This driver is for the Greybus Bridged Phy class. It implements a bus
where all bridged phy devices hang off of, and provides the framework
for the Greybus Bridged phy drivers to plug into.
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/greybus/gbphy.c | 360 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/greybus/gbphy.h | 110 ++++++++++++++
2 files changed, 470 insertions(+)
--- /dev/null
+++ b/drivers/greybus/gbphy.c
@@ -0,0 +1,360 @@
+/*
+ * Greybus Bridged-Phy Bus driver
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+
+#include "greybus.h"
+#include "gbphy.h"
+
+#define GB_GBPHY_AUTOSUSPEND_MS 3000
+
+struct gbphy_host {
+ struct gb_bundle *bundle;
+ struct list_head devices;
+};
+
+static DEFINE_IDA(gbphy_id);
+
+static ssize_t protocol_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+
+ return sprintf(buf, "0x%02x\n", gbphy_dev->cport_desc->protocol_id);
+}
+static DEVICE_ATTR_RO(protocol_id);
+
+static struct attribute *gbphy_dev_attrs[] = {
+ &dev_attr_protocol_id.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(gbphy_dev);
+
+static void gbphy_dev_release(struct device *dev)
+{
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+
+ ida_simple_remove(&gbphy_id, gbphy_dev->id);
+ kfree(gbphy_dev);
+}
+
+#ifdef CONFIG_PM
+static int gb_gbphy_idle(struct device *dev)
+{
+ pm_runtime_mark_last_busy(dev);
+ pm_request_autosuspend(dev);
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops gb_gbphy_pm_ops = {
+ SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend,
+ pm_generic_runtime_resume,
+ gb_gbphy_idle)
+};
+
+static struct device_type greybus_gbphy_dev_type = {
+ .name = "gbphy_device",
+ .release = gbphy_dev_release,
+ .pm = &gb_gbphy_pm_ops,
+};
+
+static int gbphy_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+ struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc;
+ struct gb_bundle *bundle = gbphy_dev->bundle;
+ struct gb_interface *intf = bundle->intf;
+ struct gb_module *module = intf->module;
+ struct gb_host_device *hd = intf->hd;
+
+ if (add_uevent_var(env, "BUS=%u", hd->bus_id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "MODULE=%u", module->module_id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "INTERFACE=%u", intf->interface_id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "GREYBUS_ID=%08x/%08x",
+ intf->vendor_id, intf->product_id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "BUNDLE=%u", gbphy_dev->bundle->id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "BUNDLE_CLASS=%02x", bundle->class))
+ return -ENOMEM;
+ if (add_uevent_var(env, "GBPHY=%u", gbphy_dev->id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "PROTOCOL_ID=%02x", cport_desc->protocol_id))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static const struct gbphy_device_id *
+gbphy_dev_match_id(struct gbphy_device *gbphy_dev, struct gbphy_driver
*gbphy_drv)
+{
+ const struct gbphy_device_id *id = gbphy_drv->id_table;
+
+ if (!id)
+ return NULL;
+
+ for (; id->protocol_id; id++)
+ if (id->protocol_id == gbphy_dev->cport_desc->protocol_id)
+ return id;
+
+ return NULL;
+}
+
+static int gbphy_dev_match(struct device *dev, struct device_driver *drv)
+{
+ struct gbphy_driver *gbphy_drv = to_gbphy_driver(drv);
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+ const struct gbphy_device_id *id;
+
+ id = gbphy_dev_match_id(gbphy_dev, gbphy_drv);
+ if (id)
+ return 1;
+
+ return 0;
+}
+
+static int gbphy_dev_probe(struct device *dev)
+{
+ struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver);
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+ const struct gbphy_device_id *id;
+ int ret;
+
+ id = gbphy_dev_match_id(gbphy_dev, gbphy_drv);
+ if (!id)
+ return -ENODEV;
+
+ /* for old kernels we need get_sync to resume parent devices */
+ ret = gb_pm_runtime_get_sync(gbphy_dev->bundle);
+ if (ret < 0)
+ return ret;
+
+ pm_runtime_set_autosuspend_delay(dev, GB_GBPHY_AUTOSUSPEND_MS);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ /*
+ * Drivers should call put on the gbphy dev before returning
+ * from probe if they support runtime pm.
