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path: root/drivers/usb/misc/ucsi.c
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Diffstat (limited to 'drivers/usb/misc/ucsi.c')
-rw-r--r--drivers/usb/misc/ucsi.c478
1 files changed, 0 insertions, 478 deletions
diff --git a/drivers/usb/misc/ucsi.c b/drivers/usb/misc/ucsi.c
deleted file mode 100644
index 81251aaa20f9..000000000000
--- a/drivers/usb/misc/ucsi.c
+++ /dev/null
@@ -1,478 +0,0 @@
-/*
- * USB Type-C Connector System Software Interface driver
- *
- * Copyright (C) 2016, Intel Corporation
- * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/acpi.h>
-
-#include "ucsi.h"
-
-/* Double the time defined by MIN_TIME_TO_RESPOND_WITH_BUSY */
-#define UCSI_TIMEOUT_MS 20
-
-enum ucsi_status {
- UCSI_IDLE = 0,
- UCSI_BUSY,
- UCSI_ERROR,
-};
-
-struct ucsi_connector {
- int num;
- struct ucsi *ucsi;
- struct work_struct work;
- struct ucsi_connector_capability cap;
-};
-
-struct ucsi {
- struct device *dev;
- struct ucsi_data __iomem *data;
-
- enum ucsi_status status;
- struct completion complete;
- struct ucsi_capability cap;
- struct ucsi_connector *connector;
-
- /* device lock */
- spinlock_t dev_lock;
-
- /* PPM Communication lock */
- struct mutex ppm_lock;
-
- /* PPM communication flags */
- unsigned long flags;
-#define EVENT_PENDING 0
-#define COMMAND_PENDING 1
-};
-
-static int ucsi_acpi_cmd(struct ucsi *ucsi, struct ucsi_control *ctrl)
-{
- guid_t guid = GUID_INIT(0x6f8398c2, 0x7ca4, 0x11e4,
- 0xad, 0x36, 0x63, 0x10, 0x42, 0xb5, 0x00, 0x8f);
- union acpi_object *obj;
-
- ucsi->data->ctrl.raw_cmd = ctrl->raw_cmd;
-
- obj = acpi_evaluate_dsm(ACPI_HANDLE(ucsi->dev), &guid, 1, 1, NULL);
- if (!obj) {
- dev_err(ucsi->dev, "%s: failed to evaluate _DSM\n", __func__);
- return -EIO;
- }
-
- ACPI_FREE(obj);
- return 0;
-}
-
-static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
-{
- struct ucsi *ucsi = data;
- struct ucsi_cci *cci;
-
- spin_lock(&ucsi->dev_lock);
-
- ucsi->status = UCSI_IDLE;
- cci = &ucsi->data->cci;
-
- /*
- * REVISIT: This is not documented behavior, but all known PPMs ACK
- * asynchronous events by sending notification with cleared CCI.
- */
- if (!ucsi->data->raw_cci) {
- if (test_bit(EVENT_PENDING, &ucsi->flags))
- complete(&ucsi->complete);
- else
- dev_WARN(ucsi->dev, "spurious notification\n");
- goto out_unlock;
- }
-
- if (test_bit(COMMAND_PENDING, &ucsi->flags)) {
- if (cci->busy) {
- ucsi->status = UCSI_BUSY;
- complete(&ucsi->complete);
-
- goto out_unlock;
- } else if (cci->ack_complete || cci->cmd_complete) {
- /* Error Indication is only valid with commands */
- if (cci->error && cci->cmd_complete)
- ucsi->status = UCSI_ERROR;
-
- ucsi->data->ctrl.raw_cmd = 0;
- complete(&ucsi->complete);
- }
- }
-
- if (cci->connector_change) {
- struct ucsi_connector *con;
-
- /*
- * This is workaround for buggy PPMs that create asynchronous
- * event notifications before OPM has enabled them.
- */
- if (!ucsi->connector)
- goto out_unlock;
-
- con = ucsi->connector + (cci->connector_change - 1);
-
- /*
- * PPM will not clear the connector specific bit in Connector
- * Change Indication field of CCI until the driver has ACK it,
- * and the driver can not ACK it before it has been processed.
