// 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) }, 	{ }	/* 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:		case SDIO_DEVICE_ID_BROADCOM_CYPRESS_4373:			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); 	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)		hci_set_quirk(hdev, HCI_QUIRK_RESET_ON_CLOSE); 	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");