Not all upcoming usecases will have an interface to allow the aoss
driver to hook onto. Expose the send api and create a get function to
enable drivers to send their own messages to aoss.
Signed-off-by: Chris Lew <clew@xxxxxxxxxxxxxx>
Signed-off-by: Deepak Kumar Singh <deesin@xxxxxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
---
drivers/soc/qcom/qcom_aoss.c | 54 +++++++++++++++++++++++++++++++++++++-
include/linux/soc/qcom/qcom_aoss.h | 38 +++++++++++++++++++++++++++
2 files changed, 91 insertions(+), 1 deletion(-)
create mode 100644 include/linux/soc/qcom/qcom_aoss.h
diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index 934fcc4..c14da17 100644
--- a/drivers/soc/qcom/qcom_aoss.c
+++ b/drivers/soc/qcom/qcom_aoss.c
@@ -8,10 +8,12 @@
#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
+#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/thermal.h>
#include <linux/slab.h>
+#include <linux/soc/qcom/qcom_aoss.h>
#define QMP_DESC_MAGIC 0x0
#define QMP_DESC_VERSION 0x4
@@ -223,11 +225,14 @@ static bool qmp_message_empty(struct qmp *qmp)
*
* Return: 0 on success, negative errno on failure
*/
-static int qmp_send(struct qmp *qmp, const void *data, size_t len)
+int qmp_send(struct qmp *qmp, const void *data, size_t len)
{
long time_left;
int ret;
+ if (WARN_ON(IS_ERR_OR_NULL(qmp) || !data))
+ return -EINVAL;
+
if (WARN_ON(len + sizeof(u32) > qmp->size))
return -EINVAL;
@@ -261,6 +266,7 @@ static int qmp_send(struct qmp *qmp, const void *data, size_t len)
return ret;
}
+EXPORT_SYMBOL(qmp_send);
static int qmp_qdss_clk_prepare(struct clk_hw *hw)
{
@@ -515,6 +521,51 @@ static void qmp_cooling_devices_remove(struct qmp *qmp)
thermal_cooling_device_unregister(qmp->cooling_devs[i].cdev);
}
+/**
+ * qmp_get() - get a qmp handle from a device
+ * @dev: client device pointer
+ *
+ * Return: handle to qmp device on success, ERR_PTR() on failure
+ */
+struct qmp *qmp_get(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct device_node *np;
+ struct qmp *qmp;
+
+ if (!dev || !dev->of_node)
+ return ERR_PTR(-EINVAL);
+
+ np = of_parse_phandle(dev->of_node, "qcom,qmp", 0);
+ if (!np)
+ return ERR_PTR(-ENODEV);
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev)
+ return ERR_PTR(-EINVAL);
+
+ qmp = platform_get_drvdata(pdev);
+
+ return qmp ? qmp : ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL(qmp_get);
+
+/**
+ * qmp_put() - release a qmp handle
+ * @qmp: qmp handle obtained from qmp_get()
+ */
+void qmp_put(struct qmp *qmp)
+{
+ /*
+ * Match get_device() inside of_find_device_by_node() in
+ * qmp_get()
+ */
+ if (!IS_ERR_OR_NULL(qmp))
+ put_device(qmp->dev);
+}
+EXPORT_SYMBOL(qmp_put);
+
static int qmp_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -610,6 +661,7 @@ static struct platform_driver qmp_driver = {
.driver = {
.name = "qcom_aoss_qmp",
.of_match_table = qmp_dt_match,
+ .suppress_bind_attrs = true,
},
.probe = qmp_probe,
.remove = qmp_remove,
diff --git a/include/linux/soc/qcom/qcom_aoss.h b/include/linux/soc/qcom/qcom_aoss.h
new file mode 100644
index 0000000..3c2a82e
--- /dev/null
+++ b/include/linux/soc/qcom/qcom_aoss.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __QCOM_AOSS_H__
+#define __QCOM_AOSS_H__
+
+#include <linux/err.h>
+#include <linux/device.h>
+
+struct qmp;
+
+#if IS_ENABLED(CONFIG_QCOM_AOSS_QMP)
+
+int qmp_send(struct qmp *qmp, const void *data, size_t len);
+struct qmp *qmp_get(struct device *dev);
+void qmp_put(struct qmp *qmp);
+
+#else
+
+static inline int qmp_send(struct qmp *qmp, const void *data, size_t len)
+{
+ return -ENODEV;
+}
+
+static inline struct qmp *qmp_get(struct device *dev)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void qmp_put(struct qmp *qmp)
+{
+}
+
+#endif
+
+#endif
--
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a Linux Foundation Collaborative Project
