diff options
Diffstat (limited to 'drivers/media/i2c/tea6415c.c')
| -rw-r--r-- | drivers/media/i2c/tea6415c.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/media/i2c/tea6415c.c b/drivers/media/i2c/tea6415c.c new file mode 100644 index 0000000000..3ed6e441d5 --- /dev/null +++ b/drivers/media/i2c/tea6415c.c @@ -0,0 +1,158 @@ +// 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) +{ + 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); |