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