mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)andGuenter Roeck
4a9e6a9230
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify indention and usage of commas. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://lore.kernel.org/r/65b77bcd452752c36d866069cc5790b26d2bf8dc.1778688803.git.u.kleine-koenig@baylibre.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
280 lines
7.3 KiB
C
280 lines
7.3 KiB
C
// 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 <mike.looijmans@topic.nl>
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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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{ .name = "ltc2990" },
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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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