Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * lm92 - Hardware monitoring driver |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 3 | * Copyright (C) 2005-2008 Jean Delvare <khali@linux-fr.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Based on the lm90 driver, with some ideas taken from the lm_sensors |
| 6 | * lm92 driver as well. |
| 7 | * |
| 8 | * The LM92 is a sensor chip made by National Semiconductor. It reports |
| 9 | * its own temperature with a 0.0625 deg resolution and a 0.33 deg |
| 10 | * accuracy. Complete datasheet can be obtained from National's website |
| 11 | * at: |
| 12 | * http://www.national.com/pf/LM/LM92.html |
| 13 | * |
| 14 | * This driver also supports the MAX6635 sensor chip made by Maxim. |
| 15 | * This chip is compatible with the LM92, but has a lesser accuracy |
| 16 | * (1.0 deg). Complete datasheet can be obtained from Maxim's website |
| 17 | * at: |
| 18 | * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074 |
| 19 | * |
| 20 | * Since the LM92 was the first chipset supported by this driver, most |
| 21 | * comments will refer to this chipset, but are actually general and |
| 22 | * concern all supported chipsets, unless mentioned otherwise. |
| 23 | * |
| 24 | * Support could easily be added for the National Semiconductor LM76 |
| 25 | * and Maxim MAX6633 and MAX6634 chips, which are mostly compatible |
| 26 | * with the LM92. |
| 27 | * |
| 28 | * This program is free software; you can redistribute it and/or modify |
| 29 | * it under the terms of the GNU General Public License as published by |
| 30 | * the Free Software Foundation; either version 2 of the License, or |
| 31 | * (at your option) any later version. |
| 32 | * |
| 33 | * This program is distributed in the hope that it will be useful, |
| 34 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 35 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 36 | * GNU General Public License for more details. |
| 37 | * |
| 38 | * You should have received a copy of the GNU General Public License |
| 39 | * along with this program; if not, write to the Free Software |
| 40 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 41 | */ |
| 42 | |
| 43 | #include <linux/module.h> |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/slab.h> |
| 46 | #include <linux/i2c.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 47 | #include <linux/hwmon.h> |
Jean Delvare | 6cb59e9 | 2008-01-06 15:25:52 +0100 | [diff] [blame] | 48 | #include <linux/hwmon-sysfs.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 49 | #include <linux/err.h> |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 50 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 52 | /* |
| 53 | * The LM92 and MAX6635 have 2 two-state pins for address selection, |
| 54 | * resulting in 4 possible addresses. |
| 55 | */ |
Mark M. Hoffman | 25e9c86 | 2008-02-17 22:28:03 -0500 | [diff] [blame] | 56 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, |
| 57 | I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* The LM92 registers */ |
| 60 | #define LM92_REG_CONFIG 0x01 /* 8-bit, RW */ |
| 61 | #define LM92_REG_TEMP 0x00 /* 16-bit, RO */ |
| 62 | #define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */ |
| 63 | #define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */ |
| 64 | #define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */ |
| 65 | #define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */ |
| 66 | #define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */ |
| 67 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 68 | /* |
| 69 | * The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius, |
| 70 | * left-justified in 16-bit registers. No rounding is done, with such |
| 71 | * a resolution it's just not worth it. Note that the MAX6635 doesn't |
| 72 | * make use of the 4 lower bits for limits (i.e. effective resolution |
| 73 | * for limits is 1 degree Celsius). |
| 74 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | static inline int TEMP_FROM_REG(s16 reg) |
| 76 | { |
| 77 | return reg / 8 * 625 / 10; |
| 78 | } |
| 79 | |
| 80 | static inline s16 TEMP_TO_REG(int val) |
| 81 | { |
| 82 | if (val <= -60000) |
| 83 | return -60000 * 10 / 625 * 8; |
| 84 | if (val >= 160000) |
| 85 | return 160000 * 10 / 625 * 8; |
