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-rw-r--r--drivers/acpi/ec.c151
-rw-r--r--drivers/acpi/internal.h3
2 files changed, 119 insertions, 35 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 97e08d0e3192..4fd84fbdac29 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -398,7 +398,7 @@ static void acpi_ec_submit_request(struct acpi_ec *ec)
{
ec->reference_count++;
if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) &&
- ec->reference_count == 1)
+ ec->gpe >= 0 && ec->reference_count == 1)
acpi_ec_enable_gpe(ec, true);
}
@@ -408,7 +408,7 @@ static void acpi_ec_complete_request(struct acpi_ec *ec)
ec->reference_count--;
if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) &&
- ec->reference_count == 0)
+ ec->gpe >= 0 && ec->reference_count == 0)
acpi_ec_disable_gpe(ec, true);
flushed = acpi_ec_flushed(ec);
if (flushed)
@@ -418,7 +418,11 @@ static void acpi_ec_complete_request(struct acpi_ec *ec)
static void acpi_ec_mask_events(struct acpi_ec *ec)
{
if (!test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) {
- acpi_ec_disable_gpe(ec, false);
+ if (ec->gpe >= 0)
+ acpi_ec_disable_gpe(ec, false);
+ else
+ disable_irq_nosync(ec->irq);
+
ec_dbg_drv("Polling enabled");
set_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags);
}
@@ -428,7 +432,11 @@ static void acpi_ec_unmask_events(struct acpi_ec *ec)
{
if (test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) {
clear_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags);
- acpi_ec_enable_gpe(ec, false);
+ if (ec->gpe >= 0)
+ acpi_ec_enable_gpe(ec, false);
+ else
+ enable_irq(ec->irq);
+
ec_dbg_drv("Polling disabled");
}
}
@@ -648,7 +656,9 @@ static void advance_transaction(struct acpi_ec *ec)
* ensure a hardware STS 0->1 change after this clearing can always
* trigger a GPE interrupt.
*/
- acpi_ec_clear_gpe(ec);
+ if (ec->gpe >= 0)
+ acpi_ec_clear_gpe(ec);
+
status = acpi_ec_read_status(ec);
t = ec->curr;
/*
@@ -1275,18 +1285,28 @@ static void acpi_ec_event_handler(struct work_struct *work)
acpi_ec_check_event(ec);
}
-static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
- u32 gpe_number, void *data)
+static void acpi_ec_handle_interrupt(struct acpi_ec *ec)
{
unsigned long flags;
- struct acpi_ec *ec = data;
spin_lock_irqsave(&ec->lock, flags);
advance_transaction(ec);
spin_unlock_irqrestore(&ec->lock, flags);
+}
+
+static u32 acpi_ec_gpe_handler(acpi_handle gpe_device,
+ u32 gpe_number, void *data)
+{
+ acpi_ec_handle_interrupt(data);
return ACPI_INTERRUPT_HANDLED;
}
+static irqreturn_t acpi_ec_irq_handler(int irq, void *data)
+{
+ acpi_ec_handle_interrupt(data);
+ return IRQ_HANDLED;
+}
+
/* --------------------------------------------------------------------------
* Address Space Management
* -------------------------------------------------------------------------- */
@@ -1359,6 +1379,8 @@ static struct acpi_ec *acpi_ec_alloc(void)
ec->timestamp = jiffies;
ec->busy_polling = true;
ec->polling_guard = 0;
+ ec->gpe = -1;
+ ec->irq = -1;
return ec;
}
@@ -1406,9 +1428,13 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
/* Get GPE bit assignment (EC events). */
/* TODO: Add support for _GPE returning a package */
status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
- if (ACPI_FAILURE(status))
- return status;
- ec->gpe = tmp;
+ if (ACPI_SUCCESS(status))
+ ec->gpe = tmp;
+
+ /*
+ * Errors are non-fatal, allowing for ACPI Reduced Hardware
+ * platforms which use GpioInt instead of GPE.
+ */
}
/* Use the global lock for all EC transactions? */
tmp = 0;
@@ -1418,12 +1444,57 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
return AE_CTRL_TERMINATE;
}
+static void install_gpe_event_handler(struct acpi_ec *ec)
+{
+ acpi_status status =
+ acpi_install_gpe_raw_handler(NULL, ec->gpe,
+ ACPI_GPE_EDGE_TRIGGERED,
+ &acpi_ec_gpe_handler,
+ ec);
+ if (ACPI_SUCCESS(status)) {
+ /* This is not fatal as we can poll EC events */
+ set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
+ acpi_ec_leave_noirq(ec);
+ if (test_bit(EC_FLAGS_STARTED, &ec->flags) &&
+ ec->reference_count >= 1)
+ acpi_ec_enable_gpe(ec, true);
+ }
+}
+
+/* ACPI reduced hardware platforms use a GpioInt specified in _CRS. */
+static int install_gpio_irq_event_handler(struct acpi_ec *ec,
+ struct acpi_device *device)
+{
+ int irq = acpi_dev_gpio_irq_get(device, 0);
+ int ret;
+
+ if (irq < 0)
+ return irq;
+
+ ret = request_irq(irq, acpi_ec_irq_handler, IRQF_SHARED,
+ "ACPI EC", ec);
+
+ /*
+ * Unlike the GPE case, we treat errors here as fatal, we'll only
+ * implement GPIO polling if we find a case that needs it.
