| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * USB Type-C Connector System Software Interface driver |
| * |
| * Copyright (C) 2017, Intel Corporation |
| * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> |
| */ |
| |
| #include <linux/completion.h> |
| #include <linux/property.h> |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/usb/typec_dp.h> |
| |
| #include "ucsi.h" |
| #include "trace.h" |
| |
| /* |
| * UCSI_TIMEOUT_MS - PPM communication timeout |
| * |
| * Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI |
| * specification) here as reference, but unfortunately we can't. It is very |
| * difficult to estimate the time it takes for the system to process the command |
| * before it is actually passed to the PPM. |
| */ |
| #define UCSI_TIMEOUT_MS 5000 |
| |
| /* |
| * UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests |
| * |
| * 5 seconds is close to the time it takes for CapsCounter to reach 0, so even |
| * if the PPM does not generate Connector Change events before that with |
| * partners that do not support USB Power Delivery, this should still work. |
| */ |
| #define UCSI_SWAP_TIMEOUT_MS 5000 |
| |
| static int ucsi_acknowledge_command(struct ucsi *ucsi) |
| { |
| u64 ctrl; |
| |
| ctrl = UCSI_ACK_CC_CI; |
| ctrl |= UCSI_ACK_COMMAND_COMPLETE; |
| |
| return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); |
| } |
| |
| static int ucsi_acknowledge_connector_change(struct ucsi *ucsi) |
| { |
| u64 ctrl; |
| |
| ctrl = UCSI_ACK_CC_CI; |
| ctrl |= UCSI_ACK_CONNECTOR_CHANGE; |
| |
| return ucsi->ops->async_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); |
| } |
| |
| static int ucsi_exec_command(struct ucsi *ucsi, u64 command); |
| |
| static int ucsi_read_error(struct ucsi *ucsi) |
| { |
| u16 error; |
| int ret; |
| |
| /* Acknowlege the command that failed */ |
| ret = ucsi_acknowledge_command(ucsi); |
| if (ret) |
| return ret; |
| |
| ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS); |
| if (ret < 0) |
| return ret; |
| |
| ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error)); |
| if (ret) |
| return ret; |
| |
| switch (error) { |
| case UCSI_ERROR_INCOMPATIBLE_PARTNER: |
| return -EOPNOTSUPP; |
| case UCSI_ERROR_CC_COMMUNICATION_ERR: |
| return -ECOMM; |
| case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL: |
| return -EPROTO; |
| case UCSI_ERROR_DEAD_BATTERY: |
| dev_warn(ucsi->dev, "Dead battery condition!\n"); |
| return -EPERM; |
| case UCSI_ERROR_INVALID_CON_NUM: |
| case UCSI_ERROR_UNREGONIZED_CMD: |
| case UCSI_ERROR_INVALID_CMD_ARGUMENT: |
| dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error); |
| return -EINVAL; |
| case UCSI_ERROR_OVERCURRENT: |
| dev_warn(ucsi->dev, "Overcurrent condition\n"); |
| break; |
| case UCSI_ERROR_PARTNER_REJECTED_SWAP: |
| dev_warn(ucsi->dev, "Partner rejected swap\n"); |
| break; |
| case UCSI_ERROR_HARD_RESET: |
| dev_warn(ucsi->dev, "Hard reset occurred\n"); |
| break; |
| case UCSI_ERROR_PPM_POLICY_CONFLICT: |
| dev_warn(ucsi->dev, "PPM Policy conflict\n"); |
| break; |
| case UCSI_ERROR_SWAP_REJECTED: |
| dev_warn(ucsi->dev, "Swap rejected\n"); |
| break; |
| case UCSI_ERROR_UNDEFINED: |
| default: |
| dev_err(ucsi->dev, "unknown error %u\n", error); |
| break; |
| } |
| |
| return -EIO; |
| } |
| |
| static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd) |
| { |
| u32 cci; |
| int ret; |
| |
| ret = ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); |
| if (ret) |
| return ret; |
| |
| ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); |
| if (ret) |
| return ret; |
| |
| if (cci & UCSI_CCI_BUSY) |
| return -EBUSY; |
| |
| if (!(cci & UCSI_CCI_COMMAND_COMPLETE)) |
| return -EIO; |
| |
| if (cci & UCSI_CCI_NOT_SUPPORTED) |
| return -EOPNOTSUPP; |
