diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/bluetooth/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/bluetooth/Makefile | 2 | ||||
| -rw-r--r-- | drivers/bluetooth/hci_nokia.c | 820 |
3 files changed, 834 insertions, 0 deletions
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index a6a9dd4d0eef..8aafbed9e160 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -86,6 +86,18 @@ config BT_HCIUART_H4 Say Y here to compile support for HCI UART (H4) protocol. +config BT_HCIUART_NOKIA + tristate "UART Nokia H4+ protocol support" + depends on BT_HCIUART + depends on SERIAL_DEV_BUS + depends on PM + 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 fd571689eed6..a7f237320f4b 100644 --- a/drivers/bluetooth/Makefile +++ b/drivers/bluetooth/Makefile @@ -25,6 +25,8 @@ obj-$(CONFIG_BT_BCM) += btbcm.o obj-$(CONFIG_BT_RTL) += btrtl.o obj-$(CONFIG_BT_QCA) += btqca.o +obj-$(CONFIG_BT_HCIUART_NOKIA) += hci_nokia.o + btmrvl-y := btmrvl_main.o btmrvl-$(CONFIG_DEBUG_FS) += btmrvl_debugfs.o diff --git a/drivers/bluetooth/hci_nokia.c b/drivers/bluetooth/hci_nokia.c new file mode 100644 index 000000000000..4038daf78d24 --- /dev/null +++ b/drivers/bluetooth/hci_nokia.c @@ -0,0 +1,820 @@ +/* + * Bluetooth HCI UART H4 driver with Nokia Extensions AKA Nokia H4+ + * + * Copyright (C) 2015 Marcel Holtmann <marcel@holtmann.org> + * Copyright (C) 2015-2017 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/clk.h> +#include <linux/errno.h> +#include <linux/firmware.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/pm_runtime.h> +#include <linux/serdev.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/unaligned/le_struct.h> +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> + +#include "hci_uart.h" +#include "btbcm.h" + +#define NOKIA_ID_BCM2048 0x04 +#define NOKIA_ID_TI1271 0x31 + +#define FIRMWARE_BCM2048 "nokia/bcmfw.bin" +#define FIRMWARE_TI1271 "nokia/ti1273.bin" + +#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_ALIVE \ + .type = HCI_NOKIA_ALIVE_PKT, \ + .hlen = HCI_NOKIA_ALIVE_HDR_SIZE, \ + .loff = 0, \ + .lsize = 1, \ + .maxlen = HCI_NOKIA_MAX_ALIVE_SIZE \ + +#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 \ + +#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 \ + +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; + +#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; + +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 MAX_BAUD_RATE 3692300 +#define SETUP_BAUD_RATE 921600 +#define INIT_BAUD_RATE 120000 + +struct hci_nokia_radio_hdr { + u8 evt; + u8 dlen; +} __packed; + +struct nokia_bt_dev { + struct hci_uart hu; + struct serdev_device *serdev; + + struct gpio_desc *reset; + struct gpio_desc *wakeup_host; + struct gpio_desc *wakeup_bt; + unsigned long sysclk_speed; + + int wake_irq; + struct sk_buff *rx_skb; + struct sk_buff_head txq; + bdaddr_t bdaddr; + + int init_error; + struct completion init_completion; + + u8 man_id; + u8 ver_id; + + bool initialized; + bool tx_enabled; + bool rx_enabled; +}; + +static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb); + +static void nokia_flow_control(struct serdev_device *serdev, bool enable) +{ + if (enable) { + serdev_device_set_rts(serdev, true); + serdev_device_set_flow_control(serdev, true); + } else { + serdev_device_set_flow_control(serdev, false); + serdev_device_set_rts(serdev, false); + } +} + +static irqreturn_t wakeup_handler(int irq, void *data) +{ + struct nokia_bt_dev *btdev = data; + struct device *dev = &btdev->serdev->dev; + int wake_state = gpiod_get_value(btdev->wakeup_host); + + if (btdev->rx_enabled == wake_state) + return IRQ_HANDLED; + + if (wake_state) + pm_runtime_get(dev); + else + pm_runtime_put(dev); + + btdev->rx_enabled = wake_state; + + return IRQ_HANDLED; +} + +static int nokia_reset(struct hci_uart *hu) +{ + struct nokia_bt_dev *btdev = hu->priv; + struct device *dev = &btdev->serdev->dev; + int err; + + /* reset routine */ + gpiod_set_value_cansleep(btdev->reset, 1); + gpiod_set_value_cansleep(btdev->wakeup_bt, 1); + + msleep(100); + + /* safety check */ + err = gpiod_get_value_cansleep(btdev->wakeup_host); + if (err == 1) { + dev_err(dev, "reset: host wakeup not low!"); + return -EPROTO; + } + + /* flush queue */ + serdev_device_write_flush(btdev->serdev); + + /* init uart */ + nokia_flow_control(btdev->serdev, false); + serdev_device_set_baudrate(btdev->serdev, INIT_BAUD_RATE); + + gpiod_set_value_cansleep(btdev->reset, 0); + + /* wait for cts */ + err = serdev_device_wait_for_cts(btdev->serdev, true, 200); + if (err < 0) { + dev_err(dev, "CTS not received: %d", err); + return err; + } + + nokia_flow_control(btdev->serdev, true); + + return 0; +} + +static int nokia_send_alive_packet(struct hci_uart *hu) +{ + struct nokia_bt_dev *btdev = hu->priv; + struct device *dev = &btdev->serdev->dev; + struct hci_nokia_alive_hdr *hdr; + struct hci_nokia_alive_pkt *pkt; + struct sk_buff *skb; + int len; + + 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; + + nokia_enqueue(hu, skb); + hci_uart_tx_wakeup(hu); + + dev_dbg(dev, "Alive sent"); + + 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 device *dev = &btdev->serdev->dev; + 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(btdev->sysclk_speed * 10, SETUP_BAUD_RATE); + int sysclk = btdev->sysclk_speed / 1000; + + 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); + + nokia_enqueue(hu, skb); + hci_uart_tx_wakeup(hu); + + dev_dbg(dev, "Negotiation sent"); + + 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 previously negotiated speed. Flow Control + * is disabled until bluetooth adapter is ready to avoid + * broken bytes being received. + */ + nokia_flow_control(btdev->serdev, false); + serdev_device_set_baudrate(btdev->serdev, SETUP_BAUD_RATE); + err = serdev_device_wait_for_cts(btdev->serdev, true, 200); + if (err < 0) { + dev_err(dev, "CTS not received: %d", err); + return err; + } + nokia_flow_control(btdev->serdev, true); + + dev_dbg(dev, "Negotiation successful"); + + return 0; +} + +static int nokia_setup_fw(struct hci_uart *hu) +{ + struct nokia_bt_dev *btdev = hu->priv; + struct device *dev = &btdev->serdev->dev; + const char *fwname; + const struct firmware *fw; + const u8 *fw_ptr; + size_t fw_size; + int err; + + dev_dbg(dev, "setup firmware"); + + if (btdev->man_id == NOKIA_ID_BCM2048) { + fwname = FIRMWARE_BCM2048; + } else if (btdev->man_id == NOKIA_ID_TI1271) { + fwname = FIRMWARE_TI1271; + } else { + dev_err(dev, "Unsupported bluetooth device!"); + return -ENODEV; + } + + err = request_firmware(&fw, fwname, dev); + if (err < 0) { + dev_err(dev, "%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); + dev_err(dev, "%s: FW 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) +{ + struct nokia_bt_dev *btdev = hu->priv; + struct device *dev = &btdev->serdev->dev; + int err; + + btdev->initialized = false; + + nokia_flow_control(btdev->serdev, false); + + pm_runtime_get_sync(dev); + + if (btdev->tx_enabled) { + gpiod_set_value_cansleep(btdev->wakeup_bt, 0); + pm_runtime_put(&btdev->serdev->dev); + btdev->tx_enabled = false; + } + + dev_dbg(dev, "protocol setup"); + + /* 0. reset connection */ + err = nokia_reset(hu); + if (err < 0) { + dev_err(dev, "Reset failed: %d", err); + goto out; + } + + /* 1. negotiate speed etc */ + err = nokia_send_negotiation(hu); + if (err < 0) { + dev_err(dev, "Negotiation failed: %d", err); + goto out; + } + + /* 2. verify correct setup using alive packet */ + err = nokia_send_alive_packet(hu); + if (err < 0) { + dev_err(dev, "Alive check failed: %d", err); + goto out; + } + + /* 3. send firmware */ + err = nokia_setup_fw(hu); + if (err < 0) { + dev_err(dev, "Could not setup FW: %d", err); + goto out; + } + + nokia_flow_control(btdev->serdev, false); + serdev_device_set_baudrate(btdev->serdev, MAX_BAUD_RATE); + nokia_flow_control(btdev->serdev, true); + + if (btdev->man_id == NOKIA_ID_BCM2048) { + hu->hdev->set_bdaddr = btbcm_set_bdaddr; + set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks); + dev_dbg(dev, "bcm2048 has invalid bluetooth address!"); + } + + dev_dbg(dev, "protocol setup done!"); + + gpiod_set_value_cansleep(btdev->wakeup_bt, 0); + pm_runtime_put(dev); + btdev->tx_enabled = false; + btdev->initialized = true; + + return 0; +out: + pm_runtime_put(dev); + + return err; +} + +static int nokia_open(struct hci_uart *hu) +{ + struct device *dev = &hu->serdev->dev; + + dev_dbg(dev, "protocol open"); + + serdev_device_open(hu->serdev); + + pm_runtime_enable(dev); + + return 0; +} + +static int nokia_flush(struct hci_uart *hu) +{ + struct nokia_bt_dev *btdev = hu->priv; + + dev_dbg(&btdev->serdev->dev, "flush device"); + + skb_queue_purge(&btdev->txq); + + return 0; +} + +static int nokia_close(struct hci_uart *hu) +{ + struct nokia_bt_dev *btdev = hu->priv; + struct device *dev = &btdev->serdev->dev; + + dev_dbg(dev, "close device"); + + btdev->initialized = false; + + skb_queue_purge(&btdev->txq); + + kfree_skb(btdev->rx_skb); + + /* disable module */ + gpiod_set_value(btdev->reset, 1); + gpiod_set_value(btdev->wakeup_bt, 0); + + pm_runtime_disable(&btdev->serdev->dev); + serdev_device_close(btdev->serdev); + + 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; + + /* 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 device *dev = &btdev->serdev->dev; + 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(dev, "Negotiation received: wrong reply"); + btdev->init_error = -EINVAL; + ret = -EINVAL; + goto finish_neg; + } + + btdev->man_id = evt->man_id; + btdev->ver_id = evt->ver_id; + + dev_dbg(dev, "Negotiation received: baud=%u:clk=%u:manu=%u:vers=%u", + evt->baud, evt->sys_clk, evt->man_id, 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 device *dev = &btdev->serdev->dev; + 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(dev, "Corrupted alive message"); + 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(dev, "Alive received: invalid response: 0x%02x!", + pkt->mid); + btdev->init_error = -EINVAL; + ret = -EINVAL; + goto finish_alive; + } + + dev_dbg(dev, "Alive received"); + +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. + */ + hci_skb_pkt_type(skb) = HCI_EVENT_PKT; + return hci_recv_frame(hdev, skb); +} + +/* Recv data */ +static const struct h4_recv_pkt nokia_recv_pkts[] = { + { H4_RECV_ACL, .recv = hci_recv_frame }, + { H4_RECV_SCO, .recv = hci_recv_frame }, + { H4_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; + struct device *dev = &btdev->serdev->dev; + 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); + dev_err(dev, "Frame reassembly failed (%d)", 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; + struct device *dev = &btdev->serdev->dev; + struct sk_buff *result = skb_dequeue(&btdev->txq); + + if (!btdev->initialized) + return result; + + if (btdev->tx_enabled == !!result) + return result; + + if (result) { + pm_runtime_get_sync(dev); + gpiod_set_value_cansleep(btdev->wakeup_bt, 