From patchwork Wed Dec 16 16:34:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daisuke Nojiri X-Patchwork-Id: 345255 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 505DEC4361B for ; Wed, 16 Dec 2020 16:42:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11B01233EA for ; Wed, 16 Dec 2020 16:42:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726671AbgLPQmJ (ORCPT ); Wed, 16 Dec 2020 11:42:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726588AbgLPQmJ (ORCPT ); Wed, 16 Dec 2020 11:42:09 -0500 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE387C0617A6 for ; Wed, 16 Dec 2020 08:41:28 -0800 (PST) Received: by mail-pg1-x536.google.com with SMTP id k65so7702831pgk.0 for ; Wed, 16 Dec 2020 08:41:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LCnunUiMGVZeJRhX2koR/TTHdp5OuMrXcBOZcWa1cic=; b=n4FI3Bm++2AuUtj2XSu0bK+Bjwk9fFkhbsck6q7W9WqHg3he4AqUQ4g/9EwMvW2h2T XwhK9UKkL3E2vcf6Z6emMh/cbxIQYeBwzlvrxGElqW0gtXHyl7Urxr60+ubIfup5qarY Ioy3GJqgtgeMc4ojm+s8Nez5g3hNnFOW+RN1o= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LCnunUiMGVZeJRhX2koR/TTHdp5OuMrXcBOZcWa1cic=; b=LKh1ARdKCJLxq7GL7MHBC+Q8vbBwzNB87LefCPVAeOmXlsylfdgwQ5n60DuV/jKGNM 4c1r6S6fZjT/07iHe9+YwztTgc2u9DF+6gl9CznQrBBgqwyjo27ybkQNbGZ2XnJiTH4K B+0A8RUCqrQxLKAqobOaY1cvL/D3pMcZx1yqL10+tTYEn7S0fqXnqEuZWMNo5lPY8QQh JGYiao+Jcbl3nsEyXlEDSB2+glc7quOERqTshBoJuMzobPr9hZkfaiaHkCJ9a4Ar0j6O UOwoDelj/Tu/BvluHmA0etS42HLVQXDU9tdbcabW6V6tyvpaMqgv2LT3YcLH3DraDINR Sn5A== X-Gm-Message-State: AOAM532xQDDclUpTfO1vXbUpnkM1jB8AiDoZ/mlOD9CUrPaOCHeWBWze n8wFV2pYrCS4/hapjexLATWy0Q== X-Google-Smtp-Source: ABdhPJxNchSg840dzeTvy6HjP80892gfYyWz+9LwNTimDJJt4DJ7WE2G+yclDMSZRADX+S/BKeUm0w== X-Received: by 2002:a62:1ad3:0:b029:19d:cc02:5d07 with SMTP id a202-20020a621ad30000b029019dcc025d07mr32772040pfa.70.1608136888319; Wed, 16 Dec 2020 08:41:28 -0800 (PST) Received: from pc98bx3.roam.corp.google.com (c-73-222-23-249.hsd1.ca.comcast.net. [73.222.23.249]) by smtp.gmail.com with ESMTPSA id nk11sm2533723pjb.26.2020.12.16.08.41.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Dec 2020 08:41:27 -0800 (PST) From: Daisuke Nojiri Cc: vpalatin@chromium.org, Daisuke Nojiri , Lee Jones , Benson Leung , Enric Balletbo i Serra , Guenter Roeck , Sebastian Reichel , Prashant Malani , Mark Brown , Pi-Hsun Shih , Alex Levin , Gwendal Grignou , "Gustavo A. R. Silva" , Vijay Hiremath , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 1/2] power: supply: PCHG: Peripheral device charger Date: Wed, 16 Dec 2020 08:34:15 -0800 Message-Id: <20201216163416.2969209-1-dnojiri@chromium.org> X-Mailer: git-send-email 2.29.2.684.gfbc64c5ab5-goog MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch adds a driver for PCHG (Peripheral CHarGer). PCHG is a framework managing power supplies for peripheral devices. This driver creates a sysfs node for each peripheral charge port: /sys/class/power_supply/PCHGn where is the index of a charge port. For example, when a stylus is connected to a NFC/WLC port, the node prints: /sys/class/power_supply/PCHG0/ capacity=50 status=Charging type=Wireless Signed-off-by: Daisuke Nojiri --- v1 -> v2 * Separate mfd/cros_ec_dev.c * Make CONFIG_CHARGER_CROS_PCHG default to CONFIG_MFD_CROS_EC_DEV --- drivers/power/supply/Kconfig | 10 + drivers/power/supply/Makefile | 1 + .../power/supply/cros_peripheral_charger.c | 346 ++++++++++++++++++ .../linux/platform_data/cros_ec_commands.h | 48 +++ 4 files changed, 405 insertions(+) create mode 100644 drivers/power/supply/cros_peripheral_charger.