[RFC 5/7] Bluetooth: hci_nokia: Introduce new driver

Sebastian Reichel
2016-08-13T03:16:03Z

This driver adds support for Nokia H4+ procotol used
for example by Nokia's internet tablets (N770 - N950).
---
drivers/bluetooth/Kconfig | 10 +
drivers/bluetooth/Makefile | 1 +
drivers/bluetooth/hci_ldisc.c | 6 +
drivers/bluetooth/hci_nokia.c | 734 ++++++++++++++++++++++++++++++++++++++++++
drivers/bluetooth/hci_nokia.h | 140 ++++++++
drivers/bluetooth/hci_uart.h | 8 +-
6 files changed, 898 insertions(+), 1 deletion(-)
create mode 100644 drivers/bluetooth/hci_nokia.c
create mode 100644 drivers/bluetooth/hci_nokia.h

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index cf50fd2e96df..c32d9d5ad1d2 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -86,6 +86,16 @@ config BT_HCIUART_H4

Say Y here to compile support for HCI UART (H4) protocol.

+config BT_HCIUART_NOKIA
+ bool "UART Nokia H4+ protocol support"
+ depends on BT_HCIUART
+ help
+ Nokia H4+ is serial protocol for communication between Bluetooth
+ device and host. This protocol is required for Bluetooth devices
+ with UART interface in Nokia devices.
+
+ Say Y here to compile support for Nokia's H4+ protocol.
+
config BT_HCIUART_BCSP
bool "BCSP protocol support"
depends on BT_HCIUART
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 9c18939fc5c9..f7951646ee14 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -37,6 +37,7 @@ hci_uart-$(CONFIG_BT_HCIUART_INTEL) += hci_intel.o
hci_uart-$(CONFIG_BT_HCIUART_BCM) += hci_bcm.o
hci_uart-$(CONFIG_BT_HCIUART_QCA) += hci_qca.o
hci_uart-$(CONFIG_BT_HCIUART_AG6XX) += hci_ag6xx.o
+hci_uart-$(CONFIG_BT_HCIUART_NOKIA) += hci_nokia.o
hci_uart-objs := $(hci_uart-y)

ccflags-y += -D__CHECK_ENDIAN__
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index dda97398c59a..83d0de94bf35 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -810,6 +810,9 @@ static int __init hci_uart_init(void)
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_init();
#endif
+#ifdef CONFIG_BT_HCIUART_NOKIA
+ nokia_init();
+#endif

return 0;
}
@@ -845,6 +848,9 @@ static void __exit hci_uart_exit(void)
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_deinit();
#endif
+#ifdef CONFIG_BT_HCIUART_NOKIA
+ nokia_deinit();
+#endif

/* Release tty registration of line discipline */
err = tty_unregister_ldisc(N_HCI);
diff --git a/drivers/bluetooth/hci_nokia.c b/drivers/bluetooth/hci_nokia.c
new file mode 100644
index 000000000000..efd4dd320838
--- /dev/null
+++ b/drivers/bluetooth/hci_nokia.c
@@ -0,0 +1,734 @@
+/*
+ *
+ * Bluetooth HCI UART H4 driver with Nokia Extensions
+ *
+ * Copyright (C) 2015 Marcel Holtmann <marcel@holtmann.org>
+ * Copyright (C) 2016 Sebastian Reichel <sre@kernel.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.