| 86 | return val * 10 / 625 * 8; |
| 87 | } |
| 88 | |
| 89 | /* Alarm flags are stored in the 3 LSB of the temperature register */ |
| 90 | static inline u8 ALARMS_FROM_REG(s16 reg) |
| 91 | { |
| 92 | return reg & 0x0007; |
| 93 | } |
| 94 | |
| 95 | /* Driver data (common to all clients) */ |
| 96 | static struct i2c_driver lm92_driver; |
| 97 | |
| 98 | /* Client data (each client gets its own) */ |
| 99 | struct lm92_data { |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 100 | struct device *hwmon_dev; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 101 | struct mutex update_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | char valid; /* zero until following fields are valid */ |
| 103 | unsigned long last_updated; /* in jiffies */ |
| 104 | |
| 105 | /* registers values */ |
| 106 | s16 temp1_input, temp1_crit, temp1_min, temp1_max, temp1_hyst; |
| 107 | }; |
| 108 | |
| 109 | |
| 110 | /* |
| 111 | * Sysfs attributes and callback functions |
| 112 | */ |
| 113 | |
| 114 | static struct lm92_data *lm92_update_device(struct device *dev) |
| 115 | { |
| 116 | struct i2c_client *client = to_i2c_client(dev); |
| 117 | struct lm92_data *data = i2c_get_clientdata(client); |
| 118 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 119 | mutex_lock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | if (time_after(jiffies, data->last_updated + HZ) |
| 122 | || !data->valid) { |
| 123 | dev_dbg(&client->dev, "Updating lm92 data\n"); |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 124 | data->temp1_input = i2c_smbus_read_word_swapped(client, |
| 125 | LM92_REG_TEMP); |
| 126 | data->temp1_hyst = i2c_smbus_read_word_swapped(client, |
| 127 | LM92_REG_TEMP_HYST); |
| 128 | data->temp1_crit = i2c_smbus_read_word_swapped(client, |
| 129 | LM92_REG_TEMP_CRIT); |
| 130 | data->temp1_min = i2c_smbus_read_word_swapped(client, |
| 131 | LM92_REG_TEMP_LOW); |
| 132 | data->temp1_max = i2c_smbus_read_word_swapped(client, |
| 133 | LM92_REG_TEMP_HIGH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | data->last_updated = jiffies; |
| 136 | data->valid = 1; |
| 137 | } |
| 138 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 139 | mutex_unlock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | return data; |
| 142 | } |
| 143 | |
| 144 | #define show_temp(value) \ |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 145 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, \ |
| 146 | char *buf) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { \ |
| 148 | struct lm92_data *data = lm92_update_device(dev); \ |
| 149 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ |
| 150 | } |
| 151 | show_temp(temp1_input); |
| 152 | show_temp(temp1_crit); |
| 153 | show_temp(temp1_min); |
| 154 | show_temp(temp1_max); |
| 155 | |
| 156 | #define set_temp(value, reg) \ |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 157 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, \ |
| 158 | const char *buf, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | size_t count) \ |
| 160 | { \ |
| 161 | struct i2c_client *client = to_i2c_client(dev); \ |
| 162 | struct lm92_data *data = i2c_get_clientdata(client); \ |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 163 | long val; \ |
| 164 | int err = kstrtol(buf, 10, &val); \ |
| 165 | if (err) \ |
| 166 | return err; \ |
| 167 | \ |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 168 | mutex_lock(&data->update_lock); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | data->value = TEMP_TO_REG(val); \ |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 170 | i2c_smbus_write_word_swapped(client, reg, data->value); \ |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 171 | mutex_unlock(&data->update_lock); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | return count; \ |
| 173 | } |
| 174 | set_temp(temp1_crit, LM92_REG_TEMP_CRIT); |
| 175 | set_temp(temp1_min, LM92_REG_TEMP_LOW); |
| 176 | set_temp(temp1_max, LM92_REG_TEMP_HIGH); |
| 177 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 178 | static ssize_t show_temp1_crit_hyst(struct device *dev, |
| 179 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
| 181 | struct lm92_data *data = lm92_update_device(dev); |
| 182 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_crit) |
