Hans de Goede | ab2b79d | 2009-06-15 18:39:46 +0200 | [diff] [blame^] | 1 | /* tmp401.c |
| 2 | * |
| 3 | * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC. |
| 22 | * |
| 23 | * Note this IC is in some aspect similar to the LM90, but it has quite a |
| 24 | * few differences too, for example the local temp has a higher resolution |
| 25 | * and thus has 16 bits registers for its value and limit instead of 8 bits. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/jiffies.h> |
| 32 | #include <linux/i2c.h> |
| 33 | #include <linux/hwmon.h> |
| 34 | #include <linux/hwmon-sysfs.h> |
| 35 | #include <linux/err.h> |
| 36 | #include <linux/mutex.h> |
| 37 | #include <linux/sysfs.h> |
| 38 | |
| 39 | /* Addresses to scan */ |
| 40 | static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; |
| 41 | |
| 42 | /* Insmod parameters */ |
| 43 | I2C_CLIENT_INSMOD_1(tmp401); |
| 44 | |
| 45 | |
| 46 | /* |
| 47 | * The TMP401 registers, note some registers have different addresses for |
| 48 | * reading and writing |
| 49 | */ |
| 50 | #define TMP401_STATUS 0x02 |
| 51 | #define TMP401_CONFIG_READ 0x03 |
| 52 | #define TMP401_CONFIG_WRITE 0x09 |
| 53 | #define TMP401_CONVERSION_RATE_READ 0x04 |
| 54 | #define TMP401_CONVERSION_RATE_WRITE 0x0A |
| 55 | #define TMP401_TEMP_CRIT_HYST 0x21 |
| 56 | #define TMP401_CONSECUTIVE_ALERT 0x22 |
| 57 | #define TMP401_MANUFACTURER_ID_REG 0xFE |
| 58 | #define TMP401_DEVICE_ID_REG 0xFF |
| 59 | |
| 60 | static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 }; |
| 61 | static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 }; |
| 62 | static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 }; |
| 63 | static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E }; |
| 64 | static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 }; |
| 65 | static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 }; |
| 66 | static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D }; |
| 67 | static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 }; |
| 68 | /* These are called the THERM limit / hysteresis / mask in the datasheet */ |
| 69 | static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 }; |
| 70 | |
| 71 | /* Flags */ |
| 72 | #define TMP401_CONFIG_RANGE 0x04 |
| 73 | #define TMP401_CONFIG_SHUTDOWN 0x40 |
| 74 | #define TMP401_STATUS_LOCAL_CRIT 0x01 |
| 75 | #define TMP401_STATUS_REMOTE_CRIT 0x02 |
| 76 | #define TMP401_STATUS_REMOTE_OPEN 0x04 |
| 77 | #define TMP401_STATUS_REMOTE_LOW 0x08 |
| 78 | #define TMP401_STATUS_REMOTE_HIGH 0x10 |
| 79 | #define TMP401_STATUS_LOCAL_LOW 0x20 |
| 80 | #define TMP401_STATUS_LOCAL_HIGH 0x40 |
| 81 | |
| 82 | /* Manufacturer / Device ID's */ |
| 83 | #define TMP401_MANUFACTURER_ID 0x55 |
| 84 | #define TMP401_DEVICE_ID 0x11 |
| 85 | |
| 86 | /* |
| 87 | * Functions declarations |
| 88 | */ |
| 89 | |
| 90 | static int tmp401_probe(struct i2c_client *client, |
| 91 | const struct i2c_device_id *id); |
| 92 | static int tmp401_detect(struct i2c_client *client, int kind, |
| 93 | struct i2c_board_info *info); |
| 94 | static int tmp401_remove(struct i2c_client *client); |
| 95 | static struct tmp401_data *tmp401_update_device(struct device *dev); |
| 96 | |
| 97 | /* |
| 98 | * Driver data (common to all clients) |
| 99 | */ |
| 100 | |
| 101 | static const struct i2c_device_id tmp401_id[] = { |
| 102 | { "tmp401", tmp401 }, |
| 103 | { } |
| 104 | }; |
| 105 | MODULE_DEVICE_TABLE(i2c, tmp401_id); |
| 106 | |
| 107 | static struct i2c_driver tmp401_driver = { |
| 108 | .class = I2C_CLASS_HWMON, |
| 109 | .driver = { |
| 110 | .name = "tmp401", |
| 111 | }, |
| 112 | .probe = tmp401_probe, |
| 113 | .remove = tmp401_remove, |
| 114 | .id_table = tmp401_id, |
| 115 | .detect = tmp401_detect, |
| 116 | .address_data = &addr_data, |
| 117 | }; |
| 118 | |
| 119 | /* |
| 120 | * Client data (each client gets its own) |