+ */
+
+#include <linux/module.h>
+
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+#include <linux/pm_runtime.h>
+#include <linux/firmware.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <linux/gpio/consumer.h>
+
+#include <linux/unaligned/le_struct.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "hci_uart.h"
+#include "hci_nokia.h"
+
+struct nokia_uart_dev {
+ struct device *dev;
+ struct tty_port *port;
+ struct gpio_desc *reset;
+ struct gpio_desc *wakeup_host;
+ struct gpio_desc *wakeup_bt;
+ unsigned long sysclk_speed;
+};
+
+struct nokia_bt_dev {
+ struct hci_uart *hu;
+ struct nokia_uart_dev *btdata;
+ int wake_irq;
+ bool wake_state;
+ struct sk_buff *rx_skb;
+ struct sk_buff_head txq;
+ bdaddr_t bdaddr;
+
+ int init_error;
+ struct completion init_completion;
+
+ uint8_t man_id;
+ uint8_t ver_id;
+};
+
+static char *nokia_get_fw_name(struct nokia_bt_dev *btdev)
+{
+ switch (btdev->man_id) {
+ case NOKIA_ID_CSR:
+ return FIRMWARE_CSR;
+ case NOKIA_ID_BCM2048:
+ return FIRMWARE_BCM2048;
+ case NOKIA_ID_TI1271:
+ return FIRMWARE_TI1271;
+ default:
+ return NULL;
+ }
+}
+
+static int hci_uart_wait_for_cts(struct hci_uart *hu, bool state,
+ int timeout_ms)
+{
+ unsigned long timeout;
+ int signal;
+
+ timeout = jiffies + msecs_to_jiffies(timeout_ms);
+ for (;;) {
+ signal = hu->tty->ops->tiocmget(hu->tty) & TIOCM_CTS;
+ if (!!signal == !!state) {
+ dev_dbg(hu->tty->dev, "wait for cts... received!\n");
+ return 0;
+ }
+ if (time_after(jiffies, timeout)) {
+ dev_dbg(hu->tty->dev, "wait for cts... timeout!\n");
+ return -ETIMEDOUT;
+ }
+ usleep_range(1000, 2000);
+ }
+}
+
+static int btdev_match(struct device *child, void *data)
+{
+ if (!strcmp(child->driver->name, "nokia-bluetooth"))
+ return 1;
+ else
+ return 0;
+}
+
+static irqreturn_t wakeup_handler(int irq, void *data)
+{
+ struct nokia_bt_dev *btdev = data;
+ struct device *serialdev = btdev->hu->tty->dev;
+ int wake_state = gpiod_get_value(btdev->btdata->wakeup_host);
+
+ dev_dbg(serialdev, "wakeup received: %d -> %d\n",
+ btdev->wake_state, wake_state);
+
+ if (btdev->wake_state == wake_state)
+ return IRQ_HANDLED;
+
+ if (wake_state)
+ pm_runtime_get_sync(serialdev);
+ else if (!wake_state)
+ pm_runtime_put(serialdev);
+
+ btdev->wake_state = wake_state;
+
+ return IRQ_HANDLED;
+}
+
+static int nokia_reset(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ int err;
+
+ /* reset routine */
+ gpiod_set_value_cansleep(btdev->btdata->reset, 0);
+ gpiod_set_value_cansleep(btdev->btdata->wakeup_bt, 1);
+
+ msleep(50);
+
+ /* safety check */
+ err = gpiod_get_value_cansleep(btdev->btdata->wakeup_host);
+ if (err == 1) {
+ dev_err(hu->tty->dev, "reset: host wakeup not low!\n");
+ return -EPROTO;
+ }
+
+ /* flush queues */
+ tty_ldisc_flush(hu->tty);
+ tty_driver_flush_buffer(hu->tty);
+
+ /* init uart */
+ hci_uart_init_tty(hu);
+ hci_uart_set_flow_control(hu, true);
