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 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 57 | /* Addresses scanned by legacy style driver binding */ |
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 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 61 | /* Insmod parameters (only for legacy style driver binding) */ |
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 | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 75 | struct i2c_client *client; |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 76 | struct device *hwmon_dev; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 77 | struct mutex update_lock; |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 78 | u8 orig_conf; |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 79 | char valid; /* !=0 if registers are valid */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | unsigned long last_updated; /* In jiffies */ |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 81 | u16 temp[3]; /* Register values, |
| 82 | 0 = input |
| 83 | 1 = max |
| 84 | 2 = hyst */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | }; |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | static int lm75_read_value(struct i2c_client *client, u8 reg); |
| 88 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); |
| 89 | static struct lm75_data *lm75_update_device(struct device *dev); |
| 90 | |
| 91 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 92 | /*-----------------------------------------------------------------------*/ |
| 93 | |
| 94 | /* sysfs attributes for hwmon */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 96 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
| 97 | char *buf) |
| 98 | { |
| 99 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 100 | struct lm75_data *data = lm75_update_device(dev); |
| 101 | return sprintf(buf, "%d\n", |
| 102 | LM75_TEMP_FROM_REG(data->temp[attr->index])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 105 | static ssize_t set_temp(struct device *dev, struct device_attribute *da, |
| 106 | const char *buf, size_t count) |
| 107 | { |
| 108 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 109 | struct i2c_client *client = to_i2c_client(dev); |
| 110 | struct lm75_data *data = i2c_get_clientdata(client); |
| 111 | int nr = attr->index; |
Christian Hohnstaedt | 5bfedac | 2007-08-16 11:40:10 +0200 | [diff] [blame] | 112 | long temp = simple_strtol(buf, NULL, 10); |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 113 | |
| 114 | mutex_lock(&data->update_lock); |
| 115 | data->temp[nr] = LM75_TEMP_TO_REG(temp); |
| 116 | lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]); |
| 117 | mutex_unlock(&data->update_lock); |
| 118 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 121 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, |
| 122 | show_temp, set_temp, 1); |
| 123 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, |
| 124 | show_temp, set_temp, 2); |
| 125 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 127 | static struct attribute *lm75_attributes[] = { |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 128 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 129 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
| 130 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 131 | |
| 132 | NULL |
| 133 | }; |
| 134 | |
| 135 | static const struct attribute_group lm75_group = { |
| 136 | .attrs = lm75_attributes, |
| 137 | }; |
| 138 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 139 | /*-----------------------------------------------------------------------*/ |
| 140 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 141 | /* "New style" I2C driver binding -- following the driver model */ |
| 142 | |
| 143 | static int |
| 144 | lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| 145 | { |
| 146 | struct lm75_data *data; |
| 147 | int status; |
| 148 | u8 set_mask, clr_mask; |
| 149 | int new; |
| 150 | |
| 151 | if (!i2c_check_functionality(client->adapter, |
| 152 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) |
| 153 | return -EIO; |
| 154 | |
