blob: 2d95e16cd248934bfd8f27da9343f80864b7bba6 [file] [log] [blame]
// 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;
device_init_wakeup(&pdev->dev, 1);
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);