Hi, On Wed, May 02, 2018 at 05:44:17PM +0200, Enric Balletbo i Serra wrote: > From: Sameer Nanda > > This driver gets various bits of information about what is connected to > USB PD ports from the EC and converts that into power_supply properties. > > Signed-off-by: Sameer Nanda > Signed-off-by: Enric Balletbo i Serra > Acked-by: Lee Jones > --- Thanks, queued. -- Sebastian > > Changes in v4: > - [2/3] Drop cros_ec_device->charger as is not used. > > Changes in v3: > - [2/3] Add missing POWER_SUPPLY_PROP_USB_TYPE and a list of supported USB types. > - [2/3] Fix SPDX header -> GPL-2.0+ > - [2/3] Unregister blocking_notifier_chain on remove. > > Changes in v2: > - [2/3] Add SPDX header, use devm_ variant and drop .owner > - [2/3] Removed the PD log functionality (will be send on a follow up patch) > - [2/3] Removed the extra custom sysfs attributes (will be send on a follow up patch) > > drivers/power/supply/Kconfig | 10 + > drivers/power/supply/Makefile | 1 + > drivers/power/supply/cros_usbpd-charger.c | 544 ++++++++++++++++++++++ > 3 files changed, 555 insertions(+) > create mode 100644 drivers/power/supply/cros_usbpd-charger.c > > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig > index 428b426842f4..046eb23ba6f0 100644 > --- a/drivers/power/supply/Kconfig > +++ b/drivers/power/supply/Kconfig > @@ -624,4 +624,14 @@ config CHARGER_RT9455 > help > Say Y to enable support for Richtek RT9455 battery charger. > > +config CHARGER_CROS_USBPD > + tristate "ChromeOS EC based USBPD charger" > + depends on MFD_CROS_EC > + default n > + help > + Say Y here to enable ChromeOS EC based USBPD charger > + driver. This driver gets various bits of information about > + what is connected to USB PD ports from the EC and converts > + that into power_supply properties. > + > endif # POWER_SUPPLY > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile > index e83aa843bcc6..907e26f824b2 100644 > --- a/drivers/power/supply/Makefile > +++ b/drivers/power/supply/Makefile > @@ -83,3 +83,4 @@ obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o > obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o > obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o > obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o > +obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o > diff --git a/drivers/power/supply/cros_usbpd-charger.c b/drivers/power/supply/cros_usbpd-charger.c > new file mode 100644 > index 000000000000..3a0c96fd1bc1 > --- /dev/null > +++ b/drivers/power/supply/cros_usbpd-charger.c > @@ -0,0 +1,544 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Power supply driver for ChromeOS EC based USB PD Charger. > + * > + * Copyright (c) 2014 - 2018 Google, Inc > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define CHARGER_DIR_NAME "CROS_USBPD_CHARGER%d" > +#define CHARGER_DIR_NAME_LENGTH sizeof(CHARGER_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_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_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_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 > +}; > + > +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(sizeof(*msg) + 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_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) { > + dev_err(charger->dev, > + "Unable to get the number or ports (err:0x%x)\n", ret); > + 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_err(dev, "Port %d: default case!\n", port->port_number); > + port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP; > + } > + > + 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; > + > + ret = cros_usbpd_charger_get_discovery_info(port); > + port->last_update = jiffies; > + > + 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; > + 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_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_ec_event(struct notifier_block *nb, > + unsigned long queued_during_suspend, > + void *_notify) > +{ > + struct cros_ec_device *ec_device; > + struct charger_data *charger; > + struct device *dev; > + u32 host_event; > + > + charger = container_of(nb, struct charger_data, notifier); > + ec_device = charger->ec_device; > + dev = charger->dev; > + > + host_event = cros_ec_get_host_event(ec_device); > + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) { > + cros_usbpd_charger_power_changed(charger->ports[0]->psy); > + return NOTIFY_OK; > + } else { > + return NOTIFY_DONE; > + } > +} > + > +static void cros_usbpd_charger_unregister_notifier(void *data) > +{ > + struct charger_data *charger = data; > + struct cros_ec_device *ec_device = charger->ec_device; > + > + blocking_notifier_chain_unregister(&ec_device->event_notifier, > + &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); > + > + 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. > + */ > + dev_info(dev, "No charging ports found\n"); > + ret = -ENODEV; > + 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; > + sprintf(port->name, CHARGER_DIR_NAME, i); > + > + psy_desc = &port->psy_desc; > + psy_desc->name = port->name; > + psy_desc->type = POWER_SUPPLY_TYPE_USB; > + psy_desc->get_property = cros_usbpd_charger_get_prop; > + psy_desc->external_power_changed = > + cros_usbpd_charger_power_changed; > + 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_cfg.drv_data = port; > + > + 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; > + } > + > + if (ec_device->mkbp_event_supported) { > + /* Get PD events from the EC */ > + charger->notifier.notifier_call = cros_usbpd_charger_ec_event; > + ret = blocking_notifier_chain_register( > + &ec_device->event_notifier, > + &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); > -- > 2.17.0 > > > -- > To unsubscribe, send mail to kernel-unsubscribe@lists.collabora.co.uk.