Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | monitoring |
| 4 | Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/jiffies.h> |
| 25 | #include <linux/i2c.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 26 | #include <linux/hwmon.h> |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 27 | #include <linux/hwmon-sysfs.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 28 | #include <linux/err.h> |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 29 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "lm75.h" |
| 31 | |
| 32 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 33 | /* |
| 34 | * This driver handles the LM75 and compatible digital temperature sensors. |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 35 | * Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be |
| 36 | * listed here. We start at 9 since I2C_CLIENT_INSMOD_*() currently allow |
| 37 | * definition of up to 8 chip types (plus zero). |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 38 | */ |
| 39 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 40 | enum lm75_type { /* keep sorted in alphabetical order */ |
| 41 | ds1775 = 9, |
| 42 | ds75, |
| 43 | /* lm75 -- in I2C_CLIENT_INSMOD_1() */ |
| 44 | lm75a, |
| 45 | max6625, |
| 46 | max6626, |
| 47 | mcp980x, |
| 48 | stds75, |
| 49 | tcn75, |
| 50 | tmp100, |
| 51 | tmp101, |
| 52 | tmp175, |
| 53 | tmp275, |
| 54 | tmp75, |
| 55 | }; |
| 56 | |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 57 | /* Addresses scanned */ |
Mark M. Hoffman | 25e9c86 | 2008-02-17 22:28:03 -0500 | [diff] [blame] | 58 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 61 | /* Insmod parameters */ |
Jean Delvare | f4b5026 | 2005-07-31 21:49:03 +0200 | [diff] [blame] | 62 | I2C_CLIENT_INSMOD_1(lm75); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | /* The LM75 registers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define LM75_REG_CONF 0x01 |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 67 | static const u8 LM75_REG_TEMP[3] = { |
| 68 | 0x00, /* input */ |
| 69 | 0x03, /* max */ |
| 70 | 0x02, /* hyst */ |
| 71 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* Each client has this additional data */ |
| 74 | struct lm75_data { |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 75 | struct device *hwmon_dev; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 76 | struct mutex update_lock; |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 77 | u8 orig_conf; |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 78 | char valid; /* !=0 if registers are valid */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | unsigned long last_updated; /* In jiffies */ |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 80 | u16 temp[3]; /* Register values, |
| 81 | 0 = input |
| 82 | 1 = max |
| 83 | 2 = hyst */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | }; |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | static int lm75_read_value(struct i2c_client *client, u8 reg); |
| 87 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); |
| 88 | static struct lm75_data *lm75_update_device(struct device *dev); |
| 89 | |
| 90 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 91 | /*-----------------------------------------------------------------------*/ |
| 92 | |
| 93 | /* sysfs attributes for hwmon */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 95 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
| 96 | char *buf) |
| 97 | { |
| 98 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 99 | struct lm75_data *data = lm75_update_device(dev); |
| 100 | return sprintf(buf, "%d\n", |
| 101 | LM75_TEMP_FROM_REG(data->temp[attr->index])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 104 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
| 105 | const char *buf, size_t count) |
| 106 | { |
| 107 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 108 | struct i2c_client *client = to_i2c_client(dev); |
| 109 | struct lm75_data *data = i2c_get_clientdata(client); |
| 110 | int nr = attr->index; |
Christian Hohnstaedt | 5bfedac | 2007-08-16 11:40:10 +0200 | [diff] [blame] | 111 | long temp = simple_strtol(buf, NULL, 10); |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 112 | |
| 113 | mutex_lock(&data->update_lock); |
| 114 | data->temp[nr] = LM75_TEMP_TO_REG(temp); |
| 115 | lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]); |
| 116 | mutex_unlock(&data->update_lock); |
| 117 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 120 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
| 121 | show_temp, set_temp, 1); |
| 122 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, |
| 123 | show_temp, set_temp, 2); |
| 124 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 126 | static struct attribute *lm75_attributes[] = { |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 127 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 128 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
| 129 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 130 | |
| 131 | NULL |
| 132 | }; |
| 133 | |
| 134 | static const struct attribute_group lm75_group = { |
| 135 | .attrs = lm75_attributes, |
| 136 | }; |
| 137 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 138 | /*-----------------------------------------------------------------------*/ |
| 139 | |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 140 | /* device probe and removal */ |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 141 | |
| 142 | static int |
| 143 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 144 | { |
| 145 | struct lm75_data *data; |
| 146 | int status; |
| 147 | u8 set_mask, clr_mask; |
| 148 | int new; |
| 149 | |
| 150 | if (!i2c_check_functionality(client->adapter, |
| 151 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
| 152 | return -EIO; |
| 153 | |
| 154 | data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL); |
| 155 | if (!data) |
| 156 | return -ENOMEM; |
| 157 | |
| 158 | i2c_set_clientdata(client, data); |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 159 | mutex_init(&data->update_lock); |
| 160 | |
| 161 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. |
| 162 | * Then tweak to be more precise when appropriate. |
| 163 | */ |
| 164 | set_mask = 0; |
| 165 | clr_mask = (1 << 0) /* continuous conversions */ |
| 166 | | (1 << 6) | (1 << 5); /* 9-bit mode */ |
| 167 | |
| 168 | /* configure as specified */ |
| 169 | status = lm75_read_value(client, LM75_REG_CONF); |
| 170 | if (status < 0) { |
| 171 | dev_dbg(&client->dev, "Can't read config? %d\n", status); |
| 172 | goto exit_free; |
| 173 | } |
| 174 | data->orig_conf = status; |
| 175 | new = status & ~clr_mask; |
| 176 | new |= set_mask; |
| 177 | if (status != new) |
| 178 | lm75_write_value(client, LM75_REG_CONF, new); |
| 179 | dev_dbg(&client->dev, "Config %02x\n", new); |
| 180 | |
| 181 | /* Register sysfs hooks */ |
| 182 | status = sysfs_create_group(&client->dev.kobj, &lm75_group); |
| 183 | if (status) |
| 184 | goto exit_free; |
| 185 | |
| 186 | data->hwmon_dev = hwmon_device_register(&client->dev); |
| 187 | if (IS_ERR(data->hwmon_dev)) { |
| 188 | status = PTR_ERR(data->hwmon_dev); |
| 189 | goto exit_remove; |
| 190 | } |
| 191 | |
| 192 | dev_info(&client->dev, "%s: sensor '%s'\n", |
Kay Sievers | 739cf3a | 2009-01-06 10:44:41 -0800 | [diff] [blame^] | 193 | dev_name(data->hwmon_dev), client->name); |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 194 | |
| 195 | return 0; |
| 196 | |
| 197 | exit_remove: |
| 198 | sysfs_remove_group(&client->dev.kobj, &lm75_group); |
| 199 | exit_free: |
| 200 | i2c_set_clientdata(client, NULL); |
| 201 | kfree(data); |
| 202 | return status; |
| 203 | } |
| 204 | |
| 205 | static int lm75_remove(struct i2c_client *client) |
| 206 | { |
| 207 | struct lm75_data *data = i2c_get_clientdata(client); |
| 208 | |
| 209 | hwmon_device_unregister(data->hwmon_dev); |
| 210 | sysfs_remove_group(&client->dev.kobj, &lm75_group); |
| 211 | lm75_write_value(client, LM75_REG_CONF, data->orig_conf); |
| 212 | i2c_set_clientdata(client, NULL); |
| 213 | kfree(data); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static const struct i2c_device_id lm75_ids[] = { |
| 218 | { "ds1775", ds1775, }, |
| 219 | { "ds75", ds75, }, |
| 220 | { "lm75", lm75, }, |
| 221 | { "lm75a", lm75a, }, |
| 222 | { "max6625", max6625, }, |
| 223 | { "max6626", max6626, }, |
| 224 | { "mcp980x", mcp980x, }, |
| 225 | { "stds75", stds75, }, |
| 226 | { "tcn75", tcn75, }, |
| 227 | { "tmp100", tmp100, }, |
| 228 | { "tmp101", tmp101, }, |
| 229 | { "tmp175", tmp175, }, |
| 230 | { "tmp275", tmp275, }, |
| 231 | { "tmp75", tmp75, }, |
| 232 | { /* LIST END */ } |
| 233 | }; |
| 234 | MODULE_DEVICE_TABLE(i2c, lm75_ids); |
| 235 | |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 236 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
| 237 | static int lm75_detect(struct i2c_client *new_client, int kind, |
| 238 | struct i2c_board_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 240 | struct i2c_adapter *adapter = new_client->adapter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
| 244 | I2C_FUNC_SMBUS_WORD_DATA)) |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 245 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | /* Now, we do the remaining detection. There is no identification- |
| 248 | dedicated register so we have to rely on several tricks: |
| 249 | unused bits, registers cycling over 8-address boundaries, |
| 250 | addresses 0x04-0x07 returning the last read value. |
| 251 | The cycling+unused addresses combination is not tested, |
| 252 | since it would significantly slow the detection down and would |
| 253 | hardly add any value. */ |
| 254 | if (kind < 0) { |
| 255 | int cur, conf, hyst, os; |
| 256 | |
| 257 | /* Unused addresses */ |
| 258 | cur = i2c_smbus_read_word_data(new_client, 0); |
| 259 | conf = i2c_smbus_read_byte_data(new_client, 1); |
| 260 | hyst = i2c_smbus_read_word_data(new_client, 2); |
| 261 | if (i2c_smbus_read_word_data(new_client, 4) != hyst |
| 262 | || i2c_smbus_read_word_data(new_client, 5) != hyst |
| 263 | || i2c_smbus_read_word_data(new_client, 6) != hyst |
| 264 | || i2c_smbus_read_word_data(new_client, 7) != hyst) |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 265 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | os = i2c_smbus_read_word_data(new_client, 3); |
| 267 | if (i2c_smbus_read_word_data(new_client, 4) != os |
| 268 | || i2c_smbus_read_word_data(new_client, 5) != os |
| 269 | || i2c_smbus_read_word_data(new_client, 6) != os |
| 270 | || i2c_smbus_read_word_data(new_client, 7) != os) |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 271 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /* Unused bits */ |
| 274 | if (conf & 0xe0) |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 275 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | /* Addresses cycling */ |
| 278 | for (i = 8; i < 0xff; i += 8) |
| 279 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
| 280 | || i2c_smbus_read_word_data(new_client, i + 2) != hyst |
| 281 | || i2c_smbus_read_word_data(new_client, i + 3) != os) |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 282 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } |
| 284 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 285 | /* NOTE: we treat "force=..." and "force_lm75=..." the same. |
| 286 | * Only new-style driver binding distinguishes chip types. |
| 287 | */ |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 288 | strlcpy(info->type, "lm75", I2C_NAME_SIZE); |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 293 | static struct i2c_driver lm75_driver = { |
| 294 | .class = I2C_CLASS_HWMON, |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 295 | .driver = { |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 296 | .name = "lm75", |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 297 | }, |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 298 | .probe = lm75_probe, |
| 299 | .remove = lm75_remove, |
| 300 | .id_table = lm75_ids, |
| 301 | .detect = lm75_detect, |
| 302 | .address_data = &addr_data, |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 303 | }; |
| 304 | |
| 305 | /*-----------------------------------------------------------------------*/ |
| 306 | |
| 307 | /* register access */ |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | /* All registers are word-sized, except for the configuration register. |
| 310 | LM75 uses a high-byte first convention, which is exactly opposite to |
Jean Delvare | ccd6bef | 2008-02-19 12:42:58 +0100 | [diff] [blame] | 311 | the SMBus standard. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | static int lm75_read_value(struct i2c_client *client, u8 reg) |
| 313 | { |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 314 | int value; |
| 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (reg == LM75_REG_CONF) |
| 317 | return i2c_smbus_read_byte_data(client, reg); |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 318 | |
| 319 | value = i2c_smbus_read_word_data(client, reg); |
| 320 | return (value < 0) ? value : swab16(value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value) |
| 324 | { |
| 325 | if (reg == LM75_REG_CONF) |
| 326 | return i2c_smbus_write_byte_data(client, reg, value); |
| 327 | else |
| 328 | return i2c_smbus_write_word_data(client, reg, swab16(value)); |
| 329 | } |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | static struct lm75_data *lm75_update_device(struct device *dev) |
| 332 | { |
| 333 | struct i2c_client *client = to_i2c_client(dev); |
| 334 | struct lm75_data *data = i2c_get_clientdata(client); |
| 335 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 336 | mutex_lock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
| 339 | || !data->valid) { |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 340 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | dev_dbg(&client->dev, "Starting lm75 update\n"); |
| 342 | |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 343 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) { |
| 344 | int status; |
| 345 | |
| 346 | status = lm75_read_value(client, LM75_REG_TEMP[i]); |
| 347 | if (status < 0) |
| 348 | dev_dbg(&client->dev, "reg %d, err %d\n", |
| 349 | LM75_REG_TEMP[i], status); |
| 350 | else |
| 351 | data->temp[i] = status; |
| 352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | data->last_updated = jiffies; |
| 354 | data->valid = 1; |
| 355 | } |
| 356 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 357 | mutex_unlock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | return data; |
| 360 | } |
| 361 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 362 | /*-----------------------------------------------------------------------*/ |
| 363 | |
| 364 | /* module glue */ |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | static int __init sensors_lm75_init(void) |
| 367 | { |
Jean Delvare | 8ff69ee | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 368 | return i2c_add_driver(&lm75_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | static void __exit sensors_lm75_exit(void) |
| 372 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | i2c_del_driver(&lm75_driver); |
| 374 | } |
| 375 | |
| 376 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); |
| 377 | MODULE_DESCRIPTION("LM75 driver"); |
| 378 | MODULE_LICENSE("GPL"); |
| 379 | |
| 380 | module_init(sensors_lm75_init); |
| 381 | module_exit(sensors_lm75_exit); |