Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Creation Date: <2003/03/14 20:54:13 samuel> |
| 3 | * Time-stamp: <2004/03/20 14:20:59 samuel> |
| 4 | * |
| 5 | * <therm_windtunnel.c> |
| 6 | * |
| 7 | * The G4 "windtunnel" has a single fan controlled by an |
| 8 | * ADM1030 fan controller and a DS1775 thermostat. |
| 9 | * |
| 10 | * The fan controller is equipped with a temperature sensor |
| 11 | * which measures the case temperature. The DS1775 sensor |
| 12 | * measures the CPU temperature. This driver tunes the |
| 13 | * behavior of the fan. It is based upon empirical observations |
| 14 | * of the 'AppleFan' driver under Mac OS X. |
| 15 | * |
| 16 | * WARNING: This driver has only been testen on Apple's |
| 17 | * 1.25 MHz Dual G4 (March 03). It is tuned for a CPU |
| 18 | * temperatur around 57 C. |
| 19 | * |
| 20 | * Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se) |
| 21 | * |
| 22 | * Loosely based upon 'thermostat.c' written by Benjamin Herrenschmidt |
| 23 | * |
| 24 | * This program is free software; you can redistribute it and/or |
| 25 | * modify it under the terms of the GNU General Public License |
| 26 | * as published by the Free Software Foundation |
| 27 | * |
| 28 | */ |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/types.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/delay.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <linux/i2c.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/init.h> |
Benjamin Herrenschmidt | 7eebde7 | 2006-11-11 17:24:59 +1100 | [diff] [blame] | 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/prom.h> |
| 41 | #include <asm/machdep.h> |
| 42 | #include <asm/io.h> |
| 43 | #include <asm/system.h> |
| 44 | #include <asm/sections.h> |
Benjamin Herrenschmidt | 7eebde7 | 2006-11-11 17:24:59 +1100 | [diff] [blame] | 45 | #include <asm/of_platform.h> |
Jeff Mahoney | 5e65577 | 2005-07-06 15:44:41 -0400 | [diff] [blame] | 46 | #include <asm/macio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define LOG_TEMP 0 /* continously log temperature */ |
| 49 | |
| 50 | #define I2C_DRIVERID_G4FAN 0x9001 /* fixme */ |
| 51 | |
| 52 | static int do_probe( struct i2c_adapter *adapter, int addr, int kind); |
| 53 | |
| 54 | /* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */ |
Jean Delvare | b3d5496 | 2005-04-02 20:31:02 +0200 | [diff] [blame] | 55 | static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, |
| 56 | 0x4c, 0x4d, 0x4e, 0x4f, |
| 57 | 0x2c, 0x2d, 0x2e, 0x2f, |
| 58 | I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | I2C_CLIENT_INSMOD; |
| 61 | |
| 62 | static struct { |
| 63 | volatile int running; |
| 64 | struct completion completion; |
| 65 | pid_t poll_task; |
| 66 | |
| 67 | struct semaphore lock; |
| 68 | struct of_device *of_dev; |
| 69 | |
| 70 | struct i2c_client *thermostat; |
| 71 | struct i2c_client *fan; |
| 72 | |
| 73 | int overheat_temp; /* 100% fan at this temp */ |
| 74 | int overheat_hyst; |
| 75 | int temp; |
| 76 | int casetemp; |
| 77 | int fan_level; /* active fan_table setting */ |
| 78 | |
| 79 | int downind; |
| 80 | int upind; |
| 81 | |
| 82 | int r0, r1, r20, r23, r25; /* saved register */ |
| 83 | } x; |
| 84 | |
| 85 | #define T(x,y) (((x)<<8) | (y)*0x100/10 ) |
| 86 | |
| 87 | static struct { |
| 88 | int fan_down_setting; |
| 89 | int temp; |
| 90 | int fan_up_setting; |
| 91 | } fan_table[] = { |
| 92 | { 11, T(0,0), 11 }, /* min fan */ |
| 93 | { 11, T(55,0), 11 }, |
| 94 | { 6, T(55,3), 11 }, |
| 95 | { 7, T(56,0), 11 }, |
| 96 | { 8, T(57,0), 8 }, |
| 97 | { 7, T(58,3), 7 }, |
| 98 | { 6, T(58,8), 6 }, |
| 99 | { 5, T(59,2), 5 }, |
| 100 | { 4, T(59,6), 4 }, |