| 183 | - TEMP_FROM_REG(data->temp1_hyst)); |
| 184 | } |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 185 | static ssize_t show_temp1_max_hyst(struct device *dev, |
| 186 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
| 188 | struct lm92_data *data = lm92_update_device(dev); |
| 189 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_max) |
| 190 | - TEMP_FROM_REG(data->temp1_hyst)); |
| 191 | } |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 192 | static ssize_t show_temp1_min_hyst(struct device *dev, |
| 193 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
| 195 | struct lm92_data *data = lm92_update_device(dev); |
| 196 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_min) |
| 197 | + TEMP_FROM_REG(data->temp1_hyst)); |
| 198 | } |
| 199 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 200 | static ssize_t set_temp1_crit_hyst(struct device *dev, |
| 201 | struct device_attribute *attr, |
| 202 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
| 204 | struct i2c_client *client = to_i2c_client(dev); |
| 205 | struct lm92_data *data = i2c_get_clientdata(client); |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 206 | long val; |
| 207 | int err; |
| 208 | |
| 209 | err = kstrtol(buf, 10, &val); |
| 210 | if (err) |
| 211 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 213 | mutex_lock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | data->temp1_hyst = TEMP_FROM_REG(data->temp1_crit) - val; |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 215 | i2c_smbus_write_word_swapped(client, LM92_REG_TEMP_HYST, |
| 216 | TEMP_TO_REG(data->temp1_hyst)); |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 217 | mutex_unlock(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return count; |
| 219 | } |
| 220 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 221 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, |
| 222 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
| 224 | struct lm92_data *data = lm92_update_device(dev); |
| 225 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp1_input)); |
| 226 | } |
| 227 | |
Jean Delvare | 6cb59e9 | 2008-01-06 15:25:52 +0100 | [diff] [blame] | 228 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
| 229 | char *buf) |
| 230 | { |
| 231 | int bitnr = to_sensor_dev_attr(attr)->index; |
| 232 | struct lm92_data *data = lm92_update_device(dev); |
| 233 | return sprintf(buf, "%d\n", (data->temp1_input >> bitnr) & 1); |
| 234 | } |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1_input, NULL); |
| 237 | static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp1_crit, |
| 238 | set_temp1_crit); |
| 239 | static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp1_crit_hyst, |
| 240 | set_temp1_crit_hyst); |
| 241 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp1_min, |
| 242 | set_temp1_min); |
| 243 | static DEVICE_ATTR(temp1_min_hyst, S_IRUGO, show_temp1_min_hyst, NULL); |
| 244 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp1_max, |
| 245 | set_temp1_max); |
| 246 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_temp1_max_hyst, NULL); |
| 247 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
Jean Delvare | 6cb59e9 | 2008-01-06 15:25:52 +0100 | [diff] [blame] | 248 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 2); |
| 249 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0); |
| 250 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | |
| 253 | /* |
| 254 | * Detection and registration |
| 255 | */ |
| 256 | |
| 257 | static void lm92_init_client(struct i2c_client *client) |
| 258 | { |
| 259 | u8 config; |
| 260 | |
| 261 | /* Start the conversions if needed */ |
| 262 | config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG); |
| 263 | if (config & 0x01) |
| 264 | i2c_smbus_write_byte_data(client, LM92_REG_CONFIG, |
| 265 | config & 0xFE); |
| 266 | } |
| 267 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 268 | /* |
| 269 | * The MAX6635 has no identification register, so we have to use tricks |
| 270 | * to identify it reliably. This is somewhat slow. |
| 271 | * Note that we do NOT rely on the 2 MSB of the configuration register |
| 272 | * always reading 0, as suggested by the datasheet, because it was once |
| 273 | * reported not to be true. |
