[V6,1/2] soc: qcom: aoss: Expose send for generic usecase

Commit Message

Deepak Kumar Singh Aug. 16, 2021, 11:39 a.m. UTC

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 <[e-mail]>
Signed-off-by: Deepak Kumar Singh <[e-mail]>
---
 drivers/soc/qcom/qcom_aoss.c       | 51 +++++++++++++++++++++++++++++++++++++-
 include/linux/soc/qcom/qcom_aoss.h | 38 ++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/soc/qcom/qcom_aoss.h

Comments

Stephen Boyd Aug. 24, 2021, 6:34 p.m. UTC | #1

Quoting Deepak Kumar Singh (2021-08-16 04:39:13)
> 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 <[e-mail]>
> Signed-off-by: Deepak Kumar Singh <[e-mail]>
> ---

With one nit below

Reviewed-by: Stephen Boyd <[e-mail]>

> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> index 934fcc4..a43c22c 100644
> --- a/drivers/soc/qcom/qcom_aoss.c
> +++ b/drivers/soc/qcom/qcom_aoss.c
> @@ -515,6 +521,48 @@ 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() - Match get_device() inside of_find_device_by_node()
> + *            in qmp_get()

I meant to put this comment next to the put_device() call. This should
say something like "release a qmp handle" and then the existing comment
moved down to the if below.

> + * @qmp: qmp handle obtained from qmp_get()
> + */
> +void qmp_put(struct qmp *qmp)
> +{
> +       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;

Patch

diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index 934fcc4..a43c22c 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 +521,48 @@  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() - Match get_device() inside of_find_device_by_node()
+ * 	       in qmp_get()
+ * @qmp: qmp handle obtained from qmp_get()
+ */
+void qmp_put(struct qmp *qmp)
+{
+	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 +658,7 @@  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