| 121 | */ |
| 122 | |
| 123 | struct tmp401_data { |
| 124 | struct device *hwmon_dev; |
| 125 | struct mutex update_lock; |
| 126 | char valid; /* zero until following fields are valid */ |
| 127 | unsigned long last_updated; /* in jiffies */ |
| 128 | |
| 129 | /* register values */ |
| 130 | u8 status; |
| 131 | u8 config; |
| 132 | u16 temp[2]; |
| 133 | u16 temp_low[2]; |
| 134 | u16 temp_high[2]; |
| 135 | u8 temp_crit[2]; |
| 136 | u8 temp_crit_hyst; |
| 137 | }; |
| 138 | |
| 139 | /* |
| 140 | * Sysfs attr show / store functions |
| 141 | */ |
| 142 | |
| 143 | static int tmp401_register_to_temp(u16 reg, u8 config) |
| 144 | { |
| 145 | int temp = reg; |
| 146 | |
| 147 | if (config & TMP401_CONFIG_RANGE) |
| 148 | temp -= 64 * 256; |
| 149 | |
| 150 | return (temp * 625 + 80) / 160; |
| 151 | } |
| 152 | |
| 153 | static u16 tmp401_temp_to_register(long temp, u8 config) |
| 154 | { |
| 155 | if (config & TMP401_CONFIG_RANGE) { |
| 156 | temp = SENSORS_LIMIT(temp, -64000, 191000); |
| 157 | temp += 64000; |
| 158 | } else |
| 159 | temp = SENSORS_LIMIT(temp, 0, 127000); |
| 160 | |
| 161 | return (temp * 160 + 312) / 625; |
| 162 | } |
| 163 | |
| 164 | static int tmp401_crit_register_to_temp(u8 reg, u8 config) |
| 165 | { |
| 166 | int temp = reg; |
| 167 | |
| 168 | if (config & TMP401_CONFIG_RANGE) |
| 169 | temp -= 64; |
| 170 | |
| 171 | return temp * 1000; |
| 172 | } |
| 173 | |
| 174 | static u8 tmp401_crit_temp_to_register(long temp, u8 config) |
| 175 | { |
| 176 | if (config & TMP401_CONFIG_RANGE) { |
| 177 | temp = SENSORS_LIMIT(temp, -64000, 191000); |
| 178 | temp += 64000; |
| 179 | } else |
| 180 | temp = SENSORS_LIMIT(temp, 0, 127000); |
| 181 | |
| 182 | return (temp + 500) / 1000; |
| 183 | } |
| 184 | |
| 185 | static ssize_t show_temp_value(struct device *dev, |
| 186 | struct device_attribute *devattr, char *buf) |
| 187 | { |
| 188 | int index = to_sensor_dev_attr(devattr)->index; |
| 189 | struct tmp401_data *data = tmp401_update_device(dev); |
| 190 | |
| 191 | return sprintf(buf, "%d\n", |
| 192 | tmp401_register_to_temp(data->temp[index], data->config)); |
| 193 | } |
| 194 | |
| 195 | static ssize_t show_temp_min(struct device *dev, |
| 196 | struct device_attribute *devattr, char *buf) |
| 197 | { |
| 198 | int index = to_sensor_dev_attr(devattr)->index; |
| 199 | struct tmp401_data *data = tmp401_update_device(dev); |
| 200 | |
| 201 | return sprintf(buf, "%d\n", |
| 202 | tmp401_register_to_temp(data->temp_low[index], data->config)); |
| 203 | } |
| 204 | |
| 205 | static ssize_t show_temp_max(struct device *dev, |
| 206 | struct device_attribute *devattr, char *buf) |
| 207 | { |
| 208 | int index = to_sensor_dev_attr(devattr)->index; |
| 209 | struct tmp401_data *data = tmp401_update_device(dev); |
| 210 | |
| 211 | return sprintf(buf, "%d\n", |
| 212 | tmp401_register_to_temp(data->temp_high[index], data->config)); |
| 213 | } |
| 214 | |
| 215 | static ssize_t show_temp_crit(struct device *dev, |
| 216 | struct device_attribute *devattr, char *buf) |
| 217 | { |
| 218 | int index = to_sensor_dev_attr(devattr)->index; |
| 219 | struct tmp401_data *data = tmp401_update_device(dev); |
| 220 | |
| 221 | return sprintf(buf, "%d\n", |
| 222 | tmp401_crit_register_to_temp(data->temp_crit[index], |
| 223 | data->config)); |
| 224 | } |
| 225 | |
| 226 | static ssize_t show_temp_crit_hyst(struct device *dev, |
| 227 | struct device_attribute *devattr, char *buf) |
| 228 | { |
| 229 | int temp, index = to_sensor_dev_attr(devattr)->index; |
| 230 | struct tmp401_data *data = tmp401_update_device(dev); |
| 231 | |
| 232 | mutex_lock(&data->update_lock); |
| 233 | temp = tmp401_crit_register_to_temp(data->temp_crit[index], |
| 234 | data->config); |
| 235 | temp -= data->temp_crit_hyst * 1000; |
| 236 | mutex_unlock(&data->update_lock); |