| |
| if (cci & UCSI_CCI_ERROR) { |
| if (cmd == UCSI_GET_ERROR_STATUS) |
| return -EIO; |
| return ucsi_read_error(ucsi); |
| } |
| |
| return UCSI_CCI_LENGTH(cci); |
| } |
| |
| int ucsi_send_command(struct ucsi *ucsi, u64 command, |
| void *data, size_t size) |
| { |
| u8 length; |
| int ret; |
| |
| mutex_lock(&ucsi->ppm_lock); |
| |
| ret = ucsi_exec_command(ucsi, command); |
| if (ret < 0) |
| goto out; |
| |
| length = ret; |
| |
| if (data) { |
| ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size); |
| if (ret) |
| goto out; |
| } |
| |
| ret = ucsi_acknowledge_command(ucsi); |
| if (ret) |
| goto out; |
| |
| ret = length; |
| out: |
| mutex_unlock(&ucsi->ppm_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(ucsi_send_command); |
| |
| int ucsi_resume(struct ucsi *ucsi) |
| { |
| u64 command; |
| |
| /* Restore UCSI notification enable mask after system resume */ |
| command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; |
| |
| return ucsi_send_command(ucsi, command, NULL, 0); |
| } |
| EXPORT_SYMBOL_GPL(ucsi_resume); |
| /* -------------------------------------------------------------------------- */ |
| |
| void ucsi_altmode_update_active(struct ucsi_connector *con) |
| { |
| const struct typec_altmode *altmode = NULL; |
| u64 command; |
| int ret; |
| u8 cur; |
| int i; |
| |
| command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num); |
| ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur)); |
| if (ret < 0) { |
| if (con->ucsi->version > 0x0100) { |
| dev_err(con->ucsi->dev, |
| "GET_CURRENT_CAM command failed\n"); |
| return; |
| } |
| cur = 0xff; |
| } |
| |
| if (cur < UCSI_MAX_ALTMODES) |
| altmode = typec_altmode_get_partner(con->port_altmode[cur]); |
| |
| for (i = 0; con->partner_altmode[i]; i++) |
| typec_altmode_update_active(con->partner_altmode[i], |
| con->partner_altmode[i] == altmode); |
| } |
| |
| static int ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid) |
| { |
| u8 mode = 1; |
| int i; |
| |
| for (i = 0; alt[i]; i++) { |
| if (i > MODE_DISCOVERY_MAX) |
| return -ERANGE; |
| |
| if (alt[i]->svid == svid) |
| mode++; |
| } |
| |
| return mode; |
| } |
| |
| static int ucsi_next_altmode(struct typec_altmode **alt) |
| { |
| int i = 0; |
| |
| for (i = 0; i < UCSI_MAX_ALTMODES; i++) |
| if (!alt[i]) |
| return i; |
| |
| return -ENOENT; |
| } |
| |
| static int ucsi_register_altmode(struct ucsi_connector *con, |
| struct typec_altmode_desc *desc, |
| u8 recipient) |
| { |
| struct typec_altmode *alt; |
| bool override; |
| int ret; |
| int i; |
| |
| override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE); |
| |
| switch (recipient) { |
| case UCSI_RECIPIENT_CON: |
| i = ucsi_next_altmode(con->port_altmode); |
| if (i < 0) { |
| ret = i; |
| goto err; |
| } |
| |
| ret = ucsi_altmode_next_mode(con->port_altmode, desc->svid); |
| if (ret < 0) |
| return ret; |
| |
| desc->mode = ret; |
| |
| switch (desc->svid) { |
| case USB_TYPEC_DP_SID: |
| alt = ucsi_register_displayport(con, override, i, desc); |
| break; |
| case USB_TYPEC_NVIDIA_VLINK_SID: |
| if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO) |
| alt = typec_port_register_altmode(con->port, |
| desc); |
| else |
| alt = ucsi_register_displayport(con, override, |
| i, desc); |
| break; |
| default: |
| alt = typec_port_register_altmode(con->port, desc); |
| break; |
| } |
| |
| if (IS_ERR(alt)) { |
| ret = PTR_ERR(alt); |
| goto err; |
| } |
| |
| con->port_altmode[i] = alt; |
| break; |
| case UCSI_RECIPIENT_SOP: |
| i = ucsi_next_altmode(con->partner_altmode); |
| if (i < 0) { |
| ret = i; |
| goto err; |
| } |
| |
| ret = ucsi_altmode_next_mode(con->partner_altmode, desc->svid); |
| if (ret < 0) |
| return ret; |
| |
| desc->mode = ret; |
| |
