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@@ -0,0 +1,790 @@
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+/*
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+ * USB Type-C Connector System Software Interface driver
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+ *
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+ * Copyright (C) 2017, Intel Corporation
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+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/completion.h>
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+#include <linux/property.h>
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+#include <linux/device.h>
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+#include <linux/module.h>
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+#include <linux/delay.h>
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+#include <linux/slab.h>
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+#include <linux/usb/typec.h>
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+
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+#include "ucsi.h"
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+#include "trace.h"
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+
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+#define to_ucsi_connector(_cap_) container_of(_cap_, struct ucsi_connector, \
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+ typec_cap)
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+
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+/*
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+ * UCSI_TIMEOUT_MS - PPM communication timeout
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+ *
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+ * Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI
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+ * specification) here as reference, but unfortunately we can't. It is very
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+ * difficult to estimate the time it takes for the system to process the command
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+ * before it is actually passed to the PPM.
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+ */
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+#define UCSI_TIMEOUT_MS 1000
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+
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+/*
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+ * UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests
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+ *
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+ * 5 seconds is close to the time it takes for CapsCounter to reach 0, so even
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+ * if the PPM does not generate Connector Change events before that with
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+ * partners that do not support USB Power Delivery, this should still work.
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+ */
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+#define UCSI_SWAP_TIMEOUT_MS 5000
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+
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+enum ucsi_status {
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+ UCSI_IDLE = 0,
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+ UCSI_BUSY,
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+ UCSI_ERROR,
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+};
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+
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+struct ucsi_connector {
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+ int num;
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+
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+ struct ucsi *ucsi;
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+ struct work_struct work;
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+ struct completion complete;
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+
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+ struct typec_port *port;
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+ struct typec_partner *partner;
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+
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+ struct typec_capability typec_cap;
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+
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+ struct ucsi_connector_status status;
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+ struct ucsi_connector_capability cap;
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+};
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+
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+struct ucsi {
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+ struct device *dev;
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+ struct ucsi_ppm *ppm;
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+
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+ enum ucsi_status status;
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+ struct completion complete;
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+ struct ucsi_capability cap;
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+ struct ucsi_connector *connector;
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+
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+ struct work_struct work;
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+
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+ /* PPM Communication lock */
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+ struct mutex ppm_lock;
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+
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+ /* PPM communication flags */
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+ unsigned long flags;
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+#define EVENT_PENDING 0
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+#define COMMAND_PENDING 1
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+#define ACK_PENDING 2
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+};
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+
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+static inline int ucsi_sync(struct ucsi *ucsi)
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+{
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+ if (ucsi->ppm && ucsi->ppm->sync)
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+ return ucsi->ppm->sync(ucsi->ppm);
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+ return 0;
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+}
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+
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+static int ucsi_command(struct ucsi *ucsi, struct ucsi_control *ctrl)
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+{
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+ int ret;
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+
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+ trace_ucsi_command(ctrl);
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+
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+ set_bit(COMMAND_PENDING, &ucsi->flags);
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+
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+ ret = ucsi->ppm->cmd(ucsi->ppm, ctrl);
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+ if (ret)
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+ goto err_clear_flag;
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+
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+ if (!wait_for_completion_timeout(&ucsi->complete,
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+ msecs_to_jiffies(UCSI_TIMEOUT_MS))) {
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+ dev_warn(ucsi->dev, "PPM NOT RESPONDING\n");
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+ ret = -ETIMEDOUT;
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+ }
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+
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+err_clear_flag:
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+ clear_bit(COMMAND_PENDING, &ucsi->flags);
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+
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+ return ret;
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+}
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+
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+static int ucsi_ack(struct ucsi *ucsi, u8 ack)
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+{
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+ struct ucsi_control ctrl;
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+ int ret;
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+
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+ trace_ucsi_ack(ack);
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+
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+ set_bit(ACK_PENDING, &ucsi->flags);
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+
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+ UCSI_CMD_ACK(ctrl, ack);
