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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * tlv320aic23b - driver version 0.0.14 *5 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>6 *7 * Based on wm8775 driver8 *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				(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 probe129 * 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);206