| 274 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | static int max6635_check(struct i2c_client *client) |
| 276 | { |
| 277 | u16 temp_low, temp_high, temp_hyst, temp_crit; |
| 278 | u8 conf; |
| 279 | int i; |
| 280 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 281 | /* |
| 282 | * No manufacturer ID register, so a read from this address will |
| 283 | * always return the last read value. |
| 284 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | temp_low = i2c_smbus_read_word_data(client, LM92_REG_TEMP_LOW); |
| 286 | if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_low) |
| 287 | return 0; |
| 288 | temp_high = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HIGH); |
| 289 | if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_high) |
| 290 | return 0; |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* Limits are stored as integer values (signed, 9-bit). */ |
| 293 | if ((temp_low & 0x7f00) || (temp_high & 0x7f00)) |
| 294 | return 0; |
| 295 | temp_hyst = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HYST); |
| 296 | temp_crit = i2c_smbus_read_word_data(client, LM92_REG_TEMP_CRIT); |
| 297 | if ((temp_hyst & 0x7f00) || (temp_crit & 0x7f00)) |
| 298 | return 0; |
| 299 | |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 300 | /* |
| 301 | * Registers addresses were found to cycle over 16-byte boundaries. |
| 302 | * We don't test all registers with all offsets so as to save some |
| 303 | * reads and time, but this should still be sufficient to dismiss |
| 304 | * non-MAX6635 chips. |
| 305 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | conf = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG); |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 307 | for (i = 16; i < 96; i *= 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if (temp_hyst != i2c_smbus_read_word_data(client, |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 309 | LM92_REG_TEMP_HYST + i - 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | || temp_crit != i2c_smbus_read_word_data(client, |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 311 | LM92_REG_TEMP_CRIT + i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | || temp_low != i2c_smbus_read_word_data(client, |
| 313 | LM92_REG_TEMP_LOW + i + 16) |
| 314 | || temp_high != i2c_smbus_read_word_data(client, |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 315 | LM92_REG_TEMP_HIGH + i + 32) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | || conf != i2c_smbus_read_byte_data(client, |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 317 | LM92_REG_CONFIG + i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | return 1; |
| 322 | } |
| 323 | |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 324 | static struct attribute *lm92_attributes[] = { |
| 325 | &dev_attr_temp1_input.attr, |
| 326 | &dev_attr_temp1_crit.attr, |
| 327 | &dev_attr_temp1_crit_hyst.attr, |
| 328 | &dev_attr_temp1_min.attr, |
| 329 | &dev_attr_temp1_min_hyst.attr, |
| 330 | &dev_attr_temp1_max.attr, |
| 331 | &dev_attr_temp1_max_hyst.attr, |
| 332 | &dev_attr_alarms.attr, |
Jean Delvare | 6cb59e9 | 2008-01-06 15:25:52 +0100 | [diff] [blame] | 333 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
| 334 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
| 335 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 336 | NULL |
| 337 | }; |
| 338 | |
| 339 | static const struct attribute_group lm92_group = { |
| 340 | .attrs = lm92_attributes, |
| 341 | }; |
| 342 | |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 343 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
Jean Delvare | 310ec79 | 2009-12-14 21:17:23 +0100 | [diff] [blame] | 344 | static int lm92_detect(struct i2c_client *new_client, |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 345 | struct i2c_board_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 347 | struct i2c_adapter *adapter = new_client->adapter; |
Jean Delvare | 52df644 | 2009-12-09 20:35:57 +0100 | [diff] [blame] | 348 | u8 config; |
| 349 | u16 man_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
| 352 | | I2C_FUNC_SMBUS_WORD_DATA)) |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 353 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Jean Delvare | 52df644 | 2009-12-09 20:35:57 +0100 | [diff] [blame] | 355 | config = i2c_smbus_read_byte_data(new_client, LM92_REG_CONFIG); |
