[v2,6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

Message ID	1455281825-23526-7-git-send-email-tomeu.vizoso@collabora.com (mailing list archive)
State	Not Applicable, archived
Headers	show Return-Path: <linux-pm-owner@kernel.org> From: Tomeu Vizoso <tomeu.vizoso@collabora.com> To: linux-kernel@vger.kernel.org Cc: Sameer Nanda <snanda@chromium.org>, Lee Jones <lee.jones@linaro.org>, Benson Leung <bleung@chromium.org>, =?UTF-8?q?Enric=20Balletb=C3=B2?= <enric.balletbo@collabora.co.uk>, Vic Yang <victoryang@chromium.org>, Vincent Palatin <vpalatin@chromium.org>, Randall Spangler <rspangler@chromium.org>, Todd Broch <tbroch@chromium.org>, Gwendal Grignou <gwendal@chromium.org>, Tomeu Vizoso <tomeu.vizoso@collabora.com>, Shawn Nematbakhsh <shawnn@chromium.org>, Sebastian Reichel <sre@kernel.org>, Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>, linux-pm@vger.kernel.org, David Woodhouse <dwmw2@infradead.org> Subject: [PATCH v2 6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver Date: Fri, 12 Feb 2016 13:57:03 +0100 Message-Id: <1455281825-23526-7-git-send-email-tomeu.vizoso@collabora.com> In-Reply-To: <1455281825-23526-1-git-send-email-tomeu.vizoso@collabora.com> References: <1455281825-23526-1-git-send-email-tomeu.vizoso@collabora.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk

On 02/12/2016 04:57 AM, Tomeu Vizoso wrote: > > > diff --git a/drivers/power/cros_usbpd-charger.c b/drivers/power/cros_usbpd-charger.c > new file mode 100644 > index 000000000000..c1aa58b47f56 > --- /dev/null > +++ b/drivers/power/cros_usbpd-charger.c > @@ -0,0 +1,908 @@ > +/* > + * Power supply driver for ChromeOS EC based USB PD Charger. > + * > + * Copyright (c) 2014 Google, Inc > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <linux/fs.h> > +#include <linux/ktime.h> > +#include <linux/module.h> > +#include <linux/mfd/cros_ec.h> > +#include <linux/mfd/cros_ec_commands.h> > +#include <linux/platform_device.h> > +#include <linux/power_supply.h> > +#include <linux/rtc.h> > +#include <linux/slab.h> > + > +#define CROS_USB_PD_MAX_PORTS 8 > +#define CROS_USB_PD_MAX_LOG_ENTRIES 30 > + > +#define CROS_USB_PD_LOG_UPDATE_DELAY msecs_to_jiffies(60000) > +#define CROS_USB_PD_CACHE_UPDATE_DELAY msecs_to_jiffies(500) > + > +/* Buffer + macro for building PDLOG string */ > +#define BUF_SIZE 80 > +#define APPEND_STRING(buf, len, str, ...) ((len) += \ > + snprintf((buf) + (len), max(BUF_SIZE - (len), 0), (str), ##__VA_ARGS__)) > + > +#define CHARGER_DIR_NAME "CROS_USB_PD_CHARGER%d" > +#define CHARGER_DIR_NAME_LENGTH sizeof(CHARGER_DIR_NAME) > + > +#define MANUFACTURER_MODEL_LENGTH 32 > + > +struct port_data { > + int port_number; > + char name[CHARGER_DIR_NAME_LENGTH]; > + char manufacturer[MANUFACTURER_MODEL_LENGTH]; > + char model_name[MANUFACTURER_MODEL_LENGTH]; > + struct power_supply *psy; > + struct power_supply_desc psy_desc; > + int psy_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[CROS_USB_PD_MAX_PORTS]; > + struct delayed_work log_work; > + struct workqueue_struct *log_workqueue; > + struct notifier_block notifier; > + bool suspended; > +}; > + > +#define EC_MAX_IN_SIZE EC_PROTO2_MAX_REQUEST_SIZE > +#define EC_MAX_OUT_SIZE EC_PROTO2_MAX_RESPONSE_SIZE > +uint8_t ec_inbuf[EC_MAX_IN_SIZE]; > +uint8_t ec_outbuf[EC_MAX_OUT_SIZE]; static? Why can't these be part of charger_data? > > + > +static int set_ec_usb_pd_override_ports(struct charger_data *charger, > + int port_num) > +{ > + struct device *dev = charger->dev; > + struct ec_params_charge_port_override req; > + int ret; > + > + req.override_port = port_num; > + > + ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_CHARGE_PORT_OVERRIDE, > + (uint8_t *)&req, sizeof(req), > + NULL, 0); > + if (ret < 0) { > + dev_info(dev, "Port Override command returned 0x%x\n", ret); dev_err? > + return -EINVAL; > + } > + > + return 0; > +} > + > + [...] > + > +static void cros_usb_pd_print_log_entry(struct ec_response_pd_log *r, > + ktime_t tstamp) > +{ > + static const char * const fault_names[] = { > + "---", "OCP", "fast OCP", "OVP", "Discharge" > + }; > + static const char * const role_names[] = { > + "Disconnected", "SRC", "SNK", "SNK (not charging)" > + }; > + static const char * const chg_type_names[] = { > + "None", "PD", "Type-C", "Proprietary", > + "DCP", "CDP", "SDP", "Other", "VBUS" > + }; > + int i; > + int role_idx, type_idx; > + const char *fault, *role, *chg_type; > + struct usb_chg_measures *meas; > + struct mcdp_info *minfo; > + struct rtc_time rt; > + int len = 0; > + char buf[BUF_SIZE + 1]; > + > + /* the timestamp is the number of 1024th of seconds in the past */ > + tstamp = ktime_sub_us(tstamp, > + (uint64_t)r->timestamp << PD_LOG_TIMESTAMP_SHIFT); > + rt = rtc_ktime_to_tm(tstamp); > + > + switch (r->type) { > + case PD_EVENT_MCU_CHARGE: > + if (r->data & CHARGE_FLAGS_OVERRIDE) > + APPEND_STRING(buf, len, "override "); > + if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE) > + APPEND_STRING(buf, len, "pending_override "); > + role_idx = r->data & CHARGE_FLAGS_ROLE_MASK; > + role = role_idx < ARRAY_SIZE(role_names) ? > + role_names[role_idx] : "Unknown"; > + type_idx = (r->data & CHARGE_FLAGS_TYPE_MASK) > + >> CHARGE_FLAGS_TYPE_SHIFT; > + chg_type = type_idx < ARRAY_SIZE(chg_type_names) ? > + chg_type_names[type_idx] : "???"; > + > + if ((role_idx == USB_PD_PORT_POWER_DISCONNECTED) || > + (role_idx == USB_PD_PORT_POWER_SOURCE)) { > + APPEND_STRING(buf, len, "%s", role); > + break; > + } > + > + meas = (struct usb_chg_measures *)r->payload; > + APPEND_STRING(buf, len, "%s %s %s %dmV max %dmV / %dmA", role, > + r->data & CHARGE_FLAGS_DUAL_ROLE ? "DRP" : "Charger", > + chg_type, > + meas->voltage_now, > + meas->voltage_max, > + meas->current_max); > + break; > + case PD_EVENT_ACC_RW_FAIL: > + APPEND_STRING(buf, len, "RW signature check failed"); > + break; > + case PD_EVENT_PS_FAULT: > + fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data] > + : "???"; > + APPEND_STRING(buf, len, "Power supply fault: %s", fault); > + break; > + case PD_EVENT_VIDEO_DP_MODE: > + APPEND_STRING(buf, len, "DP mode %sabled", > + (r->data == 1) ? "en" : "dis"); > + break; > + case PD_EVENT_VIDEO_CODEC: > + minfo = (struct mcdp_info *)r->payload; > + APPEND_STRING(buf, len, > + "HDMI info: family:%04x chipid:%04x irom:%d.%d.%d fw:%d.%d.%d", > + MCDP_FAMILY(minfo->family), > + MCDP_CHIPID(minfo->chipid), > + minfo->irom.major, minfo->irom.minor, > + minfo->irom.build, minfo->fw.major, > + minfo->fw.minor, minfo->fw.build); > + break; > + default: > + APPEND_STRING(buf, len, > + "Event %02x (%04x) [", r->type, r->data); > + for (i = 0; i < PD_LOG_SIZE(r->size_port); i++) > + APPEND_STRING(buf, len, "%02x ", r->payload[i]); > + APPEND_STRING(buf, len, "]"); > + break; > + } > + > + pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n", > + rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday, > + rt.tm_hour, rt.tm_min, rt.tm_sec, > + (int)(ktime_to_ms(tstamp) % MSEC_PER_SEC), > + PD_LOG_PORT(r->size_port), buf); Is the kernel log a good place to be putting this information? Maybe this should go into debugfs? > +} > + > +static void cros_usb_pd_log_check(struct work_struct *work) > +{ > + struct charger_data *charger = container_of(to_delayed_work(work), > + struct charger_data, log_work); > + struct device *dev = charger->dev; > + union { > + struct ec_response_pd_log r; > + uint32_t words[8]; /* space for the payload */ > + } u; > + int ret; > + int entries = 0; > + ktime_t now; > + > + if (charger->suspended) { > + dev_dbg(dev, "Suspended...bailing out\n"); > + return; > + } > + > + while (entries++ < CROS_USB_PD_MAX_LOG_ENTRIES) { > + ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_GET_LOG_ENTRY, > + NULL, 0, (uint8_t *)&u, sizeof(u)); > + now = ktime_get_real(); > + if (ret < 0) { > + dev_dbg(dev, "Cannot get PD log %d\n", ret); > + break; > + } > + if (u.r.type == PD_EVENT_NO_ENTRY) > + break; > + > + cros_usb_pd_print_log_entry(&u.r, now); > + } > + > + queue_delayed_work(charger->log_workqueue, &charger->log_work, > + CROS_USB_PD_LOG_UPDATE_DELAY); > +} > + > +static int cros_usb_pd_ec_event(struct notifier_block *nb, > + unsigned long queued_during_suspend, void *_notify) > +{ > + struct charger_data *charger; > + struct device *dev; > + struct cros_ec_device *ec_device; > + u32 host_event; > + > + charger = container_of(nb, struct charger_data, notifier); > + dev = charger->dev; > + ec_device = charger->ec_device; > + > + host_event = cros_ec_get_host_event(ec_device); > + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) { > + cros_usb_pd_charger_power_changed(charger->ports[0]->psy); > + return NOTIFY_OK; > + } else { > + return NOTIFY_DONE; > + } Simplify to return NOTIFY_DONE without the else. > +} > + > +static char *charger_supplied_to[] = {"cros-usb_pd-charger"}; const? > + > +static int cros_usb_pd_charger_probe(struct platform_device *pd) > +{ > + struct device *dev = &pd->dev; > + struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); > + struct cros_ec_device *ec_device; > + struct charger_data *charger; > + struct port_data *port; > + struct power_supply_desc *psy_desc; > + struct power_supply_config psy_cfg = {}; > + int i; > + int ret = -EINVAL; > + > + dev_dbg(dev, "cros_usb_pd_charger_probe\n"); > + if (!ec_dev) { > + WARN(1, "%s: No EC dev found\n", dev_name(dev)); > + return -EINVAL; > + } > + > + ec_device = ec_dev->ec_dev; > + if (!ec_device) { > + WARN(1, "%s: No EC device found\n", dev_name(dev)); > + return -EINVAL; > + } > + > + 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); > + > + if ((get_ec_num_ports(charger, &charger->num_charger_ports) < 