| alt = typec_partner_register_altmode(con->partner, desc); |
| if (IS_ERR(alt)) { |
| ret = PTR_ERR(alt); |
| goto err; |
| } |
| |
| con->partner_altmode[i] = alt; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| trace_ucsi_register_altmode(recipient, alt); |
| |
| return 0; |
| |
| err: |
| dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n", |
| desc->svid, desc->mode); |
| |
| return ret; |
| } |
| |
| static int |
| ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient) |
| { |
| int max_altmodes = UCSI_MAX_ALTMODES; |
| struct typec_altmode_desc desc; |
| struct ucsi_altmode alt; |
| struct ucsi_altmode orig[UCSI_MAX_ALTMODES]; |
| struct ucsi_altmode updated[UCSI_MAX_ALTMODES]; |
| struct ucsi *ucsi = con->ucsi; |
| bool multi_dp = false; |
| u64 command; |
| int ret; |
| int len; |
| int i; |
| int k = 0; |
| |
| if (recipient == UCSI_RECIPIENT_CON) |
| max_altmodes = con->ucsi->cap.num_alt_modes; |
| |
| memset(orig, 0, sizeof(orig)); |
| memset(updated, 0, sizeof(updated)); |
| |
| /* First get all the alternate modes */ |
| for (i = 0; i < max_altmodes; i++) { |
| memset(&alt, 0, sizeof(alt)); |
| command = UCSI_GET_ALTERNATE_MODES; |
| command |= UCSI_GET_ALTMODE_RECIPIENT(recipient); |
| command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num); |
| command |= UCSI_GET_ALTMODE_OFFSET(i); |
| len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt)); |
| /* |
| * We are collecting all altmodes first and then registering. |
| * Some type-C device will return zero length data beyond last |
| * alternate modes. We should not return if length is zero. |
| */ |
| if (len < 0) |
| return len; |
| |
| /* We got all altmodes, now break out and register them */ |
| if (!len || !alt.svid) |
| break; |
| |
| orig[k].mid = alt.mid; |
| orig[k].svid = alt.svid; |
| k++; |
| } |
| /* |
| * Update the original altmode table as some ppms may report |
| * multiple DP altmodes. |
| */ |
| if (recipient == UCSI_RECIPIENT_CON) |
| multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated); |
| |
| /* now register altmodes */ |
| for (i = 0; i < max_altmodes; i++) { |
| memset(&desc, 0, sizeof(desc)); |
| if (multi_dp && recipient == UCSI_RECIPIENT_CON) { |
| desc.svid = updated[i].svid; |
| desc.vdo = updated[i].mid; |
| } else { |
| desc.svid = orig[i].svid; |
| desc.vdo = orig[i].mid; |
| } |
| desc.roles = TYPEC_PORT_DRD; |
| |
| if (!desc.svid) |
| return 0; |
| |
| ret = ucsi_register_altmode(con, &desc, recipient); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient) |
| { |
| int max_altmodes = UCSI_MAX_ALTMODES; |
| struct typec_altmode_desc desc; |
| struct ucsi_altmode alt[2]; |
| u64 command; |
| int num; |
| int ret; |
| int len; |
| int j; |
| int i; |
| |
| if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS)) |
| return 0; |
| |
| if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0]) |
| return 0; |
| |
| if (con->ucsi->ops->update_altmodes) |
| return ucsi_register_altmodes_nvidia(con, recipient); |
| |
| if (recipient == UCSI_RECIPIENT_CON) |
| max_altmodes = con->ucsi->cap.num_alt_modes; |
| |
| for (i = 0; i < max_altmodes;) { |
| memset(alt, 0, sizeof(alt)); |
| command = UCSI_GET_ALTERNATE_MODES; |
| command |= UCSI_GET_ALTMODE_RECIPIENT(recipient); |
| command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num); |
| command |= UCSI_GET_ALTMODE_OFFSET(i); |
| len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt)); |
| if (len <= 0) |
| return len; |
| |
| /* |
| * This code is requesting one alt mode at a time, but some PPMs |
| * may still return two. If that happens both alt modes need be |
| * registered and the offset for the next alt mode has to be |
| * incremented. |
| */ |
| num = len / sizeof(alt[0]); |
| i += num; |
| |
| for (j = 0; j < num; j++) { |
