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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.
*
* TI INA219/231 Current/Power monitor driver.
*/
#include "console.h"
#include "hooks.h"
#include "i2c.h"
#include "system.h"
#include "timer.h"
#include "ina2xx.h"
#include "util.h"
/* Console output macros */
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
/* 8-bit I2C base address */
#define INA2XX_I2C_ADDR (0x40 << 1)
uint16_t ina2xx_read(uint8_t idx, uint8_t reg)
{
int res;
int val;
uint8_t addr = INA2XX_I2C_ADDR | (idx << 1);
res = i2c_read16(I2C_PORT_MASTER, addr, reg, &val);
if (res) {
CPRINTS("INA2XX I2C read failed");
return 0x0bad;
}
return (val >> 8) | ((val & 0xff) << 8);
}
int ina2xx_write(uint8_t idx, uint8_t reg, uint16_t val)
{
int res;
uint8_t addr = INA2XX_I2C_ADDR | (idx << 1);
uint16_t be_val = (val >> 8) | ((val & 0xff) << 8);
res = i2c_write16(I2C_PORT_MASTER, addr, reg, be_val);
if (res)
CPRINTS("INA2XX I2C write failed");
return res;
}
int ina2xx_init(uint8_t idx, uint16_t config, uint16_t calib)
{
int res;
res = ina2xx_write(idx, INA2XX_REG_CONFIG, config);
/* TODO(crosbug.com/p/29730): assume 1mA/LSB, revisit later */
res |= ina2xx_write(idx, INA2XX_REG_CALIB, calib);
return res;
}
int ina2xx_get_voltage(uint8_t idx)
{
uint16_t bv = ina2xx_read(idx, INA2XX_REG_BUS_VOLT);
return INA2XX_BUS_MV((int)bv);
}
int ina2xx_get_current(uint8_t idx)
{
int16_t curr = ina2xx_read(idx, INA2XX_REG_CURRENT);
/* Current calibration: LSB = 1mA/bit */
return (int)curr;
}
int ina2xx_get_power(uint8_t idx)
{
uint16_t pow = ina2xx_read(idx, INA2XX_REG_POWER);
return INA2XX_POW_MW((int)pow);
}
#ifdef CONFIG_CMD_INA
static void ina2xx_dump(uint8_t idx)
{
uint16_t cfg = ina2xx_read(idx, INA2XX_REG_CONFIG);
int16_t sv = ina2xx_read(idx, INA2XX_REG_SHUNT_VOLT);
uint16_t bv = ina2xx_read(idx, INA2XX_REG_BUS_VOLT);
uint16_t pow = ina2xx_read(idx, INA2XX_REG_POWER);
int16_t curr = ina2xx_read(idx, INA2XX_REG_CURRENT);
uint16_t calib = ina2xx_read(idx, INA2XX_REG_CALIB);
uint16_t mask = ina2xx_read(idx, INA2XX_REG_MASK);
uint16_t alert = ina2xx_read(idx, INA2XX_REG_ALERT);
ccprintf("Configuration: %04x\n", cfg);
ccprintf("Shunt voltage: %04x => %d uV\n", sv,
INA2XX_SHUNT_UV((int)sv));
ccprintf("Bus voltage : %04x => %d mV\n", bv,
INA2XX_BUS_MV((int)bv));
ccprintf("Power : %04x => %d mW\n", pow,
INA2XX_POW_MW((int)pow));
ccprintf("Current : %04x => %d mA\n", curr, curr);
ccprintf("Calibration : %04x\n", calib);
ccprintf("Mask/Enable : %04x\n", mask);
ccprintf("Alert limit : %04x\n", alert);
}
/*****************************************************************************/
/* Console commands */
static int command_ina(int argc, char **argv)
{
char *e;
int idx;
uint16_t val;
if (argc < 2)
return EC_ERROR_PARAM_COUNT;
idx = strtoi(argv[1], &e, 10);
if (*e)
return EC_ERROR_PARAM1;
if (2 == argc) { /* dump all registers */
ina2xx_dump(idx);
return EC_SUCCESS;
} else if (4 == argc) {
val = strtoi(argv[3], &e, 16);
if (*e)
return EC_ERROR_PARAM3;
if (!strcasecmp(argv[2], "config")) {
ina2xx_write(idx, INA2XX_REG_CONFIG, val);
} else if (!strcasecmp(argv[2], "calib")) {
ina2xx_write(idx, INA2XX_REG_CALIB, val);
} else if (!strcasecmp(argv[2], "mask")) {
ina2xx_write(idx, INA2XX_REG_MASK, val);
} else if (!strcasecmp(argv[2], "alert")) {
ina2xx_write(idx, INA2XX_REG_ALERT, val);
} else { /* read one register */
ccprintf("Invalid register: %s\n", argv[1]);
return EC_ERROR_INVAL;
}
return EC_SUCCESS;
}
return EC_ERROR_INVAL;
}
DECLARE_CONSOLE_COMMAND(ina, command_ina,
"<index> [config|calib|mask|alert <val>]",
"INA2XX power/current sensing");
#endif
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