diff options
Diffstat (limited to 'drivers/usb/typec/ucsi/ucsi.c')
| -rw-r--r-- | drivers/usb/typec/ucsi/ucsi.c | 1460 |
1 files changed, 1460 insertions, 0 deletions
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c new file mode 100644 index 000000000..dc2dea376 --- /dev/null +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -0,0 +1,1460 @@ +// 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->sync_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; + + /* Acknowledge 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; + + ret = ucsi_acknowledge_command(ucsi); + 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 (cmd != UCSI_CANCEL && cci & UCSI_CCI_BUSY) + return ucsi_exec_command(ucsi, UCSI_CANCEL); + + 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); + } + + if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) { + ret = ucsi_acknowledge_command(ucsi); + return ret ? ret : -EBUSY; + } + + 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); + +/* -------------------------------------------------------------------------- */ + +struct ucsi_work { + struct delayed_work work; + struct list_head node; + unsigned long delay; + unsigned int count; + struct ucsi_connector *con; + int (*cb)(struct ucsi_connector *); +}; + +static void ucsi_poll_worker(struct work_struct *work) +{ + struct ucsi_work *uwork = container_of(work, struct ucsi_work, work.work); + struct ucsi_connector *con = uwork->con; + int ret; + + mutex_lock(&con->lock); + + if (!con->partner) { + list_del(&uwork->node); + mutex_unlock(&con->lock); + kfree(uwork); + return; + } + + ret = uwork->cb(con); + + if (uwork->count-- && (ret == -EBUSY || ret == -ETIMEDOUT)) { + queue_delayed_work(con->wq, &uwork->work, uwork->delay); + } else { + list_del(&uwork->node); + kfree(uwork); + } + + mutex_unlock(&con->lock); +} + +static int ucsi_partner_task(struct ucsi_connector *con, + int (*cb)(struct ucsi_connector *), + int retries, unsigned long delay) +{ + struct ucsi_work *uwork; + + if (!con->partner) + return 0; + + uwork = kzalloc(sizeof(*uwork), GFP_KERNEL); + if (!uwork) + return -ENOMEM; + + INIT_DELAYED_WORK(&uwork->work, ucsi_poll_worker); + uwork->count = retries; + uwork->delay = delay; + uwork->con = con; + uwork->cb = cb; + + list_add_tail(&uwork->node, &con->partner_tasks); + queue_delayed_work(con->wq, &uwork->work, delay); + + return 0; +} + +/* -------------------------------------------------------------------------- */ + +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_get_num_altmode(struct typec_altmode **alt) +{ + int i; + + for (i = 0; i < UCSI_MAX_ALTMODES; i++) + if (!alt[i]) + break; + + return i; +} + +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 == -EBUSY) + continue; + 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 int ucsi_get_pdos(struct ucsi_connector *con, int is_partner, + u32 *pdos, int offset, int num_pdos) +{ + 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_PDO_OFFSET(offset); + command |= UCSI_GET_PDOS_NUM_PDOS(num_pdos - 1); + command |= UCSI_GET_PDOS_SRC_PDOS; + ret = ucsi_send_command(ucsi, command, pdos + offset, + num_pdos * sizeof(u32)); + if (ret < 0 && ret != -ETIMEDOUT) + dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret); + + return ret; +} + +static int ucsi_get_src_pdos(struct ucsi_connector *con) +{ + int ret; + + /* UCSI max payload means only getting at most 4 PDOs at a time */ + ret = ucsi_get_pdos(con, 1, con->src_pdos, 0, UCSI_MAX_PDOS); + if (ret < 0) + return ret; + + con->num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */ + if (con->num_pdos < UCSI_MAX_PDOS) + return 0; + + /* get the remaining PDOs, if any */ + ret = ucsi_get_pdos(con, 1, con->src_pdos, UCSI_MAX_PDOS, + PDO_MAX_OBJECTS - UCSI_MAX_PDOS); + if (ret < 0) + return ret; + + con->num_pdos += ret / sizeof(u32); + + ucsi_port_psy_changed(con); + + return 0; +} + +static int ucsi_check_altmodes(struct ucsi_connector *con) +{ + int ret, num_partner_am; + + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP); + if (ret && ret != -ETIMEDOUT) + dev_err(con->ucsi->dev, + "con%d: failed to register partner alt modes (%d)\n", + con->num, ret); + + /* Ignoring the errors in this case. */ + if (con->partner_altmode[0]) { + num_partner_am = ucsi_get_num_altmode(con->partner_altmode); + if (num_partner_am > 0) + typec_partner_set_num_altmodes(con->partner, num_partner_am); + ucsi_altmode_update_active(con); + return 0; + } + + return ret; +} + +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_partner_task(con, ucsi_get_src_pdos, 30, 0); + ucsi_partner_task(con, ucsi_check_altmodes, 30, 0); + 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) +{ + enum