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-rw-r--r--drivers/platform/chrome/Kconfig27
-rw-r--r--drivers/platform/chrome/Makefile5
-rw-r--r--drivers/platform/chrome/chromeos_laptop.c2
-rw-r--r--drivers/platform/chrome/cros_ec.c32
-rw-r--r--drivers/platform/chrome/cros_ec_chardev.c4
-rw-r--r--drivers/platform/chrome/cros_ec_lightbar.c50
-rw-r--r--drivers/platform/chrome/cros_ec_proto.c9
-rw-r--r--drivers/platform/chrome/cros_ec_rpmsg.c16
-rw-r--r--drivers/platform/chrome/cros_ec_sensorhub.c111
-rw-r--r--drivers/platform/chrome/cros_ec_sensorhub_ring.c1046
-rw-r--r--drivers/platform/chrome/cros_ec_spi.c6
-rw-r--r--drivers/platform/chrome/cros_ec_sysfs.c36
-rw-r--r--drivers/platform/chrome/cros_ec_typec.c357
-rw-r--r--drivers/platform/chrome/cros_ec_vbc.c4
-rw-r--r--drivers/platform/chrome/cros_usbpd_notify.c306
-rw-r--r--drivers/platform/chrome/wilco_ec/event.c4
-rw-r--r--drivers/platform/chrome/wilco_ec/properties.c3
-rw-r--r--drivers/platform/chrome/wilco_ec/sysfs.c4
18 files changed, 1925 insertions, 97 deletions
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 5f57282a28da..03ea5129ed0c 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -7,7 +7,7 @@ config MFD_CROS_EC
tristate "Platform support for Chrome hardware (transitional)"
select CHROME_PLATFORMS
select CROS_EC
- select CONFIG_MFD_CROS_EC_DEV
+ select MFD_CROS_EC_DEV
depends on X86 || ARM || ARM64 || COMPILE_TEST
help
This is a transitional Kconfig option and will be removed after
@@ -214,6 +214,17 @@ config CROS_EC_SYSFS
To compile this driver as a module, choose M here: the
module will be called cros_ec_sysfs.
+config CROS_EC_TYPEC
+ tristate "ChromeOS EC Type-C Connector Control"
+ depends on MFD_CROS_EC_DEV && TYPEC
+ default MFD_CROS_EC_DEV
+ help
+ If you say Y here, you get support for accessing Type C connector
+ information from the Chrome OS EC.
+
+ To compile this driver as a module, choose M here: the module will be
+ called cros_ec_typec.
+
config CROS_USBPD_LOGGER
tristate "Logging driver for USB PD charger"
depends on CHARGER_CROS_USBPD
@@ -226,6 +237,20 @@ config CROS_USBPD_LOGGER
To compile this driver as a module, choose M here: the
module will be called cros_usbpd_logger.
+config CROS_USBPD_NOTIFY
+ tristate "ChromeOS Type-C power delivery event notifier"
+ depends on MFD_CROS_EC_DEV
+ default MFD_CROS_EC_DEV
+ help
+ If you say Y here, you get support for Type-C PD event notifications
+ from the ChromeOS EC. On ACPI platorms this driver will bind to the
+ GOOG0003 ACPI device, and on platforms which don't have this device it
+ will get initialized on ECs which support the feature
+ EC_FEATURE_USB_PD.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cros_usbpd_notify.
+
source "drivers/platform/chrome/wilco_ec/Kconfig"
endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index aacd5920d8a1..41baccba033f 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_CROS_EC_ISHTP) += cros_ec_ishtp.o
obj-$(CONFIG_CROS_EC_RPMSG) += cros_ec_rpmsg.o
obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_mec.o
+obj-$(CONFIG_CROS_EC_TYPEC) += cros_ec_typec.o
obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpcs.o
obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o cros_ec_trace.o
obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o
@@ -19,8 +20,10 @@ obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_chardev.o
obj-$(CONFIG_CROS_EC_LIGHTBAR) += cros_ec_lightbar.o
obj-$(CONFIG_CROS_EC_VBC) += cros_ec_vbc.o
obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o
-obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorhub.o
+cros-ec-sensorhub-objs := cros_ec_sensorhub.o cros_ec_sensorhub_ring.o
+obj-$(CONFIG_CROS_EC_SENSORHUB) += cros-ec-sensorhub.o
obj-$(CONFIG_CROS_EC_SYSFS) += cros_ec_sysfs.o
obj-$(CONFIG_CROS_USBPD_LOGGER) += cros_usbpd_logger.o
+obj-$(CONFIG_CROS_USBPD_NOTIFY) += cros_usbpd_notify.o
obj-$(CONFIG_WILCO_EC) += wilco_ec/
diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c
index 4f3651fcd9fe..472a03daa869 100644
--- a/drivers/platform/chrome/chromeos_laptop.c
+++ b/drivers/platform/chrome/chromeos_laptop.c
@@ -103,7 +103,7 @@ chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
pr_debug("%d-%02x is probed at %02x\n",
adapter->nr, info->addr, dummy->addr);
i2c_unregister_device(dummy);
- client = i2c_new_device(adapter, info);
+ client = i2c_new_client_device(adapter, info);
}
}
diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
index 6fc8f2c3ac51..3104680b7485 100644
--- a/drivers/platform/chrome/cros_ec.c
+++ b/drivers/platform/chrome/cros_ec.c
@@ -120,7 +120,7 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
- ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+ ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
/* For now, report failure to transition to S0ix with a warning. */
if (ret >= 0 && ec_dev->host_sleep_v1 &&
@@ -138,6 +138,24 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
return ret;
}
+static int cros_ec_ready_event(struct notifier_block *nb,
+ unsigned long queued_during_suspend,
+ void *_notify)
+{
+ struct cros_ec_device *ec_dev = container_of(nb, struct cros_ec_device,
+ notifier_ready);
+ u32 host_event = cros_ec_get_host_event(ec_dev);
+
+ if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INTERFACE_READY)) {
+ mutex_lock(&ec_dev->lock);
+ cros_ec_query_all(ec_dev);
+ mutex_unlock(&ec_dev->lock);
+ return NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
/**
* cros_ec_register() - Register a new ChromeOS EC, using the provided info.
* @ec_dev: Device to register.
@@ -237,6 +255,18 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
dev_dbg(ec_dev->dev, "Error %d clearing sleep event to ec",
err);
+ if (ec_dev->mkbp_event_supported) {
+ /*
+ * Register the notifier for EC_HOST_EVENT_INTERFACE_READY
+ * event.
+ */
+ ec_dev->notifier_ready.notifier_call = cros_ec_ready_event;
+ err = blocking_notifier_chain_register(&ec_dev->event_notifier,
+ &ec_dev->notifier_ready);
+ if (err)
+ return err;
+ }
+
dev_info(dev, "Chrome EC device registered\n");
return 0;
diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c
index c65e70bc168d..e0bce869c49a 100644
--- a/drivers/platform/chrome/cros_ec_chardev.c
+++ b/drivers/platform/chrome/cros_ec_chardev.c
@@ -48,7 +48,7 @@ struct ec_event {
struct list_head node;
size_t size;
u8 event_type;
- u8 data[0];
+ u8 data[];
};
static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
@@ -301,7 +301,7 @@ static long cros_ec_chardev_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
}
s_cmd->command += ec->cmd_offset;
- ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, s_cmd);
/* Only copy data to userland if data was received. */
if (ret < 0)
goto exit;
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index b4c110c5fee0..b59180bff5a3 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -116,7 +116,7 @@ static int get_lightbar_version(struct cros_ec_dev *ec,
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_VERSION;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0) {
ret = 0;
goto exit;
@@ -193,15 +193,10 @@ static ssize_t brightness_store(struct device *dev,
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
-
ret = count;
exit:
kfree(msg);
@@ -258,13 +253,10 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
goto exit;
}
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
- if (msg->result != EC_RES_SUCCESS)
- goto exit;
-
i = 0;
ok = 1;
}
@@ -305,14 +297,13 @@ static ssize_t sequence_show(struct device *dev,
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0)
- goto exit;
-
- if (msg->result != EC_RES_SUCCESS) {
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret == -EPROTO) {
ret = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
+ } else if (ret < 0) {
+ goto exit;
}
resp = (struct ec_response_lightbar *)msg->data;
@@ -344,13 +335,10 @@ static int lb_send_empty_cmd(struct cros_ec_dev *ec, uint8_t cmd)
if (ret)
goto error;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto error;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto error;
- }
+
ret = 0;
error:
kfree(msg);
@@ -377,13 +365,10 @@ static int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
if (ret)
goto error;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto error;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto error;
- }
+
ret = 0;
error:
kfree(msg);
@@ -425,15 +410,10 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
-
ret = count;
exit:
kfree(msg);
@@ -487,13 +467,9 @@ static ssize_t program_store(struct device *dev, struct device_attribute *attr,
*/
msg->outsize = count + extra_bytes;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
ret = count;
exit:
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 3cfa643f1d07..3e745e0fe092 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -553,7 +553,10 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
* replied with success status. It's not necessary to check msg->result when
* using this function.
*
- * Return: The number of bytes transferred on success or negative error code.
