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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * An hwmon driver for the Analog Devices AD7416/17/184 * Copyright (C) 2006-07 Tower Technologies5 *6 * Author: Alessandro Zummo <a.zummo@towertech.it>7 *8 * Based on lm75.c9 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>10 */11 12#include <linux/module.h>13#include <linux/jiffies.h>14#include <linux/i2c.h>15#include <linux/hwmon.h>16#include <linux/hwmon-sysfs.h>17#include <linux/err.h>18#include <linux/mutex.h>19#include <linux/of.h>20#include <linux/delay.h>21#include <linux/slab.h>22 23#include "lm75.h"24 25#define DRV_VERSION "0.4"26 27enum chips { ad7416, ad7417, ad7418 };28 29/* AD7418 registers */30#define AD7418_REG_TEMP_IN 0x0031#define AD7418_REG_CONF 0x0132#define AD7418_REG_TEMP_HYST 0x0233#define AD7418_REG_TEMP_OS 0x0334#define AD7418_REG_ADC 0x0435#define AD7418_REG_CONF2 0x0536 37#define AD7418_REG_ADC_CH(x) ((x) << 5)38#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)39 40static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,41 AD7418_REG_TEMP_HYST,42 AD7418_REG_TEMP_OS };43 44struct ad7418_data {45 struct i2c_client *client;46 enum chips type;47 struct mutex lock;48 int adc_max; /* number of ADC channels */49 bool valid;50 unsigned long last_updated; /* In jiffies */51 s16 temp[3]; /* Register values */52 u16 in[4];53};54 55static int ad7418_update_device(struct device *dev)56{57 struct ad7418_data *data = dev_get_drvdata(dev);58 struct i2c_client *client = data->client;59 s32 val;60 61 mutex_lock(&data->lock);62 63 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)64 || !data->valid) {65 u8 cfg;66 int i, ch;67 68 /* read config register and clear channel bits */69 val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);70 if (val < 0)71 goto abort;72 73 cfg = val;74 cfg &= 0x1F;75 76 val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF,77 cfg | AD7418_CH_TEMP);78 if (val < 0)79 goto abort;80 81 udelay(30);82 83 for (i = 0; i < 3; i++) {84 val = i2c_smbus_read_word_swapped(client,85 AD7418_REG_TEMP[i]);86 if (val < 0)87 goto abort;88 89 data->temp[i] = val;90 }91 92 for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {93 val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF,94 cfg | AD7418_REG_ADC_CH(ch));95 if (val < 0)96 goto abort;97 98 udelay(15);99 val = i2c_smbus_read_word_swapped(client,100 AD7418_REG_ADC);101 if (val < 0)102 goto abort;103 104 data->in[data->adc_max - 1 - i] = val;105 }106 107 /* restore old configuration value */108 val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF,109 cfg);110 if (val < 0)111 goto abort;112 113 data->last_updated = jiffies;114 data->valid = true;115 }116 117 mutex_unlock(&data->lock);118 return 0;119 120abort:121 data->valid = false;122 mutex_unlock(&data->lock);123 return val;124}125 126static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,127 char *buf)128{129 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);130 struct ad7418_data *data = dev_get_drvdata(dev);131 int ret;132 133 ret = ad7418_update_device(dev);134 if (ret < 0)135 return ret;136 137 return sprintf(buf, "%d\n",138 LM75_TEMP_FROM_REG(data->temp[attr->index]));139}140 141static ssize_t adc_show(struct device *dev, struct device_attribute *devattr,142 char *buf)143{144 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);145 struct ad7418_data *data = dev_get_drvdata(dev);146 int ret;147 148 ret = ad7418_update_device(dev);149 if (ret < 0)150 return ret;151 152 return sprintf(buf, "%d\n",153 ((data->in[attr->index] >> 6) * 2500 + 512) / 1024);154}155 156static ssize_t temp_store(struct device *dev,157 struct device_attribute *devattr, const char *buf,158 size_t count)159{160 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);161 struct ad7418_data *data = dev_get_drvdata(dev);162 struct i2c_client *client = data->client;163 long temp;164 int ret = kstrtol(buf, 10, &temp);165 166 if (ret < 0)167 return ret;168 169 mutex_lock(&data->lock);170 data->temp[attr->index] = LM75_TEMP_TO_REG(temp);171 i2c_smbus_write_word_swapped(client,172 