| Message ID | 20201203071155.68859-2-alexandru.tachici@analog.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | hwmon: ltc2992: Add support | expand |
On Thu, Dec 03, 2020 at 09:11:53AM +0200, alexandru.tachici@analog.com wrote: > From: Alexandru Tachici <alexandru.tachici@analog.com> > > LTC2992 is a rail-to-rail system monitor that > measures current, voltage, and power of two supplies. > > Two ADCs simultaneously measure each supply’s current. > A third ADC monitors the input voltages and four > auxiliary external voltages. > > Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com> Applied. Thanks, Guenter > --- > Documentation/hwmon/index.rst | 1 + > Documentation/hwmon/ltc2992.rst | 56 +++ > drivers/hwmon/Kconfig | 11 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/ltc2992.c | 813 ++++++++++++++++++++++++++++++++ > 5 files changed, 882 insertions(+) > create mode 100644 Documentation/hwmon/ltc2992.rst > create mode 100644 drivers/hwmon/ltc2992.c > > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst > index e6b91ab12978..98575a8b1918 100644 > --- a/Documentation/hwmon/index.rst > +++ b/Documentation/hwmon/index.rst > @@ -100,6 +100,7 @@ Hardware Monitoring Kernel Drivers > lm95234 > lm95245 > lochnagar > + ltc2992 > ltc2945 > ltc2947 > ltc2978 > diff --git a/Documentation/hwmon/ltc2992.rst b/Documentation/hwmon/ltc2992.rst > new file mode 100644 > index 000000000000..46aa1aa84a1a > --- /dev/null > +++ b/Documentation/hwmon/ltc2992.rst > @@ -0,0 +1,56 @@ > +.. SPDX-License-Identifier: GPL-2.0 > + > +Kernel driver ltc2992 > +===================== > + > +Supported chips: > + * Linear Technology LTC2992 > + Prefix: 'ltc2992' > + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2992.pdf > + > +Author: Alexandru Tachici <alexandru.tachici@analog.com> > + > + > +Description > +----------- > + > +This driver supports hardware monitoring for Linear Technology LTC2992 power monitor. > + > +LTC2992 is a rail-to-rail system monitor that measures current, > +voltage, and power of two supplies. > + > +Two ADCs simultaneously measure each supply’s current. A third ADC monitors > +the input voltages and four auxiliary external voltages. > + > + > +Sysfs entries > +------------- > + > +The following attributes are supported. Limits are read-write, > +all other attributes are read-only. > + > +in_reset_history Reset all highest/lowest values. > + > +inX_input Measured voltage. > +inX_lowest Minimum measured voltage. > +inX_highest Maximum measured voltage. > +inX_min Minimum voltage allowed. > +inX_max Maximum voltage allowed. > +inX_min_alarm An undervoltage occurred. Cleared on read. > +inX_max_alarm An overvoltage occurred. Cleared on read. > + > +currX_input Measured current. > +currX_lowest Minimum measured current. > +currX_highest Maximum measured current. > +currX_min Minimum current allowed. > +currX_max Maximum current allowed. > +currX_min_alarm An undercurrent occurred. Cleared on read. > +currX_max_alarm An overcurrent occurred. Cleared on read. > + > +powerX_input Measured power. > +powerX_input_lowest Minimum measured voltage. > +powerX_input_highest Maximum measured voltage. > +powerX_min Minimum power. > +powerX_max Maximum power. > +powerX_min_alarm An underpower occurred. Cleared on read. > +powerX_max_alarm An overpower occurred. Cleared on read. > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index a850e4f0e0bd..bf9e387270d6 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -858,6 +858,17 @@ config SENSORS_LTC2990 > This driver can also be built as a module. If so, the module will > be called ltc2990. > > +config SENSORS_LTC2992 > + tristate "Linear Technology LTC2992" > + depends on I2C > + help > + If you say yes here you get support for Linear Technology LTC2992 > + I2C System Monitor. The LTC2992 measures current, voltage, and > + power of two supplies. > + > + This driver can also be built as a module. If so, the module will > + be called ltc2992. > + > config SENSORS_LTC4151 > tristate "Linear Technology LTC4151" > depends on I2C > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile > index 9db2903b61e5..d6172c4807c4 100644 > --- a/drivers/hwmon/Makefile > +++ b/drivers/hwmon/Makefile > @@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_LTC2947) += ltc2947-core.o > obj-$(CONFIG_SENSORS_LTC2947_I2C) += ltc2947-i2c.o > obj-$(CONFIG_SENSORS_LTC2947_SPI) += ltc2947-spi.o > obj-$(CONFIG_SENSORS_LTC2990) += ltc2990.o > +obj-$(CONFIG_SENSORS_LTC2992) += ltc2992.o > obj-$(CONFIG_SENSORS_LTC4151) += ltc4151.o > obj-$(CONFIG_SENSORS_LTC4215) += ltc4215.o > obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o > diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c > new file mode 100644 > index 000000000000..c11d585a9600 > --- /dev/null > +++ b/drivers/hwmon/ltc2992.c > @@ -0,0 +1,813 @@ > +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +/* > + * LTC2992 - Dual Wide Range Power Monitor > + * > + * Copyright 2020 Analog Devices Inc. > + */ > + > +#include <linux/bitfield.h> > +#include <linux/bitops.h> > +#include <linux/err.h> > +#include <linux/hwmon.h> > +#include <linux/i2c.