diff options
Diffstat (limited to 'drivers/bluetooth/btqcomsmd.c')
| -rw-r--r-- | drivers/bluetooth/btqcomsmd.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c new file mode 100644 index 000000000000..4b91c830531e --- /dev/null +++ b/drivers/bluetooth/btqcomsmd.c @@ -0,0 +1,198 @@ +/* + * 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/soc/qcom/smd.h> +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/hci.h> + +#define EDL_NVM_ACCESS_SET_REQ_CMD 0x01 +#define EDL_NVM_ACCESS_OPCODE 0xfc0b + +struct btqcomsmd { + struct qcom_smd_channel *acl_channel; + struct qcom_smd_channel *cmd_channel; +}; + +static int btqcomsmd_recv(struct hci_dev *hdev, + unsigned type, + const void *data, + size_t count) +{ + struct sk_buff *skb; + void *buf; + + /* Use GFP_ATOMIC as we're in IRQ context */ + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return -ENOMEM; + + bt_cb(skb)->pkt_type = type; + + /* Use io accessor as data might be ioremapped */ + buf = skb_put(skb, count); + memcpy_fromio(buf, data, count); + + return hci_recv_frame(hdev, skb); +} + +static int btqcomsmd_acl_callback(struct qcom_smd_device *qsdev, + const void *data, + size_t count) +{ + struct hci_dev *hdev = dev_get_drvdata(&qsdev->dev); + + return btqcomsmd_recv(hdev, HCI_ACLDATA_PKT, data, count); +} + +static int btqcomsmd_cmd_callback(struct qcom_smd_device *qsdev, + const void *data, + size_t count) +{ + struct hci_dev *hdev = dev_get_drvdata(&qsdev->dev); + + return btqcomsmd_recv(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 (bt_cb(skb)->pkt_type) { + case HCI_ACLDATA_PKT: + case HCI_SCODATA_PKT: + ret = qcom_smd_send(btq->acl_channel, skb->data, skb->len); + break; + case HCI_COMMAND_PKT: + ret = qcom_smd_send(btq->cmd_channel, skb->data, skb->len); + break; + default: + ret = -ENODEV; + break; + } + + return ret; +} + +static int btqcomsmd_open(struct hci_dev *hdev) +{ + set_bit(HCI_RUNNING, &hdev->flags); + return 0; +} + +static int btqcomsmd_close(struct hci_dev *hdev) +{ + clear_bit(HCI_RUNNING, &hdev->flags); + return 0; +} + +static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, + const bdaddr_t *bdaddr) +{ + struct sk_buff *skb; + u8 cmd[9]; + int err; + + cmd[0] = EDL_NVM_ACCESS_SET_REQ_CMD; + cmd[1] = 0x02; /* TAG ID */ + cmd[2] = sizeof(bdaddr_t); /* size */ + memcpy(cmd + 3, bdaddr, sizeof(bdaddr_t)); + skb = __hci_cmd_sync_ev(hdev, + EDL_NVM_ACCESS_OPCODE, + sizeof(cmd), cmd, + HCI_VENDOR_PKT, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + BT_ERR("%s: Change address command failed (%d)", + hdev->name, err); + return err; + } + + kfree_skb(skb); + + return 0; +} + +static int btqcomsmd_probe(struct qcom_smd_device *sdev) +{ + struct qcom_smd_channel *acl; + struct btqcomsmd *btq; + struct hci_dev *hdev; + int ret; + + acl = qcom_smd_open_channel(sdev, + "APPS_RIVA_BT_ACL", + btqcomsmd_acl_callback); + if (IS_ERR(acl)) + return PTR_ERR(acl); + + btq = devm_kzalloc(&sdev->dev, sizeof(*btq), GFP_KERNEL); + if (!btq) + return -ENOMEM; + + btq->acl_channel = acl; + btq->cmd_channel = sdev->channel; + + hdev = hci_alloc_dev(); + if (!hdev) + return -ENOMEM; + + hdev->bus = HCI_SMD; + hdev->open = btqcomsmd_open; + hdev->close = btqcomsmd_close; + hdev->send = btqcomsmd_send; + hdev->set_bdaddr = btqcomsmd_set_bdaddr; + + ret = hci_register_dev(hdev); + if (ret < 0) { + hci_free_dev(hdev); + return ret; + } + + hci_set_drvdata(hdev, btq); + dev_set_drvdata(&sdev->dev, hdev); + + return 0; +} + +static void btqcomsmd_remove(struct qcom_smd_device *sdev) +{ + struct hci_dev *hdev = dev_get_drvdata(&sdev->dev);; + + hci_unregister_dev(hdev); + hci_free_dev(hdev); +} + +static const struct qcom_smd_id btqcomsmd_match[] = { + { .name = "APPS_RIVA_BT_CMD" }, + {} +}; + +static struct qcom_smd_driver btqcomsmd_cmd_driver = { + .probe = btqcomsmd_probe, + .remove = btqcomsmd_remove, + .callback = btqcomsmd_cmd_callback, + .smd_match_table = btqcomsmd_match, + .driver = { + .name = "btqcomsmd", + .owner = THIS_MODULE, + }, +}; + +module_qcom_smd_driver(btqcomsmd_cmd_driver); + +MODULE_DESCRIPTION("Qualcomm SMD HCI driver"); +MODULE_LICENSE("GPL v2"); |