diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d1f1cf5d4bf084e526ecb0f953f0097defd474d1..9c7410588a2787cc9b310b2338c86f0592577fe2 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -182,7 +182,6 @@ static bool boot_ec_is_ecdt = false;
static struct workqueue_struct *ec_wq;
static struct workqueue_struct *ec_query_wq;
-static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */
static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */
static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
@@ -690,21 +689,9 @@ static void advance_transaction(struct acpi_ec *ec)
wakeup = true;
}
goto out;
- } else {
- if (EC_FLAGS_QUERY_HANDSHAKE &&
- !(status & ACPI_EC_FLAG_SCI) &&
- (t->command == ACPI_EC_COMMAND_QUERY)) {
- ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL);
- t->rdata[t->ri++] = 0x00;
- ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE);
- ec_dbg_evt("Command(%s) completed by software",
- acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
- wakeup = true;
- } else if ((status & ACPI_EC_FLAG_IBF) == 0) {
- acpi_ec_write_cmd(ec, t->command);
- ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL);
- } else
- goto err;
+ } else if (!(status & ACPI_EC_FLAG_IBF)) {
+ acpi_ec_write_cmd(ec, t->command);
+ ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL);
goto out;
}
err:
@@ -1427,57 +1414,45 @@ 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)
+static bool install_gpe_event_handler(struct acpi_ec *ec)
{
- int irq = acpi_dev_gpio_irq_get(device, 0);
- int ret;
-
- if (irq < 0)
- return irq;
+ acpi_status status;
- ret = request_irq(irq, acpi_ec_irq_handler, IRQF_SHARED,
- "ACPI EC", ec);
+ status = acpi_install_gpe_raw_handler(NULL, ec->gpe,
+ ACPI_GPE_EDGE_TRIGGERED,
+ &acpi_ec_gpe_handler, ec);
+ if (ACPI_FAILURE(status))
+ return false;
- /*
- * 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;
+ if (test_bit(EC_FLAGS_STARTED, &ec->flags) && ec->reference_count >= 1)
+ acpi_ec_enable_gpe(ec, true);
- ec->irq = irq;
- set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
- acpi_ec_leave_noirq(ec);
+ return true;
+}
- return 0;
+static bool install_gpio_irq_event_handler(struct acpi_ec *ec)
+{
+ return request_irq(ec->irq, acpi_ec_irq_handler, IRQF_SHARED,
+ "ACPI EC", ec) >= 0;
}
-/*
- * Note: This function returns an error code only when the address space
- * handler is not installed, which means "not able to handle
- * transactions".
+/**
+ * ec_install_handlers - Install service callbacks and register query methods.
+ * @ec: Target EC.
+ * @device: ACPI device object corresponding to @ec.
+ *
+ * Install a handler for the EC address space type unless it has been installed
+ * already. If @device is not NULL, also look for EC query methods in the
+ * namespace and register them, and install an event (either GPE or GPIO IRQ)
+ * handler for the EC, if possible.
+ *
+ * Return:
+ * -ENODEV if the address space handler cannot be installed, which means
+ * "unable to handle transactions",
+ * -EPROBE_DEFER if GPIO IRQ acquisition needs to be deferred,
+ * or 0 (success) otherwise.
*/
-static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device,
- bool handle_events)
+static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device)
{
acpi_status status;
@@ -1490,26 +1465,28 @@ static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device,
&acpi_ec_space_handler,
NULL, ec);
if (ACPI_FAILURE(status)) {
- if (status == AE_NOT_FOUND) {
- /*
- * Maybe OS fails in evaluating the _REG
- * object. The AE_NOT_FOUND error will be
- * ignored and OS * continue to initialize
- * EC.
- */
- pr_err("Fail in evaluating the _REG object"
- " of EC device. Broken bios is suspected.\n");
- } else {
- acpi_ec_stop(ec, false);
- return -ENODEV;
- }
+ acpi_ec_stop(ec, false);
+ return -ENODEV;
}
set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags);
}
- if (!handle_events)
+ if (!device)
return 0;
+ if (ec->gpe < 0) {
+ /* ACPI reduced hardware platforms use a GpioInt from _CRS. */
+ int irq = acpi_dev_gpio_irq_get(device, 0);
+ /*
+ * Bail out right away for deferred probing or complete the
+ * initialization regardless of any other errors.
+ */
+ if (irq == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ else if (irq >= 0)
+ ec->irq = irq;
+ }
+
if (!test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) {
/* Find and register all query methods */
acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
@@ -1518,16 +1495,21 @@ static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device,
set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags);
}
if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
- 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;
+ bool ready = false;
+
+ if (ec->gpe >= 0)
+ ready = install_gpe_event_handler(ec);
+ else if (ec->irq >= 0)
+ ready = install_gpio_irq_event_handler(ec);
+
+ if (ready) {
+ set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags);
+ acpi_ec_leave_noirq(ec);
}
+ /*
+ * Failures to install an event handler are not fatal, because
+ * the EC can be polled for events.
+ */
}
/* EC is fully operational, allow queries */
acpi_ec_enable_event(ec);
@@ -1574,61 +1556,46 @@ static void ec_remove_handlers(struct acpi_ec *ec)
}
}
-static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device,
- bool handle_events)
+static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device)
{
int ret;
- ret = ec_install_handlers(ec, device, handle_events);
+ ret = ec_install_handlers(ec, device);
if (ret)
return ret;
/* First EC capable of handling transactions */
- if (!first_ec) {
+ if (!first_ec)
first_ec = ec;
- acpi_handle_info(first_ec->handle, "Used as first EC\n");
- }
-
- acpi_handle_info(ec->handle,
- "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;
-}
-static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle)
-{
- struct acpi_table_ecdt *ecdt_ptr;
- acpi_status status;
- acpi_handle handle;
+ pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec->command_addr,
+ ec->data_addr);
- status = acpi_get_table(ACPI_SIG_ECDT, 1,
- (struct acpi_table_header **)&ecdt_ptr);
- if (ACPI_FAILURE(status))
- return false;
-
- status = acpi_get_handle(NULL, ecdt_ptr->id, &handle);
- if (ACPI_FAILURE(status))
- return false;
+ if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
+ if (ec->gpe >= 0)
+ pr_info("GPE=0x%x\n", ec->gpe);
+ else
+ pr_info("IRQ=%d\n", ec->irq);
+ }
- *phandle = handle;
- return true;
+ return ret;
}
static int acpi_ec_add(struct acpi_device *device)
{
- struct acpi_ec *ec = NULL;
- bool dep_update = true;
- acpi_status status;
+ struct acpi_ec *ec;
int ret;
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
- if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
- boot_ec_is_ecdt = true;
+ if ((boot_ec && boot_ec->handle == device->handle) ||
+ !strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
+ /* Fast path: this device corresponds to the boot EC. */
ec = boot_ec;
- dep_update = false;
} else {
+ acpi_status status;
+
ec = acpi_ec_alloc();
if (!ec)
return -ENOMEM;
@@ -1636,12 +1603,11 @@ static int acpi_ec_add(struct acpi_device *device)
status = ec_parse_device(device->handle, 0, ec, NULL);
if (status != AE_CTRL_TERMINATE) {
ret = -EINVAL;
- goto err_alloc;
+ goto err;
}
if (boot_ec && ec->command_addr == boot_ec->command_addr &&
ec->data_addr == boot_ec->data_addr) {
- boot_ec_is_ecdt = false;
/*
* Trust PNP0C09 namespace location rather than
* ECDT ID. But trust ECDT GPE rather than _GPE
@@ -1655,15 +1621,18 @@ static int acpi_ec_add(struct acpi_device *device)
}
}
- ret = acpi_ec_setup(ec, device, true);
+ ret = acpi_ec_setup(ec, device);
if (ret)
- goto err_query;
+ goto err;
if (ec == boot_ec)
acpi_handle_info(boot_ec->handle,
- "Boot %s EC used to handle transactions and events\n",
+ "Boot %s EC initialization complete\n",
boot_ec_is_ecdt ? "ECDT" : "DSDT");
+ acpi_handle_info(ec->handle,
+ "EC: Used to handle transactions and events\n");
+
device->driver_data = ec;
ret = !!request_region(ec->data_addr, 1, "EC data");
@@ -1671,19 +1640,16 @@ static int acpi_ec_add(struct acpi_device *device)
ret = !!request_region(ec->command_addr, 1, "EC cmd");
WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
- if (dep_update) {
- /* Reprobe devices depending on the EC */
- acpi_walk_dep_device_list(ec->handle);
- }
+ /* Reprobe devices depending on the EC */
+ acpi_walk_dep_device_list(ec->handle);
+
acpi_handle_debug(ec->handle, "enumerated.\n");
return 0;
-err_query:
- if (ec != boot_ec)
- acpi_ec_remove_query_handlers(ec, true, 0);
-err_alloc:
+err:
if (ec != boot_ec)
acpi_ec_free(ec);
+
return ret;
}
@@ -1775,7 +1741,7 @@ 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, NULL, false);
+ ret = acpi_ec_setup(ec, NULL);
if (ret) {
acpi_ec_free(ec);
return;
@@ -1788,52 +1754,43 @@ void __init acpi_ec_dsdt_probe(void)
}
/*
- * If the DSDT EC is not functioning, we still need to prepare a fully
- * functioning ECDT EC first in order to handle the events.
