drivers/soc/qcom/sysmon.c - kernel/msm-4.19 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2011-2014, 2016, 2018, The Linux Foundation. All rights reserved.
  */

 #define pr_fmt(fmt) "%s: " fmt, __func__
 #undef DEBUG

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/completion.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <soc/qcom/sysmon.h>
 #include <soc/qcom/subsystem_notif.h>
 #include <soc/qcom/smd.h>

 #define TX_BUF_SIZE	50
 #define RX_BUF_SIZE	500
 #define TIMEOUT_MS	500

 enum transports {
 	TRANSPORT_SMD,
 	TRANSPORT_HSIC,
 };

 struct sysmon_subsys {
 	struct mutex		lock;
 	struct smd_channel	*chan;
 	bool			chan_open;
 	struct completion	resp_ready;
 	char			rx_buf[RX_BUF_SIZE];
 	enum transports		transport;
 	struct device		*dev;
 	u32			pid;
 	struct list_head	list;
 };

 static const char *notif_name[SUBSYS_NOTIF_TYPE_COUNT] = {
 	[SUBSYS_BEFORE_SHUTDOWN] = "before_shutdown",
 	[SUBSYS_AFTER_SHUTDOWN]  = "after_shutdown",
 	[SUBSYS_BEFORE_POWERUP]  = "before_powerup",
 	[SUBSYS_AFTER_POWERUP]   = "after_powerup",
 };

 static LIST_HEAD(sysmon_list);
 static DEFINE_MUTEX(sysmon_list_lock);

 static int sysmon_send_smd(struct sysmon_subsys *ss, const char *tx_buf,
 			   size_t len)
 {
 	int ret;

 	if (!ss->chan_open)
 		return -ENODEV;

 	init_completion(&ss->resp_ready);
 	pr_debug("Sending SMD message: %s\n", tx_buf);
 	smd_write(ss->chan, tx_buf, len);
 	ret = wait_for_completion_timeout(&ss->resp_ready,
 				  msecs_to_jiffies(TIMEOUT_MS));
 	if (!ret)
 		return -ETIMEDOUT;

 	return 0;
 }


 static int sysmon_send_msg(struct sysmon_subsys *ss, const char *tx_buf,
 			   size_t len)
 {
 	int ret;

 	if (ss->transport == TRANSPORT_SMD)
 		ret = sysmon_send_smd(ss, tx_buf, len);
 	else
 		ret = -EINVAL;

 	if (!ret)
 		pr_debug("Received response: %s\n", ss->rx_buf);

 	return ret;
 }

 /**
  * sysmon_send_event_no_qmi() - Notify a subsystem of another's state change
  * @dest_desc:	Subsystem descriptor of the subsystem the notification
  * should be sent to
  * @event_desc:	Subsystem descriptor of the subsystem that generated the
  * notification
  * @notif:	ID of the notification type (ex. SUBSYS_BEFORE_SHUTDOWN)
  *
  * Returns 0 for success, -EINVAL for invalid destination or notification IDs,
  * -ENODEV if the transport channel is not open, -ETIMEDOUT if the destination
  * subsystem does not respond, and -EPROTO if the destination subsystem
  * responds, but with something other than an acknowledgment.
  *
  * If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
  */
 int sysmon_send_event_no_qmi(struct subsys_desc *dest_desc,
 			struct subsys_desc *event_desc,
 			enum subsys_notif_type notif)
 {

 	char tx_buf[TX_BUF_SIZE];
 	int ret;
 	struct sysmon_subsys *tmp, *ss = NULL;
 	const char *event_ss = event_desc->name;

 	mutex_lock(&sysmon_list_lock);
 	list_for_each_entry(tmp, &sysmon_list, list)
 		if (tmp->pid == dest_desc->sysmon_pid)
 			ss = tmp;
 	mutex_unlock(&sysmon_list_lock);

 	if (ss == NULL)
 		return -EINVAL;

 	if (ss->dev == NULL)
 		return -ENODEV;

 	if (notif < 0 || notif >= SUBSYS_NOTIF_TYPE_COUNT || event_ss == NULL ||
 						notif_name[notif] == NULL)
 		return -EINVAL;

 	snprintf(tx_buf, ARRAY_SIZE(tx_buf), "ssr:%s:%s", event_ss,
 		 notif_name[notif]);

 	mutex_lock(&ss->lock);
 	ret = sysmon_send_msg(ss, tx_buf, strlen(tx_buf));
 	if (ret) {
 		pr_err("Message sending failed %d\n", ret);
 		goto out;
 	}

 	if (strcmp(ss->rx_buf, "ssr:ack")) {
 		pr_debug("Unexpected response %s\n", ss->rx_buf);
 		ret = -EPROTO;
 	}
 out:
 	mutex_unlock(&ss->lock);
 	return ret;
 }
 EXPORT_SYMBOL(sysmon_send_event_no_qmi);

