Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | lm77.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | monitoring |
| 4 | |
| 5 | Copyright (c) 2004 Andras BALI <drewie@freemail.hu> |
| 6 | |
| 7 | Heavily based on lm75.c by Frodo Looijaard <frodol@dds.nl>. The LM77 |
| 8 | is a temperature sensor and thermal window comparator with 0.5 deg |
| 9 | resolution made by National Semiconductor. Complete datasheet can be |
| 10 | obtained at their site: |
| 11 | http://www.national.com/pf/LM/LM77.html |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 33 | #include <linux/hwmon.h> |
| 34 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | /* Addresses to scan */ |
| 37 | static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | /* Insmod parameters */ |
Jean Delvare | f4b5026 | 2005-07-31 21:49:03 +0200 | [diff] [blame] | 40 | I2C_CLIENT_INSMOD_1(lm77); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | /* The LM77 registers */ |
| 43 | #define LM77_REG_TEMP 0x00 |
| 44 | #define LM77_REG_CONF 0x01 |
| 45 | #define LM77_REG_TEMP_HYST 0x02 |
| 46 | #define LM77_REG_TEMP_CRIT 0x03 |
| 47 | #define LM77_REG_TEMP_MIN 0x04 |
| 48 | #define LM77_REG_TEMP_MAX 0x05 |
| 49 | |
| 50 | /* Each client has this additional data */ |
| 51 | struct lm77_data { |
| 52 | struct i2c_client client; |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 53 | struct class_device *class_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | struct semaphore update_lock; |
| 55 | char valid; |
| 56 | unsigned long last_updated; /* In jiffies */ |
| 57 | int temp_input; /* Temperatures */ |
| 58 | int temp_crit; |
| 59 | int temp_min; |
| 60 | int temp_max; |
| 61 | int temp_hyst; |
| 62 | u8 alarms; |
| 63 | }; |
| 64 | |
| 65 | static int lm77_attach_adapter(struct i2c_adapter *adapter); |
| 66 | static int lm77_detect(struct i2c_adapter *adapter, int address, int kind); |
| 67 | static void lm77_init_client(struct i2c_client *client); |
| 68 | static int lm77_detach_client(struct i2c_client *client); |
| 69 | static u16 lm77_read_value(struct i2c_client *client, u8 reg); |
| 70 | static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value); |
| 71 | |
| 72 | static struct lm77_data *lm77_update_device(struct device *dev); |
| 73 | |
| 74 | |
| 75 | /* This is the driver that will be inserted */ |
| 76 | static struct i2c_driver lm77_driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 77 | .driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 78 | .name = "lm77", |
| 79 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | .attach_adapter = lm77_attach_adapter, |
| 81 | .detach_client = lm77_detach_client, |
| 82 | }; |
| 83 | |
| 84 | /* straight from the datasheet */ |
| 85 | #define LM77_TEMP_MIN (-55000) |
| 86 | #define LM77_TEMP_MAX 125000 |
| 87 | |
| 88 | /* In the temperature registers, the low 3 bits are not part of the |
| 89 | temperature values; they are the status bits. */ |
| 90 | static inline u16 LM77_TEMP_TO_REG(int temp) |
| 91 | { |
| 92 | int ntemp = SENSORS_LIMIT(temp, LM77_TEMP_MIN, LM77_TEMP_MAX); |
| 93 | return (u16)((ntemp / 500) * 8); |
| 94 | } |
| 95 | |
| 96 | static inline int LM77_TEMP_FROM_REG(u16 reg) |
| 97 | { |
| 98 | return ((int)reg / 8) * 500; |
| 99 | } |
| 100 | |
| 101 | /* sysfs stuff */ |
| 102 | |
| 103 | /* read routines for temperature limits */ |
| 104 | #define show(value) \ |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 105 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { \ |
| 107 | struct lm77_data *data = lm77_update_device(dev); \ |
| 108 | return sprintf(buf, "%d\n", data->value); \ |
| 109 | } |
| 110 | |
| 111 | show(temp_input); |
| 112 | show(temp_crit); |
| 113 | show(temp_min); |
| 114 | show(temp_max); |
| 115 | show(alarms); |
| 116 | |
| 117 | /* read routines for hysteresis values */ |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 118 | static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
| 120 | struct lm77_data *data = lm77_update_device(dev); |
| 121 | return sprintf(buf, "%d\n", data->temp_crit - data->temp_hyst); |
| 122 | } |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 123 | static ssize_t show_temp_min_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
