drivers/platform/chrome/cros_usbpd_logger.c - linux/kernel/git/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Logging driver for ChromeOS EC based USBPD Charger.
  *
  * Copyright 2018 Google LLC.
  */

 #include <linux/ktime.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"
 };

 __printf(3, 4)
 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);
 	destroy_workqueue(logger->log_workqueue);

 	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);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Logging driver for ChromeOS EC based USBPD Charger.
	*
	* Copyright 2018 Google LLC.
	*/

	#include <linux/ktime.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"
	};

	__printf(3, 4)
	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);
	destroy_workqueue(logger->log_workqueue);

	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);