lm78.c 27.0 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4
/*
    lm78.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> 
J
Jean Delvare 已提交
5
    Copyright (c) 2007        Jean Delvare <khali@linux-fr.org>
L
Linus Torvalds 已提交
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
J
Jean Delvare 已提交
27 28
#include <linux/platform_device.h>
#include <linux/ioport.h>
29
#include <linux/hwmon.h>
30
#include <linux/hwmon-vid.h>
31
#include <linux/hwmon-sysfs.h>
32
#include <linux/err.h>
33
#include <linux/mutex.h>
L
Linus Torvalds 已提交
34 35
#include <asm/io.h>

J
Jean Delvare 已提交
36 37 38
/* ISA device, if found */
static struct platform_device *pdev;

L
Linus Torvalds 已提交
39 40 41 42 43
/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
					0x25, 0x26, 0x27, 0x28, 0x29,
					0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
					0x2f, I2C_CLIENT_END };
44
static unsigned short isa_address = 0x290;
L
Linus Torvalds 已提交
45 46

/* Insmod parameters */
47
I2C_CLIENT_INSMOD_2(lm78, lm79);
L
Linus Torvalds 已提交
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129

/* Many LM78 constants specified below */

/* Length of ISA address segment */
#define LM78_EXTENT 8

/* Where are the ISA address/data registers relative to the base address */
#define LM78_ADDR_REG_OFFSET 5
#define LM78_DATA_REG_OFFSET 6

/* The LM78 registers */
#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
#define LM78_REG_IN(nr) (0x20 + (nr))

#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
#define LM78_REG_FAN(nr) (0x28 + (nr))

#define LM78_REG_TEMP 0x27
#define LM78_REG_TEMP_OVER 0x39
#define LM78_REG_TEMP_HYST 0x3a

#define LM78_REG_ALARM1 0x41
#define LM78_REG_ALARM2 0x42

#define LM78_REG_VID_FANDIV 0x47

#define LM78_REG_CONFIG 0x40
#define LM78_REG_CHIPID 0x49
#define LM78_REG_I2C_ADDR 0x48


/* Conversions. Rounding and limit checking is only done on the TO_REG 
   variants. */

/* IN: mV, (0V to 4.08V)
   REG: 16mV/bit */
static inline u8 IN_TO_REG(unsigned long val)
{
	unsigned long nval = SENSORS_LIMIT(val, 0, 4080);
	return (nval + 8) / 16;
}
#define IN_FROM_REG(val) ((val) *  16)

static inline u8 FAN_TO_REG(long rpm, int div)
{
	if (rpm <= 0)
		return 255;
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

static inline int FAN_FROM_REG(u8 val, int div)
{
	return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div);
}

/* TEMP: mC (-128C to +127C)
   REG: 1C/bit, two's complement */
static inline s8 TEMP_TO_REG(int val)
{
	int nval = SENSORS_LIMIT(val, -128000, 127000) ;
	return nval<0 ? (nval-500)/1000 : (nval+500)/1000;
}

static inline int TEMP_FROM_REG(s8 val)
{
	return val * 1000;
}

#define DIV_FROM_REG(val) (1 << (val))

/* There are some complications in a module like this. First off, LM78 chips
   may be both present on the SMBus and the ISA bus, and we have to handle
   those cases separately at some places. Second, there might be several
   LM78 chips available (well, actually, that is probably never done; but
   it is a clean illustration of how to handle a case like that). Finally,
   a specific chip may be attached to *both* ISA and SMBus, and we would
   not like to detect it double. Fortunately, in the case of the LM78 at
   least, a register tells us what SMBus address we are on, so that helps
   a bit - except if there could be more than one SMBus. Groan. No solution
   for this yet. */

J
Jean Delvare 已提交
130 131
/* For ISA chips, we abuse the i2c_client addr and name fields. We also use
   the driver field to differentiate between I2C and ISA chips. */
L
Linus Torvalds 已提交
132 133
struct lm78_data {
	struct i2c_client client;
134
	struct class_device *class_dev;
135
	struct mutex lock;
L
Linus Torvalds 已提交
136 137
	enum chips type;