AD7418_REG_TEMP[attr->index],173 data->temp[attr->index]);174 mutex_unlock(&data->lock);175 return count;176}177 178static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);179static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1);180static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2);181 182static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0);183static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1);184static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2);185static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3);186 187static struct attribute *ad7416_attrs[] = {188 &sensor_dev_attr_temp1_max.dev_attr.attr,189 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,190 &sensor_dev_attr_temp1_input.dev_attr.attr,191 NULL192};193ATTRIBUTE_GROUPS(ad7416);194 195static struct attribute *ad7417_attrs[] = {196 &sensor_dev_attr_temp1_max.dev_attr.attr,197 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,198 &sensor_dev_attr_temp1_input.dev_attr.attr,199 &sensor_dev_attr_in1_input.dev_attr.attr,200 &sensor_dev_attr_in2_input.dev_attr.attr,201 &sensor_dev_attr_in3_input.dev_attr.attr,202 &sensor_dev_attr_in4_input.dev_attr.attr,203 NULL204};205ATTRIBUTE_GROUPS(ad7417);206 207static struct attribute *ad7418_attrs[] = {208 &sensor_dev_attr_temp1_max.dev_attr.attr,209 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,210 &sensor_dev_attr_temp1_input.dev_attr.attr,211 &sensor_dev_attr_in1_input.dev_attr.attr,212 NULL213};214ATTRIBUTE_GROUPS(ad7418);215 216static void ad7418_init_client(struct i2c_client *client)217{218 struct ad7418_data *data = i2c_get_clientdata(client);219 220 int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);221 if (reg < 0) {222 dev_err(&client->dev, "cannot read configuration register\n");223 } else {224 dev_info(&client->dev, "configuring for mode 1\n");225 i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);226 227 if (data->type == ad7417 || data->type == ad7418)228 i2c_smbus_write_byte_data(client,229 AD7418_REG_CONF2, 0x00);230 }231}232 233static int ad7418_probe(struct i2c_client *client)234{235 struct device *dev = &client->dev;236 struct i2c_adapter *adapter = client->adapter;237 struct ad7418_data *data;238 struct device *hwmon_dev;239 const struct attribute_group **attr_groups = NULL;240 241 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |242 I2C_FUNC_SMBUS_WORD_DATA))243 return -EOPNOTSUPP;244 245 data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL);246 if (!data)247 return -ENOMEM;248 249 i2c_set_clientdata(client, data);250 251 mutex_init(&data->lock);252 data->client = client;253 data->type = (uintptr_t)i2c_get_match_data(client);254 255 switch (data->type) {256 case ad7416:257 data->adc_max = 0;258 attr_groups = ad7416_groups;259 break;260 261 case ad7417:262 data->adc_max = 4;263 attr_groups = ad7417_groups;264 break;265 266 case ad7418:267 data->adc_max = 1;268 attr_groups = ad7418_groups;269 break;270 }271 272 dev_info(dev, "%s chip found\n", client->name);273 274 /* Initialize the AD7418 chip */275 ad7418_init_client(client);276 277 hwmon_dev = devm_hwmon_device_register_with_groups(dev,278 client->name,279 data, attr_groups);280 return PTR_ERR_OR_ZERO(hwmon_dev);281}282 283static const struct i2c_device_id ad7418_id[] = {284 { "ad7416", ad7416 },285 { "ad7417", ad7417 },286 { "ad7418", ad7418 },287 { }288};289MODULE_DEVICE_TABLE(i2c, ad7418_id);290 291static const struct of_device_id ad7418_dt_ids[] = {292 { .compatible = "adi,ad7416", .data = (void *)ad7416, },293 { .compatible = "adi,ad7417", .data = (void *)ad7417, },294 { .compatible = "adi,ad7418", .data = (void *)ad7418, },295 { }296};297MODULE_DEVICE_TABLE(of, ad7418_dt_ids);298 299static struct i2c_driver ad7418_driver = {300 .driver = {301 .name = "ad7418",302 .of_match_table = ad7418_dt_ids,303 },304 .probe = ad7418_probe,305 .id_table = ad7418_id,306};307 308module_i2c_driver(ad7418_driver);309 310MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");311MODULE_DESCRIPTION("AD7416/17/18 driver");312MODULE_LICENSE("GPL");313MODULE_VERSION(DRV_VERSION);314