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > + > +#define LTC2992_CTRLB 0x01 > +#define LTC2992_FAULT1 0x03 > +#define LTC2992_POWER1 0x05 > +#define LTC2992_POWER1_MAX 0x08 > +#define LTC2992_POWER1_MIN 0x0B > +#define LTC2992_POWER1_MAX_THRESH 0x0E > +#define LTC2992_POWER1_MIN_THRESH 0x11 > +#define LTC2992_DSENSE1 0x14 > +#define LTC2992_DSENSE1_MAX 0x16 > +#define LTC2992_DSENSE1_MIN 0x18 > +#define LTC2992_DSENSE1_MAX_THRESH 0x1A > +#define LTC2992_DSENSE1_MIN_THRESH 0x1C > +#define LTC2992_SENSE1 0x1E > +#define LTC2992_SENSE1_MAX 0x20 > +#define LTC2992_SENSE1_MIN 0x22 > +#define LTC2992_SENSE1_MAX_THRESH 0x24 > +#define LTC2992_SENSE1_MIN_THRESH 0x26 > +#define LTC2992_G1 0x28 > +#define LTC2992_G1_MAX 0x2A > +#define LTC2992_G1_MIN 0x2C > +#define LTC2992_G1_MAX_THRESH 0x2E > +#define LTC2992_G1_MIN_THRESH 0x30 > +#define LTC2992_FAULT2 0x35 > +#define LTC2992_G2 0x5A > +#define LTC2992_G2_MAX 0x5C > +#define LTC2992_G2_MIN 0x5E > +#define LTC2992_G2_MAX_THRESH 0x60 > +#define LTC2992_G2_MIN_THRESH 0x62 > +#define LTC2992_G3 0x64 > +#define LTC2992_G3_MAX 0x66 > +#define LTC2992_G3_MIN 0x68 > +#define LTC2992_G3_MAX_THRESH 0x6A > +#define LTC2992_G3_MIN_THRESH 0x6C > +#define LTC2992_G4 0x6E > +#define LTC2992_G4_MAX 0x70 > +#define LTC2992_G4_MIN 0x72 > +#define LTC2992_G4_MAX_THRESH 0x74 > +#define LTC2992_G4_MIN_THRESH 0x76 > +#define LTC2992_FAULT3 0x92 > + > +#define LTC2992_POWER(x) (LTC2992_POWER1 + ((x) * 0x32)) > +#define LTC2992_POWER_MAX(x) (LTC2992_POWER1_MAX + ((x) * 0x32)) > +#define LTC2992_POWER_MIN(x) (LTC2992_POWER1_MIN + ((x) * 0x32)) > +#define LTC2992_POWER_MAX_THRESH(x) (LTC2992_POWER1_MAX_THRESH + ((x) * 0x32)) > +#define LTC2992_POWER_MIN_THRESH(x) (LTC2992_POWER1_MIN_THRESH + ((x) * 0x32)) > +#define LTC2992_DSENSE(x) (LTC2992_DSENSE1 + ((x) * 0x32)) > +#define LTC2992_DSENSE_MAX(x) (LTC2992_DSENSE1_MAX + ((x) * 0x32)) > +#define LTC2992_DSENSE_MIN(x) (LTC2992_DSENSE1_MIN + ((x) * 0x32)) > +#define LTC2992_DSENSE_MAX_THRESH(x) (LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32)) > +#define LTC2992_DSENSE_MIN_THRESH(x) (LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32)) > +#define LTC2992_SENSE(x) (LTC2992_SENSE1 + ((x) * 0x32)) > +#define LTC2992_SENSE_MAX(x) (LTC2992_SENSE1_MAX + ((x) * 0x32)) > +#define LTC2992_SENSE_MIN(x) (LTC2992_SENSE1_MIN + ((x) * 0x32)) > +#define LTC2992_SENSE_MAX_THRESH(x) (LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32)) > +#define LTC2992_SENSE_MIN_THRESH(x) (LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32)) > +#define LTC2992_POWER_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) > +#define LTC2992_SENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) > +#define LTC2992_DSENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) > + > +/* CTRLB register bitfields */ > +#define LTC2992_RESET_HISTORY BIT(3) > + > +/* FAULT1 FAULT2 registers common bitfields */ > +#define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x)) > +#define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x)) > +#define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x)) > + > +/* FAULT1 bitfields */ > +#define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x)) > + > +/* FAULT2 bitfields */ > +#define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x)) > + > +/* FAULT3 bitfields */ > +#define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x)) > +#define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x)) > + > +#define LTC2992_IADC_NANOV_LSB 12500 > +#define LTC2992_VADC_UV_LSB 25000 > +#define LTC2992_VADC_GPIO_UV_LSB 500 > + > +struct ltc2992_state { > + struct i2c_client *client; > + struct regmap *regmap; > + u32 r_sense_uohm[2]; > +}; > + > +struct ltc2992_gpio_regs { > + u8 data; > + u8 max; > + u8 min; > + u8 max_thresh; > + u8 min_thresh; > + u8 alarm; > + u8 min_alarm_msk; > + u8 max_alarm_msk; > +}; > + > +static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = { > + { > + .data = LTC2992_G1, > + .max = LTC2992_G1_MAX, > + .min = LTC2992_G1_MIN, > + .max_thresh = LTC2992_G1_MAX_THRESH, > + .min_thresh = LTC2992_G1_MIN_THRESH, > + .alarm = LTC2992_FAULT1, > + .min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0), > + .max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1), > + }, > + { > + .data = LTC2992_G2, > + .max = LTC2992_G2_MAX, > + .min = LTC2992_G2_MIN, > + .max_thresh = LTC2992_G2_MAX_THRESH, > + .min_thresh = LTC2992_G2_MIN_THRESH, > + .alarm = LTC2992_FAULT2, > + .min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0), > + .max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1), > + }, > + { > + .data = LTC2992_G3, > + .max = LTC2992_G3_MAX, > + .min = LTC2992_G3_MIN, > + .max_thresh = LTC2992_G3_MAX_THRESH, > + .min_thresh = LTC2992_G3_MIN_THRESH, > + .alarm = LTC2992_FAULT3, > + .min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0), > + .max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1), > + }, > + { > + .data = LTC2992_G4, > + .max = LTC2992_G4_MAX, > + .min = LTC2992_G4_MIN, > + .max_thresh = LTC2992_G4_MAX_THRESH, > + .min_thresh = LTC2992_G4_MIN_THRESH, > + .alarm = LTC2992_FAULT3, > + .min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0), > + .max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1), > + }, > +}; > + > +static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len) > +{ > + u8 regvals[4]; > + int ret; > + int val; > + int i; > + > + ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len); > + if (ret < 0) > + return ret; > + > + val = 0; > + for (i = 0; i < reg_len; i++) > + val |= regvals[reg_len - i - 1] << (i * 8); > + > + return val; > +} > + > +static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val) > +{ > + u8 regvals[4]; > + int i; > + > + for (i = 0; i < reg_len; i++) > + regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF; > + > + return regmap_bulk_write(st->regmap, addr, regvals, reg_len); > +} > + > +static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, > + int channel) > +{ > + const struct ltc2992_state *st = data; > + > + switch (type) { > + case hwmon_chip: > + switch (attr) { > + case hwmon_chip_in_reset_history: > + return 0200; > + } > + break; > + case hwmon_in: > + switch (attr) { > + case hwmon_in_input: > + case hwmon_in_lowest: > + case hwmon_in_highest: > + case hwmon_in_min_alarm: > + case hwmon_in_max_alarm: > + return 0444; > + case hwmon_in_min: > + case hwmon_in_max: > + return 0644; > + } > + break; > + case hwmon_curr: > + switch (attr) { > + case hwmon_curr_input: > + case hwmon_curr_lowest: > + case hwmon_curr_highest: > + case hwmon_curr_min_alarm: > + case hwmon_curr_max_alarm: > + if (st->r_sense_uohm[channel]) > + return 0444; > + break; > + case hwmon_curr_min: > + case