Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / media / i2c / tea6415c.c

diff --git a/kernel/drivers/media/i2c/tea6415c.c b/kernel/drivers/media/i2c/tea6415c.c
new file mode 100644 (file)
index 0000000..bbe1a99
--- /dev/null
+++ b/kernel/drivers/media/i2c/tea6415c.c
@@ -0,0 +1,173 @@
+ /*
+    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 informations download the specifications directly
+    from SGS Thomson at http://www.st.com
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License vs published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
+  */
+
+
+#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 int tea6415c_remove(struct i2c_client *client)
+{
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+       v4l2_device_unregister_subdev(sd);
+       return 0;
+}
+
+static const struct i2c_device_id tea6415c_id[] = {
+       { "tea6415c", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, tea6415c_id);
+
+static struct i2c_driver tea6415c_driver = {
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "tea6415c",
+       },
+       .probe          = tea6415c_probe,
+       .remove         = tea6415c_remove,
+       .id_table       = tea6415c_id,
+};
+
+module_i2c_driver(tea6415c_driver);