138
	struct mutex update_lock;
L
Linus Torvalds 已提交
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u8 in[7];		/* Register value */
	u8 in_max[7];		/* Register value */
	u8 in_min[7];		/* Register value */
	u8 fan[3];		/* Register value */
	u8 fan_min[3];		/* Register value */
	s8 temp;		/* Register value */
	s8 temp_over;		/* Register value */
	s8 temp_hyst;		/* Register value */
	u8 fan_div[3];		/* Register encoding, shifted right */
	u8 vid;			/* Register encoding, combined */
	u16 alarms;		/* Register encoding, combined */
};


static int lm78_attach_adapter(struct i2c_adapter *adapter);
static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm78_detach_client(struct i2c_client *client);

J
Jean Delvare 已提交
160 161 162
static int __devinit lm78_isa_probe(struct platform_device *pdev);
static int __devexit lm78_isa_remove(struct platform_device *pdev);

163 164
static int lm78_read_value(struct lm78_data *data, u8 reg);
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
L
Linus Torvalds 已提交
165
static struct lm78_data *lm78_update_device(struct device *dev);
166
static void lm78_init_device(struct lm78_data *data);
L
Linus Torvalds 已提交
167 168 169


static struct i2c_driver lm78_driver = {
170 171 172
	.driver = {
		.name	= "lm78",
	},
L
Linus Torvalds 已提交
173 174 175 176 177
	.id		= I2C_DRIVERID_LM78,
	.attach_adapter	= lm78_attach_adapter,
	.detach_client	= lm78_detach_client,
};

J
Jean Delvare 已提交
178
static struct platform_driver lm78_isa_driver = {
179
	.driver = {
J
Jean Delvare 已提交
180
		.owner	= THIS_MODULE,
J
Jean Delvare 已提交
181
		.name	= "lm78",
182
	},
J
Jean Delvare 已提交
183 184
	.probe		= lm78_isa_probe,
	.remove		= lm78_isa_remove,
185 186 187
};


L
Linus Torvalds 已提交
188
/* 7 Voltages */
189 190
static ssize_t show_in(struct device *dev, struct device_attribute *da,
		       char *buf)
L
Linus Torvalds 已提交
191
{
192
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
193
	struct lm78_data *data = lm78_update_device(dev);
194
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
L
Linus Torvalds 已提交
195 196
}

197 198
static ssize_t show_in_min(struct device *dev, struct device_attribute *da,
			   char *buf)
L
Linus Torvalds 已提交
199
{
200
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
201
	struct lm78_data *data = lm78_update_device(dev);
202
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
L
Linus Torvalds 已提交
203 204
}

205 206
static ssize_t show_in_max(struct device *dev, struct device_attribute *da,
			   char *buf)
L
Linus Torvalds 已提交
207
{
208
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
209
	struct lm78_data *data = lm78_update_device(dev);
210
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
L
Linus Torvalds 已提交
211 212
}

213 214
static ssize_t set_in_min(struct device *dev, struct device_attribute *da,
			  const char *buf, size_t count)
L
Linus Torvalds 已提交
215
{
216
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
J
Jean Delvare 已提交
217
	struct lm78_data *data = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
218
	unsigned long val = simple_strtoul(buf, NULL, 10);
219
	int nr = attr->index;
L
Linus Torvalds 已提交
220

221
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
222
	data->in_min[nr] = IN_TO_REG(val);
223
	lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
224
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
225 226 227
	return count;
}

228 229
static ssize_t set_in_max(struct device *dev, struct device_attribute *da,
			  const char *buf, size_t count)
L
Linus Torvalds 已提交
230
{
231
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
J
Jean Delvare 已提交
232
	struct lm78_data *data = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
233
	unsigned long val = simple_strtoul(buf, NULL, 10);
234
	int nr = attr->index;
L
Linus Torvalds 已提交
235