+ hci_uart_set_baudrate(hu, INIT_SPEED);
+
+ gpiod_set_value_cansleep(btdev->btdata->reset, 1);
+ gpiod_set_value_cansleep(btdev->btdata->wakeup_bt, 0);
+
+ msleep(100);
+
+ err = gpiod_get_value_cansleep(btdev->btdata->wakeup_host);
+ if (err == 0) {
+ dev_err(hu->tty->dev, "reset: host wakeup not high!\n");
+ return -EPROTO;
+ }
+
+ /* wait for cts */
+ err = hci_uart_wait_for_cts(hu, true, 100);
+ if (err < 0) {
+ dev_err(hu->tty->dev, "CTS not received: %d\n", err);
+ return err;
+ }
+
+ gpiod_set_value_cansleep(btdev->btdata->wakeup_bt, 1);
+ hci_uart_set_flow_control(hu, false);
+
+ return 0;
+}
+
+static int nokia_send_alive_packet(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ struct hci_nokia_alive_hdr *hdr;
+ struct hci_nokia_alive_pkt *pkt;
+ struct sk_buff *skb;
+ int len;
+
+ dev_dbg(hu->tty->dev, "Sending alive packet...\n");
+
+ init_completion(&btdev->init_completion);
+
+ len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
+ skb = bt_skb_alloc(len, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ hci_skb_pkt_type(skb) = HCI_NOKIA_ALIVE_PKT;
+ memset(skb->data, 0x00, len);
+
+ hdr = (struct hci_nokia_alive_hdr *)skb_put(skb, sizeof(*hdr));
+ hdr->dlen = sizeof(*pkt);
+ pkt = (struct hci_nokia_alive_pkt *)skb_put(skb, sizeof(*pkt));
+ pkt->mid = NOKIA_ALIVE_REQ;
+
+ hu->hdev->send(hu->hdev, skb);
+
+ if (!wait_for_completion_interruptible_timeout(&btdev->init_completion,
+ msecs_to_jiffies(1000))) {
+ return -ETIMEDOUT;
+ }
+
+ if (btdev->init_error < 0)
+ return btdev->init_error;
+
+ return 0;
+}
+
+static int nokia_send_negotiation(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ struct hci_nokia_neg_cmd *neg_cmd;
+ struct hci_nokia_neg_hdr *neg_hdr;
+ struct sk_buff *skb;
+ int len, err;
+ u16 baud = DIV_ROUND_CLOSEST(BT_BAUDRATE_DIVIDER, MAX_BAUD_RATE);
+ int sysclk = btdev->btdata->sysclk_speed / 1000;
+
+ dev_dbg(hu->tty->dev, "Sending negotiation...\n");
+
+ len = H4_TYPE_SIZE + sizeof(*neg_hdr) + sizeof(*neg_cmd);
+ skb = bt_skb_alloc(len, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ hci_skb_pkt_type(skb) = HCI_NOKIA_NEG_PKT;
+
+ neg_hdr = (struct hci_nokia_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
+ neg_hdr->dlen = sizeof(*neg_cmd);
+
+ neg_cmd = (struct hci_nokia_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
+ neg_cmd->ack = NOKIA_NEG_REQ;
+ neg_cmd->baud = cpu_to_le16(baud);
+ neg_cmd->unused1 = 0x0000;
+ neg_cmd->proto = NOKIA_PROTO_BYTE;
+ neg_cmd->sys_clk = cpu_to_le16(sysclk);
+ neg_cmd->unused2 = 0x0000;
+
+ btdev->init_error = 0;
+ init_completion(&btdev->init_completion);
+
+ hu->hdev->send(hu->hdev, skb);
+
+ if (!wait_for_completion_interruptible_timeout(&btdev->init_completion,
+ msecs_to_jiffies(10000))) {
+ return -ETIMEDOUT;
+ }
+
+ if (btdev->init_error < 0)
+ return btdev->init_error;
+
+ /* Change to operational settings */
