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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016, Linaro Ltd.
* Copyright (c) 2015, Sony Mobile Communications Inc.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rpmsg.h>
#include <linux/of.h>
#include <linux/soc/qcom/wcnss_ctrl.h>
#include <linux/platform_device.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "btqca.h"
struct btqcomsmd {
struct hci_dev *hdev;
struct rpmsg_endpoint *acl_channel;
struct rpmsg_endpoint *cmd_channel;
};
static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
const void *data, size_t count)
{
struct sk_buff *skb;
/* Use GFP_ATOMIC as we're in IRQ context */
skb = bt_skb_alloc(count, GFP_ATOMIC);
if (!skb) {
hdev->stat.err_rx++;
return -ENOMEM;
}
hci_skb_pkt_type(skb) = type;
skb_put_data(skb, data, count);
return hci_recv_frame(hdev, skb);
}
static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
int count, void *priv, u32 addr)
{
struct btqcomsmd *btq = priv;
btq->hdev->stat.byte_rx += count;
return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
}
static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
int count, void *priv, u32 addr)
{
struct btqcomsmd *btq = priv;
btq->hdev->stat.byte_rx += count;
return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
}
static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
{
struct btqcomsmd *btq = hci_get_drvdata(hdev);
int ret;
switch (hci_skb_pkt_type(skb)) {
case HCI_ACLDATA_PKT:
ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
if (ret) {
hdev->stat.err_tx++;
break;
}
hdev->stat.acl_tx++;
hdev->stat.byte_tx += skb->len;
break;
case HCI_COMMAND_PKT:
ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
if (ret) {
hdev->stat.err_tx++;
break;
}
hdev->stat.cmd_tx++;
hdev->stat.byte_tx += skb->len;
break;
default:
ret = -EILSEQ;
break;
}
if (!ret)
kfree_skb(skb);
return ret;
}
static int btqcomsmd_open(struct hci_dev *hdev)
{
return 0;
}
static int btqcomsmd_close(struct hci_dev *hdev)
{
return 0;
}
static int btqcomsmd_setup(struct hci_dev *hdev)
{
struct sk_buff *skb;
skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
/* Devices do not have persistent storage for BD address. Retrieve
* it from the firmware node property.
*/
set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
return 0;
}
static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
int ret;
ret = qca_set_bdaddr_rome(hdev, bdaddr);
if (ret)
return ret;
/* The firmware stops responding for a while after setting the bdaddr,
* causing timeouts for subsequent commands. Sleep a bit to avoid this.
*/
usleep_range(1000, 10000);
return 0;
}
static int btqcomsmd_probe(struct platform_device *pdev)
{
struct btqcomsmd *btq;
struct hci_dev *hdev;
void *wcnss;
int ret;
btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
if (!btq)
return -ENOMEM;
wcnss = dev_get_drvdata(pdev->dev.parent);
btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
btqcomsmd_acl_callback, btq);
if (IS_ERR(btq->acl_channel))
return PTR_ERR(btq->acl_channel);
btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
btqcomsmd_cmd_callback, btq);
if (IS_ERR(btq->cmd_channel)) {
ret = PTR_ERR(btq->cmd_channel);
goto destroy_acl_channel;
}
hdev = hci_alloc_dev();
if (!hdev) {
ret = -ENOMEM;
goto destroy_cmd_channel;
}
hci_set_drvdata(hdev, btq);
btq->hdev = hdev;
SET_HCIDEV_DEV(hdev, &pdev->dev);
hdev->bus = HCI_SMD;
hdev->open = btqcomsmd_open;
hdev->close = btqcomsmd_close;
hdev->send = btqcomsmd_send;
hdev->setup = btqcomsmd_setup;
hdev->set_bdaddr = btqcomsmd_set_bdaddr;
ret = hci_register_dev(hdev);
if (ret < 0)
goto hci_free_dev;
platform_set_drvdata(pdev, btq);
return 0;
hci_free_dev:
hci_free_dev(hdev);
destroy_cmd_channel:
rpmsg_destroy_ept(btq->cmd_channel);
destroy_acl_channel:
rpmsg_destroy_ept(btq->acl_channel);
return ret;
}
static int btqcomsmd_remove(struct platform_device *pdev)
{
struct btqcomsmd *btq = platform_get_drvdata(pdev);
hci_unregister_dev(btq->hdev);
hci_free_dev(btq->hdev);
rpmsg_destroy_ept(btq->cmd_channel);
rpmsg_destroy_ept(btq->acl_channel);
return 0;
}
static const struct of_device_id btqcomsmd_of_match[] = {
{ .compatible = "qcom,wcnss-bt", },
{ },
};
MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
static struct platform_driver btqcomsmd_driver = {
.probe = btqcomsmd_probe,
.remove = btqcomsmd_remove,
.driver = {
.name = "btqcomsmd",
.of_match_table = btqcomsmd_of_match,
},
};
module_platform_driver(btqcomsmd_driver);
MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
MODULE_LICENSE("GPL v2");
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