staging: gasket: core: add platform device add and remove functions
Add support for platform devices in the gasket framework.
Change-Id: I1e3625f9222b37925a2a672c9ea6eed31aefa35f
Signed-off-by: Todd Poynor <toddpoynor@google.com>
diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 1cbae4d..65b3ab2 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -24,6 +24,7 @@
#include <linux/init.h>
#include <linux/of.h>
#include <linux/pid_namespace.h>
+#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/sched.h>
@@ -669,6 +670,25 @@
}
/*
+ * Registered driver descriptor lookup for platform devices.
+ * Caller must hold g_mutex.
+ */
+static struct gasket_internal_desc *
+lookup_platform_internal_desc(struct platform_device *pdev)
+{
+ int i;
+
+ __must_hold(&g_mutex);
+ for (i = 0; i < GASKET_FRAMEWORK_DESC_MAX; i++) {
+ if (g_descs[i].driver_desc &&
+ strcmp(g_descs[i].driver_desc->name, pdev->name) == 0)
+ return &g_descs[i];
+ }
+
+ return NULL;
+}
+
+/*
* Verifies that the user has permissions to perform the requested mapping and
* that the provided descriptor/range is of adequate size to hold the range to
* be mapped.
@@ -1557,6 +1577,72 @@
}
EXPORT_SYMBOL(gasket_pci_remove_device);
+/* Add platform gasket device. Called by Gasket device probe function. */
+int gasket_platform_add_device(struct platform_device *pdev,
+ struct gasket_dev **gasket_devp)
+{
+ int ret;
+ struct gasket_internal_desc *internal_desc;
+ struct gasket_dev *gasket_dev;
+ struct device *parent;
+
+ dev_dbg(&pdev->dev, "add platform gasket device\n");
+
+ mutex_lock(&g_mutex);
+ internal_desc = lookup_platform_internal_desc(pdev);
+ mutex_unlock(&g_mutex);
+ if (!internal_desc) {
+ dev_err(&pdev->dev,
+ "%s called for unknown driver type\n", __func__);
+ return -ENODEV;
+ }
+
+ parent = &pdev->dev;
+ ret = __gasket_add_device(parent, internal_desc, &gasket_dev);
+ if (ret)
+ return ret;
+
+ gasket_dev->platform_dev = pdev;
+ *gasket_devp = gasket_dev;
+ return 0;
+}
+EXPORT_SYMBOL(gasket_platform_add_device);
+
+/* Remove a platform gasket device. */
+void gasket_platform_remove_device(struct platform_device *pdev)
+{
+ int i;
+ struct gasket_internal_desc *internal_desc;
+ struct gasket_dev *gasket_dev = NULL;
+
+ /* Find the device desc. */
+ mutex_lock(&g_mutex);
+ internal_desc = lookup_platform_internal_desc(pdev);
+ mutex_unlock(&g_mutex);
+ if (!internal_desc)
+ return;
+
+ /* Now find the specific device */
+ mutex_lock(&internal_desc->mutex);
+ for (i = 0; i < GASKET_DEV_MAX; i++) {
+ if (internal_desc->devs[i] &&
+ internal_desc->devs[i]->platform_dev == pdev) {
+ gasket_dev = internal_desc->devs[i];
+ break;
+ }
+ }
+ mutex_unlock(&internal_desc->mutex);
+
+ if (!gasket_dev)
+ return;
+
+ dev_dbg(gasket_dev->dev, "remove %s platform gasket device\n",
+ internal_desc->driver_desc->name);
+
+ __gasket_remove_device(internal_desc, gasket_dev);
+}
+EXPORT_SYMBOL(gasket_platform_remove_device);
+
/**
* Lookup a name by number in a num_name table.
* @num: Number to lookup.
diff --git a/drivers/staging/gasket/gasket_core.h b/drivers/staging/gasket/gasket_core.h
index ef7cf16..75ad11b 100644
--- a/drivers/staging/gasket/gasket_core.h
+++ b/drivers/staging/gasket/gasket_core.h
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -265,9 +266,12 @@
/* Device info */
struct device *dev;
- /* PCI subsystem metadata. */
+ /* PCI device pointer for PCI devices */
struct pci_dev *pci_dev;
+ /* Platform device pointer for platform devices */
+ struct platform_device *platform_dev;
+
/* This device's index into internal_desc->devs. */
int dev_idx;
@@ -539,6 +543,13 @@
/* Remove a PCI gasket device. */
void gasket_pci_remove_device(struct pci_dev *pci_dev);
+/* Add a platform gasket device. */
+int gasket_platform_add_device(struct platform_device *pdev,
+ struct gasket_dev **gasket_devp);
+
+/* Remove a platform gasket device. */
+void gasket_platform_remove_device(struct platform_device *pdev);
+
/* Enable a Gasket device. */
int gasket_enable_device(struct gasket_dev *gasket_dev);
