[linux-block.git] / drivers / bluetooth / btqcomsmd.c

// 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_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 = qca_set_bdaddr_rome;

	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");
Commit	Line	Data
97fb5e8d	1	// SPDX-License-Identifier: GPL-2.0-only
1511cc75 BA	2	/*
	3	* Copyright (c) 2016, Linaro Ltd.
	4	* Copyright (c) 2015, Sony Mobile Communications Inc.
1511cc75 BA	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/slab.h>
5052de8d	9	#include <linux/rpmsg.h>
766154b7 LP	10	#include <linux/of.h>
766154b7 LP	11
1511cc75 BA	12	#include <linux/soc/qcom/wcnss_ctrl.h>
	13	#include <linux/platform_device.h>
	14
	15	#include <net/bluetooth/bluetooth.h>
	16	#include <net/bluetooth/hci_core.h>
	17
	18	#include "btqca.h"
	19
	20	struct btqcomsmd {
	21	struct hci_dev *hdev;
	22
5052de8d BA	23	struct rpmsg_endpoint *acl_channel;
5052de8d BA	24	struct rpmsg_endpoint *cmd_channel;
1511cc75 BA	25	};
	26
	27	static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
	28	const void *data, size_t count)
	29	{
	30	struct sk_buff *skb;
	31
	32	/* Use GFP_ATOMIC as we're in IRQ context */
	33	skb = bt_skb_alloc(count, GFP_ATOMIC);
	34	if (!skb) {
	35	hdev->stat.err_rx++;
	36	return -ENOMEM;
	37	}
	38
	39	hci_skb_pkt_type(skb) = type;
59ae1d12	40	skb_put_data(skb, data, count);
1511cc75 BA	41
	42	return hci_recv_frame(hdev, skb);
	43	}
	44
5052de8d BA	45	static int btqcomsmd_acl_callback(struct rpmsg_device rpdev, void data,
5052de8d BA	46	int count, void *priv, u32 addr)
1511cc75	47	{
5052de8d	48	struct btqcomsmd *btq = priv;
1511cc75 BA	49
	50	btq->hdev->stat.byte_rx += count;
	51	return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
	52	}
	53
5052de8d BA	54	static int btqcomsmd_cmd_callback(struct rpmsg_device rpdev, void data,
5052de8d BA	55	int count, void *priv, u32 addr)
1511cc75	56	{
5052de8d	57	struct btqcomsmd *btq = priv;
1511cc75	58
61a1ecfc	59	btq->hdev->stat.byte_rx += count;
1511cc75 BA	60	return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
	61	}
	62
	63	static int btqcomsmd_send(struct hci_dev hdev, struct sk_buff skb)
	64	{
	65	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	66	int ret;
	67
	68	switch (hci_skb_pkt_type(skb)) {
	69	case HCI_ACLDATA_PKT:
5052de8d	70	ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
61a1ecfc LP	71	if (ret) {
	72	hdev->stat.err_tx++;
	73	break;
	74	}
1511cc75 BA	75	hdev->stat.acl_tx++;
	76	hdev->stat.byte_tx += skb->len;
	77	break;
	78	case HCI_COMMAND_PKT:
5052de8d	79	ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
61a1ecfc LP	80	if (ret) {
	81	hdev->stat.err_tx++;
	82	break;
	83	}
1511cc75	84	hdev->stat.cmd_tx++;
61a1ecfc	85	hdev->stat.byte_tx += skb->len;
1511cc75 BA	86	break;
	87	default:
	88	ret = -EILSEQ;
	89	break;
	90	}
	91
67b8fbea LP	92	if (!ret)
67b8fbea LP	93	kfree_skb(skb);
1511cc75 BA	94
	95	return ret;
	96	}
	97
	98	static int btqcomsmd_open(struct hci_dev *hdev)
	99	{
	100	return 0;
	101	}
	102
	103	static int btqcomsmd_close(struct hci_dev *hdev)
	104	{
	105	return 0;
	106	}
	107
6e518111 LP	108	static int btqcomsmd_setup(struct hci_dev *hdev)
6e518111 LP	109	{
6e518111	110	struct sk_buff *skb;
6e518111 LP	111
	112	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
	113	if (IS_ERR(skb))
	114	return PTR_ERR(skb);
	115	kfree_skb(skb);
	116
de79a9df MK	117	/* Devices do not have persistent storage for BD address. Retrieve
de79a9df MK	118	* it from the firmware node property.