0) || > + !charger->num_charger_ports) { > + /* > + * 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"); dev_err? > + ret = -ENODEV; > + goto fail_nowarn; > + } > + > + for (i = 0; i < charger->num_charger_ports; i++) { > + port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL); > + if (!port) { > + dev_err(dev, "Failed to alloc port structure\n"); We don't need error messages on allocation failures (checkpatch usually catches this). > + 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_usb_pd_charger_get_prop; > + psy_desc->set_property = cros_usb_pd_charger_set_prop; > + psy_desc->property_is_writeable = > + cros_usb_pd_charger_is_writeable; > + psy_desc->external_power_changed = > + cros_usb_pd_charger_power_changed; > + psy_desc->properties = cros_usb_pd_charger_props; > + psy_desc->num_properties = ARRAY_SIZE( > + cros_usb_pd_charger_props); > + > + psy_cfg.drv_data = port; > + psy_cfg.supplied_to = charger_supplied_to; > + psy_cfg.num_supplicants = ARRAY_SIZE(charger_supplied_to); > + > + port->psy = power_supply_register_no_ws(dev, psy_desc, > + &psy_cfg); > + if (IS_ERR(port->psy)) { > + dev_err(dev, "Failed to register power supply: %ld\n", > + PTR_ERR(port->psy)); > + continue; > + } > + > + 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_usb_pd_ec_event; > + ret = blocking_notifier_chain_register( > + &ec_device->event_notifier, &charger->notifier); > + if (ret < 0) > + dev_warn(dev, "failed to register notifier\n"); > + } > + > + /* Retrieve PD event logs periodically */ > + INIT_DELAYED_WORK(&charger->log_work, cros_usb_pd_log_check); > + charger->log_workqueue = > + create_singlethread_workqueue("cros_usb_pd_log"); > + queue_delayed_work(charger->log_workqueue, &charger->log_work, > + CROS_USB_PD_LOG_UPDATE_DELAY); > + > + return 0; > + > +fail: > + WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret); > + > +fail_nowarn: > + if (charger) { This is always true? > + for (i = 0; i < charger->num_registered_psy; i++) { > + port = charger->ports[i]; > + power_supply_unregister(port->psy); > + devm_kfree(dev, port); > + } > + platform_set_drvdata(pd, NULL); > + devm_kfree(dev, charger); Seems like we could let devres take care of this. > + } > + > + dev_info(dev, "Failing probe (err:0x%x)\n", ret); Is this necessary? Doesn't driver core already spew something out for this case if some debugging flag is enabled? > + return ret; > +} > + > +static int cros_usb_pd_charger_remove(struct platform_device *pd) > +{ > + struct charger_data *charger = platform_get_drvdata(pd); > + struct device *dev = charger->dev; > + struct port_data *port; > + int i; > + > + if (charger) { We just derefed charger a few lines up. > + for (i = 0; i < charger->num_registered_psy; i++) { > + port = charger->ports[i]; > + power_supply_unregister(port->psy); > + devm_kfree(dev, port); Can't we let driver removal take care of this? > + } > + flush_delayed_work(&charger->log_work); > + platform_set_drvdata(pd, NULL); This is not needed. > + devm_kfree(dev, charger); Again, driver remove already does this? > + } > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int cros_usb_pd_charger_resume(struct device *dev) > +{ > + struct charger_data *charger = dev_get_drvdata(dev); > + int i; > + > + if (!charger) > + return 0; Seems sort of impossible... > + > + charger->suspended = false; > + > + dev_dbg(dev, "cros_usb_pd_charger_resume: updating power supplies\n"); > + for (i = 0; i < charger->num_registered_psy; i++) { > + power_supply_changed(charger->ports[i]->psy); > + charger->ports[i]->last_update = > + jiffies - CROS_USB_PD_CACHE_UPDATE_DELAY; > + } > + queue_delayed_work(charger->log_workqueue, &charger->log_work, > + CROS_USB_PD_LOG_UPDATE_DELAY); > + > + return 0; > +} > + > +static int cros_usb_pd_charger_suspend(struct device *dev) > +{ > + struct charger_data *charger = dev_get_drvdata(dev); > + > + charger->suspended = true; > + > + if (charger) We just derefed charger so it better be non-NULL > + flush_delayed_work(&charger->log_work); > + return 0; > +} > +#endif > + > +static int set_ec_ext_power_limit(struct cros_ec_dev *ec, > + uint16_t current_lim, uint16_t voltage_lim) > +{ > + struct ec_params_external_power_limit_v1 req; > + int ret; > + > + req.current_lim = current_lim; > + req.voltage_lim = voltage_lim; > + > + ret = ec_command(ec, 0, EC_CMD_EXT_POWER_CURRENT_LIMIT, > + (uint8_t *)&req, sizeof(req), NULL, 0); > + if (ret < 0) { > + dev_warn(ec->dev, > + "External power limit command returned 0x%x\n", > + ret); dev_err? > + return -EINVAL; > + } > + > + return 0; > +} > + > +static ssize_t get_ec_ext_current_lim(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + return scnprintf(buf, PAGE_SIZE, "%d\n", ext_current_lim); > +} > + > +static ssize_t set_ec_ext_current_lim(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + int ret; > + uint16_t tmp_val; > + struct cros_ec_dev *ec = container_of( > + dev, struct cros_ec_dev, class_dev); > + > + if (kstrtou16(buf, 0, &tmp_val) < 0) > + return -EINVAL; > + > + ret = set_ec_ext_power_limit(ec, tmp_val, ext_voltage_lim); > + if (ret < 0) > + return ret; > + > + ext_current_lim = tmp_val; > + if (ext_current_lim == EC_POWER_LIMIT_NONE) > + dev_info(ec->dev, "External current limit removed\n"); > + else > + dev_info(ec->dev, "External current limit set to %dmA\n", > + ext_current_lim); Why are we dev_info printing on sysfs writes? > + > + return count; > +} > + > +static ssize_t get_ec_ext_voltage_lim(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + return scnprintf(buf, PAGE_SIZE, "%d\n", ext_voltage_lim); > +} > + > +static ssize_t set_ec_ext_voltage_lim(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + int ret; > + uint16_t tmp_val; > + > + struct cros_ec_dev *ec = container_of( > + dev, struct cros_ec_dev, class_dev); > + > + if (kstrtou16(buf, 0, &tmp_val) < 0) > + return -EINVAL; > + > + ret = set_ec_ext_power_limit(ec, ext_current_lim, tmp_val); > + if (ret < 0) > + return ret; > + > + ext_voltage_lim = tmp_val; > + if (ext_voltage_lim == EC_POWER_LIMIT_NONE) > + dev_info(ec->dev, "External voltage limit removed\n"); > + else > + dev_info(ec->dev, "External voltage limit set to %dmV\n", > + ext_voltage_lim); Again... > + > + return count; > +} > + > +static DEVICE_ATTR(ext_current_lim, S_IWUSR | S_IWGRP | S_IRUGO, > + get_ec_ext_current_lim, > + set_ec_ext_current_lim); > +static DEVICE_ATTR(ext_voltage_lim, S_IWUSR | S_IWGRP | S_IRUGO, > + get_ec_ext_voltage_lim, > + set_ec_ext_voltage_lim); Any documentation for these in Documentation/ABI? > + > +static struct attribute *__ext_power_cmds_attrs[] = { > + &dev_attr_ext_current_lim.attr, > + &dev_attr_ext_voltage_lim.attr, > + NULL, > +}; > + > +struct attribute_group cros_usb_pd_charger_attr_group = { static? > + .name = "usb-pd-charger", > + .attrs = __ext_power_cmds_attrs, > +}; > + > +static SIMPLE_DEV_PM_OPS(cros_usb_pd_charger_pm_ops, > + cros_usb_pd_charger_suspend, cros_usb_pd_charger_resume); const? > + > +static struct platform_driver cros_usb_pd_charger_driver = { > + .driver = { > + .name = "cros-usb-pd-charger", > + .owner = THIS_MODULE, This isn't needed anymore. > + .pm = &cros_usb_pd_charger_pm_ops, > + }, > + .probe = cros_usb_pd_charger_probe, > + .remove = cros_usb_pd_charger_remove, > +}; > + > +module_platform_driver(cros_usb_pd_charger_driver); >

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 1ddd13cc0c07..26355850d91b 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -502,6 +502,16 @@ config AXP20X_POWER This driver provides support for the power supply features of AXP20x PMIC. +config CHARGER_CROS_USB_PD + tristate "Chrome OS EC based USB PD charger" + depends on MFD_CROS_EC + default y + help + Say Y here to enable Chrome OS EC based USB PD 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 source "drivers/power/reset/Kconfig" diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 0e4eab55f8d7..b83685bfae61 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -73,3 +73,4 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o obj-$(CONFIG_POWER_RESET) += reset/ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o +obj-$(CONFIG_CHARGER_CROS_USB_PD) += cros_usbpd-charger.o diff --git a/drivers/power/cros_usbpd-charger.c b/drivers/power/cros_usbpd-charger.c new file mode 100644 index 000000000000..c1aa58b47f56 --- /dev/null +++ b/drivers/power/cros_usbpd-charger.c @@ -0,0 +1,908 @@ +/* + * Power supply driver for ChromeOS EC based USB PD Charger. + * + * Copyright (c) 2014 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/fs.h> +#include <linux/ktime.h> +#include <linux/module.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/rtc.h> +#include <linux/slab.h> + +#define CROS_USB_PD_MAX_PORTS 8 +#define CROS_USB_PD_MAX_LOG_ENTRIES 30 + +#define CROS_USB_PD_LOG_UPDATE_DELAY msecs_to_jiffies(60000) +#define CROS_USB_PD_CACHE_UPDATE_DELAY msecs_to_jiffies(500) + +/* Buffer + macro for building PDLOG string */ +#define BUF_SIZE 80 +#define APPEND_STRING(buf, len, str, ...) ((len) += \ + snprintf((buf) + (len), max(BUF_SIZE - (len), 0), (str), ##__VA_ARGS__)) + +#define CHARGER_DIR_NAME "CROS_USB_PD_CHARGER%d" +#define CHARGER_DIR_NAME_LENGTH sizeof(CHARGER_DIR_NAME) + +#define MANUFACTURER_MODEL_LENGTH 32 + +struct port_data { + int port_number; + char name[CHARGER_DIR_NAME_LENGTH]; + char manufacturer[MANUFACTURER_MODEL_LENGTH]; + char model_name[MANUFACTURER_MODEL_LENGTH]; + struct power_supply *psy; + struct power_supply_desc psy_desc; + int psy_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[CROS_USB_PD_MAX_PORTS]; + struct delayed_work log_work; + struct workqueue_struct *log_workqueue; + struct