| if (!alt[j].svid) |
| return 0; |
| |
| memset(&desc, 0, sizeof(desc)); |
| desc.vdo = alt[j].mid; |
| desc.svid = alt[j].svid; |
| desc.roles = TYPEC_PORT_DRD; |
| |
| ret = ucsi_register_altmode(con, &desc, recipient); |
| if (ret) |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient) |
| { |
| const struct typec_altmode *pdev; |
| struct typec_altmode **adev; |
| int i = 0; |
| |
| switch (recipient) { |
| case UCSI_RECIPIENT_CON: |
| adev = con->port_altmode; |
| break; |
| case UCSI_RECIPIENT_SOP: |
| adev = con->partner_altmode; |
| break; |
| default: |
| return; |
| } |
| |
| while (adev[i]) { |
| if (recipient == UCSI_RECIPIENT_SOP && |
| (adev[i]->svid == USB_TYPEC_DP_SID || |
| (adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID && |
| adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) { |
| pdev = typec_altmode_get_partner(adev[i]); |
| ucsi_displayport_remove_partner((void *)pdev); |
| } |
| typec_unregister_altmode(adev[i]); |
| adev[i++] = NULL; |
| } |
| } |
| |
| static void ucsi_get_pdos(struct ucsi_connector *con, int is_partner) |
| { |
| struct ucsi *ucsi = con->ucsi; |
| u64 command; |
| int ret; |
| |
| command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num); |
| command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner); |
| command |= UCSI_GET_PDOS_NUM_PDOS(UCSI_MAX_PDOS - 1); |
| command |= UCSI_GET_PDOS_SRC_PDOS; |
| ret = ucsi_send_command(ucsi, command, con->src_pdos, |
| sizeof(con->src_pdos)); |
| if (ret < 0) { |
| dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret); |
| return; |
| } |
| con->num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */ |
| if (ret == 0) |
| dev_warn(ucsi->dev, "UCSI_GET_PDOS returned 0 bytes\n"); |
| } |
| |
| static void ucsi_pwr_opmode_change(struct ucsi_connector *con) |
| { |
| switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) { |
| case UCSI_CONSTAT_PWR_OPMODE_PD: |
| con->rdo = con->status.request_data_obj; |
| typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD); |
| ucsi_get_pdos(con, 1); |
| break; |
| case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5: |
| con->rdo = 0; |
| typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A); |
| break; |
| case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0: |
| con->rdo = 0; |
| typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A); |
| break; |
| default: |
| con->rdo = 0; |
| typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB); |
| break; |
| } |
| } |
| |
| static int ucsi_register_partner(struct ucsi_connector *con) |
| { |
| u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags); |
| struct typec_partner_desc desc; |
| struct typec_partner *partner; |
| |
| if (con->partner) |
| return 0; |
| |
| memset(&desc, 0, sizeof(desc)); |
| |
| switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { |
| case UCSI_CONSTAT_PARTNER_TYPE_DEBUG: |
| desc.accessory = TYPEC_ACCESSORY_DEBUG; |
| break; |
| case UCSI_CONSTAT_PARTNER_TYPE_AUDIO: |
| desc.accessory = TYPEC_ACCESSORY_AUDIO; |
| break; |
| default: |
| break; |
| } |
| |
| desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD; |
| |
| partner = typec_register_partner(con->port, &desc); |
| if (IS_ERR(partner)) { |
| dev_err(con->ucsi->dev, |
| "con%d: failed to register partner (%ld)\n", con->num, |
| PTR_ERR(partner)); |
| return PTR_ERR(partner); |
| } |
| |
| con->partner = partner; |
| |
| return 0; |
| } |
| |
| static void ucsi_unregister_partner(struct ucsi_connector *con) |
| { |
| if (!con->partner) |
| return; |
| |
| ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP); |
| typec_unregister_partner(con->partner); |
| con->partner = NULL; |
| } |
| |
| static void ucsi_partner_change(struct ucsi_connector *con) |
| { |
