1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * An hwmon driver for the Analog Devices AD7416/17/18 4 * Copyright (C) 2006-07 Tower Technologies 5 * 6 * Author: Alessandro Zummo <a.zummo@towertech.it> 7 * 8 * Based on lm75.c 9 * 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_device.h> 20 #include <linux/delay.h> 21 #include <linux/slab.h> 22 23 #include "lm75.h" 24 25 #define DRV_VERSION "0.4" 26 27 enum chips { ad7416, ad7417, ad7418 }; 28 29 /* AD7418 registers */ 30 #define AD7418_REG_TEMP_IN 0x00 31 #define AD7418_REG_CONF 0x01 32 #define AD7418_REG_TEMP_HYST 0x02 33 #define AD7418_REG_TEMP_OS 0x03 34 #define AD7418_REG_ADC 0x04 35 #define AD7418_REG_CONF2 0x05 36 37 #define AD7418_REG_ADC_CH(x) ((x) << 5) 38 #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) 39 40 static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, 41 AD7418_REG_TEMP_HYST, 42 AD7418_REG_TEMP_OS }; 43 44 struct 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 55 static 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; 119 120 abort: 121 data->valid = false; 122 mutex_unlock(&data->lock); 123 return val; 124 } 125 126 static 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 } 140 141 static 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 } 155 156 static 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 } 177 178 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); 179 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1); 180 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); 181 182 static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0); 183 static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1); 184 static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2); 185 static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3); 186 187 static 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 NULL 192 }; 193 ATTRIBUTE_GROUPS(ad7416); 194 195 static 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 NULL 204 }; 205 ATTRIBUTE_GROUPS(ad7417); 206 207 static 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 NULL 213 }; 214 ATTRIBUTE_GROUPS(ad7418); 215 216 static 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 } 232 233 static const struct i2c_device_id ad7418_id[]; 234 235 static int ad7418_probe(struct i2c_client *client) 236 { 237 struct device *dev = &client->dev; 238 struct i2c_adapter *adapter = client->adapter; 239 struct ad7418_data *data; 240 struct device *hwmon_dev; 241 const struct attribute_group **attr_groups = NULL; 242 243 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 244 I2C_FUNC_SMBUS_WORD_DATA)) 245 return -EOPNOTSUPP; 246 247 data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); 248 if (!data) 249 return -ENOMEM; 250 251 i2c_set_clientdata(client, data); 252 253 mutex_init(&data->lock); 254 data->client = client; 255 if (dev->of_node) 256 data->type = (enum chips)of_device_get_match_data(dev); 257 else 258 data->type = i2c_match_id(ad7418_id, client)->driver_data; 259 260 switch (data->type) { 261 case ad7416: 262 data->adc_max = 0; 263 attr_groups = ad7416_groups; 264 break; 265 266 case ad7417: 267 data->adc_max = 4; 268 attr_groups = ad7417_groups; 269 break; 270 271 case ad7418: 272 data->adc_max = 1; 273 attr_groups = ad7418_groups; 274 break; 275 } 276 277 dev_info(dev, "%s chip found\n", client->name); 278 279 /* Initialize the AD7418 chip */ 280 ad7418_init_client(client); 281 282 hwmon_dev = devm_hwmon_device_register_with_groups(dev, 283 client->name, 284 data, attr_groups); 285 return PTR_ERR_OR_ZERO(hwmon_dev); 286 } 287 288 static const struct i2c_device_id ad7418_id[] = { 289 { "ad7416", ad7416 }, 290 { "ad7417", ad7417 }, 291 { "ad7418", ad7418 }, 292 { } 293 }; 294 MODULE_DEVICE_TABLE(i2c, ad7418_id); 295 296 static const struct of_device_id ad7418_dt_ids[] = { 297 { .compatible = "adi,ad7416", .data = (void *)ad7416, }, 298 { .compatible = "adi,ad7417", .data = (void *)ad7417, }, 299 { .compatible = "adi,ad7418", .data = (void *)ad7418, }, 300 { } 301 }; 302 MODULE_DEVICE_TABLE(of, ad7418_dt_ids); 303 304 static struct i2c_driver ad7418_driver = { 305 .driver = { 306 .name = "ad7418", 307 .of_match_table = ad7418_dt_ids, 308 }, 309 .probe = ad7418_probe, 310 .id_table = ad7418_id, 311 }; 312 313 module_i2c_driver(ad7418_driver); 314 315 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 316 MODULE_DESCRIPTION("AD7416/17/18 driver"); 317 MODULE_LICENSE("GPL"); 318 MODULE_VERSION(DRV_VERSION); 319