+ hci_uart_set_flow_control(hu, true); // disable flow control
+
+ /* setup negotiated max. baudrate */
+ hci_uart_set_baudrate(hu, MAX_BAUD_RATE);
+
+ err = hci_uart_wait_for_cts(hu, true, 100);
+ if (err < 0)
+ return err;
+
+ hci_uart_set_flow_control(hu, false); // re-enable flow control
+
+ dev_dbg(hu->tty->dev, "Negotiation successful...\n");
+
+ return 0;
+}
+
+static int nokia_setup_fw(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ const struct firmware *fw;
+ const u8 *fw_ptr;
+ size_t fw_size;
+ int err;
+
+ BT_DBG("hu %p", hu);
+
+ err = request_firmware(&fw, nokia_get_fw_name(btdev), hu->tty->dev);
+ if (err < 0) {
+ BT_ERR("%s: Failed to load Nokia firmware file (%d)",
+ hu->hdev->name, err);
+ return err;
+ }
+
+ fw_ptr = fw->data;
+ fw_size = fw->size;
+
+ while (fw_size >= 4) {
+ u16 pkt_size = get_unaligned_le16(fw_ptr);
+ u8 pkt_type = fw_ptr[2];
+ const struct hci_command_hdr *cmd;
+ u16 opcode;
+ struct sk_buff *skb;
+
+ switch (pkt_type) {
+ case HCI_COMMAND_PKT:
+ cmd = (struct hci_command_hdr *)(fw_ptr + 3);
+ opcode = le16_to_cpu(cmd->opcode);
+
+ skb = __hci_cmd_sync(hu->hdev, opcode, cmd->plen,
+ fw_ptr + 3 + HCI_COMMAND_HDR_SIZE,
+ HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ BT_ERR("%s: Firmware command %04x failed (%d)",
+ hu->hdev->name, opcode, err);
+ goto done;
+ }
+ kfree_skb(skb);
+ break;
+ case HCI_NOKIA_RADIO_PKT:
+ case HCI_NOKIA_NEG_PKT:
+ case HCI_NOKIA_ALIVE_PKT:
+ break;
+ }
+
+ fw_ptr += pkt_size + 2;
+ fw_size -= pkt_size + 2;
+ }
+
+done:
+ release_firmware(fw);
+ return err;
+}
+
+static int nokia_setup(struct hci_uart *hu)
+{
+ int err;
+
+ pm_runtime_get_sync(hu->tty->dev);
+
+ dev_dbg(hu->tty->dev, "Nokia H4+ protocol setup...\n");
+
+ /* 0. reset connection */
+ err = nokia_reset(hu);
+ if (err < 0) {
+ dev_err(hu->tty->dev, "Reset failed: %d\n", err);
+ goto out;
+ }
+
+ /* 1. negotiate speed etc */
+ err = nokia_send_negotiation(hu);
+ if (err < 0) {
+ dev_err(hu->tty->dev, "Negotiation failed: %d\n", err);
+ goto out;
+ }
+
+ /* 2. verify correct setup using alive packet */
+ err = nokia_send_alive_packet(hu);
+ if (err < 0) {
+ dev_err(hu->tty->dev, "Alive check failed: %d\n", err);
+ goto out;
+ }
+
+ /* 3. send firmware */
+ err = nokia_setup_fw(hu);
+ if (err < 0) {
+ dev_err(hu->tty->dev, "Could not setup FW: %d\n", err);
+ goto out;
+ }
+
+ hci_uart_set_flow_control(hu, true);
+ hci_uart_set_baudrate(hu, BC4_MAX_BAUD_RATE);
+ hci_uart_set_flow_control(hu, false);
+
+ dev_dbg(hu->tty->dev, "Nokia H4+ protocol setup done!\n");
+
+ /*
+ * TODO:
+ * disable wakeup_bt at this point and automatically enable it when
+ * data is about to be written until all data has been written (+ some
+ * delay).
+ *
+ * Since this is not yet support by the uart/tty kernel framework we
+ * will always keep enabled the wakeup_bt gpio for now, so that the
+ * bluetooth chip will never transit into idle modes.
