--- /dev/null
+/*
+ * Atheros Communication Bluetooth HCIATH3K UART protocol
+ *
+ * HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
+ * power management protocol extension to H4 to support AR300x Bluetooth Chip.
+ *
+ * Copyright (c) 2009-2010 Atheros Communications Inc.
+ *
+ * Acknowledgements:
+ * This file is based on hci_h4.c, which was written
+ * by Maxim Krasnyansky and Marcel Holtmann.
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "hci_uart.h"
+
+struct ath_struct {
+ struct hci_uart *hu;
+ unsigned int cur_sleep;
+
+ struct sk_buff_head txq;
+ struct work_struct ctxtsw;
+};
+
+static int ath_wakeup_ar3k(struct tty_struct *tty)
+{
+ struct termios settings;
+ int status = tty->driver->ops->tiocmget(tty, NULL);
+
+ if (status & TIOCM_CTS)
+ return status;
+
+ /* Disable Automatic RTSCTS */
+ n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+ settings.c_cflag &= ~CRTSCTS;
+ n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+
+ /* Clear RTS first */
+ status = tty->driver->ops->tiocmget(tty, NULL);
+ tty->driver->ops->tiocmset(tty, NULL, 0x00, TIOCM_RTS);
+ mdelay(20);
+
+ /* Set RTS, wake up board */
+ status = tty->driver->ops->tiocmget(tty, NULL);
+ tty->driver->ops->tiocmset(tty, NULL, TIOCM_RTS, 0x00);
+ mdelay(20);
+
+ status = tty->driver->ops->tiocmget(tty, NULL);
+
+ n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+ settings.c_cflag |= CRTSCTS;
+ n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+
+ return status;
+}
+
+static void ath_hci_uart_work(struct work_struct *work)
+{
+ int status;
+ struct ath_struct *ath;
+ struct hci_uart *hu;
+ struct tty_struct *tty;
+
+ ath = container_of(work, struct ath_struct, ctxtsw);
+
+ hu = ath->hu;
+ tty = hu->tty;
+
+ /* verify and wake up controller */
+ if (ath->cur_sleep) {
+ status = ath_wakeup_ar3k(tty);
+ if (!(status & TIOCM_CTS))
+ return;
+ }
+
+ /* Ready to send Data */
+ clear_bit(HCI_UART_SENDING, &hu->tx_state);
+ hci_uart_tx_wakeup(hu);
+}
+
+/* Initialize protocol */
+static int ath_open(struct hci_uart *hu)
+{
+ struct ath_struct *ath;
+
+ BT_DBG("hu %p", hu);
+
+ ath = kzalloc(sizeof(*ath), GFP_ATOMIC);
+ if (!ath)
+ return -ENOMEM;
+
+ skb_queue_head_init(&ath->txq);
+
+ hu->priv = ath;
+ ath->hu = hu;
+
+ INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
+
+ return 0;
+}
+
+/* Flush protocol data */
+static int ath_flush(struct hci_uart *hu)
+{
+ struct ath_struct *ath = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&ath->txq);
+
+ return 0;
+}
+
+/* Close protocol */
+static int ath_close(struct hci_uart *hu)
+{
+ struct ath_struct *ath = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&ath->txq);
+
+ cancel_work_sync(&ath->ctxtsw);
+
+ hu->priv = NULL;
+ kfree(ath);
+
+ return 0;
+}
+
+#define HCI_OP_ATH_SLEEP 0xFC04
+
+/* Enqueue frame for transmittion */
+static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ struct ath_struct *ath = hu->priv;
+
+ if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
+ kfree(skb);
+ return 0;
+ }
+
+ /*
+ * Update power management enable flag with parameters of
+ * HCI sleep enable vendor specific HCI command.
+ */
+ if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
+ struct hci_command_hdr *hdr = (void *)skb->data;
+
+ if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
+ ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
+ }
+
+ BT_DBG("hu %p skb %p", hu, skb);
+
+ /* Prepend skb with frame type */
+ memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
+
+ skb_queue_tail(&ath->txq, skb);
+ set_bit(HCI_UART_SENDING, &hu->tx_state);
+
+ schedule_work(&ath->ctxtsw);
+
+ return 0;
+}
+
+static struct sk_buff *ath_dequeue(struct hci_uart *hu)
+{
+ struct ath_struct *ath = hu->priv;
+
+ return skb_dequeue(&ath->txq);
+}
+
+/* Recv data */
+static int ath_recv(struct hci_uart *hu, void *data, int count)
+{
+ if (hci_recv_stream_fragment(hu->hdev, data, count) < 0)
+ BT_ERR("Frame Reassembly Failed");
+
+ return count;
+}
+
+static struct hci_uart_proto athp = {
+ .id = HCI_UART_ATH3K,
+ .open = ath_open,
+ .close = ath_close,
+ .recv = ath_recv,
+ .enqueue = ath_enqueue,
+ .dequeue = ath_dequeue,
+ .flush = ath_flush,
+};
+
+int ath_init(void)
+{
+ int err = hci_uart_register_proto(&athp);
+
+ if (!err)
+ BT_INFO("HCIATH3K protocol initialized");
+ else
+ BT_ERR("HCIATH3K protocol registration failed");
+
+ return err;
+}
+
+int ath_deinit(void)
+{
+ return hci_uart_unregister_proto(&athp);
+}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff