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-rw-r--r--drivers/hwmon/tmp513.c771
1 files changed, 771 insertions, 0 deletions
diff --git a/drivers/hwmon/tmp513.c b/drivers/hwmon/tmp513.c
new file mode 100644
index 000000000..b9a93ee9c
--- /dev/null
+++ b/drivers/hwmon/tmp513.c
@@ -0,0 +1,771 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Texas Instruments TMP512, TMP513 power monitor chips
+ *
+ * TMP513:
+ * Thermal/Power Management with Triple Remote and
+ * Local Temperature Sensor and Current Shunt Monitor
+ * Datasheet: https://www.ti.com/lit/gpn/tmp513
+ *
+ * TMP512:
+ * Thermal/Power Management with Dual Remote
+ * and Local Temperature Sensor and Current Shunt Monitor
+ * Datasheet: https://www.ti.com/lit/gpn/tmp512
+ *
+ * Copyright (C) 2019 Eric Tremblay <etremblay@distech-controls.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/util_macros.h>
+
+// Common register definition
+#define TMP51X_SHUNT_CONFIG 0x00
+#define TMP51X_TEMP_CONFIG 0x01
+#define TMP51X_STATUS 0x02
+#define TMP51X_SMBUS_ALERT 0x03
+#define TMP51X_SHUNT_CURRENT_RESULT 0x04
+#define TMP51X_BUS_VOLTAGE_RESULT 0x05
+#define TMP51X_POWER_RESULT 0x06
+#define TMP51X_BUS_CURRENT_RESULT 0x07
+#define TMP51X_LOCAL_TEMP_RESULT 0x08
+#define TMP51X_REMOTE_TEMP_RESULT_1 0x09
+#define TMP51X_REMOTE_TEMP_RESULT_2 0x0A
+#define TMP51X_SHUNT_CURRENT_H_LIMIT 0x0C
+#define TMP51X_SHUNT_CURRENT_L_LIMIT 0x0D
+#define TMP51X_BUS_VOLTAGE_H_LIMIT 0x0E
+#define TMP51X_BUS_VOLTAGE_L_LIMIT 0x0F
+#define TMP51X_POWER_LIMIT 0x10
+#define TMP51X_LOCAL_TEMP_LIMIT 0x11
+#define TMP51X_REMOTE_TEMP_LIMIT_1 0x12
+#define TMP51X_REMOTE_TEMP_LIMIT_2 0x13
+#define TMP51X_SHUNT_CALIBRATION 0x15
+#define TMP51X_N_FACTOR_AND_HYST_1 0x16
+#define TMP51X_N_FACTOR_2 0x17
+#define TMP51X_MAN_ID_REG 0xFE
+#define TMP51X_DEVICE_ID_REG 0xFF
+
+// TMP513 specific register definition
+#define TMP513_REMOTE_TEMP_RESULT_3 0x0B
+#define TMP513_REMOTE_TEMP_LIMIT_3 0x14
+#define TMP513_N_FACTOR_3 0x18
+
+// Common attrs, and NULL
+#define TMP51X_MANUFACTURER_ID 0x55FF
+
+#define TMP512_DEVICE_ID 0x22FF
+#define TMP513_DEVICE_ID 0x23FF
+
+// Default config
+#define TMP51X_SHUNT_CONFIG_DEFAULT 0x399F
+#define TMP51X_SHUNT_VALUE_DEFAULT 1000
+#define TMP51X_VBUS_RANGE_DEFAULT TMP51X_VBUS_RANGE_32V
+#define TMP51X_PGA_DEFAULT 8
+#define TMP51X_MAX_REGISTER_ADDR 0xFF
+
+#define TMP512_TEMP_CONFIG_DEFAULT 0xBF80
+#define TMP513_TEMP_CONFIG_DEFAULT 0xFF80
+
+// Mask and shift
+#define CURRENT_SENSE_VOLTAGE_320_MASK 0x1800
+#define CURRENT_SENSE_VOLTAGE_160_MASK 0x1000
+#define CURRENT_SENSE_VOLTAGE_80_MASK 0x0800
+#define CURRENT_SENSE_VOLTAGE_40_MASK 0
+
