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path: root/drivers/base/platform.c
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Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r--drivers/base/platform.c113
1 files changed, 77 insertions, 36 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c0b8df38402..eee48c49f5d 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -13,6 +13,7 @@
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
+#include <linux/of_irq.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
@@ -29,9 +30,6 @@
/* For automatically allocated device IDs */
static DEFINE_IDA(platform_devid_ida);
-#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
- driver))
-
struct device platform_bus = {
.init_name = "platform",
};
@@ -46,8 +44,8 @@ EXPORT_SYMBOL_GPL(platform_bus);
* manipulate any relevant information in the pdev_archdata they can do:
*
* platform_device_alloc()
- * ... manipulate ...
- * platform_device_add()
+ * ... manipulate ...
+ * platform_device_add()
*
* And if they don't care they can just call platform_device_register() and
* everything will just work out.
@@ -90,7 +88,16 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
return -ENXIO;
return dev->archdata.irqs[num];
#else
- struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
+ struct resource *r;
+ if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
+ int ret;
+
+ ret = of_irq_get(dev->dev.of_node, num);
+ if (ret >= 0 || ret == -EPROBE_DEFER)
+ return ret;
+ }
+
+ r = platform_get_resource(dev, IORESOURCE_IRQ, num);
return r ? r->start : -ENXIO;
#endif
@@ -129,9 +136,17 @@ EXPORT_SYMBOL_GPL(platform_get_resource_byname);
*/
int platform_get_irq_byname(struct platform_device *dev, const char *name)
{
- struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
- name);
+ struct resource *r;
+
+ if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
+ int ret;
+ ret = of_irq_get_byname(dev->dev.of_node, name);
+ if (ret >= 0 || ret == -EPROBE_DEFER)
+ return ret;
+ }
+
+ r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
return r ? r->start : -ENXIO;
}
EXPORT_SYMBOL_GPL(platform_get_irq_byname);
@@ -326,9 +341,7 @@ int platform_device_add(struct platform_device *pdev)
}
if (p && insert_resource(p, r)) {
- printk(KERN_ERR
- "%s: failed to claim resource %d\n",
- dev_name(&pdev->dev), i);
+ dev_err(&pdev->dev, "failed to claim resource %d\n", i);
ret = -EBUSY;
goto failed;
}
@@ -437,7 +450,7 @@ struct platform_device *platform_device_register_full(
goto err_alloc;
pdev->dev.parent = pdevinfo->parent;
- ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle);
+ ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion);
if (pdevinfo->dma_mask) {
/*
@@ -468,7 +481,7 @@ struct platform_device *platform_device_register_full(
ret = platform_device_add(pdev);
if (ret) {
err:
- ACPI_HANDLE_SET(&pdev->dev, NULL);
+ ACPI_COMPANION_SET(&pdev->dev, NULL);
kfree(pdev->dev.dma_mask);
err_alloc:
@@ -486,13 +499,17 @@ static int platform_drv_probe(struct device *_dev)
struct platform_device *dev = to_platform_device(_dev);
int ret;
- if (ACPI_HANDLE(_dev))
- acpi_dev_pm_attach(_dev, true);
+ acpi_dev_pm_attach(_dev, true);
ret = drv->probe(dev);
- if (ret && ACPI_HANDLE(_dev))
+ if (ret)
acpi_dev_pm_detach(_dev, true);
+ if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
+ dev_warn(_dev, "probe deferral not supported\n");
+ ret = -ENXIO;
+ }
+
return ret;
}
@@ -508,8 +525,7 @@ static int platform_drv_remove(struct device *_dev)
int ret;
ret = drv->remove(dev);
- if (ACPI_HANDLE(_dev))
- acpi_dev_pm_detach(_dev, true);
+ acpi_dev_pm_detach(_dev, true);
return ret;
}
@@ -520,16 +536,18 @@ static void platform_drv_shutdown(struct device *_dev)
struct platform_device *dev = to_platform_device(_dev);
drv->shutdown(dev);
- if (ACPI_HANDLE(_dev))
- acpi_dev_pm_detach(_dev, true);
+ acpi_dev_pm_detach(_dev, true);
}
/**
- * platform_driver_register - register a driver for platform-level devices
+ * __platform_driver_register - register a driver for platform-level devices
* @drv: platform driver structure
+ * @owner: owning module/driver
*/
-int platform_driver_register(struct platform_driver *drv)
+int __platform_driver_register(struct platform_driver *drv,
+ struct module *owner)
{
+ drv->driver.owner = owner;
drv->driver.bus = &platform_bus_type;
if (drv->probe)
drv->driver.probe = platform_drv_probe;
@@ -540,7 +558,7 @@ int platform_driver_register(struct platform_driver *drv)
return driver_register(&drv->driver);
}
-EXPORT_SYMBOL_GPL(platform_driver_register);
+EXPORT_SYMBOL_GPL(__platform_driver_register);
/**
* platform_driver_unregister - unregister a driver for platform-level devices
@@ -566,6 +584,8 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
* into system-on-chip processors, where the controller devices have been
* configured as part of board setup.
*
+ * Note that this is incompatible with deferred probing.
+ *
* Returns zero if the driver registered and bound to a device, else returns
* a negative error code and with the driver not registered.
*/
@@ -574,6 +594,12 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv,
{
int retval, code;
+ /*
+ * Prevent driver from requesting probe deferral to avoid further
+ * futile probe attempts.
+ */
+ drv->prevent_deferred_probe = true;
+
/* make sure driver won't have bind/unbind attributes */
drv->driver.suppress_bind_attrs = true;
@@ -666,15 +692,27 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
- int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
+ int len;
+
+ len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
+ if (len != -ENODEV)
+ return len;
+
+ len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
+ if (len != -ENODEV)
+ return len;
+
+ len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
+static DEVICE_ATTR_RO(modalias);
-static struct device_attribute platform_dev_attrs[] = {
- __ATTR_RO(modalias),
- __ATTR_NULL,
+static struct attribute *platform_dev_attrs[] = {
+ &dev_attr_modalias.attr,
+ NULL,
};
+ATTRIBUTE_GROUPS(platform_dev);
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
{
@@ -682,7 +720,11 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
int rc;
/* Some devices have extra OF data and an OF-style MODALIAS */
- rc = of_device_uevent_modalias(dev,env);
+ rc = of_device_uevent_modalias(dev, env);
+ if (rc != -ENODEV)
+ return rc;
+
+ rc = acpi_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
@@ -886,13 +928,12 @@ int platform_pm_restore(struct device *dev)
static const struct dev_pm_ops platform_dev_pm_ops = {
.runtime_suspend = pm_generic_runtime_suspend,
.runtime_resume = pm_generic_runtime_resume,
- .runtime_idle = pm_generic_runtime_idle,
USE_PLATFORM_PM_SLEEP_OPS
};
struct bus_type platform_bus_type = {
.name = "platform",
- .dev_attrs = platform_dev_attrs,
+ .dev_groups = platform_dev_groups,
.match = platform_match,
.uevent = platform_uevent,
.pm = &platform_dev_pm_ops,
@@ -1053,7 +1094,7 @@ void __init early_platform_driver_register_all(char *class_str)
* @epdrv: early platform driver structure
* @id: id to match against
*/
-static __init struct platform_device *
+static struct platform_device * __init
early_platform_match(struct early_platform_driver *epdrv, int id)
{
struct platform_device *pd;
@@ -1071,7 +1112,7 @@ early_platform_match(struct early_platform_driver *epdrv, int id)
* @epdrv: early platform driver structure
* @id: return true if id or above exists
*/
-static __init int early_platform_left(struct early_platform_driver *epdrv,
+static int __init early_platform_left(struct early_platform_driver *epdrv,
int id)
{
struct platform_device *pd;
@@ -1126,8 +1167,8 @@ static int __init early_platform_driver_probe_id(char *class_str,
switch (match_id) {
case EARLY_PLATFORM_ID_ERROR:
- pr_warning("%s: unable to parse %s parameter\n",
- class_str, epdrv->pdrv->driver.name);
+ pr_warn("%s: unable to parse %s parameter\n",
+ class_str, epdrv->pdrv->driver.name);
/* fall-through */
case EARLY_PLATFORM_ID_UNSET:
match = NULL;
@@ -1158,8 +1199,8 @@ static int __init early_platform_driver_probe_id(char *class_str,
}
if (epdrv->pdrv->probe(match))
- pr_warning("%s: unable to probe %s early.\n",
- class_str, match->name);
+ pr_warn("%s: unable to probe %s early.\n",
+ class_str, match->name);
else
n++;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 20:40:15 +0000