notifier_block notifier; + bool suspended; +}; + +#define EC_MAX_IN_SIZE EC_PROTO2_MAX_REQUEST_SIZE +#define EC_MAX_OUT_SIZE EC_PROTO2_MAX_RESPONSE_SIZE +uint8_t ec_inbuf[EC_MAX_IN_SIZE]; +uint8_t ec_outbuf[EC_MAX_OUT_SIZE]; + +static enum power_supply_property cros_usb_pd_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_CHARGE_CONTROL_LIMIT_MAX, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +/* Current external voltage/current limit in mV/mA. Default to none. */ +static uint16_t ext_voltage_lim = EC_POWER_LIMIT_NONE; +static uint16_t ext_current_lim = EC_POWER_LIMIT_NONE; + +static int ec_command(struct cros_ec_dev *ec_dev, int version, int command, + uint8_t *outdata, int outsize, uint8_t *indata, + int insize) +{ + struct cros_ec_device *ec_device = ec_dev->ec_dev; + struct cros_ec_command *msg; + int ret; + + msg = kmalloc(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; + + memcpy(msg->data, outdata, outsize); + ret = cros_ec_cmd_xfer_status(ec_device, msg); + memcpy(indata, msg->data, insize); + + kfree(msg); + + return ret; +} + +static int set_ec_usb_pd_override_ports(struct charger_data *charger, + int port_num) +{ + struct device *dev = charger->dev; + struct ec_params_charge_port_override req; + int ret; + + req.override_port = port_num; + + ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_CHARGE_PORT_OVERRIDE, + (uint8_t *)&req, sizeof(req), + NULL, 0); + if (ret < 0) { + dev_info(dev, "Port Override command returned 0x%x\n", ret); + return -EINVAL; + } + + return 0; +} + +static int get_ec_num_ports(struct charger_data *charger, int *num_ports) +{ + struct device *dev = charger->dev; + struct ec_response_usb_pd_ports *resp = + (struct ec_response_usb_pd_ports *)ec_inbuf; + int ret; + + *num_ports = 0; + ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_PORTS, + NULL, 0, ec_inbuf, EC_MAX_IN_SIZE); + if (ret < 0) { + dev_err(dev, "Unable to query PD ports (err:0x%x)\n", ret); + return ret; + } + *num_ports = resp->num_ports; + dev_dbg(dev, "Num ports = %d\n", *num_ports); + + return 0; +} + +static int get_ec_usb_pd_discovery_info(struct port_data *port) +{ + struct charger_data *charger = port->charger; + struct device *dev = charger->dev; + struct ec_params_usb_pd_info_request req; + struct ec_params_usb_pd_discovery_entry resp; + int ret; + + req.port = port->port_number; + + ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_DISCOVERY, + (uint8_t *)&req, sizeof(req), + (uint8_t *)&resp, sizeof(resp)); + if (ret < 0) { + dev_err(dev, "Unable to query Discovery info (err:0x%x)\n", + ret); + return -EINVAL; + } + + dev_dbg(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, MANUFACTURER_MODEL_LENGTH, "%x", resp.vid); + snprintf(port->model_name, MANUFACTURER_MODEL_LENGTH, "%x", resp.pid); + + return 0; +} + +static int get_ec_usb_pd_power_info(struct port_data *port) +{ + struct charger_data *charger = port->charger; + struct device *dev = charger->dev; + struct ec_params_usb_pd_power_info req; + struct ec_response_usb_pd_power_info resp; + char role_str[80]; + int ret, last_psy_status, last_psy_type; + + req.port = port->port_number; + ret = ec_command(charger->ec_dev, 0, EC_CMD_USB_PD_POWER_INFO, + (uint8_t *)&req, sizeof(req), + (uint8_t *)&resp, sizeof(resp)); + if (ret < 0) { + dev_err(dev, "Unable to query PD power info (err:0x%x)\n", ret); + return -EINVAL; + } + + last_psy_status = port->psy_status; + last_psy_type = port->psy_type; + + switch (resp.role) { + case USB_PD_PORT_POWER_DISCONNECTED: + snprintf(role_str, sizeof(role_str), "%s", "DISCONNECTED"); + port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + port->psy_online = 0; + break; + case USB_PD_PORT_POWER_SOURCE: + snprintf(role_str, sizeof(role_str), "%s", "SOURCE"); + port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + port->psy_online = 0; + break; + case USB_PD_PORT_POWER_SINK: + snprintf(role_str, sizeof(role_str), "%s", "SINK"); + port->psy_status = POWER_SUPPLY_STATUS_CHARGING; + port->psy_online = 1; + break; + case USB_PD_PORT_POWER_SINK_NOT_CHARGING: + snprintf(role_str, sizeof(role_str), "%s", "NOT CHARGING"); + port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + port->psy_online = 1; + break; + default: + snprintf(role_str, sizeof(role_str), "%s", "UNKNOWN"); + 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_type = POWER_SUPPLY_TYPE_USB; + 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_type = POWER_SUPPLY_TYPE_USB_PD_DRP; + else + port->psy_type = POWER_SUPPLY_TYPE_USB; + break; + case USB_CHG_TYPE_PROPRIETARY: + port->psy_type = POWER_SUPPLY_TYPE_MAINS; + break; + case USB_CHG_TYPE_C: + port->psy_type = POWER_SUPPLY_TYPE_USB_TYPE_C; + break; + case USB_CHG_TYPE_BC12_DCP: + port->psy_type = POWER_SUPPLY_TYPE_USB_DCP; + break; + case USB_CHG_TYPE_BC12_CDP: + port->psy_type = POWER_SUPPLY_TYPE_USB_CDP; + break; + case USB_CHG_TYPE_PD: + if (resp.dualrole) + port->psy_type = POWER_SUPPLY_TYPE_USB_PD_DRP; + else + port->psy_type = POWER_SUPPLY_TYPE_USB_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. Treat this case as a dedicated charger since we + * don't know any better just yet. Additionally since the power + * capabilities are unknown, report the max current and voltage + * as zero. + */ + port->psy_type = POWER_SUPPLY_TYPE_MAINS; + 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_type = POWER_SUPPLY_TYPE_USB; + } + + port->psy_desc.type = port->psy_type; + + dev_dbg(dev, + "Port %d: %s type=%d=vmax=%d vnow=%d cmax=%d clim=%d pmax=%d\n", + port->port_number, role_str, 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_type != port->psy_type || + last_psy_status != port->psy_status) { + dev_dbg(dev, "Port %d: Calling power_supply_changed\n", + port->port_number); + power_supply_changed(port->psy); + } + + return 0; +} + +static int get_ec_port_status(struct port_data *port, bool ratelimit) +{ + int ret; + + if (ratelimit && + time_is_after_jiffies(port->last_update + + CROS_USB_PD_CACHE_UPDATE_DELAY)) + return 0; + + ret = get_ec_usb_pd_power_info(port); + if (ret < 0) + return ret; + + ret = get_ec_usb_pd_discovery_info(port); + port->last_update = jiffies; + + return ret; +} + +static void cros_usb_pd_charger_power_changed(struct power_supply *psy) +{ + struct port_data *port = power_supply_get_drvdata(psy); + struct charger_data *charger = port->charger; + struct device *dev = charger->dev; + int i; + + dev_dbg(dev, "cros_usb_pd_charger_power_changed\n"); + for (i = 0; i < charger->num_registered_psy; i++) + get_ec_port_status(charger->ports[i], false); +} + +static int cros_usb_pd_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 device *dev = charger->dev; + int ret; + + + /* Only refresh ec_port_status for dynamic properties */ + switch (psp) { + case POWER_SUPPLY_PROP_CURRENT_MAX: + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX: + ret = get_ec_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_CHARGE_CONTROL_LIMIT_MAX: + /* TODO: send a TBD host command to the EC. */ + val->intval = 0; + 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_usb_pd_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; + int port_number; + + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX: + /* + * A value of -1 implies switching to battery as the power + * source. Any other value implies using this port as the + * power source. + */ + port_number = val->intval; + if (port_number != -1) + port_number = port->port_number; + return set_ec_usb_pd_override_ports(charger, port_number); + default: + return -EINVAL; + } + return 0; +} + +static int cros_usb_pd_charger_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + int ret; + + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX: + ret = 1; + break; + default: + ret = 0; + } + + return ret; +} + +static void cros_usb_pd_print_log_entry(struct ec_response_pd_log *r, + ktime_t tstamp) +{ + static const char * const fault_names[] = { + "---", "OCP", "fast OCP", "OVP", "Discharge" + }; + static const char * const role_names[] = { + "Disconnected", "SRC", "SNK", "SNK (not charging)" + }; + static const char * const chg_type_names[] = { + "None", "PD", "Type-C", "Proprietary", + "DCP", "CDP", "SDP", "Other", "VBUS" + }; + int i; + int role_idx, type_idx; + const char *fault, *role, *chg_type; + struct usb_chg_measures *meas; + struct mcdp_info *minfo; + struct rtc_time rt; + int len = 0; + char buf[BUF_SIZE + 1]; + + /* the timestamp is the number of 1024th of seconds in the past */ + tstamp = ktime_sub_us(tstamp, + (uint64_t)r->timestamp << PD_LOG_TIMESTAMP_SHIFT); + rt = rtc_ktime_to_tm(tstamp); + + switch (r->type) { + case PD_EVENT_MCU_CHARGE: + if (r->data & CHARGE_FLAGS_OVERRIDE) + APPEND_STRING(buf, len, "override "); + if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE) + APPEND_STRING(buf, len, "pending_override "); + role_idx = r->data & CHARGE_FLAGS_ROLE_MASK; + role = role_idx < ARRAY_SIZE(role_names) ? + role_names[role_idx] : "Unknown"; + type_idx = (r->data & CHARGE_FLAGS_TYPE_MASK) + >> CHARGE_FLAGS_TYPE_SHIFT; + chg_type = type_idx < ARRAY_SIZE(chg_type_names) ? + chg_type_names[type_idx] : "???"; + + if ((role_idx == USB_PD_PORT_POWER_DISCONNECTED) || + (role_idx == USB_PD_PORT_POWER_SOURCE)) { + APPEND_STRING(buf, len, "%s", role); + break; + } + + meas = (struct usb_chg_measures *)r->payload; + APPEND_STRING(buf, len, "%s %s %s %dmV max %dmV / %dmA", role, + r->data & CHARGE_FLAGS_DUAL_ROLE ? "DRP" : "Charger", + chg_type, + meas->voltage_now, + meas->voltage_max, + meas->current_max); + break; + case PD_EVENT_ACC_RW_FAIL: + APPEND_STRING(buf, len, "RW signature check failed"); + break; + case PD_EVENT_PS_FAULT: + fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data] + : "???"; + APPEND_STRING(buf, len, "Power supply fault: %s", fault); + break; + case PD_EVENT_VIDEO_DP_MODE: + APPEND_STRING(buf, len, "DP mode %sabled", + (r->data == 1) ? "en" : "dis"); + break; + case PD_EVENT_VIDEO_CODEC: + minfo = (struct mcdp_info *)r->payload; + APPEND_STRING(buf, len, + "HDMI info: family:%04x chipid:%04x irom:%d.