Krzysztof Helt | add77c6 | 2007-07-08 22:43:00 +0200 | [diff] [blame] | 1 | /* |
| 2 | thmc50.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | monitoring |
| 4 | Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl> |
| 5 | Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and |
| 6 | Philip Edelbrock <phil@netroedge.com> |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/i2c.h> |
| 27 | #include <linux/hwmon.h> |
| 28 | #include <linux/hwmon-sysfs.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/mutex.h> |
| 31 | |
| 32 | MODULE_LICENSE("GPL"); |
| 33 | |
| 34 | /* Addresses to scan */ |
| 35 | static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; |
| 36 | |
| 37 | /* Insmod parameters */ |
| 38 | I2C_CLIENT_INSMOD_2(thmc50, adm1022); |
| 39 | I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs " |
| 40 | "to enable 3rd temperature (ADM1022 only)"); |
| 41 | |
| 42 | /* Many THMC50 constants specified below */ |
| 43 | |
| 44 | /* The THMC50 registers */ |
| 45 | #define THMC50_REG_CONF 0x40 |
| 46 | #define THMC50_REG_COMPANY_ID 0x3E |
| 47 | #define THMC50_REG_DIE_CODE 0x3F |
| 48 | #define THMC50_REG_ANALOG_OUT 0x19 |
| 49 | |
| 50 | const static u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 }; |
| 51 | const static u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C }; |
| 52 | const static u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B }; |
| 53 | |
| 54 | #define THMC50_REG_CONF_nFANOFF 0x20 |
| 55 | |
| 56 | /* Each client has this additional data */ |
| 57 | struct thmc50_data { |
| 58 | struct i2c_client client; |
| 59 | struct class_device *class_dev; |
| 60 | |
| 61 | struct mutex update_lock; |
| 62 | enum chips type; |
| 63 | unsigned long last_updated; /* In jiffies */ |
| 64 | char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */ |
| 65 | char valid; /* !=0 if following fields are valid */ |
| 66 | |
| 67 | /* Register values */ |
| 68 | s8 temp_input[3]; |
| 69 | s8 temp_max[3]; |
| 70 | s8 temp_min[3]; |
| 71 | u8 analog_out; |
| 72 | }; |
| 73 | |
| 74 | static int thmc50_attach_adapter(struct i2c_adapter *adapter); |
| 75 | static int thmc50_detach_client(struct i2c_client *client); |
| 76 | static void thmc50_init_client(struct i2c_client *client); |
| 77 | static struct thmc50_data *thmc50_update_device(struct device *dev); |
| 78 | |
| 79 | static struct i2c_driver thmc50_driver = { |
| 80 | .driver = { |
| 81 | .name = "thmc50", |
| 82 | }, |
| 83 | .attach_adapter = thmc50_attach_adapter, |
| 84 | .detach_client = thmc50_detach_client, |
| 85 | }; |
| 86 | |
| 87 | static ssize_t show_analog_out(struct device *dev, |
| 88 | struct device_attribute *attr, char *buf) |
| 89 | { |
| 90 | struct thmc50_data *data = thmc50_update_device(dev); |
| 91 | return sprintf(buf, "%d\n", data->analog_out); |
| 92 | } |
| 93 | |
| 94 | static ssize_t set_analog_out(struct device *dev, |
| 95 | struct device_attribute *attr, |
| 96 | const char *buf, size_t count) |
| 97 | { |
| 98 | struct i2c_client *client = to_i2c_client(dev); |
| 99 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 100 | int tmp = simple_strtoul(buf, NULL, 10); |
| 101 | int config; |
| 102 | |
| 103 | mutex_lock(&data->update_lock); |
| 104 | data->analog_out = SENSORS_LIMIT(tmp, 0, 255); |
| 105 | i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, |
| 106 | data->analog_out); |
| 107 | |
| 108 | config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); |
| 109 | if (data->analog_out == 0) |
| 110 | config &= ~THMC50_REG_CONF_nFANOFF; |
| 111 | else |
| 112 | config |= THMC50_REG_CONF_nFANOFF; |
| 113 | i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); |
| 114 | |
| 115 | mutex_unlock(&data->update_lock); |
| 116 | return count; |
| 117 | } |
| 118 | |
| 119 | /* There is only one PWM mode = DC */ |
| 120 | static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr, |
