+++ /dev/null
-/*
- * 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)
-{
- uuid_le uuid = UUID_LE(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), uuid.b, 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");
+++ /dev/null
-
-#include <linux/types.h>
-
-/* -------------------------------------------------------------------------- */
-
-/* Command Status and Connector Change Indication (CCI) data structure */
-struct ucsi_cci {
- unsigned int RESERVED1:1;
- unsigned int connector_change:7;
- u8 data_length;
- unsigned int RESERVED9:9;
- unsigned int not_supported:1;
- unsigned int cancel_complete:1;
- unsigned int reset_complete:1;
- unsigned int busy:1;
- unsigned int ack_complete:1;
- unsigned int error:1;
- unsigned int cmd_complete:1;
-} __packed;
-
-/* Default fields in CONTROL data structure */
-struct ucsi_command {
- u8 cmd;
- u8 length;
- u64 data:48;
-} __packed;
-
-/* Set USB Operation Mode Command structure */
-struct ucsi_uor_cmd {
- u8 cmd;
- u8 length;
- u64 con_num:7;
- u64 role:3;
-#define UCSI_UOR_ROLE_DFP BIT(0)
-#define UCSI_UOR_ROLE_UFP BIT(1)
-#define UCSI_UOR_ROLE_DRP BIT(2)
- u64 data:38;
-} __packed;
-
-struct ucsi_control {
- union {
- u64 raw_cmd;
- struct ucsi_command cmd;
- struct ucsi_uor_cmd uor;
- };
-};
-
-struct ucsi_data {
- u16 version;
- u16 RESERVED;
- union {
- u32 raw_cci;
- struct ucsi_cci cci;
- };
- struct ucsi_control ctrl;
- u32 message_in[4];
- u32 message_out[4];
-} __packed;
-
-/* Commands */
-#define UCSI_PPM_RESET 0x01
-#define UCSI_CANCEL 0x02
-#define UCSI_CONNECTOR_RESET 0x03
-#define UCSI_ACK_CC_CI 0x04
-#define UCSI_SET_NOTIFICATION_ENABLE 0x05
-#define UCSI_GET_CAPABILITY 0x06
-#define UCSI_GET_CONNECTOR_CAPABILITY 0x07
-#define UCSI_SET_UOM 0x08
-#define UCSI_SET_UOR 0x09
-#define UCSI_SET_PDM 0x0A
-#define UCSI_SET_PDR 0x0B
-#define UCSI_GET_ALTERNATE_MODES 0x0C
-#define UCSI_GET_CAM_SUPPORTED 0x0D
-#define UCSI_GET_CURRENT_CAM 0x0E
-#define UCSI_SET_NEW_CAM 0x0F
-#define UCSI_GET_PDOS 0x10
-#define UCSI_GET_CABLE_PROPERTY 0x11
-#define UCSI_GET_CONNECTOR_STATUS 0x12
-#define UCSI_GET_ERROR_STATUS 0x13
-
-/* ACK_CC_CI commands */
-#define UCSI_ACK_EVENT 1
-#define UCSI_ACK_CMD 2
-
-/* Bits for SET_NOTIFICATION_ENABLE command */
-#define UCSI_ENABLE_NTFY_CMD_COMPLETE BIT(0)
-#define UCSI_ENABLE_NTFY_EXT_PWR_SRC_CHANGE BIT(1)
-#define UCSI_ENABLE_NTFY_PWR_OPMODE_CHANGE BIT(2)
-#define UCSI_ENABLE_NTFY_CAP_CHANGE BIT(5)
-#define UCSI_ENABLE_NTFY_PWR_LEVEL_CHANGE BIT(6)
-#define UCSI_ENABLE_NTFY_PD_RESET_COMPLETE BIT(7)
-#define UCSI_ENABLE_NTFY_CAM_CHANGE BIT(8)
-#define UCSI_ENABLE_NTFY_BAT_STATUS_CHANGE BIT(9)
-#define UCSI_ENABLE_NTFY_PARTNER_CHANGE BIT(11)
-#define UCSI_ENABLE_NTFY_PWR_DIR_CHANGE BIT(12)
-#define UCSI_ENABLE_NTFY_CONNECTOR_CHANGE BIT(14)
-#define UCSI_ENABLE_NTFY_ERROR BIT(15)
-#define UCSI_ENABLE_NTFY_ALL 0xdbe7
-
-/* Error information returned by PPM in response to GET_ERROR_STATUS command. */
-#define UCSI_ERROR_UNREGONIZED_CMD BIT(0)
-#define UCSI_ERROR_INVALID_CON_NUM BIT(1)
-#define UCSI_ERROR_INVALID_CMD_ARGUMENT BIT(2)
-#define UCSI_ERROR_INCOMPATIBLE_PARTNER BIT(3)
-#define UCSI_ERROR_CC_COMMUNICATION_ERR BIT(4)
-#define UCSI_ERROR_DEAD_BATTERY BIT(5)
-#define UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL BIT(6)
-
-/* Data structure filled by PPM in response to GET_CAPABILITY command. */
-struct ucsi_capability {
