linux/drivers/mfd/cros_ec_dev.c
Rob Herring dc0c386e09 mfd: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174731.4059811-1-robh@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
2023-08-18 21:48:03 +01:00

351 lines
8.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cros_ec_dev - expose the Chrome OS Embedded Controller to user-space
*
* Copyright (C) 2014 Google, Inc.
*/
#include <linux/dmi.h>
#include <linux/kconfig.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/platform_data/cros_ec_chardev.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/slab.h>
#define DRV_NAME "cros-ec-dev"
static struct class cros_class = {
.name = "chromeos",
};
/**
* struct cros_feature_to_name - CrOS feature id to name/short description.
* @id: The feature identifier.
* @name: Device name associated with the feature id.
* @desc: Short name that will be displayed.
*/
struct cros_feature_to_name {
unsigned int id;
const char *name;
const char *desc;
};
/**
* struct cros_feature_to_cells - CrOS feature id to mfd cells association.
* @id: The feature identifier.
* @mfd_cells: Pointer to the array of mfd cells that needs to be added.
* @num_cells: Number of mfd cells into the array.
*/
struct cros_feature_to_cells {
unsigned int id;
const struct mfd_cell *mfd_cells;
unsigned int num_cells;
};
static const struct cros_feature_to_name cros_mcu_devices[] = {
{
.id = EC_FEATURE_FINGERPRINT,
.name = CROS_EC_DEV_FP_NAME,
.desc = "Fingerprint",
},
{
.id = EC_FEATURE_ISH,
.name = CROS_EC_DEV_ISH_NAME,
.desc = "Integrated Sensor Hub",
},
{
.id = EC_FEATURE_SCP,
.name = CROS_EC_DEV_SCP_NAME,
.desc = "System Control Processor",
},
{
.id = EC_FEATURE_TOUCHPAD,
.name = CROS_EC_DEV_TP_NAME,
.desc = "Touchpad",
},
};
static const struct mfd_cell cros_ec_cec_cells[] = {
{ .name = "cros-ec-cec", },
};
static const struct mfd_cell cros_ec_rtc_cells[] = {
{ .name = "cros-ec-rtc", },
};
static const struct mfd_cell cros_ec_sensorhub_cells[] = {
{ .name = "cros-ec-sensorhub", },
};
static const struct mfd_cell cros_usbpd_charger_cells[] = {
{ .name = "cros-usbpd-charger", },
{ .name = "cros-usbpd-logger", },
};
static const struct mfd_cell cros_usbpd_notify_cells[] = {
{ .name = "cros-usbpd-notify", },
};
static const struct cros_feature_to_cells cros_subdevices[] = {
{
.id = EC_FEATURE_CEC,
.mfd_cells = cros_ec_cec_cells,
.num_cells = ARRAY_SIZE(cros_ec_cec_cells),
},
{
.id = EC_FEATURE_RTC,
.mfd_cells = cros_ec_rtc_cells,
.num_cells = ARRAY_SIZE(cros_ec_rtc_cells),
},
{
.id = EC_FEATURE_USB_PD,
.mfd_cells = cros_usbpd_charger_cells,
.num_cells = ARRAY_SIZE(cros_usbpd_charger_cells),
},
};
static const struct mfd_cell cros_ec_platform_cells[] = {
{ .name = "cros-ec-chardev", },
{ .name = "cros-ec-debugfs", },
{ .name = "cros-ec-sysfs", },
};
static const struct mfd_cell cros_ec_pchg_cells[] = {
{ .name = "cros-ec-pchg", },
};
static const struct mfd_cell cros_ec_lightbar_cells[] = {
{ .name = "cros-ec-lightbar", }
};
static const struct mfd_cell cros_ec_vbc_cells[] = {
{ .name = "cros-ec-vbc", }
};
static void cros_ec_class_release(struct device *dev)
{
kfree(to_cros_ec_dev(dev));
}
static int ec_device_probe(struct platform_device *pdev)
{
int retval = -ENOMEM;
struct device_node *node;
struct device *dev = &pdev->dev;
struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
struct ec_response_pchg_count pchg_count;
int i;
if (!ec)
return retval;
dev_set_drvdata(dev, ec);
ec->ec_dev = dev_get_drvdata(dev->parent);
ec->dev = dev;
ec->cmd_offset = ec_platform->cmd_offset;
ec->features.flags[0] = -1U; /* Not cached yet */
ec->features.flags[1] = -1U; /* Not cached yet */
device_initialize(&ec->class_dev);
for (i = 0; i < ARRAY_SIZE(cros_mcu_devices); i++) {
/*
* Check whether this is actually a dedicated MCU rather
* than an standard EC.
*/
if (cros_ec_check_features(ec, cros_mcu_devices[i].id)) {
dev_info(dev, "CrOS %s MCU detected\n",
cros_mcu_devices[i].desc);
/*
* Help userspace differentiating ECs from other MCU,
* regardless of the probing order.