hwmon_curr_max: > + if (st->r_sense_uohm[channel]) > + return 0644; > + break; > + } > + break; > + case hwmon_power: > + switch (attr) { > + case hwmon_power_input: > + case hwmon_power_input_lowest: > + case hwmon_power_input_highest: > + case hwmon_power_min_alarm: > + case hwmon_power_max_alarm: > + if (st->r_sense_uohm[channel]) > + return 0444; > + break; > + case hwmon_power_min: > + case hwmon_power_max: > + if (st->r_sense_uohm[channel]) > + return 0644; > + break; > + } > + break; > + default: > + break; > + } > + > + return 0; > +} > + > +static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val) > +{ > + int reg_val; > + > + reg_val = ltc2992_read_reg(st, reg, 2); > + if (reg_val < 0) > + return reg_val; > + > + reg_val = reg_val >> 4; > + *val = DIV_ROUND_CLOSEST(reg_val * scale, 1000); > + > + return 0; > +} > + > +static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val) > +{ > + val = DIV_ROUND_CLOSEST(val * 1000, scale); > + val = val << 4; > + > + return ltc2992_write_reg(st, reg, 2, val); > +} > + > +static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, u32 attr, long *val) > +{ > + int reg_val; > + u32 mask; > + > + if (attr == hwmon_in_max_alarm) > + mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk; > + else > + mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk; > + > + reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1); > + if (reg_val < 0) > + return reg_val; > + > + *val = !!(reg_val & mask); > + reg_val &= ~mask; > + > + return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val); > +} > + > +static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_in_input: > + reg = ltc2992_gpio_addr_map[nr_gpio].data; > + break; > + case hwmon_in_lowest: > + reg = ltc2992_gpio_addr_map[nr_gpio].min; > + break; > + case hwmon_in_highest: > + reg = ltc2992_gpio_addr_map[nr_gpio].max; > + break; > + case hwmon_in_min: > + reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; > + break; > + case hwmon_in_max: > + reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; > + break; > + case hwmon_in_min_alarm: > + case hwmon_in_max_alarm: > + return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val); > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); > +} > + > +static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) > +{ > + u32 reg_val; > + u32 mask; > + > + if (attr == hwmon_in_max_alarm) > + mask = LTC2992_SENSE_FAULT_MSK(1); > + else > + mask = LTC2992_SENSE_FAULT_MSK(0); > + > + reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1); > + if (reg_val < 0) > + return reg_val; > + > + *val = !!(reg_val & mask); > + reg_val &= ~mask; > + > + return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val); > +} > + > +static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + if (channel > 1) > + return ltc2992_read_gpios_in(dev, attr, channel - 2, val); > + > + switch (attr) { > + case hwmon_in_input: > + reg = LTC2992_SENSE(channel); > + break; > + case hwmon_in_lowest: > + reg = LTC2992_SENSE_MIN(channel); > + break; > + case hwmon_in_highest: > + reg = LTC2992_SENSE_MAX(channel); > + break; > + case hwmon_in_min: > + reg = LTC2992_SENSE_MIN_THRESH(channel); > + break; > + case hwmon_in_max: > + reg = LTC2992_SENSE_MAX_THRESH(channel); > + break; > + case hwmon_in_min_alarm: > + case hwmon_in_max_alarm: > + return ltc2992_read_in_alarm(st, channel, val, attr); > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val); > +} > + > +static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val) > +{ > + u32 reg_val; > + > + reg_val = ltc2992_read_reg(st, reg, 2); > + if (reg_val < 0) > + return reg_val; > + > + reg_val = reg_val >> 4; > + *val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]); > + > + return 0; > +} > + > +static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val) > +{ > + u32 reg_val; > + > + reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB); > + reg_val = reg_val << 4; > + > + return ltc2992_write_reg(st, reg, 2, reg_val); > +} > + > +static int ltc2992_read_curr_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) > +{ > + u32 reg_val; > + u32 mask; > + > + if (attr == hwmon_curr_max_alarm) > + mask = LTC2992_DSENSE_FAULT_MSK(1); > + else > + mask = LTC2992_DSENSE_FAULT_MSK(0); > + > + reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1); > + if (reg_val < 0) > + return reg_val; > + > + *val = !!(reg_val & mask); > + > + reg_val &= ~mask; > + return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val); > +} > + > +static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_curr_input: > + reg = LTC2992_DSENSE(channel); > + break; > + case hwmon_curr_lowest: > + reg = LTC2992_DSENSE_MIN(channel); > + break; > + case hwmon_curr_highest: > + reg = LTC2992_DSENSE_MAX(channel); > + break; > + case hwmon_curr_min: > + reg = LTC2992_DSENSE_MIN_THRESH(channel); > + break; > + case hwmon_curr_max: > + reg = LTC2992_DSENSE_MAX_THRESH(channel); > + break; > + case hwmon_curr_min_alarm: > + case hwmon_curr_max_alarm: > + return ltc2992_read_curr_alarm(st, channel, val, attr); > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_get_current(st, reg, channel, val); > +} > + > +static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val) > +{ > + u32 reg_val; > + > + reg_val = ltc2992_read_reg(st, reg, 3); > + if (reg_val < 0) > + return reg_val; > + > + *val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB, > + st->r_sense_uohm[channel] * 1000); > + > + return 0; > +} > + > +static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val) > +{ > + u32 reg_val; > + > + reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000, > + LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB); > + > + return ltc2992_write_reg(st, reg, 3, reg_val); > +} > + > +static int ltc2992_read_power_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) > +{ > + u32 reg_val; > + u32 mask; > + > + if (attr == hwmon_power_max_alarm) > + mask = LTC2992_POWER_FAULT_MSK(1); > + else > + mask = LTC2992_POWER_FAULT_MSK(0); > + > + reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1); > + if (reg_val < 0) > + return reg_val; > + > + *val = !!