| 356 | man_id = i2c_smbus_read_word_data(new_client, LM92_REG_MAN_ID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Jean Delvare | 52df644 | 2009-12-09 20:35:57 +0100 | [diff] [blame] | 358 | if ((config & 0xe0) == 0x00 && man_id == 0x0180) |
| 359 | pr_info("lm92: Found National Semiconductor LM92 chip\n"); |
| 360 | else if (max6635_check(new_client)) |
| 361 | pr_info("lm92: Found Maxim MAX6635 chip\n"); |
| 362 | else |
| 363 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 365 | strlcpy(info->type, "lm92", I2C_NAME_SIZE); |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | static int lm92_probe(struct i2c_client *new_client, |
| 371 | const struct i2c_device_id *id) |
| 372 | { |
| 373 | struct lm92_data *data; |
| 374 | int err; |
| 375 | |
Guenter Roeck | 705375c | 2012-06-02 09:58:11 -0700 | [diff] [blame] | 376 | data = devm_kzalloc(&new_client->dev, sizeof(struct lm92_data), |
| 377 | GFP_KERNEL); |
| 378 | if (!data) |
| 379 | return -ENOMEM; |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 380 | |
| 381 | i2c_set_clientdata(new_client, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | data->valid = 0; |
Ingo Molnar | 9a61bf6 | 2006-01-18 23:19:26 +0100 | [diff] [blame] | 383 | mutex_init(&data->update_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | /* Initialize the chipset */ |
| 386 | lm92_init_client(new_client); |
| 387 | |
| 388 | /* Register sysfs hooks */ |
Guenter Roeck | a318afd | 2012-01-14 21:04:18 -0800 | [diff] [blame] | 389 | err = sysfs_create_group(&new_client->dev.kobj, &lm92_group); |
| 390 | if (err) |
Guenter Roeck | 705375c | 2012-06-02 09:58:11 -0700 | [diff] [blame] | 391 | return err; |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 392 | |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 393 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
| 394 | if (IS_ERR(data->hwmon_dev)) { |
| 395 | err = PTR_ERR(data->hwmon_dev); |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 396 | goto exit_remove; |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 397 | } |
| 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return 0; |
| 400 | |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 401 | exit_remove: |
| 402 | sysfs_remove_group(&new_client->dev.kobj, &lm92_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return err; |
| 404 | } |
| 405 | |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 406 | static int lm92_remove(struct i2c_client *client) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 408 | struct lm92_data *data = i2c_get_clientdata(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 410 | hwmon_device_unregister(data->hwmon_dev); |
Mark M. Hoffman | 0501a38 | 2006-09-24 21:14:35 +0200 | [diff] [blame] | 411 | sysfs_remove_group(&client->dev.kobj, &lm92_group); |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | |
| 417 | /* |
| 418 | * Module and driver stuff |
| 419 | */ |
| 420 | |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 421 | static const struct i2c_device_id lm92_id[] = { |
Jean Delvare | 1f86df4 | 2009-12-14 21:17:26 +0100 | [diff] [blame] | 422 | { "lm92", 0 }, |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 423 | /* max6635 could be added here */ |
| 424 | { } |
| 425 | }; |
| 426 | MODULE_DEVICE_TABLE(i2c, lm92_id); |
| 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | static struct i2c_driver lm92_driver = { |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 429 | .class = I2C_CLASS_HWMON, |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 430 | .driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 431 | .name = "lm92", |
| 432 | }, |
Jean Delvare | 910e8dc | 2008-07-16 19:30:15 +0200 | [diff] [blame] | 433 | .probe = lm92_probe, |
| 434 | .remove = lm92_remove, |
| 435 | .id_table = lm92_id, |
| 436 | .detect = lm92_detect, |
Jean Delvare | c3813d6 | 2009-12-14 21:17:25 +0100 | [diff] [blame] | 437 | .address_list = normal_i2c, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | }; |
| 439 | |
Axel Lin | f0967ee | 2012-01-20 15:38:18 +0800 | [diff] [blame] | 440 | module_i2c_driver(lm92_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); |
| 443 | MODULE_DESCRIPTION("LM92/MAX6635 driver"); |
| 444 | MODULE_LICENSE("GPL"); |