*/
ec_platform->ec_name = cros_mcu_devices[i].name;
break;
}
}
/*
* Add the class device
*/
ec->class_dev.class = &cros_class;
ec->class_dev.parent = dev;
ec->class_dev.release = cros_ec_class_release;
retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
if (retval) {
dev_err(dev, "dev_set_name failed => %d\n", retval);
goto failed;
}
retval = device_add(&ec->class_dev);
if (retval)
goto failed;
/* check whether this EC is a sensor hub. */
if (cros_ec_get_sensor_count(ec) > 0) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_ec_sensorhub_cells,
ARRAY_SIZE(cros_ec_sensorhub_cells));
if (retval)
dev_err(ec->dev, "failed to add %s subdevice: %d\n",
cros_ec_sensorhub_cells->name, retval);
}
/*
* The following subdevices can be detected by sending the
* EC_FEATURE_GET_CMD Embedded Controller device.
*/
for (i = 0; i < ARRAY_SIZE(cros_subdevices); i++) {
if (cros_ec_check_features(ec, cros_subdevices[i].id)) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_subdevices[i].mfd_cells,
cros_subdevices[i].num_cells);
if (retval)
dev_err(ec->dev,
"failed to add %s subdevice: %d\n",
cros_subdevices[i].mfd_cells->name,
retval);
}
}
/*
* Lightbar is a special case. Newer devices support autodetection,
* but older ones do not.
*/
if (cros_ec_check_features(ec, EC_FEATURE_LIGHTBAR) ||
dmi_match(DMI_PRODUCT_NAME, "Link")) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_ec_lightbar_cells,
ARRAY_SIZE(cros_ec_lightbar_cells));
if (retval)
dev_warn(ec->dev, "failed to add lightbar: %d\n",
retval);
}
/*
* The PD notifier driver cell is separate since it only needs to be
* explicitly added on platforms that don't have the PD notifier ACPI
* device entry defined.
*/
if (IS_ENABLED(CONFIG_OF) && ec->ec_dev->dev->of_node) {
if (cros_ec_check_features(ec, EC_FEATURE_USB_PD)) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_usbpd_notify_cells,
ARRAY_SIZE(cros_usbpd_notify_cells));
if (retval)
dev_err(ec->dev,
"failed to add PD notify devices: %d\n",
retval);
}
}
/*
* The PCHG device cannot be detected by sending EC_FEATURE_GET_CMD, but
* it can be detected by querying the number of peripheral chargers.
*/
retval = cros_ec_cmd(ec->ec_dev, 0, EC_CMD_PCHG_COUNT, NULL, 0,
&pchg_count, sizeof(pchg_count));
if (retval >= 0 && pchg_count.port_count) {
retval = mfd_add_hotplug_devices(ec->dev,
cros_ec_pchg_cells,
ARRAY_SIZE(cros_ec_pchg_cells));
if (retval)
dev_warn(ec->dev, "failed to add pchg: %d\n",
retval);
}
/*
* The following subdevices cannot be detected by sending the
* EC_FEATURE_GET_CMD to the Embedded Controller device.
*/
retval = mfd_add_hotplug_devices(ec->dev, cros_ec_platform_cells,
ARRAY_SIZE(cros_ec_platform_cells));
if (retval)
dev_warn(ec->dev,
"failed to add cros-ec platform devices: %d\n",
retval);
/* Check whether this EC instance has a VBC NVRAM */
node = ec->ec_dev->dev->of_node;
if (of_property_read_bool(node, "google,has-vbc-nvram")) {
retval = mfd_add_hotplug_devices(ec->dev, cros_ec_vbc_cells,
ARRAY_SIZE(cros_ec_vbc_cells));
if (retval)
dev_warn(ec->dev, "failed to add VBC devices: %d\n",
retval);
}
return 0;
failed:
put_device(&ec->class_dev);
return retval;
}
static int ec_device_remove(struct platform_device *pdev)
{
struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
mfd_remove_devices(ec->dev);
device_unregister(&ec->class_dev);
return 0;
}
static const struct platform_device_id cros_ec_id[] = {
{ DRV_NAME, 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, cros_ec_id);
static struct platform_driver cros_ec_dev_driver = {
.driver = {
.name = DRV_NAME,
},
.id_table = cros_ec_id,
.probe = ec_device_probe,
.remove = ec_device_remove,
};
static int __init cros_ec_dev_init(void)
{
int ret;
ret = class_register(&cros_class);
if (ret) {
pr_err(CROS_EC_DEV_NAME ": failed to register device class\n");
return ret;
}
/* Register the driver */
ret = platform_driver_register(&cros_ec_dev_driver);
if (ret < 0) {
pr_warn(CROS_EC_DEV_NAME ": can't register driver: %d\n", ret);
goto failed_devreg;
}
return 0;
failed_devreg:
class_unregister(&cros_class);
return ret;
}
static void __exit cros_ec_dev_exit(void)
{
platform_driver_unregister(&cros_ec_dev_driver);
class_unregister(&cros_class);
}
module_init(cros_ec_dev_init);
module_exit(cros_ec_dev_exit);
MODULE_AUTHOR("Bill Richardson <wfrichar@chromium.org>");
MODULE_DESCRIPTION("Userspace interface to the Chrome OS Embedded Controller");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");