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

/*
 * Copyright (c) 2016, Linaro Ltd.
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#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;

	bdaddr_t bdaddr;
	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;

	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);
		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);
		hdev->stat.cmd_tx++;
		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 btqcomsmd *btq = hci_get_drvdata(hdev);
	struct sk_buff *skb;
	int err;

	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. If no
	 * BD address has been retrieved during probe, mark the device
	 * as having an invalid BD address.
	 */
	if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
		return 0;
	}

	/* When setting a configured BD address fails, mark the device
	 * as having an invalid BD address.
	 */
	err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
	if (err) {
		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
		return 0;
	}

	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))
		return PTR_ERR(btq->cmd_channel);

	/* The local-bd-address property is usually injected by the
	 * bootloader which has access to the allocated BD address.
	 */
	if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
				       (u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
		dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
			 &btq->bdaddr);
	}

	hdev = hci_alloc_dev();
	if (!hdev)
		return -ENOMEM;

	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) {
		hci_free_dev(hdev);
		return ret;
	}

	platform_set_drvdata(pdev, btq);

	return 0;
}

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
1511cc75 BA	1	/*
	2	* Copyright (c) 2016, Linaro Ltd.
	3	* Copyright (c) 2015, Sony Mobile Communications Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 and
	7	* only version 2 as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
5052de8d	17	#include <linux/rpmsg.h>
766154b7 LP	18	#include <linux/of.h>
766154b7 LP	19
1511cc75 BA	20	#include <linux/soc/qcom/wcnss_ctrl.h>
	21	#include <linux/platform_device.h>
	22
	23	#include <net/bluetooth/bluetooth.h>
	24	#include <net/bluetooth/hci_core.h>
	25
	26	#include "btqca.h"
	27
	28	struct btqcomsmd {
	29	struct hci_dev *hdev;
	30
6e518111	31	bdaddr_t bdaddr;
5052de8d BA	32	struct rpmsg_endpoint *acl_channel;
5052de8d BA	33	struct rpmsg_endpoint *cmd_channel;
1511cc75 BA	34	};
	35
	36	static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
	37	const void *data, size_t count)
	38	{
	39	struct sk_buff *skb;
	40
	41	/* Use GFP_ATOMIC as we're in IRQ context */
	42	skb = bt_skb_alloc(count, GFP_ATOMIC);
	43	if (!skb) {
	44	hdev->stat.err_rx++;
	45	return -ENOMEM;
	46	}
	47
	48	hci_skb_pkt_type(skb) = type;
59ae1d12	49	skb_put_data(skb, data, count);
1511cc75 BA	50
	51	return hci_recv_frame(hdev, skb);
	52	}
	53
5052de8d BA	54	static int btqcomsmd_acl_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 BA	58
	59	btq->hdev->stat.byte_rx += count;
	60	return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
	61	}
	62
5052de8d BA	63	static int btqcomsmd_cmd_callback(struct rpmsg_device rpdev, void data,
5052de8d BA	64	int count, void *priv, u32 addr)
1511cc75	65	{
5052de8d	66	struct btqcomsmd *btq = priv;
1511cc75 BA	67
	68	return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
	69	}
	70
	71	static int btqcomsmd_send(struct hci_dev hdev, struct sk_buff skb)
	72	{
	73	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	74	int ret;
	75
	76	switch (hci_skb_pkt_type(skb)) {
	77	case HCI_ACLDATA_PKT:
5052de8d	78	ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
1511cc75 BA	79	hdev->stat.acl_tx++;
	80	hdev->stat.byte_tx += skb->len;
	81	break;
	82	case HCI_COMMAND_PKT:
5052de8d	83	ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
1511cc75 BA	84	hdev->stat.cmd_tx++;
	85	break;
	86	default:
