diff options
| -rw-r--r-- | drivers/bluetooth/hci_intel.c | 202 |
1 files changed, 189 insertions, 13 deletions
diff --git a/drivers/bluetooth/hci_intel.c b/drivers/bluetooth/hci_intel.c index da3192aee5e1..cf07d1121956 100644 --- a/drivers/bluetooth/hci_intel.c +++ b/drivers/bluetooth/hci_intel.c @@ -25,7 +25,12 @@ #include <linux/errno.h> #include <linux/skbuff.h> #include <linux/firmware.h> +#include <linux/module.h> #include <linux/wait.h> +#include <linux/tty.h> +#include <linux/platform_device.h> +#include <linux/gpio/consumer.h> +#include <linux/acpi.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> @@ -39,6 +44,15 @@ #define STATE_FIRMWARE_FAILED 3 #define STATE_BOOTING 4 +struct intel_device { + struct list_head list; + struct platform_device *pdev; + struct gpio_desc *reset; +}; + +static LIST_HEAD(intel_device_list); +static DEFINE_SPINLOCK(intel_device_list_lock); + struct intel_data { struct sk_buff *rx_skb; struct sk_buff_head txq; @@ -77,6 +91,61 @@ static u8 intel_convert_speed(unsigned int speed) } } +static int intel_wait_booting(struct hci_uart *hu) +{ + struct intel_data *intel = hu->priv; + int err; + + err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING, + TASK_INTERRUPTIBLE, + msecs_to_jiffies(1000)); + + if (err == 1) { + BT_ERR("%s: Device boot interrupted", hu->hdev->name); + return -EINTR; + } + + if (err) { + BT_ERR("%s: Device boot timeout", hu->hdev->name); + return -ETIMEDOUT; + } + + return err; +} + +static int intel_set_power(struct hci_uart *hu, bool powered) +{ + struct list_head *p; + int err = -ENODEV; + + spin_lock(&intel_device_list_lock); + + list_for_each(p, &intel_device_list) { + struct intel_device *idev = list_entry(p, struct intel_device, + list); + + /* tty device and pdev device should share the same parent + * which is the UART port. + */ + if (hu->tty->dev->parent != idev->pdev->dev.parent) + continue; + + if (!idev->reset) { + err = -ENOTSUPP; + break; + } + + BT_INFO("hu %p, Switching compatible pm device (%s) to %u", + hu, dev_name(&idev->pdev->dev), powered); + + gpiod_set_value(idev->reset, powered); + } + + spin_unlock(&intel_device_list_lock); + + return err; +} + static int intel_open(struct hci_uart *hu) { struct intel_data *intel; @@ -90,6 +159,10 @@ static int intel_open(struct hci_uart *hu) skb_queue_head_init(&intel->txq); hu->priv = intel; + + if (!intel_set_power(hu, true)) + set_bit(STATE_BOOTING, &intel->flags); + return 0; } @@ -99,6 +172,8 @@ static int intel_close(struct hci_uart *hu) BT_DBG("hu %p", hu); + intel_set_power(hu, false); + skb_queue_purge(&intel->txq); kfree_skb(intel->rx_skb); kfree(intel); @@ -149,6 +224,18 @@ static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed) struct hci_dev *hdev = hu->hdev; u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 }; struct sk_buff *skb; + int err; + + /* This can be the first command sent to the chip, check + * that the controller is ready. + */ + err = intel_wait_booting(hu); + + clear_bit(STATE_BOOTING, &intel->flags); + + /* In case of timeout, try to continue anyway */ + if (err && err != ETIMEDOUT) + return err; BT_INFO("%s: Change controller speed to %d", hdev->name, speed); @@ -231,6 +318,15 @@ static int intel_setup(struct hci_uart *hu) if (oper_speed && init_speed && oper_speed != init_speed) speed_change = 1; + /* Check that the controller is ready */ + err = intel_wait_booting(hu); + + clear_bit(STATE_BOOTING, &intel->flags); + + /* In case of timeout, try to continue anyway */ + if (err && err != ETIMEDOUT) + return err; + set_bit(STATE_BOOTLOADER, &intel->flags); /* Read the Intel version information to determine if the device @@ -540,19 +636,11 @@ done: */ BT_INFO("%s: Waiting for device to boot", hdev->name); - err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING, - TASK_INTERRUPTIBLE, - msecs_to_jiffies(1000)); - - if (err == 1) { - BT_ERR("%s: Device boot interrupted", hdev->name); - return -EINTR; - } + err = intel_wait_booting(hu); + if (err) + return err; - if (err) { - BT_ERR("%s: Device boot timeout", hdev->name); - return -ETIMEDOUT; - } + clear_bit(STATE_BOOTING, &intel->flags); rettime = ktime_get(); delta = ktime_sub(rettime, calltime); @@ -584,7 +672,8 @@ static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb) struct intel_data *intel = hu->priv; struct hci_event_hdr *hdr; - if (!test_bit(STATE_BOOTLOADER, &intel->flags)) + if (!test_bit(STATE_BOOTLOADER, &intel->flags) && + !test_bit(STATE_BOOTING, &intel->flags)) goto recv; hdr = (void *)skb->data; @@ -700,12 +789,99 @@ static const struct hci_uart_proto intel_proto = { .dequeue = intel_dequeue, }; +#ifdef CONFIG_ACPI +static const struct acpi_device_id intel_acpi_match[] = { + { "INT33E1", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, intel_acpi_match); + +static int intel_acpi_probe(struct intel_device *idev) +{ + const struct acpi_device_id *id; + + id = acpi_match_device(intel_acpi_match, &idev->pdev->dev); + if (!id) + return -ENODEV; + + return 0; +} +#else +static int intel_acpi_probe(struct intel_device *idev) +{ + return -ENODEV; +} +#endif + +static int intel_probe(struct platform_device *pdev) +{ + struct intel_device *idev; + + idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL); + if (!idev) + return -ENOMEM; + + idev->pdev = pdev; + + if (ACPI_HANDLE(&pdev->dev)) { + int err = intel_acpi_probe(idev); + if (err) + return err; + } else { + return -ENODEV; + } + + idev->reset = devm_gpiod_get_optional(&pdev->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(idev->reset)) { + dev_err(&pdev->dev, "Unable to retrieve gpio\n"); + return PTR_ERR(idev->reset); + } + + platform_set_drvdata(pdev, idev); + + /* Place this instance on the device list */ + spin_lock(&intel_device_list_lock); + list_add_tail(&idev->list, &intel_device_list); + spin_unlock(&intel_device_list_lock); + + dev_info(&pdev->dev, "registered.\n"); + + return 0; +} + +static int intel_remove(struct platform_device *pdev) +{ + struct intel_device *idev = platform_get_drvdata(pdev); + + spin_lock(&intel_device_list_lock); + list_del(&idev->list); + spin_unlock(&intel_device_list_lock); + + dev_info(&pdev->dev, "unregistered.\n"); + + return 0; +} + +static struct platform_driver intel_driver = { + .probe = intel_probe, + .remove = intel_remove, + .driver = { + .name = "hci_intel", + .acpi_match_table = ACPI_PTR(intel_acpi_match), + }, +}; + int __init intel_init(void) { + platform_driver_register(&intel_driver); + return hci_uart_register_proto(&intel_proto); } int __exit intel_deinit(void) { + platform_driver_unregister(&intel_driver); + return hci_uart_unregister_proto(&intel_proto); } |