282 lines
7.3 KiB
C
282 lines
7.3 KiB
C
/*
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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 <mike.looijmans@topic.nl>
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*
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* License: GPLv2
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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/of.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 snprintf(buf, PAGE_SIZE, "%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 = container_of(kobj, struct device, 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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const struct i2c_device_id *id)
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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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struct device_node *of_node = i2c->dev.of_node;
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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 (of_node) {
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ret = of_property_read_u32_array(of_node, "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 = 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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