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771 lines
19 KiB
771 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Driver for Texas Instruments TMP512, TMP513 power monitor chips |
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* |
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* TMP513: |
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* Thermal/Power Management with Triple Remote and |
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* Local Temperature Sensor and Current Shunt Monitor |
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* Datasheet: https://www.ti.com/lit/gpn/tmp513 |
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* |
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* TMP512: |
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* Thermal/Power Management with Dual Remote |
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* and Local Temperature Sensor and Current Shunt Monitor |
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* Datasheet: https://www.ti.com/lit/gpn/tmp512 |
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* |
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* Copyright (C) 2019 Eric Tremblay <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; version 2 of the License. |
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*/ |
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|
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/util_macros.h> |
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|
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// Common register definition |
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#define TMP51X_SHUNT_CONFIG 0x00 |
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#define TMP51X_TEMP_CONFIG 0x01 |
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#define TMP51X_STATUS 0x02 |
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#define TMP51X_SMBUS_ALERT 0x03 |
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#define TMP51X_SHUNT_CURRENT_RESULT 0x04 |
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#define TMP51X_BUS_VOLTAGE_RESULT 0x05 |
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#define TMP51X_POWER_RESULT 0x06 |
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#define TMP51X_BUS_CURRENT_RESULT 0x07 |
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#define TMP51X_LOCAL_TEMP_RESULT 0x08 |
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#define TMP51X_REMOTE_TEMP_RESULT_1 0x09 |
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#define TMP51X_REMOTE_TEMP_RESULT_2 0x0A |
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#define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C |
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#define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D |
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#define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E |
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#define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F |
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#define TMP51X_POWER_LIMIT 0x10 |
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#define TMP51X_LOCAL_TEMP_LIMIT 0x11 |
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#define TMP51X_REMOTE_TEMP_LIMIT_1 0x12 |
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#define TMP51X_REMOTE_TEMP_LIMIT_2 0x13 |
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#define TMP51X_SHUNT_CALIBRATION 0x15 |
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#define TMP51X_N_FACTOR_AND_HYST_1 0x16 |
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#define TMP51X_N_FACTOR_2 0x17 |
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#define TMP51X_MAN_ID_REG 0xFE |
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#define TMP51X_DEVICE_ID_REG 0xFF |
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|
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// TMP513 specific register definition |
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#define TMP513_REMOTE_TEMP_RESULT_3 0x0B |
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#define TMP513_REMOTE_TEMP_LIMIT_3 0x14 |
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#define TMP513_N_FACTOR_3 0x18 |
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|
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// Common attrs, and NULL |
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#define TMP51X_MANUFACTURER_ID 0x55FF |
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|
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#define TMP512_DEVICE_ID 0x22FF |
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#define TMP513_DEVICE_ID 0x23FF |
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|
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// Default config |
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#define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F |
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#define TMP51X_SHUNT_VALUE_DEFAULT 1000 |
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#define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V |
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#define TMP51X_PGA_DEFAULT 8 |
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#define TMP51X_MAX_REGISTER_ADDR 0xFF |
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#define TMP512_TEMP_CONFIG_DEFAULT 0xBF80 |
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#define TMP513_TEMP_CONFIG_DEFAULT 0xFF80 |
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|
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// Mask and shift |
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#define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800 |
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#define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000 |
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#define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800 |
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#define CURRENT_SENSE_VOLTAGE_40_MASK 0 |
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#define TMP51X_BUS_VOLTAGE_MASK 0x2000 |
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#define TMP51X_NFACTOR_MASK 0xFF00 |
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#define TMP51X_HYST_MASK 0x00FF |
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#define TMP51X_BUS_VOLTAGE_SHIFT 3 |
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#define TMP51X_TEMP_SHIFT 3 |
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// Alarms |
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#define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15 |
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#define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14 |
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#define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13 |
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#define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12 |
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#define TMP51X_POWER_LIMIT_POS 11 |
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#define TMP51X_LOCAL_TEMP_LIMIT_POS 10 |
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#define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9 |
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#define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8 |
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#define TMP513_REMOTE_TEMP_LIMIT_3_POS 7 |
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#define TMP51X_VBUS_RANGE_32V 32000000 |
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#define TMP51X_VBUS_RANGE_16V 16000000 |
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// Max and Min value |
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#define MAX_BUS_VOLTAGE_32_LIMIT 32764 |
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#define MAX_BUS_VOLTAGE_16_LIMIT 16382 |
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// Max possible value is -256 to +256 but datasheet indicated -40 to 125. |
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#define MAX_TEMP_LIMIT 125000 |
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#define MIN_TEMP_LIMIT -40000 |
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#define MAX_TEMP_HYST 127500 |