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+ ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
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+ if (ret)
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+ goto out_clear_bit;
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+
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+ /* Waiting for ACK with ACK CMD, but not with EVENT for now */
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+ if (ack == UCSI_ACK_EVENT)
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+ goto out_clear_bit;
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+
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+ if (!wait_for_completion_timeout(&ucsi->complete,
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+ msecs_to_jiffies(UCSI_TIMEOUT_MS)))
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+ ret = -ETIMEDOUT;
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+
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+out_clear_bit:
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+ clear_bit(ACK_PENDING, &ucsi->flags);
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+
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+ if (ret)
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+ dev_err(ucsi->dev, "%s: failed\n", __func__);
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+
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+ return ret;
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+}
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+
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+static int ucsi_run_command(struct ucsi *ucsi, struct ucsi_control *ctrl,
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+ void *data, size_t size)
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+{
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+ struct ucsi_control _ctrl;
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+ u8 data_length;
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+ u16 error;
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+ int ret;
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+
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+ ret = ucsi_command(ucsi, ctrl);
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+ if (ret)
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+ goto err;
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+
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+ switch (ucsi->status) {
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+ case UCSI_IDLE:
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+ ret = ucsi_sync(ucsi);
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+ if (ret)
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+ dev_warn(ucsi->dev, "%s: sync failed\n", __func__);
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+
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+ if (data)
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+ memcpy(data, ucsi->ppm->data->message_in, size);
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+
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+ data_length = ucsi->ppm->data->cci.data_length;
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+
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+ ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
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+ if (!ret)
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+ ret = data_length;
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+ break;
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+ case UCSI_BUSY:
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+ /* The caller decides whether to cancel or not */
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+ ret = -EBUSY;
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+ break;
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+ case UCSI_ERROR:
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+ ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
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+ if (ret)
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+ break;
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+
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+ _ctrl.raw_cmd = 0;
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+ _ctrl.cmd.cmd = UCSI_GET_ERROR_STATUS;
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+ ret = ucsi_command(ucsi, &_ctrl);
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+ if (ret) {
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+ dev_err(ucsi->dev, "reading error failed!\n");
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+ break;
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+ }
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+
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+ memcpy(&error, ucsi->ppm->data->message_in, sizeof(error));
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+
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+ /* Something has really gone wrong */
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+ if (WARN_ON(ucsi->status == UCSI_ERROR)) {
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+ ret = -ENODEV;
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+ break;
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+ }
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+
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+ ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
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+ if (ret)
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+ break;
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+
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+ switch (error) {
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+ case UCSI_ERROR_INCOMPATIBLE_PARTNER:
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+ ret = -EOPNOTSUPP;
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+ break;
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+ case UCSI_ERROR_CC_COMMUNICATION_ERR:
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+ ret = -ECOMM;
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+ break;
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+ case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
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+ ret = -EPROTO;
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+ break;
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+ case UCSI_ERROR_DEAD_BATTERY:
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+ dev_warn(ucsi->dev, "Dead battery condition!\n");
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+ ret = -EPERM;
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+ break;
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+ /* The following mean a bug in this driver */
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+ case UCSI_ERROR_INVALID_CON_NUM:
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+ case UCSI_ERROR_UNREGONIZED_CMD:
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+ case UCSI_ERROR_INVALID_CMD_ARGUMENT:
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+ dev_warn(ucsi->dev,
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+ "%s: possible UCSI driver bug - error 0x%x\n",
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+ __func__, error);
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+ ret = -EINVAL;
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+ break;
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+ default:
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+ dev_warn(ucsi->dev,
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+ "%s: error without status\n", __func__);
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+ ret = -EIO;
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+ break;
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+ }
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+ break;
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+ }
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+
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+err:
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+ trace_ucsi_run_command(ctrl, ret);
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+
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+ return ret;
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+}
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+
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+/* -------------------------------------------------------------------------- */
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+
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+static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
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+{
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+ switch (con->status.pwr_op_mode) {
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+ case UCSI_CONSTAT_PWR_OPMODE_PD:
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+ typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
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+ break;
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+ case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