- * https://bugzilla.kernel.org/show_bug.cgi?id=115021
+ * acpi_ec_ecdt_start - Finalize the boot ECDT EC initialization.
+ *
+ * First, look for an ACPI handle for the boot ECDT EC if acpi_ec_add() has not
+ * found a matching object in the namespace.
+ *
+ * Next, in case the DSDT EC is not functioning, it is still necessary to
+ * provide a functional ECDT EC to handle events, so add an extra device object
+ * to represent it (see https://bugzilla.kernel.org/show_bug.cgi?id=115021).
+ *
+ * This is useful on platforms with valid ECDT and invalid DSDT EC settings,
+ * like ASUS X550ZE (see https://bugzilla.kernel.org/show_bug.cgi?id=196847).
*/
-static int __init acpi_ec_ecdt_start(void)
+static void __init acpi_ec_ecdt_start(void)
{
+ struct acpi_table_ecdt *ecdt_ptr;
acpi_handle handle;
+ acpi_status status;
- if (!boot_ec)
- return -ENODEV;
- /* In case acpi_ec_ecdt_start() is called after acpi_ec_add() */
- if (!boot_ec_is_ecdt)
- return -ENODEV;
+ /* Bail out if a matching EC has been found in the namespace. */
+ if (!boot_ec || boot_ec->handle != ACPI_ROOT_OBJECT)
+ return;
- /*
- * At this point, the namespace and the GPE is initialized, so
- * start to find the namespace objects and handle the events.
- *
- * Note: ec->handle can be valid if this function is called after
- * acpi_ec_add(), hence the fast path.
- */
- if (boot_ec->handle == ACPI_ROOT_OBJECT) {
- if (!acpi_ec_ecdt_get_handle(&handle))
- return -ENODEV;
- boot_ec->handle = handle;
- }
+ /* Look up the object pointed to from the ECDT in the namespace. */
+ status = acpi_get_table(ACPI_SIG_ECDT, 1,
+ (struct acpi_table_header **)&ecdt_ptr);
+ if (ACPI_FAILURE(status))
+ return;
- /* Register to ACPI bus with PM ops attached */
- return acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC);
-}
+ status = acpi_get_handle(NULL, ecdt_ptr->id, &handle);
+ if (ACPI_FAILURE(status))
+ return;
-#if 0
-/*
- * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not
- * set, for which case, we complete the QR_EC without issuing it to the
- * firmware.
- * https://bugzilla.kernel.org/show_bug.cgi?id=82611
- * https://bugzilla.kernel.org/show_bug.cgi?id=97381
- */
-static int ec_flag_query_handshake(const struct dmi_system_id *id)
-{
- pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n");
- EC_FLAGS_QUERY_HANDSHAKE = 1;
- return 0;
+ boot_ec->handle = handle;
+
+ /* Add a special ACPI device object to represent the boot EC. */
+ acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC);
}
-#endif
/*
* On some hardware it is necessary to clear events accumulated by the EC during
@@ -1962,7 +1919,7 @@ void __init acpi_ec_ecdt_probe(void)
* At this point, the namespace is not initialized, so do not find
* the namespace objects, or handle the events.
