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2958d579ff
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify usage of whitespace and commas. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
// 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 <michael@mihu.de>
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Copyright (C) 2008 Hans Verkuil <hverkuil@kernel.org>
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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 <michael@mihu.de>");
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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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{
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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 void 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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}
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static const struct i2c_device_id tea6420_id[] = {
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{ .name = "tea6420" },
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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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