diff options
Diffstat (limited to 'drivers/greybus/control.c')
| -rw-r--r-- | drivers/greybus/control.c | 584 |
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); +} |