/* * * Generic Bluetooth SDIO driver * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. * Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org> * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #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/sdio_ids.h> #include <linux/mmc/sdio_func.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #ifndef CONFIG_BT_HCIBTSDIO_DEBUG #undef BT_DBG #define BT_DBG(D...) #endif #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 */ 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] = bt_cb(skb)->pkt_type; err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len); if (err < 0) { 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); return err; } data->hdev->stat.byte_rx += len; skb->dev = (void *) data->hdev; bt_cb(skb)->pkt_type = hdr[3]; err = hci_recv_frame(skb); if (err < 0) return err; 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 = hdev->driver_data; int err; BT_DBG("%s", hdev->name); if (test_and_set_bit(HCI_RUNNING, &hdev->flags)) return 0; sdio_claim_host(data->func); err = sdio_enable_func(data->func); if (err < 0) { clear_bit(HCI_RUNNING, &hdev->flags); goto release; } err = sdio_claim_irq(data->func, btsdio_interrupt); if (err < 0) { sdio_disable_func(data->func); clear_bit(HCI_RUNNING, &hdev->flags); goto release; } if (data->func->class == SDIO_CLASS_BT_B) sdio_writeb(data->func, 0x00, REG_MD_STAT, 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 = hdev->driver_data; BT_DBG("%s", hdev->name); if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) return 0; 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 = hdev->driver_data; BT_DBG("%s", hdev->name); skb_queue_purge(&data->txq); return 0; } static int btsdio_send_frame(struct sk_buff *skb) { struct hci_dev *hdev = (struct hci_dev *) skb->dev; struct btsdio_data *data = hdev->driver_data; BT_DBG("%s", hdev->name); if (!test_bit(HCI_RUNNING, &hdev->flags)) return -EBUSY; switch (bt_cb(skb)->pkt_type) { 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 void btsdio_destruct(struct hci_dev *hdev) { struct btsdio_data *data = hdev->driver_data; BT_DBG("%s", hdev->name); kfree(data); } 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; } data = kzalloc(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) { kfree(data); return -ENOMEM; } hdev->type = HCI_SDIO; hdev->driver_data = 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; hdev->destruct = btsdio_destruct; hdev->owner = THIS_MODULE; err = hci_register_dev(hdev); if (err < 0) { hci_free_dev(hdev); kfree(data); 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; 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, }; static int __init btsdio_init(void) { BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION); return sdio_register_driver(&btsdio_driver); } static void __exit btsdio_exit(void) { sdio_unregister_driver(&btsdio_driver); } module_init(btsdio_init); module_exit(btsdio_exit); MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL");