From e10d9e4ca1d9d7b28907c3850828ae214c3adf67 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 18 May 2022 00:35:34 -0700 Subject: [PATCH] hwmon: (pmbus) Add support for Analog Devices LT7182S Add support for Analog Devices LT7182S Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher with Digital Power System Management. Signed-off-by: Guenter Roeck --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/lt7182s.rst | 92 +++++++++++++++ drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/lt7182s.c | 195 ++++++++++++++++++++++++++++++++ 5 files changed, 298 insertions(+) create mode 100644 Documentation/hwmon/lt7182s.rst create mode 100644 drivers/hwmon/pmbus/lt7182s.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index a72c16872ec2..f7113b0f8b2a 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -109,6 +109,7 @@ Hardware Monitoring Kernel Drivers lm95234 lm95245 lochnagar + lt7182s ltc2992 ltc2945 ltc2947 diff --git a/Documentation/hwmon/lt7182s.rst b/Documentation/hwmon/lt7182s.rst new file mode 100644 index 000000000000..f7268311b191 --- /dev/null +++ b/Documentation/hwmon/lt7182s.rst @@ -0,0 +1,92 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver lt7182s +===================== + +Supported chips: + + * ADI LT7182S + + Prefix: 'lt7182s' + + Addresses scanned: - + + Datasheet: https://www.analog.com/en/products/lt7182s.html + +Author: Guenter Roeck + + +Description +----------- + +LT7182S is a Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher with +Digital Power System Management support. + + +Usage Notes +----------- + +This driver does not probe for PMBus devices. You will have to instantiate +devices explicitly. + +Example: the following commands will load the driver for a LT7182S +at address 0x4f on I2C bus #4:: + + # modprobe lt7182s + # echo lt7182s 0x4f > /sys/bus/i2c/devices/i2c-4/new_device + +It can also be instantiated by declaring an entry in device tree. + + +Sysfs attributes +---------------- + +======================= ==================================== +curr[1-2]_label "iin[12]" +curr[1-2]_input Measured input current +curr[1-2]_max Maximum input current +curr[1-2]_max_alarm Current high alarm + +curr[3-4]_label "iout[1-2]" +curr[3-4]_input Measured output current +curr[3-4]_highest Highest measured output current +curr[3-4]_max Maximum output current +curr[3-4]_max_alarm Output current high alarm + +in[1-2]_label "vin[12]" +in[1-2]_input Measured input voltage +in[1-2]_highest Highest measured input voltage +in[1-2]_crit Critical maximum input voltage +in[1-2]_crit_alarm Input voltage critical high alarm +in[1-2]_min Minimum input voltage +in[1-2]_min_alarm Input voltage low alarm +in[1-2]_rated_min Rated minimum input voltage +in[1-2]_rated_max Rated maximum input voltage +in1_reset_history Write to reset history for all attributes + +in[3-5]_label "vmon[1-3]" +in[3-5]_input Measured voltage on ITH1/ITH2/EXTVCC pins + Only available if enabled with MFR_ADC_CONTROL_LT7182S + command. + +in[3-4|6-7]_label "vout[1-2]" +in[3-4|6-7]_input Measured output voltage +in[3-4|6-7]_highest Highest measured output voltage +in[3-4|6-7]_lcrit Critical minimum output voltage +in[3-4|6-7]_lcrit_alarm Output voltage critical low alarm +in[3-4|6-7]_min Minimum output voltage +in[3-4|6-7]_max_alarm Output voltage low alarm +in[3-4|6-7]_max Maximum output voltage +in[3-4|6-7]_max_alarm Output voltage high alarm +in[3-4|6-7]_crit Critical maximum output voltage +in[3-4|6-7]_crit_alarm Output voltage critical high alarm + +power[1-2]_label "pout[1-2]" +power[1-2]_input Measured output power + +temp1_input Measured temperature +temp1_crit Critical high temperature +temp1_crit_alarm Chip temperature critical high alarm +temp1_max Maximum temperature +temp1_max_alarm Chip temperature high alarm +======================= ==================================== diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index dfae76db65ae..951e4a9ff2d6 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -181,6 +181,15 @@ config SENSORS_LM25066_REGULATOR If you say yes here you get regulator support for National Semiconductor LM25066, LM5064, and LM5066. +config SENSORS_LT7182S + tristate "Analog Devices LT7182S" + help + If you say yes here you get hardware monitoring support for Analog + Devices LT7182S. + + This driver can also be built as a module. If so, the module will + be called lt7182s. + config SENSORS_LTC2978 tristate "Linear Technologies LTC2978 and compatibles" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 4678fba5012c..e2fe86f98965 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_SENSORS_IR38064) += ir38064.o obj-$(CONFIG_SENSORS_IRPS5401) += irps5401.o obj-$(CONFIG_SENSORS_ISL68137) += isl68137.o obj-$(CONFIG_SENSORS_LM25066) += lm25066.o +obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o obj-$(CONFIG_SENSORS_MAX15301) += max15301.o diff --git a/drivers/hwmon/pmbus/lt7182s.c b/drivers/hwmon/pmbus/lt7182s.c new file mode 100644 index 000000000000..4cfe476fc92d --- /dev/null +++ b/drivers/hwmon/pmbus/lt7182s.