| 125 | struct lm77_data *data = lm77_update_device(dev); |
| 126 | return sprintf(buf, "%d\n", data->temp_min + data->temp_hyst); |
| 127 | } |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 128 | static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
| 130 | struct lm77_data *data = lm77_update_device(dev); |
| 131 | return sprintf(buf, "%d\n", data->temp_max - data->temp_hyst); |
| 132 | } |
| 133 | |
| 134 | /* write routines */ |
| 135 | #define set(value, reg) \ |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 136 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { \ |
| 138 | struct i2c_client *client = to_i2c_client(dev); \ |
| 139 | struct lm77_data *data = i2c_get_clientdata(client); \ |
| 140 | long val = simple_strtoul(buf, NULL, 10); \ |
| 141 | \ |
| 142 | down(&data->update_lock); \ |
| 143 | data->value = val; \ |
| 144 | lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \ |
| 145 | up(&data->update_lock); \ |
| 146 | return count; \ |
| 147 | } |
| 148 | |
| 149 | set(temp_min, LM77_REG_TEMP_MIN); |
| 150 | set(temp_max, LM77_REG_TEMP_MAX); |
| 151 | |
| 152 | /* hysteresis is stored as a relative value on the chip, so it has to be |
| 153 | converted first */ |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 154 | static ssize_t set_temp_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | struct i2c_client *client = to_i2c_client(dev); |
| 157 | struct lm77_data *data = i2c_get_clientdata(client); |
| 158 | unsigned long val = simple_strtoul(buf, NULL, 10); |
| 159 | |
| 160 | down(&data->update_lock); |
| 161 | data->temp_hyst = data->temp_crit - val; |
| 162 | lm77_write_value(client, LM77_REG_TEMP_HYST, |
| 163 | LM77_TEMP_TO_REG(data->temp_hyst)); |
| 164 | up(&data->update_lock); |
| 165 | return count; |
| 166 | } |
| 167 | |
| 168 | /* preserve hysteresis when setting T_crit */ |
Yani Ioannou | 8627f9b | 2005-05-17 06:42:03 -0400 | [diff] [blame] | 169 | static ssize_t set_temp_crit(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | struct i2c_client *client = to_i2c_client(dev); |
| 172 | struct lm77_data *data = i2c_get_clientdata(client); |
| 173 | long val = simple_strtoul(buf, NULL, 10); |
| 174 | int oldcrithyst; |
| 175 | |
| 176 | down(&data->update_lock); |
| 177 | oldcrithyst = data->temp_crit - data->temp_hyst; |
| 178 | data->temp_crit = val; |
| 179 | data->temp_hyst = data->temp_crit - oldcrithyst; |
| 180 | lm77_write_value(client, LM77_REG_TEMP_CRIT, |
| 181 | LM77_TEMP_TO_REG(data->temp_crit)); |
| 182 | lm77_write_value(client, LM77_REG_TEMP_HYST, |
| 183 | LM77_TEMP_TO_REG(data->temp_hyst)); |
| 184 | up(&data->update_lock); |
| 185 | return count; |
| 186 | } |
| 187 | |
| 188 | static DEVICE_ATTR(temp1_input, S_IRUGO, |
| 189 | show_temp_input, NULL); |
| 190 | static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, |
| 191 | show_temp_crit, set_temp_crit); |
| 192 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, |
| 193 | show_temp_min, set_temp_min); |
| 194 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
| 195 | show_temp_max, set_temp_max); |
| 196 | |
| 197 | static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, |
| 198 | show_temp_crit_hyst, set_temp_crit_hyst); |
| 199 | static DEVICE_ATTR(temp1_min_hyst, S_IRUGO, |
| 200 | show_temp_min_hyst, NULL); |
| 201 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, |
| 202 | show_temp_max_hyst, NULL); |
| 203 | |
| 204 | static DEVICE_ATTR(alarms, S_IRUGO, |
| 205 | show_alarms, NULL); |
| 206 | |
| 207 | static int lm77_attach_adapter(struct i2c_adapter *adapter) |
| 208 | { |
| 209 | if (!(adapter->class & I2C_CLASS_HWMON)) |
| 210 | return 0; |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 211 | return i2c_probe(adapter, &addr_data, lm77_detect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 214 | /* This function is called by i2c_probe */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | static int lm77_detect(struct i2c_adapter *adapter, int address, int kind) |
| 216 | { |
| 217 | struct i2c_client *new_client; |
| 218 | struct lm77_data *data; |
| 219 | int err = 0; |
| 220 | const char *name = ""; |
| 221 | |
