[media] cs3308: add new 8-channel volume control driver

Add simple support for this 8 channel volume control driver.
Currently all it does is to unmute all 8 channels.

Based upon Devin's initial patch made for an older kernel which I
cleaned up and rebased. Thanks to Kernel Labs for that work.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

4 files changed, 158 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index a04279769628..4635e1d14612 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3094,6 +3094,15 @@ S:	Maintained
 F:      crypto/ansi_cprng.c
 F:      crypto/rng.c
 
+CS3308 MEDIA DRIVER
+M:      Hans Verkuil <hverkuil@xs4all.nl>
+L:      linux-media@vger.kernel.org
+T:      git git://linuxtv.org/media_tree.git
+W:      http://linuxtv.org
+S:      Odd Fixes
+F:      drivers/media/i2c/cs3308.c
+F:      drivers/media/i2c/cs3308.h
+
 CS5535 Audio ALSA driver
 M:      Jaya Kumar <jayakumar.alsa@gmail.com>
 S:      Maintained
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 521bbf1b29bc..993dc50c12db 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -83,6 +83,16 @@ config VIDEO_MSP3400
           To compile this driver as a module, choose M here: the
           module will be called msp3400.
 
+config VIDEO_CS3308
+        tristate "Cirrus Logic CS3308 audio ADC"
+        depends on VIDEO_V4L2 && I2C
+        ---help---
+          Support for the Cirrus Logic CS3308 High Performance 8-Channel
+          Analog Volume Control
+
+          To compile this driver as a module, choose M here: the
+          module will be called cs3308.
+
 config VIDEO_CS5345
         tristate "Cirrus Logic CS5345 audio ADC"
         depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 07db257abfc1..94f2c99e890d 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
 obj-$(CONFIG_VIDEO_TW2804) += tw2804.o
 obj-$(CONFIG_VIDEO_TW9903) += tw9903.o
 obj-$(CONFIG_VIDEO_TW9906) += tw9906.o
+obj-$(CONFIG_VIDEO_CS3308) += cs3308.o
 obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o
 obj-$(CONFIG_VIDEO_M52790) += m52790.o
diff --git a/drivers/media/i2c/cs3308.c b/drivers/media/i2c/cs3308.c
new file mode 100644
index 000000000000..d28b4f37fe5f
--- /dev/null
+++ b/drivers/media/i2c/cs3308.c
@@ -0,0 +1,138 @@
+/*
+ * Cirrus Logic cs3308 8-Channel Analog Volume Control
+ *
+ * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
+ * Copyright (C) 2012 Steven Toth <stoth@kernellabs.com>
+ *
+ * Derived from cs5345.c Copyright (C) 2007 Hans Verkuil
+ *
+ * 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.
+ */
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+
+MODULE_DESCRIPTION("i2c device driver for cs3308 8-channel volume control");
+MODULE_AUTHOR("Devin Heitmueller");
+MODULE_LICENSE("GPL");
+
+static inline int cs3308_write(struct v4l2_subdev *sd, u8 reg, u8 value)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static inline int cs3308_read(struct v4l2_subdev *sd, u8 reg)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        return i2c_smbus_read_byte_data(client, reg);
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int cs3308_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
+{
+        reg->val = cs3308_read(sd, reg->reg & 0xffff);
+        reg->size = 1;
+        return 0;
+}
+
+static int cs3308_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
+{
+        cs3308_write(sd, reg->reg & 0xffff, reg->val & 0xff);
+        return 0;
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops cs3308_core_ops = {
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        .g_register = cs3308_g_register,
+        .s_register = cs3308_s_register,
+#endif
+};
+
+static const struct v4l2_subdev_ops cs3308_ops = {
+        .core = &cs3308_core_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int cs3308_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct v4l2_subdev *sd;
+        unsigned i;
+
+        /* Check if the adapter supports the needed features */
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+
+        if ((i2c_smbus_read_byte_data(client, 0x1c) & 0xf0) != 0xe0)
+                return -ENODEV;
+
+        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, &cs3308_ops);
+
+        /* Set some reasonable defaults */
+        cs3308_write(sd, 0x0d, 0x00); /* Power up all channels */
+        cs3308_write(sd, 0x0e, 0x00); /* Master Power */
+        cs3308_write(sd, 0x0b, 0x00); /* Device Configuration */
+        /* Set volume for each channel */
+        for (i = 1; i <= 8; i++)
+                cs3308_write(sd, i, 0xd2);
+        cs3308_write(sd, 0x0a, 0x00); /* Unmute all channels */
+        return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static int cs3308_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 cs3308_id[] = {
+        { "cs3308", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, cs3308_id);
+
+static struct i2c_driver cs3308_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "cs3308",
+        },
+        .probe          = cs3308_probe,
+        .remove         = cs3308_remove,
+        .id_table       = cs3308_id,
+};
+
+module_i2c_driver(cs3308_driver);