// SPDX-License-Identifier: GPL-2.0 /* * Greybus Module code * * Copyright 2016 Google Inc. * Copyright 2016 Linaro Ltd. */ #include <linux/greybus.h> #include "greybus_trace.h" static ssize_t eject_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct gb_module *module = to_gb_module(dev); struct gb_interface *intf; size_t i; long val; int ret; ret = kstrtol(buf, 0, &val); if (ret) return ret; if (!val) return len; for (i = 0; i < module->num_interfaces; ++i) { intf = module->interfaces[i]; mutex_lock(&intf->mutex); /* Set flag to prevent concurrent activation. */ intf->ejected = true; gb_interface_disable(intf); gb_interface_deactivate(intf); mutex_unlock(&intf->mutex); } /* Tell the SVC to eject the primary interface. */ ret = gb_svc_intf_eject(module->hd->svc, module->module_id); if (ret) return ret; return len; } static DEVICE_ATTR_WO(eject); static ssize_t module_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gb_module *module = to_gb_module(dev); return sprintf(buf, "%u\n", module->module_id); } static DEVICE_ATTR_RO(module_id); static ssize_t num_interfaces_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gb_module *module = to_gb_module(dev); return sprintf(buf, "%zu\n", module->num_interfaces); } static DEVICE_ATTR_RO(num_interfaces); static struct attribute *module_attrs[] = { &dev_attr_eject.attr, &dev_attr_module_id.attr, &dev_attr_num_interfaces.attr, NULL, }; ATTRIBUTE_GROUPS(module); static void gb_module_release(struct device *dev) { struct gb_module *module = to_gb_module(dev); trace_gb_module_release(module); kfree(module); } struct device_type greybus_module_type = { .name = "greybus_module", .release = gb_module_release, }; struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id, size_t num_interfaces) { struct gb_interface *intf; struct gb_module *module; int i; module = kzalloc(struct_size(module, interfaces, num_interfaces), GFP_KERNEL); if (!module) return NULL; module->hd = hd; module->module_id = module_id; module->num_interfaces = num_interfaces; module->dev.parent = &hd->dev; module->dev.bus = &greybus_bus_type; module->dev.type = &greybus_module_type; module->dev.groups = module_groups; module->dev.dma_mask = hd->dev.dma_mask; device_initialize(&module->dev); dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id); trace_gb_module_create(module); for (i = 0; i < num_interfaces; ++i) { intf = gb_interface_create(module, module_id + i); if (!intf) { dev_err(&module->dev, "failed to create interface %u\n", module_id + i); goto err_put_interfaces; } module->interfaces[i] = intf; } return module; err_put_interfaces: for (--i; i >= 0; --i) gb_interface_put(module->interfaces[i]); put_device(&module->dev); return NULL; } /* * Register and enable an interface after first attempting to activate it. */ static void gb_module_register_interface(struct gb_interface *intf) { struct gb_module *module = intf->module; u8 intf_id = intf->interface_id; int ret; mutex_lock(&intf->mutex); ret = gb_interface_activate(intf); if (ret) { if (intf->type != GB_INTERFACE_TYPE_DUMMY) { dev_err(&module->dev, "failed to activate interface %u: %d\n", intf_id, ret); } gb_interface_add(intf); goto err_unlock; } ret = gb_interface_add(intf); if (ret) goto err_interface_deactivate; ret = gb_interface_enable(intf); if (ret) { dev_err(&module->dev, "failed to enable interface %u: %d\n", intf_id, ret); goto err_interface_deactivate; } mutex_unlock(&intf->mutex); return; err_interface_deactivate: gb_interface_deactivate(intf); err_unlock: mutex_unlock(&intf->mutex); } static void gb_module_deregister_interface(struct gb_interface *intf) { /* Mark as disconnected to prevent I/O during disable. */ if (intf->module->disconnected) intf->disconnected = true; mutex_lock(&intf->mutex); intf->removed = true; gb_interface_disable(intf); gb_interface_deactivate(intf); mutex_unlock(&intf->mutex); gb_interface_del(intf); } /* Register a module and its interfaces. */ int gb_module_add(struct gb_module *module) { size_t i; int ret; ret = device_add(&module->dev); if (ret) { dev_err(&module->dev, "failed to register module: %d\n", ret); return ret; } trace_gb_module_add(module); for (i = 0; i < module->num_interfaces; ++i) gb_module_register_interface(module->interfaces[i]); return 0; } /* Deregister a module and its interfaces. */ void gb_module_del(struct gb_module *module) { size_t i; for (i = 0; i < module->num_interfaces; ++i) gb_module_deregister_interface(module->interfaces[i]); trace_gb_module_del(module); device_del(&module->dev); } void gb_module_put(struct gb_module *module) { size_t i; for (i = 0; i < module->num_interfaces; ++i) gb_interface_put(module->interfaces[i]); put_device(&module->dev); }