| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Logging driver for ChromeOS EC based USBPD Charger. |
| * |
| * Copyright 2018 Google LLC. |
| */ |
| |
| #include <linux/ktime.h> |
| #include <linux/mfd/cros_ec.h> |
| #include <linux/math64.h> |
| #include <linux/module.h> |
| #include <linux/platform_data/cros_ec_commands.h> |
| #include <linux/platform_data/cros_ec_proto.h> |
| #include <linux/platform_device.h> |
| #include <linux/rtc.h> |
| |
| #define DRV_NAME "cros-usbpd-logger" |
| |
| #define CROS_USBPD_MAX_LOG_ENTRIES 30 |
| #define CROS_USBPD_LOG_UPDATE_DELAY msecs_to_jiffies(60000) |
| #define CROS_USBPD_DATA_SIZE 16 |
| #define CROS_USBPD_LOG_RESP_SIZE (sizeof(struct ec_response_pd_log) + \ |
| CROS_USBPD_DATA_SIZE) |
| #define CROS_USBPD_BUFFER_SIZE (sizeof(struct cros_ec_command) + \ |
| CROS_USBPD_LOG_RESP_SIZE) |
| /* Buffer for building the PDLOG string */ |
| #define BUF_SIZE 80 |
| |
| struct logger_data { |
| struct device *dev; |
| struct cros_ec_dev *ec_dev; |
| u8 ec_buffer[CROS_USBPD_BUFFER_SIZE]; |
| struct delayed_work log_work; |
| struct workqueue_struct *log_workqueue; |
| }; |
| |
| static const char * const chg_type_names[] = { |
| "None", "PD", "Type-C", "Proprietary", "DCP", "CDP", "SDP", |
| "Other", "VBUS" |
| }; |
| |
| static const char * const role_names[] = { |
| "Disconnected", "SRC", "SNK", "SNK (not charging)" |
| }; |
| |
| static const char * const fault_names[] = { |
| "---", "OCP", "fast OCP", "OVP", "Discharge" |
| }; |
| |
| static int append_str(char *buf, int pos, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i = vsnprintf(buf + pos, BUF_SIZE - pos, fmt, args); |
| va_end(args); |
| |
| return i; |
| } |
| |
| static struct ec_response_pd_log *ec_get_log_entry(struct logger_data *logger) |
| { |
| struct cros_ec_dev *ec_dev = logger->ec_dev; |
| struct cros_ec_command *msg; |
| int ret; |
| |
| msg = (struct cros_ec_command *)logger->ec_buffer; |
| |
| msg->command = ec_dev->cmd_offset + EC_CMD_PD_GET_LOG_ENTRY; |
| msg->insize = CROS_USBPD_LOG_RESP_SIZE; |
| |
| ret = cros_ec_cmd_xfer_status(ec_dev->ec_dev, msg); |
| if (ret < 0) |
| return ERR_PTR(ret); |
| |
| return (struct ec_response_pd_log *)msg->data; |
| } |
| |
| static void cros_usbpd_print_log_entry(struct ec_response_pd_log *r, |
| ktime_t tstamp) |
| { |
| const char *fault, *role, *chg_type; |
| struct usb_chg_measures *meas; |
| struct mcdp_info *minfo; |
| int role_idx, type_idx; |
| char buf[BUF_SIZE + 1]; |
| struct rtc_time rt; |
| int len = 0; |
| s32 rem; |
| int i; |
| |
| /* The timestamp is the number of 1024th of seconds in the past */ |
| tstamp = ktime_sub_us(tstamp, 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) |
| len += append_str(buf, len, "override "); |
| |
| if (r->data & CHARGE_FLAGS_DELAYED_OVERRIDE) |
| len += append_str(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) { |
| len += append_str(buf, len, "%s", role); |
| break; |
| } |
| |
| meas = (struct usb_chg_measures *)r->payload; |
| len += append_str(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: |
| len += append_str(buf, len, "RW signature check failed"); |
| break; |
| case PD_EVENT_PS_FAULT: |
| fault = r->data < ARRAY_SIZE(fault_names) ? fault_names[r->data] |
| : "???"; |
| len += append_str(buf, len, "Power supply fault: %s", fault); |
| break; |
| case PD_EVENT_VIDEO_DP_MODE: |
| len += append_str(buf, len, "DP mode %sabled", r->data == 1 ? |
| "en" : "dis"); |
| break; |
| case PD_EVENT_VIDEO_CODEC: |
