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Bluetooth: hci_bcm: Add (runtime)pm support to the serdev driver 

Make the serdev driver use struct bcm_device as its driver data and share
all the pm / GPIO / IRQ related code paths with the platform driver.

After this commit the 2 drivers are in essence the same and the serdev
driver interface can be used for all ACPI enumerated HCI UARTs.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Hans de Goede 2017-10-04 20:43:43 +02:00 committed by Marcel Holtmann
parent 78277d7371
commit 8a92056837
1 changed files with 68 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
drivers/bluetooth/hci_bcm.c
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@ -52,8 +52,10 @@
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
/* platform device driver resources */
/* device driver resources */
struct bcm_device {
/* Must be the first member, hci_serdev.c expects this. */
struct hci_uart serdev_hu;
struct list_head list;
struct device *dev;
@ -76,11 +78,6 @@ struct bcm_device {
#endif
};
/* serdev driver resources */
struct bcm_serdev {
struct hci_uart hu;
};
/* generic bcm uart resources */
struct bcm_data {
struct sk_buff *rx_skb;
@ -155,6 +152,10 @@ static bool bcm_device_exists(struct bcm_device *device)
{
struct list_head *p;
/* Devices using serdev always exist */
if (device && device->hu && device->hu->serdev)
return true;
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
@ -200,7 +201,6 @@ static int bcm_request_irq(struct bcm_data *bcm)
struct bcm_device *bdev = bcm->dev;
int err;
/* If this is not a platform device, do not enable PM functionalities */
mutex_lock(&bcm_device_lock);
if (!bcm_device_exists(bdev)) {
err = -ENODEV;
@ -313,18 +313,17 @@ static int bcm_open(struct hci_uart *hu)
hu->priv = bcm;
/* If this is a serdev defined device, then only use
* serdev open primitive and skip the rest.
*/
mutex_lock(&bcm_device_lock);
if (hu->serdev) {
serdev_device_open(hu->serdev);
bcm->dev = serdev_device_get_drvdata(hu->serdev);
goto out;
}
if (!hu->tty->dev)
goto out;
mutex_lock(&bcm_device_lock);
list_for_each(p, &bcm_device_list) {
struct bcm_device *dev = list_entry(p, struct bcm_device, list);
@ -334,37 +333,45 @@ static int bcm_open(struct hci_uart *hu)
*/
if (hu->tty->dev->parent == dev->dev->parent) {
bcm->dev = dev;
hu->init_speed = dev->init_speed;
hu->oper_speed = dev->oper_speed;
#ifdef CONFIG_PM
dev->hu = hu;
#endif
bcm_gpio_set_power(bcm->dev, true);
break;
}
}
mutex_unlock(&bcm_device_lock);
out:
if (bcm->dev) {
hu->init_speed = bcm->dev->init_speed;
hu->oper_speed = bcm->dev->oper_speed;
bcm_gpio_set_power(bcm->dev, true);
}
mutex_unlock(&bcm_device_lock);
return 0;
}
static int bcm_close(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct bcm_device *bdev = bcm->dev;
struct bcm_device *bdev = NULL;
bt_dev_dbg(hu->hdev, "hu %p", hu);
/* If this is a serdev defined device, only use serdev
* close primitive and then continue as usual.
