/* * SVC Greybus driver. * * Copyright 2015 Google Inc. * Copyright 2015 Linaro Ltd. * * Released under the GPLv2 only. */ #include #include #include #include "greybus.h" #define SVC_KEY_ARA_BUTTON KEY_A #define SVC_INTF_EJECT_TIMEOUT 9000 struct gb_svc_deferred_request { struct work_struct work; struct gb_operation *operation; }; static int gb_svc_queue_deferred_request(struct gb_operation *operation); static ssize_t endo_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gb_svc *svc = to_gb_svc(dev); return sprintf(buf, "0x%04x\n", svc->endo_id); } static DEVICE_ATTR_RO(endo_id); static ssize_t ap_intf_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gb_svc *svc = to_gb_svc(dev); return sprintf(buf, "%u\n", svc->ap_intf_id); } static DEVICE_ATTR_RO(ap_intf_id); // FIXME // This is a hack, we need to do this "right" and clean the interface up // properly, not just forcibly yank the thing out of the system and hope for the // best. But for now, people want their modules to come out without having to // throw the thing to the ground or get out a screwdriver. static ssize_t intf_eject_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct gb_svc *svc = to_gb_svc(dev); unsigned short intf_id; int ret; ret = kstrtou16(buf, 10, &intf_id); if (ret < 0) return ret; dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id); ret = gb_svc_intf_eject(svc, intf_id); if (ret < 0) return ret; return len; } static DEVICE_ATTR_WO(intf_eject); static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gb_svc *svc = to_gb_svc(dev); return sprintf(buf, "%s\n", gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled"); } static ssize_t watchdog_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct gb_svc *svc = to_gb_svc(dev); int retval; bool user_request; retval = strtobool(buf, &user_request); if (retval) return retval; if (user_request) retval = gb_svc_watchdog_enable(svc); else retval = gb_svc_watchdog_disable(svc); if (retval) return retval; return len; } static DEVICE_ATTR_RW(watchdog); static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value) { struct gb_svc_pwrmon_rail_count_get_response response; int ret; ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0, &response, sizeof(response)); if (ret) { dev_err(&svc->dev, "failed to get rail count: %d\n", ret); return ret; } *value = response.rail_count; return 0; } static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc, struct gb_svc_pwrmon_rail_names_get_response *response, size_t bufsize) { int ret; ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0, response, bufsize); if (ret) { dev_err(&svc->dev, "failed to get rail names: %d\n", ret); return ret; } return 0; } static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id, u8 measurement_type, u32 *value) { struct gb_svc_pwrmon_sample_get_request request; struct gb_svc_pwrmon_sample_get_response response; int ret; request.rail_id = rail_id; request.measurement_type = measurement_type; ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET, &request, sizeof(request), &response, sizeof(response)); if (ret) { dev_err(&svc->dev, "failed to get rail sample: %d\n", ret); return ret; } if (response.result) { dev_err(&svc->dev, "UniPro error while getting rail power sample (%d %d): %d\n", rail_id, measurement_type, response.result); switch (response.result) { case GB_SVC_PWRMON_GET_SAMPLE_INVAL: return -EINVAL; case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP: return -ENOMSG; default: return -EIO; } } *value = le32_to_cpu(response.measurement); return 0; } int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id, u8 measurement_type, u32 *value) { struct gb_svc_pwrmon_intf_sample_get_request request; struct gb_svc_pwrmon_intf_sample_get_response response; int ret; request.intf_id = intf_id; request.measurement_type = measurement_type; ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET, &request, sizeof(request), &response, sizeof(response)); if (ret) { dev_err(&svc->dev, "failed to get intf sample: %d\n", ret); return ret; } if (response.result) { dev_err(&svc->dev, "UniPro error while getting intf power sample (%d %d): %d\n", intf_id, measurement_type, response.result); switch (response.result) { case GB_SVC_PWRMON_GET_SAMPLE_INVAL: return -EINVAL; case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP: return -ENOSYS; default: return -EIO; } } *value = le32_to_cpu(response.measurement); return 0; } static struct attribute *svc_attrs[] = { &dev_attr_endo_id.attr, &dev_attr_ap_intf_id.attr, &dev_attr_intf_eject.attr, &dev_attr_watchdog.attr, NULL, }; ATTRIBUTE_GROUPS(svc); int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) { struct gb_svc_intf_device_id_request request; request.intf_id = intf_id; request.device_id = device_id; return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, &request, sizeof(request), NULL, 0); } int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id) { struct gb_svc_intf_eject_request request; int ret; request.intf_id = intf_id; /* * The pulse width for module release in svc is long so we need to * increase the timeout so the operation will not return to soon. */ ret = gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_INTF_EJECT, &request, sizeof(request), NULL, 0, SVC_INTF_EJECT_TIMEOUT); if (ret) { dev_err(&svc->dev, "failed to eject interface %u\n", intf_id); return ret; } return 0; } int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable) { /* FIXME: implement */ return 0; } int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable) { /* FIXME: implement */ return 0; } int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable) { /* FIXME: implement */ return 0; } int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type) { /* FIXME: implement */ *intf_type = GB_SVC_INTF_TYPE_GREYBUS; return 0; } int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, u32 *value) { struct gb_svc_dme_peer_get_request request; struct gb_svc_dme_peer_get_response response; u16 result; int ret; request.intf_id = intf_id; request.attr = cpu_to_le16(attr); request.selector = cpu_to_le16(selector); ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET, &request, sizeof(request), &response, sizeof(response)); if (ret) { dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n", intf_id, attr, selector, ret); return ret; } result = le16_to_cpu(response.result_code); if (result) { dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n", intf_id, attr, selector, result); return -EIO; } if (value) *value = le32_to_cpu(response.attr_value); return 0; } EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get); int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, u32 value) { struct gb_svc_dme_peer_set_request request; struct gb_svc_dme_peer_set_response response; u16 result; int ret; request.intf_id = intf_id; request.attr = cpu_to_le16(attr); request.selector = cpu_to_le16(selector); request.value = cpu_to_le32(value); ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET, &request, sizeof(request), &response, sizeof(response)); if (ret) { dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n", intf_id, attr, selector, value, ret); return ret; } result = le16_to_cpu(response.result_code); if (result) { dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n", intf_id, attr, selector, value, result); return -EIO; } return 0; } EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set); int gb_svc_connection_create(struct gb_svc *svc, u8 intf1_id, u16 cport1_id, u8 intf2_id, u16 cport2_id, u8 cport_flags) { struct gb_svc_conn_create_request request; request.intf1_id = intf1_id; request.cport1_id = cpu_to_le16(cport1_id); request.intf2_id = intf2_id; request.cport2_id = cpu_to_le16(cport2_id); request.tc = 0; /* TC0 */ request.flags = cport_flags; return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, &request, sizeof(request), NULL, 0); } EXPORT_SYMBOL_GPL(gb_svc_connection_create); void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id, u8 intf2_id, u16 cport2_id) { struct