| minfo = (struct mcdp_info *)r->payload; |
| len += append_str(buf, len, "HDMI info: family:%04x chipid:%04x ", |
| MCDP_FAMILY(minfo->family), |
| MCDP_CHIPID(minfo->chipid)); |
| len += append_str(buf, len, "irom:%d.%d.%d fw:%d.%d.%d", |
| minfo->irom.major, minfo->irom.minor, |
| minfo->irom.build, minfo->fw.major, |
| minfo->fw.minor, minfo->fw.build); |
| break; |
| default: |
| len += append_str(buf, len, "Event %02x (%04x) [", r->type, |
| r->data); |
| |
| for (i = 0; i < PD_LOG_SIZE(r->size_port); i++) |
| len += append_str(buf, len, "%02x ", r->payload[i]); |
| |
| len += append_str(buf, len, "]"); |
| break; |
| } |
| |
| div_s64_rem(ktime_to_ms(tstamp), MSEC_PER_SEC, &rem); |
| 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, rem, |
| PD_LOG_PORT(r->size_port), buf); |
| } |
| |
| static void cros_usbpd_log_check(struct work_struct *work) |
| { |
| struct logger_data *logger = container_of(to_delayed_work(work), |
| struct logger_data, |
| log_work); |
| struct device *dev = logger->dev; |
| struct ec_response_pd_log *r; |
| int entries = 0; |
| ktime_t now; |
| |
| while (entries++ < CROS_USBPD_MAX_LOG_ENTRIES) { |
| r = ec_get_log_entry(logger); |
| now = ktime_get_real(); |
| if (IS_ERR(r)) { |
| dev_dbg(dev, "Cannot get PD log %ld\n", PTR_ERR(r)); |
| break; |
| } |
| if (r->type == PD_EVENT_NO_ENTRY) |
| break; |
| |
| cros_usbpd_print_log_entry(r, now); |
| } |
| |
| queue_delayed_work(logger->log_workqueue, &logger->log_work, |
| CROS_USBPD_LOG_UPDATE_DELAY); |
| } |
| |
| static int cros_usbpd_logger_probe(struct platform_device *pd) |
| { |
| struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); |
| struct device *dev = &pd->dev; |
| struct logger_data *logger; |
| |
| logger = devm_kzalloc(dev, sizeof(*logger), GFP_KERNEL); |
| if (!logger) |
| return -ENOMEM; |
| |
| logger->dev = dev; |
| logger->ec_dev = ec_dev; |
| |
| platform_set_drvdata(pd, logger); |
| |
| /* Retrieve PD event logs periodically */ |
| INIT_DELAYED_WORK(&logger->log_work, cros_usbpd_log_check); |
| logger->log_workqueue = create_singlethread_workqueue("cros_usbpd_log"); |
| if (!logger->log_workqueue) |
| return -ENOMEM; |
| |
| queue_delayed_work(logger->log_workqueue, &logger->log_work, |
| CROS_USBPD_LOG_UPDATE_DELAY); |
| |
| return 0; |
| } |
| |
| static int cros_usbpd_logger_remove(struct platform_device *pd) |
| { |
| struct logger_data *logger = platform_get_drvdata(pd); |
| |
| cancel_delayed_work_sync(&logger->log_work); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused cros_usbpd_logger_resume(struct device *dev) |
| { |
| struct logger_data *logger = dev_get_drvdata(dev); |
| |
| queue_delayed_work(logger->log_workqueue, &logger->log_work, |
| CROS_USBPD_LOG_UPDATE_DELAY); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused cros_usbpd_logger_suspend(struct device *dev) |
| { |
| struct logger_data *logger = dev_get_drvdata(dev); |
| |
| cancel_delayed_work_sync(&logger->log_work); |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(cros_usbpd_logger_pm_ops, cros_usbpd_logger_suspend, |
| cros_usbpd_logger_resume); |
| |
| static struct platform_driver cros_usbpd_logger_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| .pm = &cros_usbpd_logger_pm_ops, |
| }, |
| .probe = cros_usbpd_logger_probe, |
| .remove = cros_usbpd_logger_remove, |
| }; |
| |
| module_platform_driver(cros_usbpd_logger_driver); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("Logging driver for ChromeOS EC USBPD Charger."); |
| MODULE_ALIAS("platform:" DRV_NAME); |