/* * 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 <asm/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, .g_ext_ctrls = v4l2_subdev_g_ext_ctrls, .try_ext_ctrls = v4l2_subdev_try_ext_ctrls, .s_ext_ctrls = v4l2_subdev_s_ext_ctrls, .g_ctrl = v4l2_subdev_g_ctrl, .s_ctrl = v4l2_subdev_s_ctrl, .queryctrl = v4l2_subdev_queryctrl, .querymenu = v4l2_subdev_querymenu, }; 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 = kzalloc(sizeof(struct tlv320aic23b_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); kfree(state); 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); kfree(state); 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 = { .owner = THIS_MODULE, .name = "tlv320aic23b", }, .probe = tlv320aic23b_probe, .remove = tlv320aic23b_remove, .id_table = tlv320aic23b_id, }; static __init int init_tlv320aic23b(void) { return i2c_add_driver(&tlv320aic23b_driver); } static __exit void exit_tlv320aic23b(void) { i2c_del_driver(&tlv320aic23b_driver); } module_init(init_tlv320aic23b); module_exit(exit_tlv320aic23b);