6e518111	119	*/
de79a9df	120	set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
6e518111 LP	121
	122	return 0;
	123	}
	124
1511cc75 BA	125	static int btqcomsmd_probe(struct platform_device *pdev)
	126	{
	127	struct btqcomsmd *btq;
	128	struct hci_dev *hdev;
	129	void *wcnss;
	130	int ret;
	131
	132	btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
	133	if (!btq)
	134	return -ENOMEM;
	135
	136	wcnss = dev_get_drvdata(pdev->dev.parent);
	137
	138	btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
5052de8d	139	btqcomsmd_acl_callback, btq);
1511cc75 BA	140	if (IS_ERR(btq->acl_channel))
	141	return PTR_ERR(btq->acl_channel);
	142
	143	btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
5052de8d	144	btqcomsmd_cmd_callback, btq);
9a39a927 CJ	145	if (IS_ERR(btq->cmd_channel)) {
	146	ret = PTR_ERR(btq->cmd_channel);
	147	goto destroy_acl_channel;
	148	}
1511cc75	149
1511cc75	150	hdev = hci_alloc_dev();
9a39a927 CJ	151	if (!hdev) {
	152	ret = -ENOMEM;
	153	goto destroy_cmd_channel;
	154	}
1511cc75 BA	155
	156	hci_set_drvdata(hdev, btq);
	157	btq->hdev = hdev;
	158	SET_HCIDEV_DEV(hdev, &pdev->dev);
	159
	160	hdev->bus = HCI_SMD;
	161	hdev->open = btqcomsmd_open;
	162	hdev->close = btqcomsmd_close;
	163	hdev->send = btqcomsmd_send;
6e518111	164	hdev->setup = btqcomsmd_setup;
1511cc75 BA	165	hdev->set_bdaddr = qca_set_bdaddr_rome;
	166
	167	ret = hci_register_dev(hdev);
9a39a927 CJ	168	if (ret < 0)
9a39a927 CJ	169	goto hci_free_dev;
1511cc75 BA	170
	171	platform_set_drvdata(pdev, btq);
	172
	173	return 0;
9a39a927 CJ	174
	175	hci_free_dev:
	176	hci_free_dev(hdev);
	177	destroy_cmd_channel:
	178	rpmsg_destroy_ept(btq->cmd_channel);
	179	destroy_acl_channel:
	180	rpmsg_destroy_ept(btq->acl_channel);
	181
	182	return ret;
1511cc75 BA	183	}
	184
	185	static int btqcomsmd_remove(struct platform_device *pdev)
	186	{
	187	struct btqcomsmd *btq = platform_get_drvdata(pdev);
	188
	189	hci_unregister_dev(btq->hdev);
	190	hci_free_dev(btq->hdev);
	191
5052de8d BA	192	rpmsg_destroy_ept(btq->cmd_channel);
	193	rpmsg_destroy_ept(btq->acl_channel);
	194
1511cc75 BA	195	return 0;
	196	}
	197
	198	static const struct of_device_id btqcomsmd_of_match[] = {
	199	{ .compatible = "qcom,wcnss-bt", },
	200	{ },
	201	};
747d3f1a	202	MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
1511cc75 BA	203
	204	static struct platform_driver btqcomsmd_driver = {
	205	.probe = btqcomsmd_probe,
	206	.remove = btqcomsmd_remove,
	207	.driver = {
	208	.name = "btqcomsmd",
	209	.of_match_table = btqcomsmd_of_match,
	210	},
	211	};
	212
	213	module_platform_driver(btqcomsmd_driver);
	214
	215	MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
	216	MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
	217	MODULE_LICENSE("GPL v2");