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Hardware monitoring driver for Analog Devices LT7182S + * + * Copyright (c) 2022 Guenter Roeck + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include "pmbus.h" + +#define LT7182S_NUM_PAGES 2 + +#define MFR_READ_EXTVCC 0xcd +#define MFR_READ_ITH 0xce +#define MFR_CONFIG_ALL_LT7182S 0xd1 +#define MFR_IOUT_PEAK 0xd7 +#define MFR_ADC_CONTROL_LT7182S 0xd8 + +#define MFR_DEBUG_TELEMETRY BIT(0) + +#define MFR_VOUT_PEAK 0xdd +#define MFR_VIN_PEAK 0xde +#define MFR_TEMPERATURE_1_PEAK 0xdf +#define MFR_CLEAR_PEAKS 0xe3 + +#define MFR_CONFIG_IEEE BIT(8) + +static int lt7182s_read_word_data(struct i2c_client *client, int page, int phase, int reg) +{ + int ret; + + switch (reg) { + case PMBUS_VIRT_READ_VMON: + if (page == 0 || page == 1) + ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH); + else + ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC); + break; + case PMBUS_VIRT_READ_IOUT_MAX: + ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK); + break; + case PMBUS_VIRT_READ_VOUT_MAX: + ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK); + break; + case PMBUS_VIRT_READ_VIN_MAX: + ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK); + break; + case PMBUS_VIRT_READ_TEMP_MAX: + ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK); + break; + case PMBUS_VIRT_RESET_VIN_HISTORY: + ret = (page == 0) ? 0 : -ENODATA; + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static int lt7182s_write_word_data(struct i2c_client *client, int page, int reg, u16 word) +{ + int ret; + + switch (reg) { + case PMBUS_VIRT_RESET_VIN_HISTORY: + ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS); + break; + default: + ret = -ENODATA; + break; + } + return ret; +} + +static struct pmbus_driver_info lt7182s_info = { + .pages = LT7182S_NUM_PAGES, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = linear, + .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_VOUT | + PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | + PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | + PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | + PMBUS_HAVE_STATUS_INPUT, + .read_word_data = lt7182s_read_word_data, + .write_word_data = lt7182s_write_word_data, +}; + +static int lt7182s_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct pmbus_driver_info *info; + u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA | + I2C_FUNC_SMBUS_READ_WORD_DATA | + I2C_FUNC_SMBUS_READ_BLOCK_DATA)) + return -ENODEV; + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); + if (ret < 0) { + dev_err(dev, "Failed to read PMBUS_MFR_ID\n"); + return ret; + } + if (ret != 3 || strncmp(buf, "ADI", 3)) { + buf[ret] = '\0'; + dev_err(dev, "Manufacturer '%s' not supported\n", buf); + return -ENODEV; + } + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); + if (ret < 0) { + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); + return ret; + } + if (ret != 7 || strncmp(buf, "LT7182S", 7)) { + buf[ret] = '\0'; + dev_err(dev, "Model '%s' not supported\n", buf); + return -ENODEV; + } + + info = devm_kmemdup(dev, <7182s_info, + sizeof(struct pmbus_driver_info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + /* Set data format to IEEE754 if configured */ + ret = i2c_smbus_read_word_data(client, MFR_CONFIG_ALL_LT7182S); + if (ret < 0) + return ret; + if (ret & MFR_CONFIG_IEEE) { + info->format[PSC_VOLTAGE_IN] = ieee754; + info->format[PSC_VOLTAGE_OUT] = ieee754; + info->format[PSC_CURRENT_IN] = ieee754; + info->format[PSC_CURRENT_OUT] = ieee754; + info->format[PSC_TEMPERATURE] = ieee754; + info->format[PSC_POWER] = ieee754; + } + + /* Enable VMON output if configured */ + ret = i2c_smbus_read_byte_data(client, MFR_ADC_CONTROL_LT7182S); + if (ret < 0) + return ret; + if (ret & MFR_DEBUG_TELEMETRY) { + info->pages = 3; + info->func[0] |= PMBUS_HAVE_VMON; + info->func[1] |= PMBUS_HAVE_VMON; + info->func[2] = PMBUS_HAVE_VMON; + } + + return pmbus_do_probe(client, info); +} + +static const struct i2c_device_id lt7182s_id[] = { + { "lt7182s", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, lt7182s_id); + +static const struct of_device_id __maybe_unused lt7182s_of_match[] = { + { .compatible = "adi,lt7182s" }, + {} +}; + +static struct i2c_driver lt7182s_driver = { + .driver = { + .name = "lt7182s", + .of_match_table = of_match_ptr(lt7182s_of_match), + }, + .probe_new = lt7182s_probe, + .id_table = lt7182s_id, +}; + +module_i2c_driver(lt7182s_driver); + +MODULE_AUTHOR("Guenter Roeck "); +MODULE_DESCRIPTION("PMBus driver for Analog Devices LT7182S"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS);