1 /* 2 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring 4 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru> 5 * Jean Delvare <khali@linux-fr.org> 6 * 7 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. 8 * It reports up to two temperatures (its own plus up to 9 * one external one). Complete datasheet can be 10 * obtained from Maxim's website at: 11 * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/slab.h> 32 #include <linux/jiffies.h> 33 #include <linux/i2c.h> 34 #include <linux/hwmon.h> 35 #include <linux/hwmon-sysfs.h> 36 #include <linux/err.h> 37 #include <linux/mutex.h> 38 #include <linux/sysfs.h> 39 40 static const unsigned short normal_i2c[] = { 41 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; 42 43 /* 44 * The MAX1619 registers 45 */ 46 47 #define MAX1619_REG_R_MAN_ID 0xFE 48 #define MAX1619_REG_R_CHIP_ID 0xFF 49 #define MAX1619_REG_R_CONFIG 0x03 50 #define MAX1619_REG_W_CONFIG 0x09 51 #define MAX1619_REG_R_CONVRATE 0x04 52 #define MAX1619_REG_W_CONVRATE 0x0A 53 #define MAX1619_REG_R_STATUS 0x02 54 #define MAX1619_REG_R_LOCAL_TEMP 0x00 55 #define MAX1619_REG_R_REMOTE_TEMP 0x01 56 #define MAX1619_REG_R_REMOTE_HIGH 0x07 57 #define MAX1619_REG_W_REMOTE_HIGH 0x0D 58 #define MAX1619_REG_R_REMOTE_LOW 0x08 59 #define MAX1619_REG_W_REMOTE_LOW 0x0E 60 #define MAX1619_REG_R_REMOTE_CRIT 0x10 61 #define MAX1619_REG_W_REMOTE_CRIT 0x12 62 #define MAX1619_REG_R_TCRIT_HYST 0x11 63 #define MAX1619_REG_W_TCRIT_HYST 0x13 64 65 /* 66 * Conversions 67 */ 68 69 static int temp_from_reg(int val) 70 { 71 return (val & 0x80 ? val-0x100 : val) * 1000; 72 } 73 74 static int temp_to_reg(int val) 75 { 76 return (val < 0 ? val+0x100*1000 : val) / 1000; 77 } 78 79 /* 80 * Functions declaration 81 */ 82 83 static int max1619_probe(struct i2c_client *client, 84 const struct i2c_device_id *id); 85 static int max1619_detect(struct i2c_client *client, 86 struct i2c_board_info *info); 87 static void max1619_init_client(struct i2c_client *client); 88 static int max1619_remove(struct i2c_client *client); 89 static struct max1619_data *max1619_update_device(struct device *dev); 90 91 /* 92 * Driver data (common to all clients) 93 */ 94 95 static const struct i2c_device_id max1619_id[] = { 96 { "max1619", 0 }, 97 { } 98 }; 99 MODULE_DEVICE_TABLE(i2c, max1619_id); 100 101 static struct i2c_driver max1619_driver = { 102 .class = I2C_CLASS_HWMON, 103 .driver = { 104 .name = "max1619", 105 }, 106 .probe = max1619_probe, 107 .remove = max1619_remove, 108 .id_table = max1619_id, 109 .detect = max1619_detect, 110 .address_list = normal_i2c, 111 }; 112 113 /* 114 * Client data (each client gets its own) 115 */ 116 117 struct max1619_data { 118 struct device *hwmon_dev; 119 struct mutex update_lock; 120 char valid; /* zero until following fields are valid */ 121 unsigned long last_updated; /* in jiffies */ 122 123 /* registers values */ 124 u8 temp_input1; /* local */ 125 u8 temp_input2, temp_low2, temp_high2; /* remote */ 126 u8 temp_crit2; 127 u8 temp_hyst2; 128 u8 alarms; 129 }; 130 131 /* 132 * Sysfs stuff 133 */ 134 135 #define show_temp(value) \ 136 static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ 137 { \ 138 struct max1619_data *data = max1619_update_device(dev); \ 139 return sprintf(buf, "%d\n", temp_from_reg(data->value)); \ 140 } 141 show_temp(temp_input1); 142 show_temp(temp_input2); 143 show_temp(temp_low2); 144 show_temp(temp_high2); 145 show_temp(temp_crit2); 146 show_temp(temp_hyst2); 147 148 #define set_temp2(value, reg) \ 149 static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ 150 size_t count) \ 151 { \ 152 struct i2c_client *client = to_i2c_client(dev); \ 153 struct max1619_data *data = i2c_get_clientdata(client); \ 154 long val = simple_strtol(buf, NULL, 10); \ 155 \ 156 mutex_lock(&data->update_lock); \ 157 data->value = temp_to_reg(val); \ 158 i2c_smbus_write_byte_data(client, reg, data->value); \ 159 mutex_unlock(&data->update_lock); \ 160 return count; \ 161 } 162 163 set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); 164 set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); 165 set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); 166 set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); 167 168 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) 169 { 170 struct max1619_data *data = max1619_update_device(dev); 171 return sprintf(buf, "%d\n", data->alarms); 172 } 173 174 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 175 char *buf) 176 { 177 int bitnr = to_sensor_dev_attr(attr)->index; 178 struct max1619_data *data = max1619_update_device(dev); 179 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); 180 } 181 182 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); 183 static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); 184 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, 185 set_temp_low2); 186 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, 187 set_temp_high2); 188 static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, 189 set_temp_crit2); 190 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, 191 set_temp_hyst2); 192 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 193 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); 