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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>
159 lines
3.3 KiB
C
159 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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tea6415c - i2c-driver for the tea6415c 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 tea6415c is a bus controlled video-matrix-switch
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with 8 inputs and 6 outputs.
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It is cascadable, i.e. it can be found at the addresses
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0x86 and 0x06 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 "tea6415c.h"
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tea6415c 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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/* makes a connection between the input-pin 'i' and the output-pin 'o' */
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static int tea6415c_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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u8 byte = 0;
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int ret;
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v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
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/* check if the pins are valid */
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if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
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&& (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
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return -EINVAL;
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/* to understand this, have a look at the tea6415c-specs (p.5) */
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switch (o) {
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case 18:
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byte = 0x00;
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break;
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case 14:
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byte = 0x20;
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break;
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case 16:
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byte = 0x10;
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break;
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case 17:
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byte = 0x08;
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break;
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case 15:
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byte = 0x18;
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break;
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case 13:
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byte = 0x28;
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break;
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}
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switch (i) {
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case 5:
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byte |= 0x00;
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break;
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case 8:
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byte |= 0x04;
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break;
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case 3:
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byte |= 0x02;
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break;
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case 20:
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byte |= 0x06;
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break;
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case 6:
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byte |= 0x01;
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break;
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case 10:
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byte |= 0x05;
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break;
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case 1:
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byte |= 0x03;
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break;
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case 11:
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byte |= 0x07;
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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 ret;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
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.s_routing = tea6415c_s_routing,
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};
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static const struct v4l2_subdev_ops tea6415c_ops = {
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.video = &tea6415c_video_ops,
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};
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static int tea6415c_probe(struct i2c_client *client)
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{
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struct v4l2_subdev *sd;
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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, &tea6415c_ops);
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return 0;
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}
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static void tea6415c_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 tea6415c_id[] = {
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{ .name = "tea6415c" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tea6415c_id);
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static struct i2c_driver tea6415c_driver = {
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.driver = {
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.name = "tea6415c",
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},
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.probe = tea6415c_probe,
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.remove = tea6415c_remove,
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.id_table = tea6415c_id,
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};
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module_i2c_driver(tea6415c_driver);
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