 /**
  * sysmon_send_shutdown_no_qmi() - send shutdown command to a subsystem.
  * @dest_desc:	Subsystem descriptor of the subsystem to send to
  *
  * Returns 0 for success, -EINVAL for an invalid destination, -ENODEV if
  * the SMD transport channel is not open, -ETIMEDOUT if the destination
  * subsystem does not respond, and -EPROTO if the destination subsystem
  * responds with something unexpected.
  *
  * If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
  */
 int sysmon_send_shutdown_no_qmi(struct subsys_desc *dest_desc)
 {
 	struct sysmon_subsys *tmp, *ss = NULL;
 	const char tx_buf[] = "system:shutdown";
 	const char expect[] = "system:ack";
 	int ret;

 	mutex_lock(&sysmon_list_lock);
 	list_for_each_entry(tmp, &sysmon_list, list)
 		if (tmp->pid == dest_desc->sysmon_pid)
 			ss = tmp;
 	mutex_unlock(&sysmon_list_lock);

 	if (ss == NULL)
 		return -EINVAL;

 	if (ss->dev == NULL)
 		return -ENODEV;

 	mutex_lock(&ss->lock);
 	ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
 	if (ret) {
 		pr_err("Message sending failed %d\n", ret);
 		goto out;
 	}

 	if (strcmp(ss->rx_buf, expect)) {
 		pr_err("Unexpected response %s\n", ss->rx_buf);
 		ret = -EPROTO;
 	}
 out:
 	mutex_unlock(&ss->lock);
 	return ret;
 }
 EXPORT_SYMBOL(sysmon_send_shutdown_no_qmi);

 /**
  * sysmon_get_reason_no_qmi() - Retrieve failure reason from a subsystem.
  * @dest_desc:	Subsystem descriptor of the subsystem to query
  * @buf:	Caller-allocated buffer for the returned NUL-terminated reason
  * @len:	Length of @buf
  *
  * Returns 0 for success, -EINVAL for an invalid destination, -ENODEV if
  * the SMD transport channel is not open, -ETIMEDOUT if the destination
  * subsystem does not respond, and -EPROTO if the destination subsystem
  * responds with something unexpected.
  *
  * If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
  */
 int sysmon_get_reason_no_qmi(struct subsys_desc *dest_desc,
 				char *buf, size_t len)
 {
 	struct sysmon_subsys *tmp, *ss = NULL;
 	const char tx_buf[] = "ssr:retrieve:sfr";
 	const char expect[] = "ssr:return:";
 	size_t prefix_len = ARRAY_SIZE(expect) - 1;
 	int ret;

 	mutex_lock(&sysmon_list_lock);
 	list_for_each_entry(tmp, &sysmon_list, list)
 		if (tmp->pid == dest_desc->sysmon_pid)
 			ss = tmp;
 	mutex_unlock(&sysmon_list_lock);

 	if (ss == NULL || buf == NULL || len == 0)
 		return -EINVAL;

 	if (ss->dev == NULL)
 		return -ENODEV;

 	mutex_lock(&ss->lock);
 	ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
 	if (ret) {
 		pr_err("Message sending failed %d\n", ret);
 		goto out;
 	}

 	if (strncmp(ss->rx_buf, expect, prefix_len)) {
 		pr_err("Unexpected response %s\n", ss->rx_buf);
 		ret = -EPROTO;
 		goto out;
 	}
 	strlcpy(buf, ss->rx_buf + prefix_len, len);
 out:
 	mutex_unlock(&ss->lock);
 	return ret;
 }
 EXPORT_SYMBOL(sysmon_get_reason_no_qmi);

 static void sysmon_smd_notify(void *priv, unsigned int smd_event)
 {
 	struct sysmon_subsys *ss = priv;

 	switch (smd_event) {
 	case SMD_EVENT_DATA: {
 		if (smd_read_avail(ss->chan) > 0) {
 			smd_read_from_cb(ss->chan, ss->rx_buf,
 					 ARRAY_SIZE(ss->rx_buf));
 			complete(&ss->resp_ready);
 		}
 		break;
 	}
 	case SMD_EVENT_OPEN:
 		ss->chan_open = true;
 		break;
 	case SMD_EVENT_CLOSE:
 		ss->chan_open = false;
 		break;
 	}
 }

