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https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
[Bluetooth] Add generic driver for Bluetooth SDIO devices
This patch adds a generic driver for Bluetooth SDIO devices. It supports Type-A and Type-B devices. Signed-off-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann
David S. Miller
parent
ac019360fe
commit
ddbaf13e36
3 changed files with 419 additions and 0 deletions
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@ -22,6 +22,17 @@ config BT_HCIUSB_SCO
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Say Y here to compile support for SCO over HCI USB.
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config BT_HCIBTSDIO
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tristate "HCI SDIO driver"
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depends on MMC
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help
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Bluetooth HCI SDIO driver.
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This driver is required if you want to use Bluetooth device with
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SDIO interface.
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Say Y here to compile support for Bluetooth SDIO devices into the
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kernel or say M to compile it as module (btsdio).
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config BT_HCIUART
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tristate "HCI UART driver"
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help
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@ -13,6 +13,8 @@ obj-$(CONFIG_BT_HCIBT3C) += bt3c_cs.o
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obj-$(CONFIG_BT_HCIBLUECARD) += bluecard_cs.o
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obj-$(CONFIG_BT_HCIBTUART) += btuart_cs.o
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obj-$(CONFIG_BT_HCIBTSDIO) += btsdio.o
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hci_uart-y := hci_ldisc.o
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hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o
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hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o
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406
drivers/bluetooth/btsdio.c
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406
drivers/bluetooth/btsdio.c
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@ -0,0 +1,406 @@
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/*
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*
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* Generic Bluetooth SDIO driver
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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* Copyright (C) 2007 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/mmc/sdio_ids.h>
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#include <linux/mmc/sdio_func.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#ifndef CONFIG_BT_HCIBTSDIO_DEBUG
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#undef BT_DBG
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#define BT_DBG(D...)
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#endif
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#define VERSION "0.1"
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static const struct sdio_device_id btsdio_table[] = {
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/* Generic Bluetooth Type-A SDIO device */
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{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },
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/* Generic Bluetooth Type-B SDIO device */
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{ SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(sdio, btsdio_table);
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struct btsdio_data {
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struct hci_dev *hdev;
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struct sdio_func *func;
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struct work_struct work;
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struct sk_buff_head txq;
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};
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#define REG_RDAT 0x00 /* Receiver Data */
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#define REG_TDAT 0x00 /* Transmitter Data */
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#define REG_PC_RRT 0x10 /* Read Packet Control */
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#define REG_PC_WRT 0x11 /* Write Packet Control */
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#define REG_RTC_STAT 0x12 /* Retry Control Status */
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#define REG_RTC_SET 0x12 /* Retry Control Set */
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#define REG_INTRD 0x13 /* Interrupt Indication */
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#define REG_CL_INTRD 0x13 /* Interrupt Clear */
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#define REG_EN_INTRD 0x14 /* Interrupt Enable */
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#define REG_MD_STAT 0x20 /* Bluetooth Mode Status */
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static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
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{
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int err;
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BT_DBG("%s", data->hdev->name);
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/* Prepend Type-A header */
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skb_push(skb, 4);
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skb->data[0] = (skb->len & 0x0000ff);
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skb->data[1] = (skb->len & 0x00ff00) >> 8;
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skb->data[2] = (skb->len & 0xff0000) >> 16;
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skb->data[3] = bt_cb(skb)->pkt_type;
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err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
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if (err < 0) {
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sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
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return err;
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}
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data->hdev->stat.byte_tx += skb->len;
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kfree_skb(skb);
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return 0;
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}
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static void btsdio_work(struct work_struct *work)
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{
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struct btsdio_data *data = container_of(work, struct btsdio_data, work);
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struct sk_buff *skb;
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int err;
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BT_DBG("%s", data->hdev->name);
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sdio_claim_host(data->func);
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while ((skb = skb_dequeue(&data->txq))) {
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err = btsdio_tx_packet(data, skb);
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if (err < 0) {
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data->hdev->stat.err_tx++;
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skb_queue_head(&data->txq, skb);
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break;
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}
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}
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sdio_release_host(data->func);
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}
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static int btsdio_rx_packet(struct btsdio_data *data)
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{
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u8 hdr[4] __attribute__ ((aligned(4)));
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struct sk_buff *skb;
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int err, len;
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BT_DBG("%s", data->hdev->name);
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err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
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if (err < 0)
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return err;
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len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
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if (len < 4 || len > 65543)
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return -EILSEQ;
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skb = bt_skb_alloc(len - 4, GFP_KERNEL);
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if (!skb) {
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/* Out of memory. Prepare a read retry and just
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* return with the expectation that the next time
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* we're called we'll have more memory. */
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return -ENOMEM;
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}
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skb_put(skb, len - 4);
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err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
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if (err < 0) {
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kfree(skb);
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return err;
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}
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data->hdev->stat.byte_rx += len;
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skb->dev = (void *) data->hdev;
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bt_cb(skb)->pkt_type = hdr[3];
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err = hci_recv_frame(skb);
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if (err < 0) {
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kfree(skb);
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return err;
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}
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sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);
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return 0;
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}
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static void btsdio_interrupt(struct sdio_func *func)
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{
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struct btsdio_data *data = sdio_get_drvdata(func);
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int intrd;
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BT_DBG("%s", data->hdev->name);
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intrd = sdio_readb(func, REG_INTRD, NULL);
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if (intrd & 0x01) {
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sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);
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if (btsdio_rx_packet(data) < 0) {
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data->hdev->stat.err_rx++;
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sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
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}
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}
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}
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static int btsdio_open(struct hci_dev *hdev)
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{
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struct btsdio_data *data = hdev->driver_data;
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int err;
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BT_DBG("%s", hdev->name);
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if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
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return 0;
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sdio_claim_host(data->func);
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err = sdio_enable_func(data->func);
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if (err < 0) {
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clear_bit(HCI_RUNNING, &hdev->flags);
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goto release;
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}
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err = sdio_claim_irq(data->func, btsdio_interrupt);
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if (err < 0) {
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sdio_disable_func(data->func);
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clear_bit(HCI_RUNNING, &hdev->flags);
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goto release;
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}
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if (data->func->class == SDIO_CLASS_BT_B)
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sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);
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sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);
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release:
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sdio_release_host(data->func);
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return err;
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}
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static int btsdio_close(struct hci_dev *hdev)
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{
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struct btsdio_data *data = hdev->driver_data;
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BT_DBG("%s", hdev->name);
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if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
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return 0;
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sdio_claim_host(data->func);
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sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);
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sdio_release_irq(data->func);
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sdio_disable_func(data->func);
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sdio_release_host(data->func);
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return 0;
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}
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static int btsdio_flush(struct hci_dev *hdev)
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{
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struct btsdio_data *data = hdev->driver_data;
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BT_DBG("%s", hdev->name);
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skb_queue_purge(&data->txq);
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return 0;
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}
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static int btsdio_send_frame(struct sk_buff *skb)
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{
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struct hci_dev *hdev = (struct hci_dev *) skb->dev;
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struct btsdio_data *data = hdev->driver_data;
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BT_DBG("%s", hdev->name);
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if (!test_bit(HCI_RUNNING, &hdev->flags))
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return -EBUSY;
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switch (bt_cb(skb)->pkt_type) {
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case HCI_COMMAND_PKT:
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hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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hdev->stat.sco_tx++;
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break;
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default:
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return -EILSEQ;
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}
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skb_queue_tail(&data->txq, skb);
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schedule_work(&data->work);
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return 0;
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}
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static void btsdio_destruct(struct hci_dev *hdev)
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{
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struct btsdio_data *data = hdev->driver_data;
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BT_DBG("%s", hdev->name);
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kfree(data);
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}
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static int btsdio_probe(struct sdio_func *func,
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const struct sdio_device_id *id)
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{
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struct btsdio_data *data;
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struct hci_dev *hdev;
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struct sdio_func_tuple *tuple = func->tuples;
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int err;
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BT_DBG("func %p id %p class 0x%04x", func, id, func->class);
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while (tuple) {
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BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
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tuple = tuple->next;
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->func = func;
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INIT_WORK(&data->work, btsdio_work);
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skb_queue_head_init(&data->txq);
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hdev = hci_alloc_dev();
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if (!hdev) {
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kfree(data);
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return -ENOMEM;
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}
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hdev->type = HCI_SDIO;
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hdev->driver_data = data;
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data->hdev = hdev;
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SET_HCIDEV_DEV(hdev, &func->dev);
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hdev->open = btsdio_open;
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hdev->close = btsdio_close;
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hdev->flush = btsdio_flush;
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hdev->send = btsdio_send_frame;
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hdev->destruct = btsdio_destruct;
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hdev->owner = THIS_MODULE;
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err = hci_register_dev(hdev);
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if (err < 0) {
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hci_free_dev(hdev);
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kfree(data);
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return err;
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}
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sdio_set_drvdata(func, data);
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return 0;
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}
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static void btsdio_remove(struct sdio_func *func)
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{
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struct btsdio_data *data = sdio_get_drvdata(func);
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struct hci_dev *hdev;
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BT_DBG("func %p", func);
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if (!data)
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return;
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hdev = data->hdev;
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sdio_set_drvdata(func, NULL);
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hci_unregister_dev(hdev);
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hci_free_dev(hdev);
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}
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static struct sdio_driver btsdio_driver = {
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.name = "btsdio",
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.probe = btsdio_probe,
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.remove = btsdio_remove,
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.id_table = btsdio_table,
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};
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static int __init btsdio_init(void)
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{
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BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);
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return sdio_register_driver(&btsdio_driver);
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}
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static void __exit btsdio_exit(void)
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{
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sdio_unregister_driver(&btsdio_driver);
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}
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module_init(btsdio_init);
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module_exit(btsdio_exit);
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MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
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MODULE_DESCRIPTION("Generic Bluetooth SDIO driver ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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