3  *   Time-stamp: <2004/03/20 14:20:59 samuel>
7  *	The G4 "windtunnel" has a single fan controlled by an
8  *	ADM1030 fan controller and a DS1775 thermostat.
10  *	The fan controller is equipped with a temperature sensor
13  *	behavior of the fan. It is based upon empirical observations
58 	struct i2c_client	*fan;  member
60 	int			overheat_temp;		/* 100% fan at this temp */
79 	{ 11, T(0,0),  11 },	/* min fan */
89 	{  2, T(60,1), 2 },
90 	{  1, 0xfffff, 1 }	/* on fire */
125 	if( len < 1 || len > 2 || data < 0 )  in write_reg()
126 		return -EINVAL;  in write_reg()
129 	tmp[1] = (len == 1) ? data : (data >> 8);  in write_reg()
134 		return -ENODEV;  in write_reg()
143 	if( len != 1 && len != 2 )  in read_reg()
144 		return -EINVAL;  in read_reg()
146 	if( i2c_master_send(cl, buf, 1) != 1 )  in read_reg()
147 		return -ENODEV;  in read_reg()
149 		return -ENODEV;  in read_reg()
150 	return (len == 2)? ((unsigned int)buf[0] << 8) | buf[1] : buf[0];  in read_reg()
158 	/* write_reg( x.fan, 0x24, val, 1 ); */  in tune_fan()
159 	write_reg( x.fan, 0x25, val, 1 );  in tune_fan()
160 	write_reg( x.fan, 0x20, 0, 1 );  in tune_fan()
161 	print_temp("CPU-temp: ", x.temp );  in tune_fan()
164 	printk(",  Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );  in tune_fan()
180 	casetemp = read_reg(x.fan, 0x0b, 1) << 8;  in poll_temp()
181 	casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;  in poll_temp()
184 		print_temp("CPU-temp: ", temp );  in poll_temp()
186 		printk(",  Fan: %d\n", 11-x.fan_level );  in poll_temp()
191 	level = -1;  in poll_temp()
198 	for( i=0; (temp & 0xffff) >= fan_table[i+1].temp ; i++ )  in poll_temp()
216 	x.r0 = read_reg( x.fan, 0x00, 1 );  in setup_hardware()
217 	x.r1 = read_reg( x.fan, 0x01, 1 );  in setup_hardware()
218 	x.r20 = read_reg( x.fan, 0x20, 1 );  in setup_hardware()
219 	x.r23 = read_reg( x.fan, 0x23, 1 );  in setup_hardware()
220 	x.r25 = read_reg( x.fan, 0x25, 1 );  in setup_hardware()
223 	if( (val=read_reg(x.thermostat, 1, 1)) >= 0 ) {  in setup_hardware()
225 		if( write_reg( x.thermostat, 1, val, 1 ) )  in setup_hardware()
229 	write_reg( x.fan, 0x01, 0x01, 1 );  in setup_hardware()
231 	write_reg( x.fan, 0x23, 0x91, 1 );  in setup_hardware()
232 	/* remote temp. controls fan */  in setup_hardware()
233 	write_reg( x.fan, 0x00, 0x95, 1 );  in setup_hardware()
236 	 * has a THERM output which puts the fan on 100%) is usually  in setup_hardware()
251 	/* set an initial fan setting */  in setup_hardware()
253 	x.upind = -1;  in setup_hardware()
256 	err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );  in setup_hardware()
257 	err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );  in setup_hardware()
266 	device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );  in restore_regs()
267 	device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );  in restore_regs()
269 	write_reg( x.fan, 0x01, x.r1, 1 );  in restore_regs()
270 	write_reg( x.fan, 0x20, x.r20, 1 );  in restore_regs()
271 	write_reg( x.fan, 0x23, x.r23, 1 );  in restore_regs()
272 	write_reg( x.fan, 0x25, x.r25, 1 );  in restore_regs()
273 	write_reg( x.fan, 0x00, x.r0, 1 );  in restore_regs()
309 	/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */  in do_attach()
319 	if (x.running || strncmp(adapter->name, "uni-n", 5))  in do_attach()
322 	of_node_get(adapter->dev.of_node);  in do_attach()
323 	np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775");  in do_attach()
331 	of_node_get(adapter->dev.of_node);  in do_attach()
332 	np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030");  in do_attach()
351 	else if (client == x.fan)  in do_remove()
352 		x.fan = NULL;  in do_remove()
360 	if( x.fan )  in attach_fan()
364 	if( read_reg(cl, 0x3d, 1) != 0x30 || read_reg(cl, 0x3e, 1) != 0x41 )  in attach_fan()
366 	printk("ADM1030 fan controller [@%02x]\n", cl->addr );  in attach_fan()
368 	x.fan = cl;  in attach_fan()
392 	printk("DS1775 digital thermometer [@%02x]\n", cl->addr );  in attach_thermostat()
419 	struct i2c_adapter *adapter = cl->adapter;  in do_probe()
426 	switch (id->driver_data) {  in do_probe()
435 	if (!x.running && x.thermostat && x.fan) {  in do_probe()
436 		x.running = 1;  in do_probe()
464 		return -EPROBE_DEFER;  in therm_of_probe()
481 	return -ENODEV;  in therm_of_probe()
490 	.name		= "fan",
520 	if( !(np=of_find_node_by_name(NULL, "power-mgt")) )  in g4fan_init()
521 		return -ENODEV;  in g4fan_init()
522 	info = of_get_property(np, "thermal-info", NULL);  in g4fan_init()
526 		return -ENODEV;  in g4fan_init()
528 	if( info->id != 3 ) {  in g4fan_init()
529 		printk(KERN_ERR "therm_windtunnel: unsupported thermal design %d\n", info->id );  in g4fan_init()
530 		return -ENODEV;  in g4fan_init()
532 	if( !(np=of_find_node_by_name(NULL, "fan")) )  in g4fan_init()
533 		return -ENODEV;  in g4fan_init()
538 		printk(KERN_ERR "Can't register fan controller!\n");  in g4fan_init()
539 		return -ENODEV;  in g4fan_init()
552 		of_platform_device_destroy(&x.of_dev->dev, NULL);  in g4fan_exit()
559 MODULE_DESCRIPTION("Apple G4 (windtunnel) fan controller");