Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/greybus/control.c b/drivers/greybus/control.c
new file mode 100644
index 0000000..359a258
--- /dev/null
+++ b/drivers/greybus/control.c
@@ -0,0 +1,584 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Greybus CPort control protocol.
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/greybus.h>
+
+/* Highest control-protocol version supported */
+#define GB_CONTROL_VERSION_MAJOR 0
+#define GB_CONTROL_VERSION_MINOR 1
+
+static int gb_control_get_version(struct gb_control *control)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_control_version_request request;
+ struct gb_control_version_response response;
+ int ret;
+
+ request.major = GB_CONTROL_VERSION_MAJOR;
+ request.minor = GB_CONTROL_VERSION_MINOR;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_VERSION,
+ &request, sizeof(request), &response,
+ sizeof(response));
+ if (ret) {
+ dev_err(&intf->dev,
+ "failed to get control-protocol version: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.major > request.major) {
+ dev_err(&intf->dev,
+ "unsupported major control-protocol version (%u > %u)\n",
+ response.major, request.major);
+ return -ENOTSUPP;
+ }
+
+ control->protocol_major = response.major;
+ control->protocol_minor = response.minor;
+
+ dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major,
+ response.minor);
+
+ return 0;
+}
+
+static int gb_control_get_bundle_version(struct gb_control *control,
+ struct gb_bundle *bundle)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_control_bundle_version_request request;
+ struct gb_control_bundle_version_response response;
+ int ret;
+
+ request.bundle_id = bundle->id;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_VERSION,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&intf->dev,
+ "failed to get bundle %u class version: %d\n",
+ bundle->id, ret);
+ return ret;
+ }
+
+ bundle->class_major = response.major;
+ bundle->class_minor = response.minor;
+
+ dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id,
+ response.major, response.minor);
+
+ return 0;
+}
+
+int gb_control_get_bundle_versions(struct gb_control *control)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_bundle *bundle;
+ int ret;
+
+ if (!control->has_bundle_version)
+ return 0;
+
+ list_for_each_entry(bundle, &intf->bundles, links) {
+ ret = gb_control_get_bundle_version(control, bundle);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Get Manifest's size from the interface */
+int gb_control_get_manifest_size_operation(struct gb_interface *intf)
+{
+ struct gb_control_get_manifest_size_response response;
+ struct gb_connection *connection = intf->control->connection;
+ int ret;
+
+ ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE,
+ NULL, 0, &response, sizeof(response));
+ if (ret) {
+ dev_err(&connection->intf->dev,
+ "failed to get manifest size: %d\n", ret);
+ return ret;
+ }
+
+ return le16_to_cpu(response.size);
+}
+
+/* Reads Manifest from the interface */
+int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
+ size_t size)
+{
+ struct gb_connection *connection = intf->control->connection;
+
+ return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST,
+ NULL, 0, manifest, size);
+}
+
+int gb_control_connected_operation(struct gb_control *control, u16 cport_id)
+{
+ struct gb_control_connected_request request;
+
+ request.cport_id = cpu_to_le16(cport_id);
+ return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED,
+ &request, sizeof(request), NULL, 0);
+}
+
+int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id)
+{
+ struct gb_control_disconnected_request request;
+
+ request.cport_id = cpu_to_le16(cport_id);
+ return gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_DISCONNECTED, &request,
+ sizeof(request), NULL, 0);
+}
+
+int gb_control_disconnecting_operation(struct gb_control *control,
+ u16 cport_id)
+{
+ struct gb_control_disconnecting_request *request;
+ struct gb_operation *operation;
+ int ret;
+
+ operation = gb_operation_create_core(control->connection,
+ GB_CONTROL_TYPE_DISCONNECTING,
+ sizeof(*request), 0, 0,
+ GFP_KERNEL);
+ if (!operation)
+ return -ENOMEM;
+
+ request = operation->request->payload;
+ request->cport_id = cpu_to_le16(cport_id);
+
+ ret = gb_operation_request_send_sync(operation);
+ if (ret) {
+ dev_err(&control->dev, "failed to send disconnecting: %d\n",
+ ret);
+ }
+
+ gb_operation_put(operation);
+
+ return ret;
+}
+
+int gb_control_mode_switch_operation(struct gb_control *control)
+{
+ struct gb_operation *operation;
+ int ret;
+
+ operation = gb_operation_create_core(control->connection,
+ GB_CONTROL_TYPE_MODE_SWITCH,
+ 0, 0,
+ GB_OPERATION_FLAG_UNIDIRECTIONAL,
+ GFP_KERNEL);
+ if (!operation)
+ return -ENOMEM;
+
+ ret = gb_operation_request_send_sync(operation);
+ if (ret)
+ dev_err(&control->dev, "failed to send mode switch: %d\n", ret);
+
+ gb_operation_put(operation);
+
+ return ret;
+}
+
+static int gb_control_bundle_pm_status_map(u8 status)
+{
+ switch (status) {
+ case GB_CONTROL_BUNDLE_PM_INVAL:
+ return -EINVAL;
+ case GB_CONTROL_BUNDLE_PM_BUSY:
+ return -EBUSY;
+ case GB_CONTROL_BUNDLE_PM_NA:
+ return -ENOMSG;
+ case GB_CONTROL_BUNDLE_PM_FAIL:
+ default:
+ return -EREMOTEIO;
+ }
+}
+
+int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_SUSPEND, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send bundle %u suspend: %d\n",
+ bundle_id, ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to suspend bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_RESUME, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send bundle %u resume: %d\n",
+ bundle_id, ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to resume bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_DEACTIVATE, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send bundle %u deactivate: %d\n", bundle_id,
