1 files changed, 187 insertions, 0 deletions

diff --git a/drivers/media/i2c/tea6415c.c b/drivers/media/i2c/tea6415c.c
new file mode 100644
index 000000000000..d1d6ea1dd273
--- /dev/null
+++ b/drivers/media/i2c/tea6415c.c
@@ -0,0 +1,187 @@
+ /*
+    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 <media/v4l2-chip-ident.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 int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
+        .g_chip_ident = tea6415c_g_chip_ident,
+};
+
+static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
+        .s_routing = tea6415c_s_routing,
+};
+
+static const struct v4l2_subdev_ops tea6415c_ops = {
+        .core = &tea6415c_core_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 = kzalloc(sizeof(struct v4l2_subdev), 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);
+        kfree(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);