*/
- ret = acpi_ec_setup(ec, NULL, false);
+ ret = acpi_ec_setup(ec, NULL);
if (ret) {
acpi_ec_free(ec);
return;
@@ -2160,14 +2117,13 @@ static const struct dmi_system_id acpi_ec_no_wakeup[] = {
{ },
};
-int __init acpi_ec_init(void)
+void __init acpi_ec_init(void)
{
int result;
- int ecdt_fail, dsdt_fail;
result = acpi_ec_init_workqueues();
if (result)
- return result;
+ return;
/*
* Disable EC wakeup on following systems to prevent periodic
@@ -2178,16 +2134,10 @@ int __init acpi_ec_init(void)
pr_debug("Disabling EC wakeup on suspend-to-idle\n");
}
- /* Drivers must be started after acpi_ec_query_init() */
- dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver);
- /*
- * Register ECDT to ACPI bus only when PNP0C09 probe fails. This is
- * useful for platforms (confirmed on ASUS X550ZE) with valid ECDT
- * settings but invalid DSDT settings.
- * https://bugzilla.kernel.org/show_bug.cgi?id=196847
- */
- ecdt_fail = acpi_ec_ecdt_start();
- return ecdt_fail && dsdt_fail ? -ENODEV : 0;
+ /* Driver must be registered after acpi_ec_init_workqueues(). */
+ acpi_bus_register_driver(&acpi_ec_driver);
+
+ acpi_ec_ecdt_start();
}
/* EC driver currently not unloadable */
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index aaf4e8f348cf301cf481ced72a81f8c0644c93e0..873e039ad4b70529c73f16a5d1fe6ae90e269908 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -276,29 +276,29 @@ static ssize_t show_state(struct device *dev, struct device_attribute *attr, cha
int count;
if (fps->control == 0xFFFFFFFF || fps->control > 100)
- count = snprintf(buf, PAGE_SIZE, "not-defined:");
+ count = scnprintf(buf, PAGE_SIZE, "not-defined:");
else
- count = snprintf(buf, PAGE_SIZE, "%lld:", fps->control);
+ count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
- count += snprintf(&buf[count], PAGE_SIZE, "not-defined:");
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
else
- count += snprintf(&buf[count], PAGE_SIZE, "%lld:", fps->trip_point);
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
if (fps->speed == 0xFFFFFFFF)
- count += snprintf(&buf[count], PAGE_SIZE, "not-defined:");
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
else
- count += snprintf(&buf[count], PAGE_SIZE, "%lld:", fps->speed);
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
if (fps->noise_level == 0xFFFFFFFF)
- count += snprintf(&buf[count], PAGE_SIZE, "not-defined:");
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
else
- count += snprintf(&buf[count], PAGE_SIZE, "%lld:", fps->noise_level * 100);
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
if (fps->power == 0xFFFFFFFF)
- count += snprintf(&buf[count], PAGE_SIZE, "not-defined\n");
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
else
- count += snprintf(&buf[count], PAGE_SIZE, "%lld\n", fps->power);
+ count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
return count;
}
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 3616daec650b1fd2a8b25ceb99bcadcd2d10c6be..43411a7457cd7f4520eb80bd05aa73d724db616d 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -190,7 +190,7 @@ extern struct acpi_ec *first_ec;
/* External interfaces use first EC only, so remember */
typedef int (*acpi_ec_query_func) (void *data);
-int acpi_ec_init(void);
+void acpi_ec_init(void);
void acpi_ec_ecdt_probe(void);
void acpi_ec_dsdt_probe(void);
void acpi_ec_block_transactions(void);
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index d1e666ef3fcc886eb48772419aa891b78b039bc6..f92df2533e7ec8331dc7875efccdd9bef00b3a9f 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -153,7 +153,7 @@ static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
buf[0] = '\0';
for (i = 0, entry = table; i < size; i++, entry++)
if (word & entry->bit)
- len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
+ len += scnprintf(buf + len, sizeof(buf) - len, "%s%s",
len ? " " : "", entry->desc);
dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);