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author | Samuel Mendoza-Jonas <sam@mendozajonas.com> | 2017-05-01 02:39:01 +0200 |
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committer | Guenter Roeck <linux@roeck-us.net> | 2017-06-12 02:08:19 +0200 |
commit | 8991ebd9c9a69dcc03f5a961718a7a3184c1295d (patch) | |
tree | 9d900529a7753b1d2dcdb80dba5a0b5461237515 /drivers/hwmon | |
parent | hwmon: (nct6775) Add support for NCT6795D (diff) | |
download | linux-8991ebd9c9a69dcc03f5a961718a7a3184c1295d.tar.xz linux-8991ebd9c9a69dcc03f5a961718a7a3184c1295d.zip |
hwmon: (pmbus) Add client driver for IR35221
IR35221 is a Digital DC-DC Multiphase Converter
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
[groeck: Preserve alphabetic order in Kconfig;
add missing break statements (from Dan Carpenter);
add missing error checks]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r-- | drivers/hwmon/pmbus/Kconfig | 10 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/Makefile | 1 | ||||
-rw-r--r-- | drivers/hwmon/pmbus/ir35221.c | 337 |
3 files changed, 348 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index cad1229b7e17..68d717a3fd59 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -37,6 +37,16 @@ config SENSORS_ADM1275 This driver can also be built as a module. If so, the module will be called adm1275. +config SENSORS_IR35221 + tristate "Infineon IR35221" + default n + help + If you say yes here you get hardware monitoring support for the + Infineon IR35221 controller. + + This driver can also be built as a module. If so, the module will + be called ir35521. + config SENSORS_LM25066 tristate "National Semiconductor LM25066 and compatibles" default n diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 562132054aaf..75bb7ca619d9 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_PMBUS) += pmbus_core.o obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o +obj-$(CONFIG_SENSORS_IR35221) += ir35221.o obj-$(CONFIG_SENSORS_LM25066) += lm25066.o obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o diff --git a/drivers/hwmon/pmbus/ir35221.c b/drivers/hwmon/pmbus/ir35221.c new file mode 100644 index 000000000000..8b906b44484b --- /dev/null +++ b/drivers/hwmon/pmbus/ir35221.c @@ -0,0 +1,337 @@ +/* + * Hardware monitoring driver for IR35221 + * + * Copyright (C) IBM Corporation 2017. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include "pmbus.h" + +#define IR35221_MFR_VIN_PEAK 0xc5 +#define IR35221_MFR_VOUT_PEAK 0xc6 +#define IR35221_MFR_IOUT_PEAK 0xc7 +#define IR35221_MFR_TEMP_PEAK 0xc8 +#define IR35221_MFR_VIN_VALLEY 0xc9 +#define IR35221_MFR_VOUT_VALLEY 0xca +#define IR35221_MFR_IOUT_VALLEY 0xcb +#define IR35221_MFR_TEMP_VALLEY 0xcc + +static long ir35221_reg2data(int data, enum pmbus_sensor_classes class) +{ + s16 exponent; + s32 mantissa; + long val; + + /* We only modify LINEAR11 formats */ + exponent = ((s16)data) >> 11; + mantissa = ((s16)((data & 0x7ff) << 5)) >> 5; + + val = mantissa * 1000L; + + /* scale result to micro-units for power sensors */ + if (class == PSC_POWER) + val = val * 1000L; + + if (exponent >= 0) + val <<= exponent; + else + val >>= -exponent; + + return val; +} + +#define MAX_MANTISSA (1023 * 1000) +#define MIN_MANTISSA (511 * 1000) + +static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class) +{ + s16 exponent = 0, mantissa; + bool negative = false; + + if (val == 0) + return 0; + + if (val < 0) { + negative = true; + val = -val; + } + + /* Power is in uW. Convert to mW before converting. */ + if (class == PSC_POWER) + val = DIV_ROUND_CLOSEST(val, 1000L); + + /* Reduce large mantissa until it fits into 10 bit */ + while (val >= MAX_MANTISSA && exponent < 15) { + exponent++; + val >>= 1; + } + /* Increase small mantissa to improve precision */ + while (val < MIN_MANTISSA && exponent > -15) { + exponent--; + val <<= 1; + } + + /* Convert mantissa from milli-units to units */ + mantissa = DIV_ROUND_CLOSEST(val, 1000); + + /* Ensure that resulting number is within range */ + if (mantissa > 0x3ff) + mantissa = 0x3ff; + + /* restore sign */ + if (negative) + mantissa = -mantissa; + + /* Convert to 5 bit exponent, 11 bit mantissa */ + return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800); +} + +static u16 ir35221_scale_result(s16 data, int shift, + enum pmbus_sensor_classes class) +{ + long val; + + val = ir35221_reg2data(data, class); + + if (shift < 0) + val >>= -shift; + else + val <<= shift; + + return ir35221_data2reg(val, class); +} + +static int ir35221_read_word_data(struct i2c_client *client, int page, int reg) +{ + int ret; + + switch (reg) { + case PMBUS_IOUT_OC_FAULT_LIMIT: + case PMBUS_IOUT_OC_WARN_LIMIT: + ret = pmbus_read_word_data(client, page, reg); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT); + break; + case PMBUS_VIN_OV_FAULT_LIMIT: + case PMBUS_VIN_OV_WARN_LIMIT: + case PMBUS_VIN_UV_WARN_LIMIT: + ret = pmbus_read_word_data(client, page, reg); + ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN); + break; + case