+ * Return:
+ * >=0 - The number of bytes transferred
+ * -ENOTSUPP - Operation not supported
+ * -EPROTO - Protocol error
*/
int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg)
@@ -563,6 +566,10 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
ret = cros_ec_cmd_xfer(ec_dev, msg);
if (ret < 0) {
dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret);
+ } else if (msg->result == EC_RES_INVALID_VERSION) {
+ dev_dbg(ec_dev->dev, "Command invalid version (err:%d)\n",
+ msg->result);
+ return -ENOTSUPP;
} else if (msg->result != EC_RES_SUCCESS) {
dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
diff --git a/drivers/platform/chrome/cros_ec_rpmsg.c b/drivers/platform/chrome/cros_ec_rpmsg.c
index dbc3f5523b83..7e8629e3db74 100644
--- a/drivers/platform/chrome/cros_ec_rpmsg.c
+++ b/drivers/platform/chrome/cros_ec_rpmsg.c
@@ -44,6 +44,8 @@ struct cros_ec_rpmsg {
struct completion xfer_ack;
struct work_struct host_event_work;
struct rpmsg_endpoint *ept;
+ bool has_pending_host_event;
+ bool probe_done;
};
/**
@@ -177,7 +179,14 @@ static int cros_ec_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
memcpy(ec_dev->din, resp->data, len);
complete(&ec_rpmsg->xfer_ack);
} else if (resp->type == HOST_EVENT_MARK) {
- schedule_work(&ec_rpmsg->host_event_work);
+ /*
+ * If the host event is sent before cros_ec_register is
+ * finished, queue the host event.
+ */
+ if (ec_rpmsg->probe_done)
+ schedule_work(&ec_rpmsg->host_event_work);
+ else
+ ec_rpmsg->has_pending_host_event = true;
} else {
dev_warn(ec_dev->dev, "rpmsg received invalid type = %d",
resp->type);
@@ -240,6 +249,11 @@ static int cros_ec_rpmsg_probe(struct rpmsg_device *rpdev)
return ret;
}
+ ec_rpmsg->probe_done = true;
+
+ if (ec_rpmsg->has_pending_host_event)
+ schedule_work(&ec_rpmsg->host_event_work);
+
return 0;
}
diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c
index 79fefd3bb0fa..b7f2c00db5e1 100644
--- a/drivers/platform/chrome/cros_ec_sensorhub.c
+++ b/drivers/platform/chrome/cros_ec_sensorhub.c
@@ -50,10 +50,8 @@ static int cros_ec_sensorhub_register(struct device *dev,
struct cros_ec_sensorhub *sensorhub)
{
int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
+ struct cros_ec_command *msg = sensorhub->msg;
struct cros_ec_dev *ec = sensorhub->ec;
- struct ec_params_motion_sense *params;
- struct ec_response_motion_sense *resp;
- struct cros_ec_command *msg;
int ret, i, sensor_num;
char *name;
@@ -65,27 +63,19 @@ static int cros_ec_sensorhub_register(struct device *dev,
return sensor_num;
}
+ sensorhub->sensor_num = sensor_num;
if (sensor_num == 0) {
dev_err(dev, "Zero sensors reported.\n");
return -EINVAL;
}
- /* Prepare a message to send INFO command to each sensor. */
- msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
- GFP_KERNEL);
- if (!msg)
- return -ENOMEM;
-
msg->version = 1;
- msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
- msg->outsize = sizeof(*params);
- msg->insize = sizeof(*resp);
- params = (struct ec_params_motion_sense *)msg->data;
- resp = (struct ec_response_motion_sense *)msg->data;
+ msg->insize = sizeof(struct ec_response_motion_sense);
+ msg->outsize = sizeof(struct ec_params_motion_sense);
for (i = 0; i < sensor_num; i++) {
- params->cmd = MOTIONSENSE_CMD_INFO;
- params->info.sensor_num = i;
+ sensorhub->params->cmd = MOTIONSENSE_CMD_INFO;
+ sensorhub->params->info.sensor_num = i;
ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0) {
@@ -94,7 +84,7 @@ static int cros_ec_sensorhub_register(struct device *dev,
continue;
}
- switch (resp->info.type) {
+ switch (sensorhub->resp->info.type) {
case MOTIONSENSE_TYPE_ACCEL:
name = "cros-ec-accel";
break;
@@ -117,15 +107,16 @@ static int cros_ec_sensorhub_register(struct device *dev,
name = "cros-ec-activity";
break;
default:
- dev_warn(dev, "unknown type %d\n", resp->info.type);
+ dev_warn(dev, "unknown type %d\n",
+ sensorhub->resp->info.type);
continue;
}
ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
if (ret)
- goto error;
+ return ret;
- sensor_type[resp->info.type]++;
+ sensor_type[sensorhub->resp->info.type]++;
}
if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
@@ -137,29 +128,41 @@ static int cros_ec_sensorhub_register(struct device *dev,
"cros-ec-lid-angle",
0);
if (ret)
- goto error;
+ return ret;
}
- kfree(msg);
return 0;
-
-error:
- kfree(msg);
- return ret;
}
static int cros_ec_sensorhub_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
struct cros_ec_sensorhub *data;
+ struct cros_ec_command *msg;
int ret;
int i;
+ msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) +
+ max((u16)sizeof(struct ec_params_motion_sense),
+ ec->ec_dev->max_response), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+
data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
if (!data)
return -ENOMEM;
- data->ec = dev_get_drvdata(dev->parent);
+ mutex_init(&data->cmd_lock);
+
+ data->dev = dev;
+ data->ec = ec;
+ data->msg = msg;
+ data->params = (struct ec_params_motion_sense *)msg->data;
+ data->resp = (struct ec_response_motion_sense *)msg->data;
+
dev_set_drvdata(dev, data);
/* Check whether this EC is a sensor hub. */
@@ -172,7 +175,8 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
* If the device has sensors but does not claim to
* be a sensor hub, we are in legacy mode.
*/
- for (i = 0; i < 2; i++) {
+ data->sensor_num = 2;
+ for (i = 0; i < data->sensor_num; i++) {
ret = cros_ec_sensorhub_allocate_sensor(dev,
"cros-ec-accel-legacy", i);
if (ret)
@@ -180,12 +184,63 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
}
}
+ /*
+ * If the EC does not have a FIFO, the sensors will query their data
+ * themselves via sysfs or a software trigger.
+ */
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
+ ret = cros_ec_sensorhub_ring_add(data);
+ if (ret)
+ return ret;
+ /*
+ * The msg and its data is not under the control of the ring
+ * handler.
+ */
+ return devm_add_action_or_reset(dev,
+ cros_ec_sensorhub_ring_remove,
+ data);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * When the EC is suspending, we must stop sending interrupt,
+ * we may use the same interrupt line for waking up the device.
+ * Tell the EC to stop sending non-interrupt event on the iio ring.
+ */
+static int cros_ec_sensorhub_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
+ struct cros_ec_dev *ec = sensorhub->ec;
+
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
+ return cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
return 0;
}
+static int cros_ec_sensorhub_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
+ struct cros_ec_dev *ec = sensorhub->ec;
+
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
+ return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cros_ec_sensorhub_pm_ops,
+ cros_ec_sensorhub_suspend,
+ cros_ec_sensorhub_resume);
+
static struct platform_driver cros_ec_sensorhub_driver = {
.driver = {
.name = DRV_NAME,
+ .pm = &cros_ec_sensorhub_pm_ops,
},
.probe = cros_ec_sensorhub_probe,
};
diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
new file mode 100644
index 000000000000..230e6cf3da2f
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
@@ -0,0 +1,1046 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Chrome OS EC Sensor hub FIFO.
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_ec_sensorhub.h>
+#include <linux/platform_device.h>
+#include <linux/sort.h>
+#include <linux/slab.h>
+
+/* Precision of fixed point for the m values from the filter */
+#define M_PRECISION BIT(23)
+
+/* Only activate the filter once we have at least this many elements. */
+#define TS_HISTORY_THRESHOLD 8
+
+/*
+ * If we don't have any history entries for this long, empty the filter to
+ * make sure there are no big discontinuities.
+ */
+#define TS_HISTORY_BORED_US 500000
+
+/* To measure by how much the filter is overshooting, if it happens. */
+#define FUTURE_TS_ANALYTICS_COUNT_MAX 100
+
+static inline int
+cros_sensorhub_send_sample(struct cros_ec_sensorhub *sensorhub,
+ struct cros_ec_sensors_ring_sample *sample)
+{
+ cros_ec_sensorhub_push_data_cb_t cb;
+ int id = sample->sensor_id;
+ struct iio_dev *indio_dev;
+
+ if (id > sensorhub->sensor_num)
+ return -EINVAL;
+
+ cb = sensorhub->push_data[id].push_data_cb;
+ if (!cb)
+ return 0;
+
+ indio_dev = sensorhub->push_data[id].indio_dev;
+
+ if (sample->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH)
+ return 0;
+
+ return cb(indio_dev, sample->vector, sample->timestamp);
+}
+
+/**
+ * cros_ec_sensorhub_register_push_data() - register the callback to the hub.
+ *
+ * @sensorhub : Sensor Hub object
+ * @sensor_num : The sensor the caller is interested in.
+ * @indio_dev : The iio device to use when a sample arrives.
+ * @cb : The callback to call when a sample arrives.
+ *
+ * The callback cb will be used by cros_ec_sensorhub_ring to distribute events
+ * from the EC.
+ *
+ * Return: 0 when callback is registered.
+ * EINVAL is the sensor number is invalid or the slot already used.
+ */
+int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub,
+ u8 sensor_num,
+ struct iio_dev *indio_dev,
+ cros_ec_sensorhub_push_data_cb_t cb)
+{
+ if (sensor_num >= sensorhub->sensor_num)
+ return -EINVAL;
+ if (sensorhub->push_data[sensor_num].indio_dev)
+ return -EINVAL;
+
+ sensorhub->push_data[sensor_num].indio_dev = indio_dev;
+ sensorhub->push_data[sensor_num].push_data_cb = cb;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensorhub_register_push_data);
+
+void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub,
+ u8 sensor_num)
+{
+ sensorhub->push_data[sensor_num].indio_dev = NULL;
+ sensorhub->push_data[sensor_num].push_data_cb = NULL;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensorhub_unregister_push_data);
+
+/**
+ * cros_ec_sensorhub_ring_fifo_enable() - Enable or disable interrupt generation
+ * for FIFO events.
+ * @sensorhub: Sensor Hub object
+ * @on: true when events are requested.
+ *
+ * To be called before sleeping or when noone is listening.