(reg_val & mask); > + reg_val &= ~mask; > + > + return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val); > +} > + > +static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_power_input: > + reg = LTC2992_POWER(channel); > + break; > + case hwmon_power_input_lowest: > + reg = LTC2992_POWER_MIN(channel); > + break; > + case hwmon_power_input_highest: > + reg = LTC2992_POWER_MAX(channel); > + break; > + case hwmon_power_min: > + reg = LTC2992_POWER_MIN_THRESH(channel); > + break; > + case hwmon_power_max: > + reg = LTC2992_POWER_MAX_THRESH(channel); > + break; > + case hwmon_power_min_alarm: > + case hwmon_power_max_alarm: > + return ltc2992_read_power_alarm(st, channel, val, attr); > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_get_power(st, reg, channel, val); > +} > + > +static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, > + long *val) > +{ > + switch (type) { > + case hwmon_in: > + return ltc2992_read_in(dev, attr, channel, val); > + case hwmon_curr: > + return ltc2992_read_curr(dev, attr, channel, val); > + case hwmon_power: > + return ltc2992_read_power(dev, attr, channel, val); > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_curr_min: > + reg = LTC2992_DSENSE_MIN_THRESH(channel); > + break; > + case hwmon_curr_max: > + reg = LTC2992_DSENSE_MAX_THRESH(channel); > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_set_current(st, reg, channel, val); > +} > + > +static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_in_min: > + reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; > + break; > + case hwmon_in_max: > + reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); > +} > + > +static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + if (channel > 1) > + return ltc2992_write_gpios_in(dev, attr, channel - 2, val); > + > + switch (attr) { > + case hwmon_in_min: > + reg = LTC2992_SENSE_MIN_THRESH(channel); > + break; > + case hwmon_in_max: > + reg = LTC2992_SENSE_MAX_THRESH(channel); > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val); > +} > + > +static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + u32 reg; > + > + switch (attr) { > + case hwmon_power_min: > + reg = LTC2992_POWER_MIN_THRESH(channel); > + break; > + case hwmon_power_max: > + reg = LTC2992_POWER_MAX_THRESH(channel); > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return ltc2992_set_power(st, reg, channel, val); > +} > + > +static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val) > +{ > + struct ltc2992_state *st = dev_get_drvdata(dev); > + > + switch (attr) { > + case hwmon_chip_in_reset_history: > + return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY, > + LTC2992_RESET_HISTORY); > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, > + long val) > +{ > + switch (type) { > + case hwmon_chip: > + return ltc2992_write_chip(dev, attr, channel, val); > + case hwmon_in: > + return ltc2992_write_in(dev, attr, channel, val); > + case hwmon_curr: > + return ltc2992_write_curr(dev, attr, channel, val); > + case hwmon_power: > + return ltc2992_write_power(dev, attr, channel, val); > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static const struct hwmon_ops ltc2992_hwmon_ops = { > + .is_visible = ltc2992_is_visible, > + .read = ltc2992_read, > + .write = ltc2992_write, > +}; > + > +static const u32 ltc2992_chip_config[] = { > + HWMON_C_IN_RESET_HISTORY, > + 0 > +}; > + > +static const struct hwmon_channel_info ltc2992_chip = { > + .type = hwmon_chip, > + .config = ltc2992_chip_config, > +}; > + > +static const u32 ltc2992_in_config[] = { > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | > + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, > + 0 > +}; > + > +static const struct hwmon_channel_info ltc2992_in = { > + .type = hwmon_in, > + .config = ltc2992_in_config, > +}; > + > +static const u32 ltc2992_curr_config[] = { > + HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | HWMON_C_MAX | > + HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM, > + HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | HWMON_C_MAX | > + HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM, > + 0 > +}; > + > +static const struct hwmon_channel_info ltc2992_curr = { > + .type = hwmon_curr, > + .config = ltc2992_curr_config, > +}; > + > +static const u32 ltc2992_power_config[] = { > + HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | HWMON_P_MIN | HWMON_P_MAX | > + HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM, > + HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | HWMON_P_MIN | HWMON_P_MAX | > + HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM, > + 0 > +}; > + > +static const struct hwmon_channel_info ltc2992_power = { > + .type = hwmon_power, > + .config = ltc2992_power_config, > +}; > + > +static const struct hwmon_channel_info *ltc2992_info[] = { > + <c2992_chip, > + <c2992_in, > + <c2992_curr, > + <c2992_power, > + NULL > +}; > + > +static const struct hwmon_chip_info ltc2992_chip_info = { > + .ops = <c2992_hwmon_ops, > + .info = ltc2992_info, > +}; > + > +static const struct regmap_config ltc2992_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + .max_register = 0xE8, > +}; > + > +static int ltc2992_parse_dt(struct ltc2992_state *st) > +{ > + struct fwnode_handle *fwnode; > + struct fwnode_handle *child; > + u32 addr; > + u32 val; > + int ret; > + > + fwnode = dev_fwnode(&st->client->dev); > + > + fwnode_for_each_available_child_node(fwnode, child) { > + ret = fwnode_property_read_u32(child, "reg", &addr); > + if (ret < 0) > + return ret; > + > + if (addr > 1) > + return -EINVAL; > + > + ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val); > + if (!ret) > + st->r_sense_uohm[addr] = val; > + } > + > + return 0; > +} > + > +static