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