236
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
237
	data->in_max[nr] = IN_TO_REG(val);
238
	lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
239
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
240 241 242 243
	return count;
}
	
#define show_in_offset(offset)					\
244 245 246 247 248 249
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
		show_in, NULL, offset);				\
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
		show_in_min, set_in_min, offset);		\
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
		show_in_max, set_in_max, offset);
L
Linus Torvalds 已提交
250 251 252 253 254 255 256 257 258 259

show_in_offset(0);
show_in_offset(1);
show_in_offset(2);
show_in_offset(3);
show_in_offset(4);
show_in_offset(5);
show_in_offset(6);

/* Temperature */
260 261
static ssize_t show_temp(struct device *dev, struct device_attribute *da,
			 char *buf)
L
Linus Torvalds 已提交
262 263 264 265 266
{
	struct lm78_data *data = lm78_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
}

267 268
static ssize_t show_temp_over(struct device *dev, struct device_attribute *da,
			      char *buf)
L
Linus Torvalds 已提交
269 270 271 272 273
{
	struct lm78_data *data = lm78_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
}

274 275
static ssize_t set_temp_over(struct device *dev, struct device_attribute *da,
			     const char *buf, size_t count)
L
Linus Torvalds 已提交
276
{
J
Jean Delvare 已提交
277
	struct lm78_data *data = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
278 279
	long val = simple_strtol(buf, NULL, 10);

280
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
281
	data->temp_over = TEMP_TO_REG(val);
282
	lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
283
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
284 285 286
	return count;
}

287 288
static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da,
			      char *buf)
L
Linus Torvalds 已提交
289 290 291 292 293
{
	struct lm78_data *data = lm78_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
}

294 295
static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da,
			     const char *buf, size_t count)
L
Linus Torvalds 已提交
296
{
J
Jean Delvare 已提交
297
	struct lm78_data *data = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
298 299
	long val = simple_strtol(buf, NULL, 10);

300
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
301
	data->temp_hyst = TEMP_TO_REG(val);
302
	lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
303
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
304 305 306 307 308 309 310 311 312 313
	return count;
}

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
		show_temp_over, set_temp_over);
static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
		show_temp_hyst, set_temp_hyst);

/* 3 Fans */
314 315
static ssize_t show_fan(struct device *dev, struct device_attribute *da,
			char *buf)
L
Linus Torvalds 已提交
316
{
317
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
318
	struct lm78_data *data = lm78_update_device(dev);
319
	int nr = attr->index;
L
Linus Torvalds 已提交
320 321 322 323
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
		DIV_FROM_REG(data->fan_div[nr])) );
}

324 325
static ssize_t show_fan_min(struct device *dev, struct device_attribute *da,
			    char *buf)
L
Linus Torvalds 已提交
326
{
327
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
328
	struct lm78_data *data = lm78_update_device(dev);
329
	int nr = attr->index;
L
Linus Torvalds 已提交
330 331 332 333
	return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr],
		DIV_FROM_REG(data->fan_div[nr])) );
}

334 335
static ssize_t set_fan_min(struct device *dev, struct device_attribute *da,
			   const char *buf, size_t count)
L
Linus Torvalds 已提交
336
{
337
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
J
Jean Delvare 已提交
338
	struct lm78_data *data = dev_get_drvdata(dev);
339
	int nr = attr->index;
L
Linus Torvalds 已提交
340 341
	unsigned long val = simple_strtoul(buf, NULL, 10);

342
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
343
	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
344
	lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
345
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
346 347 348
	return count;
}

349 350
static ssize_t show_fan_div(struct device *dev, struct device_attribute *da,
			    char *buf)
L
Linus Torvalds 已提交
351
{
352
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
L
Linus Torvalds 已提交
353
	struct lm78_data *data = lm78_update_device(dev);
354
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
L
Linus Torvalds 已提交
355 356 357 358
}