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+ typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
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+ break;
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+ case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
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+ typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
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+ break;
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+ default:
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+ typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
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+ break;
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+ }
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+}
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+
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+static int ucsi_register_partner(struct ucsi_connector *con)
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+{
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+ struct typec_partner_desc partner;
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+
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+ if (con->partner)
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+ return 0;
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+
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+ memset(&partner, 0, sizeof(partner));
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+
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+ switch (con->status.partner_type) {
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+ case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
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+ partner.accessory = TYPEC_ACCESSORY_DEBUG;
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+ break;
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+ case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
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+ partner.accessory = TYPEC_ACCESSORY_AUDIO;
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+ break;
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+ default:
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+ break;
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+ }
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+
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+ partner.usb_pd = con->status.pwr_op_mode == UCSI_CONSTAT_PWR_OPMODE_PD;
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+
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+ con->partner = typec_register_partner(con->port, &partner);
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+ if (!con->partner) {
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+ dev_err(con->ucsi->dev, "con%d: failed to register partner\n",
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+ con->num);
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+ return -ENODEV;
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+ }
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+
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+ return 0;
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+}
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+
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+static void ucsi_unregister_partner(struct ucsi_connector *con)
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+{
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+ typec_unregister_partner(con->partner);
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+ con->partner = NULL;
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+}
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+
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+static void ucsi_connector_change(struct work_struct *work)
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+{
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+ struct ucsi_connector *con = container_of(work, struct ucsi_connector,
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+ work);
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+ struct ucsi *ucsi = con->ucsi;
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+ struct ucsi_control ctrl;
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+ int ret;
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+
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+ mutex_lock(&ucsi->ppm_lock);
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+
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+ UCSI_CMD_GET_CONNECTOR_STATUS(ctrl, con->num);
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+ ret = ucsi_run_command(ucsi, &ctrl, &con->status, sizeof(con->status));
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+ if (ret < 0) {
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+ dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
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+ __func__, ret);
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+ goto out_unlock;
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+ }
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+
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+ if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE)
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+ ucsi_pwr_opmode_change(con);
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+
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+ if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
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+ typec_set_pwr_role(con->port, con->status.pwr_dir);
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+
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+ /* Complete pending power role swap */
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+ if (!completion_done(&con->complete))
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+ complete(&con->complete);
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+ }
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+
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+ if (con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) {
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+ switch (con->status.partner_type) {
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+ case UCSI_CONSTAT_PARTNER_TYPE_UFP:
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+ typec_set_data_role(con->port, TYPEC_HOST);
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+ break;
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+ case UCSI_CONSTAT_PARTNER_TYPE_DFP:
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+ typec_set_data_role(con->port, TYPEC_DEVICE);
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+ break;
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+ default:
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+ break;
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+ }
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+
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+ /* Complete pending data role swap */
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+ if (!completion_done(&con->complete))
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+ complete(&con->complete);
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+ }
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+
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+ if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
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+ if (con->status.connected)
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+ ucsi_register_partner(con);
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+ else
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+ ucsi_unregister_partner(con);
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+ }
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+
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+ ret = ucsi_ack(ucsi, UCSI_ACK_EVENT);
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+ if (ret)
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+ dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
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+
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+ trace_ucsi_connector_change(con->num, &con->status);
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+
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+out_unlock:
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+ clear_bit(EVENT_PENDING, &ucsi->flags);
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+ mutex_unlock(&ucsi->ppm_lock);
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+}
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+
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+/**
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+ * ucsi_notify - PPM notification handler
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+ * @ucsi: Source UCSI Interface for the notifications
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+ *
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+ * Handle notifications from PPM of @ucsi.
