1 /* 2 * An hwmon driver for the Analog Devices AD7416/17/18 3 * Copyright (C) 2006-07 Tower Technologies 4 * 5 * Author: Alessandro Zummo <a.zummo@towertech.it> 6 * 7 * Based on lm75.c 8 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License, 12 * as published by the Free Software Foundation - version 2. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/jiffies.h> 17 #include <linux/i2c.h> 18 #include <linux/hwmon.h> 19 #include <linux/hwmon-sysfs.h> 20 #include <linux/err.h> 21 #include <linux/mutex.h> 22 #include <linux/of_device.h> 23 #include <linux/delay.h> 24 #include <linux/slab.h> 25 26 #include "lm75.h" 27 28 #define DRV_VERSION "0.4" 29 30 enum chips { ad7416, ad7417, ad7418 }; 31 32 /* AD7418 registers */ 33 #define AD7418_REG_TEMP_IN 0x00 34 #define AD7418_REG_CONF 0x01 35 #define AD7418_REG_TEMP_HYST 0x02 36 #define AD7418_REG_TEMP_OS 0x03 37 #define AD7418_REG_ADC 0x04 38 #define AD7418_REG_CONF2 0x05 39 40 #define AD7418_REG_ADC_CH(x) ((x) << 5) 41 #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) 42 43 static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, 44 AD7418_REG_TEMP_HYST, 45 AD7418_REG_TEMP_OS }; 46 47 struct ad7418_data { 48 struct i2c_client *client; 49 enum chips type; 50 struct mutex lock; 51 int adc_max; /* number of ADC channels */ 52 char valid; 53 unsigned long last_updated; /* In jiffies */ 54 s16 temp[3]; /* Register values */ 55 u16 in[4]; 56 }; 57 58 static int ad7418_update_device(struct device *dev) 59 { 60 struct ad7418_data *data = dev_get_drvdata(dev); 61 struct i2c_client *client = data->client; 62 s32 val; 63 64 mutex_lock(&data->lock); 65 66 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 67 || !data->valid) { 68 u8 cfg; 69 int i, ch; 70 71 /* read config register and clear channel bits */ 72 val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); 73 if (val < 0) 74 goto abort; 75 76 cfg = val; 77 cfg &= 0x1F; 78 79 val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, 80 cfg | AD7418_CH_TEMP); 81 if (val < 0) 82 goto abort; 83 84 udelay(30); 85 86 for (i = 0; i < 3; i++) { 87 val = i2c_smbus_read_word_swapped(client, 88 AD7418_REG_TEMP[i]); 89 if (val < 0) 90 goto abort; 91 92 data->temp[i] = val; 93 } 94 95 for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { 96 val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, 97 cfg | AD7418_REG_ADC_CH(ch)); 98 if (val < 0) 99 goto abort; 100 101 udelay(15); 102 val = i2c_smbus_read_word_swapped(client, 103 AD7418_REG_ADC); 104 if (val < 0) 105 goto abort; 106 107 data->in[data->adc_max - 1 - i] = val; 108 } 109 110 /* restore old configuration value */ 111 val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, 112 cfg); 113 if (val < 0) 114 goto abort; 115 116 data->last_updated = jiffies; 117 data->valid = 1; 118 } 119 120 mutex_unlock(&data->lock); 121 return 0; 122 123 abort: 124 data->valid = 0; 125 mutex_unlock(&data->lock); 126 return val; 127 } 128 129 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 130 char *buf) 131 { 132 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 133 struct ad7418_data *data = dev_get_drvdata(dev); 134 int ret; 135 136 ret = ad7418_update_device(dev); 137 if (ret < 0) 138 return ret; 139 140 return sprintf(buf, "%d\n", 141 LM75_TEMP_FROM_REG(data->temp[attr->index])); 142 } 143 144 static ssize_t adc_show(struct device *dev, struct device_attribute *devattr, 145 char *buf) 146 { 147 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 148 struct ad7418_data *data = dev_get_drvdata(dev); 149 int ret; 150 151 ret = ad7418_update_device(dev); 152 if (ret < 0) 153 return ret; 154 155 return sprintf(buf, "%d\n", 156 ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); 157 } 158 159 static ssize_t temp_store(struct device *dev, 160 struct device_attribute *devattr, const char *buf, 161 size_t count) 162 { 163 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 164 struct ad7418_data *data = dev_get_drvdata(dev); 165 struct i2c_client *client = data->client; 166 long temp; 167 int ret = kstrtol(buf, 10, &temp); 168 169 if (ret < 0) 170 return ret; 171 172 mutex_lock(&data->lock); 173 data->temp[attr->index] = LM75_TEMP_TO_REG(temp); 174 i2c_smbus_write_word_swapped(client, 175 AD7418_REG_TEMP[attr->index], 176 data->temp[attr->index]); 