- u32 attributes;
-#define UCSI_CAP_ATTR_DISABLE_STATE BIT(0)
-#define UCSI_CAP_ATTR_BATTERY_CHARGING BIT(1)
-#define UCSI_CAP_ATTR_USB_PD BIT(2)
-#define UCSI_CAP_ATTR_TYPEC_CURRENT BIT(6)
-#define UCSI_CAP_ATTR_POWER_AC_SUPPLY BIT(8)
-#define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
-#define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
- u8 num_connectors;
- u32 features:24;
-#define UCSI_CAP_SET_UOM BIT(0)
-#define UCSI_CAP_SET_PDM BIT(1)
-#define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
-#define UCSI_CAP_ALT_MODE_OVERRIDE BIT(3)
-#define UCSI_CAP_PDO_DETAILS BIT(4)
-#define UCSI_CAP_CABLE_DETAILS BIT(5)
-#define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
-#define UCSI_CAP_PD_RESET BIT(7)
- u8 num_alt_modes;
- u8 RESERVED;
- u16 bc_version;
- u16 pd_version;
- u16 typec_version;
-} __packed;
-
-/* Data structure filled by PPM in response to GET_CONNECTOR_CAPABILITY cmd. */
-struct ucsi_connector_capability {
- u8 op_mode;
-#define UCSI_CONCAP_OPMODE_DFP BIT(0)
-#define UCSI_CONCAP_OPMODE_UFP BIT(1)
-#define UCSI_CONCAP_OPMODE_DRP BIT(2)
-#define UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY BIT(3)
-#define UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY BIT(4)
-#define UCSI_CONCAP_OPMODE_USB2 BIT(5)
-#define UCSI_CONCAP_OPMODE_USB3 BIT(6)
-#define UCSI_CONCAP_OPMODE_ALT_MODE BIT(7)
- u8 provider:1;
- u8 consumer:1;
-} __packed;
-
-/* Data structure filled by PPM in response to GET_CABLE_PROPERTY command. */
-struct ucsi_cable_property {
- u16 speed_supported;
- u8 current_capability;
- u8 vbus_in_cable:1;
- u8 active_cable:1;
- u8 directionality:1;
- u8 plug_type:2;
-#define UCSI_CABLE_PROPERTY_PLUG_TYPE_A 0
-#define UCSI_CABLE_PROPERTY_PLUG_TYPE_B 1
-#define UCSI_CABLE_PROPERTY_PLUG_TYPE_C 2
-#define UCSI_CABLE_PROPERTY_PLUG_OTHER 3
- u8 mode_support:1;
- u8 RESERVED_2:2;
- u8 latency:4;
- u8 RESERVED_4:4;
-} __packed;
-
-/* Data structure filled by PPM in response to GET_CONNECTOR_STATUS command. */
-struct ucsi_connector_status {
- u16 change;
-#define UCSI_CONSTAT_EXT_SUPPLY_CHANGE BIT(1)
-#define UCSI_CONSTAT_POWER_OPMODE_CHANGE BIT(2)
-#define UCSI_CONSTAT_PDOS_CHANGE BIT(5)
-#define UCSI_CONSTAT_POWER_LEVEL_CHANGE BIT(6)
-#define UCSI_CONSTAT_PD_RESET_COMPLETE BIT(7)
-#define UCSI_CONSTAT_CAM_CHANGE BIT(8)
-#define UCSI_CONSTAT_BC_CHANGE BIT(9)
-#define UCSI_CONSTAT_PARTNER_CHANGE BIT(11)
-#define UCSI_CONSTAT_POWER_DIR_CHANGE BIT(12)
-#define UCSI_CONSTAT_CONNECT_CHANGE BIT(14)
-#define UCSI_CONSTAT_ERROR BIT(15)
- u16 pwr_op_mode:3;
-#define UCSI_CONSTAT_PWR_OPMODE_NONE 0
-#define UCSI_CONSTAT_PWR_OPMODE_DEFAULT 1
-#define UCSI_CONSTAT_PWR_OPMODE_BC 2
-#define UCSI_CONSTAT_PWR_OPMODE_PD 3
-#define UCSI_CONSTAT_PWR_OPMODE_TYPEC1_3 4
-#define UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0 5
- u16 connected:1;
- u16 pwr_dir:1;
- u16 partner_flags:8;
-#define UCSI_CONSTAT_PARTNER_FLAG_USB BIT(0)
-#define UCSI_CONSTAT_PARTNER_FLAG_ALT_MODE BIT(1)
- u16 partner_type:3;
-#define UCSI_CONSTAT_PARTNER_TYPE_DFP 1
-#define UCSI_CONSTAT_PARTNER_TYPE_UFP 2
-#define UCSI_CONSTAT_PARTNER_TYPE_CABLE_NO_UFP 3 /* Powered Cable */
-#define UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP 4 /* Powered Cable */
-#define UCSI_CONSTAT_PARTNER_TYPE_DEBUG 5
-#define UCSI_CONSTAT_PARTNER_TYPE_AUDIO 6
- u32 request_data_obj;
- u8 bc_status:2;
-#define UCSI_CONSTAT_BC_NOT_CHARGING 0