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+ */
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+void ucsi_notify(struct ucsi *ucsi)
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+{
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+ struct ucsi_cci *cci;
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+
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+ /* There is no requirement to sync here, but no harm either. */
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+ ucsi_sync(ucsi);
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+
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+ cci = &ucsi->ppm->data->cci;
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+
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+ if (cci->error)
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+ ucsi->status = UCSI_ERROR;
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+ else if (cci->busy)
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+ ucsi->status = UCSI_BUSY;
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+ else
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+ ucsi->status = UCSI_IDLE;
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+
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+ if (cci->cmd_complete && test_bit(COMMAND_PENDING, &ucsi->flags)) {
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+ complete(&ucsi->complete);
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+ } else if (cci->ack_complete && test_bit(ACK_PENDING, &ucsi->flags)) {
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+ complete(&ucsi->complete);
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+ } else if (cci->connector_change) {
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+ struct ucsi_connector *con;
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+
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+ con = &ucsi->connector[cci->connector_change - 1];
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+
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+ if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
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+ schedule_work(&con->work);
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+ }
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+
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+ trace_ucsi_notify(ucsi->ppm->data->raw_cci);
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+}
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+EXPORT_SYMBOL_GPL(ucsi_notify);
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+
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+/* -------------------------------------------------------------------------- */
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+
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+static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
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+{
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+ struct ucsi_control ctrl;
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+
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+ UCSI_CMD_CONNECTOR_RESET(ctrl, con, hard);
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+
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+ return ucsi_run_command(con->ucsi, &ctrl, NULL, 0);
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+}
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+
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+static int ucsi_reset_ppm(struct ucsi *ucsi)
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+{
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+ struct ucsi_control ctrl;
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+ unsigned long tmo;
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+ int ret;
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+
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+ ctrl.raw_cmd = 0;
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|
|
+ ctrl.cmd.cmd = UCSI_PPM_RESET;
|
|
|
+ trace_ucsi_command(&ctrl);
|
|
|
+ ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
|
|
|
+ if (ret)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
|
|
|
+
|
|
|
+ do {
|
|
|
+ /* Here sync is critical. */
|
|
|
+ ret = ucsi_sync(ucsi);
|
|
|
+ if (ret)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ if (ucsi->ppm->data->cci.reset_complete)
|
|
|