| int ret; |
| |
| if (!con->partner) |
| return; |
| |
| switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { |
| case UCSI_CONSTAT_PARTNER_TYPE_UFP: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_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; |
| } |
| |
| /* Complete pending data role swap */ |
| if (!completion_done(&con->complete)) |
| complete(&con->complete); |
| |
| /* Can't rely on Partner Flags field. Always checking the alt modes. */ |
| ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP); |
| if (ret) |
| dev_err(con->ucsi->dev, |
| "con%d: failed to register partner alternate modes\n", |
| con->num); |
| else |
| ucsi_altmode_update_active(con); |
| } |
| |
| static void ucsi_handle_connector_change(struct work_struct *work) |
| { |
| struct ucsi_connector *con = container_of(work, struct ucsi_connector, |
| work); |
| struct ucsi *ucsi = con->ucsi; |
| enum typec_role role; |
| u64 command; |
| int ret; |
| |
| mutex_lock(&con->lock); |
| |
| command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); |
| ret = ucsi_send_command(ucsi, command, &con->status, |
| sizeof(con->status)); |
| if (ret < 0) { |
| dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n", |
| __func__, ret); |
| goto out_unlock; |
| } |
| |
| role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); |
| |
| if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE || |
| con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE) |
| ucsi_pwr_opmode_change(con); |
| |
| if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) { |
| typec_set_pwr_role(con->port, role); |
| |
| /* Complete pending power role swap */ |
| if (!completion_done(&con->complete)) |
| complete(&con->complete); |
| } |
| |
| if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) { |
| typec_set_pwr_role(con->port, role); |
| |
| switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { |
| case UCSI_CONSTAT_PARTNER_TYPE_UFP: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_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; |
| } |
| |
| if (con->status.flags & UCSI_CONSTAT_CONNECTED) |
| ucsi_register_partner(con); |
| else |
| ucsi_unregister_partner(con); |
| } |
| |
| if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) { |
| /* |
| * We don't need to know the currently supported alt modes here. |
| * Running GET_CAM_SUPPORTED command just to make sure the PPM |
| * does not get stuck in case it assumes we do so. |
| */ |
| command = UCSI_GET_CAM_SUPPORTED; |
| command |= UCSI_CONNECTOR_NUMBER(con->num); |
| ucsi_send_command(con->ucsi, command, NULL, 0); |
| } |
| |
| if (con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) |
| ucsi_partner_change(con); |
| |
| ret = ucsi_acknowledge_connector_change(ucsi); |
| if (ret) |
| dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); |
| |
| trace_ucsi_connector_change(con->num, &con->status); |
| |
| out_unlock: |
| clear_bit(EVENT_PENDING, &ucsi->flags); |
| mutex_unlock(&con->lock); |
| } |
| |
| /** |
| * ucsi_connector_change - Process Connector Change Event |
| * @ucsi: UCSI Interface |
| * @num: Connector number |
| */ |
| void ucsi_connector_change(struct ucsi *ucsi, u8 num) |
| { |
| struct ucsi_connector *con = &ucsi->connector[num - 1]; |
| |
| if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) { |
| dev_dbg(ucsi->dev, "Bogus connector change event\n"); |
| return; |
| } |
| |
| if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags)) |
| schedule_work(&con->work); |
| } |
| EXPORT_SYMBOL_GPL(ucsi_connector_change); |
| |
| /* -------------------------------------------------------------------------- */ |
| |
| static int ucsi_reset_connector(struct ucsi_connector *con, bool hard) |
| { |
| u64 command; |
| |
