2 * Greybus CPort control protocol.
4 * Copyright 2015 Google Inc.
5 * Copyright 2015 Linaro Ltd.
7 * Released under the GPLv2 only.
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
15 /* Highest control-protocol version supported */
16 #define GB_CONTROL_VERSION_MAJOR 0
17 #define GB_CONTROL_VERSION_MINOR 1
20 static int gb_control_get_version(struct gb_control *control)
22 struct gb_interface *intf = control->connection->intf;
23 struct gb_control_version_request request;
24 struct gb_control_version_response response;
27 request.major = GB_CONTROL_VERSION_MAJOR;
28 request.minor = GB_CONTROL_VERSION_MINOR;
30 ret = gb_operation_sync(control->connection,
31 GB_CONTROL_TYPE_VERSION,
32 &request, sizeof(request), &response,
36 "failed to get control-protocol version: %d\n",
41 if (response.major > request.major) {
43 "unsupported major control-protocol version (%u > %u)\n",
44 response.major, request.major);
48 control->protocol_major = response.major;
49 control->protocol_minor = response.minor;
51 dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major,
57 static int gb_control_get_bundle_version(struct gb_control *control,
58 struct gb_bundle *bundle)
60 struct gb_interface *intf = control->connection->intf;
61 struct gb_control_bundle_version_request request;
62 struct gb_control_bundle_version_response response;
65 request.bundle_id = bundle->id;
67 ret = gb_operation_sync(control->connection,
68 GB_CONTROL_TYPE_BUNDLE_VERSION,
69 &request, sizeof(request),
70 &response, sizeof(response));
73 "failed to get bundle %u class version: %d\n",
78 bundle->class_major = response.major;
79 bundle->class_minor = response.minor;
81 dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id,
82 response.major, response.minor);
87 int gb_control_get_bundle_versions(struct gb_control *control)
89 struct gb_interface *intf = control->connection->intf;
90 struct gb_bundle *bundle;
93 if (!control->has_bundle_version)
96 list_for_each_entry(bundle, &intf->bundles, links) {
97 ret = gb_control_get_bundle_version(control, bundle);
105 /* Get Manifest's size from the interface */
106 int gb_control_get_manifest_size_operation(struct gb_interface *intf)
108 struct gb_control_get_manifest_size_response response;
109 struct gb_connection *connection = intf->control->connection;
112 ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE,
113 NULL, 0, &response, sizeof(response));
115 dev_err(&connection->intf->dev,
116 "failed to get manifest size: %d\n", ret);
120 return le16_to_cpu(response.size);
123 /* Reads Manifest from the interface */
124 int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
127 struct gb_connection *connection = intf->control->connection;
129 return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST,
130 NULL, 0, manifest, size);
133 int gb_control_connected_operation(struct gb_control *control, u16 cport_id)
135 struct gb_control_connected_request request;
137 request.cport_id = cpu_to_le16(cport_id);
138 return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED,
139 &request, sizeof(request), NULL, 0);
142 int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id)
144 struct gb_control_disconnected_request request;
146 request.cport_id = cpu_to_le16(cport_id);
147 return gb_operation_sync(control->connection,
148 GB_CONTROL_TYPE_DISCONNECTED, &request,
149 sizeof(request), NULL, 0);
152 int gb_control_mode_switch_operation(struct gb_control *control)
154 return gb_operation_unidirectional(control->connection,
155 GB_CONTROL_TYPE_MODE_SWITCH,
159 int gb_control_timesync_enable(struct gb_control *control, u8 count,
160 u64 frame_time, u32 strobe_delay, u32 refclk)
162 struct gb_control_timesync_enable_request request;
164 request.count = count;
165 request.frame_time = cpu_to_le64(frame_time);
166 request.strobe_delay = cpu_to_le32(strobe_delay);
167 request.refclk = cpu_to_le32(refclk);
168 return gb_operation_sync(control->connection,
