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path: root/drivers/media/i2c/cs3308.c
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Diffstat (limited to 'drivers/media/i2c/cs3308.c')
-rw-r--r--drivers/media/i2c/cs3308.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/media/i2c/cs3308.c b/drivers/media/i2c/cs3308.c
new file mode 100644
index 000000000..d28b4f37f
--- /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);