gb_svc_conn_destroy_request request; struct gb_connection *connection = svc->connection; int ret; request.intf1_id = intf1_id; request.cport1_id = cpu_to_le16(cport1_id); request.intf2_id = intf2_id; request.cport2_id = cpu_to_le16(cport2_id); ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY, &request, sizeof(request), NULL, 0); if (ret) { dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n", intf1_id, cport1_id, intf2_id, cport2_id, ret); } } EXPORT_SYMBOL_GPL(gb_svc_connection_destroy); /* Creates bi-directional routes between the devices */ int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id, u8 intf2_id, u8 dev2_id) { struct gb_svc_route_create_request request; request.intf1_id = intf1_id; request.dev1_id = dev1_id; request.intf2_id = intf2_id; request.dev2_id = dev2_id; return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE, &request, sizeof(request), NULL, 0); } /* Destroys bi-directional routes between the devices */ void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id) { struct gb_svc_route_destroy_request request; int ret; request.intf1_id = intf1_id; request.intf2_id = intf2_id; ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY, &request, sizeof(request), NULL, 0); if (ret) { dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n", intf1_id, intf2_id, ret); } } int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series, u8 tx_mode, u8 tx_gear, u8 tx_nlanes, u8 rx_mode, u8 rx_gear, u8 rx_nlanes, u8 flags, u32 quirks) { struct gb_svc_intf_set_pwrm_request request; struct gb_svc_intf_set_pwrm_response response; int ret; request.intf_id = intf_id; request.hs_series = hs_series; request.tx_mode = tx_mode; request.tx_gear = tx_gear; request.tx_nlanes = tx_nlanes; request.rx_mode = rx_mode; request.rx_gear = rx_gear; request.rx_nlanes = rx_nlanes; request.flags = flags; request.quirks = cpu_to_le32(quirks); ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM, &request, sizeof(request), &response, sizeof(response)); if (ret < 0) return ret; return le16_to_cpu(response.result_code); } EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode); int gb_svc_ping(struct gb_svc *svc) { return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING, NULL, 0, NULL, 0, GB_OPERATION_TIMEOUT_DEFAULT * 2); } EXPORT_SYMBOL_GPL(gb_svc_ping); static int gb_svc_version_request(struct gb_operation *op) { struct gb_connection *connection = op->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_svc_version_request *request; struct gb_svc_version_response *response; if (op->request->payload_size < sizeof(*request)) { dev_err(&svc->dev, "short version request (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; if (request->major > GB_SVC_VERSION_MAJOR) { dev_warn(&svc->dev, "unsupported major version (%u > %u)\n", request->major, GB_SVC_VERSION_MAJOR); return -ENOTSUPP; } svc->protocol_major = request->major; svc->protocol_minor = request->minor; if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL)) return -ENOMEM; response = op->response->payload; response->major = svc->protocol_major; response->minor = svc->protocol_minor; return 0; } static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private; struct gb_svc *svc = pwrmon_rails->svc; int ret, desc; u32 value; char buff[16]; ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, GB_SVC_PWRMON_TYPE_VOL, &value); if (ret) { dev_err(&svc->dev, "failed to get voltage sample %u: %d\n", pwrmon_rails->id, ret); return ret; } desc = scnprintf(buff, sizeof(buff), "%u\n", value); return simple_read_from_buffer(buf, len, offset, buff, desc); } static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private; struct gb_svc *svc = pwrmon_rails->svc; int ret, desc; u32 value; char buff[16]; ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, GB_SVC_PWRMON_TYPE_CURR, &value); if (ret) { dev_err(&svc->dev, "failed to get current sample %u: %d\n", pwrmon_rails->id, ret); return ret; } desc = scnprintf(buff, sizeof(buff), "%u\n", value); return