| 121 | char *buf) |
| 122 | { |
| 123 | return sprintf(buf, "0\n"); |
| 124 | } |
| 125 | |
| 126 | /* Temperatures */ |
| 127 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, |
| 128 | char *buf) |
| 129 | { |
| 130 | int nr = to_sensor_dev_attr(attr)->index; |
| 131 | struct thmc50_data *data = thmc50_update_device(dev); |
| 132 | return sprintf(buf, "%d\n", data->temp_input[nr] * 1000); |
| 133 | } |
| 134 | |
| 135 | static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, |
| 136 | char *buf) |
| 137 | { |
| 138 | int nr = to_sensor_dev_attr(attr)->index; |
| 139 | struct thmc50_data *data = thmc50_update_device(dev); |
| 140 | return sprintf(buf, "%d\n", data->temp_min[nr] * 1000); |
| 141 | } |
| 142 | |
| 143 | static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, |
| 144 | const char *buf, size_t count) |
| 145 | { |
| 146 | int nr = to_sensor_dev_attr(attr)->index; |
| 147 | struct i2c_client *client = to_i2c_client(dev); |
| 148 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 149 | int val = simple_strtol(buf, NULL, 10); |
| 150 | |
| 151 | mutex_lock(&data->update_lock); |
| 152 | data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127); |
| 153 | i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr], |
| 154 | data->temp_min[nr]); |
| 155 | mutex_unlock(&data->update_lock); |
| 156 | return count; |
| 157 | } |
| 158 | |
| 159 | static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, |
| 160 | char *buf) |
| 161 | { |
| 162 | int nr = to_sensor_dev_attr(attr)->index; |
| 163 | struct thmc50_data *data = thmc50_update_device(dev); |
| 164 | return sprintf(buf, "%d\n", data->temp_max[nr] * 1000); |
| 165 | } |
| 166 | |
| 167 | static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, |
| 168 | const char *buf, size_t count) |
| 169 | { |
| 170 | int nr = to_sensor_dev_attr(attr)->index; |
| 171 | struct i2c_client *client = to_i2c_client(dev); |
| 172 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 173 | int val = simple_strtol(buf, NULL, 10); |
| 174 | |
| 175 | mutex_lock(&data->update_lock); |
| 176 | data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127); |
| 177 | i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr], |
| 178 | data->temp_max[nr]); |
| 179 | mutex_unlock(&data->update_lock); |
| 180 | return count; |
| 181 | } |
| 182 | |
| 183 | #define temp_reg(offset) \ |
| 184 | static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \ |
| 185 | NULL, offset - 1); \ |
| 186 | static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ |
| 187 | show_temp_min, set_temp_min, offset - 1); \ |
| 188 | static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ |
| 189 | show_temp_max, set_temp_max, offset - 1); |
| 190 | |
| 191 | temp_reg(1); |
| 192 | temp_reg(2); |
| 193 | temp_reg(3); |
| 194 | |
| 195 | static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out, |
| 196 | set_analog_out, 0); |
| 197 | static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0); |
| 198 | |
| 199 | static struct attribute *thmc50_attributes[] = { |
| 200 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
| 201 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
| 202 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 203 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
| 204 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
| 205 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
| 206 | &sensor_dev_attr_pwm1.dev_attr.attr, |
| 207 | &sensor_dev_attr_pwm1_mode.dev_attr.attr, |
| 208 | NULL |
| 209 | }; |
| 210 | |
| 211 | static const struct attribute_group thmc50_group = { |
| 212 | .attrs = thmc50_attributes, |
| 213 | }; |
| 214 | |
| 215 | /* for ADM1022 3rd temperature mode */ |
| 216 | static struct attribute *adm1022_attributes[] = { |
| 217 | &sensor_dev_attr_temp3_max.dev_attr.attr, |
