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linux/drivers/hwmon/pmbus/max16601.c
Guenter Roeck 450d1a8ce1 hwmon: (pmbus/max16601) Add support for new revisions of MAX16508 
New revisions of MAX16508 report MAX16508.xx or MAX16508y.xx as device ID,
but are functionally similar to MAX16508. Add support for those chip
variants.

Cc: Vlad Sytchenko <vsytch@google.com>
Cc: Steve Foreman <foremans@google.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2023-06-10 08:28:14 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Hardware monitoring driver for Maxim MAX16508, MAX16600, MAX16601,
* and MAX16602.
*
* Implementation notes:
*
* This chip series 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"
enum chips { max16508, max16600, max16601, max16602 };
#define REG_DEFAULT_NUM_POP 0xc4
#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
#define MAX16601_NUM_PHASES 8
struct max16601_data {
enum chips id;
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)
{
struct max16601_data *data = to_max16601_data(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;
if (data->id != max16600 && data->id != max16601 && data->id != max16602)
return 0;
reg = i2c_smbus_read_byte_data(client, REG_DEFAULT_NUM_POP);
if (reg < 0)
return reg;
/*
* If REG_DEFAULT_NUM_POP returns 0, we don't know how many phases
* are populated. Stick with the default in that case.
*/
reg &= 0x0f;
if (reg && reg <= MAX16601_NUM_PHASES)
info->phases[0] = reg;
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] = MAX16601_NUM_PHASES,
.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 const struct i2c_device_id max16601_id[] = {
{"max16508", max16508},
{"max16600", max16600},
{"max16601", max16601},
{"max16602", max16602},
{}
};
MODULE_DEVICE_TABLE(i2c, max16601_id);
static int max16601_get_id(struct i2c_client *client)
{
struct device *dev = &client->dev;
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
enum chips id;
int ret;
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
if (ret < 0 || ret < 11)
return -ENODEV;
/*
* PMBUS_IC_DEVICE_ID is expected to return MAX1660[012]y.xx",
* "MAX16500y.xx".cdxxcccccccccc, or "MAX16508y.xx".
*/
if (!strncmp(buf, "MAX16500", 8) || !strncmp(buf, "MAX16508", 8)) {
id = max16508;
} else if (!strncmp(buf, "MAX16600", 8)) {
id = max16600;
} else if (!strncmp(buf, "MAX16601", 8)) {
id = max16601;
} else if (!strncmp(buf, "MAX16602", 8)) {
id = max16602;
} else {
buf[ret] = '\0';
dev_err(dev, "Unsupported chip '%s'\n", buf);
return -ENODEV;
}
return id;
}
static int max16601_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
const struct i2c_device_id *id;
struct max16601_data *data;
int ret, chip_id;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA |
I2C_FUNC_SMBUS_READ_BLOCK_DATA))
return -ENODEV;
chip_id = max16601_get_id(client);
if (chip_id < 0)
return chip_id;
id = i2c_match_id(max16601_id, client);
if (chip_id != id->driver_data)
dev_warn(&client->dev,
"Device mismatch: Configured %s (%d), detected %d\n",
id->name, (int) id->driver_data, chip_id);
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->id = chip_id;
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 struct i2c_driver max16601_driver = {
.driver = {
.name = "max16601",
},
.probe = max16601_probe,
.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");
MODULE_IMPORT_NS(PMBUS);
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