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan divisor.  This follows the principle of
A
Andreas Mohr 已提交
359
   least surprise; the user doesn't expect the fan minimum to change just
L
Linus Torvalds 已提交
360
   because the divisor changed. */
361 362
static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
			   const char *buf, size_t count)
L
Linus Torvalds 已提交
363
{
364
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
J
Jean Delvare 已提交
365
	struct lm78_data *data = dev_get_drvdata(dev);
366
	int nr = attr->index;
L
Linus Torvalds 已提交
367 368 369 370
	unsigned long val = simple_strtoul(buf, NULL, 10);
	unsigned long min;
	u8 reg;

371
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
372 373 374 375 376 377 378 379 380
	min = FAN_FROM_REG(data->fan_min[nr],
			   DIV_FROM_REG(data->fan_div[nr]));

	switch (val) {
	case 1: data->fan_div[nr] = 0; break;
	case 2: data->fan_div[nr] = 1; break;
	case 4: data->fan_div[nr] = 2; break;
	case 8: data->fan_div[nr] = 3; break;
	default:
J
Jean Delvare 已提交
381
		dev_err(dev, "fan_div value %ld not "
L
Linus Torvalds 已提交
382
			"supported. Choose one of 1, 2, 4 or 8!\n", val);
383
		mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
384 385 386
		return -EINVAL;
	}

387
	reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
L
Linus Torvalds 已提交
388 389 390 391 392 393 394 395
	switch (nr) {
	case 0:
		reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
		break;
	case 1:
		reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
		break;
	}
396
	lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
L
Linus Torvalds 已提交
397 398 399

	data->fan_min[nr] =
		FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
400
	lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
401
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
402 403 404 405

	return count;
}

406 407 408 409 410
#define show_fan_offset(offset)				\
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,		\
		show_fan, NULL, offset - 1);			\
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,	\
		show_fan_min, set_fan_min, offset - 1);
L
Linus Torvalds 已提交
411 412 413 414 415 416

show_fan_offset(1);
show_fan_offset(2);
show_fan_offset(3);

/* Fan 3 divisor is locked in H/W */
417 418 419 420 421
static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
		show_fan_div, set_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
		show_fan_div, set_fan_div, 1);
static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2);
L
Linus Torvalds 已提交
422 423

/* VID */
424 425
static ssize_t show_vid(struct device *dev, struct device_attribute *da,
			char *buf)
L
Linus Torvalds 已提交
426 427
{
	struct lm78_data *data = lm78_update_device(dev);
428
	return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
L
Linus Torvalds 已提交
429 430 431 432
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

/* Alarms */
433 434
static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
			   char *buf)
L
Linus Torvalds 已提交
435 436 437 438 439 440 441 442 443 444 445 446 447 448
{
	struct lm78_data *data = lm78_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/* This function is called when:
     * lm78_driver is inserted (when this module is loaded), for each
       available adapter
     * when a new adapter is inserted (and lm78_driver is still present) */
static int lm78_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
449
	return i2c_probe(adapter, &addr_data, lm78_detect);
L
Linus Torvalds 已提交
450 451
}

452
static struct attribute *lm78_attributes[] = {
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
474 475 476
	&dev_attr_temp1_input.attr,
	&dev_attr_temp1_max.attr,
	&dev_attr_temp1_max_hyst.attr,
477 478 479 480 481 482 483 484 485
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan3_min.dev_attr.attr,
	&sensor_dev_attr_fan3_div.dev_attr.attr,
486 487 488 489 490 491 492 493 494 495
	&dev_attr_alarms.attr,
	&dev_attr_cpu0_vid.attr,

	NULL
};

static const struct attribute_group lm78_group = {
	.attrs = lm78_attributes,
};

J
Jean Delvare 已提交
496 497 498 499 500 501 502 503 504 505 506
/* I2C devices get this name attribute automatically, but for ISA devices
   we must create it by ourselves. */
static ssize_t show_name(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct lm78_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->client.name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

