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path: root/drivers/acpi/ec.c
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Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c97
1 files changed, 53 insertions, 44 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index a51df9681319..354007d490d1 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -158,10 +158,10 @@ static int ec_transaction_done(struct acpi_ec *ec)
{
unsigned long flags;
int ret = 0;
- spin_lock_irqsave(&ec->curr_lock, flags);
+ spin_lock_irqsave(&ec->lock, flags);
if (!ec->curr || ec->curr->done)
ret = 1;
- spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->lock, flags);
return ret;
}
@@ -175,32 +175,38 @@ static void start_transaction(struct acpi_ec *ec)
static void advance_transaction(struct acpi_ec *ec, u8 status)
{
unsigned long flags;
- spin_lock_irqsave(&ec->curr_lock, flags);
- if (!ec->curr)
+ struct transaction *t = ec->curr;
+
+ spin_lock_irqsave(&ec->lock, flags);
+ if (!t)
goto unlock;
- if (ec->curr->wlen > ec->curr->wi) {
+ if (t->wlen > t->wi) {
if ((status & ACPI_EC_FLAG_IBF) == 0)
acpi_ec_write_data(ec,
- ec->curr->wdata[ec->curr->wi++]);
+ t->wdata[t->wi++]);
else
goto err;
- } else if (ec->curr->rlen > ec->curr->ri) {
+ } else if (t->rlen > t->ri) {
if ((status & ACPI_EC_FLAG_OBF) == 1) {
- ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
- if (ec->curr->rlen == ec->curr->ri)
- ec->curr->done = true;
+ t->rdata[t->ri++] = acpi_ec_read_data(ec);
+ if (t->rlen == t->ri)
+ t->done = true;
} else
goto err;
- } else if (ec->curr->wlen == ec->curr->wi &&
+ } else if (t->wlen == t->wi &&
(status & ACPI_EC_FLAG_IBF) == 0)
- ec->curr->done = true;
+ t->done = true;
goto unlock;
err:
- /* false interrupt, state didn't change */
- if (in_interrupt())
- ++ec->curr->irq_count;
+ /*
+ * If SCI bit is set, then don't think it's a false IRQ
+ * otherwise will take a not handled IRQ as a false one.
+ */
+ if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI))
+ ++t->irq_count;
+
unlock:
- spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->lock, flags);
}
static int acpi_ec_sync_query(struct acpi_ec *ec);
@@ -238,9 +244,9 @@ static int ec_poll(struct acpi_ec *ec)
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
break;
pr_debug(PREFIX "controller reset, restart transaction\n");
- spin_lock_irqsave(&ec->curr_lock, flags);
+ spin_lock_irqsave(&ec->lock, flags);
start_transaction(ec);
- spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->lock, flags);
}
return -ETIME;
}
@@ -253,17 +259,17 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
if (EC_FLAGS_MSI)
udelay(ACPI_EC_MSI_UDELAY);
/* start transaction */
- spin_lock_irqsave(&ec->curr_lock, tmp);
+ spin_lock_irqsave(&ec->lock, tmp);
/* following two actions should be kept atomic */
ec->curr = t;
start_transaction(ec);
if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
- spin_unlock_irqrestore(&ec->curr_lock, tmp);
+ spin_unlock_irqrestore(&ec->lock, tmp);
ret = ec_poll(ec);
- spin_lock_irqsave(&ec->curr_lock, tmp);
+ spin_lock_irqsave(&ec->lock, tmp);
ec->curr = NULL;
- spin_unlock_irqrestore(&ec->curr_lock, tmp);
+ spin_unlock_irqrestore(&ec->lock, tmp);
return ret;
}
@@ -292,7 +298,7 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
return -EINVAL;
if (t->rdata)
memset(t->rdata, 0, t->rlen);
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) {
status = -EINVAL;
goto unlock;
@@ -310,7 +316,8 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
status = -ETIME;
goto end;
}
- pr_debug(PREFIX "transaction start\n");
+ pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n",
+ t->command, t->wdata ? t->wdata[0] : 0);
/* disable GPE during transaction if storm is detected */
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
/* It has to be disabled, so that it doesn't trigger. */
