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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.
*
* TI TSU6721 USB port switch driver.
*/
#include "board.h"
#include "console.h"
#include "ec_commands.h"
#include "hooks.h"
#include "host_command.h"
#include "i2c.h"
#include "system.h"
#include "timer.h"
#include "tsu6721.h"
#include "uart.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_USBCHARGE, outstr)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)
/* 8-bit I2C address */
#define TSU6721_I2C_ADDR (0x25 << 1)
uint8_t tsu6721_read(uint8_t reg)
{
int res;
int val;
res = i2c_read8(I2C_PORT_HOST, TSU6721_I2C_ADDR, reg, &val);
if (res)
return 0xee;
return val;
}
void tsu6721_write(uint8_t reg, uint8_t val)
{
int res;
res = i2c_write8(I2C_PORT_HOST, TSU6721_I2C_ADDR, reg, val);
if (res)
CPRINTF("[%T TSU6721 I2C write failed]\n");
}
void tsu6721_enable_interrupts(int mask)
{
int ctrl = tsu6721_read(TSU6721_REG_CONTROL);
tsu6721_write(TSU6721_REG_INT_MASK1, (~mask) & 0xff);
tsu6721_write(TSU6721_REG_INT_MASK2, ((~mask) >> 8) & 0xff);
tsu6721_write(TSU6721_REG_CONTROL, ctrl & 0x1e);
}
void tsu6721_disable_interrupt(void)
{
int ctrl = tsu6721_read(TSU6721_REG_CONTROL);
tsu6721_write(TSU6721_REG_CONTROL, ctrl | 0x1);
}
int tsu6721_get_interrupts(void)
{
return (tsu6721_read(TSU6721_REG_INT1) << 8) |
(tsu6721_read(TSU6721_REG_INT2));
}
int tsu6721_get_device_type(void)
{
return (tsu6721_read(TSU6721_REG_DEV_TYPE3) << 16) |
(tsu6721_read(TSU6721_REG_DEV_TYPE2) << 8) |
(tsu6721_read(TSU6721_REG_DEV_TYPE1));
}
int tsu6721_mux(enum tsu6721_mux sel)
{
uint8_t id = tsu6721_read(TSU6721_REG_ADC);
uint8_t vbus1 = tsu6721_read(TSU6721_REG_DEV_TYPE1) & 0x74;
uint8_t vbus3 = tsu6721_read(TSU6721_REG_DEV_TYPE3) & 0x74;
uint8_t ctrl = tsu6721_read(TSU6721_REG_CONTROL);
/*
* silicon limitation: the chip stays in low power mode and cannot
* activate manual mode if it is not detecting either a VBUS or
* something known on the ID pin
*/
if ((id == 0x1f) && !vbus1 && !vbus3) {
CPRINTF("TSU6721 cannot use manual mode: no VBUS or ID\n");
return EC_ERROR_INVAL;
}
if (sel == TSU6721_MUX_NONE) {
tsu6721_write(TSU6721_REG_CONTROL, ctrl | TSU6721_CTRL_AUTO);
} else {
tsu6721_write(TSU6721_REG_MANUAL1, sel);
tsu6721_write(TSU6721_REG_CONTROL, ctrl & ~TSU6721_CTRL_AUTO);
}
return EC_SUCCESS;
}
void tsu6721_init(void)
{
uint8_t settings;
uint8_t dev_id = tsu6721_read(TSU6721_REG_DEV_ID);
if (dev_id != 0x0a) {
CPRINTF("TSU6721 invalid device ID 0x%02x\n", dev_id);
return;
}
/* set USB charger detection timeout to 600ms */
settings = tsu6721_read(TSU6721_REG_TIMER);
settings = (settings & ~0x38);
tsu6721_write(TSU6721_REG_TIMER, settings);
tsu6721_enable_interrupts(TSU6721_INT_ATTACH |
TSU6721_INT_DETACH |
TSU6721_INT_ADC_CHANGE |
TSU6721_INT_VBUS);
}
/*
* TODO(vpalatin): using the I2C early in the HOOK_INIT
* currently triggers all sort of badness, I need to debug
* this before re-activatin this initialization.
*/
#if 0
DECLARE_HOOK(HOOK_INIT, tsu6721_init, HOOK_PRIO_DEFAULT);
#endif
static void tsu6721_dump(void)
{
int i;
uint8_t id = tsu6721_read(TSU6721_REG_ADC);
uint8_t ctrl = tsu6721_read(TSU6721_REG_CONTROL);
if (ctrl & TSU6721_CTRL_AUTO)
ccprintf("Auto: %02x %02x %02x\n",
tsu6721_read(TSU6721_REG_DEV_TYPE1),
tsu6721_read(TSU6721_REG_DEV_TYPE2),
tsu6721_read(TSU6721_REG_DEV_TYPE3));
else
ccprintf("Manual: %02x %02x\n",
tsu6721_read(TSU6721_REG_MANUAL1),
tsu6721_read(TSU6721_REG_MANUAL2));
ccprintf("ID: 0x%02x\n", id);
for (i = 1; i < 0x24; i++)
ccprintf("%02x ", tsu6721_read(i));
ccprintf("\n");
}
/*****************************************************************************/
/* Console commands */
static int command_usbmux(int argc, char **argv)
{
if (1 == argc) { /* dump all registers */
tsu6721_dump();
return EC_SUCCESS;
} else if (2 == argc) {
if (!strcasecmp(argv[1], "usb")) {
tsu6721_mux(TSU6721_MUX_USB);
} else if (!strcasecmp(argv[1], "uart1")) {
tsu6721_mux(TSU6721_MUX_UART);
} else if (!strcasecmp(argv[1], "uart2")) {
tsu6721_mux(TSU6721_MUX_AUDIO);
} else if (!strcasecmp(argv[1], "auto")) {
tsu6721_mux(TSU6721_MUX_NONE);
} else { /* read one register */
ccprintf("Invalid mux value: %s\n", argv[1]);
return EC_ERROR_INVAL;
}
return EC_SUCCESS;
}
return EC_ERROR_INVAL;
}
DECLARE_CONSOLE_COMMAND(usbmux, command_usbmux,
"[usb|uart1|uart2|auto]",
"TSU6721 USB mux control",
NULL);
/*****************************************************************************/
/* Host commands */
static int usb_command_mux(struct host_cmd_handler_args *args)
{
const struct ec_params_usb_mux *p = args->params;
if (system_is_locked())
return EC_RES_ACCESS_DENIED;
/* Safety check */
if (p->mux != TSU6721_MUX_NONE &&
p->mux != TSU6721_MUX_USB &&
p->mux != TSU6721_MUX_UART &&
p->mux != TSU6721_MUX_AUDIO)
return EC_RES_ERROR;
if (tsu6721_mux(p->mux))
return EC_RES_ERROR;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_USB_MUX, usb_command_mux, EC_VER_MASK(0));
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