// SPDX-License-Identifier: GPL-2.0 /* * Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C * * Copyright 2023 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/cleanup.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/i2c.h> #include <linux/math.h> #include <linux/minmax.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <linux/property.h> #include <linux/string.h> #include <linux/units.h> #include <linux/util_macros.h> #define LTC4282_CTRL_LSB … #define LTC4282_CTRL_OV_RETRY_MASK … #define LTC4282_CTRL_UV_RETRY_MASK … #define LTC4282_CTRL_OC_RETRY_MASK … #define LTC4282_CTRL_ON_ACTIVE_LOW_MASK … #define LTC4282_CTRL_ON_DELAY_MASK … #define LTC4282_CTRL_MSB … #define LTC4282_CTRL_VIN_MODE_MASK … #define LTC4282_CTRL_OV_MODE_MASK … #define LTC4282_CTRL_UV_MODE_MASK … #define LTC4282_FAULT_LOG … #define LTC4282_OV_FAULT_MASK … #define LTC4282_UV_FAULT_MASK … #define LTC4282_VDD_FAULT_MASK … #define LTC4282_OC_FAULT_MASK … #define LTC4282_POWER_BAD_FAULT_MASK … #define LTC4282_FET_SHORT_FAULT_MASK … #define LTC4282_FET_BAD_FAULT_MASK … #define LTC4282_FET_FAILURE_FAULT_MASK … #define LTC4282_ADC_ALERT_LOG … #define LTC4282_GPIO_ALARM_L_MASK … #define LTC4282_GPIO_ALARM_H_MASK … #define LTC4282_VSOURCE_ALARM_L_MASK … #define LTC4282_VSOURCE_ALARM_H_MASK … #define LTC4282_VSENSE_ALARM_L_MASK … #define LTC4282_VSENSE_ALARM_H_MASK … #define LTC4282_POWER_ALARM_L_MASK … #define LTC4282_POWER_ALARM_H_MASK … #define LTC4282_FET_BAD_FAULT_TIMEOUT … #define LTC4282_FET_BAD_MAX_TIMEOUT … #define LTC4282_GPIO_CONFIG … #define LTC4282_GPIO_2_FET_STRESS_MASK … #define LTC4282_GPIO_1_CONFIG_MASK … #define LTC4282_VGPIO_MIN … #define LTC4282_VGPIO_MAX … #define LTC4282_VSOURCE_MIN … #define LTC4282_VSOURCE_MAX … #define LTC4282_VSENSE_MIN … #define LTC4282_VSENSE_MAX … #define LTC4282_POWER_MIN … #define LTC4282_POWER_MAX … #define LTC4282_CLK_DIV … #define LTC4282_CLK_DIV_MASK … #define LTC4282_CLKOUT_MASK … #define LTC4282_ILIM_ADJUST … #define LTC4282_GPIO_MODE_MASK … #define LTC4282_VDD_MONITOR_MASK … #define LTC4282_FOLDBACK_MODE_MASK … #define LTC4282_ILIM_ADJUST_MASK … #define LTC4282_ENERGY … #define LTC4282_TIME_COUNTER … #define LTC4282_ALERT_CTRL … #define LTC4282_ALERT_OUT_MASK … #define LTC4282_ADC_CTRL … #define LTC4282_FAULT_LOG_EN_MASK … #define LTC4282_METER_HALT_MASK … #define LTC4282_METER_RESET_MASK … #define LTC4282_RESET_MASK … #define LTC4282_STATUS_LSB … #define LTC4282_OV_STATUS_MASK … #define LTC4282_UV_STATUS_MASK … #define LTC4282_VDD_STATUS_MASK … #define LTC4282_OC_STATUS_MASK … #define LTC4282_POWER_GOOD_MASK … #define LTC4282_FET_FAILURE_MASK … #define LTC4282_STATUS_MSB … #define LTC4282_RESERVED_1 … #define LTC4282_RESERVED_2 … #define LTC4282_VGPIO … #define LTC4282_VGPIO_LOWEST … #define LTC4282_VGPIO_HIGHEST … #define LTC4282_VSOURCE … #define LTC4282_VSOURCE_LOWEST … #define LTC4282_VSOURCE_HIGHEST … #define LTC4282_VSENSE … #define LTC4282_VSENSE_LOWEST … #define LTC4282_VSENSE_HIGHEST … #define LTC4282_POWER … #define LTC4282_POWER_LOWEST … #define LTC4282_POWER_HIGHEST … #define LTC4282_RESERVED_3 … #define LTC4282_CLKIN_MIN … #define LTC4282_CLKIN_MAX … #define LTC4282_CLKIN_RANGE … #define LTC4282_CLKOUT_SYSTEM … #define LTC4282_CLKOUT_CNV … enum { … }; struct ltc4282_cache { … }; struct ltc4282_state { … }; enum { … }; static int ltc4282_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { … } /* * Note the 15HZ conversion rate assumes 12bit ADC which is what we are * supporting for now. */ static const unsigned int ltc4282_out_rates[] = …; static long ltc4282_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { … } static unsigned long ltc4282_recalc_rate(struct clk_hw *hw, unsigned long parent) { … } static void ltc4282_disable(struct clk_hw *clk_hw) { … } static int ltc4282_read_voltage_word(const struct ltc4282_state *st, u32 reg, u32 fs, long *val) { … } static int ltc4282_read_voltage_byte_cached(const struct ltc4282_state *st, u32 reg, u32 fs, long *val, u32 *cached_raw) { … } static int ltc4282_read_voltage_byte(const struct ltc4282_state *st, u32 reg, u32 fs, long *val) { … } static int __ltc4282_read_alarm(struct ltc4282_state *st, u32 reg, u32 mask, long *val) { … } static int ltc4282_read_alarm(struct ltc4282_state *st, u32 reg, u32 mask, long *val) { … } static int ltc4282_vdd_source_read_in(struct ltc4282_state *st, u32 channel, long *val) { … } static int ltc4282_vdd_source_read_hist(struct ltc4282_state *st, u32 reg, u32 channel, long *cached, long *val) { … } static int ltc4282_vdd_source_read_lim(struct ltc4282_state *st, u32 reg, u32 channel, u32 *cached, long *val) { … } static int ltc4282_vdd_source_read_alm(struct ltc4282_state *st, u32 mask, u32 channel, long *val) { … } static int ltc4282_read_in(struct ltc4282_state *st, u32 attr, long *val, u32 channel) { … } static int ltc4282_read_current_word(const struct ltc4282_state *st, u32 reg, long *val) { … } static int ltc4282_read_current_byte(const struct ltc4282_state *st, u32 reg, long *val) { … } static int ltc4282_read_curr(struct ltc4282_state *st, const u32 attr, long *val) { … } static int ltc4282_read_power_word(const struct ltc4282_state *st, u32 reg, long *val) { … } static int ltc4282_read_power_byte(const struct ltc4282_state *st, u32 reg, long *val) { … } static int ltc4282_read_energy(const struct ltc4282_state *st, u64 *val) { … } static int ltc4282_read_power(struct ltc4282_state *st, const u32 attr, long *val) { … } static int ltc4282_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int ltc4282_write_power_byte(const struct ltc4282_state *st, u32 reg, long val) { … } static int ltc4282_write_power_word(const struct ltc4282_state *st, u32 reg, long val) { … } static int __ltc4282_in_write_history(const struct ltc4282_state *st, u32 reg, long lowest, long highest, u32 fs) { … } static int ltc4282_in_write_history(struct ltc4282_state *st, u32 reg, long lowest, long highest, u32 fs) { … } static int ltc4282_power_reset_hist(struct ltc4282_state *st) { … } static int ltc4282_write_power(struct ltc4282_state *st, u32 attr, long val) { … } static int ltc4282_write_voltage_byte_cached(const struct ltc4282_state *st, u32 reg, u32 fs, long val, u32 *cache_raw) { … } static int ltc4282_write_voltage_byte(const struct ltc4282_state *st, u32 reg, u32 fs, long val) { … } static int ltc4282_cache_history(struct ltc4282_state *st, u32 channel) { … } static int ltc4282_cache_sync(struct ltc4282_state *st, u32 channel) { … } static int ltc4282_vdd_source_write_lim(struct ltc4282_state *st, u32 reg, int channel, u32 *cache, long val) { … } static int ltc4282_vdd_source_reset_hist(struct ltc4282_state *st, int channel) { … } /* * We need to mux between VSOURCE and VDD which means they are mutually * exclusive. Moreover, we can't really disable both VDD and VSOURCE as the ADC * is continuously running (we cannot independently halt it without also * stopping VGPIO). Hence, the logic is that disabling or enabling VDD will * automatically have the reverse effect on VSOURCE and vice-versa. */ static int ltc4282_vdd_source_enable(struct ltc4282_state *st, int channel, long val) { … } static int ltc4282_write_in(struct ltc4282_state *st, u32 attr, long val, int channel) { … } static int ltc4282_curr_reset_hist(struct ltc4282_state *st) { … } static int