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 #include <linux/jiffies.h> 32 33 MODULE_LICENSE("GPL"); 34 35 /* Addresses to scan */ 36 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 37 38 /* Insmod parameters */ 39 enum chips { thmc50, adm1022 }; 40 41 static unsigned short adm1022_temp3[16]; 42 static unsigned int adm1022_temp3_num; 43 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0); 44 MODULE_PARM_DESC(adm1022_temp3, 45 "List of adapter,address pairs to enable 3rd temperature (ADM1022 only)"); 46 47 /* Many THMC50 constants specified below */ 48 49 /* The THMC50 registers */ 50 #define THMC50_REG_CONF 0x40 51 #define THMC50_REG_COMPANY_ID 0x3E 52 #define THMC50_REG_DIE_CODE 0x3F 53 #define THMC50_REG_ANALOG_OUT 0x19 54 /* 55 * The mirror status register cannot be used as 56 * reading it does not clear alarms. 57 */ 58 #define THMC50_REG_INTR 0x41 59 60 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 }; 61 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C }; 62 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B }; 63 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 }; 64 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 }; 65 66 #define THMC50_REG_CONF_nFANOFF 0x20 67 #define THMC50_REG_CONF_PROGRAMMED 0x08 68 69 /* Each client has this additional data */ 70 struct thmc50_data { 71 struct i2c_client *client; 72 const struct attribute_group *groups[3]; 73 74 struct mutex update_lock; 75 enum chips type; 76 unsigned long last_updated; /* In jiffies */ 77 char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */ 78 char valid; /* !=0 if following fields are valid */ 79 80 /* Register values */ 81 s8 temp_input[3]; 82 s8 temp_max[3]; 83 s8 temp_min[3]; 84 s8 temp_critical[3]; 85 u8 analog_out; 86 u8 alarms; 87 }; 88 89 static struct thmc50_data *thmc50_update_device(struct device *dev) 90 { 91 struct thmc50_data *data = dev_get_drvdata(dev); 92 struct i2c_client *client = data->client; 93 int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0); 94 95 mutex_lock(&data->update_lock); 96 97 if (time_after(jiffies, data->last_updated + timeout) 98 || !data->valid) { 99 100 int temps = data->has_temp3 ? 3 : 2; 101 int i; 102 int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 103 104 prog &= THMC50_REG_CONF_PROGRAMMED; 105 106 for (i = 0; i < temps; i++) { 107 data->temp_input[i] = i2c_smbus_read_byte_data(client, 108 THMC50_REG_TEMP[i]); 109 data->temp_max[i] = i2c_smbus_read_byte_data(client, 110 THMC50_REG_TEMP_MAX[i]); 111 data->temp_min[i] = i2c_smbus_read_byte_data(client, 112 THMC50_REG_TEMP_MIN[i]); 113 data->temp_critical[i] = 114 i2c_smbus_read_byte_data(client, 115 prog ? THMC50_REG_TEMP_CRITICAL[i] 116 : THMC50_REG_TEMP_DEFAULT[i]); 117 } 118 data->analog_out = 119 i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); 120 data->alarms = 121 i2c_smbus_read_byte_data(client, THMC50_REG_INTR); 122 data->last_updated = jiffies; 123 data->valid = 1; 124 } 125 126 mutex_unlock(&data->update_lock); 127 128 return data; 129 } 130 131 static ssize_t analog_out_show(struct device *dev, 132 struct device_attribute *attr, char *buf) 133 { 134 struct thmc50_data *data = thmc50_update_device(dev); 135 return sprintf(buf, "%d\n", data->analog_out); 136 } 137 138 static ssize_t analog_out_store(struct device *dev, 139 struct device_attribute *attr, 140 const char *buf, size_t count) 141 { 142 struct thmc50_data *data = dev_get_drvdata(dev); 143 struct i2c_client *client = data->client; 144 int config; 145 unsigned long tmp; 146 int err; 147 148 err = kstrtoul(buf, 10, &tmp); 149 if (err) 150 return err; 151 152 mutex_lock(&data->update_lock); 153 data->analog_out = clamp_val(tmp, 0, 255); 154 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 155 data->analog_out); 156 157 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 158 if (data->analog_out == 0) 159 config &= ~THMC50_REG_CONF_nFANOFF; 160 else 161 config |= THMC50_REG_CONF_nFANOFF; 162 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 163 164 mutex_unlock(&data->update_lock); 165 return count; 166 } 167 168 /* There is only one PWM mode = DC */ 169 static ssize_t pwm_mode_show(struct device *dev, 170 struct device_attribute *attr, char *buf) 171 { 172 return sprintf(buf, "0\n"); 173 } 174 175 /* Temperatures */ 176 static ssize_t temp_show(struct device *dev, struct