int ltc2992_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) > +{ > + struct device *hwmon_dev; > + struct ltc2992_state *st; > + int ret; > + > + st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL); > + if (!st) > + return -ENOMEM; > + > + st->client = client; > + st->regmap = devm_regmap_init_i2c(client, <c2992_regmap_config); > + if (IS_ERR(st->regmap)) > + return PTR_ERR(st->regmap); > + > + ret = ltc2992_parse_dt(st); > + if (ret < 0) > + return ret; > + > + hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st, > + <c2992_chip_info, NULL); > + > + return PTR_ERR_OR_ZERO(hwmon_dev); > +} > + > +static const struct of_device_id ltc2992_of_match[] = { > + { .compatible = "adi,ltc2992" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, ltc2992_of_match); > + > +static const struct i2c_device_id ltc2992_i2c_id[] = { > + {"ltc2992", 0}, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id); > + > +static struct i2c_driver ltc2992_i2c_driver = { > + .driver = { > + .name = "ltc2992", > + .of_match_table = ltc2992_of_match, > + }, > + .probe = ltc2992_i2c_probe, > + .id_table = ltc2992_i2c_id, > +}; > + > +module_i2c_driver(ltc2992_i2c_driver); > + > +MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>"); > +MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992"); > +MODULE_LICENSE("Dual BSD/GPL"); > -- > 2.20.1 >
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index e6b91ab12978..98575a8b1918 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -100,6 +100,7 @@ Hardware Monitoring Kernel Drivers lm95234 lm95245 lochnagar + ltc2992 ltc2945 ltc2947 ltc2978 diff --git a/Documentation/hwmon/ltc2992.rst b/Documentation/hwmon/ltc2992.rst new file mode 100644 index 000000000000..46aa1aa84a1a --- /dev/null +++ b/Documentation/hwmon/ltc2992.rst @@ -0,0 +1,56 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver ltc2992 +===================== + +Supported chips: + * Linear Technology LTC2992 + Prefix: 'ltc2992' + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2992.pdf + +Author: Alexandru Tachici <alexandru.tachici@analog.com> + + +Description +----------- + +This driver supports hardware monitoring for Linear Technology LTC2992 power monitor. + +LTC2992 is a rail-to-rail system monitor that measures current, +voltage, and power of two supplies. + +Two ADCs simultaneously measure each supply’s current. A third ADC monitors +the input voltages and four auxiliary external voltages. + + +Sysfs entries +------------- + +The following attributes are supported. Limits are read-write, +all other attributes are read-only. + +in_reset_history Reset all highest/lowest values. + +inX_input Measured voltage. +inX_lowest Minimum measured voltage. +inX_highest Maximum measured voltage. +inX_min Minimum voltage allowed. +inX_max Maximum voltage allowed. +inX_min_alarm An undervoltage occurred. Cleared on read. +inX_max_alarm An overvoltage occurred. Cleared on read. + +currX_input Measured current. +currX_lowest Minimum measured current. +currX_highest Maximum measured current. +currX_min Minimum current allowed. +currX_max Maximum current allowed. +currX_min_alarm An undercurrent occurred. Cleared on read. +currX_max_alarm An overcurrent occurred. Cleared on read. + +powerX_input Measured power. +powerX_input_lowest Minimum measured voltage. +powerX_input_highest Maximum measured voltage. +powerX_min Minimum power. +powerX_max Maximum power. +powerX_min_alarm An underpower occurred. Cleared on read. +powerX_max_alarm An overpower occurred. Cleared on read. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index a850e4f0e0bd..bf9e387270d6 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -858,6 +858,17 @@ config SENSORS_LTC2990 This driver can also be built as a module. If so, the module will be called ltc2990. +config SENSORS_LTC2992 + tristate "Linear Technology LTC2992" + depends on I2C + help + If you say yes here you get support for Linear Technology LTC2992 + I2C System Monitor. The LTC2992 measures current, voltage, and + power of two supplies. + + This driver can also be built as a module. If so, the module will + be called ltc2992. + config SENSORS_LTC4151 tristate "Linear Technology LTC4151" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 9db2903b61e5..d6172c4807c4 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_LTC2947) += ltc2947-core.o obj-$(CONFIG_SENSORS_LTC2947_I2C) += ltc2947-i2c.o obj-$(CONFIG_SENSORS_LTC2947_SPI) += ltc2947-spi.o obj-$(CONFIG_SENSORS_LTC2990) += ltc2990.o +obj-$(CONFIG_SENSORS_LTC2992) += ltc2992.o obj-$(CONFIG_SENSORS_LTC4151) += ltc4151.o obj-$(CONFIG_SENSORS_LTC4215) += ltc4215.o obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c new file mode 100644 index 000000000000..c11d585a9600 --- /dev/null +++ b/drivers/hwmon/ltc2992.c @@ -0,0 +1,813 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +/* + * LTC2992 - Dual Wide Range Power Monitor + * + * Copyright 2020 Analog Devices Inc. + */ + +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/regmap.h> + +#define LTC2992_CTRLB 0x01 +#define LTC2992_FAULT1 0x03 +#define LTC2992_POWER1 0x05 +#define LTC2992_POWER1_MAX 0x08 +#define LTC2992_POWER1_MIN 0x0B +#define LTC2992_POWER1_MAX_THRESH 0x0E +#define LTC2992_POWER1_MIN_THRESH 0x11 +#define LTC2992_DSENSE1 0x14 +#define LTC2992_DSENSE1_MAX 0x16 +#define LTC2992_DSENSE1_MIN 0x18 +#define LTC2992_DSENSE1_MAX_THRESH 0x1A +#define LTC2992_DSENSE1_MIN_THRESH 0x1C +#define LTC2992_SENSE1 0x1E +#define LTC2992_SENSE1_MAX 0x20 +#define LTC2992_SENSE1_MIN 0x22 +#define LTC2992_SENSE1_MAX_THRESH 0x24 +#define LTC2992_SENSE1_MIN_THRESH 0x26 +#define LTC2992_G1 0x28 +#define LTC2992_G1_MAX 0x2A +#define LTC2992_G1_MIN 0x2C +#define LTC2992_G1_MAX_THRESH 0x2E +#define LTC2992_G1_MIN_THRESH 0x30 +#define LTC2992_FAULT2 0x35 +#define LTC2992_G2 0x5A +#define LTC2992_G2_MAX 0x5C +#define LTC2992_G2_MIN 0x5E +#define LTC2992_G2_MAX_THRESH 0x60 +#define LTC2992_G2_MIN_THRESH 