%d.%d fw:%d.%d.%d", + MCDP_FAMILY(minfo->family), + MCDP_CHIPID(minfo->chipid), + minfo->irom.major, minfo->irom.minor, + minfo->irom.build, minfo->fw.major, + minfo->fw.minor, minfo->fw.build); + break; + default: + APPEND_STRING(buf, len, + "Event %02x (%04x) [", r->type, r->data); + for (i = 0; i < PD_LOG_SIZE(r->size_port); i++) + APPEND_STRING(buf, len, "%02x ", r->payload[i]); + APPEND_STRING(buf, len, "]"); + break; + } + + pr_info("PDLOG %d/%02d/%02d %02d:%02d:%02d.%03d P%d %s\n", + rt.tm_year + 1900, rt.tm_mon + 1, rt.tm_mday, + rt.tm_hour, rt.tm_min, rt.tm_sec, + (int)(ktime_to_ms(tstamp) % MSEC_PER_SEC), + PD_LOG_PORT(r->size_port), buf); +} + +static void cros_usb_pd_log_check(struct work_struct *work) +{ + struct charger_data *charger = container_of(to_delayed_work(work), + struct charger_data, log_work); + struct device *dev = charger->dev; + union { + struct ec_response_pd_log r; + uint32_t words[8]; /* space for the payload */ + } u; + int ret; + int entries = 0; + ktime_t now; + + if (charger->suspended) { + dev_dbg(dev, "Suspended...bailing out\n"); + return; + } + + while (entries++ < CROS_USB_PD_MAX_LOG_ENTRIES) { + ret = ec_command(charger->ec_dev, 0, EC_CMD_PD_GET_LOG_ENTRY, + NULL, 0, (uint8_t *)&u, sizeof(u)); + now = ktime_get_real(); + if (ret < 0) { + dev_dbg(dev, "Cannot get PD log %d\n", ret); + break; + } + if (u.r.type == PD_EVENT_NO_ENTRY) + break; + + cros_usb_pd_print_log_entry(&u.r, now); + } + + queue_delayed_work(charger->log_workqueue, &charger->log_work, + CROS_USB_PD_LOG_UPDATE_DELAY); +} + +static int cros_usb_pd_ec_event(struct notifier_block *nb, + unsigned long queued_during_suspend, void *_notify) +{ + struct charger_data *charger; + struct device *dev; + struct cros_ec_device *ec_device; + u32 host_event; + + charger = container_of(nb, struct charger_data, notifier); + dev = charger->dev; + ec_device = charger->ec_device; + + host_event = cros_ec_get_host_event(ec_device); + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) { + cros_usb_pd_charger_power_changed(charger->ports[0]->psy); + return NOTIFY_OK; + } else { + return NOTIFY_DONE; + } +} + +static char *charger_supplied_to[] = {"cros-usb_pd-charger"}; + +static int cros_usb_pd_charger_probe(struct platform_device *pd) +{ + struct device *dev = &pd->dev; + struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); + struct cros_ec_device *ec_device; + struct charger_data *charger; + struct port_data *port; + struct power_supply_desc *psy_desc; + struct power_supply_config psy_cfg = {}; + int i; + int ret = -EINVAL; + + dev_dbg(dev, "cros_usb_pd_charger_probe\n"); + if (!ec_dev) { + WARN(1, "%s: No EC dev found\n", dev_name(dev)); + return -EINVAL; + } + + ec_device = ec_dev->ec_dev; + if (!ec_device) { + WARN(1, "%s: No EC device found\n", dev_name(dev)); + return -EINVAL; + } + + 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); + + if ((get_ec_num_ports(charger, &charger->num_charger_ports) < 0) || + !charger->num_charger_ports) { + /* + * 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++) { + port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL); + if (!port) { + dev_err(dev, "Failed to alloc port structure\n"); + 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_usb_pd_charger_get_prop; + psy_desc->set_property = cros_usb_pd_charger_set_prop; + psy_desc->property_is_writeable = + cros_usb_pd_charger_is_writeable; + psy_desc->external_power_changed = + cros_usb_pd_charger_power_changed; + psy_desc->properties = cros_usb_pd_charger_props; + psy_desc->num_properties = ARRAY_SIZE( + cros_usb_pd_charger_props); + + psy_cfg.drv_data = port; + psy_cfg.supplied_to = charger_supplied_to; + psy_cfg.num_supplicants = ARRAY_SIZE(charger_supplied_to); + + port->psy = power_supply_register_no_ws(dev, psy_desc, + &psy_cfg); + if (IS_ERR(port->psy)) { + dev_err(dev, "Failed to register power supply: %ld\n", + PTR_ERR(port->psy)); + continue; + } + + 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_usb_pd_ec_event; + ret = blocking_notifier_chain_register( + &ec_device->event_notifier, &charger->notifier); + if (ret < 0) + dev_warn(dev, "failed to register notifier\n"); + } + + /* Retrieve PD event logs periodically */ + INIT_DELAYED_WORK(&charger->log_work, cros_usb_pd_log_check); + charger->log_workqueue = + create_singlethread_workqueue("cros_usb_pd_log"); + queue_delayed_work(charger->log_workqueue, &charger->log_work, + CROS_USB_PD_LOG_UPDATE_DELAY); + + return 