1); + } else { + serdev_device_wait_until_sent(btdev->serdev, 0); + gpiod_set_value_cansleep(btdev->wakeup_bt, 0); + pm_runtime_put(dev); + } + + btdev->tx_enabled = !!result; + + return result; +} + +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, + .manufacturer = 1, +}; + +static int nokia_bluetooth_serdev_probe(struct serdev_device *serdev) +{ + struct device *dev = &serdev->dev; + struct nokia_bt_dev *btdev; + struct clk *sysclk; + int err = 0; + + btdev = devm_kzalloc(dev, sizeof(*btdev), GFP_KERNEL); + if (!btdev) + return -ENOMEM; + + btdev->hu.serdev = btdev->serdev = serdev; + serdev_device_set_drvdata(serdev, btdev); + + btdev->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(btdev->reset)) { + err = PTR_ERR(btdev->reset); + dev_err(dev, "could not get reset gpio: %d", err); + return err; + } + + btdev->wakeup_host = devm_gpiod_get(dev, "host-wakeup", GPIOD_IN); + if (IS_ERR(btdev->wakeup_host)) { + err = PTR_ERR(btdev->wakeup_host); + dev_err(dev, "could not get host wakeup gpio: %d", err); + return err; + } + + btdev->wake_irq = gpiod_to_irq(btdev->wakeup_host); + + err = devm_request_threaded_irq(dev, btdev->wake_irq, NULL, + wakeup_handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + "wakeup", btdev); + if (err) { + dev_err(dev, "could request wakeup irq: %d", err); + return err; + } + + btdev->wakeup_bt = devm_gpiod_get(dev, "bluetooth-wakeup", + GPIOD_OUT_LOW); + if (IS_ERR(btdev->wakeup_bt)) { + err = PTR_ERR(btdev->wakeup_bt); + dev_err(dev, "could not get BT wakeup gpio: %d", err); + return err; + } + + sysclk = devm_clk_get(dev, "sysclk"); + if (IS_ERR(sysclk)) { + err = PTR_ERR(sysclk); + dev_err(dev, "could not get sysclk: %d", err); + return err; + } + + clk_prepare_enable(sysclk); + btdev->sysclk_speed = clk_get_rate(sysclk); + clk_disable_unprepare(sysclk); + + skb_queue_head_init(&btdev->txq); + + btdev->hu.priv = btdev; + btdev->hu.alignment = 2; /* Nokia H4+ is word aligned */ + + err = hci_uart_register_device(&btdev->hu, &nokia_proto); + if (err) { + dev_err(dev, "could not register bluetooth uart: %d", err); + return err; + } + + return 0; +} + +static void nokia_bluetooth_serdev_remove(struct serdev_device *serdev) +{ + struct nokia_bt_dev *btdev = serdev_device_get_drvdata(serdev); + struct hci_uart *hu = &btdev->hu; + struct hci_dev *hdev = hu->hdev; + + cancel_work_sync(&hu->write_work); + + hci_unregister_dev(hdev); + hci_free_dev(hdev); + hu->proto->close(hu); + + pm_runtime_disable(&btdev->serdev->dev); +} + +static int nokia_bluetooth_runtime_suspend(struct device *dev) +{ + struct serdev_device *serdev = to_serdev_device(dev); + + nokia_flow_control(serdev, false); + return 0; +} + +static int nokia_bluetooth_runtime_resume(struct device *dev) +{ + struct serdev_device *serdev = to_serdev_device(dev); + + nokia_flow_control(serdev, true); + return 0; +} + +static const struct dev_pm_ops nokia_bluetooth_pm_ops = { + SET_RUNTIME_PM_OPS(nokia_bluetooth_runtime_suspend, + nokia_bluetooth_runtime_resume, + NULL) +}; + +#ifdef CONFIG_OF +static const struct of_device_id nokia_bluetooth_of_match[] = { + { .compatible = "nokia,h4p-bluetooth", }, + {}, +}; +MODULE_DEVICE_TABLE(of, nokia_bluetooth_of_match); +#endif + +static struct serdev_device_driver nokia_bluetooth_serdev_driver = { + .probe = nokia_bluetooth_serdev_probe, + .remove = nokia_bluetooth_serdev_remove, + .driver = { + .name = "nokia-bluetooth", + .pm = &nokia_bluetooth_pm_ops, + .of_match_table = of_match_ptr(nokia_bluetooth_of_match), + }, +}; + +module_serdev_device_driver(nokia_bluetooth_serdev_driver); |