0x62 +#define LTC2992_G3 0x64 +#define LTC2992_G3_MAX 0x66 +#define LTC2992_G3_MIN 0x68 +#define LTC2992_G3_MAX_THRESH 0x6A +#define LTC2992_G3_MIN_THRESH 0x6C +#define LTC2992_G4 0x6E +#define LTC2992_G4_MAX 0x70 +#define LTC2992_G4_MIN 0x72 +#define LTC2992_G4_MAX_THRESH 0x74 +#define LTC2992_G4_MIN_THRESH 0x76 +#define LTC2992_FAULT3 0x92 + +#define LTC2992_POWER(x) (LTC2992_POWER1 + ((x) * 0x32)) +#define LTC2992_POWER_MAX(x) (LTC2992_POWER1_MAX + ((x) * 0x32)) +#define LTC2992_POWER_MIN(x) (LTC2992_POWER1_MIN + ((x) * 0x32)) +#define LTC2992_POWER_MAX_THRESH(x) (LTC2992_POWER1_MAX_THRESH + ((x) * 0x32)) +#define LTC2992_POWER_MIN_THRESH(x) (LTC2992_POWER1_MIN_THRESH + ((x) * 0x32)) +#define LTC2992_DSENSE(x) (LTC2992_DSENSE1 + ((x) * 0x32)) +#define LTC2992_DSENSE_MAX(x) (LTC2992_DSENSE1_MAX + ((x) * 0x32)) +#define LTC2992_DSENSE_MIN(x) (LTC2992_DSENSE1_MIN + ((x) * 0x32)) +#define LTC2992_DSENSE_MAX_THRESH(x) (LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32)) +#define LTC2992_DSENSE_MIN_THRESH(x) (LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32)) +#define LTC2992_SENSE(x) (LTC2992_SENSE1 + ((x) * 0x32)) +#define LTC2992_SENSE_MAX(x) (LTC2992_SENSE1_MAX + ((x) * 0x32)) +#define LTC2992_SENSE_MIN(x) (LTC2992_SENSE1_MIN + ((x) * 0x32)) +#define LTC2992_SENSE_MAX_THRESH(x) (LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32)) +#define LTC2992_SENSE_MIN_THRESH(x) (LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32)) +#define LTC2992_POWER_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) +#define LTC2992_SENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) +#define LTC2992_DSENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) + +/* CTRLB register bitfields */ +#define LTC2992_RESET_HISTORY BIT(3) + +/* FAULT1 FAULT2 registers common bitfields */ +#define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x)) +#define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x)) +#define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x)) + +/* FAULT1 bitfields */ +#define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x)) + +/* FAULT2 bitfields */ +#define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x)) + +/* FAULT3 bitfields */ +#define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x)) +#define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x)) + +#define LTC2992_IADC_NANOV_LSB 12500 +#define LTC2992_VADC_UV_LSB 25000 +#define LTC2992_VADC_GPIO_UV_LSB 500 + +struct ltc2992_state { + struct i2c_client *client; + struct regmap *regmap; + u32 r_sense_uohm[2]; +}; + +struct ltc2992_gpio_regs { + u8 data; + u8 max; + u8 min; + u8 max_thresh; + u8 min_thresh; + u8 alarm; + u8 min_alarm_msk; + u8 max_alarm_msk; +}; + +static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = { + { + .data = LTC2992_G1, + .max = LTC2992_G1_MAX, + .min = LTC2992_G1_MIN, + .max_thresh = LTC2992_G1_MAX_THRESH, + .min_thresh = LTC2992_G1_MIN_THRESH, + .alarm = LTC2992_FAULT1, + .min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0), + .max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1), + }, + { + .data = LTC2992_G2, + .max = LTC2992_G2_MAX, + .min = LTC2992_G2_MIN, + .max_thresh = LTC2992_G2_MAX_THRESH, + .min_thresh = LTC2992_G2_MIN_THRESH, + .alarm = LTC2992_FAULT2, + .min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0), + .max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1), + }, + { + .data = LTC2992_G3, + .max = LTC2992_G3_MAX, + .min = LTC2992_G3_MIN, + .max_thresh = LTC2992_G3_MAX_THRESH, + .min_thresh = LTC2992_G3_MIN_THRESH, + .alarm = LTC2992_FAULT3, + .min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0), + .max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1), + }, + { + .data = LTC2992_G4, + .max = LTC2992_G4_MAX, + .min = LTC2992_G4_MIN, + .max_thresh = LTC2992_G4_MAX_THRESH, + .min_thresh = LTC2992_G4_MIN_THRESH, + .alarm = LTC2992_FAULT3, + .min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0), + .max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1), + }, +}; + +static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len) +{ + u8 regvals[4]; + int ret; + int val; + int i; + + ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len); + if (ret < 0) + return ret; + + val = 0; + for (i = 0; i < reg_len; i++) + val |= regvals[reg_len - i - 1] << (i * 8); + + return val; +} + +static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val) +{ + u8 regvals[4]; + int i; + + for (i = 0; i < reg_len; i++) + regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF; + + return regmap_bulk_write(st->regmap, addr, regvals, reg_len); +} + +static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, + int channel) +{ + const struct ltc2992_state *st = data; + + switch (type) { + case hwmon_chip: + switch (attr) { + case hwmon_chip_in_reset_history: + return 0200; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + case hwmon_in_lowest: + case hwmon_in_highest: + case hwmon_in_min_alarm: + case hwmon_in_max_alarm: + return 0444; + case hwmon_in_min: + case hwmon_in_max: + return 0644; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + case hwmon_curr_lowest: + case hwmon_curr_highest: + case hwmon_curr_min_alarm: + case hwmon_curr_max_alarm: + if (st->r_sense_uohm[channel]) + return 0444; + break; + case hwmon_curr_min: + case hwmon_curr_max: + if (st->r_sense_uohm[channel]) + return 0644; + break; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + case hwmon_power_input_lowest: + case hwmon_power_input_highest: + case hwmon_power_min_alarm: + case hwmon_power_max_alarm: + if (st->r_sense_uohm[channel]) + return 0444; + break; + case hwmon_power_min: + case hwmon_power_max: + if (st->r_sense_uohm[channel]) + return 0644; + break; + } + break; + default: + break; + } + + return 0; +} + +static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val) +{ + int reg_val; + + reg_val = ltc2992_read_reg(st, reg, 2); + if (reg_val < 0) + return reg_val; + + reg_val = reg_val >> 4; + *val = DIV_ROUND_CLOSEST(reg_val * scale, 1000); + + return 0; +} + +static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val) +{ + val = DIV_ROUND_CLOSEST(val * 1000, scale); + val = val << 4; + + return ltc2992_write_reg(st, reg, 2, val); +} + +static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, u32 attr, long *val) +{ + int reg_val; + u32 mask; + + if (attr == hwmon_in_max_alarm) + mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk; + else + mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk; + + reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1); + if (reg_val < 0) + return reg_val; + + *val = !!