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@kernel.org>
 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				(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
 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, 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
 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, 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
 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(&state->hdl, 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(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
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(&state->hdl);
186}
187
188/* ----------------------------------------------------------------------- */
189
190static const struct i2c_device_id tlv320aic23b_id[] = {
191	{ "tlv320aic23b" },
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);