507
/* This function is called by i2c_probe */
508
static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
L
Linus Torvalds 已提交
509 510 511 512 513 514
{
	int i, err;
	struct i2c_client *new_client;
	struct lm78_data *data;
	const char *client_name = "";

J
Jean Delvare 已提交
515
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
L
Linus Torvalds 已提交
516
		err = -ENODEV;
J
Jean Delvare 已提交
517
		goto ERROR1;
L
Linus Torvalds 已提交
518 519 520 521 522 523
	}

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access lm78_{read,write}_value. */

D
Deepak Saxena 已提交
524
	if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
L
Linus Torvalds 已提交
525 526 527 528 529 530 531 532
		err = -ENOMEM;
		goto ERROR1;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
J
Jean Delvare 已提交
533
	new_client->driver = &lm78_driver;
L
Linus Torvalds 已提交
534 535 536

	/* Now, we do the remaining detection. */
	if (kind < 0) {
537
		if (lm78_read_value(data, LM78_REG_CONFIG) & 0x80) {
L
Linus Torvalds 已提交
538 539 540
			err = -ENODEV;
			goto ERROR2;
		}
541
		if (lm78_read_value(data, LM78_REG_I2C_ADDR) !=
J
Jean Delvare 已提交
542
		    address) {
L
Linus Torvalds 已提交
543 544 545 546 547 548 549
			err = -ENODEV;
			goto ERROR2;
		}
	}

	/* Determine the chip type. */
	if (kind <= 0) {
550
		i = lm78_read_value(data, LM78_REG_CHIPID);
551 552
		if (i == 0x00 || i == 0x20	/* LM78 */
		 || i == 0x40)			/* LM78-J */
L
Linus Torvalds 已提交
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
			kind = lm78;
		else if ((i & 0xfe) == 0xc0)
			kind = lm79;
		else {
			if (kind == 0)
				dev_warn(&adapter->dev, "Ignoring 'force' "
					"parameter for unknown chip at "
					"adapter %d, address 0x%02x\n",
					i2c_adapter_id(adapter), address);
			err = -ENODEV;
			goto ERROR2;
		}
	}

	if (kind == lm78) {
		client_name = "lm78";
	} else if (kind == lm79) {
		client_name = "lm79";
	}

	/* Fill in the remaining client fields and put into the global list */
	strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
	data->type = kind;

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto ERROR2;

	/* Initialize the LM78 chip */
582
	lm78_init_device(data);
L
Linus Torvalds 已提交
583 584

	/* Register sysfs hooks */
585 586 587
	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group)))
		goto ERROR3;

588 589 590
	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
591
		goto ERROR4;
592 593
	}

L
Linus Torvalds 已提交
594 595
	return 0;

596 597
ERROR4:
	sysfs_remove_group(&new_client->dev.kobj, &lm78_group);
598 599
ERROR3:
	i2c_detach_client(new_client);
L
Linus Torvalds 已提交
600 601 602 603 604 605 606 607
ERROR2:
	kfree(data);
ERROR1:
	return err;
}

static int lm78_detach_client(struct i2c_client *client)
{
608
	struct lm78_data *data = i2c_get_clientdata(client);
L
Linus Torvalds 已提交
609 610
	int err;

611
	hwmon_device_unregister(data->class_dev);
612
	sysfs_remove_group(&client->dev.kobj, &lm78_group);
613

614
	if ((err = i2c_detach_client(client)))
L
Linus Torvalds 已提交
615 616
		return err;

J
Jean Delvare 已提交
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644
	kfree(data);

	return 0;
}

static int __devinit lm78_isa_probe(struct platform_device *pdev)
{
	int err;
	struct lm78_data *data;
	struct resource *res;
	const char *name;

