staging: greybus: move the greybus core to drivers/greybus

The Greybus core code has been stable for a long time, and has been
shipping for many years in millions of phones.  With the advent of a
recent Google Summer of Code project, and a number of new devices in the
works from various companies, it is time to get the core greybus code
out of staging as it really is going to be with us for a while.

Cc: Johan Hovold <johan@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: greybus-dev@lists.linaro.org
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Alex Elder <elder@kernel.org>
Link: https://lore.kernel.org/r/20190825055429.18547-9-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 584 insertions, 0 deletions

diff --git a/drivers/greybus/control.c b/drivers/greybus/control.c
new file mode 100644
index 000000000000..359a25841973
--- /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);
+}