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/* Copyright (c) 2012 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 charging control module for Chrome EC */
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "system.h"
#include "usb_charge.h"
#include "util.h"
#define CPUTS(outstr) cputs(CC_USBCHARGE, outstr)
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
#define USB_SYSJUMP_TAG 0x5550 /* "UP" - Usb Port */
#define USB_HOOK_VERSION 1
#ifndef CONFIG_USB_PORT_POWER_SMART_DEFAULT_MODE
#define CONFIG_USB_PORT_POWER_SMART_DEFAULT_MODE USB_CHARGE_MODE_SDP2
#endif
static uint8_t charge_mode[CONFIG_USB_PORT_POWER_SMART_PORT_COUNT];
/* GPIOs to enable/disable USB ports. Board specific. */
extern const int usb_port_enable[CONFIG_USB_PORT_POWER_SMART_PORT_COUNT];
#ifdef CONFIG_USB_PORT_POWER_SMART_CDP_SDP_ONLY
/*
* If we only support CDP and SDP, the control signals are hard-wired so
* there's nothing to do. The only to do is set ILIM_SEL.
*/
static void usb_charge_set_control_mode(int port_id, int mode) {}
#else /* !defined(CONFIG_USB_PORT_POWER_SMART_CDP_SDP_ONLY) */
static void usb_charge_set_control_mode(int port_id, int mode)
{
#ifdef CONFIG_USB_PORT_POWER_SMART_SIMPLE
/*
* One single shared control signal, so the last mode set to either
* port wins. Also, only CTL1 can be set; the other pins are
* hard-wired.
*/
gpio_set_level(GPIO_USB_CTL1, mode & 0x4);
#else
if (port_id == 0) {
gpio_set_level(GPIO_USB1_CTL1, mode & 0x4);
gpio_set_level(GPIO_USB1_CTL2, mode & 0x2);
gpio_set_level(GPIO_USB1_CTL3, mode & 0x1);
} else {
gpio_set_level(GPIO_USB2_CTL1, mode & 0x4);
gpio_set_level(GPIO_USB2_CTL2, mode & 0x2);
gpio_set_level(GPIO_USB2_CTL3, mode & 0x1);
}
#endif /* defined(CONFIG_USB_PORT_POWER_SMART_SIMPLE) */
}
#endif /* defined(CONFIG_USB_PORT_POWER_SMART_CDP_SDP_ONLY) */
static void usb_charge_set_enabled(int port_id, int en)
{
ASSERT(port_id < CONFIG_USB_PORT_POWER_SMART_PORT_COUNT);
gpio_set_level(usb_port_enable[port_id], en);
}
static void usb_charge_set_ilim(int port_id, int sel)
{
enum gpio_signal ilim_sel;
#if defined(CONFIG_USB_PORT_POWER_SMART_SIMPLE) || \
defined(CONFIG_USB_PORT_POWER_SMART_INVERTED)
/* ILIM_SEL is inverted. */
sel = !sel;
#endif
ilim_sel = GPIO_USB1_ILIM_SEL;
#if !defined(CONFIG_USB_PORT_POWER_SMART_SIMPLE) && \
CONFIG_USB_PORT_POWER_SMART_PORT_COUNT == 2
if (port_id != 0)
ilim_sel = GPIO_USB2_ILIM_SEL;
#endif
gpio_set_level(ilim_sel, sel);
}
static void usb_charge_all_ports_ctrl(enum usb_charge_mode mode)
{
int i;
for (i = 0; i < CONFIG_USB_PORT_POWER_SMART_PORT_COUNT; i++)
usb_charge_set_mode(i, mode);
}
int usb_charge_set_mode(int port_id, enum usb_charge_mode mode)
{
CPRINTS("USB charge p%d m%d", port_id, mode);
if (port_id >= CONFIG_USB_PORT_POWER_SMART_PORT_COUNT)
return EC_ERROR_INVAL;
switch (mode) {
case USB_CHARGE_MODE_DISABLED:
usb_charge_set_enabled(port_id, 0);
break;
case USB_CHARGE_MODE_SDP2:
usb_charge_set_control_mode(port_id, 7);
usb_charge_set_ilim(port_id, 0);
usb_charge_set_enabled(port_id, 1);
break;
case USB_CHARGE_MODE_CDP:
usb_charge_set_control_mode(port_id, 7);