+ */
+
+out:
+ pm_runtime_put(hu->tty->dev);
+
+ return err;
+}
+
+static int nokia_open(struct hci_uart *hu)
+{
+ struct device *serialdev = hu->tty->dev;
+ struct nokia_bt_dev *btdev;
+ struct device *uartbtdev;
+ int err;
+
+ btdev = kzalloc(sizeof(*btdev), GFP_KERNEL);
+ if (!btdev)
+ return -ENOMEM;
+
+ btdev->hu = hu;
+
+ skb_queue_head_init(&btdev->txq);
+
+ uartbtdev = device_find_child(serialdev, NULL, btdev_match);
+ if (!uartbtdev) {
+ dev_err(serialdev, "bluetooth device node not found!\n");
+ return -ENODEV;
+ }
+
+ btdev->btdata = dev_get_drvdata(uartbtdev);
+ if (!btdev->btdata)
+ return -EINVAL;
+
+ hu->priv = btdev;
+
+ /* register handler for host wakeup gpio */
+ btdev->wake_irq = gpiod_to_irq(btdev->btdata->wakeup_host);
+ err = request_threaded_irq(btdev->wake_irq, NULL, wakeup_handler,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "wakeup", btdev);
+ if (err) {
+ gpiod_set_value(btdev->btdata->reset, 0);
+ gpiod_set_value(btdev->btdata->wakeup_bt, 0);
+ return err;
+ }
+
+ dev_dbg(serialdev, "Nokia H4+ protocol initialized with %s!\n",
+ dev_name(uartbtdev));
+
+ pm_runtime_enable(hu->tty->dev);
+
+ return 0;
+}
+
+static int nokia_flush(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&btdev->txq);
+
+ return 0;
+}
+
+static int nokia_close(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+
+ hu->priv = NULL;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&btdev->txq);
+
+ kfree_skb(btdev->rx_skb);
+
+ free_irq(btdev->wake_irq, btdev);
+
+ /* disable module */
+ gpiod_set_value(btdev->btdata->reset, 0);
+ gpiod_set_value(btdev->btdata->wakeup_bt, 0);
+
+ hu->priv = NULL;
+ kfree(btdev);
+
+ pm_runtime_disable(hu->tty->dev);
+
+ return 0;
+}
+
+/* Enqueue frame for transmittion (padding, crc, etc) */
+static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ int err;
+
+ BT_DBG("hu %p skb %p", hu, skb);
+
+ /* Prepend skb with frame type */
+ memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
+
+ /* Packets must be word aligned */
+ if (skb->len % 2) {
+ err = skb_pad(skb, 1);
+ if (err)
+ return err;
+ *skb_put(skb, 1) = 0x00;
+ }
+
+ skb_queue_tail(&btdev->txq, skb);
+
+ return 0;
+}
+
+static int nokia_recv_negotiation_packet(struct hci_dev *hdev,
+ struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct nokia_bt_dev *btdev = hu->priv;
+ struct hci_nokia_neg_hdr *hdr;
+ struct hci_nokia_neg_evt *evt;
+ int ret = 0;
+
+ hdr = (struct hci_nokia_neg_hdr *)skb->data;
+ if (hdr->dlen != sizeof(*evt)) {
+ btdev->init_error = -EIO;
+ ret = -EIO;
+ goto finish_neg;
+ }
+
+ evt = (struct hci_nokia_neg_evt *)skb_pull(skb, sizeof(*hdr));
+
+ if (evt->ack != NOKIA_NEG_ACK) {
+ dev_err(hu->tty->dev, "Could not negotiate hci_nokia settings\n");
+ btdev->init_error = -EINVAL;
+ }
+
+ btdev->man_id = evt->man_id;
+ btdev->ver_id = evt->ver_id;
+
+ dev_dbg(hu->tty->dev, "NOKIA negotiation:\n");
+ dev_dbg(hu->tty->dev, "\tbaudrate = %u\n", evt->baud);
+ dev_dbg(hu->tty->dev, "\tsystem clock = %u\n", evt->sys_clk);
+ dev_dbg(hu->tty->dev, "\tmanufacturer id = %u\n", evt->man_id);
+ dev_dbg(hu->tty->dev, "\tversion id = %u\n", evt->ver_id);
+
+finish_neg:
+ complete(&btdev->init_completion);
+ kfree_skb(skb);
+ return ret;
+}
+
+static int nokia_recv_alive_packet(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct nokia_bt_dev *btdev = hu->priv;
+ struct hci_nokia_alive_hdr *hdr;
+ struct hci_nokia_alive_pkt *pkt;
+ int ret = 0;
+
+ hdr = (struct hci_nokia_alive_hdr *)skb->data;
+ if (hdr->dlen != sizeof(*pkt)) {
+ dev_err(hu->tty->dev, "Corrupted alive message\n");
+ btdev->init_error = -EIO;
+ ret = -EIO;
+ goto finish_alive;
+ }
+
+ pkt = (struct hci_nokia_alive_pkt *)skb_pull(skb, sizeof(*hdr));
+
+ if (pkt->mid != NOKIA_ALIVE_RESP) {
+ dev_err(hu->tty->dev, "Invalid alive response: 0x%02x!\n",
+ pkt->mid);
+ btdev->init_error = -EINVAL;
+ goto finish_alive;
+ }
+
+ dev_dbg(hu->tty->dev, "Received alive packet!\n");
+
+finish_alive:
+ complete(&btdev->init_completion);
+ kfree_skb(skb);
+ return ret;
+}
+
+static int nokia_recv_radio(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ /* Packets received on the dedicated radio channel are
+ * HCI events and so feed them back into the core.