simple_read_from_buffer(buf, len, offset, buff, desc); } static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private; struct gb_svc *svc = pwrmon_rails->svc; int ret, desc; u32 value; char buff[16]; ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, GB_SVC_PWRMON_TYPE_PWR, &value); if (ret) { dev_err(&svc->dev, "failed to get power sample %u: %d\n", pwrmon_rails->id, ret); return ret; } desc = scnprintf(buff, sizeof(buff), "%u\n", value); return simple_read_from_buffer(buf, len, offset, buff, desc); } static const struct file_operations pwrmon_debugfs_voltage_fops = { .read = pwr_debugfs_voltage_read, }; static const struct file_operations pwrmon_debugfs_current_fops = { .read = pwr_debugfs_current_read, }; static const struct file_operations pwrmon_debugfs_power_fops = { .read = pwr_debugfs_power_read, }; static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc) { int i; size_t bufsize; struct dentry *dent; struct gb_svc_pwrmon_rail_names_get_response *rail_names; u8 rail_count; dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry); if (IS_ERR_OR_NULL(dent)) return; if (gb_svc_pwrmon_rail_count_get(svc, &rail_count)) goto err_pwrmon_debugfs; if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT) goto err_pwrmon_debugfs; bufsize = GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count; rail_names = kzalloc(bufsize, GFP_KERNEL); if (!rail_names) goto err_pwrmon_debugfs; svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails), GFP_KERNEL); if (!svc->pwrmon_rails) goto err_pwrmon_debugfs_free; if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize)) goto err_pwrmon_debugfs_free; for (i = 0; i < rail_count; i++) { struct dentry *dir; struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i]; char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE]; snprintf(fname, sizeof(fname), "%s", (char *)&rail_names->name[i]); rail->id = i; rail->svc = svc; dir = debugfs_create_dir(fname, dent); debugfs_create_file("voltage_now", S_IRUGO, dir, rail, &pwrmon_debugfs_voltage_fops); debugfs_create_file("current_now", S_IRUGO, dir, rail, &pwrmon_debugfs_current_fops); debugfs_create_file("power_now", S_IRUGO, dir, rail, &pwrmon_debugfs_power_fops); }; kfree(rail_names); return; err_pwrmon_debugfs_free: kfree(rail_names); kfree(svc->pwrmon_rails); svc->pwrmon_rails = NULL; err_pwrmon_debugfs: debugfs_remove(dent); } static void gb_svc_debugfs_init(struct gb_svc *svc) { svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev), gb_debugfs_get()); gb_svc_pwrmon_debugfs_init(svc); } static void gb_svc_debugfs_exit(struct gb_svc *svc) { debugfs_remove_recursive(svc->debugfs_dentry); kfree(svc->pwrmon_rails); svc->pwrmon_rails = NULL; } static int gb_svc_hello(struct gb_operation *op) { struct gb_connection *connection = op->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_svc_hello_request *hello_request; int ret; if (op->request->payload_size < sizeof(*hello_request)) { dev_warn(&svc->dev, "short hello request (%zu < %zu)\n", op->request->payload_size, sizeof(*hello_request)); return -EINVAL; } hello_request = op->request->payload; svc->endo_id = le16_to_cpu(hello_request->endo_id); svc->ap_intf_id = hello_request->interface_id; ret = device_add(&svc->dev); if (ret) { dev_err(&svc->dev, "failed to register svc device: %d\n", ret); return ret; } ret = input_register_device(svc->input); if (ret) { dev_err(&svc->dev, "failed to register input: %d\n", ret); device_del(&svc->dev); return ret; } ret = gb_svc_watchdog_create(svc); if (ret) { dev_err(&svc->dev, "failed to create watchdog: %d\n", ret); input_unregister_device(svc->input); device_del(&svc->dev); return ret; } gb_svc_debugfs_init(svc); return gb_svc_queue_deferred_request(op); } static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc, u8 intf_id) { struct gb_host_device *hd = svc->hd; struct gb_module *module; size_t num_interfaces; u8 module_id; list_for_each_entry(module, &hd->modules, hd_node) { module_id = module->module_id; num_interfaces = module->num_interfaces; if (intf_id >= module_id && intf_id < module_id + num_interfaces) { return module->interfaces[intf_id - module_id]; } } return NULL; } static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id) { struct gb_host_device *hd = svc->hd; struct gb_module *module; list_for_each_entry(module, &hd->modules, hd_node) { if (module->module_id == module_id) return module; } return NULL; } static void gb_svc_intf_reenable(struct gb_svc *svc, struct gb_interface *intf) { int ret; mutex_lock(&intf->mutex); /* Mark as disconnected to prevent I/O during disable. */ intf->disconnected = true; gb_interface_disable(intf); intf->disconnected = false; ret = gb_interface_enable(intf); if (ret) { dev_err(&svc->dev, "failed to enable interface %u: %d\n", intf->interface_id, ret); gb_interface_deactivate(intf); } mutex_unlock(&intf->mutex); } static void gb_svc_process_hello_deferred(struct gb_operation *operation) { struct gb_connection *connection = operation->connection; struct gb_svc *svc = gb_connection_get_data(connection); int ret; /* * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged * module. * * The code should be removed once SW-2217, Heuristic for UniPro * Power Mode Changes is resolved. */ ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id, GB_SVC_UNIPRO_HS_SERIES_A, GB_SVC_UNIPRO_SLOW_AUTO_MODE, 2, 1, GB_SVC_UNIPRO_SLOW_AUTO_MODE, 2, 1, 0, 0); if (ret) dev_warn(&svc->dev, "power mode change failed on AP to switch link: %d\n", ret); } static void gb_svc_process_intf_hotplug(struct gb_operation *operation) { struct gb_svc_intf_hotplug_request *request; struct gb_connection *connection = operation->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_host_device *hd = connection->hd; struct gb_module *module; u8 intf_id; int ret; /* The request message size has already been verified. */ request = operation->request->payload; intf_id = request->intf_id; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id); /* All modules are considered 1x2 for now */ module = gb_svc_module_lookup(svc, intf_id); if (module) { dev_info(&svc->dev, "mode switch detected on interface %u\n", intf_id); return gb_svc_intf_reenable(svc, module->interfaces[0]); } module = gb_module_create(hd, intf_id, 1); if (!module) { dev_err(&svc->dev, "failed to create module\n"); return; } ret = gb_module_add(module); if (ret) { gb_module_put(module); return; } list_add(&module->hd_node, &hd->modules); } static void gb_svc_process_intf_hot_unplug(struct gb_operation *operation) { struct gb_svc *svc = gb_connection_get_data(operation->connection); struct gb_svc_intf_hot_unplug_request *request; struct gb_module *module; u8 intf_id; /* The request message size has already been verified. */ request = operation->request->payload; intf_id = request->intf_id; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id); /* All modules are considered 1x2 for now */ module = gb_svc_module_lookup(svc, intf_id); if (!module) { dev_warn(&svc->dev, "could not find hot-unplug interface %u\n", intf_id); return; } module->disconnected = true; gb_module_del(module); list_del(&module->hd_node); gb_module_put(module); } static void gb_svc_process_module_inserted(struct gb_operation *operation) { struct gb_svc_module_inserted_request *request; struct gb_connection *connection = operation->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_host_device *hd = svc->hd; struct gb_module *module; size_t num_interfaces; u8 module_id; u16 flags; int ret; /* The request message size has already been verified. */ request = operation->request->payload; module_id = request->primary_intf_id; num_interfaces = request->intf_count; flags = le16_to_cpu(request->flags); dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n", __func__, module_id, num_interfaces, flags); if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) { dev_warn(&svc->dev, "no primary interface detected on module %u\n", module_id); } module = gb_svc_module_lookup(svc, module_id); if (module) { dev_warn(&svc->dev, "unexpected