- * The PPM will not generate new events before the first has
- * been acknowledged, even if they are for an other connector.
- * So only one event at a time.
- */
- if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
- schedule_work(&con->work);
- }
-out_unlock:
- spin_unlock(&ucsi->dev_lock);
-}
-
-static int ucsi_ack(struct ucsi *ucsi, u8 cmd)
-{
- struct ucsi_control ctrl;
- int ret;
-
- ctrl.cmd.cmd = UCSI_ACK_CC_CI;
- ctrl.cmd.length = 0;
- ctrl.cmd.data = cmd;
- ret = ucsi_acpi_cmd(ucsi, &ctrl);
- if (ret)
- return ret;
-
- /* Waiting for ACK also with ACK CMD for now */
- ret = wait_for_completion_timeout(&ucsi->complete,
- msecs_to_jiffies(UCSI_TIMEOUT_MS));
- if (!ret)
- return -ETIMEDOUT;
- return 0;
-}
-
-static int ucsi_run_cmd(struct ucsi *ucsi, struct ucsi_control *ctrl,
- void *data, size_t size)
-{
- u16 err_value = 0;
- int ret;
-
- set_bit(COMMAND_PENDING, &ucsi->flags);
-
- ret = ucsi_acpi_cmd(ucsi, ctrl);
- if (ret)
- goto err_clear_flag;
-
- ret = wait_for_completion_timeout(&ucsi->complete,
- msecs_to_jiffies(UCSI_TIMEOUT_MS));
- if (!ret) {
- ret = -ETIMEDOUT;
- goto err_clear_flag;
- }
-
- switch (ucsi->status) {
- case UCSI_IDLE:
- if (data)
- memcpy(data, ucsi->data->message_in, size);
-
- ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
- break;
- case UCSI_BUSY:
- /* The caller decides whether to cancel or not */
- ret = -EBUSY;
- goto err_clear_flag;
- case UCSI_ERROR:
- ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
- if (ret)
- goto err_clear_flag;
-
- ctrl->cmd.cmd = UCSI_GET_ERROR_STATUS;
- ctrl->cmd.length = 0;
- ctrl->cmd.data = 0;
- ret = ucsi_acpi_cmd(ucsi, ctrl);
- if (ret)
- goto err_clear_flag;
-
- ret = wait_for_completion_timeout(&ucsi->complete,
- msecs_to_jiffies(UCSI_TIMEOUT_MS));
- if (!ret) {
- ret = -ETIMEDOUT;
- goto err_clear_flag;
- }
-
- memcpy(&err_value, ucsi->data->message_in, sizeof(err_value));
-
- /* Something has really gone wrong */
- if (WARN_ON(ucsi->status == UCSI_ERROR)) {
- ret = -ENODEV;
- goto err_clear_flag;
- }
-
- ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
- if (ret)
- goto err_clear_flag;
-
- switch (err_value) {
- case UCSI_ERROR_INCOMPATIBLE_PARTNER:
- ret = -EOPNOTSUPP;
- break;
- case UCSI_ERROR_CC_COMMUNICATION_ERR:
- ret = -ECOMM;
- break;
- case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
- ret = -EIO;
- break;
- case UCSI_ERROR_DEAD_BATTERY:
- dev_warn(ucsi->dev, "Dead battery condition!\n");
- ret = -EPERM;
- break;
- /* The following mean a bug in this driver */
- case UCSI_ERROR_INVALID_CON_NUM:
