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Commit 9e430a6e authored by Chris Lew's avatar Chris Lew
Browse files

soc: qcom: Add snapshot of MSM QMP debugfs client 



This snapshot is taken as of msm-4.19 'commit <dac6e981b55e>
("Merge "icnss: Skip removing WLAN host driver during recovery"")'.

In addition, update copyright.

Change-Id: If2810d0e21f21dd26c5e9202728dc8b9a8e3c59c
Signed-off-by: default avatarChris Lew <clew@codeaurora.org>
parent 63d831d0

drivers/soc/qcom/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -229,4 +229,13 @@ config QCOM_SECURE_BUFFER 
	  memory buffers. This ensures that only the correct clients can

	  use this memory and no unauthorized access is made to the

	  buffer.



config QMP_DEBUGFS_CLIENT

	bool "Debugfs Client to communicate with AOP using QMP protocol"

	depends on DEBUG_FS

	help

	  This options enables a driver which allows clients to send messages

	  to Alway On processor using QMP transport. Users can echo a message

	  into an exposed debugfs node to send to AOP. The driver expects the

	  passed in string argument to be formatted correctly for AOP to read.

endmenu

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -29,3 +29,4 @@ obj-$(CONFIG_QCOM_LAHAINA_LLCC) += llcc-lahaina.o 
obj-$(CONFIG_QCOM_SDM845_LLCC) += llcc-sdm845.o

obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o

obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o

obj-$(CONFIG_QMP_DEBUGFS_CLIENT) += qmp-debugfs-client.o

drivers/soc/qcom/qmp-debugfs-client.c

0 → 100644
+114 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only



/* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved. */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/mailbox_client.h>

#include <linux/seq_file.h>

#include <linux/debugfs.h>

#include <linux/platform_device.h>

#include <linux/mailbox/qmp.h>

#include <linux/uaccess.h>

#include <linux/mailbox_controller.h>



#define MAX_MSG_SIZE 96 /* Imposed by the remote*/



struct qmp_debugfs_data {

	struct qmp_pkt pkt;

	char buf[MAX_MSG_SIZE + 1];

};



static struct qmp_debugfs_data data_pkt[MBOX_TX_QUEUE_LEN];

static struct mbox_chan *chan;

static struct mbox_client *cl;



static DEFINE_MUTEX(qmp_debugfs_mutex);



static ssize_t aop_msg_write(struct file *file, const char __user *userstr,

		size_t len, loff_t *pos)

{

	static int count;

	int rc;



	if (!len || (len > MAX_MSG_SIZE))

		return len;



	mutex_lock(&qmp_debugfs_mutex);



	if (count >= MBOX_TX_QUEUE_LEN)

		count = 0;



	memset(&(data_pkt[count]), 0, sizeof(data_pkt[count]));

	rc  = copy_from_user(data_pkt[count].buf, userstr, len);

	if (rc) {

		pr_err("%s copy from user failed, rc=%d\n", __func__, rc);

		mutex_unlock(&qmp_debugfs_mutex);

		return len;

	}



	/*

	 * Controller expects a 4 byte aligned buffer

	 */

	data_pkt[count].pkt.size = (len + 0x3) & ~0x3;

	data_pkt[count].pkt.data = data_pkt[count].buf;



	if (mbox_send_message(chan, &(data_pkt[count].pkt)) < 0)

		pr_err("Failed to send qmp request\n");

	else

		count++;



	mutex_unlock(&qmp_debugfs_mutex);

	return len;

}



static const struct file_operations aop_msg_fops = {

	.write = aop_msg_write,

};



static int qmp_msg_probe(struct platform_device *pdev)

{

	struct dentry *file;



	cl = devm_kzalloc(&pdev->dev, sizeof(*cl), GFP_KERNEL);

	if (!cl)

		return -ENOMEM;



	cl->dev = &pdev->dev;

	cl->tx_block = true;

	cl->tx_tout = 1000;

	cl->knows_txdone = false;



	chan = mbox_request_channel(cl, 0);

	if (IS_ERR(chan)) {

		dev_err(&pdev->dev, "Failed to mbox channel\n");

		return PTR_ERR(chan);

	}



	file = debugfs_create_file("aop_send_message", 0220, NULL, NULL,

			&aop_msg_fops);

	if (!file)

		goto err;

	return 0;

err:

	mbox_free_channel(chan);

	chan = NULL;

	return -ENOMEM;

}



static const struct of_device_id aop_qmp_match_tbl[] = {

	{.compatible = "qcom,debugfs-qmp-client"},

	{},

};



static struct platform_driver aop_qmp_msg_driver = {

	.probe = qmp_msg_probe,

	.driver = {

		.name = "debugfs-qmp-client",

		.owner = THIS_MODULE,

		.suppress_bind_attrs = true,

		.of_match_table = aop_qmp_match_tbl,

	},

};

builtin_platform_driver(aop_qmp_msg_driver);