| 222 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
| 223 | I2C_FUNC_SMBUS_WORD_DATA)) |
| 224 | goto exit; |
| 225 | |
| 226 | /* OK. For now, we presume we have a valid client. We now create the |
| 227 | client structure, even though we cannot fill it completely yet. |
| 228 | But it allows us to access lm77_{read,write}_value. */ |
Deepak Saxena | ba9c2e8 | 2005-10-17 23:08:32 +0200 | [diff] [blame] | 229 | if (!(data = kzalloc(sizeof(struct lm77_data), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | err = -ENOMEM; |
| 231 | goto exit; |
| 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | new_client = &data->client; |
| 235 | i2c_set_clientdata(new_client, data); |
| 236 | new_client->addr = address; |
| 237 | new_client->adapter = adapter; |
| 238 | new_client->driver = &lm77_driver; |
| 239 | new_client->flags = 0; |
| 240 | |
| 241 | /* Here comes the remaining detection. Since the LM77 has no |
| 242 | register dedicated to identification, we have to rely on the |
| 243 | following tricks: |
| 244 | |
| 245 | 1. the high 4 bits represent the sign and thus they should |
| 246 | always be the same |
| 247 | 2. the high 3 bits are unused in the configuration register |
| 248 | 3. addresses 0x06 and 0x07 return the last read value |
| 249 | 4. registers cycling over 8-address boundaries |
| 250 | |
| 251 | Word-sized registers are high-byte first. */ |
| 252 | if (kind < 0) { |
| 253 | int i, cur, conf, hyst, crit, min, max; |
| 254 | |
| 255 | /* addresses cycling */ |
| 256 | cur = i2c_smbus_read_word_data(new_client, 0); |
| 257 | conf = i2c_smbus_read_byte_data(new_client, 1); |
| 258 | hyst = i2c_smbus_read_word_data(new_client, 2); |
| 259 | crit = i2c_smbus_read_word_data(new_client, 3); |
| 260 | min = i2c_smbus_read_word_data(new_client, 4); |
| 261 | max = i2c_smbus_read_word_data(new_client, 5); |
| 262 | for (i = 8; i <= 0xff; i += 8) |
| 263 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
| 264 | || i2c_smbus_read_word_data(new_client, i + 2) != hyst |
| 265 | || i2c_smbus_read_word_data(new_client, i + 3) != crit |
| 266 | || i2c_smbus_read_word_data(new_client, i + 4) != min |
| 267 | || i2c_smbus_read_word_data(new_client, i + 5) != max) |
| 268 | goto exit_free; |
| 269 | |
| 270 | /* sign bits */ |
| 271 | if (((cur & 0x00f0) != 0xf0 && (cur & 0x00f0) != 0x0) |
| 272 | || ((hyst & 0x00f0) != 0xf0 && (hyst & 0x00f0) != 0x0) |
| 273 | || ((crit & 0x00f0) != 0xf0 && (crit & 0x00f0) != 0x0) |
| 274 | || ((min & 0x00f0) != 0xf0 && (min & 0x00f0) != 0x0) |
| 275 | || ((max & 0x00f0) != 0xf0 && (max & 0x00f0) != 0x0)) |
| 276 | goto exit_free; |
| 277 | |
| 278 | /* unused bits */ |
| 279 | if (conf & 0xe0) |
| 280 | goto exit_free; |
| 281 | |
| 282 | /* 0x06 and 0x07 return the last read value */ |
| 283 | cur = i2c_smbus_read_word_data(new_client, 0); |
| 284 | if (i2c_smbus_read_word_data(new_client, 6) != cur |
| 285 | || i2c_smbus_read_word_data(new_client, 7) != cur) |
| 286 | goto exit_free; |
| 287 | hyst = i2c_smbus_read_word_data(new_client, 2); |
| 288 | if (i2c_smbus_read_word_data(new_client, 6) != hyst |
| 289 | || i2c_smbus_read_word_data(new_client, 7) != hyst) |
| 290 | goto exit_free; |
| 291 | min = i2c_smbus_read_word_data(new_client, 4); |
| 292 | if (i2c_smbus_read_word_data(new_client, 6) != min |
| 293 | || i2c_smbus_read_word_data(new_client, 7) != min) |
| 294 | goto exit_free; |
| 295 | |
| 296 | } |
| 297 | |
| 298 | /* Determine the chip type - only one kind supported! */ |
| 299 | if (kind <= 0) |
| 300 | kind = lm77; |
| 301 | |
| 302 | if (kind == lm77) { |
| 303 | name = "lm77"; |
| 304 | } |
| 305 | |
| 306 | /* Fill in the remaining client fields and put it into the global list */ |
| 307 | strlcpy(new_client->name, name, I2C_NAME_SIZE); |
| 308 | data->valid = 0; |
| 309 | init_MUTEX(&data->update_lock); |
| 310 | |
| 311 | /* Tell the I2C layer a new client has arrived */ |
| 312 | if ((err = i2c_attach_client(new_client))) |
| 313 | goto exit_free; |
| 314 | |
| 315 | /* Initialize the LM77 chip */ |
| 316 | lm77_init_client(new_client); |
| 317 | |
| 318 | /* Register sysfs hooks */ |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 319 | data->class_dev = hwmon_device_register(&new_client->dev); |