device_attribute *attr, 177 char *buf) 178 { 179 int nr = to_sensor_dev_attr(attr)->index; 180 struct thmc50_data *data = thmc50_update_device(dev); 181 return sprintf(buf, "%d\n", data->temp_input[nr] * 1000); 182 } 183 184 static ssize_t temp_min_show(struct device *dev, 185 struct device_attribute *attr, char *buf) 186 { 187 int nr = to_sensor_dev_attr(attr)->index; 188 struct thmc50_data *data = thmc50_update_device(dev); 189 return sprintf(buf, "%d\n", data->temp_min[nr] * 1000); 190 } 191 192 static ssize_t temp_min_store(struct device *dev, 193 struct device_attribute *attr, const char *buf, 194 size_t count) 195 { 196 int nr = to_sensor_dev_attr(attr)->index; 197 struct thmc50_data *data = dev_get_drvdata(dev); 198 struct i2c_client *client = data->client; 199 long val; 200 int err; 201 202 err = kstrtol(buf, 10, &val); 203 if (err) 204 return err; 205 206 mutex_lock(&data->update_lock); 207 data->temp_min[nr] = clamp_val(val / 1000, -128, 127); 208 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr], 209 data->temp_min[nr]); 210 mutex_unlock(&data->update_lock); 211 return count; 212 } 213 214 static ssize_t temp_max_show(struct device *dev, 215 struct device_attribute *attr, char *buf) 216 { 217 int nr = to_sensor_dev_attr(attr)->index; 218 struct thmc50_data *data = thmc50_update_device(dev); 219 return sprintf(buf, "%d\n", data->temp_max[nr] * 1000); 220 } 221 222 static ssize_t temp_max_store(struct device *dev, 223 struct device_attribute *attr, const char *buf, 224 size_t count) 225 { 226 int nr = to_sensor_dev_attr(attr)->index; 227 struct thmc50_data *data = dev_get_drvdata(dev); 228 struct i2c_client *client = data->client; 229 long val; 230 int err; 231 232 err = kstrtol(buf, 10, &val); 233 if (err) 234 return err; 235 236 mutex_lock(&data->update_lock); 237 data->temp_max[nr] = clamp_val(val / 1000, -128, 127); 238 i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr], 239 data->temp_max[nr]); 240 mutex_unlock(&data->update_lock); 241 return count; 242 } 243 244 static ssize_t temp_critical_show(struct device *dev, 245 struct device_attribute *attr, char *buf) 246 { 247 int nr = to_sensor_dev_attr(attr)->index; 248 struct thmc50_data *data = thmc50_update_device(dev); 249 return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000); 250 } 251 252 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 253 char *buf) 254 { 255 int index = to_sensor_dev_attr(attr)->index; 256 struct thmc50_data *data = thmc50_update_device(dev); 257 258 return sprintf(buf, "%u\n", (data->alarms >> index) & 1); 259 } 260 261 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); 262 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0); 263 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); 264 static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp_critical, 0); 265 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); 266 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1); 267 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); 268 static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp_critical, 1); 269 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); 270 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2); 271 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2); 272 static SENSOR_DEVICE_ATTR_RO(temp3_crit, temp_critical, 2); 273 274 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0); 275 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5); 276 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 1); 277 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 7); 278 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2); 279 280 static SENSOR_DEVICE_ATTR_RW(pwm1, analog_out, 0); 281 static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0); 282 283 static struct attribute *thmc50_attributes[] = { 284 &sensor_dev_attr_temp1_max.dev_attr.attr, 285 &sensor_dev_attr_temp1_min.dev_attr.attr, 286 &sensor_dev_attr_temp1_input.dev_attr.attr, 287 &sensor_dev_attr_temp1_crit.dev_attr.attr, 288 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 289 &sensor_dev_attr_temp2_max.dev_attr.attr, 290 &sensor_dev_attr_temp2_min.dev_attr.attr, 291 &sensor_dev_attr_temp2_input.dev_attr.attr, 292 &sensor_dev_attr_temp2_crit.dev_attr.attr, 293 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 294 &sensor_dev_attr_temp2_fault.dev_attr.attr, 