Implementation of a UCSI transport driver for ChromeOS.
This driver will be loaded if the ChromeOS EC implements a PPM.
Signed-off-by: Pavan Holla <pholla@xxxxxxxxxxxx>
---
drivers/usb/typec/ucsi/Kconfig | 13 ++
drivers/usb/typec/ucsi/Makefile | 1 +
drivers/usb/typec/ucsi/cros_ec_ucsi.c | 245 ++++++++++++++++++++++++++++++++++
3 files changed, 259 insertions(+)
diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig
index bdcb1764cfae..4dceb14a66ee 100644
--- a/drivers/usb/typec/ucsi/Kconfig
+++ b/drivers/usb/typec/ucsi/Kconfig
@@ -69,4 +69,17 @@ config UCSI_PMIC_GLINK
To compile the driver as a module, choose M here: the module will be
called ucsi_glink.
+config CROS_EC_UCSI
+ tristate "UCSI Driver for ChromeOS EC"
+ depends on MFD_CROS_EC_DEV
+ depends on CROS_USBPD_NOTIFY
+ depends on !EXTCON_TCSS_CROS_EC
+ default MFD_CROS_EC_DEV
+ help
+ This driver enables UCSI support for a ChromeOS EC. The EC is
+ expected to implement a PPM.
+
+ To compile the driver as a module, choose M here: the module
+ will be called cros_ec_ucsi.
+
endif
diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile
index b4679f94696b..cb336eee055c 100644
--- a/drivers/usb/typec/ucsi/Makefile
+++ b/drivers/usb/typec/ucsi/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o
obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o
obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o
obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o
+obj-$(CONFIG_CROS_EC_UCSI) += cros_ec_ucsi.o
diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c
new file mode 100644
index 000000000000..dd46b46d430f
--- /dev/null
+++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * UCSI driver for ChromeOS EC
+ *
+ * Copyright 2024 Google LLC.
+ */
+
+#include <linux/container_of.h>
+#include <linux/dev_printk.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_usbpd_notify.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+
+#include "ucsi.h"
+
+#define DRV_NAME "cros-ec-ucsi"
+
+#define MAX_EC_DATA_SIZE 256
+#define WRITE_TMO_MS 500
+
+struct cros_ucsi_data {
+ struct device *dev;
+ struct ucsi *ucsi;
+
+ struct cros_ec_device *ec;
+ struct notifier_block nb;
+ struct work_struct work;
+
+ struct completion complete;
+ unsigned long flags;
+};
+
+static int cros_ucsi_read(struct ucsi *ucsi, unsigned int offset, void *val,
+ size_t val_len)
+{
+ struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi);
+ struct ec_params_ucsi_ppm_get req = {
+ .offset = offset,
+ .size = val_len,
+ };
+ int ret;
+
+ if (val_len > MAX_EC_DATA_SIZE) {
+ dev_err(udata->dev, "Can't read %zu bytes. Too big.", val_len);
+ return -EINVAL;
+ }
+
+ ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_GET,
+ &req, sizeof(req), val, val_len);
+ if (ret < 0) {
+ dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_GET: error=%d", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static int cros_ucsi_async_write(struct ucsi *ucsi, unsigned int offset,
+ const void *val, size_t val_len)
+{
+ struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi);
+ uint8_t ec_buffer[MAX_EC_DATA_SIZE + sizeof(struct ec_params_ucsi_ppm_set)];
+ struct ec_params_ucsi_ppm_set *req = (struct ec_params_ucsi_ppm_set *)ec_buffer;
+ int ret = 0;
+
+ if (val_len > MAX_EC_DATA_SIZE) {
+ dev_err(udata->dev, "Can't write %zu bytes. Too big.", val_len);
+ return -EINVAL;
+ }
+
+ memset(req, 0, sizeof(ec_buffer));
+ req->offset = offset;
+ memcpy(req->data, val, val_len);
+ ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_SET,
+ req, sizeof(struct ec_params_ucsi_ppm_set) + val_len, NULL, 0);
+
+ if (ret < 0) {
+ dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_SET: error=%d", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static int cros_ucsi_sync_write(struct ucsi *ucsi, unsigned int offset,