+#define TMP51X_BUS_VOLTAGE_MASK 0x2000
+#define TMP51X_NFACTOR_MASK 0xFF00
+#define TMP51X_HYST_MASK 0x00FF
+
+#define TMP51X_BUS_VOLTAGE_SHIFT 3
+#define TMP51X_TEMP_SHIFT 3
+
+// Alarms
+#define TMP51X_SHUNT_CURRENT_H_LIMIT_POS 15
+#define TMP51X_SHUNT_CURRENT_L_LIMIT_POS 14
+#define TMP51X_BUS_VOLTAGE_H_LIMIT_POS 13
+#define TMP51X_BUS_VOLTAGE_L_LIMIT_POS 12
+#define TMP51X_POWER_LIMIT_POS 11
+#define TMP51X_LOCAL_TEMP_LIMIT_POS 10
+#define TMP51X_REMOTE_TEMP_LIMIT_1_POS 9
+#define TMP51X_REMOTE_TEMP_LIMIT_2_POS 8
+#define TMP513_REMOTE_TEMP_LIMIT_3_POS 7
+
+#define TMP51X_VBUS_RANGE_32V 32000000
+#define TMP51X_VBUS_RANGE_16V 16000000
+
+// Max and Min value
+#define MAX_BUS_VOLTAGE_32_LIMIT 32764
+#define MAX_BUS_VOLTAGE_16_LIMIT 16382
+
+// Max possible value is -256 to +256 but datasheet indicated -40 to 125.
+#define MAX_TEMP_LIMIT 125000
+#define MIN_TEMP_LIMIT -40000
+
+#define MAX_TEMP_HYST 127500
+
+static const u8 TMP51X_TEMP_INPUT[4] = {
+ TMP51X_LOCAL_TEMP_RESULT,
+ TMP51X_REMOTE_TEMP_RESULT_1,
+ TMP51X_REMOTE_TEMP_RESULT_2,
+ TMP513_REMOTE_TEMP_RESULT_3
+};
+
+static const u8 TMP51X_TEMP_CRIT[4] = {
+ TMP51X_LOCAL_TEMP_LIMIT,
+ TMP51X_REMOTE_TEMP_LIMIT_1,
+ TMP51X_REMOTE_TEMP_LIMIT_2,
+ TMP513_REMOTE_TEMP_LIMIT_3
+};
+
+static const u8 TMP51X_TEMP_CRIT_ALARM[4] = {
+ TMP51X_LOCAL_TEMP_LIMIT_POS,
+ TMP51X_REMOTE_TEMP_LIMIT_1_POS,
+ TMP51X_REMOTE_TEMP_LIMIT_2_POS,
+ TMP513_REMOTE_TEMP_LIMIT_3_POS
+};
+
+static const u8 TMP51X_TEMP_CRIT_HYST[4] = {
+ TMP51X_N_FACTOR_AND_HYST_1,
+ TMP51X_N_FACTOR_AND_HYST_1,
+ TMP51X_N_FACTOR_AND_HYST_1,
+ TMP51X_N_FACTOR_AND_HYST_1
+};
+
+static const u8 TMP51X_CURR_INPUT[2] = {
+ TMP51X_SHUNT_CURRENT_RESULT,
+ TMP51X_BUS_CURRENT_RESULT
+};
+
+static struct regmap_config tmp51x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = TMP51X_MAX_REGISTER_ADDR,
+};
+
+enum tmp51x_ids {
+ tmp512, tmp513
+};
+
+struct tmp51x_data {
+ u16 shunt_config;
+ u16 pga_gain;
+ u32 vbus_range_uvolt;
+
+ u16 temp_config;
+ u32 nfactor[3];
+
+ u32 shunt_uohms;
+
+ u32 curr_lsb_ua;
+ u32 pwr_lsb_uw;
+
+ enum tmp51x_ids id;
+ struct regmap *regmap;
+};
+
+// Set the shift based on the gain 8=4, 4=3, 2=2, 1=1
+static inline u8 tmp51x_get_pga_shift(struct tmp51x_data *data)
+{
+ return 5 - ffs(data->pga_gain);
+}
+
+static int tmp51x_get_value(struct tmp51x_data *data, u8 reg, u8 pos,
+ unsigned int regval, long *val)
+{
+ switch (reg) {
+ case TMP51X_STATUS:
+ *val = (regval >> pos) & 1;
+ break;
+ case TMP51X_SHUNT_CURRENT_RESULT:
+ case TMP51X_SHUNT_CURRENT_H_LIMIT:
+ case TMP51X_SHUNT_CURRENT_L_LIMIT:
+ /*
+ * The valus is read in voltage in the chip but reported as
+ * current to the user.
