blob: 92964501baa01bd9b0fdd6b788cef9c7cc7bcc89 [file] [log] [blame]
/*
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#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 <mach/msm_smd.h>
#include <mach/subsystem_notif.h>
#include "sysmon.h"
#define MAX_MSG_LENGTH 50
#define TIMEOUT_MS 5000
struct sysmon_subsys {
struct mutex lock;
struct smd_channel *chan;
bool chan_open;
struct completion resp_ready;
char rx_buf[MAX_MSG_LENGTH];
};
static struct sysmon_subsys subsys[SYSMON_NUM_SS];
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",
};
int sysmon_send_event(enum subsys_id dest_ss, const char *event_ss,
enum subsys_notif_type notif)
{
struct sysmon_subsys *ss = &subsys[dest_ss];
char tx_buf[MAX_MSG_LENGTH];
int ret;
if (dest_ss < 0 || dest_ss >= SYSMON_NUM_SS ||
notif < 0 || notif >= SUBSYS_NOTIF_TYPE_COUNT ||
event_ss == NULL)
return -EINVAL;
if (!ss->chan_open)
return -ENODEV;
mutex_lock(&ss->lock);
init_completion(&ss->resp_ready);
snprintf(tx_buf, ARRAY_SIZE(tx_buf), "ssr:%s:%s", event_ss,
notif_name[notif]);
pr_debug("Sending message: %s\n", tx_buf);
smd_write(ss->chan, tx_buf, ARRAY_SIZE(tx_buf));
ret = wait_for_completion_timeout(&ss->resp_ready,
msecs_to_jiffies(TIMEOUT_MS));
if (!ret) {
ret = -ETIMEDOUT;
} else if (strncmp(ss->rx_buf, "ssr:ack", ARRAY_SIZE(ss->rx_buf))) {
pr_debug("Received response: %s\n", ss->rx_buf);
ret = -ENOSYS;
} else {
ret = 0;
}
mutex_unlock(&ss->lock);
return ret;
}
static void sysmon_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)
{
static const uint32_t ss_map[SMD_NUM_TYPE] = {
[SMD_APPS_MODEM] = SYSMON_SS_MODEM,
[SMD_APPS_QDSP] = SYSMON_SS_LPASS,
[SMD_APPS_WCNSS] = SYSMON_SS_WCNSS,
[SMD_APPS_DSPS] = SYSMON_SS_DSPS,
[SMD_APPS_Q6FW] = SYSMON_SS_Q6FW,
};
struct sysmon_subsys *ss;
int ret;
if (pdev == NULL)
return -EINVAL;
if (pdev->id < 0 || pdev->id >= SMD_NUM_TYPE ||
ss_map[pdev->id] < 0 || ss_map[pdev->id] >= SYSMON_NUM_SS)
return -ENODEV;
ss = &subsys[ss_map[pdev->id]];
mutex_init(&ss->lock);
/* Open and configure the SMD channel */
ret = smd_named_open_on_edge("sys_mon", pdev->id, &ss->chan,
ss, sysmon_notify);
if (ret) {
pr_err("SMD open failed\n");
return -ENOSYS;
}
smd_disable_read_intr(ss->chan);
return 0;
}
static int __devexit sysmon_remove(struct platform_device *pdev)
{
smd_close(subsys[pdev->id].chan);
return 0;
}
static struct platform_driver sysmon_driver = {
.probe = sysmon_probe,
.remove = __devexit_p(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");