+ * Return: 0 on success, or an error when we can not communicate with the EC.
+ *
+ */
+int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub,
+ bool on)
+{
+ int ret, i;
+
+ mutex_lock(&sensorhub->cmd_lock);
+ if (sensorhub->tight_timestamps)
+ for (i = 0; i < sensorhub->sensor_num; i++)
+ sensorhub->batch_state[i].last_len = 0;
+
+ sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INT_ENABLE;
+ sensorhub->params->fifo_int_enable.enable = on;
+
+ sensorhub->msg->outsize = sizeof(struct ec_params_motion_sense);
+ sensorhub->msg->insize = sizeof(struct ec_response_motion_sense);
+
+ ret = cros_ec_cmd_xfer_status(sensorhub->ec->ec_dev, sensorhub->msg);
+ mutex_unlock(&sensorhub->cmd_lock);
+
+ /* We expect to receive a payload of 4 bytes, ignore. */
+ if (ret > 0)
+ ret = 0;
+
+ return ret;
+}
+
+static int cros_ec_sensor_ring_median_cmp(const void *pv1, const void *pv2)
+{
+ s64 v1 = *(s64 *)pv1;
+ s64 v2 = *(s64 *)pv2;
+
+ if (v1 > v2)
+ return 1;
+ else if (v1 < v2)
+ return -1;
+ else
+ return 0;
+}
+
+/*
+ * cros_ec_sensor_ring_median: Gets median of an array of numbers
+ *
+ * For now it's implemented using an inefficient > O(n) sort then return
+ * the middle element. A more optimal method would be something like
+ * quickselect, but given that n = 64 we can probably live with it in the
+ * name of clarity.
+ *
+ * Warning: the input array gets modified (sorted)!
+ */
+static s64 cros_ec_sensor_ring_median(s64 *array, size_t length)
+{
+ sort(array, length, sizeof(s64), cros_ec_sensor_ring_median_cmp, NULL);
+ return array[length / 2];
+}
+
+/*
+ * IRQ Timestamp Filtering
+ *
+ * Lower down in cros_ec_sensor_ring_process_event(), for each sensor event
+ * we have to calculate it's timestamp in the AP timebase. There are 3 time
+ * points:
+ * a - EC timebase, sensor event
+ * b - EC timebase, IRQ
+ * c - AP timebase, IRQ
+ * a' - what we want: sensor even in AP timebase
+ *
+ * While a and b are recorded at accurate times (due to the EC real time
+ * nature); c is pretty untrustworthy, even though it's recorded the
+ * first thing in ec_irq_handler(). There is a very good change we'll get
+ * added lantency due to:
+ * other irqs
+ * ddrfreq
+ * cpuidle
+ *
+ * Normally a' = c - b + a, but if we do that naive math any jitter in c
+ * will get coupled in a', which we don't want. We want a function
+ * a' = cros_ec_sensor_ring_ts_filter(a) which will filter out outliers in c.
+ *
+ * Think of a graph of AP time(b) on the y axis vs EC time(c) on the x axis.
+ * The slope of the line won't be exactly 1, there will be some clock drift
+ * between the 2 chips for various reasons (mechanical stress, temperature,
+ * voltage). We need to extrapolate values for a future x, without trusting
+ * recent y values too much.
+ *
+ * We use a median filter for the slope, then another median filter for the
+ * y-intercept to calculate this function:
+ * dx[n] = x[n-1] - x[n]
+ * dy[n] = x[n-1] - x[n]
+ * m[n] = dy[n] / dx[n]
+ * median_m = median(m[n-k:n])
+ * error[i] = y[n-i] - median_m * x[n-i]
+ * median_error = median(error[:k])
+ * predicted_y = median_m * x + median_error
+ *
+ * Implementation differences from above:
+ * - Redefined y to be actually c - b, this gives us a lot more precision
+ * to do the math. (c-b)/b variations are more obvious than c/b variations.
+ * - Since we don't have floating point, any operations involving slope are
+ * done using fixed point math (*M_PRECISION)
+ * - Since x and y grow with time, we keep zeroing the graph (relative to
+ * the last sample), this way math involving *x[n-i] will not overflow
+ * - EC timestamps are kept in us, it improves the slope calculation precision
+ */
+
+/**
+ * cros_ec_sensor_ring_ts_filter_update() - Update filter history.
+ *
+ * @state: Filter information.
+ * @b: IRQ timestamp, EC timebase (us)
+ * @c: IRQ timestamp, AP timebase (ns)
+ *
+ * Given a new IRQ timestamp pair (EC and AP timebases), add it to the filter
+ * history.
+ */
+static void
+cros_ec_sensor_ring_ts_filter_update(struct cros_ec_sensors_ts_filter_state
+ *state,
+ s64 b, s64 c)
+{
+ s64 x, y;
+ s64 dx, dy;
+ s64 m; /* stored as *M_PRECISION */
+ s64 *m_history_copy = state->temp_buf;
+ s64 *error = state->temp_buf;
+ int i;
+
+ /* we trust b the most, that'll be our independent variable */
+ x = b;
+ /* y is the offset between AP and EC times, in ns */
+ y = c - b * 1000;
+
+ dx = (state->x_history[0] + state->x_offset) - x;
+ if (dx == 0)
+ return; /* we already have this irq in the history */
+ dy = (state->y_history[0] + state->y_offset) - y;
+ m = div64_s64(dy * M_PRECISION, dx);
+
+ /* Empty filter if we haven't seen any action in a while. */
+ if (-dx > TS_HISTORY_BORED_US)
+ state->history_len = 0;
+
+ /* Move everything over, also update offset to all absolute coords .*/
+ for (i = state->history_len - 1; i >= 1; i--) {
+ state->x_history[i] = state->x_history[i - 1] + dx;
+ state->y_history[i] = state->y_history[i - 1] + dy;
+
+ state->m_history[i] = state->m_history[i - 1];
+ /*
+ * Also use the same loop to copy m_history for future
+ * median extraction.
+ */
+ m_history_copy[i] = state->m_history[i - 1];
+ }
+
+ /* Store the x and y, but remember offset is actually last sample. */
+ state->x_offset = x;
+ state->y_offset = y;
+ state->x_history[0] = 0;
+ state->y_history[0] = 0;
+
+ state->m_history[0] = m;
+ m_history_copy[0] = m;
+
+ if (state->history_len < CROS_EC_SENSORHUB_TS_HISTORY_SIZE)
+ state->history_len++;
+
+ /* Precalculate things for the filter. */
+ if (state->history_len > TS_HISTORY_THRESHOLD) {
+ state->median_m =
+ cros_ec_sensor_ring_median(m_history_copy,
+ state->history_len - 1);
+
+ /*
+ * Calculate y-intercepts as if m_median is the slope and
+ * points in the history are on the line. median_error will
+ * still be in the offset coordinate system.
+ */
+ for (i = 0; i < state->history_len; i++)
+ error[i] = state->y_history[i] -
+ div_s64(state->median_m * state->x_history[i],
+ M_PRECISION);
+ state->median_error =
+ cros_ec_sensor_ring_median(error, state->history_len);
+ } else {
+ state->median_m = 0;
+ state->median_error = 0;
+ }
+}
+
+/**
+ * cros_ec_sensor_ring_ts_filter() - Translate EC timebase timestamp to AP
+ * timebase
+ *
+ * @state: filter information.
+ * @x: any ec timestamp (us):
+ *
+ * cros_ec_sensor_ring_ts_filter(a) => a' event timestamp, AP timebase
+ * cros_ec_sensor_ring_ts_filter(b) => calculated timestamp when the EC IRQ
+ * should have happened on the AP, with low jitter
+ *
+ * Note: The filter will only activate once state->history_len goes
+ * over TS_HISTORY_THRESHOLD. Otherwise it'll just do the naive c - b + a
+ * transform.
+ *
+ * How to derive the formula, starting from:
+ * f(x) = median_m * x + median_error
+ * That's the calculated AP - EC offset (at the x point in time)
+ * Undo the coordinate system transform:
+ * f(x) = median_m * (x - x_offset) + median_error + y_offset
+ * Remember to undo the "y = c - b * 1000" modification:
+ * f(x) = median_m * (x - x_offset) + median_error + y_offset + x * 1000
+ *
+ * Return: timestamp in AP timebase (ns)
+ */
+static s64
+cros_ec_sensor_ring_ts_filter(struct cros_ec_sensors_ts_filter_state *state,
+ s64 x)
+{
+ return div_s64(state->median_m * (x - state->x_offset), M_PRECISION)
+ + state->median_error + state->y_offset + x * 1000;
+}
+
+/*
+ * Since a and b were originally 32 bit values from the EC,
+ * they overflow relatively often, casting is not enough, so we need to
+ * add an offset.
+ */
+static void
+cros_ec_sensor_ring_fix_overflow(s64 *ts,
+ const s64 overflow_period,
+ struct cros_ec_sensors_ec_overflow_state
+ *state)
+{
+ s64 adjust;
+
+ *ts += state->offset;
+ if (abs(state->last - *ts) > (overflow_period / 2)) {
+ adjust = state->last > *ts ? overflow_period : -overflow_period;
+ state->offset += adjust;
+ *ts += adjust;
+ }
+ state->last = *ts;
+}
+
+static void
+cros_ec_sensor_ring_check_for_past_timestamp(struct cros_ec_sensorhub
+ *sensorhub,
+ struct cros_ec_sensors_ring_sample
+ *sample)
+{
+ const u8 sensor_id = sample->sensor_id;
+
+ /* If this event is earlier than one we saw before... */
+ if (sensorhub->batch_state[sensor_id].newest_sensor_event >
+ sample->timestamp)
+ /* mark it for spreading. */
+ sample->timestamp =
+ sensorhub->batch_state[sensor_id].last_ts;
+ else
+ sensorhub->batch_state[sensor_id].newest_sensor_event =
+ sample->timestamp;
+}
+
+/**
+ * cros_ec_sensor_ring_process_event() - Process one EC FIFO event
+ *
+ * @sensorhub: Sensor Hub object.