194 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); 195 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); 196 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); 197 198 static struct attribute *max1619_attributes[] = { 199 &dev_attr_temp1_input.attr, 200 &dev_attr_temp2_input.attr, 201 &dev_attr_temp2_min.attr, 202 &dev_attr_temp2_max.attr, 203 &dev_attr_temp2_crit.attr, 204 &dev_attr_temp2_crit_hyst.attr, 205 206 &dev_attr_alarms.attr, 207 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 208 &sensor_dev_attr_temp2_fault.dev_attr.attr, 209 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, 210 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 211 NULL 212 }; 213 214 static const struct attribute_group max1619_group = { 215 .attrs = max1619_attributes, 216 }; 217 218 /* 219 * Real code 220 */ 221 222 /* Return 0 if detection is successful, -ENODEV otherwise */ 223 static int max1619_detect(struct i2c_client *client, 224 struct i2c_board_info *info) 225 { 226 struct i2c_adapter *adapter = client->adapter; 227 u8 reg_config, reg_convrate, reg_status, man_id, chip_id; 228 229 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 230 return -ENODEV; 231 232 /* detection */ 233 reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); 234 reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); 235 reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); 236 if ((reg_config & 0x03) != 0x00 237 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { 238 dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", 239 client->addr); 240 return -ENODEV; 241 } 242 243 /* identification */ 244 man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); 245 chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); 246 if (man_id != 0x4D || chip_id != 0x04) { 247 dev_info(&adapter->dev, 248 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", 249 man_id, chip_id); 250 return -ENODEV; 251 } 252 253 strlcpy(info->type, "max1619", I2C_NAME_SIZE); 254 255 return 0; 256 } 257 258 static int max1619_probe(struct i2c_client *new_client, 259 const struct i2c_device_id *id) 260 { 261 struct max1619_data *data; 262 int err; 263 264 data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL); 265 if (!data) { 266 err = -ENOMEM; 267 goto exit; 268 } 269 270 i2c_set_clientdata(new_client, data); 271 data->valid = 0; 272 mutex_init(&data->update_lock); 273 274 /* Initialize the MAX1619 chip */ 275 max1619_init_client(new_client); 276 277 /* Register sysfs hooks */ 278 if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group))) 279 goto exit_free; 280 281 data->hwmon_dev = hwmon_device_register(&new_client->dev); 282 if (IS_ERR(data->hwmon_dev)) { 283 err = PTR_ERR(data->hwmon_dev); 284 goto exit_remove_files; 285 } 286 287 return 0; 288 289 exit_remove_files: 290 sysfs_remove_group(&new_client->dev.kobj, &max1619_group); 291 exit_free: 292 kfree(data); 293 exit: 294 return err; 295 } 296 297 static void max1619_init_client(struct i2c_client *client) 298 { 299 u8 config; 300 301 /* 302 * Start the conversions. 303 */ 304 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, 305 5); /* 2 Hz */ 306 config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); 307 if (config & 0x40) 308 i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, 309 config & 0xBF); /* run */ 310 } 311 312 static int max1619_remove(struct i2c_client *client) 313 { 314 struct max1619_data *data = i2c_get_clientdata(client); 315 316 hwmon_device_unregister(data->hwmon_dev); 317 sysfs_remove_group(&client->dev.kobj, &max1619_group); 318 319 kfree(data); 320 return 0; 321 } 322 323 static struct max1619_data *max1619_update_device(struct device *dev) 324 { 325 struct i2c_client *client = to_i2c_client(dev); 326 struct max1619_data *data = i2c_get_clientdata(client); 327 328 mutex_lock(&data->update_lock); 329 330 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { 331 dev_dbg(&client->dev, "Updating max1619 data.\n"); 332 data->temp_input1 = i2c_smbus_read_byte_data(client, 333 MAX1619_REG_R_LOCAL_TEMP); 334 data->temp_input2 = i2c_smbus_read_byte_data(client, 335 MAX1619_REG_R_REMOTE_TEMP); 336 data->temp_high2 = i2c_smbus_read_byte_data(client, 337 MAX1619_REG_R_REMOTE_HIGH); 338 data->temp_low2 = i2c_smbus_read_byte_data(client, 339 MAX1619_REG_R_REMOTE_LOW); 340 data->temp_crit2 = i2c_smbus_read_byte_data(client, 341 MAX1619_REG_R_REMOTE_CRIT); 342 data->temp_hyst2 = i2c_smbus_read_byte_data(client, 343 MAX1619_REG_R_TCRIT_HYST); 344 data->alarms = i2c_smbus_read_byte_data(client, 345 MAX1619_REG_R_STATUS); 346 347 data->last_updated = jiffies; 348 data->valid = 1; 349 } 350 351 mutex_unlock(&data->update_lock); 352 353 return data; 354 } 355 356 static int __init sensors_max1619_init(void) 357 { 358 return i2c_add_driver(&max1619_driver); 359 } 360 361 static void __exit sensors_max1619_exit(void) 362 { 363 i2c_del_driver(&max1619_driver); 364 } 365 366 MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " 367 "Jean Delvare <khali@linux-fr.org>"); 368 MODULE_DESCRIPTION("MAX1619 sensor driver"); 369 MODULE_LICENSE("GPL"); 370 371 module_init(sensors_max1619_init); 372 module_exit(sensors_max1619_exit); 373