+ * 2's complement number shifted by one to four depending
+ * on the pga gain setting. 1lsb = 10uV
+ */
+ *val = sign_extend32(regval, 17 - tmp51x_get_pga_shift(data));
+ *val = DIV_ROUND_CLOSEST(*val * 10000, data->shunt_uohms);
+ break;
+ case TMP51X_BUS_VOLTAGE_RESULT:
+ case TMP51X_BUS_VOLTAGE_H_LIMIT:
+ case TMP51X_BUS_VOLTAGE_L_LIMIT:
+ // 1lsb = 4mV
+ *val = (regval >> TMP51X_BUS_VOLTAGE_SHIFT) * 4;
+ break;
+ case TMP51X_POWER_RESULT:
+ case TMP51X_POWER_LIMIT:
+ // Power = (current * BusVoltage) / 5000
+ *val = regval * data->pwr_lsb_uw;
+ break;
+ case TMP51X_BUS_CURRENT_RESULT:
+ // Current = (ShuntVoltage * CalibrationRegister) / 4096
+ *val = sign_extend32(regval, 16) * data->curr_lsb_ua;
+ *val = DIV_ROUND_CLOSEST(*val, 1000);
+ break;
+ case TMP51X_LOCAL_TEMP_RESULT:
+ case TMP51X_REMOTE_TEMP_RESULT_1:
+ case TMP51X_REMOTE_TEMP_RESULT_2:
+ case TMP513_REMOTE_TEMP_RESULT_3:
+ case TMP51X_LOCAL_TEMP_LIMIT:
+ case TMP51X_REMOTE_TEMP_LIMIT_1:
+ case TMP51X_REMOTE_TEMP_LIMIT_2:
+ case TMP513_REMOTE_TEMP_LIMIT_3:
+ // 1lsb = 0.0625 degrees centigrade
+ *val = sign_extend32(regval, 16) >> TMP51X_TEMP_SHIFT;
+ *val = DIV_ROUND_CLOSEST(*val * 625, 10);
+ break;
+ case TMP51X_N_FACTOR_AND_HYST_1:
+ // 1lsb = 0.5 degrees centigrade
+ *val = (regval & TMP51X_HYST_MASK) * 500;
+ break;
+ default:
+ // Programmer goofed
+ WARN_ON_ONCE(1);
+ *val = 0;
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static int tmp51x_set_value(struct tmp51x_data *data, u8 reg, long val)
+{
+ int regval, max_val;
+ u32 mask = 0;
+
+ switch (reg) {
+ case TMP51X_SHUNT_CURRENT_H_LIMIT:
+ case TMP51X_SHUNT_CURRENT_L_LIMIT:
+ /*
+ * The user enter current value and we convert it to
+ * voltage. 1lsb = 10uV
+ */
+ val = DIV_ROUND_CLOSEST(val * data->shunt_uohms, 10000);
+ max_val = U16_MAX >> tmp51x_get_pga_shift(data);
+ regval = clamp_val(val, -max_val, max_val);
+ break;
+ case TMP51X_BUS_VOLTAGE_H_LIMIT:
+ case TMP51X_BUS_VOLTAGE_L_LIMIT:
+ // 1lsb = 4mV
+ max_val = (data->vbus_range_uvolt == TMP51X_VBUS_RANGE_32V) ?