| command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num); |
| command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0; |
| |
| return ucsi_send_command(con->ucsi, command, NULL, 0); |
| } |
| |
| static int ucsi_reset_ppm(struct ucsi *ucsi) |
| { |
| u64 command = UCSI_PPM_RESET; |
| unsigned long tmo; |
| u32 cci; |
| int ret; |
| |
| mutex_lock(&ucsi->ppm_lock); |
| |
| ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command, |
| sizeof(command)); |
| if (ret < 0) |
| goto out; |
| |
| tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS); |
| |
| do { |
| if (time_is_before_jiffies(tmo)) { |
| ret = -ETIMEDOUT; |
| goto out; |
| } |
| |
| ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); |
| if (ret) |
| goto out; |
| |
| /* If the PPM is still doing something else, reset it again. */ |
| if (cci & ~UCSI_CCI_RESET_COMPLETE) { |
| ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, |
| &command, |
| sizeof(command)); |
| if (ret < 0) |
| goto out; |
| } |
| |
| msleep(20); |
| } while (!(cci & UCSI_CCI_RESET_COMPLETE)); |
| |
| out: |
| mutex_unlock(&ucsi->ppm_lock); |
| return ret; |
| } |
| |
| static int ucsi_role_cmd(struct ucsi_connector *con, u64 command) |
| { |
| int ret; |
| |
| ret = ucsi_send_command(con->ucsi, command, NULL, 0); |
| if (ret == -ETIMEDOUT) { |
| u64 c; |
| |
| /* PPM most likely stopped responding. Resetting everything. */ |
| ucsi_reset_ppm(con->ucsi); |
| |
| c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy; |
| ucsi_send_command(con->ucsi, c, NULL, 0); |
| |
| ucsi_reset_connector(con, true); |
| } |
| |
| return ret; |
| } |
| |
| static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role) |
| { |
| struct ucsi_connector *con = typec_get_drvdata(port); |
| u8 partner_type; |
| u64 command; |
| int ret = 0; |
| |
| mutex_lock(&con->lock); |
| |
| if (!con->partner) { |
| ret = -ENOTCONN; |
| goto out_unlock; |
| } |
| |
| partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags); |
| if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP && |
| role == TYPEC_DEVICE) || |
| (partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP && |
| role == TYPEC_HOST)) |
| goto out_unlock; |
| |
| command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num); |
| command |= UCSI_SET_UOR_ROLE(role); |
| command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS; |
| ret = ucsi_role_cmd(con, command); |
| if (ret < 0) |
| goto out_unlock; |
| |
| if (!wait_for_completion_timeout(&con->complete, |
| msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) |
| ret = -ETIMEDOUT; |
| |
| out_unlock: |
| mutex_unlock(&con->lock); |
| |
| return ret < 0 ? ret : 0; |
| } |
| |
| static int ucsi_pr_swap(struct typec_port *port, enum typec_role role) |
| { |
| struct ucsi_connector *con = typec_get_drvdata(port); |
| enum typec_role cur_role; |
| u64 command; |
| int ret = 0; |
| |
| mutex_lock(&con->lock); |
| |
| if (!con->partner) { |
| ret = -ENOTCONN; |
| goto out_unlock; |
| } |
| |
| cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); |
| |
| if (cur_role == role) |
| goto out_unlock; |
| |
| command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num); |
| command |= UCSI_SET_PDR_ROLE(role); |
| command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS; |
| ret = ucsi_role_cmd(con, command); |
| if (ret < 0) |
| goto out_unlock; |
| |
| if (!wait_for_completion_timeout(&con->complete, |
| msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) { |
| ret = -ETIMEDOUT; |
| goto out_unlock; |
| } |
| |
| /* Something has gone wrong while swapping the role */ |
| if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) != |
| UCSI_CONSTAT_PWR_OPMODE_PD) { |
| ucsi_reset_connector(con, true); |
| ret = -EPROTO; |
| } |
| |
| out_unlock: |
