[people/arne_f/kernel.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/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);

	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>
1511cc75 BA	18	#include <linux/soc/qcom/wcnss_ctrl.h>
	19	#include <linux/platform_device.h>
	20
	21	#include <net/bluetooth/bluetooth.h>
	22	#include <net/bluetooth/hci_core.h>
	23
	24	#include "btqca.h"
	25
	26	struct btqcomsmd {
	27	struct hci_dev *hdev;
	28
5912d9ca	29	bdaddr_t bdaddr;
5052de8d BA	30	struct rpmsg_endpoint *acl_channel;
5052de8d BA	31	struct rpmsg_endpoint *cmd_channel;
1511cc75 BA	32	};
	33
	34	static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
	35	const void *data, size_t count)
	36	{
	37	struct sk_buff *skb;
	38
	39	/* Use GFP_ATOMIC as we're in IRQ context */
	40	skb = bt_skb_alloc(count, GFP_ATOMIC);
	41	if (!skb) {
	42	hdev->stat.err_rx++;
	43	return -ENOMEM;
	44	}
	45
	46	hci_skb_pkt_type(skb) = type;
59ae1d12	47	skb_put_data(skb, data, count);
1511cc75 BA	48
	49	return hci_recv_frame(hdev, skb);
	50	}
	51
5052de8d BA	52	static int btqcomsmd_acl_callback(struct rpmsg_device rpdev, void data,
5052de8d BA	53	int count, void *priv, u32 addr)
1511cc75	54	{
5052de8d	55	struct btqcomsmd *btq = priv;
1511cc75 BA	56
	57	btq->hdev->stat.byte_rx += count;
	58	return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
	59	}
	60
5052de8d BA	61	static int btqcomsmd_cmd_callback(struct rpmsg_device rpdev, void data,
5052de8d BA	62	int count, void *priv, u32 addr)
1511cc75	63	{
5052de8d	64	struct btqcomsmd *btq = priv;
1511cc75 BA	65
	66	return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
	67	}
	68
	69	static int btqcomsmd_send(struct hci_dev hdev, struct sk_buff skb)
	70	{
	71	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	72	int ret;
	73
	74	switch (hci_skb_pkt_type(skb)) {
	75	case HCI_ACLDATA_PKT:
5052de8d	76	ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
1511cc75 BA	77	hdev->stat.acl_tx++;
	78	hdev->stat.byte_tx += skb->len;
	79	break;
	80	case HCI_COMMAND_PKT:
5052de8d	81	ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
1511cc75 BA	82	hdev->stat.cmd_tx++;
	83	break;
	84	default:
	85	ret = -EILSEQ;
	86	break;
	87	}
	88
e59e19dc LP	89	if (!ret)
e59e19dc LP	90	kfree_skb(skb);
1511cc75 BA	91
	92	return ret;
	93	}
	94
	95	static int btqcomsmd_open(struct hci_dev *hdev)
	96	{
	97	return 0;
	98	}
	99
	100	static int btqcomsmd_close(struct hci_dev *hdev)
	101	{
	102	return 0;
	103	}
	104
5912d9ca LP	105	static int btqcomsmd_setup(struct hci_dev *hdev)
	106	{
	107	struct btqcomsmd *btq = hci_get_drvdata(hdev);
	108	struct sk_buff *skb;
	109	int err;
	110
	111	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
	112	if (IS_ERR(skb))
	113	return PTR_ERR(skb);
	114	kfree_skb(skb);
	115
	116	/* Devices do not have persistent storage for BD address. If no
	117	* BD address has been retrieved during probe, mark the device
	118	* as having an invalid BD address.
	119	*/
	120	if (!bacmp(&btq->bdaddr, BDADDR_ANY)) {
	121	set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
	122	return 0;
	123	}
	124
	125	/* When setting a configured BD address fails, mark the device
	126	* as having an invalid BD address.
	127	*/
	128	err = qca_set_bdaddr_rome(hdev, &btq->bdaddr);
	129	if (err) {
	130	set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
	131	return 0;
	132	}
	133
	134	return 0;
	135	}
	136
1511cc75 BA	137	static int btqcomsmd_probe(struct platform_device *pdev)
	138	{
	139	struct btqcomsmd *btq;
	140	struct hci_dev *hdev;
	141	void *wcnss;
	142	int ret;
	143
	144	btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
	145	if (!btq)
	146	return -ENOMEM;
	147
	148	wcnss = dev_get_drvdata(pdev->dev.parent);
	149
	150	btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
5052de8d	151	btqcomsmd_acl_callback, btq);
1511cc75 BA	152	if (IS_ERR(btq->acl_channel))
	153	return PTR_ERR(btq->acl_channel);
	154
	155	btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
5052de8d	156	btqcomsmd_cmd_callback, btq);
1511cc75 BA	157	if (IS_ERR(btq->cmd_channel))
	158	return PTR_ERR(btq->cmd_channel);
	159
1511cc75 BA	160	hdev = hci_alloc_dev();
	161	if (!hdev)
	162	return -ENOMEM;
	163
	164	hci_set_drvdata(hdev, btq);
	165	btq->hdev = hdev;
	166	SET_HCIDEV_DEV(hdev, &pdev->dev);
	167
	168	hdev->bus = HCI_SMD;
	169	hdev->open = btqcomsmd_open;
	170	hdev->close = btqcomsmd_close;
	171	hdev->send = btqcomsmd_send;
5912d9ca	172	hdev->setup = btqcomsmd_setup;
1511cc75 BA	173	hdev->set_bdaddr = qca_set_bdaddr_rome;
	174
	175	ret = hci_register_dev(hdev);
	176	if (ret < 0) {
	177	hci_free_dev(hdev);
	178	return ret;
	179	}
	180
	181	platform_set_drvdata(pdev, btq);
	182
	183	return 0;
	184	}
	185
	186	static int btqcomsmd_remove(struct platform_device *pdev)
	187	{
	188	struct btqcomsmd *btq = platform_get_drvdata(pdev);
	189
	190	hci_unregister_dev(btq->hdev);
	191	hci_free_dev(btq->hdev);
	192
5052de8d BA	193	rpmsg_destroy_ept(btq->cmd_channel);
	194	rpmsg_destroy_ept(btq->acl_channel);
	195
1511cc75 BA	196	return 0;
	197	}
	198
	199	static const struct of_device_id btqcomsmd_of_match[] = {
	200	{ .compatible = "qcom,wcnss-bt", },
	201	{ },
	202	};
747d3f1a	203	MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
1511cc75 BA	204
	205	static struct platform_driver btqcomsmd_driver = {
	206	.probe = btqcomsmd_probe,
	207	.remove = btqcomsmd_remove,
	208	.driver = {
	209	.name = "btqcomsmd",
	210	.of_match_table = btqcomsmd_of_match,
	211	},
	212	};
	213
	214	module_platform_driver(btqcomsmd_driver);
	215
	216	MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
	217	MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
	218	MODULE_LICENSE("GPL v2");