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hwmon: add MP2891 driver

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Add support for MPS VR controller mp2891. This driver exposes
telemetry and limit value readings and writtings.

Signed-off-by: Noah Wang <noahwang.wang@outlook.com>
Link: https://lore.kernel.org/r/SEYPR04MB64828A352836982C0184AA10FAD62@SEYPR04MB6482.apcprd04.prod.outlook.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Noah Wang 2024-06-26 17:46:01 +08:00 committed by Guenter Roeck
parent 45158b93d0
commit 38b2b02236
6 changed files with 797 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/hwmon/index.rst
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@ -165,6 +165,7 @@ Hardware Monitoring Kernel Drivers
mlxreg-fan
mp2856
mp2888
mp2891
mp2975
mp2993
mp5023

179
Documentation/hwmon/mp2891.rst Normal file
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@ -0,0 +1,179 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver mp2891
====================
Supported chips:
* MPS mp2891
Prefix: 'mp2891'
* Datasheet
Publicly available at the MPS website : https://www.monolithicpower.com/en/mp2891.html
Author:
Noah Wang <noahwang.wang@outlook.com>
Description
-----------
This driver implements support for Monolithic Power Systems, Inc. (MPS)
MP2891 Multi-phase Digital VR Controller.
Device compliant with:
- PMBus rev 1.3 interface.
Device supports direct and linear format for reading input voltage,
output voltage, input current, output current, input power, output
power, and temperature.
The driver exports the following attributes via the 'sysfs' files
for input voltage:
**in1_input**
**in1_label**
**in1_crit**
**in1_crit_alarm**
**in1_lcrit**
**in1_lcrit_alarm**
**in1_min**
**in1_min_alarm**
The driver provides the following attributes for output voltage:
**in2_input**
**in2_label**
**in2_crit**
**in2_crit_alarm**
**in2_lcrit**
**in2_lcrit_alarm**
**in2_min**
**in2_min_alarm**
**in3_input**
**in3_label**
**in3_crit**
**in3_crit_alarm**
**in3_lcrit**
**in3_lcrit_alarm**
**in3_min**
**in3_min_alarm**
The driver provides the following attributes for input current:
**curr1_input**
**curr1_label**
**curr1_max**
**curr1_max_alarm**
**curr2_input**
**curr2_label**
**curr2_max**
**curr2_max_alarm**
The driver provides the following attributes for output current:
**curr3_input**
**curr3_label**
**curr3_crit**
**curr3_crit_alarm**
**curr3_max**
**curr3_max_alarm**
**curr4_input**
**curr4_label**
**curr4_crit**
**curr4_crit_alarm**
**curr4_max**
**curr4_max_alarm**
The driver provides the following attributes for input power:
**power1_input**
**power1_label**
**power1_max**
**power1_alarm**
**power2_input**
**power2_label**
**power2_max**
**power2_alarm**
The driver provides the following attributes for output power:
**power3_input**
**power3_label**
**power4_input**
**power4_label**
The driver provides the following attributes for temperature:
**temp1_input**
**temp1_crit**
**temp1_crit_alarm**
**temp1_max**
**temp1_max_alarm**
**temp2_input**
**temp2_crit**
**temp2_crit_alarm**
**temp2_max**
**temp2_max_alarm**

7
MAINTAINERS
View File

@ -15258,6 +15258,13 @@ S: Maintained
F: Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml
F: drivers/video/backlight/mp3309c.c
MPS MP2891 DRIVER
M: Noah Wang <noahwang.wang@outlook.com>
L: linux-hwmon@vger.kernel.org
S: Maintained
F: Documentation/hwmon/mp2891.rst
F: drivers/hwmon/pmbus/mp2891.c
MPS MP2993 DRIVER
M: Noah Wang <noahwang.wang@outlook.com>
L: linux-hwmon@vger.kernel.org

9
drivers/hwmon/pmbus/Kconfig
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@ -337,6 +337,15 @@ config SENSORS_MP2888
This driver can also be built as a module. If so, the module will
be called mp2888.
config SENSORS_MP2891
tristate "MPS MP2891"
help
If you say yes here you get hardware monitoring support for MPS
MP2891 Dual Loop Digital Multi-Phase Controller.
This driver can also be built as a module. If so, the module will
be called mp2891.
config SENSORS_MP2975
tristate "MPS MP2975"
help