module-inserted event %u\n", module_id); return; } module = gb_module_create(hd, module_id, num_interfaces); if (!module) { dev_err(&svc->dev, "failed to create module\n"); return; } ret = gb_module_add(module); if (ret) { gb_module_put(module); return; } list_add(&module->hd_node, &hd->modules); } static void gb_svc_process_module_removed(struct gb_operation *operation) { struct gb_svc_module_removed_request *request; struct gb_connection *connection = operation->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_module *module; u8 module_id; /* The request message size has already been verified. */ request = operation->request->payload; module_id = request->primary_intf_id; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id); module = gb_svc_module_lookup(svc, module_id); if (!module) { dev_warn(&svc->dev, "unexpected module-removed event %u\n", module_id); return; } module->disconnected = true; gb_module_del(module); list_del(&module->hd_node); gb_module_put(module); } static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation) { struct gb_svc_intf_mailbox_event_request *request; struct gb_connection *connection = operation->connection; struct gb_svc *svc = gb_connection_get_data(connection); struct gb_interface *intf; u8 intf_id; u16 result_code; u32 mailbox; /* The request message size has already been verified. */ request = operation->request->payload; intf_id = request->intf_id; result_code = le16_to_cpu(request->result_code); mailbox = le32_to_cpu(request->mailbox); dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n", __func__, intf_id, result_code, mailbox); intf = gb_svc_interface_lookup(svc, intf_id); if (!intf) { dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id); return; } if (result_code) { dev_warn(&svc->dev, "mailbox event %u with UniPro error: 0x%04x\n", intf_id, result_code); goto err_disable_interface; } if (mailbox != GB_SVC_INTF_MAILBOX_GREYBUS) { dev_warn(&svc->dev, "mailbox event %u with unexected value: 0x%08x\n", intf_id, mailbox); goto err_disable_interface; } dev_info(&svc->dev, "mode switch detected on interface %u\n", intf_id); gb_svc_intf_reenable(svc, intf); return; err_disable_interface: mutex_lock(&intf->mutex); gb_interface_disable(intf); gb_interface_deactivate(intf); mutex_unlock(&intf->mutex); } static void gb_svc_process_deferred_request(struct work_struct *work) { struct gb_svc_deferred_request *dr; struct gb_operation *operation; struct gb_svc *svc; u8 type; dr = container_of(work, struct gb_svc_deferred_request, work); operation = dr->operation; svc = gb_connection_get_data(operation->connection); type = operation->request->header->type; switch (type) { case GB_SVC_TYPE_SVC_HELLO: gb_svc_process_hello_deferred(operation); break; case GB_SVC_TYPE_INTF_HOTPLUG: gb_svc_process_intf_hotplug(operation); break; case GB_SVC_TYPE_INTF_HOT_UNPLUG: gb_svc_process_intf_hot_unplug(operation); break; case GB_SVC_TYPE_MODULE_INSERTED: gb_svc_process_module_inserted(operation); break; case GB_SVC_TYPE_MODULE_REMOVED: gb_svc_process_module_removed(operation); break; case GB_SVC_TYPE_INTF_MAILBOX_EVENT: gb_svc_process_intf_mailbox_event(operation); break; default: dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type); } gb_operation_put(operation); kfree(dr); } static int gb_svc_queue_deferred_request(struct gb_operation *operation) { struct gb_svc *svc = gb_connection_get_data(operation->connection); struct gb_svc_deferred_request *dr; dr = kmalloc(sizeof(*dr), GFP_KERNEL); if (!dr) return -ENOMEM; gb_operation_get(operation); dr->operation = operation; INIT_WORK(&dr->work, gb_svc_process_deferred_request); queue_work(svc->wq, &dr->work); return 0; } /* * Bringing up a module can be time consuming, as that may require lots of * initialization on the module side. Over that, we may also need to download * the firmware first and flash that on the module. * * In order not to make other svc events wait for all this to finish, * handle most of module hotplug stuff outside of the