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static const u8 TMP51X_TEMP_INPUT[4] = { |
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TMP51X_LOCAL_TEMP_RESULT, |
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TMP51X_REMOTE_TEMP_RESULT_1, |
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TMP51X_REMOTE_TEMP_RESULT_2, |
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TMP513_REMOTE_TEMP_RESULT_3 |
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}; |
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static const u8 TMP51X_TEMP_CRIT[4] = { |
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TMP51X_LOCAL_TEMP_LIMIT, |
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TMP51X_REMOTE_TEMP_LIMIT_1, |
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TMP51X_REMOTE_TEMP_LIMIT_2, |
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TMP513_REMOTE_TEMP_LIMIT_3 |
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}; |
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static const u8 TMP51X_TEMP_CRIT_ALARM[4] = { |
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TMP51X_LOCAL_TEMP_LIMIT_POS, |
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TMP51X_REMOTE_TEMP_LIMIT_1_POS, |
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TMP51X_REMOTE_TEMP_LIMIT_2_POS, |
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TMP513_REMOTE_TEMP_LIMIT_3_POS |
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}; |
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static const u8 TMP51X_TEMP_CRIT_HYST[4] = { |
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TMP51X_N_FACTOR_AND_HYST_1, |
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TMP51X_N_FACTOR_AND_HYST_1, |
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TMP51X_N_FACTOR_AND_HYST_1, |
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TMP51X_N_FACTOR_AND_HYST_1 |
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}; |
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static const u8 TMP51X_CURR_INPUT[2] = { |
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TMP51X_SHUNT_CURRENT_RESULT, |
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TMP51X_BUS_CURRENT_RESULT |
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}; |
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static struct regmap_config tmp51x_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 16, |
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.max_register = TMP51X_MAX_REGISTER_ADDR, |
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}; |
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enum tmp51x_ids { |
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tmp512, tmp513 |
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}; |
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struct tmp51x_data { |
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u16 shunt_config; |
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u16 pga_gain; |
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u32 vbus_range_uvolt; |
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u16 temp_config; |
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u32 nfactor[3]; |
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u32 shunt_uohms; |
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u32 curr_lsb_ua; |
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u32 pwr_lsb_uw; |
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enum tmp51x_ids id; |
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struct regmap *regmap; |
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}; |
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// Set the shift based on the gain 8=4, 4=3, 2=2, 1=1 |
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static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data) |
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{ |
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return 5 - ffs(data->pga_gain); |
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} |
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static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos, |
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unsigned int regval, long *val) |
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{ |
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switch (reg) { |
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case TMP51X_STATUS: |
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*val = (regval >> pos) & 1; |
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break; |
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case TMP51X_SHUNT_CURRENT_RESULT: |
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case TMP51X_SHUNT_CURRENT_H_LIMIT: |
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case TMP51X_SHUNT_CURRENT_L_LIMIT: |
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/* |
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* The valus is read in voltage in the chip but reported as |
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* current to the user. |
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* 2's complement number shifted by one to four depending |
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* on the pga gain setting. 1lsb = 10uV |
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*/ |
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*val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data)); |
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*val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms); |
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break; |
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case TMP51X_BUS_VOLTAGE_RESULT: |
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case TMP51X_BUS_VOLTAGE_H_LIMIT: |
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case TMP51X_BUS_VOLTAGE_L_LIMIT: |
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// 1lsb = 4mV |
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*val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4; |
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break; |
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case TMP51X_POWER_RESULT: |
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case TMP51X_POWER_LIMIT: |
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// Power = (current * BusVoltage) / 5000 |
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*val = regval * data->pwr_lsb_uw; |
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break; |
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case TMP51X_BUS_CURRENT_RESULT: |
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// Current = (ShuntVoltage * CalibrationRegister) / 4096 |
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*val = sign_extend32(regval, 16) * data->curr_lsb_ua; |
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*val = DIV_ROUND_CLOSEST(*val, 1000); |
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break; |
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case TMP51X_LOCAL_TEMP_RESULT: |
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case TMP51X_REMOTE_TEMP_RESULT_1: |
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case TMP51X_REMOTE_TEMP_RESULT_2: |
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case TMP513_REMOTE_TEMP_RESULT_3: |
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case TMP51X_LOCAL_TEMP_LIMIT: |
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case TMP51X_REMOTE_TEMP_LIMIT_1: |
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case TMP51X_REMOTE_TEMP_LIMIT_2: |
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case TMP513_REMOTE_TEMP_LIMIT_3: |
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// 1lsb = 0.0625 degrees centigrade |
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*val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT; |
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*val = DIV_ROUND_CLOSEST(*val * 625, 10); |
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break; |
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case TMP51X_N_FACTOR_AND_HYST_1: |
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// 1lsb = 0.5 degrees centigrade |
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*val = (regval & TMP51X_HYST_MASK) * 500; |
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break; |
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default: |