 static int sysmon_probe(struct platform_device *pdev)
 {
 	struct sysmon_subsys *ss;
 	int ret;

 	if (pdev->id < 0 || pdev->id >= SYSMON_NUM_SS)
 		return -ENODEV;

 	ss = devm_kzalloc(&pdev->dev, sizeof(*ss), GFP_KERNEL);
 	if (!ss)
 		return -ENOMEM;

 	mutex_init(&ss->lock);
 	if (pdev->id < SMD_NUM_TYPE) {
 		ss->transport = TRANSPORT_SMD;
 		ret = smd_named_open_on_edge("sys_mon", pdev->id, &ss->chan,
 						ss, sysmon_smd_notify);
 		if (ret) {
 			pr_err("SMD open failed\n");
 			return ret;
 		}
 		smd_disable_read_intr(ss->chan);
 	} else
 		return -EINVAL;

 	ss->dev = &pdev->dev;
 	ss->pid = pdev->id;

 	mutex_lock(&sysmon_list_lock);
 	INIT_LIST_HEAD(&ss->list);
 	list_add_tail(&ss->list, &sysmon_list);
 	mutex_unlock(&sysmon_list_lock);
 	return 0;
 }

 static int sysmon_remove(struct platform_device *pdev)
 {
 	struct sysmon_subsys *sysmon, *tmp, *ss = NULL;

 	mutex_lock(&sysmon_list_lock);
 	list_for_each_entry_safe(sysmon, tmp, &sysmon_list, list) {
 		if (sysmon->pid == pdev->id) {
 			ss = sysmon;
 			list_del(&ss->list);
 		}
 	}
 	mutex_unlock(&sysmon_list_lock);

 	if (ss == NULL)
 		return -EINVAL;

 	mutex_lock(&ss->lock);
 	if (ss->transport == TRANSPORT_SMD)
 		smd_close(ss->chan);

 	mutex_unlock(&ss->lock);

 	return 0;
 }

 static struct platform_driver sysmon_driver = {
 	.probe		= sysmon_probe,
 	.remove		= sysmon_remove,
 	.driver		= {
 		.name		= "sys_mon",
 		.owner		= THIS_MODULE,
 	},
 };

 static int __init sysmon_init(void)
 {
 	return platform_driver_register(&sysmon_driver);
 }
 subsys_initcall(sysmon_init);

 static void __exit sysmon_exit(void)
 {
 	platform_driver_unregister(&sysmon_driver);
 }
 module_exit(sysmon_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("system monitor communication library");
 MODULE_ALIAS("platform:sys_mon");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2011-2014, 2016, 2018, The Linux Foundation. All rights reserved.
	*/

	#define pr_fmt(fmt) "%s: " fmt, __func__
	#undef DEBUG

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/completion.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <soc/qcom/sysmon.h>
	#include <soc/qcom/subsystem_notif.h>
	#include <soc/qcom/smd.h>

	#define TX_BUF_SIZE 50
	#define RX_BUF_SIZE 500
	#define TIMEOUT_MS 500

	enum transports {
	TRANSPORT_SMD,
	TRANSPORT_HSIC,
	};

	struct sysmon_subsys {
	struct mutex lock;
	struct smd_channel *chan;
	bool chan_open;
	struct completion resp_ready;
	char rx_buf[RX_BUF_SIZE];
	enum transports transport;
	struct device *dev;
	u32 pid;
	struct list_head list;
	};

	static const char *notif_name[SUBSYS_NOTIF_TYPE_COUNT] = {
	[SUBSYS_BEFORE_SHUTDOWN] = "before_shutdown",
	[SUBSYS_AFTER_SHUTDOWN] = "after_shutdown",
	[SUBSYS_BEFORE_POWERUP] = "before_powerup",
	[SUBSYS_AFTER_POWERUP] = "after_powerup",
	};

	static LIST_HEAD(sysmon_list);
	static DEFINE_MUTEX(sysmon_list_lock);

	static int sysmon_send_smd(struct sysmon_subsys ss, const char tx_buf,
	size_t len)
	{
	int ret;

	if (!ss->chan_open)
	return -ENODEV;

	init_completion(&ss->resp_ready);
	pr_debug("Sending SMD message: %s\n", tx_buf);
	smd_write(ss->chan, tx_buf, len);
	ret = wait_for_completion_timeout(&ss->resp_ready,
	msecs_to_jiffies(TIMEOUT_MS));
	if (!ret)
	return -ETIMEDOUT;

