[media] uda1342: add new uda1342 audio codec driver

This based on the wis-uda1342.c driver that's part of the go7007 driver.
It has been converted to a v4l subdev driver by Pete Eberlein, and I made
additional cleanups.
Based on work by: Pete Eberlein <pete@sensoray.com>

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 123 insertions, 0 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 790788597bad..5df353f7c552 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -112,6 +112,15 @@ config VIDEO_TLV320AIC23B
           To compile this driver as a module, choose M here: the
           module will be called tlv320aic23b.
 
+config VIDEO_UDA1342
+        tristate "Philips UDA1342 audio codec"
+        depends on VIDEO_V4L2 && I2C
+        ---help---
+          Support for the Philips UDA1342 audio codec.
+
+          To compile this driver as a module, choose M here: the
+          module will be called uda1342.
+
 config VIDEO_WM8775
         tristate "Wolfson Microelectronics WM8775 audio ADC with input mixer"
         depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index adf950406a94..b1775b3fad04 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o
 obj-$(CONFIG_VIDEO_M52790) += m52790.o
 obj-$(CONFIG_VIDEO_TLV320AIC23B) += tlv320aic23b.o
+obj-$(CONFIG_VIDEO_UDA1342) += uda1342.o
 obj-$(CONFIG_VIDEO_WM8775) += wm8775.o
 obj-$(CONFIG_VIDEO_WM8739) += wm8739.o
 obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
diff --git a/drivers/media/i2c/uda1342.c b/drivers/media/i2c/uda1342.c
new file mode 100644
index 000000000000..3af408556d27
--- /dev/null
+++ b/drivers/media/i2c/uda1342.c
@@ -0,0 +1,113 @@
+/*
+ * 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 = kzalloc(sizeof(struct v4l2_subdev), 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);
+        kfree(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");