| mutex_unlock(&con->lock); |
| |
| return ret; |
| } |
| |
| static const struct typec_operations ucsi_ops = { |
| .dr_set = ucsi_dr_swap, |
| .pr_set = ucsi_pr_swap |
| }; |
| |
| 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; |
| u64 command; |
| int ret; |
| |
| INIT_WORK(&con->work, ucsi_handle_connector_change); |
| init_completion(&con->complete); |
| mutex_init(&con->lock); |
| con->num = index + 1; |
| con->ucsi = ucsi; |
| |
| /* Delay other interactions with the con until registration is complete */ |
| mutex_lock(&con->lock); |
| |
| /* Get connector capability */ |
| command = UCSI_GET_CONNECTOR_CAPABILITY; |
| command |= UCSI_CONNECTOR_NUMBER(con->num); |
| ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap)); |
| if (ret < 0) |
| goto out; |
| |
| if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP) |
| cap->data = TYPEC_PORT_DRD; |
| else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP) |
| cap->data = TYPEC_PORT_DFP; |
| else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP) |
| cap->data = TYPEC_PORT_UFP; |
| |
| if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) && |
| (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)) |
| cap->type = TYPEC_PORT_DRP; |
| else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) |
| cap->type = TYPEC_PORT_SRC; |
| else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER) |
| cap->type = TYPEC_PORT_SNK; |
| |
| 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->driver_data = con; |
| cap->ops = &ucsi_ops; |
| |
| ret = ucsi_register_port_psy(con); |
| if (ret) |
| goto out; |
| |
| /* Register the connector */ |
| con->port = typec_register_port(ucsi->dev, cap); |
| if (IS_ERR(con->port)) { |
| ret = PTR_ERR(con->port); |
| goto out; |
| } |
| |
| /* Alternate modes */ |
| ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON); |
| if (ret) { |
| dev_err(ucsi->dev, "con%d: failed to register alt modes\n", |
| con->num); |
| goto out; |
| } |
| |
| /* Get the status */ |
| command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); |
| ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); |
| if (ret < 0) { |
| dev_err(ucsi->dev, "con%d: failed to get status\n", con->num); |
| ret = 0; |
| goto out; |
| } |
| ret = 0; /* ucsi_send_command() returns length on success */ |
| |
| switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { |
| case UCSI_CONSTAT_PARTNER_TYPE_UFP: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE: |
| case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_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.flags & UCSI_CONSTAT_CONNECTED) { |
| typec_set_pwr_role(con->port, |
| !!(con->status.flags & UCSI_CONSTAT_PWR_DIR)); |
| ucsi_pwr_opmode_change(con); |
| ucsi_register_partner(con); |
| } |
| |
| if (con->partner) { |
| ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP); |
| if (ret) { |
| dev_err(ucsi->dev, |
| "con%d: failed to register alternate modes\n", |
| con->num); |
| ret = 0; |
| } else { |
| ucsi_altmode_update_active(con); |
| } |
| } |
| |
| trace_ucsi_register_port(con->num, &con->status); |
| |
| out: |
| mutex_unlock(&con->lock); |
| return ret; |
| } |
| |
| /** |
| * ucsi_init - Initialize UCSI interface |
| * @ucsi: UCSI to be initialized |
| * |
| * Registers all ports @ucsi has and enables all notification events. |
| */ |
| static int ucsi_init(struct ucsi *ucsi) |
| { |
| struct ucsi_connector *con; |
| u64 command; |
| int ret; |
| int i; |
| |
| /* 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->ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR; |
| command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; |
| ret = ucsi_send_command(ucsi, command, NULL, 0); |
| if (ret < 0) |
| goto err_reset; |
| |