+ MAX_BUS_VOLTAGE_32_LIMIT : MAX_BUS_VOLTAGE_16_LIMIT;
+
+ val = clamp_val(DIV_ROUND_CLOSEST(val, 4), 0, max_val);
+ regval = val << TMP51X_BUS_VOLTAGE_SHIFT;
+ break;
+ case TMP51X_POWER_LIMIT:
+ regval = clamp_val(DIV_ROUND_CLOSEST(val, data->pwr_lsb_uw), 0,
+ U16_MAX);
+ break;
+ case TMP51X_LOCAL_TEMP_LIMIT:
+ case TMP51X_REMOTE_TEMP_LIMIT_1:
+ case TMP51X_REMOTE_TEMP_LIMIT_2:
+ case TMP513_REMOTE_TEMP_LIMIT_3:
+ // 1lsb = 0.0625 degrees centigrade
+ val = clamp_val(val, MIN_TEMP_LIMIT, MAX_TEMP_LIMIT);
+ regval = DIV_ROUND_CLOSEST(val * 10, 625) << TMP51X_TEMP_SHIFT;
+ break;
+ case TMP51X_N_FACTOR_AND_HYST_1:
+ // 1lsb = 0.5 degrees centigrade
+ val = clamp_val(val, 0, MAX_TEMP_HYST);
+ regval = DIV_ROUND_CLOSEST(val, 500);
+ mask = TMP51X_HYST_MASK;
+ break;
+ default:
+ // Programmer goofed
+ WARN_ON_ONCE(1);
+ return -EOPNOTSUPP;
+ }
+
+ if (mask == 0)
+ return regmap_write(data->regmap, reg, regval);
+ else
+ return regmap_update_bits(data->regmap, reg, mask, regval);
+}
+
+static u8 tmp51x_get_reg(enum hwmon_sensor_types type, u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ return TMP51X_TEMP_INPUT[channel];
+ case hwmon_temp_crit_alarm:
+ return TMP51X_STATUS;
+ case hwmon_temp_crit:
+ return TMP51X_TEMP_CRIT[channel];
+ case hwmon_temp_crit_hyst:
+ return TMP51X_TEMP_CRIT_HYST[channel];
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ return TMP51X_BUS_VOLTAGE_RESULT;
+ case hwmon_in_lcrit_alarm:
+ case hwmon_in_crit_alarm:
+ return TMP51X_STATUS;
+ case hwmon_in_lcrit:
+ return TMP51X_BUS_VOLTAGE_L_LIMIT;
+ case hwmon_in_crit:
+ return TMP51X_BUS_VOLTAGE_H_LIMIT;
+ }
+ break;
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ return TMP51X_CURR_INPUT[channel];
+ case hwmon_curr_lcrit_alarm:
+ case hwmon_curr_crit_alarm:
+ return TMP51X_STATUS;
+ case hwmon_curr_lcrit:
+ return TMP51X_SHUNT_CURRENT_L_LIMIT;
+ case hwmon_curr_crit:
+ return TMP51X_SHUNT_CURRENT_H_LIMIT;
+ }
+ break;
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_input:
+ return TMP51X_POWER_RESULT;
+ case hwmon_power_crit_alarm:
+ return TMP51X_STATUS;
+ case hwmon_power_crit:
+ return TMP51X_POWER_LIMIT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static u8 tmp51x_get_status_pos(enum hwmon_sensor_types type, u32 attr,
+ int channel)
+{
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_crit_alarm:
+ return TMP51X_TEMP_CRIT_ALARM[channel];
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_lcrit_alarm:
+ return TMP51X_BUS_VOLTAGE_L_LIMIT_POS;
+ case hwmon_in_crit_alarm:
+ return TMP51X_BUS_VOLTAGE_H_LIMIT_POS;
+ }
+ break;
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_lcrit_alarm:
+ return TMP51X_SHUNT_CURRENT_L_LIMIT_POS;
+ case hwmon_curr_crit_alarm:
+ return TMP51X_SHUNT_CURRENT_H_LIMIT_POS;
+ }
+ break;
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_crit_alarm:
+ return TMP51X_POWER_LIMIT_POS;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int tmp51x_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct tmp51x_data *data = dev_get_drvdata(dev);
