diff options
Diffstat (limited to 'common/usb_charger.c')
| -rw-r--r-- | common/usb_charger.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/common/usb_charger.c b/common/usb_charger.c new file mode 100644 index 0000000000..bb85fc3c7f --- /dev/null +++ b/common/usb_charger.c @@ -0,0 +1,138 @@ +/* Copyright 2015 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* + * USB charger / BC1.2 task. This code assumes that CONFIG_CHARGE_MANAGER + * is defined and implemented. PI3USB9281 is the only charger detector + * currently supported. + */ + +#include "charge_manager.h" +#include "common.h" +#include "ec_commands.h" +#include "gpio.h" +#include "pi3usb9281.h" +#include "task.h" +#include "timer.h" +#include "usb_pd.h" + +/* Wait after a charger is detected to debounce pin contact order */ +#define USB_CHG_DEBOUNCE_DELAY_MS 1000 +/* + * Wait after reset, before re-enabling attach interrupt, so that the + * spurious attach interrupt from certain ports is ignored. + */ +#define USB_CHG_RESET_DELAY_MS 100 + +void usb_charger_task(void) +{ + int port = (task_get_current() == TASK_ID_USB_CHG_P0 ? 0 : 1); +#if (CONFIG_USB_PD_PORT_COUNT == 1) + int vbus_source = GPIO_USB_C0_5V_EN; +#else + int vbus_source = (port == 0 ? GPIO_USB_C0_5V_EN : GPIO_USB_C1_5V_EN); +#endif + int device_type, charger_status; + struct charge_port_info charge; + int type; + charge.voltage = USB_BC12_CHARGE_VOLTAGE; + + while (1) { + /* Read interrupt register to clear on chip */ + pi3usb9281_get_interrupts(port); + + if (gpio_get_level(vbus_source)) { + /* If we're sourcing VBUS then we're not charging */ + device_type = charger_status = 0; + } else { + /* Set device type */ + device_type = pi3usb9281_get_device_type(port); + charger_status = pi3usb9281_get_charger_status(port); + } + + /* Debounce pin plug order if we detect a charger */ + if (device_type || PI3USB9281_CHG_STATUS_ANY(charger_status)) { + msleep(USB_CHG_DEBOUNCE_DELAY_MS); + + /* + * Trigger chip reset to refresh detection registers. + * WARNING: This reset is acceptable for samus_pd, + * but may not be acceptable for devices that have + * an OTG / device mode, as we may be interrupting + * the connection. + */ + pi3usb9281_reset(port); + /* + * Restore data switch settings - switches return to + * closed on reset until restored. + */ + board_set_usb_switches(port, USB_SWITCH_RESTORE); + /* Clear possible disconnect interrupt */ + pi3usb9281_get_interrupts(port); + /* Mask attach interrupt */ + pi3usb9281_set_interrupt_mask(port, + 0xff & + ~PI3USB9281_INT_ATTACH); + /* Re-enable interrupts */ + pi3usb9281_enable_interrupts(port); + msleep(USB_CHG_RESET_DELAY_MS); + + /* Clear possible attach interrupt */ + pi3usb9281_get_interrupts(port); + /* Re-enable attach interrupt */ + pi3usb9281_set_interrupt_mask(port, 0xff); + + /* Re-read ID registers */ + device_type = pi3usb9281_get_device_type(port); + charger_status = pi3usb9281_get_charger_status(port); + } + + /* Attachment: decode + update available charge */ + if (device_type || PI3USB9281_CHG_STATUS_ANY(charger_status)) { + if (PI3USB9281_CHG_STATUS_ANY(charger_status)) + type = CHARGE_SUPPLIER_PROPRIETARY; + else if (device_type & PI3USB9281_TYPE_CDP) + type = CHARGE_SUPPLIER_BC12_CDP; + else if (device_type & PI3USB9281_TYPE_DCP) + type = CHARGE_SUPPLIER_BC12_DCP; + else if (device_type & PI3USB9281_TYPE_SDP) + type = CHARGE_SUPPLIER_BC12_SDP; + else + type = CHARGE_SUPPLIER_OTHER; + + charge.current = pi3usb9281_get_ilim(device_type, + charger_status); + charge_manager_update_charge(type, port, &charge); + } else { /* Detachment: update available charge to 0 */ + charge.current = 0; + charge_manager_update_charge( + CHARGE_SUPPLIER_PROPRIETARY, + port, + &charge); + charge_manager_update_charge( + CHARGE_SUPPLIER_BC12_CDP, + port, + &charge); + charge_manager_update_charge( + CHARGE_SUPPLIER_BC12_DCP, + port, + &charge); + charge_manager_update_charge( + CHARGE_SUPPLIER_BC12_SDP, + port, + &charge); + charge_manager_update_charge( + CHARGE_SUPPLIER_OTHER, + port, + &charge); + } + + /* notify host of power info change */ + pd_send_host_event(PD_EVENT_POWER_CHANGE); + + /* Wait for interrupt */ + task_wait_event(-1); + } +} |