1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/media/video/hdpvr/hdpvr-i2c.c b/drivers/media/video/hdpvr/hdpvr-i2c.c
new file mode 100644
index 00000000000..c4b5d1515c1
--- /dev/null
+++ b/drivers/media/video/hdpvr/hdpvr-i2c.c
@@ -0,0 +1,145 @@
+
+/*
+ * Hauppauge HD PVR USB driver
+ *
+ * Copyright (C) 2008      Janne Grunau (j@jannau.net)
+ *
+ *	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, version 2.
+ *
+ */
+
+#include <linux/i2c.h>
+
+#include "hdpvr.h"
+
+#define CTRL_READ_REQUEST	0xb8
+#define CTRL_WRITE_REQUEST	0x38
+
+#define REQTYPE_I2C_READ	0xb1
+#define REQTYPE_I2C_WRITE	0xb0
+#define REQTYPE_I2C_WRITE_STATT	0xd0
+
+static int hdpvr_i2c_read(struct hdpvr_device *dev, unsigned char addr,
+			  char *data, int len)
+{
+	int ret;
+	char *buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = usb_control_msg(dev->udev,
+			      usb_rcvctrlpipe(dev->udev, 0),
+			      REQTYPE_I2C_READ, CTRL_READ_REQUEST,
+			      0x100|addr, 0, buf, len, 1000);
+
+	if (ret == len) {
+		memcpy(data, buf, len);
+		ret = 0;
+	} else if (ret >= 0)
+		ret = -EIO;
+
+	kfree(buf);
+
+	return ret;
+}
+
+static int hdpvr_i2c_write(struct hdpvr_device *dev, unsigned char addr,
+			   char *data, int len)
+{
+	int ret;
+	char *buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	memcpy(buf, data, len);
+	ret = usb_control_msg(dev->udev,
+			      usb_sndctrlpipe(dev->udev, 0),
+			      REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
+			      0x100|addr, 0, buf, len, 1000);
+
+	if (ret < 0)
+		goto error;
+
+	ret = usb_control_msg(dev->udev,
+			      usb_rcvctrlpipe(dev->udev, 0),
+			      REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
+			      0, 0, buf, 2, 1000);
+
+	if (ret == 2)
+		ret = 0;
+	else if (ret >= 0)
+		ret = -EIO;
+
+error:
+	kfree(buf);
+	return ret;
+}
+
+static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
+			  int num)
+{
+	struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
+	int retval = 0, i, addr;
+
+	if (num <= 0)
+		return 0;
+
+	mutex_lock(&dev->i2c_mutex);
+
+	for (i = 0; i < num && !retval; i++) {
+		addr = msgs[i].addr << 1;
+
+		if (msgs[i].flags & I2C_M_RD)
+			retval = hdpvr_i2c_read(dev, addr, msgs[i].buf,
+						msgs[i].len);
+		else
+			retval = hdpvr_i2c_write(dev, addr, msgs[i].buf,
+						 msgs[i].len);
+	}
+
+	mutex_unlock(&dev->i2c_mutex);
+
+	return retval ? retval : num;
+}
+
+static u32 hdpvr_functionality(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm hdpvr_algo = {
+	.master_xfer   = hdpvr_transfer,
+	.functionality = hdpvr_functionality,
+};
+
+int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
+{
+	struct i2c_adapter *i2c_adap;
+	int retval = -ENOMEM;
+
+	i2c_adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+	if (i2c_adap == NULL)
+		goto error;
+
+	strlcpy(i2c_adap->name, "Hauppauge HD PVR I2C",
+		sizeof(i2c_adap->name));
+	i2c_adap->algo  = &hdpvr_algo;
+	i2c_adap->class = I2C_CLASS_TV_ANALOG;
+	i2c_adap->id    = I2C_HW_B_HDPVR;
+	i2c_adap->owner = THIS_MODULE;
+	i2c_adap->dev.parent = &dev->udev->dev;
+
+	i2c_set_adapdata(i2c_adap, dev);
+
+	retval = i2c_add_adapter(i2c_adap);
+
+	if (!retval)
+		dev->i2c_adapter = i2c_adap;
+	else
+		kfree(i2c_adap);
+
+error:
+	return retval;
+}