Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * lm83.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | * monitoring |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 4 | * Copyright (C) 2003-2005 Jean Delvare <khali@linux-fr.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is |
| 7 | * a sensor chip made by National Semiconductor. It reports up to four |
| 8 | * temperatures (its own plus up to three external ones) with a 1 deg |
| 9 | * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained |
| 10 | * from National's website at: |
| 11 | * http://www.national.com/pf/LM/LM83.html |
| 12 | * Since the datasheet omits to give the chip stepping code, I give it |
| 13 | * here: 0x03 (at register 0xff). |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, write to the Free Software |
| 27 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 28 | */ |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/module.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/jiffies.h> |
| 34 | #include <linux/i2c.h> |
Jean Delvare | 10c08f8 | 2005-06-06 19:34:45 +0200 | [diff] [blame] | 35 | #include <linux/hwmon-sysfs.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 36 | #include <linux/hwmon.h> |
| 37 | #include <linux/err.h> |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | /* |
| 41 | * Addresses to scan |
| 42 | * Address is selected using 2 three-level pins, resulting in 9 possible |
| 43 | * addresses. |
| 44 | */ |
| 45 | |
| 46 | static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, |
| 47 | 0x29, 0x2a, 0x2b, |
| 48 | 0x4c, 0x4d, 0x4e, |
| 49 | I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /* |
| 52 | * Insmod parameters |
| 53 | */ |
| 54 | |
Jean Delvare | f4b5026 | 2005-07-31 21:49:03 +0200 | [diff] [blame] | 55 | I2C_CLIENT_INSMOD_1(lm83); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * The LM83 registers |
| 59 | * Manufacturer ID is 0x01 for National Semiconductor. |
| 60 | */ |
| 61 | |
| 62 | #define LM83_REG_R_MAN_ID 0xFE |
| 63 | #define LM83_REG_R_CHIP_ID 0xFF |
| 64 | #define LM83_REG_R_CONFIG 0x03 |
| 65 | #define LM83_REG_W_CONFIG 0x09 |
| 66 | #define LM83_REG_R_STATUS1 0x02 |
| 67 | #define LM83_REG_R_STATUS2 0x35 |
| 68 | #define LM83_REG_R_LOCAL_TEMP 0x00 |
| 69 | #define LM83_REG_R_LOCAL_HIGH 0x05 |
| 70 | #define LM83_REG_W_LOCAL_HIGH 0x0B |
| 71 | #define LM83_REG_R_REMOTE1_TEMP 0x30 |
| 72 | #define LM83_REG_R_REMOTE1_HIGH 0x38 |
| 73 | #define LM83_REG_W_REMOTE1_HIGH 0x50 |
| 74 | #define LM83_REG_R_REMOTE2_TEMP 0x01 |
| 75 | #define LM83_REG_R_REMOTE2_HIGH 0x07 |
| 76 | #define LM83_REG_W_REMOTE2_HIGH 0x0D |
| 77 | #define LM83_REG_R_REMOTE3_TEMP 0x31 |
| 78 | #define LM83_REG_R_REMOTE3_HIGH 0x3A |
| 79 | #define LM83_REG_W_REMOTE3_HIGH 0x52 |
| 80 | #define LM83_REG_R_TCRIT 0x42 |
| 81 | #define LM83_REG_W_TCRIT 0x5A |
| 82 | |
| 83 | /* |
| 84 | * Conversions and various macros |
Steven Cole | 44bbe87 | 2005-05-03 18:21:25 -0600 | [diff] [blame] | 85 | * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | */ |
| 87 | |
| 88 | #define TEMP_FROM_REG(val) ((val) * 1000) |
| 89 | #define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \ |
| 90 | (val) >= 127000 ? 127 : \ |
| 91 | (val) < 0 ? ((val) - 500) / 1000 : \ |
| 92 | ((val) + 500) / 1000) |
| 93 | |
| 94 | static const u8 LM83_REG_R_TEMP[] = { |
| 95 | LM83_REG_R_LOCAL_TEMP, |
| 96 | LM83_REG_R_REMOTE1_TEMP, |
| 97 | LM83_REG_R_REMOTE2_TEMP, |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 98 | LM83_REG_R_REMOTE3_TEMP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | LM83_REG_R_LOCAL_HIGH, |
| 100 | LM83_REG_R_REMOTE1_HIGH, |
| 101 | LM83_REG_R_REMOTE2_HIGH, |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 102 | LM83_REG_R_REMOTE3_HIGH, |
| 103 | LM83_REG_R_TCRIT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | static const u8 LM83_REG_W_HIGH[] = { |
| 107 | LM83_REG_W_LOCAL_HIGH, |
| 108 | LM83_REG_W_REMOTE1_HIGH, |
| 109 | LM83_REG_W_REMOTE2_HIGH, |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 110 | LM83_REG_W_REMOTE3_HIGH, |
| 111 | LM83_REG_W_TCRIT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | }; |