+ break;
|
|
|
+
|
|
|
+ /* If the PPM is still doing something else, reset it again. */
|
|
|
+ if (ucsi->ppm->data->raw_cci) {
|
|
|
+ dev_warn_ratelimited(ucsi->dev,
|
|
|
+ "Failed to reset PPM! Trying again..\n");
|
|
|
+
|
|
|
+ trace_ucsi_command(&ctrl);
|
|
|
+ ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
|
|
|
+ if (ret)
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Letting the PPM settle down. */
|
|
|
+ msleep(20);
|
|
|
+
|
|
|
+ ret = -ETIMEDOUT;
|
|
|
+ } while (time_is_after_jiffies(tmo));
|
|
|
+
|
|
|
+err:
|
|
|
+ trace_ucsi_reset_ppm(&ctrl, ret);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int ucsi_role_cmd(struct ucsi_connector *con, struct ucsi_control *ctrl)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ ret = ucsi_run_command(con->ucsi, ctrl, NULL, 0);
|
|
|
+ if (ret == -ETIMEDOUT) {
|
|
|
+ struct ucsi_control c;
|
|
|
+
|
|
|
+ /* PPM most likely stopped responding. Resetting everything. */
|
|
|
+ ucsi_reset_ppm(con->ucsi);
|
|
|
+
|
|
|
+ UCSI_CMD_SET_NTFY_ENABLE(c, UCSI_ENABLE_NTFY_ALL);
|
|
|
+ ucsi_run_command(con->ucsi, &c, NULL, 0);
|
|
|
+
|
|
|
+ ucsi_reset_connector(con, true);
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ucsi_dr_swap(const struct typec_capability *cap, enum typec_data_role role)
|
|
|
+{
|
|
|
+ struct ucsi_connector *con = to_ucsi_connector(cap);
|
|
|
+ struct ucsi_control ctrl;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ if (!con->partner)
|
|
|
+ return -ENOTCONN;
|
|
|
+
|
|
|
+ mutex_lock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ if ((con->status.partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
|
|
|
+ role == TYPEC_DEVICE) ||
|
|
|
+ (con->status.partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
|
|
|
+ role == TYPEC_HOST))
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ UCSI_CMD_SET_UOR(ctrl, con, role);
|
|
|
+ ret = ucsi_role_cmd(con, &ctrl);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ mutex_unlock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ if (!wait_for_completion_timeout(&con->complete,
|
|
|
+ msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
|
|
|
+ return -ETIMEDOUT;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+out_unlock:
|
|
|
+ mutex_unlock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ucsi_pr_swap(const struct typec_capability *cap, enum typec_role role)
|
|
|
+{
|
|
|
+ struct ucsi_connector *con = to_ucsi_connector(cap);
|
|
|
+ struct ucsi_control ctrl;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ if (!con->partner)
|
|
|
+ return -ENOTCONN;
|
|
|
+
|
|
|
+ mutex_lock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ if (con->status.pwr_dir == role)
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ UCSI_CMD_SET_PDR(ctrl, con, role);
|
|
|
+ ret = ucsi_role_cmd(con, &ctrl);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ mutex_unlock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ if (!wait_for_completion_timeout(&con->complete,
|
|
|
+ msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
|
|
|
+ return -ETIMEDOUT;
|
|
|
+
|
|
|
+ mutex_lock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ /* Something has gone wrong while swapping the role */
|
|
|
+ if (con->status.pwr_op_mode != UCSI_CONSTAT_PWR_OPMODE_PD) {
|
|
|
+ ucsi_reset_connector(con, true);
|
|
|
+ ret = -EPROTO;
|
|
|
+ }
|
|
|
+
|
|
|
+out_unlock:
|
|
|
+ mutex_unlock(&con->ucsi->ppm_lock);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
|
|
|
+{
|
|
|
+ struct fwnode_handle *fwnode;
|
|
|
+ int i = 1;
|
|
|
+
|
|
|
+ device_for_each_child_node(con->ucsi->dev, fwnode)
|
|
|
+ if (i++ == con->num)
|
|
|
+ return fwnode;
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+static int ucsi_register_port(struct ucsi *ucsi, int index)
|
|
|
+{
|
|
|
+ struct ucsi_connector *con = &ucsi->connector[index];
|
|
|
+ struct typec_capability *cap = &con->typec_cap;
|
|
|
+ enum typec_accessory *accessory = cap->accessory;
|
|
|
+ struct ucsi_control ctrl;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ INIT_WORK(&con->work, ucsi_connector_change);
|
|
|
+ init_completion(&con->complete);
|
|
|
+ con->num = index + 1;
|
|
|
+ con->ucsi = ucsi;
|
|
|
+
|
|
|
+ /* Get connector capability */
|
|
|
+ UCSI_CMD_GET_CONNECTOR_CAPABILITY(ctrl, con->num);
|
|
|
+ ret = ucsi_run_command(ucsi, &ctrl, &con->cap, sizeof(con->cap));
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
|
|
|
+ cap->type = TYPEC_PORT_DRP;