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// Programmer goofed |
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WARN_ON_ONCE(1); |
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*val = 0; |
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return -EOPNOTSUPP; |
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} |
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return 0; |
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} |
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static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val) |
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{ |
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int regval, max_val; |
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u32 mask = 0; |
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switch (reg) { |
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case TMP51X_SHUNT_CURRENT_H_LIMIT: |
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case TMP51X_SHUNT_CURRENT_L_LIMIT: |
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/* |
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* The user enter current value and we convert it to |
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* voltage. 1lsb = 10uV |
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*/ |
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val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000); |
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max_val = U16_MAX >> tmp51x_get_pga_shift(data); |
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regval = clamp_val(val, -max_val, max_val); |
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break; |
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case TMP51X_BUS_VOLTAGE_H_LIMIT: |
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case TMP51X_BUS_VOLTAGE_L_LIMIT: |
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// 1lsb = 4mV |
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max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ? |
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MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT; |
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val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val); |
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regval = val << TMP51X_BUS_VOLTAGE_SHIFT; |
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break; |
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case TMP51X_POWER_LIMIT: |
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regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0, |
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U16_MAX); |
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break; |
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case TMP51X_LOCAL_TEMP_LIMIT: |
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case TMP51X_REMOTE_TEMP_LIMIT_1: |
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case TMP51X_REMOTE_TEMP_LIMIT_2: |
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case TMP513_REMOTE_TEMP_LIMIT_3: |
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// 1lsb = 0.0625 degrees centigrade |
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val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT); |
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regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT; |
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break; |
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case TMP51X_N_FACTOR_AND_HYST_1: |
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// 1lsb = 0.5 degrees centigrade |
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val = clamp_val(val, 0, MAX_TEMP_HYST); |
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regval = DIV_ROUND_CLOSEST(val, 500); |
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mask = TMP51X_HYST_MASK; |
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break; |
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default: |
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// Programmer goofed |
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WARN_ON_ONCE(1); |
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return -EOPNOTSUPP; |
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} |
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if (mask == 0) |
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return regmap_write(data->regmap, reg, regval); |
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else |
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return regmap_update_bits(data->regmap, reg, mask, regval); |
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} |
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static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel) |
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{ |
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switch (type) { |
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case hwmon_temp: |
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switch (attr) { |
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case hwmon_temp_input: |
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return TMP51X_TEMP_INPUT[channel]; |
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case hwmon_temp_crit_alarm: |
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return TMP51X_STATUS; |
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case hwmon_temp_crit: |
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return TMP51X_TEMP_CRIT[channel]; |
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case hwmon_temp_crit_hyst: |
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return TMP51X_TEMP_CRIT_HYST[channel]; |
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} |
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break; |
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case hwmon_in: |
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switch (attr) { |
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case hwmon_in_input: |
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return TMP51X_BUS_VOLTAGE_RESULT; |
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case hwmon_in_lcrit_alarm: |
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case hwmon_in_crit_alarm: |
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return TMP51X_STATUS; |
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case hwmon_in_lcrit: |
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return TMP51X_BUS_VOLTAGE_L_LIMIT; |
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case hwmon_in_crit: |
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return TMP51X_BUS_VOLTAGE_H_LIMIT; |
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} |
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break; |
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case hwmon_curr: |
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switch (attr) { |
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case hwmon_curr_input: |
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return TMP51X_CURR_INPUT[channel]; |
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case hwmon_curr_lcrit_alarm: |
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case hwmon_curr_crit_alarm: |
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return TMP51X_STATUS; |
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case hwmon_curr_lcrit: |
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return TMP51X_SHUNT_CURRENT_L_LIMIT; |
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case hwmon_curr_crit: |
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return TMP51X_SHUNT_CURRENT_H_LIMIT; |
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} |
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break; |
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case hwmon_power: |
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switch (attr) { |
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case hwmon_power_input: |
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return TMP51X_POWER_RESULT; |
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case hwmon_power_crit_alarm: |
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return TMP51X_STATUS; |
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case hwmon_power_crit: |
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return TMP51X_POWER_LIMIT; |