| 155 | data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL); |
| 156 | if (!data) |
| 157 | return -ENOMEM; |
| 158 | |
| 159 | i2c_set_clientdata(client, data); |
| 160 | |
| 161 | data->client = client; |
| 162 | mutex_init(&data->update_lock); |
| 163 | |
| 164 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. |
| 165 | * Then tweak to be more precise when appropriate. |
| 166 | */ |
| 167 | set_mask = 0; |
| 168 | clr_mask = (1 << 0) /* continuous conversions */ |
| 169 | | (1 << 6) | (1 << 5); /* 9-bit mode */ |
| 170 | |
| 171 | /* configure as specified */ |
| 172 | status = lm75_read_value(client, LM75_REG_CONF); |
| 173 | if (status < 0) { |
| 174 | dev_dbg(&client->dev, "Can't read config? %d\n", status); |
| 175 | goto exit_free; |
| 176 | } |
| 177 | data->orig_conf = status; |
| 178 | new = status & ~clr_mask; |
| 179 | new |= set_mask; |
| 180 | if (status != new) |
| 181 | lm75_write_value(client, LM75_REG_CONF, new); |
| 182 | dev_dbg(&client->dev, "Config %02x\n", new); |
| 183 | |
| 184 | /* Register sysfs hooks */ |
| 185 | status = sysfs_create_group(&client->dev.kobj, &lm75_group); |
| 186 | if (status) |
| 187 | goto exit_free; |
| 188 | |
| 189 | data->hwmon_dev = hwmon_device_register(&client->dev); |
| 190 | if (IS_ERR(data->hwmon_dev)) { |
| 191 | status = PTR_ERR(data->hwmon_dev); |
| 192 | goto exit_remove; |
| 193 | } |
| 194 | |
| 195 | dev_info(&client->dev, "%s: sensor '%s'\n", |
| 196 | data->hwmon_dev->bus_id, client->name); |
| 197 | |
| 198 | return 0; |
| 199 | |
| 200 | exit_remove: |
| 201 | sysfs_remove_group(&client->dev.kobj, &lm75_group); |
| 202 | exit_free: |
| 203 | i2c_set_clientdata(client, NULL); |
| 204 | kfree(data); |
| 205 | return status; |
| 206 | } |
| 207 | |
| 208 | static int lm75_remove(struct i2c_client *client) |
| 209 | { |
| 210 | struct lm75_data *data = i2c_get_clientdata(client); |
| 211 | |
| 212 | hwmon_device_unregister(data->hwmon_dev); |
| 213 | sysfs_remove_group(&client->dev.kobj, &lm75_group); |
| 214 | lm75_write_value(client, LM75_REG_CONF, data->orig_conf); |
| 215 | i2c_set_clientdata(client, NULL); |
| 216 | kfree(data); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static const struct i2c_device_id lm75_ids[] = { |
| 221 | { "ds1775", ds1775, }, |
| 222 | { "ds75", ds75, }, |
| 223 | { "lm75", lm75, }, |
| 224 | { "lm75a", lm75a, }, |
| 225 | { "max6625", max6625, }, |
| 226 | { "max6626", max6626, }, |
| 227 | { "mcp980x", mcp980x, }, |
| 228 | { "stds75", stds75, }, |
| 229 | { "tcn75", tcn75, }, |
| 230 | { "tmp100", tmp100, }, |
| 231 | { "tmp101", tmp101, }, |
| 232 | { "tmp175", tmp175, }, |
| 233 | { "tmp275", tmp275, }, |
| 234 | { "tmp75", tmp75, }, |
| 235 | { /* LIST END */ } |
| 236 | }; |
| 237 | MODULE_DEVICE_TABLE(i2c, lm75_ids); |
| 238 | |
| 239 | static struct i2c_driver lm75_driver = { |
| 240 | .driver = { |
| 241 | .name = "lm75", |
| 242 | }, |
| 243 | .probe = lm75_probe, |
| 244 | .remove = lm75_remove, |
| 245 | .id_table = lm75_ids, |
| 246 | }; |
| 247 | |
| 248 | /*-----------------------------------------------------------------------*/ |
| 249 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 250 | /* "Legacy" I2C driver binding */ |
| 251 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 252 | static struct i2c_driver lm75_legacy_driver; |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 253 | |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 254 | /* This function is called by i2c_probe */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) |
| 256 | { |
| 257 | int i; |
| 258 | struct i2c_client *new_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
| 262 | I2C_FUNC_SMBUS_WORD_DATA)) |
| 263 | goto exit; |
| 264 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 265 | /* OK. For now, we presume we have a valid address. We create the |
| 266 | client structure, even though there may be no sensor present. |
| 267 | But it allows us to use i2c_smbus_read_*_data() calls. */ |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 268 | new_client = kzalloc(sizeof *new_client, GFP_KERNEL); |
| 269 | if (!new_client) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | err = -ENOMEM; |