+ * @fifo_info: FIFO information from the EC (includes b point, EC timebase).
+ * @fifo_timestamp: EC IRQ, kernel timebase (aka c).
+ * @current_timestamp: calculated event timestamp, kernel timebase (aka a').
+ * @in: incoming FIFO event from EC (includes a point, EC timebase).
+ * @out: outgoing event to user space (includes a').
+ *
+ * Process one EC event, add it in the ring if necessary.
+ *
+ * Return: true if out event has been populated.
+ */
+static bool
+cros_ec_sensor_ring_process_event(struct cros_ec_sensorhub *sensorhub,
+ const struct ec_response_motion_sense_fifo_info
+ *fifo_info,
+ const ktime_t fifo_timestamp,
+ ktime_t *current_timestamp,
+ struct ec_response_motion_sensor_data *in,
+ struct cros_ec_sensors_ring_sample *out)
+{
+ const s64 now = cros_ec_get_time_ns();
+ int axis, async_flags;
+
+ /* Do not populate the filter based on asynchronous events. */
+ async_flags = in->flags &
+ (MOTIONSENSE_SENSOR_FLAG_ODR | MOTIONSENSE_SENSOR_FLAG_FLUSH);
+
+ if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP && !async_flags) {
+ s64 a = in->timestamp;
+ s64 b = fifo_info->timestamp;
+ s64 c = fifo_timestamp;
+
+ cros_ec_sensor_ring_fix_overflow(&a, 1LL << 32,
+ &sensorhub->overflow_a);
+ cros_ec_sensor_ring_fix_overflow(&b, 1LL << 32,
+ &sensorhub->overflow_b);
+
+ if (sensorhub->tight_timestamps) {
+ cros_ec_sensor_ring_ts_filter_update(
+ &sensorhub->filter, b, c);
+ *current_timestamp = cros_ec_sensor_ring_ts_filter(
+ &sensorhub->filter, a);
+ } else {
+ s64 new_timestamp;
+
+ /*
+ * Disable filtering since we might add more jitter
+ * if b is in a random point in time.
+ */
+ new_timestamp = fifo_timestamp -
+ fifo_info->timestamp * 1000 +
+ in->timestamp * 1000;
+ /*
+ * The timestamp can be stale if we had to use the fifo
+ * info timestamp.
+ */
+ if (new_timestamp - *current_timestamp > 0)
+ *current_timestamp = new_timestamp;
+ }
+ }
+
+ if (in->flags & MOTIONSENSE_SENSOR_FLAG_ODR) {
+ if (sensorhub->tight_timestamps) {
+ sensorhub->batch_state[in->sensor_num].last_len = 0;
+ sensorhub->batch_state[in->sensor_num].penul_len = 0;
+ }
+ /*
+ * ODR change is only useful for the sensor_ring, it does not
+ * convey information to clients.
+ */
+ return false;
+ }
+
+ if (in->flags & MOTIONSENSE_SENSOR_FLAG_FLUSH) {
+ out->sensor_id = in->sensor_num;
+ out->timestamp = *current_timestamp;
+ out->flag = in->flags;
+ if (sensorhub->tight_timestamps)
+ sensorhub->batch_state[out->sensor_id].last_len = 0;
+ /*
+ * No other payload information provided with
+ * flush ack.
+ */
+ return true;
+ }
+
+ if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP)
+ /* If we just have a timestamp, skip this entry. */
+ return false;
+
+ /* Regular sample */
+ out->sensor_id = in->sensor_num;
+ if (*current_timestamp - now > 0) {
+ /*
+ * This fix is needed to overcome the timestamp filter putting
+ * events in the future.
+ */
+ sensorhub->future_timestamp_total_ns +=
+ *current_timestamp - now;
+ if (++sensorhub->future_timestamp_count ==
+ FUTURE_TS_ANALYTICS_COUNT_MAX) {
+ s64 avg = div_s64(sensorhub->future_timestamp_total_ns,
+ sensorhub->future_timestamp_count);
+ dev_warn_ratelimited(sensorhub->dev,
+ "100 timestamps in the future, %lldns shaved on average\n",
+ avg);
+ sensorhub->future_timestamp_count = 0;
+ sensorhub->future_timestamp_total_ns = 0;
+ }
+ out->timestamp = now;
+ } else {
+ out->timestamp = *current_timestamp;
+ }
+
+ out->flag = in->flags;
+ for (axis = 0; axis < 3; axis++)
+ out->vector[axis] = in->data[axis];
+
+ if (sensorhub->tight_timestamps)
+ cros_ec_sensor_ring_check_for_past_timestamp(sensorhub, out);
+ return true;
+}
+
+/*
+ * cros_ec_sensor_ring_spread_add: Calculate proper timestamps then add to
+ * ringbuffer.
+ *
+ * This is the new spreading code, assumes every sample's timestamp
+ * preceeds the sample. Run if tight_timestamps == true.
+ *
+ * Sometimes the EC receives only one interrupt (hence timestamp) for
+ * a batch of samples. Only the first sample will have the correct
+ * timestamp. So we must interpolate the other samples.
+ * We use the previous batch timestamp and our current batch timestamp
+ * as a way to calculate period, then spread the samples evenly.
+ *
+ * s0 int, 0ms
+ * s1 int, 10ms
+ * s2 int, 20ms
+ * 30ms point goes by, no interrupt, previous one is still asserted
+ * downloading s2 and s3
+ * s3 sample, 20ms (incorrect timestamp)
+ * s4 int, 40ms
+ *
+ * The batches are [(s0), (s1), (s2, s3), (s4)]. Since the 3rd batch
+ * has 2 samples in them, we adjust the timestamp of s3.
+ * s2 - s1 = 10ms, so s3 must be s2 + 10ms => 20ms. If s1 would have
+ * been part of a bigger batch things would have gotten a little
+ * more complicated.
+ *
+ * Note: we also assume another sensor sample doesn't break up a batch
+ * in 2 or more partitions. Example, there can't ever be a sync sensor
+ * in between S2 and S3. This simplifies the following code.
+ */
+static void
+cros_ec_sensor_ring_spread_add(struct cros_ec_sensorhub *sensorhub,
+ unsigned long sensor_mask,
+ struct cros_ec_sensors_ring_sample *last_out)
+{
+ struct cros_ec_sensors_ring_sample *batch_start, *next_batch_start;
+ int id;
+
+ for_each_set_bit(id, &sensor_mask, sensorhub->sensor_num) {
+ for (batch_start = sensorhub->ring; batch_start < last_out;
+ batch_start = next_batch_start) {
+ /*
+ * For each batch (where all samples have the same
+ * timestamp).
+ */
+ int batch_len, sample_idx;
+ struct cros_ec_sensors_ring_sample *batch_end =
+ batch_start;
+ struct cros_ec_sensors_ring_sample *s;
+ s64 batch_timestamp = batch_start->timestamp;
+ s64 sample_period;
+
+ /*
+ * Skip over batches that start with the sensor types
+ * we're not looking at right now.
+ */
+ if (batch_start->sensor_id != id) {
+ next_batch_start = batch_start + 1;
+ continue;
+ }
+
+ /*
+ * Do not start a batch
+ * from a flush, as it happens asynchronously to the
+ * regular flow of events.
+ */
+ if (batch_start->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH) {
+ cros_sensorhub_send_sample(sensorhub,
+ batch_start);
+ next_batch_start = batch_start + 1;
+ continue;
+ }
+
+ if (batch_start->timestamp <=
+ sensorhub->batch_state[id].last_ts) {
+ batch_timestamp =
+ sensorhub->batch_state[id].last_ts;
+ batch_len = sensorhub->batch_state[id].last_len;
+
+ sample_idx = batch_len;
+
+ sensorhub->batch_state[id].last_ts =
+ sensorhub->batch_state[id].penul_ts;
+ sensorhub->batch_state[id].last_len =
+ sensorhub->batch_state[id].penul_len;
+ } else {
+ /*
+ * Push first sample in the batch to the,
+ * kifo, it's guaranteed to be correct, the
+ * rest will follow later on.
+ */
+ sample_idx = 1;
+ batch_len = 1;
+ cros_sensorhub_send_sample(sensorhub,
+ batch_start);
+ batch_start++;
+ }
+
+ /* Find all samples have the same timestamp. */
+ for (s = batch_start; s < last_out; s++) {
+ if (s->sensor_id != id)
+ /*
+ * Skip over other sensor types that
+ * are interleaved, don't count them.
+ */
+ continue;
+ if (s->timestamp != batch_timestamp)
+ /* we discovered the next batch */
+ break;
+ if (s->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH)
+ /* break on flush packets */
+ break;
+ batch_end = s;
+ batch_len++;
+ }
+
+ if (batch_len == 1)
+ goto done_with_this_batch;
+
+ /* Can we calculate period? */
+ if (sensorhub->batch_state[id].last_len == 0) {
+ dev_warn(sensorhub->dev, "Sensor %d: lost %d samples when spreading\n",
+ id, batch_len - 1);
+ goto done_with_this_batch;
+ /*
+ * Note: we're dropping the rest of the samples
+ * in this batch since we have no idea where
+ * they're supposed to go without a period
+ * calculation.
+ */
+ }
+
+ sample_period = div_s64(batch_timestamp -
+ sensorhub->batch_state[id].last_ts,
+ sensorhub->batch_state[id].last_len);
+ dev_dbg(sensorhub->dev,
+ "Adjusting %d samples, sensor %d last_batch @%lld (%d samples) batch_timestamp=%lld => period=%lld\n",
+ batch_len, id,
+ sensorhub->batch_state[id].last_ts,
+ sensorhub->batch_state[id].last_len,
+ batch_timestamp,
+ sample_period);
+
+ /*
+ * Adjust timestamps of the samples then push them to
+ * kfifo.