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} |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr, |
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int channel) |
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{ |
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switch (type) { |
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case hwmon_temp: |
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switch (attr) { |
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case hwmon_temp_crit_alarm: |
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return TMP51X_TEMP_CRIT_ALARM[channel]; |
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} |
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break; |
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case hwmon_in: |
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switch (attr) { |
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case hwmon_in_lcrit_alarm: |
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return TMP51X_BUS_VOLTAGE_L_LIMIT_POS; |
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case hwmon_in_crit_alarm: |
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return TMP51X_BUS_VOLTAGE_H_LIMIT_POS; |
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} |
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break; |
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case hwmon_curr: |
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switch (attr) { |
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case hwmon_curr_lcrit_alarm: |
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return TMP51X_SHUNT_CURRENT_L_LIMIT_POS; |
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case hwmon_curr_crit_alarm: |
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return TMP51X_SHUNT_CURRENT_H_LIMIT_POS; |
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} |
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break; |
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case hwmon_power: |
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switch (attr) { |
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case hwmon_power_crit_alarm: |
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return TMP51X_POWER_LIMIT_POS; |
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} |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long *val) |
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{ |
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struct tmp51x_data *data = dev_get_drvdata(dev); |
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int ret; |
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u32 regval; |
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u8 pos = 0, reg = 0; |
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reg = tmp51x_get_reg(type, attr, channel); |
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if (reg == 0) |
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return -EOPNOTSUPP; |
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if (reg == TMP51X_STATUS) |
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pos = tmp51x_get_status_pos(type, attr, channel); |
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|
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ret = regmap_read(data->regmap, reg, ®val); |
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if (ret < 0) |
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return ret; |
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return tmp51x_get_value(data, reg, pos, regval, val); |
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} |
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static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long val) |
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{ |
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u8 reg = 0; |
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reg = tmp51x_get_reg(type, attr, channel); |
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if (reg == 0) |
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return -EOPNOTSUPP; |
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return tmp51x_set_value(dev_get_drvdata(dev), reg, val); |
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} |
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static umode_t tmp51x_is_visible(const void *_data, |
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enum hwmon_sensor_types type, u32 attr, |
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int channel) |
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{ |
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const struct tmp51x_data *data = _data; |
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|
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switch (type) { |
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case hwmon_temp: |
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if (data->id == tmp512 && channel == 4) |
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return 0; |
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switch (attr) { |
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case hwmon_temp_input: |
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case hwmon_temp_crit_alarm: |
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return 0444; |
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case hwmon_temp_crit: |
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return 0644; |
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case hwmon_temp_crit_hyst: |
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if (channel == 0) |
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return 0644; |
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return 0444; |
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} |
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break; |
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case hwmon_in: |
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switch (attr) { |
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case hwmon_in_input: |
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case hwmon_in_lcrit_alarm: |
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case hwmon_in_crit_alarm: |
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return 0444; |
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case hwmon_in_lcrit: |
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case hwmon_in_crit: |
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return 0644; |
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} |
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break; |
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case hwmon_curr: |
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if (!data->shunt_uohms) |
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return 0; |
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|
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switch (attr) { |
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case hwmon_curr_input: |
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case hwmon_curr_lcrit_alarm: |
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case hwmon_curr_crit_alarm: |
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return 0444; |
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case hwmon_curr_lcrit: |
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case hwmon_curr_crit: |
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return 0644; |
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} |
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break; |
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case hwmon_power: |
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if (!data->shunt_uohms) |
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return 0; |
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|
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switch (attr) { |
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case hwmon_power_input: |
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case hwmon_power_crit_alarm: |
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return 0444; |
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case hwmon_power_crit: |
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return 0644; |
