/* * ChromeOS EC multi-function device * * Copyright (C) 2012 Google, Inc * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * The ChromeOS EC multi function device is used to mux all the requests * to the EC device for its multiple features: keyboard controller, * battery charging and regulator control, firmware update. */ #include <linux/of_platform.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/mfd/core.h> #include <linux/mfd/cros_ec.h> #define CROS_EC_DEV_EC_INDEX 0 #define CROS_EC_DEV_PD_INDEX 1 static struct cros_ec_platform ec_p = { .ec_name = CROS_EC_DEV_NAME, .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX), }; static struct cros_ec_platform pd_p = { .ec_name = CROS_EC_DEV_PD_NAME, .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX), }; static const struct mfd_cell ec_cell = { .name = "cros-ec-ctl", .platform_data = &ec_p, .pdata_size = sizeof(ec_p), }; static const struct mfd_cell ec_pd_cell = { .name = "cros-ec-ctl", .platform_data = &pd_p, .pdata_size = sizeof(pd_p), }; int cros_ec_register(struct cros_ec_device *ec_dev) { struct device *dev = ec_dev->dev; int err = 0; ec_dev->max_request = sizeof(struct ec_params_hello); ec_dev->max_response = sizeof(struct ec_response_get_protocol_info); ec_dev->max_passthru = 0; ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); if (!ec_dev->din) return -ENOMEM; ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); if (!ec_dev->dout) return -ENOMEM; mutex_init(&ec_dev->lock); cros_ec_query_all(ec_dev); err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell, 1, NULL, ec_dev->irq, NULL); if (err) { dev_err(dev, "Failed to register Embedded Controller subdevice %d\n", err); return err; } if (ec_dev->max_passthru) { /* * Register a PD device as well on top of this device. * We make the following assumptions: * - behind an EC, we have a pd * - only one device added. * - the EC is responsive at init time (it is not true for a * sensor hub. */ err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_pd_cell, 1, NULL, ec_dev->irq, NULL); if (err) { dev_err(dev, "Failed to register Power Delivery subdevice %d\n", err); return err; } } if (IS_ENABLED(CONFIG_OF) && dev->of_node) { err = of_platform_populate(dev->of_node, NULL, NULL, dev); if (err) { mfd_remove_devices(dev); dev_err(dev, "Failed to register sub-devices\n"); return err; } } dev_info(dev, "Chrome EC device registered\n"); return 0; } EXPORT_SYMBOL(cros_ec_register); int cros_ec_remove(struct cros_ec_device *ec_dev) { mfd_remove_devices(ec_dev->dev); return 0; } EXPORT_SYMBOL(cros_ec_remove); #ifdef CONFIG_PM_SLEEP int cros_ec_suspend(struct cros_ec_device *ec_dev) { struct device *dev = ec_dev->dev; if (device_may_wakeup(dev)) ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq); disable_irq(ec_dev->irq); ec_dev->was_wake_device = ec_dev->wake_enabled; return 0; } EXPORT_SYMBOL(cros_ec_suspend); int cros_ec_resume(struct cros_ec_device *ec_dev) { enable_irq(ec_dev->irq); if (ec_dev->wake_enabled) { disable_irq_wake(ec_dev->irq); ec_dev->wake_enabled = 0; } return 0; } EXPORT_SYMBOL(cros_ec_resume); #endif MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("ChromeOS EC core driver");