360 lines
8.9 KiB
C
360 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* CEC driver for ChromeOS Embedded Controller
|
|
*
|
|
* Copyright (c) 2018 BayLibre, SAS
|
|
* Author: Neil Armstrong <narmstrong@baylibre.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/cec.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_data/cros_ec_commands.h>
|
|
#include <linux/platform_data/cros_ec_proto.h>
|
|
#include <media/cec.h>
|
|
#include <media/cec-notifier.h>
|
|
|
|
#define DRV_NAME "cros-ec-cec"
|
|
|
|
/**
|
|
* struct cros_ec_cec - Driver data for EC CEC
|
|
*
|
|
* @cros_ec: Pointer to EC device
|
|
* @notifier: Notifier info for responding to EC events
|
|
* @adap: CEC adapter
|
|
* @notify: CEC notifier pointer
|
|
* @rx_msg: storage for a received message
|
|
*/
|
|
struct cros_ec_cec {
|
|
struct cros_ec_device *cros_ec;
|
|
struct notifier_block notifier;
|
|
struct cec_adapter *adap;
|
|
struct cec_notifier *notify;
|
|
struct cec_msg rx_msg;
|
|
};
|
|
|
|
static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
|
|
{
|
|
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
|
|
uint8_t *cec_message = cros_ec->event_data.data.cec_message;
|
|
unsigned int len = cros_ec->event_size;
|
|
|
|
cros_ec_cec->rx_msg.len = len;
|
|
memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);
|
|
|
|
cec_received_msg(cros_ec_cec->adap, &cros_ec_cec->rx_msg);
|
|
}
|
|
|
|
static void handle_cec_event(struct cros_ec_cec *cros_ec_cec)
|
|
{
|
|
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
|
|
uint32_t events = cros_ec->event_data.data.cec_events;
|
|
|
|
if (events & EC_MKBP_CEC_SEND_OK)
|
|
cec_transmit_attempt_done(cros_ec_cec->adap,
|
|
CEC_TX_STATUS_OK);
|
|
|
|
/* FW takes care of all retries, tell core to avoid more retries */
|
|
if (events & EC_MKBP_CEC_SEND_FAILED)
|
|
cec_transmit_attempt_done(cros_ec_cec->adap,
|
|
CEC_TX_STATUS_MAX_RETRIES |
|
|
CEC_TX_STATUS_NACK);
|
|
}
|
|
|
|
static int cros_ec_cec_event(struct notifier_block *nb,
|
|
unsigned long queued_during_suspend,
|
|
void *_notify)
|
|
{
|
|
struct cros_ec_cec *cros_ec_cec;
|
|
struct cros_ec_device *cros_ec;
|
|
|
|
cros_ec_cec = container_of(nb, struct cros_ec_cec, notifier);
|
|
cros_ec = cros_ec_cec->cros_ec;
|
|
|
|
if (cros_ec->event_data.event_type == EC_MKBP_EVENT_CEC_EVENT) {
|
|
handle_cec_event(cros_ec_cec);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
if (cros_ec->event_data.event_type == EC_MKBP_EVENT_CEC_MESSAGE) {
|
|
handle_cec_message(cros_ec_cec);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int cros_ec_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
|
|
{
|
|
struct cros_ec_cec *cros_ec_cec = adap->priv;
|
|
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
|
|
struct {
|
|
struct cros_ec_command msg;
|
|
struct ec_params_cec_set data;
|
|
} __packed msg = {};
|
|
int ret;
|
|
|
|
msg.msg.command = EC_CMD_CEC_SET;
|
|
msg.msg.outsize = sizeof(msg.data);
|
|
msg.data.cmd = CEC_CMD_LOGICAL_ADDRESS;
|
|
msg.data.val = logical_addr;
|
|
|
|
ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
|
|
if (ret < 0) {
|
|
dev_err(cros_ec->dev,
|
|
"error setting CEC logical address on EC: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cros_ec_cec_transmit(struct cec_adapter *adap, u8 attempts,
|
|
u32 signal_free_time, struct cec_msg *cec_msg)
|
|
{
|
|
struct cros_ec_cec *cros_ec_cec = adap->priv;
|
|
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
|
|
struct {
|
|
struct cros_ec_command msg;
|
|
struct ec_params_cec_write data;
|
|
} __packed msg = {};
|
|
int ret;
|
|
|
|
msg.msg.command = EC_CMD_CEC_WRITE_MSG;
|
|
msg.msg.outsize = cec_msg->len;
|
|
memcpy(msg.data.msg, cec_msg->msg, cec_msg->len);
|
|
|
|
ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
|
|
if (ret < 0) {
|
|
dev_err(cros_ec->dev,
|
|
"error writing CEC msg on EC: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cros_ec_cec_adap_enable(struct cec_adapter *adap, bool enable)
|
|
{
|
|
struct cros_ec_cec *cros_ec_cec = adap->priv;
|
|
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
|
|
struct {
|
|
struct cros_ec_command msg;
|
|
struct ec_params_cec_set data;
|
|
} __packed msg = {};
|
|
int ret;
|
|
|
|
msg.msg.command = EC_CMD_CEC_SET;
|
|
msg.msg.outsize = sizeof(msg.data);
|
|
msg.data.cmd = CEC_CMD_ENABLE;
|
|
msg.data.val = enable;
|
|
|
|
ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
|
|
if (ret < 0) {
|
|
dev_err(cros_ec->dev,
|
|
"error %sabling CEC on EC: %d\n",
|
|
(enable ? "en" : "dis"), ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct cec_adap_ops cros_ec_cec_ops = {
|
|
.adap_enable = cros_ec_cec_adap_enable,
|
|
.adap_log_addr = cros_ec_cec_set_log_addr,
|
|
.adap_transmit = cros_ec_cec_transmit,
