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ACPI: EC: enable burst functionality in EC.

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Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alexey Starikovskiy 2007-03-07 22:28:00 +03:00 committed by Len Brown
parent 33c7a0738c
commit c45aac43fe
1 changed files with 37 additions and 52 deletions
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89
drivers/acpi/ec.c
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@ -101,7 +101,6 @@ static struct acpi_ec {
struct mutex lock;
atomic_t query_pending;
atomic_t event_count;
atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
wait_queue_head_t wait;
} *ec_ecdt;
@ -173,56 +172,6 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
return -ETIME;
}
#ifdef ACPI_FUTURE_USAGE
/*
* Note: samsung nv5000 doesn't work with ec burst mode.
* http://bugzilla.kernel.org/show_bug.cgi?id=4980
*/
int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
{
u8 tmp = 0;
u8 status = 0;
status = acpi_ec_read_status(ec);
if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
if (status)
goto end;
acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
tmp = acpi_ec_read_data(ec);
if (tmp != 0x90) { /* Burst ACK byte */
return -EINVAL;
}
}
atomic_set(&ec->leaving_burst, 0);
return 0;
end:
ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
return -1;
}
int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
{
u8 status = 0;
status = acpi_ec_read_status(ec);
if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
if (status)
goto end;
acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
}
atomic_set(&ec->leaving_burst, 1);
return 0;
end:
ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
return -1;
}
#endif /* ACPI_FUTURE_USAGE */
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
const u8 * wdata, unsigned wdata_len,
u8 * rdata, unsigned rdata_len)
@ -312,6 +261,21 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
return status;
}
/*
* Note: samsung nv5000 doesn't work with ec burst mode.
* http://bugzilla.kernel.org/show_bug.cgi?id=4980
*/
int acpi_ec_burst_enable(struct acpi_ec *ec)
{
u8 d;
return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
}
int acpi_ec_burst_disable(struct acpi_ec *ec)
{
return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
}
static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
{
int result;
@ -333,6 +297,28 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
/*
* Externally callable EC access functions. For now, assume 1 EC only
*/
int ec_burst_enable(void)
{
struct acpi_ec *ec;
if (!first_ec)
return -ENODEV;
ec = acpi_driver_data(first_ec);
return acpi_ec_burst_enable(ec);
}
EXPORT_SYMBOL(ec_burst_enable);
int ec_burst_disable(void)
{
struct acpi_ec *ec;
if (!first_ec)
return -ENODEV;
ec = acpi_driver_data(first_ec);
return acpi_ec_burst_disable(ec);
}
EXPORT_SYMBOL(ec_burst_disable);
int ec_read(u8 addr, u8 * val)
{
struct acpi_ec *ec;
@ -639,7 +625,6 @@ static int acpi_ec_add(struct acpi_device *device)
atomic_set(&ec->query_pending, 0);
atomic_set(&ec->event_count, 1);
if (acpi_ec_mode == EC_INTR) {
atomic_set(&ec->leaving_burst, 1);
init_waitqueue_head(&ec->wait);
}
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);