1
drivers/hwmon/pmbus/Makefile
View File

@ -36,6 +36,7 @@ obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2856) += mp2856.o
obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2891) += mp2891.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_MP2993) += mp2993.o
obj-$(CONFIG_SENSORS_MP5023) += mp5023.o

600
drivers/hwmon/pmbus/mp2891.c Normal file
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@ -0,0 +1,600 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2891)
*/
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"
/*
* Vender specific registers, the register MFR_SVI3_IOUT_PRT(0x65),
* MFR_VOUT_LOOP_CTRL(0xBD), READ_PIN_EST(0x94)and READ_IIN_EST(0x95)
* redefine the standard PMBUS register. The MFR_SVI3_IOUT_PRT(0x65)
* is used to identify the iout scale and the MFR_VOUT_LOOP_CTRL(0xBD)
* is used to identify the vout scale. The READ_PIN_EST(0x94) is used
* to read input power per rail. The MP2891 does not have standard
* READ_IIN register(0x89), the iin telemetry can be obtained through
* the vendor redefined register READ_IIN_EST(0x95).
*/
#define MFR_VOUT_LOOP_CTRL 0xBD
#define READ_PIN_EST 0x94
#define READ_IIN_EST 0x95
#define MFR_SVI3_IOUT_PRT 0x65
#define MP2891_TEMP_LIMIT_OFFSET 40
#define MP2891_PIN_LIMIT_UINT 2
#define MP2891_IOUT_LIMIT_UINT 8
#define MP2891_IOUT_SCALE_DIV 32
#define MP2891_VOUT_SCALE_DIV 100
#define MP2891_OVUV_DELTA_SCALE 50
#define MP2891_OV_LIMIT_SCALE 20
#define MP2891_UV_LIMIT_SCALE 5
#define MP2891_PAGE_NUM 2
#define MP2891_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP | \
PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | \
PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_STATUS_IOUT | \
PMBUS_HAVE_STATUS_INPUT | \
PMBUS_HAVE_STATUS_TEMP)
#define MP2891_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \
PMBUS_HAVE_TEMP | PMBUS_HAVE_POUT | \
PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | \
PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_STATUS_IOUT | \
PMBUS_HAVE_STATUS_INPUT | \
PMBUS_HAVE_STATUS_TEMP)
struct mp2891_data {
struct pmbus_driver_info info;
int vout_scale[MP2891_PAGE_NUM];
int iout_scale[MP2891_PAGE_NUM];
};
#define to_mp2891_data(x) container_of(x, struct mp2891_data, info)
/* Converts a LINEAR11 value to DIRECT format */
static u16 mp2891_reg2data_linear11(u16 word)
{
s16 exponent;
s32 mantissa;
s64 val;
exponent = ((s16)word) >> 11;
mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
val = mantissa;
if (exponent >= 0)
val <<= exponent;
else
val >>= -exponent;
return val;
}
static int
mp2891_identify_vout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp2891_data *data = to_mp2891_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_VOUT_LOOP_CTRL);
if (ret < 0)
return ret;
/*
* The output voltage is equal to the READ_VOUT(0x8B) register value multiplied
* by vout_scale.
* Obtain vout scale from the register MFR_VOUT_LOOP_CTRL, bits 15-14,bit 13.
* If MFR_VOUT_LOOP_CTRL[13] = 1, the vout scale is below:
* 2.5mV/LSB
* If MFR_VOUT_LOOP_CTRL[13] = 0, the vout scale is decided by
* MFR_VOUT_LOOP_CTRL[15:14]:
* 00b - 6.25mV/LSB, 01b - 5mV/LSB, 10b - 2mV/LSB, 11b - 1mV
*/
if (ret & GENMASK(13, 13)) {
data->vout_scale[page] = 250;
} else {
ret = FIELD_GET(GENMASK(15, 14), ret);
if (ret == 0)
data->vout_scale[page] = 625;
else if (ret == 1)
data->vout_scale[page] = 500;
else if (ret == 2)
data->vout_scale[page] = 200;
else
data->vout_scale[page] = 100;
}
return 0;
}
static int
mp2891_identify_iout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp2891_data *data = to_mp2891_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_SVI3_IOUT_PRT);
