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279 lines
7.3 KiB
279 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for Linear Technology LTC2990 power monitor |
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* |
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* Copyright (C) 2014 Topic Embedded Products |
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* Author: Mike Looijmans <[email protected]> |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/err.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/i2c.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/property.h> |
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#define LTC2990_STATUS 0x00 |
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#define LTC2990_CONTROL 0x01 |
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#define LTC2990_TRIGGER 0x02 |
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#define LTC2990_TINT_MSB 0x04 |
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#define LTC2990_V1_MSB 0x06 |
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#define LTC2990_V2_MSB 0x08 |
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#define LTC2990_V3_MSB 0x0A |
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#define LTC2990_V4_MSB 0x0C |
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#define LTC2990_VCC_MSB 0x0E |
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#define LTC2990_IN0 BIT(0) |
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#define LTC2990_IN1 BIT(1) |
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#define LTC2990_IN2 BIT(2) |
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#define LTC2990_IN3 BIT(3) |
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#define LTC2990_IN4 BIT(4) |
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#define LTC2990_CURR1 BIT(5) |
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#define LTC2990_CURR2 BIT(6) |
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#define LTC2990_TEMP1 BIT(7) |
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#define LTC2990_TEMP2 BIT(8) |
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#define LTC2990_TEMP3 BIT(9) |
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#define LTC2990_NONE 0 |
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#define LTC2990_ALL GENMASK(9, 0) |
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#define LTC2990_MODE0_SHIFT 0 |
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#define LTC2990_MODE0_MASK GENMASK(2, 0) |
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#define LTC2990_MODE1_SHIFT 3 |
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#define LTC2990_MODE1_MASK GENMASK(1, 0) |
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/* Enabled measurements for mode bits 2..0 */ |
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static const int ltc2990_attrs_ena_0[] = { |
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LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3, |
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LTC2990_CURR1 | LTC2990_TEMP3, |
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LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4, |
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LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4, |
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LTC2990_TEMP2 | LTC2990_CURR2, |
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LTC2990_TEMP2 | LTC2990_TEMP3, |
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LTC2990_CURR1 | LTC2990_CURR2, |
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LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4 |
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}; |
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/* Enabled measurements for mode bits 4..3 */ |
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static const int ltc2990_attrs_ena_1[] = { |
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LTC2990_NONE, |
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LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1, |
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LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2, |
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LTC2990_ALL |
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}; |
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struct ltc2990_data { |
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struct i2c_client *i2c; |
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u32 mode[2]; |
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}; |
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/* Return the converted value from the given register in uV or mC */ |
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static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result) |
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{ |
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int val; |
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u8 reg; |
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switch (index) { |
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case LTC2990_IN0: |
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reg = LTC2990_VCC_MSB; |
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break; |
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case LTC2990_IN1: |
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case LTC2990_CURR1: |
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case LTC2990_TEMP2: |
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reg = LTC2990_V1_MSB; |
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break; |
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case LTC2990_IN2: |
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reg = LTC2990_V2_MSB; |
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break; |
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case LTC2990_IN3: |
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case LTC2990_CURR2: |
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case LTC2990_TEMP3: |
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reg = LTC2990_V3_MSB; |
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break; |
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case LTC2990_IN4: |
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reg = LTC2990_V4_MSB; |
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break; |
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case LTC2990_TEMP1: |
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reg = LTC2990_TINT_MSB; |
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break; |
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default: |
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return -EINVAL; |
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} |
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val = i2c_smbus_read_word_swapped(i2c, reg); |
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if (unlikely(val < 0)) |
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return val; |
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switch (index) { |
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case LTC2990_TEMP1: |
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case LTC2990_TEMP2: |
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case LTC2990_TEMP3: |
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/* temp, 0.0625 degrees/LSB */ |
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*result = sign_extend32(val, 12) * 1000 / 16; |
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break; |
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case LTC2990_CURR1: |
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case LTC2990_CURR2: |
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/* Vx-Vy, 19.42uV/LSB */ |
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*result = sign_extend32(val, 14) * 1942 / 100; |
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break; |
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case LTC2990_IN0: |
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/* Vcc, 305.18uV/LSB, 2.5V offset */ |
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*result = sign_extend32(val, 14) * 30518 / (100 * 1000) + 2500; |
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break; |
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case LTC2990_IN1: |
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case LTC2990_IN2: |
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case LTC2990_IN3: |
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case LTC2990_IN4: |
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/* Vx, 305.18uV/LSB */ |
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*result = sign_extend32(val, 14) * 30518 / (100 * 1000); |
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break; |
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default: |
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return -EINVAL; /* won't happen, keep compiler happy */ |
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} |
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return 0; |
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} |
