280 lines
6.8 KiB
C
280 lines
6.8 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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#include <linux/suspend.h>
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#include <asm/unaligned.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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static irqreturn_t ec_irq_thread(int irq, void *data)
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{
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struct cros_ec_device *ec_dev = data;
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bool wake_event = true;
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int ret;
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ret = cros_ec_get_next_event(ec_dev, &wake_event);
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/*
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* Signal only if wake host events or any interrupt if
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* cros_ec_get_next_event() returned an error (default value for
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* wake_event is true)
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*/
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if (wake_event && device_may_wakeup(ec_dev->dev))
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pm_wakeup_event(ec_dev->dev, 0);
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if (ret > 0)
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blocking_notifier_call_chain(&ec_dev->event_notifier,
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0, ec_dev);
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return IRQ_HANDLED;
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}
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static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
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{
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struct {
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struct cros_ec_command msg;
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struct ec_params_host_sleep_event req;
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} __packed buf;
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memset(&buf, 0, sizeof(buf));
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buf.req.sleep_event = sleep_event;
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buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
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buf.msg.version = 0;
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buf.msg.outsize = sizeof(buf.req);
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return cros_ec_cmd_xfer(ec_dev, &buf.msg);
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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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BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);
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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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if (ec_dev->irq) {
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err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"chromeos-ec", ec_dev);
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if (err) {
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dev_err(dev, "Failed to request IRQ %d: %d",
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ec_dev->irq, err);
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return err;
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}
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}
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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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goto fail_mfd;
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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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goto fail_mfd;
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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 = devm_of_platform_populate(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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goto fail_mfd;
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}
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}
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/*
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* Clear sleep event - this will fail harmlessly on platforms that
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* don't implement the sleep event host command.
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*/
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err = cros_ec_sleep_event(ec_dev, 0);
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if (err < 0)
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dev_dbg(ec_dev->dev, "Error %d clearing sleep event to ec",
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err);
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dev_info(dev, "Chrome EC device registered\n");
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cros_ec_acpi_install_gpe_handler(dev);
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return 0;
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fail_mfd:
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if (ec_dev->irq)
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free_irq(ec_dev->irq, ec_dev);
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return err;
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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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cros_ec_acpi_remove_gpe_handler();
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if (ec_dev->irq)
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free_irq(ec_dev->irq, ec_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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int ret;
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u8 sleep_event;
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if (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) {
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sleep_event = HOST_SLEEP_EVENT_S3_SUSPEND;
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} else {
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sleep_event = HOST_SLEEP_EVENT_S0IX_SUSPEND;
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/* Clearing the GPE status for any pending event */
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cros_ec_acpi_clear_gpe();
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}
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ret = cros_ec_sleep_event(ec_dev, sleep_event);
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if (ret < 0)
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dev_dbg(ec_dev->dev, "Error %d sending suspend event to ec",
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ret);
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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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ec_dev->suspended = true;
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_suspend);
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static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
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{
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while (cros_ec_get_next_event(ec_dev, NULL) > 0)
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blocking_notifier_call_chain(&ec_dev->event_notifier,
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1, ec_dev);
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}
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int cros_ec_resume(struct cros_ec_device *ec_dev)
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{
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int ret;
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u8 sleep_event;
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ec_dev->suspended = false;
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enable_irq(ec_dev->irq);
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sleep_event = (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) ?
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HOST_SLEEP_EVENT_S3_RESUME :
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HOST_SLEEP_EVENT_S0IX_RESUME;
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ret = cros_ec_sleep_event(ec_dev, sleep_event);
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if (ret < 0)
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dev_dbg(ec_dev->dev, "Error %d sending resume event to ec",
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ret);
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/*
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* In some cases, we need to distinguish between events that occur
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* during suspend if the EC is not a wake source. For example,
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* keypresses during suspend should be discarded if it does not wake
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* the system.
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*
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* If the EC is not a wake source, drain the event queue and mark them
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* as "queued during suspend".
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*/
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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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} else {
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cros_ec_drain_events(ec_dev);
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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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