229 строки
6.1 KiB
C
229 строки
6.1 KiB
C
/*
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* tlv320aic23b - driver version 0.0.1
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*
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* Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
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*
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* Based on wm8775 driver
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*
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* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
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* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/ioctl.h>
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#include <asm/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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MODULE_DESCRIPTION("tlv320aic23b driver");
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MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
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MODULE_LICENSE("GPL");
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/* ----------------------------------------------------------------------- */
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struct tlv320aic23b_state {
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struct v4l2_subdev sd;
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struct v4l2_ctrl_handler hdl;
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};
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static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct tlv320aic23b_state, sd);
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}
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static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
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{
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return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
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}
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static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int i;
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if ((reg < 0 || reg > 9) && (reg != 15)) {
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v4l2_err(sd, "Invalid register R%d\n", reg);
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return -1;
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}
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for (i = 0; i < 3; i++)
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if (i2c_smbus_write_byte_data(client,
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(reg << 1) | (val >> 8), val & 0xff) == 0)
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return 0;
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v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
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return -1;
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}
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static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
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{
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switch (freq) {
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case 32000: /* set sample rate to 32 kHz */
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tlv320aic23b_write(sd, 8, 0x018);
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break;
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case 44100: /* set sample rate to 44.1 kHz */
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tlv320aic23b_write(sd, 8, 0x022);
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break;
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case 48000: /* set sample rate to 48 kHz */
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tlv320aic23b_write(sd, 8, 0x000);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct v4l2_subdev *sd = to_sd(ctrl);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
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/* set gain on both channels to +3.0 dB */
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if (!ctrl->val)
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tlv320aic23b_write(sd, 0, 0x119);
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return 0;
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}
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return -EINVAL;
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}
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static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
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{
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struct tlv320aic23b_state *state = to_state(sd);
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v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
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.s_ctrl = tlv320aic23b_s_ctrl,
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};
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static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
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.log_status = tlv320aic23b_log_status,
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.g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
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.try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
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.s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
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.g_ctrl = v4l2_subdev_g_ctrl,
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.s_ctrl = v4l2_subdev_s_ctrl,
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.queryctrl = v4l2_subdev_queryctrl,
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.querymenu = v4l2_subdev_querymenu,
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};
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static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
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.s_clock_freq = tlv320aic23b_s_clock_freq,
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};
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static const struct v4l2_subdev_ops tlv320aic23b_ops = {
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.core = &tlv320aic23b_core_ops,
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.audio = &tlv320aic23b_audio_ops,
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};
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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/*
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* Generic i2c probe
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* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
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*/
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static int tlv320aic23b_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tlv320aic23b_state *state;
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struct v4l2_subdev *sd;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
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/* Initialize tlv320aic23b */
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/* RESET */
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tlv320aic23b_write(sd, 15, 0x000);
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/* turn off DAC & mic input */
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tlv320aic23b_write(sd, 6, 0x00A);
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/* left-justified, 24-bit, master mode */
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tlv320aic23b_write(sd, 7, 0x049);
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/* set gain on both channels to +3.0 dB */
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tlv320aic23b_write(sd, 0, 0x119);
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/* set sample rate to 48 kHz */
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tlv320aic23b_write(sd, 8, 0x000);
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/* activate digital interface */
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tlv320aic23b_write(sd, 9, 0x001);
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v4l2_ctrl_handler_init(&state->hdl, 1);
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v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
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sd->ctrl_handler = &state->hdl;
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if (state->hdl.error) {
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int err = state->hdl.error;
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v4l2_ctrl_handler_free(&state->hdl);
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return err;
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}
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v4l2_ctrl_handler_setup(&state->hdl);
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return 0;
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}
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static int tlv320aic23b_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct tlv320aic23b_state *state = to_state(sd);
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v4l2_device_unregister_subdev(sd);
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v4l2_ctrl_handler_free(&state->hdl);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id tlv320aic23b_id[] = {
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{ "tlv320aic23b", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
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static struct i2c_driver tlv320aic23b_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "tlv320aic23b",
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},
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.probe = tlv320aic23b_probe,
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.remove = tlv320aic23b_remove,
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.id_table = tlv320aic23b_id,
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};
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module_i2c_driver(tlv320aic23b_driver);
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