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-rw-r--r--drivers/bluetooth/btsdio.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/drivers/bluetooth/btsdio.c b/drivers/bluetooth/btsdio.c
new file mode 100644
index 000000000..f19d31ee3
--- /dev/null
+++ b/drivers/bluetooth/btsdio.c
@@ -0,0 +1,382 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Generic Bluetooth SDIO driver
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio_ids.h>
+#include <linux/mmc/sdio_func.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#define VERSION "0.1"
+
+static const struct sdio_device_id btsdio_table[] = {
+ /* Generic Bluetooth Type-A SDIO device */
+ { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
+
+ /* Generic Bluetooth Type-B SDIO device */
+ { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
+
+ /* Generic Bluetooth AMP controller */
+ { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_AMP) },
+
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(sdio, btsdio_table);
+
+struct btsdio_data {
+ struct hci_dev *hdev;
+ struct sdio_func *func;
+
+ struct work_struct work;
+
+ struct sk_buff_head txq;
+};
+
+#define REG_RDAT 0x00 /* Receiver Data */
+#define REG_TDAT 0x00 /* Transmitter Data */
+#define REG_PC_RRT 0x10 /* Read Packet Control */
+#define REG_PC_WRT 0x11 /* Write Packet Control */
+#define REG_RTC_STAT 0x12 /* Retry Control Status */
+#define REG_RTC_SET 0x12 /* Retry Control Set */
+#define REG_INTRD 0x13 /* Interrupt Indication */
+#define REG_CL_INTRD 0x13 /* Interrupt Clear */
+#define REG_EN_INTRD 0x14 /* Interrupt Enable */
+#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
+#define REG_MD_SET 0x20 /* Bluetooth Mode Set */
+
+static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
+{
+ int err;
+
+ BT_DBG("%s", data->hdev->name);
+
+ /* Prepend Type-A header */
+ skb_push(skb, 4);
+ skb->data[0] = (skb->len & 0x0000ff);
+ skb->data[1] = (skb->len & 0x00ff00) >> 8;
+ skb->data[2] = (skb->len & 0xff0000) >> 16;
+ skb->data[3] = hci_skb_pkt_type(skb);
+
+ err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
+ if (err < 0) {
+ skb_pull(skb, 4);
+ sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
+ return err;
+ }
+
+ data->hdev->stat.byte_tx += skb->len;
+
+ kfree_skb(skb);
+
+ return 0;
+}
+
+static void btsdio_work(struct work_struct *work)
+{
+ struct btsdio_data *data = container_of(work, struct btsdio_data, work);
+ struct sk_buff *skb;
+ int err;
+
+ BT_DBG("%s", data->hdev->name);
+
+ sdio_claim_host(data->func);
+
+ while ((skb = skb_dequeue(&data->txq))) {
+ err = btsdio_tx_packet(data, skb);
+ if (err < 0) {
+ data->hdev->stat.err_tx++;
+ skb_queue_head(&data->txq, skb);
+ break;
+ }
+ }
+
+ sdio_release_host(data->func);
+}
+
+static int btsdio_rx_packet(struct btsdio_data *data)
+{
+ u8 hdr[4] __attribute__ ((aligned(4)));
+ struct sk_buff *skb;
+ int err, len;
+
+ BT_DBG("%s", data->hdev->name);
+
+ err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
+ if (err < 0)
+ return err;
+
+ len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
+ if (len < 4 || len > 65543)
+ return -EILSEQ;
+
+ skb = bt_skb_alloc(len - 4, GFP_KERNEL);
+ if (!skb) {
+ /* Out of memory. Prepare a read retry and just
+ * return with the expectation that the next time
+ * we're called we'll have more memory.