| 101 | { 3, T(59,9), 3 }, |
| 102 | { 2, T(60,1), 2 }, |
| 103 | { 1, 0xfffff, 1 } /* on fire */ |
| 104 | }; |
| 105 | |
| 106 | static void |
| 107 | print_temp( const char *s, int temp ) |
| 108 | { |
| 109 | printk("%s%d.%d C", s ? s : "", temp>>8, (temp & 255)*10/256 ); |
| 110 | } |
| 111 | |
| 112 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 113 | show_cpu_temperature( struct device *dev, struct device_attribute *attr, char *buf ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | return sprintf(buf, "%d.%d\n", x.temp>>8, (x.temp & 255)*10/256 ); |
| 116 | } |
| 117 | |
| 118 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 119 | show_case_temperature( struct device *dev, struct device_attribute *attr, char *buf ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
| 121 | return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 ); |
| 122 | } |
| 123 | |
| 124 | static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL ); |
| 125 | static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL ); |
| 126 | |
| 127 | |
| 128 | |
| 129 | /************************************************************************/ |
| 130 | /* controller thread */ |
| 131 | /************************************************************************/ |
| 132 | |
| 133 | static int |
| 134 | write_reg( struct i2c_client *cl, int reg, int data, int len ) |
| 135 | { |
| 136 | u8 tmp[3]; |
| 137 | |
| 138 | if( len < 1 || len > 2 || data < 0 ) |
| 139 | return -EINVAL; |
| 140 | |
| 141 | tmp[0] = reg; |
| 142 | tmp[1] = (len == 1) ? data : (data >> 8); |
| 143 | tmp[2] = data; |
| 144 | len++; |
| 145 | |
| 146 | if( i2c_master_send(cl, tmp, len) != len ) |
| 147 | return -ENODEV; |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static int |
| 152 | read_reg( struct i2c_client *cl, int reg, int len ) |
| 153 | { |
| 154 | u8 buf[2]; |
| 155 | |
| 156 | if( len != 1 && len != 2 ) |
| 157 | return -EINVAL; |
| 158 | buf[0] = reg; |
| 159 | if( i2c_master_send(cl, buf, 1) != 1 ) |
| 160 | return -ENODEV; |
| 161 | if( i2c_master_recv(cl, buf, len) != len ) |
| 162 | return -ENODEV; |
| 163 | return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0]; |
| 164 | } |
| 165 | |
| 166 | static void |
| 167 | tune_fan( int fan_setting ) |
| 168 | { |
| 169 | int val = (fan_setting << 3) | 7; |
| 170 | |
| 171 | /* write_reg( x.fan, 0x24, val, 1 ); */ |
| 172 | write_reg( x.fan, 0x25, val, 1 ); |
| 173 | write_reg( x.fan, 0x20, 0, 1 ); |
| 174 | print_temp("CPU-temp: ", x.temp ); |
| 175 | if( x.casetemp ) |
| 176 | print_temp(", Case: ", x.casetemp ); |
| 177 | printk(", Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting ); |
| 178 | |
| 179 | x.fan_level = fan_setting; |
| 180 | } |
| 181 | |
| 182 | static void |
| 183 | poll_temp( void ) |
| 184 | { |
| 185 | int temp, i, level, casetemp; |
| 186 | |
| 187 | temp = read_reg( x.thermostat, 0, 2 ); |
| 188 | |
| 189 | /* this actually occurs when the computer is loaded */ |
| 190 | if( temp < 0 ) |
| 191 | return; |
| 192 | |
| 193 | casetemp = read_reg(x.fan, 0x0b, 1) << 8; |
| 194 | casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5; |
| 195 | |
| 196 | if( LOG_TEMP && x.temp != temp ) { |
| 197 | print_temp("CPU-temp: ", temp ); |
| 198 | print_temp(", Case: ", casetemp ); |
| 199 | printk(", Fan: %d\n", 11-x.fan_level ); |
| 200 | } |
| 201 | x.temp = temp; |
| 202 | x.casetemp = casetemp; |
| 203 | |
| 204 | level = -1; |
| 205 | for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ ) |
| 206 | ; |
| 207 | if( i < x.downind ) |
| 208 | level = fan_table[i].fan_down_setting; |
| 209 | x.downind = i; |
| 210 | |
| 211 | for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ ) |
| 212 | ; |
| 213 | if( x.upind < i ) |
| 214 | level = fan_table[i].fan_up_setting; |
| 215 | x.upind = i; |
| 216 | |
| 217 | if( level >= 0 ) |
| 218 | tune_fan( level ); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | static void |
| 223 | setup_hardware( void ) |
| 224 | { |
| 225 | int val; |
| 226 | |
| 227 | /* save registers (if we unload the module) */ |
| 228 | x.r0 = read_reg( x.fan, 0x00, 1 ); |
| 229 | x.r1 = read_reg( x.fan, 0x01, 1 ); |
| 230 | x.r20 = read_reg( x.fan, 0x20, 1 ); |
| 231 | x.r23 = read_reg( x.fan, 0x23, 1 ); |
| 232 | x.r25 = read_reg( x.fan, 0x25, 1 ); |
| 233 | |
| 234 | /* improve measurement resolution (convergence time 1.5s) */ |
| 235 | if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) { |
| 236 | val |= 0x60; |
| 237 | if( write_reg( x.thermostat, 1, val, 1 ) ) |
| 238 | printk("Failed writing config register\n"); |
| 239 | } |
| 240 | /* disable interrupts and TAC input */ |
| 241 | write_reg( x.fan, 0x01, 0x01, 1 ); |
| 242 | /* enable filter */ |
| 243 | write_reg( x.fan, 0x23, 0x91, 1 ); |
| 244 | /* remote temp. controls fan */ |
| 245 | write_reg( x.fan, 0x00, 0x95, 1 ); |
| 246 | |
| 247 | /* The thermostat (which besides measureing temperature controls |
| 248 | * has a THERM output which puts the fan on 100%) is usually |
| 249 | * set to kick in at 80 C (chip default). We reduce this a bit |
| 250 | * to be on the safe side (OSX doesn't)... |
| 251 | */ |
| 252 | if( x.overheat_temp == (80 << 8) ) { |
| 253 | x.overheat_temp = 65 << 8; |
| 254 | x.overheat_hyst = 60 << 8; |
| 255 | write_reg( x.thermostat, 2, x.overheat_hyst, 2 ); |
| 256 | write_reg( x.thermostat, 3, x.overheat_temp, 2 ); |
| 257 | |
| 258 | print_temp("Reducing overheating limit to ", x.overheat_temp ); |
| 259 | print_temp(" (Hyst: ", x.overheat_hyst ); |
| 260 | printk(")\n"); |
| 261 | } |
| 262 | |
| 263 | /* set an initial fan setting */ |
| 264 | x.downind = 0xffff; |
| 265 | x.upind = -1; |
| 266 | /* tune_fan( fan_up_table[x.upind].fan_setting ); */ |
| 267 | |
| 268 | device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); |
| 269 | device_create_file( &x.of_dev->dev, &dev_attr_case_temperature ); |
| 270 | } |
| 271 | |
| 272 | static void |
| 273 | restore_regs( void ) |
| 274 | { |
| 275 | device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature ); |
| 276 | device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature ); |
| 277 | |
| 278 | write_reg( x.fan, 0x01, x.r1, 1 ); |
| 279 | write_reg( x.fan, 0x20, x.r20, 1 ); |
| 280 | write_reg( x.fan, 0x23, x.r23, 1 ); |
| 281 | write_reg( x.fan, 0x25, x.r25, 1 ); |
| 282 | write_reg( x.fan, 0x00, x.r0, 1 ); |
| 283 | } |
| 284 | |
| 285 | static int |
| 286 | control_loop( void *dummy ) |
| 287 | { |
| 288 | daemonize("g4fand"); |
| 289 | |
| 290 | down( &x.lock ); |
| 291 | setup_hardware(); |
| 292 | |
| 293 | while( x.running ) { |
| 294 | up( &x.lock ); |
| 295 | |
| 296 | msleep_interruptible(8000); |
| 297 | |
| 298 | down( &x.lock ); |
| 299 | poll_temp(); |
| 300 | } |
| 301 | |
| 302 | restore_regs(); |
| 303 | up( &x.lock ); |
| 304 | |
| 305 | complete_and_exit( &x.completion, 0 ); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | /************************************************************************/ |
| 310 | /* i2c probing and setup */ |
| 311 | /************************************************************************/ |
| 312 | |
| 313 | static int |
| 314 | do_attach( struct i2c_adapter *adapter ) |
| 315 | { |
| 316 | int ret = 0; |
| 317 | |
| 318 | if( strncmp(adapter->name, "uni-n", 5) ) |
| 319 | return 0; |
| 320 | |
