Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | ds1621.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | monitoring |
| 4 | Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23 |
| 5 | based on lm75.c by Frodo Looijaard <frodol@dds.nl> |
| 6 | Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with |
| 7 | the help of Jean Delvare <khali@linux-fr.org> |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/jiffies.h> |
| 28 | #include <linux/i2c.h> |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 29 | #include <linux/hwmon.h> |
| 30 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "lm75.h" |
| 32 | |
| 33 | /* Addresses to scan */ |
| 34 | static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
| 35 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* Insmod parameters */ |
Jean Delvare | f4b5026 | 2005-07-31 21:49:03 +0200 | [diff] [blame] | 38 | I2C_CLIENT_INSMOD_1(ds1621); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | static int polarity = -1; |
| 40 | module_param(polarity, int, 0); |
| 41 | MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low"); |
| 42 | |
| 43 | /* Many DS1621 constants specified below */ |
| 44 | /* Config register used for detection */ |
| 45 | /* 7 6 5 4 3 2 1 0 */ |
| 46 | /* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */ |
| 47 | #define DS1621_REG_CONFIG_NVB 0x10 |
| 48 | #define DS1621_REG_CONFIG_POLARITY 0x02 |
| 49 | #define DS1621_REG_CONFIG_1SHOT 0x01 |
| 50 | #define DS1621_REG_CONFIG_DONE 0x80 |
| 51 | |
| 52 | /* The DS1621 registers */ |
| 53 | #define DS1621_REG_TEMP 0xAA /* word, RO */ |
| 54 | #define DS1621_REG_TEMP_MIN 0xA1 /* word, RW */ |
| 55 | #define DS1621_REG_TEMP_MAX 0xA2 /* word, RW */ |
| 56 | #define DS1621_REG_CONF 0xAC /* byte, RW */ |
| 57 | #define DS1621_COM_START 0xEE /* no data */ |
| 58 | #define DS1621_COM_STOP 0x22 /* no data */ |
| 59 | |
| 60 | /* The DS1621 configuration register */ |
| 61 | #define DS1621_ALARM_TEMP_HIGH 0x40 |
| 62 | #define DS1621_ALARM_TEMP_LOW 0x20 |
| 63 | |
| 64 | /* Conversions. Rounding and limit checking is only done on the TO_REG |
| 65 | variants. Note that you should be a bit careful with which arguments |
| 66 | these macros are called: arguments may be evaluated more than once. |
| 67 | Fixing this is just not worth it. */ |
| 68 | #define ALARMS_FROM_REG(val) ((val) & \ |
| 69 | (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW)) |
| 70 | |
| 71 | /* Each client has this additional data */ |
| 72 | struct ds1621_data { |
| 73 | struct i2c_client client; |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 74 | struct class_device *class_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | struct semaphore update_lock; |
| 76 | char valid; /* !=0 if following fields are valid */ |
| 77 | unsigned long last_updated; /* In jiffies */ |
| 78 | |
| 79 | u16 temp, temp_min, temp_max; /* Register values, word */ |
| 80 | u8 conf; /* Register encoding, combined */ |
| 81 | }; |
| 82 | |
| 83 | static int ds1621_attach_adapter(struct i2c_adapter *adapter); |
| 84 | static int ds1621_detect(struct i2c_adapter *adapter, int address, |
| 85 | int kind); |
| 86 | static void ds1621_init_client(struct i2c_client *client); |
| 87 | static int ds1621_detach_client(struct i2c_client *client); |
| 88 | static struct ds1621_data *ds1621_update_client(struct device *dev); |
| 89 | |
| 90 | /* This is the driver that will be inserted */ |
| 91 | static struct i2c_driver ds1621_driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 92 | .driver = { |
Laurent Riffard | cdaf793 | 2005-11-26 20:37:41 +0100 | [diff] [blame] | 93 | .name = "ds1621", |
| 94 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | .id = I2C_DRIVERID_DS1621, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | .attach_adapter = ds1621_attach_adapter, |
| 97 | .detach_client = ds1621_detach_client, |
| 98 | }; |
| 99 | |
| 100 | /* All registers are word-sized, except for the configuration register. |
| 101 | DS1621 uses a high-byte first convention, which is exactly opposite to |
| 102 | the usual practice. */ |
| 103 | static int ds1621_read_value(struct i2c_client *client, u8 reg) |
| 104 | { |
| 105 | if (reg == DS1621_REG_CONF) |
| 106 | return i2c_smbus_read_byte_data(client, reg); |
| 107 | else |
| 108 | return swab16(i2c_smbus_read_word_data(client, reg)); |
| 109 | } |
| 110 | |
| 111 | /* All registers are word-sized, except for the configuration register. |
| 112 | DS1621 uses a high-byte first convention, which is exactly opposite to |
| 113 | the usual practice. */ |
| 114 | static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value) |
| 115 | { |
| 116 | if (reg == DS1621_REG_CONF) |
| 117 | return i2c_smbus_write_byte_data(client, reg, value); |