177 mutex_unlock(&data->lock); 178 return count; 179 } 180 181 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); 182 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1); 183 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); 184 185 static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0); 186 static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1); 187 static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2); 188 static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3); 189 190 static struct attribute *ad7416_attrs[] = { 191 &sensor_dev_attr_temp1_max.dev_attr.attr, 192 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 193 &sensor_dev_attr_temp1_input.dev_attr.attr, 194 NULL 195 }; 196 ATTRIBUTE_GROUPS(ad7416); 197 198 static struct attribute *ad7417_attrs[] = { 199 &sensor_dev_attr_temp1_max.dev_attr.attr, 200 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 201 &sensor_dev_attr_temp1_input.dev_attr.attr, 202 &sensor_dev_attr_in1_input.dev_attr.attr, 203 &sensor_dev_attr_in2_input.dev_attr.attr, 204 &sensor_dev_attr_in3_input.dev_attr.attr, 205 &sensor_dev_attr_in4_input.dev_attr.attr, 206 NULL 207 }; 208 ATTRIBUTE_GROUPS(ad7417); 209 210 static struct attribute *ad7418_attrs[] = { 211 &sensor_dev_attr_temp1_max.dev_attr.attr, 212 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 213 &sensor_dev_attr_temp1_input.dev_attr.attr, 214 &sensor_dev_attr_in1_input.dev_attr.attr, 215 NULL 216 }; 217 ATTRIBUTE_GROUPS(ad7418); 218 219 static void ad7418_init_client(struct i2c_client *client) 220 { 221 struct ad7418_data *data = i2c_get_clientdata(client); 222 223 int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); 224 if (reg < 0) { 225 dev_err(&client->dev, "cannot read configuration register\n"); 226 } else { 227 dev_info(&client->dev, "configuring for mode 1\n"); 228 i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); 229 230 if (data->type == ad7417 || data->type == ad7418) 231 i2c_smbus_write_byte_data(client, 232 AD7418_REG_CONF2, 0x00); 233 } 234 } 235 236 static int ad7418_probe(struct i2c_client *client, 237 const struct i2c_device_id *id) 238 { 239 struct device *dev = &client->dev; 240 struct i2c_adapter *adapter = client->adapter; 241 struct ad7418_data *data; 242 struct device *hwmon_dev; 243 const struct attribute_group **attr_groups = NULL; 244 245 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 246 I2C_FUNC_SMBUS_WORD_DATA)) 247 return -EOPNOTSUPP; 248 249 data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); 250 if (!data) 251 return -ENOMEM; 252 253 i2c_set_clientdata(client, data); 254 255 mutex_init(&data->lock); 256 data->client = client; 257 if (dev->of_node) 258 data->type = (enum chips)of_device_get_match_data(dev); 259 else 260 data->type = id->driver_data; 261 262 switch (data->type) { 263 case ad7416: 264 data->adc_max = 0; 265 attr_groups = ad7416_groups; 266 break; 267 268 case ad7417: 269 data->adc_max = 4; 270 attr_groups = ad7417_groups; 271 break; 272 273 case ad7418: 274 data->adc_max = 1; 275 attr_groups = ad7418_groups; 276 break; 277 } 278 279 dev_info(dev, "%s chip found\n", client->name); 280 281 /* Initialize the AD7418 chip */ 282 ad7418_init_client(client); 283 284 hwmon_dev = devm_hwmon_device_register_with_groups(dev, 285 client->name, 286 data, attr_groups); 287 return PTR_ERR_OR_ZERO(hwmon_dev); 288 } 289 290 static const struct i2c_device_id ad7418_id[] = { 291 { "ad7416", ad7416 }, 292 { "ad7417", ad7417 }, 293 { "ad7418", ad7418 }, 294 { } 295 }; 296 MODULE_DEVICE_TABLE(i2c, ad7418_id); 297 298 static const struct of_device_id ad7418_dt_ids[] = { 299 { .compatible = "adi,ad7416", .data = (void *)ad7416, }, 300 { .compatible = "adi,ad7417", .data = (void *)ad7417, }, 301 { .compatible = "adi,ad7418", .data = (void *)ad7418, }, 302 { } 303 }; 304 MODULE_DEVICE_TABLE(of, ad7418_dt_ids); 305 306 static struct i2c_driver ad7418_driver = { 307 .driver = { 308 .name = "ad7418", 309 .of_match_table = ad7418_dt_ids, 310 }, 311 .probe = ad7418_probe, 312 .id_table = ad7418_id, 313 }; 314 315 module_i2c_driver(ad7418_driver); 316 317 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 318 MODULE_DESCRIPTION("AD7416/17/18 driver"); 319 MODULE_LICENSE("GPL"); 320 MODULE_VERSION(DRV_VERSION); 321