+ */
+ bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
+ return hci_recv_frame(hdev, skb);
+}
+
+/* Recv data */
+static const struct h4_recv_pkt nokia_recv_pkts[] = {
+ { NOKIA_RECV_ACL, .recv = hci_recv_frame },
+ { NOKIA_RECV_SCO, .recv = hci_recv_frame },
+ { NOKIA_RECV_EVENT, .recv = hci_recv_frame },
+ { NOKIA_RECV_ALIVE, .recv = nokia_recv_alive_packet },
+ { NOKIA_RECV_NEG, .recv = nokia_recv_negotiation_packet },
+ { NOKIA_RECV_RADIO, .recv = nokia_recv_radio },
+};
+
+static int nokia_recv(struct hci_uart *hu, const void *data, int count)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+ int err;
+
+ if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
+ return -EUNATCH;
+
+ btdev->rx_skb = h4_recv_buf(hu->hdev, btdev->rx_skb, data, count,
+ nokia_recv_pkts, ARRAY_SIZE(nokia_recv_pkts));
+ if (IS_ERR(btdev->rx_skb)) {
+ err = PTR_ERR(btdev->rx_skb);
+ BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
+ btdev->rx_skb = NULL;
+ return err;
+ }
+
+ return count;
+}
+
+static struct sk_buff *nokia_dequeue(struct hci_uart *hu)
+{
+ struct nokia_bt_dev *btdev = hu->priv;
+
+ return skb_dequeue(&btdev->txq);
+}
+
+static const struct hci_uart_proto nokia_proto = {
+ .id = HCI_UART_NOKIA,
+ .name = "Nokia",
+ .open = nokia_open,
+ .close = nokia_close,
+ .recv = nokia_recv,
+ .enqueue = nokia_enqueue,
+ .dequeue = nokia_dequeue,
+ .flush = nokia_flush,
+ .setup = nokia_setup,
+};
+
+static int nokia_bluetooth_probe(struct platform_device *pdev)
+{
+ struct nokia_uart_dev *btdata;
+ struct device *bcmdev = &pdev->dev;
+ struct clk *sysclk;
+ int err = 0;
+
+ if(!bcmdev->parent) {
+ dev_err(bcmdev, "parent device missing!\n");
+ return -ENODEV;
+ }
+
+ btdata = devm_kmalloc(bcmdev, sizeof(*btdata), GFP_KERNEL);
+ if(!btdata)
+ return -ENOMEM;
+
+ btdata->dev = bcmdev;
+ dev_set_drvdata(bcmdev, btdata);
+
+ btdata->port = dev_get_drvdata(bcmdev->parent);
+ if(!btdata->port) {
+ dev_err(bcmdev, "port data missing in parent device!\n");
+ return -ENODEV;
+ }
+
+ btdata->reset = devm_gpiod_get(bcmdev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(btdata->reset)) {
+ err = PTR_ERR(btdata->reset);
+ dev_err(bcmdev, "could not get reset gpio: %d\n", err);
+ return err;
+ }
+
+ btdata->wakeup_host = devm_gpiod_get(bcmdev, "host-wakeup", GPIOD_IN);
+ if (IS_ERR(btdata->wakeup_host)) {
+ err = PTR_ERR(btdata->wakeup_host);
+ dev_err(bcmdev, "could not get host wakeup gpio: %d\n", err);
+ return err;
+ }
+
+