| 237 | |
| 238 | return sprintf(buf, "%d\n", temp); |
| 239 | } |
| 240 | |
| 241 | static ssize_t show_status(struct device *dev, |
| 242 | struct device_attribute *devattr, char *buf) |
| 243 | { |
| 244 | int mask = to_sensor_dev_attr(devattr)->index; |
| 245 | struct tmp401_data *data = tmp401_update_device(dev); |
| 246 | |
| 247 | if (data->status & mask) |
| 248 | return sprintf(buf, "1\n"); |
| 249 | else |
| 250 | return sprintf(buf, "0\n"); |
| 251 | } |
| 252 | |
| 253 | static ssize_t store_temp_min(struct device *dev, struct device_attribute |
| 254 | *devattr, const char *buf, size_t count) |
| 255 | { |
| 256 | int index = to_sensor_dev_attr(devattr)->index; |
| 257 | struct tmp401_data *data = tmp401_update_device(dev); |
| 258 | long val; |
| 259 | u16 reg; |
| 260 | |
| 261 | if (strict_strtol(buf, 10, &val)) |
| 262 | return -EINVAL; |
| 263 | |
| 264 | reg = tmp401_temp_to_register(val, data->config); |
| 265 | |
| 266 | mutex_lock(&data->update_lock); |
| 267 | |
| 268 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 269 | TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8); |
| 270 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 271 | TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF); |
| 272 | |
| 273 | data->temp_low[index] = reg; |
| 274 | |
| 275 | mutex_unlock(&data->update_lock); |
| 276 | |
| 277 | return count; |
| 278 | } |
| 279 | |
| 280 | static ssize_t store_temp_max(struct device *dev, struct device_attribute |
| 281 | *devattr, const char *buf, size_t count) |
| 282 | { |
| 283 | int index = to_sensor_dev_attr(devattr)->index; |
| 284 | struct tmp401_data *data = tmp401_update_device(dev); |
| 285 | long val; |
| 286 | u16 reg; |
| 287 | |
| 288 | if (strict_strtol(buf, 10, &val)) |
| 289 | return -EINVAL; |
| 290 | |
| 291 | reg = tmp401_temp_to_register(val, data->config); |
| 292 | |
| 293 | mutex_lock(&data->update_lock); |
| 294 | |
| 295 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 296 | TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8); |
| 297 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 298 | TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF); |
| 299 | |
| 300 | data->temp_high[index] = reg; |
| 301 | |
| 302 | mutex_unlock(&data->update_lock); |
| 303 | |
| 304 | return count; |
| 305 | } |
| 306 | |
| 307 | static ssize_t store_temp_crit(struct device *dev, struct device_attribute |
| 308 | *devattr, const char *buf, size_t count) |
| 309 | { |
| 310 | int index = to_sensor_dev_attr(devattr)->index; |
| 311 | struct tmp401_data *data = tmp401_update_device(dev); |
| 312 | long val; |
| 313 | u8 reg; |
| 314 | |
| 315 | if (strict_strtol(buf, 10, &val)) |
| 316 | return -EINVAL; |
| 317 | |
| 318 | reg = tmp401_crit_temp_to_register(val, data->config); |
| 319 | |
| 320 | mutex_lock(&data->update_lock); |
| 321 | |
| 322 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 323 | TMP401_TEMP_CRIT_LIMIT[index], reg); |
| 324 | |
| 325 | data->temp_crit[index] = reg; |
| 326 | |
| 327 | mutex_unlock(&data->update_lock); |
| 328 | |
| 329 | return count; |
| 330 | } |
| 331 | |
| 332 | static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute |
| 333 | *devattr, const char *buf, size_t count) |
| 334 | { |
| 335 | int temp, index = to_sensor_dev_attr(devattr)->index; |
| 336 | struct tmp401_data *data = tmp401_update_device(dev); |
| 337 | long val; |
| 338 | u8 reg; |
| 339 | |
| 340 | if (strict_strtol(buf, 10, &val)) |
| 341 | return -EINVAL; |
| 342 | |
| 343 | if (data->config & TMP401_CONFIG_RANGE) |
| 344 | val = SENSORS_LIMIT(val, -64000, 191000); |
| 345 | else |
| 346 | val = SENSORS_LIMIT(val, 0, 127000); |
| 347 | |
| 348 | mutex_lock(&data->update_lock); |
| 349 | temp = tmp401_crit_register_to_temp(data->temp_crit[index], |
| 350 | data->config); |