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} |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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|
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static const struct hwmon_channel_info *tmp51x_info[] = { |
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HWMON_CHANNEL_INFO(temp, |
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HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | |
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HWMON_T_CRIT_HYST, |
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HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | |
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HWMON_T_CRIT_HYST, |
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HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | |
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HWMON_T_CRIT_HYST, |
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HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM | |
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HWMON_T_CRIT_HYST), |
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HWMON_CHANNEL_INFO(in, |
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HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM | |
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HWMON_I_CRIT | HWMON_I_CRIT_ALARM), |
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HWMON_CHANNEL_INFO(curr, |
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HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM | |
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HWMON_C_CRIT | HWMON_C_CRIT_ALARM, |
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HWMON_C_INPUT), |
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HWMON_CHANNEL_INFO(power, |
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HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM), |
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NULL |
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}; |
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|
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static const struct hwmon_ops tmp51x_hwmon_ops = { |
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.is_visible = tmp51x_is_visible, |
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.read = tmp51x_read, |
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.write = tmp51x_write, |
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}; |
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|
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static const struct hwmon_chip_info tmp51x_chip_info = { |
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.ops = &tmp51x_hwmon_ops, |
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.info = tmp51x_info, |
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}; |
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|
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/* |
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* Calibrate the tmp51x following the datasheet method |
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*/ |
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static int tmp51x_calibrate(struct tmp51x_data *data) |
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{ |
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int vshunt_max = data->pga_gain * 40; |
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u64 max_curr_ma; |
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u32 div; |
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|
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/* |
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* If shunt_uohms is equal to 0, the calibration should be set to 0. |
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* The consequence will be that the current and power measurement engine |
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* of the sensor will not work. Temperature and voltage sensing will |
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* continue to work. |
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*/ |
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if (data->shunt_uohms == 0) |
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return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0); |
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|
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max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * 1000 * 1000, |
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data->shunt_uohms); |
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|
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/* |
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* Calculate the minimal bit resolution for the current and the power. |
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* Those values will be used during register interpretation. |
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*/ |
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data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * 1000, 32767); |
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data->pwr_lsb_uw = 20 * data->curr_lsb_ua; |
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|
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div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, |
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1000 * 1000); |
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|
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return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, |
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DIV_ROUND_CLOSEST(40960, div)); |
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} |
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|
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/* |
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* Initialize the configuration and calibration registers. |
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*/ |
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static int tmp51x_init(struct tmp51x_data *data) |
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{ |
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unsigned int regval; |
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int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG, |
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data->shunt_config); |
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if (ret < 0) |
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return ret; |
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|
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ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config); |
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if (ret < 0) |
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return ret; |
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|
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// nFactor configuration |
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ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1, |
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TMP51X_NFACTOR_MASK, data->nfactor[0] << 8); |
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if (ret < 0) |
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return ret; |
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|
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ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2, |
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data->nfactor[1] << 8); |
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if (ret < 0) |
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return ret; |
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|
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if (data->id == tmp513) { |
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ret = regmap_write(data->regmap, TMP513_N_FACTOR_3, |
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data->nfactor[2] << 8); |
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if (ret < 0) |
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return ret; |
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} |
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|
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ret = tmp51x_calibrate(data); |
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if (ret < 0) |
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return ret; |
