diff options
author | Peter Yin <peteryin.openbmc@gmail.com> | 2023-11-13 23:50:08 +0800 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2023-12-11 06:21:00 -0800 |
commit | ce0742404ad7b616811294844dbddac0fb6dcd32 (patch) | |
tree | 6e5775fde814fca14f5138b8a62f6d47ec0c13c8 /drivers/hwmon/pmbus | |
parent | 599617301e54e82c0abdeb55495c4f27924ef716 (diff) |
hwmon: (pmbus) Add support for MPS Multi-phase mp5990
Add support for mp5990 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a Hot-Swap Controller.
Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
Link: https://lore.kernel.org/r/20231113155008.2147090-3-peteryin.openbmc@gmail.com
[groeck: Improved and clarified comments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/pmbus')
-rw-r--r-- | drivers/hwmon/pmbus/Kconfig | 9 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/Makefile | 1 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/mp5990.c | 179 |
3 files changed, 189 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index b4e93bd5835e..17c98fca5bb6 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -333,6 +333,15 @@ config SENSORS_MP5023 This driver can also be built as a module. If so, the module will be called mp5023. +config SENSORS_MP5990 + tristate "MPS MP5990" + help + If you say yes here you get hardware monitoring support for MPS + MP5990. + + This driver can also be built as a module. If so, the module will + be called mp5990. + config SENSORS_MPQ7932_REGULATOR bool "Regulator support for MPQ7932" depends on SENSORS_MPQ7932 && REGULATOR diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 84ee960a6c2d..212d9ca0acc9 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MAX8688) += max8688.o obj-$(CONFIG_SENSORS_MP2888) += mp2888.o obj-$(CONFIG_SENSORS_MP2975) += mp2975.o obj-$(CONFIG_SENSORS_MP5023) += mp5023.o +obj-$(CONFIG_SENSORS_MP5990) += mp5990.o obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o diff --git a/drivers/hwmon/pmbus/mp5990.c b/drivers/hwmon/pmbus/mp5990.c new file mode 100644 index 000000000000..1dfbab25a064 --- /dev/null +++ b/drivers/hwmon/pmbus/mp5990.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for MPS MP5990 Hot-Swap Controller + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include "pmbus.h" + +#define MP5990_EFUSE_CFG (0xC4) +#define MP5990_VOUT_FORMAT BIT(9) + +struct mp5990_data { + struct pmbus_driver_info info; + u8 vout_mode; + u8 vout_linear_exponent; +}; + +#define to_mp5990_data(x) container_of(x, struct mp5990_data, info) + +static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct mp5990_data *data = to_mp5990_data(info); + + switch (reg) { + case PMBUS_VOUT_MODE: + if (data->vout_mode == linear) { + /* + * The VOUT format used by the chip is linear11, + * not linear16. Report that VOUT is in linear mode + * and return exponent value extracted while probing + * the chip. + */ + return data->vout_linear_exponent; + } + + /* + * The datasheet does not support the VOUT command, + * but the device responds with a default value of 0x17. + * In the standard, 0x17 represents linear mode. + * Therefore, we should report that VOUT is in direct + * format when the chip is configured for it. + */ + return PB_VOUT_MODE_DIRECT; + + default: + return -ENODATA; + } +} + +static int mp5990_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 mp5990_data *data = to_mp5990_data(info); + int ret; + s32 mantissa; + + switch (reg) { + case PMBUS_READ_VOUT: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + /* + * Because the VOUT format used by the chip is linear11 and not + * linear16, we disregard bits[15:11]. The exponent is reported + * as part of the VOUT_MODE command. + */ + if (data->vout_mode == linear) { + mantissa = ((s16)((ret & 0x7ff) << 5)) >> 5; + ret = mantissa; + } + break; + default: + return -ENODATA; + } + + return ret; +} + +static struct pmbus_driver_info mp5990_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = direct, + .format[PSC_VOLTAGE_OUT] = direct, + .format[PSC_CURRENT_OUT] = direct, + .format[PSC_POWER] = direct, + .format[PSC_TEMPERATURE] = direct, + .m[PSC_VOLTAGE_IN] = 32, + .b[PSC_VOLTAGE_IN] = 0, + .R[PSC_VOLTAGE_IN] = 0, + .m[PSC_VOLTAGE_OUT] = 32, + .b[PSC_VOLTAGE_OUT] = 0, + .R[PSC_VOLTAGE_OUT] = 0, + .m[PSC_CURRENT_OUT] = 16, + .b[PSC_CURRENT_OUT] = 0, + .R[PSC_CURRENT_OUT] = 0, + .m[PSC_POWER] = 1, + .b[PSC_POWER] = 0, + .R[PSC_POWER] = 0, + .m[PSC_TEMPERATURE] = 1, + .b[PSC_TEMPERATURE] = 0, + .R[PSC_TEMPERATURE] = 0, + .func[0] = + PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN | + PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT | + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .read_byte_data = mp5990_read_byte_data, + .read_word_data = mp5990_read_word_data, +}; + +static int mp5990_probe(struct i2c_client *client) +{ + struct pmbus_driver_info *info; + struct mp5990_data *data; + int ret; + + data = devm_kzalloc(&client->dev, sizeof(struct mp5990_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + memcpy(&data->info, &mp5990_info, sizeof(*info)); + info = &data->info; + + /* Read Vout Config */ + ret = i2c_smbus_read_word_data(client, MP5990_EFUSE_CFG); + if (ret < 0) { + dev_err(&client->dev, "Can't get vout mode."); + return ret; + } + + /* + * EFUSE_CFG (0xC4) bit9=1 is linear mode, bit=0 is direct mode. + */ + if (ret & MP5990_VOUT_FORMAT) { + data->vout_mode = linear; + data->info.format[PSC_VOLTAGE_IN] = linear; + data->info.format[PSC_VOLTAGE_OUT] = linear; + data->info.format[PSC_CURRENT_OUT] = linear; + data->info.format[PSC_POWER] = linear; + ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT); + if (ret < 0) { + dev_err(&client->dev, "Can't get vout exponent."); + return ret; + } + data->vout_linear_exponent = (u8)((ret >> 11) & 0x1f); + } else { + data->vout_mode = direct; + } + return pmbus_do_probe(client, info); +} + +static const struct of_device_id mp5990_of_match[] = { + { .compatible = "mps,mp5990" }, + {} +}; + +static const struct i2c_device_id mp5990_id[] = { + {"mp5990", 0}, + { } +}; +MODULE_DEVICE_TABLE(i2c, mp5990_id); + +static struct i2c_driver mp5990_driver = { + .driver = { + .name = "mp5990", + .of_match_table = mp5990_of_match, + }, + .probe = mp5990_probe, + .id_table = mp5990_id, +}; +module_i2c_driver(mp5990_driver); + +MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>"); +MODULE_DESCRIPTION("PMBus driver for MP5990 HSC"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS); |