-#define UCSI_CONSTAT_BC_NOMINAL_CHARGING 1
-#define UCSI_CONSTAT_BC_SLOW_CHARGING 2
-#define UCSI_CONSTAT_BC_TRICKLE_CHARGING 3
- u8 provider_cap_limit_reason:4;
-#define UCSI_CONSTAT_CAP_PWR_LOWERED 0
-#define UCSI_CONSTAT_CAP_PWR_BUDGET_LIMIT 1
- u8 RESERVED:2;
-} __packed;
-
-/* -------------------------------------------------------------------------- */
-
--- /dev/null
+/*
+ * UCSI ACPI driver
+ *
+ * Copyright (C) 2017, 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/acpi.h>
+
+#include "ucsi.h"
+
+#define UCSI_DSM_UUID "6f8398c2-7ca4-11e4-ad36-631042b5008f"
+#define UCSI_DSM_FUNC_WRITE 1
+#define UCSI_DSM_FUNC_READ 2
+
+struct ucsi_acpi {
+ struct device *dev;
+ struct ucsi *ucsi;
+ struct ucsi_ppm ppm;
+ uuid_le uuid;
+};
+
+static int ucsi_acpi_dsm(struct ucsi_acpi *ua, int func)
+{
+ union acpi_object *obj;
+
+ obj = acpi_evaluate_dsm(ACPI_HANDLE(ua->dev), ua->uuid.b, 1, func,
+ NULL);
+ if (!obj) {
+ dev_err(ua->dev, "%s: failed to evaluate _DSM %d\n",
+ __func__, func);
+ return -EIO;
+ }
+
+ ACPI_FREE(obj);
+ return 0;
+}
+
+static int ucsi_acpi_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl)
+{
+ struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
+
+ ppm->data->ctrl.raw_cmd = ctrl->raw_cmd;
+
+ return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_WRITE);
+}
+
+static int ucsi_acpi_sync(struct ucsi_ppm *ppm)
+{
+ struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
+
+ return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+}
+
+static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct ucsi_acpi *ua = data;
+
+ ucsi_notify(ua->ucsi);
+}
+
+static int ucsi_acpi_probe(struct platform_device *pdev)
+{
+ struct ucsi_acpi *ua;
+ struct resource *res;
+ acpi_status status;
+ int ret;
+
+ ua = devm_kzalloc(&pdev->dev, sizeof(*ua), GFP_KERNEL);
+ if (!ua)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "missing memory resource\n");
+ return -ENODEV;
+ }
+
+ /*
+ * NOTE: The memory region for the data structures is used also in an
+ * operation region, which means ACPI has already reserved it. Therefore
+ * it can not be requested here, and we can not use
+ * devm_ioremap_resource().
+ */
+ ua->ppm.data = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!ua->ppm.data)
+ return -ENOMEM;
+
+ if (!ua->ppm.data->version)
+ return -ENODEV;
+
+ ret = uuid_le_to_bin(UCSI_DSM_UUID, &ua->uuid);
+ if (ret)
+ return ret;
+
+ ua->ppm.cmd = ucsi_acpi_cmd;
+ ua->ppm.sync = ucsi_acpi_sync;
+ ua->dev = &pdev->dev;
+
+ status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
+ ACPI_DEVICE_NOTIFY,
+ ucsi_acpi_notify, ua);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&pdev->dev, "failed to install notify handler\n");
+ return -ENODEV;
+ }
+
+ ua->ucsi = ucsi_register_ppm(&pdev->dev, &ua->ppm);
+ if (IS_ERR(ua->ucsi)) {
+ acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
+ ACPI_DEVICE_NOTIFY,
+ ucsi_acpi_notify);
+ return PTR_ERR(ua->ucsi);
+ }
+
+ platform_set_drvdata(pdev, ua);
+
+ return 0;
+}
+
+static int ucsi_acpi_remove(struct platform_device *pdev)
+{
+ struct ucsi_acpi *ua = platform_get_drvdata(pdev);
+
+ ucsi_unregister_ppm(ua->ucsi);
+
+ acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), ACPI_DEVICE_NOTIFY,
+ ucsi_acpi_notify);
+
+ 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("UCSI ACPI driver");
git.samba.org / sfrench / cifs-2.6.git / commitdiff