| 321 | if( !x.running ) { |
| 322 | ret = i2c_probe( adapter, &addr_data, &do_probe ); |
| 323 | if( x.thermostat && x.fan ) { |
| 324 | x.running = 1; |
| 325 | init_completion( &x.completion ); |
| 326 | x.poll_task = kernel_thread( control_loop, NULL, SIGCHLD | CLONE_KERNEL ); |
| 327 | } |
| 328 | } |
| 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | do_detach( struct i2c_client *client ) |
| 334 | { |
| 335 | int err; |
| 336 | |
| 337 | if( (err=i2c_detach_client(client)) ) |
| 338 | printk(KERN_ERR "failed to detach thermostat client\n"); |
| 339 | else { |
| 340 | if( x.running ) { |
| 341 | x.running = 0; |
| 342 | wait_for_completion( &x.completion ); |
| 343 | } |
| 344 | if( client == x.thermostat ) |
| 345 | x.thermostat = NULL; |
| 346 | else if( client == x.fan ) |
| 347 | x.fan = NULL; |
| 348 | else { |
| 349 | printk(KERN_ERR "g4fan: bad client\n"); |
| 350 | } |
| 351 | kfree( client ); |
| 352 | } |
| 353 | return err; |
| 354 | } |
| 355 | |
| 356 | static struct i2c_driver g4fan_driver = { |
Laurent Riffard | a33ca23 | 2005-11-26 20:40:34 +0100 | [diff] [blame] | 357 | .driver = { |
Laurent Riffard | a33ca23 | 2005-11-26 20:40:34 +0100 | [diff] [blame] | 358 | .name = "therm_windtunnel", |
| 359 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | .id = I2C_DRIVERID_G4FAN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | .attach_adapter = do_attach, |
| 362 | .detach_client = do_detach, |
| 363 | }; |
| 364 | |
| 365 | static int |
| 366 | attach_fan( struct i2c_client *cl ) |
| 367 | { |
| 368 | if( x.fan ) |
| 369 | goto out; |
| 370 | |
| 371 | /* check that this is an ADM1030 */ |
| 372 | if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 ) |
| 373 | goto out; |
| 374 | printk("ADM1030 fan controller [@%02x]\n", cl->addr ); |
| 375 | |
| 376 | strlcpy( cl->name, "ADM1030 fan controller", sizeof(cl->name) ); |
| 377 | |
| 378 | if( !i2c_attach_client(cl) ) |
| 379 | x.fan = cl; |
| 380 | out: |
| 381 | if( cl != x.fan ) |
| 382 | kfree( cl ); |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static int |
| 387 | attach_thermostat( struct i2c_client *cl ) |
| 388 | { |
| 389 | int hyst_temp, os_temp, temp; |
| 390 | |
| 391 | if( x.thermostat ) |
| 392 | goto out; |
| 393 | |
| 394 | if( (temp=read_reg(cl, 0, 2)) < 0 ) |
| 395 | goto out; |
| 396 | |
| 397 | /* temperature sanity check */ |
| 398 | if( temp < 0x1600 || temp > 0x3c00 ) |
| 399 | goto out; |
| 400 | hyst_temp = read_reg(cl, 2, 2); |
| 401 | os_temp = read_reg(cl, 3, 2); |
| 402 | if( hyst_temp < 0 || os_temp < 0 ) |
| 403 | goto out; |
| 404 | |
| 405 | printk("DS1775 digital thermometer [@%02x]\n", cl->addr ); |
| 406 | print_temp("Temp: ", temp ); |
| 407 | print_temp(" Hyst: ", hyst_temp ); |
| 408 | print_temp(" OS: ", os_temp ); |
| 409 | printk("\n"); |
| 410 | |
| 411 | x.temp = temp; |
| 412 | x.overheat_temp = os_temp; |
| 413 | x.overheat_hyst = hyst_temp; |
| 414 | |
| 415 | strlcpy( cl->name, "DS1775 thermostat", sizeof(cl->name) ); |
| 416 | |
| 417 | if( !i2c_attach_client(cl) ) |
| 418 | x.thermostat = cl; |
| 419 | out: |
| 420 | if( cl != x.thermostat ) |
| 421 | kfree( cl ); |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static int |
| 426 | do_probe( struct i2c_adapter *adapter, int addr, int kind ) |
| 427 | { |
| 428 | struct i2c_client *cl; |
| 429 | |
| 430 | if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA |
| 431 | | I2C_FUNC_SMBUS_WRITE_BYTE) ) |
| 432 | return 0; |
| 433 | |
| 434 | if( !(cl=kmalloc(sizeof(*cl), GFP_KERNEL)) ) |
| 435 | return -ENOMEM; |
| 436 | memset( cl, 0, sizeof(struct i2c_client) ); |
| 437 | |
| 438 | cl->addr = addr; |
| 439 | cl->adapter = adapter; |
