mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 15:00:42 +07:00
156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
|
|
* 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");
|