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/* Copyright (c) 2014 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.
*
* Pericom PI3USB3281 USB port switch driver.
*/
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "task.h"
#include "timer.h"
#include "pi3usb9281.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_USBCHARGE, outstr)
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
/* 8-bit I2C address */
#define PI3USB9281_I2C_ADDR (0x25 << 1)
/* Delay values */
#define PI3USB9281_SW_RESET_DELAY 20
#ifdef CONFIG_USB_SWITCH_PI3USB9281_MUX_GPIO
#define PI3USB9281_COUNT 2
struct mutex mux_lock;
static inline void select_chip(uint8_t chip_idx)
{
mutex_lock(&mux_lock);
gpio_set_level(CONFIG_USB_SWITCH_PI3USB9281_MUX_GPIO, chip_idx);
}
static inline void unselect_chip(void)
{
/* Just release the mutex, no need to change the mux gpio */
mutex_unlock(&mux_lock);
}
#else
#define PI3USB9281_COUNT 1
#define select_chip(x)
#define unselect_chip()
#endif
static int saved_interrupts[PI3USB9281_COUNT];
uint8_t pi3usb9281_read(uint8_t chip_idx, uint8_t reg)
{
int res, val;
select_chip(chip_idx);
res = i2c_read8(I2C_PORT_MASTER, PI3USB9281_I2C_ADDR, reg, &val);
unselect_chip();
if (res)
return 0xee;
return val;
}
int pi3usb9281_write(uint8_t chip_idx, uint8_t reg, uint8_t val)
{
int res;
select_chip(chip_idx);
res = i2c_write8(I2C_PORT_MASTER, PI3USB9281_I2C_ADDR, reg, val);
unselect_chip();
if (res)
CPRINTS("PI3USB9281 I2C write failed");
return res;
}
int pi3usb9281_enable_interrupts(uint8_t chip_idx)
{
uint8_t ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL);
if (ctrl == 0xee)
return EC_ERROR_UNKNOWN;
return pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL,
ctrl & ~PI3USB9281_CTRL_INT_DIS &
PI3USB9281_CTRL_MASK);
}
int pi3usb9281_disable_interrupts(uint8_t chip_idx)
{
uint8_t ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL);
int rv;
if (ctrl == 0xee)
return EC_ERROR_UNKNOWN;
rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL,
(ctrl | PI3USB9281_CTRL_INT_DIS) &
PI3USB9281_CTRL_MASK);
pi3usb9281_get_interrupts(chip_idx);
return rv;
}
int pi3usb9281_set_interrupt_mask(uint8_t chip_idx, uint8_t mask)
{
return pi3usb9281_write(chip_idx, PI3USB9281_REG_INT_MASK, ~mask);
}
int pi3usb9281_get_interrupts(uint8_t chip_idx)
{
int ret = pi3usb9281_peek_interrupts(chip_idx);
if (chip_idx >= PI3USB9281_COUNT)
return EC_ERROR_PARAM1;
saved_interrupts[chip_idx] = 0;
return ret;
}
int pi3usb9281_peek_interrupts(uint8_t chip_idx)
{
if (chip_idx >= PI3USB9281_COUNT)
return EC_ERROR_PARAM1;
saved_interrupts[chip_idx] |= pi3usb9281_read(chip_idx,
PI3USB9281_REG_INT);
return saved_interrupts[chip_idx];
}
int pi3usb9281_get_device_type(uint8_t chip_idx)
{
return pi3usb9281_read(chip_idx, PI3USB9281_REG_DEV_TYPE) & 0x77;
}
int pi3usb9281_get_charger_status(uint8_t chip_idx)
{
return pi3usb9281_read(chip_idx, PI3USB9281_REG_CHG_STATUS) & 0x1f;
}
int pi3usb9281_get_ilim(int device_type, int charger_status)
{
/* Limit USB port current. 500mA for not listed types. */
int current_limit_ma = 500;
if (charger_status & PI3USB9281_CHG_CAR_TYPE1 ||
charger_status & PI3USB9281_CHG_CAR_TYPE2)
current_limit_ma = 3000;
else if (charger_status & PI3USB9281_CHG_APPLE_1A)
current_limit_ma = 1000;
else if (charger_status & PI3USB9281_CHG_APPLE_2A)
current_limit_ma = 2000;
else if (charger_status & PI3USB9281_CHG_APPLE_2_4A)
current_limit_ma = 2400;
else if (device_type & PI3USB9281_TYPE_CDP)
current_limit_ma = 1500;
else if (device_type & PI3USB9281_TYPE_DCP)
current_limit_ma = 500;
return current_limit_ma;
}
int pi3usb9281_get_vbus(uint8_t chip_idx)
{
int vbus = pi3usb9281_read(chip_idx, PI3USB9281_REG_VBUS);
if (vbus == 0xee)
return EC_ERROR_UNKNOWN;
return !!(vbus & 0x2);
}
int pi3usb9281_reset(uint8_t chip_idx)
{
int rv = pi3usb9281_write(chip_idx, PI3USB9281_REG_RESET, 0x1);
if (!rv)
/* Reset takes ~15ms. Wait for 20ms to be safe. */
msleep(PI3USB9281_SW_RESET_DELAY);
return rv;
}
int pi3usb9281_set_switch_manual(uint8_t chip_idx, int val)
{
uint8_t ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL);
if (ctrl == 0xee)
return EC_ERROR_UNKNOWN;
if (val)
ctrl &= ~PI3USB9281_CTRL_AUTO;
else
ctrl |= PI3USB9281_CTRL_AUTO;
return pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL,
ctrl & PI3USB9281_CTRL_MASK);
}
int pi3usb9281_set_pins(uint8_t chip_idx, uint8_t val)
{
return pi3usb9281_write(chip_idx, PI3USB9281_REG_MANUAL, val);
}
int pi3usb9281_set_switches(uint8_t chip_idx, int open)
{
uint8_t ctrl = pi3usb9281_read(chip_idx, PI3USB9281_REG_CONTROL);
if (ctrl == 0xee)
return EC_ERROR_UNKNOWN;
if (open)
ctrl &= ~PI3USB9281_CTRL_SWITCH_AUTO;
else
ctrl |= PI3USB9281_CTRL_SWITCH_AUTO;
return pi3usb9281_write(chip_idx, PI3USB9281_REG_CONTROL,
ctrl & PI3USB9281_CTRL_MASK);
}
static void pi3usb9281_init(void)
{
uint8_t dev_id;
int i;
for (i = 0; i < PI3USB9281_COUNT; i++) {
dev_id = pi3usb9281_read(i, PI3USB9281_REG_DEV_ID);
if (dev_id != PI3USB9281_DEV_ID &&
dev_id != PI3USB9281_DEV_ID_A)
CPRINTS("PI3USB9281[%d] invalid ID 0x%02x", i, dev_id);
}
}
DECLARE_HOOK(HOOK_INIT, pi3usb9281_init, HOOK_PRIO_LAST);
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