| Message ID | 20170501003901.13573-1-sam@mendozajonas.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
On Mon, May 01, 2017 at 10:39:01AM +1000, Samuel Mendoza-Jonas wrote: > IR35221 is a Digital DC-DC Multiphase Converter > > Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> > --- I changed the order in Kconfig to preserve alphabetic order; otherwise looks good. Queued for hwmon-next. The patch just barely missed the commit window. I could have pushed it into v4.12, but I think it deserves some soak time in -next. Thanks, Guenter > v2: Cleaned up includes and some unused reg definitions > > Documentation/hwmon/ir35221 | 87 ++++++++++++ > drivers/hwmon/pmbus/Kconfig | 11 ++ > drivers/hwmon/pmbus/Makefile | 1 + > drivers/hwmon/pmbus/ir35221.c | 313 ++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 412 insertions(+) > create mode 100644 Documentation/hwmon/ir35221 > create mode 100644 drivers/hwmon/pmbus/ir35221.c > > diff --git a/Documentation/hwmon/ir35221 b/Documentation/hwmon/ir35221 > new file mode 100644 > index 000000000000..f7e112752c04 > --- /dev/null > +++ b/Documentation/hwmon/ir35221 > @@ -0,0 +1,87 @@ > +Kernel driver ir35221 > +===================== > + > +Supported chips: > + * Infinion IR35221 > + Prefix: 'ir35221' > + Addresses scanned: - > + Datasheet: Datasheet is not publicly available. > + > +Author: Samuel Mendoza-Jonas <sam@mendozajonas.com> > + > + > +Description > +----------- > + > +IR35221 is a Digital DC-DC Multiphase Converter > + > + > +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 an IR35221 > +at address 0x70 on I2C bus #4: > + > +# modprobe ir35221 > +# echo ir35221 0x70 > /sys/bus/i2c/devices/i2c-4/new_device > + > + > +Sysfs attributes > +---------------- > + > +curr1_label "iin" > +curr1_input Measured input current > +curr1_max Maximum current > +curr1_max_alarm Current high alarm > + > +curr[2-3]_label "iout[1-2]" > +curr[2-3]_input Measured output current > +curr[2-3]_crit Critical maximum current > +curr[2-3]_crit_alarm Current critical high alarm > +curr[2-3]_highest Highest output current > +curr[2-3]_lowest Lowest output current > +curr[2-3]_max Maximum current > +curr[2-3]_max_alarm Current high alarm > + > +in1_label "vin" > +in1_input Measured input voltage > +in1_crit Critical maximum input voltage > +in1_crit_alarm Input voltage critical high alarm > +in1_highest Highest input voltage > +in1_lowest Lowest input voltage > +in1_min Minimum input voltage > +in1_min_alarm Input voltage low alarm > + > +in[2-3]_label "vout[1-2]" > +in[2-3]_input Measured output voltage > +in[2-3]_lcrit Critical minimum output voltage > +in[2-3]_lcrit_alarm Output voltage critical low alarm > +in[2-3]_crit Critical maximum output voltage > +in[2-3]_crit_alarm Output voltage critical high alarm > +in[2-3]_highest Highest output voltage > +in[2-3]_lowest Lowest output voltage > +in[2-3]_max Maximum output voltage > +in[2-3]_max_alarm Output voltage high alarm > +in[2-3]_min Minimum output voltage > +in[2-3]_min_alarm Output voltage low alarm > + > +power1_label "pin" > +power1_input Measured input power > +power1_alarm Input power high alarm > +power1_max Input power limit > + > +power[2-3]_label "pout[1-2]" > +power[2-3]_input Measured output power > +power[2-3]_max Output power limit > +power[2-3]_max_alarm Output power high alarm > + > +temp[1-2]_input Measured temperature > +temp[1-2]_crit Critical high temperature > +temp[1-2]_crit_alarm Chip temperature critical high alarm > +temp[1-2]_highest Highest temperature > +temp[1-2]_lowest Lowest temperature > +temp[1-2]_max Maximum temperature > +temp[1-2]_max_alarm Chip temperature high alarm > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig > index cad1229b7e17..88c7d6b116f8 100644 > --- a/drivers/hwmon/pmbus/Kconfig > +++ b/drivers/hwmon/pmbus/Kconfig > @@ -159,4 +159,15 @@ config SENSORS_ZL6100 > This driver can also be built as a module. If so, the module will > be called zl6100. > > +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. > + > + > endif # PMBUS > 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..cc7b3b542531 > --- /dev/null > +++ b/drivers/hwmon/pmbus/ir35221.c > @@ -0,0 +1,313 @@ > +/* > + * 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); > + 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); > + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN); > + case PMBUS_READ_VIN: > + ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN); > + 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 (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); > + ret = ir35221_scale_result(ret, -1, PSC_POWER); > + break; > + case PMBUS_READ_PIN: > + ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN); > + ret = ir35221_scale_result(ret, -1, PSC_POWER); > + break; > + case PMBUS_READ_IOUT: > + ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT); > + 