msm: sysmon: Add the System Monitor communication library
The System Monitor communication library provides a single API that
can be used to send a notifications of peripheral state changes to
other peripherals using SMD channels.
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
diff --git a/arch/arm/mach-msm/sysmon.c b/arch/arm/mach-msm/sysmon.c
new file mode 100644
index 0000000..9296450
--- /dev/null
+++ b/arch/arm/mach-msm/sysmon.c
@@ -0,0 +1,170 @@
+/*
+ * 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");