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(Phil) Quick transactions seem to work now.

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git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1231 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Philip Edelbrock committed 2001-11-11 03:36:25 +00:00
1 parent b2ab0e99b0
commit f29c9bcf78
1 file changed
+32 -1
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kernel/busses/i2c-keywest.c
+32 -1
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@@ -127,6 +127,27 @@ int poll_interrupt(void *ISR)
return -1; /* Should never get here */
}
int poll_ack(void *status)
{
int i, res;
for (i = 0; i < 100; i++) {
udelay(10);
res = readb(status) & 0x02;
if (res > 0) {
printk("i2c-keywest: got ack: 0x%02X in 0x%02X iter\n",res,i);
return res;
}
}
if (i == POLL_SANITY) {
printk("i2c-keywest: Sanity check failed! Expected ack never happened.\n");
return 0;
}
return 0; /* Should never get here */
}
void keywest_reset(struct keywest_iface *ifaceptr)
{
@@ -163,6 +184,7 @@ s32 keywest_access(struct i2c_adapter *adap, u16 addr,
/* Start sending address */
writeb_wait(readb(ifaceptr->control) | 2, ifaceptr->control);
interrupt_state = poll_interrupt(ifaceptr->ISR);
ack = readb(ifaceptr->status) & 0x0F;
if ((ack & 0x02) == 0) {
@@ -176,6 +198,15 @@ s32 keywest_access(struct i2c_adapter *adap, u16 addr,
writeb_wait(1 | readb(ifaceptr->control), ifaceptr->control);
switch (size) {
case I2C_SMBUS_QUICK:
/* Send stop */
writeb_wait(readb(ifaceptr->control) | 4, ifaceptr->control);
writeb_wait(interrupt_state, ifaceptr->control);
interrupt_state = poll_interrupt(ifaceptr->ISR);
if (interrupt_state < 0)
error_state = -1;
writeb_wait(interrupt_state, ifaceptr->ISR);
break; /* we're done! */
case I2C_SMBUS_BYTE_DATA:
if (read_write == I2C_SMBUS_WRITE) {
writeb_wait(data->byte, ifaceptr->data);
@@ -581,6 +612,6 @@ i2c_keywest_cleanup(void)
module_init(i2c_keywest_init);
module_exit(i2c_keywest_cleanup);
MODULE_AUTHOR("Philip Edelbrock <phil@netroedge.com");
MODULE_AUTHOR("Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("I2C driver for Apple's Keywest");
EXPORT_NO_SYMBOLS;