The Qualcomm WCNSS chip provides two SMD channels to the BT core; one
for command and one for event packets. This driver exposes the two
channels as a hci device.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
---
Changes since v1:
- With the introduction of qcom_smd_open_channel() the two drivers are now one
- No more global state
- Corrected memory management of sk_buffs
- Reverted to __hci_cmd_sync_ev() for set_bdaddr
- Renamed the driver to btqcomsmd
- Split out the addition of HCI_SMD to separate patch
drivers/bluetooth/Kconfig | 11 +++
drivers/bluetooth/Makefile | 1 +
drivers/bluetooth/btqcomsmd.c | 198 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 210 insertions(+)
create mode 100644 drivers/bluetooth/btqcomsmd.c
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 62999546a301..1652997e59cc 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -169,6 +169,17 @@ config BT_HCIUART_QCA
Say Y here to compile support for QCA protocol.
+config BT_QCOMSMD
+ tristate "Qualcomm SMD based HCI support"
+ depends on QCOM_SMD
+ help
+ Qualcomm SMD based HCI driver.
+ This driver is used to bridge HCI data onto the shared memory
+ channels to the WCNSS core.
+
+ Say Y here to compile support for HCI over Qualcomm SMD into the
+ kernelor say M to compile as a module.
+
config BT_HCIBCM203X
tristate "HCI BCM203x USB driver"
depends on USB
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 07c9cf381e5a..19e313bf8c39 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_BT_WILINK) += btwilink.o
obj-$(CONFIG_BT_BCM) += btbcm.o
obj-$(CONFIG_BT_RTL) += btrtl.o
obj-$(CONFIG_BT_QCA) += btqca.o
+obj-$(CONFIG_BT_QCOMSMD) += btqcomsmd.o
btmrvl-y := btmrvl_main.o
btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o
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");
--
2.4.2
--
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