Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / media / i2c / tea6420.c

diff --git a/kernel/drivers/media/i2c/tea6420.c b/kernel/drivers/media/i2c/tea6420.c
new file mode 100644 (file)
index 0000000..30a8d75
--- /dev/null
+++ b/kernel/drivers/media/i2c/tea6420.c
@@ -0,0 +1,155 @@
+ /*
+    tea6420 - i2c-driver for the tea6420 by SGS Thomson
+
+    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
+
+    The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
+    4 stereo outputs and gain control for each output.
+    It is cascadable, i.e. it can be found at the addresses 0x98
+    and 0x9a 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 as 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 Mass 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 "tea6420.h"
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tea6420 driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+
+/* make a connection between the input 'i' and the output 'o'
+   with gain 'g' (note: i = 6 means 'mute') */
+static int tea6420_s_routing(struct v4l2_subdev *sd,
+                            u32 i, u32 o, u32 config)
+{
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
+       int g = (o >> 4) & 0xf;
+       u8 byte;
+       int ret;
+
+       o &= 0xf;
+       v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
+
+       /* check if the parameters are valid */
+       if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
+               return -EINVAL;
+
+       byte = ((o - 1) << 5);
+       byte |= (i - 1);
+
+       /* to understand this, have a look at the tea6420-specs (p.5) */
+       switch (g) {
+       case 0:
+               byte |= (3 << 3);
+               break;
+       case 2:
+               byte |= (2 << 3);
+               break;
+       case 4:
+               byte |= (1 << 3);
+               break;
+       case 6:
+               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 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
+       .s_routing = tea6420_s_routing,
+};
+
+static const struct v4l2_subdev_ops tea6420_ops = {
+       .audio = &tea6420_audio_ops,
+};
+
+static int tea6420_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+       struct v4l2_subdev *sd;
+       int err, i;
+
+       /* 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, &tea6420_ops);
+
+       /* set initial values: set "mute"-input to all outputs at gain 0 */
+       err = 0;
+       for (i = 1; i < 5; i++)
+               err += tea6420_s_routing(sd, 6, i, 0);
+       if (err) {
+               v4l_dbg(1, debug, client, "could not initialize tea6420\n");
+               return -ENODEV;
+       }
+       return 0;
+}
+
+static int tea6420_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 tea6420_id[] = {
+       { "tea6420", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, tea6420_id);
+
+static struct i2c_driver tea6420_driver = {
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "tea6420",
+       },
+       .probe          = tea6420_probe,
+       .remove         = tea6420_remove,
+       .id_table       = tea6420_id,
+};
+
+module_i2c_driver(tea6420_driver);