| 118 | else |
| 119 | return i2c_smbus_write_word_data(client, reg, swab16(value)); |
| 120 | } |
| 121 | |
| 122 | static void ds1621_init_client(struct i2c_client *client) |
| 123 | { |
| 124 | int reg = ds1621_read_value(client, DS1621_REG_CONF); |
Steven Cole | 44bbe87 | 2005-05-03 18:21:25 -0600 | [diff] [blame] | 125 | /* switch to continuous conversion mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | reg &= ~ DS1621_REG_CONFIG_1SHOT; |
| 127 | |
| 128 | /* setup output polarity */ |
| 129 | if (polarity == 0) |
| 130 | reg &= ~DS1621_REG_CONFIG_POLARITY; |
| 131 | else if (polarity == 1) |
| 132 | reg |= DS1621_REG_CONFIG_POLARITY; |
| 133 | |
| 134 | ds1621_write_value(client, DS1621_REG_CONF, reg); |
| 135 | |
| 136 | /* start conversion */ |
| 137 | i2c_smbus_write_byte(client, DS1621_COM_START); |
| 138 | } |
| 139 | |
| 140 | #define show(value) \ |
Yani Ioannou | 30f7429 | 2005-05-17 06:41:35 -0400 | [diff] [blame] | 141 | 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] | 142 | { \ |
| 143 | struct ds1621_data *data = ds1621_update_client(dev); \ |
| 144 | return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \ |
| 145 | } |
| 146 | |
| 147 | show(temp); |
| 148 | show(temp_min); |
| 149 | show(temp_max); |
| 150 | |
| 151 | #define set_temp(suffix, value, reg) \ |
Yani Ioannou | 30f7429 | 2005-05-17 06:41:35 -0400 | [diff] [blame] | 152 | static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | size_t count) \ |
| 154 | { \ |
| 155 | struct i2c_client *client = to_i2c_client(dev); \ |
| 156 | struct ds1621_data *data = ds1621_update_client(dev); \ |
| 157 | u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \ |
| 158 | \ |
| 159 | down(&data->update_lock); \ |
| 160 | data->value = val; \ |
| 161 | ds1621_write_value(client, reg, data->value); \ |
| 162 | up(&data->update_lock); \ |
| 163 | return count; \ |
| 164 | } |
| 165 | |
| 166 | set_temp(min, temp_min, DS1621_REG_TEMP_MIN); |
| 167 | set_temp(max, temp_max, DS1621_REG_TEMP_MAX); |
| 168 | |
Yani Ioannou | 30f7429 | 2005-05-17 06:41:35 -0400 | [diff] [blame] | 169 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | struct ds1621_data *data = ds1621_update_client(dev); |
| 172 | return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf)); |
| 173 | } |
| 174 | |
| 175 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
| 176 | static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL); |
| 177 | static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min); |
| 178 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max); |
| 179 | |
| 180 | |
| 181 | static int ds1621_attach_adapter(struct i2c_adapter *adapter) |
| 182 | { |
Jean Delvare | ddec748 | 2005-10-17 23:02:42 +0200 | [diff] [blame] | 183 | if (!(adapter->class & I2C_CLASS_HWMON)) |
| 184 | return 0; |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 185 | return i2c_probe(adapter, &addr_data, ds1621_detect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Jean Delvare | 2ed2dc3 | 2005-07-31 21:42:02 +0200 | [diff] [blame] | 188 | /* This function is called by i2c_probe */ |
Ben Dooks | c49efce | 2005-10-26 21:07:25 +0200 | [diff] [blame] | 189 | static int ds1621_detect(struct i2c_adapter *adapter, int address, |
| 190 | int kind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
| 192 | int conf, temp; |
| 193 | struct i2c_client *new_client; |
| 194 | struct ds1621_data *data; |
| 195 | int err = 0; |
| 196 | |
| 197 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
| 198 | | I2C_FUNC_SMBUS_WORD_DATA |
| 199 | | I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 200 | goto exit; |
| 201 | |
| 202 | /* OK. For now, we presume we have a valid client. We now create the |
| 203 | client structure, even though we cannot fill it completely yet. |
| 204 | But it allows us to access ds1621_{read,write}_value. */ |
Deepak Saxena | ba9c2e8 | 2005-10-17 23:08:32 +0200 | [diff] [blame] | 205 | if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | err = -ENOMEM; |
| 207 | goto exit; |
| 208 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
| 210 | new_client = &data->client; |
| 211 | i2c_set_clientdata(new_client, data); |
| 212 | new_client->addr = address; |
| 213 | new_client->adapter = adapter; |
| 214 | new_client->driver = &ds1621_driver; |
| 215 | new_client->flags = 0; |
| 216 | |
| 217 | |
| 218 | /* Now, we do the remaining detection. It is lousy. */ |
| 219 | if (kind < 0) { |
| 220 | /* The NVB bit should be low if no EEPROM write has been |
| 221 | requested during the latest 10ms, which is highly |
| 222 | improbable in our case. */ |
| 223 | conf = ds1621_read_value(new_client, DS1621_REG_CONF); |
| 224 | if (conf & DS1621_REG_CONFIG_NVB) |