	/* Reserve the ISA region */
	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!request_region(res->start, LM78_EXTENT, "lm78")) {
		err = -EBUSY;
		goto exit;
	}

	if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit_release_region;
	}
	mutex_init(&data->lock);
	data->client.addr = res->start;
	i2c_set_clientdata(&data->client, data);
	platform_set_drvdata(pdev, data);

645
	if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
J
Jean Delvare 已提交
646 647 648 649 650 651 652 653 654
		data->type = lm79;
		name = "lm79";
	} else {
		data->type = lm78;
		name = "lm78";
	}
	strlcpy(data->client.name, name, I2C_NAME_SIZE);

	/* Initialize the LM78 chip */
655
	lm78_init_device(data);
J
Jean Delvare 已提交
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group))
	 || (err = device_create_file(&pdev->dev, &dev_attr_name)))
		goto exit_remove_files;

	data->class_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_remove_files;
	}

	return 0;

 exit_remove_files:
	sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
	device_remove_file(&pdev->dev, &dev_attr_name);
	kfree(data);
 exit_release_region:
	release_region(res->start, LM78_EXTENT);
 exit:
	return err;
}

static int __devexit lm78_isa_remove(struct platform_device *pdev)
{
	struct lm78_data *data = platform_get_drvdata(pdev);
L
Linus Torvalds 已提交
683

J
Jean Delvare 已提交
684 685 686 687
	hwmon_device_unregister(data->class_dev);
	sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
	device_remove_file(&pdev->dev, &dev_attr_name);
	release_region(data->client.addr, LM78_EXTENT);
688
	kfree(data);
L
Linus Torvalds 已提交
689 690 691 692

	return 0;
}

693
/* The SMBus locks itself, but ISA access must be locked explicitly! 
L
Linus Torvalds 已提交
694 695 696 697
   We don't want to lock the whole ISA bus, so we lock each client
   separately.
   We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
   would slow down the LM78 access and should not be necessary.  */
698
static int lm78_read_value(struct lm78_data *data, u8 reg)
L
Linus Torvalds 已提交
699
{
700 701
	struct i2c_client *client = &data->client;

J
Jean Delvare 已提交
702
	if (!client->driver) { /* ISA device */
703
		int res;
704
		mutex_lock(&data->lock);
L
Linus Torvalds 已提交
705 706
		outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
		res = inb_p(client->addr + LM78_DATA_REG_OFFSET);
707
		mutex_unlock(&data->lock);
L
Linus Torvalds 已提交
708 709 710 711 712
		return res;
	} else
		return i2c_smbus_read_byte_data(client, reg);
}

713
/* The SMBus locks itself, but ISA access muse be locked explicitly! 
L
Linus Torvalds 已提交
714 715 716 717 718 719
   We don't want to lock the whole ISA bus, so we lock each client
   separately.
   We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
   would slow down the LM78 access and should not be necessary. 
   There are some ugly typecasts here, but the good new is - they should
   nowhere else be necessary! */
720
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
L
Linus Torvalds 已提交
721
{
722 723
	struct i2c_client *client = &data->client;

J
Jean Delvare 已提交
724
	if (!client->driver) { /* ISA device */
725
		mutex_lock(&data->lock);
L
Linus Torvalds 已提交
726 727
		outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
		outb_p(value, client->addr + LM78_DATA_REG_OFFSET);
728
		mutex_unlock(&data->lock);
L
Linus Torvalds 已提交
729 730 731 732 733
		return 0;
	} else
		return i2c_smbus_write_byte_data(client, reg, value);
}

734
static void lm78_init_device(struct lm78_data *data)
L
Linus Torvalds 已提交
735
{
J
Jean Delvare 已提交
736 737
	u8 config;
	int i;
L
Linus Torvalds 已提交
738 739

	/* Start monitoring */
740
	config = lm78_read_value(data, LM78_REG_CONFIG);
J
Jean Delvare 已提交
741
	if ((config & 0x09) != 0x01)
742
		lm78_write_value(data, LM78_REG_CONFIG,
L
Linus Torvalds 已提交
743
				 (config & 0xf7) | 0x01);
J
Jean Delvare 已提交
744 745 746

