314 lines
8.5 KiB
C
314 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Hardware monitoring driver for Maxim MAX16601
|
|
*
|
|
* Implementation notes:
|
|
*
|
|
* Ths chip supports two rails, VCORE and VSA. Telemetry information for the
|
|
* two rails is reported in two subsequent I2C addresses. The driver
|
|
* instantiates a dummy I2C client at the second I2C address to report
|
|
* information for the VSA rail in a single instance of the driver.
|
|
* Telemetry for the VSA rail is reported to the PMBus core in PMBus page 2.
|
|
*
|
|
* The chip reports input current using two separate methods. The input current
|
|
* reported with the standard READ_IIN command is derived from the output
|
|
* current. The first method is reported to the PMBus core with PMBus page 0,
|
|
* the second method is reported with PMBus page 1.
|
|
*
|
|
* The chip supports reading per-phase temperatures and per-phase input/output
|
|
* currents for VCORE. Telemetry is reported in vendor specific registers.
|
|
* The driver translates the vendor specific register values to PMBus standard
|
|
* register values and reports per-phase information in PMBus page 0.
|
|
*
|
|
* Copyright 2019, 2020 Google LLC.
|
|
*/
|
|
|
|
#include <linux/bits.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "pmbus.h"
|
|
|
|
#define REG_SETPT_DVID 0xd1
|
|
#define DAC_10MV_MODE BIT(4)
|
|
#define REG_IOUT_AVG_PK 0xee
|
|
#define REG_IIN_SENSOR 0xf1
|
|
#define REG_TOTAL_INPUT_POWER 0xf2
|
|
#define REG_PHASE_ID 0xf3
|
|
#define CORE_RAIL_INDICATOR BIT(7)
|
|
#define REG_PHASE_REPORTING 0xf4
|
|
|
|
struct max16601_data {
|
|
struct pmbus_driver_info info;
|
|
struct i2c_client *vsa;
|
|
int iout_avg_pkg;
|
|
};
|
|
|
|
#define to_max16601_data(x) container_of(x, struct max16601_data, info)
|
|
|
|
static int max16601_read_byte(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct max16601_data *data = to_max16601_data(info);
|
|
|
|
if (page > 0) {
|
|
if (page == 2) /* VSA */
|
|
return i2c_smbus_read_byte_data(data->vsa, reg);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return -ENODATA;
|
|
}
|
|
|
|
static int max16601_read_word(struct i2c_client *client, int page, int phase,
|
|
int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct max16601_data *data = to_max16601_data(info);
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
|
|
int ret;
|
|
|
|
switch (page) {
|
|
case 0: /* VCORE */
|
|
if (phase == 0xff)
|
|
return -ENODATA;
|
|
switch (reg) {
|
|
case PMBUS_READ_IIN:
|
|
case PMBUS_READ_IOUT:
|
|
case PMBUS_READ_TEMPERATURE_1:
|
|
ret = i2c_smbus_write_byte_data(client, REG_PHASE_ID,
|
|
phase);
|
|
if (ret)
|
|
return ret;
|
|
ret = i2c_smbus_read_block_data(client,
|
|
REG_PHASE_REPORTING,
|
|
buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < 6)
|
|
return -EIO;
|
|
switch (reg) {
|
|
case PMBUS_READ_TEMPERATURE_1:
|
|
return buf[1] << 8 | buf[0];
|
|
case PMBUS_READ_IOUT:
|
|
return buf[3] << 8 | buf[2];
|
|
case PMBUS_READ_IIN:
|
|
return buf[5] << 8 | buf[4];
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return -EOPNOTSUPP;
|
|
case 1: /* VCORE, read IIN/PIN from sensor element */
|
|
switch (reg) {
|
|
case PMBUS_READ_IIN:
|
|
return i2c_smbus_read_word_data(client, REG_IIN_SENSOR);
|
|
case PMBUS_READ_PIN:
|
|
return i2c_smbus_read_word_data(client,
|
|
REG_TOTAL_INPUT_POWER);
|
|
default:
|
|
break;
|
|
}
|
|
return -EOPNOTSUPP;
|
|
case 2: /* VSA */
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
ret = i2c_smbus_read_word_data(data->vsa,
|
|
REG_IOUT_AVG_PK);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (sign_extend32(ret, 10) >
|
|
sign_extend32(data->iout_avg_pkg, 10))
|
|
data->iout_avg_pkg = ret;
|
|
return data->iout_avg_pkg;
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
return 0;
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
case PMBUS_IOUT_OC_WARN_LIMIT:
|
|
case PMBUS_OT_FAULT_LIMIT:
|
|
case PMBUS_OT_WARN_LIMIT:
|
|
case PMBUS_READ_IIN:
|
|
case PMBUS_READ_IOUT:
|
|
case PMBUS_READ_TEMPERATURE_1:
|
|
case PMBUS_STATUS_WORD:
|
|
return i2c_smbus_read_word_data(data->vsa, reg);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
static int max16601_write_byte(struct i2c_client *client, int page, u8 reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct max16601_data *data = to_max16601_data(info);
|
|
|
|
if (page == 2) {
|
|
if (reg == PMBUS_CLEAR_FAULTS)
|
|
