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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for PIM4006, PIM4328 and PIM4820
*
* Copyright (c) 2021 Flextronics International Sweden AB
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include <linux/slab.h>
#include "pmbus.h"
enum chips { pim4006, pim4328, pim4820 };
struct pim4328_data {
enum chips id;
struct pmbus_driver_info info;
};
#define to_pim4328_data(x) container_of(x, struct pim4328_data, info)
/* PIM4006 and PIM4328 */
#define PIM4328_MFR_READ_VINA 0xd3
#define PIM4328_MFR_READ_VINB 0xd4
/* PIM4006 */
#define PIM4328_MFR_READ_IINA 0xd6
#define PIM4328_MFR_READ_IINB 0xd7
#define PIM4328_MFR_FET_CHECKSTATUS 0xd9
/* PIM4328 */
#define PIM4328_MFR_STATUS_BITS 0xd5
/* PIM4820 */
#define PIM4328_MFR_READ_STATUS 0xd0
static const struct i2c_device_id pim4328_id[] = {
{"bmr455", pim4328},
{"pim4006", pim4006},
{"pim4106", pim4006},
{"pim4206", pim4006},
{"pim4306", pim4006},
{"pim4328", pim4328},
{"pim4406", pim4006},
{"pim4820", pim4820},
{}
};
MODULE_DEVICE_TABLE(i2c, pim4328_id);
static int pim4328_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
int ret;
if (page > 0)
return -ENXIO;
if (phase == 0xff)
return -ENODATA;
switch (reg) {
case PMBUS_READ_VIN:
ret = pmbus_read_word_data(client, page, phase,
phase == 0 ? PIM4328_MFR_READ_VINA
: PIM4328_MFR_READ_VINB);
break;
case PMBUS_READ_IIN:
ret = pmbus_read_word_data(client, page, phase,
phase == 0 ? PIM4328_MFR_READ_IINA
: PIM4328_MFR_READ_IINB);
break;
default:
ret = -ENODATA;
}
return ret;
}
static int pim4328_read_byte_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct pim4328_data *data = to_pim4328_data(info);
int ret, status;
if (page > 0)
return -ENXIO;
switch (reg) {
case PMBUS_STATUS_BYTE:
ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
if (ret < 0)
return ret;
if (data->id == pim4006) {
status = pmbus_read_word_data(client, page, 0xff,
PIM4328_MFR_FET_CHECKSTATUS);
if (status < 0)
return status;
if (status & 0x0630) /* Input UV */
ret |= PB_STATUS_VIN_UV;
} else if (data->id == pim4328) {
status = pmbus_read_byte_data(client, page,
PIM4328_MFR_STATUS_BITS);
if (status < 0)
return status;
if (status & 0x04) /* Input UV */
ret |= PB_STATUS_VIN_UV;
if (status & 0x40) /* Output UV */
ret |= PB_STATUS_NONE_ABOVE;
} else if (data->id == pim4820) {
status = pmbus_read_byte_data(client, page,
PIM4328_MFR_READ_STATUS);
if (status < 0)
return status;
if (status & 0x05) /* Input OV or OC */
ret |= PB_STATUS_NONE_ABOVE;
if (status & 0x1a) /* Input UV */
ret |= PB_STATUS_VIN_UV;
if (status & 0x40) /* OT */
ret |= PB_STATUS_TEMPERATURE;
}
break;
default:
ret = -ENODATA;
}
return ret;
}
static int pim4328_probe(struct i2c_client *client)
{
int status;
u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
const struct i2c_device_id *mid;
struct pim4328_data *data;
struct pmbus_driver_info *info;
struct pmbus_platform_data *pdata;
struct device *dev = &client->dev;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
| I2C_FUNC_SMBUS_BLOCK_DATA))
return -ENODEV;
data = devm_kzalloc(&client->dev, sizeof(struct pim4328_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
status = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, device_id);
if (status < 0) {
dev_err(&client->dev, "Failed to read Manufacturer Model\n");
return status;
}
for (mid = pim4328_id; mid->name[0]; mid++) {
if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
break;
}
if (!mid->name[0]) {
dev_err(&client->dev, "Unsupported device\n");
return -ENODEV;
}
if (strcmp(client->name, mid->name))
dev_notice(&client->dev,
"Device mismatch: Configured %s, detected %s\n",
client->name, mid->name);
data->id = mid->driver_data;
info = &data->info;
info->pages = 1;
info->read_byte_data = pim4328_read_byte_data;
info->read_word_data = pim4328_read_word_data;
pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
dev->platform_data = pdata;
pdata->flags = PMBUS_NO_CAPABILITY | PMBUS_NO_WRITE_PROTECT;
switch (data->id) {
case pim4006:
info->phases[0] = 2;
info->func[0] = PMBUS_PHASE_VIRTUAL | PMBUS_HAVE_VIN
| PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
info->pfunc[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
info->pfunc[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
break;
case pim4328:
info->phases[0] = 2;
info->func[0] = PMBUS_PHASE_VIRTUAL
| PMBUS_HAVE_VCAP | PMBUS_HAVE_VIN
| PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
info->pfunc[0] = PMBUS_HAVE_VIN;
info->pfunc[1] = PMBUS_HAVE_VIN;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_TEMPERATURE] = direct;
info->format[PSC_CURRENT_OUT] = direct;
pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
break;
case pim4820:
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_TEMP
| PMBUS_HAVE_IIN;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_TEMPERATURE] = direct;
info->format[PSC_CURRENT_IN] = direct;
pdata->flags |= PMBUS_USE_COEFFICIENTS_CMD;
break;
default:
return -ENODEV;
}
return pmbus_do_probe(client, info);
}
static struct i2c_driver pim4328_driver = {
.driver = {
.name = "pim4328",
},
.probe = pim4328_probe,
.id_table = pim4328_id,
};
module_i2c_driver(pim4328_driver);
MODULE_AUTHOR("Erik Rosen <erik.rosen@metormote.com>");
MODULE_DESCRIPTION("PMBus driver for PIM4006, PIM4328, PIM4820 power interface modules");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");
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