Bluetooth: Introduce Qualcomm WCNSS SMD based HCI driver

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@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index cf50fd2..2c48191 100644 (file)
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -331,4 +331,16 @@ config BT_WILINK
          Say Y here to compile support for Texas Instrument's WiLink7 driver
          into the kernel or say M to compile it as module (btwilink).
 
+config BT_QCOMSMD
+       tristate "Qualcomm SMD based HCI support"
+       depends on QCOM_SMD
+       select BT_QCA
+       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
+         kernel or say M to compile as a module.
+
 endmenu

diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 9c18939..3e92cfe 100644 (file)
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_BT_ATH3K)                += ath3k.o
 obj-$(CONFIG_BT_MRVL)          += btmrvl.o
 obj-$(CONFIG_BT_MRVL_SDIO)     += btmrvl_sdio.o
 obj-$(CONFIG_BT_WILINK)                += btwilink.o
+obj-$(CONFIG_BT_QCOMSMD)       += btqcomsmd.o
 obj-$(CONFIG_BT_BCM)           += btbcm.o
 obj-$(CONFIG_BT_RTL)           += btrtl.o
 obj-$(CONFIG_BT_QCA)           += btqca.o

diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c
new file mode 100644 (file)
index 0000000..08c2c93
--- /dev/null
+++ b/drivers/bluetooth/btqcomsmd.c
@@ -0,0 +1,182 @@
+/*
+ * 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/soc/qcom/smd.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;
+
+       struct qcom_smd_channel *acl_channel;
+       struct qcom_smd_channel *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;
+       memcpy(skb_put(skb, count), data, count);
+
+       return hci_recv_frame(hdev, skb);
+}
+
+static int btqcomsmd_acl_callback(struct qcom_smd_channel *channel,
+                                 const void *data, size_t count)
+{
+       struct btqcomsmd *btq = qcom_smd_get_drvdata(channel);
+
+       btq->hdev->stat.byte_rx += count;
+       return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
+}
+
+static int btqcomsmd_cmd_callback(struct qcom_smd_channel *channel,
+                                 const void *data, size_t count)
+{
+       struct btqcomsmd *btq = qcom_smd_get_drvdata(channel);
+
+       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 = qcom_smd_send(btq->acl_channel, skb->data, skb->len);
+               hdev->stat.acl_tx++;
+               hdev->stat.byte_tx += skb->len;
+               break;
+       case HCI_COMMAND_PKT:
+               ret = qcom_smd_send(btq->cmd_channel, skb->data, skb->len);
+               hdev->stat.cmd_tx++;
+               break;
+       default:
+               ret = -EILSEQ;
+               break;
+       }
+
+       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_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);
+       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);
+       if (IS_ERR(btq->cmd_channel))
+               return PTR_ERR(btq->cmd_channel);
+
+       qcom_smd_set_drvdata(btq->acl_channel, btq);
+       qcom_smd_set_drvdata(btq->cmd_channel, btq);
+
+       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->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);
+
+       return 0;
+}
+
+static const struct of_device_id btqcomsmd_of_match[] = {
+       { .compatible = "qcom,wcnss-bt", },
+       { },
+};
+
+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");