if (ret < 0)
return ret;
/*
* The output current is equal to the READ_IOUT(0x8C) register value
* multiplied by iout_scale.
* Obtain iout_scale from the register MFR_SVI3_IOUT_PRT[2:0].
* The value is selected as below:
* 000b - 1A/LSB, 001b - (1/32)A/LSB, 010b - (1/16)A/LSB,
* 011b - (1/8)A/LSB, 100b - (1/4)A/LSB, 101b - (1/2)A/LSB
* 110b - 1A/LSB, 111b - 2A/LSB
*/
switch (ret & GENMASK(2, 0)) {
case 0:
case 6:
data->iout_scale[page] = 32;
break;
case 1:
data->iout_scale[page] = 1;
break;
case 2:
data->iout_scale[page] = 2;
break;
case 3:
data->iout_scale[page] = 4;
break;
case 4:
data->iout_scale[page] = 8;
break;
case 5:
data->iout_scale[page] = 16;
break;
default:
data->iout_scale[page] = 64;
break;
}
return 0;
}
static int mp2891_identify(struct i2c_client *client, struct pmbus_driver_info *info)
{
int ret;
/* Identify vout scale for rail 1. */
ret = mp2891_identify_vout_scale(client, info, 0);
if (ret < 0)
return ret;
/* Identify vout scale for rail 2. */
ret = mp2891_identify_vout_scale(client, info, 1);
if (ret < 0)
return ret;
/* Identify iout scale for rail 1. */
ret = mp2891_identify_iout_scale(client, info, 0);
if (ret < 0)
return ret;
/* Identify iout scale for rail 2. */
return mp2891_identify_iout_scale(client, info, 1);
}
static int mp2891_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret;
switch (reg) {
case PMBUS_VOUT_MODE:
/*
* The MP2891 does not follow standard PMBus protocol completely, the
* PMBUS_VOUT_MODE(0x20) in MP2891 is reserved and 0x00 is always
* returned when the register is read. But the calculation of vout in
* this driver is based on direct format. As a result, the format of
* vout is enforced to direct.
*/
ret = PB_VOUT_MODE_DIRECT;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int mp2891_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp2891_data *data = to_mp2891_data(info);
int ret;
switch (reg) {
case PMBUS_READ_VIN:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = ret & GENMASK(9, 0);
break;
case PMBUS_READ_IIN:
/*
* The MP2891 does not have standard PMBUS_READ_IIN register(0x89),
* the iin telemetry can be obtained through the vender redefined
* register READ_IIN_EST(0x95). The MP2891 PMBUS_READ_IIN register
* is linear11 format, But the pout scale is set to 1A/Lsb(using
* r/m/b scale). As a result, the iin read from MP2891 should be
* calculated to A, then return the result to pmbus core.
*/
ret = pmbus_read_word_data(client, page, phase, READ_IIN_EST);
if (ret < 0)
return ret;
ret = mp2891_reg2data_linear11(ret);
break;
case PMBUS_READ_PIN:
/*
* The MP2891 has standard PMBUS_READ_PIN register(0x97), but this
* is not used to read the input power per rail. The input power
* per rail is read through the vender redefined register
* READ_PIN_EST(0x94). The MP2891 PMBUS_READ_PIN register is linear11
* format, But the pout scale is set to 1W/Lsb(using r/m/b scale).
* As a result, the pin read from MP2891 should be calculated to W,
* then return the result to pmbus core.
*/
ret = pmbus_read_word_data(client, page, phase, READ_PIN_EST);
if (ret < 0)
return ret;
ret = mp2891_reg2data_linear11(ret);
break;
case PMBUS_READ_POUT:
/*
* The MP2891 PMBUS_READ_POUT register is linear11 format, and the
* exponent is not a constant value. But the pout scale is set to
* 1W/Lsb(using r/m/b scale). As a result, the pout read from MP2891
* should be calculated to W, then return the result to pmbus core.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = mp2891_reg2data_linear11(ret);
