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/* Copyright 2015 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.
*/
/*
* BD99992GW PMIC temperature sensor module for Chrome EC.
* Note that ADC / temperature sensor registers are only active while
* the PMIC is in S0.
*/
#include "bd99992gw.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "temp_sensor.h"
#include "temp_sensor/thermistor.h"
#include "timer.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_THERMAL, outstr)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)
/* List of active channels, ordered by pointer register */
static enum bd99992gw_adc_channel
active_channels[BD99992GW_ADC_POINTER_REG_COUNT];
/*
* Use 27ms as the period between ADC conversions, as we will typically be
* sampling temperature sensors every second, and 27ms is the longest
* supported period.
*/
#define ADC_LOOP_PERIOD BD99992GW_ADC1CNTL1_SLP27MS
static int raw_read8(const int offset, int *data_ptr)
{
int ret;
ret = i2c_read8(I2C_PORT_THERMAL, BD99992GW_I2C_ADDR_FLAGS,
offset, data_ptr);
if (ret != EC_SUCCESS)
CPRINTS("bd99992gw read fail %d", ret);
return ret;
}
static int raw_write8(const int offset, int data)
{
int ret;
ret = i2c_write8(I2C_PORT_THERMAL, BD99992GW_I2C_ADDR_FLAGS,
offset, data);
if (ret != EC_SUCCESS)
CPRINTS("bd99992gw write fail %d", ret);
return ret;
}
static void bd99992gw_init(void)
{
int i;
int active_channel_count = 0;
uint8_t pointer_reg = BD99992GW_REG_ADC1ADDR0;
/* Mark active channels from the board temp sensor table */
for (i = 0; i < TEMP_SENSOR_COUNT; ++i)
if (temp_sensors[i].read == bd99992gw_get_val)
active_channels[active_channel_count++] =
temp_sensors[i].idx;
/* Make sure we don't have too many active channels. */
ASSERT(active_channel_count <= ARRAY_SIZE(active_channels));
/* Mark the first unused channel so we know where to stop searching */
if (active_channel_count != ARRAY_SIZE(active_channels))
active_channels[active_channel_count] =
BD99992GW_ADC_CHANNEL_NONE;
/* Now write pointer regs with channel to monitor */
for (i = 0; i < active_channel_count; ++i)
/* Write stop bit on last channel */
if (raw_write8(pointer_reg + i, active_channels[i] |
((i == active_channel_count - 1) ?
BD99992GW_ADC1ADDR_STOP : 0)))
return;
/* Enable ADC interrupts */
if (raw_write8(BD99992GW_REG_MADC1INT, 0xf & ~BD99992GW_MADC1INT_RND))
return;
if (raw_write8(BD99992GW_REG_IRQLVL1MSK, BD99992GW_IRQLVL1MSK_MADC))
return;
/* Enable ADC sequencing */
if (raw_write8(BD99992GW_REG_ADC1CNTL2, BD99992GW_ADC1CNTL2_ADCTHERM))
return;
/* Start round-robin conversions at 27ms period */
raw_write8(BD99992GW_REG_ADC1CNTL1, ADC_LOOP_PERIOD |
BD99992GW_ADC1CNTL1_ADEN | BD99992GW_ADC1CNTL1_ADSTRT);
}
/*
* Some regs only work in S0, so we must initialize on AP startup in
* addition to INIT.
*/
DECLARE_HOOK(HOOK_INIT, bd99992gw_init, HOOK_PRIO_DEFAULT);
DECLARE_HOOK(HOOK_CHIPSET_RESUME, bd99992gw_init, HOOK_PRIO_DEFAULT);
/* Convert ADC result to temperature in celsius */
static int bd99992gw_get_temp(uint16_t adc)
{
#ifdef CONFIG_THERMISTOR_NCP15WB
return ncp15wb_calculate_temp(adc);
#else
#error "Unknown thermistor for bd99992gw"
return 0;
#endif
}
/* Get temperature from requested sensor */
int bd99992gw_get_val(int idx, int *temp_ptr)
{
uint16_t adc;
int i, read, ret;
enum bd99992gw_adc_channel channel;
/* ADC unit is only functional in S0 */
if (!chipset_in_state(CHIPSET_STATE_ON))
return EC_ERROR_NOT_POWERED;
/* Find requested channel */
for (i = 0; i < ARRAY_SIZE(active_channels); ++i) {
channel = active_channels[i];
if (channel == idx ||
channel == BD99992GW_ADC_CHANNEL_NONE)
break;
}
/* Make sure we found it */
if (i == ARRAY_SIZE(active_channels) ||
active_channels[i] != idx) {
CPRINTS("Bad ADC channel %d", idx);
return EC_ERROR_INVAL;
}
/* Pause conversions */
ret = raw_write8(0x80,
ADC_LOOP_PERIOD |
BD99992GW_ADC1CNTL1_ADEN |
BD99992GW_ADC1CNTL1_ADSTRT |
BD99992GW_ADC1CNTL1_ADPAUSE);
if (ret)
return ret;
/* Read 10-bit ADC result */
ret = raw_read8(BD99992GW_REG_ADC1DATA0L + 2 * i, &read);
if (ret)
return ret;
adc = read;
ret = raw_read8(BD99992GW_REG_ADC1DATA0H + 2 * i, &read);
if (ret)
return ret;
adc |= read << 2;
/* Convert temperature to C / K */
*temp_ptr = C_TO_K(bd99992gw_get_temp(adc));
/* Clear interrupts */
ret = raw_write8(BD99992GW_REG_ADC1INT, BD99992GW_ADC1INT_RND);
if (ret)
return ret;
ret = raw_write8(BD99992GW_REG_IRQLVL1, BD99992GW_IRQLVL1_ADC);
if (ret)
return ret;
/* Resume conversions */
ret = raw_write8(BD99992GW_REG_ADC1CNTL1, ADC_LOOP_PERIOD |
BD99992GW_ADC1CNTL1_ADEN | BD99992GW_ADC1CNTL1_ADSTRT);
if (ret)
return ret;
return EC_SUCCESS;
}
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