908aa5ab01
QMP debugfs client driver do not support bind/unbind using sysfs. Set suppress bind attribute to disallow this. Change-Id: I954e57e58f3a7761ded4204b77faf4ca138cc35d Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017,2018, The Linux Foundation. All rights reserved. */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mailbox_client.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/platform_device.h>
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#include <linux/mailbox/qmp.h>
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#include <linux/uaccess.h>
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#include <linux/mailbox_controller.h>
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#define MAX_MSG_SIZE 96 /* Imposed by the remote*/
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struct qmp_debugfs_data {
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struct qmp_pkt pkt;
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char buf[MAX_MSG_SIZE + 1];
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};
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static struct qmp_debugfs_data data_pkt[MBOX_TX_QUEUE_LEN];
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static struct mbox_chan *chan;
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static struct mbox_client *cl;
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static DEFINE_MUTEX(qmp_debugfs_mutex);
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static ssize_t aop_msg_write(struct file *file, const char __user *userstr,
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size_t len, loff_t *pos)
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{
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static int count;
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int rc;
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if (!len || (len > MAX_MSG_SIZE))
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return len;
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mutex_lock(&qmp_debugfs_mutex);
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if (count >= MBOX_TX_QUEUE_LEN)
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count = 0;
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memset(&(data_pkt[count]), 0, sizeof(data_pkt[count]));
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rc = copy_from_user(data_pkt[count].buf, userstr, len);
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if (rc) {
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pr_err("%s copy from user failed, rc=%d\n", __func__, rc);
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mutex_unlock(&qmp_debugfs_mutex);
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return len;
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}
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/*
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* Controller expects a 4 byte aligned buffer
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*/
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data_pkt[count].pkt.size = (len + 0x3) & ~0x3;
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data_pkt[count].pkt.data = data_pkt[count].buf;
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if (mbox_send_message(chan, &(data_pkt[count].pkt)) < 0)
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pr_err("Failed to send qmp request\n");
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else
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count++;
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mutex_unlock(&qmp_debugfs_mutex);
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return len;
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}
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static const struct file_operations aop_msg_fops = {
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.write = aop_msg_write,
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};
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static int qmp_msg_probe(struct platform_device *pdev)
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{
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struct dentry *file;
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cl = devm_kzalloc(&pdev->dev, sizeof(*cl), GFP_KERNEL);
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if (!cl)
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return -ENOMEM;
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cl->dev = &pdev->dev;
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cl->tx_block = true;
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cl->tx_tout = 1000;
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cl->knows_txdone = false;
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chan = mbox_request_channel(cl, 0);
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if (IS_ERR(chan)) {
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dev_err(&pdev->dev, "Failed to mbox channel\n");
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return PTR_ERR(chan);
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}
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file = debugfs_create_file("aop_send_message", 0220, NULL, NULL,
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&aop_msg_fops);
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if (!file)
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goto err;
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return 0;
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err:
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mbox_free_channel(chan);
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chan = NULL;
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return -ENOMEM;
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}
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static const struct of_device_id aop_qmp_match_tbl[] = {
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{.compatible = "qcom,debugfs-qmp-client"},
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{},
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};
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static struct platform_driver aop_qmp_msg_driver = {
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.probe = qmp_msg_probe,
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.driver = {
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.name = "debugfs-qmp-client",
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.owner = THIS_MODULE,
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.suppress_bind_attrs = true,
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.of_match_table = aop_qmp_match_tbl,
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},
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};
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builtin_platform_driver(aop_qmp_msg_driver);
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