blob: 4b151cce3afa1e73f2d610832122a35b9c0766e4 [file] [log] [blame]
/*
* Copyright (c) 2011-2012, The Linux Foundation. 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 "hsic_sysmon.h"
#include "sysmon.h"
#define TX_BUF_SIZE 50
#define RX_BUF_SIZE 500
#define TIMEOUT_MS 5000
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;
};
static struct sysmon_subsys subsys[SYSMON_NUM_SS] = {
[SYSMON_SS_MODEM].transport = TRANSPORT_SMD,
[SYSMON_SS_LPASS].transport = TRANSPORT_SMD,
[SYSMON_SS_WCNSS].transport = TRANSPORT_SMD,
[SYSMON_SS_DSPS].transport = TRANSPORT_SMD,
[SYSMON_SS_Q6FW].transport = TRANSPORT_SMD,
[SYSMON_SS_EXT_MODEM].transport = TRANSPORT_HSIC,
};
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 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_hsic(struct sysmon_subsys *ss, const char *tx_buf,
size_t len)
{
int ret;
size_t actual_len;
pr_debug("Sending HSIC message: %s\n", tx_buf);
ret = hsic_sysmon_write(HSIC_SYSMON_DEV_EXT_MODEM,
tx_buf, len, TIMEOUT_MS);
if (ret)
return ret;
ret = hsic_sysmon_read(HSIC_SYSMON_DEV_EXT_MODEM, ss->rx_buf,
ARRAY_SIZE(ss->rx_buf), &actual_len, TIMEOUT_MS);
return ret;
}
static int sysmon_send_msg(struct sysmon_subsys *ss, const char *tx_buf,
size_t len)
{
int ret;
switch (ss->transport) {
case TRANSPORT_SMD:
ret = sysmon_send_smd(ss, tx_buf, len);
break;
case TRANSPORT_HSIC:
ret = sysmon_send_hsic(ss, tx_buf, len);
break;
default:
ret = -EINVAL;
}
if (!ret)
pr_debug("Received response: %s\n", ss->rx_buf);
return ret;
}
/**
* sysmon_send_event() - Notify a subsystem of another's state change
* @dest_ss: ID of subsystem the notification should be sent to
* @event_ss: String name 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 -ENOSYS if the destination subsystem
* responds, but with something other than an acknowledgement.
*
* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
*/
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[TX_BUF_SIZE];
int ret;
if (ss->dev == NULL)
return -ENODEV;
if (dest_ss < 0 || dest_ss >= SYSMON_NUM_SS ||
notif < 0 || notif >= SUBSYS_NOTIF_TYPE_COUNT ||
event_ss == 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)
goto out;
if (strncmp(ss->rx_buf, "ssr:ack", ARRAY_SIZE(ss->rx_buf)))
ret = -ENOSYS;
out:
mutex_unlock(&ss->lock);
return ret;
}
/**
* sysmon_send_shutdown() - send shutdown command to a
* subsystem.
* @dest_ss: ID of 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 -ENOSYS if the destination subsystem
* responds with something unexpected.
*
* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
*/
int sysmon_send_shutdown(enum subsys_id dest_ss)
{
struct sysmon_subsys *ss = &subsys[dest_ss];
const char tx_buf[] = "system:shutdown";
const char expect[] = "system:ack";
size_t prefix_len = ARRAY_SIZE(expect) - 1;
int ret;
if (ss->dev == NULL)
return -ENODEV;
if (dest_ss < 0 || dest_ss >= SYSMON_NUM_SS)
return -EINVAL;
mutex_lock(&ss->lock);
ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
if (ret)
goto out;
if (strncmp(ss->rx_buf, expect, prefix_len))
ret = -ENOSYS;
out:
mutex_unlock(&ss->lock);
return ret;
}
/**
* sysmon_get_reason() - Retrieve failure reason from a subsystem.
* @dest_ss: ID of 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 -ENOSYS if the destination subsystem
* responds with something unexpected.
*
* If CONFIG_MSM_SYSMON_COMM is not defined, always return success (0).
*/
int sysmon_get_reason(enum subsys_id dest_ss, char *buf, size_t len)
{
struct sysmon_subsys *ss = &subsys[dest_ss];
const char tx_buf[] = "ssr:retrieve:sfr";
const char expect[] = "ssr:return:";
size_t prefix_len = ARRAY_SIZE(expect) - 1;
int ret;
if (ss->dev == NULL)
return -ENODEV;
if (dest_ss < 0 || dest_ss >= SYSMON_NUM_SS ||
buf == NULL || len == 0)
return -EINVAL;
mutex_lock(&ss->lock);
ret = sysmon_send_msg(ss, tx_buf, ARRAY_SIZE(tx_buf));
if (ret)
goto out;
if (strncmp(ss->rx_buf, expect, prefix_len)) {
ret = -ENOSYS;
goto out;
}
strlcpy(buf, ss->rx_buf + prefix_len, len);
out:
mutex_unlock(&ss->lock);
return ret;
}
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 = &subsys[pdev->id];
mutex_init(&ss->lock);
switch (ss->transport) {
case TRANSPORT_SMD:
if (pdev->id >= SMD_NUM_TYPE)
return -EINVAL;
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);
break;
case TRANSPORT_HSIC:
if (pdev->id < SMD_NUM_TYPE)
return -EINVAL;
ret = hsic_sysmon_open(HSIC_SYSMON_DEV_EXT_MODEM);
if (ret) {
pr_err("HSIC open failed\n");
return ret;
}
break;
default:
return -EINVAL;
}
ss->dev = &pdev->dev;
return 0;
}
static int __devexit sysmon_remove(struct platform_device *pdev)
{
struct sysmon_subsys *ss = &subsys[pdev->id];
ss->dev = NULL;
mutex_lock(&ss->lock);
switch (ss->transport) {
case TRANSPORT_SMD:
smd_close(ss->chan);
break;
case TRANSPORT_HSIC:
hsic_sysmon_close(HSIC_SYSMON_DEV_EXT_MODEM);
break;
}
mutex_unlock(&ss->lock);
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");