+ */
+ return -ENOMEM;
+ }
+
+ skb_put(skb, len - 4);
+
+ err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ data->hdev->stat.byte_rx += len;
+
+ switch (hdr[3]) {
+ case HCI_EVENT_PKT:
+ case HCI_ACLDATA_PKT:
+ case HCI_SCODATA_PKT:
+ case HCI_ISODATA_PKT:
+ hci_skb_pkt_type(skb) = hdr[3];
+ err = hci_recv_frame(data->hdev, skb);
+ if (err < 0)
+ return err;
+ break;
+ default:
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
+
+ return 0;
+}
+
+static void btsdio_interrupt(struct sdio_func *func)
+{
+ struct btsdio_data *data = sdio_get_drvdata(func);
+ int intrd;
+
+ BT_DBG("%s", data->hdev->name);
+
+ intrd = sdio_readb(func, REG_INTRD, NULL);
+ if (intrd & 0x01) {
+ sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
+
+ if (btsdio_rx_packet(data) < 0) {
+ data->hdev->stat.err_rx++;
+ sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
+ }
+ }
+}
+
+static int btsdio_open(struct hci_dev *hdev)
+{
+ struct btsdio_data *data = hci_get_drvdata(hdev);
+ int err;
+
+ BT_DBG("%s", hdev->name);
+
+ sdio_claim_host(data->func);
+
+ err = sdio_enable_func(data->func);
+ if (err < 0)
+ goto release;
+
+ err = sdio_claim_irq(data->func, btsdio_interrupt);
+ if (err < 0) {
+ sdio_disable_func(data->func);
+ goto release;
+ }
+
+ if (data->func->class == SDIO_CLASS_BT_B)
+ sdio_writeb(data->func, 0x00, REG_MD_SET, NULL);
+
+ sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
+
+release:
+ sdio_release_host(data->func);
+
+ return err;
+}
+
+static int btsdio_close(struct hci_dev *hdev)
+{
+ struct btsdio_data *data = hci_get_drvdata(hdev);
+
+ BT_DBG("%s", hdev->name);
+
+ sdio_claim_host(data->func);
+
+ sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
+
+ sdio_release_irq(data->func);
+ sdio_disable_func(data->func);
+
+ sdio_release_host(data->func);
+
+ return 0;
+}
+
+static int btsdio_flush(struct hci_dev *hdev)
+{
+ struct btsdio_data *data = hci_get_drvdata(hdev);
+
+ BT_DBG("%s", hdev->name);
+
+ skb_queue_purge(&data->txq);
+
+ return 0;
+}
+
+static int btsdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct btsdio_data *data = hci_get_drvdata(hdev);
+
+ BT_DBG("%s", hdev->name);
+
+ switch (hci_skb_pkt_type(skb)) {
+ case HCI_COMMAND_PKT:
+ hdev->stat.cmd_tx++;
+ break;
+
+ case HCI_ACLDATA_PKT:
+ hdev->stat.acl_tx++;
+ break;
+
+ case HCI_SCODATA_PKT:
+ hdev->stat.sco_tx++;
+ break;
+
+ default:
+ return -EILSEQ;
+ }
+
+ skb_queue_tail(&data->txq, skb);
+
+ schedule_work(&data->work);
+
+ return 0;
+}
+
+static int btsdio_probe(struct sdio_func *func,
+ const struct sdio_device_id *id)
+{
+ struct btsdio_data *data;
+ struct hci_dev *hdev;
+ struct sdio_func_tuple *tuple = func->tuples;
+ int err;
+
+ BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
+
+ while (tuple) {
+ BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
+ tuple = tuple->next;
+ }
+
+ /* Broadcom devices soldered onto the PCB (non-removable) use an
+ * UART connection for Bluetooth, ignore the BT SDIO interface.
+ */
+ if (func->vendor == SDIO_VENDOR_ID_BROADCOM &&
+ !mmc_card_is_removable(func->card->host)) {
+ switch (func->device) {
+ case SDIO_DEVICE_ID_BROADCOM_43341:
+ case SDIO_DEVICE_ID_BROADCOM_43430:
+ case SDIO_DEVICE_ID_BROADCOM_4345:
+ case SDIO_DEVICE_ID_BROADCOM_43455:
+ case SDIO_DEVICE_ID_BROADCOM_4356:
+ return -ENODEV;
+ }
+ }
+
+ data = devm_kzalloc(&func->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->func = func;
+
+ INIT_WORK(&data->work, btsdio_work);
+
+ skb_queue_head_init(&data->txq);
+
+ hdev = hci_alloc_dev();
+ if (!hdev)
+ return -ENOMEM;
+
+ hdev->bus = HCI_SDIO;
+ hci_set_drvdata(hdev, data);
+
+ if (id->class == SDIO_CLASS_BT_AMP)
+ hdev->dev_type = HCI_AMP;
+ else
+ hdev->dev_type = HCI_PRIMARY;
+
+ data->hdev = hdev;
+
+ SET_HCIDEV_DEV(hdev, &func->dev);
+
+ hdev->open = btsdio_open;
+ hdev->close = btsdio_close;
+ hdev->flush = btsdio_flush;
+ hdev->send = btsdio_send_frame;
+
+ if (func->vendor == 0x0104 && func->device == 0x00c5)
+ set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
+
+ err = hci_register_dev(hdev);
+ if (err < 0) {
+ hci_free_dev(hdev);
+ return err;
+ }
+
+ sdio_set_drvdata(func, data);
+
+ return 0;
+}
+
+static void btsdio_remove(struct sdio_func *func)
+{
+ struct btsdio_data *data = sdio_get_drvdata(func);
+ struct hci_dev *hdev;
+
+ BT_DBG("func %p", func);
+
+ if (!data)
+ return;
+
+ cancel_work_sync(&data->work);
+ hdev = data->hdev;
+
+ sdio_set_drvdata(func, NULL);
+
+ hci_unregister_dev(hdev);
+
+ hci_free_dev(hdev);
+}
+
+static struct sdio_driver btsdio_driver = {
+ .name = "btsdio",
+ .probe = btsdio_probe,
+ .remove = btsdio_remove,
+ .id_table = btsdio_table,
+};
+
+module_sdio_driver(btsdio_driver);
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");