+ */
+ for (s = batch_start; s <= batch_end; s++) {
+ if (s->sensor_id != id)
+ /*
+ * Skip over other sensor types that
+ * are interleaved, don't change them.
+ */
+ continue;
+
+ s->timestamp = batch_timestamp +
+ sample_period * sample_idx;
+ sample_idx++;
+
+ cros_sensorhub_send_sample(sensorhub, s);
+ }
+
+done_with_this_batch:
+ sensorhub->batch_state[id].penul_ts =
+ sensorhub->batch_state[id].last_ts;
+ sensorhub->batch_state[id].penul_len =
+ sensorhub->batch_state[id].last_len;
+
+ sensorhub->batch_state[id].last_ts =
+ batch_timestamp;
+ sensorhub->batch_state[id].last_len = batch_len;
+
+ next_batch_start = batch_end + 1;
+ }
+ }
+}
+
+/*
+ * cros_ec_sensor_ring_spread_add_legacy: Calculate proper timestamps then
+ * add to ringbuffer (legacy).
+ *
+ * Note: This assumes we're running old firmware, where every sample's timestamp
+ * is after the sample. Run if tight_timestamps == false.
+ *
+ * If there is a sample with a proper timestamp
+ *
+ * timestamp | count
+ * -----------------
+ * older_unprocess_out --> TS1 | 1
+ * TS1 | 2
+ * out --> TS1 | 3
+ * next_out --> TS2 |
+ *
+ * We spread time for the samples [older_unprocess_out .. out]
+ * between TS1 and TS2: [TS1+1/4, TS1+2/4, TS1+3/4, TS2].
+ *
+ * If we reach the end of the samples, we compare with the
+ * current timestamp:
+ *
+ * older_unprocess_out --> TS1 | 1
+ * TS1 | 2
+ * out --> TS1 | 3
+ *
+ * We know have [TS1+1/3, TS1+2/3, current timestamp]
+ */
+static void
+cros_ec_sensor_ring_spread_add_legacy(struct cros_ec_sensorhub *sensorhub,
+ unsigned long sensor_mask,
+ s64 current_timestamp,
+ struct cros_ec_sensors_ring_sample
+ *last_out)
+{
+ struct cros_ec_sensors_ring_sample *out;
+ int i;
+
+ for_each_set_bit(i, &sensor_mask, sensorhub->sensor_num) {
+ s64 older_timestamp;
+ s64 timestamp;
+ struct cros_ec_sensors_ring_sample *older_unprocess_out =
+ sensorhub->ring;
+ struct cros_ec_sensors_ring_sample *next_out;
+ int count = 1;
+
+ for (out = sensorhub->ring; out < last_out; out = next_out) {
+ s64 time_period;
+
+ next_out = out + 1;
+ if (out->sensor_id != i)
+ continue;
+
+ /* Timestamp to start with */
+ older_timestamp = out->timestamp;
+
+ /* Find next sample. */
+ while (next_out < last_out && next_out->sensor_id != i)
+ next_out++;
+
+ if (next_out >= last_out) {
+ timestamp = current_timestamp;
+ } else {
+ timestamp = next_out->timestamp;
+ if (timestamp == older_timestamp) {
+ count++;
+ continue;
+ }
+ }
+
+ /*
+ * The next sample has a new timestamp, spread the
+ * unprocessed samples.
+ */
+ if (next_out < last_out)
+ count++;
+ time_period = div_s64(timestamp - older_timestamp,
+ count);
+
+ for (; older_unprocess_out <= out;
+ older_unprocess_out++) {
+ if (older_unprocess_out->sensor_id != i)
+ continue;
+ older_timestamp += time_period;
+ older_unprocess_out->timestamp =
+ older_timestamp;
+ }
+ count = 1;
+ /* The next_out sample has a valid timestamp, skip. */
+ next_out++;
+ older_unprocess_out = next_out;
+ }
+ }
+
+ /* Push the event into the kfifo */
+ for (out = sensorhub->ring; out < last_out; out++)
+ cros_sensorhub_send_sample(sensorhub, out);
+}
+
+/**
+ * cros_ec_sensorhub_ring_handler() - The trigger handler function
+ *
+ * @sensorhub: Sensor Hub object.
+ *
+ * Called by the notifier, process the EC sensor FIFO queue.
+ */
+static void cros_ec_sensorhub_ring_handler(struct cros_ec_sensorhub *sensorhub)
+{
+ struct ec_response_motion_sense_fifo_info *fifo_info =
+ sensorhub->fifo_info;
+ struct cros_ec_dev *ec = sensorhub->ec;
+ ktime_t fifo_timestamp, current_timestamp;
+ int i, j, number_data, ret;
+ unsigned long sensor_mask = 0;
+ struct ec_response_motion_sensor_data *in;
+ struct cros_ec_sensors_ring_sample *out, *last_out;
+
+ mutex_lock(&sensorhub->cmd_lock);
+
+ /* Get FIFO information if there are lost vectors. */
+ if (fifo_info->total_lost) {
+ int fifo_info_length =
+ sizeof(struct ec_response_motion_sense_fifo_info) +
+ sizeof(u16) * sensorhub->sensor_num;
+
+ /* Need to retrieve the number of lost vectors per sensor */
+ sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
+ sensorhub->msg->outsize = 1;
+ sensorhub->msg->insize = fifo_info_length;
+
+ if (cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg) < 0)
+ goto error;
+
+ memcpy(fifo_info, &sensorhub->resp->fifo_info,
+ fifo_info_length);
+
+ /*
+ * Update collection time, will not be as precise as the
+ * non-error case.
+ */
+ fifo_timestamp = cros_ec_get_time_ns();
+ } else {
+ fifo_timestamp = sensorhub->fifo_timestamp[
+ CROS_EC_SENSOR_NEW_TS];
+ }
+
+ if (fifo_info->count > sensorhub->fifo_size ||
+ fifo_info->size != sensorhub->fifo_size) {
+ dev_warn(sensorhub->dev,
+ "Mismatch EC data: count %d, size %d - expected %d",
+ fifo_info->count, fifo_info->size,
+ sensorhub->fifo_size);
+ goto error;
+ }
+
+ /* Copy elements in the main fifo */
+ current_timestamp = sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS];
+ out = sensorhub->ring;
+ for (i = 0; i < fifo_info->count; i += number_data) {
+ sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_READ;
+ sensorhub->params->fifo_read.max_data_vector =
+ fifo_info->count - i;
+ sensorhub->msg->outsize =
+ sizeof(struct ec_params_motion_sense);
+ sensorhub->msg->insize =
+ sizeof(sensorhub->resp->fifo_read) +
+ sensorhub->params->fifo_read.max_data_vector *
+ sizeof(struct ec_response_motion_sensor_data);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
+ if (ret < 0) {
+ dev_warn(sensorhub->dev, "Fifo error: %d\n", ret);
+ break;
+ }
+ number_data = sensorhub->resp->fifo_read.number_data;
+ if (number_data == 0) {
+ dev_dbg(sensorhub->dev, "Unexpected empty FIFO\n");
+ break;
+ }
+ if (number_data > fifo_info->count - i) {
+ dev_warn(sensorhub->dev,
+ "Invalid EC data: too many entry received: %d, expected %d",
+ number_data, fifo_info->count - i);
+ break;
+ }
+ if (out + number_data >
+ sensorhub->ring + fifo_info->count) {
+ dev_warn(sensorhub->dev,
+ "Too many samples: %d (%zd data) to %d entries for expected %d entries",
+ i, out - sensorhub->ring, i + number_data,
+ fifo_info->count);
+ break;
+ }
+
+ for (in = sensorhub->resp->fifo_read.data, j = 0;
+ j < number_data; j++, in++) {
+ if (cros_ec_sensor_ring_process_event(
+ sensorhub, fifo_info,
+ fifo_timestamp,
+ &current_timestamp,
+ in, out)) {
+ sensor_mask |= BIT(in->sensor_num);
+ out++;
+ }
+ }
+ }
+ mutex_unlock(&sensorhub->cmd_lock);
+ last_out = out;
+
+ if (out == sensorhub->ring)
+ /* Unexpected empty FIFO. */
+ goto ring_handler_end;
+
+ /*
+ * Check if current_timestamp is ahead of the last sample. Normally,
+ * the EC appends a timestamp after the last sample, but if the AP
+ * is slow to respond to the IRQ, the EC may have added new samples.
+ * Use the FIFO info timestamp as last timestamp then.
+ */
+ if (!sensorhub->tight_timestamps &&
+ (last_out - 1)->timestamp == current_timestamp)
+ current_timestamp = fifo_timestamp;
+
+ /* Warn on lost samples. */
+ if (fifo_info->total_lost)
+ for (i = 0; i < sensorhub->sensor_num; i++) {
+ if (fifo_info->lost[i]) {
+ dev_warn_ratelimited(sensorhub->dev,
+ "Sensor %d: lost: %d out of %d\n",
+ i, fifo_info->lost[i],
+ fifo_info->total_lost);
+ if (sensorhub->tight_timestamps)
+ sensorhub->batch_state[i].last_len = 0;
+ }
+ }
+
+ /*
+ * Spread samples in case of batching, then add them to the
+ * ringbuffer.