usb_role u_role = USB_ROLE_NONE; + int ret; + + switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { + case UCSI_CONSTAT_PARTNER_TYPE_UFP: + case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP: + u_role = USB_ROLE_HOST; + fallthrough; + case UCSI_CONSTAT_PARTNER_TYPE_CABLE: + typec_set_data_role(con->port, TYPEC_HOST); + break; + case UCSI_CONSTAT_PARTNER_TYPE_DFP: + u_role = USB_ROLE_DEVICE; + typec_set_data_role(con->port, TYPEC_DEVICE); + break; + default: + break; + } + + /* Only notify USB controller if partner supports USB data */ + if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) + u_role = USB_ROLE_NONE; + + ret = usb_role_switch_set_role(con->usb_role_sw, u_role); + if (ret) + dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n", + con->num, u_role); +} + +static int ucsi_check_connection(struct ucsi_connector *con) +{ + u8 prev_flags = con->status.flags; + u64 command; + int ret; + + command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); + ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status)); + if (ret < 0) { + dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret); + return ret; + } + + if (con->status.flags == prev_flags) + return 0; + + if (con->status.flags & UCSI_CONSTAT_CONNECTED) { + ucsi_register_partner(con); + ucsi_pwr_opmode_change(con); + ucsi_partner_change(con); + } else { + ucsi_partner_change(con); + ucsi_port_psy_changed(con); + ucsi_unregister_partner(con); + } + + return 0; +} + +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); + clear_bit(EVENT_PENDING, &con->ucsi->flags); + goto out_unlock; + } + + trace_ucsi_connector_change(con->num, &con->status); + + role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); + + 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); + ucsi_port_psy_changed(con); + ucsi_partner_change(con); + + if (con->status.flags & UCSI_CONSTAT_CONNECTED) { + ucsi_register_partner(con); + ucsi_partner_task(con, ucsi_check_connection, 1, HZ); + } else { + ucsi_unregister_partner(con); + } + } + + if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE || + con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE) + ucsi_pwr_opmode_change(con); + + if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) { + ucsi_partner_change(con); + + /* Complete pending data role swap */ + if (!completion_done(&con->complete)) + complete(&con->complete); + } + + if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) + ucsi_partner_task(con, ucsi_check_altmodes, 1, 0); + + clear_bit(EVENT_PENDING, &con->ucsi->flags); + + ret = ucsi_acknowledge_connector_change(ucsi); + if (ret) + dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); + +out_unlock: + 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; + + reinit_completion(&con->complete); + + 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; + + mutex_unlock(&con->lock); + + if (!wait_for_completion_timeout(&con->complete, + msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) + return -ETIMEDOUT; + + return 0; + +out_unlock: + mutex_unlock(&con->lock); + + return ret; +} + +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; + + reinit_completion(&con->complete); + + 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; + + mutex_unlock(&con->lock); + + if (!wait_for_completion_timeout(&con->complete, + msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) + return -ETIMEDOUT; + + mutex_lock(&con->lock); + + /* 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 +}; + +/* Caller must call fwnode_handle_put() after use */ +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, struct ucsi_connector *con) +{ + struct typec_capability *cap = &con->typec_cap; + enum typec_accessory *accessory = cap->accessory; + enum usb_role u_role = USB_ROLE_NONE; + u64 command; + char *name; + int ret; + + name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num); + if (!name) + return -ENOMEM; + + con->wq = create_singlethread_workqueue(name); + kfree(name); + if (!con->wq) + return -ENOMEM; + + INIT_WORK(&con->work, ucsi_handle_connector_change); + init_completion(&con->complete); + mutex_init(&con->lock); + INIT_LIST_HEAD(&con->partner_tasks); + con->ucsi = ucsi; + + cap->fwnode = ucsi_find_fwnode(con); + con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode); + if (IS_ERR(con->usb_role_sw)) + return dev_err_probe(ucsi->dev, PTR_ERR(con->usb_role_sw), + "con%d: failed to get usb role switch\n", con->num); + + /* 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_unlock; + + 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->svdm_version = SVDM_VER_2_0; + 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->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_AND_UFP: + u_role = USB_ROLE_HOST; + fallthrough; + case UCSI_CONSTAT_PARTNER_TYPE_CABLE: + typec_set_data_role(con->port, TYPEC_HOST); + break; + case UCSI_CONSTAT_PARTNER_TYPE_DFP: + u_role = USB_ROLE_DEVICE; + 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); + ucsi_port_psy_changed(con); + } + + /* Only notify USB controller if partner supports USB data */ + if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) + u_role = USB_ROLE_NONE; + + ret = usb_role_switch_set_role(con->usb_role_sw, u_role); + if (ret) { + dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n", + con->num, u_role); + ret = 0; + } + + if (con->partner && + UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == + UCSI_CONSTAT_PWR_OPMODE_PD) { + ucsi_get_src_pdos(con); + ucsi_check_altmodes(con); + } + + trace_ucsi_register_port(con->num, &con->status); + +out: + fwnode_handle_put(cap->fwnode); +out_unlock: + mutex_unlock(&con->lock); + + if (ret && con->wq) { + destroy_workqueue(con->wq); + con->wq = NULL; + } + + 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, *connector; + u64 command, ntfy; + 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 */ + ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR; + command = UCSI_SET_NOTIFICATION_ENABLE | 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() */ + connector = kcalloc(ucsi->cap.num_connectors + 1, sizeof(*connector), GFP_KERNEL); + if (!connector) { + ret = -ENOMEM; + goto err_reset; + } + + /* Register all connectors */ + for (i = 0; i < ucsi->cap.num_connectors; i++) { + connector[i].num = i + 1; + ret = ucsi_register_port(ucsi, &connector[i]); + if (ret) + goto err_unregister; + } + + /* Enable all notifications */ + ntfy = UCSI_ENABLE_NTFY_ALL; + command = UCSI_SET_NOTIFICATION_ENABLE | ntfy; + ret = ucsi_send_command(ucsi, command, NULL, 0); + if (ret < 0) + goto err_unregister; + + ucsi->connector = connector; + ucsi->ntfy = ntfy; + return 0; + +err_unregister: + for (con = connector; con->port; con++) { + ucsi_unregister_partner(con); + ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON); + ucsi_unregister_port_psy(con); + if (con->wq) + destroy_workqueue(con->wq); + typec_unregister_port(con->port); + con->port = NULL; + } + kfree(connector); +err_reset: + memset(&ucsi->cap, 0, sizeof(ucsi->cap)); + ucsi_reset_ppm(ucsi); +err: + return ret; +} + +static void ucsi_resume_work(struct work_struct *work) +{ + struct ucsi *ucsi = container_of(work, struct ucsi, resume_work); + struct ucsi_connector *con; + u64 command; + int ret; + + /* Restore UCSI notification enable mask after system resume */ + command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; + ret = ucsi_send_command(ucsi, command, NULL, 0); + if (ret < 0) { + dev_err(ucsi->dev, "failed to re-enable notifications (%d)\n", ret); + return; + } + + for (con = ucsi->connector; con->port; con++) { + mutex_lock(&con->lock); + ucsi_partner_task(con, ucsi_check_connection, 1, 0); + mutex_unlock(&con->lock); + } +} + +int ucsi_resume(struct ucsi *ucsi) +{ + if (ucsi->connector) + queue_work(system_long_wq, &ucsi->resume_work); + return 0; +} +EXPORT_SYMBOL_GPL(ucsi_resume); + +static void ucsi_init_work(struct work_struct *work) +{ + struct ucsi *ucsi = container_of(work, struct ucsi, work.work); + int ret; + + ret = ucsi_init(ucsi); + if (ret) + dev_err(ucsi->dev, "PPM init failed (%d)\n", ret); + + if (ret == -EPROBE_DEFER) { + if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) + return; + + queue_delayed_work(system_long_wq, &ucsi->work, + UCSI_ROLE_SWITCH_INTERVAL); + } +} + +/** + * 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_set_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->resume_work, ucsi_resume_work); + INIT_DELAYED_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_delayed_work(system_long_wq, &ucsi->work, 0); + + 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_delayed_work_sync(&ucsi->work); + cancel_work_sync(&ucsi->resume_work); + + /* Disable notifications */ + ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); + + if (!ucsi->connector) + return; + + 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]); + + if (ucsi->connector[i].wq) { + struct ucsi_work *uwork; + + mutex_lock(&ucsi->connector[i].lock); + /* + * queue delayed items immediately so they can execute + * and free themselves before the wq is destroyed + */ + list_for_each_entry(uwork, &ucsi->connector[i].partner_tasks, node) + mod_delayed_work(ucsi->connector[i].wq, &uwork->work, 0); + mutex_unlock(&ucsi->connector[i].lock); + destroy_workqueue(ucsi->connector[i].wq); + } + 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"); |