+ btdata->wakeup_bt = devm_gpiod_get(bcmdev, "bluetooth-wakeup",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(btdata->wakeup_bt)) {
+ err = PTR_ERR(btdata->wakeup_bt);
+ dev_err(bcmdev, "could not get BT wakeup gpio: %d\n", err);
+ return err;
+ }
+
+ sysclk = devm_clk_get(bcmdev, "sysclk");
+ if (IS_ERR(sysclk)) {
+ err = PTR_ERR(sysclk);
+ dev_err(bcmdev, "could not get sysclk: %d\n", err);
+ return err;
+ }
+
+ clk_prepare_enable(sysclk);
+ btdata->sysclk_speed = clk_get_rate(sysclk);
+ clk_disable_unprepare(sysclk);
+
+ dev_dbg(bcmdev, "parent uart: %s\n", dev_name(bcmdev->parent));
+ dev_dbg(bcmdev, "sysclk speed: %ld kHz\n", btdata->sysclk_speed / 1000);
+
+ /* TODO: open tty and setup line disector from kernel-side */
+
+ return err;
+}
+
+static const struct of_device_id nokia_bluetooth_of_match[] = {
+ { .compatible = "nokia,brcm,bcm2048", },
+ { .compatible = "nokia,ti,wl1271-bluetooth", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, nokia_bluetooth_of_match);
+
+static struct platform_driver platform_nokia_driver = {
+ .driver = {
+ .name = "nokia-bluetooth",
+ .of_match_table = nokia_bluetooth_of_match,
+ },
+ .probe = nokia_bluetooth_probe,
+};
+
+int __init nokia_init(void)
+{
+ platform_driver_register(&platform_nokia_driver);
+ return hci_uart_register_proto(&nokia_proto);
+}
+
+int __exit nokia_deinit(void)
+{
+ platform_driver_unregister(&platform_nokia_driver);
+ return hci_uart_unregister_proto(&nokia_proto);
+}
diff --git a/drivers/bluetooth/hci_nokia.h b/drivers/bluetooth/hci_nokia.h
new file mode 100644
index 000000000000..8c4d307840e5
--- /dev/null
+++ b/drivers/bluetooth/hci_nokia.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2016 Sebastian Reichel <sre@kernel.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.
+ */
+
+#ifndef __HCI_NOKIA_H
+#define __HCI_NOKIA_H
+
+#define NOKIA_ID_CSR 0x02
+#define NOKIA_ID_BCM2048 0x04
+#define NOKIA_ID_TI1271 0x31
+
+#define FIRMWARE_CSR "nokia/bc4fw.bin"
+#define FIRMWARE_BCM2048 "nokia/bcmfw.bin"
+#define FIRMWARE_TI1271 "nokia/ti1273.bin"
+
+#define NOKIA_BCM_BDADDR 0xfc01
+
+#define HCI_NOKIA_NEG_PKT 0x06
+#define HCI_NOKIA_ALIVE_PKT 0x07
+#define HCI_NOKIA_RADIO_PKT 0x08
+
+#define HCI_NOKIA_NEG_HDR_SIZE 1
+#define HCI_NOKIA_MAX_NEG_SIZE 255
+#define HCI_NOKIA_ALIVE_HDR_SIZE 1
+#define HCI_NOKIA_MAX_ALIVE_SIZE 255
+#define HCI_NOKIA_RADIO_HDR_SIZE 2
+#define HCI_NOKIA_MAX_RADIO_SIZE 255
+
+#define NOKIA_PROTO_PKT 0x44
+#define NOKIA_PROTO_BYTE 0x4c
+
+#define NOKIA_NEG_REQ 0x00
+#define NOKIA_NEG_ACK 0x20
+#define NOKIA_NEG_NAK 0x40
+
+#define H4_TYPE_SIZE 1
+
