subdev *sd;
136
137 /* Check if the adapter supports the needed features */
138 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
139 return -EIO;
140
141 v4l_info(client, "chip found @ 0x%x (%s)\n",
142 client->addr << 1, client->adapter->name);
143
144 state = devm_kzalloc(dev: &client->dev, size: sizeof(*state), GFP_KERNEL);
145 if (state == NULL)
146 return -ENOMEM;
147 sd = &state->sd;
148 v4l2_i2c_subdev_init(sd, client, ops: &tlv320aic23b_ops);
149
150 /* Initialize tlv320aic23b */
151
152 /* RESET */
153 tlv320aic23b_write(sd, reg: 15, val: 0x000);
154 /* turn off DAC & mic input */
155 tlv320aic23b_write(sd, reg: 6, val: 0x00A);
156 /* left-justified, 24-bit, master mode */
157 tlv320aic23b_write(sd, reg: 7, val: 0x049);
158 /* set gain on both channels to +3.0 dB */
159 tlv320aic23b_write(sd, reg: 0, val: 0x119);
160 /* set sample rate to 48 kHz */
161 tlv320aic23b_write(sd, reg: 8, val: 0x000);
162 /* activate digital interface */
163 tlv320aic23b_write(sd, reg: 9, val: 0x001);
164
165 v4l2_ctrl_handler_init(&state->hdl, 1);
166 v4l2_ctrl_new_std(hdl: &state->hdl, ops: &tlv320aic23b_ctrl_ops,
167 V4L2_CID_AUDIO_MUTE, min: 0, max: 1, step: 1, def: 0);
168 sd->ctrl_handler = &state->hdl;
169 if (state->hdl.error) {
170 int err = state->hdl.error;
171
172 v4l2_ctrl_handler_free(hdl: &state->hdl);
173 return err;
174 }
175 v4l2_ctrl_handler_setup(hdl: &state->hdl);
176 return 0;
177}
178
179static void tlv320aic23b_remove(struct i2c_client *client)
180{
181 struct v4l2_subdev *sd = i2c_get_clientdata(client);
182 struct tlv320aic23b_state *state = to_state(sd);
183
184 v4l2_device_unregister_subdev(sd);
185 v4l2_ctrl_handler_free(hdl: &state->hdl);
186}
187
188/* ----------------------------------------------------------------------- */
189
190static const struct i2c_device_id tlv320aic23b_id[] = {
191 { "tlv320aic23b", 0 },
192 { }
193};
194MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
195
196static struct i2c_driver tlv320aic23b_driver = {
197 .driver = {
198 .name = "tlv320aic23b",
199 },
200 .probe = tlv320aic23b_probe,
201 .remove = tlv320aic23b_remove,
202 .id_table = tlv320aic23b_id,
203};
204
205module_i2c_driver(tlv320aic23b_driver);
206

source code of linux/drivers/media/i2c/tlv320aic23b.c