0; + +fail: + WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret); + +fail_nowarn: + if (charger) { + for (i = 0; i < charger->num_registered_psy; i++) { + port = charger->ports[i]; + power_supply_unregister(port->psy); + devm_kfree(dev, port); + } + platform_set_drvdata(pd, NULL); + devm_kfree(dev, charger); + } + + dev_info(dev, "Failing probe (err:0x%x)\n", ret); + return ret; +} + +static int cros_usb_pd_charger_remove(struct platform_device *pd) +{ + struct charger_data *charger = platform_get_drvdata(pd); + struct device *dev = charger->dev; + struct port_data *port; + int i; + + if (charger) { + for (i = 0; i < charger->num_registered_psy; i++) { + port = charger->ports[i]; + power_supply_unregister(port->psy); + devm_kfree(dev, port); + } + flush_delayed_work(&charger->log_work); + platform_set_drvdata(pd, NULL); + devm_kfree(dev, charger); + } + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int cros_usb_pd_charger_resume(struct device *dev) +{ + struct charger_data *charger = dev_get_drvdata(dev); + int i; + + if (!charger) + return 0; + + charger->suspended = false; + + dev_dbg(dev, "cros_usb_pd_charger_resume: updating power supplies\n"); + for (i = 0; i < charger->num_registered_psy; i++) { + power_supply_changed(charger->ports[i]->psy); + charger->ports[i]->last_update = + jiffies - CROS_USB_PD_CACHE_UPDATE_DELAY; + } + queue_delayed_work(charger->log_workqueue, &charger->log_work, + CROS_USB_PD_LOG_UPDATE_DELAY); + + return 0; +} + +static int cros_usb_pd_charger_suspend(struct device *dev) +{ + struct charger_data *charger = dev_get_drvdata(dev); + + charger->suspended = true; + + if (charger) + flush_delayed_work(&charger->log_work); + return 0; +} +#endif + +static int set_ec_ext_power_limit(struct cros_ec_dev *ec, + uint16_t current_lim, uint16_t voltage_lim) +{ + struct ec_params_external_power_limit_v1 req; + int ret; + + req.current_lim = current_lim; + req.voltage_lim = voltage_lim; + + ret = ec_command(ec, 0, EC_CMD_EXT_POWER_CURRENT_LIMIT, + (uint8_t *)&req, sizeof(req), NULL, 0); + if (ret < 0) { + dev_warn(ec->dev, + "External power limit command returned 0x%x\n", + ret); + return -EINVAL; + } + + return 0; +} + +static ssize_t get_ec_ext_current_lim(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", ext_current_lim); +} + +static ssize_t set_ec_ext_current_lim(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + uint16_t tmp_val; + struct cros_ec_dev *ec = container_of( + dev, struct cros_ec_dev, class_dev); + + if (kstrtou16(buf, 0, &tmp_val) < 0) + return -EINVAL; + + ret = set_ec_ext_power_limit(ec, tmp_val, ext_voltage_lim); + if (ret < 0) + return ret; + + ext_current_lim = tmp_val; + if (ext_current_lim == EC_POWER_LIMIT_NONE) + dev_info(ec->dev, "External current limit removed\n"); + else + dev_info(ec->dev, "External current limit set to %dmA\n", + ext_current_lim); + + return count; +} + +static ssize_t get_ec_ext_voltage_lim(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", ext_voltage_lim); +} + +static ssize_t set_ec_ext_voltage_lim(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + uint16_t tmp_val; + + struct cros_ec_dev *ec = container_of( + dev, struct cros_ec_dev, class_dev); + + if (kstrtou16(buf, 0, &tmp_val) < 0) + return -EINVAL; + + ret = set_ec_ext_power_limit(ec, ext_current_lim, tmp_val); + if (ret < 0) + return ret; + + ext_voltage_lim = tmp_val; + if (ext_voltage_lim == EC_POWER_LIMIT_NONE) + dev_info(ec->dev, "External voltage limit removed\n"); + else + dev_info(ec->dev, "External voltage limit set to %dmV\n", + ext_voltage_lim); + + return count; +} + +static DEVICE_ATTR(ext_current_lim, S_IWUSR | S_IWGRP | S_IRUGO, + get_ec_ext_current_lim, + set_ec_ext_current_lim); +static DEVICE_ATTR(ext_voltage_lim, S_IWUSR | S_IWGRP | S_IRUGO, + get_ec_ext_voltage_lim, + set_ec_ext_voltage_lim); + +static struct attribute *__ext_power_cmds_attrs[] = { + &dev_attr_ext_current_lim.attr, + &dev_attr_ext_voltage_lim.attr, + NULL, +}; + +struct attribute_group cros_usb_pd_charger_attr_group = { + .name = "usb-pd-charger", + .attrs = __ext_power_cmds_attrs, +}; + +static SIMPLE_DEV_PM_OPS(cros_usb_pd_charger_pm_ops, + cros_usb_pd_charger_suspend, cros_usb_pd_charger_resume); + +static struct platform_driver cros_usb_pd_charger_driver = { + .driver = { + .name = "cros-usb-pd-charger", + .owner = THIS_MODULE, + .pm = &cros_usb_pd_charger_pm_ops, + }, + .probe = cros_usb_pd_charger_probe, + .remove = cros_usb_pd_charger_remove, +}; + +module_platform_driver(cros_usb_pd_charger_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Chrome USB PD charger"); +MODULE_ALIAS("power_supply:cros-usb-pd-charger");

[v2,6/8] power: cros_usbpd-charger: Add EC-based USB PD charger driver

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