169 GB_CONTROL_TYPE_TIMESYNC_ENABLE, &request,
170 sizeof(request), NULL, 0);
173 int gb_control_timesync_disable(struct gb_control *control)
175 return gb_operation_sync(control->connection,
176 GB_CONTROL_TYPE_TIMESYNC_DISABLE, NULL, 0,
180 int gb_control_timesync_get_last_event(struct gb_control *control,
183 struct gb_control_timesync_get_last_event_response response;
186 ret = gb_operation_sync(control->connection,
187 GB_CONTROL_TYPE_TIMESYNC_GET_LAST_EVENT,
188 NULL, 0, &response, sizeof(response));
190 *frame_time = le64_to_cpu(response.frame_time);
194 int gb_control_timesync_authoritative(struct gb_control *control,
197 struct gb_control_timesync_authoritative_request request;
200 for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
201 request.frame_time[i] = cpu_to_le64(frame_time[i]);
203 return gb_operation_sync(control->connection,
204 GB_CONTROL_TYPE_TIMESYNC_AUTHORITATIVE,
205 &request, sizeof(request),
209 static ssize_t vendor_string_show(struct device *dev,
210 struct device_attribute *attr, char *buf)
212 struct gb_control *control = to_gb_control(dev);
214 return scnprintf(buf, PAGE_SIZE, "%s\n", control->vendor_string);
216 static DEVICE_ATTR_RO(vendor_string);
218 static ssize_t product_string_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
221 struct gb_control *control = to_gb_control(dev);
223 return scnprintf(buf, PAGE_SIZE, "%s\n", control->product_string);
225 static DEVICE_ATTR_RO(product_string);
227 static struct attribute *control_attrs[] = {
228 &dev_attr_vendor_string.attr,
229 &dev_attr_product_string.attr,
232 ATTRIBUTE_GROUPS(control);
234 static void gb_control_release(struct device *dev)
236 struct gb_control *control = to_gb_control(dev);
238 gb_connection_destroy(control->connection);
240 kfree(control->vendor_string);
241 kfree(control->product_string);
246 struct device_type greybus_control_type = {
247 .name = "greybus_control",
248 .release = gb_control_release,
251 struct gb_control *gb_control_create(struct gb_interface *intf)
253 struct gb_connection *connection;
254 struct gb_control *control;
256 control = kzalloc(sizeof(*control), GFP_KERNEL);
258 return ERR_PTR(-ENOMEM);
260 control->intf = intf;
262 connection = gb_connection_create_control(intf);
263 if (IS_ERR(connection)) {
265 "failed to create control connection: %ld\n",
266 PTR_ERR(connection));
268 return ERR_CAST(connection);
271 control->connection = connection;
273 control->dev.parent = &intf->dev;
274 control->dev.bus = &greybus_bus_type;
275 control->dev.type = &greybus_control_type;
276 control->dev.groups = control_groups;
277 control->dev.dma_mask = intf->dev.dma_mask;
278 device_initialize(&control->dev);
279 dev_set_name(&control->dev, "%s.ctrl", dev_name(&intf->dev));
281 gb_connection_set_data(control->connection, control);
286 int gb_control_enable(struct gb_control *control)
290 dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
292 ret = gb_connection_enable_tx(control->connection);
294 dev_err(&control->connection->intf->dev,
295 "failed to enable control connection: %d\n",
300 ret = gb_control_get_version(control);
302 goto err_disable_connection;
304 if (control->protocol_major > 0 || control->protocol_minor > 1)
305 control->has_bundle_version = true;
309 err_disable_connection:
310 gb_connection_disable(control->connection);
315 void gb_control_disable(struct gb_control *control)
317 dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
319 if (control->intf->disconnected)
320 gb_connection_disable_forced(control->connection);
322 gb_connection_disable(control->connection);
325 int gb_control_add(struct gb_control *control)
329 ret = device_add(&control->dev);
331 dev_err(&control->dev,
332 "failed to register control device: %d\n",
340 void gb_control_del(struct gb_control *control)
342 if (device_is_registered(&control->dev))
343 device_del(&control->dev);
346 void gb_control_put(struct gb_control *control)
348 put_device(&control->dev);