+ const void *val, size_t val_len)
+{
+ struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi);
+ bool ack = UCSI_COMMAND(*(u64 *)val) == UCSI_ACK_CC_CI;
+ int ret;
+
+ if (ack)
+ set_bit(ACK_PENDING, &udata->flags);
+ else
+ set_bit(COMMAND_PENDING, &udata->flags);
+
+ ret = cros_ucsi_async_write(ucsi, offset, val, val_len);
+ if (ret)
+ goto out;
+
+ if (!wait_for_completion_timeout(&udata->complete, WRITE_TMO_MS))
+ ret = -ETIMEDOUT;
+
+out:
+ if (ack)
+ clear_bit(ACK_PENDING, &udata->flags);
+ else
+ clear_bit(COMMAND_PENDING, &udata->flags);
+ return ret;
+}
+
+struct ucsi_operations cros_ucsi_ops = {
+ .read = cros_ucsi_read,
+ .async_write = cros_ucsi_async_write,
+ .sync_write = cros_ucsi_sync_write,
+};
+
+static void cros_ucsi_work(struct work_struct *work)
+{
+ struct cros_ucsi_data *udata = container_of(work, struct cros_ucsi_data, work);
+ u32 cci;
+ int ret;
+
+ ret = cros_ucsi_read(udata->ucsi, UCSI_CCI, &cci, sizeof(cci));
+ if (ret)
+ return;
+
+ if (UCSI_CCI_CONNECTOR(cci))
+ ucsi_connector_change(udata->ucsi, UCSI_CCI_CONNECTOR(cci));
+
+ if (cci & UCSI_CCI_ACK_COMPLETE && test_bit(ACK_PENDING, &udata->flags))
+ complete(&udata->complete);
+ if (cci & UCSI_CCI_COMMAND_COMPLETE &&
+ test_bit(COMMAND_PENDING, &udata->flags))
+ complete(&udata->complete);
+}
+
+static int cros_ucsi_event(struct notifier_block *nb,
+ unsigned long host_event, void *_notify)
+{
+ struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb);
+
+ if (!(host_event & PD_EVENT_PPM))
+ return NOTIFY_OK;
+
+ dev_dbg(udata->dev, "UCSI notification received");
+ flush_work(&udata->work);
+ schedule_work(&udata->work);
+
+ return NOTIFY_OK;
+}
+
+static int cros_ucsi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_ec_dev *ec_data = dev_get_drvdata(dev->parent);
+ struct cros_ucsi_data *udata;
+ int ret;
+
+ udata = devm_kzalloc(dev, sizeof(*udata), GFP_KERNEL);
+ if (!udata)
+ return -ENOMEM;
+
+ udata->dev = dev;
+
+ udata->ec = ec_data->ec_dev;
+ if (!udata->ec) {
+ dev_err(dev, "couldn't find parent EC device\n");
+ return -ENODEV;
+ }
+
+ platform_set_drvdata(pdev, udata);
+
+ INIT_WORK(&udata->work, cros_ucsi_work);
+ init_completion(&udata->complete);
+
+ udata->ucsi = ucsi_create(udata->dev, &cros_ucsi_ops);
+ if (IS_ERR(udata->ucsi)) {
+ dev_err(dev, "failed to allocate UCSI instance\n");
+ return PTR_ERR(udata->ucsi);
+ }
+
+ ucsi_set_drvdata(udata->ucsi, udata);
+
+ ret = ucsi_register(udata->ucsi);
+ if (ret) {
+ ucsi_destroy(udata->ucsi);
+ return ret;
+ }
+
+ udata->nb.notifier_call = cros_ucsi_event;
+ return cros_usbpd_register_notify(&udata->nb);
+}
+
+static int cros_ucsi_remove(struct platform_device *dev)
+{
+ struct cros_ucsi_data *udata = platform_get_drvdata(dev);
+
+ ucsi_unregister(udata->ucsi);
+ ucsi_destroy(udata->ucsi);
+ return 0;
+}
+
+static int __maybe_unused cros_ucsi_suspend(struct device *dev)
+{
+ struct cros_ucsi_data *udata = dev_get_drvdata(dev);
+
+ cancel_work_sync(&udata->work);
+
+ return 0;
+}
+
+static int __maybe_unused cros_ucsi_resume(struct device *dev)
+{
+ struct cros_ucsi_data *udata = dev_get_drvdata(dev);
+
+ return ucsi_resume(udata->ucsi);
+}
+
+static SIMPLE_DEV_PM_OPS(cros_ucsi_pm_ops, cros_ucsi_suspend,
+ cros_ucsi_resume);
+
+static const struct platform_device_id cros_ec_ucsi_id[] = {
+ { "cros-ec-ucsi"},
+ {}
+};
+MODULE_DEVICE_TABLE(platform, cros_ec_ucsi_id);
+
+static struct platform_driver cros_ucsi_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .pm = &cros_ucsi_pm_ops,
+ },
+ .id_table = cros_ec_ucsi_id,
+ .probe = cros_ucsi_probe,
+ .remove = cros_ucsi_remove,
+};
+
+module_platform_driver(cros_ucsi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("UCSI driver for ChromeOS EC");
--
2.44.0.478.gd926399ef9-goog
