// SPDX-License-Identifier: GPL-2.0+ /* * Power supply driver for ChromeOS EC based USB PD Charger. * * Copyright (c) 2014 - 2018 Google, Inc */ #include <linux/module.h> #include <linux/platform_data/cros_ec_commands.h> #include <linux/platform_data/cros_ec_proto.h> #include <linux/platform_data/cros_usbpd_notify.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/slab.h> #define CHARGER_USBPD_DIR_NAME "CROS_USBPD_CHARGER%d" #define CHARGER_DEDICATED_DIR_NAME "CROS_DEDICATED_CHARGER" #define CHARGER_DIR_NAME_LENGTH (sizeof(CHARGER_USBPD_DIR_NAME) >= \ sizeof(CHARGER_DEDICATED_DIR_NAME) ? \ sizeof(CHARGER_USBPD_DIR_NAME) : \ sizeof(CHARGER_DEDICATED_DIR_NAME)) #define CHARGER_CACHE_UPDATE_DELAY msecs_to_jiffies(500) #define CHARGER_MANUFACTURER_MODEL_LENGTH 32 #define DRV_NAME "cros-usbpd-charger" struct port_data { int port_number; char name[CHARGER_DIR_NAME_LENGTH]; char manufacturer[CHARGER_MANUFACTURER_MODEL_LENGTH]; char model_name[CHARGER_MANUFACTURER_MODEL_LENGTH]; struct power_supply *psy; struct power_supply_desc psy_desc; int psy_usb_type; int psy_online; int psy_status; int psy_current_max; int psy_voltage_max_design; int psy_voltage_now; int psy_power_max; struct charger_data *charger; unsigned long last_update; }; struct charger_data { struct device *dev; struct cros_ec_dev *ec_dev; struct cros_ec_device *ec_device; int num_charger_ports; int num_usbpd_ports; int num_registered_psy; struct port_data *ports[EC_USB_PD_MAX_PORTS]; struct notifier_block notifier; }; static enum power_supply_property cros_usbpd_charger_props[] = { POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CURRENT_MAX, POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER, POWER_SUPPLY_PROP_USB_TYPE }; static enum power_supply_property cros_usbpd_dedicated_charger_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; static enum power_supply_usb_type cros_usbpd_charger_usb_types[] = { POWER_SUPPLY_USB_TYPE_UNKNOWN, POWER_SUPPLY_USB_TYPE_SDP, POWER_SUPPLY_USB_TYPE_DCP, POWER_SUPPLY_USB_TYPE_CDP, POWER_SUPPLY_USB_TYPE_C, POWER_SUPPLY_USB_TYPE_PD, POWER_SUPPLY_USB_TYPE_PD_DRP, POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID }; /* Input voltage/current limit in mV/mA. Default to none. */ static u16 input_voltage_limit = EC_POWER_LIMIT_NONE; static u16 input_current_limit = EC_POWER_LIMIT_NONE; static bool cros_usbpd_charger_port_is_dedicated(struct port_data *port) { return port->port_number >= port->charger->num_usbpd_ports; } static int cros_usbpd_charger_ec_command(struct charger_data *charger, unsigned int version, unsigned int command, void *outdata, unsigned int outsize, void *indata, unsigned int insize) { struct cros_ec_dev *ec_dev = charger->ec_dev; struct cros_ec_command *msg; int ret; msg = kzalloc(struct_size(msg, data, max(outsize, insize)), GFP_KERNEL); if (!msg) return -ENOMEM; msg->version = version; msg->command = ec_dev->cmd_offset + command; msg->outsize = outsize; msg->insize = insize; if (outsize) memcpy(msg->data, outdata, outsize); ret = cros_ec_cmd_xfer_status(charger->ec_device, msg); if (ret >= 0 && insize) memcpy(indata, msg->data, insize); kfree(msg); return ret; } static int cros_usbpd_charger_get_num_ports(struct charger_data *charger) { struct ec_response_charge_port_count resp; int ret; ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_CHARGE_PORT_COUNT, NULL, 0, &resp, sizeof(resp)); if (ret < 0) return ret; return resp.port_count; } static int cros_usbpd_charger_get_usbpd_num_ports(struct charger_data *charger) { struct ec_response_usb_pd_ports resp; int ret; ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_USB_PD_PORTS, NULL, 0, &resp, sizeof(resp)); if (ret < 0) return ret; return resp.num_ports; } static int cros_usbpd_charger_get_discovery_info(struct port_data *port) { struct charger_data *charger = port->charger; struct ec_params_usb_pd_discovery_entry resp; struct ec_params_usb_pd_info_request req; int ret; req.port = port->port_number; ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_USB_PD_DISCOVERY, &req, sizeof(req), &resp, sizeof(resp)); if (ret < 0) { dev_err(charger->dev, "Unable to query discovery info (err:0x%x)\n", ret); return ret; } dev_dbg(charger->dev, "Port %d: VID = 0x%x, PID=0x%x, PTYPE=0x%x\n", port->port_number, resp.vid, resp.pid, resp.ptype); snprintf(port->manufacturer, sizeof(port->manufacturer), "%x", resp.vid); snprintf(port->model_name, sizeof(port->model_name), "%x", resp.pid); return 0; } static int cros_usbpd_charger_get_power_info(struct port_data *port) { struct charger_data *charger = port->charger; struct ec_response_usb_pd_power_info resp; struct