	/* A few vars need to be filled upon startup */
	for (i = 0; i < 3; i++) {
747
		data->fan_min[i] = lm78_read_value(data,
J
Jean Delvare 已提交
748 749 750 751
					LM78_REG_FAN_MIN(i));
	}

	mutex_init(&data->update_lock);
L
Linus Torvalds 已提交
752 753 754 755
}

static struct lm78_data *lm78_update_device(struct device *dev)
{
J
Jean Delvare 已提交
756
	struct lm78_data *data = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
757 758
	int i;

759
	mutex_lock(&data->update_lock);
L
Linus Torvalds 已提交
760 761 762 763

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {

J
Jean Delvare 已提交
764
		dev_dbg(dev, "Starting lm78 update\n");
L
Linus Torvalds 已提交
765 766 767

		for (i = 0; i <= 6; i++) {
			data->in[i] =
768
			    lm78_read_value(data, LM78_REG_IN(i));
L
Linus Torvalds 已提交
769
			data->in_min[i] =
770
			    lm78_read_value(data, LM78_REG_IN_MIN(i));
L
Linus Torvalds 已提交
771
			data->in_max[i] =
772
			    lm78_read_value(data, LM78_REG_IN_MAX(i));
L
Linus Torvalds 已提交
773 774 775
		}
		for (i = 0; i < 3; i++) {
			data->fan[i] =
776
			    lm78_read_value(data, LM78_REG_FAN(i));
L
Linus Torvalds 已提交
777
			data->fan_min[i] =
778
			    lm78_read_value(data, LM78_REG_FAN_MIN(i));
L
Linus Torvalds 已提交
779
		}
780
		data->temp = lm78_read_value(data, LM78_REG_TEMP);
L
Linus Torvalds 已提交
781
		data->temp_over =
782
		    lm78_read_value(data, LM78_REG_TEMP_OVER);
L
Linus Torvalds 已提交
783
		data->temp_hyst =
784 785
		    lm78_read_value(data, LM78_REG_TEMP_HYST);
		i = lm78_read_value(data, LM78_REG_VID_FANDIV);
L
Linus Torvalds 已提交
786 787 788
		data->vid = i & 0x0f;
		if (data->type == lm79)
			data->vid |=
789
			    (lm78_read_value(data, LM78_REG_CHIPID) &
L
Linus Torvalds 已提交
790 791 792 793 794
			     0x01) << 4;
		else
			data->vid |= 0x10;
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = i >> 6;
795 796
		data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
		    (lm78_read_value(data, LM78_REG_ALARM2) << 8);
L
Linus Torvalds 已提交
797 798 799 800 801 802
		data->last_updated = jiffies;
		data->valid = 1;

		data->fan_div[2] = 1;
	}

803
	mutex_unlock(&data->update_lock);
L
Linus Torvalds 已提交
804 805 806 807

	return data;
}

J
Jean Delvare 已提交
808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
/* return 1 if a supported chip is found, 0 otherwise */
static int __init lm78_isa_found(unsigned short address)
{
	int val, save, found = 0;

	if (!request_region(address, LM78_EXTENT, "lm78"))
		return 0;

#define REALLY_SLOW_IO
	/* We need the timeouts for at least some LM78-like
	   chips. But only if we read 'undefined' registers. */
	val = inb_p(address + 1);
	if (inb_p(address + 2) != val
	 || inb_p(address + 3) != val
	 || inb_p(address + 7) != val)
		goto release;
#undef REALLY_SLOW_IO

	/* We should be able to change the 7 LSB of the address port. The
	   MSB (busy flag) should be clear initially, set after the write. */
	save = inb_p(address + LM78_ADDR_REG_OFFSET);
	if (save & 0x80)
		goto release;
	val = ~save & 0x7f;
	outb_p(val, address + LM78_ADDR_REG_OFFSET);
	if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
		outb_p(save, address + LM78_ADDR_REG_OFFSET);
		goto release;
	}

