[PATCH v2 7/7] Bluetooth: btqcomsmd: Qualcomm WCNSS HCI driver

[Bjorn Andersson]

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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