| 440 | cl->driver = &g4fan_driver; |
| 441 | cl->flags = 0; |
| 442 | |
| 443 | if( addr < 0x48 ) |
| 444 | return attach_fan( cl ); |
| 445 | return attach_thermostat( cl ); |
| 446 | } |
| 447 | |
| 448 | |
| 449 | /************************************************************************/ |
| 450 | /* initialization / cleanup */ |
| 451 | /************************************************************************/ |
| 452 | |
| 453 | static int |
Jeff Mahoney | 5e65577 | 2005-07-06 15:44:41 -0400 | [diff] [blame] | 454 | therm_of_probe( struct of_device *dev, const struct of_device_id *match ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | { |
| 456 | return i2c_add_driver( &g4fan_driver ); |
| 457 | } |
| 458 | |
| 459 | static int |
| 460 | therm_of_remove( struct of_device *dev ) |
| 461 | { |
| 462 | return i2c_del_driver( &g4fan_driver ); |
| 463 | } |
| 464 | |
Jeff Mahoney | 5e65577 | 2005-07-06 15:44:41 -0400 | [diff] [blame] | 465 | static struct of_device_id therm_of_match[] = {{ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | .name = "fan", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | .compatible = "adm1030" |
| 468 | }, {} |
| 469 | }; |
| 470 | |
| 471 | static struct of_platform_driver therm_of_driver = { |
| 472 | .name = "temperature", |
| 473 | .match_table = therm_of_match, |
| 474 | .probe = therm_of_probe, |
| 475 | .remove = therm_of_remove, |
| 476 | }; |
| 477 | |
| 478 | struct apple_thermal_info { |
| 479 | u8 id; /* implementation ID */ |
| 480 | u8 fan_count; /* number of fans */ |
| 481 | u8 thermostat_count; /* number of thermostats */ |
| 482 | u8 unused; |
| 483 | }; |
| 484 | |
| 485 | static int __init |
| 486 | g4fan_init( void ) |
| 487 | { |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 488 | const struct apple_thermal_info *info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | struct device_node *np; |
| 490 | |
| 491 | init_MUTEX( &x.lock ); |
| 492 | |
| 493 | if( !(np=of_find_node_by_name(NULL, "power-mgt")) ) |
| 494 | return -ENODEV; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 495 | info = get_property(np, "thermal-info", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | of_node_put(np); |
| 497 | |
| 498 | if( !info || !machine_is_compatible("PowerMac3,6") ) |
| 499 | return -ENODEV; |
| 500 | |
| 501 | if( info->id != 3 ) { |
| 502 | printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id ); |
| 503 | return -ENODEV; |
| 504 | } |
| 505 | if( !(np=of_find_node_by_name(NULL, "fan")) ) |
| 506 | return -ENODEV; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 507 | x.of_dev = of_platform_device_create(np, "temperature", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | of_node_put( np ); |
| 509 | |
| 510 | if( !x.of_dev ) { |
| 511 | printk(KERN_ERR "Can't register fan controller!\n"); |
| 512 | return -ENODEV; |
| 513 | } |
| 514 | |
Benjamin Herrenschmidt | 7eebde7 | 2006-11-11 17:24:59 +1100 | [diff] [blame] | 515 | of_register_platform_driver( &therm_of_driver ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | static void __exit |
| 520 | g4fan_exit( void ) |
| 521 | { |
Benjamin Herrenschmidt | 7eebde7 | 2006-11-11 17:24:59 +1100 | [diff] [blame] | 522 | of_unregister_platform_driver( &therm_of_driver ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
| 524 | if( x.of_dev ) |
| 525 | of_device_unregister( x.of_dev ); |
| 526 | } |
| 527 | |
| 528 | module_init(g4fan_init); |
| 529 | module_exit(g4fan_exit); |
| 530 | |
| 531 | MODULE_AUTHOR("Samuel Rydh <samuel@ibrium.se>"); |
| 532 | MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller"); |
| 533 | MODULE_LICENSE("GPL"); |