treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / media / i2c / tlv320aic23b.c
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
23 MODULE_DESCRIPTION("tlv320aic23b driver");
24 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
25 MODULE_LICENSE("GPL");
26
27
28 /* ----------------------------------------------------------------------- */
29
30 struct tlv320aic23b_state {
31         struct v4l2_subdev sd;
32         struct v4l2_ctrl_handler hdl;
33 };
34
35 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
36 {
37         return container_of(sd, struct tlv320aic23b_state, sd);
38 }
39
40 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
41 {
42         return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
43 }
44
45 static 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                                 (reg << 1) | (val >> 8), 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
63 static 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, 8, 0x018);
68                 break;
69         case 44100: /* set sample rate to 44.1 kHz */
70                 tlv320aic23b_write(sd, 8, 0x022);
71                 break;
72         case 48000: /* set sample rate to 48 kHz */
73                 tlv320aic23b_write(sd, 8, 0x000);
74                 break;
75         default:
76                 return -EINVAL;
77         }
78         return 0;
79 }
80
81 static 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, 0, 0x180); /* mute both channels */
88                 /* set gain on both channels to +3.0 dB */
89                 if (!ctrl->val)
90                         tlv320aic23b_write(sd, 0, 0x119);
91                 return 0;
92         }
93         return -EINVAL;
94 }
95
96 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
97 {
98         struct tlv320aic23b_state *state = to_state(sd);
99
100         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
101         return 0;
102 }
103
104 /* ----------------------------------------------------------------------- */
105
106 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
107         .s_ctrl = tlv320aic23b_s_ctrl,
108 };
109
110 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
111         .log_status = tlv320aic23b_log_status,
112 };
113
114 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
115         .s_clock_freq = tlv320aic23b_s_clock_freq,
116 };
117
118 static 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
132 static int tlv320aic23b_probe(struct i2c_client *client,
133                               const struct i2c_device_id *id)
134 {
135         struct tlv320aic23b_state *state;
136         struct v4l2_subdev *sd;
137
138         /* Check if the adapter supports the needed features */
139         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
140                 return -EIO;
141
142         v4l_info(client, "chip found @ 0x%x (%s)\n",
143                         client->addr << 1, client->adapter->name);
144
145         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
146         if (state == NULL)
147                 return -ENOMEM;
148         sd = &state->sd;
149         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
150
151         /* Initialize tlv320aic23b */
152
153         /* RESET */
154         tlv320aic23b_write(sd, 15, 0x000);
155         /* turn off DAC & mic input */
156         tlv320aic23b_write(sd, 6, 0x00A);
157         /* left-justified, 24-bit, master mode */
158         tlv320aic23b_write(sd, 7, 0x049);
159         /* set gain on both channels to +3.0 dB */
160         tlv320aic23b_write(sd, 0, 0x119);
161         /* set sample rate to 48 kHz */
162         tlv320aic23b_write(sd, 8, 0x000);
163         /* activate digital interface */
164         tlv320aic23b_write(sd, 9, 0x001);
165
166         v4l2_ctrl_handler_init(&state->hdl, 1);
167         v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
168                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
169         sd->ctrl_handler = &state->hdl;
170         if (state->hdl.error) {
171                 int err = state->hdl.error;
172
173                 v4l2_ctrl_handler_free(&state->hdl);
174                 return err;
175         }
176         v4l2_ctrl_handler_setup(&state->hdl);
177         return 0;
178 }
179
180 static int tlv320aic23b_remove(struct i2c_client *client)
181 {
182         struct v4l2_subdev *sd = i2c_get_clientdata(client);
183         struct tlv320aic23b_state *state = to_state(sd);
184
185         v4l2_device_unregister_subdev(sd);
186         v4l2_ctrl_handler_free(&state->hdl);
187         return 0;
188 }
189
190 /* ----------------------------------------------------------------------- */
191
192 static const struct i2c_device_id tlv320aic23b_id[] = {
193         { "tlv320aic23b", 0 },
194         { }
195 };
196 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
197
198 static struct i2c_driver tlv320aic23b_driver = {
199         .driver = {
200                 .name   = "tlv320aic23b",
201         },
202         .probe          = tlv320aic23b_probe,
203         .remove         = tlv320aic23b_remove,
204         .id_table       = tlv320aic23b_id,
205 };
206
207 module_i2c_driver(tlv320aic23b_driver);