| 113 | |
| 114 | /* |
| 115 | * Functions declaration |
| 116 | */ |
| 117 | |
| 118 | static int lm83_attach_adapter(struct i2c_adapter *adapter); |
| 119 | static int lm83_detect(struct i2c_adapter *adapter, int address, int kind); |
| 120 | static int lm83_detach_client(struct i2c_client *client); |
| 121 | static struct lm83_data *lm83_update_device(struct device *dev); |
| 122 | |
| 123 | /* |
| 124 | * Driver data (common to all clients) |
| 125 | */ |
| 126 | |
| 127 | static struct i2c_driver lm83_driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 128 | .driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 129 | .name = "lm83", |
| 130 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | .id = I2C_DRIVERID_LM83, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | .attach_adapter = lm83_attach_adapter, |
| 133 | .detach_client = lm83_detach_client, |
| 134 | }; |
| 135 | |
| 136 | /* |
| 137 | * Client data (each client gets its own) |
| 138 | */ |
| 139 | |
| 140 | struct lm83_data { |
| 141 | struct i2c_client client; |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 142 | struct class_device *class_dev; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 143 | struct mutex update_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | char valid; /* zero until following fields are valid */ |
| 145 | unsigned long last_updated; /* in jiffies */ |
| 146 | |
| 147 | /* registers values */ |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 148 | s8 temp[9]; /* 0..3: input 1-4, |
| 149 | 4..7: high limit 1-4, |
| 150 | 8 : critical limit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | u16 alarms; /* bitvector, combined */ |
| 152 | }; |
| 153 | |
| 154 | /* |
| 155 | * Sysfs stuff |
| 156 | */ |
| 157 | |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 158 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, |
| 159 | char *buf) |
| 160 | { |
| 161 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 162 | struct lm83_data *data = lm83_update_device(dev); |
| 163 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 166 | static ssize_t set_temp(struct device *dev, struct device_attribute *devattr, |
| 167 | const char *buf, size_t count) |
| 168 | { |
| 169 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 170 | struct i2c_client *client = to_i2c_client(dev); |
| 171 | struct lm83_data *data = i2c_get_clientdata(client); |
| 172 | long val = simple_strtol(buf, NULL, 10); |
| 173 | int nr = attr->index; |
| 174 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 175 | mutex_lock(&data->update_lock); |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 176 | data->temp[nr] = TEMP_TO_REG(val); |
| 177 | i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4], |
| 178 | data->temp[nr]); |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 179 | mutex_unlock(&data->update_lock); |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 180 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 183 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
| 184 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | struct lm83_data *data = lm83_update_device(dev); |
| 187 | return sprintf(buf, "%d\n", data->alarms); |
| 188 | } |
| 189 | |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 190 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
| 191 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
| 192 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); |
| 193 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); |
| 194 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, |
| 195 | set_temp, 4); |
| 196 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, |
| 197 | set_temp, 5); |
| 198 | static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp, |
| 199 | set_temp, 6); |
| 200 | static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp, |
| 201 | set_temp, 7); |
| 202 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8); |
| 203 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8); |
| 204 | static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp, |
