Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / media / i2c / uda1342.c

diff --git a/kernel/drivers/media/i2c/uda1342.c b/kernel/drivers/media/i2c/uda1342.c
new file mode 100644 (file)
index 0000000..081786d
--- /dev/null
+++ b/kernel/drivers/media/i2c/uda1342.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/uda1342.h>
+#include <linux/slab.h>
+
+static int write_reg(struct i2c_client *client, int reg, int value)
+{
+       /* UDA1342 wants MSB first, but SMBus sends LSB first */
+       i2c_smbus_write_word_data(client, reg, swab16(value));
+       return 0;
+}
+
+static int uda1342_s_routing(struct v4l2_subdev *sd,
+               u32 input, u32 output, u32 config)
+{
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+       switch (input) {
+       case UDA1342_IN1:
+               write_reg(client, 0x00, 0x1241); /* select input 1 */
+               break;
+       case UDA1342_IN2:
+               write_reg(client, 0x00, 0x1441); /* select input 2 */
+               break;
+       default:
+               v4l2_err(sd, "input %d not supported\n", input);
+               break;
+       }
+       return 0;
+}
+
+static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
+       .s_routing = uda1342_s_routing,
+};
+
+static const struct v4l2_subdev_ops uda1342_ops = {
+       .audio = &uda1342_audio_ops,
+};
+
+static int uda1342_probe(struct i2c_client *client,
+                            const struct i2c_device_id *id)
+{
+       struct i2c_adapter *adapter = client->adapter;
+       struct v4l2_subdev *sd;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
+               return -ENODEV;
+
+       dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
+               client->addr, adapter->name);
+
+       sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
+       if (sd == NULL)
+               return -ENOMEM;
+
+       v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
+
+       write_reg(client, 0x00, 0x8000); /* reset registers */
+       write_reg(client, 0x00, 0x1241); /* select input 1 */
+
+       v4l_info(client, "chip found @ 0x%02x (%s)\n",
+                       client->addr << 1, client->adapter->name);
+
+       return 0;
+}
+
+static int uda1342_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 uda1342_id[] = {
+       { "uda1342", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, uda1342_id);
+
+static struct i2c_driver uda1342_driver = {
+       .driver = {
+               .name   = "uda1342",
+       },
+       .probe          = uda1342_probe,
+       .remove         = uda1342_remove,
+       .id_table       = uda1342_id,
+};
+
+module_i2c_driver(uda1342_driver);
+
+MODULE_LICENSE("GPL v2");