	return 0;
	}


	static int sysmon_send_msg(struct sysmon_subsys ss, const char tx_buf,
	size_t len)
	{
	int ret;

	if (ss->transport == TRANSPORT_SMD)
	ret = sysmon_send_smd(ss, tx_buf, len);
	else
	ret = -EINVAL;

	if (!ret)
	pr_debug("Received response: %s\n", ss->rx_buf);

	return ret;
	}

	/**
	* sysmon_send_event_no_qmi() - Notify a subsystem of another's state change
	* @dest_desc: Subsystem descriptor of the subsystem the notification
	* should be sent to
	* @event_desc: Subsystem descriptor of the subsystem that generated the
	* notification
	* @notif: ID of the notification type (ex. SUBSYS_BEFORE_SHUTDOWN)
	*
	* Returns 0 for success, -EINVAL for invalid destination or notification IDs,
	* -ENODEV if the transport channel is not open, -ETIMEDOUT if the destination
	* subsystem does not respond, and -EPROTO if the destination subsystem
	* responds, but with something other than an acknowledgment.
	*
	* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
	*/
	int sysmon_send_event_no_qmi(struct subsys_desc *dest_desc,
	struct subsys_desc *event_desc,
	enum subsys_notif_type notif)
	{

	char tx_buf[TX_BUF_SIZE];
	int ret;
	struct sysmon_subsys tmp, ss = NULL;
	const char *event_ss = event_desc->name;

	mutex_lock(&sysmon_list_lock);
	list_for_each_entry(tmp, &sysmon_list, list)
	if (tmp->pid == dest_desc->sysmon_pid)
	ss = tmp;
	mutex_unlock(&sysmon_list_lock);

	if (ss == NULL)
	return -EINVAL;

	if (ss->dev == NULL)
	return -ENODEV;

	if (notif < 0 \|\| notif >= SUBSYS_NOTIF_TYPE_COUNT \|\| event_ss == NULL \|\|
	notif_name[notif] == NULL)
	return -EINVAL;

	snprintf(tx_buf, ARRAY_SIZE(tx_buf), "ssr:%s:%s", event_ss,
	notif_name[notif]);

	mutex_lock(&ss->lock);
	ret = sysmon_send_msg(ss, tx_buf, strlen(tx_buf));
	if (ret) {
	pr_err("Message sending failed %d\n", ret);
	goto out;
	}

	if (strcmp(ss->rx_buf, "ssr:ack")) {
	pr_debug("Unexpected response %s\n", ss->rx_buf);
	ret = -EPROTO;
	}
	out:
	mutex_unlock(&ss->lock);
	return ret;
	}
	EXPORT_SYMBOL(sysmon_send_event_no_qmi);

	/**
	* sysmon_send_shutdown_no_qmi() - send shutdown command to a subsystem.
	* @dest_desc: Subsystem descriptor of the subsystem to send to
	*
	* Returns 0 for success, -EINVAL for an invalid destination, -ENODEV if
	* the SMD transport channel is not open, -ETIMEDOUT if the destination
	* subsystem does not respond, and -EPROTO if the destination subsystem
	* responds with something unexpected.
	*
	* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
	*/
	int sysmon_send_shutdown_no_qmi(struct subsys_desc *dest_desc)
	{
	struct sysmon_subsys tmp, ss = NULL;
	const char tx_buf[] = "system:shutdown";
	const char expect[] = "system:ack";
	int ret;

	mutex_lock(&sysmon_list_lock);
	list_for_each_entry(tmp, &sysmon_list, list)
	if (tmp->pid == dest_desc->sysmon_pid)
	ss = tmp;
	mutex_unlock(&sysmon_list_lock);

	if (ss == NULL)
	return -EINVAL;

	if (ss->dev == NULL)
	return -ENODEV;

	mutex_lock(&ss->lock);
	ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
	if (ret) {
	pr_err("Message sending failed %d\n", ret);
	goto out;
	}

	if (strcmp(ss->rx_buf, expect)) {
	pr_err("Unexpected response %s\n", ss->rx_buf);
	ret = -EPROTO;
	}
	out:
	mutex_unlock(&ss->lock);
	return ret;
	}
	EXPORT_SYMBOL(sysmon_send_shutdown_no_qmi);

