761 lines
20 KiB
C
761 lines
20 KiB
C
// 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 <etremblay@distech-controls.com>
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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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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/device.h>
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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/math.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/units.h>
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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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// 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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// Common attrs, and NULL
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#define TMP51X_MANUFACTURER_ID 0x55FF
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#define TMP512_DEVICE_ID 0x22FF
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#define TMP513_DEVICE_ID 0x23FF
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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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// 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 (32 * MICRO)
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#define TMP51X_VBUS_RANGE_16V (16 * MICRO)
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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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#define TMP512_MAX_CHANNELS 3
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#define TMP513_MAX_CHANNELS 4
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#define TMP51X_TEMP_CONFIG_CONV_RATE GENMASK(9, 7)
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#define TMP51X_TEMP_CONFIG_RC BIT(10)
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#define TMP51X_TEMP_CHANNEL_MASK(n) (GENMASK((n) - 1, 0) << 11)
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#define TMP51X_TEMP_CONFIG_CONT BIT(15)
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#define TMP51X_TEMP_CONFIG_DEFAULT(n) \
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(TMP51X_TEMP_CHANNEL_MASK(n) | TMP51X_TEMP_CONFIG_CONT | \
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TMP51X_TEMP_CONFIG_CONV_RATE | TMP51X_TEMP_CONFIG_RC)
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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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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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u8 max_channels;
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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 * 10 * MILLI, 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, MILLI);
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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, 10 * MILLI);
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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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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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switch (type) {
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case hwmon_temp:
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if (channel >= data->max_channels)
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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;
|
|
}
|
|
break;
|
|
case hwmon_in:
|
|
switch (attr) {
|
|
case hwmon_in_input:
|
|
case hwmon_in_lcrit_alarm:
|
|
case hwmon_in_crit_alarm:
|
|
return 0444;
|
|
case hwmon_in_lcrit:
|
|
case hwmon_in_crit:
|
|
return 0644;
|
|
}
|
|
break;
|
|
case hwmon_curr:
|
|
if (!data->shunt_uohms)
|
|
return 0;
|
|
|
|
switch (attr) {
|
|
case hwmon_curr_input:
|
|
case hwmon_curr_lcrit_alarm:
|
|
case hwmon_curr_crit_alarm:
|
|
return 0444;
|
|
case hwmon_curr_lcrit:
|
|
case hwmon_curr_crit:
|
|
return 0644;
|
|
}
|
|
break;
|
|
case hwmon_power:
|
|
if (!data->shunt_uohms)
|
|
return 0;
|
|
|
|
switch (attr) {
|
|
case hwmon_power_input:
|
|
case hwmon_power_crit_alarm:
|
|
return 0444;
|
|
case hwmon_power_crit:
|
|
return 0644;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwmon_channel_info * const tmp51x_info[] = {
|
|
HWMON_CHANNEL_INFO(temp,
|
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
|
|
HWMON_T_CRIT_HYST,
|
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
|
|
HWMON_T_CRIT_HYST,
|
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
|
|
HWMON_T_CRIT_HYST,
|
|
HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_ALARM |
|
|
HWMON_T_CRIT_HYST),
|
|
HWMON_CHANNEL_INFO(in,
|
|
HWMON_I_INPUT | HWMON_I_LCRIT | HWMON_I_LCRIT_ALARM |
|
|
HWMON_I_CRIT | HWMON_I_CRIT_ALARM),
|
|
HWMON_CHANNEL_INFO(curr,
|
|
HWMON_C_INPUT | HWMON_C_LCRIT | HWMON_C_LCRIT_ALARM |
|
|
HWMON_C_CRIT | HWMON_C_CRIT_ALARM,
|
|
HWMON_C_INPUT),
|
|
HWMON_CHANNEL_INFO(power,
|
|
HWMON_P_INPUT | HWMON_P_CRIT | HWMON_P_CRIT_ALARM),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops tmp51x_hwmon_ops = {
|
|
.is_visible = tmp51x_is_visible,
|
|
.read = tmp51x_read,
|
|
.write = tmp51x_write,
|
|
};
|
|
|
|
static const struct hwmon_chip_info tmp51x_chip_info = {
|
|
.ops = &tmp51x_hwmon_ops,
|
|
.info = tmp51x_info,
|
|
};
|
|
|
|
/*
|
|
* Calibrate the tmp51x following the datasheet method
|
|
*/
|
|
static int tmp51x_calibrate(struct tmp51x_data *data)
|
|
{
|
|
int vshunt_max = data->pga_gain * 40;
|
|
u64 max_curr_ma;
|
|
u32 div;
|
|
|
|
/*
|
|
* If shunt_uohms is equal to 0, the calibration should be set to 0.
|
|
* The consequence will be that the current and power measurement engine
|
|
* of the sensor will not work. Temperature and voltage sensing will
|
|
* continue to work.
|
|
*/
|
|
if (data->shunt_uohms == 0)
|
|
return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION, 0);
|
|
|
|
max_curr_ma = DIV_ROUND_CLOSEST_ULL(vshunt_max * MICRO, data->shunt_uohms);
|
|
|
|
/*
|
|
* Calculate the minimal bit resolution for the current and the power.
|
|
* Those values will be used during register interpretation.
|
|
*/
|
|
data->curr_lsb_ua = DIV_ROUND_CLOSEST_ULL(max_curr_ma * MILLI, 32767);
|
|
data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
|
|
|
|
div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms, MICRO);
|
|
|
|
return regmap_write(data->regmap, TMP51X_SHUNT_CALIBRATION,
|
|
DIV_ROUND_CLOSEST(40960, div));
|
|
}
|
|
|
|
/*
|
|
* Initialize the configuration and calibration registers.