| 271 | goto exit; |
| 272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | new_client->addr = address; |
| 275 | new_client->adapter = adapter; |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 276 | new_client->driver = &lm75_legacy_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | new_client->flags = 0; |
| 278 | |
| 279 | /* Now, we do the remaining detection. There is no identification- |
| 280 | dedicated register so we have to rely on several tricks: |
| 281 | unused bits, registers cycling over 8-address boundaries, |
| 282 | addresses 0x04-0x07 returning the last read value. |
| 283 | The cycling+unused addresses combination is not tested, |
| 284 | since it would significantly slow the detection down and would |
| 285 | hardly add any value. */ |
| 286 | if (kind < 0) { |
| 287 | int cur, conf, hyst, os; |
| 288 | |
| 289 | /* Unused addresses */ |
| 290 | cur = i2c_smbus_read_word_data(new_client, 0); |
| 291 | conf = i2c_smbus_read_byte_data(new_client, 1); |
| 292 | hyst = i2c_smbus_read_word_data(new_client, 2); |
| 293 | if (i2c_smbus_read_word_data(new_client, 4) != hyst |
| 294 | || i2c_smbus_read_word_data(new_client, 5) != hyst |
| 295 | || i2c_smbus_read_word_data(new_client, 6) != hyst |
| 296 | || i2c_smbus_read_word_data(new_client, 7) != hyst) |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 297 | goto exit_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | os = i2c_smbus_read_word_data(new_client, 3); |
| 299 | if (i2c_smbus_read_word_data(new_client, 4) != os |
| 300 | || i2c_smbus_read_word_data(new_client, 5) != os |
| 301 | || i2c_smbus_read_word_data(new_client, 6) != os |
| 302 | || i2c_smbus_read_word_data(new_client, 7) != os) |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 303 | goto exit_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | /* Unused bits */ |
| 306 | if (conf & 0xe0) |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 307 | goto exit_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | /* Addresses cycling */ |
| 310 | for (i = 8; i < 0xff; i += 8) |
| 311 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
| 312 | || i2c_smbus_read_word_data(new_client, i + 2) != hyst |
| 313 | || i2c_smbus_read_word_data(new_client, i + 3) != os) |
| 314 | goto exit_free; |
| 315 | } |
| 316 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 317 | /* NOTE: we treat "force=..." and "force_lm75=..." the same. |
| 318 | * Only new-style driver binding distinguishes chip types. |
| 319 | */ |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 320 | strlcpy(new_client->name, "lm75", I2C_NAME_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* Tell the I2C layer a new client has arrived */ |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 323 | err = i2c_attach_client(new_client); |
| 324 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | goto exit_free; |
| 326 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 327 | err = lm75_probe(new_client, NULL); |
| 328 | if (err < 0) |
Mark M. Hoffman | c1685f6 | 2006-09-24 20:59:49 +0200 | [diff] [blame] | 329 | goto exit_detach; |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | return 0; |
| 332 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 333 | exit_detach: |
| 334 | i2c_detach_client(new_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | exit_free: |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 336 | kfree(new_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | exit: |
| 338 | return err; |
| 339 | } |
| 340 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 341 | static int lm75_attach_adapter(struct i2c_adapter *adapter) |
| 342 | { |
| 343 | if (!(adapter->class & I2C_CLASS_HWMON)) |
| 344 | return 0; |
| 345 | return i2c_probe(adapter, &addr_data, lm75_detect); |
| 346 | } |
| 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | static int lm75_detach_client(struct i2c_client *client) |