@@ -326,8 +333,9 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
/* It is safe to enable the GPE outside of the transaction. */
acpi_enable_gpe(NULL, ec->gpe);
} else if (t->irq_count > ec_storm_threshold) {
- pr_info(PREFIX "GPE storm detected, "
- "transactions will use polling mode\n");
+ pr_info(PREFIX "GPE storm detected(%d GPEs), "
+ "transactions will use polling mode\n",
+ t->irq_count);
set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
}
pr_debug(PREFIX "transaction end\n");
@@ -335,7 +343,7 @@ end:
if (ec->global_lock)
acpi_release_global_lock(glk);
unlock:
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
return status;
}
@@ -403,7 +411,7 @@ int ec_burst_disable(void)
EXPORT_SYMBOL(ec_burst_disable);
-int ec_read(u8 addr, u8 * val)
+int ec_read(u8 addr, u8 *val)
{
int err;
u8 temp_data;
@@ -468,10 +476,10 @@ void acpi_ec_block_transactions(void)
if (!ec)
return;
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
/* Prevent transactions from being carried out */
set_bit(EC_FLAGS_BLOCKED, &ec->flags);
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
}
void acpi_ec_unblock_transactions(void)
@@ -481,10 +489,10 @@ void acpi_ec_unblock_transactions(void)
if (!ec)
return;
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
/* Allow transactions to be carried out again */
clear_bit(EC_FLAGS_BLOCKED, &ec->flags);
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
}
void acpi_ec_unblock_transactions_early(void)
@@ -536,9 +544,9 @@ int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
handler->handle = handle;
handler->func = func;
handler->data = data;
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
list_add(&handler->node, &ec->list);
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
return 0;
}
@@ -547,14 +555,14 @@ EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
{
struct acpi_ec_query_handler *handler, *tmp;
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
list_for_each_entry_safe(handler, tmp, &ec->list, node) {
if (query_bit == handler->query_bit) {
list_del(&handler->node);
kfree(handler);
}
}
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
}
EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
@@ -601,9 +609,9 @@ static void acpi_ec_gpe_query(void *ec_cxt)
struct acpi_ec *ec = ec_cxt;
if (!ec)
return;
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
acpi_ec_sync_query(ec);
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
}
static int ec_check_sci(struct acpi_ec *ec, u8 state)
@@ -622,10 +630,11 @@ static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
u32 gpe_number, void *data)
{
struct acpi_ec *ec = data;
+ u8 status = acpi_ec_read_status(ec);
- pr_debug(PREFIX "~~~> interrupt\n");
+ pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status);
- advance_transaction(ec, acpi_ec_read_status(ec));
+ advance_transaction(ec, status);
if (ec_transaction_done(ec) &&
(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) {
wake_up(&ec->wait);
@@ -691,10 +700,10 @@ static struct acpi_ec *make_acpi_ec(void)
if (!ec)
return NULL;
ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
- mutex_init(&ec->lock);
+ mutex_init(&ec->mutex);
init_waitqueue_head(&ec->wait);
INIT_LIST_HEAD(&ec->list);
- spin_lock_init(&ec->curr_lock);
+ spin_lock_init(&ec->lock);
return ec;
}
@@ -853,12 +862,12 @@ static int acpi_ec_remove(struct acpi_device *device, int type)
ec = acpi_driver_data(device);
ec_remove_handlers(ec);
- mutex_lock(&ec->lock);
+ mutex_lock(&ec->mutex);
list_for_each_entry_safe(handler, tmp, &ec->list, node) {
list_del(&handler->node);
kfree(handler);
}
- mutex_unlock(&ec->lock);
+ mutex_unlock(&ec->mutex);
release_region(ec->data_addr, 1);
release_region(ec->command_addr, 1);
device->driver_data = NULL;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.