(reg_val & mask); + reg_val &= ~mask; + + return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val); +} + +static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_in_input: + reg = ltc2992_gpio_addr_map[nr_gpio].data; + break; + case hwmon_in_lowest: + reg = ltc2992_gpio_addr_map[nr_gpio].min; + break; + case hwmon_in_highest: + reg = ltc2992_gpio_addr_map[nr_gpio].max; + break; + case hwmon_in_min: + reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; + break; + case hwmon_in_max: + reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; + break; + case hwmon_in_min_alarm: + case hwmon_in_max_alarm: + return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val); + default: + return -EOPNOTSUPP; + } + + return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); +} + +static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) +{ + u32 reg_val; + u32 mask; + + if (attr == hwmon_in_max_alarm) + mask = LTC2992_SENSE_FAULT_MSK(1); + else + mask = LTC2992_SENSE_FAULT_MSK(0); + + reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1); + if (reg_val < 0) + return reg_val; + + *val = !!(reg_val & mask); + reg_val &= ~mask; + + return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val); +} + +static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + if (channel > 1) + return ltc2992_read_gpios_in(dev, attr, channel - 2, val); + + switch (attr) { + case hwmon_in_input: + reg = LTC2992_SENSE(channel); + break; + case hwmon_in_lowest: + reg = LTC2992_SENSE_MIN(channel); + break; + case hwmon_in_highest: + reg = LTC2992_SENSE_MAX(channel); + break; + case hwmon_in_min: + reg = LTC2992_SENSE_MIN_THRESH(channel); + break; + case hwmon_in_max: + reg = LTC2992_SENSE_MAX_THRESH(channel); + break; + case hwmon_in_min_alarm: + case hwmon_in_max_alarm: + return ltc2992_read_in_alarm(st, channel, val, attr); + default: + return -EOPNOTSUPP; + } + + return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val); +} + +static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val) +{ + u32 reg_val; + + reg_val = ltc2992_read_reg(st, reg, 2); + if (reg_val < 0) + return reg_val; + + reg_val = reg_val >> 4; + *val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]); + + return 0; +} + +static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val) +{ + u32 reg_val; + + reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB); + reg_val = reg_val << 4; + + return ltc2992_write_reg(st, reg, 2, reg_val); +} + +static int ltc2992_read_curr_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) +{ + u32 reg_val; + u32 mask; + + if (attr == hwmon_curr_max_alarm) + mask = LTC2992_DSENSE_FAULT_MSK(1); + else + mask = LTC2992_DSENSE_FAULT_MSK(0); + + reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1); + if (reg_val < 0) + return reg_val; + + *val = !!(reg_val & mask); + + reg_val &= ~mask; + return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val); +} + +static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_curr_input: + reg = LTC2992_DSENSE(channel); + break; + case hwmon_curr_lowest: + reg = LTC2992_DSENSE_MIN(channel); + break; + case hwmon_curr_highest: + reg = LTC2992_DSENSE_MAX(channel); + break; + case hwmon_curr_min: + reg = LTC2992_DSENSE_MIN_THRESH(channel); + break; + case hwmon_curr_max: + reg = LTC2992_DSENSE_MAX_THRESH(channel); + break; + case hwmon_curr_min_alarm: + case hwmon_curr_max_alarm: + return ltc2992_read_curr_alarm(st, channel, val, attr); + default: + return -EOPNOTSUPP; + } + + return ltc2992_get_current(st, reg, channel, val); +} + +static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val) +{ + u32 reg_val; + + reg_val = ltc2992_read_reg(st, reg, 3); + if (reg_val < 0) + return reg_val; + + *val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB, + st->r_sense_uohm[channel] * 1000); + + return 0; +} + +static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val) +{ + u32 reg_val; + + reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000, + LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB); + + return ltc2992_write_reg(st, reg, 3, reg_val); +} + +static int ltc2992_read_power_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) +{ + u32 reg_val; + u32 mask; + + if (attr == hwmon_power_max_alarm) + mask = LTC2992_POWER_FAULT_MSK(1); + else + mask = LTC2992_POWER_FAULT_MSK(0); + + reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1); + if (reg_val < 0) + return reg_val; + + *val = !!