1 /* 2 thmc50.c - Part of lm_sensors, Linux kernel modules for hardware 3 monitoring 4 Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl> 5 Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and 6 Philip Edelbrock <phil@netroedge.com> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <linux/i2c.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 #include <linux/err.h> 30 #include <linux/mutex.h> 31 32 MODULE_LICENSE("GPL"); 33 34 /* Addresses to scan */ 35 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 36 37 /* Insmod parameters */ 38 I2C_CLIENT_INSMOD_2(thmc50, adm1022); 39 I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs " 40 "to enable 3rd temperature (ADM1022 only)"); 41 42 /* Many THMC50 constants specified below */ 43 44 /* The THMC50 registers */ 45 #define THMC50_REG_CONF 0x40 46 #define THMC50_REG_COMPANY_ID 0x3E 47 #define THMC50_REG_DIE_CODE 0x3F 48 #define THMC50_REG_ANALOG_OUT 0x19 49 /* 50 * The mirror status register cannot be used as 51 * reading it does not clear alarms. 52 */ 53 #define THMC50_REG_INTR 0x41 54 55 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 }; 56 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C }; 57 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B }; 58 59 #define THMC50_REG_CONF_nFANOFF 0x20 60 61 /* Each client has this additional data */ 62 struct thmc50_data { 63 struct device *hwmon_dev; 64 65 struct mutex update_lock; 66 enum chips type; 67 unsigned long last_updated; /* In jiffies */ 68 char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */ 69 char valid; /* !=0 if following fields are valid */ 70 71 /* Register values */ 72 s8 temp_input[3]; 73 s8 temp_max[3]; 74 s8 temp_min[3]; 75 u8 analog_out; 76 u8 alarms; 77 }; 78 79 static int thmc50_detect(struct i2c_client *client, int kind, 80 struct i2c_board_info *info); 81 static int thmc50_probe(struct i2c_client *client, 82 const struct i2c_device_id *id); 83 static int thmc50_remove(struct i2c_client *client); 84 static void thmc50_init_client(struct i2c_client *client); 85 static struct thmc50_data *thmc50_update_device(struct device *dev); 86 87 static const struct i2c_device_id thmc50_id[] = { 88 { "adm1022", adm1022 }, 89 { "thmc50", thmc50 }, 90 { } 91 }; 92 MODULE_DEVICE_TABLE(i2c, thmc50_id); 93 94 static struct i2c_driver thmc50_driver = { 95 .class = I2C_CLASS_HWMON, 96 .driver = { 97 .name = "thmc50", 98 }, 99 .probe = thmc50_probe, 100 .remove = thmc50_remove, 101 .id_table = thmc50_id, 102 .detect = thmc50_detect, 103 .address_data = &addr_data, 104 }; 105 106 static ssize_t show_analog_out(struct device *dev, 107 struct device_attribute *attr, char *buf) 108 { 109 struct thmc50_data *data = thmc50_update_device(dev); 110 return sprintf(buf, "%d\n", data->analog_out); 111 } 112 113 static ssize_t set_analog_out(struct device *dev, 114 struct device_attribute *attr, 115 const char *buf, size_t count) 116 { 117 struct i2c_client *client = to_i2c_client(dev); 118 struct thmc50_data *data = i2c_get_clientdata(client); 119 int tmp = simple_strtoul(buf, NULL, 10); 120 int config; 121 122 mutex_lock(&data->update_lock); 123 data->analog_out = SENSORS_LIMIT(tmp, 0, 255); 124 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 125 data->analog_out); 126 127 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 128 if (data->analog_out == 0) 129 config &= ~THMC50_REG_CONF_nFANOFF; 130 else 131 config |= THMC50_REG_CONF_nFANOFF; 132 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 133 134 mutex_unlock(&data->update_lock); 135 return count; 136 } 137 138 /* There is only one PWM mode = DC */ 139 static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr, 140 char *buf) 141 { 142 return sprintf(buf, "0\n"); 143 } 144 145 /* Temperatures */ 146 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 147 char *buf) 148 { 149 int nr = to_sensor_dev_attr(attr)->index; 150 struct thmc50_data *data = thmc50_update_device(dev); 151 return sprintf(buf, "%d\n", data->temp_input[nr] * 1000); 152 } 153 154 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, 155 char *buf) 156 { 157 int nr = to_sensor_dev_attr(attr)->index; 158 struct thmc50_data *data = thmc50_update_device(dev); 159 return sprintf(buf, "%d\n", data->temp_min[nr] * 1000); 160 } 161 162 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, 163 const char *buf, size_t count) 164 { 165 int nr = to_sensor_dev_attr(attr)->index; 166 struct i2c_client *client = to_i2c_client(dev); 167 struct thmc50_data *data = i2c_get_clientdata(client); 168 int val = simple_strtol(buf, NULL, 10); 169 170 mutex_lock(&data->update_lock); 171 data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127); 172 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr], 173 data->temp_min[nr]); 174 mutex_unlock(&data->update_lock); 175 return count; 176 } 177 178 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, 179 char *buf) 180 { 181 int nr = to_sensor_dev_attr(attr)->index; 182 struct thmc50_data *data = thmc50_update_device(dev); 183 return sprintf(buf, "%d\n", data->temp_max[nr] * 1000); 184 } 185 186 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, 187 const char *buf, size_t count) 188 { 189 int nr = to_sensor_dev_attr(attr)->index; 190 struct i2c_client *client = to_i2c_client(dev); 191 struct thmc50_data *data = i2c_get_clientdata(client); 192 int val = simple_strtol(buf, NULL, 10); 193 194 mutex_lock(&data->update_lock); 195 data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127); 196 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr], 197 data->temp_max[nr]); 198 mutex_unlock(&data->update_lock); 199 return count; 200 } 201 202 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 203 char *buf) 204 { 205 int index = to_sensor_dev_attr(attr)->index; 206 struct thmc50_data *data = thmc50_update_device(dev); 207 208 return sprintf(buf, "%u\n", (data->alarms >> index) & 1); 209 } 210 211 #define temp_reg(offset) \ 212 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \ 213 NULL, offset - 1); \ 214 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ 215 show_temp_min, set_temp_min, offset - 1); \ 216 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 217 show_temp_max, set_temp_max, offset - 1); 218 219 temp_reg(1); 220 temp_reg(2); 221 temp_reg(3); 222 223 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0); 224 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5); 225 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1); 226 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 7); 227 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2); 228 229 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out, 230 set_analog_out, 0); 231 static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0); 232 233 static struct attribute *thmc50_attributes[] = { 234 &sensor_dev_attr_temp1_max.dev_attr.attr, 235 &sensor_dev_attr_temp1_min.dev_attr.attr, 236 &sensor_dev_attr_temp1_input.dev_attr.attr, 237 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 238 &sensor_dev_attr_temp2_max.dev_attr.attr, 239 &sensor_dev_attr_temp2_min.dev_attr.attr, 240 &sensor_dev_attr_temp2_input.dev_attr.attr, 241 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 242 &sensor_dev_attr_temp2_fault.dev_attr.attr, 243 &sensor_dev_attr_pwm1.dev_attr.attr, 244 &sensor_dev_attr_pwm1_mode.dev_attr.attr, 245 NULL 246 }; 247 248 static const struct attribute_group thmc50_group = { 249 .attrs = thmc50_attributes, 250 }; 251 252 /* for ADM1022 3rd temperature mode */ 253 static struct attribute *temp3_attributes[] = { 254 &sensor_dev_attr_temp3_max.dev_attr.attr, 255 &sensor_dev_attr_temp3_min.dev_attr.attr, 256 &sensor_dev_attr_temp3_input.dev_attr.attr, 257 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 258 &sensor_dev_attr_temp3_fault.dev_attr.attr, 259 NULL 260 }; 261 262 static const struct attribute_group temp3_group = { 263 .attrs = temp3_attributes, 264 }; 265 266 /* Return 0 if detection is successful, -ENODEV otherwise */ 267 static int thmc50_detect(struct i2c_client *client, int kind, 268 struct i2c_board_info *info) 269 { 270 unsigned company; 271 unsigned revision; 272 unsigned config; 273 struct i2c_adapter *adapter = client->adapter; 274 int err = 0; 275 const char *type_name; 276 277 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 278 pr_debug("thmc50: detect failed, " 279 "smbus byte data not supported!