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