+ */
+ if (sensorhub->tight_timestamps)
+ cros_ec_sensor_ring_spread_add(sensorhub, sensor_mask,
+ last_out);
+ else
+ cros_ec_sensor_ring_spread_add_legacy(sensorhub, sensor_mask,
+ current_timestamp,
+ last_out);
+
+ring_handler_end:
+ sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] = current_timestamp;
+ return;
+
+error:
+ mutex_unlock(&sensorhub->cmd_lock);
+}
+
+static int cros_ec_sensorhub_event(struct notifier_block *nb,
+ unsigned long queued_during_suspend,
+ void *_notify)
+{
+ struct cros_ec_sensorhub *sensorhub;
+ struct cros_ec_device *ec_dev;
+
+ sensorhub = container_of(nb, struct cros_ec_sensorhub, notifier);
+ ec_dev = sensorhub->ec->ec_dev;
+
+ if (ec_dev->event_data.event_type != EC_MKBP_EVENT_SENSOR_FIFO)
+ return NOTIFY_DONE;
+
+ if (ec_dev->event_size != sizeof(ec_dev->event_data.data.sensor_fifo)) {
+ dev_warn(ec_dev->dev, "Invalid fifo info size\n");
+ return NOTIFY_DONE;
+ }
+
+ if (queued_during_suspend)
+ return NOTIFY_OK;
+
+ memcpy(sensorhub->fifo_info, &ec_dev->event_data.data.sensor_fifo.info,
+ sizeof(*sensorhub->fifo_info));
+ sensorhub->fifo_timestamp[CROS_EC_SENSOR_NEW_TS] =
+ ec_dev->last_event_time;
+ cros_ec_sensorhub_ring_handler(sensorhub);
+
+ return NOTIFY_OK;
+}
+
+/**
+ * cros_ec_sensorhub_ring_add() - Add the FIFO functionality if the EC
+ * supports it.
+ *
+ * @sensorhub : Sensor Hub object.
+ *
+ * Return: 0 on success.
+ */
+int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub)
+{
+ struct cros_ec_dev *ec = sensorhub->ec;
+ int ret;
+ int fifo_info_length =
+ sizeof(struct ec_response_motion_sense_fifo_info) +
+ sizeof(u16) * sensorhub->sensor_num;
+
+ /* Allocate the array for lost events. */
+ sensorhub->fifo_info = devm_kzalloc(sensorhub->dev, fifo_info_length,
+ GFP_KERNEL);
+ if (!sensorhub->fifo_info)
+ return -ENOMEM;
+
+ /* Retrieve FIFO information */
+ sensorhub->msg->version = 2;
+ sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
+ sensorhub->msg->outsize = 1;
+ sensorhub->msg->insize = fifo_info_length;
+
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Allocate the full fifo. We need to copy the whole FIFO to set
+ * timestamps properly.
+ */
+ sensorhub->fifo_size = sensorhub->resp->fifo_info.size;
+ sensorhub->ring = devm_kcalloc(sensorhub->dev, sensorhub->fifo_size,
+ sizeof(*sensorhub->ring), GFP_KERNEL);
+ if (!sensorhub->ring)
+ return -ENOMEM;
+
+ /*
+ * Allocate the callback area based on the number of sensors.
+ */
+ sensorhub->push_data = devm_kcalloc(
+ sensorhub->dev, sensorhub->sensor_num,
+ sizeof(*sensorhub->push_data),
+ GFP_KERNEL);
+ if (!sensorhub->push_data)
+ return -ENOMEM;
+
+ sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] =
+ cros_ec_get_time_ns();
+
+ sensorhub->tight_timestamps = cros_ec_check_features(
+ ec, EC_FEATURE_MOTION_SENSE_TIGHT_TIMESTAMPS);
+
+ if (sensorhub->tight_timestamps) {
+ sensorhub->batch_state = devm_kcalloc(sensorhub->dev,
+ sensorhub->sensor_num,
+ sizeof(*sensorhub->batch_state),
+ GFP_KERNEL);
+ if (!sensorhub->batch_state)
+ return -ENOMEM;
+ }
+
+ /* Register the notifier that will act as a top half interrupt. */
+ sensorhub->notifier.notifier_call = cros_ec_sensorhub_event;
+ ret = blocking_notifier_chain_register(&ec->ec_dev->event_notifier,
+ &sensorhub->notifier);
+ if (ret < 0)
+ return ret;
+
+ /* Start collection samples. */
+ return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
+}
+
+void cros_ec_sensorhub_ring_remove(void *arg)
+{
+ struct cros_ec_sensorhub *sensorhub = arg;
+ struct cros_ec_device *ec_dev = sensorhub->ec->ec_dev;
+
+ /* Disable the ring, prevent EC interrupt to the AP for nothing. */
+ cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
+ blocking_notifier_chain_unregister(&ec_dev->event_notifier,
+ &sensorhub->notifier);
+}
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 46786d2d679a..debea5c4c829 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -127,7 +127,8 @@ static int terminate_request(struct cros_ec_device *ec_dev)
*/
spi_message_init(&msg);
memset(&trans, 0, sizeof(trans));
- trans.delay_usecs = ec_spi->end_of_msg_delay;
+ trans.delay.value = ec_spi->end_of_msg_delay;
+ trans.delay.unit = SPI_DELAY_UNIT_USECS;
spi_message_add_tail(&trans, &msg);
ret = spi_sync_locked(ec_spi->spi, &msg);
@@ -416,7 +417,8 @@ static int do_cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev,
spi_message_init(&msg);
if (ec_spi->start_of_msg_delay) {
memset(&trans_delay, 0, sizeof(trans_delay));
- trans_delay.delay_usecs = ec_spi->start_of_msg_delay;
+ trans_delay.delay.value = ec_spi->start_of_msg_delay;
+ trans_delay.delay.unit = SPI_DELAY_UNIT_USECS;
spi_message_add_tail(&trans_delay, &msg);
}
diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 07dac97ad57c..d45ea5d5bfa4 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -149,14 +149,14 @@ static ssize_t version_show(struct device *dev,
/* Get build info. */
msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
msg->insize = EC_HOST_PARAM_SIZE;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0)
- count += scnprintf(buf + count, PAGE_SIZE - count,
- "Build info: XFER ERROR %d\n", ret);
- else if (msg->result != EC_RES_SUCCESS)
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret == -EPROTO) {
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: EC error %d\n", msg->result);
- else {
+ } else if (ret < 0) {
+ count += scnprintf(buf + count, PAGE_SIZE - count,
+ "Build info: XFER ERROR %d\n", ret);
+ } else {
msg->data[EC_HOST_PARAM_SIZE - 1] = '\0';
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: %s\n", msg->data);
@@ -165,14 +165,14 @@ static ssize_t version_show(struct device *dev,
/* Get chip info. */
msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
msg->insize = sizeof(*r_chip);
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0)
- count += scnprintf(buf + count, PAGE_SIZE - count,
- "Chip info: XFER ERROR %d\n", ret);
- else if (msg->result != EC_RES_SUCCESS)
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret == -EPROTO) {
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: EC error %d\n", msg->result);
- else {
+ } else if (ret < 0) {
+ count += scnprintf(buf + count, PAGE_SIZE - count,
+ "Chip info: XFER ERROR %d\n", ret);
+ } else {
r_chip = (struct ec_response_get_chip_info *)msg->data;
r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
@@ -189,14 +189,14 @@ static ssize_t version_show(struct device *dev,
/* Get board version */
msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
msg->insize = sizeof(*r_board);
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0)
- count += scnprintf(buf + count, PAGE_SIZE - count,
- "Board version: XFER ERROR %d\n", ret);
- else if (msg->result != EC_RES_SUCCESS)
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret == -EPROTO) {
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: EC error %d\n", msg->result);
- else {
+ } else if (ret < 0) {
+ count += scnprintf(buf + count, PAGE_SIZE - count,
+ "Board version: XFER ERROR %d\n", ret);
+ } else {
r_board = (struct ec_response_board_version *)msg->data;
count += scnprintf(buf + count, PAGE_SIZE - count,
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
new file mode 100644
index 000000000000..874269c07073
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2020 Google LLC
+ *
+ * This driver provides the ability to view and manage Type C ports through the
+ * Chrome OS EC.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_device.h>
+#include <linux/usb/typec.h>
+
+#define DRV_NAME "cros-ec-typec"
+
+/* Platform-specific data for the Chrome OS EC Type C controller. */
+struct cros_typec_data {
+ struct device *dev;
+ struct cros_ec_device *ec;
+ int num_ports;
+ unsigned int cmd_ver;
+ /* Array of ports, indexed by port number. */
+ struct typec_port *ports[EC_USB_PD_MAX_PORTS];
+ /* Initial capabilities for each port. */
+ struct typec_capability *caps[EC_USB_PD_MAX_PORTS];
+};
+
+static int cros_typec_parse_port_props(struct typec_capability *cap,
+ struct fwnode_handle *fwnode,
+ struct device *dev)
+{
+ const char *buf;
+ int ret;
+
+ memset(cap, 0, sizeof(*cap));
+ ret = fwnode_property_read_string(fwnode, "power-role", &buf);
+ if (ret) {
+ dev_err(dev, "power-role not found: %d\n", ret);
+ return ret;
+ }
+
+ ret = typec_find_port_power_role(buf);
+ if (ret < 0)
+ return ret;
+ cap->type = ret;
+
+ ret = fwnode_property_read_string(fwnode, "data-role", &buf);
+ if (ret) {
+ dev_err(dev, "data-role not found: %d\n", ret);
+ return ret;
+ }
+
+ ret = typec_find_port_data_role(buf);
+ if (ret < 0)
+ return ret;
+ cap->data = ret;
+
+ ret = fwnode_property_read_string(fwnode, "try-power-role", &buf);
+ if (ret) {
+ dev_err(dev, "try-power-role not found: %d\n", ret);
+ return ret;
+ }
+
+ ret = typec_find_power_role(buf);