| 320 | if (IS_ERR(data->class_dev)) { |
| 321 | err = PTR_ERR(data->class_dev); |
| 322 | goto exit_detach; |
| 323 | } |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | device_create_file(&new_client->dev, &dev_attr_temp1_input); |
| 326 | device_create_file(&new_client->dev, &dev_attr_temp1_crit); |
| 327 | device_create_file(&new_client->dev, &dev_attr_temp1_min); |
| 328 | device_create_file(&new_client->dev, &dev_attr_temp1_max); |
| 329 | device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); |
| 330 | device_create_file(&new_client->dev, &dev_attr_temp1_min_hyst); |
| 331 | device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); |
| 332 | device_create_file(&new_client->dev, &dev_attr_alarms); |
| 333 | return 0; |
| 334 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 335 | exit_detach: |
| 336 | i2c_detach_client(new_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | exit_free: |
| 338 | kfree(data); |
| 339 | exit: |
| 340 | return err; |
| 341 | } |
| 342 | |
| 343 | static int lm77_detach_client(struct i2c_client *client) |
| 344 | { |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 345 | struct lm77_data *data = i2c_get_clientdata(client); |
| 346 | hwmon_device_unregister(data->class_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | i2c_detach_client(client); |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 348 | kfree(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | /* All registers are word-sized, except for the configuration register. |
| 353 | The LM77 uses the high-byte first convention. */ |
| 354 | static u16 lm77_read_value(struct i2c_client *client, u8 reg) |
| 355 | { |
| 356 | if (reg == LM77_REG_CONF) |
| 357 | return i2c_smbus_read_byte_data(client, reg); |
| 358 | else |
| 359 | return swab16(i2c_smbus_read_word_data(client, reg)); |
| 360 | } |
| 361 | |
| 362 | static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value) |
| 363 | { |
| 364 | if (reg == LM77_REG_CONF) |
| 365 | return i2c_smbus_write_byte_data(client, reg, value); |
| 366 | else |
| 367 | return i2c_smbus_write_word_data(client, reg, swab16(value)); |
| 368 | } |
| 369 | |
| 370 | static void lm77_init_client(struct i2c_client *client) |
| 371 | { |
| 372 | /* Initialize the LM77 chip - turn off shutdown mode */ |
| 373 | int conf = lm77_read_value(client, LM77_REG_CONF); |
| 374 | if (conf & 1) |
| 375 | lm77_write_value(client, LM77_REG_CONF, conf & 0xfe); |
| 376 | } |
| 377 | |
| 378 | static struct lm77_data *lm77_update_device(struct device *dev) |
| 379 | { |
| 380 | struct i2c_client *client = to_i2c_client(dev); |
| 381 | struct lm77_data *data = i2c_get_clientdata(client); |
| 382 | |
| 383 | down(&data->update_lock); |
| 384 | |
| 385 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
| 386 | || !data->valid) { |
| 387 | dev_dbg(&client->dev, "Starting lm77 update\n"); |
| 388 | data->temp_input = |
| 389 | LM77_TEMP_FROM_REG(lm77_read_value(client, |
| 390 | LM77_REG_TEMP)); |
| 391 | data->temp_hyst = |
| 392 | LM77_TEMP_FROM_REG(lm77_read_value(client, |
| 393 | LM77_REG_TEMP_HYST)); |
| 394 | data->temp_crit = |
| 395 | LM77_TEMP_FROM_REG(lm77_read_value(client, |
| 396 | LM77_REG_TEMP_CRIT)); |
| 397 | data->temp_min = |
| 398 | LM77_TEMP_FROM_REG(lm77_read_value(client, |
| 399 | LM77_REG_TEMP_MIN)); |
| 400 | data->temp_max = |
| 401 | LM77_TEMP_FROM_REG(lm77_read_value(client, |
| 402 | LM77_REG_TEMP_MAX)); |
| 403 | data->alarms = |
| 404 | lm77_read_value(client, LM77_REG_TEMP) & 0x0007; |
| 405 | data->last_updated = jiffies; |
| 406 | data->valid = 1; |
| 407 | } |
| 408 | |
| 409 | up(&data->update_lock); |
| 410 | |
| 411 | return data; |
| 412 | } |
| 413 | |
| 414 | static int __init sensors_lm77_init(void) |
| 415 | { |
| 416 | return i2c_add_driver(&lm77_driver); |
| 417 | } |
| 418 | |
| 419 | static void __exit sensors_lm77_exit(void) |
| 420 | { |
| 421 | i2c_del_driver(&lm77_driver); |
| 422 | } |
| 423 | |
| 424 | MODULE_AUTHOR("Andras BALI <drewie@freemail.hu>"); |
| 425 | MODULE_DESCRIPTION("LM77 driver"); |
| 426 | MODULE_LICENSE("GPL"); |
| 427 | |
| 428 | module_init(sensors_lm77_init); |
| 429 | module_exit(sensors_lm77_exit); |