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|
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// Read the status register before using as the datasheet propose |
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return regmap_read(data->regmap, TMP51X_STATUS, ®val); |
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} |
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|
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static const struct i2c_device_id tmp51x_id[] = { |
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{ "tmp512", tmp512 }, |
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{ "tmp513", tmp513 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tmp51x_id); |
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|
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static const struct of_device_id tmp51x_of_match[] = { |
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{ |
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.compatible = "ti,tmp512", |
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.data = (void *)tmp512 |
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}, |
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{ |
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.compatible = "ti,tmp513", |
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.data = (void *)tmp513 |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, tmp51x_of_match); |
|
|
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static int tmp51x_vbus_range_to_reg(struct device *dev, |
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struct tmp51x_data *data) |
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{ |
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if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) { |
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data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK; |
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} else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) { |
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data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK; |
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} else { |
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dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n", |
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data->vbus_range_uvolt); |
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return -EINVAL; |
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} |
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return 0; |
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} |
|
|
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static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data) |
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{ |
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if (data->pga_gain == 8) { |
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data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK; |
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} else if (data->pga_gain == 4) { |
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data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK; |
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} else if (data->pga_gain == 2) { |
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data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK; |
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} else if (data->pga_gain == 1) { |
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data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK; |
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} else { |
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dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain); |
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return -EINVAL; |
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} |
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return 0; |
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} |
|
|
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static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data) |
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{ |
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int ret; |
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u32 nfactor[3]; |
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u32 val; |
|
|
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ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val); |
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data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT; |
|
|
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ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val); |
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data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT; |
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ret = tmp51x_vbus_range_to_reg(dev, data); |
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if (ret < 0) |
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return ret; |
|
|
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ret = device_property_read_u32(dev, "ti,pga-gain", &val); |
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data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT; |
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ret = tmp51x_pga_gain_to_reg(dev, data); |
|
if (ret < 0) |
|
return ret; |
|
|
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ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor, |
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(data->id == tmp513) ? 3 : 2); |
|
if (ret >= 0) |
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memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2); |
|
|
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// Check if shunt value is compatible with pga-gain |
|
if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) { |
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dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n", |
|
data->shunt_uohms, data->pga_gain); |
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return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
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static void tmp51x_use_default(struct tmp51x_data *data) |
|
{ |
|
data->vbus_range_uvolt = TMP51X_VBUS_RANGE_DEFAULT; |
|
data->pga_gain = TMP51X_PGA_DEFAULT; |
|
data->shunt_uohms = TMP51X_SHUNT_VALUE_DEFAULT; |
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} |
|
|
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static int tmp51x_configure(struct device *dev, struct tmp51x_data *data) |
|
{ |
|
data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT; |
|
data->temp_config = (data->id == tmp513) ? |
|
TMP513_TEMP_CONFIG_DEFAULT : TMP512_TEMP_CONFIG_DEFAULT; |
|
|
|
if (dev->of_node) |
|
return tmp51x_read_properties(dev, data); |
|
|
|
tmp51x_use_default(data); |
|
|
|
return 0; |
|
} |
|
|
|
static int tmp51x_probe(struct i2c_client *client) |
|
{ |
|
struct device *dev = &client->dev; |
|
struct tmp51x_data *data; |
|
struct device *hwmon_dev; |
|
int ret; |
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
if (client->dev.of_node) |
|
data->id = (enum tmp51x_ids)device_get_match_data(&client->dev); |
|
else |
|
data->id = i2c_match_id(tmp51x_id, client)->driver_data; |
|
|
|
ret = tmp51x_configure(dev, data); |
|
if (ret < 0) { |
|
dev_err(dev, "error configuring the device: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config); |
|
if (IS_ERR(data->regmap)) { |
|
dev_err(dev, "failed to allocate register map\n"); |
|
return PTR_ERR(data->regmap); |
|
} |
|
|
|
ret = tmp51x_init(data); |
|
if (ret < 0) { |
|
dev_err(dev, "error configuring the device: %d\n", ret); |
|
return -ENODEV; |
|
} |
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
|
data, |
|
&tmp51x_chip_info, |
|
NULL); |
|
if (IS_ERR(hwmon_dev)) |
|
return PTR_ERR(hwmon_dev); |
|
|
|
dev_dbg(dev, "power monitor %s\n", client->name); |
|
|
|
return 0; |
|
} |
|
|
|
static struct i2c_driver tmp51x_driver = { |
|
.driver = { |
|
.name = "tmp51x", |
|
.of_match_table = of_match_ptr(tmp51x_of_match), |
|
}, |
|
.probe_new = tmp51x_probe, |
|
.id_table = tmp51x_id, |
|
}; |
|
|
|
module_i2c_driver(tmp51x_driver); |
|
|
|
MODULE_AUTHOR("Eric Tremblay <[email protected]>"); |
|
MODULE_DESCRIPTION("tmp51x driver"); |
|
MODULE_LICENSE("GPL");
|
|
|