| 218 | &sensor_dev_attr_temp3_min.dev_attr.attr, |
| 219 | &sensor_dev_attr_temp3_input.dev_attr.attr, |
| 220 | NULL |
| 221 | }; |
| 222 | |
| 223 | static const struct attribute_group adm1022_group = { |
| 224 | .attrs = adm1022_attributes, |
| 225 | }; |
| 226 | |
| 227 | static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind) |
| 228 | { |
| 229 | unsigned company; |
| 230 | unsigned revision; |
| 231 | unsigned config; |
| 232 | struct i2c_client *client; |
| 233 | struct thmc50_data *data; |
| 234 | struct device *dev; |
| 235 | int err = 0; |
| 236 | const char *type_name = ""; |
| 237 | |
| 238 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
| 239 | pr_debug("thmc50: detect failed, " |
| 240 | "smbus byte data not supported!\n"); |
| 241 | goto exit; |
| 242 | } |
| 243 | |
| 244 | /* OK. For now, we presume we have a valid client. We now create the |
| 245 | client structure, even though we cannot fill it completely yet. |
| 246 | But it allows us to access thmc50 registers. */ |
| 247 | if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) { |
| 248 | pr_debug("thmc50: detect failed, kzalloc failed!\n"); |
| 249 | err = -ENOMEM; |
| 250 | goto exit; |
| 251 | } |
| 252 | |
| 253 | client = &data->client; |
| 254 | i2c_set_clientdata(client, data); |
| 255 | client->addr = address; |
| 256 | client->adapter = adapter; |
| 257 | client->driver = &thmc50_driver; |
| 258 | dev = &client->dev; |
| 259 | |
| 260 | pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n", |
| 261 | client->addr, i2c_adapter_id(client->adapter)); |
| 262 | |
| 263 | /* Now, we do the remaining detection. */ |
| 264 | company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID); |
| 265 | revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE); |
| 266 | config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); |
| 267 | |
| 268 | if (kind == 0) |
| 269 | kind = thmc50; |
| 270 | else if (kind < 0) { |
| 271 | err = -ENODEV; |
| 272 | if (revision >= 0xc0 && ((config & 0x10) == 0)) { |
| 273 | if (company == 0x49) { |
| 274 | kind = thmc50; |
| 275 | err = 0; |
| 276 | } else if (company == 0x41) { |
| 277 | kind = adm1022; |
| 278 | err = 0; |
| 279 | } |
| 280 | } |
| 281 | } |
| 282 | if (err == -ENODEV) { |
| 283 | pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n"); |
| 284 | goto exit_free; |
| 285 | } |
| 286 | pr_debug("thmc50: Detected %s (version %x, revision %x)\n", |
| 287 | type_name, (revision >> 4) - 0xc, revision & 0xf); |
| 288 | data->type = kind; |
| 289 | |
| 290 | if (kind == thmc50) |
| 291 | type_name = "thmc50"; |
| 292 | else if (kind == adm1022) { |
| 293 | int id = i2c_adapter_id(client->adapter); |
| 294 | int i; |
| 295 | |
| 296 | type_name = "adm1022"; |
| 297 | data->has_temp3 = (config >> 7) & 1; /* config MSB */ |
| 298 | for (i = 0; i + 1 < adm1022_temp3_num; i += 2) |
| 299 | if (adm1022_temp3[i] == id && |
| 300 | adm1022_temp3[i + 1] == address) { |
| 301 | /* enable 2nd remote temp */ |
| 302 | data->has_temp3 = 1; |
| 303 | break; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /* Fill in the remaining client fields & put it into the global list */ |
| 308 | strlcpy(client->name, type_name, I2C_NAME_SIZE); |
| 309 | mutex_init(&data->update_lock); |
| 310 | |
| 311 | /* Tell the I2C layer a new client has arrived */ |
| 312 | if ((err = i2c_attach_client(client))) |
| 313 | goto exit_free; |
| 314 | |
| 315 | thmc50_init_client(client); |
| 316 | |
| 317 | /* Register sysfs hooks */ |
| 318 | if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group))) |
| 319 | goto exit_detach; |
| 320 | |
| 321 | /* Register ADM1022 sysfs hooks */ |
| 322 | if (data->type == adm1022) |
| 323 | if ((err = sysfs_create_group(&client->dev.kobj, |
| 324 | &adm1022_group))) |
| 325 | goto exit_remove_sysfs_thmc50; |
| 326 | |