	/* We found a device, now see if it could be an LM78 */
	outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
	val = inb_p(address + LM78_DATA_REG_OFFSET);
	if (val & 0x80)
		goto release;
	outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
	val = inb_p(address + LM78_DATA_REG_OFFSET);
	if (val < 0x03 || val > 0x77)	/* Not a valid I2C address */
		goto release;

	/* The busy flag should be clear again */
	if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
		goto release;

	/* Explicitly prevent the misdetection of Winbond chips */
	outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
	val = inb_p(address + LM78_DATA_REG_OFFSET);
	if (val == 0xa3 || val == 0x5c)
		goto release;

	/* Explicitly prevent the misdetection of ITE chips */
	outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
	val = inb_p(address + LM78_DATA_REG_OFFSET);
	if (val == 0x90)
		goto release;

	/* Determine the chip type */
	outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
	val = inb_p(address + LM78_DATA_REG_OFFSET);
867
	if (val == 0x00 || val == 0x20	/* LM78 */
J
Jean Delvare 已提交
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
	 || val == 0x40			/* LM78-J */
	 || (val & 0xfe) == 0xc0)	/* LM79 */
		found = 1;

	if (found)
		pr_info("lm78: Found an %s chip at %#x\n",
			val & 0x80 ? "LM79" : "LM78", (int)address);

 release:
	release_region(address, LM78_EXTENT);
	return found;
}

static int __init lm78_isa_device_add(unsigned short address)
{
	struct resource res = {
		.start	= address,
		.end	= address + LM78_EXTENT,
		.name	= "lm78",
		.flags	= IORESOURCE_IO,
	};
	int err;

	pdev = platform_device_alloc("lm78", address);
	if (!pdev) {
		err = -ENOMEM;
		printk(KERN_ERR "lm78: Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		printk(KERN_ERR "lm78: Device resource addition failed "
		       "(%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		printk(KERN_ERR "lm78: Device addition failed (%d)\n",
		       err);
		goto exit_device_put;
	}

	return 0;

 exit_device_put:
	platform_device_put(pdev);
 exit:
	pdev = NULL;
	return err;
}

L
Linus Torvalds 已提交
921 922
static int __init sm_lm78_init(void)
{
923 924 925 926
	int res;

	res = i2c_add_driver(&lm78_driver);
	if (res)
J
Jean Delvare 已提交
927 928 929 930 931 932
		goto exit;

	if (lm78_isa_found(isa_address)) {
		res = platform_driver_register(&lm78_isa_driver);
		if (res)
			goto exit_unreg_i2c_driver;
933

J
Jean Delvare 已提交
934 935 936 937 938
		/* Sets global pdev as a side effect */
		res = lm78_isa_device_add(isa_address);
		if (res)
			goto exit_unreg_isa_driver;
	}
939 940

	return 0;
J
Jean Delvare 已提交
941 942 943 944 945 946 947

 exit_unreg_isa_driver:
	platform_driver_unregister(&lm78_isa_driver);
 exit_unreg_i2c_driver:
	i2c_del_driver(&lm78_driver);
 exit:
	return res;
L
Linus Torvalds 已提交
948 949 950 951
}

static void __exit sm_lm78_exit(void)
{
J
Jean Delvare 已提交
952 953 954 955
	if (pdev) {
		platform_device_unregister(pdev);
		platform_driver_unregister(&lm78_isa_driver);
	}
L
Linus Torvalds 已提交
956 957 958 959 960 961
	i2c_del_driver(&lm78_driver);
}



MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
962
MODULE_DESCRIPTION("LM78/LM79 driver");
L
Linus Torvalds 已提交
963 964 965 966
MODULE_LICENSE("GPL");

module_init(sm_lm78_init);
module_exit(sm_lm78_exit);