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-rw-r--r--drivers/media/i2c/tea6415c.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/media/i2c/tea6415c.c b/drivers/media/i2c/tea6415c.c
new file mode 100644
index 000000000..50e74314f
--- /dev/null
+++ b/drivers/media/i2c/tea6415c.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+ /*
+ tea6415c - i2c-driver for the tea6415c by SGS Thomson
+
+ Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+ Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
+
+ The tea6415c is a bus controlled video-matrix-switch
+ with 8 inputs and 6 outputs.
+ It is cascadable, i.e. it can be found at the addresses
+ 0x86 and 0x06 on the i2c-bus.
+
+ For detailed information download the specifications directly
+ from SGS Thomson at http://www.st.com
+
+ */
+
+
+#include <linux/module.h>
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <media/v4l2-device.h>
+#include "tea6415c.h"
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tea6415c driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+
+/* makes a connection between the input-pin 'i' and the output-pin 'o' */
+static int tea6415c_s_routing(struct v4l2_subdev *sd,
+ u32 i, u32 o, u32 config)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ u8 byte = 0;
+ int ret;
+
+ v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
+
+ /* check if the pins are valid */
+ if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
+ && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
+ return -EINVAL;
+
+ /* to understand this, have a look at the tea6415c-specs (p.5) */
+ switch (o) {
+ case 18:
+ byte = 0x00;
+ break;
+ case 14:
+ byte = 0x20;
+ break;
+ case 16:
+ byte = 0x10;
+ break;
+ case 17:
+ byte = 0x08;
+ break;
+ case 15:
+ byte = 0x18;
+ break;
+ case 13:
+ byte = 0x28;
+ break;
+ }
+
+ switch (i) {
+ case 5:
+ byte |= 0x00;
+ break;
+ case 8:
+ byte |= 0x04;
+ break;
+ case 3:
+ byte |= 0x02;
+ break;
+ case 20:
+ byte |= 0x06;
+ break;
+ case 6:
+ byte |= 0x01;
+ break;
+ case 10:
+ byte |= 0x05;
+ break;
+ case 1:
+ byte |= 0x03;
+ break;
+ case 11:
+ byte |= 0x07;
+ break;
+ }
+
+ ret = i2c_smbus_write_byte(client, byte);
+ if (ret) {
+ v4l2_dbg(1, debug, sd,
+ "i2c_smbus_write_byte() failed, ret:%d\n", ret);
+ return -EIO;
+ }
+ return ret;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
+ .s_routing = tea6415c_s_routing,
+};
+
+static const struct v4l2_subdev_ops tea6415c_ops = {
+ .video = &tea6415c_video_ops,
+};
+
+static int tea6415c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct v4l2_subdev *sd;
+
+ /* let's see whether this adapter can support what we need */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
+ return -EIO;
+
+ v4l_info(client, "chip found @ 0x%x (%s)\n",
+ client->addr << 1, client->adapter->name);
+ sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
+ if (sd == NULL)
+ return -ENOMEM;
+ v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
+ return 0;
+}
+
+static void tea6415c_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+}
+
+static const struct i2c_device_id tea6415c_id[] = {
+ { "tea6415c", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tea6415c_id);
+
+static struct i2c_driver tea6415c_driver = {
+ .driver = {
+ .name = "tea6415c",
+ },
+ .probe = tea6415c_probe,
+ .remove = tea6415c_remove,
+ .id_table = tea6415c_id,
+};
+
+module_i2c_driver(tea6415c_driver);