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// SPDX-License-Identifier: GPL-2.0-only
/*
* Hauppauge HD PVR USB driver
*
* Copyright (C) 2008 Janne Grunau (j@jannau.net)
*
* IR device registration code is
* Copyright (C) 2010 Andy Walls <awalls@md.metrocast.net>
*/
#if IS_ENABLED(CONFIG_I2C)
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.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
#define Z8F0811_IR_TX_I2C_ADDR 0x70
#define Z8F0811_IR_RX_I2C_ADDR 0x71
struct i2c_client *hdpvr_register_ir_i2c(struct hdpvr_device *dev)
{
struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
struct i2c_board_info info = {
I2C_BOARD_INFO("ir_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR),
};
/* Our default information for ir-kbd-i2c.c to use */
init_data->ir_codes = RC_MAP_HAUPPAUGE;
init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
RC_PROTO_BIT_RC6_6A_32;
init_data->name = "HD-PVR";
init_data->polling_interval = 405; /* ms, duplicated from Windows */
info.platform_data = init_data;
return i2c_new_device(&dev->i2c_adapter, &info);
}
static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
unsigned char addr, char *wdata, int wlen,
char *data, int len)
{
int ret;
if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
return -EINVAL;
if (wlen) {
memcpy(dev->i2c_buf, wdata, wlen);
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
(bus << 8) | addr, 0, dev->i2c_buf,
wlen, 1000);
if (ret < 0)
return ret;
}
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
REQTYPE_I2C_READ, CTRL_READ_REQUEST,
(bus << 8) | addr, 0, dev->i2c_buf, len, 1000);
if (ret == len) {
memcpy(data, dev->i2c_buf, len);
ret = 0;
} else if (ret >= 0)
ret = -EIO;
return ret;
}
static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
unsigned char addr, char *data, int len)
{
int ret;
if (len > sizeof(dev->i2c_buf))
return -EINVAL;
memcpy(dev->i2c_buf, data, len);
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
(bus << 8) | addr, 0, dev->i2c_buf, len, 1000);
if (ret < 0)
return ret;
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
0, 0, dev->i2c_buf, 2, 1000);
if ((ret == 2) && (dev->i2c_buf[1] == (len - 1)))
ret = 0;
else if (ret >= 0)
ret = -EIO;
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, addr;
mutex_lock(&dev->i2c_mutex);
addr = msgs[0].addr << 1;
if (num == 1) {
if (msgs[0].flags & I2C_M_RD)
retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0,
msgs[0].buf, msgs[0].len);
else
retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf,
msgs[0].len);
} else if (num == 2) {
if (msgs[0].addr != msgs[1].addr) {
v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer with conflicting target addresses\n");
retval = -EINVAL;
goto out;
}
if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) {
v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with r0=%d, r1=%d\n",
msgs[0].flags & I2C_M_RD,
msgs[1].flags & I2C_M_RD);
retval = -EINVAL;
goto out;
}
/*
* Write followed by atomic read is the only complex xfer that
* we actually support here.
*/
retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len,
msgs[1].buf, msgs[1].len);
} else {
v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num);
}
out:
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 const struct i2c_algorithm hdpvr_algo = {
.master_xfer = hdpvr_transfer,
.functionality = hdpvr_functionality,
};
static const struct i2c_adapter hdpvr_i2c_adapter_template = {
.name = "Hauppauge HD PVR I2C",
.owner = THIS_MODULE,
.algo = &hdpvr_algo,
};
static int hdpvr_activate_ir(struct hdpvr_device *dev)
{
char buffer[2];
mutex_lock(&dev->i2c_mutex);
hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);
buffer[0] = 0;
buffer[1] = 0x8;
hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
buffer[1] = 0x18;
hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
mutex_unlock(&dev->i2c_mutex);
return 0;
}
int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
{
hdpvr_activate_ir(dev);
dev->i2c_adapter = hdpvr_i2c_adapter_template;
dev->i2c_adapter.dev.parent = &dev->udev->dev;
i2c_set_adapdata(&dev->i2c_adapter, dev);
return i2c_add_adapter(&dev->i2c_adapter);
}
#endif
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