+ */
+ ret = gbphy_drv->probe(gbphy_dev, id);
+ if (ret) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_put_noidle(dev);
+ pm_runtime_dont_use_autosuspend(dev);
+ }
+
+ gb_pm_runtime_put_autosuspend(gbphy_dev->bundle);
+
+ return ret;
+}
+
+static int gbphy_dev_remove(struct device *dev)
+{
+ struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver);
+ struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+
+ gbphy_drv->remove(gbphy_dev);
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_put_noidle(dev);
+ pm_runtime_dont_use_autosuspend(dev);
+
+ return 0;
+}
+
+static struct bus_type gbphy_bus_type = {
+ .name = "gbphy",
+ .match = gbphy_dev_match,
+ .probe = gbphy_dev_probe,
+ .remove = gbphy_dev_remove,
+ .uevent = gbphy_dev_uevent,
+};
+
+int gb_gbphy_register_driver(struct gbphy_driver *driver,
+ struct module *owner, const char *mod_name)
+{
+ int retval;
+
+ if (greybus_disabled())
+ return -ENODEV;
+
+ driver->driver.bus = &gbphy_bus_type;
+ driver->driver.name = driver->name;
+ driver->driver.owner = owner;
+ driver->driver.mod_name = mod_name;
+
+ retval = driver_register(&driver->driver);
+ if (retval)
+ return retval;
+
+ pr_info("registered new driver %s\n", driver->name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gb_gbphy_register_driver);
+
+void gb_gbphy_deregister_driver(struct gbphy_driver *driver)
+{
+ driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(gb_gbphy_deregister_driver);
+
+static struct gbphy_device *gb_gbphy_create_dev(struct gb_bundle *bundle,
+ struct greybus_descriptor_cport *cport_desc)
+{
+ struct gbphy_device *gbphy_dev;
+ int retval;
+ int id;
+
+ id = ida_simple_get(&gbphy_id, 1, 0, GFP_KERNEL);
+ if (id < 0)
+ return ERR_PTR(id);
+
+ gbphy_dev = kzalloc(sizeof(*gbphy_dev), GFP_KERNEL);
+ if (!gbphy_dev) {
+ ida_simple_remove(&gbphy_id, id);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ gbphy_dev->id = id;
+ gbphy_dev->bundle = bundle;
+ gbphy_dev->cport_desc = cport_desc;
+ gbphy_dev->dev.parent = &bundle->dev;
+ gbphy_dev->dev.bus = &gbphy_bus_type;
+ gbphy_dev->dev.type = &greybus_gbphy_dev_type;
+ gbphy_dev->dev.groups = gbphy_dev_groups;
+ gbphy_dev->dev.dma_mask = bundle->dev.dma_mask;
+ dev_set_name(&gbphy_dev->dev, "gbphy%d", id);
+
+ retval = device_register(&gbphy_dev->dev);
+ if (retval) {
+ put_device(&gbphy_dev->dev);
+ return ERR_PTR(retval);
+ }
+
+ return gbphy_dev;
+}
+
+static void gb_gbphy_disconnect(struct gb_bundle *bundle)
+{
+ struct gbphy_host *gbphy_host = greybus_get_drvdata(bundle);
+ struct gbphy_device *gbphy_dev, *temp;
+ int ret;
+
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (ret < 0)
+ gb_pm_runtime_get_noresume(bundle);
+
+ list_for_each_entry_safe(gbphy_dev, temp, &gbphy_host->devices, list) {
+ list_del(&gbphy_dev->list);
+ device_unregister(&gbphy_dev->dev);
+ }
+
+ kfree(gbphy_host);
+}
+
+static int gb_gbphy_probe(struct gb_bundle *bundle,
+ const struct greybus_bundle_id *id)
+{
+ struct gbphy_host *gbphy_host;
+ struct gbphy_device *gbphy_dev;
+ int i;
+
+ if (bundle->num_cports == 0)
+ return -ENODEV;
+
+ gbphy_host = kzalloc(sizeof(*gbphy_host), GFP_KERNEL);
+ if (!gbphy_host)
+ return -ENOMEM;
+
+ gbphy_host->bundle = bundle;
+ INIT_LIST_HEAD(&gbphy_host->devices);
+ greybus_set_drvdata(bundle, gbphy_host);
+
+ /*
+ * Create a bunch of children devices, one per cport, and bind the
+ * bridged phy drivers to them.