| 349 | { |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 350 | lm75_remove(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | i2c_detach_client(client); |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 352 | kfree(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 356 | static struct i2c_driver lm75_legacy_driver = { |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 357 | .driver = { |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 358 | .name = "lm75_legacy", |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 359 | }, |
| 360 | .attach_adapter = lm75_attach_adapter, |
| 361 | .detach_client = lm75_detach_client, |
| 362 | }; |
| 363 | |
| 364 | /*-----------------------------------------------------------------------*/ |
| 365 | |
| 366 | /* register access */ |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /* All registers are word-sized, except for the configuration register. |
| 369 | LM75 uses a high-byte first convention, which is exactly opposite to |
Jean Delvare | ccd6bef | 2008-02-19 12:42:58 +0100 | [diff] [blame] | 370 | the SMBus standard. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | static int lm75_read_value(struct i2c_client *client, u8 reg) |
| 372 | { |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 373 | int value; |
| 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | if (reg == LM75_REG_CONF) |
| 376 | return i2c_smbus_read_byte_data(client, reg); |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 377 | |
| 378 | value = i2c_smbus_read_word_data(client, reg); |
| 379 | return (value < 0) ? value : swab16(value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value) |
| 383 | { |
| 384 | if (reg == LM75_REG_CONF) |
| 385 | return i2c_smbus_write_byte_data(client, reg, value); |
| 386 | else |
| 387 | return i2c_smbus_write_word_data(client, reg, swab16(value)); |
| 388 | } |
| 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | static struct lm75_data *lm75_update_device(struct device *dev) |
| 391 | { |
| 392 | struct i2c_client *client = to_i2c_client(dev); |
| 393 | struct lm75_data *data = i2c_get_clientdata(client); |
| 394 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 395 | mutex_lock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
| 398 | || !data->valid) { |
Jean Delvare | 9ca8e40c8 | 2007-05-08 17:22:01 +0200 | [diff] [blame] | 399 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | dev_dbg(&client->dev, "Starting lm75 update\n"); |
| 401 | |
David Brownell | bcccc3a | 2008-05-03 19:19:16 -0700 | [diff] [blame] | 402 | for (i = 0; i < ARRAY_SIZE(data->temp); i++) { |
| 403 | int status; |
| 404 | |
| 405 | status = lm75_read_value(client, LM75_REG_TEMP[i]); |
| 406 | if (status < 0) |
| 407 | dev_dbg(&client->dev, "reg %d, err %d\n", |
| 408 | LM75_REG_TEMP[i], status); |
| 409 | else |
| 410 | data->temp[i] = status; |
| 411 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | data->last_updated = jiffies; |
| 413 | data->valid = 1; |
| 414 | } |
| 415 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 416 | mutex_unlock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | return data; |
| 419 | } |
| 420 | |
David Brownell | 01a5239 | 2008-04-21 12:10:53 -0700 | [diff] [blame] | 421 | /*-----------------------------------------------------------------------*/ |
| 422 | |
| 423 | /* module glue */ |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | static int __init sensors_lm75_init(void) |
| 426 | { |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 427 | int status; |
| 428 | |
| 429 | status = i2c_add_driver(&lm75_driver); |
| 430 | if (status < 0) |
| 431 | return status; |
| 432 | |
| 433 | status = i2c_add_driver(&lm75_legacy_driver); |
| 434 | if (status < 0) |
| 435 | i2c_del_driver(&lm75_driver); |
| 436 | |
| 437 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | static void __exit sensors_lm75_exit(void) |
| 441 | { |
David Brownell | 9ebd3d8 | 2008-05-03 19:33:15 -0700 | [diff] [blame] | 442 | i2c_del_driver(&lm75_legacy_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | i2c_del_driver(&lm75_driver); |
| 444 | } |
| 445 | |
| 446 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); |
| 447 | MODULE_DESCRIPTION("LM75 driver"); |
| 448 | MODULE_LICENSE("GPL"); |
| 449 | |
| 450 | module_init(sensors_lm75_init); |
| 451 | module_exit(sensors_lm75_exit); |