295 &sensor_dev_attr_pwm1.dev_attr.attr, 296 &sensor_dev_attr_pwm1_mode.dev_attr.attr, 297 NULL 298 }; 299 300 static const struct attribute_group thmc50_group = { 301 .attrs = thmc50_attributes, 302 }; 303 304 /* for ADM1022 3rd temperature mode */ 305 static struct attribute *temp3_attributes[] = { 306 &sensor_dev_attr_temp3_max.dev_attr.attr, 307 &sensor_dev_attr_temp3_min.dev_attr.attr, 308 &sensor_dev_attr_temp3_input.dev_attr.attr, 309 &sensor_dev_attr_temp3_crit.dev_attr.attr, 310 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 311 &sensor_dev_attr_temp3_fault.dev_attr.attr, 312 NULL 313 }; 314 315 static const struct attribute_group temp3_group = { 316 .attrs = temp3_attributes, 317 }; 318 319 /* Return 0 if detection is successful, -ENODEV otherwise */ 320 static int thmc50_detect(struct i2c_client *client, 321 struct i2c_board_info *info) 322 { 323 unsigned company; 324 unsigned revision; 325 unsigned config; 326 struct i2c_adapter *adapter = client->adapter; 327 const char *type_name; 328 329 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 330 pr_debug("thmc50: detect failed, smbus byte data not supported!\n"); 331 return -ENODEV; 332 } 333 334 pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n", 335 client->addr, i2c_adapter_id(client->adapter)); 336 337 company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID); 338 revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE); 339 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 340 if (revision < 0xc0 || (config & 0x10)) 341 return -ENODEV; 342 343 if (company == 0x41) { 344 int id = i2c_adapter_id(client->adapter); 345 int i; 346 347 type_name = "adm1022"; 348 for (i = 0; i + 1 < adm1022_temp3_num; i += 2) 349 if (adm1022_temp3[i] == id && 350 adm1022_temp3[i + 1] == client->addr) { 351 /* enable 2nd remote temp */ 352 config |= (1 << 7); 353 i2c_smbus_write_byte_data(client, 354 THMC50_REG_CONF, 355 config); 356 break; 357 } 358 } else if (company == 0x49) { 359 type_name = "thmc50"; 360 } else { 361 pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n"); 362 return -ENODEV; 363 } 364 365 pr_debug("thmc50: Detected %s (version %x, revision %x)\n", 366 type_name, (revision >> 4) - 0xc, revision & 0xf); 367 368 strlcpy(info->type, type_name, I2C_NAME_SIZE); 369 370 return 0; 371 } 372 373 static void thmc50_init_client(struct thmc50_data *data) 374 { 375 struct i2c_client *client = data->client; 376 int config; 377 378 data->analog_out = i2c_smbus_read_byte_data(client, 379 THMC50_REG_ANALOG_OUT); 380 /* set up to at least 1 */ 381 if (data->analog_out == 0) { 382 data->analog_out = 1; 383 i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, 384 data->analog_out); 385 } 386 config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); 387 config |= 0x1; /* start the chip if it is in standby mode */ 388 if (data->type == adm1022 && (config & (1 << 7))) 389 data->has_temp3 = 1; 390 i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); 391 } 392 393 static int thmc50_probe(struct i2c_client *client, 394 const struct i2c_device_id *id) 395 { 396 struct device *dev = &client->dev; 397 struct thmc50_data *data; 398 struct device *hwmon_dev; 399 int idx = 0; 400 401 data = devm_kzalloc(dev, sizeof(struct thmc50_data), GFP_KERNEL); 402 if (!data) 403 return -ENOMEM; 404 405 data->client = client; 406 data->type = id->driver_data; 407 mutex_init(&data->update_lock); 408 409 thmc50_init_client(data); 410 411 /* sysfs hooks */ 412 data->groups[idx++] = &thmc50_group; 413 414 /* Register additional ADM1022 sysfs hooks */ 415 if (data->has_temp3) 416 data->groups[idx++] = &temp3_group; 417 418 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 419 data, data->groups); 420 return PTR_ERR_OR_ZERO(hwmon_dev); 421 } 422 423 static const struct i2c_device_id thmc50_id[] = { 424 { "adm1022", adm1022 }, 425 { "thmc50", thmc50 }, 426 { } 427 }; 428 MODULE_DEVICE_TABLE(i2c, thmc50_id); 429 430 static struct i2c_driver thmc50_driver = { 431 .class = I2C_CLASS_HWMON, 432 .driver = { 433 .name = "thmc50", 434 }, 435 .probe = thmc50_probe, 436 .id_table = thmc50_id, 437 .detect = thmc50_detect, 438 .address_list = normal_i2c, 439 }; 440 441 module_i2c_driver(thmc50_driver); 442 443 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>"); 444 MODULE_DESCRIPTION("THMC50 driver"); 445