| 351 | val = SENSORS_LIMIT(val, temp - 255000, temp); |
| 352 | reg = ((temp - val) + 500) / 1000; |
| 353 | |
| 354 | i2c_smbus_write_byte_data(to_i2c_client(dev), |
| 355 | TMP401_TEMP_CRIT_HYST, reg); |
| 356 | |
| 357 | data->temp_crit_hyst = reg; |
| 358 | |
| 359 | mutex_unlock(&data->update_lock); |
| 360 | |
| 361 | return count; |
| 362 | } |
| 363 | |
| 364 | static struct sensor_device_attribute tmp401_attr[] = { |
| 365 | SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), |
| 366 | SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0), |
| 367 | SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0), |
| 368 | SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0), |
| 369 | SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst, |
| 370 | store_temp_crit_hyst, 0), |
| 371 | SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL, |
| 372 | TMP401_STATUS_LOCAL_LOW), |
| 373 | SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL, |
| 374 | TMP401_STATUS_LOCAL_HIGH), |
| 375 | SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL, |
| 376 | TMP401_STATUS_LOCAL_CRIT), |
| 377 | SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), |
| 378 | SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1), |
| 379 | SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1), |
| 380 | SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1), |
| 381 | SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1), |
| 382 | SENSOR_ATTR(temp2_fault, 0444, show_status, NULL, |
| 383 | TMP401_STATUS_REMOTE_OPEN), |
| 384 | SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL, |
| 385 | TMP401_STATUS_REMOTE_LOW), |
| 386 | SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL, |
| 387 | TMP401_STATUS_REMOTE_HIGH), |
| 388 | SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL, |
| 389 | TMP401_STATUS_REMOTE_CRIT), |
| 390 | }; |
| 391 | |
| 392 | /* |
| 393 | * Begin non sysfs callback code (aka Real code) |
| 394 | */ |
| 395 | |
| 396 | static void tmp401_init_client(struct i2c_client *client) |
| 397 | { |
| 398 | int config, config_orig; |
| 399 | |
| 400 | /* Set the conversion rate to 2 Hz */ |
| 401 | i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5); |
| 402 | |
| 403 | /* Start conversions (disable shutdown if necessary) */ |
| 404 | config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); |
| 405 | if (config < 0) { |
| 406 | dev_warn(&client->dev, "Initialization failed!\n"); |
| 407 | return; |
| 408 | } |
| 409 | |
| 410 | config_orig = config; |
| 411 | config &= ~TMP401_CONFIG_SHUTDOWN; |
| 412 | |
| 413 | if (config != config_orig) |
| 414 | i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config); |
| 415 | } |
| 416 | |
| 417 | static int tmp401_detect(struct i2c_client *client, int kind, |
| 418 | struct i2c_board_info *info) |
| 419 | { |
| 420 | struct i2c_adapter *adapter = client->adapter; |
| 421 | |
| 422 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| 423 | return -ENODEV; |
| 424 | |
| 425 | /* Detect and identify the chip */ |
| 426 | if (kind <= 0) { |
| 427 | u8 reg; |
| 428 | |
| 429 | reg = i2c_smbus_read_byte_data(client, |
| 430 | TMP401_MANUFACTURER_ID_REG); |
| 431 | if (reg != TMP401_MANUFACTURER_ID) |
| 432 | return -ENODEV; |
| 433 | |
| 434 | reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG); |
| 435 | if (reg != TMP401_DEVICE_ID) |
| 436 | return -ENODEV; |
| 437 | |
| 438 | reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); |
| 439 | if (reg & 0x1b) |
| 440 | return -ENODEV; |
| 441 | |
| 442 | reg = i2c_smbus_read_byte_data(client, |
| 443 | TMP401_CONVERSION_RATE_READ); |
| 444 | if (reg > 15) |
| 445 | return -ENODEV; |
| 446 | } |
| 447 | strlcpy(info->type, "tmp401", I2C_NAME_SIZE); |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | static int tmp401_probe(struct i2c_client *client, |