ec_params_usb_pd_power_info req; int last_psy_status, last_psy_usb_type; struct device *dev = charger->dev; int ret; req.port = port->port_number; ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_USB_PD_POWER_INFO, &req, sizeof(req), &resp, sizeof(resp)); if (ret < 0) { dev_err(dev, "Unable to query PD power info (err:0x%x)\n", ret); return ret; } last_psy_status = port->psy_status; last_psy_usb_type = port->psy_usb_type; switch (resp.role) { case USB_PD_PORT_POWER_DISCONNECTED: port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; port->psy_online = 0; break; case USB_PD_PORT_POWER_SOURCE: port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; port->psy_online = 0; break; case USB_PD_PORT_POWER_SINK: port->psy_status = POWER_SUPPLY_STATUS_CHARGING; port->psy_online = 1; break; case USB_PD_PORT_POWER_SINK_NOT_CHARGING: port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; port->psy_online = 1; break; default: dev_err(dev, "Unknown role %d\n", resp.role); break; } port->psy_voltage_max_design = resp.meas.voltage_max; port->psy_voltage_now = resp.meas.voltage_now; port->psy_current_max = resp.meas.current_max; port->psy_power_max = resp.max_power; switch (resp.type) { case USB_CHG_TYPE_BC12_SDP: case USB_CHG_TYPE_VBUS: port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP; break; case USB_CHG_TYPE_NONE: /* * For dual-role devices when we are a source, the firmware * reports the type as NONE. Report such chargers as type * USB_PD_DRP. */ if (resp.role == USB_PD_PORT_POWER_SOURCE && resp.dualrole) port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP; else port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP; break; case USB_CHG_TYPE_OTHER: case USB_CHG_TYPE_PROPRIETARY: port->psy_usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID; break; case USB_CHG_TYPE_C: port->psy_usb_type = POWER_SUPPLY_USB_TYPE_C; break; case USB_CHG_TYPE_BC12_DCP: port->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP; break; case USB_CHG_TYPE_BC12_CDP: port->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP; break; case USB_CHG_TYPE_PD: if (resp.dualrole) port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP; else port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD; break; case USB_CHG_TYPE_UNKNOWN: /* * While the EC is trying to determine the type of charger that * has been plugged in, it will report the charger type as * unknown. Additionally since the power capabilities are * unknown, report the max current and voltage as zero. */ port->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN; port->psy_voltage_max_design = 0; port->psy_current_max = 0; break; default: dev_dbg(dev, "Port %d: default case!\n", port->port_number); port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP; } if (cros_usbpd_charger_port_is_dedicated(port)) port->psy_desc.type = POWER_SUPPLY_TYPE_MAINS; else port->psy_desc.type = POWER_SUPPLY_TYPE_USB; dev_dbg(dev, "Port %d: type=%d vmax=%d vnow=%d cmax=%d clim=%d pmax=%d\n", port->port_number, resp.type, resp.meas.voltage_max, resp.meas.voltage_now, resp.meas.current_max, resp.meas.current_lim, resp.max_power); /* * If power supply type or status changed, explicitly call * power_supply_changed. This results in udev event getting generated * and allows user mode apps to react quicker instead of waiting for * their next poll of power supply status. */ if (last_psy_usb_type != port->psy_usb_type || last_psy_status != port->psy_status) power_supply_changed(port->psy); return 0; } static int cros_usbpd_charger_get_port_status(struct port_data *port, bool ratelimit) { int ret; if (ratelimit && time_is_after_jiffies(port->last_update + CHARGER_CACHE_UPDATE_DELAY)) return 0; ret = cros_usbpd_charger_get_power_info(port); if (ret < 0) return ret; if (!cros_usbpd_charger_port_is_dedicated(port)) ret = cros_usbpd_charger_get_discovery_info(port); port->last_update = jiffies; return ret; } static int cros_usbpd_charger_set_ext_power_limit(struct charger_data *charger, u16 current_lim, u16 voltage_lim) { struct ec_params_external_power_limit_v1 req; int ret; req.current_lim = current_lim; req.voltage_lim = voltage_lim; ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_EXTERNAL_POWER_LIMIT, &req, sizeof(req), NULL, 0); if (ret < 0) dev_err(charger->dev, "Unable to set the 'External Power Limit': %d\n", ret); return ret; } static void cros_usbpd_charger_power_changed(struct power_supply *psy) { struct port_data *port = power_supply_get_drvdata(psy); struct charger_data *charger = port->charger; int i; for (i = 0; i < charger->num_registered_psy; i++) cros_usbpd_charger_get_port_status(charger->ports[i], false); } static int cros_usbpd_charger_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct port_data *port = power_supply_get_drvdata(psy); struct charger_data *charger = port->charger; struct cros_ec_device *ec_device = charger->ec_device; struct device *dev = charger->dev; int ret; /* Only refresh ec_port_status for dynamic properties */ switch (psp) { case POWER_SUPPLY_PROP_ONLINE: /* * If mkbp_event_supported, then we can be assured that * the driver's state for the online property is consistent * with the hardware. However, if we aren't event driven, * the optimization before to skip an ec_port_status get * and only returned cached values of the online property will * cause a delay in detecting a cable attach until one of the * other properties are read. * * Allow an ec_port_status refresh for online property check * if we're not already online to check for plug events if * not mkbp_event_supported. */ if (ec_device->mkbp_event_supported || port->psy_online) break; fallthrough; case POWER_SUPPLY_PROP_CURRENT_MAX: case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = cros_usbpd_charger_get_port_status(port, true); if (ret < 0) { dev_err(dev, "Failed to get port status (err:0x%x)\n", ret); return -EINVAL; } break; default: break; } switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = port->psy_online; break; case POWER_SUPPLY_PROP_STATUS: val->intval = port->psy_status; break; case POWER_SUPPLY_PROP_CURRENT_MAX: val->intval = port->psy_current_max * 1000; break; case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: val->intval = port->psy_voltage_max_design * 1000; break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = port->psy_voltage_now * 1000; break; case POWER_SUPPLY_PROP_USB_TYPE: val->intval = port->psy_usb_type; break; case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: if (input_current_limit == EC_POWER_LIMIT_NONE) val->intval = -1; else val->intval = input_current_limit * 1000; break; case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: if (input_voltage_limit == EC_POWER_LIMIT_NONE) val->intval = -1; else val->intval = input_voltage_limit * 1000; break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = port->model_name; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = port->manufacturer; break; default: return -EINVAL; } return 0; } static int cros_usbpd_charger_set_prop(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct port_data *port = power_supply_get_drvdata(psy); struct charger_data *charger = port->charger; struct device *dev = charger->dev; u16 intval; int ret; /* U16_MAX in mV/mA is the maximum supported value */ if (val->intval >= U16_MAX * 1000) return -EINVAL; /* A negative number is used to clear the limit */ if (val->intval < 0) intval = EC_POWER_LIMIT_NONE; else /* Convert from uA/uV to mA/mV */ intval = val->intval / 1000; switch (psp) { case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: ret = cros_usbpd_charger_set_ext_power_limit(charger, intval, input_voltage_limit); if (ret < 0) break; input_current_limit = intval; if (input_current_limit == EC_POWER_LIMIT_NONE) dev_info(dev, "External Current Limit cleared for all ports\n"); else dev_info(dev, "External Current Limit set to %dmA for all ports\n", input_current_limit); break; case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: ret = cros_usbpd_charger_set_ext_power_limit(charger, input_current_limit, intval); if (ret < 0) break; input_voltage_limit = intval; if (input_voltage_limit == EC_POWER_LIMIT_NONE) dev_info(dev, "External Voltage Limit cleared for all ports\n"); else dev_info(dev, "External Voltage Limit set to %dmV for all ports\n", input_voltage_limit); break; default: ret = -EINVAL; } return ret; } static int cros_usbpd_charger_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { int ret; switch (psp) { case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: ret = 1; break; default: ret = 0; } return ret; } static int cros_usbpd_charger_ec_event(struct notifier_block *nb, unsigned long host_event, void *_notify) { struct charger_data *charger = container_of(nb, struct charger_data, notifier); cros_usbpd_charger_power_changed(charger->ports[0]->psy); return NOTIFY_OK; } static void cros_usbpd_charger_unregister_notifier(void *data) { struct charger_data *charger = data; cros_usbpd_unregister_notify(&charger->notifier); } static int cros_usbpd_charger_probe(struct platform_device *pd) { struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); struct cros_ec_device *ec_device = ec_dev->ec_dev; struct power_supply_desc *psy_desc; struct device *dev = &pd->dev; struct charger_data *charger; struct power_supply *psy; struct port_data *port; int ret = -EINVAL; int i; charger = devm_kzalloc(dev, sizeof(struct charger_data), GFP_KERNEL); if (!charger) return -ENOMEM; charger->dev = dev; charger->ec_dev = ec_dev; charger->ec_device = ec_device; platform_set_drvdata(pd, charger); /* * We need to know the number of USB PD ports in order to know whether * there is a dedicated port. The dedicated port will always be * after the USB PD ports, and there should be only one. */ charger->num_usbpd_ports = cros_usbpd_charger_get_usbpd_num_ports(charger); if (charger->num_usbpd_ports <= 0) { /* * This can happen on a system that doesn't support USB PD. * Log a message, but no need to warn. */ dev_info(dev, "No USB PD charging ports found\n"); } charger->num_charger_ports = cros_usbpd_charger_get_num_ports(charger); if (charger->num_charger_ports < 0) { /* * This can happen on a system that doesn't support USB PD. * Log a message, but no need to warn. * Older ECs do not support the above command, in that case * let's set up the number of charger ports equal to the number * of USB PD ports */ dev_info(dev, "Could not get charger port count\n"); charger->num_charger_ports = charger->num_usbpd_ports; } if (charger->num_charger_ports <= 0) { /* * This can happen on a system that doesn't support USB PD and * doesn't have a dedicated port. * Log a message, but no need to warn. */ dev_info(dev, "No charging ports found\n"); ret = -ENODEV; goto fail_nowarn; } /* * Sanity checks on the number of ports: * there should be at most 1 dedicated port */ if (charger->num_charger_ports < charger->num_usbpd_ports || charger->num_charger_ports > (charger->num_usbpd_ports + 1)) { dev_err(dev, "Unexpected number of charge port count\n"); ret = -EPROTO; goto fail_nowarn; } for (i = 0; i < charger->num_charger_ports; i++) { struct power_supply_config psy_cfg = {}; port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL); if (!port) { ret = -ENOMEM; goto fail; } port->charger = charger; port->port_number = i; psy_desc = &port->psy_desc; psy_desc->get_property = cros_usbpd_charger_get_prop; psy_desc->set_property = cros_usbpd_charger_set_prop; psy_desc->property_is_writeable = cros_usbpd_charger_property_is_writeable; psy_desc->external_power_changed = cros_usbpd_charger_power_changed; psy_cfg.drv_data = port; if (cros_usbpd_charger_port_is_dedicated(port)) { sprintf(port->name, CHARGER_DEDICATED_DIR_NAME); psy_desc->type = POWER_SUPPLY_TYPE_MAINS; psy_desc->properties = cros_usbpd_dedicated_charger_props; psy_desc->num_properties = ARRAY_SIZE(cros_usbpd_dedicated_charger_props); } else { sprintf(port->name, CHARGER_USBPD_DIR_NAME, i); psy_desc->type = POWER_SUPPLY_TYPE_USB; psy_desc->properties = cros_usbpd_charger_props; psy_desc->num_properties = ARRAY_SIZE(cros_usbpd_charger_props); psy_desc->usb_types = cros_usbpd_charger_usb_types; psy_desc->num_usb_types = ARRAY_SIZE(cros_usbpd_charger_usb_types); } psy_desc->name = port->name; psy = devm_power_supply_register_no_ws(dev, psy_desc, &psy_cfg); if (IS_ERR(psy)) { dev_err(dev, "Failed to register power supply\n"); continue; } port->psy = psy; charger->ports[charger->num_registered_psy++] = port; } if (!charger->num_registered_psy) { ret = -ENODEV; dev_err(dev, "No power supplies registered\n"); goto fail; } /* Get PD events from the EC */ charger->notifier.notifier_call = cros_usbpd_charger_ec_event; ret = cros_usbpd_register_notify(&charger->notifier); if (ret < 0) { dev_warn(dev, "failed to register notifier\n"); } else { ret = devm_add_action_or_reset(dev, cros_usbpd_charger_unregister_notifier, charger); if (ret < 0) goto fail; } return 0; fail: WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret); fail_nowarn: dev_info(dev, "Failing probe (err:0x%x)\n", ret); return ret; } #ifdef CONFIG_PM_SLEEP static int cros_usbpd_charger_resume(struct device *dev) { struct charger_data *charger = dev_get_drvdata(dev); int i; if (!charger) return 0; for (i = 0; i < charger->num_registered_psy; i++) { power_supply_changed(charger->ports[i]->psy); charger->ports[i]->last_update = jiffies - CHARGER_CACHE_UPDATE_DELAY; } return 0; } #endif static SIMPLE_DEV_PM_OPS(cros_usbpd_charger_pm_ops, NULL, cros_usbpd_charger_resume); static struct platform_driver cros_usbpd_charger_driver = { .driver = { .name = DRV_NAME, .pm = &cros_usbpd_charger_pm_ops, }, .probe = cros_usbpd_charger_probe }; module_platform_driver(cros_usbpd_charger_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("ChromeOS EC USBPD charger"); MODULE_ALIAS("platform:" DRV_NAME);