4 * Copyright 2016 Google Inc.
5 * Copyright 2016 Linaro Ltd.
7 * Released under the GPLv2 only.
11 #include "greybus_trace.h"
14 static ssize_t eject_store(struct device *dev,
15 struct device_attribute *attr,
16 const char *buf, size_t len)
18 struct gb_module *module = to_gb_module(dev);
19 struct gb_interface *intf;
24 ret = kstrtol(buf, 0, &val);
31 for (i = 0; i < module->num_interfaces; ++i) {
32 intf = module->interfaces[i];
34 mutex_lock(&intf->mutex);
35 /* Set flag to prevent concurrent activation. */
37 gb_interface_disable(intf);
38 gb_interface_deactivate(intf);
39 mutex_unlock(&intf->mutex);
42 /* Tell the SVC to eject the primary interface. */
43 ret = gb_svc_intf_eject(module->hd->svc, module->module_id);
49 static DEVICE_ATTR_WO(eject);
51 static ssize_t module_id_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
54 struct gb_module *module = to_gb_module(dev);
56 return sprintf(buf, "%u\n", module->module_id);
58 static DEVICE_ATTR_RO(module_id);
60 static ssize_t num_interfaces_show(struct device *dev,
61 struct device_attribute *attr, char *buf)
63 struct gb_module *module = to_gb_module(dev);
65 return sprintf(buf, "%zu\n", module->num_interfaces);
67 static DEVICE_ATTR_RO(num_interfaces);
69 static struct attribute *module_attrs[] = {
71 &dev_attr_module_id.attr,
72 &dev_attr_num_interfaces.attr,
75 ATTRIBUTE_GROUPS(module);
77 static void gb_module_release(struct device *dev)
79 struct gb_module *module = to_gb_module(dev);
81 trace_gb_module_release(module);
86 struct device_type greybus_module_type = {
87 .name = "greybus_module",
88 .release = gb_module_release,
91 struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id,
92 size_t num_interfaces)
94 struct gb_interface *intf;
95 struct gb_module *module;
98 module = kzalloc(sizeof(*module) + num_interfaces * sizeof(intf),
104 module->module_id = module_id;
105 module->num_interfaces = num_interfaces;
107 module->dev.parent = &hd->dev;
108 module->dev.bus = &greybus_bus_type;
109 module->dev.type = &greybus_module_type;
110 module->dev.groups = module_groups;
111 module->dev.dma_mask = hd->dev.dma_mask;
112 device_initialize(&module->dev);
113 dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id);
115 trace_gb_module_create(module);
117 for (i = 0; i < num_interfaces; ++i) {
118 intf = gb_interface_create(module, module_id + i);
120 dev_err(&module->dev, "failed to create interface %u\n",
122 goto err_put_interfaces;
124 module->interfaces[i] = intf;
130 for (--i; i > 0; --i)
131 gb_interface_put(module->interfaces[i]);
133 put_device(&module->dev);
139 * Register and enable an interface after first attempting to activate it.
141 static void gb_module_register_interface(struct gb_interface *intf)
143 struct gb_module *module = intf->module;
144 u8 intf_id = intf->interface_id;
148 mutex_lock(&intf->mutex);
151 ret = gb_interface_activate(intf);
156 dev_err(&module->dev, "failed to activate interface %u: %d\n",
160 * -EAGAIN indicates that the Greybus operation
161 * interface_activate determined the remote interface to be
162 * UniPro-only. At present, we assume a UniPro-only module
163 * to be a Greybus module that failed to send its mailbox
164 * poke. There is some reason to believe that this is
165 * because of a bug in the ES3 bootrom. If we exhause our
166 * retries trying to activate such an interface, convert
167 * the error code back into a "no device" error.
172 gb_interface_add(intf);
176 ret = gb_interface_add(intf);
178 goto err_interface_deactivate;
180 ret = gb_interface_enable(intf);
182 dev_err(&module->dev, "failed to enable interface %u: %d\n",
184 goto err_interface_deactivate;
187 mutex_unlock(&intf->mutex);
191 err_interface_deactivate:
192 gb_interface_deactivate(intf);
194 mutex_unlock(&intf->mutex);
197 static void gb_module_deregister_interface(struct gb_interface *intf)
199 /* Mark as disconnected to prevent I/O during disable. */
200 if (intf->module->disconnected)
201 intf->disconnected = true;
203 mutex_lock(&intf->mutex);
204 gb_interface_disable(intf);
205 gb_interface_deactivate(intf);
206 mutex_unlock(&intf->mutex);
208 gb_interface_del(intf);
211 /* Register a module and its interfaces. */
212 int gb_module_add(struct gb_module *module)
217 ret = device_add(&module->dev);
219 dev_err(&module->dev, "failed to register module: %d\n", ret);
223 trace_gb_module_add(module);
225 for (i = 0; i < module->num_interfaces; ++i)
226 gb_module_register_interface(module->interfaces[i]);
231 /* Deregister a module and its interfaces. */
232 void gb_module_del(struct gb_module *module)
236 for (i = 0; i < module->num_interfaces; ++i)
237 gb_module_deregister_interface(module->interfaces[i]);
239 trace_gb_module_del(module);
241 device_del(&module->dev);
244 void gb_module_put(struct gb_module *module)
248 for (i = 0; i < module->num_interfaces; ++i)
249 gb_interface_put(module->interfaces[i]);
251 put_device(&module->dev);