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/*
*
* Bluetooth HCI UART driver for Broadcom devices
*
* Copyright (C) 2015 Intel Corporation
*
*
* 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/errno.h>
#include <linux/skbuff.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/tty.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "btbcm.h"
#include "hci_uart.h"
struct bcm_device {
struct list_head list;
struct platform_device *pdev;
const char *name;
struct gpio_desc *device_wakeup;
struct gpio_desc *shutdown;
struct clk *clk;
bool clk_enabled;
u32 init_speed;
#ifdef CONFIG_PM_SLEEP
struct hci_uart *hu;
bool is_suspended; /* suspend/resume flag */
#endif
};
struct bcm_data {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct bcm_device *dev;
};
/* List of BCM BT UART devices */
static DEFINE_SPINLOCK(bcm_device_list_lock);
static LIST_HEAD(bcm_device_list);
static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
struct bcm_update_uart_baud_rate param;
if (speed > 3000000) {
struct bcm_write_uart_clock_setting clock;
clock.type = BCM_UART_CLOCK_48MHZ;
BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type);
/* This Broadcom specific command changes the UART's controller
* clock for baud rate > 3000000.
*/
skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
BT_ERR("%s: BCM: failed to write clock command (%d)",
hdev->name, err);
return err;
}
kfree_skb(skb);
}
BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed);
param.zero = cpu_to_le16(0);
param.baud_rate = cpu_to_le32(speed);
/* This Broadcom specific command changes the UART's controller baud
* rate.
*/
skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m,
HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
int err = PTR_ERR(skb);
BT_ERR("%s: BCM: failed to write update baudrate command (%d)",
hdev->name, err);
return err;
}
kfree_skb(skb);
return 0;
}
/* bcm_device_exists should be protected by bcm_device_list_lock */
static bool bcm_device_exists(struct bcm_device *device)
{
struct list_head *p;
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
if (device == dev)
return true;
}
return false;
}
static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
{
if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
clk_enable(dev->clk);
gpiod_set_value_cansleep(dev->shutdown, powered);
gpiod_set_value_cansleep(dev->device_wakeup, powered);
if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
clk_disable(dev->clk);
dev->clk_enabled = powered;
return 0;
}
static int bcm_open(struct hci_uart *hu)
{
struct bcm_data *bcm;
struct list_head *p;
BT_DBG("hu %p", hu);
bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
if (!bcm)
return -ENOMEM;
skb_queue_head_init(&bcm->txq);
hu->priv = bcm;
spin_lock(&bcm_device_list_lock);
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
/* Retrieve saved bcm_device based on parent of the
* platform device (saved during device probe) and
* parent of tty device used by hci_uart
*/
if (hu->tty->dev->parent == dev->pdev->dev.parent) {
bcm->dev = dev;
hu->init_speed = dev->init_speed;
#ifdef CONFIG_PM_SLEEP
dev->hu = hu;
#endif
break;
}
}
if (bcm->dev)
bcm_gpio_set_power(bcm->dev, true);
spin_unlock(&bcm_device_list_lock);
return 0;
}
static int bcm_close(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
BT_DBG("hu %p", hu);
/* Protect bcm->dev against removal of the device or driver */
spin_lock(&bcm_device_list_lock);
if (bcm_device_exists(bcm->dev)) {
bcm_gpio_set_power(bcm->dev, false);
#ifdef CONFIG_PM_SLEEP
bcm->dev->hu = NULL;
#endif
}
spin_unlock(&bcm_device_list_lock);
skb_queue_purge(&bcm->txq);
kfree_skb(bcm->rx_skb);
kfree(bcm);
hu->priv = NULL;
return 0;
}
static int bcm_flush(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&bcm->txq);
return 0;
}
static int bcm_setup(struct hci_uart *hu)
{
char fw_name[64];
const struct firmware *fw;
unsigned int speed;
int err;
BT_DBG("hu %p", hu);
hu->hdev->set_bdaddr = btbcm_set_bdaddr;
err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
if (err)
return err;
err = request_firmware(&fw, fw_name, &hu->hdev->dev);
if (err < 0) {
BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name);
return 0;
}
err = btbcm_patchram(hu->hdev, fw);
if (err) {
BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err);
goto finalize;
}
/* Init speed if any */
if (hu->init_speed)
speed = hu->init_speed;
else if (hu->proto->init_speed)
speed = hu->proto->init_speed;
else
speed = 0;
if (speed)
hci_uart_set_baudrate(hu, speed);
/* Operational speed if any */
if (hu->oper_speed)
speed = hu->oper_speed;
else if (hu->proto->oper_speed)
speed = hu->proto->oper_speed;
else
speed = 0;
if (speed) {
err = bcm_set_baudrate(hu, speed);
if (!err)
hci_uart_set_baudrate(hu, speed);
}
finalize:
release_firmware(fw);
err = btbcm_finalize(hu->hdev);
return err;
}
static const struct h4_recv_pkt bcm_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
};
static int bcm_recv(struct hci_uart *hu, const void *data, int count)
{
struct bcm_data *bcm = hu->priv;
if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
return -EUNATCH;
bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
if (IS_ERR(bcm->rx_skb)) {
int err = PTR_ERR(bcm->rx_skb);
BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
bcm->rx_skb = NULL;
return err;
}
return count;
}
static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct bcm_data *bcm = hu->priv;
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(&bcm->txq, skb);
return 0;
}
static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
return skb_dequeue(&bcm->txq);
}
#ifdef CONFIG_PM_SLEEP
/* Platform suspend callback */
static int bcm_suspend(struct device *dev)
{
struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);
if (!bdev->is_suspended) {
hci_uart_set_flow_control(bdev->hu, true);
/* Once this callback returns, driver suspends BT via GPIO */
bdev->is_suspended = true;
}
/* Suspend the device */
if (bdev->device_wakeup) {
gpiod_set_value(bdev->device_wakeup, false);
BT_DBG("suspend, delaying 15 ms");
mdelay(15);
}
return 0;
}
/* Platform resume callback */
static int bcm_resume(struct device *dev)
{
struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
BT_DBG("resume (%p): is_suspended %d", bdev, bdev->is_suspended);
if (bdev->device_wakeup) {
gpiod_set_value(bdev->device_wakeup, true);
BT_DBG("resume, delaying 15 ms");
mdelay(15);
}
/* When this callback executes, the device has woken up already */
if (bdev->is_suspended) {
bdev->is_suspended = false;
hci_uart_set_flow_control(bdev->hu, false);
}
return 0;
}
#endif
static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
{ "device-wakeup-gpios", &device_wakeup_gpios, 1 },
{ "shutdown-gpios", &shutdown_gpios, 1 },
{ },
};
static int bcm_resource(struct acpi_resource *ares, void *data)
{
struct bcm_device *dev = data;
if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
struct acpi_resource_uart_serialbus *sb;
sb = &ares->data.uart_serial_bus;
if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
dev->init_speed = sb->default_baud_rate;
}
/* Always tell the ACPI core to skip this resource */
return 1;
}
static int bcm_acpi_probe(struct bcm_device *dev)
{
struct platform_device *pdev = dev->pdev;
const struct acpi_device_id *id;
struct gpio_desc *gpio;
struct acpi_device *adev;
LIST_HEAD(resources);
int ret;
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
if (!id)
return -ENODEV;
/* Retrieve GPIO data */
dev->name = dev_name(&pdev->dev);
ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
acpi_bcm_default_gpios);
if (ret)
return ret;
dev->clk = devm_clk_get(&pdev->dev, NULL);
gpio = devm_gpiod_get(&pdev->dev, "device-wakeup");
if (!IS_ERR(gpio)) {
ret = gpiod_direction_output(gpio, 0);
if (ret)
return ret;
dev->device_wakeup = gpio;
}
gpio = devm_gpiod_get(&pdev->dev, "shutdown");
if (!IS_ERR(gpio)) {
ret = gpiod_direction_output(gpio, 0);
if (ret)
return ret;
dev->shutdown = gpio;
}
/* Make sure at-least one of the GPIO is defined and that
* a name is specified for this instance
*/
if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
dev_err(&pdev->dev, "invalid platform data\n");
return -EINVAL;
}
/* Retrieve UART ACPI info */
adev = ACPI_COMPANION(&dev->pdev->dev);
if (!adev)
return 0;
acpi_dev_get_resources(adev, &resources, bcm_resource, dev);
return 0;
}
static int bcm_probe(struct platform_device *pdev)
{
struct bcm_device *dev;
struct acpi_device_id *pdata = pdev->dev.platform_data;
int ret;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->pdev = pdev;
if (ACPI_HANDLE(&pdev->dev)) {
ret = bcm_acpi_probe(dev);
if (ret)
return ret;
} else if (pdata) {
dev->name = pdata->id;
} else {
return -ENODEV;
}
platform_set_drvdata(pdev, dev);
dev_info(&pdev->dev, "%s device registered.\n", dev->name);
/* Place this instance on the device list */
spin_lock(&bcm_device_list_lock);
list_add_tail(&dev->list, &bcm_device_list);
spin_unlock(&bcm_device_list_lock);
bcm_gpio_set_power(dev, false);
return 0;
}
static int bcm_remove(struct platform_device *pdev)
{
struct bcm_device *dev = platform_get_drvdata(pdev);
spin_lock(&bcm_device_list_lock);
list_del(&dev->list);
spin_unlock(&bcm_device_list_lock);
acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
return 0;
}
static const struct hci_uart_proto bcm_proto = {
.id = HCI_UART_BCM,
.name = "BCM",
.init_speed = 115200,
.oper_speed = 4000000,
.open = bcm_open,
.close = bcm_close,
.flush = bcm_flush,
.setup = bcm_setup,
.set_baudrate = bcm_set_baudrate,
.recv = bcm_recv,
.enqueue = bcm_enqueue,
.dequeue = bcm_dequeue,
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id bcm_acpi_match[] = {
{ "BCM2E39", 0 },
{ "BCM2E67", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* Platform suspend and resume callbacks */
static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);
static struct platform_driver bcm_driver = {
.probe = bcm_probe,
.remove = bcm_remove,
.driver = {
.name = "hci_bcm",
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};
int __init bcm_init(void)
{
platform_driver_register(&bcm_driver);
return hci_uart_register_proto(&bcm_proto);
}
int __exit bcm_deinit(void)
{
platform_driver_unregister(&bcm_driver);
return hci_uart_unregister_proto(&bcm_proto);
}
|