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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for PMBus devices
*
* Copyright (c) 2010, 2011 Ericsson AB.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include "pmbus.h"
struct pmbus_device_info {
int pages;
u32 flags;
};
static const struct i2c_device_id pmbus_id[];
/*
* Find sensor groups and status registers on each page.
*/
static void pmbus_find_sensor_groups(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int page;
/* Sensors detected on page 0 only */
if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
info->func[0] |= PMBUS_HAVE_VIN;
if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
info->func[0] |= PMBUS_HAVE_VCAP;
if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
info->func[0] |= PMBUS_HAVE_IIN;
if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
info->func[0] |= PMBUS_HAVE_PIN;
if (info->func[0]
&& pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
info->func[0] |= PMBUS_HAVE_FAN12;
if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
}
if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
info->func[0] |= PMBUS_HAVE_FAN34;
if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
}
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
info->func[0] |= PMBUS_HAVE_TEMP;
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
info->func[0] |= PMBUS_HAVE_TEMP2;
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
info->func[0] |= PMBUS_HAVE_TEMP3;
if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
| PMBUS_HAVE_TEMP3)
&& pmbus_check_byte_register(client, 0,
PMBUS_STATUS_TEMPERATURE))
info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
/* Sensors detected on all pages */
for (page = 0; page < info->pages; page++) {
if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
info->func[page] |= PMBUS_HAVE_VOUT;
if (pmbus_check_byte_register(client, page,
PMBUS_STATUS_VOUT))
info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
}
if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
info->func[page] |= PMBUS_HAVE_IOUT;
if (pmbus_check_byte_register(client, 0,
PMBUS_STATUS_IOUT))
info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
}
if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
info->func[page] |= PMBUS_HAVE_POUT;
}
}
/*
* Identify chip parameters.
*/
static int pmbus_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int ret = 0;
if (!info->pages) {
/*
* Check if the PAGE command is supported. If it is,
* keep setting the page number until it fails or until the
* maximum number of pages has been reached. Assume that
* this is the number of pages supported by the chip.
*/
if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
int page;
for (page = 1; page < PMBUS_PAGES; page++) {
if (pmbus_set_page(client, page, 0xff) < 0)
break;
}
pmbus_set_page(client, 0, 0xff);
info->pages = page;
} else {
info->pages = 1;
}
pmbus_clear_faults(client);
}
if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
int vout_mode, i;
vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
if (vout_mode >= 0 && vout_mode != 0xff) {
switch (vout_mode >> 5) {
case 0:
break;
case 1:
info->format[PSC_VOLTAGE_OUT] = vid;
for (i = 0; i < info->pages; i++)
info->vrm_version[i] = vr11;
break;
case 2:
info->format[PSC_VOLTAGE_OUT] = direct;
break;
default:
ret = -ENODEV;
goto abort;
}
}
}
/*
* We should check if the COEFFICIENTS register is supported.
* If it is, and the chip is configured for direct mode, we can read
* the coefficients from the chip, one set per group of sensor
* registers.
*
* To do this, we will need access to a chip which actually supports the
* COEFFICIENTS command, since the command is too complex to implement
* without testing it. Until then, abort if a chip configured for direct
* mode was detected.
*/
if (info->format[PSC_VOLTAGE_OUT] == direct) {
ret = -ENODEV;
goto abort;
}
/* Try to find sensor groups */
pmbus_find_sensor_groups(client, info);
abort:
return ret;
}
static int pmbus_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
struct pmbus_platform_data *pdata = NULL;
struct device *dev = &client->dev;
struct pmbus_device_info *device_info;
info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
device_info = (struct pmbus_device_info *)i2c_match_id(pmbus_id, client)->driver_data;
if (device_info->flags & PMBUS_SKIP_STATUS_CHECK) {
pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->flags = PMBUS_SKIP_STATUS_CHECK;
}
info->pages = device_info->pages;
info->identify = pmbus_identify;
dev->platform_data = pdata;
return pmbus_do_probe(client, info);
}
static const struct pmbus_device_info pmbus_info_one = {
.pages = 1,
.flags = 0
};
static const struct pmbus_device_info pmbus_info_zero = {
.pages = 0,
.flags = 0
};
static const struct pmbus_device_info pmbus_info_one_skip = {
.pages = 1,
.flags = PMBUS_SKIP_STATUS_CHECK
};
/*
* Use driver_data to set the number of pages supported by the chip.
*/
static const struct i2c_device_id pmbus_id[] = {
{"adp4000", (kernel_ulong_t)&pmbus_info_one},
{"bmr453", (kernel_ulong_t)&pmbus_info_one},
{"bmr454", (kernel_ulong_t)&pmbus_info_one},
{"dps460", (kernel_ulong_t)&pmbus_info_one_skip},
{"dps650ab", (kernel_ulong_t)&pmbus_info_one_skip},
{"dps800", (kernel_ulong_t)&pmbus_info_one_skip},
{"max20796", (kernel_ulong_t)&pmbus_info_one},
{"mdt040", (kernel_ulong_t)&pmbus_info_one},
{"ncp4200", (kernel_ulong_t)&pmbus_info_one},
{"ncp4208", (kernel_ulong_t)&pmbus_info_one},
{"pdt003", (kernel_ulong_t)&pmbus_info_one},
{"pdt006", (kernel_ulong_t)&pmbus_info_one},
{"pdt012", (kernel_ulong_t)&pmbus_info_one},
{"pmbus", (kernel_ulong_t)&pmbus_info_zero},
{"sgd009", (kernel_ulong_t)&pmbus_info_one_skip},
{"tps40400", (kernel_ulong_t)&pmbus_info_one},
{"tps544b20", (kernel_ulong_t)&pmbus_info_one},
{"tps544b25", (kernel_ulong_t)&pmbus_info_one},
{"tps544c20", (kernel_ulong_t)&pmbus_info_one},
{"tps544c25", (kernel_ulong_t)&pmbus_info_one},
{"udt020", (kernel_ulong_t)&pmbus_info_one},
{}
};
MODULE_DEVICE_TABLE(i2c, pmbus_id);
/* This is the driver that will be inserted */
static struct i2c_driver pmbus_driver = {
.driver = {
.name = "pmbus",
},
.probe_new = pmbus_probe,
.id_table = pmbus_id,
};
module_i2c_driver(pmbus_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("Generic PMBus driver");
MODULE_LICENSE("GPL");
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