+ */
+ if (ret < 0)
+ return ret;
+
+ ec->irq = irq;
+ set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
+ acpi_ec_leave_noirq(ec);
+
+ return 0;
+}
+
/*
* Note: This function returns an error code only when the address space
* handler is not installed, which means "not able to handle
* transactions".
*/
-static int ec_install_handlers(struct acpi_ec *ec, bool handle_events)
+static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device,
+ bool handle_events)
{
acpi_status status;
@@ -1464,16 +1535,15 @@ static int ec_install_handlers(struct acpi_ec *ec, bool handle_events)
set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags);
}
if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
- status = acpi_install_gpe_raw_handler(NULL, ec->gpe,
- ACPI_GPE_EDGE_TRIGGERED,
- &acpi_ec_gpe_handler, ec);
- /* This is not fatal as we can poll EC events */
- if (ACPI_SUCCESS(status)) {
- set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
- acpi_ec_leave_noirq(ec);
- if (test_bit(EC_FLAGS_STARTED, &ec->flags) &&
- ec->reference_count >= 1)
- acpi_ec_enable_gpe(ec, true);
+ if (ec->gpe >= 0) {
+ install_gpe_event_handler(ec);
+ } else if (device) {
+ int ret = install_gpio_irq_event_handler(ec, device);
+
+ if (ret)
+ return ret;
+ } else { /* No GPE and no GpioInt? */
+ return -ENODEV;
}
}
/* EC is fully operational, allow queries */
@@ -1505,9 +1575,14 @@ static void ec_remove_handlers(struct acpi_ec *ec)
acpi_ec_stop(ec, false);
if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
- if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
- &acpi_ec_gpe_handler)))
+ if (ec->gpe >= 0 &&
+ ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
+ &acpi_ec_gpe_handler)))
pr_err("failed to remove gpe handler\n");
+
+ if (ec->irq >= 0)
+ free_irq(ec->irq, ec);
+
clear_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
}
if (test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) {
@@ -1516,11 +1591,12 @@ static void ec_remove_handlers(struct acpi_ec *ec)
}
}
-static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events)
+static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device,
+ bool handle_events)
{
int ret;
- ret = ec_install_handlers(ec, handle_events);
+ ret = ec_install_handlers(ec, device, handle_events);
if (ret)
return ret;
@@ -1531,8 +1607,8 @@ static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events)
}
acpi_handle_info(ec->handle,
- "GPE=0x%x, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n",
- ec->gpe, ec->command_addr, ec->data_addr);
+ "GPE=0x%x, IRQ=%d, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n",
+ ec->gpe, ec->irq, ec->command_addr, ec->data_addr);
return ret;
}
@@ -1596,7 +1672,7 @@ static int acpi_ec_add(struct acpi_device *device)
}
}
- ret = acpi_ec_setup(ec, true);
+ ret = acpi_ec_setup(ec, device, true);
if (ret)
goto err_query;
@@ -1716,7 +1792,7 @@ void __init acpi_ec_dsdt_probe(void)
* At this point, the GPE is not fully initialized, so do not to
* handle the events.
*/
- ret = acpi_ec_setup(ec, false);
+ ret = acpi_ec_setup(ec, NULL, false);
if (ret) {
acpi_ec_free(ec);
return;
@@ -1889,14 +1965,21 @@ void __init acpi_ec_ecdt_probe(void)
ec->command_addr = ecdt_ptr->control.address;
ec->data_addr = ecdt_ptr->data.address;
}
- ec->gpe = ecdt_ptr->gpe;
+
+ /*
+ * Ignore the GPE value on Reduced Hardware platforms.
+ * Some products have this set to an erroneous value.
+ */
+ if (!acpi_gbl_reduced_hardware)
+ ec->gpe = ecdt_ptr->gpe;
+
ec->handle = ACPI_ROOT_OBJECT;
/*
* At this point, the namespace is not initialized, so do not find
* the namespace objects, or handle the events.
*/
- ret = acpi_ec_setup(ec, false);
+ ret = acpi_ec_setup(ec, NULL, false);
if (ret) {
acpi_ec_free(ec);
return;
@@ -1928,7 +2011,7 @@ static int acpi_ec_suspend_noirq(struct device *dev)
* masked at the low level without side effects.
*/
if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
- ec->reference_count >= 1)
+ ec->gpe >= 0 && ec->reference_count >= 1)
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
acpi_ec_enter_noirq(ec);
@@ -1943,7 +2026,7 @@ static int acpi_ec_resume_noirq(struct device *dev)
acpi_ec_leave_noirq(ec);
if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
- ec->reference_count >= 1)
+ ec->gpe >= 0 && ec->reference_count >= 1)
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
return 0;
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index afe6636f9ad3..3616daec650b 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -165,7 +165,8 @@ static inline void acpi_early_processor_osc(void) {}
-------------------------------------------------------------------------- */
struct acpi_ec {
acpi_handle handle;
- u32 gpe;
+ int gpe;
+ int irq;
unsigned long command_addr;
unsigned long data_addr;
bool global_lock;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.