+ if (ret < 0)
+ return ret;
+ cap->prefer_role = ret;
+
+ cap->fwnode = fwnode;
+
+ return 0;
+}
+
+static int cros_typec_init_ports(struct cros_typec_data *typec)
+{
+ struct device *dev = typec->dev;
+ struct typec_capability *cap;
+ struct fwnode_handle *fwnode;
+ const char *port_prop;
+ int ret;
+ int i;
+ int nports;
+ u32 port_num = 0;
+
+ nports = device_get_child_node_count(dev);
+ if (nports == 0) {
+ dev_err(dev, "No port entries found.\n");
+ return -ENODEV;
+ }
+
+ if (nports > typec->num_ports) {
+ dev_err(dev, "More ports listed than can be supported.\n");
+ return -EINVAL;
+ }
+
+ /* DT uses "reg" to specify port number. */
+ port_prop = dev->of_node ? "reg" : "port-number";
+ device_for_each_child_node(dev, fwnode) {
+ if (fwnode_property_read_u32(fwnode, port_prop, &port_num)) {
+ ret = -EINVAL;
+ dev_err(dev, "No port-number for port, aborting.\n");
+ goto unregister_ports;
+ }
+
+ if (port_num >= typec->num_ports) {
+ dev_err(dev, "Invalid port number.\n");
+ ret = -EINVAL;
+ goto unregister_ports;
+ }
+
+ dev_dbg(dev, "Registering port %d\n", port_num);
+
+ cap = devm_kzalloc(dev, sizeof(*cap), GFP_KERNEL);
+ if (!cap) {
+ ret = -ENOMEM;
+ goto unregister_ports;
+ }
+
+ typec->caps[port_num] = cap;
+
+ ret = cros_typec_parse_port_props(cap, fwnode, dev);
+ if (ret < 0)
+ goto unregister_ports;
+
+ typec->ports[port_num] = typec_register_port(dev, cap);
+ if (IS_ERR(typec->ports[port_num])) {
+ dev_err(dev, "Failed to register port %d\n", port_num);
+ ret = PTR_ERR(typec->ports[port_num]);
+ goto unregister_ports;
+ }
+ }
+
+ return 0;
+
+unregister_ports:
+ for (i = 0; i < typec->num_ports; i++)
+ typec_unregister_port(typec->ports[i]);
+ return ret;
+}
+
+static int cros_typec_ec_command(struct cros_typec_data *typec,
+ unsigned int version,
+ unsigned int command,
+ void *outdata,
+ unsigned int outsize,
+ void *indata,
+ unsigned int insize)
+{
+ struct cros_ec_command *msg;
+ int ret;
+
+ msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->version = version;
+ msg->command = command;
+ msg->outsize = outsize;
+ msg->insize = insize;
+
+ if (outsize)
+ memcpy(msg->data, outdata, outsize);
+
+ ret = cros_ec_cmd_xfer_status(typec->ec, msg);
+ if (ret >= 0 && insize)
+ memcpy(indata, msg->data, insize);
+
+ kfree(msg);
+ return ret;
+}
+
+static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
+ int port_num, struct ec_response_usb_pd_control *resp)
+{
+ struct typec_port *port = typec->ports[port_num];
+ enum typec_orientation polarity;
+
+ if (!resp->enabled)
+ polarity = TYPEC_ORIENTATION_NONE;
+ else if (!resp->polarity)
+ polarity = TYPEC_ORIENTATION_NORMAL;
+ else
+ polarity = TYPEC_ORIENTATION_REVERSE;
+
+ typec_set_pwr_role(port, resp->role ? TYPEC_SOURCE : TYPEC_SINK);
+ typec_set_orientation(port, polarity);
+}
+
+static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
+ int port_num, struct ec_response_usb_pd_control_v1 *resp)
+{
+ struct typec_port *port = typec->ports[port_num];
+ enum typec_orientation polarity;
+
+ if (!(resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
+ polarity = TYPEC_ORIENTATION_NONE;
+ else if (!resp->polarity)
+ polarity = TYPEC_ORIENTATION_NORMAL;
+ else
+ polarity = TYPEC_ORIENTATION_REVERSE;
+ typec_set_orientation(port, polarity);
+ typec_set_data_role(port, resp->role & PD_CTRL_RESP_ROLE_DATA ?
+ TYPEC_HOST : TYPEC_DEVICE);
+ typec_set_pwr_role(port, resp->role & PD_CTRL_RESP_ROLE_POWER ?
+ TYPEC_SOURCE : TYPEC_SINK);
+ typec_set_vconn_role(port, resp->role & PD_CTRL_RESP_ROLE_VCONN ?
+ TYPEC_SOURCE : TYPEC_SINK);
+}
+
+static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
+{
+ struct ec_params_usb_pd_control req;
+ struct ec_response_usb_pd_control_v1 resp;
+ int ret;
+
+ if (port_num < 0 || port_num >= typec->num_ports) {
+ dev_err(typec->dev, "cannot get status for invalid port %d\n",
+ port_num);
+ return -EINVAL;
+ }
+
+ req.port = port_num;
+ req.role = USB_PD_CTRL_ROLE_NO_CHANGE;
+ req.mux = USB_PD_CTRL_MUX_NO_CHANGE;
+ req.swap = USB_PD_CTRL_SWAP_NONE;
+
+ ret = cros_typec_ec_command(typec, typec->cmd_ver,
+ EC_CMD_USB_PD_CONTROL, &req, sizeof(req),
+ &resp, sizeof(resp));
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(typec->dev, "Enabled %d: 0x%hhx\n", port_num, resp.enabled);
+ dev_dbg(typec->dev, "Role %d: 0x%hhx\n", port_num, resp.role);
+ dev_dbg(typec->dev, "Polarity %d: 0x%hhx\n", port_num, resp.polarity);
+ dev_dbg(typec->dev, "State %d: %s\n", port_num, resp.state);
+
+ if (typec->cmd_ver == 1)
+ cros_typec_set_port_params_v1(typec, port_num, &resp);
+ else
+ cros_typec_set_port_params_v0(typec, port_num,
+ (struct ec_response_usb_pd_control *) &resp);
+
+ return 0;
+}
+
+static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
+{
+ struct ec_params_get_cmd_versions_v1 req_v1;
+ struct ec_response_get_cmd_versions resp;
+ int ret;
+
+ /* We're interested in the PD control command version. */
+ req_v1.cmd = EC_CMD_USB_PD_CONTROL;
+ ret = cros_typec_ec_command(typec, 1, EC_CMD_GET_CMD_VERSIONS,
+ &req_v1, sizeof(req_v1), &resp,
+ sizeof(resp));
+ if (ret < 0)
+ return ret;
+
+ if (resp.version_mask & EC_VER_MASK(1))
+ typec->cmd_ver = 1;
+ else
+ typec->cmd_ver = 0;
+
+ dev_dbg(typec->dev, "PD Control has version mask 0x%hhx\n",
+ typec->cmd_ver);
+
+ return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cros_typec_acpi_id[] = {
+ { "GOOG0014", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, cros_typec_acpi_id);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id cros_typec_of_match[] = {
+ { .compatible = "google,cros-ec-typec", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, cros_typec_of_match);
+#endif
+
+static int cros_typec_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_typec_data *typec;
+ struct ec_response_usb_pd_ports resp;
+ int ret, i;
+
+ typec = devm_kzalloc(dev, sizeof(*typec), GFP_KERNEL);
+ if (!typec)
+ return -ENOMEM;
+
+ typec->dev = dev;
+ typec->ec = dev_get_drvdata(pdev->dev.parent);
+ platform_set_drvdata(pdev, typec);
+
+ ret = cros_typec_get_cmd_version(typec);
+ if (ret < 0) {
+ dev_err(dev, "failed to get PD command version info\n");
+ return ret;
+ }
+
+ ret = cros_typec_ec_command(typec, 0, EC_CMD_USB_PD_PORTS, NULL, 0,
+ &resp, sizeof(resp));
+ if (ret < 0)
+ return ret;
+
+ typec->num_ports = resp.num_ports;
+ if (typec->num_ports > EC_USB_PD_MAX_PORTS) {
+ dev_warn(typec->dev,
+ "Too many ports reported: %d, limiting to max: %d\n",
+ typec->num_ports, EC_USB_PD_MAX_PORTS);
+ typec->num_ports = EC_USB_PD_MAX_PORTS;
+ }
+
+ ret = cros_typec_init_ports(typec);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < typec->num_ports; i++) {
+ ret = cros_typec_port_update(typec, i);
+ if (ret < 0)
+ goto unregister_ports;
+ }
+
+ return 0;
+
+unregister_ports:
+ for (i = 0; i < typec->num_ports; i++)
+ if (typec->ports[i])
+ typec_unregister_port(typec->ports[i]);
+ return ret;
+}
+
+static struct platform_driver cros_typec_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .acpi_match_table = ACPI_PTR(cros_typec_acpi_id),
+ .of_match_table = of_match_ptr(cros_typec_of_match),
+ },
+ .probe = cros_typec_probe,
+};
+
+module_platform_driver(cros_typec_driver);
+
+MODULE_AUTHOR("Prashant Malani <pmalani@chromium.org>");
+MODULE_DESCRIPTION("Chrome OS EC Type C control");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
index 8edae465105c..46482d12cffe 100644
--- a/drivers/platform/chrome/cros_ec_vbc.c
+++ b/drivers/platform/chrome/cros_ec_vbc.c
@@ -40,7 +40,7 @@ static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
msg->outsize = para_sz;
msg->insize = resp_sz;
- err = cros_ec_cmd_xfer(ecdev, msg);
+ err = cros_ec_cmd_xfer_status(ecdev, msg);
if (err < 0) {
dev_err(dev, "Error sending read request: %d\n", err);
kfree(msg);
@@ -83,7 +83,7 @@ static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
msg->outsize = para_sz;
msg->insize = 0;
- err = cros_ec_cmd_xfer(ecdev, msg);
+ err = cros_ec_cmd_xfer_status(ecdev, msg);
if (err < 0) {
dev_err(dev, "Error sending write request: %d\n", err);
kfree(msg);
diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
new file mode 100644
index 000000000000..7f36142ab12a
--- /dev/null
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2020 Google LLC
+ *
+ * This driver serves as the receiver of cros_ec PD host events.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_usbpd_notify.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "cros-usbpd-notify"
+#define DRV_NAME_PLAT_ACPI "cros-usbpd-notify-acpi"
+#define ACPI_DRV_NAME "GOOG0003"
+
+static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list);
+
+struct cros_usbpd_notify_data {
+ struct device *dev;
+ struct cros_ec_device *ec;
+ struct notifier_block nb;
+};
+
+/**
+ * cros_usbpd_register_notify - Register a notifier callback for PD events.