- case UCSI_ERROR_UNREGONIZED_CMD:
- case UCSI_ERROR_INVALID_CMD_ARGUMENT:
- default:
- dev_warn(ucsi->dev,
- "%s: possible UCSI driver bug - error %hu\n",
- __func__, err_value);
- ret = -EINVAL;
- break;
- }
- break;
- }
- ctrl->raw_cmd = 0;
-err_clear_flag:
- clear_bit(COMMAND_PENDING, &ucsi->flags);
- return ret;
-}
-
-static void ucsi_connector_change(struct work_struct *work)
-{
- struct ucsi_connector *con = container_of(work, struct ucsi_connector,
- work);
- struct ucsi_connector_status constat;
- struct ucsi *ucsi = con->ucsi;
- struct ucsi_control ctrl;
- int ret;
-
- mutex_lock(&ucsi->ppm_lock);
-
- ctrl.cmd.cmd = UCSI_GET_CONNECTOR_STATUS;
- ctrl.cmd.length = 0;
- ctrl.cmd.data = con->num;
- ret = ucsi_run_cmd(con->ucsi, &ctrl, &constat, sizeof(constat));
- if (ret) {
- dev_err(ucsi->dev, "%s: failed to read connector status (%d)\n",
- __func__, ret);
- goto out_ack_event;
- }
-
- /* Ignoring disconnections and Alternate Modes */
- if (!constat.connected || !(constat.change &
- (UCSI_CONSTAT_PARTNER_CHANGE | UCSI_CONSTAT_CONNECT_CHANGE)) ||
- constat.partner_flags & UCSI_CONSTAT_PARTNER_FLAG_ALT_MODE)
- goto out_ack_event;
-
- /* If the partner got USB Host role, attempting swap */
- if (constat.partner_type & UCSI_CONSTAT_PARTNER_TYPE_DFP) {
- ctrl.uor.cmd = UCSI_SET_UOR;
- ctrl.uor.con_num = con->num;
- ctrl.uor.role = UCSI_UOR_ROLE_DFP;
-
- ret = ucsi_run_cmd(con->ucsi, &ctrl, NULL, 0);
- if (ret)
- dev_err(ucsi->dev, "%s: failed to swap role (%d)\n",
- __func__, ret);
- }
-out_ack_event:
- ucsi_ack(ucsi, UCSI_ACK_EVENT);
- clear_bit(EVENT_PENDING, &ucsi->flags);
- mutex_unlock(&ucsi->ppm_lock);
-}
-
-static int ucsi_reset_ppm(struct ucsi *ucsi)
-{
- int timeout = UCSI_TIMEOUT_MS;
- struct ucsi_control ctrl;
- int ret;
-
- memset(&ctrl, 0, sizeof(ctrl));
- ctrl.cmd.cmd = UCSI_PPM_RESET;
- ret = ucsi_acpi_cmd(ucsi, &ctrl);
- if (ret)
- return ret;
-
- /* There is no quarantee the PPM will ever set the RESET_COMPLETE bit */
- while (!ucsi->data->cci.reset_complete && timeout--)
- usleep_range(1000, 2000);
- return 0;
-}
-
-static int ucsi_init(struct ucsi *ucsi)
-{
- struct ucsi_connector *con;
- struct ucsi_control ctrl;
- int ret;
- int i;
-
- init_completion(&ucsi->complete);
- spin_lock_init(&ucsi->dev_lock);
- mutex_init(&ucsi->ppm_lock);
-
- /* Reset the PPM */
- ret = ucsi_reset_ppm(ucsi);
- if (ret)
- return ret;
-
- /*
- * REVISIT: Executing second reset to WA an issue seen on some of the
- * Broxton based platforms, where the first reset puts the PPM into a
- * state where it's unable to recognise some of the commands.
