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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236// 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);}
const 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_flex(*module, interfaces, num_interfaces); 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);}