+ */
+ for (i = 0; i < bundle->num_cports; ++i) {
+ gbphy_dev = gb_gbphy_create_dev(bundle, &bundle->cport_desc[i]);
+ if (IS_ERR(gbphy_dev)) {
+ gb_gbphy_disconnect(bundle);
+ return PTR_ERR(gbphy_dev);
+ }
+ list_add(&gbphy_dev->list, &gbphy_host->devices);
+ }
+
+ gb_pm_runtime_put_autosuspend(bundle);
+
+ return 0;
+}
+
+static const struct greybus_bundle_id gb_gbphy_id_table[] = {
+ { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_BRIDGED_PHY) },
+ { },
+};
+MODULE_DEVICE_TABLE(greybus, gb_gbphy_id_table);
+
+static struct greybus_driver gb_gbphy_driver = {
+ .name = "gbphy",
+ .probe = gb_gbphy_probe,
+ .disconnect = gb_gbphy_disconnect,
+ .id_table = gb_gbphy_id_table,
+};
+
+static int __init gbphy_init(void)
+{
+ int retval;
+
+ retval = bus_register(&gbphy_bus_type);
+ if (retval) {
+ pr_err("gbphy bus register failed (%d)\n", retval);
+ return retval;
+ }
+
+ retval = greybus_register(&gb_gbphy_driver);
+ if (retval) {
+ pr_err("error registering greybus driver\n");
+ goto error_gbphy;
+ }
+
+ return 0;
+
+error_gbphy:
+ bus_unregister(&gbphy_bus_type);
+ ida_destroy(&gbphy_id);
+ return retval;
+}
+module_init(gbphy_init);
+
+static void __exit gbphy_exit(void)
+{
+ greybus_deregister(&gb_gbphy_driver);
+ bus_unregister(&gbphy_bus_type);
+ ida_destroy(&gbphy_id);
+}
+module_exit(gbphy_exit);
+
+MODULE_LICENSE("GPL v2");
--- /dev/null
+++ b/drivers/greybus/gbphy.h
@@ -0,0 +1,110 @@
+/*
+ * Greybus Bridged-Phy Bus driver
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __GBPHY_H
+#define __GBPHY_H
+
+struct gbphy_device {
+ u32 id;
+ struct greybus_descriptor_cport *cport_desc;
+ struct gb_bundle *bundle;
+ struct list_head list;
+ struct device dev;
+};
+#define to_gbphy_dev(d) container_of(d, struct gbphy_device, dev)
+
+static inline void *gb_gbphy_get_data(struct gbphy_device *gdev)
+{
+ return dev_get_drvdata(&gdev->dev);
+}
+
+static inline void gb_gbphy_set_data(struct gbphy_device *gdev, void *data)
+{
+ dev_set_drvdata(&gdev->dev, data);
+}
+
+struct gbphy_device_id {
+ __u8 protocol_id;
+};
+
+#define GBPHY_PROTOCOL(p) \
+ .protocol_id = (p),
+
+struct gbphy_driver {
+ const char *name;
+ int (*probe)(struct gbphy_device *,
+ const struct gbphy_device_id *id);
+ void (*remove)(struct gbphy_device *);
+ const struct gbphy_device_id *id_table;
+
+ struct device_driver driver;
+};
+#define to_gbphy_driver(d) container_of(d, struct gbphy_driver, driver)
+
+int gb_gbphy_register_driver(struct gbphy_driver *driver,
+ struct module *owner, const char *mod_name);
+void gb_gbphy_deregister_driver(struct gbphy_driver *driver);
+
+#define gb_gbphy_register(driver) \
+ gb_gbphy_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
+#define gb_gbphy_deregister(driver) \
+ gb_gbphy_deregister_driver(driver)
+
+/**
+ * module_gbphy_driver() - Helper macro for registering a gbphy driver
+ * @__gbphy_driver: gbphy_driver structure
+ *
+ * Helper macro for gbphy drivers to set up proper module init / exit
+ * functions. Replaces module_init() and module_exit() and keeps people from
+ * printing pointless things to the kernel log when their driver is loaded.
+ */
+#define module_gbphy_driver(__gbphy_driver) \
+ module_driver(__gbphy_driver, gb_gbphy_register, gb_gbphy_deregister)
+
+#ifdef CONFIG_PM
+static inline int gbphy_runtime_get_sync(struct gbphy_device *gbphy_dev)
+{
+ struct device *dev = &gbphy_dev->dev;
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync failed: %d\n", ret);
+ pm_runtime_put_noidle(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static inline void gbphy_runtime_put_autosuspend(struct gbphy_device
*gbphy_dev)
+{
+ struct device *dev = &gbphy_dev->dev;
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+}
+
+static inline void gbphy_runtime_get_noresume(struct gbphy_device *gbphy_dev)
+{
+ pm_runtime_get_noresume(&gbphy_dev->dev);
+}
+
+static inline void gbphy_runtime_put_noidle(struct gbphy_device *gbphy_dev)
+{
+ pm_runtime_put_noidle(&gbphy_dev->dev);
+}
+#else
+static inline int gbphy_runtime_get_sync(struct gbphy_device *gbphy_dev) {
return 0; }
+static inline void gbphy_runtime_put_autosuspend(struct gbphy_device
*gbphy_dev) {}
+static inline void gbphy_runtime_get_noresume(struct gbphy_device *gbphy_dev)
{}
+static inline void gbphy_runtime_put_noidle(struct gbphy_device *gbphy_dev) {}
+#endif
+
+#endif /* __GBPHY_H */
+