	/**
	* sysmon_get_reason_no_qmi() - Retrieve failure reason from a subsystem.
	* @dest_desc: Subsystem descriptor of the subsystem to query
	* @buf: Caller-allocated buffer for the returned NUL-terminated reason
	* @len: Length of @buf
	*
	* Returns 0 for success, -EINVAL for an invalid destination, -ENODEV if
	* the SMD transport channel is not open, -ETIMEDOUT if the destination
	* subsystem does not respond, and -EPROTO if the destination subsystem
	* responds with something unexpected.
	*
	* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
	*/
	int sysmon_get_reason_no_qmi(struct subsys_desc *dest_desc,
	char *buf, size_t len)
	{
	struct sysmon_subsys tmp, ss = NULL;
	const char tx_buf[] = "ssr:retrieve:sfr";
	const char expect[] = "ssr:return:";
	size_t prefix_len = ARRAY_SIZE(expect) - 1;
	int ret;

	mutex_lock(&sysmon_list_lock);
	list_for_each_entry(tmp, &sysmon_list, list)
	if (tmp->pid == dest_desc->sysmon_pid)
	ss = tmp;
	mutex_unlock(&sysmon_list_lock);

	if (ss == NULL \|\| buf == NULL \|\| len == 0)
	return -EINVAL;

	if (ss->dev == NULL)
	return -ENODEV;

	mutex_lock(&ss->lock);
	ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
	if (ret) {
	pr_err("Message sending failed %d\n", ret);
	goto out;
	}

	if (strncmp(ss->rx_buf, expect, prefix_len)) {
	pr_err("Unexpected response %s\n", ss->rx_buf);
	ret = -EPROTO;
	goto out;
	}
	strlcpy(buf, ss->rx_buf + prefix_len, len);
	out:
	mutex_unlock(&ss->lock);
	return ret;
	}
	EXPORT_SYMBOL(sysmon_get_reason_no_qmi);

	static void sysmon_smd_notify(void *priv, unsigned int smd_event)
	{
	struct sysmon_subsys *ss = priv;

	switch (smd_event) {
	case SMD_EVENT_DATA: {
	if (smd_read_avail(ss->chan) > 0) {
	smd_read_from_cb(ss->chan, ss->rx_buf,
	ARRAY_SIZE(ss->rx_buf));
	complete(&ss->resp_ready);
	}
	break;
	}
	case SMD_EVENT_OPEN:
	ss->chan_open = true;
	break;
	case SMD_EVENT_CLOSE:
	ss->chan_open = false;
	break;
	}
	}

	static int sysmon_probe(struct platform_device *pdev)
	{
	struct sysmon_subsys *ss;
	int ret;

	if (pdev->id < 0 \|\| pdev->id >= SYSMON_NUM_SS)
	return -ENODEV;

	ss = devm_kzalloc(&pdev->dev, sizeof(*ss), GFP_KERNEL);
	if (!ss)
	return -ENOMEM;

	mutex_init(&ss->lock);
	if (pdev->id < SMD_NUM_TYPE) {
	ss->transport = TRANSPORT_SMD;
	ret = smd_named_open_on_edge("sys_mon", pdev->id, &ss->chan,
	ss, sysmon_smd_notify);
	if (ret) {
	pr_err("SMD open failed\n");
	return ret;
	}
	smd_disable_read_intr(ss->chan);
	} else
	return -EINVAL;

	ss->dev = &pdev->dev;
	ss->pid = pdev->id;

	mutex_lock(&sysmon_list_lock);
	INIT_LIST_HEAD(&ss->list);
	list_add_tail(&ss->list, &sysmon_list);
	mutex_unlock(&sysmon_list_lock);
	return 0;
	}

	static int sysmon_remove(struct platform_device *pdev)
	{
	struct sysmon_subsys sysmon, tmp, *ss = NULL;

	mutex_lock(&sysmon_list_lock);
	list_for_each_entry_safe(sysmon, tmp, &sysmon_list, list) {
	if (sysmon->pid == pdev->id) {
	ss = sysmon;
	list_del(&ss->list);
	}
	}
	mutex_unlock(&sysmon_list_lock);

	if (ss == NULL)
	return -EINVAL;

	mutex_lock(&ss->lock);
	if (ss->transport == TRANSPORT_SMD)
	smd_close(ss->chan);

	mutex_unlock(&ss->lock);

	return 0;
	}

	static struct platform_driver sysmon_driver = {
	.probe = sysmon_probe,
	.remove = sysmon_remove,
	.driver = {
	.name = "sys_mon",
	.owner = THIS_MODULE,
	},
	};

	static int __init sysmon_init(void)
	{
	return platform_driver_register(&sysmon_driver);
	}
	subsys_initcall(sysmon_init);

	static void __exit sysmon_exit(void)
	{
	platform_driver_unregister(&sysmon_driver);
	}
	module_exit(sysmon_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("system monitor communication library");
	MODULE_ALIAS("platform:sys_mon");