soc: qcom: aoss: Expose send for generic usecase

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@codeaurora.org>
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1630420228-31075-2-git-send-email-deesin@codeaurora.org

diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index 536c3e4114fb9da4fb2e37a6aad2f998532d9de3..bb336cc8df6f69c969c83e6146e6478bcd3a76ef 100644 (file)
--- 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)
 {
@@ -519,6 +525,51 @@ 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;
@@ -615,6 +666,7 @@ 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 (file)
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