+#define NOKIA_RECV_ACL \
+ H4_RECV_ACL, \
+ .wordaligned = true
+
+#define NOKIA_RECV_SCO \
+ H4_RECV_SCO, \
+ .wordaligned = true
+
+#define NOKIA_RECV_EVENT \
+ H4_RECV_EVENT, \
+ .wordaligned = true
+
+#define NOKIA_RECV_ALIVE \
+ .type = HCI_NOKIA_ALIVE_PKT, \
+ .hlen = HCI_NOKIA_ALIVE_HDR_SIZE, \
+ .loff = 0, \
+ .lsize = 1, \
+ .maxlen = HCI_NOKIA_MAX_ALIVE_SIZE, \
+ .wordaligned = true
+
+#define NOKIA_RECV_NEG \
+ .type = HCI_NOKIA_NEG_PKT, \
+ .hlen = HCI_NOKIA_NEG_HDR_SIZE, \
+ .loff = 0, \
+ .lsize = 1, \
+ .maxlen = HCI_NOKIA_MAX_NEG_SIZE, \
+ .wordaligned = true
+
+#define NOKIA_RECV_RADIO \
+ .type = HCI_NOKIA_RADIO_PKT, \
+ .hlen = HCI_NOKIA_RADIO_HDR_SIZE, \
+ .loff = 1, \
+ .lsize = 1, \
+ .maxlen = HCI_NOKIA_MAX_RADIO_SIZE, \
+ .wordaligned = true
+
+struct hci_nokia_neg_hdr {
+ __u8 dlen;
+} __packed;
+
+struct hci_nokia_neg_cmd {
+ __u8 ack;
+ __u16 baud;
+ __u16 unused1;
+ __u8 proto;
+ __u16 sys_clk;
+ __u16 unused2;
+} __packed;
+
+static inline struct hci_nokia_neg_hdr *hci_nokia_neg_hdr(const struct sk_buff *skb)
+{
+ return (struct hci_nokia_neg_hdr *) skb->data;
+}
+
+#define NOKIA_ALIVE_REQ 0x55
+#define NOKIA_ALIVE_RESP 0xcc
+
+struct hci_nokia_alive_hdr {
+ __u8 dlen;
+} __packed;
+
+struct hci_nokia_alive_pkt {
+ __u8 mid;
+ __u8 unused;
+} __packed;
+
+static inline struct hci_nokia_alive_hdr *hci_nokia_alive_hdr(const struct sk_buff *skb)
+{
+ return (struct hci_nokia_alive_hdr *) skb->data;
+}
+
+struct hci_nokia_neg_evt {
+ __u8 ack;
+ __u16 baud;
+ __u16 unused1;
+ __u8 proto;
+ __u16 sys_clk;
+ __u16 unused2;
+ __u8 man_id;
+ __u8 ver_id;
+} __packed;
+
+#define BT_BAUDRATE_DIVIDER 384000000
+#define BC4_MAX_BAUD_RATE 3692300
+#define MAX_BAUD_RATE 921600
+#define INIT_SPEED 120000
+
+struct hci_nokia_radio_hdr {
+ __u8 evt;
+ __u8 dlen;
+} __packed;
+
+#endif
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index a7d67aec3632..314b243df996 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -35,7 +35,7 @@
#define HCIUARTGETFLAGS _IOR('U', 204, int)

/* UART protocols */
-#define HCI_UART_MAX_PROTO 10
+#define HCI_UART_MAX_PROTO 11

#define HCI_UART_H4 0
#define HCI_UART_BCSP 1
@@ -47,6 +47,7 @@
#define HCI_UART_BCM 7
#define HCI_UART_QCA 8
#define HCI_UART_AG6XX 9
+#define HCI_UART_NOKIA 10

#define HCI_UART_RAW_DEVICE 0
#define HCI_UART_RESET_ON_INIT 1
@@ -190,3 +191,8 @@ int qca_deinit(void);
int ag6xx_init(void);
int ag6xx_deinit(void);
#endif
+
+#ifdef CONFIG_BT_HCIUART_NOKIA
+int nokia_init(void);
+int nokia_deinit(void);
+#endif
--
2.8.1