(reg_val & mask); + reg_val &= ~mask; + + return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val); +} + +static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_power_input: + reg = LTC2992_POWER(channel); + break; + case hwmon_power_input_lowest: + reg = LTC2992_POWER_MIN(channel); + break; + case hwmon_power_input_highest: + reg = LTC2992_POWER_MAX(channel); + break; + case hwmon_power_min: + reg = LTC2992_POWER_MIN_THRESH(channel); + break; + case hwmon_power_max: + reg = LTC2992_POWER_MAX_THRESH(channel); + break; + case hwmon_power_min_alarm: + case hwmon_power_max_alarm: + return ltc2992_read_power_alarm(st, channel, val, attr); + default: + return -EOPNOTSUPP; + } + + return ltc2992_get_power(st, reg, channel, val); +} + +static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, + long *val) +{ + switch (type) { + case hwmon_in: + return ltc2992_read_in(dev, attr, channel, val); + case hwmon_curr: + return ltc2992_read_curr(dev, attr, channel, val); + case hwmon_power: + return ltc2992_read_power(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_curr_min: + reg = LTC2992_DSENSE_MIN_THRESH(channel); + break; + case hwmon_curr_max: + reg = LTC2992_DSENSE_MAX_THRESH(channel); + break; + default: + return -EOPNOTSUPP; + } + + return ltc2992_set_current(st, reg, channel, val); +} + +static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_in_min: + reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; + break; + case hwmon_in_max: + reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; + break; + default: + return -EOPNOTSUPP; + } + + return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); +} + +static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + if (channel > 1) + return ltc2992_write_gpios_in(dev, attr, channel - 2, val); + + switch (attr) { + case hwmon_in_min: + reg = LTC2992_SENSE_MIN_THRESH(channel); + break; + case hwmon_in_max: + reg = LTC2992_SENSE_MAX_THRESH(channel); + break; + default: + return -EOPNOTSUPP; + } + + return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val); +} + +static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + u32 reg; + + switch (attr) { + case hwmon_power_min: + reg = LTC2992_POWER_MIN_THRESH(channel); + break; + case hwmon_power_max: + reg = LTC2992_POWER_MAX_THRESH(channel); + break; + default: + return -EOPNOTSUPP; + } + + return ltc2992_set_power(st, reg, channel, val); +} + +static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val) +{ + struct ltc2992_state *st = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_chip_in_reset_history: + return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY, + LTC2992_RESET_HISTORY); + default: + return -EOPNOTSUPP; + } +} + +static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, + long val) +{ + switch (type) { + case hwmon_chip: + return ltc2992_write_chip(dev, attr, channel, val); + case hwmon_in: + return ltc2992_write_in(dev, attr, channel, val); + case hwmon_curr: + return ltc2992_write_curr(dev, attr, channel, val); + case hwmon_power: + return ltc2992_write_power(dev, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static const struct hwmon_ops ltc2992_hwmon_ops = { + .is_visible = ltc2992_is_visible, + .read = ltc2992_read, + .write = ltc2992_write, +}; + +static const u32 ltc2992_chip_config[] = { + HWMON_C_IN_RESET_HISTORY, + 0 +}; + +static const struct hwmon_channel_info ltc2992_chip = { + .type = hwmon_chip, + .config = ltc2992_chip_config, +}; + +static const u32 ltc2992_in_config[] = { + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | HWMON_I_MAX | + HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, + 0 +}; + +static const struct hwmon_channel_info ltc2992_in = { + .type = hwmon_in, + .config = ltc2992_in_config, +}; + +static const u32 ltc2992_curr_config[] = { + HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | HWMON_C_MAX | + HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM, + HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | HWMON_C_MAX | + HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM, + 0 +}; + +static const struct hwmon_channel_info ltc2992_curr = { + .type = hwmon_curr, + .config = ltc2992_curr_config, +}; + +static const u32 ltc2992_power_config[] = { + HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | HWMON_P_MIN | HWMON_P_MAX | + HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM, + HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | HWMON_P_MIN | HWMON_P_MAX | + HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM, + 0 +}; + +static const struct hwmon_channel_info ltc2992_power = { + .type = hwmon_power, + .config = ltc2992_power_config, +}; + +static const struct hwmon_channel_info *ltc2992_info[] = { + <c2992_chip, + <c2992_in, + <c2992_curr, + <c2992_power, + NULL +}; + +static const struct hwmon_chip_info ltc2992_chip_info = { + .ops = <c2992_hwmon_ops, + .info = ltc2992_info, +}; + +static const struct regmap_config ltc2992_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xE8, +}; + +static int ltc2992_parse_dt(struct ltc2992_state *st) +{ + struct fwnode_handle *fwnode; + struct fwnode_handle *child; + u32 addr; + u32 val; + int ret; + + fwnode = dev_fwnode(&st->client->dev); + + fwnode_for_each_available_child_node(fwnode, child) { + ret = fwnode_property_read_u32(child, "reg", &addr); + if (ret < 0) + return ret; + + if (addr > 1) + return -EINVAL; + + ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val); + if (!ret) + st->r_sense_uohm[addr] = val; + } + + return 0; +} + +static int ltc2992_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct device *hwmon_dev; + struct ltc2992_state *st; + int ret; + + st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL); + if (!st) + return -ENOMEM; + + st->client = client; + st->regmap = devm_regmap_init_i2c(client, <c2992_regmap_config); + if (IS_ERR(st->regmap)) + return PTR_ERR(st->regmap); + + ret = ltc2992_parse_dt(st); + if (ret < 0) + return ret; + + hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st, + <c2992_chip_info, NULL); + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct of_device_id ltc2992_of_match[] = { + { .compatible = "adi,ltc2992" }, + { } +}; +MODULE_DEVICE_TABLE(of, ltc2992_of_match); + +static const struct i2c_device_id ltc2992_i2c_id[] = { + {"ltc2992", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id); + +static struct i2c_driver ltc2992_i2c_driver = { + .driver = { + .name = "ltc2992", + .of_match_table = ltc2992_of_match, + }, + .probe = ltc2992_i2c_probe, + .id_table = ltc2992_i2c_id, +}; + +module_i2c_driver(ltc2992_i2c_driver); + +MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>"); +MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992"); +MODULE_LICENSE("Dual BSD/GPL");