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); > + 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 (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); > + 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 (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); > + 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"); > -- > 2.12.2 > -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/hwmon/ir35221 b/Documentation/hwmon/ir35221 new file mode 100644 index 000000000000..f7e112752c04 --- /dev/null +++ b/Documentation/hwmon/ir35221 @@ -0,0 +1,87 @@ +Kernel driver ir35221 +===================== + +Supported chips: + * Infinion IR35221 + Prefix: 'ir35221' + Addresses scanned: - + Datasheet: Datasheet is not publicly available. + +Author: Samuel Mendoza-Jonas <sam@mendozajonas.com> + + +Description +----------- + +IR35221 is a Digital DC-DC Multiphase Converter + + +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 an IR35221 +at address 0x70 on I2C bus #4: + +# modprobe ir35221 +# echo ir35221 0x70 > /sys/bus/i2c/devices/i2c-4/new_device + + +Sysfs attributes +---------------- + +curr1_label "iin" +curr1_input Measured input current +curr1_max Maximum current +curr1_max_alarm Current high alarm + +curr[2-3]_label "iout[1-2]" +curr[2-3]_input Measured output current +curr[2-3]_crit Critical maximum current +curr[2-3]_crit_alarm Current critical high alarm +curr[2-3]_highest Highest output current +curr[2-3]_lowest Lowest output current +curr[2-3]_max Maximum current +curr[2-3]_max_alarm Current high alarm + +in1_label "vin" +in1_input Measured input voltage +in1_crit Critical maximum input voltage +in1_crit_alarm Input voltage critical high alarm +in1_highest Highest input voltage +in1_lowest Lowest input voltage +in1_min Minimum input voltage +in1_min_alarm Input voltage low alarm + +in[2-3]_label "vout[1-2]" +in[2-3]_input Measured output voltage +in[2-3]_lcrit Critical minimum output voltage +in[2-3]_lcrit_alarm Output voltage critical low alarm +in[2-3]_crit Critical maximum output voltage +in[2-3]_crit_alarm Output voltage critical high alarm +in[2-3]_highest Highest output voltage +in[2-3]_lowest Lowest output voltage +in[2-3]_max Maximum output voltage +in[2-3]_max_alarm Output voltage high alarm +in[2-3]_min Minimum output voltage +in[2-3]_min_alarm Output voltage low alarm + +power1_label "pin" +power1_input Measured input power +power1_alarm Input power high alarm +power1_max Input power limit + +power[2-3]_label "pout[1-2]" +power[2-3]_input Measured output power +power[2-3]_max Output power limit +power[2-3]_max_alarm Output power high alarm + +temp[1-2]_input Measured temperature +temp[1-2]_crit Critical high temperature +temp[1-2]_crit_alarm Chip temperature critical high alarm +temp[1-2]_highest Highest temperature +temp[1-2]_lowest Lowest temperature +temp[1-2]_max Maximum temperature +temp[1-2]_max_alarm Chip temperature high alarm diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index cad1229b7e17..88c7d6b116f8 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -159,4 +159,15 @@ config SENSORS_ZL6100 This driver can also be built as a module. If so, the module will be called zl6100. +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. + + endif # PMBUS 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..cc7b3b542531 --- /dev/null +++ b/drivers/hwmon/pmbus/ir35221.c @@ -0,0 +1,313 @@ +/* + * 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); + 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); + ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN); + case PMBUS_READ_VIN: + ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN); + 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 (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); + ret = ir35221_scale_result(ret, -1, PSC_POWER); + break; + case PMBUS_READ_PIN: + ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN); + ret = ir35221_scale_result(ret, -1, PSC_POWER); + break; + case PMBUS_READ_IOUT: + ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT); + 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); + 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 (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); + 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 (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); + 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");
IR35221 is a Digital DC-DC Multiphase Converter Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> --- v2: Cleaned up includes and some unused reg definitions Documentation/hwmon/ir35221 | 87 ++++++++++++ drivers/hwmon/pmbus/Kconfig | 11 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/ir35221.c | 313 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 412 insertions(+) create mode 100644 Documentation/hwmon/ir35221 create mode 100644 drivers/hwmon/pmbus/ir35221.c