| 205 | set_temp, 8); |
| 206 | static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
| 208 | |
| 209 | /* |
| 210 | * Real code |
| 211 | */ |
| 212 | |
| 213 | static int lm83_attach_adapter(struct i2c_adapter *adapter) |
| 214 | { |
| 215 | if (!(adapter->class & I2C_CLASS_HWMON)) |
| 216 | return 0; |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 217 | return i2c_probe(adapter, &addr_data, lm83_detect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | /* |
| 221 | * The following function does more than just detection. If detection |
| 222 | * succeeds, it also registers the new chip. |
| 223 | */ |
| 224 | static int lm83_detect(struct i2c_adapter *adapter, int address, int kind) |
| 225 | { |
| 226 | struct i2c_client *new_client; |
| 227 | struct lm83_data *data; |
| 228 | int err = 0; |
| 229 | const char *name = ""; |
| 230 | |
| 231 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| 232 | goto exit; |
| 233 | |
Deepak Saxena | ba9c2e8 | 2005-10-17 23:08:32 +0200 | [diff] [blame] | 234 | if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | err = -ENOMEM; |
| 236 | goto exit; |
| 237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | /* The common I2C client data is placed right after the |
| 240 | * LM83-specific data. */ |
| 241 | new_client = &data->client; |
| 242 | i2c_set_clientdata(new_client, data); |
| 243 | new_client->addr = address; |
| 244 | new_client->adapter = adapter; |
| 245 | new_client->driver = &lm83_driver; |
| 246 | new_client->flags = 0; |
| 247 | |
| 248 | /* Now we do the detection and identification. A negative kind |
| 249 | * means that the driver was loaded with no force parameter |
| 250 | * (default), so we must both detect and identify the chip |
| 251 | * (actually there is only one possible kind of chip for now, LM83). |
| 252 | * A zero kind means that the driver was loaded with the force |
| 253 | * parameter, the detection step shall be skipped. A positive kind |
| 254 | * means that the driver was loaded with the force parameter and a |
| 255 | * given kind of chip is requested, so both the detection and the |
| 256 | * identification steps are skipped. */ |
| 257 | |
| 258 | /* Default to an LM83 if forced */ |
| 259 | if (kind == 0) |
| 260 | kind = lm83; |
| 261 | |
| 262 | if (kind < 0) { /* detection */ |
| 263 | if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) |
| 264 | & 0xA8) != 0x00) || |
| 265 | ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) |
| 266 | & 0x48) != 0x00) || |
| 267 | ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) |
| 268 | & 0x41) != 0x00)) { |
| 269 | dev_dbg(&adapter->dev, |
| 270 | "LM83 detection failed at 0x%02x.\n", address); |
| 271 | goto exit_free; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | if (kind <= 0) { /* identification */ |
| 276 | u8 man_id, chip_id; |
| 277 | |
| 278 | man_id = i2c_smbus_read_byte_data(new_client, |
| 279 | LM83_REG_R_MAN_ID); |
| 280 | chip_id = i2c_smbus_read_byte_data(new_client, |
| 281 | LM83_REG_R_CHIP_ID); |
| 282 | |
| 283 | if (man_id == 0x01) { /* National Semiconductor */ |
| 284 | if (chip_id == 0x03) { |
| 285 | kind = lm83; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | if (kind <= 0) { /* identification failed */ |
| 290 | dev_info(&adapter->dev, |
| 291 | "Unsupported chip (man_id=0x%02X, " |
| 292 | "chip_id=0x%02X).\n", man_id, chip_id); |
| 293 | goto exit_free; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | if (kind == lm83) { |
| 298 | name = "lm83"; |
| 299 | } |
| 300 | |
| 301 | /* We can fill in the remaining client fields */ |
| 302 | strlcpy(new_client->name, name, I2C_NAME_SIZE); |
| 303 | data->valid = 0; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 304 | mutex_init(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | /* Tell the I2C layer a new client has arrived */ |
| 307 | if ((err = i2c_attach_client(new_client))) |
| 308 | goto exit_free; |
| 309 | |
| 310 | /* |
| 311 | * Initialize the LM83 chip |
| 312 | * (Nothing to do for this one.) |
| 313 | */ |
| 314 | |