*/
if (hu->serdev)
serdev_device_close(hu->serdev);
/* Protect bcm->dev against removal of the device or driver */
mutex_lock(&bcm_device_lock);
if (bcm_device_exists(bdev)) {
if (hu->serdev) {
serdev_device_close(hu->serdev);
bdev = serdev_device_get_drvdata(hu->serdev);
} else if (bcm_device_exists(bcm->dev)) {
bdev = bcm->dev;
#ifdef CONFIG_PM
bdev->hu = NULL;
#endif
}
if (bdev) {
bcm_gpio_set_power(bdev, false);
#ifdef CONFIG_PM
pm_runtime_disable(bdev->dev);
@ -374,8 +381,6 @@ static int bcm_close(struct hci_uart *hu)
devm_free_irq(bdev->dev, bdev->irq, bdev);
device_init_wakeup(bdev->dev, false);
}
bdev->hu = NULL;
#endif
}
mutex_unlock(&bcm_device_lock);
@ -603,7 +608,7 @@ static int bcm_resume_device(struct device *dev)
#endif
#ifdef CONFIG_PM_SLEEP
/* Platform suspend callback */
/* suspend callback */
static int bcm_suspend(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
@ -611,8 +616,10 @@ static int bcm_suspend(struct device *dev)
bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
/* bcm_suspend can be called at any time as long as platform device is
* bound, so it should use bcm_device_lock to protect access to hci_uart
/*
* When used with a device instantiated as platform_device, bcm_suspend
* can be called at any time as long as the platform device is bound,
* so it should use bcm_device_lock to protect access to hci_uart
* and device_wake-up GPIO.
*/
mutex_lock(&bcm_device_lock);
@ -635,15 +642,17 @@ static int bcm_suspend(struct device *dev)
return 0;
}
/* Platform resume callback */
/* resume callback */
static int bcm_resume(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
/* bcm_resume can be called at any time as long as platform device is
* bound, so it should use bcm_device_lock to protect access to hci_uart
/*
* When used with a device instantiated as platform_device, bcm_resume
* can be called at any time as long as platform device is bound,
* so it should use bcm_device_lock to protect access to hci_uart
* and device_wake-up GPIO.
*/
mutex_lock(&bcm_device_lock);
@ -785,15 +794,6 @@ static int bcm_get_resources(struct bcm_device *dev)
}
dev_info(dev->dev, "BCM irq: %d\n", dev->irq);
/* 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(dev->dev, "invalid platform data\n");
return -EINVAL;
}
return 0;
}
@ -846,6 +846,12 @@ static int bcm_acpi_probe(struct bcm_device *dev)
}
#endif /* CONFIG_ACPI */
static int bcm_of_probe(struct bcm_device *bdev)
{
device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
return 0;
}
static int bcm_probe(struct platform_device *pdev)
{
struct bcm_device *dev;
@ -933,7 +939,7 @@ static const struct acpi_device_id bcm_acpi_match[] = {
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* Platform suspend and resume callbacks */
/* suspend and resume callbacks */
static const struct dev_pm_ops bcm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
@ -951,29 +957,39 @@ static struct platform_driver bcm_driver = {
static int bcm_serdev_probe(struct serdev_device *serdev)
{
struct bcm_serdev *bcmdev;
u32 speed;
struct bcm_device *bcmdev;
int err;
bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
if (!bcmdev)
return -ENOMEM;
bcmdev->hu.serdev = serdev;
bcmdev->dev = &serdev->dev;
bcmdev->hu = &bcmdev->serdev_hu;
bcmdev->serdev_hu.serdev = serdev;
serdev_device_set_drvdata(serdev, bcmdev);
err = device_property_read_u32(&serdev->dev, "max-speed", &speed);
if (!err)
bcmdev->hu.oper_speed = speed;
if (has_acpi_companion(&serdev->dev))
err = bcm_acpi_probe(bcmdev);
else
err = bcm_of_probe(bcmdev);
if (err)
return err;
return hci_uart_register_device(&bcmdev->hu, &bcm_proto);
err = bcm_get_resources(bcmdev);
if (err)
return err;
bcm_gpio_set_power(bcmdev, false);
return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
}
static void bcm_serdev_remove(struct serdev_device *serdev)
{
struct bcm_serdev *bcmdev = serdev_device_get_drvdata(serdev);
struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
hci_uart_unregister_device(&bcmdev->hu);
hci_uart_unregister_device(&bcmdev->serdev_hu);
}
#ifdef CONFIG_OF
@ -990,6 +1006,8 @@ static struct serdev_device_driver bcm_serdev_driver = {
.driver = {
.name = "hci_uart_bcm",
.of_match_table = of_match_ptr(bcm_bluetooth_of_match),
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};