PMBUS_IIN_OC_WARN_LIMIT: + ret = pmbus_read_word_data(client, page, reg); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN); + break; + case PMBUS_READ_VIN: + ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN); + break; + case PMBUS_READ_IIN: + ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN); + if (ret < 0) + break; + if (page == 0) + ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN); + else + ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN); + break; + case PMBUS_READ_POUT: + ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -1, PSC_POWER); + break; + case PMBUS_READ_PIN: + ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -1, PSC_POWER); + break; + case PMBUS_READ_IOUT: + ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT); + if (ret < 0) + break; + if (page == 0) + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT); + else + ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT); + break; + case PMBUS_VIRT_READ_VIN_MAX: + ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN); + break; + case PMBUS_VIRT_READ_VOUT_MAX: + ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK); + break; + case PMBUS_VIRT_READ_IOUT_MAX: + ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK); + if (ret < 0) + break; + if (page == 0) + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN); + else + ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN); + break; + case PMBUS_VIRT_READ_TEMP_MAX: + ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK); + break; + case PMBUS_VIRT_READ_VIN_MIN: + ret = pmbus_read_word_data(client, page, + IR35221_MFR_VIN_VALLEY); + if (ret < 0) + break; + ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN); + break; + case PMBUS_VIRT_READ_VOUT_MIN: + ret = pmbus_read_word_data(client, page, + IR35221_MFR_VOUT_VALLEY); + break; + case PMBUS_VIRT_READ_IOUT_MIN: + ret = pmbus_read_word_data(client, page, + IR35221_MFR_IOUT_VALLEY); + if (ret < 0) + break; + if (page == 0) + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN); + else + ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN); + break; + case PMBUS_VIRT_READ_TEMP_MIN: + ret = pmbus_read_word_data(client, page, + IR35221_MFR_TEMP_VALLEY); + break; + default: + ret = -ENODATA; + break; + } + + return ret; +} + +static int ir35221_write_word_data(struct i2c_client *client, int page, int reg, + u16 word) +{ + int ret; + u16 val; + + switch (reg) { + case PMBUS_IOUT_OC_FAULT_LIMIT: + case PMBUS_IOUT_OC_WARN_LIMIT: + val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT); + ret = pmbus_write_word_data(client, page, reg, val); + break; + case PMBUS_VIN_OV_FAULT_LIMIT: + case PMBUS_VIN_OV_WARN_LIMIT: + case PMBUS_VIN_UV_WARN_LIMIT: + val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN); + ret = pmbus_write_word_data(client, page, reg, val); + break; + case PMBUS_IIN_OC_WARN_LIMIT: + val = ir35221_scale_result(word, 1, PSC_CURRENT_IN); + ret = pmbus_write_word_data(client, page, reg, val); + break; + default: + ret = -ENODATA; + break; + } + + return ret; +} + +static int ir35221_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pmbus_driver_info *info; + u8 buf[I2C_SMBUS_BLOCK_MAX]; + 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(&client->dev, "Failed to read PMBUS_MFR_ID\n"); + return ret; + } + if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) { + dev_err(&client->dev, "MFR_ID unrecognised\n"); + return -ENODEV; + } + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); + if (ret < 0) { + dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n"); + return ret; + } + if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) { + dev_err(&client->dev, "MFR_MODEL unrecognised\n"); + return -ENODEV; + } + + info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->write_word_data = ir35221_write_word_data; + info->read_word_data = ir35221_read_word_data; + + info->pages = 2; + info->format[PSC_VOLTAGE_IN] = linear; + info->format[PSC_VOLTAGE_OUT] = linear; + info->format[PSC_CURRENT_IN] = linear; + info->format[PSC_CURRENT_OUT] = linear; + info->format[PSC_POWER] = linear; + info->format[PSC_TEMPERATURE] = linear; + + info->func[0] = PMBUS_HAVE_VIN + | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN + | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN + | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP + | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT + | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP; + info->func[1] = info->func[0]; + + return pmbus_do_probe(client, id, info); +} + +static const struct i2c_device_id ir35221_id[] = { + {"ir35221", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ir35221_id); + +static struct i2c_driver ir35221_driver = { + .driver = { + .name = "ir35221", + }, + .probe = ir35221_probe, + .remove = pmbus_do_remove, + .id_table = ir35221_id, +}; + +module_i2c_driver(ir35221_driver); + +MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com"); +MODULE_DESCRIPTION("PMBus driver for IR35221"); +MODULE_LICENSE("GPL"); |