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>
222 lines
6.1 KiB
C
222 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Linear Technology LTC4222 Dual Hot Swap controller
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*
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* Copyright (c) 2014 Guenter Roeck
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/regmap.h>
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/* chip registers */
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#define LTC4222_CONTROL1 0xd0
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#define LTC4222_ALERT1 0xd1
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#define LTC4222_STATUS1 0xd2
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#define LTC4222_FAULT1 0xd3
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#define LTC4222_CONTROL2 0xd4
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#define LTC4222_ALERT2 0xd5
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#define LTC4222_STATUS2 0xd6
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#define LTC4222_FAULT2 0xd7
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#define LTC4222_SOURCE1 0xd8
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#define LTC4222_SOURCE2 0xda
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#define LTC4222_ADIN1 0xdc
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#define LTC4222_ADIN2 0xde
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#define LTC4222_SENSE1 0xe0
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#define LTC4222_SENSE2 0xe2
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#define LTC4222_ADC_CONTROL 0xe4
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/*
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* Fault register bits
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*/
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#define FAULT_OV BIT(0)
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#define FAULT_UV BIT(1)
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#define FAULT_OC BIT(2)
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#define FAULT_POWER_BAD BIT(3)
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#define FAULT_FET_BAD BIT(5)
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/* Return the voltage from the given register in mV or mA */
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static int ltc4222_get_value(struct device *dev, u8 reg)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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unsigned int val;
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u8 buf[2];
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int ret;
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ret = regmap_bulk_read(regmap, reg, buf, 2);
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if (ret < 0)
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return ret;
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val = ((buf[0] << 8) + buf[1]) >> 6;
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switch (reg) {
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case LTC4222_ADIN1:
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case LTC4222_ADIN2:
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/* 1.25 mV resolution. Convert to mV. */
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val = DIV_ROUND_CLOSEST(val * 5, 4);
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break;
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case LTC4222_SOURCE1:
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case LTC4222_SOURCE2:
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/* 31.25 mV resolution. Convert to mV. */
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val = DIV_ROUND_CLOSEST(val * 125, 4);
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break;
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case LTC4222_SENSE1:
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case LTC4222_SENSE2:
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/*
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* 62.5 uV resolution. Convert to current as measured with
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* an 1 mOhm sense resistor, in mA. If a different sense
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* resistor is installed, calculate the actual current by
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* dividing the reported current by the sense resistor value
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* in mOhm.
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*/
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val = DIV_ROUND_CLOSEST(val * 125, 2);
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break;
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default:
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return -EINVAL;
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}
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return val;
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}
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static ssize_t ltc4222_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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int value;
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value = ltc4222_get_value(dev, attr->index);
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if (value < 0)
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return value;
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return sysfs_emit(buf, "%d\n", value);
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}
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static ssize_t ltc4222_bool_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_2 *attr = to_sensor_dev_attr_2(da);
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struct regmap *regmap = dev_get_drvdata(dev);
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unsigned int fault;
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int ret;
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ret = regmap_read(regmap, attr->nr, &fault);
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if (ret < 0)
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return ret;
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fault &= attr->index;
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if (fault) /* Clear reported faults in chip register */
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regmap_update_bits(regmap, attr->nr, attr->index, 0);
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return sysfs_emit(buf, "%d\n", !!fault);
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}
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/* Voltages */
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static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4222_value, LTC4222_SOURCE1);
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static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4222_value, LTC4222_ADIN1);
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static SENSOR_DEVICE_ATTR_RO(in3_input, ltc4222_value, LTC4222_SOURCE2);
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static SENSOR_DEVICE_ATTR_RO(in4_input, ltc4222_value, LTC4222_ADIN2);
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/*
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* Voltage alarms
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* UV/OV faults are associated with the input voltage, and power bad and fet
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* faults are associated with the output voltage.
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*/
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static SENSOR_DEVICE_ATTR_2_RO(in1_min_alarm, ltc4222_bool, LTC4222_FAULT1,
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FAULT_UV);
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static SENSOR_DEVICE_ATTR_2_RO(in1_max_alarm, ltc4222_bool, LTC4222_FAULT1,
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FAULT_OV);
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static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, ltc4222_bool, LTC4222_FAULT1,
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FAULT_POWER_BAD | FAULT_FET_BAD);
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static SENSOR_DEVICE_ATTR_2_RO(in3_min_alarm, ltc4222_bool, LTC4222_FAULT2,
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FAULT_UV);
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static SENSOR_DEVICE_ATTR_2_RO(in3_max_alarm, ltc4222_bool, LTC4222_FAULT2,
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FAULT_OV);
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static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, ltc4222_bool, LTC4222_FAULT2,
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FAULT_POWER_BAD | FAULT_FET_BAD);
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/* Current (via sense resistor) */
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static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4222_value, LTC4222_SENSE1);
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static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc4222_value, LTC4222_SENSE2);
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/* Overcurrent alarm */
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static SENSOR_DEVICE_ATTR_2_RO(curr1_max_alarm, ltc4222_bool, LTC4222_FAULT1,
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FAULT_OC);
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static SENSOR_DEVICE_ATTR_2_RO(curr2_max_alarm, ltc4222_bool, LTC4222_FAULT2,
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FAULT_OC);
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static struct attribute *ltc4222_attrs[] = {
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in2_alarm.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in3_min_alarm.dev_attr.attr,
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&sensor_dev_attr_in3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in4_alarm.dev_attr.attr,
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&sensor_dev_attr_curr1_input.dev_attr.attr,
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&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_curr2_input.dev_attr.attr,
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&sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ltc4222);
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static const struct regmap_config ltc4222_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LTC4222_ADC_CONTROL,
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};
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static int ltc4222_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct regmap *regmap;
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regmap = devm_regmap_init_i2c(client, <c4222_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "failed to allocate register map\n");
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return PTR_ERR(regmap);
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}
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/* Clear faults */
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regmap_write(regmap, LTC4222_FAULT1, 0x00);
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regmap_write(regmap, LTC4222_FAULT2, 0x00);
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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regmap,
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ltc4222_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 ltc4222_id[] = {
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{ .name = "ltc4222" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ltc4222_id);
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static struct i2c_driver ltc4222_driver = {
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.driver = {
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.name = "ltc4222",
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},
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.probe = ltc4222_probe,
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.id_table = ltc4222_id,
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};
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module_i2c_driver(ltc4222_driver);
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MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
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MODULE_DESCRIPTION("LTC4222 driver");
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MODULE_LICENSE("GPL");
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