usb_charge_set_ilim(port_id, 1);
usb_charge_set_enabled(port_id, 1);
break;
#ifndef CONFIG_USB_PORT_POWER_SMART_CDP_SDP_ONLY
case USB_CHARGE_MODE_DCP_SHORT:
usb_charge_set_control_mode(port_id, 4);
usb_charge_set_enabled(port_id, 1);
break;
#endif /* !defined(CONFIG_USB_PORT_POWER_SMART_CDP_SDP_ONLY) */
default:
return EC_ERROR_UNKNOWN;
}
charge_mode[port_id] = mode;
return EC_SUCCESS;
}
/*****************************************************************************/
/* Console commands */
static int command_set_mode(int argc, char **argv)
{
int port_id = -1;
int mode = -1;
char *e;
int i;
if (argc == 1) {
for (i = 0; i < CONFIG_USB_PORT_POWER_SMART_PORT_COUNT; i++)
ccprintf("Port %d: %d\n", i, charge_mode[i]);
return EC_SUCCESS;
}
if (argc != 3)
return EC_ERROR_PARAM_COUNT;
port_id = strtoi(argv[1], &e, 0);
if (*e || port_id < 0 ||
port_id >= CONFIG_USB_PORT_POWER_SMART_PORT_COUNT)
return EC_ERROR_PARAM1;
mode = strtoi(argv[2], &e, 0);
if (*e || mode < 0 || mode >= USB_CHARGE_MODE_COUNT)
return EC_ERROR_PARAM2;
return usb_charge_set_mode(port_id, mode);
}
DECLARE_CONSOLE_COMMAND(usbchargemode, command_set_mode,
"[<port> <0 | 1 | 2 | 3>]",
"Set USB charge mode");
/*
* Modes:
* 0=Disabled.
* 1=Standard downstream port.
* 2=Charging downstream port, BC 1.2.
* 3=Dedicated charging port, BC 1.2.
*/
/*****************************************************************************/
/* Host commands */
static int usb_charge_command_set_mode(struct host_cmd_handler_args *args)
{
const struct ec_params_usb_charge_set_mode *p = args->params;
if (usb_charge_set_mode(p->usb_port_id, p->mode) != EC_SUCCESS)
return EC_RES_ERROR;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_USB_CHARGE_SET_MODE,
usb_charge_command_set_mode,
EC_VER_MASK(0));
/*****************************************************************************/
/* Hooks */
static void usb_charge_preserve_state(void)
{
system_add_jump_tag(USB_SYSJUMP_TAG, USB_HOOK_VERSION,
sizeof(charge_mode), charge_mode);
}
DECLARE_HOOK(HOOK_SYSJUMP, usb_charge_preserve_state, HOOK_PRIO_DEFAULT);
static void usb_charge_init(void)
{
const uint8_t *prev;
int version, size, i;
prev = (const uint8_t *)system_get_jump_tag(USB_SYSJUMP_TAG,
&version, &size);
if (!prev || version != USB_HOOK_VERSION ||
size != sizeof(charge_mode)) {
usb_charge_all_ports_ctrl(USB_CHARGE_MODE_DISABLED);
return;
}
for (i = 0; i < CONFIG_USB_PORT_POWER_SMART_PORT_COUNT; i++)
usb_charge_set_mode(i, prev[i]);
}
DECLARE_HOOK(HOOK_INIT, usb_charge_init, HOOK_PRIO_DEFAULT);
static void usb_charge_resume(void)
{
/* Turn on USB ports on as we go into S0 from S3 or S5. */
usb_charge_all_ports_ctrl(CONFIG_USB_PORT_POWER_SMART_DEFAULT_MODE);
}
DECLARE_HOOK(HOOK_CHIPSET_RESUME, usb_charge_resume, HOOK_PRIO_DEFAULT);
static void usb_charge_shutdown(void)
{
/* Turn on USB ports off as we go back to S5. */
usb_charge_all_ports_ctrl(USB_CHARGE_MODE_DISABLED);
}
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, usb_charge_shutdown, HOOK_PRIO_DEFAULT);
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