diff mbox series

[V5,1/2] soc: qcom: aoss: Expose send for generic usecase

Message ID 1628161974-7182-2-git-send-email-deesin@codeaurora.org (mailing list archive)
State Superseded
Headers show
Series qcom aoss qmp_get and debugfs support patches | expand

Commit Message

Deepak Kumar Singh Aug. 5, 2021, 11:12 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 <clew@codeaurora.org>
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
---
 drivers/soc/qcom/qcom_aoss.c       | 46 +++++++++++++++++++++++++++++++++++++-
 include/linux/soc/qcom/qcom_aoss.h | 38 +++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/soc/qcom/qcom_aoss.h

Comments

Stephen Boyd Aug. 5, 2021, 6:34 p.m. UTC | #1 
Quoting Deepak Kumar Singh (2021-08-05 04:12:53)
> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> index 934fcc4..b84cb31 100644
> --- a/drivers/soc/qcom/qcom_aoss.c
> +++ b/drivers/soc/qcom/qcom_aoss.c
> @@ -515,6 +521,43 @@ 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);
> +
> +void qmp_put(struct qmp *qmp)
> +{
> +       if (!IS_ERR_OR_NULL(qmp))
> +               put_device(qmp->dev);

Where is the corresponding get_device() call?

> +}
> +EXPORT_SYMBOL(qmp_put);
> +
>  static int qmp_probe(struct platform_device *pdev)
>  {
>         struct resource *res;
Deepak Kumar Singh Aug. 9, 2021, 9:57 a.m. UTC | #2 
On 8/6/2021 12:04 AM, Stephen Boyd wrote:
> Quoting Deepak Kumar Singh (2021-08-05 04:12:53)
>> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
>> index 934fcc4..b84cb31 100644
>> --- a/drivers/soc/qcom/qcom_aoss.c
>> +++ b/drivers/soc/qcom/qcom_aoss.c
>> @@ -515,6 +521,43 @@ 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);
>> +
>> +void qmp_put(struct qmp *qmp)
>> +{
>> +       if (!IS_ERR_OR_NULL(qmp))
>> +               put_device(qmp->dev);
> Where is the corresponding get_device() call?
of_find_device_by_node() internally calls get_device(), so no need to 
call get_device() explicitly.
>
>> +}
>> +EXPORT_SYMBOL(qmp_put);
>> +
>>   static int qmp_probe(struct platform_device *pdev)
>>   {
>>          struct resource *res;
Stephen Boyd Aug. 9, 2021, 5:56 p.m. UTC | #3 
Quoting Deepak Kumar Singh (2021-08-09 02:57:26)
>
> On 8/6/2021 12:04 AM, Stephen Boyd wrote:
> > Quoting Deepak Kumar Singh (2021-08-05 04:12:53)
> >> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> >> index 934fcc4..b84cb31 100644
> >> --- a/drivers/soc/qcom/qcom_aoss.c
> >> +++ b/drivers/soc/qcom/qcom_aoss.c
> >> @@ -515,6 +521,43 @@ 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);
> >> +
> >> +void qmp_put(struct qmp *qmp)
> >> +{
> >> +       if (!IS_ERR_OR_NULL(qmp))
> >> +               put_device(qmp->dev);
> > Where is the corresponding get_device() call?
> of_find_device_by_node() internally calls get_device(), so no need to
> call get_device() explicitly.

Got it. Can you add a comment here so we remember?

	/*
	 * Match get_device() inside of_find_device_by_node() in
	 * qmp_get()
	 */

and it would be super useful if we could update the documentation on
that API, and the one it calls, so callers know about this.
diff mbox series

Patch

diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index 934fcc4..b84cb31 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 +521,43 @@  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);
+
+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 +653,7 @@  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