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ACPI: EC: add support for hardware-reduced systems
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As defined in the ACPI spec section 12.11, ACPI hardware-reduced
platforms define the EC SCI interrupt as a GpioInt in the _CRS object.

This replaces the previous way of using a GPE for this interrupt;
GPE blocks are not available on reduced hardware platforms.

Add support for handling this interrupt as an EC event source, and
avoid GPE usage on reduced hardware platforms.

This enables the use of several media keys (e.g. screen brightness
up/down) on Asus UX434DA.

Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Daniel Drake authored and Rafael J. Wysocki committed Oct 28, 2019
1 parent 4446abc commit 406857f
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Showing 2 changed files with 119 additions and 35 deletions.
151 changes: 117 additions & 34 deletions drivers/acpi/ec.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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);
}

Expand All @@ -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)
Expand All @@ -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);
}
Expand All @@ -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");
}
}
Expand Down Expand Up @@ -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;
/*
Expand Down Expand Up @@ -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
* -------------------------------------------------------------------------- */
Expand Down Expand Up @@ -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;
}

Expand Down Expand Up @@ -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;
Expand All @@ -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;

Expand Down Expand Up @@ -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 */
Expand Down Expand Up @@ -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)) {
Expand All @@ -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;

Expand All @@ -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;
}

Expand Down Expand Up @@ -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;

Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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);
Expand All @@ -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;
Expand Down
3 changes: 2 additions & 1 deletion drivers/acpi/internal.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down

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