diff options
Diffstat (limited to 'driver/bc12/max14637.c')
| -rw-r--r-- | driver/bc12/max14637.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/driver/bc12/max14637.c b/driver/bc12/max14637.c deleted file mode 100644 index ca06b26aeb..0000000000 --- a/driver/bc12/max14637.c +++ /dev/null @@ -1,193 +0,0 @@ -/* Copyright 2017 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. - */ - -/* - * MAX14637 USB BC 1.2 Charger Detector driver. - * - * NOTE: The driver assumes that CHG_AL_N and SW_OPEN are not connected, - * therefore the value of CHG_DET indicates whether the source is NOT a - * low-power standard downstream port (SDP). In order to use higher currents, - * the system will have to charge ramp. - */ - -#include "max14637.h" -#include "cannonlake.h" -#include "charge_manager.h" -#include "chipset.h" -#include "common.h" -#include "console.h" -#include "gpio.h" -#include "power.h" -#include "task.h" -#include "tcpm.h" -#include "timer.h" -#include "usb_charge.h" -#include "usb_pd.h" -#include "util.h" - -#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args) - -#if defined(CONFIG_CHARGE_RAMP_SW) || defined(CONFIG_CHARGE_RAMP_HW) -/** - * Returns true if the charger detect pin is activated. - * - * @parm cfg driver for chip to read the charger detect pin for. - * @return 1 if charger detect is activated (high when active high or - * low with active low), otherwise 0. - */ -static int is_chg_det_activated(const struct max14637_config_t * const cfg) -{ - return !!gpio_get_level(cfg->chg_det_pin) ^ - !!(cfg->flags & MAX14637_FLAGS_CHG_DET_ACTIVE_LOW); -} -#endif - -/** - * Activates the Chip Enable GPIO based on the enabled value. - * - * @param cfg driver for chip that will set chip enable gpio. - * @param enable 1 to activate gpio (high for active high and low for active - * low). - */ -static void activate_chip_enable( - const struct max14637_config_t * const cfg, const int enable) -{ - gpio_set_level( - cfg->chip_enable_pin, - !!enable ^ !!(cfg->flags & MAX14637_FLAGS_ENABLE_ACTIVE_LOW)); -} - -/** - * Perform BC1.2 detection and update charge manager. - * - * @param port: The Type-C port where VBUS is present. - */ -static void bc12_detect(const int port) -{ - const struct max14637_config_t * const cfg = &max14637_config[port]; - struct charge_port_info new_chg; - - /* - * Enable the IC to begin detection and connect switches if necessary. - */ - activate_chip_enable(cfg, 1); - - new_chg.voltage = USB_CHARGER_VOLTAGE_MV; -#if defined(CONFIG_CHARGE_RAMP_SW) || defined(CONFIG_CHARGE_RAMP_HW) - /* - * Apple or TomTom charger detection can take as long as 600ms. Wait a - * little bit longer for margin. - */ - msleep(630); - - /* - * The driver assumes that CHG_AL_N and SW_OPEN are not connected, - * therefore an activated CHG_DET indicates whether the source is NOT a - * low-power standard downstream port (SDP). The system will have to - * ramp the current to determine the limit. - */ - new_chg.current = is_chg_det_activated(cfg) ? 2400 : 500; -#else - /* - * If the board doesn't support charge ramping, then assume the lowest - * denominator; that is assume the charger detected is a weak dedicated - * charging port (DCP) which can only supply 500mA. - */ - new_chg.current = 500; -#endif /* !defined(CONFIG_CHARGE_RAMP_SW && CONFIG_CHARGE_RAMP_HW) */ - - charge_manager_update_charge(CHARGE_SUPPLIER_OTHER, port, &new_chg); -} - -/** - * Turn off the MAX14637 detector. - * - * @param port: Which USB Type-C port's BC1.2 detector to turn off. - */ -static void power_down_ic(const int port) -{ - const struct max14637_config_t * const cfg = &max14637_config[port]; - - /* Turn off the IC. */ - activate_chip_enable(cfg, 0); - - /* Let charge manager know there's no more charge available. */ - charge_manager_update_charge(CHARGE_SUPPLIER_OTHER, port, NULL); -} - -/** - * If VBUS is present, determine the charger type, otherwise power down the IC. - * - * @param port: Which USB Type-C port to examine. - */ -static void detect_or_power_down_ic(const int port) -{ - int vbus_present; - -#ifdef CONFIG_USB_PD_VBUS_DETECT_TCPC - vbus_present = tcpm_get_vbus_level(port); -#else - vbus_present = pd_snk_is_vbus_provided(port); -#endif /* !defined(CONFIG_USB_PD_VBUS_DETECT_TCPC) */ - - if (vbus_present) { -#if defined(CONFIG_POWER_PP5000_CONTROL) && defined(HAS_TASK_CHIPSET) - /* Turn on the 5V rail to allow the chip to be powered. */ - power_5v_enable(task_get_current(), 1); -#endif - bc12_detect(port); - } else { - power_down_ic(port); -#if defined(CONFIG_POWER_PP5000_CONTROL) && defined(HAS_TASK_CHIPSET) - /* Issue a request to turn off the rail. */ - power_5v_enable(task_get_current(), 0); -#endif - } -} - -void usb_charger_task(void *u) -{ - const int port = (intptr_t)u; - uint32_t evt; - - ASSERT(port >= 0 && port < CONFIG_USB_PD_PORT_MAX_COUNT); - - detect_or_power_down_ic(port); - - while (1) { - evt = task_wait_event(-1); - - if (evt & USB_CHG_EVENT_VBUS) - detect_or_power_down_ic(port); - } -} - -void usb_charger_set_switches(int port, enum usb_switch setting) -{ - /* - * The MAX14637 automatically sets up the USB 2.0 high-speed switches. - */ -} - -#if defined(CONFIG_CHARGE_RAMP_SW) || defined(CONFIG_CHARGE_RAMP_HW) -int usb_charger_ramp_allowed(int supplier) -{ - /* - * Due to the limitations in the application of the MAX14637, we - * don't quite know exactly what we're plugged into. Therefore, - * the supplier type will be CHARGE_SUPPLIER_OTHER. - */ - return supplier == CHARGE_SUPPLIER_OTHER; -} - -int usb_charger_ramp_max(int supplier, int sup_curr) -{ - /* Use the current limit that was decided by the MAX14637. */ - if (supplier == CHARGE_SUPPLIER_OTHER) - return sup_curr; - else - return 500; -} -#endif /* CONFIG_CHARGE_RAMP_SW || CONFIG_CHARGE_RAMP_HW */ |