diff options
Diffstat (limited to 'drivers/bluetooth/btsdio.c')
| -rw-r--r-- | drivers/bluetooth/btsdio.c | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/drivers/bluetooth/btsdio.c b/drivers/bluetooth/btsdio.c new file mode 100644 index 000000000..2e4ac39dd --- /dev/null +++ b/drivers/bluetooth/btsdio.c @@ -0,0 +1,380 @@ +// 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_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"); |