| 315 | /* Register sysfs hooks */ |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 316 | data->class_dev = hwmon_device_register(&new_client->dev); |
| 317 | if (IS_ERR(data->class_dev)) { |
| 318 | err = PTR_ERR(data->class_dev); |
| 319 | goto exit_detach; |
| 320 | } |
| 321 | |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 322 | device_create_file(&new_client->dev, |
| 323 | &sensor_dev_attr_temp1_input.dev_attr); |
| 324 | device_create_file(&new_client->dev, |
| 325 | &sensor_dev_attr_temp2_input.dev_attr); |
| 326 | device_create_file(&new_client->dev, |
| 327 | &sensor_dev_attr_temp3_input.dev_attr); |
| 328 | device_create_file(&new_client->dev, |
| 329 | &sensor_dev_attr_temp4_input.dev_attr); |
| 330 | device_create_file(&new_client->dev, |
| 331 | &sensor_dev_attr_temp1_max.dev_attr); |
| 332 | device_create_file(&new_client->dev, |
| 333 | &sensor_dev_attr_temp2_max.dev_attr); |
| 334 | device_create_file(&new_client->dev, |
| 335 | &sensor_dev_attr_temp3_max.dev_attr); |
| 336 | device_create_file(&new_client->dev, |
| 337 | &sensor_dev_attr_temp4_max.dev_attr); |
| 338 | device_create_file(&new_client->dev, |
| 339 | &sensor_dev_attr_temp1_crit.dev_attr); |
| 340 | device_create_file(&new_client->dev, |
| 341 | &sensor_dev_attr_temp2_crit.dev_attr); |
| 342 | device_create_file(&new_client->dev, |
| 343 | &sensor_dev_attr_temp3_crit.dev_attr); |
| 344 | device_create_file(&new_client->dev, |
| 345 | &sensor_dev_attr_temp4_crit.dev_attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | device_create_file(&new_client->dev, &dev_attr_alarms); |
| 347 | |
| 348 | return 0; |
| 349 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 350 | exit_detach: |
| 351 | i2c_detach_client(new_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | exit_free: |
| 353 | kfree(data); |
| 354 | exit: |
| 355 | return err; |
| 356 | } |
| 357 | |
| 358 | static int lm83_detach_client(struct i2c_client *client) |
| 359 | { |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 360 | struct lm83_data *data = i2c_get_clientdata(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | int err; |
| 362 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 363 | hwmon_device_unregister(data->class_dev); |
| 364 | |
Jean Delvare | 7bef559 | 2005-07-27 22:14:49 +0200 | [diff] [blame] | 365 | if ((err = i2c_detach_client(client))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 368 | kfree(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static struct lm83_data *lm83_update_device(struct device *dev) |
| 373 | { |
| 374 | struct i2c_client *client = to_i2c_client(dev); |
| 375 | struct lm83_data *data = i2c_get_clientdata(client); |
| 376 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 377 | mutex_lock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
| 380 | int nr; |
| 381 | |
| 382 | dev_dbg(&client->dev, "Updating lm83 data.\n"); |
Jean Delvare | 1a86c05 | 2005-06-05 21:16:39 +0200 | [diff] [blame] | 383 | for (nr = 0; nr < 9; nr++) { |
| 384 | data->temp[nr] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | i2c_smbus_read_byte_data(client, |
| 386 | LM83_REG_R_TEMP[nr]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | data->alarms = |
| 389 | i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) |
| 390 | + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) |
| 391 | << 8); |
| 392 | |
| 393 | data->last_updated = jiffies; |
| 394 | data->valid = 1; |
| 395 | } |
| 396 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 397 | mutex_unlock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | return data; |
| 400 | } |
| 401 | |
| 402 | static int __init sensors_lm83_init(void) |
| 403 | { |
| 404 | return i2c_add_driver(&lm83_driver); |
| 405 | } |
| 406 | |
| 407 | static void __exit sensors_lm83_exit(void) |
| 408 | { |
| 409 | i2c_del_driver(&lm83_driver); |
| 410 | } |
| 411 | |
| 412 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); |
| 413 | MODULE_DESCRIPTION("LM83 driver"); |
| 414 | MODULE_LICENSE("GPL"); |
| 415 | |
| 416 | module_init(sensors_lm83_init); |
| 417 | module_exit(sensors_lm83_exit); |