+ * @nb: Notifier block pointer to register
+ *
+ * On ACPI platforms this corresponds to host events on the ECPD
+ * "GOOG0003" ACPI device. On non-ACPI platforms this will filter mkbp events
+ * for USB PD events.
+ *
+ * Return: 0 on success or negative error code.
+ */
+int cros_usbpd_register_notify(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&cros_usbpd_notifier_list,
+ nb);
+}
+EXPORT_SYMBOL_GPL(cros_usbpd_register_notify);
+
+/**
+ * cros_usbpd_unregister_notify - Unregister notifier callback for PD events.
+ * @nb: Notifier block pointer to unregister
+ *
+ * Unregister a notifier callback that was previously registered with
+ * cros_usbpd_register_notify().
+ */
+void cros_usbpd_unregister_notify(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&cros_usbpd_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify);
+
+/**
+ * cros_ec_pd_command - Send a command to the EC.
+ *
+ * @ec_dev: EC device
+ * @command: EC command
+ * @outdata: EC command output data
+ * @outsize: Size of outdata
+ * @indata: EC command input data
+ * @insize: Size of indata
+ *
+ * Return: >= 0 on success, negative error number on failure.
+ */
+static int cros_ec_pd_command(struct cros_ec_device *ec_dev,
+ int command,
+ uint8_t *outdata,
+ int outsize,
+ uint8_t *indata,
+ int insize)
+{
+ struct cros_ec_command *msg;
+ int ret;
+
+ msg = kzalloc(sizeof(*msg) + max(insize, outsize), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->command = command;
+ msg->outsize = outsize;
+ msg->insize = insize;
+
+ if (outsize)
+ memcpy(msg->data, outdata, outsize);
+
+ ret = cros_ec_cmd_xfer_status(ec_dev, msg);
+ if (ret < 0)
+ goto error;
+
+ if (insize)
+ memcpy(indata, msg->data, insize);
+error:
+ kfree(msg);
+ return ret;
+}
+
+static void cros_usbpd_get_event_and_notify(struct device *dev,
+ struct cros_ec_device *ec_dev)
+{
+ struct ec_response_host_event_status host_event_status;
+ u32 event = 0;
+ int ret;
+
+ /*
+ * We still send a 0 event out to older devices which don't
+ * have the updated device heirarchy.
+ */
+ if (!ec_dev) {
+ dev_dbg(dev,
+ "EC device inaccessible; sending 0 event status.\n");
+ goto send_notify;
+ }
+
+ /* Check for PD host events on EC. */
+ ret = cros_ec_pd_command(ec_dev, EC_CMD_PD_HOST_EVENT_STATUS,
+ NULL, 0,
+ (uint8_t *)&host_event_status,
+ sizeof(host_event_status));
+ if (ret < 0) {
+ dev_warn(dev, "Can't get host event status (err: %d)\n", ret);
+ goto send_notify;
+ }
+
+ event = host_event_status.status;
+
+send_notify:
+ blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
+}
+
+#ifdef CONFIG_ACPI
+
+static void cros_usbpd_notify_acpi(acpi_handle device, u32 event, void *data)
+{
+ struct cros_usbpd_notify_data *pdnotify = data;
+
+ cros_usbpd_get_event_and_notify(pdnotify->dev, pdnotify->ec);
+}
+
+static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
+{
+ struct cros_usbpd_notify_data *pdnotify;
+ struct device *dev = &pdev->dev;
+ struct acpi_device *adev;
+ struct cros_ec_device *ec_dev;
+ acpi_status status;
+
+ adev = ACPI_COMPANION(dev);
+
+ pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
+ if (!pdnotify)
+ return -ENOMEM;
+
+ /* Get the EC device pointer needed to talk to the EC. */
+ ec_dev = dev_get_drvdata(dev->parent);
+ if (!ec_dev) {
+ /*
+ * We continue even for older devices which don't have the
+ * correct device heirarchy, namely, GOOG0003 is a child
+ * of GOOG0004.
+ */
+ dev_warn(dev, "Couldn't get Chrome EC device pointer.\n");
+ }
+
+ pdnotify->dev = dev;
+ pdnotify->ec = ec_dev;
+
+ status = acpi_install_notify_handler(adev->handle,
+ ACPI_ALL_NOTIFY,
+ cros_usbpd_notify_acpi,
+ pdnotify);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(dev, "Failed to register notify handler %08x\n",
+ status);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int cros_usbpd_notify_remove_acpi(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+
+ acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
+ cros_usbpd_notify_acpi);
+
+ return 0;
+}
+
+static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = {
+ { ACPI_DRV_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, cros_usbpd_notify_acpi_device_ids);
+
+static struct platform_driver cros_usbpd_notify_acpi_driver = {
+ .driver = {
+ .name = DRV_NAME_PLAT_ACPI,
+ .acpi_match_table = cros_usbpd_notify_acpi_device_ids,
+ },
+ .probe = cros_usbpd_notify_probe_acpi,
+ .remove = cros_usbpd_notify_remove_acpi,
+};
+
+#endif /* CONFIG_ACPI */
+
+static int cros_usbpd_notify_plat(struct notifier_block *nb,
+ unsigned long queued_during_suspend,
+ void *data)
+{
+ struct cros_usbpd_notify_data *pdnotify = container_of(nb,
+ struct cros_usbpd_notify_data, nb);
+ struct cros_ec_device *ec_dev = (struct cros_ec_device *)data;
+ u32 host_event = cros_ec_get_host_event(ec_dev);
+
+ if (!host_event)
+ return NOTIFY_DONE;
+
+ if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
+ cros_usbpd_get_event_and_notify(pdnotify->dev, ec_dev);
+ return NOTIFY_OK;
+ }
+ return NOTIFY_DONE;
+}
+
+static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
+ struct cros_usbpd_notify_data *pdnotify;
+ int ret;
+
+ pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
+ if (!pdnotify)
+ return -ENOMEM;
+
+ pdnotify->dev = dev;
+ pdnotify->ec = ecdev->ec_dev;
+ pdnotify->nb.notifier_call = cros_usbpd_notify_plat;
+
+ dev_set_drvdata(dev, pdnotify);
+
+ ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier,
+ &pdnotify->nb);
+ if (ret < 0) {
+ dev_err(dev, "Failed to register notifier\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
+ struct cros_usbpd_notify_data *pdnotify =
+ (struct cros_usbpd_notify_data *)dev_get_drvdata(dev);
+
+ blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier,
+ &pdnotify->nb);
+
+ return 0;
+}
+
+static struct platform_driver cros_usbpd_notify_plat_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = cros_usbpd_notify_probe_plat,
+ .remove = cros_usbpd_notify_remove_plat,
+};
+
+static int __init cros_usbpd_notify_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&cros_usbpd_notify_plat_driver);
+ if (ret < 0)
+ return ret;
+
+#ifdef CONFIG_ACPI
+ platform_driver_register(&cros_usbpd_notify_acpi_driver);
+#endif
+ return 0;
+}
+
+static void __exit cros_usbpd_notify_exit(void)
+{
+#ifdef CONFIG_ACPI
+ platform_driver_unregister(&cros_usbpd_notify_acpi_driver);
+#endif
+ platform_driver_unregister(&cros_usbpd_notify_plat_driver);
+}
+
+module_init(cros_usbpd_notify_init);
+module_exit(cros_usbpd_notify_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ChromeOS power delivery notifier device");
+MODULE_AUTHOR("Jon Flatley <jflat@chromium.org>");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c
index dba3d445623f..814518509739 100644
--- a/drivers/platform/chrome/wilco_ec/event.c
+++ b/drivers/platform/chrome/wilco_ec/event.c
@@ -79,7 +79,7 @@ static DEFINE_IDA(event_ida);
struct ec_event {
u16 size;
u16 type;
- u16 event[0];
+ u16 event[];
} __packed;
#define ec_event_num_words(ev) (ev->size - 1)
@@ -96,7 +96,7 @@ struct ec_event_queue {
int capacity;
int head;
int tail;
- struct ec_event *entries[0];
+ struct ec_event *entries[];
};
/* Maximum number of events to store in ec_event_queue */
diff --git a/drivers/platform/chrome/wilco_ec/properties.c b/drivers/platform/chrome/wilco_ec/properties.c
index 62f27610dd33..c2bf4c95c5d2 100644
--- a/drivers/platform/chrome/wilco_ec/properties.c
+++ b/drivers/platform/chrome/wilco_ec/properties.c
@@ -3,8 +3,11 @@
* Copyright 2019 Google LLC
*/
+#include <linux/errno.h>
+#include <linux/export.h>
#include <linux/platform_data/wilco-ec.h>
#include <linux/string.h>
+#include <linux/types.h>
#include <asm/unaligned.h>
/* Operation code; what the EC should do with the property */
diff --git a/drivers/platform/chrome/wilco_ec/sysfs.c b/drivers/platform/chrome/wilco_ec/sysfs.c
index f0d174b6bb21..3c587b4054a5 100644
--- a/drivers/platform/chrome/wilco_ec/sysfs.c
+++ b/drivers/platform/chrome/wilco_ec/sysfs.c
@@ -8,8 +8,12 @@
* See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
*/
+#include <linux/device.h>
+#include <linux/kernel.h>
#include <linux/platform_data/wilco-ec.h>
+#include <linux/string.h>
#include <linux/sysfs.h>
+#include <linux/types.h>
#define CMD_KB_CMOS 0x7C
#define SUB_CMD_KB_CMOS_AUTO_ON 0x03
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 02:39:15 +0000