break;
case PMBUS_READ_VOUT:
case PMBUS_VOUT_UV_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(ret * data->vout_scale[page], MP2891_VOUT_SCALE_DIV);
break;
case PMBUS_READ_IOUT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(10, 0)) * data->iout_scale[page],
MP2891_IOUT_SCALE_DIV);
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The scale of MP2891 PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT
* is 1°C/LSB and they have 40°C offset.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = (ret & GENMASK(7, 0)) - MP2891_TEMP_LIMIT_OFFSET;
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
/*
* The MP2891 PMBUS_VIN_OV_FAULT_LIMIT scale is 125mV/Lsb.
* but the vin scale is set to 31.25mV/Lsb(using r/m/b scale).
* As a result, the limit value should be multiplied by 4.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = (ret & GENMASK(7, 0)) * 4;
break;
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
if (FIELD_GET(GENMASK(11, 8), ret))
ret = FIELD_GET(GENMASK(7, 0), ret) * MP2891_UV_LIMIT_SCALE -
(FIELD_GET(GENMASK(11, 8), ret) + 1) * MP2891_OVUV_DELTA_SCALE;
else
ret = FIELD_GET(GENMASK(7, 0), ret) * MP2891_UV_LIMIT_SCALE;
ret = ret < 0 ? 0 : ret;
break;
case PMBUS_VOUT_OV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
if (FIELD_GET(GENMASK(11, 8), ret))
ret = FIELD_GET(GENMASK(7, 0), ret) * MP2891_OV_LIMIT_SCALE +
(FIELD_GET(GENMASK(11, 8), ret) + 1) * MP2891_OVUV_DELTA_SCALE;
else
ret = FIELD_GET(GENMASK(7, 0), ret) * MP2891_OV_LIMIT_SCALE;
break;
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * data->iout_scale[page] *
MP2891_IOUT_LIMIT_UINT, MP2891_IOUT_SCALE_DIV);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
/*
* The scale of PMBUS_IIN_OC_WARN_LIMIT is 0.5A/Lsb, but the iin scale
* is set to 1A/Lsb(using r/m/b scale), so the word data should be
* divided by 2.
*/
ret = pmbus_read_word_data(client, 0, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)), 2);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
/*
* The scale of PMBUS_PIN_OP_WARN_LIMIT is 2W/Lsb, but the pin scale
* is set to 1W/Lsb(using r/m/b scale), so the word data should be
* multiplied by 2.
*/
ret = pmbus_read_word_data(client, 0, phase, reg);
if (ret < 0)
return ret;
ret = (ret & GENMASK(9, 0)) * MP2891_PIN_LIMIT_UINT;
break;
case PMBUS_READ_TEMPERATURE_1:
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
ret = -ENODATA;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int mp2891_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp2891_data *data = to_mp2891_data(info);
int ret;
switch (reg) {
case PMBUS_VOUT_UV_WARN_LIMIT:
ret = pmbus_write_word_data(client, page, reg,
DIV_ROUND_CLOSEST(word * MP2891_VOUT_SCALE_DIV,
data->vout_scale[page]));
break;
case PMBUS_VOUT_UV_FAULT_LIMIT:
/*
* The PMBUS_VOUT_UV_FAULT_LIMIT[7:0] is the limit value, and bit8-bit15
* should not be changed.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
if (FIELD_GET(GENMASK(11, 8), ret))
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word +
(FIELD_GET(GENMASK(11, 8), ret) + 1) *
MP2891_OVUV_DELTA_SCALE,
MP2891_UV_LIMIT_SCALE)));
else
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word,
MP2891_UV_LIMIT_SCALE)));
break;
case PMBUS_VOUT_OV_FAULT_LIMIT:
/*
* The PMBUS_VOUT_OV_FAULT_LIMIT[7:0] is the limit value, and bit8-bit15
* should not be changed.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
if (FIELD_GET(GENMASK(11, 8), ret))
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word -
(FIELD_GET(GENMASK(11, 8), ret) + 1) *