\n"); 280 return -ENODEV; 281 } 282 283 pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n", 284 client->addr, i2c_adapter_id(client->adapter)); 285 286 /* Now, we do the remaining detection. */ 287 company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID); 288 revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE); 289 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 290 291 if (kind == 0) 292 kind = thmc50; 293 else if (kind < 0) { 294 err = -ENODEV; 295 if (revision >= 0xc0 && ((config & 0x10) == 0)) { 296 if (company == 0x49) { 297 kind = thmc50; 298 err = 0; 299 } else if (company == 0x41) { 300 kind = adm1022; 301 err = 0; 302 } 303 } 304 } 305 if (err == -ENODEV) { 306 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n"); 307 return err; 308 } 309 310 if (kind == adm1022) { 311 int id = i2c_adapter_id(client->adapter); 312 int i; 313 314 type_name = "adm1022"; 315 for (i = 0; i + 1 < adm1022_temp3_num; i += 2) 316 if (adm1022_temp3[i] == id && 317 adm1022_temp3[i + 1] == client->addr) { 318 /* enable 2nd remote temp */ 319 config |= (1 << 7); 320 i2c_smbus_write_byte_data(client, 321 THMC50_REG_CONF, 322 config); 323 break; 324 } 325 } else { 326 type_name = "thmc50"; 327 } 328 pr_debug("thmc50: Detected %s (version %x, revision %x)\n", 329 type_name, (revision >> 4) - 0xc, revision & 0xf); 330 331 strlcpy(info->type, type_name, I2C_NAME_SIZE); 332 333 return 0; 334 } 335 336 static int thmc50_probe(struct i2c_client *client, 337 const struct i2c_device_id *id) 338 { 339 struct thmc50_data *data; 340 int err; 341 342 data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL); 343 if (!data) { 344 pr_debug("thmc50: detect failed, kzalloc failed!\n"); 345 err = -ENOMEM; 346 goto exit; 347 } 348 349 i2c_set_clientdata(client, data); 350 data->type = id->driver_data; 351 mutex_init(&data->update_lock); 352 353 thmc50_init_client(client); 354 355 /* Register sysfs hooks */ 356 if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group))) 357 goto exit_free; 358 359 /* Register ADM1022 sysfs hooks */ 360 if (data->has_temp3) 361 if ((err = sysfs_create_group(&client->dev.kobj, 362 &temp3_group))) 363 goto exit_remove_sysfs_thmc50; 364 365 /* Register a new directory entry with module sensors */ 366 data->hwmon_dev = hwmon_device_register(&client->dev); 367 if (IS_ERR(data->hwmon_dev)) { 368 err = PTR_ERR(data->hwmon_dev); 369 goto exit_remove_sysfs; 370 } 371 372 return 0; 373 374 exit_remove_sysfs: 375 if (data->has_temp3) 376 sysfs_remove_group(&client->dev.kobj, &temp3_group); 377 exit_remove_sysfs_thmc50: 378 sysfs_remove_group(&client->dev.kobj, &thmc50_group); 379 exit_free: 380 kfree(data); 381 exit: 382 return err; 383 } 384 385 static int thmc50_remove(struct i2c_client *client) 386 { 387 struct thmc50_data *data = i2c_get_clientdata(client); 388 389 hwmon_device_unregister(data->hwmon_dev); 390 sysfs_remove_group(&client->dev.kobj, &thmc50_group); 391 if (data->has_temp3) 392 sysfs_remove_group(&client->dev.kobj, &temp3_group); 393 394 kfree(data); 395 396 return 0; 397 } 398 399 static void thmc50_init_client(struct i2c_client *client) 400 { 401 struct thmc50_data *data = i2c_get_clientdata(client); 402 int config; 403 404 data->analog_out = i2c_smbus_read_byte_data(client, 405 THMC50_REG_ANALOG_OUT); 406 /* set up to at least 1 */ 407 if (data->analog_out == 0) { 408 data->analog_out = 1; 409 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 410 data->analog_out); 411 } 412 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 413 config |= 0x1; /* start the chip if it is in standby mode */ 414 if (data->type == adm1022 && (config & (1 << 7))) 415 data->has_temp3 = 1; 416 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 417 } 418 419 static struct thmc50_data *thmc50_update_device(struct device *dev) 420 { 421 struct i2c_client *client = to_i2c_client(dev); 422 struct thmc50_data *data = i2c_get_clientdata(client); 423 int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0); 424 425 mutex_lock(&data->update_lock); 426 427 if (time_after(jiffies, data->last_updated + timeout) 428 || !data->valid) { 429 430 int temps = data->has_temp3 ? 3 : 2; 431 int i; 432 for (i = 0; i < temps; i++) { 433 data->temp_input[i] = i2c_smbus_read_byte_data(client, 434 THMC50_REG_TEMP[i]); 435 data->temp_max[i] = i2c_smbus_read_byte_data(client, 436 THMC50_REG_TEMP_MAX[i]); 437 data->temp_min[i] = i2c_smbus_read_byte_data(client, 438 THMC50_REG_TEMP_MIN[i]); 439 } 440 data->analog_out = 441 i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); 442 data->alarms = 443 i2c_smbus_read_byte_data(client, THMC50_REG_INTR); 444 data->last_updated = jiffies; 445 data->valid = 1; 446 } 447 448 mutex_unlock(&data->update_lock); 449 450 return data; 451 } 452 453 static int __init sm_thmc50_init(void) 454 { 455 return i2c_add_driver(&thmc50_driver); 456 } 457 458 static void __exit sm_thmc50_exit(void) 459 { 460 i2c_del_driver(&thmc50_driver); 461 } 462 463 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>"); 464 MODULE_DESCRIPTION("THMC50 driver"); 465 466 module_init(sm_thmc50_init); 467 module_exit(sm_thmc50_exit); 468