xref: /openbmc/linux/drivers/media/i2c/tlv320aic23b.c (revision aaeb31c0)
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 
to_state(struct v4l2_subdev * sd)35 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
36 {
37 	return container_of(sd, struct tlv320aic23b_state, sd);
38 }
39 
to_sd(struct v4l2_ctrl * ctrl)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 
tlv320aic23b_write(struct v4l2_subdev * sd,int reg,u16 val)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 
tlv320aic23b_s_clock_freq(struct v4l2_subdev * sd,u32 freq)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 
tlv320aic23b_s_ctrl(struct v4l2_ctrl * ctrl)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 
tlv320aic23b_log_status(struct v4l2_subdev * sd)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 
tlv320aic23b_probe(struct i2c_client * client)132 static 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(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(&client->dev, sizeof(*state), GFP_KERNEL);
145 	if (state == NULL)
146 		return -ENOMEM;
147 	sd = &state->sd;
148 	v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
149 
150 	/* Initialize tlv320aic23b */
151 
152 	/* RESET */
153 	tlv320aic23b_write(sd, 15, 0x000);
154 	/* turn off DAC & mic input */
155 	tlv320aic23b_write(sd, 6, 0x00A);
156 	/* left-justified, 24-bit, master mode */
157 	tlv320aic23b_write(sd, 7, 0x049);
158 	/* set gain on both channels to +3.0 dB */
159 	tlv320aic23b_write(sd, 0, 0x119);
160 	/* set sample rate to 48 kHz */
161 	tlv320aic23b_write(sd, 8, 0x000);
162 	/* activate digital interface */
163 	tlv320aic23b_write(sd, 9, 0x001);
164 
165 	v4l2_ctrl_handler_init(&state->hdl, 1);
166 	v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
167 			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
168 	sd->ctrl_handler = &state->hdl;
169 	if (state->hdl.error) {
170 		int err = state->hdl.error;
171 
172 		v4l2_ctrl_handler_free(&state->hdl);
173 		return err;
174 	}
175 	v4l2_ctrl_handler_setup(&state->hdl);
176 	return 0;
177 }
178 
tlv320aic23b_remove(struct i2c_client * client)179 static 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(&state->hdl);
186 }
187 
188 /* ----------------------------------------------------------------------- */
189 
190 static const struct i2c_device_id tlv320aic23b_id[] = {
191 	{ "tlv320aic23b", 0 },
192 	{ }
193 };
194 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
195 
196 static 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 
205 module_i2c_driver(tlv320aic23b_driver);
206