diff options
Diffstat (limited to 'drivers/media/video/tlv320aic23b.c')
| -rw-r--r-- | drivers/media/video/tlv320aic23b.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/media/video/tlv320aic23b.c b/drivers/media/video/tlv320aic23b.c new file mode 100644 index 0000000..281065b --- /dev/null +++ b/drivers/media/video/tlv320aic23b.c @@ -0,0 +1,183 @@ +/* + * 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/ioctl.h> +#include <asm/uaccess.h> +#include <linux/i2c.h> +#include <linux/i2c-id.h> +#include <linux/videodev2.h> +#include <media/v4l2-common.h> +#include <media/v4l2-i2c-drv-legacy.h> + +MODULE_DESCRIPTION("tlv320aic23b driver"); +MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil"); +MODULE_LICENSE("GPL"); + +static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END }; + +I2C_CLIENT_INSMOD; + +/* ----------------------------------------------------------------------- */ + +struct tlv320aic23b_state { + u8 muted; +}; + +static int tlv320aic23b_write(struct i2c_client *client, int reg, u16 val) +{ + int i; + + if ((reg < 0 || reg > 9) && (reg != 15)) { + v4l_err(client, "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; + v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg); + return -1; +} + +static int tlv320aic23b_command(struct i2c_client *client, + unsigned int cmd, void *arg) +{ + struct tlv320aic23b_state *state = i2c_get_clientdata(client); + struct v4l2_control *ctrl = arg; + u32 *freq = arg; + + switch (cmd) { + case VIDIOC_INT_AUDIO_CLOCK_FREQ: + switch (*freq) { + case 32000: /* set sample rate to 32 kHz */ + tlv320aic23b_write(client, 8, 0x018); + break; + case 44100: /* set sample rate to 44.1 kHz */ + tlv320aic23b_write(client, 8, 0x022); + break; + case 48000: /* set sample rate to 48 kHz */ + tlv320aic23b_write(client, 8, 0x000); + break; + default: + return -EINVAL; + } + break; + + case VIDIOC_G_CTRL: + if (ctrl->id != V4L2_CID_AUDIO_MUTE) + return -EINVAL; + ctrl->value = state->muted; + break; + + case VIDIOC_S_CTRL: + if (ctrl->id != V4L2_CID_AUDIO_MUTE) + return -EINVAL; + state->muted = ctrl->value; + tlv320aic23b_write(client, 0, 0x180); /* mute both channels */ + /* set gain on both channels to +3.0 dB */ + if (!state->muted) + tlv320aic23b_write(client, 0, 0x119); + break; + + case VIDIOC_LOG_STATUS: + v4l_info(client, "Input: %s\n", + state->muted ? "muted" : "active"); + break; + + default: + return -EINVAL; + } + return 0; +} + +/* ----------------------------------------------------------------------- */ + +/* 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; + + /* 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 = kmalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + state->muted = 0; + i2c_set_clientdata(client, state); + + /* Initialize tlv320aic23b */ + + /* RESET */ + tlv320aic23b_write(client, 15, 0x000); + /* turn off DAC & mic input */ + tlv320aic23b_write(client, 6, 0x00A); + /* left-justified, 24-bit, master mode */ + tlv320aic23b_write(client, 7, 0x049); + /* set gain on both channels to +3.0 dB */ + tlv320aic23b_write(client, 0, 0x119); + /* set sample rate to 48 kHz */ + tlv320aic23b_write(client, 8, 0x000); + /* activate digital interface */ + tlv320aic23b_write(client, 9, 0x001); + return 0; +} + +static int tlv320aic23b_remove(struct i2c_client *client) +{ + kfree(i2c_get_clientdata(client)); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct i2c_device_id tlv320aic23b_id[] = { + { "tlv320aic23b", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id); + +static struct v4l2_i2c_driver_data v4l2_i2c_data = { + .name = "tlv320aic23b", + .driverid = I2C_DRIVERID_TLV320AIC23B, + .command = tlv320aic23b_command, + .probe = tlv320aic23b_probe, + .remove = tlv320aic23b_remove, + .id_table = tlv320aic23b_id, +}; |
