/*
* iicbus_write_byte()
*
* Write a byte to the slave previously started by iicbus_start() call
*/
int
iicbus_write_byte(device_t bus, char byte, int timeout)
{
char data = byte;
int sent;
return (iicbus_write(bus, &data, 1, &sent, timeout));
}
static int
iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
{
device_t iicdev = IIC_DEVICE(minor(dev));
struct iic_softc *sc = IIC_SOFTC(minor(dev));
device_t parent = device_get_parent(iicdev);
struct iiccmd *s = (struct iiccmd *)data;
int error, count;
if (!sc)
return (EINVAL);
if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
(flags & O_NONBLOCK) ? IIC_DONTWAIT :
(IIC_WAIT | IIC_INTR))))
return (error);
switch (cmd) {
case I2CSTART:
error = iicbus_start(parent, s->slave, 0);
/*
* Implicitly set the chip addr to the slave addr passed as
* parameter. Consequently, start/stop shall be called before
* the read or the write of a block.
*/
if (!error)
sc->sc_addr = s->slave;
break;
case I2CSTOP:
error = iicbus_stop(parent);
break;
case I2CRSTCARD:
error = iicbus_reset(parent, 0, 0, NULL);
break;
case I2CWRITE:
error = iicbus_write(parent, s->buf, s->count, &count, 10);
break;
case I2CREAD:
error = iicbus_read(parent, s->buf, s->count, &count, s->last, 10);
break;
default:
error = ENODEV;
}
iicbus_release_bus(device_get_parent(iicdev), iicdev);
return (error);
}
/*
* Generic version of iicbus_transfer that calls the appropriate
* routines to accomplish this. See note above about acceptable
* buffer addresses.
*/
int
iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
{
int i, error, lenread, lenwrote, nkid, rpstart, addr;
device_t *children, bus;
bool nostop;
if ((error = device_get_children(dev, &children, &nkid)) != 0)
return (IIC_ERESOURCE);
if (nkid != 1) {
free(children, M_TEMP);
return (IIC_ENOTSUPP);
}
bus = children[0];
rpstart = 0;
free(children, M_TEMP);
nostop = iicbus_get_nostop(dev);
for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
addr = msgs[i].slave;
if (msgs[i].flags & IIC_M_RD)
addr |= LSB;
else
addr &= ~LSB;
if (!(msgs[i].flags & IIC_M_NOSTART)) {
if (rpstart)
error = iicbus_repeated_start(bus, addr, 0);
else
error = iicbus_start(bus, addr, 0);
}
if (error != 0)
break;
if (msgs[i].flags & IIC_M_RD)
error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
&lenread, IIC_LAST_READ, 0);
else
error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
&lenwrote, 0);
if (error != 0)
break;
if ((msgs[i].flags & IIC_M_NOSTOP) != 0 ||
(nostop && i + 1 < nmsgs)) {
rpstart = 1; /* Next message gets repeated start */
} else {
rpstart = 0;
iicbus_stop(bus);
}
}
if (error != 0 && !nostop)
iicbus_stop(bus);
return (error);
}
/*
* iicbus_write_byte()
*
* Write a byte to the slave previously started by iicbus_start() call
*/
int
iicbus_write_byte(device_t bus, char byte, int timeout)
{
struct iicbus_softc *sc = device_get_softc(bus);
char data = byte;
int sent;
/* a slave must have been started for writing */
if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))
return (IIC_ESTATUS);
return (iicbus_write(bus, &data, 1, &sent, timeout));
}
/*
* iicbus_block_write()
*
* Write a block of data to slave ; start/stop protocol managed
*/
int
iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
{
u_char addr = slave & ~LSB;
int error;
if ((error = iicbus_start(bus, addr, 0)))
return (error);
error = iicbus_write(bus, buf, len, sent, 0);
iicbus_stop(bus);
return (error);
}
static int
iicuio_move(struct iic_cdevpriv *priv, struct uio *uio, int last)
{
device_t parent;
int error, num_bytes, transferred_bytes, written_bytes;
char buffer[128];
parent = device_get_parent(priv->sc->sc_dev);
error = 0;
/*
* We can only transfer up to sizeof(buffer) bytes in 1 shot, so loop until
* everything has been transferred.
*/
while ((error == 0) && (uio->uio_resid > 0)) {
num_bytes = MIN(uio->uio_resid, sizeof(buffer));
transferred_bytes = 0;
if (uio->uio_rw == UIO_WRITE) {
error = uiomove(buffer, num_bytes, uio);
while ((error == 0) && (transferred_bytes < num_bytes)) {
written_bytes = 0;
error = iicbus_write(parent, &buffer[transferred_bytes],
num_bytes - transferred_bytes, &written_bytes, 0);
transferred_bytes += written_bytes;
}
} else if (uio->uio_rw == UIO_READ) {
error = iicbus_read(parent, buffer,
num_bytes, &transferred_bytes,
((uio->uio_resid <= sizeof(buffer)) ? last : 0), 0);
if (error == 0)
error = uiomove(buffer, transferred_bytes, uio);
}
}
return (error);
}