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to deactivate bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ if (!control->has_bundle_activate)
+ return 0;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_ACTIVATE, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send bundle %u activate: %d\n", bundle_id,
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to activate bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+static int gb_control_interface_pm_status_map(u8 status)
+{
+ switch (status) {
+ case GB_CONTROL_INTF_PM_BUSY:
+ return -EBUSY;
+ case GB_CONTROL_INTF_PM_NA:
+ return -ENOMSG;
+ default:
+ return -EREMOTEIO;
+ }
+}
+
+int gb_control_interface_suspend_prepare(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE, NULL, 0,
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send interface suspend prepare: %d\n", ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while preparing suspend: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_interface_deactivate_prepare(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_DEACTIVATE_PREPARE, NULL,
+ 0, &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send interface deactivate prepare: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while preparing deactivate: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_interface_hibernate_abort(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_HIBERNATE_ABORT, NULL, 0,
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send interface aborting hibernate: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while aborting hibernate: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+static ssize_t vendor_string_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", control->vendor_string);
+}
+static DEVICE_ATTR_RO(vendor_string);
+
+static ssize_t product_string_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", control->product_string);
+}
+static DEVICE_ATTR_RO(product_string);
+
+static struct attribute *control_attrs[] = {
+ &dev_attr_vendor_string.attr,
+ &dev_attr_product_string.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(control);
+
+static void gb_control_release(struct device *dev)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ gb_connection_destroy(control->connection);
+
+ kfree(control->vendor_string);
+ kfree(control->product_string);
+
+ kfree(control);
+}
+
+struct device_type greybus_control_type = {
+ .name = "greybus_control",
+ .release = gb_control_release,
+};
+
+struct gb_control *gb_control_create(struct gb_interface *intf)
+{
+ struct gb_connection *connection;
+ struct gb_control *control;
+
+ control = kzalloc(sizeof(*control), GFP_KERNEL);
+ if (!control)
+ return ERR_PTR(-ENOMEM);
+
+ control->intf = intf;
+
+ connection = gb_connection_create_control(intf);
+ if (IS_ERR(connection)) {
+ dev_err(&intf->dev,
+ "failed to create control connection: %ld\n",
+ PTR_ERR(connection));
+ kfree(control);
+ return ERR_CAST(connection);
+ }
+
+ control->connection = connection;
+
+ control->dev.parent = &intf->dev;
+ control->dev.bus = &greybus_bus_type;
+ control->dev.type = &greybus_control_type;
+ control->dev.groups = control_groups;
+ control->dev.dma_mask = intf->dev.dma_mask;
+ device_initialize(&control->dev);
+ dev_set_name(&control->dev, "%s.ctrl", dev_name(&intf->dev));
+
+ gb_connection_set_data(control->connection, control);
+
+ return control;
+}
+
+int gb_control_enable(struct gb_control *control)
+{
+ int ret;
+
+ dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
+
+ ret = gb_connection_enable_tx(control->connection);
+ if (ret) {
+ dev_err(&control->connection->intf->dev,
+ "failed to enable control connection: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = gb_control_get_version(control);
+ if (ret)
+ goto err_disable_connection;
+
+ if (control->protocol_major > 0 || control->protocol_minor > 1)
+ control->has_bundle_version = true;
+
+ /* FIXME: use protocol version instead */
+ if (!(control->intf->quirks & GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE))
+ control->has_bundle_activate = true;
+
+ return 0;
+
+err_disable_connection:
+ gb_connection_disable(control->connection);
+
+ return ret;
+}
+
+void gb_control_disable(struct gb_control *control)
+{
+ dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
+
+ if (control->intf->disconnected)
+ gb_connection_disable_forced(control->connection);
+ else
+ gb_connection_disable(control->connection);
+}
+
+int gb_control_suspend(struct gb_control *control)
+{
+ gb_connection_disable(control->connection);
+
+ return 0;
+}
+
+int gb_control_resume(struct gb_control *control)
+{
+ int ret;
+
+ ret = gb_connection_enable_tx(control->connection);
+ if (ret) {
+ dev_err(&control->connection->intf->dev,
+ "failed to enable control connection: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+int gb_control_add(struct gb_control *control)
+{
+ int ret;
+
+ ret = device_add(&control->dev);
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to register control device: %d\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+void gb_control_del(struct gb_control *control)
+{
+ if (device_is_registered(&control->dev))
+ device_del(&control->dev);
+}
+
+struct gb_control *gb_control_get(struct gb_control *control)
+{
+ get_device(&control->dev);
+
+ return control;
+}
+
+void gb_control_put(struct gb_control *control)
+{
+ put_device(&control->dev);
+}
+
+void gb_control_mode_switch_prepare(struct gb_control *control)
+{
+ gb_connection_mode_switch_prepare(control->connection);
+}
+
+void gb_control_mode_switch_complete(struct gb_control *control)
+{
+ gb_connection_mode_switch_complete(control->connection);
+}