@@ -62,15 +62,25 @@ struct i2c_client *hdpvr_register_ir_rx_i2c(struct hdpvr_device *dev)
}
static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
- unsigned char addr, char *data, int len)
+ unsigned char addr, char *wdata, int wlen,
+ char *data, int len)
{
int ret;
- if (len > sizeof(dev->i2c_buf))
+ if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
return -EINVAL;
- ret = usb_control_msg(dev->udev,
- usb_rcvctrlpipe(dev->udev, 0),
+ 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);
@@ -92,16 +102,14 @@ static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
return -EINVAL;
memcpy(&dev->i2c_buf, data, len);
- ret = usb_control_msg(dev->udev,
- usb_sndctrlpipe(dev->udev, 0),
+ 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),
+ 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);
@@ -117,24 +125,49 @@ 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;
+ int retval = 0, addr;
if (num <= 0)
return 0;
mutex_lock(&dev->i2c_mutex);
- for (i = 0; i < num && !retval; i++) {
- addr = msgs[i].addr << 1;
+ addr = msgs[0].addr << 1;
- if (msgs[i].flags & I2C_M_RD)
- retval = hdpvr_i2c_read(dev, 1, addr, msgs[i].buf,
- msgs[i].len);
+ 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[i].buf,
- msgs[i].len);
+ 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;
@@ -162,7 +195,7 @@ static int hdpvr_activate_ir(struct hdpvr_device *dev)
mutex_lock(&dev->i2c_mutex);
- hdpvr_i2c_read(dev, 0, 0x54, buffer, 1);
+ hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);
buffer[0] = 0;
buffer[1] = 0x8;