ltc4282_write_curr(struct ltc4282_state *st, u32 attr, long val) { … } static int ltc4282_energy_enable_set(struct ltc4282_state *st, long val) { … } static int ltc4282_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } static umode_t ltc4282_in_is_visible(const struct ltc4282_state *st, u32 attr) { … } static umode_t ltc4282_curr_is_visible(u32 attr) { … } static umode_t ltc4282_power_is_visible(u32 attr) { … } static umode_t ltc4282_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { … } static const char * const ltc4282_in_strs[] = …; static int ltc4282_read_labels(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, const char **str) { … } static ssize_t ltc4282_energy_show(struct device *dev, struct device_attribute *da, char *buf) { … } static const struct clk_ops ltc4282_ops = …; static int ltc428_clk_provider_setup(struct ltc4282_state *st, struct device *dev) { … } static int ltc428_clks_setup(struct ltc4282_state *st, struct device *dev) { … } static const int ltc4282_curr_lim_uv[] = …; static int ltc4282_get_defaults(struct ltc4282_state *st, u32 *vin_mode) { … } /* * Set max limits for ISENSE and Power as that depends on the max voltage on * rsense that is defined in ILIM_ADJUST. This is specially important for power * because for some rsense and vfsout values, if we allow the default raw 255 * value, that would overflow long in 32bit archs when reading back the max * power limit. * * Also set meaningful historic values for VDD and VSOURCE * (0 would not mean much). */ static int ltc4282_set_max_limits(struct ltc4282_state *st) { … } static const char * const ltc4282_gpio1_modes[] = …; static const char * const ltc4282_gpio2_modes[] = …; static int ltc4282_gpio_setup(struct ltc4282_state *st, struct device *dev) { … } static const char * const ltc4282_dividers[] = …; /* This maps the Vout full scale for the given Vin mode */ static const u16 ltc4282_vfs_milli[] = …; static const u16 ltc4282_vdd_milli[] = …; enum { … }; static int ltc4282_setup(struct ltc4282_state *st, struct device *dev) { … } static bool ltc4282_readable_reg(struct device *dev, unsigned int reg) { … } static bool ltc4282_writable_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config ltc4282_regmap_config = …; static const struct hwmon_channel_info * const ltc4282_info[] = …; static const struct hwmon_ops ltc4282_hwmon_ops = …; static const struct hwmon_chip_info ltc2947_chip_info = …; /* energy attributes are 6bytes wide so we need u64 */ static SENSOR_DEVICE_ATTR_RO(energy1_input, ltc4282_energy, 0); static struct attribute *ltc4282_attrs[] = …; ATTRIBUTE_GROUPS(…); static int ltc4282_show_fault_log(void *arg, u64 *val, u32 mask) { … } static int ltc4282_show_curr1_crit_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int ltc4282_show_in1_lcrit_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int ltc4282_show_in1_crit_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int ltc4282_show_fet_bad_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int ltc4282_show_fet_short_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int ltc4282_show_power1_bad_fault_log(void *arg, u64 *val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static void ltc4282_debugfs_remove(void *dir) { … } static void ltc4282_debugfs_init(struct ltc4282_state *st, struct i2c_client *i2c, const struct device *hwmon) { … } static int ltc4282_probe(struct i2c_client *i2c) { … } static const struct of_device_id ltc4282_of_match[] = …; MODULE_DEVICE_TABLE(of, ltc4282_of_match); static struct i2c_driver ltc4282_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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