| /* Get PPM capabilities */ |
| command = UCSI_GET_CAPABILITY; |
| ret = ucsi_send_command(ucsi, command, &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->ntfy = UCSI_ENABLE_NTFY_ALL; |
| command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; |
| ret = ucsi_send_command(ucsi, command, NULL, 0); |
| if (ret < 0) |
| goto err_unregister; |
| |
| return 0; |
| |
| err_unregister: |
| for (con = ucsi->connector; con->port; con++) { |
| ucsi_unregister_partner(con); |
| ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON); |
| ucsi_unregister_port_psy(con); |
| typec_unregister_port(con->port); |
| con->port = NULL; |
| } |
| |
| err_reset: |
| ucsi_reset_ppm(ucsi); |
| err: |
| return ret; |
| } |
| |
| static void ucsi_init_work(struct work_struct *work) |
| { |
| struct ucsi *ucsi = container_of(work, struct ucsi, work); |
| int ret; |
| |
| ret = ucsi_init(ucsi); |
| if (ret) |
| dev_err(ucsi->dev, "PPM init failed (%d)\n", ret); |
| } |
| |
| /** |
| * ucsi_get_drvdata - Return private driver data pointer |
| * @ucsi: UCSI interface |
| */ |
| void *ucsi_get_drvdata(struct ucsi *ucsi) |
| { |
| return ucsi->driver_data; |
| } |
| EXPORT_SYMBOL_GPL(ucsi_get_drvdata); |
| |
| /** |
| * ucsi_get_drvdata - Assign private driver data pointer |
| * @ucsi: UCSI interface |
| * @data: Private data pointer |
| */ |
| void ucsi_set_drvdata(struct ucsi *ucsi, void *data) |
| { |
| ucsi->driver_data = data; |
| } |
| EXPORT_SYMBOL_GPL(ucsi_set_drvdata); |
| |
| /** |
| * ucsi_create - Allocate UCSI instance |
| * @dev: Device interface to the PPM (Platform Policy Manager) |
| * @ops: I/O routines |
| */ |
| struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops) |
| { |
| struct ucsi *ucsi; |
| |
| if (!ops || !ops->read || !ops->sync_write || !ops->async_write) |
| return ERR_PTR(-EINVAL); |
| |
| ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL); |
| if (!ucsi) |
| return ERR_PTR(-ENOMEM); |
| |
| INIT_WORK(&ucsi->work, ucsi_init_work); |
| mutex_init(&ucsi->ppm_lock); |
| ucsi->dev = dev; |
| ucsi->ops = ops; |
| |
| return ucsi; |
| } |
| EXPORT_SYMBOL_GPL(ucsi_create); |
| |
| /** |
| * ucsi_destroy - Free UCSI instance |
| * @ucsi: UCSI instance to be freed |
| */ |
| void ucsi_destroy(struct ucsi *ucsi) |
| { |
| kfree(ucsi); |
| } |
| EXPORT_SYMBOL_GPL(ucsi_destroy); |
| |
| /** |
| * ucsi_register - Register UCSI interface |
| * @ucsi: UCSI instance |
| */ |
| int ucsi_register(struct ucsi *ucsi) |
| { |
| int ret; |
| |
| ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version, |
| sizeof(ucsi->version)); |
| if (ret) |
| return ret; |
| |
| if (!ucsi->version) |
| return -ENODEV; |
| |
| queue_work(system_long_wq, &ucsi->work); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(ucsi_register); |
| |
| /** |
| * ucsi_unregister - Unregister UCSI interface |
| * @ucsi: UCSI interface to be unregistered |
| * |
| * Unregister UCSI interface that was created with ucsi_register(). |
| */ |
| void ucsi_unregister(struct ucsi *ucsi) |
| { |
| u64 cmd = UCSI_SET_NOTIFICATION_ENABLE; |
| int i; |
| |
| /* Make sure that we are not in the middle of driver initialization */ |
| cancel_work_sync(&ucsi->work); |
| |
| /* Disable notifications */ |
| ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); |
| |
| for (i = 0; i < ucsi->cap.num_connectors; i++) { |
| cancel_work_sync(&ucsi->connector[i].work); |
| ucsi_unregister_partner(&ucsi->connector[i]); |
| ucsi_unregister_altmodes(&ucsi->connector[i], |
| UCSI_RECIPIENT_CON); |
| ucsi_unregister_port_psy(&ucsi->connector[i]); |
| typec_unregister_port(ucsi->connector[i].port); |
| } |
| |
| kfree(ucsi->connector); |
| } |
| EXPORT_SYMBOL_GPL(ucsi_unregister); |
| |
| MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver"); |