|
|
|
+ else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
|
|
|
+ cap->type = TYPEC_PORT_DFP;
|
|
|
+ else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
|
|
|
+ cap->type = TYPEC_PORT_UFP;
|
|
|
+
|
|
|
+ cap->revision = ucsi->cap.typec_version;
|
|
|
+ cap->pd_revision = ucsi->cap.pd_version;
|
|
|
+ cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
|
|
|
+
|
|
|
+ if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)
|
|
|
+ *accessory++ = TYPEC_ACCESSORY_AUDIO;
|
|
|
+ if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY)
|
|
|
+ *accessory = TYPEC_ACCESSORY_DEBUG;
|
|
|
+
|
|
|
+ cap->fwnode = ucsi_find_fwnode(con);
|
|
|
+ cap->dr_set = ucsi_dr_swap;
|
|
|
+ cap->pr_set = ucsi_pr_swap;
|
|
|
+
|
|
|
+ /* Register the connector */
|
|
|
+ con->port = typec_register_port(ucsi->dev, cap);
|
|
|
+ if (!con->port)
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ /* Get the status */
|
|
|
+ UCSI_CMD_GET_CONNECTOR_STATUS(ctrl, con->num);
|
|
|
+ ret = ucsi_run_command(ucsi, &ctrl, &con->status, sizeof(con->status));
|
|
|
+ if (ret < 0) {
|
|
|
+ dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ ucsi_pwr_opmode_change(con);
|
|
|
+ typec_set_pwr_role(con->port, con->status.pwr_dir);
|
|
|
+
|
|
|
+ switch (con->status.partner_type) {
|
|
|
+ case UCSI_CONSTAT_PARTNER_TYPE_UFP:
|
|
|
+ typec_set_data_role(con->port, TYPEC_HOST);
|
|
|
+ break;
|
|
|
+ case UCSI_CONSTAT_PARTNER_TYPE_DFP:
|
|
|
+ typec_set_data_role(con->port, TYPEC_DEVICE);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Check if there is already something connected */
|
|
|
+ if (con->status.connected)
|
|
|
+ ucsi_register_partner(con);
|
|
|
+
|
|
|
+ trace_ucsi_register_port(con->num, &con->status);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void ucsi_init(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct ucsi *ucsi = container_of(work, struct ucsi, work);
|
|
|
+ struct ucsi_connector *con;
|
|
|
+ struct ucsi_control ctrl;
|
|
|
+ int ret;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ mutex_lock(&ucsi->ppm_lock);
|
|
|
+
|
|
|
+ /* Reset the PPM */
|
|
|
+ ret = ucsi_reset_ppm(ucsi);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(ucsi->dev, "failed to reset PPM!\n");
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Enable basic notifications */
|
|
|
+ UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_CMD_COMPLETE |
|
|
|
+ UCSI_ENABLE_NTFY_ERROR);
|
|
|
+ ret = ucsi_run_command(ucsi, &ctrl, NULL, 0);
|
|
|
+ if (ret < 0)
|
|
|
+ goto err_reset;
|
|
|
+
|
|
|
+ /* Get PPM capabilities */
|
|
|
+ UCSI_CMD_GET_CAPABILITY(ctrl);
|
|
|
+ ret = ucsi_run_command(ucsi, &ctrl, &ucsi->cap, sizeof(ucsi->cap));
|
|
|
+ if (ret < 0)
|
|
|
+ goto err_reset;
|
|
|
+
|
|
|
+ if (!ucsi->cap.num_connectors) {
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto err_reset;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Allocate the connectors. Released in ucsi_unregister_ppm() */
|
|
|
+ ucsi->connector = kcalloc(ucsi->cap.num_connectors + 1,
|
|
|
+ sizeof(*ucsi->connector), GFP_KERNEL);
|
|
|
+ if (!ucsi->connector) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto err_reset;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Register all connectors */
|
|
|
+ for (i = 0; i < ucsi->cap.num_connectors; i++) {
|
|
|
+ ret = ucsi_register_port(ucsi, i);
|
|
|
+ if (ret)
|
|
|
+ goto err_unregister;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Enable all notifications */
|
|
|
+ UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_ALL);
|
|
|
+ ret = ucsi_run_command(ucsi, &ctrl, NULL, 0);
|
|
|
+ if (ret < 0)
|
|
|
+ goto err_unregister;
|
|
|
+
|
|
|
+ mutex_unlock(&ucsi->ppm_lock);
|
|
|
+
|
|
|
+ return;
|
|
|
+
|
|
|
+err_unregister:
|
|
|
+ for (con = ucsi->connector; con->port; con++) {
|
|
|
+ ucsi_unregister_partner(con);
|
|
|
+ typec_unregister_port(con->port);
|
|
|
+ con->port = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+err_reset:
|
|
|
+ ucsi_reset_ppm(ucsi);
|
|
|
+err:
|
|
|
+ mutex_unlock(&ucsi->ppm_lock);
|
|
|
+ dev_err(ucsi->dev, "PPM init failed (%d)\n", ret);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * ucsi_register_ppm - Register UCSI PPM Interface
|
|
|
+ * @dev: Device interface to the PPM
|
|
|
+ * @ppm: The PPM interface
|
|
|
+ *
|
|
|
+ * Allocates UCSI instance, associates it with @ppm and returns it to the
|
|
|
+ * caller, and schedules initialization of the interface.