| 225 | goto exit_free; |
| 226 | /* The 7 lowest bits of a temperature should always be 0. */ |
| 227 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP); |
| 228 | if (temp & 0x007f) |
| 229 | goto exit_free; |
| 230 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MIN); |
| 231 | if (temp & 0x007f) |
| 232 | goto exit_free; |
| 233 | temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MAX); |
| 234 | if (temp & 0x007f) |
| 235 | goto exit_free; |
| 236 | } |
| 237 | |
| 238 | /* Determine the chip type - only one kind supported! */ |
| 239 | if (kind <= 0) |
| 240 | kind = ds1621; |
| 241 | |
| 242 | /* Fill in remaining client fields and put it into the global list */ |
| 243 | strlcpy(new_client->name, "ds1621", I2C_NAME_SIZE); |
| 244 | data->valid = 0; |
| 245 | init_MUTEX(&data->update_lock); |
| 246 | |
| 247 | /* Tell the I2C layer a new client has arrived */ |
| 248 | if ((err = i2c_attach_client(new_client))) |
| 249 | goto exit_free; |
| 250 | |
| 251 | /* Initialize the DS1621 chip */ |
| 252 | ds1621_init_client(new_client); |
| 253 | |
| 254 | /* Register sysfs hooks */ |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 255 | data->class_dev = hwmon_device_register(&new_client->dev); |
| 256 | if (IS_ERR(data->class_dev)) { |
| 257 | err = PTR_ERR(data->class_dev); |
| 258 | goto exit_detach; |
| 259 | } |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | device_create_file(&new_client->dev, &dev_attr_alarms); |
| 262 | device_create_file(&new_client->dev, &dev_attr_temp1_input); |
| 263 | device_create_file(&new_client->dev, &dev_attr_temp1_min); |
| 264 | device_create_file(&new_client->dev, &dev_attr_temp1_max); |
| 265 | |
| 266 | return 0; |
| 267 | |
| 268 | /* OK, this is not exactly good programming practice, usually. But it is |
| 269 | very code-efficient in this case. */ |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 270 | exit_detach: |
| 271 | i2c_detach_client(new_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | exit_free: |
| 273 | kfree(data); |
| 274 | exit: |
| 275 | return err; |
| 276 | } |
| 277 | |
| 278 | static int ds1621_detach_client(struct i2c_client *client) |
| 279 | { |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 280 | struct ds1621_data *data = i2c_get_clientdata(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | int err; |
| 282 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 283 | hwmon_device_unregister(data->class_dev); |
| 284 | |
Jean Delvare | 7bef559 | 2005-07-27 22:14:49 +0200 | [diff] [blame] | 285 | if ((err = i2c_detach_client(client))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
Mark M. Hoffman | 943b083 | 2005-07-15 21:39:18 -0400 | [diff] [blame] | 288 | kfree(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | static struct ds1621_data *ds1621_update_client(struct device *dev) |
| 295 | { |
| 296 | struct i2c_client *client = to_i2c_client(dev); |
| 297 | struct ds1621_data *data = i2c_get_clientdata(client); |
| 298 | u8 new_conf; |
| 299 | |
| 300 | down(&data->update_lock); |
| 301 | |
| 302 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
| 303 | || !data->valid) { |
| 304 | |
| 305 | dev_dbg(&client->dev, "Starting ds1621 update\n"); |
| 306 | |
| 307 | data->conf = ds1621_read_value(client, DS1621_REG_CONF); |
| 308 | |
| 309 | data->temp = ds1621_read_value(client, DS1621_REG_TEMP); |
| 310 | |
| 311 | data->temp_min = ds1621_read_value(client, |
| 312 | DS1621_REG_TEMP_MIN); |
| 313 | data->temp_max = ds1621_read_value(client, |
| 314 | DS1621_REG_TEMP_MAX); |
| 315 | |
Steven Cole | 44bbe87 | 2005-05-03 18:21:25 -0600 | [diff] [blame] | 316 | /* reset alarms if necessary */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | new_conf = data->conf; |
| 318 | if (data->temp < data->temp_min) |
| 319 | new_conf &= ~DS1621_ALARM_TEMP_LOW; |
| 320 | if (data->temp > data->temp_max) |
| 321 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; |
| 322 | if (data->conf != new_conf) |
| 323 | ds1621_write_value(client, DS1621_REG_CONF, |
| 324 | new_conf); |
| 325 | |
| 326 | data->last_updated = jiffies; |
| 327 | data->valid = 1; |
| 328 | } |
| 329 | |
| 330 | up(&data->update_lock); |
| 331 | |
| 332 | return data; |
| 333 | } |
| 334 | |
| 335 | static int __init ds1621_init(void) |
| 336 | { |
| 337 | return i2c_add_driver(&ds1621_driver); |
| 338 | } |
| 339 | |
| 340 | static void __exit ds1621_exit(void) |
| 341 | { |
| 342 | i2c_del_driver(&ds1621_driver); |
| 343 | } |
| 344 | |
| 345 | |
| 346 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); |
| 347 | MODULE_DESCRIPTION("DS1621 driver"); |
| 348 | MODULE_LICENSE("GPL"); |
| 349 | |
| 350 | module_init(ds1621_init); |
| 351 | module_exit(ds1621_exit); |