diff options
Diffstat (limited to 'drivers/greybus/bundle.c')
| -rw-r--r-- | drivers/greybus/bundle.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/drivers/greybus/bundle.c b/drivers/greybus/bundle.c new file mode 100644 index 000000000000..84660729538b --- /dev/null +++ b/drivers/greybus/bundle.c @@ -0,0 +1,252 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Greybus bundles + * + * Copyright 2014-2015 Google Inc. + * Copyright 2014-2015 Linaro Ltd. + */ + +#include <linux/greybus.h> +#include "greybus_trace.h" + +static ssize_t bundle_class_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + + return sprintf(buf, "0x%02x\n", bundle->class); +} +static DEVICE_ATTR_RO(bundle_class); + +static ssize_t bundle_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + + return sprintf(buf, "%u\n", bundle->id); +} +static DEVICE_ATTR_RO(bundle_id); + +static ssize_t state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + + if (!bundle->state) + return sprintf(buf, "\n"); + + return sprintf(buf, "%s\n", bundle->state); +} + +static ssize_t state_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + + kfree(bundle->state); + bundle->state = kstrdup(buf, GFP_KERNEL); + if (!bundle->state) + return -ENOMEM; + + /* Tell userspace that the file contents changed */ + sysfs_notify(&bundle->dev.kobj, NULL, "state"); + + return size; +} +static DEVICE_ATTR_RW(state); + +static struct attribute *bundle_attrs[] = { + &dev_attr_bundle_class.attr, + &dev_attr_bundle_id.attr, + &dev_attr_state.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(bundle); + +static struct gb_bundle *gb_bundle_find(struct gb_interface *intf, + u8 bundle_id) +{ + struct gb_bundle *bundle; + + list_for_each_entry(bundle, &intf->bundles, links) { + if (bundle->id == bundle_id) + return bundle; + } + + return NULL; +} + +static void gb_bundle_release(struct device *dev) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + + trace_gb_bundle_release(bundle); + + kfree(bundle->state); + kfree(bundle->cport_desc); + kfree(bundle); +} + +#ifdef CONFIG_PM +static void gb_bundle_disable_all_connections(struct gb_bundle *bundle) +{ + struct gb_connection *connection; + + list_for_each_entry(connection, &bundle->connections, bundle_links) + gb_connection_disable(connection); +} + +static void gb_bundle_enable_all_connections(struct gb_bundle *bundle) +{ + struct gb_connection *connection; + + list_for_each_entry(connection, &bundle->connections, bundle_links) + gb_connection_enable(connection); +} + +static int gb_bundle_suspend(struct device *dev) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + const struct dev_pm_ops *pm = dev->driver->pm; + int ret; + + if (pm && pm->runtime_suspend) { + ret = pm->runtime_suspend(&bundle->dev); + if (ret) + return ret; + } else { + gb_bundle_disable_all_connections(bundle); + } + + ret = gb_control_bundle_suspend(bundle->intf->control, bundle->id); + if (ret) { + if (pm && pm->runtime_resume) + ret = pm->runtime_resume(dev); + else + gb_bundle_enable_all_connections(bundle); + + return ret; + } + + return 0; +} + +static int gb_bundle_resume(struct device *dev) +{ + struct gb_bundle *bundle = to_gb_bundle(dev); + const struct dev_pm_ops *pm = dev->driver->pm; + int ret; + + ret = gb_control_bundle_resume(bundle->intf->control, bundle->id); + if (ret) + return ret; + + if (pm && pm->runtime_resume) { + ret = pm->runtime_resume(dev); + if (ret) + return ret; + } else { + gb_bundle_enable_all_connections(bundle); + } + + return 0; +} + +static int gb_bundle_idle(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + pm_request_autosuspend(dev); + + return 0; +} +#endif + +static const struct dev_pm_ops gb_bundle_pm_ops = { + SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle) +}; + +struct device_type greybus_bundle_type = { + .name = "greybus_bundle", + .release = gb_bundle_release, + .pm = &gb_bundle_pm_ops, +}; + +/* + * Create a gb_bundle structure to represent a discovered + * bundle. Returns a pointer to the new bundle or a null + * pointer if a failure occurs due to memory exhaustion. + */ +struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id, + u8 class) +{ + struct gb_bundle *bundle; + + if (bundle_id == BUNDLE_ID_NONE) { + dev_err(&intf->dev, "can't use bundle id %u\n", bundle_id); + return NULL; + } + + /* + * Reject any attempt to reuse a bundle id. We initialize + * these serially, so there's no need to worry about keeping + * the interface bundle list locked here. + */ + if (gb_bundle_find(intf, bundle_id)) { + dev_err(&intf->dev, "duplicate bundle id %u\n", bundle_id); + return NULL; + } + + bundle = kzalloc(sizeof(*bundle), GFP_KERNEL); + if (!bundle) + return NULL; + + bundle->intf = intf; + bundle->id = bundle_id; + bundle->class = class; + INIT_LIST_HEAD(&bundle->connections); + + bundle->dev.parent = &intf->dev; + bundle->dev.bus = &greybus_bus_type; + bundle->dev.type = &greybus_bundle_type; + bundle->dev.groups = bundle_groups; + bundle->dev.dma_mask = intf->dev.dma_mask; + device_initialize(&bundle->dev); + dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id); + + list_add(&bundle->links, &intf->bundles); + + trace_gb_bundle_create(bundle); + + return bundle; +} + +int gb_bundle_add(struct gb_bundle *bundle) +{ + int ret; + + ret = device_add(&bundle->dev); + if (ret) { + dev_err(&bundle->dev, "failed to register bundle: %d\n", ret); + return ret; + } + + trace_gb_bundle_add(bundle); + + return 0; +} + +/* + * Tear down a previously set up bundle. + */ +void gb_bundle_destroy(struct gb_bundle *bundle) +{ + trace_gb_bundle_destroy(bundle); + + if (device_is_registered(&bundle->dev)) + device_del(&bundle->dev); + + list_del(&bundle->links); + + put_device(&bundle->dev); +} |