hotplug callback, with * help of a workqueue. */ static int gb_svc_intf_hotplug_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_svc_intf_hotplug_request *request; if (op->request->payload_size < sizeof(*request)) { dev_warn(&svc->dev, "short hotplug request received (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); return gb_svc_queue_deferred_request(op); } static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_svc_intf_hot_unplug_request *request; if (op->request->payload_size < sizeof(*request)) { dev_warn(&svc->dev, "short hot unplug request received (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); return gb_svc_queue_deferred_request(op); } static int gb_svc_intf_reset_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_message *request = op->request; struct gb_svc_intf_reset_request *reset; u8 intf_id; if (request->payload_size < sizeof(*reset)) { dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n", request->payload_size, sizeof(*reset)); return -EINVAL; } reset = request->payload; intf_id = reset->intf_id; /* FIXME Reset the interface here */ return 0; } static int gb_svc_key_code_map(struct gb_svc *svc, u16 key_code, u16 *code) { switch (key_code) { case GB_KEYCODE_ARA: *code = SVC_KEY_ARA_BUTTON; break; default: dev_warn(&svc->dev, "unknown keycode received: %u\n", key_code); return -EINVAL; } return 0; } static int gb_svc_key_event_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_message *request = op->request; struct gb_svc_key_event_request *key; u16 code; u8 event; int ret; if (request->payload_size < sizeof(*key)) { dev_warn(&svc->dev, "short key request received (%zu < %zu)\n", request->payload_size, sizeof(*key)); return -EINVAL; } key = request->payload; ret = gb_svc_key_code_map(svc, le16_to_cpu(key->key_code), &code); if (ret < 0) return ret; event = key->key_event; if ((event != GB_SVC_KEY_PRESSED) && (event != GB_SVC_KEY_RELEASED)) { dev_warn(&svc->dev, "unknown key event received: %u\n", event); return -EINVAL; } input_report_key(svc->input, code, (event == GB_SVC_KEY_PRESSED)); input_sync(svc->input); return 0; } static int gb_svc_module_inserted_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_svc_module_inserted_request *request; if (op->request->payload_size < sizeof(*request)) { dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->primary_intf_id); return gb_svc_queue_deferred_request(op); } static int gb_svc_module_removed_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_svc_module_removed_request *request; if (op->request->payload_size < sizeof(*request)) { dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->primary_intf_id); return gb_svc_queue_deferred_request(op); } static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op) { struct gb_svc *svc = gb_connection_get_data(op->connection); struct gb_svc_intf_mailbox_event_request *request; if (op->request->payload_size < sizeof(*request)) { dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n", op->request->payload_size, sizeof(*request)); return -EINVAL; } request = op->request->payload; dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); return gb_svc_queue_deferred_request(op); } static int gb_svc_request_handler(struct gb_operation *op) { struct gb_connection *connection = op->connection; struct gb_svc *svc = gb_connection_get_data(connection); u8 type = op->type; int ret = 0; /* * SVC requests need to follow a specific order (at least initially) and * below code takes care of enforcing that. The expected order is: * - PROTOCOL_VERSION * - SVC_HELLO * - Any other request, but the earlier two. * * Incoming requests are guaranteed to be serialized and so we don't * need to protect 'state' for any races. */ switch (type) { case GB_SVC_TYPE_PROTOCOL_VERSION: if (svc->state != GB_SVC_STATE_RESET) ret = -EINVAL; break; case GB_SVC_TYPE_SVC_HELLO: if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION) ret = -EINVAL; break; default: if (svc->state != GB_SVC_STATE_SVC_HELLO) ret = -EINVAL; break; } if (ret) { dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n", type, svc->state); return ret; } switch (type) { case GB_SVC_TYPE_PROTOCOL_VERSION: ret = gb_svc_version_request(op); if (!ret) svc->state = GB_SVC_STATE_PROTOCOL_VERSION; return ret; case GB_SVC_TYPE_SVC_HELLO: ret = gb_svc_hello(op); if (!ret) svc->state = GB_SVC_STATE_SVC_HELLO; return ret; case GB_SVC_TYPE_INTF_HOTPLUG: return gb_svc_intf_hotplug_recv(op); case GB_SVC_TYPE_INTF_HOT_UNPLUG: return gb_svc_intf_hot_unplug_recv(op); case GB_SVC_TYPE_INTF_RESET: return gb_svc_intf_reset_recv(op); case GB_SVC_TYPE_KEY_EVENT: return gb_svc_key_event_recv(op); case GB_SVC_TYPE_MODULE_INSERTED: return gb_svc_module_inserted_recv(op); case GB_SVC_TYPE_MODULE_REMOVED: return gb_svc_module_removed_recv(op); case GB_SVC_TYPE_INTF_MAILBOX_EVENT: return gb_svc_intf_mailbox_event_recv(op); default: dev_warn(&svc->dev, "unsupported request 0x%02x\n", type); return -EINVAL; } } static struct input_dev *gb_svc_input_create(struct gb_svc *svc) { struct input_dev *input_dev; input_dev = input_allocate_device(); if (!input_dev) return ERR_PTR(-ENOMEM); input_dev->name = dev_name(&svc->dev); svc->input_phys = kasprintf(GFP_KERNEL, "greybus-%s/input0", input_dev->name); if (!svc->input_phys) goto err_free_input; input_dev->phys = svc->input_phys; input_dev->dev.parent = &svc->dev; input_set_drvdata(input_dev, svc); input_set_capability(input_dev, EV_KEY, SVC_KEY_ARA_BUTTON); return input_dev; err_free_input: input_free_device(svc->input); return ERR_PTR(-ENOMEM); } static void gb_svc_release(struct device *dev) { struct gb_svc *svc = to_gb_svc(dev); if (svc->connection) gb_connection_destroy(svc->connection); ida_destroy(&svc->device_id_map); destroy_workqueue(svc->wq); kfree(svc->input_phys); kfree(svc); } struct device_type greybus_svc_type = { .name = "greybus_svc", .release = gb_svc_release, }; struct gb_svc *gb_svc_create(struct gb_host_device *hd) { struct gb_svc *svc; svc = kzalloc(sizeof(*svc), GFP_KERNEL); if (!svc) return NULL; svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev)); if (!svc->wq) { kfree(svc); return NULL; } svc->dev.parent = &hd->dev; svc->dev.bus = &greybus_bus_type; svc->dev.type = &greybus_svc_type; svc->dev.groups = svc_groups; svc->dev.dma_mask = svc->dev.parent->dma_mask; device_initialize(&svc->dev); dev_set_name(&svc->dev, "%d-svc", hd->bus_id); ida_init(&svc->device_id_map); svc->state = GB_SVC_STATE_RESET; svc->hd = hd; svc->input = gb_svc_input_create(svc); if (IS_ERR(svc->input)) { dev_err(&svc->dev, "failed to create input device: %ld\n", PTR_ERR(svc->input)); goto err_put_device; } svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID, gb_svc_request_handler); if (IS_ERR(svc->connection)) { dev_err(&svc->dev, "failed to create connection: %ld\n", PTR_ERR(svc->connection)); goto err_free_input; } gb_connection_set_data(svc->connection, svc); return svc; err_free_input: input_free_device(svc->input); err_put_device: put_device(&svc->dev); return NULL; } int gb_svc_add(struct gb_svc *svc) { int ret; /* * The SVC protocol is currently driven by the SVC, so the SVC device * is added from the connection request handler when enough * information has been received. */ ret = gb_connection_enable(svc->connection); if (ret) return ret; return 0; } static void gb_svc_remove_modules(struct gb_svc *svc) { struct gb_host_device *hd = svc->hd; struct gb_module *module, *tmp; list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) { gb_module_del(module); list_del(&module->hd_node); gb_module_put(module); } } void gb_svc_del(struct gb_svc *svc) { gb_connection_disable(svc->connection); /* * The SVC device and input device may have been registered * from the request handler. */ if (device_is_registered(&svc->dev)) { gb_svc_debugfs_exit(svc); gb_svc_watchdog_destroy(svc); input_unregister_device(svc->input); device_del(&svc->dev); } flush_workqueue(svc->wq); gb_svc_remove_modules(svc); } void gb_svc_put(struct gb_svc *svc) { put_device(&svc->dev); }