+ int ret;
+ u32 regval;
+ u8 pos = 0, reg = 0;
+
+ reg = tmp51x_get_reg(type, attr, channel);
+ if (reg == 0)
+ return -EOPNOTSUPP;
+
+ if (reg == TMP51X_STATUS)
+ pos = tmp51x_get_status_pos(type, attr, channel);
+
+ ret = regmap_read(data->regmap, reg, &regval);
+ if (ret < 0)
+ return ret;
+
+ return tmp51x_get_value(data, reg, pos, regval, val);
+}
+
+static int tmp51x_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ u8 reg = 0;
+
+ reg = tmp51x_get_reg(type, attr, channel);
+ if (reg == 0)
+ return -EOPNOTSUPP;
+
+ return tmp51x_set_value(dev_get_drvdata(dev), reg, val);
+}
+
+static umode_t tmp51x_is_visible(const void *_data,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel)
+{
+ const struct tmp51x_data *data = _data;
+
+ switch (type) {
+ case hwmon_temp:
+ if (data->id == tmp512 && channel == 3)
+ return 0;
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_crit_alarm:
+ return 0444;
+ case hwmon_temp_crit:
+ return 0644;
+ case hwmon_temp_crit_hyst:
+ if (channel == 0)
+ return 0644;
+ 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 *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 * 1000 * 1000,
+ 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 * 1000, 32767);
+ data->pwr_lsb_uw = 20 * data->curr_lsb_ua;
+
+ div = DIV_ROUND_CLOSEST_ULL(data->curr_lsb_ua * data->shunt_uohms,
+ 1000 * 1000);
+
+ 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->id == tmp513) {
+ 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, &regval);
+}
+
+static const struct i2c_device_id tmp51x_id[] = {
+ { "tmp512", tmp512 },
+ { "tmp513", tmp513 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tmp51x_id);
+
+static const struct of_device_id tmp51x_of_match[] = {
+ {
+ .compatible = "ti,tmp512",
+ .data = (void *)tmp512
+ },
+ {
+ .compatible = "ti,tmp513",
+ .data = (void *)tmp513
+ },
+ { },
+};
+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 {
+ dev_err(dev, "ti,bus-range-microvolt is invalid: %u\n",
+ data->vbus_range_uvolt);
+ return -EINVAL;
+ }
+ 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 {
+ dev_err(dev, "ti,pga-gain is invalid: %u\n", data->pga_gain);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int tmp51x_read_properties(struct device *dev, struct tmp51x_data *data)
+{
+ int ret;
+ u32 nfactor[3];
+ 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;
+
+ ret = device_property_read_u32_array(dev, "ti,nfactor", nfactor,
+ (data->id == tmp513) ? 3 : 2);
+ if (ret >= 0)
+ memcpy(data->nfactor, nfactor, (data->id == tmp513) ? 3 : 2);
+
+ // Check if shunt value is compatible with pga-gain
+ if (data->shunt_uohms > data->pga_gain * 40 * 1000 * 1000) {
+ dev_err(dev, "shunt-resistor: %u too big for pga_gain: %u\n",
+ data->shunt_uohms, data->pga_gain);
+ return -EINVAL;
+ }
+
+ 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 = (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 = tmp51x_of_match,
+ },
+ .probe_new = 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 08:54:14 +0000