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![Paul Fertser](/assets/img/avatar_default.png)
We have bool so use it consistently in all the drivers. The following Coccinelle script was used: @@ identifier T; type t = { char, int }; @@ struct T { ... - t valid; + bool valid; ... } @@ identifier v; @@ ( - v->valid = 0 + v->valid = false | - v->valid = 1 + v->valid = true ) followed by sed to fixup the comments: sed '/bool valid;/{s/!=0/true/;s/zero/false/}' Few whitespace changes were fixed manually. All modified drivers were compile-tested. Signed-off-by: Paul Fertser <fercerpav@gmail.com> Link: https://lore.kernel.org/r/20210924195202.27917-1-fercerpav@gmail.com [groeck: Fixed up 'u8 valid' to 'boool valid' in atxp1.c] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Linear Technology LTC4151 High Voltage I2C Current
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* and Voltage Monitor
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*
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* Copyright (C) 2011 AppearTV AS
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*
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* Derived from:
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*
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* Driver for Linear Technology LTC4261 I2C Negative Voltage Hot
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* Swap Controller
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* Copyright (C) 2010 Ericsson AB.
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*
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* Datasheet: http://www.linear.com/docs/Datasheet/4151fc.pdf
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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/of.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.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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/* chip registers */
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#define LTC4151_SENSE_H 0x00
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#define LTC4151_SENSE_L 0x01
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#define LTC4151_VIN_H 0x02
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#define LTC4151_VIN_L 0x03
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#define LTC4151_ADIN_H 0x04
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#define LTC4151_ADIN_L 0x05
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struct ltc4151_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid;
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unsigned long last_updated; /* in jiffies */
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unsigned int shunt; /* in micro ohms */
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/* Registers */
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u8 regs[6];
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};
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static struct ltc4151_data *ltc4151_update_device(struct device *dev)
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{
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struct ltc4151_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct ltc4151_data *ret = data;
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mutex_lock(&data->update_lock);
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/*
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* The chip's A/D updates 6 times per second
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* (Conversion Rate 6 - 9 Hz)
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*/
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if (time_after(jiffies, data->last_updated + HZ / 6) || !data->valid) {
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int i;
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dev_dbg(&client->dev, "Starting ltc4151 update\n");
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/* Read all registers */
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for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
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int val;
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val = i2c_smbus_read_byte_data(client, i);
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if (unlikely(val < 0)) {
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dev_dbg(dev,
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"Failed to read ADC value: error %d\n",
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val);
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ret = ERR_PTR(val);
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goto abort;
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}
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data->regs[i] = val;
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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/* Return the voltage from the given register in mV */
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static int ltc4151_get_value(struct ltc4151_data *data, u8 reg)
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{
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u32 val;
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val = (data->regs[reg] << 4) + (data->regs[reg + 1] >> 4);
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switch (reg) {
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case LTC4151_ADIN_H:
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/* 500uV resolution. Convert to mV. */
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val = val * 500 / 1000;
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break;
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case LTC4151_SENSE_H:
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/*
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* 20uV resolution. Convert to current as measured with
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* a given sense resistor, in mA.
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*/
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val = val * 20 * 1000 / data->shunt;
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break;
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case LTC4151_VIN_H:
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/* 25 mV per increment */
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val = val * 25;
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break;
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default:
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/* If we get here, the developer messed up */
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WARN_ON_ONCE(1);
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val = 0;
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break;
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}
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return val;
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}
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static ssize_t ltc4151_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 ltc4151_data *data = ltc4151_update_device(dev);
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int value;
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if (IS_ERR(data))
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return PTR_ERR(data);
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value = ltc4151_get_value(data, attr->index);
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return sysfs_emit(buf, "%d\n", value);
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}
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/*
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* Input voltages.
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*/
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static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4151_value, LTC4151_VIN_H);
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static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4151_value, LTC4151_ADIN_H);
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/* Currents (via sense resistor) */
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static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4151_value, LTC4151_SENSE_H);
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/*
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* Finally, construct an array of pointers to members of the above objects,
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* as required for sysfs_create_group()
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*/
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static struct attribute *ltc4151_attrs[] = {
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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_curr1_input.dev_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(ltc4151);
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static int ltc4151_probe(struct i2c_client *client)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct device *dev = &client->dev;
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struct ltc4151_data *data;
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struct device *hwmon_dev;
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u32 shunt;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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if (of_property_read_u32(client->dev.of_node,
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"shunt-resistor-micro-ohms", &shunt))
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shunt = 1000; /* 1 mOhm if not set via DT */
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if (shunt == 0)
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return -EINVAL;
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data->shunt = shunt;
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data->client = client;
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mutex_init(&data->update_lock);
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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data,
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ltc4151_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 ltc4151_id[] = {
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{ "ltc4151", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ltc4151_id);
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static const struct of_device_id __maybe_unused ltc4151_match[] = {
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{ .compatible = "lltc,ltc4151" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ltc4151_match);
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/* This is the driver that will be inserted */
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static struct i2c_driver ltc4151_driver = {
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.driver = {
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.name = "ltc4151",
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.of_match_table = of_match_ptr(ltc4151_match),
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},
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.probe_new = ltc4151_probe,
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.id_table = ltc4151_id,
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};
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module_i2c_driver(ltc4151_driver);
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MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
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MODULE_DESCRIPTION("LTC4151 driver");
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MODULE_LICENSE("GPL");
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