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index eec646c568b7be..407f9fbbc2bb50 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -714,6 +714,16 @@ config CHARGER_CROS_USBPD what is connected to USB PD ports from the EC and converts that into power_supply properties. +config CHARGER_CROS_PCHG + tristate "ChromeOS EC based peripheral charger" + depends on MFD_CROS_EC_DEV + default MFD_CROS_EC_DEV + help + Say Y here to enable ChromeOS EC based peripheral charge driver. + This driver gets various information about the devices connected to + the peripheral charge ports from the EC and converts that into + power_supply properties. + config CHARGER_SC2731 tristate "Spreadtrum SC2731 charger driver" depends on MFD_SC27XX_PMIC || COMPILE_TEST diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index dd4b86318cd9bd..5263472a64809b 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o +obj-$(CONFIG_CHARGER_CROS_PCHG) += cros_peripheral_charger.o obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o obj-$(CONFIG_CHARGER_UCS1002) += ucs1002_power.o diff --git a/drivers/power/supply/cros_peripheral_charger.c b/drivers/power/supply/cros_peripheral_charger.c new file mode 100644 index 00000000000000..db68d3b7c80f32 --- /dev/null +++ b/drivers/power/supply/cros_peripheral_charger.c @@ -0,0 +1,346 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Power supply driver for ChromeOS EC based Peripheral Device Charger. + * + * Copyright 2020 Google LLC. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "cros-ec-pchg" +#define PCHG_DIR_NAME "PCHG%d" +#define PCHG_DIR_NAME_LENGTH sizeof("PCHG" __stringify(EC_PCHG_MAX_PORTS)) +#define PCHG_CACHE_UPDATE_DELAY msecs_to_jiffies(500) + +struct port_data { + int port_number; + char name[PCHG_DIR_NAME_LENGTH]; + struct power_supply *psy; + struct power_supply_desc psy_desc; + int psy_status; + int battery_percentage; + struct charger_data *charger; + unsigned long last_update; +}; + +struct charger_data { + struct device *dev; + struct cros_ec_dev *ec_dev; + struct cros_ec_device *ec_device; + int num_registered_psy; + struct port_data *ports[EC_PCHG_MAX_PORTS]; + struct notifier_block notifier; +}; + +static enum power_supply_property cros_pchg_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CAPACITY, + /* + * todo: Add the following. + * + * POWER_SUPPLY_PROP_TECHNOLOGY, + * POWER_SUPPLY_PROP_ERROR, + * POWER_SUPPLY_PROP_SERIAL_NUMBER, + * + * POWER_SUPPLY_PROP_ONLINE can't be used because it indicates the + * system is powered by AC. + */ +}; + +static int cros_pchg_ec_command(const struct charger_data *charger, + unsigned int version, + unsigned int command, + const void *outdata, + unsigned int outsize, + void *indata, + unsigned int insize) +{ + struct cros_ec_dev *ec_dev = charger->ec_dev; + struct cros_ec_command *msg; + int ret; + + msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = version; + msg->command = ec_dev->cmd_offset + command; + msg->outsize = outsize; + msg->insize = insize; + + if (outsize) + memcpy(msg->data, outdata, outsize); + + ret = cros_ec_cmd_xfer_status(charger->ec_device, msg); + if (ret >= 0 && insize) + memcpy(indata, msg->data, insize); + + kfree(msg); + return ret; +} + +static int cros_pchg_port_count(const struct charger_data *charger) +{ + struct ec_response_pchg_count rsp; + int ret; + + ret = cros_pchg_ec_command(charger, 0, EC_CMD_PCHG_COUNT, + NULL, 0, &rsp, sizeof(rsp)); + if (ret < 0) { + dev_warn(charger->dev, + "Unable to get number or ports (err:%d)\n", ret); + return ret; + } + + return rsp.port_count; +} + +static int cros_pchg_get_status(struct port_data *port) +{ + struct charger_data *charger = port->charger; + struct ec_params_pchg req; + struct ec_response_pchg rsp; + struct device *dev = charger->dev; + int ret; + + req.port = port->port_number; + ret = cros_pchg_ec_command(charger, 0, EC_CMD_PCHG, + &req, sizeof(req), &rsp, sizeof(rsp)); + if (ret < 0) { + dev_err(dev, "Unable to get port.%d status (err:%d)\n", + port->port_number, ret); + return ret; + } + + switch (rsp.state) { + case PCHG_STATE_RESET: + case PCHG_STATE_INITIALIZED: + case PCHG_STATE_ENABLED: + default: + port->psy_status = POWER_SUPPLY_STATUS_UNKNOWN; + port->battery_percentage = 0; + break; + case PCHG_STATE_DETECTED: + port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + port->battery_percentage = rsp.battery_percentage; + break; + case PCHG_STATE_CHARGING: + port->psy_status = POWER_SUPPLY_STATUS_CHARGING; + port->battery_percentage = rsp.battery_percentage; + break; + } + + dev_dbg(dev, + "Port %d: state=%d