|
|
};
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int cros_ec_cec_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(cros_ec_cec->cros_ec->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cros_ec_cec_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(cros_ec_cec->cros_ec->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(cros_ec_cec_pm_ops,
|
|
cros_ec_cec_suspend, cros_ec_cec_resume);
|
|
|
|
#if IS_ENABLED(CONFIG_PCI) && IS_ENABLED(CONFIG_DMI)
|
|
|
|
/*
|
|
* The Firmware only handles a single CEC interface tied to a single HDMI
|
|
* connector we specify along with the DRM device name handling the HDMI output
|
|
*/
|
|
|
|
struct cec_dmi_match {
|
|
const char *sys_vendor;
|
|
const char *product_name;
|
|
const char *devname;
|
|
const char *conn;
|
|
};
|
|
|
|
static const struct cec_dmi_match cec_dmi_match_table[] = {
|
|
/* Google Fizz */
|
|
{ "Google", "Fizz", "0000:00:02.0", "Port B" },
|
|
};
|
|
|
|
static struct device *cros_ec_cec_find_hdmi_dev(struct device *dev,
|
|
const char **conn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < ARRAY_SIZE(cec_dmi_match_table) ; ++i) {
|
|
const struct cec_dmi_match *m = &cec_dmi_match_table[i];
|
|
|
|
if (dmi_match(DMI_SYS_VENDOR, m->sys_vendor) &&
|
|
dmi_match(DMI_PRODUCT_NAME, m->product_name)) {
|
|
struct device *d;
|
|
|
|
/* Find the device, bail out if not yet registered */
|
|
d = bus_find_device_by_name(&pci_bus_type, NULL,
|
|
m->devname);
|
|
if (!d)
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
put_device(d);
|
|
*conn = m->conn;
|
|
return d;
|
|
}
|
|
}
|
|
|
|
/* Hardware support must be added in the cec_dmi_match_table */
|
|
dev_warn(dev, "CEC notifier not configured for this hardware\n");
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
#else
|
|
|
|
static struct device *cros_ec_cec_find_hdmi_dev(struct device *dev,
|
|
const char **conn)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
#endif
|
|
|
|
static int cros_ec_cec_probe(struct platform_device *pdev)
|
|
{
|
|
struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
|
|
struct cros_ec_device *cros_ec = ec_dev->ec_dev;
|
|
struct cros_ec_cec *cros_ec_cec;
|
|
struct device *hdmi_dev;
|
|
const char *conn = NULL;
|
|
int ret;
|
|
|
|
hdmi_dev = cros_ec_cec_find_hdmi_dev(&pdev->dev, &conn);
|
|
if (IS_ERR(hdmi_dev))
|
|
return PTR_ERR(hdmi_dev);
|
|
|
|
cros_ec_cec = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_cec),
|
|
GFP_KERNEL);
|
|
if (!cros_ec_cec)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, cros_ec_cec);
|
|
cros_ec_cec->cros_ec = cros_ec;
|
|
|
|
ret = device_init_wakeup(&pdev->dev, 1);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to initialize wakeup\n");
|
|
return ret;
|
|
}
|
|
|
|
cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
|
|
DRV_NAME,
|
|
CEC_CAP_DEFAULTS |
|
|
CEC_CAP_CONNECTOR_INFO, 1);
|
|
if (IS_ERR(cros_ec_cec->adap))
|
|
return PTR_ERR(cros_ec_cec->adap);
|
|
|
|
cros_ec_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, conn,
|
|
cros_ec_cec->adap);
|
|
if (!cros_ec_cec->notify) {
|
|
ret = -ENOMEM;
|
|
goto out_probe_adapter;
|
|
}
|
|
|
|
/* Get CEC events from the EC. */
|
|
cros_ec_cec->notifier.notifier_call = cros_ec_cec_event;
|
|
ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
|
|
&cros_ec_cec->notifier);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register notifier\n");
|
|
goto out_probe_notify;
|
|
}
|
|
|
|
ret = cec_register_adapter(cros_ec_cec->adap, &pdev->dev);
|
|
if (ret < 0)
|
|
goto out_probe_notify;
|
|
|
|
return 0;
|
|
|
|
out_probe_notify:
|
|
cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
|
|
cros_ec_cec->adap);
|
|
out_probe_adapter:
|
|
cec_delete_adapter(cros_ec_cec->adap);
|
|
return ret;
|
|
}
|
|
|
|
static int cros_ec_cec_remove(struct platform_device *pdev)
|
|
{
|
|
struct cros_ec_cec *cros_ec_cec = platform_get_drvdata(pdev);
|
|
struct device *dev = &pdev->dev;
|
|
int ret;
|
|
|
|
ret = blocking_notifier_chain_unregister(
|
|
&cros_ec_cec->cros_ec->event_notifier,
|
|
&cros_ec_cec->notifier);
|
|
|
|
if (ret) {
|
|
dev_err(dev, "failed to unregister notifier\n");
|
|
return ret;
|
|
}
|
|
|
|
cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
|
|
cros_ec_cec->adap);
|
|
cec_unregister_adapter(cros_ec_cec->adap);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver cros_ec_cec_driver = {
|
|
.probe = cros_ec_cec_probe,
|
|
.remove = cros_ec_cec_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.pm = &cros_ec_cec_pm_ops,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(cros_ec_cec_driver);
|
|
|
|
MODULE_DESCRIPTION("CEC driver for ChromeOS ECs");
|
|
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|