return i2c_smbus_write_byte(data->vsa, reg);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return -ENODATA;
|
|
}
|
|
|
|
static int max16601_write_word(struct i2c_client *client, int page, int reg,
|
|
u16 value)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct max16601_data *data = to_max16601_data(info);
|
|
|
|
switch (page) {
|
|
case 0: /* VCORE */
|
|
return -ENODATA;
|
|
case 1: /* VCORE IIN/PIN from sensor element */
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
case 2: /* VSA */
|
|
switch (reg) {
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
data->iout_avg_pkg = 0xfc00;
|
|
return 0;
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
case PMBUS_IOUT_OC_WARN_LIMIT:
|
|
case PMBUS_OT_FAULT_LIMIT:
|
|
case PMBUS_OT_WARN_LIMIT:
|
|
return i2c_smbus_write_word_data(data->vsa, reg, value);
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int max16601_identify(struct i2c_client *client,
|
|
struct pmbus_driver_info *info)
|
|
{
|
|
int reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, REG_SETPT_DVID);
|
|
if (reg < 0)
|
|
return reg;
|
|
if (reg & DAC_10MV_MODE)
|
|
info->vrm_version[0] = vr13;
|
|
else
|
|
info->vrm_version[0] = vr12;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct pmbus_driver_info max16601_info = {
|
|
.pages = 3,
|
|
.format[PSC_VOLTAGE_IN] = linear,
|
|
.format[PSC_VOLTAGE_OUT] = vid,
|
|
.format[PSC_CURRENT_IN] = linear,
|
|
.format[PSC_CURRENT_OUT] = linear,
|
|
.format[PSC_TEMPERATURE] = linear,
|
|
.format[PSC_POWER] = linear,
|
|
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
|
|
PMBUS_HAVE_STATUS_INPUT |
|
|
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
|
PMBUS_HAVE_POUT | PMBUS_PAGE_VIRTUAL | PMBUS_PHASE_VIRTUAL,
|
|
.func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_PAGE_VIRTUAL,
|
|
.func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_PAGE_VIRTUAL,
|
|
.phases[0] = 8,
|
|
.pfunc[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
|
.pfunc[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
|
|
.pfunc[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
|
.pfunc[3] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
|
|
.pfunc[4] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
|
.pfunc[5] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
|
|
.pfunc[6] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
|
|
.pfunc[7] = PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT,
|
|
.identify = max16601_identify,
|
|
.read_byte_data = max16601_read_byte,
|
|
.read_word_data = max16601_read_word,
|
|
.write_byte = max16601_write_byte,
|
|
.write_word_data = max16601_write_word,
|
|
};
|
|
|
|
static void max16601_remove(void *_data)
|
|
{
|
|
struct max16601_data *data = _data;
|
|
|
|
i2c_unregister_device(data->vsa);
|
|
}
|
|
|
|
static int max16601_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
|
|
struct max16601_data *data;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
|
|
if (ret < 0)
|
|
return -ENODEV;
|
|
|
|
/* PMBUS_IC_DEVICE_ID is expected to return "MAX16601y.xx" */
|
|
if (ret < 11 || strncmp(buf, "MAX16601", 8)) {
|
|
buf[ret] = '\0';
|
|
dev_err(dev, "Unsupported chip '%s'\n", buf);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = i2c_smbus_read_byte_data(client, REG_PHASE_ID);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!(ret & CORE_RAIL_INDICATOR)) {
|
|
dev_err(dev,
|
|
"Driver must be instantiated on CORE rail I2C address\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->iout_avg_pkg = 0xfc00;
|
|
data->vsa = i2c_new_dummy_device(client->adapter, client->addr + 1);
|
|
if (IS_ERR(data->vsa)) {
|
|
dev_err(dev, "Failed to register VSA client\n");
|
|
return PTR_ERR(data->vsa);
|
|
}
|
|
ret = devm_add_action_or_reset(dev, max16601_remove, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
data->info = max16601_info;
|
|
|
|
return pmbus_do_probe(client, &data->info);
|
|
}
|
|
|
|
static const struct i2c_device_id max16601_id[] = {
|
|
{"max16601", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, max16601_id);
|
|
|
|
static struct i2c_driver max16601_driver = {
|
|
.driver = {
|
|
.name = "max16601",
|
|
},
|
|
.probe_new = max16601_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = max16601_id,
|
|
};
|
|
|
|
module_i2c_driver(max16601_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("PMBus driver for Maxim MAX16601");
|
|
MODULE_LICENSE("GPL v2");
|