|
|
|
+ */
|
|
|
+struct ucsi *ucsi_register_ppm(struct device *dev, struct ucsi_ppm *ppm)
|
|
|
+{
|
|
|
+ struct ucsi *ucsi;
|
|
|
+
|
|
|
+ ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
|
|
|
+ if (!ucsi)
|
|
|
+ return ERR_PTR(-ENOMEM);
|
|
|
+
|
|
|
+ INIT_WORK(&ucsi->work, ucsi_init);
|
|
|
+ init_completion(&ucsi->complete);
|
|
|
+ mutex_init(&ucsi->ppm_lock);
|
|
|
+
|
|
|
+ ucsi->dev = dev;
|
|
|
+ ucsi->ppm = ppm;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Communication with the PPM takes a lot of time. It is not reasonable
|
|
|
+ * to initialize the driver here. Using a work for now.
|
|
|
+ */
|
|
|
+ queue_work(system_long_wq, &ucsi->work);
|
|
|
+
|
|
|
+ return ucsi;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(ucsi_register_ppm);
|
|
|
+
|
|
|
+/**
|
|
|
+ * ucsi_unregister_ppm - Unregister UCSI PPM Interface
|
|
|
+ * @ucsi: struct ucsi associated with the PPM
|
|
|
+ *
|
|
|
+ * Unregister UCSI PPM that was created with ucsi_register().
|
|
|
+ */
|
|
|
+void ucsi_unregister_ppm(struct ucsi *ucsi)
|
|
|
+{
|
|
|
+ struct ucsi_control ctrl;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ /* Make sure that we are not in the middle of driver initialization */
|
|
|
+ cancel_work_sync(&ucsi->work);
|
|
|
+
|
|
|
+ mutex_lock(&ucsi->ppm_lock);
|
|
|
+
|
|
|
+ /* Disable everything except command complete notification */
|
|
|
+ UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_CMD_COMPLETE)
|
|
|
+ ucsi_run_command(ucsi, &ctrl, NULL, 0);
|
|
|
+
|
|
|
+ mutex_unlock(&ucsi->ppm_lock);
|
|
|
+
|
|
|
+ for (i = 0; i < ucsi->cap.num_connectors; i++) {
|
|
|
+ cancel_work_sync(&ucsi->connector[i].work);
|
|
|
+ ucsi_unregister_partner(&ucsi->connector[i]);
|
|
|
+ typec_unregister_port(ucsi->connector[i].port);
|
|
|
+ }
|
|
|
+
|
|
|
+ ucsi_reset_ppm(ucsi);
|
|
|
+
|
|
|
+ kfree(ucsi->connector);
|
|
|
+ kfree(ucsi);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(ucsi_unregister_ppm);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
|
|
|
+MODULE_LICENSE("GPL v2");
|
|
|
+MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver");
|
Heikki Krogerus