| 327 | /* Register a new directory entry with module sensors */ |
| 328 | data->class_dev = hwmon_device_register(&client->dev); |
| 329 | if (IS_ERR(data->class_dev)) { |
| 330 | err = PTR_ERR(data->class_dev); |
| 331 | goto exit_remove_sysfs; |
| 332 | } |
| 333 | |
| 334 | return 0; |
| 335 | |
| 336 | exit_remove_sysfs: |
| 337 | if (data->type == adm1022) |
| 338 | sysfs_remove_group(&client->dev.kobj, &adm1022_group); |
| 339 | exit_remove_sysfs_thmc50: |
| 340 | sysfs_remove_group(&client->dev.kobj, &thmc50_group); |
| 341 | exit_detach: |
| 342 | i2c_detach_client(client); |
| 343 | exit_free: |
| 344 | kfree(data); |
| 345 | exit: |
| 346 | return err; |
| 347 | } |
| 348 | |
| 349 | static int thmc50_attach_adapter(struct i2c_adapter *adapter) |
| 350 | { |
| 351 | if (!(adapter->class & I2C_CLASS_HWMON)) |
| 352 | return 0; |
| 353 | return i2c_probe(adapter, &addr_data, thmc50_detect); |
| 354 | } |
| 355 | |
| 356 | static int thmc50_detach_client(struct i2c_client *client) |
| 357 | { |
| 358 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 359 | int err; |
| 360 | |
| 361 | hwmon_device_unregister(data->class_dev); |
| 362 | sysfs_remove_group(&client->dev.kobj, &thmc50_group); |
| 363 | if (data->type == adm1022) |
| 364 | sysfs_remove_group(&client->dev.kobj, &adm1022_group); |
| 365 | |
| 366 | if ((err = i2c_detach_client(client))) |
| 367 | return err; |
| 368 | |
| 369 | kfree(data); |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static void thmc50_init_client(struct i2c_client *client) |
| 375 | { |
| 376 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 377 | int config; |
| 378 | |
| 379 | data->analog_out = i2c_smbus_read_byte_data(client, |
| 380 | THMC50_REG_ANALOG_OUT); |
| 381 | /* set up to at least 1 */ |
| 382 | if (data->analog_out == 0) { |
| 383 | data->analog_out = 1; |
| 384 | i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, |
| 385 | data->analog_out); |
| 386 | } |
| 387 | config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); |
| 388 | config |= 0x1; /* start the chip if it is in standby mode */ |
| 389 | if (data->has_temp3) |
| 390 | config |= 0x80; /* enable 2nd remote temp */ |
| 391 | i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); |
| 392 | } |
| 393 | |
| 394 | static struct thmc50_data *thmc50_update_device(struct device *dev) |
| 395 | { |
| 396 | struct i2c_client *client = to_i2c_client(dev); |
| 397 | struct thmc50_data *data = i2c_get_clientdata(client); |
| 398 | int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0); |
| 399 | |
| 400 | mutex_lock(&data->update_lock); |
| 401 | |
| 402 | if (time_after(jiffies, data->last_updated + timeout) |
| 403 | || !data->valid) { |
| 404 | |
| 405 | int temps = data->has_temp3 ? 3 : 2; |
| 406 | int i; |
| 407 | for (i = 0; i < temps; i++) { |
| 408 | data->temp_input[i] = i2c_smbus_read_byte_data(client, |
| 409 | THMC50_REG_TEMP[i]); |
| 410 | data->temp_max[i] = i2c_smbus_read_byte_data(client, |
| 411 | THMC50_REG_TEMP_MAX[i]); |
| 412 | data->temp_min[i] = i2c_smbus_read_byte_data(client, |
| 413 | THMC50_REG_TEMP_MIN[i]); |
| 414 | } |
| 415 | data->analog_out = |
| 416 | i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); |
| 417 | data->last_updated = jiffies; |
| 418 | data->valid = 1; |
| 419 | } |
| 420 | |
| 421 | mutex_unlock(&data->update_lock); |
| 422 | |
| 423 | return data; |
| 424 | } |
| 425 | |
| 426 | static int __init sm_thmc50_init(void) |
| 427 | { |
| 428 | return i2c_add_driver(&thmc50_driver); |
| 429 | } |
| 430 | |
| 431 | static void __exit sm_thmc50_exit(void) |
| 432 | { |
| 433 | i2c_del_driver(&thmc50_driver); |
| 434 | } |
| 435 | |
| 436 | MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>"); |
| 437 | MODULE_DESCRIPTION("THMC50 driver"); |
| 438 | |
| 439 | module_init(sm_thmc50_init); |
| 440 | module_exit(sm_thmc50_exit); |