- */
- ret = ucsi_reset_ppm(ucsi);
- if (ret)
- return ret;
-
- mutex_lock(&ucsi->ppm_lock);
-
- /* Enable basic notifications */
- ctrl.cmd.cmd = UCSI_SET_NOTIFICATION_ENABLE;
- ctrl.cmd.length = 0;
- ctrl.cmd.data = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
- ret = ucsi_run_cmd(ucsi, &ctrl, NULL, 0);
- if (ret)
- goto err_reset;
-
- /* Get PPM capabilities */
- ctrl.cmd.cmd = UCSI_GET_CAPABILITY;
- ret = ucsi_run_cmd(ucsi, &ctrl, &ucsi->cap, sizeof(ucsi->cap));
- if (ret)
- goto err_reset;
-
- if (!ucsi->cap.num_connectors) {
- ret = -ENODEV;
- goto err_reset;
- }
-
- ucsi->connector = devm_kcalloc(ucsi->dev, ucsi->cap.num_connectors,
- sizeof(*ucsi->connector), GFP_KERNEL);
- if (!ucsi->connector) {
- ret = -ENOMEM;
- goto err_reset;
- }
-
- for (i = 1, con = ucsi->connector; i < ucsi->cap.num_connectors + 1;
- i++, con++) {
- /* Get connector capability */
- ctrl.cmd.cmd = UCSI_GET_CONNECTOR_CAPABILITY;
- ctrl.cmd.data = i;
- ret = ucsi_run_cmd(ucsi, &ctrl, &con->cap, sizeof(con->cap));
- if (ret)
- goto err_reset;
-
- con->num = i;
- con->ucsi = ucsi;
- INIT_WORK(&con->work, ucsi_connector_change);
- }
-
- /* Enable all notifications */
- ctrl.cmd.cmd = UCSI_SET_NOTIFICATION_ENABLE;
- ctrl.cmd.data = UCSI_ENABLE_NTFY_ALL;
- ret = ucsi_run_cmd(ucsi, &ctrl, NULL, 0);
- if (ret < 0)
- goto err_reset;
-
- mutex_unlock(&ucsi->ppm_lock);
- return 0;
-err_reset:
- ucsi_reset_ppm(ucsi);
- mutex_unlock(&ucsi->ppm_lock);
- return ret;
-}
-
-static int ucsi_acpi_probe(struct platform_device *pdev)
-{
- struct resource *res;
- acpi_status status;
- struct ucsi *ucsi;
- int ret;
-
- ucsi = devm_kzalloc(&pdev->dev, sizeof(*ucsi), GFP_KERNEL);
- if (!ucsi)
- return -ENOMEM;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "missing memory resource\n");
- return -ENODEV;
- }
-
- /*
- * NOTE: ACPI has claimed the memory region as it's also an Operation
- * Region. It's not possible to request it in the driver.
- */
- ucsi->data = devm_ioremap(&pdev->dev, res->start, resource_size(res));
- if (!ucsi->data)
- return -ENOMEM;
-
- ucsi->dev = &pdev->dev;
-
- status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
- ACPI_ALL_NOTIFY,
- ucsi_acpi_notify, ucsi);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- ret = ucsi_init(ucsi);
- if (ret) {
- acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
- ACPI_ALL_NOTIFY,
- ucsi_acpi_notify);
- return ret;
- }
-
- platform_set_drvdata(pdev, ucsi);
- return 0;
-}
-
-static int ucsi_acpi_remove(struct platform_device *pdev)
-{
- struct ucsi *ucsi = platform_get_drvdata(pdev);
-
- acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
- ACPI_ALL_NOTIFY, ucsi_acpi_notify);
-
- /* Make sure there are no events in the middle of being processed */
- if (wait_on_bit_timeout(&ucsi->flags, EVENT_PENDING,
- TASK_UNINTERRUPTIBLE,
- msecs_to_jiffies(UCSI_TIMEOUT_MS)))
- dev_WARN(ucsi->dev, "%s: Events still pending\n", __func__);
-
- ucsi_reset_ppm(ucsi);
- return 0;
-}
-
-static const struct acpi_device_id ucsi_acpi_match[] = {
- { "PNP0CA0", 0 },
- { },
-};
-MODULE_DEVICE_TABLE(acpi, ucsi_acpi_match);
-
-static struct platform_driver ucsi_acpi_platform_driver = {
- .driver = {
- .name = "ucsi_acpi",
- .acpi_match_table = ACPI_PTR(ucsi_acpi_match),
- },
- .probe = ucsi_acpi_probe,
- .remove = ucsi_acpi_remove,
-};
-
-module_platform_driver(ucsi_acpi_platform_driver);
-
-MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("USB Type-C System Software Interface (UCSI) driver");