diff options
Diffstat (limited to 'drivers/media/i2c/tlv320aic23b.c')
| -rw-r--r-- | drivers/media/i2c/tlv320aic23b.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/media/i2c/tlv320aic23b.c b/drivers/media/i2c/tlv320aic23b.c new file mode 100644 index 000000000000..809a75a558ee --- /dev/null +++ b/drivers/media/i2c/tlv320aic23b.c @@ -0,0 +1,230 @@ +/* + * 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, +}; + +module_i2c_driver(tlv320aic23b_driver); |