battery=%d%%\n", + port->port_number, rsp.state, rsp.battery_percentage); + + return 0; +} + +static int cros_pchg_get_port_status(struct port_data *port, bool ratelimit) +{ + int ret; + + if (ratelimit && + time_is_after_jiffies(port->last_update + PCHG_CACHE_UPDATE_DELAY)) + return 0; + + ret = cros_pchg_get_status(port); + if (ret < 0) + return ret; + + port->last_update = jiffies; + + return ret; +} + +static int cros_pchg_get_prop(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct port_data *port = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + case POWER_SUPPLY_PROP_CAPACITY: + cros_pchg_get_port_status(port, true); + break; + default: + break; + } + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = port->psy_status; + break; + case POWER_SUPPLY_PROP_CAPACITY: + val->intval = port->battery_percentage; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int cros_pchg_event(const struct charger_data *charger, + unsigned long host_event) +{ + int i; + + for (i = 0; i < charger->num_registered_psy; i++) + cros_pchg_get_port_status(charger->ports[i], false); + + return NOTIFY_OK; +} + +static u32 cros_get_device_event(const struct charger_data *charger) +{ + struct ec_params_device_event req; + struct ec_response_device_event rsp; + struct device *dev = charger->dev; + int ret; + + req.param = EC_DEVICE_EVENT_PARAM_GET_CURRENT_EVENTS; + ret = cros_pchg_ec_command(charger, 0, EC_CMD_DEVICE_EVENT, + &req, sizeof(req), &rsp, sizeof(rsp)); + if (ret < 0) { + dev_warn(dev, "Unable to get device events (err:%d)\n", ret); + return 0; + } + + return rsp.event_mask; +} + +static int cros_ec_notify(struct notifier_block *nb, + unsigned long queued_during_suspend, + void *data) +{ + struct cros_ec_device *ec_dev = (struct cros_ec_device *)data; + u32 host_event = cros_ec_get_host_event(ec_dev); + struct charger_data *charger = + container_of(nb, struct charger_data, notifier); + u32 device_event_mask; + + if (!host_event) + return NOTIFY_BAD; + + if (!(host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_DEVICE))) + return NOTIFY_DONE; + + /* + * todo: Retrieve device event mask in common place + * (e.g. cros_ec_proto.c). + */ + device_event_mask = cros_get_device_event(charger); + if (!(device_event_mask & EC_DEVICE_EVENT_MASK(EC_DEVICE_EVENT_WLC))) + return NOTIFY_DONE; + + return cros_pchg_event(charger, host_event); +} + +static int cros_pchg_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); + struct cros_ec_device *ec_device = ec_dev->ec_dev; + struct power_supply_desc *psy_desc; + struct charger_data *charger; + struct power_supply *psy; + struct port_data *port; + struct notifier_block *nb; + int num_ports; + int ret; + int i; + + charger = devm_kzalloc(dev, sizeof(*charger), GFP_KERNEL); + if (!charger) + return -ENOMEM; + + charger->dev = dev; + charger->ec_dev = ec_dev; + charger->ec_device = ec_device; + + ret = cros_pchg_port_count(charger); + if (ret <= 0) { + /* + * This feature is enabled by the EC and the kernel driver is + * included by default for CrOS devices. Don't need to be loud + * since this error can be normal. + */ + dev_info(dev, "No peripheral charge ports (err:%d)\n", ret); + return -ENODEV; + } + + num_ports = ret; + if (num_ports > EC_PCHG_MAX_PORTS) { + dev_err(dev, "Too many peripheral charge ports (%d)\n", + num_ports); + return -ENOBUFS; + } + + dev_info(dev, "%d peripheral charge ports found\n", num_ports); + + for (i = 0; i < num_ports; i++) { + struct power_supply_config psy_cfg = {}; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->charger = charger; + port->port_number = i; + snprintf(port->name, sizeof(port->name), PCHG_DIR_NAME, i); + + psy_desc = &port->psy_desc; + psy_desc->name = port->name; + psy_desc->type = POWER_SUPPLY_TYPE_WIRELESS; + psy_desc->get_property = cros_pchg_get_prop; + psy_desc->external_power_changed = NULL; + psy_desc->properties = cros_pchg_props; + psy_desc->num_properties = ARRAY_SIZE(cros_pchg_props); + psy_cfg.drv_data = port; + + psy = devm_power_supply_register_no_ws(dev, psy_desc, &psy_cfg); + if (IS_ERR(psy)) { + dev_err(dev, "Failed to register power supply\n"); + continue; + } + port->psy = psy; + + charger->ports[charger->num_registered_psy++] = port; + } + + if (!charger->num_registered_psy) + return -ENODEV; + + nb = &charger->notifier; + nb->notifier_call = cros_ec_notify; + ret = blocking_notifier_chain_register(&ec_dev->ec_dev->event_notifier, + nb); + if (ret < 0) + dev_err(dev, "Failed to register notifier (err:%d)\n", ret); + + return 0; +} + +static struct platform_driver cros_pchg_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = cros_pchg_probe +}; + +module_platform_driver(cros_pchg_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ChromeOS EC peripheral device charger"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 58495127dfa656..c0f0a032c8beb6 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4225,6 +4225,7 @@ enum ec_device_event { EC_DEVICE_EVENT_TRACKPAD, EC_DEVICE_EVENT_DSP, EC_DEVICE_EVENT_WIFI, + EC_DEVICE_EVENT_WLC, }; enum ec_device_event_param { @@ -5456,6 +5457,53 @@ struct ec_response_rollback_info { /* Issue AP reset */ #define EC_CMD_AP_RESET 0x0125 +/** + * Get the number of peripheral charge ports + */ +#define EC_CMD_PCHG_COUNT 0x0134 + +#define EC_PCHG_MAX_PORTS 8 + +struct ec_response_pchg_count { + uint8_t port_count; +} __ec_align1; + +/** + * Get the status of a peripheral charge port + */ +#define EC_CMD_PCHG 0x0135 + +struct ec_params_pchg { + uint8_t port; +} __ec_align1; + +struct ec_response_pchg { + uint32_t error; /* enum pchg_error */ + uint8_t state; /* enum pchg_state state */ + uint8_t battery_percentage; +} __ec_align2; + +enum pchg_state { + /* Charger is reset and not initialized. */ + PCHG_STATE_RESET = 0, + /* Charger is initialized or disabled. */ + PCHG_STATE_INITIALIZED, + /* Charger is enabled and ready to detect a device. */ + PCHG_STATE_ENABLED, + /* Device is detected in proximity. */ + PCHG_STATE_DETECTED, + /* Device is being charged. */ + PCHG_STATE_CHARGING, +}; + +#define EC_PCHG_STATE_TEXT { \ + [PCHG_STATE_RESET] = "RESET", \ + [PCHG_STATE_INITIALIZED] = "INITIALIZED", \ + [PCHG_STATE_ENABLED] = "ENABLED", \ + [PCHG_STATE_DETECTED] = "DETECTED", \ + [PCHG_STATE_CHARGING] = "CHARGING", \ + } + /*****************************************************************************/ /* Locate peripheral chips * From patchwork Wed Dec 16 16:34:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daisuke Nojiri X-Patchwork-Id: 344730 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9655FC2BBCA for ; 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[73.222.23.249]) by smtp.gmail.com with ESMTPSA id nk11sm2533723pjb.26.2020.12.16.08.42.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Dec 2020 08:42:30 -0800 (PST) From: Daisuke Nojiri Cc: vpalatin@chromium.org, Daisuke Nojiri , Lee Jones , Benson Leung , Enric Balletbo i Serra , Guenter Roeck , Sebastian Reichel , Prashant Malani , Gwendal Grignou , Pi-Hsun Shih , Mark Brown , "Gustavo A. R. Silva" , Yu-Hsuan Hsu , Vijay Hiremath , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 2/2] mfd: cros_ec: Add peripheral device charger Date: Wed, 16 Dec 2020 08:34:17 -0800 Message-Id: <20201216163416.2969209-2-dnojiri@chromium.org> X-Mailer: git-send-email 2.29.2.684.gfbc64c5ab5-goog In-Reply-To: <20201216163416.2969209-1-dnojiri@chromium.org> References: <20201216163416.2969209-1-dnojiri@chromium.org> MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch adds a cell entry for PCHG (Peripheral CHarGer). PCHG is a framework managing power supplies for peripheral devices. Signed-off-by: Daisuke Nojiri Acked-for-MFD-by: Lee Jones --- drivers/mfd/cros_ec_dev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 6135321592b76c..f3bc1cb6891ba5 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -116,6 +116,7 @@ static const struct mfd_cell cros_ec_platform_cells[] = { { .name = "cros-ec-pd-sysfs" }, { .name = "cros-ec-sysfs", }, { .name = "cros-ec-pd-update", }, + { .name = "cros-ec-pchg", }, }; static const struct mfd_cell cros_ec_vbc_cells[] = {