|
|
*/
|
|
static int tmp51x_init(struct tmp51x_data *data)
|
|
{
|
|
unsigned int regval;
|
|
int ret = regmap_write(data->regmap, TMP51X_SHUNT_CONFIG,
|
|
data->shunt_config);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_write(data->regmap, TMP51X_TEMP_CONFIG, data->temp_config);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
// nFactor configuration
|
|
ret = regmap_update_bits(data->regmap, TMP51X_N_FACTOR_AND_HYST_1,
|
|
TMP51X_NFACTOR_MASK, data->nfactor[0] << 8);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_write(data->regmap, TMP51X_N_FACTOR_2,
|
|
data->nfactor[1] << 8);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (data->max_channels == TMP513_MAX_CHANNELS) {
|
|
ret = regmap_write(data->regmap, TMP513_N_FACTOR_3,
|
|
data->nfactor[2] << 8);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = tmp51x_calibrate(data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
// Read the status register before using as the datasheet propose
|
|
return regmap_read(data->regmap, TMP51X_STATUS, ®val);
|
|
}
|
|
|
|
static const struct i2c_device_id tmp51x_id[] = {
|
|
{ "tmp512", TMP512_MAX_CHANNELS },
|
|
{ "tmp513", TMP513_MAX_CHANNELS },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tmp51x_id);
|
|
|
|
static const struct of_device_id tmp51x_of_match[] = {
|
|
{ .compatible = "ti,tmp512", .data = (void *)TMP512_MAX_CHANNELS },
|
|
{ .compatible = "ti,tmp513", .data = (void *)TMP513_MAX_CHANNELS },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tmp51x_of_match);
|
|
|
|
static int tmp51x_vbus_range_to_reg(struct device *dev,
|
|
struct tmp51x_data *data)
|
|
{
|
|
if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) {
|
|
data->shunt_config |= TMP51X_BUS_VOLTAGE_MASK;
|
|
} else if (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_16V) {
|
|
data->shunt_config &= ~TMP51X_BUS_VOLTAGE_MASK;
|
|
} else {
|
|
return dev_err_probe(dev, -EINVAL,
|
|
"ti,bus-range-microvolt is invalid: %u\n",
|
|
data->vbus_range_uvolt);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tmp51x_pga_gain_to_reg(struct device *dev, struct tmp51x_data *data)
|
|
{
|
|
if (data->pga_gain == 8) {
|
|
data->shunt_config |= CURRENT_SENSE_VOLTAGE_320_MASK;
|
|
} else if (data->pga_gain == 4) {
|
|
data->shunt_config |= CURRENT_SENSE_VOLTAGE_160_MASK;
|
|
} else if (data->pga_gain == 2) {
|
|
data->shunt_config |= CURRENT_SENSE_VOLTAGE_80_MASK;
|
|
} else if (data->pga_gain == 1) {
|
|
data->shunt_config |= CURRENT_SENSE_VOLTAGE_40_MASK;
|
|
} else {
|
|
return dev_err_probe(dev, -EINVAL,
|
|
"ti,pga-gain is invalid: %u\n", data->pga_gain);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms", &val);
|
|
data->shunt_uohms = (ret >= 0) ? val : TMP51X_SHUNT_VALUE_DEFAULT;
|
|
|
|
ret = device_property_read_u32(dev, "ti,bus-range-microvolt", &val);
|
|
data->vbus_range_uvolt = (ret >= 0) ? val : TMP51X_VBUS_RANGE_DEFAULT;
|
|
ret = tmp51x_vbus_range_to_reg(dev, data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = device_property_read_u32(dev, "ti,pga-gain", &val);
|
|
data->pga_gain = (ret >= 0) ? val : TMP51X_PGA_DEFAULT;
|
|
ret = tmp51x_pga_gain_to_reg(dev, data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
device_property_read_u32_array(dev, "ti,nfactor", data->nfactor,
|
|
data->max_channels - 1);
|
|
|
|
// Check if shunt value is compatible with pga-gain
|
|
if (data->shunt_uohms > data->pga_gain * 40 * MICRO) {
|
|
return dev_err_probe(dev, -EINVAL,
|
|
"shunt-resistor: %u too big for pga_gain: %u\n",
|
|
data->shunt_uohms, data->pga_gain);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int tmp51x_configure(struct device *dev, struct tmp51x_data *data)
|
|
{
|
|
data->shunt_config = TMP51X_SHUNT_CONFIG_DEFAULT;
|
|
data->temp_config = TMP51X_TEMP_CONFIG_DEFAULT(data->max_channels);
|
|
|
|
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;
|
|
|
|
data->max_channels = (uintptr_t)i2c_get_match_data(client);
|
|
|
|
ret = tmp51x_configure(dev, data);
|
|
if (ret < 0)
|
|
return dev_err_probe(dev, ret, "error configuring the device\n");
|
|
|
|
data->regmap = devm_regmap_init_i2c(client, &tmp51x_regmap_config);
|
|
if (IS_ERR(data->regmap))
|
|
return dev_err_probe(dev, PTR_ERR(data->regmap),
|
|
"failed to allocate register map\n");
|
|
|
|
ret = tmp51x_init(data);
|
|
if (ret < 0)
|
|
return dev_err_probe(dev, ret, "error configuring the device\n");
|
|
|
|
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 = tmp51x_of_match,
|
|
},
|
|
.probe = tmp51x_probe,
|
|
.id_table = tmp51x_id,
|
|
};
|
|
|
|
module_i2c_driver(tmp51x_driver);
|
|
|
|
MODULE_AUTHOR("Eric Tremblay <etremblay@distechcontrols.com>");
|
|
MODULE_DESCRIPTION("tmp51x driver");
|
|
MODULE_LICENSE("GPL");
|