MP2891_OVUV_DELTA_SCALE,
MP2891_OV_LIMIT_SCALE)));
else
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word,
MP2891_OV_LIMIT_SCALE)));
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
/*
* The PMBUS_VIN_OV_FAULT_LIMIT[7:0] is the limit value, and bit8-bit15
* should not be changed. The scale of PMBUS_VIN_OV_FAULT_LIMIT is 125mV/Lsb,
* but the vin scale is set to 31.25mV/Lsb(using r/m/b scale), so the word data
* should be divided by 4.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word, 4)));
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The scale of MP2891 PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT
* have 40°C offset. The bit0-bit7 is the limit value, and bit8-bit15
* should not be changed.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0), word + MP2891_TEMP_LIMIT_OFFSET));
break;
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
ret = pmbus_write_word_data(client, page, reg,
DIV_ROUND_CLOSEST(word * MP2891_IOUT_SCALE_DIV,
MP2891_IOUT_LIMIT_UINT *
data->iout_scale[page]));
break;
case PMBUS_IIN_OC_WARN_LIMIT:
/*
* The scale of PMBUS_IIN_OC_WARN_LIMIT is 0.5A/Lsb, but the iin scale
* is set to 1A/Lsb(using r/m/b scale), so the word data should be
* multiplied by 2.
*/
ret = pmbus_write_word_data(client, page, reg, word * 2);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
/*
* The scale of PMBUS_PIN_OP_WARN_LIMIT is 2W/Lsb, but the pin scale
* is set to 1W/Lsb(using r/m/b scale), so the word data should be
* divided by 2.
*/
ret = pmbus_write_word_data(client, page, reg,
DIV_ROUND_CLOSEST(word, MP2891_PIN_LIMIT_UINT));
break;
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
ret = -ENODATA;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct pmbus_driver_info mp2891_info = {
.pages = MP2891_PAGE_NUM,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_CURRENT_IN] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_POWER] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
/* set vin scale 31.25mV/Lsb */
.m[PSC_VOLTAGE_IN] = 32,
.R[PSC_VOLTAGE_IN] = 0,
.b[PSC_VOLTAGE_IN] = 0,
/* set temp scale 1000m°C/Lsb */
.m[PSC_TEMPERATURE] = 1,
.R[PSC_TEMPERATURE] = 0,
.b[PSC_TEMPERATURE] = 0,
.m[PSC_CURRENT_IN] = 1,
.R[PSC_CURRENT_IN] = 0,
.b[PSC_CURRENT_IN] = 0,
.m[PSC_CURRENT_OUT] = 1,
.R[PSC_CURRENT_OUT] = 0,
.b[PSC_CURRENT_OUT] = 0,
.m[PSC_POWER] = 1,
.R[PSC_POWER] = 0,
.b[PSC_POWER] = 0,
.m[PSC_VOLTAGE_OUT] = 1,
.R[PSC_VOLTAGE_OUT] = 3,
.b[PSC_VOLTAGE_OUT] = 0,
.func[0] = MP2891_RAIL1_FUNC,
.func[1] = MP2891_RAIL2_FUNC,
.read_word_data = mp2891_read_word_data,
.write_word_data = mp2891_write_word_data,
.read_byte_data = mp2891_read_byte_data,
.identify = mp2891_identify,
};
static int mp2891_probe(struct i2c_client *client)
{
struct mp2891_data *data;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(&data->info, &mp2891_info, sizeof(mp2891_info));
return pmbus_do_probe(client, &data->info);
}
static const struct i2c_device_id mp2891_id[] = {
{"mp2891", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mp2891_id);
static const struct of_device_id __maybe_unused mp2891_of_match[] = {
{.compatible = "mps,mp2891"},
{}
};
MODULE_DEVICE_TABLE(of, mp2891_of_match);
static struct i2c_driver mp2891_driver = {
.driver = {
.name = "mp2891",
.of_match_table = mp2891_of_match,
},
.probe = mp2891_probe,
.id_table = mp2891_id,
};
module_i2c_driver(mp2891_driver);
MODULE_AUTHOR("Noah Wang <noahwang.wang@outlook.com>");
MODULE_DESCRIPTION("PMBus driver for MPS MP2891");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);