| 453 | const struct i2c_device_id *id) |
| 454 | { |
| 455 | int i, err = 0; |
| 456 | struct tmp401_data *data; |
| 457 | |
| 458 | data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL); |
| 459 | if (!data) |
| 460 | return -ENOMEM; |
| 461 | |
| 462 | i2c_set_clientdata(client, data); |
| 463 | mutex_init(&data->update_lock); |
| 464 | |
| 465 | /* Initialize the TMP401 chip */ |
| 466 | tmp401_init_client(client); |
| 467 | |
| 468 | /* Register sysfs hooks */ |
| 469 | for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) { |
| 470 | err = device_create_file(&client->dev, |
| 471 | &tmp401_attr[i].dev_attr); |
| 472 | if (err) |
| 473 | goto exit_remove; |
| 474 | } |
| 475 | |
| 476 | data->hwmon_dev = hwmon_device_register(&client->dev); |
| 477 | if (IS_ERR(data->hwmon_dev)) { |
| 478 | err = PTR_ERR(data->hwmon_dev); |
| 479 | data->hwmon_dev = NULL; |
| 480 | goto exit_remove; |
| 481 | } |
| 482 | |
| 483 | dev_info(&client->dev, "Detected TI TMP401 chip\n"); |
| 484 | |
| 485 | return 0; |
| 486 | |
| 487 | exit_remove: |
| 488 | tmp401_remove(client); /* will also free data for us */ |
| 489 | return err; |
| 490 | } |
| 491 | |
| 492 | static int tmp401_remove(struct i2c_client *client) |
| 493 | { |
| 494 | struct tmp401_data *data = i2c_get_clientdata(client); |
| 495 | int i; |
| 496 | |
| 497 | if (data->hwmon_dev) |
| 498 | hwmon_device_unregister(data->hwmon_dev); |
| 499 | |
| 500 | for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) |
| 501 | device_remove_file(&client->dev, &tmp401_attr[i].dev_attr); |
| 502 | |
| 503 | kfree(data); |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | static struct tmp401_data *tmp401_update_device(struct device *dev) |
| 508 | { |
| 509 | struct i2c_client *client = to_i2c_client(dev); |
| 510 | struct tmp401_data *data = i2c_get_clientdata(client); |
| 511 | int i; |
| 512 | |
| 513 | mutex_lock(&data->update_lock); |
| 514 | |
| 515 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
| 516 | data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS); |
| 517 | data->config = i2c_smbus_read_byte_data(client, |
| 518 | TMP401_CONFIG_READ); |
| 519 | for (i = 0; i < 2; i++) { |
| 520 | /* High byte must be read first immediately followed |
| 521 | by the low byte */ |
| 522 | data->temp[i] = i2c_smbus_read_byte_data(client, |
| 523 | TMP401_TEMP_MSB[i]) << 8; |
| 524 | data->temp[i] |= i2c_smbus_read_byte_data(client, |
| 525 | TMP401_TEMP_LSB[i]); |
| 526 | data->temp_low[i] = i2c_smbus_read_byte_data(client, |
| 527 | TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8; |
| 528 | data->temp_low[i] |= i2c_smbus_read_byte_data(client, |
| 529 | TMP401_TEMP_LOW_LIMIT_LSB[i]); |
| 530 | data->temp_high[i] = i2c_smbus_read_byte_data(client, |
| 531 | TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8; |
| 532 | data->temp_high[i] |= i2c_smbus_read_byte_data(client, |
| 533 | TMP401_TEMP_HIGH_LIMIT_LSB[i]); |
| 534 | data->temp_crit[i] = i2c_smbus_read_byte_data(client, |
| 535 | TMP401_TEMP_CRIT_LIMIT[i]); |
| 536 | } |
| 537 | |
| 538 | data->temp_crit_hyst = i2c_smbus_read_byte_data(client, |
| 539 | TMP401_TEMP_CRIT_HYST); |
| 540 | |
| 541 | data->last_updated = jiffies; |
| 542 | data->valid = 1; |
| 543 | } |
| 544 | |
| 545 | mutex_unlock(&data->update_lock); |
| 546 | |
| 547 | return data; |
| 548 | } |
| 549 | |
| 550 | static int __init tmp401_init(void) |
| 551 | { |
| 552 | return i2c_add_driver(&tmp401_driver); |
| 553 | } |
| 554 | |
| 555 | static void __exit tmp401_exit(void) |
| 556 | { |
| 557 | i2c_del_driver(&tmp401_driver); |
| 558 | } |
| 559 | |
| 560 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); |
| 561 | MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver"); |
| 562 | MODULE_LICENSE("GPL"); |
| 563 | |
| 564 | module_init(tmp401_init); |
| 565 | module_exit(tmp401_exit); |