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static ssize_t ltc2990_value_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct ltc2990_data *data = dev_get_drvdata(dev); |
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int value; |
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int ret; |
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ret = ltc2990_get_value(data->i2c, attr->index, &value); |
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if (unlikely(ret < 0)) |
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return ret; |
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return sysfs_emit(buf, "%d\n", value); |
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} |
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static umode_t ltc2990_attrs_visible(struct kobject *kobj, |
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struct attribute *a, int n) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct ltc2990_data *data = dev_get_drvdata(dev); |
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struct device_attribute *da = |
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container_of(a, struct device_attribute, attr); |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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int attrs_mask = LTC2990_IN0 | LTC2990_TEMP1 | |
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(ltc2990_attrs_ena_0[data->mode[0]] & |
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ltc2990_attrs_ena_1[data->mode[1]]); |
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if (attr->index & attrs_mask) |
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return a->mode; |
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return 0; |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, ltc2990_value, LTC2990_TEMP1); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, ltc2990_value, LTC2990_TEMP2); |
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static SENSOR_DEVICE_ATTR_RO(temp3_input, ltc2990_value, LTC2990_TEMP3); |
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static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2990_value, LTC2990_CURR1); |
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static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc2990_value, LTC2990_CURR2); |
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static SENSOR_DEVICE_ATTR_RO(in0_input, ltc2990_value, LTC2990_IN0); |
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static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2990_value, LTC2990_IN1); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2990_value, LTC2990_IN2); |
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static SENSOR_DEVICE_ATTR_RO(in3_input, ltc2990_value, LTC2990_IN3); |
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static SENSOR_DEVICE_ATTR_RO(in4_input, ltc2990_value, LTC2990_IN4); |
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static struct attribute *ltc2990_attrs[] = { |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp2_input.dev_attr.attr, |
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&sensor_dev_attr_temp3_input.dev_attr.attr, |
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&sensor_dev_attr_curr1_input.dev_attr.attr, |
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&sensor_dev_attr_curr2_input.dev_attr.attr, |
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&sensor_dev_attr_in0_input.dev_attr.attr, |
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&sensor_dev_attr_in1_input.dev_attr.attr, |
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&sensor_dev_attr_in2_input.dev_attr.attr, |
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&sensor_dev_attr_in3_input.dev_attr.attr, |
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&sensor_dev_attr_in4_input.dev_attr.attr, |
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NULL, |
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}; |
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static const struct attribute_group ltc2990_group = { |
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.attrs = ltc2990_attrs, |
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.is_visible = ltc2990_attrs_visible, |
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}; |
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__ATTRIBUTE_GROUPS(ltc2990); |
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static int ltc2990_i2c_probe(struct i2c_client *i2c) |
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{ |
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int ret; |
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struct device *hwmon_dev; |
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struct ltc2990_data *data; |
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if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
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I2C_FUNC_SMBUS_WORD_DATA)) |
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return -ENODEV; |
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data = devm_kzalloc(&i2c->dev, sizeof(struct ltc2990_data), GFP_KERNEL); |
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if (unlikely(!data)) |
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return -ENOMEM; |
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data->i2c = i2c; |
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if (dev_fwnode(&i2c->dev)) { |
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ret = device_property_read_u32_array(&i2c->dev, |
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"lltc,meas-mode", |
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data->mode, 2); |
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if (ret < 0) |
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return ret; |
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if (data->mode[0] & ~LTC2990_MODE0_MASK || |
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data->mode[1] & ~LTC2990_MODE1_MASK) |
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return -EINVAL; |
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} else { |
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ret = i2c_smbus_read_byte_data(i2c, LTC2990_CONTROL); |
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if (ret < 0) |
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return ret; |
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data->mode[0] = ret >> LTC2990_MODE0_SHIFT & LTC2990_MODE0_MASK; |
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data->mode[1] = ret >> LTC2990_MODE1_SHIFT & LTC2990_MODE1_MASK; |
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} |
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/* Setup continuous mode */ |
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ret = i2c_smbus_write_byte_data(i2c, LTC2990_CONTROL, |
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data->mode[0] << LTC2990_MODE0_SHIFT | |
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data->mode[1] << LTC2990_MODE1_SHIFT); |
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if (ret < 0) { |
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dev_err(&i2c->dev, "Error: Failed to set control mode.\n"); |
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return ret; |
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} |
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/* Trigger once to start continuous conversion */ |
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ret = i2c_smbus_write_byte_data(i2c, LTC2990_TRIGGER, 1); |
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if (ret < 0) { |
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dev_err(&i2c->dev, "Error: Failed to start acquisition.\n"); |
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return ret; |
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} |
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hwmon_dev = devm_hwmon_device_register_with_groups(&i2c->dev, |
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i2c->name, |
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data, |
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ltc2990_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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static const struct i2c_device_id ltc2990_i2c_id[] = { |
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{ "ltc2990", 0 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, ltc2990_i2c_id); |
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static struct i2c_driver ltc2990_i2c_driver = { |
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.driver = { |
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.name = "ltc2990", |
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}, |
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.probe_new = ltc2990_i2c_probe, |
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.id_table = ltc2990_i2c_id, |
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}; |
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module_i2c_driver(ltc2990_i2c_driver); |
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MODULE_DESCRIPTION("LTC2990 Sensor Driver"); |
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MODULE_AUTHOR("Topic Embedded Products"); |
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MODULE_LICENSE("GPL v2");
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