	87	ret = -EILSEQ;
	88	break;
	89	}
	90
67b8fbea LP	91	if (!ret)
67b8fbea LP	92	kfree_skb(skb);
1511cc75 BA	93
	94	return ret;
	95	}
	96
	97	static int btqcomsmd_open(struct hci_dev *hdev)
	98	{
	99	return 0;
	100	}
	101
	102	static int btqcomsmd_close(struct hci_dev *hdev)
	103	{
	104	return 0;
	105	}
	106
6e518111 LP	107	static int btqcomsmd_setup(struct hci_dev *hdev)
	108	{
	109	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	110	struct sk_buff *skb;
	111	int err;
	112
	113	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
	114	if (IS_ERR(skb))
	115	return PTR_ERR(skb);
	116	kfree_skb(skb);
	117
	118	/* Devices do not have persistent storage for BD address. If no
	119	* BD address has been retrieved during probe, mark the device
	120	* as having an invalid BD address.
	121	*/
	122	if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
	123	set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
	124	return 0;
	125	}
	126
	127	/* When setting a configured BD address fails, mark the device
	128	* as having an invalid BD address.
	129	*/
	130	err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
	131	if (err) {
	132	set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
	133	return 0;
	134	}
	135
	136	return 0;
	137	}
	138
1511cc75 BA	139	static int btqcomsmd_probe(struct platform_device *pdev)
	140	{
	141	struct btqcomsmd *btq;
	142	struct hci_dev *hdev;
	143	void *wcnss;
	144	int ret;
	145
	146	btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
	147	if (!btq)
	148	return -ENOMEM;
	149
	150	wcnss = dev_get_drvdata(pdev->dev.parent);
	151
	152	btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
5052de8d	153	btqcomsmd_acl_callback, btq);
1511cc75 BA	154	if (IS_ERR(btq->acl_channel))
	155	return PTR_ERR(btq->acl_channel);
	156
	157	btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
5052de8d	158	btqcomsmd_cmd_callback, btq);
1511cc75 BA	159	if (IS_ERR(btq->cmd_channel))
	160	return PTR_ERR(btq->cmd_channel);
	161
766154b7 LP	162	/* The local-bd-address property is usually injected by the
	163	* bootloader which has access to the allocated BD address.
	164	*/
	165	if (!of_property_read_u8_array(pdev->dev.of_node, "local-bd-address",
	166	(u8 *)&btq->bdaddr, sizeof(bdaddr_t))) {
	167	dev_info(&pdev->dev, "BD address %pMR retrieved from device-tree",
	168	&btq->bdaddr);
	169	}
	170
1511cc75 BA	171	hdev = hci_alloc_dev();
	172	if (!hdev)
	173	return -ENOMEM;
	174
	175	hci_set_drvdata(hdev, btq);
	176	btq->hdev = hdev;
	177	SET_HCIDEV_DEV(hdev, &pdev->dev);
	178
	179	hdev->bus = HCI_SMD;
	180	hdev->open = btqcomsmd_open;
	181	hdev->close = btqcomsmd_close;
	182	hdev->send = btqcomsmd_send;
6e518111	183	hdev->setup = btqcomsmd_setup;
1511cc75 BA	184	hdev->set_bdaddr = qca_set_bdaddr_rome;
	185
	186	ret = hci_register_dev(hdev);
	187	if (ret < 0) {
	188	hci_free_dev(hdev);
	189	return ret;
	190	}
	191
	192	platform_set_drvdata(pdev, btq);
	193
	194	return 0;
	195	}
	196
	197	static int btqcomsmd_remove(struct platform_device *pdev)
	198	{
	199	struct btqcomsmd *btq = platform_get_drvdata(pdev);
	200
	201	hci_unregister_dev(btq->hdev);
	202	hci_free_dev(btq->hdev);
	203
5052de8d BA	204	rpmsg_destroy_ept(btq->cmd_channel);
	205	rpmsg_destroy_ept(btq->acl_channel);
	206
1511cc75 BA	207	return 0;
	208	}
	209
	210	static const struct of_device_id btqcomsmd_of_match[] = {
	211	{ .compatible = "qcom,wcnss-bt", },
	212	{ },
	213	};
747d3f1a	214	MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
1511cc75 BA	215
	216	static struct platform_driver btqcomsmd_driver = {
	217	.probe = btqcomsmd_probe,
	218	.remove = btqcomsmd_remove,
	219	.driver = {
	220	.name = "btqcomsmd",
	221	.of_match_table = btqcomsmd_of_match,
	222	},
	223	};
	224
	225	module_platform_driver(btqcomsmd_driver);
	226
	227	MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
	228	MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
	229	MODULE_LICENSE("GPL v2");