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142 lines
3.3 KiB
142 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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tea6420 - i2c-driver for the tea6420 by SGS Thomson |
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Copyright (C) 1998-2003 Michael Hunold <[email protected]> |
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Copyright (C) 2008 Hans Verkuil <[email protected]> |
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The tea6420 is a bus controlled audio-matrix with 5 stereo inputs, |
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4 stereo outputs and gain control for each output. |
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It is cascadable, i.e. it can be found at the addresses 0x98 |
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and 0x9a on the i2c-bus. |
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For detailed information download the specifications directly |
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from SGS Thomson at http://www.st.com |
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*/ |
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#include <linux/module.h> |
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#include <linux/ioctl.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <media/v4l2-device.h> |
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#include "tea6420.h" |
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MODULE_AUTHOR("Michael Hunold <[email protected]>"); |
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MODULE_DESCRIPTION("tea6420 driver"); |
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MODULE_LICENSE("GPL"); |
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static int debug; |
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module_param(debug, int, 0644); |
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MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
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/* make a connection between the input 'i' and the output 'o' |
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with gain 'g' (note: i = 6 means 'mute') */ |
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static int tea6420_s_routing(struct v4l2_subdev *sd, |
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u32 i, u32 o, u32 config) |
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{ |
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struct i2c_client *client = v4l2_get_subdevdata(sd); |
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int g = (o >> 4) & 0xf; |
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u8 byte; |
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int ret; |
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o &= 0xf; |
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v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g); |
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/* check if the parameters are valid */ |
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if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) |
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return -EINVAL; |
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byte = ((o - 1) << 5); |
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byte |= (i - 1); |
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/* to understand this, have a look at the tea6420-specs (p.5) */ |
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switch (g) { |
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case 0: |
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byte |= (3 << 3); |
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break; |
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case 2: |
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byte |= (2 << 3); |
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break; |
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case 4: |
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byte |= (1 << 3); |
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break; |
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case 6: |
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break; |
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} |
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ret = i2c_smbus_write_byte(client, byte); |
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if (ret) { |
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v4l2_dbg(1, debug, sd, |
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"i2c_smbus_write_byte() failed, ret:%d\n", ret); |
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return -EIO; |
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} |
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return 0; |
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} |
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/* ----------------------------------------------------------------------- */ |
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static const struct v4l2_subdev_audio_ops tea6420_audio_ops = { |
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.s_routing = tea6420_s_routing, |
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}; |
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static const struct v4l2_subdev_ops tea6420_ops = { |
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.audio = &tea6420_audio_ops, |
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}; |
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static int tea6420_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct v4l2_subdev *sd; |
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int err, i; |
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/* let's see whether this adapter can support what we need */ |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) |
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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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sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
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if (sd == NULL) |
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return -ENOMEM; |
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v4l2_i2c_subdev_init(sd, client, &tea6420_ops); |
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/* set initial values: set "mute"-input to all outputs at gain 0 */ |
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err = 0; |
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for (i = 1; i < 5; i++) |
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err += tea6420_s_routing(sd, 6, i, 0); |
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if (err) { |
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v4l_dbg(1, debug, client, "could not initialize tea6420\n"); |
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return -ENODEV; |
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} |
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return 0; |
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} |
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static int tea6420_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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v4l2_device_unregister_subdev(sd); |
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return 0; |
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} |
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static const struct i2c_device_id tea6420_id[] = { |
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{ "tea6420", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tea6420_id); |
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static struct i2c_driver tea6420_driver = { |
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.driver = { |
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.name = "tea6420", |
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}, |
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.probe = tea6420_probe, |
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.remove = tea6420_remove, |
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.id_table = tea6420_id, |
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}; |
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module_i2c_driver(tea6420_driver);
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