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path: root/drivers/bluetooth/btqcomsmd.c
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Diffstat (limited to 'drivers/bluetooth/btqcomsmd.c')
-rw-r--r--drivers/bluetooth/btqcomsmd.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c
new file mode 100644
index 0000000000..11c7e04bf3
--- /dev/null
+++ b/drivers/bluetooth/btqcomsmd.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016, Linaro Ltd.
+ * Copyright (c) 2015, Sony Mobile Communications Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/rpmsg.h>
+#include <linux/of.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 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;
+
+ btq->hdev->stat.byte_rx += count;
+ 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);
+ if (ret) {
+ hdev->stat.err_tx++;
+ break;
+ }
+ 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);
+ if (ret) {
+ hdev->stat.err_tx++;
+ break;
+ }
+ hdev->stat.cmd_tx++;
+ hdev->stat.byte_tx += skb->len;
+ 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 sk_buff *skb;
+
+ 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. Retrieve
+ * it from the firmware node property.
+ */
+ set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
+
+ return 0;
+}
+
+static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+ int ret;
+
+ ret = qca_set_bdaddr_rome(hdev, bdaddr);
+ if (ret)
+ return ret;
+
+ /* The firmware stops responding for a while after setting the bdaddr,
+ * causing timeouts for subsequent commands. Sleep a bit to avoid this.
+ */
+ usleep_range(1000, 10000);
+ 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)) {
+ ret = PTR_ERR(btq->cmd_channel);
+ goto destroy_acl_channel;
+ }
+
+ hdev = hci_alloc_dev();
+ if (!hdev) {
+ ret = -ENOMEM;
+ goto destroy_cmd_channel;
+ }
+
+ 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 = btqcomsmd_set_bdaddr;
+
+ ret = hci_register_dev(hdev);
+ if (ret < 0)
+ goto hci_free_dev;
+
+ platform_set_drvdata(pdev, btq);
+
+ return 0;
+
+hci_free_dev:
+ hci_free_dev(hdev);
+destroy_cmd_channel:
+ rpmsg_destroy_ept(btq->cmd_channel);
+destroy_acl_channel:
+ rpmsg_destroy_ept(btq->acl_channel);
+
+ return ret;
+}
+
+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");